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박형 결정질 실리콘 태양전지에서의 휨현상 감소를 위한 알루미늄층 두께 조절
백태현,홍지화,임기조,강기환,강민구,송희은,Baek, Tae-Hyeon,Hong, Ji-Hwa,Lim, Kee-Joe,Kang, Gi-Hwan,Kang, Min-Gu,Song, Hee-Eun 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
Crystalline silicon solar cell remains the major player in the photovoltaic marketplace with 80% of the market, despite the development of various thin film technologies. Silicon's excellent efficiency, stability, material abundance and low toxicity have helped to maintain its position of dominance. However, the cost of silicon materials remains a major barrier to reducing the cost of silicon photovoltaics. Using the crystalline silicon wafer with thinner thickness is the promising way for cost and material reduction in the solar cell production. However, the thinner the silicon wafer is, the worse bow phenomenon is induced. The bow phenomenon is observed when two or more layers of materials with different temperature expansion coefficiencies are in contact, in this case silicon and aluminum. In this paper, the solar cells were fabricated with different thicknesses of Al layer in order to reduce the bow phenomenon. With less amount of paste applications, we observed that the bow could be reduced by up to 40% of the largest value with 120 micron thickness of the wafer even though the conversion efficiency decrease by 0.5% occurred. Since the bowed wafers lead to unacceptable yield losses during the module construction, the reduction of bow is indispensable on thin crystalline silicon solar cell. In this work, we have studied on the counterbalance between the bow and conversion efficiency and also suggest the formation of enough back surface field (BSF) with thinner Al layer application.
정수압을 받는 축대칭 절두체 원추형 압력용기의 응력해석
백태현,정태진,Baek, Tae-Hyun,Chung, Tae-Jin 한국정밀공학회 1992 한국정밀공학회지 Vol. No.
Theoretical equations for hoop stress, longitudinal or meridian stress and Von Mises stress of an axismmetric conical pressure vessel and a frustum of conical pressure velle, both of which are pressuized by hydrostatic loading, are derived from equilibrium equations. The membrane stresses conputed by theoretical equations for a conical pressure vessel and a frustum of conical pressure vessel are compared with the values obtained from finite elelment method. Based on the fact that the computational values by theoretical equations are well agreed with the finite element results, derived equations are proved to be valid and it is possible for those equations to be conveniently used for structural analysis or design of frustum of conical pressure vessel which is a part of silo body.
강봉의 냉간 인발시 발생하는 잔류응력 성분에 관한 유한요소 해석
백태현,최희진 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Prediction the behaviour of steel during a deformation process under service conditions is one of the main challenges in cold forming, The design of optimized forging schedules, by means of conventional trial and error methods, has become increasingly heavy in terms of time and cost in a competitive environment. During the last few years, numerical simulations have become a very efficient tool to arrive these goals. In this paper, finite element analysis was used to analyze the distribution of residual stress components in a rod with respect die angle and/or area reduction in cold drawing process. Cold drawing brought sunken-in deformation at the bottom land of the rod that was in accord with the result obtained from the analysis using ABAQUS. The results obtained from finite element analysis were in close agreement with the determined high-accuracy measurements.
Application of ESPI to Measurement of Out-of-planeDisplacement in a Spot Welded Canti-levered Plate
백태현,EuiGyunNa,SeungKeeKoh,MyungSooKim 한국정밀공학회 2003 International Journal of Precision Engineering and Vol.4 No.5
Electronic Speckle Pattern Interferometry (ESPI) has been recently developed and widely used because it has the advantage of being able to measure surface deformations of engineering components and materials in industrial areas without contact. The speckle patterns formed with interference and scattering phenomena can measure not only the out-of-plane but also the in-plane deformations. Digital image equipment processes the information included in the speckle patterns and displays the consequent interferogram on a computer monitor. In this study, the experimental results of a canti-levered plate using ESPI were compared with those obtained from the simple beam theory. The ESPI results of the canti-levered plate, analyzed by 4-step phase shifting method, are close to the theoretical expectation. Similarly, out-of-plane displacements of a spot welded canti-levered plate were also measured by ESPI with 4-step phase shifting technique. The phase map of the spot welded canti-levered plate is quite different from that of the canti-levered plate without spot welding.
압축하중을 받는 원형디스크의 등경 및 등색프린지의 이론 및 실험적 분포
백태현,김환 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
Photoelastic fringes of a circular disk under diametrical compression are simulated to calculate the phase maps of isoclinics and isochroamtics. Theoretical distributions of isoclinics and isochrmatics along a specified lines are calculated. Also, experimental fringes of a stress-frozen disk were measured by 8-step fringe shift method. The magnitudes of isoclinics and isochromatics obtained from fringe phase shift method with 8-step are compared with those calculated by theory and manual measurements. Close agreement among the results can be observed.
가토 적혈구함유 한천평판과 Capillary Dropper를 이용한 ASLO 價 측정에 관한 연구
백태현 충남대학교 의과대학 지역사회의학연구소 1977 충남의대잡지 Vol.4 No.2
Macrotechnic of Rantz-Randall has been used commonly for determination of the titer of ASLO. But not available for mass surveys and for use with children because of requiring relatively a large quantity of test serum and high cost reagents. For these reasons, Author employed gel diffusion technic using 2.5% rabbit RBC agar gel and microtechnic using capillary dropper with direct comparison with macro technic. The results are summarized as follows: 1. Gel diffusion technic couldn't save reagents. 2. Microtechnic require a small quantity of test serum (0.02ml) and 1/10 reagents of the macrotechnic. 3. Of the 52 comparative macro and gel diffusion samples, 33(63.5%) showed identical titers by both technics, while 18(34.6%) differed by 1 tube and 1(1.9%) by 2 tube. The limit of error for ASLO ditermination is ±1 tube. 4. Of the 80 comparative macro and micro samples, 63(78.8%) showed identical titers by both technics, while 16(20.0%) differed by 1 tube and 1(1.2%) by 2 tube. The limit of error for determination is ±1 tube.
등각사상 맵핑 및 광탄성 실험법에 의한 원형구명 주위의 하이브리드 응력장 해석
백태현,김명수,이주훈,Baek, Tae-Hyun,Kim, Myung-Soo,Rhee, Ju-Hun 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
An experimental study is presented for the effect of number of terms of a pewee series type stress function on stress analysis around a hole in tensile loaded plate. The hybrid method coupling photoelastsic data inputs and complex variable formulations involving conformal mappings and analytical continuity is used to calculate tangential stress on the boundary of the hole in uniaxially loaded, finite width tensile plate. In order to measure isochromatic data accurately, actual photoelastic fringe patterns are two times multiplied and sharpened by digital image processing. For qualitative comparison, actual fringes are compared with calculated ones. For quantitative comparison, percentage errors and standard deviations with respect to percentage errors are caculated for all measured points by changing the number of terms of stress function. The experimental results indicate that stress concentration factors analyzed by the hybrid method are accurate within three percent compared with ones obtained by theoretical and finite element analysis.
광탄성 프린지 위상 이동법을 이용한 곡선보평판의 응력 해석
백태현,김명수,김수일,Baek, Tae-Hyeon,Kim, Myeong-Su,Kim, Su-Il 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.9
The method of photoelasticity allows one to obtain principal stress differences and principal stress directions in a photoelastic model. In the classical approach, the photoelastic parameters are measured manually point by point. This is time consuming and requires skill in the identification and measurement of photoelastic data. Fringe phase shifting method has been recently developed and widely used to measure and analyze fringe data in photo-mechanics. This paper presents the test results of photoelastic fringe phase shifting method for the stress analysis of a curved beam plate. The technique used here requires four phase stepped photoelastic images obtained from a circular polariscope by rotating the analyzer at 0˚, 45˚, 90˚ and 135˚. Experimental results are compared with those of ANSYS and calculated by the simple beam theory. Good agreement among the results can be observed.