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이학기,이재영 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.11
The Quality Cost that is the total cost of consumed cost to manage the quality and additional cost from the failure of Quality Management can be defined by the differences of real cost and consumed cost used for materializing Quality without any wastefulness. After the introduction of Juran's Quality Cost from "Quality Control Handbook" in 1951, many scholars have studied about Quality Cost. But, the studies are still the basic-step in the research in domestic and foreign academic world.This study suggests a preference task for research and analysis in the comprehension and application of Quality Cost by construction engineers, so, it aims to be applied for the basic-study to organize the Construction Quality cost System.To research the current situation in the application of Construction Quality Cost, we divided 5 answering groups that are owners, general construction company, designer, supervisor and special construction company to research the analysis about the recognitions, situations, applied status and cost presumption of Quality Cost and finally suggest 4-aspects 14 items those are problems in the operation and foundation of the Construction Quality Cost System.
李學沂 慶北大學校 師範大學 1964 敎育硏究誌 Vol.2 No.-
Up to the present time organic experiments in universities and colleges have followed the macro-system. Now it is time to think of the possibility of adopting the semimicro system for organic experiments in accordance with the general tendency. The educational purpose of organic experiments in the macro-system is to learn the basic operations which are applicable after graduation, while the purpose of the semimicro system is to learn organic chemistry itself through a large number of experiments according to the principle of "learning by doing". The large number of experiments is made possible by the solvings in cost and time resulting from use of the semimicro methods. In order to plan for organic experiments by the semimicro system, the author investigated certain points. The results are as follow: 1. Semimicro experiments reduce expenses to 1/5. 2. Semimicro experiments reduce the time to 1/9. 3. Students in our University can do 60 different experiments during the 60 lab. hours in one semester as compared with 10 macro experiments.
李學沂,林龍進,沈相喆 경북대학교 공과대학 1971 工大硏究誌 Vol.1 No.-
The pyrolysis of dry lithiun salt of fumaraldehyde tosylhydrazone which was prepared by reacting fumaraldehyde and tosylhydrazine was studied. The products of therm a decomposition, acetylene, ethytlene and unidentified gaseous substances, were separated by GC to learn the ratio of the products which was variable according to the reaction conditions. The investigaton of the path route to form acetylene, ethylene and unidentified compounds remains for further work to learn the mechanism of tetrahedrane formation.
이학기,임용진,민경은,최흥진,Hak-Ki Lee,Yong Jin Lim,Kyung Eun Min,HeungJin Choi 대한화학회 1984 대한화학회지 Vol.28 No.6
We obtained fast dyed polypropylene fiber, which has no functional group to be dyed, by producing a carbene on the dye molecule by the pyrolysis of lithium salt of dye molecule-tosylhydrazone, then the carbene simultaneously inserted into a C-H bond of polypropylene. To investigate the possibility of actual use in the industry, a variety of reactive azo dyes were prepared from aldehyde, acetophenone and benzophenone derivatives by changing reactive site of precursors which greatly affected properties of dyes. Reactive dyes of the benzophenone derivatives were excellent in the reaction with polypropylene, especially, a dye prepared from chloroaminobenzophenone with N,N-dimethyl aniline was found most excellent. 難染性纖維인 폴리프로필렌用 反應性染料를 開發하기 위하여 反應部位로서 카르벤을 染料에 生成케하여 폴리프로필렌의 C-H結合에 揷入反應을 시켜 堅固한 染着物을 얻을 수 있었다. 反應性카르벤染料의 前驅體로서 알데히드係, 메틸케톤係 및 페닐케톤係 反應性染料를 合成하고 카보닐基에 토실히드라진 및 부틸리튬을 各各 作用하여 各種染料의 토실히드라존리튬鹽을 만들어 폴리프로필렌상에서 加熱分解시킴으로써 染料分子에 生成된 카르벤이 폴리프로필렌에 共有結合을 하여 染着하였다. 여기에서 合成한 各種 카르벤染料들은 카르벤이 生成되는 隣接位에 있는 置換基의 種類와 位置에 따라 反應性에 差異點을 나타내었다. 특히 페닐케톤係 反應性染料가 反應性이 優秀하였으며 이들 페닐케톤係 反應性染料의 前驅體中에서도 클로로基를 가지는 클로로아미노벤조페논으로부터 合成한 染料가 他에 비해 反應性이 良好하였다.
1,4-Bisdiazo-2-butene의 合成과 그 化學的 性質의 硏究
이학기,Hak-Ki Lee 대한화학회 1969 대한화학회지 Vol.13 No.4
Synthesis and chemical properties of 1,4-bisdiazo-2-butene have been studied. 1,4-Bisdiazo-2-butene which was very unstable produced in protic solvents 1,3-butadiene and one unidentified substance instead of ring compounds. The reaction in aprotic solvents remains for further investigations.
2-Vinylpyridine과 Methylmethacrylate의 Anion共重合
李學沂,金祐埴,鄭明秀 慶北大學校 1975 論文集 Vol.20 No.-
2-Vinylpyridine and methylmethacrylate were copolymerized with n-butyllithium as an initiator in n-hexane at o˚ to determine the reactivity ratio of this monomer system. r_1=0.041(2-vinylpyridine) r_2=1.14 (methylmethacrylate) From the reactivity ratio and Q-e value, it was known that the copolymerization of this monomer system is anionic and controlled by the polar effect of the monomer.
重金屬Ion과 Chelate를 形成하는 Aminocarboxylic Acid 樹脂의 合成
李學沂,金祐埴,민경은,權五亮 慶北大學校 1980 論文集 Vol.29 No.-
Crosslinked polyacrylamide was prepared from acrylamide and divinylbenzene by the radical polymerization in methanol to prepare crosslinked polyvinylamine by the Hofmann reaction. Crosslinked aminocarboxylic acid resin was finally prepared by the reaction of crosslinked polyvinylamine and chloroacetic acid. The adsorption of crosslinked aminocarboxylic resin for Cu^+2, Zn^+2, Ni^+2, and Co^+2 varies with pH and the resin shows a high adsorption in the range of pH 6-7. The order of adsorption for heavy metal ions was Cu^+2>Zn^+2>Ni^+2>Co^+2 at the above pH region.
李學沂,金鴻洛,李信雄 慶北大學校 1987 論文集 Vol.44 No.-
There are numerous ways in the generation of carbene intermediates. The decomposition of diazo compounds is a quite general reaction for the carbene formation. However, the synthesis of the required diazo compounds has sometimes a limitation because the diazo compounds are unstable. The cis-form of hydrazone of substituted unsaturated 1,4-diketone usually gives substituted pyridazine which is not easily decomposed to produce carbene by heat or light. In this study, trans-1,2-dibenzoylethlene was prepared from maleic anhydride via three steps. Tosylhdrazones were obtained from the reaction of tosylhydrazine with t-1,2-dibenzoylethylene in THF. The tosylhydrazone of the ketone was reacted with base catalyst to give diazo compound, 1,2-bis (diazobenzoyl) ethylene in DMF with loss p-tolunesulfinate.