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한태경(Hahn Tae-Kyung),김진호(Kim Jin-Ho),전영환(Chun Young-Hwan),홍준희(Hong Jun-Hee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
전력수급에 있어서 공급측 자원을 대체하는 자원으로써 수요측 자원을 주목하는 가운데 그 활용분야로 수요측 자원을 예비력자원으로의 활용이 것이 연구되고 있다. 본 논문에서는 캘리포니아의 최대부하관리를 위한 에어컨 순환운전 프로그램을 수정하여 예비력자원으로 사용하려는 시도에 대해서 소개한다. 시연결과 부하측 자원은 반응속도와 신뢰성에 있어서 장점이 있지만 실제로 활용되기 위해서는 제도적인 뒷받침과 실제 운영 경험이 필요하다.
윈도우즈 기반의 저주파수 계전기 작동 모의 프로그램의 개발
한태경(Hahn Tae-Kyung),김진호(Kim Jin-Ho),전영환(Chun Young-Hwan),양정재(Yang Jung-Jae),박종근(Park Jong-Keun) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
국내 계통의 부하가 꾸준히 증가하면서 기존의 저주파수계전기의 운용방식으로는 계통사고시에 효과적인 계통보호를 위한 적절한 양의 부하차단이 이루어지기 어렵게 되었다. 본 논문에서는 저주파수계전기의 운용계획을 수립하는데 있어서 필요한 정보를 동시에 통합적으로 볼 수 있고 사용자의 계획상의 자유도와 이용 편리성을 높인 윈도우즈 기반의 모의 프로그램을 개발 하였다. 본 프로그램을 이용하여 대형 계통에서 보다 효과적인 저주파수계전기의 운용이 이루어 질 수 있을 것으로 예상된다.
전영환,이동근 원광대학교 치의학연구소 1993 圓光齒醫學 Vol.3 No.2
To repair bony defects with transplanted bone in the body, fresh autogenous bone is undoubtly, the most effective bone graft for clinical applications. But the demineralized bone has the matrix-induced bone formation which was suggested by Urist in 1965. Many authors assisted that demineralized bone powder induces phenotypic conversion of mesenchymal cells into osteoblasts, with high-density bone formation. The process of inducing differentiated cells becomes osteogenic properties. The purpose of this study was to evaluate the osteoinductive capacity of allogenic freeze-dried demineralized bone block (FDD. 7×7㎜) and to compare FDD with the same size of deep-frozen allodeneic bone (DF), fresh autogenous bone (A) after implantation. The histological and ultrastructural features of tissue responses were examined after 1, 2. 4. 6, 8 weeks implantation of each experimental groups in the operative site of the New Zealand white rabbits. The results were as follows : 1. Inflammatory cell infiltration generally has appeared at 1 week, but reduced at 4 weeks in each group, but most severe in DF group. 2. Osteoblastic activity has increased for 4 weeks, but decreased at 6 weeks in each group and there was no significant difference among experimental groups. 3. New bone formation has begun at 1 week, least activations in A groups, and showed the reversal line of bone formation among each group at 6 to 8 weeks. 4. Bone resorption has appeared at 1 week, but disappeared at 4 weeks in both A and DF groups, but more severe in DF than A groups. 5. In ultrastructural changes, the DF group have showed the most remarkable osteoclastic activities among the experimental groups. 6. Osteoid or tangled collagen fibrils near the implanted sites were replaced by more mature, lamellated bony trabeculae during bone remodeling. There was little difference among each experimental groups. 7. During the convertion osteoblasts to osteocyte which embedded within the bone matrix, there was organless-poor cytoplasm, increased nuclear chromatin, abundant rough endothelial reticulum (RER) in each groups. From the above the findings, the DF group showed more bone resorption and foreign body reaction than FDD and A groups, and FDD group showed more new bone formation or osteoblastic activity than DF and A groups in early stage. There was no significant difference of cellular activities among the FDD, DF, and A groups according to the time.