Identification based recommender systems make no distinction between users and accounts; all the data collected during account sessions are attributed to a single user. In reality this is not necessarily true for all accounts; several different users who have distinct, and possibly very different, preferences may access the same account. Such accounts are identified as multi-user accounts. Strangely, no serious study considering the existence of multi-user accounts in recommender systems has been undertaken. This report quantifies the affect multi-user accounts have on the predictive capabilities of recommender system, focusing on two popular collaborative filtering algorithms, the kNN user-based and item-based models. The results indicate that while the item-based model is largely resistant to multi-user account corruption the quality of predictions generated by the user-based model is significantly degraded. / text

<p>Optimized quality of IT services are those which need pre-analysis of users’ requirements, service provider’s capabilities as well as service specification and standardization. For any organization, maintaining of quality of IT service has become one of the key challenges which holds a significance importance to users’ satisfaction. Thus, this research tries to explore and identify the key factors of service quality dimensions and its affect on Information Technology Service so that organization can understand and follow the possible way to maintain quality of IT service to satisfy its end users. To achieve ultimate target of this research, the relevant three literatures have been reviewed and then the concept structure has been proposed for the analysis. From the respective three literatures, service quality dimensions have been selected to be tested for quality practices in Information Technology Service Department in the United Nations Office on Drugs and Crimes (UNODC).A qualitative research approach has been used to get a better understanding of the issue. The empirical data has been gathered through the study of internal documents, five days of participant observations and in-depth structured interviews with three quality assurance staffs and one IT service user from UNODC. Data presentation and analysis have been done in accordance with the literatures framework and research questions. Finally, conclusion has been drawn by answering research questions based on the issues identified. The findings of the exploratory case study suggest that considering of dependability, prior requirement analysis, and functionality of IT product and services could be taken up to bring realistic, clear, and goal-oriented quality approach in the Information Technology Service which address users’ expectations. The quality dimensions and the gap identified in the research study provide an avenue to address the quality related difficulties that IT service organizations encounter while developing of IT services. This study is expected to create a significant contribution to the areas within a domain of service quality in Information Technology as well as in Information System and Information Management. <strong></strong></p><p> </p>

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The purpose of this research was to provide evidence to support specific features of a software user interface implementation. A 3 x 2 x 2 full factorial, between subjects design was employed, in a laboratory experiment systematically varying existence or non-existence of a user interface and media of help documentation (either online or written), while blocking for varying levels of user experience. Subjects completed a set of tasks using a computer, so the experimenters could collect and evaluate various performance and attitudinal measures. Several attitudinal measures were developed and validated as part of this research. Consistent with previous findings, this research found that a user's previous level of experience in using a computer had a significant impact on their performance measures. Specifically, increased levels of user experience were associated with reduced time to complete the tasks, fewer number of characters typed, fewer references to help documentation, and fewer requests for human assistance. In addition, increased levels of user experience were generally associated with higher levels of attitudinal measures (general attitude toward computers and satisfaction with their experiment performance). The existence of a user interface had a positive impact on task performance across all levels of user experience. Although experienced users were not more satisfied with the user interface than without it, their performance was better. This contrasts with at least some previous findings that suggest experienced users are more efficient without a menu-driven user interface. The use of online documentation, as opposed to written, had a significant negative impact on task performance. Specifically, users required more time, made more references to the help documentation, and required more human assistance. However, these users generally indicated attitudinal measures (satisfied) that were as high with online as written documentation. There was a strong interaction between the user interface and online documentation for the task performance measures. This research concludes that a set of tasks can be performed in significantly less time when online documentation is facilitated by the presence of a user interface. Written documentation users seemed to perform equivalently with or without the user interface. With online documentation the user interface became crucial to task performance. Research implications are presented for practitioners, designers and researchers.

User education is one of the essential activities of the library to optimize the use of library services. This paper discusses the use of multimedia based videos for the promotion of library services and activities with the help of emerging trends and technologies and the power of Web 2.0 especially YouTube. Through this paper, it is tried to demonstrate the procedural aspects of promoting user education through developing multimedia based user education program and utilizing the services of YouTube as media of marketing and communication at Jaypee University of Information Technology, Solan, Himachal Pradesh, India.

Current research in screen design for human computer interaction has demonstrated that user task performance is influenced by placement, prompting methodology, and screen complexity. To assess the difference between a grouped item screen prompt and a series of single item screen prompts, a field experiment in a semiconductor manufacturing facility was designed. Subjects were randomly assigned to one of two groups to use a data entry system. Seven of the screen prompts differed between the two groups. During the four weeks of the study, a significant difference was measured between groups. The group screen users had lower task times for all four weeks. No significant correlation exists between work experience, performance review scores, or designated work shift. A strong negative correlation exists between frequency of system usage and task time. No difference was noted for measured errors. Subjective scores significantly favored the group screen design.

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