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尹秉根,金燁 慶熙大學校 1991 論文集 Vol.20 No.-
Generalized random walks which include blind ants and myopic ants in labyrinth as sepcial cases are suggested and considered. The diffusional susceptibilities of such walks are calculated on the diluted linear chain and on percolation clusters of Cayley tree. From these calculations we conclude that the generalized random walks do not belong to a universality class.
Enamel and Dentin dysplasia를 동반한 소아환자의 치험례
김용기,윤병근 大韓小兒齒科學會 1994 大韓小兒齒科學會誌 Vol.21 No.2
Very few reports are available on the occurrence of abnormality of both enamel and dentin. This case has some characteristiced of both amelogenesis imperfecta and dentinogenesis imperfecta. Clinically, the enamel of primary dentition was completely absent and when the permanent teeth came to the pediatric dept. of Dankook University Dental Hopital for treatment. Fixed-romovable type resin plate was delivered to increase vertical dimension and to solve esthetic and functional defects. Hypoplastic teeth were restored either stainless steel crown or composite resin restoration or both. The periodic recall check and oral hygiene education are recommended.
수종의 글라스아이오노머 수복재의 불소유리량과 2급 와동 수복시 인접치아의 법랑질에 미치는 항우식 효과에 관한 비교 연구
김용기,윤병근 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1
The purpose of this study were evaluated for fluoride release from vairous kinds of glass ionomer filling materials to deionized distilled water and fluoride uptake by enamel on adjacent tooth and anticariogenic effect after class Ⅱ restoration with glass ionomer materials. Ketac-Silver, Mifacle-Mix and Dyract were used for this study as a restorative material. Fluoride concentration released in solution from discs made of selected materials were determined daily for the first 7 days and on the 14th, 21st day. After embedding the plastic mold which filled with materials and teeth with acrylic resin measurements of fluoride uptake by enamel on adjacent tooth and observation of anticariogenic effect after class Ⅱ restoration with galss ionomer materials. The results can summarized as follow : 1. The highest amount of fluoride released in each group at first day, decreased amount as time go. Miracle-Mix released more fluoride than all other materials tested. 2. GroupⅠ and Ⅱ, Goup Ⅱ and Ⅲ, GroupⅠ and Ⅲ showed statistically significant difference amount of fluoride released(p<0.05) except 1, 2, 3 day in GroupⅠ and Ⅲ. 3. Fluoried amount of uptaked by enamel adjacent galss ionomer materials showed statestically significant difference each groups(p<0.05). GroupⅠ more fluoried uptake than Group Ⅲ, and Group Ⅱ more fluoried uptake than GroupⅠ.(p<0.05) 4. Comparison of lesion depth, all experimental group decreased lesion depth than control group(pb0.05) and GroupⅠ more decreade than Group Ⅲ, and Group Ⅱ more fdecreased than GroupⅠ.(p<0.05)
수종의 글라스 아이오노머 수복재의 불소 유리량과 2급 와동 수복시 인접 치아의 법랑질에 미치는 항우식 효과에 관한 비교 연구
윤병근,김용기 단국대학교 치의학연구소 1995 논문집 Vol.7 No.1
The purpose of this study was evaluated for fluoride release of various kinds of glass ionomer filling materials to deionized distilled water, the fluoride uptake and the anticariogenic effect on the adjacent tooth after class Ⅱ restoration with glass ionomer materials. Ketac-Silver, Miracle-Mix and Dyract were used as restorative material for this study. Fluoride concentration released to the solution from discs made of the above mantioned selected materials were measured daily for the first seven days, and then weekly, on the on the 14th and the 21st day. After class Ⅱ restoration with glass ionomer materials, the amount of released fluoride absorbed by the enamel of the adjacent tooth, and the anticariogenic effect on it was measured and observed, respectively. The results can be summarized as follow : 1. The largest amount of fluoride was released in each group first day, and the amount decreased as time went on. Miracle-Mix released more fluoride than all of the other materials tested. 2. The difference in the amount of fluoride released by Groups Ⅰ and Ⅱ, Groups Ⅱ and Ⅲ, and Groups Ⅰ and Ⅲ was statistically significant(p<0.05), except that between Groups Ⅰ and Ⅲ on the first, second and third days. 3. The amount of fluoride absorbed by the adjacent enamel showed statistically significant difference each groups (p<0.05). The fluoride uptake of Group Ⅰ was greater than that of Group Ⅲ, and Group Ⅱ, greater than that of Group Ⅰ(p<0.05). 4. In comparing lesion depth, all experimental groups decreased lesion depth than control group (p<0.05). The decrease was greatest for Group Ⅱ and least for Group Ⅲ (p<0.05).
태양광 발전 시스템에서 태양광 모듈의 부분 음영에 따른 부정합 손실 해석
윤병근(Byung-Keun Yoon),조내수,권우현(Woo-Hyen Kwon) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Generally PV(Photovoltaic) power generation system consists of PV arrays which is parallel connected PV strings. Because of un-uniform characteristic of PV modules and partial shade on PV strings cause mismatch power loss in PV power generation system. So this paper analyzes the mismatch power loss and suggests the improvement method of the mismatch power loss.