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朴來正 弘益大學校 1988 弘大論叢 Vol.20 No.2
Polycyclic aromatic hydrocarbons(PAH)/polycyclic aromatic sulfur heterocycles (PASH) and nitrogen containing polycyclic aromatic compounds(NPAC) were investigated in air-borne particulates of Seoul metropolitan area. The samples were fractionated by alumina column chromatography and cleaned by gel filtration using Biobead. These fractions were chromatographed in a fused silica capillary column coated with SE-54(25m×0.03mmi.d.). Nineteen compounds of PAH/PASH and 8 compounds of NPAC were identified according to retention index system, and 10 compounds were further confirmed by GC/MS data. The concentrations were relatively lower compared with previously reported data. It was considered due to photodegradation during long period of sample collection by means of deposit gauge.
박래정,이현,박철훈,Park, Lae-Jeong,Lee, Hyun,Park, Cheol-Hoon 대한전자공학회 1997 電子工學會論文誌, C Vol.c34 No.5
This paper presents a parallel combinatorial variant of evolution strategy (PCES) to solve well-known combinatorial optimization problems, Quadratic assignment problems (QAPs). The PCES reduces the possibility of getting stuck in local minima due to maintenance of subpopulation and thus it is more effective than the CES. Experiment results on two benchmark problems show that the PCES is better than the cES and the genetic algorithm(GA).
朴來正 弘益大學校 1984 弘大論叢 Vol.16 No.2
Volatile ginseng flavor Components were obtained from the manufacturing process of ginseng extract. Flavor components were separated by fused silica capillary column coated with SE-52. Individual components were identified by means of GC/MS system. Twenty six compounds were identified as esters, ethers, monoterpenes, and sesquiterpenoids. Some of them were β-pinene, isobutyl propionate, 2-isopropyl-5-methyl anisole, β-maaliene, α-guaiene, and β-elemene.
유전자 집단의 크기 조절을 통한 Genetic Algorithm의 조기 포화 방지
박래정,박철훈 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.12
GAs, effective stochastic search algorithms based on the model of natural evolution and genetics, have been successfully applied to various optimization problems. When population size is not large, GAs often suffer from the phenomenon of premature convergence in which all chromosomes in the population lose the diversity of genes before they find the optimal solution. In this paper, we propose that a new heuristic that maintains the diversity of genes by adding some chromosomes with random mutation and selective mutation into population during evolution. And population size changes dynamically with supplement of new chromosomes. Experimental results for several test functions show that when population size is rather small and the length of chromosome is not long, this method is effective.
Capillary Gas Chromatography/Mass Spectrometry에 의한 리그닌 타아르의 成分硏究
朴來正 弘益大學校 1983 弘大論叢 Vol.15 No.2
A lignin tar was obtained by flash pyrolysis of Kraft pine lignin at 600℃ in nitrogen atmosphere. The tar was fractionated into four fractions, nonpolar neutral, polar neutral, bases, and acids fractions according to standard solvent partitioning scheme. Each fraction was chromatographed using fused-silica capillary column coated with SE-54 and crosslinked. Individual compound was identified according to retention indices and mass spectra obtained in GC/MS system. Twenty seven polycyclic aromatic compounds were positively identified in nonpolar neutral fraction, and 17 compounds, mostly exygenated hydrocarbons in polar neutral fraction, 12 compounds, mostly quinoline derivatives in base fraction, and 14 compounds, mostly phenolics in acid fraction.