International Journal of Industrial and Systems Engineering (93 papers in press)
Stability Analysis of Asynchronous Switched Positive Systems with Unstable Subsystems
by Jingjing Hu, Pingping Gu, Huiwen Liu, Dexiang Liu
Abstract: This paper investigates the stability problems of asynchronous switched positive systems based on mode-dependent average dwell time method in continuous-time context. While using mode-dependent average dwell time to study the stability of switched systems, each subsystem must be stable, otherwise a state feedback controller should be designed for the unstable subsystem. But in practical application, when the subsystem is activated one by one, it usually takes a period of time to identify which one of the state feedback controllers should be activated, which causes the asynchronisation. Next, in consideration of the difficulty of designing an appropriate state feedback controller for some unstable subsystems, this paper is aimed at obtaining the stability condition of asynchronous switched positive systems with both stable and unstable subsystems.
Keywords: asynchronization; mode-dependent average dwell time; stabilization; switched positive systems; unstable subsystem.
Design and Development of Reactive Material Ordering System using E-Kanban and Taguchis Technique for a warehouse of Tractor Assembly Plant
by Mangesh Joshi, Himanshu Shukla
Abstract: In last one decade, information technology has proliferated in all sectors and it has become essential tool to survive in 21st century for all industries. In this endeavour, the efforts taken by authors to propose a virtual kanban system with the help of e-kanban database to react to the seasonal variations in demand. To react in stochastic conditions in JIT system, is a challenge, and hence a reactive ordering system is developed to operate the e-kanban system. The reactive ordering system consists of a simulation and Taguchi technique module to analyse the various parameters governing kanban system which can be changed to react to the variation in demand, in the database of e-kanban. Virtual e-kanban system can be established just by changing the parameters in database, governing the operation of kanban without physically changing the number of kanban cards on shop floor.
Keywords: Kanban; Simulation and Modeling; Reactive ordering; Taguchis technique; materials management.
Power Optimization of wind energy conversion system using T-S Fuzzy approach
by Sahbi Abderrahim
Abstract: This paper presents a maximum power point tracking control for a wind energy conversion system (WECS) using a squirrel cage induction generator (SCIG) which supplies a DC load through AC/DC converter. The goal of the developed fuzzy control law is to track the reference signals corresponding to the maximum power generation that leads to an optimal operation of the induction generator. First, the dynamics behaviour of the WECS is represented by a Takagi-Sugeno (T-S) fuzzy model. Then, a H? observer-based fuzzy controller is proposed to achieve a maximum power point tracking even when we consider a varying wind speed profile. The controller and observer gains are calculated by solving linear matrix inequalities (LMIs). Finally, simulation results are presented to illustrate the effectiveness of the proposed approach.
Keywords: Wind energy conversion system; fuzzy observer; AC/DC converter; Takagi-Sugeno model; linear matrix inequality (LMI).
An EPQ Model for an Imperfect Production System with Rework, Scrap, and Backorder
by Pablo Biswas, Scott R. Schultz
Abstract: This paper deals with an imperfect two-stage manufacturing process that orders raw materials from a supplier and produces finished goods with defective items that can be reworked. The generation of scrap during the initial production stage, during inspection, and during the rework stage is also considered. To fulfil customer demand a permissible backorder is also considered. First, an inventory model is developed for this two-stage production process with instantaneous raw material order, in-cycle rework, and scrap. Then, a total cost function is developed to simultaneously find the optimal economic production quantity, optimal backorder quantity, and optimal order quantity. The cost function of the proposed inventory model is verified and validated using numerical examples and sensitivity analysis.
Keywords: Imperfect production; defective items; rework; scrap; and backorder.
Selection of Resilient Supply Portfolio under Disruption Risks in Supply Chain
by Mohsen Shafiei Nikabadi, Hanieh Shambayati, Nasim Ataie
Abstract: Nowadays, dependence of supply chain members while has provided many benefits for organisations, increases uncertainty and risk in the planning and organising activities. The risk of disrupting or failing to communicate with the supplier due to various disasters has occurred in recent years. In this regard, this study introduces a model of mixed integer programming (MIP), to provide resiliency under the terms of a portfolios risk by minimising the disturbance conditional value at risk is optimised. Model, with two meta-heuristic algorithm and using real data is solved and compared. The results showed that the two algorithms do not differ significantly in the value of the objective function. Also the resolution time for the Harmony search algorithm was 8.87 seconds and the Imperialist competition algorithm was 8.28 seconds. According to the results, in general, the performance of the imperialist competition algorithm, although slightly less, is better than a harmony search algorithm.
Keywords: conditional value at risk; disruption risk; Harmony search Algorithm; Imperialist Competitive Algorithm; supply chain; supply portfolio; supplier selection; Resilience.
Optimal Design and Experiment of Multi-row Rolling-style Planting-hole Punch for Rapeseed Plant Seedlings
by Mingliang Wu, Wei Xiang, Jiangnan Lyu, Lan Ma, Jiajie Liu, Wei Zhou
Abstract: In order to realise high-efficiency hole-forming and pursue optimal forming hole parameters which satisfied agricultural requirements for awl-shaped punch transplanter, optimal designed indigenously-developed pure rolling planting hole-forming machine's hole forming mechanism parts. The CAD software was used to graphing method to study the effect of forming planting hole by structural parameters, the numerical simulation method by MATLAB 7.0 software and CATIA software were used to verify the rationality of the hole-forming key parameters optimisation design. Subsequently, prototype trial-production was carried out, followed by field testing. The results showed that forming planting hole opening lengthwise shrank form original 88.8 mm to 72.6 mm, lateral width was 41.2 mm, the effective depth reduced form 58.9 mm to 48.5 mm, qualified radio of forming planting hole reached to 95.1%, which 1.93% higher than the original prototype, which was significant for the provision of technical support for the design of new transplanter.
Keywords: rapeseed transplanting; planting hole; key components; hole forming mechanism; parameter optimization.
Optimum Design and Analysis of U-shape Thin-wall Aqueduct Based on Genetic Algorithm
by Wenliang Ma, Rui Yang
Abstract: In order to save project investment and reduce project quantity, the optimal design of aqueduct is the main problem in the project therefore, carrying out the optimal design and simulation analysis of U-shaped thin-walled aqueduct has important engineering application value. The paper takes Sha River aqueduct as the research object and adopts the direct search and point checking method of mixed discrete variable optimisation design it adopts the structural optimisation design method based on genetic algorithm and gives the optimal design scheme of U-shaped aqueduct. The optimisation design method has the advantages of fast convergence speed, high convergence efficiency and strong global search ability. The results show that, U-shape aqueduct structure is smooth, it has good mechanical properties, the structural stress is small and can meet the strength requirement; The maximum vertical displacement of the aqueduct occurs in the middle of the span, the vertical displacement value is small, which can meet the requirement of stiffness.
Keywords: Aqueduct; Optimization design; Discrete variable; Finite element method; Stress analysis; Vertical displacement.
Load shifting of a supplier based demand response of multi-class subscribers in smart grid
by Junxiang Li, Bo Liu, Quan Sun, Kamran Sarmadi, Yan Gao, Yazheng Dang, Jingxin Dong
Abstract: This paper presents a load shifting mechanism to address the problem of the overloaded electricity consumption requirement of different classes of electricity users, namely, the residential, commercial and industrial users, provided by a supplier in a smart grid. A real-time pricing model based the utility of each user-group and the supply cost is given and an alternating direction method of multipliers is used to solve the model for obtaining the optimal real-time electricity price and consumption of each user-group. A demand response (DR) algorithm-based different user-groups gives a priority load shifting rule to allocate the surplus optimal or reserved electricity consumption requirements of some user-groups to other suppliers to keep the requirements within the capacity of the supplier. Numerical experiment is conducted to analyse the performance of the DR algorithm, which shows that the consumption requirement load shifting mechanism is reasonable and feasible.
Keywords: demand response; multi-class subscribers; alternating direction method of multipliers; load shifting; smart grid.
Bi-objective Reliable Multi-Product Location-Inventory Problem Design with Perishable Products and Freshness-dependent Demands
by Parviz Fattahi, Mohsen Aghajani, Vahid Hajipour
Abstract: This paper tackles a bi-objective location-inventory problem (LIP) in a three-echelon multi-product supply chain with perishable products. Demands from customers are stochastic and freshness-dependent. Moreover, reliability issues are considered in terms of three different levels of failures for the distribution centres, namely disastrous, serious and partial. We also assess how well the customers' demands are met with products that are fresh enough and regard this as a reliability indicator from the viewpoint of customers. The problem is formulated as a mixed integer nonlinear programming (MINLP) model and six multi-objective decision-making (MODM) methods namely individual optimisation method, goal programming method, LP metrics/global criteria method, utility function method, goal attainment method, and maxi-min method are applied to solve test problems of different sizes. Finally, to select the best method, we used the filtering/displaced ideal solution (DIS) method where the goal programming method turned out to outperform other methods. Goal programming was then applied for sensitivity analysis of the problem.
Keywords: Location-inventory; reliability; freshness dependent demand; perishable products.
A Social Performance Metrics Framework for Sustainable Manufacturing
by Rafael Henao, William Sarache, Ivan Gomez
Abstract: Manufacturing companies are under constant pressure from stakeholders to achieve higher sustainability levels, especially in terms of environmental and social aspects. Although social performance is not a new topic in operations management, it is the least explored pillar of the triple bottom-line approach. Metrics for the assessment of social performance levels remain scarce, which limits those companies that are willing to involve them in decision-making processes. This situation can be attributed to the difficulty of finding sufficiently comparable, widespread, and quantifiable social metrics. Therefore, the present study aims to provide a broader perspective of social performance, including both internal and external metrics. With the goal of providing a more holistic performance assessment, and based on findings present in the current literature, a social performance metrics framework is proposed. The framework proposes a three-layer approach, which allows companies to strengthen their social performance evaluation, based on internal metrics, while dealing with more complex external metrics.
Keywords: social metrics; performance; sustainability; manufacturing social metrics; performance; sustainability; manufacturing.
Representing a Dynamic Model of Employees Education in the Path of Industrial Clusters Development
by Masoumeh Danesh Shakib
Abstract: Nowadays, in most countries, small and medium sized enterprises (SMEs) play the role from the various aspects like economic, social, manufacturing and offering service. Therefore, the development of this sector has been considered in most developed and developing countries. On the other hand, the access to the local labour market can facilitate the development of this sector. This paper concentrates on the education of workforce in order to facilitate the development of industrial clusters and as a result the development of the country. The results show that if the intended policies apply, the cluster grow faster.
Keywords: Small and Medium Sized Enterprises (SMEs); Industrial Cluster; System Dynamics (SD); Training; Labour.
Analysis of customers impatience on bulk service queueing system with unreliable server, setup time and two types of multiple vacation
by Nirmala Marimuthu, Ayyappan G
Abstract: In this investigation, we analyse the customer's impatience on unreliable bulk queueing system with two types of vacation. Depending upon the length of queue, the server is permitted to take two types of vacation called type I vacation and type II vacation. The server is possibly affected by breakdowns and takes considerable time for setup before the repair begins to start. After repair completion, the server will start its remaining service to the batch of customers whose service was interrupted. It could be assumed that the arriving units may be balked from the system when the server is on vacation (type I or type II). By incorporating the supplementary variables technique, the probability generating function of the queue size at an arbitrary and departure time epoch for the designed queueing system are derived. Finally, the stability condition, some performance measures, particular cases are obtained with appropriate numerical illustrations and graphical presentation.
Keywords: General bulk service; Unreliable server; Two types of Multiple vacation; Setup time and Repair.
Research on Estimation of Equipment Maintenance Duration Based on AHP-FIE Risk Analysis
by Zhengkun Dai, Lu Yao, Jiandong QIN
Abstract: Equipment maintenance duration is an important indicator of equipment maintenance management, and is a key factor to measure the success or failure of a maintenance project. In view of the current situation of inaccurate estimation of equipment maintenance period and frequent changes in schedule, this paper considers the characteristics of many uncertain factors, and studies the estimation of equipment maintenance project duration from the perspective of risk analysis, identifying risk factors and identifying risk factors. Based on the evaluation criteria, the comprehensive evaluation method based on AHP-FIE explores the relationship between risk and construction period, and analyzes through actual cases. The analysis results make reasonable adjustments to the construction period, providing theoretical and practical reference for equipment maintenance duration optimization management.
Keywords: equipment maintenance; duration estimation; AHP-FIE; risk analysis.
Variable Substitution Integral Method and Its Application for Solving Displacement Curves of Framed Structures
by Yuguo Zheng, Yu Wang, Xiangshou Xiao
Abstract: Considering the great importance of structural displacement curves and the shortcomings of the classical material mechanics approach and the conventional structural mechanics one in this aspect, a general analytical method, the variable substitution integral method whose mechanics concept is very clear, was proposed for solving structural displacement curves of framed structures based on virtual work principle and unit load method. The basic principle of the new method was constructed and compared with the classical material mechanics one. The comparison results show that the application of the proposed approach in examples proves that it fully compensates for the shortcomings of the classical material mechanics method and the conventional structural mechanics one. This new method, which is very simple and practical, can be widely applied to analytically solve displacement curves of various static determinate and indeterminate structures, straight or curved framed structures under kinds of internal forces caused by loads.
Keywords: structural mechanics; framed structure; displacement calculation; virtual work principle; unit load method; variable substitution integral method.
Design of Travel Route Recommendation System Based on Fast Spark Artificial Intelligence Architecture
by Xiaolu Wei
Abstract: In order to overcome the problems of low accuracy of current system tourism route prediction and poor accuracy of route recommendation, this paper proposes a tourism route recommendation system design based on fast Spark artificial intelligence architecture. For the hardware part, the system module structure is constructed as a way to obtain data. For the software part, firstly, the problem definition of tourism route recommendation is given, secondly, the Markov model is constructed, and finally, the tourism route is excavated. By sorting the transfer probability of tourist attractions, the tourism route can be obtained, and the design of the software part of the system is completed. Through the design of hardware and software of the system, the tourism route recommendation is finally realized. The experimental results show that the proposed system not only has a high accuracy in predicting tourism routes, but also can accurately recommend tourism routes to users.
Keywords: Fast Spark; Artificial Intelligence Architecture; Travel Route Recommendation; System Design.
Parking Correction Of Strapdown Inertial Navigation System
by Yan Zhang, Jianzhong Wang
Abstract: Laser gyroscope strapdown inertial navigation system can provide accurate navigation for carrier without depending on external information. Due to the enlargement of long-term cumulative navigation error, it needs to be revised at regular intervals, so its mobility is limited. In regard to the practical application of vehicle navigation, an adaptive zero velocity correction method is proposed. Fifteen basic error parameters are constructed by using the constraint condition of zero velocity. According to the error characteristics of the system itself, the state measurement matrix and equation of the system are designed. Based on the observability theory of general condition number, the observability of each state of the system is analysed and the parameters of Kalman filter are determined, which effectively improves the IMU navigation accuracy of inertial navigation components. Experiments show that this method can overcome the problem of frequent parking and effectively improve the navigation accuracy and mobility of the system.
Keywords: Strapdown Inertial Navigation System; Zero Speed Correction; Attitude Angle; Error Equation; Kalman Filtering.
Can Internal Marketing Activities Save Small and Medium Industrial Enterprises in a Tough Economy? Back to the Basics Approach
by Ghaith M. Al-Abdallah
Abstract: Recently, and due to the economic pressure in Jordan, several small and medium enterprises have filed for bankruptcy, or downsized their business leading to the layout of hundreds of employees, which will deepen the economic problems in Jordan and increase the circle of effect. Small and medium enterprises can follow other courses of actions to address such issue. This paper aims to understand the possible impact of internal marketing practices and activities during economic problems on the employees' productivity in small and medium industrial enterprises. In order to achieve this aim, a descriptive analytical methodology was used, quantitative approach through survey strategy was applied and electronically administrated questionnaires were utilised to collect the primary data from a representative stratified random sample of 490 small and medium industrial enterprises out of 2,291 registered local small and medium industrial enterprises. 345 filtered and screened questionnaires were analysed using SPSS, the main results of simple and multiple regression analyses indicate that internal marketing mix has a strong positive direct effect on employees' productivity, where internal promotion has the most effect followed by workplace, internal product and internal price respectively. Discussion, conclusion, and recommendations are provided based on the results of the study.
Keywords: Internal Marketing; Employees Productivity; Small and Medium Enterprises; Industrial Sector; Tough Economy; Developing Countries; Jordan.
Research on Hybrid Energy Hierarchical Coordination Control Method for Grid-connected Micro-Grid
by Huichuan Liu, Guowen Li, Jingyi Wang
Abstract: In order to effectively solve the problem that it is difficult to coordinate the operation state of grid-connected micro-grid, a hierarchical coordinated control method of hybrid energy in grid-connected micro-grid is proposed. The mathematical model of the relationship between system power and cost function and the hierarchical model of micro-grid are established. Provide optimisation objectives by constructing objective functions; the information exchange and energy control between the systems are used to realise the grid connection. Simulation results show that the frequency of the proposed method is always around 50HZ, which is the closest to the planned value. The difference between the power value and the planned value is less than 1 kW, which is more in line with the actual needs than other methods. It is proved that this method can effectively control energy and ensure the smooth operation of micro-grid.
Keywords: Grid-Connected Micro-Grid; Hybrid Energy; Hierarchical Control; Coordinated Control.
Modeling and Analysis on Bearing Capacity of Asphalt Pavement in dense traffic flow area of urban of Urban
by Zhongwei Liu
Abstract: Aiming at the problems of low fitting degree and high complexity between the research results and the actual situation, the bearing capacity model of asphalt pavement in dense traffic flow area based on combination forecasting is put forward. Cellular automata is used to calculate the relative position and speed change of vehicles in the popularisation process. According to Orkut model, the relative position and speed change of each vehicle on the road is calculated and analysed. Through calculation and analysis, the vehicle load concentration value is obtained. The experimental results show that the SSE, MAE, MSE and complexity coefficient of the bearing capacity model for asphalt pavement in heavy flow area based on combined prediction are lower than 0.05, lower than 0.15, lower than 0.16 and lower than 0.2, which are the minimum values in the comparison method, indicating that the model has high accuracy, low complexity and good reliability.
Keywords: Dense Traffic Flow Area; Asphalt Pavement; Bearing Capacity; Model Construction.
Leadership competencies for high performance - a quality systems perspective
by Fulufhelo Masithulela, Kemlall Ramsaroop Ramdass, Kgabo Mokgohloa
Abstract: Organisations continuously experience change in terms of increasing customer demands. This realigns to the impact on quality, innovation, service speed and delivery, and price. In order to maintain competitive advantage in all these aspects, it has become inherent to examine leadership competencies in driving the organisation towards operational excellence. Empirical evidence shows that South Africa does not have sufficient competent leaders that have the ability to master the art of change management. The global business environment is dynamic in nature and competitiveness is vital for survival. Leadership is required to steer the organisation towards sustainable operational excellence. In addition, literature advocates management commitment in driving system implementation. Competent leaders have the ability to strategically position themselves in the implementation of a new system that affect the entire value chain. In this study, an evaluation is done to determine the leadership competencies required in the implementation of the ISO 9001 quality management system (QMS) through quantitative analysis. The paper aims to determine the leadership competencies that are essential from a South African perspective in the implementation of the ISO 9001 quality management standard.
Keywords: Leadership competencies; systems engineering; organizational leadership; ISO 9000.
Strategic Decisions on the Establishment of an Offshore Warehouse for Manufacturers with an E-Commerce Channel
by Qiran Wang, Yongzhong Wu, Yongwu Zhou
Abstract: While Chinese manufacturers increasingly use e-commerce platforms to sell products to overseas customers, expensive international express delivery is commonly used to meet the short order-to-delivery times. Many manufacturers are considering renting or constructing an offshore warehouse to reduce logistics costs while ensuring fast delivery. Goods are stored in the offshore warehouse and customer orders are fulfilled by the warehouse inventory. Strategic decisions arise regarding the need for as well as the location and capacity of an offshore warehouse. This paper establishes a discrete-event simulation model to analyze the dynamics of these decisions; the key variables include the order arrival rate and lead times in the supply chain. The optimal inventory policy (safety stock and replenishment quantity) of the offshore warehouse is obtained via a meta-heuristic method embedded in the simulation model. Experiments and a sensitivity analysis are conducted to evaluate the impact of the key variables on the strategic decisions.
Keywords: E-commerce; Offshore warehouse; Discrete-event simulation; Order-to-delivery time.
Identifying the Companies Bankruptcy Using an Enhanced Neural Network Model; Case Study: Evaluating the Bankruptcy of Iranian Stock Exchange Companies
by Shahin Ordikhani, Sara Habibi, Ahmad Reza Haghighi
Abstract: The purpose of this research is to utilize an enhanced neural network model to anticipate the bankruptcy of stock exchange companies and test the predictive power of this model by considering the concept of misclassification. Misclassifications decrease the accuracy of prediction. Among every one of the structures of the two-layer neural network, the Perceptron model with the structure of nine neurons in the input layer and a neuron in the output layer with the Levenberg learning algorithm demonstrated the most predictive power. The neuron structures three, five, and nine were considered to decide the proper characteristics of a two-layer perceptron for anticipating companies' bankruptcy. Among them, the two-layer perceptron with nine neurons in the input layer and one neuron in the output layer identified to has the best performance. The findings demonstrate that applying artificial neural network models amplify financial management for facing with fluctuations and bankruptcy.
Keywords: Effective Predicting Financial Rates; Bankruptcy; Neural Network; Machine Learnings; Predictive Power.
Product Acceptance; Service preference based on E-service Quality using G-Rough Set Theory
by Shib Sana, Mohammad Ehsan Souri, Reza Sheikh, Fatemeh Sajjadian
Abstract: Nowadays, the competitive environment of e-services companies has made them deliver high quality of services. In fact, perceived quality of E-services by consumers which determines their behavior towards products is defined as product acceptance. Consumers have a powerful potential to pass their experiences to other consumers. In this regard, this study intends to detect the rules determining the behavior of consumers in product acceptance based on perceived quality of e-services. Accordingly, 407 questionnaires were distributed among online retailers consumers and then Grey Rough set theory was applied to analyse them. Perceived quality dimensions and Net Promoter Score (NPS) were determined as condition and decision attributes, respectively. Finally, the six rules determining the behavior of consumers were extracted through data analysis process. Furthermore, the results showed that Efficiency, System availability, Fulfilment, Responsiveness and Contact are the most important factors determining product acceptance.
Keywords: Consumer behavior; Rough set theory; Grey system; Net Promoter Score; Service quality; Product acceptance.
Chinas Manufacturing Servitization Level and Its Impact on Enterprise Performance: Model and Empirical Study
by Jifei Xie
Abstract: A comprehensive evaluation index system and a fuzzy evaluation model of servitization level are constructed. Based on the cross-sectional data of 903 listed enterprises in 29 manufacturing industries in 8 provinces and cities in China in 2016, an empirical study on Chinas manufacturing servitization level and its impact on enterprise performance is carried out. The results show that: The first-tier cities and high-tech industries are in leading positions in servitization. There is an inverted U relationship between servitization level and both the return on equity and return on total assets, and a U relationship between servitization level and the return on personnel. In terms of human capital investment, the manufacturing enterprises are facing
Keywords: manufacturing servitization; index system; fuzzy evaluation model; empirical study.
Modelling and Assessment of the Impact of Supply Disruption and Cost of Recovery using System Dynamics Approach
by P. Raghuram, G. Harisankar
Abstract: Shorter product life cycles and customization have exposed the hidden problems in the supply chain. Supply disruptions, caused due any sudden event, is one of the major concerns of the manufacturing industry. This paper focusses on the impact of non-availability of parts from a supplier due to unpredictable events and the cost of recovery from such disruption. System dynamics approach is used to model the interactions between the variables required to maintain the availability of parts. In this model, time to restore operations, time to find alternate suppliers, inventory consumption till restoration, safety stock availability and backlogs are considered. This model was then used to assess disruption impact on inventory, lead time and recovery costs using iThink software. Assessment of supply disruption for all the procured parts will help the company to recognize and take proactive steps, such as identifying alternate suppliers, making engineering changes and modifying the manufacturing processes.
Keywords: supply disruptions; inventory; modeling; assessment; system dynamics.
Multi-item single-source (MISS) production quantity model for imperfect items with rework failure, inspection errors, scraps, and backordering
by Javad Taheri-Tolgari, Abolfazl Mirzazadeh
Abstract: In this paper, a multi-item single-source (MISS) production quantity model is studied that includes some practical and realistic attributes. In practice, frequently, both the manufacturing process and screening procedure of a producer are not perfect, hence manufacturing and accepting a part of non-defects and a part of defects. Most of the verified inventory systems with defective quality items, although, have not allocated together such significant realistic or practical conditions including both imperfect item in the manufacturing process and imperfect classifying procedure. Therefore, in this research investigated a cost-minimizing imperfect quality system along with two Types of errors in the inspection process and refund that finds an optimum manufacturing quantity with backorder for the multiple items single machine. Finally, a numerical example is solved by sensitivity analysis to illustrate the practical and realistic applications of the presented methodology.
Keywords: Multi-item single-source (MISS); Imperfect item; Inspection error; Rework failure.
Network Design for Reverse Logistics Considering Carbon Tax
by Bandar Alkhayyal
Abstract: A research model using the market price for emission allowances per metric ton illustrates how the economic and environment mechanisms of carbon price can be formulated using deterministic equilibrium model. Moreover, this framework allows us to examine the performance of, and identify how the policy proposed would affect the profitability of remanufactured goods; a comprehensive study for the quantitative evaluation and performance of the model has been done using Orthogonal Arrays. As demonstrated by the results, the policy related to carbon tax brings about a powerful limitation on the quantity of emissions of carbon produced by the operations of supply chains; the case study herein employed real sites and data from the Boston region. Lacking in a carbon tax, the margin of profit realized by the A/C unit is 26%, while the amount suggested by the USEPA, $40/ton CO2 equivalent (tCO2e) tax, lessen the profit margin to 19%.
Keywords: Low Carbon Logistics; Reverse Supply Chains; Circular Economy; Greenhouse Gas (GHG) emissions; Extended Producer Responsibility; Industrial Engineering.
Biodegradable Plastics with Natural Additives as a Replacement for Synthetic Plastics
by Irene Gabriel, Amal Elhussieny, Marwa Faisal, Giacomo DAngelo, Nesma Aboulkhair, Nicola Everitt
Abstract: A massive outburst in the manufacturing of synthetic plastic has occurred due to its availability, durability and low-cost relative to glass, paper and fabric. In order to combat the plastic pollution phenomenon, it is impossible to eliminate the use of disposable plastic products; however, it could be replaced with an eco-friendly substitute. This study presents a comparison between different composite films with natural reinforcements. The matrices and reinforcements were produced from chitosan extracted from shrimp shells waste and rice straw waste, respectively. Experimental and statistical analysis were performed to define the most desirable filler type and concentration with respect to physical, biological, mechanical and thermal properties. Experimental results showed that the mechanical, thermal, and biological properties of the chitosan (and nano chitosan) films were improved by the addition of 25 wt. % and 35 wt. % of rice straws and nano rice straw fibres.
Keywords: Nanotechnology; fillers; composites; sustainability; valorisation; natural polymer.
Stability Analysis Of Cross-Section Of Double-Row Large-Diameter Pipeline Based On Bim Technology
by Wen-bo WANG
Abstract: For X80 pipeline with 1219mm diameter as the representative, an analysis method of the pipeline cross-section stability based on BIM technology is proposed in this paper. According to the basic theory of pipeline cross-section stability, the influence factors of pipeline cross-section instability are analyzed. According to the requirement of the stability check, the criterion for the stability of the cross-section of the double-row large-diameter pipeline under the pressure of external load is determined. The dynamic response and deformation law of the cross-section of the double-row large-diameter pipeline under the impact of rockfall are analyzed by ABAQUS software and BIM Technology. The stress-strain response of the cross-section is obtained. The reasons of the pipeline cross-section instability have been clarified, which provide some reference for the pipeline construction and protection.
Keywords: BIM technology; double-row; large-diameter pipeline; cross-section; stability.
Simulation Analysis On Continuous Collapse Resistance Of Assembled Building Structure Under Multi-Dimensional Earthquake
by Wei Sun, Yi Cui
Abstract: In order to provide reference for seismic research in related engineering design and enhance the continuous collapse resistance performance of building structures, the simulation analysis on continuous collapse resistance of assembled building structures under multi-dimensional earthquake is carried out. Taking the 5-story assembled building structure as the research object, the researched assembled building structure was modeled by SAP2000, and the load-time variable was defined and assigned to simulate multi-dimensional seismic waves. The simulation analysis on the continuous collapse resistance of building structures during the failure of the diagonal column, the long-side middle column and the internal column showed that under the multi-dimensional earthquake, the failure of the structural column had a great influence on the direct supporting beam, and the whole building structure appeared to a certain extent continuous collapse.
Keywords: multi-dimensional earthquake; assembled building structures; resistance to continuous collapse.
Sudden Risk Predication Model of Construction Supply Chain Based on Data Mining
by Jinrong Nie
Abstract: In order to improve the accuracy and capability of quantitative evaluation to sudden risks of the construction supply chain and effectively guide the prevention of them, a sudden risk quantitative evaluation and predication model of the construction supply chain based on data mining and multiple regression analysis is proposed. In this method, firstly, information acquisition and adaptive feature extraction are performed to characteristic quantity in quantitative analysis of sudden risks of the construction supply chain. Secondly, a stochastic probability density model is adopted to decompose characteristics of sudden risks of the construction supply chain, and risk evaluation and relevant predication are performed to the construction supply chain through internal control and extract control. The simulation results show that the method can provide relatively high accuracy in predicating sudden risks of the construction supply chain and has relatively good global convergence and optimisation ability in predication.
Keywords: Data mining; the construction supply chain; risk predication; feature extraction; regression analysis.
Study On Design Of Interior Lighting System For Office Buildings With Large Windows
by Xing-gang ZHANG
Abstract: In this paper, an interior lighting system is designed for the building based on PLC. The hardware of the system focuses on the design of the interior environment light acquisition unit, human body signal acquisition unit, watchdog unit, and demodulation unit to achieve overall system monitoring and signal controlling of hardware operation. The software of the system repeatedly invokes the subroutine through the main program to execute the commands issued by the upper computer to complete the control of the overall system operation. Experiments show that the average energy consumption of the system is 50J, and the average reaction time is 0.2s, and the maximum operating stability coefficient is 0.9. The system can reduce the energy consumption and reaction time of lighting operation, improve the system operation stability, and provide scientific support for the development of this field.
Keywords: large windows; office buildings; interior lighting systems; design.
Mechanical & Physical Behaviour of 3D Printed Polymer Nanocomposites-A Review
by Mir Irfan Ul Haq, Ankush Raina, Aysha Farzana Kichloo, Ruttba Aziz
Abstract: In the modern product development process, 3D printing is emerging as a novel technology for rapid manufacturing of components with complex geometries. Thermoplastic polymers are widely being 3D printed, however due to their poor mechanical properties, there is a growing need for polymer composites which possess better performance. The favorable properties offered by nanocomposites have led to shift in focus towards development and characterisation of various nanocomposites. In this paper studies directed towards nanocomposites processed via Fused Deposition Modeling method have been reviewed. The effect of various reinforcing agents and various process parameters on mechanical properties of these nanocomposites has been presented. The literature suggests that additive manufacturing has tremendous potential in improving the properties of the polymeric composites. Moreover, the 3D printing technology is flexible enough to shorten the product development time. However, the effect of various process parameters on the mechanical properties needs to be studied in detail.
Keywords: 3D printing; Nanocomposites; Polymers; Mechanical Testing; Product Development; Fused Deposition Modelling.
Research on Collaborative Distance English Teaching System Based on Mobile Cloud Computing
by Xiaozhen Shi, Lei Hou, Dunn Wang
Abstract: In order to overcome the problems of low success rate and poor robustness of traditional distance English teaching system, this paper proposes a new collaborative distance English teaching system based on mobile cloud computing. In the hardware part of the system, USB-to-JTAG device is used to download files, and the reverse direction principle is used to upload English teaching resources. The software part of the system is built with the structure of Yangtze River. Virtual teaching places and video voice teaching methods are established to achieve long-distance synchronous teaching. The experimental results show that the success rate of the cooperative distance English teaching system based on mobile cloud computing is 98.2%, and the robustness of the teaching system is 94.5%, which are obviously higher than the traditional methods. It proves that the proposed method has better reliability and is more suitable for English teaching system.
Keywords: Mobile Cloud Computing; Collaboration; Distance Learning; English Teaching.
Simulation Research on Active Control of Low Frequency Modal Vibration of Double-Joint Flexible Manipulator
by Laoxiang Liu
Abstract: In order to solve the problem of low control precision and high noise in the traditional vibration control method of manipulator, the active control method of low-frequency modal vibration of double-joint flexible manipulator is proposed. In this method, the finite element equation and modal technology are used to construct the dynamic model of the double-joint flexible manipulator and distinguish the low-frequency mode from the high-frequency mode. Then, the low-frequency mode of the dynamic model is transformed into the state-space equation based on the state variable. The simulation results show that the position errors of the elastic displacement in X and Y directions of the slave arm and the center of the mobile platform under the control of the proposed method in this article are all less than 0.02mm compared with those failure to implement control.
Keywords: double joint; flexible manipulator; low frequency; modal vibration; active control; simulation.
Deployment of the Taguchi technique for surface roughness optimisation
by Ismail W. R. Taifa, Vivek A. Deshpande, Nesredin Chekole Deresse
Abstract: The aim is to investigate the machining parameters that are important to optimise surface roughness (Ra) through experimentation for EN45 steel material (AISI 9260). Optimisation of the machining parameters for a cylindrical grinding operation helps to save time, cost, and influence to get better surface characteristics and surface finish. The study deployed the Taguchi technique. The scrutinised factors included the feed rate, work speed and the depth of cut (DOC). Experimental set up involved the L9 orthogonal array. Minitab® and Microsoft® Excel 2016 generated results after applying the design of experiment. The Ra was tested by using a portable surface roughness tester. The silicon carbide wheel and a hydraulic cylindrical grinder machine were used. After analysing the generated results, DOC was found to be statistically significant. The influential parameter of Ra was found to be DOC as it contributed to 45.3% and 58.6% before and after heat treatment processes, respectively.
Keywords: optimisation; Taguchi methods; surface roughness; cylindrical grinding operation; grinding process; EN45 steel material; ANOVA; affinity diagram; design of experiment; orthogonal array.
A non-radial approach to improve the interval cost efficiency score in DEA
by Simin Tohidnia, Ghasem Tohidi
Abstract: This paper suggests an approach for improving the cost efficiency score of inefficient decision making units (DMUs) with interval data. Corresponding to each inefficient DMU, we consider an interval ideal input vector and then develop two non-radial models to determine a point in the production possibility set that can produce the given interval output vector with the minimum possible cost and is closest point to the corresponding ideal point. By replacing the observed interval input vector with the interval input vector of the obtained point, one can improve the lower bound of the interval cost efficiency score as much as possible while the upper bound can achieve one. A numerical example also will be designed to demonstrate the applicability of the proposed approach.
Keywords: Data envelopment analysis; cost efficiency; interval data; ideal input vector; non-radial model.
Optimization of Total supply chain cost of Multi-Echelon system in Leagile network under probabilistic Demand
by ADAM NAGA PHANEENDRA
Abstract: In the era of competitive digitalised world inventory management and cost control in total Supply Chain (SC) becomes challenging job for industrialists and researchers. In general, Supply chain contains of multi-supplier, retailer, and manufacturing plants at various locations where it supplies versatile products to the end users with trending expectations in stochastic demands. To control total SC cost, the optimum level of inventory should establish at every location by considering various influencing factors. Therefore, this paper developed a computational complex problem considering all practical scenarios subjected to quantity, cost, capacity and space constraints with the aim of minimizing total SC cost and improving legality of SC network. A Novel Self-adaptive Harmonic Search (NSHS) algorithm applied to accomplish accurate results efficiently. Finally, this novel model demonstrated with an illustrative example tested with practical data to prove its feasibility and effectiveness.
Keywords: Inventory management; order quantity; Novel Self-adaptive Harmonic Search (NSHS).
Solution Approaches for Multi-workday Vehicle Routing Problem with Manual Unloading
by Tarit Rattanamanee, Suebsak Nanthavanij, Aussadavut Dumrongsiri
Abstract: The daily delivery routes and carried loads of vehicles are determined for a multi-workday planning period. Upon arrival at customer locations, workers, who are pre-assigned to vehicles, must perform manual unloading of goods. The multi-workday vehicle routing problem (MW-VRP) with manual unloading is solved using three solution approaches, namely, minimum-distance fixed-route, minimum-distance varying-route workload-constrained, and workload-balanced varying-route. The total travel distances of vehicles and average percent residual energies among workers are determined and compared among the three approaches. The results show that the MW-VRP which considers the physical workloads that workers have to endure each workday throughout the planning period can help to distribute daily manual handling tasks more evenly among workers.
Keywords: Vehicle routing problem; multi-workday planning; physical workload balancing; worker-vehicle pre-assignment.
Remaining Useful Life Estimation by Stochastic Markov Model and Monte-Carlo Simulation
by SMRITI MISHRA, PRASHANT BHARDWAJ
Abstract: Estimation of remaining tool life is important in planning condition based maintenance program and helps us by preventing any production loss. The paper proposes a method to obtain Remaining Useful Life (RUL) Estimation of a single point turning tool using stochastic Markov method. In this experiment mild steel work piece is machined for a constant length on lathe machine by high speed steel tool and flank wear width for different number of passes of tool over work piece is recorded for constant feed, speed and depth of cut up to failure. A state based model is developed considering four gradually degraded stages of the tool. The rate equations are derived for the four state Markov model representing the change of the state probability with respect to time for each state which is solved by Runge-Kutta method by using MATLAB software. The analytical results are verified by Monte Carlo Simulation.
Keywords: Cutting tool; Prognosis; MTTF.
The value of ecosystem collaboration: Fleet life cycle data -based cost-benefit model
by Sini-Kaisu Kinnunen, Salla Marttonen-Arola, Timo Kärri
Abstract: To successfully manage asset fleets requires data collection from a fleet that can be distributed globally and into several companies. Thus, data collection is often conducted by multiple actors in a business ecosystem, which makes it difficult to get access to all the data concerning a fleet. It is important to demonstrate the value that can be achieved by systematically utilizing fleet data as a support of fleet-level decision-making. There is huge potential to benefit from fleet data due to increasingly gathered data, Internet of Things technologies, and data analysis tools. In this paper, a model is proposed to illustrate the ecosystem around a fleet and how to evaluate the costs and benefits of fleet data utilization in an ecosystem. The challenge lies in determining whose value should be maximized and how the ecosystem could develop collaboration in data utilization to create value for the ecosystem.
Keywords: cost-benefit model; value creation; fleet; asset management; data utilization; ecosystem; collaboration; value of data; cost of data.
Material selection for design of powered hand truck using TOPSIS
by Aditya Patil, Bhushan Adavadkar, Harsh Chhatriwala, Mohit Keswani, Sachin Chede
Abstract: Selection of materials in engineering design have vital role. Choice of relevant material for particular product is major task for designers. In this paper we are using Multi Criteria Decision Making (MCDM) TOPSIS tool for selecting the material for the designing of powered hand truck. The suitable five materials (SS 304, AISI 1010, AISI 1020, Al 6061-T6, Al 5052-O) are taken into consideration and with attributes as 5 material properties as well as characteristics (tensile strength, modulus of elasticity, density, affordability, machinability) are considered for analysis purpose. The attribute weights are computed using entropy method. As per the analysis AISI 1020 is more suitable material and hence chosen for designing and fabrication of powered hand truck.
Keywords: material selection; MCDM; TOPSIS method; Weightage calculation; Entropy method.
Assessment of human and system related barriers during implementation of Green Leagile Six Sigma (GLSS) in Indian manufacturing industries
by NAVEEN VIRMANI, Urmi Ravindra Salve
Abstract: There is a radical change at level of competition during past few years in manufacturing industries. Today, the customer desire high quality products at economical price and that too in minimum span of time. So, it is required for industries to adopt manufacturing strategies in compliance with customer requirements and preferences. Also, there is a need of using greener technologies to manufacture products. Therefore, it is imperative to produce economical products quickly while maintaining quality norms (ISO, OHSAS etc). Industries are required to adopt state-of-art technology, methods and research strategies to compete in the global market. In this paper, concept of Green Leagile Six Sigma has been discussed and human factors and system related barriers had been identified through literature review. Exploratory factor analysis (EFA) technique used to categorize the attributes into constructs. Also, Confirmatory factor analysis (CFA) was used for model fit.
Keywords: GLSS; Agile; Green; EFA; CFA; Lean; Six Sigma.
Demand-Supply Planning and Sustainability Aspect for Agro-based Perishables in Cold-chain
by AMAN BHATNAGAR, Prem Vrat, Ravi Shanker
Abstract: The primary objective of this paper is to: (i) determine the optimum storage requirements for agro-based perishables using production and distribution planning model to absorb the demand fluctuations in an economic manner, encouraging inter-state transportation of perishables so that available infrastructure is utilized efficiently, (ii) determine the cost variation along the potato value chain from farm to fork (iii) analysing the cost of building cold storage, (iv) focus on the sustainability aspect of cold-chain in order to have better utilisation of the cold storages and logistics, thereby reducing food loss and carbon footprints (v) determine the payback period of the investment made, Profit & Loss (PnL), Un-discounted rate of return, Earnings before interest, taxes, and amortization (EBITA) Margins, Profit After Tax (PAT), projected balance sheet and depreciation schedule.
Keywords: cold-chain; cold storage; potato value chain; inter-state trade; transportation; logistics distribution and perishable agri-value chain.
Production Lead Time Improvement through Lean Manufacturing
by Sisay Geremew Gebeyehu, Amdework Gochel, Muluken Abebe
Abstract: The aim of this research was to improve the production lead time by minimizing different wastes which does not add value on final product. First, the current production floor and layout has been studied and mapped using Value Stream Mapping and Spaghetti Diagram is applied to identify manufacturing wastes. Next, lean manufacturing techniques have been deployed to improve the bottleneck areas. The result shows that production lead time was reduced by 23.66%, process cycle efficiency was improved 8.6%, Work in Process (WIP) time reduced by 25.59%, non-value adding time (waiting time) reduced by 37.74%, total distance traveled reduced by 61.2% and the number of workers reduced by 9. Finally, it was concluded that the research has significant benefit for Hibiret Manufacturing & Machine Building Industry (HMMBI) and similar manufacturing industries.
Keywords: Lead time; lean manufacturing; value stream map.
A maintenance optimization approach based on genetic algorithm for multi-component systems considering the effect of human error
by Hagag Maher, Mohamed F. Aly, H. Afefy Islam, Tamer Abdelmaguid
Abstract: The total maintenance cost can be reduced by grouping maintenance actions of several components. This paper contributes to the existing literature by introducing an enhanced maintenance optimization approach that considers the effect of maintenance crew loading due to grouping on the maintenance decisions of multi-component systems. A modified mathematical model is firstly developed for evaluating the failure probability function of each component, the remaining useful life and the maintenance cost. Economic and structural dependencies are taken into consideration. A simulation is secondly implemented to provide estimates of the associated costs with changes in the decision variables. Using the simulation model, an optimization approach based on a genetic algorithm is thirdly developed to minimize the long-term mean maintenance cost per unit time. Computational results show that the proposed maintenance optimization approach provides considerable maintenance cost savings and emphasizes the importance of considering the effect of maintenance crew constraints in maintenance scheduling.
Keywords: Maintenance grouping; multi-component systems; genetic algorithm; maintenance human constraints; maintenance process simulation.
Buffer allocation in asynchronous serial production systems with Bernoulli machines during transients
by Hongwei Liu, Wenchong Chen, Ershi Qi
Abstract: Some asynchronous production systems can never be truly balanced. This phenomenon demands the incorporation of asynchronism and unreliability in buffer allocation problems (BAPs). This paper reports a BAP in an asynchronous serial production system with Bernoulli machines. A profit-based integer programming model is formulated to maximize the throughput and minimize the buffer capacity simultaneously. Because the production run is finite in the current mass customization environment, a transient analysis is used to estimate the system performance. Piecewise closed-form expressions are derived for a two-machine case based on Markovian structures. For M > 2 machine lines, an efficient recursive algorithm based on aggregation is developed. Considering the non-linear characteristic of this BAP, a dynamic-objective particle swarm optimization with neighborhood searching is developed. This approach is verified by a case from an assembly plant. The results demonstrate that the programming method can increase the system profit by 1.85%.
Keywords: Buffer allocation; asynchronous serial production line; Bernoulli machines; transient analysis; dynamic-objective particle swarm optimization.
Robust Simultaneous Lot-sizing and Scheduling with considering Controllable Processing Time and Fixed Carbon Emission in Flow-shop Environment
by Mehdi Bijari, Milad Mirnajafi Zadeh
Abstract: A new robust model is presented for simultaneous lot-sizing and scheduling problem in a flow-shop environment with controllable processing time in this study. In view of the importance of carbon emissions in green production, this model takes account of limitations in this respect. Different speeds of machines can also affect production, back order, inventory holding costs, scrap rates, as well as carbon emissions. In the present study, a new model is proposed under certainty and uncertainty. In order to deal with uncertainty, robust optimization is employed. The robust model in this study is in non-deterministic polynomial-time (NP) hardness complexity class; therefore, a total of five heuristic algorithms are introduced based on Fix-and-Relax (F&R) and Fix-and- Optimize (F&O) approaches to solve larger instances. In conclusion, the results obtained from the algorithms based on F&O are given higher quality solutions compared with those based on F&R heuristic.
Keywords: Simultaneous Lot-Sizing and Scheduling; Controllable Processing Time; Carbon Emission; Robust Optimization; Fix and Optimize.
Optimal Pricing for Ride Sharing
by XIANGYING CHEN, Yongzhong Wu, Yuxin Lu, Yongwu Zhou
Abstract: The ride sharing business has developed rapidly in recent years. The pricing of the ride sharing service is critical for the profitability of the operators. Pricing too high may reduce passenger demand, and hence increase detours and distance, while pricing too low may reduce the revenue. In order to analyze the dynamics of optimal pricing, a mathematical model is developed to maximize the total profit.In the model, the higher-level pricing decision depends on the lower-level order assignment and routing problem.Numerical experiments with the model show that the operator does not necessarily benefit from providing the ride sharing option. The pricing of ride sharing is critical for profitability. When the total travel demand is high (e.g., in peak hours), the operator should adopt a lower relative pricing in order to maximize profit.
Keywords: Ride sharing; optimal pricing,vehicle routing problem; choice model; order assignment.
Robust Design Optimization of Cutting force and Material Removal Rate in thread turning process
by Suraj Rane, Amar Dalvi, Sujay Kharat, Raheel Kittur
Abstract: Thread Cutting is a most commonly used method of producing threaded components in small scale industries. Literature review revealed that enough research is not undertaken in optimization in thread turning, in spite of it being a widely used method of producing threads. The present work highlights a case from a small scale organization, manufacturing hexagonal headed bolt with high accuracy in lean environment. The objective was to optimize Cutting Force and Material Removal Rate, which were indicators of power consumption and productivity, respectively. To obtain optimal levels of input parameters using less number of components, Robust Design Methodology was used. The input parameters studied are cutting speed, depth of cut and infeed angle, in external thread turning of Mild Steel. The optimum level of each input variable was found out for minimum cutting forces generated and maximum material removal rate. Significant improvement in power savings and productivity was observed.
Keywords: Thread turning; Cutting forces; Material removal rate; Robust Design; Taguchi method; ANOVA; Orthogonal array; Signal-to-Noise Ratio; Cutting speed; Depth of cut; Infeed angle.
Simulation modeling for performance optimization of the skimmed milk powder production system of a dairy plant
by Anil Kr. Aggarwal
Abstract: The purpose of this paper is to deal with the simulation modelling and performance optimisation for the skimmed milk powder production system of a dairy plant using genetic algorithm (GA). This analysis is based on Markov birth-death process, the mathematical formulation of the system is carried out to derive first order Chapman-Kolmogorov differential equations by assuming that the failure and repair rate of each subsystem follows exponential distribution. The proposed method is used to compute long run availability using normalising condition, initial boundary conditions and recursive method. It provides the optimum system availability level for different combinations of failure and repair rates parameters of the subsystems of the skimmed milk powder production system of a dairy plant concerned. The results are presented and discussed with the plant personnel to adopt and practice suitable maintenance policies/strategies to enhance the productivity and quality of skimmed milk powder production system of the dairy plant.
Keywords: Markov process; Markov modelling; Chapman-Kolmogorov differential equations; long run availability; performance optimization; skimmed milk powder production system.
Locating warehouses shared by retailers for fast-fashion products considering consumers waiting cost
by Zhi-hua Hu
Abstract: This study developed and formulated a strategy based on warehouses shared among retailers for fast-fashion products retailing. The requested products are delivered from a nearby warehouses shared by several retailers. However, the consumers waiting times decrease the service satisfaction and still have the risk that the delivered products were not accepted by consumers. The numerical results demonstrate that the waiting cost is affected by travelling times, delivery cost, fixed cost for shared warehouses, and the waiting cost function of time, whereas the profit is mainly affected by product gross profit, discount compensated to consumers for waiting, the unmet ratio after the requested products are delivered to the retailer, and the variable cost of handing and storing products. The consumers waiting at the retailers are impacted by the loss of waiting times. Simultaneously, the retailers take a loss when the delivered products are not suitable for the consumers.
Keywords: Logistics management; fast fashion; warehouse; retailing; waiting cost.
Stochastic analysis of an imperfect production-inventory system with consideration of random machine breakdown, rework, inspection, and environmental emissions
by Rubayet Karim, Koichi Nakade
Abstract: Incorporation of production disruption, quality, inspection, and environmental concerns in the production and inventory model has obtained significant attention in literature; nevertheless, researchers study these subjects individually. It is necessary to jointly incorporate all those aspects in a single research study to support decision making, and gain new insights for complexities in practice. This paper takes the initiative in this respect. The objective is to determine the optimal rate of production and to examine the impact of emission penalty cost along with other costs on the production rate and on the long-run average cost of a manufacturing system. First, using the renewal reward theorem, a model is formulated by considering a penalty cost for emission. Next, another model is developed by extending the previous model to account for the circumstances where the manufacturing system does not incur an emission penalty cost. The developed models are examined numerically and compared.
Keywords: production-inventory model; defective items; environmental emission; machine breakdown; rework; inspection; Renewal reward theorem.
Production quality improvement for the soft drinks bottling industry through six sigma methodology
by Ismail W. R. Taifa, George S. Mwaluko, Ebenezer Dawson Makundi
Abstract: Increase of rejection rate (percentage) in the production process of soft drinks is one of the chronic problems in industries. Over four months, the production rejection rate (PRR) increased up to 12.62%. This resulted in an estimated loss of 93,412,800 Tanzanian Shilling (TZS) at X-Company. Therefore, this study explored how to improve the quality of production in the manufacturing process of the Tanzanian soft drinks industry. The Six Sigma methodology - DMAIC (define-measure-analyse-improve-control) - was employed. DMAIC considers existing products, process and improves the same. An in-depth insight into PRR and speed of acquiring such insight while increasing the problem diversification was successfully performed. Still, soft drinks companies face high PRR. The critical reasons occur during bottle filling and crowning operations. The sigma level was found to be 4.9 with the cost of poor quality being 12.62%. This study achieved a potential annual saving of 280,238,400 TZS.
Keywords: Six Sigma; six sigma methodology; DPMO; DMAIC; quality improvement; continuous improvement; production rejection rate; soft drinks; bottling industry; manufacturing rejects.
An analytical study on establishing strategies for improving the productivity of the spinning industries
by Ismail W. R. Taifa, Ibrahim Joseph Mwasubila, Beatus A. T. Kundi
Abstract: Strategies for improving the productivity of the spinning industries are much needed. In this paper, a case of a spinning industry was systematically studied. The strategies for enhancing productivity were established through a mixed approach. The studied industry experienced low productivity as they were only achieving 55%68% of their production plan. Also, their actual operational machine availability was 67%. The proposed strategies include improving the spooling and the drawing process by installing new machinery technology; improve raw materials and components flow; hiring well-trained workers; develop employee training programs; search for new market segments; establish effective information and communications technology section, and develop an implementable maintenance plan. The study also revealed that system dynamics modelling helps to arrange descriptive information analytically. Thus, Vensim software was applied to illustrate the 2 I.J. Mwasubila et al. differences between productivity, specifically before and after implementing the established strategies. The study considered only a single industry and single-factor productivity measures.
Keywords: productivity improvement; productivity index; single-factor productivity; multifactor productivity measures; strategies; competitive strategy; system dynamics; Vensim software; spinning mill.
Optimization of multiobjective supply chain networks considering cost minimization and environmental criteria
by John Wilmer Escobar, Natalia Segura Rosas, Juan Camilo Paz Roa
Abstract: This article considers the optimisation problem of a multi-objective mass-consumption supply chain network considering cost minimisation and environmental criteria, as well as the analysis of scenarios with variable demand. This study seeks to determine the closure and consolidation of distribution centres and the identification of product flows in the network. The efficiency of the mathematical model has been tested with real information obtained from a Colombian multinational company manufacturing products of mass-consumption. The results confirm the efficiency of the model and its positive impact on determining the environmental impact of gas emissions related to the type of transportation used and the appropriate cost for the case study company.
Keywords: Network Optimization; Multiobjective Mathematical Model; Total Cost; Environmental Impact; Logistics; Scenario Analysis.
Vulnerability Evaluation of High-rise Earthquake-proof Buildings in High-pressure Area
by Lilin Wang
Abstract: Traditional structural vulnerability analysis neglects the structural mode of earthquake-proof buildings and the role of isolation layer, and there are some deviations in the results of vulnerability evaluation of high-rise earthquake-proof buildings. Therefore, the structural vulnerability evaluation of high-rise earthquake-proof buildings is studied, and the structural vulnerability evaluation method of high-rise earthquake-proof buildings in high-pressure areas based on fuzzy comprehensive evaluation is proposed. Tthe relationship between magnitude and intensity, and the law of intensity attenuation are analyzed, and the differences between traditional earthquake-proof building structure and isolation layer structure are compared; Combining with the method of fuzzy comprehensive evaluation, the vulnerability of building structure is calculated and evaluated according to the fuzzy relation matrix between evaluation index and vulnerability level as well as the index weight coefficient matrix. The experimental results show that the evaluation performance of the proposed method is better than that of the experimental comparison method.
Keywords: high-pressure area; high-rise building; earthquake-proof structure; vulnerability; evaluation.
Agent-Based Heuristics Model for Measuring Customer Disruption Impact on Production and Inventory Replenishment
by Ammar Al-Bazi, Tunde Adediran
Abstract: Agent-based simulation approach in production and inventory environment is capable of responding and adapting to disruptions caused by customers changing requirements. The impacts of disruptions in production and inventory systems can be measured through learning and decision-making ability of system agents. In this paper, agent-based modelling integrated with heuristic optimisation approach is presented as embedded within a scheduling and rescheduling framework. The proposed approach is implemented in a disrupted OEMs parts manufacturing system. The integration of the framework modules in connection with inventory control helped production planners to manage disruptions by tracking order processing times and quantities and for performance measurement. The proposed approach is compared with the few existing related methods like the sequential method. The proposed approach not only revealed the impact of disruptions in terms of process times and order quantities but offered 'available times' which were applied for production support and inventory replenishment. This demonstrates a valuable and viable resolution strategy responding and adapting to disruptions caused by customers.
Keywords: Customer Disruption Impact; OEM Environment; Production scheduling; Inventory Replenishment; Agent-Based Simulation; Heuristics Optimisation.
An overview of industry 4.0 in manufacturing industries
by Dheeraj Nimawat, B. Gidwani
Abstract: In the current scenario, manufacturing industries are rapidly moving towards customized production from mass production to meet the current market competition. Industry 4.0 prompts the digitalization time. Industry 4.0 emphasizes intelligent products, potential customers, and change of industrial machine suits. It is interconnected inside the advanced and innovative view with the comparing virtual portrayal. Industry 4.0 inventiveness has engaged an impressive concentration of industries and researchers. This paper comprises study of 164 reputed research papers and addresses evolution of Industry 4.0, key technologies, initiatives by various nations in this era, review of empirical analysis on Industry 4.0, and presented future scope in the area of Industry 4.0 regarding survey of barriers to adopt Industry 4.0, maturity of Industry 4.0 concept and impact of key technologies of Industry 4.0 in the todays scenario. This paper will help to the existing and future industries, and researchers in the context of Industry 4.0.
Keywords: Industry 4.0; Big Data; Autonomous Robots; Simulation; Additive Manufacturing; Industrial Internet of Things; Augmented Reality; Cyber Physical Systems; Fourth Industrial Revolution.
Single Commercial Aircraft System Value Evaluation Method Based on Requirements Engineering and Value Driven Design in Commercial Aircraft Preliminary Design Stage
by Cheng Chen, Nan Ma, Yang Song
Abstract: The paper proposes a single commercial aircraft system value evaluation method which is applicable in the commercial aircraft preliminary design stage. The approach introduces the idea of Value Driven Design and is integrated in the framework of requirements engineering. The method takes functions and cost as major considerations to obtain value scorings and uses Analytic Hierarchy Process to guide and transmit design value calculations and introduces cost and safety as design constraints of evaluation. The aircraft power supply is taken as an example to illustrate the utilisation of the method. The method can not only provide the corresponding value scorings for different design schemes of an aircraft system, but also help to explore the influence of function optimization and iteration on the functions and values of subsystems and systems, thereby help aircraft designers and project managers make trade-offs and decisions from the perspective of function value.
Keywords: system value evaluation; requirements engineering; value driven design; analytic hierarchy process; commercial aircraft.
BEHAVIOURAL INVENTORY MANAGEMENT: A NEW APPROACH TO INVENTORY CLASSIFICATION BASED ON STOCK-INDUCED CONSUMPTION INDEX
by Neeta Sharma, Prem Vrat
Abstract: This paper presents an analysis of exploratory survey conducted to investigate the consumers perception by using the instrument of structured questionnaire about stock-induced consumption of various commodities which would invariably result in resource wastage. The intended outcome of this survey is to find out the stock-induced consumption index of these commodities which exhibit behavioural tendencies of different consumers. This would eventually be used by inventory control practitioners to estimate the shape parameter (?) of these commodities because parameter estimation is identified as the major limitation resulting in poor applicability of the stock-dependent demand inventory models. In addition, this paper attempts to classify these commodities on the basis of their high, medium and low potential for stock-induced consumption (HML analysis) to facilitate use of resources to their maximum efficiency by concentrating on items having the greatest potential for wasteful consumption. Perishability is considered as one of the driving forces in stock-induced consumption
Keywords: stock-dependent demand; stock-induced consumption index; perishability index; HML analysis; behavioural inventory management.
Minimizing Makespan of Batch Processing Machine with Unequal Ready Times
by Leena Ghrayeb, Shanthi Muthuswamy, Purushothaman Damodaran
Abstract: This research considers scheduling a single batch processing machine at a contract electronics manufacturer. The processing times, ready times and the sizes of the jobs are given and the total size of the batch should not exceed the machine capacity. The batch ready time is equal to the latest ready time of all the jobs in the batch. The objective is to minimize the makespan. The commercial solver used to solve the mathematical formulation proposed requires long run times. Consequently, several heuristics and lower bounding procedures are proposed. Through an experimental study, it is shown that one of the lower bounds is within 40% of the best known integer solution from CPLEX for the 200-job instances. The heuristics are very effective in finding good quality solutions with short run times. For smaller problem instances, the quality of the heuristic solution is within 10% of the best known solution from CPLEX.
Keywords: Batch Processing Machine; Scheduling; Makespan; Heuristics; Lower bound.
A Simulated Annealing Approach to Minimize Makespan in a Hybrid Flowshop with a Batch Processing Machine
by Santha RajaKumari Upadhyayula, Shanthi Muthuswamy, Purushothaman Damodaran
Abstract: A two-stage hybrid flowshop with a batch processing machine (BPM) in stage 1 and a set of discrete processing machines in stage 2 is considered in this research. Job sizes and their processing times are given. The BPM can process multiple jobs simultaneously as long as the total size of all jobs does not exceed its capacity, and the processing time is dictated by the longest processing job in the batch. In stage 2, the jobs have to be processed one at a time. The objective is to minimise the makespan. As the problem under study is NP-hard, a simulated annealing (SA) algorithm was designed. A mathematical formulation was also developed and a commercial solver was used to solve the problem instances. An experimental study was conducted to compare SA with the solver. The study highlights the efficiency of SA in solving larger problem instances with good quality solution in shorter computational time.
Keywords: batch processing machines; BPMs; scheduling; hybrid flowshop; simulated annealing; makespan; heuristics.
A multi-strategy integration Pareto based artificial colony algorithm for multi-objective flexible job shop scheduling problem with the earliness & tardiness criterion
by Boxuan Zhao, Jiao Zhao, Yulei Gu, Jingshuai Yang
Abstract: This paper studies the multi-objective flexible job shop scheduling problem with the earliness and tardiness (E&T) criterion, explores the decoding and search strategies of algorithms under the coexistence of the mean E&T and makespan, and provides a makespan-constrainted three-phase decoding mechanism and local search strategies for both of them. Referencing to the flexibility of the artificial bee colony algorithm framework, multiple strategies are integrated properly in the algorithm to realise simultaneous optimisation of regular and irregular objectives. Through testing six benchmark instances of different scales with tight or loose delivery time for jobs, the distribution characteristics of the Pareto optimal solution set of the collaborative optimisation of the mean E&T and the makespan are explored. The proper integration of various search strategies can make the proposed algorithm have better performance.
Keywords: flexible job shop scheduling; just-in-time delivery; earliness and tardiness; E&T; multi-objective; artificial bee colony.
Applying cross efficiency evaluation methods for multi-objective emergency relief supply chain network model
by Jae-Dong Hong
Abstract: This paper studies a multi-objective emergency relief supply chain network (ERSCN) model, which would play a critical role in providing disaster relief items in time Data envelopment analysis (DEA) method is applied to identify efficient ERSCN schemes among the proposed schemes To overcome the weakness of the traditional or classical DEA method, a cross-efficiency (CE) evaluation method was proposed to improve DEAs poor discriminating power But the original CE method also reveals its own weaknesses. So, the three CE methods, called Aggressive, Benevolent, and Neutral methods, are proposed to complement the shortcomings of DEA and CE DEA methods. This paper proposes a process of applying these CE evaluation methods in DEA for designing the ERSCN system Through a case study, the applicability of the proposed process is demonstrated, and it performs well regarding identifying the efficient ERSCN systems and can be used as an important tool to design various supply chain network schemes efficiently and effectively.
Keywords: Data Envelopment Analysis; Cross Efficiency Evaluation; Emergency Supply Chain Network.
A Novel Urban Road Management System Based On Data Mining
by Guanlin Chen, Jiapeng Shen, Min Li, Min Jiang
Abstract: With the accelerating process of urbanization in China, new problems and challenges have also emerged in the management of urban roads. In order to apply the data analysis technology to the above problems, we propose a combined forecasting model which can help us to forecast the number of daily cases that will happen in a region over the next few days. Our experimental results show that this model has better predictive ability than other models and can be applied to a variety of situations. Whats more, in order to apply the model to real life, we also develop a novel urban road management system(NURMS) which realizes some useful functions such as prediction of the number of daily cases, inquiry of daily cases, and statistical analysis of historical data. We believe our work will bring effective data support to the management of urban roads.
Keywords: data mining; SVR; BP; ARIMA; urban road management.
Social Commerce Constructs and Consumers' Purchase Intention from Minimalist Brands
by Hadi Zare, Zhan Su, Hooman Abdollahi
Abstract: The social media and online communities have established new platforms for e-commerce by engaging both consumers and corporations in producing new product or services. Moreover, individuals interaction on the cyberspace has evolved e-commerce towards social commerce. On the other hand, business incorporations have found the use of minimalism application in designing, which removes unnecessary aspects, attracts more audience. Therefore, drawing on literature the authors propound a new adopted model to portray a more transparent vision of social commerce. To examine the relationships among the model constructs, an empirical study was organised for this purpose, a survey was designed. In doing so, SEM methodology structural equation modelling (SEM) has been used with Smart PLS 3 software in order to confirm or reject assumptions in the present study is employed to gauge the proposed model.
Keywords: Social Commerce Construct; trust; Purchase Intention; Minimalist Brand; Brand loyalty.
Research On Operation And Maintenance Management Risk Assessment Of Power Communication Network Based On Dematel
by Youxiang Zhu, Anqi Tian, Zhenyu Lu, Si Jie Zhan, Xiaoyong Wang
Abstract: In order to overcome the low accuracy problem of operation and maintenance risk assessment of power grid communication network, this paper proposes a method for operation and maintenance management risk assessment of power communication network based on DEMATEL, which describes the pedigree, business bearing and network association, and analyzes the pedigree of power communication network based on DEMATEL from the perspective of the whole network and subnet, to obtain the point what should be paid attention to in the process of risk assessment. The experimental results show that the accuracy of risk assessment method is close to 100%, and the failure rate is less than 3%, which improves the early warning rate, so that the accuracy of risk assessment, risk assessment rate and early warning rate of operation and maintenance management of power communication network have been improved.
Keywords: DEMATEL; Power communication network; Operation and maintenance; Risk assessment.
Conceptual design of Ergonomic Food truck using QFD-GRA-DSM Hybrid methodology
by K.G. DURGA PRASAD, P. KRISHNA MURTHY, Ch. HIMA GIREESH, K.D.S. SRAVANI
Abstract: As the competition among the food truck business entrepreneurs is growing rapidly in India, food truck owners have to capture the tastes of the consumers from time to time, maintain trained staff for food preparation, create healthy, hygienic environment, ensure quality in service etc. In addition to these, the effective utilization of limited kitchen space to meet all the requirements is essential. In this context, ergonomic intervention in designing kitchen space of the food truck is one of the prime considerations. In this paper, a methodology is developed by using Quality Function Deployment (QFD), Grey relational analysis (GRA) and Design structure matrix method (DSM) for conceptual design of ergonomic food truck with a view to deploy the requirements of users in to the design of kitchen portion of the food truck. The proposed methodology is demonstrated through a case study in this paper.
Keywords: conceptual design of a product; ergonomics; ergonomic food truck; quality function deployment; grey relational analysis; design structure matrix method.
Resonant Automotive Suspension Device Detection Bench Based on Fuzzy Comprehensive Recognition Algorithm (FCRA)
by Xuelian TIAN
Abstract: Testing the suspension device and judging whether it meets the requirements are obviously necessary to ensure the safe driving of the car, especially for small vehicles running at high speed. The testing principle of resonance automobile suspension performance is analyzed theoretically, and the mathematical model is established. Based on this model, the design of testing bench is expounded. In this paper, a detection platform of resonant automobile suspension device based on Fuzzy Comprehensive Recognition (FCRA) algorithm is proposed, which detects the resonant automobile suspension device caused by faults by using the change of fuzzy comprehensive identification coefficient and modal parameters required for output. The experimental results show that the performance of the resonant suspension device test bench is stable and can meet the needs of the performance test of the automobile suspension device.
Keywords: Fuzzy Comprehensive Recognition Algorithm; Resonant Automotive Suspension Device; Detection Bench; Optimization.
Research On High-Speed Motion Control Of Green Environmental Protection Production Line For High-Speed Flexible Cartridge Packing
by Kuiwu Liu
Abstract: In order to overcome the poor track control performance of the production line motion control method, a high-speed motion control method of green environmental protection production line with high-speed flexible box packing is proposed. This method obtains the speed constraint conditions according to the speed connection between the path segments, carries out the speed preprocessing between the path segments, introduces the polynomial quintic interpolation algorithm, plans and generates the motion trajectory, obtains the speed control curve of the production line, implements the path planning, constructs the high-speed motion control model of the production line, and realises the high-speed motion control of the production line. The experimental results show that the interruption of the trajectory control line is the smallest, the controller tends to be stable for 2 s, and the packaging error can be controlled within
Keywords: High-speed flexible cartridge; Packing; Green production line; High-speed motion control;.
A Holistic Perspective of the Sustainable Manufacturing: A Novel Conceptual Approach
by Ibrahim Garbie, Abdelrahman Garbie
Abstract: Sustainability is recently considered the buzzword in manufacturing enviornments Analysis and investigation of sustainability in manufacturing becomes urgent not only from one stream but also from the whole manufacturing streams The main goal of this paper is to explain how to classify sustainability in all streams of manufacturing as a whole (machine components design, manufacturing processes, and manufacturing systems) through identifying the sustainability enablers A framework to analyze the whole manufacturing streams will be illustrated and discussed to identify which enablers are significant in each manufacturing stream and which manufacturing stream is more significant towards whole manufacturing sustainability than others A novel assessment for measuring the manufacturing sustainability will be presented It seemed that the stream of the manufacturing system represented the highest turbulent one due to the diversity and numerous sustainable enablers It was also observed from this analysis and investigation that understanding sustainable manufacturing as a whole is
Keywords: sustainable manufacturing; sustainability/sustainable development; manufacturing process; manufacturing systems; and machine design.
Prognosis of failures due to the abnormal temperature increase of the malt crusher, using ANFIS neuro-fuzzy approach: case study of the flour mill of the breweries of Cameroon
by Sandra NZENEU, KOMBE Timothée
Abstract: In this article, we present a method for predicting malt grinder failures. The objective is to control the evolution of the temperature of the grinding chamber, in order to optimise the availability and reliability of the grinder. The methodological approach is based on the ANFIS neuro-fuzzy network, which offers, in a single tool, precision for non-linear systems. The predicted temperature is classified according to a mode of operation of the equipment. The evaluation of the performance of the prediction and classification systems is characterised respectively by a learning error function of 0.1236 and a classification rate of 79.6%.
Keywords: Artificial Intelligence; Hybrid neuro-fuzzy network; Form recognition; Failure; Prognosis.
Identifying and classifying sustainable supply chain performance indicators: a GRI based multivariate analysis
by Arash Shahin, Ali Goharshenasan, Abbas Sheikh Aboumasoudi
Abstract: This study aims to identify and classify the performance indicators of a sustainable supply chain based on the Global Report Initiative (GRI) standard using multivariate analysis. Marjan Tile Company has been selected for the case study. Performance indicators of the sustainable supply chain have been reviewed and the GRI standard has been selected. Then, the value of each indicator has been measured using a questionnaire filled by the experts of the company. In the next step, the data has been analysed using multivariate analysis and principal component analysis (PCA). Findings on the classification of performance indicators indicated that human rights varied from nine sub-dimensions to three indicator clusters, and the indicators relevant to social dimensions of society scope and social scope of product liability varied from five sub-dimensions to three indicator clusters, implying the maximum and minimum variation of the clusters.
Keywords: Sustainable Supply Chain; Multivariate analysis; Social dimension; GRI standard; Ceramic and tile industry.
Optimization of tensile and compressive behavior of PLA 3-D printed parts using Categorical Response Surface methodology
by Muhammad Abas, Muhammad Waseem, Tufail Habib, Usman Ghani, Muhammad Alam Zaib Khan, Qazi Muhammad Usman Jan
Abstract: Additive manufacturing is gaining momentum in different industries to fabricate complex parts in a short period. However, the fabrication of quality parts with required mechanical strength greatly depends on printing process parameters. So the present study aims to optimize process parameters of 3-D printed Polylactic Acid (PLA) part of improving mechanical strength, namely tensile and compression strength using Response Surface Methodology (RSM). The input printing process parameters are layer height, infill percentage, raster width and infill patterns (i.e. linear, hexagonal and diamond), while the responses are tensile and compressive strengths. Box Behnken array design is applied for experimental runs and also to fit quadratic regression models. Three levels are set for each printing process parameters i.e. layer height (0.1, 0.2, 0.3mm), infill percentage (10, 55,100), raster width (0.4, 0.45, 0.5mm) and infill pattern type (linear, hexagonal, diamond). Effect of printing process parameters on responses are studied using Analysis of variance.
Keywords: Additive manufacturing; fused deposition modelling; 3D printing; Poly-lactic acid; tensile strength; compression strength; analysis of variance; Response surface methodology.
Optimisation Of Dynamic Navigation System For Automatic Driving Vehicle Based On Binocular Vision
by Dongliang Wang, Guodong Yin, Nan Chen
Abstract: Aiming at the problem of low confidence and low success rate of vehicle navigation system, a dynamic navigation system based on binocular vision is proposed and designed. The system is optimised from two aspects: hardware and software. In hardware, binocular vision sensor is added on the basis of traditional system, and the hardware circuit of the system is optimised and modified. In software, accurate road information is obtained by binocular vision technology, and automatic driving route is planned. In the process of automatic driving, the function modules of dynamic driving state detection and vehicle path control navigation, memory and human-computer interaction unit are optimised. The experimental results show that the optimisation system has a 39% improvement in the success rate compared to the traditional navigation system, and the confidence level is improved by 8.06%. It is a navigation system having higher function to achieve success rate and confidence.
Keywords: Binocular vision; Automatic driving; Vehicle navigation; Dynamic navigation; System optimisation.
A Multi-Level Green Reverse Logistics Network Design for Single Manufacturer and Integration of Return Distribution Warehouses in Supply Chain Management
by Mohammad Reza Shahraki, Shima Shirvani
Abstract: This study develops a linear programming model in a closed loop supply chain network including supply, production, distribution, collection, recycling and disposal centres taking into account variables of route, vehicle and volume of the vehicle. Multilevel and multi-product modes are also considered for single manufacturer and integration of return distribution warehouses and processing costs are also taken into account in locations. All modifiable returned goods are shipped to production and distribution centres to be provided to the consumer directly in the logistics process. The purpose of the model is to reduce costs of the green reverse logistics network. The proposed model reduces the cost of transportation according to the vehicle and the route and vehicle size and ultimately reduces the costs of reverse logistics network distribution. An example is reviewed for validation of the proposed model and finally general conclusions are presented. The results show that the proposed model is able to determine the best route, type of vehicle and shipping volume and in the reverse logistics network.
Keywords: reverse logistics; supply chain; return distribution cost; returned products.
MAINTENANCE PERFORMANCE EVALUATION OF BUS FLEET GARAGES USING A HYBRID APPROACH
by Ajith Tom James
Abstract: Availability of automobiles in fleet service is very crucial and is often influenced by the maintenance. Generally, bus fleet organisations have got their own garage facilities. However, the maintenance performance levels of garages need not to be the same with all organisations and locations. Hence, a measurement system is necessary to evaluate the maintenance performance of garages for corrective actions. This paper develops a framework for maintenance performance measurement (MPM) based on MPIs specific to the objectives of fleet service maintenance garages based on hybrid methodology that is a combination analytic hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS). The hybrid methodology is applied for comparing maintenance performance of garages of four different municipal bus fleet services in India. The novelty of this paper includes development of MPIs specific to garages of bus fleet and comparison of the fleet garages based on maintenance performance.
Keywords: fleet service garage; maintenance performance measurement; MPM; analytic hierarchy process; AHP; TOPSIS.
Availability analysis using Markovian approach and Maintenance Planning of a process industry
by Nitin Panwar, SANJEEV KUMAR
Abstract: In the present paper, a probabilistic method for stochastic modelling and performance evaluation of a pulping unit is suggested. The paper plant consists of various units like feeding, pulping system, bleaching system, screening system and paper production system. Pulping unit is one of the paper plants most significant functional units, consisting of five repairable subsystems which are arranged in series. Using Markov process, differential equations are created after drawing transition diagram and these models are then used to discover the pulping units availability by considering the repair and failure information acquired from maintenance personnel. Based upon the various performance values for critical system using analytic hierarchy process (AHP), first the priority weights of the considered criteria are found and ranking of failure causes are performed using vlse kriterijumska optimizacija kompromisno resenje (VIKOR) to find the most critical component.
Keywords: Markovian; stochastic modelling; multi-criteria decision making; MCDM; availability; AHP-VIKOR; maintenance planning.
Yield-level performance of quality dimensions trough T2 charts and multivariate capacity indicators applied to a fumigation services company
by Tomás Fontalvo, Roberto Herrera, Yulibeth Gonzales
Abstract: This research provides a yield-level performance of quality dimensions trough a T-squared control chart and a multivariate capacity indicator to assess the dimensions of the fumigation service. Six Sigma concepts, control charts and multivariate capability indicators were used as the theoretical basis. The research was evaluative, for which all the information regarding the quality dimensions was evaluated in 11 periods of 2019, for which the primary sources associated with the records generated by the fumigation services company were used. As results, the yield level performance was excellent; and the multivariate control chart shows variability in the quality dimensions in the analysed periods; and the multivariate capacity indicator makes it possible evaluate punctually and globally the service quality, showing a good performance. A three-phase method is proposed that allows to evaluate the service dimensions through a periodic, global, longitudinal and multidimensional perspective to guarantee the sustainability of the service quality.
Keywords: service quality; Six Sigma in service; multivariate control charts; multivariate capability indicators; fumigation services.
A Single-Stage Batch Scheduling Model with m Heterogeneous Batch Processors Producing Multiple Items Parts Demanded at Different due dates.
by Nita Puspita Anugrawati Hidayat, Wisnu Aribowo, Abdul Hakim Halim, Andi Cakravastia
Abstract: This research deals with a batch scheduling problem to minimise total actual flowtime of parts through the shop with m heterogeneous batch processors, i.e., the machine simultaneously processing all parts in a batch. The parts to be processed are multiple items, and the completed parts must be delivered at different due dates. The total actual flow time of parts can be defined as an interval between arrival times of the parts and their respective due dates. The objective of minimising the total actual flowtime is not only to satisfy the due dates as a commitment to the customers, but also to minimise the length of total time spent by the parts in the shop. The problem is formulated as a mathematical model and an algorithm to solve the problem is proposed. Numerical examples show that the proposed algorithm can effectively solve the problem.
Keywords: batch scheduling; batch processor; actual flowtime.
Accurate medical information recommendation system based on big data analysis
by Xi Chen, Jieru Wang
Abstract: In order to solve the problems of low recommendation accuracy and long response time in traditional medical information recommendation system, a medical information accurate recommendation system based on big data analysis is proposed. The system is designed as medical information data acquisition module, medical information storage module and medical information accurate recommendation module. In the medical information data acquisition module, crawler technology is used to obtain medical information data, association rule algorithm is used to mine the medical information data, in the medical information storage module, personalised configuration is set, in the medical information accurate recommendation module, the user interest model is quantified by vector space method, and BP algorithm and SOM algorithm are introduced to complete the accuracy of medical information recommend. The experimental results show that: the highest accuracy rate of medical information recommendation is 98.8%, and the shortest retrieval response time is 20 ms.
Keywords: big data technology; medical information; preprocessing; accurate recommendation.
Design Of Energy Consumption Monitoring System Of Public Buildings Based On Artificial Neural Network
by Hui-hua Xiong, Chuan He, Jin Lin, Xin Xiang, LiE Yu
Abstract: In order to overcome the problems of low monitoring accuracy and long response time in traditional energy consumption monitoring system of public buildings, a new energy consumption monitoring system of public buildings based on artificial neural network is proposed. The system hardware is designed by using the energy consumption collection subsystem and energy consumption data transmission subsystem of public buildings. Through the genetic algorithm to optimise the constraint parameters of the physical sign extraction function to obtain the characteristics of public building energy consumption, combined with the main factors affecting the building energy consumption, the public building energy consumption monitoring model based on artificial neural network is established, and the real-time monitoring of public building energy consumption is realised through the model. The experimental results show that, compared with the traditional monitoring system, the minimum monitoring error of the designed system is only 0.01.
Keywords: artificial neural network; public building; energy consumption monitoring system; genetic algorithm.
Research On Energy Consumption Control Method Of Green Building Based On Bim Technology
by Jianhong Xu
Abstract: In order to overcome the problems of large energy consumption control error and low control efficiency in traditional energy consumption control methods, a new energy consumption control method based on BIM technology is proposed in this paper. In this method, RSstudio data mining software is used to mine the energy consumption data of green buildings in CBECS building energy consumption information database to fill the data shortage. Using the orthogonal test method and building information simulation software to analyse the significance level of energy consumption of green building, simulate the energy consumption of green building, based on BIM technology, implement the integrated design of energy consumption control of green building, in order to achieve the energy consumption control of green building. The experimental results show that the proposed energy consumption control method has lower control error and higher control efficiency, and the maximum control error is only 0.44.
Keywords: BIM technology; green building; energy consumption control; energy consumption simulation.
Solar panel selection using an integrated analytical hierarchy process and multi-objective optimization by ratio analysis: an empirical study
by Gnanasekaran Sasikumar, A. SIVASANGARI
Abstract: A solar panel is a vital element of a photovoltaic (PV) system. Hence, it is essential to study the reduction of material costs of a solar panel without compromising the efficiency of it. Selection of solar panel is a complex problem due to the presence of various quantitative and qualitative parameters. This paper deals with the development of a mathematical model by combining analytical hierarchy process (AHP) and multi-objective optimisation by ratio analysis (MOORA) for the evaluation and ranking of solar panels. The AHP method is utilised to fix compromise solution with incommensurable and contradictory criteria, consisting of five potential solar panels and eight selection parameters. The AHP technique is adopted for calculating the criteria weights based on the relative importance. Consequently, MOORA method is used for ranking and selecting the solar panel alternatives. The proposed AHP and MOORA approach is found to be effective for the evaluation and ranking of solar panels as it produces comparable results with VIKOR method. In the VIKOR method, alternatives are ranked based on closeness to positive ideal solution.
Keywords: solar panel; analytical hierarchy process; AHP; multi-objective optimisation; multi-criteria decision-making; MCDM; ratio analysis; VIKOR.
Research on the early warning system of regional financial risk
by Xiaowei Lin, Yaqin Peng
Abstract: It is a systematic research work to design the early warning system of regional financial risk. This paper selects a total of 17 regional financial risk early warning indicators from the aspects of external macro-impact, regional macro-economic and regional micro-finance, and then uses the mapping method, GRITIC method and comprehensive scoring method to deal with the index standardisation, index weight and comprehensive risk measurement respectively, and construct the regional financial risk early warning system. Based on the empirical research of Fujian Provinces actual data, the results show that there are implied fluctuations in the overall stability of regional finance in Fujian Province from 2013 to 2017, but some important early warning indicators still have different levels of risk. Finally, according to the early warning results of Fujian Province, the targeted financial risk prevention measures are put forward.
Keywords: regional financial risk; early warning system; mapping treatment; GRITIC method.
The efficient routing approach of a vehicle under the vehicle routing problem with simultaneous delivery and pickup for reducing the fuel consumption and pollutants emission
by Nilufa Yeasmin, Sultana Parveen
Abstract: The vehicle routing problem with simultaneous delivery and pickup (VRPSDP) has received significant attention in logistics operations to minimize the travelling distance or travelling time. However, little is known regarding the VRPSDP in logistics operations which is used to reduce the emission of CO2 in the environment (i.e., critical requirements of green logistics). Our study proposes the fuel-optimization model for the vehicle under VRPSDP referred to as an eco-friendly VRPSDP model. This model aims to determine the efficient vehicle route that will reduce the vehicle's fuel consumption as well as decrease the negative impact on the environment. The Genetic Algorithm (GA) is applied to solve the proposed fuel optimization model. Here, two types of genetic mutation operator, i.e. swap and inverse are used to find out which one would give the optimum results regarding fuel consumption. The computational tests show that that the inverse mutation performs better than the swap mutation and saves the fuel consumption of 4.1 % over the swap mutation.
Keywords: fuel optimisation; vehicle routing problem with simultaneous delivery and pick up; genetic algorithm; swap mutation and inverse mutation; reverse logistics.
Patient Safety Culture in Al Zarqa Public Hospital: Case Study
by Osama Al-meanzel, Haetham Doweire, Hesham A. Almomani
Abstract: Patient safety concerns vary among healthcare provider settings, cultures of countries, policies and available resources. The primary purpose of this study is to analyse and establish a baseline assessment of the patient safety culture in Al Zarqa governorate hospitals. Hospitalised patients need to receive appropriate and high-quality treatment recommended in accordance with the latest professional knowledge. This study was conducted at two hospitals in Al Zarqa City, Prince Faisal Hospital (Prince Faisal Bin Al-Hussein Hospital) and Al Zarqa New Hospital (Al Zarqa Governmental Hospital). The total number of the participant was 131 from hospitals from 14 departments (59% from Al Zarqa New Hospital and 41% from Prince Faisal Hospital). The results of this study suggest that patient safety culture in Al Zarqa public hospitals needs more attention. The majority of the participant neither agreed nor disagreed on most of the points survey. However, they reported certain events that compromised safety, and at times having communicated with the hospitals about safety issues. Patient safety issues vary according to the setting, local culture, and available resources.
Keywords: patient safety culture; PSC; human safety; quality; healthcare; safety; patient culture.
Sustainable energy strategies for micro, small, and medium enterprises in India: a review
by Jangam Ramesh, M. Mohan Ram, Y.S. Varadarajan
Abstract: Enhancing energy efficiency and conservation will play a significant aspect in the accomplishment of energy requirements in developing economies. To be competitive and sustainable, micro, small, and medium enterprises (MSMEs) have to utilise energy input sources optimally and effectively to enhance overall productivity. Sustainable energy strategies (SES) focus on the economical use of energy sources and examine the parameters that influence energy utilisation in enterprises. This review aims to fill energy gaps and update the literature review in industries through SES, highlight the current research concerning the future scope of sustainability in MSMEs. In this review paper, we explored the sustainable energy strategies (SES), it included the initiation of various practices and policies that decline energy demand through energy efficiency measures, the role of technological capabilities, examine the factors influencing and barriers to energy efficiency that are believed to enhance productivity and sustainability in MSMEs. The motivation for the review paper focused on considering the better strategies that are needed to improved forecasting techniques and assist in the development of sustainability in MSMEs.
Keywords: energy efficiency; energy intensity; sustainability; productivity; MSMEs.
Optimal delivery and replenishment policies for perishable products considering lost sale cost: an efficient hybrid algorithm
by Mahla Babagolzadeh, Mohammadali Pirayesh, Anup Shrestha
Abstract: In today's competitive global market, improving the quality of customer service and waste reduction are two important factors to maximise the profits of a system. These goals can be achieved throughout well-managed logistical operations such as proper inventory management and timely delivery of perishable items to customers. This paper presents an integrated mathematical model that schedules replenishment of a perishable product to determine delivery routes, truck loads and inventory levels, where the vehicle arrival time has a direct impact on the quantity of the product delivered to customers. Given the NP-hard nature of the problem, finding optimum or near optimum solutions in polynomial time is challenging, therefore a hybrid algorithm based on a linear programming model and a simulated annealing algorithm is developed to solve the problem efficiently. The proposed method achieves a solution near-optimal solution in an efficient computational time. Finally, an analysis is carried out to verify the effectiveness of the algorithm.
Keywords: inventory-routing problem; IRP; lost sale cost; hybrid algorithm; perishable product.
ERP-based lean systems and their impact on performance: the system dynamics approach for a maturity model
by Dung Ho, Arun Kumar, Nirajan Shiwakoti
Abstract: There are continuing debates on the effects of enterprise resource planning (ERP) and its combination with lean on manufacturing performance. It is suggested to integrate lean production principles into ERP systems; however, research exploring this area in the literature is limited, especially quantitative studies. This study fills the knowledge gap by quantitatively investigating the correlation between ERP-based lean systems and performance outcomes, using a system dynamics approach. We model a manufacturing system, focusing on the effects of ERP and lean inputs on customers' order fulfilment. Different scenarios of ERP systems supporting lean practices are illustrated through a capability maturity model. Actual performance data is collected to validate the developed model. The results show that ERP is a hindrance on lean at the low maturity level. The influence on ERP only occurs with the mediator role of lean. ERP-based lean systems bring substantial benefits to organisations. Therefore, lean practices are a foundation upon which the full benefit of ERP can be received.
Keywords: system dynamics; lean; enterprise resource planning; ERP; maturity model; performance.
Optimising unrelated parallel machine scheduling in job shops with maximum allowable tardiness limit
by Parsa Kianpour, Deepak Gupta, Krishna Krishnan, Bhaskaran Gopalakrishnan
Abstract: Motivated by the practical scheduling problem of job shops, this study evaluates unrelated parallel machine scheduling models. The researchers proposed a new mixed integer linear programming model considering effects of maximum limit on the allowable tardiness. An efficient solution technique was developed in MATLAB to minimise computational time. The model was validated using real-life data from local aircraft industry. It was shown that the proposed model leads to lower cost compared to the current models (i.e., without any limit on tardiness) in the literature. In addition, reduction in computational time enables corporate scheduling staff to use the model efficiently.
Keywords: job shop; scheduling; unrelated parallel machines; tardiness; earliness; inventory cost; penalty cost.
Capacity planning with outsourcing opportunities under reliability and maintenance constraints
by Mohammed Haoues, Mohammed Dahane, Kinza Nadia Mouss
Abstract: This paper investigates capacity planning with outsourcing under reliability-maintenance constraints. The considered supply-chain consists of a single-manufacturer and multiple-subcontractors. The manufacturer's company is composed of a single unit subject to random failures. Corrective maintenance is endorsed when failures occur, and preventive maintenance can be carried out to reduce the degradation. The high in-house costs and the incapacity motivate the manufacturer outsourcing to independent subcontractors. In addition, based on the principle of comparative advantage, the manufacturer balances between in-house capacities and outsourcing services, which minimises the total cost. The aim is to propose a new policy based on the combination between integrated-maintenance and outsourcing policies. A mathematical model and an optimisation procedure have been developed in order to determine the best in-house production-maintenance and outsourcing plans for the manufacturer while minimising the total cost. In order to show the applicability of our approach, we conduct experimentations to study the management insights.
Keywords: capacity planning; in-house capacity; integrated maintenance; outsourcing; genetic algorithms.