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공동주택의 방화문 방・내화성능 기준 및 유지관리 개선 연구
이오성,신만중 사단법인 한국건설법무학회 2023 건설법무 Vol.9 No.-
Due to defects in fire performance of apartment fire doors, lawsuits for defects are expanding, and in the event of a fire, it can be fatal. However, the current legislation is negligent in dealing with this. In this study, we intend to suggest improvement plans for the problems revealed in the 『Steel Window Manufacturing/Quality Inspection Manual』, which well reflects the defects and characteristics of fire doors, and the LH design / specification revision work. If the appropriate unit price of fire doors is calculated, the useful life is reasonablyadjusted, and related regulations such as the 3-step inspection system are established and operated, it is judged to greatly contribute to improving the quality of fire doors and protecting residents in case of fire.
장직쇄상(長直鎖狀) 불포화 초산화합물의 합성에 관한 연구
오성기 한국농화학회 1976 Applied Biological Chemistry (Appl Biol Chem) Vol.19 No.1
The female moths of Lepidoptera comprising over 1,000,000 described species possess long-chain unsaturated alcohols or esters as the typical structure of potential sex attractants. In this experiment, various stereoisomers of C_(16)-unsaturated acetates were synthesized for potential sex attractants; e.g., CH₃(CH₂)_m^(++)CH=CH(CH₂)_nOR (m=0-12, n=1-13, R=H and -COCH₃). Seventeen acetates were spectrometrieally examined so that the data would provide a ready catalog of gas chromatography and mass spectrometric data for comparison with natural insect sex attractants. Exclusively cis and traps isomers were obtained by the catalytic and chemical reduction methods, respectively. Commercially available CH₃(CH₂)_mBr, CH₃(CH₂)_mC◎CH, HC◎C(CH₂)_nH and HO(CH₂)_n OH were used for the synthetic starting material. 1-Alkynes, CH₃(CH₂)_m C◎CH exceeding nine methylene groups did not condense with alkyl dihalides. The yield of coupling products was gradually decreased with increasing the molecular weight of diols. In the coupling reaction of BrCH₂CH₂ OTHP with acetylene gas, the tetrahydropyranyl ether of bromohydrin produced undesirable elimination product. In this experiment, it seems that p-toluenesulfonic acid is greatly favoured hydrolyzing agent over dilute sulfuric acid in the hydrolysis of the tetrahydropyranyl ether of long-chain alkynols.