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동종 연골을 이용한 가토 측두하악관절원판 재건시 냉동 보존제의 영향에 관한 실험적 연구
김원규,김수남,민승기,성길현,권혁도,Kim, Won-Gyu,Kim, Soo-Nam,Min, Seung-Ki,Sung, Gil-Hyun,Keon, Heak-Do 대한악안면성형재건외과학회 1993 Maxillofacial Plastic Reconstructive Surgery Vol.15 No.4
The auricular cartilage grafts have been widely used in replacement of the temporomandibular joint disk. Cartilage grafts itself have a low metabolism and high survival rate after grafting. In processing the grafting materials, it was important to preserve the properties of chondrocyte proper. We used 15% glycerol and 10% DMSO (Dimethyl Sulfoxide) solutions for cartilage fixation before deep freezing. We have performed the allogenic auricular cartilage graft in the temporomandibular joint of 20 rabbits which 10 specimen was treated with 15% glycerol and the other 10 specimen was treated with 10% DMSO respectively and examined in 1, 2, 4, 6 and 8 weeks after operation histopathologically. The result were : 1. Inflammatory cell infiltration around the grafted material appeared more glycerol groups than DMSO groups at 1 week, but each group has no differences after 2 weeks. 2. Degenerative changes of grafted auricular chondrocytes were more deveolped in glycerol group than DMSO groups till 4 weeks, but there were no differences between two groups after 6 weeks. 3. Fibrous union between grafted fragment and mandibular condyle was prominent in DMSO group. 4. Vascular proliferation of the grafted auricualr cartilage was more developed in DMSO groups than glycerol group in early stage. 5. Amount of the additional growth of grafted auricular cartilage was more existed in DMSO groups than glycerol group. 6. General survival rate after grafting was more prominent in DMSO group. In summary, allogenic auricular cartilage grafts treated with 15% glycerol and 10% DMSO solution have supported to survivalbility as a cryopreservative agents, especially DMSO groups have little inflammatory cell infiltration in early stages and degenerative changes and additional growth are more prominent than glycerol groups.
GIS 예방진단시스템 주파수 분석장치 성능개선 및 검증
김원규(Won-Gyu Kim),김민수(Min-Soo Kim),백영식(Young-Sik Baek) 대한전기학회 2015 전기학회논문지 Vol.64 No.3
This paper shows the design improvement and test model of FAU (Frequency Analysis Unit) in PDD (Partial Discharge Diagnosis system) for 800kV GIS (Gas Insulated Switchgear). We found some problems during operation of previous FAU, such as the aging of fiber-optic converter that can cause communication error, the malfunction of signal analysis circuit etc. And then we solved those problems by design improvement and verified the performance through type test. To monitor partial discharge, the performance of UHF sensor is important but the performance of frequency analysis unit is also very important. So we solved communication error, the malfunction of signal analysis circuit and then increased the operation reliability of FAU by improving fiber-optic converter and signal analysis circuit. Accredited testing laboratory carried out the performance verification test according to performance test criteria and procedure of reliability test standards, IEC-60225, 61000 and 60068 etc. We confirmed the test results which correspond with the performance test criteria.
김원규(Won-Gyu Kim),권오진(Oh-Jin Kwon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
We propose a new method to hide data in binary image. Instead of hiding data in traditional spatial domain, we hide them in the Binary Wavelet Transform(BWT) domain. And flippable pixels can be found more easily and efficiently by investigating high frequency components of BWT coefficients