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This paper deals with a problem of production planning of manufacturing system under withdrawal and leasing constraints. We have developed a production policy for a manufacturing system composed by several identical machines mounted in parallel. The problem consists on a production system, unable to satisfy a random demand over a finite time horizon under given service level and take into account...
Despite a rising concern over this emerging global issue, theoretical understanding of the excessive use of massively multiplayer online games (MMOGs) is lacking in the mainstream IS literature. In this study, we proposed a research model to theoretically explain the development of the excessive use of MMOGs with the positive-negative reinforcement perspective. We tested our research model with 513...
ATM Security has always been one of the most prominent issues concerning the daily users and the not so frequent ones as well. This paper emphasizes on the hypothetical, yet very possible scenario of an individual's ATM card falling into the wrong hands, and the PIN number being cracked by a theft perpetrating entity. Our proposed model uses certain factors which would be monitored right from the...
Collective production communities, like open source projects, are based on volunteers collaboration and require newcomers for their continuity. Newcomers face difficulties and obstacles when starting their contributions, resulting in a large withdrawal and consequent low retention rate. This paper presents an analysis of newcomers withdrawal, checking if the dropout is influenced by lack of answer,...
This paper focuses on the prediction of university student withdrawal prior to completion of their degrees. Unlike traditional dropping-out prediction models, which use demographic attributes and historical records about dropped-out students, the model presented in this article needs only information collected from the blackboard learning management system (BLMS). The indicators used for prediction...
A large sample of college freshmen participated in the present online survey and completed two questionnaires, the Internet Addiction Test (IAT) and the University Personality Inventory (UPI). The results showed that among those 3342 students who accomplished both scales, about 25% were rated as problematic internet users and about 7.5% were classified as having severe mental health problems. Gender...
This paper presents an efficient and practical protocol to carry out micropayments, based on the use of anonymous mobile cash, that provides anonymity and unlinkability to customers. The mobile cash used in the protocol can be of different value and denomination. It is official after a bank signs it with a specific private key. The bank stores the relation between the mobile cash's value and its corresponding...
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