자동차용 컨트롤 링크 업셋 용접부의 용접성 및 피로강도 향상에 관한 유한요소 해석

조해용,권혁홍,이봉규 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.6

This study is concerned with Finite Element Analysis on welded part of control link for automobile. For analysis, control link was modeled into two parts, ring and rod. Heating condition, temperature distributions and fatigue fracture strength were analyzed using "HEAT Ⅲ" and "ENDURE" module of NISA Ⅱ. Metal flow in the process of welding was simulated by DEFORM^TM 2D. The analyzed results were compared with experimental inspection. Quality of welded part was able to be improved by controlling metal flow in the process of welding by increase the friction constant of ring part. Heat transfer analysis and flow simulations were in good agreement with welding experiments.

유럽공동체 국가들의 환경정책에 관한 연구 : 환경영향평가제도를 중심으로 비교분석 A Comparative Analysis of Environmental Impact Assessment

조해용,강순국 한국환경과학회 1997 한국환경과학회지 Vol.6 No.4

Environmental problems emerged as common global problems awaiting solution. Active collaborative efforts are required of nations and communities in order to solve environmental problems effectively. International collaboration occurs much more commonly these days than before, and European Community(EC) mumber countries are no exceptions. EC has established and executed the five-year programs on Environmental Policy Implementation, which explicated basic principles for environmental policy development, since 1973. EC programs tend to emphasize that the direction of the policies should reflect a change from a remedial approach to a preventive approach. Those programs have brought an awareness of the importance of Environmental Impact Assessment(EIA) to EC member countries. France installed an EIA system in 1976, which was the first among member countries. Several other member countries also established a system. EC decided that a common guideline was necessary, and therefore formulated the "European Community Guideline for Environmental Impact Assessment" in 1985. All member countries were required to legislate an EIA system within three years, according to the Guideline. This study will conduct a comparative analysis of the current EIA systems of different EC member countries. The findings of this study will provide helpful information on how to improve the efficacy of the Korean system.

하천변 식생의 식물사회학적 연구

조해용 선문대학교ㆍ중소기업기술지원연구소 2000 선문공대 연구/기술 논문집 Vol.5 No.1

곡교천의 9개지점을 1999년 4월부터 7월까지 수생 및 습생관속식물의 종조성, 분포 및 식물군락의 구조를 조사하였다. 조사지역에 분포하는 수생식물은 27과 68속 83종 14변종 1아종 2품종이었다. 조사지점에서 가장 빈번하게 채취된 종들은 미국개기장, 소리쟁이, 쑥, 환삼덩굴 그리고 바랭이였다. 그 중 큰개여뀌와 환삼덩굴이 군집네에서 우점종으로 나타났다. 군집의 종다양성도지수는 0.806-1.148이고, E지점이 가장 높았다. 균등도는 0.504-0.841이고. 군집유사도지수는 0.181-0.800으로 나타났으며, E지점과 G지점과의 상관관계에서 가장 높았다. The flora, vegetation structure, distribution of the vascular hydrophytes and hygrophytes were investigated in the nine sites of Goggyochun from April to July in 1999. The flore was composed of 27 families, 68 genera, 83 species, 1 subspecies, 14 varieties and 2 forms. The most frequently ocurring species in the study sites were Panicum dichotomiflorum, ??umex crispus, Arternisia princeps var. orientalis, Humulus japonicus and Digitaria sarguimalis, and among them the ??ersicaria nodosa and Humlus japonicus species were dominants of the communitγ. The ranges of species diversity indices (H') were 0.806-1.148. It was highest in the site E which was the disturbed area. The ranges of equitabilitγ were .504-0.841. The ranges of community similarity indices (CC_s) were 0.181-0.800 among the nine sites, and hiBhest between ite E and site G.

現代思想과 靑年文化 : 哲學的 敎育學的 思想을 中心으로

趙鏞振,徐海吉 충남대학교 미국학연구소 1976 美國學論文集 Vol.1 No.-

Ⅰ. Cultural situations are classified into several parts : traditional culture and alien culture, pure and popular, main stream and non main stream, and finally youth culture. Among other cultures, we can not overlook youth culture, which is closely related to modern culture and civilization. First of all, we must have good knowledge of the youth culture: what it is, how it is composed on what value it is made, what type of thought pattern the modern youth who live in the current technical civilization have My purpose in this paper is to study these problems from the viewpoint of philosophy and education. Ⅱ. If our life is comparable to a tree, the child period is the period of seed growing, the adolescent period is that of blooming in preparation for bearing fruit, and the senescence period is that of bearing fruit ready to fall. The culture formed during the adolescent period has something to do with the establishment fo the co-ordinates of our life. Culture is chiefly formed by what the adolescents think of and what they do during the adolescent period. Ⅲ. The youth culture has at present a seriously significant task of modern thought and humanism, since their resentment, renunciation, resistance, suspense, despair and delinquency are closely related to the social problems. Very tight problems might arouse without the accurate knowledge of the youth culture. The adolescent period is not the transition period but the period when we can from individual views. Ⅳ. Their resistance, secession, irresponsibility, alienation, egoistic mind, enervation etc. have become a challenge against our traditional culture. Therefore we can not bur relate this youth culture with the social problems. Social agreement and open tendency play a significant role in the formation of the youth culture. By means of research on the relationship between the youth culture and the modern thought, that is, between the youth culture and Pragmatism, Instrumentalism, Operationsim, I have attempted to grasp the true character of the youth culture. Ⅴ. I have analyzed complex factors of the youh culture and examined into J. Deway's educational view in addition to T. Brameld's viewpoint. Dewey pointed out the irrationality of their respective viewpoints between traditional education and progressive education and made both the extreme viewpoints harmonized by means of philosophical methods. It is deemed to be a desirable method to tie and harmonize traditional culture and youth culture. According to Dewey, education is the very cultivation of its ability and education is achieved by forming the habit of "Reflective thought" Therefore the forming of "Reflective thought" means tha we can make the adolescent adapted to circumstance and guide them into the right path. Ⅵ. Brameld's reconstructionism is based on the idea that we can not overcome present crisis by means of progressivism and essentialism, but consolidated theory which was adopted from the advantages of both the ideas. The core of Brame;d's thought is the construction of democratic world culture and the realization of social self. As a means of principle to achieve the above, he took social agreement. The social agreement is made by means of social persuation through communication of individual desire. The youth culture must also be assimilated through this method. It is my conviction that Brameld's theory to construct Utopian world is our ultimate educational goal and thought.

상가건물임대차보호법의 문제점

조명래,서해용 건국대학교 사회정책연구소 2003 사회과학연구 Vol.16 No.-

인공토양 생산과 인공지반에 이용방안에 관한 연구

조해용,김진용,김성민 선문대학교 ·중소기업기술지원연구소 2002 선문공대 연구/기술 논문집 Vol.7 No.1

인공토양을 생산하기 위해 점토와 톱밥에 첨가제를 사용하여 혼합한 재료는 화로에서 300~400℃로 약 20분 정도 처리하였다. 인공토양이 인공지반에서 토양의 조건으로 적당한가를 조사하기 위해서 인공토양의 물리·화학적 특성을 분석하였다. 인공토양의 입자크기는 직경 1.5~8㎜ 이었고, 점토토양과 펄라이트A와 비교해서 투수성, 총 질소 그리고 총 인이 높았다. 또한 인공지반의 녹화를 위한 경량토로서 펄라이트를 대신 인공토양을 이용하면 경제적인 효과가 기대된다. For the production of artificial soil, a mixture of clay saw dust as additives was formulated, and was thermally treated in the firing kiln at 300-400℃ for about 20minutes. The physico-chemical characteristics of the artificial soil were analyzed, in order to be used as a soil conditions to the artificial ground. The particle sizes of artificial soil were controlled to 1.5~8㎜ in diameter. Artificial soil showed high in permeablility, total nitrogen and total phosphorous concentration compared to the clay soil and perlite. In addition, artificial soil could be a cost-effective substitute for perlite as a light material for greening of artificial ground.

수생식물을 이용한 수질오염제거에 관한 연구

조해용 선문대학교 2000 공학계열 논총 Vol.3 No.-

갈대, 줄, 미나리 그리고 애기부들의 조사결과는 단위면적당 지상부 최대생산량이 각각 3,257 g/m, 3,077 g/m², 2,550 g/m² 2,483 g/m²으로 순생산량이 매우 높은 것으로 나타났다. 수생식물의 지상부와 지하부의 비를 조사한 자료를 이용하여 계산된 지하부 현존량은 갈대, 애기부들, 줄, 미나리가 각각 8,500 g/m², 1,688 g/m², 917 g/m², 415 g/m²이었다. 갈대, 애기부들, 줄 그리고 미나리 각 기관의 영양염류 함량은 식물의 종류 에 따라 차이가 있었다. 식물의 최대생물량과 그 식물의 지상부 각 기관의 영양염류'함량을 이용하여 계산된 지상부 영양염류 최대현존량은 갈대에서 가장 많은 것으로 나타났다. 지상부와 지하부에 포함되어 있는 영양 염류 최대현존량은 갈대에서 859 kg N/ha, 106,7 kg P/ha, 애기부들에서 758 kg N/ha, 174.4 kg P/ha, 줄에 서 903 kg N/ha, 127.7 kg P/ha, 미나리에서 844 kg N/ha, 116.7 kg P/ha이었다. The maximum above-ground standing biomass in Phragmites communis, Zizania latifolia, Oenanthe javanica and Typha angustata was 3,257 g/m², 3077 g/m², 2,550 g/m², 2,483 g/m² respectively. Below-ground standing biomass was 8,500 g/m², 1,688 g/m², 917 g/m², 415 g/m², respectively. Concentration of nutrients in each organ was different among plant species. Maximum amount of standing nutrients were the highest in reed stand. Amount of maximum standing nutrients are 859 kg N/ha, 106.7 kg P/ha for Phragmites communis, 758 kg N/ha, 174.4 kg P/ha for Typha angustata, 903 kg N/ha, 127.7 kg P/ha for Zizania latifolia and 844 kg N/ha, 116.7 kg P/ha for Oenanthe javanica, respectively.

하천변의 식생분포에 관한 연구 : 곡교천을 사례로 Case Study for Goggyochun

조해용 선문대학교 ·중소기업기술지원연구소 1999 선문공대 연구/기술 논문집 Vol.4 No.1

본 연구는 곡교천 주변 식물들의 분포구조를 조사하고 식물분포와 환경요인과의 상호관계를 조사하였다 1998년 8월부터 10월까지 총 11개 조사지점을 곡교천을 따라 선정하여 식물분포구조와 토양환경요인들을 결정하였다 습지식물들이 44종으로 구성되었다 조사지점에서 가장 빈번하게 채취된 종들은 미국개기장, 소리쟁이, 쑥, 환삼덩굴 그리고 바램이였다 그 중 큰개여뀌와 환삼덩굴종이 군집내에서 우점종으로 나타났다 토양분석결과 유기물의 함량과 점토의 성분이 상류지역에서 높고 반면 모래의 성분은 하류지역에서 높게 나타났다 This study was conducted to investigate the distribution pattern of plants on streamside of Goggyochun, and to determine the relationships between plant distribution and environmental factors A total of 1 1 survey sites were selected along the Goggyochun during the period of between August and October 1998, and vegetation distribution pattern and soil environmental factors were determined The wet land plants were composed of 44 species The most frequently occurring species in the study sites were Panicum dichotomiflorum, Rumex crispus, Arternisia princeps var orientalis, Humulus japonicus and Digitaria sarguimalis, and among them the persicaria nodosa and Humlus japonicus species were dominants of the community. Analysis of soil properties showed that organic matter and clay content were higher in the upstream region while sand content was higher in the downstream region.

한국의 환경영향평가제도에 있어서 실효성 확보 방안 : 한국과 독일 환경영향평가의 비교, 분석

조해용 선문대학교 첨단과학기술연구소 1996 첨단과학기술연구소 논문집 Vol.1 No.1

현재 지구가 당면하고 있는 환경문제를 해결하기 위해 사후 대책관리로부터 사전 예방관리로의 전환 필요성이 국제적으로 대두되고 있다. 1992년 유엔환경개발회의에서 "환경적으로 건전하고 지속 가능한 발전"을 달성하기 위한 제도적 장치로서 환경영향평가의 중요성이 강조되었을 뿐만 아니라 각국별로 모든 개발사업에 대하여 환경영향평가를 실시하는 것을 의무화하도록 규정하고 있다. 우리 나라의 경우 1977년 환경영향평가제도를 도입후 개발에 따르는 환경에의 영향을 사전에 고려함으로써 환경훼손의 예방에 기여한 바는 적지 않지만 아직도 개발사업의 면죄부라는 비난을 받고 있다. 그 동안 실행과정에서 환경영향평가제도에 대한 수정, 보완 등으로 많은 점들을 개선하였지만 아직도 우리 나라 환경영향평가제도에 있어서의 문제점은 절차적인 측면, 내용적인 측면, 그리고 방법론적인 측면등 매우 다양한 분야에 걸쳐 산재해 있는 것으로 지적되고 있다. 본 연구는 한국과 독일 환경영향평가제도의 비교, 분석을 통하여 우리 나라 환경영향평가제도에 있어서의 문제점을 지적하고, 그 개선방안을 모색하여 효과적인 환경보전에 기여하는 제도로써 정착 발전하는데 그 목적을 두고 있다. A problem consciousness is emerging internationally that the current remedial approach to solve global environmental problems should be changed to a preventive approach. In the 1992 United Nations Conference on Environment and Development, the importance of environmental impact assessment as an institutional system to achieve environmentally sound and sustainable development was emphasized. In addition, it was suggested that the government of each nation should reqire to assess the environmental impact of every developmental project beforehand. Environmental impact assessment has been implemented since the year 1977 in Korea. Although it is recognized the system has contributed greatly toward preventing environmental destruction by estimating the impact of development on environment in advance, there also have been criticism that it sometimes works as indulgence for developmental projects. The system has been improved through considerable modifications and revisions, but there still are many problems in the system in terms of procedures, contents, and methodoloy. The purpose of this study is to explore how to improve the Korean system of environmental impact assessment so that the system can contribute effectively to environmental protection. This study will point out problems of the current Korean system and suggest ways to resolve the problems, through a comparative analysis of Korean and german systems.

이동 열원을 고려한 전자빔 용접의 유한요소해석

조해용,정석영,김명한,조창용,이제훈,서정 한국레이저가공학회 2001 한국레이저가공학회지 Vol.4 No.1

Simulation on the electron beam welding of Al 2219 alloy was carried out by using commercial FEM code MARC, which encounters moving heat sources. Due to axisymmetry of geometry, a half of the cylinder was simulated. A coupled thermo-mechanical analysis was carried out and subroutine for heat flux was substituted in the program. The material properties such as specific heat, heat transfer coefficient and thermal expansion coefficient were given as a function of temperature and the latent heat associated with a given temperature range is considered. As a result, the proper beam power is 60kVX60mA and welding speed is 1~1.5 m/min. The residual stress in the heat-affected zone as well as the fusion zone does not increase. It is necessary to use jigs for preventing distortion of cylinder and improving weld quality.