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민경원,서백수,진호일,임길재 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-
화강암의 조직을 고려하여 4개지역에서 6개 석ㆍ골재 석산을 대상으로 신선한 화강암과 풍화된 화강암을 Ⅰ ~ Ⅵ단계까지 체계적으로 채취된 화강암을 대상으로 풍화에 따른 화강암의 물리적ㆍ화학적 특성 변화에 대한 고찰(민경원 등, 1998)에 추가하여, 풍화에 의한 slake 내구성과 색도의 변화를 측정하고 토의하였다. slake 내구성 시험에서는 일반적으로 Ⅰ~Ⅲ 단계의 화강암이 시험 주기가 증가할수록 선형적이 질량감소를 보이고 Ⅳ~Ⅵ 단계에서는 곡선 모양의 감소 경향을 보여주면 세립질의 화강암이 상대적으로 높은 내구성을 가진다. 풍화에 따라 암석의 백색도는 감소하고 황색도는 증가하며, 표준화된 백색도-황생도 지수는 풍화단게를 지시해 줄 수 있는 유용한 지시자로 제안되었다. Fresh and weathered granitic rocks of grades Ⅰ to Ⅵ were sampled systematically from six stone and aggregate quarries in four chosen areas in consideration of their textures. In addition to the observed variations. of physical and chemical properties of granitic rocks in terms of weathering grades(Min et al., 1998), slake durability and color index variations were measured and discussed in this article. In the slake durability test, generally with increasing test cycles the granitic rocks of grades Ⅰ to Ⅲ show linear losses of weight but those of Grades Ⅳ to Ⅴ show curvilinear trends, and the fine-grained weathered granitic rocks have comparatively higher durability. As weathering proceeds, whiteness of rocks decreases and yellowness increases. A normalized whiteness-yellowness index is suggested as a weathering index to be one of useful indicators of weathering grades.
송민정,기노갑,장길수,김선우 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10
A sound classification system for floor impact sound insulation performance is needed to secure comfortable acoustical quality in apartment houses To achieve this goal, psycho-acoustic experiments were earned out with the sound sources of standard light and heavy impact source in a laboratory As a result of this study, followings are suggested 49dB for light impact sound source and 46dB for heavy impact sound source are recommended minimum level for inhabitants And level differences between classes are 5dB But the situation of sound insulation performance against floor impact sounds can't meet this recommended level Due to these kinds of matters, foreign countries set the minimum class 58dB for light impact source(Europe) and 55dB for heavy impact source(japan) So, the sound insulation classification system in which its minimum class are 58dB(light), 55dB(heavy) and its interval is 5dB is suggested And arithmetic mean value of testing frequencies shows a good relation coefficient between subjective response and rating value both in light and heavy impact sound source
마이셀 용액에서의 Diethyl Vinyl Phosphates의 산촉매 가수분해 반응에 관한 연구
유영길,이수민,김일광 圓光大學校 基礎自然科學硏究所 1982 基礎科學硏究誌 Vol.1 No.1
For the acid catalyzed hydrolysis of diethy1 viny1 phosphate and diethy1 isopropeny1 phosphate, the rate constants for diethy1 isopropeny1 phosphate is greater than that for diethy1 viny1 phosphate. Consistently, methy1 group has more effect of electron donating than proton. Both anionic and cationic detergents enhance the reaction rate respectively. Especially it shows that anionic micelles stabilization between micelles and viny1 phosphates, diethy1 isopropeny1 phosphate is less effective than diethy1 viny1 phosphate because of the steric hindrance.
허민이수근,김종길,이수근 大韓神經精神醫學會 1990 신경정신의학 Vol.29 No.4
This study was conducted to determine the electrocardiographic effects during modified electroconvulsive therapy. A series of 22 patients were submitted to 228 electric convulsions which had been modified by he intravenous injection of ultra-short-acting barbiturates and muscle relaxant. Electrocardiograms were taken before, during and after(4 and 1/2 hours later) the convulsive stage. During convulsive stage, a marked degree of sinus tachycardia was usual, S-T segment depression(2 mm. or more) developed in four cases and sinus arrhythmia was recorded in one case. These irregularities disappeared after convulsive stage. In 3 cases with clinical or electrocardiographic evidence of mild heart diseases, no serious cardiovascular disturbance occurred. With this study results, we conclude that modified electroconvulsive therapy is safe if we follow precautions of treatment procedures.
장길수,송민정 동신대학교 환경연구소 1998 환경연구 Vol.3 No.1
ISO(국제표준화기구)는 120여개국이 참여하는 세계적인 기구이다. 각종 기술위원회에서는 산하조직에 597개의 분과위원회(SC : Sub-Committee)와 작업반(WG : Working Group)을 두고 국제규격의 제정, 수정 및 개정 둥의 업무를 수행하며, 그 결과로서 ISO규격이 작성된다. 본 조사연구는 IS0/TC43/SC2(건축음향)의 주요 활동사항을 정리해 보았다. ISO(the International Organization for Standardization) is a worldwide federation of national standards bodies, from some 120 countries. The technical work of ISO is highly decentralized, carried out in a hierarchy of some 2,700 technical committees(TC), sub-committees(SC) and working groups(WG). The results of the ISO work are published as International Standards. In this paper, main fields of work at the ISO/TC43/SC2 are described.
교류전해에칭용 에틸렌글리콜의 알루미늄박판의 부식억제 효과
박성민, 양정진, 김홍일, 김한주, 김성한, 신진식, 박수길 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1
In this study, additions of aluminium foil eching characteristics were compared with sulfuric acid for capacitor. sulfuric acid and ethylene glycol is used as addition, characteristics of funtional group from addition were guessed by comparing of aluminium foil eching characteristics. When sulfuric acid was added in HCI etching solution, corrosion of aluminum metal was inhibited by the chemical adsorption of sulfate ion, when ethylen glycol was added in HCI etching solution, corrosion inhibited by the chemical adsorption of OH^ion.
최민수,정길수,박병수,유남재 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B
This paper is the results of experimental and numerical works on analyzing the geotechnical engineering behavior and characteristics of excavated clay slope formed by the method of excavated replacement which is one of treatments in soft soil ground. For the centrifuge model tests, models of excavated clay slope were prepared by remolding the marine clayey soil sampled from the field. Tests were performed with changing the slope to investigate the behavior of them. On the other hand, numerical analyses were carried out to analyze the change of safety factor against instability of slope with time. Changes of pore water pressure, shear strength and displacement were also investigated. As results of centrifuge model tests with slopes of 1:1.5 and 1:3 using the confining body of simulating the effect of excavation, for the case of 1:1.5, slope failure occurred right after remove the confining body whereas relatively small displacements within the range of 3.2mm, implying to maintain the stability of slope, were observed for the case of 1:3 slope. From the results of numerical analyses using the software of PLAXIS to investigate the stability of slope after excavation, the minimum safety factor against slope failure was 1.28 for the case of 1:3 slope. The further researches in the future are required with considerations of build up of static pore water pressures during acceleration of centrifuge, depth of excavation influencing the behavior of the slope and permeability of the slope since excavation of the slope was not simulated well resulted from the limitations of apparatus at the stage of excavation during the centrifuge tests.