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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.
박판 Insert 사출성형시 Insert 변형 특성에 관한 기초 연구
정우철,신광호,허영무,윤길상,이정원,Jung, Woo-Chul,Shin, Gwang-Ho,Heo, Young-Moo,Yoon, Gil-Sang,Lee, Jeong-Won 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
Recently, ultra precision and light-weight micro products are needed in various industries. Injection molding products with metal insert material is often satisfied with light-weight and precision simultaneously. The researches on macro-size insert deformation have been performed but, a research on micro-size insert is meager. In this paper, the injection molding product with $300{\mu}m$ thin foil insert is designed and insert injection molding process is performed. Finally, the deformation of thin foil insert is analyzed according to insert feature and gate length.
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.
3차 의료기관에서 Helicobacter pylori 제균의 성적 질환과 투여된 약제, 투여 기간에 따른 제균의 성적과 제균 후 재감염에 대한 조사
정우철 ( Woo Chul Chung ),조영석 ( Young Seok Cho ),정정조 ( Joeng Jo Jeong ),이인석 ( In Seok Lee ),김상우 ( Sang Woo Kim ),양진모 ( Jin Mo Yang ),최명규 ( Myung Gyu Choi ),정인식 ( In Sik Chung ),박두호 ( Doo Ho Park ) 대한소화기학회 2003 대한소화기학회지 Vol.41 No.1
Background/Aims: Controversies regarding the indications and regimens for the eradication of Helicobacter pylori (H. pylori) still exist. Failure rates have been reported to range from 5% to 10%. This study aimed to evaluate the efforts for the eradication of H. pylori of a tertiary clinic. We assessed the eradication rates according to the diseases, therapeutic regimens, and duration of therapy. In addition, we examined the effectiveness of secondary regimens in patients who failed to respond to primary regimens and the reinfection rate after a successful eradication. Methods: We investigated 389 patients with documented H. pylori infection between January 1996 and December 2001. Results: The overall eradication rate was 79.2%. There were no significant differences in the eradication rates according to the diseases and therapeutic regimens. However, there was a significant difference according to the duration of therapy. Proton pump inhibitor-based 10-day and 14-day regimens were superior to 7-day regimens. The eradication rate of secondary regimens in patients who failed to respond to primary regimens was 76.9%. The reinfection rate after a successful eradication was 4.4%. Conclusions: These results suggest that proton pump inhibitor-based triple regimens with 10 or 14 days of duration should be considered as primary H. pylori eradication therapy. (Korean J Gastroenterol 2003;41:1-8)