Národní úložiště šedé literatury Nalezeno 8 záznamů.  Hledání trvalo 0.00 vteřin. 
Multiprocessor Randomized On-line Scheduling
Tichý, Tomáš
This paper studies randomized on-line non-preemptive scheduling in multiprocessor systems. In this problem each task is specified by its processing time andscheduled on any of $m$ identical processors. The objective is to minimize theexpected mekespan. We prove lemmas and theorems describing $sigma_m$-competitive randomized algorithms on $m$ processors. The main result is an........
Online competitive algorithms for maximizing weighzed throughput of unit jobs. ITI Series 2003-172
Bartal, Y. ; Chin, F. Y. L. ; Chrobak, M. ; Fung, S. P. Y. ; Jawor, W. ; Lavi, R. ; Sgall, Jiří ; Tichý, Tomáš
We study an online buffer management problem for networks supporting Quality-of-Service (QoS) applications, equivalently as an online scheduling problem forunit-length jobs, where each job is specified by its release time, deadline, and a nonnegative weight (QoS value). The goal is to maximize the emph{weighted throughput}, that is the total weight of scheduled jobs.
Optimal and online preemptive scheduling on uniformly related machines. ITI Series 2003-171
Ebenlendr, T. ; Sgall, Jiří
We consider the problem of preemptive scheduling on uniformly related machines.We present a semi-online algorithm which, if the optimal makespan is given in advance, produces an optimal schedule. Using the standard doubling technique, this yields a 4 competitive deterministic and 2.71 competitive randomized online algorithms. In addition, it matches the performance of the previously......
Coloring graphs from lists with bounded size of their union. KAM-DIMATIA. Series 2003-641 and ITI Series 2003-156
Král, D. ; Sgall, Jiří
We construct a graph G which is k-choosable from any lists of colors whoseunion has size at most u but the same does not hold with lists whose union has size u+1.
It is tough to be a plumber
Král, D. ; Majerech, V. ; Sgall, Jiří ; Tichý, Tomáš ; Woeginger, G.
In the Linux computer game {tt KPlumber/}, the objective is to rotate tiles in a ~ raster of squares so as to complete a~ system of pipes. We give a~complexity classification for the original game and various special cases of it that arise from restting the set of six possible tiles.
Analysis of the Harmonic algorithm for three servers
Chrobak, M. ; Sgall, Jiří
Harmonic is a randomized $ k $-server algorithm that, at each step, given a request point $ r $, chooses the server to be moved to $ r $ with probability inversely proportional to the distance to $ r $. In this paper we prove that harmonic is $ 6 $-cotitive for $ k = 3 $.
Dolní odhad pro omezené pravděpodobnostní online algoritmy pro rozvrhování
Tichý, Tomáš
Článek dokazuje dolní odhad pro omezené prqvděpodobnostní online algoritmy pro rozvrhování.

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