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李文秀 慶尙大學校生産技術硏究所 1987 生産技術硏究所論文集 Vol.3 No.-
The noise figure of the MMIC distributed amplifier can be analyzed for lossless case when we neglect the losses on the gate and drain transmission lines and for lossy case when we consider the losses on the gate and drain transmission lines of the distributed amplifier. The calculated noise figures in both cases are compared with the experimental results. At higher frequencies the calculated noise figure is quite agreement with the measured one while there is a nice bit of discrepancy between the two noise figures at lower frequencies.
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황색종 잎담배의 건조과정중 비휘발성 유기산과 지방산의 변화에 관한 연구
이문수,이운철,Rhee, Moon-Soo,Lee, Un-Chul 한국연초학회 1982 한국연초학회지 Vol.4 No.2
During the process of curing of the tobacco (Nicotiana tabacum L. ) leaves the concentration change of Nonvolatile organic acids and Higher fatty acids of the flue-cured tobacco leaves was observed. The contents of Nonvolatile organic acids in flue-cured tobacco leaves were as follows, malic> oxalic>malonic>citric>succinic acid. Higher fatty acids was linolenic>Palmitic>oleic >stearic$\geqq$linoleic acid, Citric acid content of last curing time was increased about 4~5 times in compare to before curing tobacco. It was concluded that significant changes of three variety flue-cured tobacco but a significant difference was observed in the composition of Daegu gold variety.
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Gas Chromatography에 의한 잎담배와 담배연기응축물 중의 유기산 정량
이문수,이운철,오세열,이규서 한국연초학회 1983 한국연초학회지 Vol.5 No.1
A gas chromatographic procedure is described which permits seperation and determination of nonvolatile organic acids and higher fatty acids simultaneously in tobacco leaves and cigarette smoke condensate. The transfer rates from cigarettes to main stream smoke were examined for eight of the nonblending cigarettes. Average transfer rates for three varieties tobacco leaves, respectively were linolenic 31 and 62% linoleic 21 and 59% palmitic 29 and 38% malic 4 and 6%. Gas Chromatography를 이용하여 잎담배와 연기응축물 중의 비휘발성유기산과 지방산을 정량 분석하였다. 특히 이들 유기산들은 단엽담배일 때 주류연으로 이행율을 조사하였는 바 linolenic acid, 31~62%, linoleic, 21~59% palmitic 29~38%, malic acid 4~6% 정도의 이행율을 보였다.
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멘톨담배의 $\ell$-Menthol 이행에 관한 연구
이문수,임흥빈,조시형,김성한,박영수 한국연초학회 1989 한국연초학회지 Vol.11 No.1
A study was made of the puff-by-puff delivery of menthol and tar for several commercial brands. The purpose of this study is for the brands constantly to maintain fresh aroma of menthol till the last puff in smoking. The results from this study could be used for development and evaluation of a mentholated cigarette. Prior to the purpose, a straightforward method from extraction through quantitative analysis of 9-menthol contained in cigarettes has been developed.
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잎담배중 $\alpha,\beta$-4,18,13-Duvatriene-1,3-diols의 분리확인
이문수,이운철,박진우 한국연초학회 1982 한국연초학회지 Vol.4 No.1
4, 8, 13-Duvatriene-1, 3-viols have been identified in the cuticular lipid of fresh Sohyang (aromatic cultivar) tobacco leaves. Their $\alpha, \beta$-isomers were directly separated by SE-54 glass capillary column and identified by mass spectrometry. Gas chromatographic analysis revealed that the duvatrienediols are major components in the culticular lipid of Nicotiana Tabacum.
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담배연기 응축물중 phenolic fraction의 분리와 확인
이문수,임흥빈,장기철,Rhee, Mun-Su,Lim, Heung-Bin,Jang, Ki-Cheol 한국연초학회 1988 한국연초학회지 Vol.10 No.1
The phenolic compounds were isolated from the cigarette smoke condensate using two immiscible organic solvents by a partition coefficient. Of them, 20 phenolic compounds were identified by GC and GC/MS. The amount of the phenolic compounds was phenol, p-crestol, hydroxybensoic acid in order. And there was no difference in composition of these compound dependent on leaf tobacco . About 70% amount of these compounds were absorbed to cellulose acetate filter used. The contents and composition of these compounds were various in the commercial cigarette.
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Cis-9-Octadecenoic acid와 trans-9-Octadecenoic acid의 열분해에 관한 연구
이문수,이운철,곽재진,Lee, Moon-Soo,Lee, Un-Cheoul,Kwag, Jae-Jin 한국연초학회 1987 한국연초학회지 Vol.9 No.1
The pyrolysis of geometrical isomers of 9-octadecenoic acid were conducted at $600^{\circ}C$ under nitrogen, and its pyrolytic behaviors were investigated. The pyrolytic products of both fatty acids, cis-9-octadecenoic acid(oleic acid) and trans-9-octadecenoic acid(elaidic acid), were analyzed using a gas chromatograph and GC/MS spectrometer. Twenty-seven different compounds were identified from these pyrolyzates, and the chief products of them were ketones, alcohols and aromatic hydrocarbons. And also, the pyrolytic mechanisms of two geometrical isomers of this fatty acid were discussed by a comparison of experimental results.
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유리모세관칼럼에 의한 담배연기응축물중의 cis-trans형 지방산의 분리정량에 관한 연구
이문수,이운철,김찬호,Rhee, M.S.,Lee, U.C.,Kim, C.H. 한국연초학회 1985 한국연초학회지 Vol.7 No.1
Cis-trans forms of fatty acids in cigarette smoke condensate were separated and characterized using SP 2340 glass capillary gas chromatography. The transforms of fatty acids, palmitoeladic , 1-vaccenic, eladic and linoeladic acid were identified. These components were not present only 3% of the total fatty acid fraction, but they showed a very low transfer rate.
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황색종 잎담배 (N. tabacum L.)의 유기산과 숙도에 관한 연구
이문수,김찬호 한국연초학회 1984 한국연초학회지 Vol.6 No.1
The changes of contents of organic acids in flue-cured tobacco leaves depending on stalk position and maturity viz immature, mature and overmature were studied in 1982-83. Among them, particularly, the leaves harvested at mature stage have the lowest amounts of oxalic and citric acids in smoking or cutter leaves but the acid contents has increased during the overmature. The linolenic acid content tended to be lower with increase of maturity.
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Glycyrrhizic acid 와 Glycyrrhetinic acid의 열분해에 관한 연구
이문수,김옥찬 한국연초학회 1986 한국연초학회지 Vol.8 No.2
The Pyrolytic behavior of glycyrrhizic acid and glycyrrhetini c acid, which are natural flavorants for manufactured cigarettes was observed to find its contribution to the smoke composition. Pyrolyzates of them at 800t were identified using a gas chromatography and a mass spectrometer. According to the analysis of the pyrolytic Products, 43 different compounds were identified Among them the aromatic hydrocarbon compounds were found to be the major products.
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