4 research outputs found
Algoritmi za odreÄivanje najbližeg para
U ovom radu smo prouÄili Å”est algoritama za rjeÅ”avanje problema najbližeg para u . Pokazali smo kako se problem može rijeÅ”iti deterministiÄkim algoritmom složenosti , a nedeterministiÄkim algoritmima složenost možemo spustiti do . Ipak, testiranjem smo utvrdili da je na praktiÄnim veliÄinama ulaznih podataka od egzaktnih algoritama najefikasniji onaj koji je predstavljen u odjeljku 3.1 pod imenom Divide_and_Conquer, Äija složenost je . Na kraju smo predstavili i jedan parametrizirani heuristiÄki algoritam složenosti koji pronalazi približno rjeÅ”enje, Äija toÄnost se može poveÄati nauÅ”trb vremena izvoÄenja.In this paper we have examined six different algorithms for solving the closest pair of points problem in . We have shown that the problem can be solved with deterministic algorithms in time and in time with non-deterministic algorithms. However, testing these algorithms has revealed that, for practical input sizes, the most efficient exact algorithm is the one we have labelled Divide_and_Conquer which was presented in section 3.1 and which runs in time. In the final chapter we have presented a parameterised simulated annealing algorithm which finds an approximate solution in time, accuracy of which can be increased at the expense of speed
Algoritmi za odreÄivanje najbližeg para
U ovom radu smo prouÄili Å”est algoritama za rjeÅ”avanje problema najbližeg para u . Pokazali smo kako se problem može rijeÅ”iti deterministiÄkim algoritmom složenosti , a nedeterministiÄkim algoritmima složenost možemo spustiti do . Ipak, testiranjem smo utvrdili da je na praktiÄnim veliÄinama ulaznih podataka od egzaktnih algoritama najefikasniji onaj koji je predstavljen u odjeljku 3.1 pod imenom Divide_and_Conquer, Äija složenost je . Na kraju smo predstavili i jedan parametrizirani heuristiÄki algoritam složenosti koji pronalazi približno rjeÅ”enje, Äija toÄnost se može poveÄati nauÅ”trb vremena izvoÄenja.In this paper we have examined six different algorithms for solving the closest pair of points problem in . We have shown that the problem can be solved with deterministic algorithms in time and in time with non-deterministic algorithms. However, testing these algorithms has revealed that, for practical input sizes, the most efficient exact algorithm is the one we have labelled Divide_and_Conquer which was presented in section 3.1 and which runs in time. In the final chapter we have presented a parameterised simulated annealing algorithm which finds an approximate solution in time, accuracy of which can be increased at the expense of speed
Algoritmi za odreÄivanje najbližeg para
U ovom radu smo prouÄili Å”est algoritama za rjeÅ”avanje problema najbližeg para u . Pokazali smo kako se problem može rijeÅ”iti deterministiÄkim algoritmom složenosti , a nedeterministiÄkim algoritmima složenost možemo spustiti do . Ipak, testiranjem smo utvrdili da je na praktiÄnim veliÄinama ulaznih podataka od egzaktnih algoritama najefikasniji onaj koji je predstavljen u odjeljku 3.1 pod imenom Divide_and_Conquer, Äija složenost je . Na kraju smo predstavili i jedan parametrizirani heuristiÄki algoritam složenosti koji pronalazi približno rjeÅ”enje, Äija toÄnost se može poveÄati nauÅ”trb vremena izvoÄenja.In this paper we have examined six different algorithms for solving the closest pair of points problem in . We have shown that the problem can be solved with deterministic algorithms in time and in time with non-deterministic algorithms. However, testing these algorithms has revealed that, for practical input sizes, the most efficient exact algorithm is the one we have labelled Divide_and_Conquer which was presented in section 3.1 and which runs in time. In the final chapter we have presented a parameterised simulated annealing algorithm which finds an approximate solution in time, accuracy of which can be increased at the expense of speed
Å tetni agensi pri proizvodnji anoda
The aim of this study was to assess to which extent the modernisation of an anode plant had reduced occupational chemical health hazards for jobs with the highest potential of exposure. Periodical measurements of dust and gases were performed at the same workplaces using the same methods, before and after modernisation. These measurements were compared with the recommended standards. Before modernisation the concentrations of total dust, carbon monoxide, carbon dioxide, sulphur dioxide, hydrogen fluoride, benzene, and phenol were above the recommended standards in 56.9 % (74/130) of the samples. After modernisation, only 12.3 % (21/171) of the samples were non-conforming. Before modernisation, workers were exposed to higher concentrations of all agents in all production sections. After modernisation, dust remained the primary pollutant in harmful concentrations in the anode baking furnace (GM=22.1 mg m-3) and in the anode rodding room (GM=22.1 mg m-3), hydrogen fluoride in the anode rodding room (GM=4.2 mg m-3), and sulphur dioxide in all production sections. As plant modernisation has not completely resolved the exposure issue, stringent compliance to safety rules and regular medical checkups are necessary.Cilj je rada procijeniti uÄinak modernizacije tehnoloÅ”kog procesa u Tvornici anoda na prisutnost i razinu koncentracije praÅ”ine i plinova Å”tetnih za zdravlje radnika u radnom okoliÅ”u, kao i na poslove s velikim potencijalom za izloženost zaposlenih. U tu svrhu usporeÄivani su rezultati obveznih periodiÄkih mjerenja kemijskih Äimbenika provedeni prije i nakon modernizacije. Mjerenja su provedena na istim radnim mjestima i istim metodama tijekom radnih smjena i usporeÄeni sa sadaÅ”njim nacionalnim Standardom. Prije modernizacije, koncentracije ukupne praÅ”ine i plinova: ugljikova(II) oksida, ugljikova(IV) oksida, sumporova(IV) oksida, fluorovodika, benzena i fenola prelazile su preporuÄene vrijednosti u 56,9 % uzoraka, a nakon modernizacije u 12,3 % (21/171) uzoraka. Prije modernizacije radnici su istodobno na velikom broju radnih mjesta svih odjela bili izloženi prekomjernim koncentracijama Å”tetnih kemijskih Äimbenika. Nakon modernizacije praÅ”ina je i dalje prisutna u visokim koncentracijama pri peÄenju anoda (GM=22,1 mg m-3), kao i pri zalijevanju anoda (GM=22,1 mg m-3), a geometrijska sredina koncentracije fluorovodika pri zalijevanju anoda iznosi 4,2 mg m-3, dok je sumporov(IV) oksid prisutan u svim fazama proizvodnje anoda u koncentracijama Å”tetnim za zdravlje radnika. Modernizacijom tehnoloÅ”kog procesa smanjene su prisutnost i koncentracije kemijskih Äimbenika u radnom okoliÅ”u. MeÄutim, izloženost praÅ”ini, sumporovu(IV) oksidu i fluorovodiku samo je djelomiÄno smanjena