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ACM Transactions on the Web (TWEB), Volume 10 Issue 2, May 2016

A Novel Evidence-Based Bayesian Similarity Measure for Recommender Systems
Guibing Guo, Jie Zhang, Neil Yorke-Smith
Article No.: 8
DOI: 10.1145/2856037

User-based collaborative filtering, a widely used nearest neighbour-based recommendation technique, predicts an item’s rating by aggregating its ratings from similar users. User similarity is traditionally calculated by cosine...

A Buyer-Friendly and Mediated Watermarking Protocol for Web Context
Franco Frattolillo
Article No.: 9
DOI: 10.1145/2856036

Watermarking protocols are used in conjunction with digital watermarking techniques to protect digital copyright on the Internet. They define the schemes of the web transactions by which buyers can purchase protected digital content distributed by...

Q2P: Discovering Query Templates via Autocompletion
Wensheng Wu, Weiyi Meng, Weifeng Su, Guangyou Zhou, Yao-Yi Chiang
Article No.: 10
DOI: 10.1145/2873061

We present Q2P, a system that discovers query templates from search engines via their query autocompletion services. Q2P is distinct from the existing works in that it does not rely on query logs of search engines that are typically not readily...

Activity Dynamics in Collaboration Networks
Simon Walk, Denis Helic, Florian Geigl, Markus Strohmaier
Article No.: 11
DOI: 10.1145/2873060

Many online collaboration networks struggle to gain user activity and become self-sustaining due to the ramp-up problem or dwindling activity within the system. Prominent examples include online encyclopedias such as (Semantic) MediaWikis,...

Probabilistic QoS Aggregations for Service Composition
Huiyuan Zheng, Jian Yang, Weiliang Zhao
Article No.: 12
DOI: 10.1145/2876513

In this article, we propose a comprehensive approach for Quality of Service (QoS) calculation in service composition. Differing from the existing work on QoS aggregations that represent QoS as single values, discrete values with frequencies, or...

Search and Breast Cancer: On Episodic Shifts of Attention over Life Histories of an Illness
Michael J. Paul, Ryen W. White, Eric Horvitz
Article No.: 13
DOI: 10.1145/2893481

We seek to understand the evolving needs of people who are faced with a life-changing medical diagnosis based on analyses of queries extracted from an anonymized search query log. Focusing on breast cancer, we manually tag a set of Web searchers...

What Users Actually Do in a Social Tagging System: A Study of User Behavior in BibSonomy
Stephan Doerfel, Daniel Zoller, Philipp Singer, Thomas Niebler, Andreas Hotho, Markus Strohmaier
Article No.: 14
DOI: 10.1145/2896821

Social tagging systems have established themselves as an important part in today’s Web and have attracted the interest of our research community in a variety of investigations. Henceforth, several aspects of social tagging systems have been...