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오늘 본 자료
송준용(Song, JunYong),정대영(Jeong, Daeyoung),김찬석(Kim, Chan Seok),박상현(Park, Sang Hyun),조준식(Cho, Jun-Sik),윤경훈(Yun, Kyounghun),송진수(Song, Jinsoo),이정철(Lee, JeongChul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
This paper investigates the dependence of a-Si:H/c-Si passivation and heterojunction solar cell performances on various cleaning processes of silicon wafer and surface morphology. It is observed that passivation quality of a-Si:H thin-films on c-Si wafer highly depends on wafer surface conditions. The MCLT(Minority carrier life time) of wafer incorporating intrinsic (i) a-Si:H as a passivation layer shows sensitive variation with cleaning process and surface morpholgy. By applying improved cleaning processes and surface morphology we can obtain the MCLT of 200{mu}sec after H-termination and above 1.5msec after i a-Si:H thin film deposition, which has implied open circuit voltage of 0.720V.
댐퍼 스프링의 동적 히스테리시스 저감이 터빈 진동 개선에 미치는 영향에 관한 연구
송준용(Junyong Song),이진수(Jinsoo Lee),홍순석(Soonseok Hong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this thesis, we explain developing processes for torsional damper of torque converter to improve turbine oscillation at passenger car. Turbine oscillation is one of the major NVH issues of the vehicle because it is directly connected to the durability and ride comfort. So, we propose a way to solve this problem by reducing the hysteresis torque of damper spring. And also, predicts vibration transmissibility of the improved design using simulation analysis.
Surface passivation study of a-Si:H/c-Si heterojunction solar cells using VHF-CVD
송준용(Song, JunYong),정대영(Jeong, Daeyoung),김경민(Kim, Kyoung Min),박주형(Park, Joo Hyung),송진수(Song, Jinsoo),김동환(Kim, Donghwan),이정철(Lee, JeongChul) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
In amorphous silicon and crystalline silicon(a-Si:H/c-Si) heterojuction solar cells, intrinsic hydrogenated amorphous silicon(a-Si:H) films play an important role to passivate the crystalline silicon wafer surfaces. We have studied the correlation between the surface passivation quality and nature of the Si-H bonding at the a-Si:H/c-Si interface. The samples were obtained by VHF-CVD under different deposition conditions. The passivation quality and analysis of all structures studied was performed by means of quasi steady state photoconductance(QSSPC) methods and fourier transform infrared spectrometer(FTIR) measurements respectively.
송준용(Junyong Song),홍순석(Soonseok Hong) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Hydrodynamic retarder is one of the important auxiliary braking systems among heavy vehicle. The braking torque depends on the oil filling and the number of revolution of the brake rotor. Using the retarder, there are advantages that can significantly reduce the wear of the brake pads and tires. However, it transmits undesired power which can lead to an undesired power loss in the drive train in non-braking mode. In order to reduce energy losses and thus reduce the vehicle’s fuel consumption, we explain developing processes of the retarder with clutch devices. It is disengaged from the gearbox or the propeller shaft when the retarder is deactivated and does not have to brake the vehicle. And we also predict the fuel consumption of the heavy vehicle according to the mounting retarder clutch using Simulation analysis.
지게차 주행성능과 토크컨버터 유체성능 매칭에 관한 연구
송준용(Junyong Song),권기현(Kihyun Kwon),홍순석(Soonseok Hong) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4
In this thesis, we explain developing processes for hydrodynamic performance of torque converter to achieve the objective of forklift driving performance. Forklift is one of the dangerous machines which causes the fatal accidents most frequently. For safety, the creep speed of the forklift needs to be lowered. So, we predict the driving performance of the forklift according to the torque converter performance using Simulation analysis. Finally, we present the torque converter performance patterns to achieve the target performance.