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조명각 변조 방식의 3차원 입체영상 표시장치설계 및 공차분석
정우철,하상우,박헌용,오범환,박세근,이일항,이승걸,박순룡,조성민,Jeong, Woo-Chul,Ha, Sang-Woo,Park, Hun-Yang,O, Beom-Hwan,Park, Se-Geun,Lee, El-Hang,Lee, Seung-Gol,Park, Sun-Ryoung,Jo, Sung-Min 한국광학회 2005 한국광학회지 Vol.16 No.3
In order to realize a 3-D stereoscopic display module with alternating illumination angles, several conditions required for a lenticular lens sheet were established, and then both the lens specification and the module structure were designed. Also the performance of the stereoscopic module and its tolerance characteristics were evaluated by simulating the intensity distribution on the observation plane with a finite-ray tracing technique. From the evaluation, it was known that an intersection area between two adjacent lenses should not be filled and that the lateral mismatch between a planar liquid crystal shutter and a lens sheet should be minimized. 조명각 변조 방식에 의한 3차원 입체영상 표시장치의 구현을 위해 렌티큘라 렌즈가 만족해야할 조건을 확립한 후 근축광선이론으로 렌즈 규격 및 모듈 구조를 설계하였고, 유한광선 추적법(finite ray tracing)을 이용하여 스테레오스코픽 모듈의 규격변화, 조립과정의 정렬오차, 그리고 관찰자의 관찰 조건에 따른 영향을 분석하였다. 이를 통해 신호잡음을 최소화하기 위해 제작 공정에서 렌즈 함몰부가 발생하지 않아야 하며, 평판형 액정 셔터와 렌티큘라 렌즈 판 사이의 어긋남이 최소화되어야 함을 알 수 있었다.
인서트 코어 타입 Cap 성형용 대용량 금형 제작에 관한 연구
정우철,허영무,신광호,윤길상,이정원,Jung, Woo-Chul,Heo, Young-Moo,Shin, Gwang-Ho,Yoon, Gil-Sang,Lee, Jeong-Won 한국금형공학회 2008 한국금형공학회지 Vol.2 No.3
In recent, the demands of household cases and disposable products is increased significantly because a living standard of newly-emerging nations was risen. Therefore, multi-cavity mold and stack mold for the realization of high-productivity have been researched in forefront nations. In this paper, CAE analysis for minimizing the mold core deformation was performed. Finally, 64 cavities injection mold for molding cap which has the insert-type core was fabricated according to the result of CAE analysis.
3T MREIT 시스템을 이용한 실험견 사체의 두부 도전율 영상
정우철,김영태,김형중,이태휘,강병택,박희명,우응제,Jeong, Woo-Chul,Kim, Young-Tae,Minhas, Atul S.,Kim, Hyung-Joong,Lee, Tae-Hwi,Kang, Byeong-Teck,Park, Hee-Myung,Woo, Eung-Je 대한의용생체공학회 2009 의공학회지 Vol.30 No.2
Magnetic Resonance Electrical Impedance Tomography (MREIT) is a new bio-imaging modality providing cross-sectional conductivity images from measurements of internal magnetic flux densities produced by externally injected currents. Recent MREIT studies demonstrated successful conductivity image reconstructions of postmortem and in vivo canine brain. However, the whole head imaging was not achieved due to technical issues related with electrodes and noise in measured magnetic flux density data. In this study, we used a new carbon-hydrogel electrode with a large contact area and injected 30 mA imaging current through a canine head. Using a 3T MREIT system, we performed a postmortem canine experiment and produced high-resolution conductivity images of the entire canine head. Collecting magnetic flux density data inside the head subject to multiple injection currents, we reconstructed cross-sectional conductivity images using the harmonic $B_z$ algorithm. The conductivity images of the canine head show a good contrast not only inside the brain region including white and gray matter but also outside the brain region including the skull, temporalis muscle, mandible, lingualis proprius muscle, and masseter muscle.
정우철,남태철 ( W . C . Jeong,T . C . Nam ) 한국센서학회 1998 센서학회지 Vol.7 No.4
The principle, design, and application of a gear-tooth sensor for the rough environmental conditions such as high temperatures of up to 150℃ are studied. The rotation of a tooth wheel is detected by a couple of Hall elements manufactured on the SIMOX wafer by a methode of differential detection using bipolar silicon technology. The product sensitivity of the Hall element is about 510 V/AT over a wide temperature range of -40℃ ∼ 150 ℃. The differential Hall sensor makes the maximum possible distance between sensor and tooth wheel wider than that when single Hall element is used over a wide temperature range, and the maximum detectable distance is 4.5mm at driving current of 4mA.