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온도변화에 따른 자동차 전륜구동축재의 피로크랙전파거동에 관한 연구
이상열(S.R.Lee),정재강(J.K.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study, the rotary bending fatigue test was carried out with two kinds of material, S43C and S50C, using in the Front engine and Front drive wheels(F.F.) of vehicle. The one part of specimens was heated by high frequency induction method(about 1mm depth and H_RC 56~60) and tested environment temperature were -30℃, +25℃ and +80℃ in order to look over the influence of the heat treatment and the temperatures.<br/> In the experimented result at +25℃ and +80℃, the fatigue life of non-heated specimens were decreased about 35%, but that of heated specimens were decreased about only 5% at +80℃ more than at 25℃. And in the experiment result at -30℃ and +25℃, the non-heated and heated specimens were about 110%, 120% higher fatigue life at -30℃ than at the +25℃ each other. On the other hand, the fatigue crack propagation rate of S50C was higher than that of S43C.
이상열,홍광준,유상하,신용진,이관교,서상석,김혜숙,윤은희,김승욱,박향숙,신영진,정태수,신현길,김택성,문종대,이충일,전승룡 ( S . Y . Lee,K . J . Hong,S . G . You,Y . j . Shin,K . K . See,S . S . Suh,H . S . Kim,E . H . Yun,S . U . Kim,H . S . Park,Y . 센서 한국센서학회 1995 센서학회지 Vol.4 No.3
Polycrystalline Cd_(1-x)Zn_xS thin film were grown on slide glass(corning-2948) substrate using a chemical bath deposition (C.B.D) method. They were annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometor in order to study Cd_(1-x)Zn_xS polycrystal structure using extrapolation method of X-ray diffraction patterns for the CdS, ZnS sample annealed in N₂ gas at 550 ℃. It was found hexagonal structure which had the lattice constant a_o = 4.1364Å, c_o=6.7129Å in CdS and a_o = 3.8062Å, c_o = 6.2681 Å in ZnS, respectively. Hall effect on these sample was measured by Van der Pauw method and then studied on carrier density and mobility depending on temperature. We measured also spectral response, sensitivity maximum allowable power dissipation and response time on these sample
$Cd_{1-x}Zn_{x}S$ 박막의 성장과 광전도 특성
이상열,홍광준,유상하,신용진,이관교,서상석,김혜숙,윤은희,김승욱,박향숙,신영진,정태수,신현길,김태성,문종대,이충일,전승룡,Lee, S.Y.,Hong, K.J.,You, S.H.,Shin, Y.J.,Lee, K.K.,Suh, S.S.,Kim, H.S.,Yun, E.H.,Kim, S.U.,Park, H.S.,Shin, Y.J.,Jeong, T.S.,Shin, 한국센서학회 1995 센서학회지 Vol.4 No.3
Chemical bath deposition(C.B.D.)방법으로 다결정 $Cd_{1-x}Zn_{x}S$ 박막을 스라이드 유리(coming-2948) 기판위에 성장시켜 열처리하고 X-선 회절무늬를 측정하여 결정구조를 밝혔다. $550^{\circ}C$로 $N_{2}$ 속에서 열처리한 시료의 X-선 회절무늬로부터 외삽법으로 구한 격자상수는 CdS인 경우 $a_{0}\;=\;4.1364{\AA}$, $c_{0}\;=\;6.7129{\AA}$였으며 ZnS인 경우는 $a_{0}\;=\;3.8062{\AA}$, $c_{0}\;=\;6.2681{\AA}$였다. Van der Pauw 방법으로 Hall 효과를 측정하여 운반자 농도와 이동도의 온도 의존성을 연구하였다. 광전도 셀의 특성으로 스펙트럼응답 감도, 최대허용소비전력 및 응답시간을 측정하였다. Polycrystalline $Cd_{1-x}Zn_{x}S$ thin film were grown on slide glass(corning-2948) substrate using a chemical bath deposition (C.B.D) method. They were annealed at various temperature and X -ray diffraction patterns were measured by X-ray diffractometor in order to study $Cd_{1-x}Zn_{x}S$ polycrystal structure using extrapolation method of X-ray diffraction patterns for the CdS, ZnS sample annealed in $N_{2}$ gas at $550^{\circ}C$. It was found hexagonal structure which had the lattice constant $a_{0}\;=\;4.1364{\AA}$, $c_{0}\;=\;6.7129{\AA}$ in CdS and $a_{0}\;=\;3.8062{\AA}$, $c_{0}\;=\;6.2681{\AA}$ in ZnS, respectively. Hall effect on these sample was measured by Van der Pauw method and then studied on carrier density and mobility depending on temperature. We measured also spectral response, sensitivity maximum allowable power dissipation and response time on these sample.
홍광준,이상열,유상하,서상석,문종대,신영진,정태수,신현길,김택성,송정훈,유기수 ( K . J . Hong,S . Y . Lee,S . H . You,S . S . Suh,J . D . Moon,Y . J . Shin,T . S . Jeoung,H . K . Shin,T . S . Kim,J . H . Song,K . S . Rheu ) 한국센서학회 1993 센서학회지 Vol.2 No.1
Polycrystalline CdS thin films were grown on ceramic substrate using a chemical bath deposition method. They were annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometer in order to study CdS polycrystal structure. Using extrapolation method of X-ray diffraction patterns for the CdS samples annealed in N₂ gas at 5500 it was found hexagonal structure whose lattice constants a_o and c_o were 4.1364 Å and 6.7129 Å, respectively. Its grain size was about 0.35 ㎛. Hall effect on this sample was measured by Van der Pauw method and studied on carrier density and mobility depending on temperature. From Hall data, the mobility was likely to be decreased by piezo electric scattering at temperature range of 33K and 150K and by polar optical scattering at temperature range of 150K and 293K. We measured also spectral response, sensitivity (γ), maximum allowable power dissipation and response time on these samples.
HWE 방법에 의한 CdSe 박막 성장과 광전기적 특성
홍광준,이관교,이상열,유상하,신용진,서상석,정준우,정경아,신영진,정태수,김택성,문종대,김혜숙 ( K . J . Hong,K . K . Lee,S . Y . Lee,S . H . You,Y . J . Shin,S . S . Suh,J . W . Jeong,K . A . Jeong,Y . J . Shin,T . S . Jeong,T . S . Kim,J . D 한국센서학회 1997 센서학회지 Vol.6 No.4
The CdSe thin films were grown on the Si(100) wafers by a hot wall epitaxy method (HWE). The source and substrate temperature are 600? and 430 respectively. The crystalline structure of epilayers was investigated by double crystal X-ray diffraction(DCXD). Hall effect on the sample was measured by the van der Pauw method and studied on the carrier density and mobility dependence on temperature. From Hall data, the mobility was increased in the temperature range 30K to 150K by impurity scattering and decreased in the temperature range 150K to 293K by the lattice scattering. In order to explore the applicability as a photoconductive cell, we measured the sensitivity(γ), the ratio of photocurrent to darkcurrent(pc/dc), maximum allowable power dissipation(MAPD), spectral response and response time. The results indicated that the photoconductive characteristic were the best for the samples annealed in Cu vapor compare with in Cd, Se, air and vacuum vapour. Then we obtained the sensitivity of 0.99, the value of pc/dc of 1.39 X 10^7, the MAPD of 335mW, and the rise and decay time of l0ms and 9.5ms, respectively
농업부산물 바이오매스의 온도별 질량감소에 따른 반탄화(torrefaction) 수율 예측 및 특성분석
주영민 ( Ju Y. M. ),조라훈 ( L. H. Cho ),이서현 ( S. H. Lee ),박선용 ( S. Y. Park ),정인선 ( I. S. Jeong ),이상열 ( S. Y. Lee ),이충건 ( C. G. Lee ),주상연 ( S. Y. Joo ),김대현 ( D. H. Kim ),오광철 ( K. C. Oh ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2017 강원 농업생명환경연구 Vol.29 No.1
Recently, global warming and environmental pollution are accelerating because of the continuous use of fossil fuels. Energy sources from biomass are considered one of the possible solutions to overcome this problem. In this study, application of agricultural by-products as new bioenergy resources through torrefaction was investigated. Pepper stems were selected from among domestic agricultural by-products to perform this energy conversion process. The sample was crushed and separated (standard testing sieve) into particles of 2.36 mm or less. The selected materials were injected into a prototype capsule, and the experiment was repeated three times for 10 min at a reaction temperature of 200°C, 230°C, or 270°C for up to 40 min. Mass reduction was measured after 1 h of cooling to minimize rapid reaction with oxygen in the atmosphere. Frequency factor coefficients and activation energy of lignocellulosic biomass were investigated for simulation analysis. The reaction rate constants were derived from the experimental results, and mass reduction was predicted with respect to different temperatures through a simulation. The experimental results were in good agreement with the simulation values 0.95 of the correlation and 0.46 of the RMSE. It will be necessary to develop a model that includes dry moisture, particle size, and reactor shape, because these factors may have a significant influence on the torrefaction process.
CBD 방법에 의한 CdS1-xSex 박막의 열처리에 따른 광전기적 특성
문종대,정태수,신현길,김택성,신영진 ( Y . J . Shin ),홍광준 ( K . J . Hong ),유상하 ( S . H . You ),서상석 ( S . S . Suh ),최승평 ( S . P . Choi ),이상열 ( S. Y . Lee ),신용진 ( Y . J . Shin ),이관교 ( K . K . Lee ),김혜숙 ( H . S . Kim ),윤 한국센서학회 1995 센서학회지 Vol.4 No.1
Polycrystalline CdS_(1-x)Se_x, thin films were grown on ceramic substrate using a chemical bath deposition method. They ere annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometer in order to study CdS_(1-x)Se_x, polycrystal structure using extrapolation method of X-ray diffraction patterns for the CdS. CdSe samples annealed in gas at a 0 it was found hexagonal structure which had the lattice constant a_0=-4.1364Å, c_0=6.7129Å in CdS and a_0=4.3021Å, c_0=7.3021Å in CdSe. respectively. Hall effect on these samples was measured by Van der Pauw method and then studied on carrier density and mobility depending on temperature. We measured also spectral response, sensitivity(γ), maximum allowable power dissipation and response time on these samples.