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연골성 및 막성 탈회골기질과 탈회상아질기질에 의한 골유도 과정에 대한 연구
류선열(Sun Youl Ryu),신형철(Hyung Chul Sin),김선헌(Sun Hun Kim),김백윤(Baik Yoon Kim) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.2
Bony tissue develops via two different preocesses : endochondral ossification and intramembanous ossification. This study tests the hypothesis that each type of bony tissue contains unique inducing factors for the promotion of cartilage and direct bone formation. Previous studies suggest that both of implants of intramembranous and endchondral bone matrix can induce bone formation through endochondral bone formation, which means that the bone growth properties of the bone matrices are similar. This study was done to know whether the osteoinductive property of intramembranous bone matrix is identical to that of endochondral matrix and that property of demineralized dentin matrix. Endochondral and intramembranous demineralized bone matrices and demineralized dentin matrices were implanted in pectoral muscles of rats. At the 5 days of implantation many spindle shaped mesenchymal cells aggregated around 3 kinds of the matrices. At the 10 days of implantation osteoid tissue formed adjacent to the matrices. At the 14 days implants of endochondral bone and dentin matrices induced bone formation via endochodral and intramembranous ossification in contrast to implsants of intramembranous bone matrix which did not induce endochondral ossification. At the 60 days of implantation, the matrices were absorbed and mature bone formation with trabeculae was proceeded. The matrices were aborbed by macrophages and multinucleated giant cells and osteoclasts which resorb the calcified bone at the same time. These findings suggest that endochondral ossification is not a necessity in the processes of bone formation by demineralized hard tissue matrix and the matrix of endochondral bone differs qualitatively from that of intramembranous bone.
미시적 방법을 이용한 산업체 수용가의 공급지장비용 함수(SCDF) 산정
김용하(Yong-Ha Kim),이평호(Pyong-Ho Lee),김영길(Young-Gil Kim),신형철(Hyung-Chul Sin),오석현(Seok-Hyun Oh),우성민(Sung-Min Woo) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.4
This paper assesses interruption costs on the industry load through using the microscopic method. For assessment, the questionnaire was made on Korea Standard Industry Categorization which is composed of 28 type of industry Then, the survey was distributed to 1889 business in 12 area by staffs of KEPCO. The collected data is changed to the trustworthy data by using Bad Data Selection method and then the interruption costs of industry load was calculated by Tobit Regression which is tool analysing both collected data and the others.
해석적방법론에 의한 산업용 수용가의 공급지장비 산정 및 배전계통에의 적용
김용하(Yong-Ha Kim),우성민(Sung-Min Woo),백범민(Byum-Min Baek),신형철(Hyung-Chul Sin),박창규(Chang-Kyu Park) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.4
본 논문에서는 해석적방법론에 의한 산업용 수용가의 공급지장비를 산정할 수 있는 방법론을 개발하기 위해 산업용 수용가 1,026호를 방문하여 설문조사를 수행하는 미시적 접근법을 사용하여 산업용 수용가의 종별 공급지장비를 표준산업분류에 의한 18개의 업종으로 조사하였다. 얻어진 조사결과를 계층화의사 결정법(AHP; Analytic Hierarchy Process)으로 최적의 공급지장비용 함수(SCDF; Sector Customer Demage Function)를 선정하였다. 이를 통하여 배전계통에서의 신뢰도 가치평가(VBDRA; Value Based Distribution Reliability Assessment)를 위해서 주어진 배전계통 예상 공급지장에너지(EENS; Expected Energy Not Supply), 정전비용기대치(ECOST; Expected Interruption Cost), 차단에너지비율(IEAR; Interrupted Energy Assessment Rate)을 계산하여 그 가치를 평가하였다. 이를 배전계통에 적용하기 위해서 사례연구로 적용하고 공급지장비용을 도출하여 그 특성을 분석하였다. This paper estimates interruption cost assessment for industrial load. For executing In this way first, we research customer interruption cost(CIC) for industrial load about 1,026 unit. And to assess industrial load in D/L calculate sector customer damage function(SCDF) using CIC. Second, we compute distribution reliability through annual failure rate, repair time and so on. and then, Third, distribution system that calculate VBDRA for industrial load per alternative assesses interruption cost.