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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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Seminarium „Gry, mechanizmy i sieci społeczne”

Cotygodniowe seminarium badawcze (brak strony WWW)


Lista referatów

  • 2018-03-29, godz. 10:15, 4050

    Krzysztof Rządca (Instytut Informatyki, UW)

    Collective Schedules: Scheduling Meets Computational Social Choice

    When scheduling public works or events in a shared facility one needs to accommodate preferences of a population. We formalize this problem by introducing the notion of a collective schedule. We show how to extend fundamental tools from social choice theory---positional scoring rules, the Kemeny ru...

  • 2018-03-15, godz. 10:15, 4790

    Jadwiga Sosnowska (Instytut Informatyki UW)

    Path Evaluation and Centralities in Weighted Graphs – An Axiomatic Approach

    We study the problem of extending the classic centrality measures to weighted graphs. Unfortunately, in the existing extensions, paths in the graph are evaluated solely based on their weights, which is a restrictive and undesirable assumption for a variety of settings. Given this, we define a notion...

  • 2018-01-25, godz. 10:15, 4790

    Rahul CS (Instytut Informatyki, UW)

    Group Activity Selection parameterized by the Number of Agent Types

    We study the parameterized complexity of GASP (Group Activity Selection Problem) and its variant gGASP w.r.t. the number of different agent types as a parameter. We show that GASP can be solved in polynomial time if the number of agent types is a constant and complement this result with a strong par...

  • 2018-01-11, godz. 10:15, 4790

    Oskar Skibski (Instytut Informatyki, UW)

    A Pseudo-Polynomial Algorithm for Computing Power Indices in Graph-Restricted Weighted Voting Games

    Weighted voting games allow for studying the distribution of power between agents in situations of collective decision making. While the conventional version of these games assumes that any agent is always ready to cooperate with all others, recently, more involved models have been proposed, where c...

  • 2017-12-21, godz. 10:15, 4790

    Marcin Waniek (Khalifa University of Science and Technology)

    Strategic Network Diffusion

    Spreading of ideas in a social network is usually modelled in the literature as a stochastic process. However, in many real-life applications the exact course of the diffusion can be guided by a certain individual or authority. Given this background, we analyse a setting in which the process of spre...

  • 2017-12-07, godz. 10:15, 4790

    Jan Woźnica (Instytut Informatyki, UW)

    Strategic Evasion of Centrality Measures

    Among the most fundamental tools for social network analysis are centrality measures, which are designed to rank nodes according to various criteria. Similarly to other tools, they were built around the assumption that individuals in the network do not act strategically to evade analysis. Even the c...

  • 2017-11-30, godz. 10:15, 4790

    Marcin Dziubiński (Instytut Informatyki, UW)

    Hide and seek game with heterogenous hiding places

    We study a conflict with multiple battlefields where two players, the hider and the seeker, choose their respective numbers of hiding places. The hiding places have different values and the score of the hider is the sum of values of the places chosen by him and not chosen by the seeker. The score of...

  • 2017-11-09, godz. 10:15, 4790

    Tomasz Wąs (Instytut Informatyki, Uniwersytet Warszawski)

    An Axiomatization of the Eigenvector and Katz Centralities

    Feedback centralities are one of the key classes of centrality measures. They assess the importance of a vertex recursively, based on the importance of its neighbours. Feedback centralities includes the Eigenvector Centrality, as well as its variants, such as the Katz Centrality or the PageRank, and...

  • 2017-10-26, godz. 10:15, 4790

    Krzysztof R. Apt (Instytut Informatyki, Uniwersytet Warszawski)

    Self-Stabilization Through the Lens of Game Theory

    In 1974 E.W. Dijkstra introduced the seminal concept of self-stabilization that turned out to be one of the main approaches to fault-tolerant computing. We show here how his three solutions can be formalized and reasoned about using the concepts of game theory. We also determine the precise number o...

  • 2017-10-12, godz. 10:15, 4790

    Leonie Baumann (University of Cambridge)

    Identifying the best agent in a network

    This paper develops a mechanism for a principal to assign a prize to the most valuable agent from a set of heterogeneously valued agents in a network. The principal does not know the value of any agent. Agents are competing for the prize and they have a "knowledge network": If two agents are linked,...

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