| Vol-816 urn:nbn:de:0074-816-1 Copyright © 2011 for the individual papers by the papers' authors. Copying permitted only for private and academic purposes. This volume is published and copyrighted by its editors.

# DiveRS 2011 – ACM RecSys 2011 Workshop on Novelty and Diversity in Recommender Systems

### Proceedings of the Workshop on Novelty and Diversity in Recommender Systems (DiveRS 2011), at the 5th ACM International Conference on Recommender Systems (RecSys 2011)

### Chicago, Illinois, USA, 23 October 2011

Edited by

### Pablo Castells1
Jun Wang2
Rubén Lara3
Dell Zhang4

1 Universidad Autónoma de Madrid, Spain
2 University College London, UK
3 Telefónica Investigación y Desarrollo, Spain
4 Birkbeck, University of London, UK

## Table of Contents

Front matter: preface and table of contents

### Keynote

- Towards Diverse Recommendation 1
  Neil Hurley

### Papers

1. Maximizing Aggregate Recommendation Diversity: A Graph-Theoretic Approach 3-10
   Gediminas Adomavicius, Youngok Kwon
2. On Unexpectedness in Recommender Systems: Or How to Expect the Unexpected 11-18
   Panagiotis Adamopoulos, Alexander Tuzhilin
3. Fusion-based Recommender System for Improving Serendipity 19-26
   Kenta Oku, Fumio Hattori
4. The Oblivion Problem: Exploiting Forgotten Items to Improve Recommendation Diversity 27-34
   Fernando Mourão, Claudiane Fonseca, Camila Araújo, Wagner Meira Jr.
5. A Framework for Recommending Collections 35-42
   Jennifer Golbeck, Derek L. Hansen
6. Helping Users Perceive Recommendation Diversity 43-50
   Rong Hu, Pearl Pu
7. An Evaluation of Novelty and Diversity Based on Fuzzy Logic 51-58
   Simone Santini, Pablo Castells

The whole proceedings can also be downloaded as a single file (pdf).

2-Dec-2011: submitted by Pablo Castells
2-Dec-2011: published on CEUR-WS.org