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이헌기,정봉부,김동섭,박현철 한국정밀공학회 2011 International Journal of Precision Engineering and Vol.12 No.5
A modified strain gradient theory is proposed based on the nonhomogeneity of polycrystalline metallic materials. Geometrically necessary dislocations are generated on the slip planes as well as on the grain boundary to accommodate deformation with minimum internal stress. Since amount of the geometrically necessary dislocation depends on the deformation shape, specimen size and grain size, it is an important factor for the modified strain gradient theory and the size effect. This new theory differs from the mechanism based strain gradient plasticity in its consideration of the geometrically necessary dislocations on the grain boundary and free surface effect. This theory provides a possible explanation for conflicting size effect: the smaller can be either harder or softer due to the deformation. Using the proposed theory, analysis of the effect of both specimen and grain size under the plane bulge test of polycrystalline materials is performed.
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李憲琦 단국대학교 대학원 1980 學術論叢 Vol.4 No.-
The purpose of this study is to secure stabilization of industrial relations, to prevent and settle labour disputes so as to bring about and maintain peace in industrial society, and thus to facilitate development of national economy. The first part of this study was designed to analyze briefly character of industrial relation and aspect of labour disputes that took place since the period from 1920 under the peculiar conditions of colonial domination of the country by Japan up to date in beginning of 1980. In the last part, it made also some countermeasures to the labour policy to solve labour disputes and to set up cooperation system of industrial society in korea. There were many labour disputes to reject foreign capital and resist Japanese Imperialists during the period of domination of the country by Japan. Labour movement was forcibly suppressed by the Japanese Imperialists and wage-deduction owing to depression, overtime employment, discriminatory treatment of korean workers often cause collective disputes. after 1945, the communist-led trade union (CHUN PAENG) went on general strkes on march and september for political and economic confusion, but free democratic trade union (FKTU) challenged the leftist and positively protected wokers and industries. In 1960's, the nation's political and social environment changed sharply, ruslting increasing control on the economic function of trade unions, wokers are restricted in their two of fundamental rights. Even though the right of collective bargaining and collective action have been limited, The annual number of labor disputes statistically is increacing. There are many causes that a considerable number of workers still are plagued by low wages, long working hours and poor welfare facilities, and also there is no systematic cooperation and effective procedures of settlement of labor disputes. Consequently, the trade union function has become one of submitting pettions and recommedations without effective means to support its views. Despite union membership continues to grow, cohesiveness and independence seems to be increasingly lacking. It becomes more difficult for the unions to forge a strong link and to demand, with hope of success, better wages or improved working conditions. In crder to prevent conflict between the parties of labour relations, it is basic conditions to ensure a balance of power among the factors of industrial relations and to improve labor-management Cooperation system, and thus to facilitate the development of national economy. In the view of growing government influence on labour-management relations, and impending implementation of various economic and social security policies, the labor economic policy should be changed improving the structure of income distribution and social welfare system, administration of labour affairs should be strengthened as a Ministry from government agency dealing with labour matters. In respect to the cooperation system between labor and management, it is nacessary to enact special law of labour-management councils Just as joint Consultations system from the article 6 of labour union law and the minimum wage law for elimination of the lowest wages fields. It is anticipated that labour disputes will increase in the future in pace with econmic growth and such disputes are inimical to the interests of all parties of industrial relation: employees, employers, government and society itself. With changes in the political system of korea in 1980, a new phase in industrial relations should be started from a long-range point of view instead of short-sighted policy for new developments in industrial relations.
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이헌기 ( Hun Ki Lee ) 한국보건사회연구원 1985 保健社會硏究 Vol.5 No.1
We would affirm that modernization of society is necessarily accompanied by population changes, and at the other hand, the countermeasures to the anticipated problems caused by the population changes have to be taken. Efforts for the control of population growth made during the last 20 years are expected to maintain a stable population in future, and we hope these changes will be attained within the earlier period. Now is the moment that we cannot limit our concern to the population growth control, rather we have to consider the social welfare task in the aspect of population stability. It is not because population changes set limits to artificial control, but because the order of population changes presents a desirable sign for low fertility, and further important thing is, we have to pay attention to how to make human beings already born as well as to be born in future enjoy their quality of life. Needless to say, socio-economic stability requires economic stabilization to meet basic essential needs. However supposing this. social welfare tasks shall be different in their pattern depending upon population changes. In other words, since quantitative growth of population has a close relationship with social. economic and environmental conditions and cause increase of basic demands for human survival or deterioration of life environment, a stable population shall be quickly attained. Changes in population structure, along with the quantitative growth of population make changes in patterns of social welfare demands. While the pyramid type of population structure becomes changed to the bell or pot type of population structure, changes in education and employment as well as changes in problems of the aged and medical demands must be made. On the other hand, population changes accompany the value changes in the process of modernization of society. This multiple social changes bring about a value of individualism and a nuclear family norm, and a enlargement of women`s social participation which, in turn, cause the in- and out-family problems. At the same time, social deviator and failures must be increased in the industrial society, and thus, countermeasures in the aspect of welfare have to be taken. In this respect, the base of social welfare for meeting basic demands have to be formed not in the past narrow sense, but in the long- range and multi-sided aspects.
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이헌기(Hun-Kee Lee),박명철(Myeong-Chul Park) 한국컴퓨터정보학회 2021 한국컴퓨터정보학회 학술발표논문집 Vol.29 No.2
농업용 전기차는 일반 전기차에 비해 경량성 및 연료의 효율성이 매우 중요하다. 또한, 충돌에 대비한 재질의 강도적인 측면에서 다소 자유로움을 가진다. 본 연구에서는 레이저 가공, 절곡, 도장 등의 복잡한 절차를 통한 가공 공정을 대체하여 생산의 효율성을 극대화할 수 있는 진공성형을 위한 전기차 전면부 3차원 설계 방법을 제안한다. 보닛 및 휀더의 3차원 설계 및 진공성형 금형 기술 개발을 통하여 제품의 안정성과생산성 및 편의성을 향상시키는 것이 연구의 주요 목적이다. 주요 연구 절차는 CATIA를 이용한 설계 결과물을 바탕으로 ABAQUS를 이용한 구조해석을 통해 안정성을 확인하고 3D Scanner를 이용하여 시제품의 치수 확인을 통한 실효성을 검증한다. 본 연구의 결과물은 농업용 전기차 주 고객층인 고령자 및 여성 농업종사자들에게 널리 사용될 수 있을 것으로 사료된다.
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