개선된 하프변환을 이용한 훼손된 타원 검출

강창원,양환석,이정재,김남중,이웅기 조선대학교 기초과학연구소 1997 自然科學硏究 Vol.20 No.1

This paper considers the problem of detecting elliptical curves using Advanced Hough transform. Storage and efficiency problems are over come by decomposing the problem into two stages. The first stage uses a novel constraint as the basis for a Randomined Hough transform to detect the ellipse centre while the second stage finds the remaning parameters using simple but efficient focusing implementation of the Advaned Hough transform. The method is applicable in many situations where previous Hough transform schemes would fail. Results are demonstrated for comolicated image data containing several occluding ellipses.

재배고들빼기의 화학성분 연구 : Youngia sonchifolia Max

강석환,조규성 한경대학교 2005 論文集 Vol.37 No.-

In this study, chemical compositions of Godulbaegi(leaves and root) were investigated. As for free sugar of the leaves and roots of Godulbaegi, fructose, glucose and sucrose were detected. The total phenolic content was shown higher in the leaves than in the roots. As for amino acid of the leaves of Godulbaegi, 20 kinds amino acids were detected and among them, L-proline and L-glutamic acids were prominent, root of Godulbaegi, 19 kinds amino acids were detected and among them, L-glutamin, L-proline were prominent. As for fatty acid, linolenic acid was prominent in the leaves of Godulbaegi and linoleic acid was prominent in the roots of Godulbaegi. As for vitamin, only the ascorbic acid was detected in the leaves and roots of Godulbaegi and the rest was trace. As for minerals K, Ca, Mg and Na were prominent in the leaves and roots of Godulbaegi.

삭골(Bone shaving)한 골의 재생에 골막이 미치는 영향

강진성,권건영,송중원,오석희,한기환 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.5

Many orientals have a more prominent malar eminence and mandibular angle than westerners so their faces often look rough and unattracive. In recent years more people want to have a more attractive and beautiful face due to economic prosperity and westernization. Therefore people receiving bone shavings or osteotomies for cosmetic purposes are increasing. The effects of the periosteum on lay bone grafts were investigated but the effect of the periosteum after bone shaving or osteotomy is little known. The authors investigated the effect of the periosteum on the regeneration of bone in membranous and endochondral bone of rabbits. Bony defects each measuring about 5.0×5.0×1.5mm were made on the left and right sides of the parietal bones of 15 rabbits and femurs of 15 other rabbits respectively. The periosteum was preserved on the left and removed on the right. The following results were obtained: 1) The average thickness of the regenerated bones in groups 2 δ4 were thinner than those in groups 1 δ 3 at 4, 8 and 12 weeks postoperatively but the differences of thickness were statistically significant at onl 4weeks postoperatively(P<0.05). 2) The histological findings in groups 2 δ 4 showed lesser regeneration of the shaved bone than those in groups 1 δ 3 at 4, 8 and 12weeks postoperatively. 3) There was no significant increase in the thickness of the regenerated bone after 8 weeks postoperatively in all groups. 4) At 12 weeks postoperatively, the thickness of the regenerated bone in all groups was over 70% of the thickness of the resected bone. In summary, the authors found that it is important to perform overcorrection and resect the periosteum simultaneously in bone shaving to prevent the unwanted regeneration.

FEM을 이용한 선삭가공 절삭조건의 영향 분석

임세환,송춘삼,홍석관,강정진,김주현 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

A plane strain finite element model is developed to simulate turning with continuous chip formation using adaptive remeshing during the thermal-mechanical coupled analysis. Comparisons between the experimental and simulation results for cutting forces are performed to validate FE analysis results. Influences of machining parameters such as depth of cut, cutting speed and feed rate on cuting force and shear angle are analyzed by Taguchi method. The more depth of cut and feed rate result in the increase of cutting forces, but the rates of increase are decrease due to the larger shear angle. As the cutting speed increases, von Mises stress of workpiece near the tool tip decreases because the strength of specimen decreases at high temperature above 500℃. This thermal effect on cutting force is negligible because the affected area is very localized and the average values of von Mises stress in the shear plane are the same among the diverse cutting parameters.

절골술을 이용한 안면교정

오석희,한기환,강진성 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.5

The most important factor in the beauty of the face is the harmony of the facial skeleton and soft tissue. The postoperative result is not always satisfying after only classic soft tissue surgery. The reason for dissatisfaction is disharmony of the facial skeleton. Recently, the development of maxillofacial surgical techniques enable disharmony of the facial skeleton to be successfully corrected. The authors have had experience with 33 cases of congenital and acquired facial deformities, from March of 1986 to February of 1989, and have followed them from 6 months to 2 years. We used an intraoral approach in most cases and got good results. There were four wound disruptions which were treated conservatively and resolved without sequelae.

부산시 가로수 현황과 토양환경개선에 관한 연구

김석규,박승범,남정칠,김승환,강영조 동아대학교 건설기술연구소 1999 硏究報告 Vol.23 No.2

The purpose of this study is to analyze the correlation between soil hardness, soil acidity, and the vitality of street trees. This data was investigatived in 40 areas on 10 main street routes of Pusan; Chungang-ro, Naktong-ro, Suyeong-ro, Taejong-ro, Konghang-ro, Kudeok-ro, Kumjeong-ro, Mandeok-ro, Kaya-ro, Chungjang-ro. The findings are as follows : 1. The average soil hardness where tree grates have been built was shown to be 22.23㎜. In the absence of tree grates, the average soil hardness was 24.60㎜. These figures do not exceed the accepted parameters for acceptable soil hardness when rearing trees (22∼25㎜). However, soil hardness was measured higher in areas where tree grates were absent. Consequently, tree grates are necessary. 2. Soil acidity was measured as satisfactory(pH 5.5), mediocre(pH 5.5∼5.0), inferior(pH 5.0∼4.5), very inferior(pH 4.5). No areas were measured as satisfactory soil acidity. Four areas were measured as mediocre(10%), 19 areas as inferior(47.5%), and 17 areas as very inferior (42.5%). This indicates a requirement to improve soil acidity as about 90% of the investigatived areas were measured as either inferior or very inferior. 3. The following is an analysis of correlation between soil hardness, soil acidity and the vitality of the Ginkgo biloba ; The Ginkgo biloba was found to have a positive correlation was measured with the diagram (R²). In conclusion, the results of the analysis show a strong influence of soil hardness and soil acidity upon the vitality of Street Tree.

조구등(釣鉤藤)의 4-VO로 유발한 흰쥐뇌허혈에 대한 신경방어효과

李仁煥,林康鉉,李鍾錫,石庚浩,安德均,朴虎君,김頀哲 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2

Uncariae Ramulus et Uncus(UR, ???) has sweet in flavour and slightly cold in property, acting on the liver and pericardium channels. This drug was described in a medical classic as having the ability to remove "heat", check hyperfunction of the liver and relieve dizziness, tremors, and convulsion, and subdue "endogenous wind". So this study was planned to check the neuroprotective effect of UR on the global ischemia induced by 4-vessel occlusion in Wistar rats. and UR extract was lyophilized after extraction with 70% methanol. We induced 4-vessel occlusion for 10 minutes and reperfused again. The number of CA1 pyramidal neurons were counted after 7 days of reperfusion under the cresyl violet staining. In 4-VO ischemia model, UR showed significantly neuroprotective effects(1,000 and 500 ㎎/㎏ of UR extracts, p<0.05) compared with control group. Each neuroprotective ratio was about 23.0%, 19.0% respectively. Consequently, Uncariae Ramulus et Uncus has neuroprotective effects on the global ischermia induced by 4-vessel occlusion in Wistar rats. So we expect that Uncariae Ramulus et Uncus can be used as a drug for neurodegenerative disease.

퍼지시스템과 진화알고리즘 기반 지역부하예측 시스템개발

張右晳,指眩旻,姜渙一 명지대학교 산업기술연구소 2006 産業技術硏究所論文集 Vol.25 No.-

This paper proposes a time series prediction method for the nonlinear system using the fuzzy system and the evolutionay strategy and the genetic algorithm. At first, we obtain the optimal fuzzy membership function using the evolutionary strategy or genetic algorithm. With the optimal fuzzy rules and its input differences, a better time prediction series system may be obtained. We obtain a good result for the time prediction of the regional electric load. In addition we implement the graphic user interface for the proposed algorithms.

진화알고리즘과 퍼지시스템을 이용한 단기부하예측 시스템개발에 관한 연구

張右晳,李性穆,姜渙一 명지대학교 산업기술연구소 2006 産業技術硏究所論文集 Vol.25 No.-

This paper proposes a time series prediction method for the nonllinear system using the fuzzy system and the evolutionay strategy and the genetic algorithm. At first, we obtain the optimal fuzzy membership function using the evolutionary strategy or genetic algorithm. With the optimal fuzzy rules and its input differences, a better time prediction series system may be obtained. We obtain a good result for the time prediction of the short term electric load. In addition we implement the graphic user interface for the proposed algorithms.

Equisetum arvense L.이 고혈당 쥐의 혈중 포도당 농도에 미치는 영향

이현자,김석환,손기호,강우규,최종원 慶星大學校 環境問題硏究所 1992 環境硏報 Vol.2 No.1

The effect of methanol extract of Equisetum arvense L.(EM) on blood glucose level in streptozotocin-induced diabetic rat and acute toxicity of EM were investigated. Male Sprague-Dawley rats(200∼250g), with free access to commercial rat chow and water, were divided into four groups: Group 1 served as control; Group 2 received STZ only: Group 3 received EM only; Group 4 received pretreatment with EM followed by STZ administration. EM did not affect the normal blood glucose level and LD50 was about 6,250㎎/㎏. EM pretreatment in STZ-induced diabetic rats slightly inhibited Weight loss and water consumption. EM pretreatment in STZ-induced diabetic rats slightly inhibited the rise of serum glucose concentration. Serum transaminase(AST, ALT) and sorbitol dehydrogenase(SDH) were slightly increased by STZ induced changes in the serum glucose level.