105 citations · 270 across the 20 of their papers we have counts for
10 papers · 1 filter
Recommendation Fairness in Social Networks Over Time
Meng Cao, Hussain Hussain, Sandipan Sikdar +3
In social recommender systems, it is crucial that the recommendation models provide equitable visibility for different demographic groups, such as gender or race. Most existing res…
Synwalk -- Community Detection via Random Walk Modelling
Christian Toth, Denis Helic, Bernhard C. Geiger
Complex systems, abstractly represented as networks, are ubiquitous in everyday life. Analyzing and understanding these systems requires, among others, tools for community detectio…
Empirical Comparison of Graph Embeddings for Trust-Based Collaborative Filtering
Tomislav Duricic, Hussain Hussain, Emanuel Lacic +3
In this work, we study the utility of graph embeddings to generate latent user representations for trust-based collaborative filtering. In a cold-start setting, on three publicly a…
Activity Archetypes in Question-and-Answer (Q&A) Websites - A Study of 50 Stack Exchange Instances
Tiago Santos, Simon Walk, Roman Kern +2
Millions of users on the Internet discuss a variety of topics on Question-and-Answer (Q&A) instances. However, not all instances and topics receive the same amount of attention, as…
How Users Explore Ontologies on the Web: A Study of NCBO's BioPortal Usage Logs
Simon Walk, Lisette Espín-Noboa, Denis Helic +2
Ontologies in the biomedical domain are numerous, highly specialized and very expensive to develop. Thus, a crucial prerequisite for ontology adoption and reuse is effective suppor…
Assessing the Navigational Effects of Click Biases and Link Insertion on the Web
Florian Geigl, Kristina Lerman, Simon Walk +2
Websites have an inherent interest in steering user navigation in order to, for example, increase sales of specific products or categories, or to guide users towards specific infor…
Random Surfers on a Web Encyclopedia
Florian Geigl, Daniel Lamprecht, Rainer Hofmann-Wellenhof +3
The random surfer model is a frequently used model for simulating user navigation behavior on the Web. Various algorithms, such as PageRank, are based on the assumption that the mo…
Activity Dynamics in Collaboration Networks
Simon Walk, Denis Helic, Florian Geigl +1
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…
HypTrails: A Bayesian Approach for Comparing Hypotheses About Human Trails on the Web
Philipp Singer, Denis Helic, Andreas Hotho +1
When users interact with the Web today, they leave sequential digital trails on a massive scale. Examples of such human trails include Web navigation, sequences of online restauran…
Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order
Philipp Singer, Denis Helic, Behnam Taraghi +1
One of the most frequently used models for understanding human navigation on the Web is the Markov chain model, where Web pages are represented as states and hyperlinks as probabil…