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Al5052와 Al7075의 미세프리즘패턴 가공특성 비교
박언석(E. S. Park),최환진(H. J. Choi),전은채(E. c. Jeon),최두선(D. S. Choi),제태진(T. J. Je) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Recently display industries have been dramatically growing with ubiquitous society; therefore, demands of optical components which have micro-pattern have been increased. Molds of optical components having micro-pattern generally are machined using ultra precision machine tool by diamond tool on nonferrous metal in order to get fine surface roughness. In particular, Al alloys of nonferrous metals have a lot of advantages such as light weight, affordable price, getting plates of large surface-area. Machining characteristics of Al 5052 and 7075 were compared according to one and multi pass in this study when machining V100° micro-prism pattern.
2 차원 평판가공법을 이용한 고세장비 미세 격벽어레이구조물 가공
박언석(Eun-Suk Park),최환진(Hwan-Jin Choi),김한희(Han-Hee Kim),전은채(Eun-chae Jeon),제태진(Tae-Jin Je) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.12
The micro barrier rip array structures have been applied in a variety of areas including as privacy films, micro heat sinks, touch panel and optical waveguide. The increased aspect ratio (AR) of barrier rip array structures is required in order to increase the efficiency and performance of these products. There are several problems such as burr, defect of surface roughness and deformation and breakage of barrier rip structure with machining high-aspect ratio micro barrier rip array structure using orthogonal cutting method. It is essential to develop technological methods to solve these problems. The optimum machining conditions for machining micro barrier rip array structures having high-aspect ratio were determined according to lengths (200 μm and 600 μm) and shape angles (2.89° and 0°) of diamond tool, overlapped cutting depths (5 μm and 10 μm), feed rates (100 mm/s) and three machining processes. Based on the optimum machining conditions, micro barrier rib array structures having aspect ratio 30 was machined in this study.
플레이너를 이용한 고 세장비 마이크로 사각채널가공에서 공정방법이 구조물 변형에 미치는 영향분석
박언석(E. S. PARK),최두선(D. S. CHOI),장성환(S. H. JANG),이응숙(E. S. LEE),제태진(T. J. JE) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently, machining technology of micro channel structure is applied to display, energy, optical communication and LED in the industry field. These products are required miniature of micro channels and high aspect ratio in order to increase performance and efficient but aspect ratio is so increased and thin that deformation of micro structures cause. This paper present that deformation of high aspect ratio micro structure is prevented by using three machining methods.
음성인식을 위한 Speech의 Segmentation과 신경망 모델의 응용
박언석,김태식,정성엽 계명대학교 산업기술연구소 1992 産業技術硏究所 論文報告集 Vol.15 No.2
A new approach for utilizing artificial neural networks for identification of speakers and words is presented throughout this paper. A multilayer perceptron architecture with three layers is designed. Each indivisual has own voice characteristics that will be extracted by the proposed methods. The extracted features are used for training with backpropagation algorithm. The network is trained by 60 voice files which are collected from three different indivisuals. The identification rates are about 85% ∼100%