4 resultados para Parallel programming (computer science)
em Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest
Resumo:
This paper introduces the theory of algorithm visualization and its education-related results obtained so far, then an algorithm visualization tool is going to be presented as an example, which we will finally evaluate. This article illustrates furthermore how algorithm visualization tools can be used by teachers and students during the teaching and learning process of programming, and equally evaluates teaching and learning methods. Two tools will be introduced: Jeliot and TRAKLA2.
Resumo:
Ebben a tanulmnyban a szerz egy j harmniakeres metaheurisztikt mutat be, amely a minimlis idtartam erforrs-korltos temezsek halmazn a projekt nett jelenrtkt maximalizlja. Az optimlis temezs elmletileg kt egsz rtk (nulla-egy tpus) programozsi feladat megoldst jelenti, ahol az els lpsben meghatrozzuk a minimlis idtartam erforrs-korltos temezsek idtartamt, majd a msodik lpsben az optimlis idtartamot felttelknt kezelve megoldjuk a nett jelenrtk maximalizlsi problmt minimlis idtartam erforrs-korltos temezsek halmazn. A problma NP-hard jellege miatt az egzakt megolds elfogadhat id alatt csak kismret projektek esetben kpzelhet el. A bemutatand metaheurisztika a Csbfalvi (2007) ltal a minimlis idtartam erforrs-korltos temezsek idtartamnak meghatrozsra s a tevkenysgek ennek megfelel temezsre kifejlesztett harmniakeres metaheurisztika tovbbfejlesztse, amely az erforrs-felhasznlsi konfliktusokat elsbbsgi kapcsolatok beptsvel oldja fel. Az ajnlott metaheurisztika hatkonysgnak s letkpessgnek szemlltetsre szmtsi eredmnyeket adunk a jl ismert s npszer PSPLIB tesztknyvtr J30 rszhalmazn futtatva. Az egzakt megolds generlshoz egy korszer MILP-szoftvert (CPLEX) alkalmaztunk. _______________ This paper presents a harmony search metaheuristic for the resource-constrained project scheduling problem with discounted cash flows. In the proposed approach, a resource-constrained project is characterized by its best schedule, where best means a makespan minimal resource constrained schedule for which the net present value (NPV) measure is maximal. Theoretically the optimal schedule searching process is formulated as a twophase mixed integer linear programming (MILP) problem, which can be solved for small-scale projects in reasonable time. The applied metaheuristic is based on the "conflict repairing" version of the "Sounds of Silence" harmony search metaheuristic developed by Csbfalvi (2007) for the resource-constrained project scheduling problem (RCPSP). In order to illustrate the essence and viability of the proposed harmony search metaheuristic, we present computational results for a J30 subset from the well-known and popular PSPLIB. To generate the exact solutions a state-of-the-art MILP solver (CPLEX) was used.
Resumo:
A szerzk cikkkben a szmtstechnikai hulladkokkal foglalkoznak, szmtstechnikai eszkzk alatt a szmtgp konfigurcik sszetevit rtik, teht szmtgpeket (asztali, hordozhat, terminl stb.), s perifriit (monitor, nyomtat, cd-r stb.), valamint ezek alkatrszeit s kiegsztit (chipek, mechanikus rszek, festkkazettk stb.). A rendszeres hasznlat krnyezeti hatsait csak abbl a szempontbl vizsgltk, hogy ennek sorn bizonyos alkatrszek, kellkek (kiemelten a nyomtatk festkkazetti) a gpnl nagyobb gyakorisggal cserldnek, s vlhatnak hulladkk. A f fkusz a szmtstechnikai eszkzk lettartamnak vge, s ebbl a szempontbl kulcsfogalom a hasznlt szemlyi szmtgp kategria. _____ In their article, the authors discuss the issue of computer waste; under the category of information technology devices they understand the components of computer configurations, that is computers (desktop, portable, terminal etc.) and their peripheries (monitor, printer, CD writer, etc), and also the components and supplements of these (chips, mechanical parts, toner cartridges, etc.). The environmental impact of regular use was examined only from one aspect: during regular use certain components and accessories (especially the toner cartridges of printers) are more often changed and become waste. The main focus is the end of the life time of computer devices, and from this point of view used personal computers are a key concept.
