• Journal of Korean Medical Ki-Gong Academy
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• v.5 no.1
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• pp.260-283
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• 2001

• Journal of Korean Society of Steel Construction
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• v.13 no.4
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• pp.337-349
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• 2001

This study present an optimum deck and girder system design for minimizing the life-cycle cost (LCC) of orthotropic steel deck bridges. The problem of optimum LCC design of orthotropic steel deck bridges is formulated as that of minimization of the expected total LCC that consists of initial cost, maintenance cost, expected retrofit costs for strength, deflection, and fatigue. To demonstrate the effect of LCC optimum design of orthotropic steel deck bridges, the proposed optimum LCC design is compared with the conventional method for orthotropic steel deck bridges design. From the numerical investigations, it may be positively stated that the proposed optimum design procedure for orthotropic steel deck bridges based on the LCC will lead to more rational, economical and safer design.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.17 no.1
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• pp.11-20
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• 2004

The main goal of this study is to develop MATLAB programming for an analysis of distortional deformations and stresses of the straight box girder. For this purpose, a distortional deformation theory is firstly summarized and then a BEF (Beam on Elastic Foundation) theory is presented using analogy of the corresponding variables. Finally, with governing equations of the beam-column element on elastic foundation, an exact element stiffness matrix of the beam element and nodal forces equivalent to concentrated and distributed loads are evaluated via a generalized linear eigenvalue problem. In order to verify the efficiency and accuracy of this method, distortional stresses of box girders with multiple diaphragms are presented and compared with results by FEA.

• (The)Study of the Eastern Classic
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• no.33
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• pp.97-129
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• 2008

Sin-jeokdo (Hogye, 1574-1663) was a general of patriotic army who protected the region of Euseong at the time of Qing dynasty's invasion in 1627(Jungmyo) and 1636(Byongja). He was an prominent figure outside government as well as a faithful confucian who spent his life with reading and teaching junior scholars after disgraceful treaty in the year of Byongja. Hogye understood the neo-Confucianism in terms of the whole duty of men(綱常) and righteousness(義理) which was in the status of sole official academic subject and thought its practice only hinged upon the practice of filial piety and brotherly love together with loyalty and sincerity based on morals between sovereign and subject, father and son. He, therefore, emphasized that the righteousness only can be accomplished by dying of children and subjects for filial piety and fidelity respectively, at the time of commotion. This was his spirit of righteousness which repelled Japanese army in the Imjin War and he insisted on defeating Japanese army in accordance with this spirit. Hogye's practice of righteousness is grounded on the spirit of Chosun Confucianism which stressed actual practices of moral principles and duties. His practice of righteousness shows internalized cultural sinocentrism and moral-centric, ethic-centric characteristic of Chosun Confucianism. Moreover, the moral consciousness which was shown in Hogye's thought helped to keep Korean's pride and observe morality and it served itself as a basis of commencement of nationalistic military, religious movements afterwards.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.307-308
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.187-188
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• 2013

• Magazine of the Korea Concrete Institute
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• v.5 no.3
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• pp.125-132
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• 1993

콘크리트의 인성개선을 위하여 횡보강근을 사용할 수 있으나 보통강도으 철근ㅇ르 사용하였을 경우에는 조속한 철근의 강상으로 인한 콘크리트으 인성개선효과가 급격히 떨어지기 때문에 고강도 횡보강도에 의한 압축인성 개선효과를 이론 및 실험으로 고찰하였다. 실험결과 각 공시체의 변형능력을 비교해 보면 보통강도근의 경우 콘크리트 응력블록계수가 최대일 때 콘크리트의 압축단 변형도가 1%내외인데 비하여 고강도근으로 횡보강하였을 경우가 콘크리트의 압축변형도는 2%로서 충분한 휨압축 인성개선용으로 콘크리트의 충분한 인성개선이 가능하다고 볼 수 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.389-390
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.237-237
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• 2004

최근 산업의 급속한 발전과 가공기계의 초정밀화로 인한 초정밀가공품의 수요가 꾸준한 증가를 보이고 있으며, 특히 렌즈 산업에서 초정밀가공기술의 적용이 급속히 증가되고 있는 추세이다. 초정밀가공에서는 공구의 가공물on 대한 상대운동이 그대로 가공물에 전사되므로 생성되는 가공데이터의 정확도가 중요하다. 고정도의 렌즈와 렌즈금형들은 형상정밀도가 수십 나노미터에 이르는 초정밀 제품으로써 가격이 고가이다. 따라서 잘못 생성된 공구 경로는 시간적인 손실뿐만 아니라 고가의 장비를 훼손시킬 수 있으므로 공구경로 보정을 행할 필요가 있다.(중략)

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2001.10a
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• pp.227-234
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• 2001

The lifting and lowering supports method was recently developed in steel box girder bridge. It has many advantages by lifting and lowering of inner supports and filled concrete. This method reduces an amount of steel and height of girders. It is one of the methods used to effectively increase the use of structural material. However, if there is too much lifting of inner supports, it is possible to cause buckling of the compression flange or web panel. Therefore it needs a proper number of longitudinal and transvers stiffener.