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Characterization of the Laser Scribing Process of HIT Cells for a Photovoltaic Shingled Module
Jee Hongsub,Lee Jaehyeong,Moon Daehan,Park Min-Joon,Jeong Taewung,Jeong Hyoungjin,Jeong Chaehwan 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
Shingled string technology can be used to maximize the output power of photovoltaic modules. The maximum power (Pmax) of a shingled photovoltaic module can be increased by using a bifacial heterojunction with an intrinsic thin layer (HIT) of cells. To fabricate the shingled strings for a high power module, we first cut 6-inch solar cells by laser scribing while minimizing cutting loss. Unlike standard crystalline silicon (c-Si) solar cells, the structure of bifacial HIT solar cells is weak under thermal effect, so an optimal scribing condition had to be found. After laser scribing processes had been optimized, Pmax was increased by 0.02W for each separated solar cells when we using an ultraviolet (UV) laser compared to the green laser, and a UV cut shingled string of HIT cell was demonstrated for the first time.
A Stochastic Analysis on Frontal Crash Tests
Taewung Kim,Hyungho Kim,Hyun-Yong Jeong,Wook Jin 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Crash test data usually have a comparatively large deviation because of the complexity of the tests. However, only limited numbers of crash tests are conducted to assess the safety performance of a vehicle due to monetary and time limitation. Thus, it is necessary to have consistent crash test results to assess the safety performance of a vehicle under development and to control factors which cause the variation in the test data. In this study, a MADYMO model was validated deterministically and stochastically to result in similar head, chest, pelvis deceleration pulses, belt load pulses, the mean and standard deviation values of HIC₁? and 3 msec clip to those from tests. By reducing the standard deviation of major factors which might cause the variation in the injury numbers, the reduced standard deviation of the injury numbers could be determined by conducting a stochastic analysis using the validated MADYMO model. The sensitivity of the standard deviation of the injury numbers to that of the major factors was calculated in order to find out the major factors which may cause the variation of the injury numbers the most. The sensitivity of the injury numbers implies that the variation in the air bag permeability and the critical load of the loadlimiter should be well controlled in order to reduce the variation in HIC15 and 3 msec clip, respectively.
A Simple Vehicle Model for Path Prediction during Aggressive Maneuvers
Taewung Kim,Kyukwon Bang,Hyun-Yong Jeong,Stephen Decker 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Active safety systems have been being developed in automotive industry, and an analytical vehicle model is needed in such systems to predict vehicle path to assess the crash probability. However, the bicycle model cannot result in a good correlation with test data and/or ADAMS simulation results, and other analytical vehicle models which use 8 or 14 degrees of freedom need more computation time. Therefore, in this study a simple analytical vehicle model was proposed to predict vehicle path especially during aggressive maneuvers. The analytical vehicle model can predict a vehicle's path based on the given vehicle speed and steering angle. In the analytical vehicle model, two different moment arms were used for inboard and outboard wheels, and lateral and longitudinal load transfers were taken into account. In addition, the magic formula tire model was used to estimate the lateral force. The analytical vehicle model has been validated with a sophisticated ADAMS model, and it resulted in a good correlation with test data.
투광형 실리콘 슁글드 태양광 모듈을 위한 타공형 스트링 제작
김한준(Han Jun Kim),박민준(Min-Joon Park),송진호(Jinho Song),정태웅(Taewung Jeong),문대한(Daehan Moon),정채환(Chaehwan Jeong) 한국태양광발전학회 2020 Current Photovoltaic Research Vol.8 No.4
Transparent photovoltaics (PV) are used in various applications such as building-integrated photovoltaics (BIPV). However, crystalline silicon (c-Si) is not used for developing transparent PV due to its opaque nature. Here. we fabficate the three holes in 6-inch c-Si solar cells using laser scribing process with an opening area ratio of about 6.8% for transparent c-Si solar modules. Moreover, we make the shingled strings using the perforated cells. Our 7 interconnected shingled string PV cells with 21 holes show a solar to power conversion of 5.721 W. In next work, we will fabricate a transparent c-Si PV module with perforated strings.