Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Tuesday, April 22, 2008, 12:15 pm

**Duration**: This information is not available in the database

**Location**: OAT S15/S16/S17

**Speaker**: Fabian Kuhn

In today's computing environments, data is no longer stored at one central server. Often, data is distributed across many heterogeneous locations that are connected through a network. Nevertheless, there need to be efficient methods to query large data sets. In the talk, I will consider the problem of distributed k-selection where, given a connected graph of diameter D consisting of n nodes in which every node holds an element, the goal is to determine the kth smallest of these elements. I will present a simple distributed randomized algorithm with time complexity O(D*log_D(n)) and I will prove a lower bound of Omega(D*log_D(n)) implying that the presented algorithm is asymptotically optimal.

Joint work with Thomas Locher and Roger Wattenhofer.

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