13 citations · 19 across the 9 of their papers we have counts for
9 papers
An Evolutionary Approach to Coalition Formation
Paraskevas V. Lekeas
In Cooperative Games with Externalities when the members of a set S \subset N of agents wish to deviate they need to calculate their worth. This worth depends on what the non-membe…
A Note on Circular Arc Online Coloring using First Fit
Paraskevas V. Lekeas
In Raman (2007), using a column construction technique it is proved that every interval graph can be colored online with First Fit with at most colors, where is the…
Coalitional Beliefs of Cournot Network Agents
Paraskevas V. Lekeas
In Network cooperative games, due to computational complexity issues, agents are not able to base their behavior on the "whole network status" but have to follow certain "beliefs"…
Should I quit using my resource? Modeling Resource Usage through Game Theory
Paraskevas V. Lekeas
Existing web infrastructures have supported the publication of a tremendous amount of resources, and over the past few years Data Resource Usage is an everyday task for millions of…
Cooperative oligopoly games with boundedly rational firms
Paraskevas V. Lekeas, Giorgos Stamatopoulos
We analyze cooperative Cournot games with boundedly rational firms. Due to cogni- tive constraints, the members of a coalition cannot accurately predict the coalitional structure o…
Cooperative oligopoly games: a probabilistic approach
Paraskevas V. Lekeas, Giorgos Stamatopoulos
We analyze the core of a cooperative Cournot game. We assume that when contemplating a deviation, the members of a coalition assign positive probability over all possible coalition…
Strategic delegation in a sequential model with multiple stages
Paraskevas V. Lekeas, Giorgos Stamatopoulos
We analyze strategic delegation in a Stackelberg model with an arbitrary number, n, of firms. We show that the n-1 last movers delegate their production decisions to managers where…
A New Framework for Join Product Skew
Foto Afrati, Victor Kyritsis, Paraskevas V. Lekeas +1
Different types of data skew can result in load imbalance in the context of parallel joins under the shared nothing architecture. We study one important type of skew, join product…
Managing Semantic Loss during Query Reformulation in Peer Data Management Systems
Yannis Delveroudis, Paraskevas V. Lekeas
In this paper we deal with the notion of semantic loss in Peer Data Management Systems (PDMS) queries. We define such a notion and we give a mechanism that discovers semantic loss…