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김경석,김영훈,한정인,최광남,곽성관,김동식,정관수,Kim, K.S.,Kim, Y.H.,Han, J.-In,Choi, K.N.,Kwak, S.K.,Kim, D.S.,Chung, K.S. The Korean Vacuum Society 2008 Applied Science and Convergence Technology Vol.17 No.5
본 논문은 TIPS Pentacene을 유기반도체로 사용한 유기박막 트랜지스터의 용제에 따른 전기적 특성에 대한 연구로서, 용제로는 chlorobenzene, p-xylene, chloroform, toluene을 사용하였으며, 회전 도포 방법을 사용하여 TIPS pentacene을 혼합하여 적층하였다. chlorobenzene을 사용하여 만들어진 유기박막 트랜지스터는 $1.0{\times}10^{-2}cm^2/V{\cdot}s$의 전계효과 이동도, $4.3{\times}10^3$의 on/off 비율, 5.5 V의 문턱전압의 특성을 보였다. 반대로, chloroform을 사용하여 만들어진 유기박막 트랜지스터는 $5.8{\times}10^{-7}cm^2/V{\cdot}s$의 전계효과 이동도, $1.1{\times}10^2$의 on/off 비율, 1.7 V의 문턱전압의 특성을 보였다. 또한 각 용제에 따른 TIPS pentacene 결정크기를 AFM을 통하여 측정하였다. 이와 같은 결과들을 통하여, 더 높은 끊는점을 가진 용제는 TIPS Pentacene의 더 큰 결정 크기와 높은 결정화 성향으로 인하여 더 좋은 전기적 특성을 가지는 것을 확인할 수 있었으며, 본 실험에서는 끓는점이 가장 높은 chlorobenzene을 사용한 TIPS Pentacene 유기박막 트랜지스터가 가장 좋은 전기적 특성을 나타내는 것을 확인하였다. In this paper, we investigated the electrical properties of triisopropylsilyl (TIPS) pentacene organic thin-film transistor (OTFT) depending on solvent type. We spin coated TIPS pentacene by using chlorobenzene, p-xylene, chloroform, and toluene as solvents. Fabricated OTFT with chlorobenzene shows field-effect mobility of $1.0{\times}10^{-2}cm^2/V{\cdot}s$, on/off ratio of $4.3{\times}10^3$ and threshold voltage of 5.5 V. In contrast, with chloroform, the mobility is $5.8{\times}10^{-7}cm^2/V{\cdot}s$, on/off ratio of $1.1{\times}10^2$ and threshold voltage of 1.7 V. Moreover we measured the grain size of each TIPS pentacene solvent by atomic force microscopy (AFM). From these results, it can be concluded that a solvent with higher boiling point results in better electrical characteristics due to large grain size and high crystallinity of TIPS pentacene layer. In this paper TIPS pentacene with chlorobenzene shows the best electrical properties.
혈액투석중인 만성신부전 환자의 사망률에 영향을 미치는 요인부석
김경석(K . S . Kim),김진구(J . G . Kim),우상태(S . T . Woo),서상렬(S . Y . Suh),김향(H . Kim),권영주(Y . J . Kwon),표희정(H . J . Pyo),김용섭(Y . S . Kim),차대룡(D . R . Cha),조원용(W . Y . Jo),김형규(H . K . Kim),김창수(C . S . Kim),박 대한내과학회 1998 대한내과학회지 Vol.54 No.3
N/A Background: Several factors have been influenced to mortality of patients with end-stage renal disease treated with hemodialysis. We performed this study to evaluate the factors influencing to mortality in chronic hemodialysis patients in eight hemodialysis centers. Method: We analyzed retrospectively the demographic characteristics, risk stratification, Kamofsky scale, regularly tested laboratory finding(CBC, Blood chemistry), hospitalization rate, and gross mortality among 150 patients from June, 1994 to June 1996. Results: 1) A total of 150 patients were enrolled, male 91 and female 59 and mean age was about 53 years. 43 patients had diabetes and 107 patients had nondiabetes. The mean duration of hemodialysis was 48.2±24.7 months(range, 9-123months), 2) 82 patients(54.7%) required hospitalization during the 2 year follow-up period and the most common cause of hospitalization was cardiovascular disease. 3) A total of 43 patients(28.7%) had been died during the 2 year follow-up period and the most common cause of death was cerebrovascular disease. 4) In univariate analysis, advancing age, Kamofsky scale(<80 points), diabetic nephropathy as the underlying cause of ESRD, comorbid illness, high risk group in risk stratification, total HD duration, HD length per week, low serum albumin and creatitine concentration were all associated with significantly increased risk of death. In multivariate analysis, diabetic nephropathy as the underlying cause of ESRD and low serum albumin concentration were more highly associated with death probability. Conclusion: We conclude that diabetic nephropathy as underlying cause of ESRD and serum albumin concentration are more important elements in determining patient mortality.
K. S. Kim(김경석),Y. H. Kim(김영훈),J. In. Han(한정인),K. N. Choi(최광남),S. K. Kwak(곽성관),D. S. Kim(김동식),K. S. Chung(정관수) 한국진공학회(ASCT) 2008 Applied Science and Convergence Technology Vol.17 No.5
본 논문은 TIPS Pentacene을 유기반도체로 사용한 유기박막 트랜지스터의 용제에 따른 전기적 특성에 대한 연구로서, 용제로는 chlorobenzene, p-xylene, chloroform, toluene을 사용하였으며, 회전 도포 방법을 사용하여 TIPS pentacene을 혼합하여 적층하였다. chlorobenzene을 사용하여 만들어진 유기박막 트랜지스터는 1.0×10?² ㎠/Vㆍs의 전계효과 이동도, 4.3×10³의 on/off 비율, 5.5 V의 문턱전압의 특성을 보였다. 반대로, chloroform을 사용하여 만들어진 유기박막 트랜지스터는 5.8×10?? ㎠/Vㆍs의 전계효과 이동도, 1.1×10²의 on/off 비율, 1.7 V의 문턱전압의 특성을 보였다. 또한 각 용제에 따른 TIPS pentacene 결정크기를 AFM을 통하여 측정하였다. 이와 같은 결과들을 통하여, 더 높은 끊는점을 가진 용제는 TIPS Pentacene의 더 큰 결정 크기와 높은 결정화 성향으로 인하여 더 좋은 전기적 특성을 가지는 것을 확인할 수 있었으며, 본 실험에서는 끓는점이 가장 높은 chlorobenzene을 사용한 TIPS Pentacene 유기박막 트랜지스터가 가장 좋은 전기적 특성을 나타내는 것을 확인하였다. In this paper, we investigated the electrical properties of triisopropylsilyl (TIPS) pentacene organic thin-film transistor (OTFT) depending on solvent type. We spin coated TIPS pentacene by using chlorobenzene, p-xylene, chloroform, and toluene as solvents. Fabricated OTFT with chlorobenzene shows field-effect mobility of 1.0×10?² ㎠/Vㆍs, on/off ratio of 4.3×10³ and threshold voltage of 5.5 V. In contrast, with chloroform, the mobility is 5.8×10?? ㎠/Vㆍs, on/off ratio of 1.1×10² and threshold voltage of 1.7 V. Moreover we measured the grain size of each TIPS pentacene solvent by atomic force microscopy (AFM). From these results, it can be concluded that a solvent with higher boiling point results in better electrical characteristics due to large grain size and high crystallinity of TIPS pentacene layer. In this paper TIPS pentacene with chlorobenzene shows the best electrical properties.
레이저 스페클간섭법에 의한 STS430의 열팽창계수 측정
김경석(K.S. Kim),이항서(H.S. Lee),정현철(H.C. Jeong),양승필(S.P. Yang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper presents ESPI system for the measurement of thermal expansion coefficient of STS430 up to 1,000℃ Existing methods, strain gauge and moire have the limitation of contact to object and do not supply the coefficient up to 800℃ There needs to measure the data up to 800℃ because heat resistant materials have high melting temperature up to 1,000℃ In previous studies related to thermal strain analysis, the quantitative results are not reported by ESPI at high temperature, yet. In-plane ESPI and vacuum chamber for the reduction of air turbulence and oxidation are designed for the measurement of the coefficient up to 1,000℃ and speckle correlation fringe pattern images are processed by commercial image filtering tool-smoothing, thinning and enhancement- to obtain quantitative results, which is compared with references data. The comparison shows two data are agreed within 4.1% blow 600℃ however, there is some difference up to 600℃ Also, the incremental ratio of the coefficient is changed up to 800℃ The reason is the phase transformation of STS430 probably begins at 800℃.
Duplex STS 후판 압연시 발생하는 상향 벤딩 해석
김경석(K. S. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Because of the significant increase in Ni price recently, the duplex stainless steels have received more attention to substitute for the expensive austenitic stainless steels. The advantages of using duplex stainless steel are well proven and its cost efficiency is undisputable. For that reason many stainless steel manufacturers have tried to produce a variety of duplex grades and sizes; However, due to upward and downward bending on front end of slab during plate rolling, most manufacturers have problems to progress next rolling pass. In this study, we performed FEM analysis for calculating the amount of slab bending by changing rolling reduction and initial height of slab. And finally we proposed better rolling pass schedule for reducing the upward bending of slab.