http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
CAE 응용설계 기법을 이용한 클램프 척(Clamp chuck)의 금형설계 개선에 관한 연구
신명균,허용정,강성남 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1
사출성형에 관한 연구는 오랜 역사를 가지고 있으며 공정 시뮬레이션을 위한 상용화된 CAE 프로그램을 포함하여 많은 연구가 진행되는 분야중의 하나이다 그러나 다양한 고분자 재료의 성질, 금형의 복잡한 형상 및 성형조건 등의 변화로 인해 금형설계 및 제작 그리고 사출성형시 상당한 어려움을 겪게 된다. 사출성형 공정에서는 금형온도, 플라스틱 재료, 냉각수, 보압과 사출압 등의 여러 가지 공정변수가 있어 현장전문가의 경험에 의해 사출금형의 제작이 이루어지는 경우가 보통이다. 이와 같은 경험에 의한 금형 제작은 상당한 납기지연과 노동집약적인 방식으로 흘러가게 된다. 금형 제작시 가장 고려해야 될 사항 중의 하나는 사출성형품의 수축이다. 사출성형에서 용융수지는 냉각, 고화하면서 수축하는데 성형품 치수를 유지하기 위해서는 수축하는만큼 금형의 치수를 보정하여야 한다. 이 수축률은 사용수지의 종류와 성형품 트기, 살두께 등에 따라 다르다. 또 동일한 수지일 경우에도 성형조건에 따라 변화하고 특히 배향성을 가진 수지는 유동방향에 따라서도 변화가 있다. 즉, 금형의 온도가 높으면 수축률은 증가하고 사출압력이 높으면 감소한다. 또한 살두께가 두껍고 길이가 길 때 수축률은 증가한다. 방향성이 있는 수지는 유동방향에 대하여 직각방향에서 가장 적다. 특히 방향성이 현저한 HDP에서는 유동방향에 따라 수축차가 크므로 성형할 때 변형을 일으키는 경우가 많다. 일반적으로 PE, PP, PA와 같은 결정성 수지는 PS, SAN, ABS 등의 비결정성 수지보다 수축률이 크다. 본 연구에서는 한조산업사에서 제작한 '클램프 척' 금형 제작과정에서 성형품의 수축으로 인한 금형의 치수보정에 있어서의 문제점을 유동해석 전용 CAE 프로그램인 C-mold를 사용하여 해석하고 평가하였다. 그리하여 현장 전문가가 경험적으로 여러 번의 시행착오를 거쳐 완성된 금형을 제작하던 기존의 방법보다 체계적이고 합리적이며 또한 신속하게 문제를 해결함으로써 궁극적으로 금형설계 및 제작 기간을 단축하고자 한다.
李容準,李明雨,朴英錫,鄭時潤 명지대학교 공학기술연구소 1991 공학기술연구소 논문집 Vol.6 No.-
Numerical model for predicting the deflections and stress distribution due to creep and shrinkage of concrete and relaxation of prestressed steel of the segmentally erected indeterminate prestressed concrete bridge is presented in this paper. The computer program considering the presence of the reinforcement, the difference in ages of the concrete segments, the multiple stages in which the external loads and prestressing forces are applied, and the changes in geometry and support conditions as the construction progresses is developed. The proposed method is applied to a three-span continuous bridge and four-span continuous bridge, and the results indicate the significance of the time-dependent effects.
박원명,김용찬,백인호 大韓神經精神醫學會 1986 신경정신의학 Vol.25 No.2
This is a clinical report of 4 cases of restless legs syndrome developed in patients diagnosed as major depressive disorder by DSM-III criteria, who were treated with "Mianserin" which is known as one of the new generation tetracyclic antidepressants. With the duration of the average of 1 or 2 weeks following the administration of mianserin, all of these patients showed characteristic symptoms of restless legs syndrome which included unpleasant creeping sensation and vague discomfort on the both legs at rest typically in the evening and during the night. For the prevention of exacerbation of these symptoms, hotbag, diazepam, lowering or discontinuation of mianserin, and shifting to another antidepressants including tricyclic antidepressants had concurrently been tried and proved effective.
사이버공간에서 정보보호 예방활동에 영향을 미치는 요인에 관한 탐색적 연구
엄명용,김미량 한국정보사회진흥원 2007 정보화정책 Vol.14 No.1
인터넷과 같은 새로운 기술들이 등장함에 따라 인신공격, 사기, 비방, 그리고 저작권침해 등의 각종 범죄행위들은 형태를 달리하여 사이버공간에 침투하였고, 이러한 부작용에 경각심을 느낀 네티즌들은 사이버공간에서 자신의 정보를 보호하기 위한 방편을 탐색하기 시작하였다. 이러한 배경에서 본 연구는 네티즌들의 정보보호 예방활동을 유인하는 핵심요인들을 찾아내고 정책적 시사점을 얻고자 수행되었다. 연구결과 다음과 같은 두 가지 성과를 얻을 수 있었다. 첫째, 정보보호 예방활동을 유발하게 하는 유인요인을 부정적 유인요인(개인정보 유출경험, 인지된 부정적 익명성, 인지된 불신, 잠재된 두려움)과 긍정적 유인요인(정보보호 유용성)으로 구분하고, 요인 간 인과관계를 탐색적으로 실증한 결과 제안된 가설들이 모두 유의하게 도출되었다. 둘째, 정보보호 예방활동에 관한 교육이나 정책방향은 부정적 유인요인 보다는 긍정적 유인요인을 중심으로 진행하는 것이 강한 교육적 효과를 얻을 수 있다는 사실을 발견하였다. 본 연구결과는 앞으로 정보보호 예방활동을 계획하고 운영하는 데 있어 정책적 시사점을 제공할 것으로 본다. New technologies such as the Internet have not only radically changed the means by which one communicates, conducts business, and engages in recreation, but have also brought new avenues for criminal pursuits and new forms of victimization. Media and government reports suggested a notable increase in cyber crimes, with significant losses attributed to Internet fraud. As a relatively new form of crime, the effects of internet crime and fraud are often discussed in terms of financial losses as well as indirect effects of Internet crime and fraud to younger generation. The purpose of this research is to identify the determinants of planned behavior of college students, toward information security and private information protection. A survey methodology was used to investigate a proposed model of influence, and a structural equations modeling approach was used to analyze the results. The hypothesized model was largely supported by this analysis, and the overall results indicate that the intention to actively participate in private information protection is mostly influenced by the fear for cyber crime and the perceived usefulness of information protection activity as well as perceived level of mistrust. In addition, it was found that the prior experience with information leaking and perceived level of anonymity are statistically significant to the level of perceived level of mistrust and fear for crime. Other results and useful suggestions for promoting information protection in cyberspace are also presented.
EMTP MODELS를 사용한 거리계전기법 구현에 관한 연구
이명희,최해술,서용필,김철환 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
This paper presents a new distance relay modeling techniques which avoids unnecessary computational procedure. A general-purpose simulation language, called MODELS, has been added to the software ATP(Alternative Transients Program) providing a new option to perform numerical and logical manipulations of variables of an electrical system. This language has been designed to replace the previous option TACS(Transient Analysis of Control Systems) which permits to simulate a control system in conjunction with a large power network. One purpose of this study is to build a structure for modeling of digital distance relays within EMTP MODELS. Contrary to the traditional methods, the new method using MODELS reduce the number of simulation steps in modeling the distance relay.
黃明燦,玄斗日,梁始浩,朴英熙,金龍國,申大淳 건국대학교 1974 學術誌 Vol.17 No.1
The New Village (Sae-ma-eul) movement is Korean version of Community Development that has under-gone widespread exploration, experimentation and application in developing countries throughout the world in recent years. In most countries the national governments have undertaken the iniative in Community Development through appropriate ministries or special agencies. The New Village Movement was initiated in 1970 by Korean government. But it became a people's movement for self-development as more and more people participated in the developmental programs. The major objectives of the New Village movement are to redress the economic disparities between the rural and urban areas by improving the economic, social and cultural conditions of rural Communities, to reform the way of life in rural villages by encouraging the attitude of self-help, and to increase the income of the farmers and fisher man. Since 1971, An enormous amount of public and priate money has been invested into the New Village Movement. It seems that the time has arrived when some framework for evaluating the whole program is to be developed. Thus, The objective of this study is to develop an appropriate to evaluate the new village project at the village level. Ten major factors which are supposed to be relevant for evaluation of the project was selected. The evaluation model thus developed can be summarized in the following format. ◁표 삽입▷ (원문을 참조하세요)
토양환경보전법의 비교법적 분석 : 독일의 연방토양보호법을 중심으로 im Vergleich mit dem deutschen BBodschG
김명용 한국환경법학회 2002 環境法 硏究 Vol.24 No.1
Mit dem Inkrafttxeten des Wenschutzgesetzes kann der Men, das neben dem Wasser und der Luft dritte Umweltmedium, durch sein eigenen Gesetz geschutzt werden. Vor dem ErlaR des Gesetzes ist der Wen als Luft und Wasser nachhaltiger behandelt worden. Die Griinde hierfiir lagen zum einen darin begriindet, daR im allgemeinen BewuRtsein die Umweltprobleme in den Ekreichen Abfall, Luft und Wasser sehr gravierender und sichtbarer waren als beim Men . DaR Umweltbelastungen bei der Schadstoffsenke Boden durch dessen Filter- und PufferkapazitAten wesentlich l were &it als bei den homogenen und sich sehr schnell verteilenden Medien Luft und Wasser verborgen bleiben, dann aber um so nachhaltiger sind, gehorte in dieser Zeit wohl zum wissenschaftlichen Kenntnisstand, nicht aber zum offentlichen BewuRtsein. Zum anderen handelte es sich bei Luft und Wasser um freie Medien, deren Nutzung durch neu zu schaffende gesetzliche Vorschriften endlich auch okonomisch relevant werden sollte. Die vorliegende Abhandung mu13 vor allem darauf ausgerichtet sein, schadliche Bodenver&demgen zu vermeiden und daftir Vorsorge zu tragen, daI3 keine neuen Bodenklastungen entstehen. Inf olgedessen versucht die Abhandlung vorsorgende MaI3nahmen fiir die Bodenverschmutzung und quantitative und qualitative Bdenschutz maI3nahmen im deutschen Bundes-Bodenschutzgesetz zu erkl2iren. Im Vergleich mit dem deutschen Bodenschutzgesetz sollen sich Probleme des koreanischen Bodenschutzgesetzes ausgewiesen und damit eine Reformvorschlage fiir das koreanische Bodenschutzgesetz vorgelegt werden.
Nevile-Winther's Acid의 Azocopling 反應에 關한 硏究
金容仁,金鍾明 弘益大學校 1981 弘大論叢 Vol.13 No.-
The azocoupling reaction of Nevile-Winther's acid with several meta-and para-monosubstituted benzenediazonium salts has been studied kinetically in aqueous solution buffered at pH 5. The activation energies measured in the coupling reaction of Nevile-Winther's acid with diazotized m-nitroaniline, p-nitroaliline, sulfanilic acid, m-anisidine, p-anisidine, m-toluidine, p-toluidine, p-fluoroaniline, p-chloroaniline, p-bromoaniline, p-iodoaniline and aniline are 6.27, 5.84, 7.51, 12.05, 13.22, 12.25, 12.83, 10.12, 9.20, 8.60, 8.26 and 11.52 Kcal/mole, respectively. The rate for coupling reaction is more favorable in the presence of an electron-withdrawing group in active components than in the presence of electron-donating group. We observed that the coupling reaction with diazotized m-nitroaniline proceeds 400 times more rapidly than that with the benzenediazonium salt, which is coupled 20 times faster than p-methoxy benzenediazonium salt. A linear free energy relationship has been essentially observed except for three parasubstituted active components, for which the extended Hammett plot treated by Yukawa-Tsuno permits a good log k/k???=ρ[σ+rΔσ??????] linear relationship when considering the mesomeric effect. The calculated reaction constant of thses azocoupling reactions is ρ=3.51. The reaction constant of resonance contribution r is calulated as r=0.32. In the case of the reaction with para-halo-substituted active components, the reaction rate increased in the order of p-fluoroaniline, p-chloroaniline, p-bromoaniline and p-iodoaniline, contributing partially to the solvation effect. 1. 緖 論 2. 實驗方法 2-1. 試藥 및 實驗裝置 2-2. p-置煥 haloaniline 類의 合成 2-2-1. p-fluoroaniline의 合成 2-2-2. p-chloroaniline의 合成 2-2-3. p-bromoaniline의 合成 2-2-4. p-iodoaniline의 合成 2-3. p-置煥 haloaniline의 純度試驗 2-4. passive components의 coupling value 試驗 2-5. active component 反應溶液의 調製 2-6. 比色定量用 azo化合物의 合成 2-7. 比色定量用 azo化合物의 paper chromotography 2-8. 檢量線의 作成 2-9. azocoupling反應 2-10. azo化合物의 定量 2-11. passive component의 이온常數 測定 3. 實驗結果 및 考察 3-1. p-置煥 haloaniline類의 合成結果 3-2. Nevile-Wintber's acid의 coupling value 3-3. Nevile-Winter's acid와 一置煥 benzenediazonium鑒類의 coupling 反應 3-4. activation parameters 3-5. Nevile-Wintber's acid의 azocoupling反應性 3-6. active component 分子內의 置煥基效果 3-7. Hammett 則의 適用 4. 結 論