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하성규,이영우,김영호,Ha, Seong-Gyu,Lee, Yeong-U,Kim, Yeong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.8
Effective material properties of active fiber composites with interdigitated electrodes are derived as a function of the fiber volume fraction. For the purpose of applying the rule of mixture, three unit cell models are introduced; each for the deformation and stress continuities in the out of plane and in-plane directions, and the continuity of the electrical displacement in the longitudinal direction. Derived effective material properties are compared with the results by the finite element method; good agreements are observed between them. As an application, the electromechanical behavior of the angle ply laminates with the active fiber layers bonded on the top and bottom surfaces are investigated; the angle of piezoelectric fiber to maximize the twisting curvature is obtained using the present model.
하성규,Ha, Seong-Gyu 에너지절약전문기업협회 2009 esco Vol.56 No.-
지금까지 인류가 창안해 낸 가장 훌륭한 대안적 개발 패러다임은 '지속가능한 개발'이라 할 수 있다. 어젠다21(Agenda 21) 등 국제기구에서 논의되는 지속가능한 개발의 개념은 '미래 세대의 욕구를 충족시킬 수 있는 환경과 여건을 저해하지 않으면서 현 세대의 욕구를 충족시키는 개발'이다. 그리고 이 지속가능한 개발은 세 가지 핵심적 요소를 포함하고 있는바 이는 환경적 가치, 미래 지향성, 그리고 형평성이다. 이와 관련한 지속가능한 도시개발에 대해 알아보자.
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하성규,조영수,Ha, Seong-Gyu,Jo, Yeong-Su 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
A method is proposed to predict the deformed shape of the structure subjected to the unknown external loads using the signal from the piezoceramic sensors. Such a shape estimation is based on the linear relationship between the deformation of structure and the signal from sensor, which is calculated using finite element method. The deformed shape is, then calculated using the linear matrix and the signals from the piezoceramic sensors attached to the structures. For the purpose, a structural analysis program is developed using a multi-layerd finite element of 8 nodes with 3 displacement and one voltage degrees of freedom at each node. The multiple layers with the different material properties can be layered within the element. The incompatible mode with the element is found to be crucial to catch the bending behavior accurately. The accuracy of the program is, then, verified by being compared with the experimental results performed by Crawley. The proposed shape estimation method is also verified for the different loads and sensor size. It is shown that the results of shape estimation method using the linear matrix well predicts the deflections compared with those of finite element method.
하성규 ( Ha Seong Gyu ) 한국지역개발학회 2003 韓國地域開發學會誌 Vol.15 No.4
How is housing produced and then distributed to people of different income, race, and class? There are two alternative perspectives. The first looks at the distribution or allocation of housing as a process of exchange operating primarily through the mechanism of price. The second looks to the role of government in producing and allocating housing based on primarily social needs. Under the new liberalism way of housing policy since the early 1980s, state intervention was portrayed as a bad thing and the unregulated operation of markets a good thing. Whatever its ideology or form of government, each society must have some mechanism for allocating investment to housing and then for allocating housing to its population. The aim of this paper is to review of alternative types of housing systems and degrees of government involvement. The state and the market were projected as antagonistic poles. Nevertheless, the important point to remember is that there are no pure models of either state-controlled or market-based systems. Korea`s housing polices reflect all combination from centrally-planned housing programs to those more new liberalism approaches based on the private market.