彈·塑性 大變形 問題의 有限要素 해석에 관한 硏究

홍성인,이동주,민택기 충남대학교 공업교육연구소 1986 論文集 Vol.8 No.3

In order to examine the stress and strain fields in an elastic-plastic medium the elastic-plastic finite-element method was developed. In the finite-element method the large strain formulation was used instead of small strain formulations. The updated Lagrange analysis procedure is more suitable for plasticity problems. The formulation derived in this paper was implemented in the nonlinear finite element computer program. It is intended serve as a tool in the analysis of actual manufacturing processes.

PFM方式 直列形 dc-dc Converter에 關한 硏究

鄭然澤,金洪喆 명지대학교 1976 明大論文集 Vol.9 No.-

This paper described the circuits of self-commutated dc-dc converter by the PFM method. The circuit is composed with a smoothing circuit and a thyristor triggered by a UJT relaxation oscillator. The result is that the output voltage of this device can be adjusted more stably by the pulse frequency of the oscillator than that of other methods.

추상 Wiener 공간상의 Feynman 적분 가능한 함수류에 관한 연구

황홍택 國立金烏工科大學校附設生産技術硏究所 1990 産業技術開發硏究 Vol.6 No.-

관광이벤트의 관광경영에 관한 연구

심홍보,김종택 공주영상정보대학 2001 논문집 Vol.8 No.-

관광상품의 한계성을 극복할 수 있는 방안으로 관광이벤트를 제시하였고, 이벤트 주최, 개체자의 관광 전, 중, 후 경영, 지역주민의 관광 전, 중, 후 경영과 관광자의 관광 전, 중, 후 경영에 대한 이론적 연구에 목적을 두었다. 이론적 연구를 통해 99'이천도자기축제를 관광 전, 중, 후로 나누어 사례를 분석해 보았으며 성공요인과 지적 받은 점을 분석했다. 지역 이벤트는 관광상품 개발과 지역활성화 라는 모든 측면에서 중요한 과제라고 생각된다. 인근지역에서 이벤트를 실시하기 때문에 우리도 하는 경쟁적 개최가 아닌 우리 지역만의 독특한 이벤트를 실시한다는 의지가 절실히 요구된다. 그러기 위해서 이벤트 주최, 개최자는 지역주민들과 함께 자신들의 지역을 재인식하고, 지역 이익 창출 기회로 사용한다면 지역활성화 방안으로는 최상이 수단이라고 생각된다. 또한 이벤트가 국내적인 규모를 넘어서서 국제적으로 발돋움하기 위해서는 지역이 갖는 특성을 고려하고 타 지역과 차별화 된 이벤트를 개발해야 하며, 이벤트 개발에 따른 참여업체의 세제 및 법적 지원방안이 강구되어야 하고 민간업체의 역할과 지방자치단체의 역할을 명확히 하여 가장 한국적인 것이 세계적인 것이 될 수 있도록 민관 모두 노력을 기울여야 할 것이다. 마지막으로, 의식적인 노력으로 항상 새로운 축제를 준비하는 자세로 매년 새로운 목표를 추가하는 것도 필요하다.

비정상 질확대경검사 소견을 보이는 환자에서 환상투열요법의 직접적 적용에 관한 연구

우헌탁,이철민,박교훈,조용균,최훈,김복린,이홍균 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2

Objective: Large Loop Excision of the Transformation Zone (LLETZ) has been widely used for evaluating cervical dysplasia/cancer. We performed this study to evaluate if colposcopically suspected cervical high-grade dysplasia or cancer could be directly evaluated and treated with LLETZ. Methods: 93 women who were scheduled for colposcopic evaluation because of an abnormal cervical cytology report were included in the study in Sanggye Paik Hospital from Jan to Dec 2001. Mean age of the study population was 38.6±9.0. colposcopy directed punch biopsy was not performed and histologic diagnosis was made by LLETZ. Sensitivity and specificity of colposcopic evaluation was calculated and compared with those of cervical cytology. Results: On histopathological examination by LLETZ, 11(11.8%) patients had invasive cancers including 3(3.2%) adenocarcinomas. The sensitivity and specificity of colposcopy for the detection of cervical dysplasia or cancer was 71.7% and 72.3% respectively, wile those of cytology was 56.5% and 74.5% respectively. Conclusion: LLETZ may be adequately performed for the diagnosis and treatment of cervical dysplasia/cancer based on the results of pap smear and colposcopy without punch biopsy. Cost benefit might be anticipated while cost-effectiveness analysis is necessary in the future.

SIIM 퍼지 PID 제어기를 이용한 3축 푸마 로봇의 경로 제어에 관한 연구

석홍성,채창현,고택범,김희년 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-

This paper describes the design of the Fuzzy PID controller using simplified indirect inference method. First, the fuzzy digital PID controller are derived from the conventional continuous time linear ones. Then the fuzzification, control-rule base, and defuzzification using SIIM in the design of the fuzzy digital controller are discussed in detail. The resulting controller is a discrete time fuzzy version of the conventional digital PID controller, which has the same linear structure, but are nonlinear functions of the input signals. The proposed controller enhances the self-tuning control capability, particularly when the process to be controlled is nonlinear. When the SIIM is applied, the fuzzy inference results can be calculated with splitting fuzzy variables into each action component and are determined as the functional form of corresponding variables. So the proposed method has the capability of the high speed inference and adapting with increasing the number of the fuzzy input variables easily. Computer simulation results have demonstrated the superior to the control performance of the conventional digital PID controller. Lastly, it is applied to the trajectory control of the PUMA robot with three-axis.

햇볕정책과 남북한 경제관계

전홍택 연세대학교 통일연구원 1999 통일연구 Vol.3 No.2

The South Korean Government has actively promoted economic exchange with the North based on the principle of separating politics from economics as a strategy to implement its engagement policy toward North Korea, better known as the "Sunshine Policy".The has not been, however, much progress in intra-Korean relations, except for the Mt.Kumgang tours, despite continued endeavors by the South Korean Government. There art two important reasons for the sluggishness of intra-Korean economic relations.First, the investment environment in North Korea is extremely poor as a result of continued economic crisis; and intra-Korean trade cannot increase significantly unless the North Korean economy is revitalized.Another important reason ofr sluggish intra-Korean economic relations is North Korea's recalcitrance against Chinese-style open-door and reform policy as well as government level cooperation with the South. Still, North Korea is hesitant to abide by the above prescriptions because it worries that such a policy may undermine regime stability.Therefore, it is best to provide and environment that will make North Korea shift its policy to peaceful coexistence between the North and the South through a comprehensive approach to the engagement policy.If North Korea can be persuaded to shift its policy to peaceful coexistence with the rest of the world including South Korea, North Korea's economic difficulties will begin to ease. As North Korea can see a light at the end of a long tunnel of economic hardship, it will likely undertake the first step of economic reform and opening with more confidence in regime survival.If this is the case, there may arise a virtuous cycle in North Korea of cautious reform and opening, recovery of North Korean economy with more investment by South Korean and foreign firms, and a next step to al more fundamental reform.

卒業定員制 實施 以後의 被學事警告者의 實態에 關한 調査硏究 : Focusing on the BNU Students of Academic Years 1981 and 1982 釜山大學校 1981, 1982學年度 入學生을 中心으로

林再澤,鄭弘燮 釜山大學校 學生生活硏究所 1982 硏究報 Vol.18 No.1

The present study is an attempt to find some informations of the under-graduate students who were probated or dismissed by BNU for unsatisfactory academic reasons since the Graduation Quota Policy. The variables considered in this research were several life backgrounds, college entrance examination score, attitudinal characteristics, and personality of the students. The subjects were 1961 students (1330 freshmen and 631 sophmores) who were probated or dismissed by the BNU regulations for Spring and Fall semesters of Academic Year 1981 and Spring semester of Academic Year 1982. The Groduation Quota Policy refers to a new educational system in which, out of 130% of college entrees, only 100% of the students are supposed to be given bacelers degree, whereas the rest of students (30%) are supposed to drop out of college programs since the Academic Year 1981 in case of every College and University in Korea. According to the implementation of this policy. students with a cumulative undergraduate course average below 1.8, or two or more grade F for two or more times before the graduation of the college are removed their name from the register by the school. The life backgrounds and the attitudinal characteristics of the subject were measured on the questionaries which were established by the Student Guidance Center at BNU, and their Personality Characteristics were measured on the Standardized Personality Diagnostic Test by Sang Ro Lee et al. These data including the subjects' college Enterance examination scores were collected at the beginning of the subjects' college entrance. As a reference, we constrasted some variables of the subjects with those of the other equivalent students including the subjects at BNU. The major findings are as follows: 1) The students who were probated or dismissed for unsatisfactory academic reasons after implementation of Grduation Quota System relatively increased more than those before the implementation of Graduation Quota System, that is, 11.7% to 1.8%, 11.2% to 1.9%, and 10.3% to 0.8% at Spring and Fall semesters of Academic Year 1981 and Spring semester of the Academic Year 1982 respectively. 2) By the analysis of data in terms of the place of residence family atmosphere, and socio-economic status, there were no significant difference between the distribution of the subjects and that of the other equivalent general students. But the propotion of the rural subjects were significantly higher that of urban subjects on the .005 level of significance. 3) There were no significant differences between the distribution of the subjects and that of the other general students according to the liberal high schools and the specialized high schools including commercial, technical, agricultural schools. 4) The less college entrance examination scores the subjects earned, the higher proportion of them were probated or dismissed by BNU concerned for unsatisfactory academic performance reasons. 5) There were a little significant relations between college entrance examination score and the subjects involved. That is, the subjects who have earned less college entrance examination scores appeared more dominant in the order of humannities, physical sciences, social sciences, engineering, and arts area. 6) Students who earned the college entrance examination scores under the lower 30 percentile in each department were equal to 41.9% of all the probated and dismissed students. and the propotion of the subjects who were higher than 20 percentile of college entrance examination score distribution of the whole students each department appeared 9.8 percent of the total subjects. 7) Where were no significant differences between the distribution of the subjects and that of the other general students in terms of types of perception of the social problems, levels of satisfaoften with their areas of study, level of interest in circle activities, and personality traits

n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구

유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.

鐵筋콘크리트 建物의 經濟的인 構造設計에 關한 硏究

朱京在,李好璡,尹弘澤,서치호 건국대학교 1982 學術誌 Vol.26 No.2

In general most of structure in our country, has steel of SBD 24 combining 180kg/cm2 or 210kg/cm2 of standard compressive strength of concrete. When we consider economical design in structural and practical operation, this paper has estimated steel quantities by combining the design standard strength of steel with those of concrete in reinforced concrete building which has four stories for office and then compared each other. As a result of comparing the quantities of steel according to their combination, it has searched for which combination has consumed less steel and become economic.