Existing recommender systems usually model items as static--unchanging in attributes,
description, and features. However, in domains such as mobile apps, a version update may …

There is a semantic gap between the implications of the keywords in the recovered
documents and the implications of the terms utilized as a part of users' queries. Ranking …

With the rise of social networking services such as Facebook1 and Twitter2, people
broadcast and message friends, colleagues, and the general public about many different …