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평면 음극선관의 재생률 향상을 위한 유리재료의 열적 특성에 관한 연구
박상후,이부윤,김원진,허보석,Park, Sang-Hu,Lee, Bu-Yun,Kim, Won-Jin,Heo, Bo-Seok 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.12
The CRT(Cathode-ray Tube) of salvage is a process of separating the panel and funnel to recycle a cathode-ray tube. In this paper, the thermal properties of glass for CRT were studied to improve its recycling ratio. In the salvage process, several patterns of breakage, as called 'comer pull', were easily generated on the sealing surface of panel or funnel glass due to the residual tensile stress, which had correlations with some parameters of the manufacturing process of CRT and the initial material properties of glass. Finite element analyses and experimental approaches on the flit sealing process were carried out to obtain the major characteristic of glass related to the residual stress. From this study, it was identified that the thermal expansion coefficient of glass had much influence on the residual stress of panel glass after frit sealing process. Therefore, the optimal conditions of thermal properties for CRT glass were proposed to achieve an effective salvage process. By using these optimal conditions, the size of comer pull on the panel and funnel glass was reduced to 10% level compared with the original size, and the recycling ratio of CRT was increased in the salvage process.
표면접촉 인쇄방식을 이용한 극미세 3차원 형상의 이식공정에 관한 연구
박상후(Sang-Hu Park),정준호(Jun-Ho Jeong),최대근(Dae-Geun Choi),김기돈(Ki-Don Kim),알리알툰(Ali Ozhan Altun),이응숙(Eung-Sug Lee),양동열(Dong-Yol Yang),공홍진(Hong-Jin Kong),이광섭(Kwang-Sup Lee) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.12
Precise fabrication of three-dimensional (3D) self-standing microstructures on thin glass plates via two-photon induced polymerization (TPP) has been an important issue for innovative 3D nanodevices and microdevices. However, there are still issues remaining to be solved, such as building 3D microstructures on opaque materials via TPP and being able to implant them as functional parts onto practical systems. To settle these issues simply and effectively, we propose a contact print lithography (CPL) method using an ultraviolet (UV)-curable polymer layer. We report some of the possibilities and potential of CPL by presenting our results for transplanting 3D microstructures onto large-area substrates and also our examination of some of the effects of the process parameters on successful transplantation.
나노 스테레오리소그래피 공정을 이용한 無마스크 나노 패턴제작에 관한 연구
박상후(Sang Hu Park),임태우(Tae Woo Lim),양동열(Dong-Yol Yang) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.3
Direct fabrication of nano patterns has been studied employing a nano-stereolithography (NSL) process. The needs of nano patterning techniques have been intensively increased for diverse applications for nano/micro-devices; micro-fluidic channels, micro-molds, and other novel micro-objects. For fabrication of high-aspect-ratio (HAR) patterns, a thick spin coating of SU-8 process is generally used in the conventional photolithography, however, additional processes such as pre- and post-baking processes and expansive precise photo masks are inevitably required. In this work, direct fabrication of HAR patterns with a high spatial resolution is tried employing two-photon polymerization in the NSL process. The precision and aspect ratio of patterns can be controlled using process parameters of laser power, exposure time, and numerical aperture of objective lens. It is also feasible to control the aspect ratio of patterns by truncation amounts of patterns, and a layer-by-layer piling up technique is attempted to achieve HAR patterns. Through the fabrication of several patterns using the NSL process, the possibility of effective patterning technique for various N/MEMS applications has been demonstrated.
스프링구동 메커니즘의 충격 하중을 받는 링크부재의 내피로 특성 향상
박상후(Sang-Hu Park),이부윤(Boo-Youn Lee),김원진(Won-Jin Kim),안길영(Kil-Young Ahn),오일성(II-Sung Oh) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.9
The air circuit breaker (ACB) with the spring-actuated mechanism was studied to improve the fatigue-proof<br/> characteristics of its link. The low-cycle fatigue fracture phenomenon occurred on the critical link, called h-link, of ACB from the repeated rapid closing and opening operations. To analyze the cause of failure, dynamic FE-analysis on the h-link part of ACB was performed considering the velocity and acceleration of the links per time as boundary conditions, which were obtained by using ADAMS. Also, the S-N curve obtained by experiments was used to investigate requirement on the fatigue-proof characteristics. Then, to reduce the maximum tensile stress on the h-link, three types of h-link were examined and one of them was selected.
긴 레이저 조사방식에 의한 저밀도 이광자 광중합 영역을 이용한 Sub-100 ㎚ 정밀도의 엠보싱 패턴제작
박상후(Sang Hu Park),임태우(Tae Woo Lim),양동열(Dong-Yol Yang) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.1
A long-exposing technique (LET) has been conducted to create nanoscale patterns applicable to diverse micro-devices using two-photon polymerization (TPP). By the weakly-polymerized region via the LET, double-layered embossing patterns can be fabricated simply in a single step. The LET makes possible a voxel and its surrounding to be fully grown into more than 500㎚ in lateral size and weakly-polymerized region (WPR), respectively. In the WPR, interconnecting ribs between voxels are generated, and they lead to the creation of double-layered dot patterns. Moreover, by controlling the distance between voxels, various shapes of interconnecting rib can be fabricated when the LET is applied. Various embossing patterns were fabricated to evaluate the usefulness of the proposed technique as a novel nanopatterning technique in TPP.
현상공정에서 표면장력에 의한 극미세 3 차원 구조물의 변형거동 분석 및 저감방안에 관한 연구
박상후(Sang-Hu Park),양동열(Dong-Yol Yang) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.4
Dense and fine polymer patterns often collapse, as they come into contact with each other at their protruding tips. Resist pattern collapse depends on the aspect ratio of patterns and the surface tension of rinsing materials. The pattern collapse is a very serious problem in microfabrication, because it is one of the factors which limit the device dimensions. The reasons for the pattern collapse are known as the surface tension of rinse liquid, centrifugal force and rinse liquid flow produced in the developing process. In this work, we tried to evaluate the pattern collapse of three-dimensional microstructures that were fabricated by two-photon induced photopolymerization, and showed the way how to reduce the deformation of microstructures.
저밀도 이광자 광중합 영역의 중첩방법을 이용한 기능성 마이크로 채널 제작에 관한 연구
박상후(Sang-Hu Park),임태우(Tae-Woo Lim),양동열(Dong-Yol Yang) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.12
Experimental studies on the fabrication of sub-30 ㎚ nanofibers using weakly two-photon induced photopolymerized region have been carried out. For the generation of nanofibers inside or outside microstructures, an over-polymerizing method involving a long exposure technique (LET) was proposed. Such nanofibers can find meaningful applications as bio-filters, mixers, and many other uses in diverse research field. A multitude of nanofibers with a notably high resolution (about 22 ㎚) in two-photon polymerization was achieved using the LET. Furthermore, it was demonstrated that the LET can be employed for the direct fabrication of various embossing patterns by controlling the exposure duration and the interval between voxels. Thin interconnecting networks are formed regularly in the boundary of the over-polymerized region, which allows for the creation of various pattern shapes. Overall of this work, some patterns including nanofibers are fabricated by the LET.
Kalman Filter 기반 차선 추정 강화에 대한 연구
박상후(Sang-Hu Park),이희승(Hee ?Seung Lee),송문형(Moon-Hyung Song),김창일(Chang-Il Kim),이광수(Gwang-Soo Lee),김문식(Moon-Sik Kim) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
As more and more step into the age of the automated driving vehicle, the importance of lane detection technology is being magnified. Vision sensor-based lane detection technology has been strengthed. However, lane detection technology was used for vertical control system for forward target vehicle selection without being used alone for side risk assessment or lateral control alone. Ego lane detected by the vision sensor can assume as an ego vehicle’s driving path and be useful for front target vehicle decision. Therefore, the importance of curvature and curvature-rate which have been relatively devaluated then lateral offset and heading angle is getting higher. In this study, a new approach of lane estimator for accurate curvature information by Kalman filter is proposed. The lane estimator is designed with road model and an assumption based on lane width. Real-car tests are underway for verifying the performance of proposed lane estimator. The test result shows that accuracy of the proposed lane estimator even in failure situation of front camera. Furthermore, the result also showed usefulness of lane estimation based target selection. Through the test result analysis, filtered only two coefficients which related clothoid curvature parameters could make lane information more accurately.