Lista referatów

• 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...

• 2015-11-19, godz. 12:15, 3320

  Qiang Zhang (Instytut Informatyki, Wydział MIM UW)

  Truthful Cake Cutting Mechanisms with Externalities

  Cake cutting is a fundamental problem that studies fair resource division among agents. In this talk, I will review some classical cake cutting algorithms and discuss research directions in cake cutting problems. In particular, we will see truthful cake cutting mechanisms when agents not only value ...

• 2015-11-05, godz. 12:15, 3320

  Tomasz Michalak (Instytut Informatyki, Wydział MIM UW)

  Game-Theoretic Centrality Measures

  In this talk, we discuss the computational properties of game-theoretic centrality measures. The key idea behind game-theoretic approach to network analysis is to treat nodes as players in a cooperative game, where the value of each coalition of nodes is determined by certain graph properties. Next,...

• 2015-10-29, godz. 12:15, 3320

  Jakub Pawlewicz (Instytut Informatyki, Wydział MIM UW)

  Game of Hex - Solving 10x10 board

  Hex is a famous board game with very simple rules invented by Piet Hein in 1942 and independently by John Nash in 1948. Since finding a winning strategy is PSPACE-complete it is unlikely that we will find it. However, for this game many theories were developed. On the last decade, research made by U...

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