International Journal of Mobile Communications (29 papers in press)
Effects of Personal Innovativeness on Mobile Device Adoption by Older Adults in South Korea: The Moderation Effect of Mobile Device Use Experience
by Misook Lee
Abstract: This paper examines mobile device adoption by older adults in South Korea, one of the fastest ageing countries in Asia. It is important to understand how older adults perceive the use of mobile devices and the extent of their intention to continuously (or newly) use them. This paper includes personal innovativeness in the technology acceptance model (TAM) to better investigate mobile device use among older adults. The research model was empirically analysed using structural equations modelling (SEM). The results show that: 1) perceived ease of use (PEOU) and perceived usefulness (PU) partially mediate the relationship between personal innovativeness (PI) and behaviour intention (BI); 2) perceived ease of use (PEOU) has a stronger effect on behaviour intention (BI) than perceived usefulness (PU) does; 3) the use experience of mobile devices plays a moderating role in several paths of the proposed model; 4) invariance analysis reveals interesting and unexpected results.
Keywords: older adult; personal innovativeness; mobile device; technology acceptance model;; mediation effect; moderation effect.
Revisiting Quick Response (QR) Code Technology: Corporate Perspectives
by Sandipan Sen, Ricard A. Rocco, Sampathkumar Ranganathan, John R. Brooks, Jr.
Abstract: Quick response code (QRC) technology is facing various impediments to its adoption and usage. It has an uncertain future amidst an evolving landscape of technology and social tools available to companies. This study examines QRC's utilising marketing executives to gain current insights on its present use as well as future direction. A mixed methods survey was used to capture qualitative and quantitative responses from corporate marketing executive perspectives about QRC. Executives view QR codes primarily as a technology to increase both strategic advantage and communication advantage with customers. The findings suggest QRC will evolve as an important technology to support future corporate marketing and sales efforts.
Keywords: Technology in retailing; retail marketing; marketing communications; Mcommerce; QR codes; Technology adoption; Innovation; Online marketing; mobile marketing; content marketing; new media.
Multi-view Video CODEC Using Compressive Sensing for Wireless Video Sensor Networks
by Angayarkanni Veeraputhiran, S. Radha, V. Akshaya
Abstract: In monitoring applications, different views are needed to be captured by multi-view video sensor nodes for understanding the scene clearly. These multi-view sequences have large volume of redundant data which affects the storage, transmission, bandwidth and lifetime of wireless video sensor nodes. A low complex coding technique is required for addressing these issues and for processing multi-view sensor data. Hence, in this paper, a framework on CS-based multi-view video codec using frame approximation technique (CMVC-FAT) is proposed. Quantisation with entropy coding based on frame skipping is adopted for achieving efficient video compression. For better prediction of skipped frame at receiver, a frame approximation technique (FAT) algorithm is proposed. Simulation results reveal that CMVC-FAT framework outperforms the existing method with achievement of 86.5% reduction in time and bits. Also, it shows 83.75% reduction in transmission energy compared with raw frame.
Keywords: Multi-view encoding; CS; DVC; Frame approximation; Wireless Video Sensor Networks.
Does a difference in the number of response categories change the results for ACSI in the mobile phone sector?
by Cetin Kalburan, Selcuk Burak Hasiloglu, Ahmet Bardakci
Abstract: This study aims to contribute to making customer satisfaction measurement more efficient in the mobile phone sector. For this purpose, data were collected from 3,342 mobile phone users living in five different cities in Turkey. A self-administered questionnaire was used in this study. Five different surveys were used, with the same questions but with different categories of response (4-, 5-, 6-, 7-, and 10-point scales). The research instrument items were adapted from the American customer satisfaction index (ACSI). With the dataset of each response category, the models were installed and subsequently compared. The originality of the study is due to the comparison of the models created with different datasets. According to the findings obtained, different response categories did not make a considerable difference in the measurement of customer satisfaction.
Keywords: customer satisfaction; American Customer Satisfaction Index; response categories; mobile phone sector.
An integrated model of the antecedents and consequences of perceived information overload using WeChat as an example
by Liang Ma, Xin Zhang, Gao Shan Wang, Ge Zhang
Abstract: In recent years, more and more social media users have complained of information overload. In this paper, we obtained data from surveys of users of the multi-purpose Chinese social website, WeChat, to develop an integrated model of information overload. The model was used to determine the antecedents and consequences of WeChat users' perceived information overload. A field survey of 244 WeChat users was conducted to test the research model and hypotheses. The results showed the following key findings: 1) the amount of information received and the length of content increased users' perceptions of information overload, while the number of WeChat subscriptions followed was not a significant factor; 2) users' perceptions of information overload were associated with negative emotions and increased intention to discontinue usage; 3) the type and severity of negative emotions and consequent likelihood of discontinuing usage will vary according to the users' different levels of experience. The implications of our results for researchers, website managers and psychosocial practitioners are discussed.
Keywords: perceived information overload; number of subscription follow; amount of information received; length of information; negative emotion; discontinuous usage intention.
Factors influencing the purchase of travel insurance over mobile banking
by Chi-Hsuan Lin, Kuang-Hsun Shih, Wei-Chuan Wang, Lee-Fen Chuang, Wei-Chun Tsai, Chung-Fu Huang
Abstract: By adopting the Davis's technology acceptance model and introducing the variables of system quality, information quality, and service quality from the information system success model, this study's purpose is to combine these two models to explore the factors that influence consumers to purchase travel insurance through the mobile banking system. In our entire study process, total 300 survey questionnaires were collected, approaching a response rate of 100%. Due to the insufficient number of samples and this is a new issue, it may lead to insufficient statistical analysis. Moreover, the number of valid questionnaires was 261, approximately 87% of the response rate. Research results show the following: in our hypothesis test, only one of the 12 hypotheses is not valid. Last, the study provides recommendations and directions for the financial industry to use as reference when promoting mobile banking operations in the future.
Keywords: Technology Acceptance Model; Information System Success Model; Mobile Banking; Structural Equation Modeling (SEM).
Exploring factors affecting the adoption of Mobile Payment at physical stores
by Lin Wang, Xuefeng Dai
Abstract: This study develops and empirically tests a research model to comprehensively examine factors influencing the adoption of mobile payment at physical stores. In particular, this study proposes an integrated theoretical framework that combines the theory of technology acceptance model (TAM) and unified theory of acceptance and use of technology (UTAUT). The results indicate that: attitude is the most important factor influencing users intention to adopt offline mobile payment compared to perceived usefulness and social influence; personal innovativeness, perceived usefulness and promotional offer also have significant effects on attitude whereas the perceived ease of use is not as important as others but does with significant effect on perceived usefulness.
Keywords: Offline mobile payment;Mobile commerce;Technology acceptance model;User acceptance.
Customer Resistance to Churn in a Mature Mobile Telecommunications Market
by Younghoon Chang, Seungyeon Kim, Siew Fan Wong, Myeong-Cheol Park
Abstract: Effective customer retention is critical for company survival, especially in a mature mobile telecommunications market. To build on customer retention research, we propose an integrative model capturing the dual relational mechanisms that explain customer resistance to churn. We empirically test the model using data from 815 subscribers who have stayed with their mobile network operators for more than three years. The results show that two contrasting mechanisms, dedication-based and constraint-based relationships, simultaneously determine customer resistance to churn. The constraints of procedural, financial, and relational costs significantly influence perceived risk, while dedication factors of economy-based and identification-based trust significantly influence commitment.
Keywords: resistance to churn; customer retention; constraint-based relationship; dedication-based relationship.
A Multi-Modal Approach for Evaluating Player Experience on Different Gaming Platforms
by Yavuz Inal, Kerem Rızvanoğlu, Çakır Aker
Abstract: The aim of this experimental study was to adopt a multi-modal approach to analyse player experience on PC and mobile gaming platforms, and identify both the factors that potentially have an effect on this experience and the set of methods that are effective on measuring it. Game experience questionnaire was enriched through usability scales, semi-structured interviews and player observations. Data was collected from 20 undergraduate university students that were selected from casual gamers that had never played the Plants vs. Zombies game before. Results of the study showed that participants who played on the PC platform declared more positive feelings when compared to the players of the mobile platform. The bivariate correlations between the game experience items on each platform showed that flow, competence, and challenge were the marker components of game experience that differed due to the players' game experience on each platform.
Keywords: Player Experience; Mobile Games; Gameplay; Game Usability; Gaming Platforms; Multi-Modal Approach.
UNDERSTANDING THE FACTORS AFFECTING CONSUMERS CONTINUANCE INTENTION IN MOBILE SHOPPING: THE CASE OF PRIVATE SHOPPING CLUBS
by Mehmet Cem Bölen, Üstün Özen
Abstract: This study aims to determine the factors affecting the continuance intention in using mobile shopping apps and websites. Within the scope of the study, a research model is proposed that integrates an information systems (IS) expectation-confirmation model (ECM), flow theory, and trust. Structural equation modelling (SEM) was employed to analyse data collected from 518 users of the most popular private shopping clubs in Turkey. The results revealed that the variables of perceived usefulness, satisfaction, and enjoyment directly and significantly affected the consumers' continuance intention in using the private shopping clubs' mobile apps and websites. The focus dimension of the flow experience was not found to have a significant effect on either consumer satisfaction or continuous usage intention. Another interesting result of the study is that, contrary to the general belief in the literature, the trust dimension does not have a significant effect on consumers' continuance intention.
Keywords: Mobile shopping; Private shopping clubs; Expectation confirmation model; Flow theory; Trust.
MULTIMODAL SYSTEMS FOR SPEECH RECOGNITION
by Orken Zh. Mamyrbayev, Dinara Mussayeva, Bagashar Zhumazhanov, Farida Gusmanova, Keylan Alimhan, Beibut Amirgaliyev
Abstract: In this article, we have implemented a system of multimodal recognition of Kazakh speech, based on speech and lip recognition. During the feature extraction phase, several methods have been used, such as voice activity detection (VAD), mel-frequency cepstral coefficients, perceptual linear prediction, relative perceptual linear prediction, and their first-order time derivatives. The main problems of recognition of Kazakh speech, VAD algorithms and speech segmentation, lip movement recognition are considered in the article. The description of probabilistic modelling of audiovisual speech based on coupled hidden Markov models (HMMs), information fusion methods with weight coefficients for audio and video speech modalities, and parametric representation of signals is provided. Quantitative results in multimodal recognition of continuous Kazakh speech indicate high accuracy and reliability of the automatic system. This approach has been used and compared in terms of computational time and recognition speed and gives very interesting results.
Keywords: VAD; speech segmentation; multimodal systems; speech recognition; information systems.
Effects of Virtual Reality News on Knowledge Gain and News Attitudes
by Yoori Hwang, Se-Hoon Jeong, Sonho Kim, Jung-Yoon Yum
Abstract: This research examined the effects of virtual reality (VR) news on knowledge gain and news attitudes. This study found that compared to non-VR news, VR news could have a negative impact on knowledge gain, whereas it could have some positive effect on news attitudes. The positive effect on news attitudes was only found with a more experience-related news topic (i.e., travel sites in Rio de Janeiro), but not with a less experience-related news topic (i.e., new surgical procedure for pancreatic cancer). The positive impact of VR on news attitudes was mediated by presence and subsequent enjoyment.
Keywords: Keywords: virtual reality (VR); news; journalism; knowledge; attitudes.
Use of social networking applications (SNAs) by immigrant children, adolescents, and young adultsto maintain contact with those who remained in the country of origin: Usage characteristics and habits
by Zilka Gila
Abstract: In the present research, we examined the use and its influence of social networking applications on the process of young immigrants' acclimatisation in Israel, given the widespread use of such applications by children, adolescents, and young people to maintain contact with those who remained in their country of origin. This is a mixed-method study. A total of 551 participants from Israel completed questionnaires, of whom 110 were also interviewed. Interviewees were asked to clarify the quantitative findings to help gain in-depth understanding of the factors affecting acclimatisation. The semi-structured interviews covered all the topics included in the research questionnaires. The interviewees wanted to share positive and negative experiences they lived through, and some provided detailed descriptions. The study found that participants feel that communication alleviates the sense of longing, enables intimate discourse, sentiment sharing, release of anger, and relief of frustration. The use of web applications encourages significant interactions with those who remained in the country of origin, but to a certain extent causes social isolation in the new country.
Keywords: Internet communication applications; social networking; WhatsApp; social development; immigrants.
What customers want from smart devices: Investigating explicitly judged and implicitly derived success factors
by Kyungdoh Kim, Robert W. Proctor, Chang-Soo Ok
Abstract: Smart devices are gaining popularity, and success of such products requires understanding customer requirements. To investigate success factors of smart devices, we conducted two survey studies regarding cell phones, tablet computers, and laptop computers. First, we determined explicit judgements of success factors through pairwise comparison of various factors. Second, we derived success factors implicitly by having users evaluate their own smart devices. Finally, we compared these two results and finalised the success factors for smart devices, which include the following. People want to repurchase innovative smart devices with good design. Products with competitive advantage and good usability that meet customer needs are recommended by individuals who have used them. Also, products with good market conditions will typically succeed.
Keywords: smart device; product success; success factor; competitive advantage; innovativeness.
What drives students online self-disclosure behavior on social media? A hybrid SEM and artificial intelligence approach
by Ibrahim Arpaci
Abstract: This study investigated drivers of the online self-disclosure behaviour on social media by employing a complementary structural equation modelling (SEM) and artificial intelligence approach. The study developed a theoretical model based on the 'theory of planned behaviour' (TPB) and 'communication privacy management' (CPM) theory. The predictive model was validated by employing a multi-analytical approach based on the data obtained from 300 undergraduate students. The model focused on the role of security, privacy, and trust perceptions in predicting the attitudes toward the selfie-posting behaviour. The results suggested that privacy and security are significantly associated with the trust, which explains a significant amount of the variance in the attitudes. Consistently, results of the machine-learning classification algorithms suggested that attributes of the security, privacy, and trust could predict the attitudes with an accuracy of more than 61% in most cases. Further, mediation analysis results indicated that privacy has no direct effect, but an indirect effect on the attitudes. These findings suggested a trade-off between the privacy concerns and perceived benefits of the actual behaviour.
Keywords: Social media; self-disclosure; trust; artificial intelligence; machine learning.
A Comparative Analysis and Performance Evaluation of Web Application Protection Techniques against Injection Attacks
by Nabeel Salih Ali, Ahmed Hazim Alhilali, Mohammed Falih, Salam Kadhim, Hayder K. Fatlawi, Abdul Samad Bin Shibghatullah
Abstract: Nowadays, most animation activities are based on internet-enabled applications. But, the majority of web developers have ignored the privacy and security aspects of each application, turning them into attractive targets for security issues and therefore increasing the attacker's concerning. Structured query language injection attack (SQLIA) is the prevalent and dominant type of severe web application attacks. This paper provides a comparative study for web application protection techniques and evaluates their performance against SQLIA by conducting a detailed review of various SQLIA previously detected and prevented by protection techniques, a summary and analysis of a critical review of the defensive techniques that were done to address such attack, performance comparison of the different protective approaches through an evaluation using performance metrics to identify efficient and high-performance techniques. Finally, the paper highlights and focuses on the critical and vital directions or protection approaches that require more studies by future research.
Keywords: Web applications; SQL injection; Protection techniques; Detection and prevention; Performance evaluation; Web attacks; Defensive approaches; Defensive tools; Injection; Web security; Protective method.
A Longitudinal Study on the Effects of Motivational Mobile Application Uses on Online News Engagement
by Ji Won Kim, Sunyoung Park, Yoonmo Sang
Abstract: Based on four-wave panel data, this study explored the relationships between different uses of motivational mobile applications and online news engagement. Three motivational mobile application uses informational, recreational, and relational were identified and rank-ordered according to respondents everyday mobile application preferences. Results showed that only relational mobile application use had positive relationships with online news engagement. Results further indicate that over the four-year period examined (20132016) only the use of relational mobile application led to continuous growth of online news engagement. This study advances the literature on mobile communication not only by introducing results of a longitudinal study that challenge and support conflicting previous findings but that also provide support for the possibility of the mobile facilitation hypothesis.
Keywords: Mobile Facilitation Hypothesis; Four-Wave Panel Survey; Structural Equation Modeling; Mobile Application; Informational Use; Recreational Use; Relational Use; Online News Engagement.
Examining Academic Landscape of Mobile Banking
by Hai-Yen Chang, John S. Liu, Ching-Wen Lin, Vincent C. Ma
Abstract: This study aims to identify trends in mobile banking (MB) research by reviewing influential academic articles. We adopted content analysis as a qualitative methodology and main path analysis as a quantitative methodology, to portray the development of MB research over the period from 1990 to 2016. We identified 14 highly influential articles in the evolution of MB literature. We found that the majority of the articles were written in an Asian context. The predominant theme shifted from MB adoption to the impact of MB on the effectiveness of individual lives. The primary concern of MB users changed from risk to usefulness, especially among the young users. The implications for financial institutions include focusing on consumer lifestyle, monitoring security measure and communicating to college students as the main potential customers.
Keywords: mobile banking; main path analysis; content analysis; technology acceptance model.
Investigating the adoption intention of gamification apps on mobile services
by Tony Cheng-Kui Huang, Ya-Wen Lee, Shin-Horng Chen
Abstract: Previous studies exploring adoption in the field of management information systems have focused on the objects of information systems or information technologies. However, since the popularity of smart phones has led to the usage of apps, limited investigations have attempted to understand the usage intention of apps. In this study, a research model is proposed to comprehend how users perceive and adopt a gamification app in the initial adoption phase of the information system life cycle. Since there are various topics within gamification services, we only pinpoint one popular type of service, exercise, as the research subject. The investigation involving 173 usable subjects was conducted to evaluate the model by using structural equation modelling. The result demonstrates that our proposed model explains 56.7% of the variance. The findings have interesting implications with respect to the initial usage of exercise gamification apps, both for researchers and practitioners.
Keywords: Gamification; Technology acceptance model; Initial usage; Individual level; Exercise.
Understanding users intention to switch mobile instant messaging
by Shuang Cheng, Sang-Joon Lee
Abstract: In recent years, mobile instant messaging (MIM) has become increasingly popular and has integrated in the daily lives of millions of people worldwide. Previous studies on MIM have primarily focused on its initial adoption and continuance usage, while paying less attention to switching behaviour. This study aims to explore the key factors influencing users switching intention of MIM in China, using the push-pull-mooring (PPM) framework of the migration theory, and empirically examine the three types of predictors for MIM switching intention: push (fatigue), pull (referent network size, future expectation, complementarity, and transfer trust), and mooring (switching cost) factors. Our results indicated that all of these factors have significant effects on switching intention. The results yield both theoretical and practical implications.
Keywords: mobile instant messaging; fatigue; network externality; transfer trust; switching cost; switching intention; push-pull-mooring framework.
A simple and portable add on converter module for communication and measurements
by Dinesh Kumar, Majo Mary Mathew, Madhusoodanan Kottarathil Naduvil
Abstract: This paper presents the development of a new versatile portable add-on converter module which can be used for analysing mobile communication and cable TV networks. Present testing techniques required separate test equipment for characterising electrical and optical networks. Here, we develop a new system work as an add-on module for electrical frequency domain reflectometer which can perform measurements in electrical as well as optical cable networks. Using this technique, millions of electrical cable analyser currently in use all over the world can be converted into the optical analyser. The same system can also be configured as a bidirectional communication system for a wide variety of applications like fibre to the antenna/fibre to the home, cable TV applications. We also show that the developed system has wideband performance over a frequency range from 800 MHz to 2.5 GHz and a dynamic range of 45 dB.
Keywords: Converter module; electrical frequency domain reflectometer; radio over fiber; single-mode fiber; multimode fiber.
Relationship Quality, Computer auditing and information security for mobile industry
by Ching-Wen Lin, Tung-Hsien Wu, Shaio Yan Huang
Abstract: Research has primarily focused on the security aspect of mobile communication for computer auditing research in the mobile industry. Few studies have examined the role of computer auditing on the mobile industry. Therefore, the current study investigated the mediating effect of computer audit on the correlation between relationship quality and information security by conducting a survey using the partial least-squares method. Computer audit directly influenced internal auditing performance, and relationship quality indirectly influenced information security through computer audit. Therefore, determining how sound computer auditing can be conducted is crucial for the internal audit department.
Keywords: CAATTs; computer auditing; mobile industry; performance.
A survey of what customers want in smartwatch brand applications
by Kyungdoh Kim, Kyeongjin Park, Meuel Jeong
Abstract: This research explores how smartwatch brand apps can be used to advertise companies and brands. A survey was conducted to analyse the utilisation of the brand app in smartwatch, and a total of 134 data were collected. Study 1 discovered the external factors that influence intention to use and tracked the relationship between factors using technology acceptance model. The results of the structural equation model analysis showed that the ease of use had a significant positive impact on the intention to use and the complexity and financial risk had a statistically negative impact on the intention to use. Study 2 investigated what types of smartwatch brand apps users would use. As a result of analysis of variance, music, weather information, basic telephone function, SNS, navigation, basic SMS, productivity, and health showed higher use intention. Types with low intentions were e-books, games, sports, entertainment, QR code/barcode recognition, finance, photography and video.
Keywords: Smartwatch; Advertisement; Brand app; Intention to use; TAM.
The impact of trust, security, and privacy on individual's use of the internet for online shopping and social media: a multi-cultural study
by Khaled A. Alshare, Murad Moqbel, Mohammad A. Al-Garni
Abstract: This paper examines through the lens of expectancy-valence theory the impact of trust, privacy, and security on the decision to use the internet for online shopping and social media. It also investigates the moderating impact of Hofstede's cultural dimensions on the hypothesised relationships. The comparative analysis of 302 surveys from users in the USA and Qatar revealed that trust in internet technology and trust in vendors are the strongest two factors in making decisions to use the internet for online shopping and social media. The results indicated that the cultural dimensions moderated the hypothesised relationships. Surprisingly, Qataris respondents, compared to US respondents, were more influenced by privacy concerns when making decisions to use the internet for online shopping or social media. Implications for researchers and practitioners are reported.
Keywords: trust; security; privacy; social media; online shopping; expectancy-valence theory; Hofstede's cultural dimensions.
Development of software-based vendor independent WLAN controller
by Mehmet Ali Ertürk, Luca Vollero, Muhammed Ali Aydın
Abstract: Wireless hotspots have become popular, due to their ability to provide inexpensive and easy-to-deploy network infrastructures. Controlling and maintaining large-scale wireless infrastructures with traditional methods is complex and error-prone. Hence, it is necessary to use centralised solutions to handle configuration, monitoring and management functions in large-scale wireless hotspots. Existing solutions solve these problems within their hardware ecosystems and are constrained by vendor being depended on hardware and software restrictions. In this study, we propose and evaluate a wireless local area network (WLAN) access point (AP) controller built on top of a standard WLAN management protocol and free of any particular hardware and software restrictions. The proposed WLAN controller is a software component based on the control and provisioning of wireless access points (CAPWAPs) protocol. The proposed controller is evaluated by means of a TestBed including a variety of WiFi devices from different vendors to solve a QoS-LB problem.
Keywords: wireless LAN controller; access controller; control and provisioning of wireless access point; CAPWAP; QoS IEEE 802.11.
Examining the impact of mobile app features on impulsiveness: the moderating role of 'pay-more-get-more' promotion
by Sanjeev Prashar, Priyanka Gupta, Chandan Parsad, T. Sai Vijay
Abstract: With the exponential growth of smart phone users, mobile applications (apps) have become an essential platform for electronic retailers. Considering the research gap in the existing literature on shoppers' impulsiveness in the context of mobile medium, the present study investigates the effect of various antecedents in triggering impulsiveness in mobile apps shopping and inducing continuous purchases. The pioneer study used the structural equation modelling to test the hypothesised research model. It is observed that antecedents like effort expectancy, apps atmosphere, user experience and user satisfaction, price and discount have influence on impulse buying intention of shoppers. The study also confirms the moderating role of 'pay-more-get-more' promotional offers. The paper concludes with theoretical and managerial implications.
Keywords: mobile application; impulse buying intention; effort expectancy; apps atmosphere; user satisfaction; user experience.
An empirical examination of adoption of mobile applications in Spain and Portugal, based in UTAUT
by Pedro R. Palos-Sanchez, Marisol B. Correia, Jose Ramon Saura
Abstract: The purpose of this study is to improve understanding of the apps (mobile applications) market in Spain and Portugal, which are countries that have many more Smartphone's per inhabitant than any other European country. The unified theory of acceptance and use of technology 2 (UTAUT2), was used to investigate the influence of various factors on the users' Behavioural intention of use for mobile applications. Confidence in the internet operator was used as an external variable for the UTAUT2 model. A surveying methodology was used for the investigation, with a sample of 402 users, which were then analysed using the partial least squares structural equation modelling (PLS-SEM) model. The constructs of UTAUT2, with the exception of price value and facilitating conditions, were all significantly related to the behavioural intention to use mobile applications. Habits and social influence are found to be the factors that most affect behavioural intention. The results obtained allow a better understanding of the users' needs when considering their intention to download and use apps.
Keywords: app; mobile application; acceptance model; trust; social influence; hedonic motivation; effort expectancy; habit; UTAUT2; m-commerce; Spain; Portugal.
Social attachment, life satisfaction and SNS continuance: a dual-role perspective
by Nan Wang, Yongqiang Sun, Liuhan Zhan, Xiao-Liang Shen
Abstract: As the sustainability of social networking sites (SNS for short) heavily relies on the content generated by users, it is important to understand the factors driving users' continuous participation. Considering that SNS has permeated almost every facet of people's lives, this study proposes to understand SNS continuance from the life-oriented perspective beyond the technology-oriented perspective. Further, due to the social nature of SNS, we propose to understand the antecedents of life satisfaction by considering the dual role of social attachment. It is posited to directly enhance individuals' life satisfaction and negatively influence life satisfaction through the mediating effect of envy. An online survey among WeChat Moments users in China was conducted to validate the proposed research model and hypotheses. The data analysis results based on partial least squares approach confirm all the hypotheses.
Keywords: social networking sites; SNS; life satisfaction; social attachment; envy; continuance intention.
Performance of an adaptive compander in wireless mobile communication systems
by A.O. Beena, Sakuntala S. Pillai
Abstract: The most popular technique used for high data rate services in 4G scenario is MIMO-OFDM. Space-time block codes have been recommended for high diversity gain in MIMO communication systems. Due to comparatively simpler design and less decoding complexity orthogonal STBCs are very attractive. In this paper, we propose a novel adaptive companding method for peak to average power ratio reduction in IEEE 802.16 standards used in 4G wireless mobile communications with orthogonal space time block coded MIMO-OFDM systems. This is obtained by fixing compander parameters independently for statistically unrelated symbols in OFDM waveform and according to the features of input symbols. The bit error rate performance analysis of the proposed system under Rayleigh fading MIMO channel conditions has also been presented. Simulation results showed that the proposed method performs better for a given PAPR preset value and a slight improvement in the BER performance was observed over fixed compander.
Keywords: multiple-input multiple-output; orthogonal frequency division multiplexing; orthogonal space time block codes; OSTBC; peak to average power ratio; PAPR; adaptive companding; QAM; BER.