Lista referatów

• 2016-10-27, godz. 10:15, 1780

  Marcin Waniek (Instytut Informatyki UW)

  On Hiding Communities and Evading Link Prediction in Social Networks

  Community detection and link prediction are two of the main research problems in social network analysis. While various private and public institutions are interested in identifying communities, it raises serious privacy issues as well as security-related concerns. We introduce the problem of hid...

• 2016-10-13, godz. 10:15, 1780

  Takamasa Suzuki (Kyushu University)

  Efficient assignment mechanism with endowments and distributional constraints

  We consider an assignment problem of multiple types goods to agents, where each type of a good has multiple copies (e.g., multiple seats of a school). Each agent is endowed with a good. Some distributional constraints are imposed on the allocation (e.g., minimum/maximum quotas, the balance of r...

• 2016-05-19, godz. 12:15, 1770

  Oskar Skibski (Wydział MIM UW)

  k-Coalitional Cooperative Games

  In most previous models of coalition structure generation, it is assumed that agents may partition themselves into any coalition structure. In practice, however, there may be physical and organizational constraints that limit the number of co-existing coalitions. In this paper, we introduce k-coalit...

• 2016-05-05, godz. 12:15, 1770

  Piotr Skowron (University of Oxford)

  Axiomatic Characterization of Committee Scoring Rules

  We provide an axiomatic characterization of committee scoring rules, analogues of the scoring rules for the multiwinner elections. We show that committee scoring rules are characterized by the set of four standard axioms, anonymity, neutrality, consistency and continuity, and by two axioms specific ...

• 2016-04-14, godz. 12:15, 1770

  Oskar Skibski (Instytut Informatyki, Wydział MIM UW)

  Attachment Centrality: An Axiomatic Approach to Connectivity in Networks

  In many social networks, certain nodes play more important roles than others. Consequently, the concept of centrality index has been extensively studied in the literature. More recently, a number of new centrality indices have been proposed in an attempt to reflect the following fundamental property...

• 2016-03-31, godz. 12:15, 1770

  Marcin Waniek (Instytut Informatyki, Wydział MIM UW)

  The Dollar Auction with Spiteful Bidders

  Shubik's (all-pay) dollar auction is a simple yet powerful auction model that aims to shed light on the motives and dynamics of conflict escalation. Common intuition suggests that the dollar auction is a trap, inducing conflict by its very design. However, O'Neill proved that, contrary to the experi...

• 2016-03-17, godz. 12:15, 1770

  Piotr Skowron (University of Oxford)

  Committee Scoring Rules: Axiomatic Classification and Hierarchy

  We present and advertise the class of committee scoring rules, recently introduced as multiwinner analogues of single-winner scoring rules. We present a hierarchy of committee scoring rules (while includes all previously studied subclasses of committee scoring rules, as well as two new subclasses), ...

• 2016-03-03, godz. 12:15, 3320

  Marcin Dziubiński (Instytut Informatyki, Wydział MIM UW)

  Network elicitation in adversarial environment

  We consider a problem of a defender who wants to protect a network against a contagious attack. The defender could only protect a fixed number of nodes and does not know the network. Each of the nodes in the network does not know the network either, but knows his/her neighbours only. We propose an i...

• 2016-01-07, godz. 12:15, 3320

  Jaideep Roy (Deakin University)

  Optimal size of majoritarian committees under persuasion

  We analyse the `optimal' size of non-deliberating majoritarian committees with no conflict of interest among its members when committees can be persuaded by a biased and informed expert. We find that when this bias is small, the optimal size is one; when it is intermediate, the optimal size increase...

• 2015-12-17, godz. 12:15, 3320

  Piotr Skowron (Google)

  Multi-Winner Elections: What do we Elect Committees for?

  We present a brief overview of several interesting multi-winner election rules and we identify a broad natural class of multi-winner score-based rules (called committee-scoring rules), and we show that several existing interesting rules can be captured by this class. Within this class we identify th...

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