With the rapid development of online reputation systems, manipulations against such systems are evolving quickly. In this paper, we propose a Dempster-Shafer theory based trust scheme to protect reputation systems. When tested against real user attack data collected from a cyber competition, the proposed scheme has achieved a very good performance in terms of accurately identifying malicious us...

Are quoted sources in online news as psychologically meaningful us those in printed and broadcast news ? A within-suhjects experiment was designed to answer this question. On a web site,forty-eight subjects read three online news stories with cjuotes and three stories without source attribution. They rated stories with quotes significantly higher in credibility and quality than identical storie...

The singular value decomposition (SVD) is fundamental to many data modeling/mining algorithms, but SVD algorithms typically have quadratic complexity and require random access to complete data sets. This is problematic in most data mining settings. We detail a family of sequential update rules for adding data to a “thin” SVD data model, revising or removing data already incorporated into the mo...

background : during the past two decades, a great deal of research has been conducted on developing affective norms for words in various languages, showing that there is an urgent need to create such norms in persian language, too. the present study intended to develop a set of 362 persian words rated according to their emotional valence, arousal, imageability, and familiarity so as to prepare ...

Rating systems not only provide information to users but also motivate the rated agent. This paper solves for the optimal (effort-maximizing) rating system within the standard career concerns framework. It is a mixture two-state rating system. That is, it is the sum of two Markov processes, with one that reflects the belief of the rater and the other the preferences of the rated agent. The rati...

By deploying big data analytical techniques to retrieve and analyze a large volume of more than 2.7 million reviews, this work sheds light on how environmental concerns expressed by tourists digital platforms, in the guise online influence their satisfaction with tourism hospitality services. More specifically, we conduct multi-platform study Tripadvisor.com Booking.com reviews (ORs) pertaining...

PURPOSE To characterize patient evaluations of American Society of Ophthalmic Plastic and Reconstructive Surgery (ASOPRS) surgeons on a popular online physician rating website in an effort to determine which factors play a role in determining the likelihood of a patient recommending an ASOPRS surgeon to family and friends. METHODS After obtaining approval and access from Healthgrades.com, the...

In e-commerce based online marketplaces, information asymmetry is a big problem. On one hand, the buyers need to learn more than just the price to make decisions whether to buy from a particular seller; on the other hand, the sellers need to distinguish themselves from sellers selling goods of worse quality. Without a well established mechanism to prevent this kind of moral hazard problem, the ...

Recent interest in online course design has prompted concern in issues relating to assessment of student contributions in computer-mediated communication (CMC) environments. A current focus of discussion in CMC research is to look into how instructors could move away from looking at the quantity (i.e., the number of postings) to assessing the quality (i.e., the usefulness and meaningfulness of ...