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이복희(B.H. Lee),정현욱(H.U. Jung),이태형(T.H. Lee),백영환(Y.H. Baek),이동문(D.M. Lee),정동철(D.C. Jung),안창환(C.H. Ahn) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.11월
This paper describes the touch voltages and potential distributions according to the distance between distribution concrete pole and ground rod when the current is injected to a ground rod through overhead ground wire. Touch voltage is measured in four directions. The touch voltage and ground potential distribution per 1 A are analyzed. The touch voltage was the highest at the ground surface just above the ground rod.
TBCC를 위한 CVC 엔진의 데토네이션 현상 기초 연구
최정열(J.-Y. Choi),Bernard Parent,조덕래(D.-R. Cho),강기하(K. Kang),신재렬(J.-R. Shin),이수한(S.-H. Lee),이태형(T.-H. Yi) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
DARPA가 계획 중인 대형 극초음속 추진 기관 개발 프로그램 VULCAN 프로그램은 듀얼모드 램제트/스크램제트 엔진과 연계되어 TBCC엔진을 이룰 수 있도록, 기존의 터보제트(또는 터보팬) 엔진과 CVC과 엔진을 결합하여 마하수 4이상에서 작동 가능한 엔진을 개발하는 것을 목표로 하고 있다. CVC 엔진은 데토네이션 연소 현상을 기본으로 하여 고마하수에서 고효율을 얻을 수 있는 PDE 이나 CDE와 같은 신개념의 엔진이다. 본 논문에서는 부산대학교 항공우주공학과 연소 추진 연구실에서 지난 수년간 국제공동 연구의 형태로 수행한 데토네이션 현상의 추진기관 응용에 연구에 대하여 소개한다. DARPA"s hypersonic propulsion program VULCAN is aimed for development of Mach 4+ capable engine by combining current production turbofan engine such as F119 with CVC (Constant Volume Combustion) engine. Final goal is a TBCC(Turbo-based Combined Cycle) engine by combining with dual mode ramjet/scramjet engine. CVC is a common designation of new concept of high efficiency engines, such as Pulse Detonation Engine (PDE) or Continuous Detonation Engine (CDE), which use the detonation as a combustion mechanism. Present paper introduces the internationally collaborative research activities carried out in Aerospace Combustion and Propulsion Laboratory of the department of Aerospace Engineering of the Pusan national University.
장성기(S.K Jang),박숙영(S.Y Park),권기동(K.D Kwon),천재영(J.Y Chun),이태형(T.H Lee) 한국실내환경학회 2007 한국실내환경학회지 Vol.4 No.2
Young children health problem were reported in a Korean daycare centers and supposedly attributed to the presence of air pollutants. This study attempted to characteristics of carbonyl compounds exposure of young children at the indoor spaces. The characteristics associated with the major indoor pollutants exposure included seasonal variation, and room location inside a daycare centers. As the results of investigation for daycare centers, the mean concentrations of formaldehyde, acetone, and acetaldehyde in daycare centers were 38.3㎍/㎥, 33.9㎍/㎥, 13.6㎍/㎥, respectively. The indoor space carbonyl compounds concentrations were both higher for the summer than for the other seasons. The temperature and relative humidity measured along with the volatile organics measurements temperature and relative humidity increase volatile organics levels. This last suggestion is further supported by the correlations of the carbonyl compounds measured for daycare centers. Significant correlations between carbonyl compounds were exhibited for both the temperature and humidity, with at least p<0.05. The concentrations of formaldehyde in classroom were higher than lobby or dining room. Therefore, controlling indoor air pollutants exposure in daycare center should be given a high priority so as to minimize the potential sources of air pollutants in indoor space.
이태형 영남대학교의과대학 1995 Yeungnam University Journal of Medicine Vol.12 No.2
난소부전 여성에서의 난자공여 시술은 난관요인 등 다른 불임 원인에 의한 체외수정 시술보다 비교적 늦게 시작되었으나 임신율에 있어 비슷하거나 오히려 우월하므로, 의료 기술적으로는 거의 완숙 단계에 달한 것으로 생각된다. 그러나, 난자수용 여성의 연령 제한, 가까운 혈연 간의 난자 공여, 난자공여 여성의 익명 유지 등 의료 윤리적인 문제점에 대해서는 아직, 사회적인 합의를 보지 못하고 있으므로, 향후 나라마다 각각 서로 다른 문화적, 종교적 배경에 따라 난자 공여에 관한 일반적인 지침이 설정되어야 하며, 난자공여에 수반되는 기타 제반 문제점에 대한 법률적인 뒷받침도 시급히 이루어져야 할 것으로 생각된다.
2XXX Al/SiCw 복합재료의 2 상 입자들이 파괴 성질에 미치는 영향
이성학,김영환,이태형,조경목 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.11
The purpose of this study is to explore the effects of the matrix alloy composition on fracture properties of the 2124 and the 2009 Al/SiCw composites and to attempt to assess the corresponding role of second phase particles such as coarse Mn-containing intermetallic particles. The contents of Mn and Fe were significantly reduced in the composition of the 2009 matrix alloy with respect to that of the 2124 alloy. Tensile tests, fracture tougness test and in-situ SEM fracture observations were conducted on these two composites. Experimental results indicated a higher toughness in the 2009 Al/SiC composite, although strengths were slightly decreased. The observations of fracture processes showed that coarse Mn-containing particles were cracked first and accentuated the formation of shear bands. Thus the improvement of fracture toughness in the 2009 Al/SiCw composite could be interpreted by the increase of the spacing between effective fracture initiation sites due to the absence of coarse Mn-containing particles. It is also suggested that another possible way of improving fracture toughness is to use SiC particulates as reinforcements instead of whiskers in order to modify the composite microstructure.