영역/경계 분할 정식화에 의한 삼차원 접촉 해석의 효율성 검토

김용언,류한열,신의섭,Kim, Yong-Uhn,Ryu, Han-Yeol,Shin, Eui-Sup 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.4

많은 계산량이 요구되는 삼차원 접촉 문제의 효율적인 유한요소 해석을 위하여 영역/경계 분할 기법을 적용하였다. 접촉 경계면의 부등식 적합 조건과 부영역, 공유면, 접촉 공유면의 등식 적합 조건을 모두 벌칙 함수로 처리하였다. 이에 따라 모든 유효 강성 행렬이 양 정치화되므로, 역행렬과 같은 각종 행렬 연산이 매우 간편해진다. 또한 전체 영역의 형상이 복잡하더라도, 임의의 부영역, 공유면, 접촉 공유면 단위로 쉽게 유한요소 모델링할 수 있다. 즉, 관련 지배 방정식은 물론 경계 조건도 독립적으로 이산화할 수 있으므로, 국부적인 비선형 접촉 조건에 대한 효율적인 해석이 가능하다. 간단한 수치 예제를 통하여 삼차원 접촉 해석의 효율성에 관한 기본적인 경향을 검토하였다. A domain/boundary decomposition technique is applied to carry out efficient finite element analyses of 3-D contact problems. Appropriate penalty functions are selected for connecting an interface and contact interfaces with neighboring subdomains that satisfy continuity constraints. As a consequence, all the effective stiffness matrices have positive definiteness, and computational efficiency can be improved to a considerable degree. If necessary, any complex-shaped 3-D domain can be divided into several simple-shaped subdomains without considering the conformity of meshes along the interface. With a set of numerical examples, the basic characteristics of computational efficiency are investigated carefully.

영역/경계 분할 정식화에 의한 열기계학적 연계 해석의 효율화

김용언,김성준,신의섭 한국항공우주학회 2007 한국항공우주학회 학술발표회 논문집 Vol.- No.-

새로운 병원균 Pseudomonas brenneri에 의한 느타리 세균갈색무늬병

김용언,안지혜,김영기,차재순 한국버섯학회 2012 버섯 Vol.16 No.1

세균갈색무늬병(bacterial brown blotch)은 양송이, 느타리, 팽이 등 여러 재배버섯에 발생하여 많은 피해를 주는 경제적으로 중요한 병해이다. 느타리에서 세균갈색무늬병은 매우 다양한 병징을 나타내며, 병원균으로 Pseudomonas tolaasii, P. agarici등이 보고되었다. 충북대학교 식물의학과 식물세균학 실험실에서는 지난 수년간 다양한 느타리 세균갈색무늬병 병징으로부터 세균을 분리하여 보관하였다. 이렇게 수집한 세균은 16S rRNA 유전자 염기서열을 분석하여 동정하였다. 다양한 세균의 16S rRNA 유전자 염기서열의 상동성을 분석하여 그룹화하고, 각 그룹의 대표균주를 수한품종의 느타리에 접종하여 병원성을 확인하였다. 병원성 확인 결과 기존에 병원균으로 보고된 Pseudomonas tolaasii외에 Pseudomonas brenneri가 전형적인 갈색무늬병 병징을 유도하였다. 병징은 발생 초기, 느타리 갓에 불규칙적인 갈색반점과 수침상이 생겼으며, 발생 후기로 갈수록 갈색 수침상의 색이 밝은 노란색으로 변하며, 병반의 범위가 확대되었다. 대에서 병징은 발생 초기에는 P. tolaasii와 유사한 갈색의 반점이 나타났으며, 후기에는 갈색반점이 대의 전체로 퍼지는 P. tolaasii와는 다르게 대의 반점 확산은 빠르지 않았다. 갓과 대 모두 발병 후기에는 노란색의 세균덩이가 관찰되었다. 이 병징으로부터 다시 세균을 분리하였으며, 분리한 세균의 16S rRNA 유전자 염기서열에 의해 동정한 결과 접종한 Pseudomonas brenneri으로 동정되었다. Pseudomonas brenneri는 자연 상태의 mineral waters에서 2001년 분리된 간상의 그람 음성균으로, 세균분류학적으로 P. fluorescens 그룹에서 분리된 종이다. Pseudomonas brenneri는 느타리세균갈색무늬병을 일으키는 가장 중요한 병원균인 P. tolaasii와는 다르게 WLRO 균주와 대치배양에 의해 white line을 형성하지 않았다.

반도체 스위치 발열 화재예방 장치 개발에 관한 연구

김용언,이만수 대한안전경영과학회 2016 대한안전경영과학회 학술대회논문집 Vol.2016 No.11

ABO 血液型과 出生時體重과의 關係

金容彦,韓東燮,柳東林,朴英海 대한소아과학회 1971 小兒科 Vol.14 No.2

火傷 및 凍傷이 家兎 各臟器 組織內水分量 및 電解質分布狀態에 미치는 影響

金容彦 中央醫學社 1964 中央醫學 Vol.7 No.6

Rabbits were subjected to burn and frostbite to study variations in the tissue electrolyte distribution, extracellular space and total Na +K. Ninety animals were divided into 5 groups, 2 being burn injured, 2 frostbitten and 1 control. Observations were carried out after 24 hours and 48 hours respectively in each experimental group by flame photometry and chemical methods. The results were as follows; 1, Burn and frostbite effect a remarkable decrease in serum electrolyte. 2. Na and Cl increased in the liver of both burn and frostbitten groups, while K decreased in the liver of the former and increased in that of the latter groups. 3. Na increase and K decrease were effected in the kidney of both experimental groups. 4 Both Na and K decreased in the lung of each groups, while Cl increased in that of the frostbitten groups. 5. Water content increased in the skeletal muscle of both experimental groups suggesting a muscular edema. Both Na and Cl increased in this tissue, but K decreased in both experimental groups. 6. The decrease in Na and increase in CI are common in the cardiac muscle of both experimental groups, but K increased only in that of the frostbitten groups, 7. All of the Na, K and Cl decrease in the brain and spleen of the both experimental groups, resulting in a low electrolytic condition. In resume, burn and frostbite bring out an extremely low electrolyte contents in the serum effecting a hydremic condition to the animal. In the other tissues except the brain and spleen both Cl and Cl space increments are a ubiquitous effect in burn and frostbite, suggesting a possible relationship with tissue excitability. Na and K variations antagonize in most cases and their specificities with respect to different tissues and stresses are noted, with all the effects being more accentauated at 48 hours than 24 hours after burn and frostbite.

전력산업에서의 대·중소기업간 협력에 의한 신제품공동개발 메커니즘에 관한 연구

김용언(Kim, Yong-eon),신철호(Shin, Cheol-ho) 한국상품학회 2009 商品學硏究 Vol.27 No.1

본 연구는 기업간 협력에 의한 신제품개발 메커니즘을 정리하는 것을 목적으로 하였다. 신제품개발 메커니즘 도출은 후발기업이 선도기업과 유사한 메커니즘을 가진 프로세스를 거칠 경우 선도기업과 동일한 성과를 얻을 수 있거나 적어도 많은 시행착오를 줄일 수 있음을 의미한다. 연구 방법은 기업간 협력에 의해 세계적인 특허기술을 보유하며 고유의 브랜드로 국내외 시장을 확장하고 있는 사례에 대해서 8년여의 직접적인 관찰결과를 분석, 정리하였다. 분석방법은 ser-M 모델을 활용하여 세 가지 관점에서 접근하였다. 첫째 관점은 사업을 이끈 주체의 역할과 주체가 활용한 보유자원, 그리고 신제품 개발환경을 둘러싼 환경의 상호작용 등 메커니즘 형성요인이며 둘째 관점은, 성공요소와 각 요소들의 작동순서와 시점 등 메커니즘 구조와 원리이며, 마지막 관점으로 학습과 조정, 그리고 선택 등의 과정분석이다. 본 연구 결과는 신제품개발로 경쟁력을 강화하고자 하는 기업에게 기업간 협력의 중요성과 역량 구축과정, 기업 내부자원 공유나 협업 체제와 관련한 전략적 의사결정과 실행에 이해를 높일 것으로 평가된다. The objective of this paper is to define a new product development mechanism(NPD-M) underlying in cases of inter -firm cooperation of power plant industry. By defining a NPD-M, later firms(early movers) are able to achieve similar performances or reduce trial and errors during similar processes of former firms(followers). The methodology of this study is to record and analyze direct observation results for 8 years, of a single case which concerns the achievement of a world-class patent and deals with successful expansion in domestic and international markets using a unique brand. Analytical approaches were made in three perspectives based on the ser-M framework. The first perspective includes the mechanism-building factors which refer to the firm’s role of business, resources which were facilitated, and environmental interactions surrounding NPD. The second perspective concerns the mechanism’s principle and structure, such as success factors and the mechanical sequence and timing of those factors. The third perspective is the process analysis of the mechanism, which deals with the steps of learning, adjustment, and choice. It is expected that the results of this study will offer greater understanding over the importance of inter-firm cooperation and strategic decision making, which concern the process of building capabilities, sharing internal resources and cooperative structures.

Reduced Glutathione의 投與가 CCl₄ 中毒家兎의 肝및 肺組織의 Sulfhydryl基 및 蛋白量에 미치는 影響

金容彦,朱永恩 慶北大學校 醫科大學 1974 慶北醫大雜誌 Vol.15 No.2

LED Dimming 시 발생하는 고조파 연구

김용언(Yong-Eon Kim),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2019 한국조명·전기설비학회 학술대회논문집 Vol.2019 No.5

Reduced Glutathione의 投與가 CCl_4 中毒家兎의 肝및 肺組織의 Sulfhydryl基 및 蛋白量에 미치는 影響

金容彦,朱永恩 慶北大學校 醫科大學 1974 慶北醫大誌 Vol.15 No.2

The present study was undertaken to clarify the hepatotoxic effect of carbon tetrachloride(CCl_4) and to observe a possible toxic effect of CCl_4 on the lung tissue, as well as to elucidate the effectiveness of reduced glutathione (GSH) to the CCl_4 intoxicated animal. The rabbit was used throughout the entire experiment, and the mixture of CCl_4 and olive oil(1:1) in dose of 0.3㎖ or 0.5㎖ per ㎏ BW were administered intraperitoneally twice weekly for one or two weeks, and changes of protein, NP-SH (non-protein sulfhydryl) and NP-SS (non-protein disulfide) of the liver as well as body weight change were observed on hour after the respective CCl_4 administraion as a preliminary experiment to determine the appropriate dose of CCl_4 in the main experiment. All the experimental data obtained from the preliminary study showed decreased values from the control, but when the CCl_4 mixture of 0.3㎖ per ㎏ BW was administered twice weekly for one week the decrease was not as prominent as when higher doses of CCl_4 were used, in which cases the decrease was similar. From the above results, the CCl_4 mixture of 0.3㎖ per ㎏ BW was used twice weekly for two weeks in the main experiment, and the changes of protein, NP-SH and NP-SS of the liver and lung tissues were studied on 1,3 and 5 days after CCl_4 administration. The changes of body weight and liver weight were also measured, and the liver weight/body weight ratios were thus calculated. The results are summarized as follows: 1. The body weight of the control group was 2.23±0.17 Kg and the contents of protein, NP-SH and NP-SS of the liver was 102.31±15.30 ㎎/gm wet wt, 8.01±0.81 μ ㏖/gm wet wt and 6.53±0.52 μ ㏖/gm wet wt, respectively. The contents of protein, NP-SH and NP-SS of the lung in the control group was 47.35±9.85 ㎎/gm wet wt, 3.01±0.4 μ ㏖/gm wet wt and 5.38±0.48 μ ㏖/gm wet wt, respectively. 2. When 0.3㎖ of the mixture of CCl_4 and olive oil per ㎏ BW was administered twice weekly for two weeks, the contents of protein and sulfhydryl groups of the liver decreased noticeably from the control values, while the administration of GSH caused no change from the control. When GSH and CCl_4 were combined, the values were lower than GSH group, but higher than CCl_4 group. 3. The contents of protein and sulfhydryl groups in the lung showed decreased values from the control when CCl_4 was administered, but no change was observed when GSH was administered, and when GSH and CCl_4 were combined the values showed intermedially between the CCl_4 and GSH groups. 4. The decrease of the body weight by CCl_4 injection was prominent but the liver weight increased noticeably. Thus, the liver weight/body weight ratios were elevated from the control value of 20.27 throughout the experiment. When GSH was used, the ratio did not change from the control but the combined administration of GSH and CCl_4 produced higher ratio than the CCl_4 group. 5. From the above, it may be concluded that CCl_4 produced a toxic effect to the lung as well as to the liver, but the degree of toxicity seems to be less in the lung than in the liver. Also, the effect of GSH seems to be not as obvious in the lung as in the liver.