지속 가능한 도시개발

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.

금속라이너 - 복합재 적층 압력 용기의 최적설계

하성규,이동건 ( Sung Kyu Ha,Dong Gun Yi ) 한국복합재료학회 1997 Composites research Vol.10 No.1

복합재료 지능구조물의 제어를 위한 압전소자를 이용한 변형형상예측

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.

부분 장골과 장요추 인대를 포함한 요추 천추골의 유한 요소 모델링 및 비선형 해석

하성규,임종완,Ha, S.K.,Lim, J.W. 대한의용생체공학회 2007 의공학회지 Vol.28 No.3

Owing to needs of biomechanical comprehension and analysis to obtain various medical treatment designs which are related with the spine in order to cure and diagnose LBP patients, the FE modeling and nonlinear analysis of lumbosacrum including a partial ilium and iliolumbar ligaments, were carried out. First, we investigated whether the geometrical configuration of vertebrae displayed by DICOM slice files is regular and normal condition. After constructing spinal vertebrae including a partial ilium, a sacrum and five lumbars (from L1 to L5)with anatomical shape reconstructed using softwares such as image modeler and CAD modeler, we added iliolumbar ligaments, lumbar ligaments, discs and facet joints, etc.. And also, we assigned material property and discretized the model using proper finite element types, thus it was completely modeled through the above procedure. For the verification of each segment, average sagittal ROM, average coronal ROM and average transversal ROM under various loading conditions(${\pm}10Nm$), average vertical displacement under compression(400N), ALL(Anterior Longitudinal Ligament) and PLL(Posterior Longitudinal Ligament) force at L12 level, strains of seven ligaments on sagittal plane at L45 level and maximal strain of disc fibers according to various loading conditions at L45 level, etc., they were compared with experimental results. For the verification of multilevel-lumbosacrum spine including partial ilium and iliolumbar ligaments, the cases with and without iliolumbar ligaments were compared with ROM of experiment. The results were obtained from analysis of the verified FE model as follows: I) Iliolumbar ligaments played a stabilizing role as mainly posterior iliolumbar ligaments under flexion and as both posterior and anterior iliolumbar ligaments of one side under lateral bending. 2) The iliolumbar ligaments decreased total ROM of 1-8% in total model according to various motion conditions, which changed facet contact forces of L5S level by approximately 0.8-1.4 times and disc forces of L5S level by approximately 0.8-1.5 times more than casewithout ilioligaments, under various loading conditions. 3) The force of lower discs such as L45 and L5S was bigger than upper discs under flexion, left and right bending and left and right twisting, except extension. 4) It was predicted that strains of posterior ligaments among iliolumbar ligaments would produce the maximum 16% under flexion and the maximum 10% under twisting. 5) It's expected that this present model applies to the development and design of artificial disc, since it was comparatively in agreement with the experimental datum.

능동 화이버 복합재의 모델링 및 적용 연구

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.

공동주택관리의 의미와 중요성

하성규,Ha, Seong-Gyu 한국주거학회 2014 住居 Vol.9 No.2

21세기를 대비한 지속가능한 지역개발전략연구

하성규,김재익,전명진,문태훈 ( Seong Kyu Ha,Jae Ik Kim,Myung Jin Jun,Tae Hoon Moon ) 한국지방자치학회 1997 한국지방자치학회보 Vol.9 No.2

This study aims at developing strategies for sustainable regional development. Specifically, primary concern is given to four sectors including environment, regional economy, hosing, and land use and transportaion in suggesting sustainable developement strategies. A variety of strategies for each sector in regional planning have been suggested. However, several types of conflicts take place among strategies, sectors, people, and even generations in implemeting sustainable regional development strategies. This paper introduced Campbell`s (1996) notion of `planner`s triangle` which explains conflict structure among regional planning goals such as economic efficiency, environmental protection, and social equity in achieving sustainability. This paper concludes that sustainable development cannot be accomplished directly, rather approximately and indirectly through confronting and resolving the conflicts. It also concludes that the role of regional planners for sustainable development is crucial as negotiatiors resolving conflicts as well as creators innovating new strategies for sustainable development.

주민의 지역사회활동 참여특성에 관한 연구

하성규,김재익,구본영 ( Seong Kyu Ha,Jae Ik Kim,Bon Young Koo ) 한국지방자치학회 1995 한국지방자치학회보 Vol.7 No.1

도시재생의 길

하성규,Ha, Seong-Gyu 한국주택협회 2007 주택과 사람들 Vol.205 No.-

국민임대주택건설사업의 공공부문간 갈등유형 및 갈등관리 방안

하성규(Ha, Seong-Kyu),김성연(Kim, Seong-Yeun) 한국지역개발학회 2007 韓國地域開發學會誌 Vol.19 No.3

The purpose of this paper is to examine conflicts between public parties in public rented housing programs. The Korean government has implemented one million rental housing program to solve low-income housing problems since 2003. A clash of interests, values, actions or directions often sparks a conflict. One should not confuse the distinction between the presence and absence of conflict with the difference between competition and co-operation. In competitive situations, the two or more parties each have mutually inconsistent goals, so that when either partty tries to reach their goal it will undermine the attempts of the other to reach theirs. The main causes of conflicts between public agencies are due to the unreality of schedule, shortage of fiancing, unclear shared responsibility. We try to examine conflict management in the case of public rental housing program through the concept of governance. We do believe that the concept of ‘governance’ should be applied to solve the problems of conflicts. A fair governance implies that mechanisms function in a way that allows the agents to respect the rights and interests of the stakeholders, in a spirit of democracy. It has also been used to describe the "proper functioning of institutions and their acceptance by the public". And it has been used to invoke the efficacy of government and the achievement of consensus by democratic means (participation).