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비선형 최적화문제의 해결을 위한 개선된 유전알고리즘의 연구
우병훈,하정진 한국경영과학회 1996 經營 科學 Vol.13 No.1
Genetic Algorithms have been successfully applied to various problems (for example, engineering design problems with a mix of continuous, integer and discrete design variables) that could not have been readily solved with traditional computational techniques. But, several problems for which conventional Genetic Algorithms are ill defined are premature convergence of solution and application of exterior penalty function. Therefore, we developed an Improved Genetic Algorithms(IGAs) to solve above two problems. As a case study, IGAs is applied to several nonlinear optimization problems and it is proved that this algorithm is very useful and efficient in comparison with traditional methods and conventional Genetic Algorithm.
Tetraphenyldiazocyclopentadiene의 合成과 光反應
李愚鵬,李秉淑 경북대학교 과학교육연구소 1990 科學敎育硏究誌 Vol.14 No.-
Tetraphenyldiazocyclopentadiene is an useful compound to prepare carbene which is an activated intermediate in the photoreaction, pyrolysis and the other reactions. We have synthesized tetraphenyldiazocyclopentadiene from tetraphenylcyclopentadienone and toluene-p-sulphonylhydrazone. The yields were fairly good with 64%. tetraphenyldiazocyclopentadiene was irradiated with 400W UV Lamp(λ=365nm) in diethylether under nitrogen atmosphere. In the photoreaction we observed a carbene, prepared from tetraphenyldiazocyclopentadiene, underwent O-H insertion and C-H insertion reaction. We observed a mixture of 15 species in these reations with TLC analysis. But the major reaction was C-H insertion.
페놀誘導體 酸化防止劑의 Lipidperoxidation에 미치는 影響
李愚鵬,李貞鎬 경북대학교 과학교육연구소 1990 科學敎育硏究誌 Vol.14 No.-
The relative comparison of the effectivities of antioxidants(3, 5-Di-tert-butyl-4-hydroxybenzoic acid, its derivatives, BHT and 2, 6-Di-tert-butylphenol) gives the knowiedge of the substituent effect of phenolic antioxidants on lipidperoxidation. We used polarograpic method initiated by hemoglobin to measure te effectiveness of antioxidants. Protective Indices(P.I.) was used for the relative comparison of activities of antioxidants. P.I=Oxidation of emulsion with antioxidant(min)/Oxidation of control emulsion(min) The result result of experiment showed that BHT has the highest activity and stearyl ester has the lowest activity. From these results, we came to the conclusion that the activities of anti-oxidants depend on the substituent effect of phenolic antioxidant;inductive effect and steric effect.
李愚鵬,吳東元,朴美淑,黃悳海,司空恩,朴在均 慶北大學校 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.-
Poly (9,9-dialkylfluorene-2,7-diyl) derivatives end capped with 2,7-dibromo-9,9-dihexylfluorene and conductive fluorene substituents have been synthesized through Ni(0), the nickel-catalysed reduction with metallic zinc-mediated polymerization. When electron and hole recombined and formed a exciton in emitting layer. Singlet exciton and triplet exciton is the ratio of one to three. One is fluorescence and three is phosphorescence, but phosphorescence is almost sustained a loss. Not only to shift blue region but to increase phosphorescence efficiency, it is substituted Eu for the terminal H in this polymer chain. P1-Eu showed green emission at 533nm while P1 had at 548nm. The main emission peaks of the P1-Eu shift shorter wavelength, besides we observed another emission peaks of the P1Eu at 418nm.
李愚鵬,吳東元,朴美淑,黃悳海,宋智怜,朴在均 慶北大學校 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.-
Poly [2,7-(9,9-di-n-hexyl-fluorene-co-9,9-dibenzylidenylflourene)-2,7diyl] was synthesized through nikel-catalyzed coupling between 9,9-disubstituted 2,7-dibromofluorene and new fluorene-based monomer, 9,9-dibenzylidenylflurene in good yield. The polymer containing new fluorene monomer, 2,7-dibromo-9,9-dibenzylidenyflu -orene, which not only has extended π conjugation, but also has sterically hinderd sudstituents at the 9-position. The polymer obtained is found to be soluble in conventional organic solvents such as chloroform and was characterized by GPC, ^(1)H NMR and ^(13)C NMR. Also the UV absorption band showed the peak of maximum absorption at 373 nm and the photoluminescence (PL) spectra emission band showed the peak at 558 nm yellowish green region.
1.3-Diiodobicyclo [1.1.1] pentane 과 Sodium sulfide 와의 반응
이우붕,오동원,신현정 慶北大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.-
[1.1.1]propellane has an inverted structure at the two bridged carbon atoms. Interbridgehead bonding character of [1.1.1]propellane was described by p-p(σ) bond. Interbridgehead bond distance is longer than normal C-C bond and it's charge distrbution is about four-fifths of a normal C-C bond So [1.1.1]propellane undergoes facile free radical addition reactions. 1,3-Diiodobicylo [1.1.1] pentane was synthesised by irradiating [1.1.1]propellane and 1_(2) in ether/hexane(1:5) The reaction of 1,3-Diiodoboicyclo[1,1,1]pentane with Sodium sulfide produced unexpected products (ring opening product, linear polimer). But we tried thes reaction under high dillution for inhibition of polymerization These products were separated by preparative G.C and TLC and characterized by H-NMR, GC-MS, ^(13)C-NMR
정원우,이윤종,강용희,윤일희,이우붕,손종경,김중욱,강동진,권용주 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-
The purpose of this study is to investigate the status of the experimental and practical education in high school general science. The present status and reasonable management of the experimental and practical education in high school general science were evaluated by the questionaires. To do this, 146 science teachers in Korea are administered questionaires. The frequency of the experimental and practical items in the seven kind of general science text books were investigated. The problems and the reasonable management for experimental and practical education were proposed in this paper.
[1.1.1.1]Paddlane과 할로겐 화합물과의 반응
李愚鵬,吳東元,黃悳海,權明淑,鄭宰準 慶北大學校 師範大學 科學敎育硏究所 2002 科學敎育硏究誌 Vol.26 No.-
[1.1.1]Paddlane has an inverted structure at two bridge-head carbon atoms. We will describe the reaction of [1.1.1]Paddlane and [1.1.1.1]Paddlane. The reaction of [1.1.1]propellane with singlet methylene affored 1,3-Dimethylene as the major product and [1.1.1.1]paddlane as the minor products were obtained. The reaction of [1.1.1]propellane with triplet methylene was carried out in the similar conditions. The result afforded 1,3-Dimethylenecylopropane as the major product and various side products were also obtained. But no trace of [1.1.1.1]paddlane was detected. After the synthesis of [1.1.1.1]paddlane, continuously [1.1.1.1]paddlane reacts with iodide. The product that I expected for 1,3-diiodo-tricyclo[1.1.1.1]hexane is different. and has unsymmetrical structure.
이우붕,정원우 慶北大擧校 師範大學 科學敎育硏究所 2000 科學敎育硏究誌 Vol.24 No.-
Humus serves important purposes in the life of soil, all of which contribute to its fertility. It retains essential plant nutrients such as potassium, nitrogen and phosphorus. It holds moisture easily and so prevents soils from drying out rapidly. It also keeps soil porous and permits the ready flow of air needed for root growth. The pores also help in the percolation of water downward to provide good drainage. The middle school program of education with environment should be action oriented program between knowledge and attitude, which means from knowledge to action. The aim of open class education with environment program must consist of structural system mode(fact·concept·generalization), pedagogy(explanation·participation) and evaluation(criticism·prediction).