Template-Type: ReDIF-Article 1.0 Author-Name: Anthony S. White Author-X-Name-First: Anthony S. Author-X-Name-Last: White Author-Name: Michael Censlive Author-X-Name-First: Michael Author-X-Name-Last: Censlive Title: Analysis of the robustness of a single-tier pipeline inventory model Abstract: This paper examines the conditions necessary to specify a robust element of a supply chain using control theory and proposes a new robustness criterion clearly separating robustness from resilience. Algebraic analysis, using the Mikhailov criterion to determine robustness, yields simple criteria for an automatic pipeline with variable inventory and order-based production control system (APVIOBPCS) model. Models implemented with either exponential delays or finite delays are found to be completely robust. A new robustness measurement criterion is defined and applied to a case study of RAM manufacture. Results show that the continuous model of an APVIOBPCS system with an exponential delay has a wider allowable range of process delay time than other models and the range of permissible delay is sufficient to cope with a substantial increase in process delay time while retaining adequate performance and stability. Use of nonlinear inventory generally reduces the robustness range. The techniques used here can also determine the effects of other parameters on robustness. Journal: Int. J. of Inventory Research Pages: 339-362 Issue: 4 Volume: 5 Year: 2020 Keywords: robustness; APVIOBPCS; control theoretic models; continuous system; discrete system; Mikhailov criterion. File-URL: http://www.inderscience.com/link.php?id=109779 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijires:v:5:y:2020:i:4:p:339-362 Template-Type: ReDIF-Article 1.0 Author-Name: Nirakar Niranjan Sethy Author-X-Name-First: Nirakar Niranjan Author-X-Name-Last: Sethy Author-Name: Nini Maharana Author-X-Name-First: Nini Author-X-Name-Last: Maharana Author-Name: Ameeya Kumar Nayak Author-X-Name-First: Ameeya Kumar Author-X-Name-Last: Nayak Author-Name: S. Swayamjyoti Author-X-Name-First: S. Author-X-Name-Last: Swayamjyoti Title: Inclusion of two-warehouse production prototype for deteriorating inventory items in payments Abstract: In this study an inventory model is proposed for deteriorating items considering two separate warehouses, as own warehouse (OW) of finite dimension and the rented warehouse (RW) for keeping the extra elements higher than the specified accommodation of the OW in practice. A lower deterioration rate is provided by the RW compared to OW due to its better preserving amenity. Also, the holding cost per unit in OW is lower compared to RW. In this paper an inventory model is considered for deteriorating items with inclusion of a two-warehouse management with linear demand rate and delay in payment. The objective of this work is to obtain the best fit replenishment strategies with minimisation of the total inventory cost. Numerical experiments are conducted with the developed mathematical model considering various parameters such as order, units and year. A sensitivity analysis is made to obtain optimal solutions with the change of parametric values with time. Journal: Int. J. of Inventory Research Pages: 318-338 Issue: 4 Volume: 5 Year: 2020 Keywords: inventory management; two-ware house; replenishment strategies; sensitivity analysis. File-URL: http://www.inderscience.com/link.php?id=109785 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijires:v:5:y:2020:i:4:p:318-338 Template-Type: ReDIF-Article 1.0 Author-Name: M. Dhivya Lakshmi Author-X-Name-First: M. Dhivya Author-X-Name-Last: Lakshmi Author-Name: P. Pandian Author-X-Name-First: P. Author-X-Name-Last: Pandian Title: A production stock model for a distributed deteriorating product with both price and time dependent demand rate under inflation and late paying allowing shortages Abstract: This paper develops a production stock model for deteriorating products with shortages under the effect of inflation and late paying in which demand is a function of selling price and time. In this article, the model is considered with different deterioration distributions and various time dependent holding costs. This model aids in maximising the total inventory cost by finding the two production periods, the consumption period and the shortage period. Numerical example is presented to understand the developed model. Also, the effect of changes in different parameters on the optimal total cost is graphically presented. Journal: Int. J. of Inventory Research Pages: 284-317 Issue: 4 Volume: 5 Year: 2020 Keywords: inventory model; production; deterioration; shortages; inflation; permissible delay in payments; total profit. File-URL: http://www.inderscience.com/link.php?id=109786 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijires:v:5:y:2020:i:4:p:284-317 Template-Type: ReDIF-Article 1.0 Author-Name: R.P. Tripathi Author-X-Name-First: R.P. Author-X-Name-Last: Tripathi Author-Name: Sachin Mishra Author-X-Name-First: Sachin Author-X-Name-Last: Mishra Title: Innovative approach of stock-linked demand dependent production inventory model with decline deterioration Abstract: In this paper, a production inventory model is considered for stock-dependent demand with the effect of deterioration. Generally, every industrialised organisation wants to produce perfect quality commodities. However, due to real-life problems (raw material, political problem, labour problem, machine breakdown, lock off, etc.) products produced by manufacturing process are not having perfect quality. Damage, deterioration, spoilage also affect the production process. In this model, production rate is considered to be larger than demand rate. Mathematical formulation is presented to locate best possible cycle time and entire inventory cost. Numerical examples and sensitivity analysis are provided to authenticate the model projected in this study. Graphical illustrations are provided to discuss the optimality of the model. Journal: Int. J. of Inventory Research Pages: 251-262 Issue: 4 Volume: 5 Year: 2020 Keywords: stock-linked demand; deterioration; production; inventory; cycle time. File-URL: http://www.inderscience.com/link.php?id=109787 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijires:v:5:y:2020:i:4:p:251-262 Template-Type: ReDIF-Article 1.0 Author-Name: Kuangnen Cheng Author-X-Name-First: Kuangnen Author-X-Name-Last: Cheng Author-Name: Hui-Ping Chen Author-X-Name-First: Hui-Ping Author-X-Name-Last: Chen Title: Location pricing to effectively reduce inventory repositioning: the car rental industry Abstract: Inventory repositioning or pooling to efficiently align demand and supply is a strategic tool widely used in the car rental industry. This technique produces optimal results when demand is negatively correlated between locations within a pool. In practice, effective pricing decisions are expected to complement capacity adjustment, so activities of inventory repositioning can be minimised. Although matching demand increases profit, inventory repositioning unavoidably increases cost; thus, this investigation explores a different aspect of inventory repositioning, namely, effectiveness. The study utilises live pricing data from the US car rental industry, an industry where price is a major differentiator in the market, to detect whether any unwarranted inventory repositioning activity can be removed. Hypotheses are formulated to test whether discrete pricing between weekdays and weekends indeed exists within each pool. Consequently, if rivals do not follow this dogma of discrete pricing strategy, then there must be some invaluable insights. This exploration reveals numerous unforeseen factors such as the size of a rival, the volume of the demand, the destination character (leisure vs. business city) and a constant exorbitant daily rental rate, etc., make inventory repositioning ineffective. Ultimately, an effective repositioning model is proposed. Journal: Int. J. of Inventory Research Pages: 263-283 Issue: 4 Volume: 5 Year: 2020 Keywords: car rental industry; complementary demand; dynamic pricing; flexible capacity; inventory repositioning. File-URL: http://www.inderscience.com/link.php?id=109791 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijires:v:5:y:2020:i:4:p:263-283