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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.
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.
정우철,이정태,강석중,최병대,Jeong, U-Cheol,Lee, Jeong-Tae,Palmos, Grace N,Kang, Seok-Joong,Choi, Byeong-Dae 한국생명과학회 2007 생명과학회지 Vol.17 No.9
Effects of muscle fluid concentrates from Styela clava on fish diets were investigated in rainbow trout(Oncorhynchus mykiss). Fish were fed on one of the isonitrogenous(48%) and isolipic(20%) feed containing 5 to 20% of muscle fluid concentrates for 8 weeks. Hematological parameters such as hemoglobin, hematocrit, albumin, glucose, total bililubin, triglyceride and glutamic pyruvate transaminase of the rainbow trout which were fed on the diets varied, but no specific trend became apparent. However, glutamic oxaloacetic transaminase value was significantly higher than that of normal fishes. Therefore, concentrated ascidian fluid which is normally discarded, can be combined with commercial diets for the normal growth of rainbow trout.
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.