공동주택관리의 의미와 중요성

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

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.

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.

금속라이너 - 복합재 적층 압력 용기의 최적설계

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

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.

도시재생의 길

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

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.

당뇨병성 신병증의 역학과 임상경과 제1형 및 제2형 당뇨병 사이에 신병증의 유병률 및 발생률의 차이가 있는가?

하성규 ( Sung Kyu Ha ) 대한신장학회 2005 Kidney Research and Clinical Practice Vol.24 No.6

하이브리드 복합재 플라이휠 로터에 작용하는 내압의 효과

하성규 ( Sung Kyu Ha ),오제훈 ( Je Hoon Oh ),한상철 ( Sang Chul Han ),김명훈 ( Myung Hoon Kim ) 한국복합재료학회 2005 Composites research Vol.18 No.1

공공임대주택과 사회적 배제에 관한 연구

하성규(Seong-Kyu Ha),서종녀(Jong Nyeo Seo) 한국주택학회 2006 주택연구 Vol.14 No.3

  우리나라 공공주택정책에 있어 사회적 배제 문제는 최근에 와서 관심의 대상이 되고 있다. 본 연구의 목적은 공공임대주택 주민과 인근 분양주택 주민 간에 야기되는 사회적 배제 현상에 대한 주민 의식(인식정도)을 파악하고 사회적 배제가 주거만족도에 어떤 관련성이 있는지를 분석하고자 한다. 아울러 사회적 배제를 최소화할 수 있는 방안이 무엇인지를 모색하고자 한다. 이를 위해 영구임대주택 주민과 영구임대주택 인근 분양주택 주민을 대상으로 설문조사를 실시하였으며, 분석방법은 일원분산분석, 상관관계분석, 그리고 경로분석 등을 사용하였다. 분석 결과 첫째, 주거지 차별에 대한 의식은 영구임대주택만 공급된 단지, 월평균 소득이 낮은 분양주택 주민에서 상대적으로 높게 나타났다. 그리고 단지내 이웃간 갈등이 많고 영구임대주택의 부정적 요소 및 이미지가 나쁠수록 주거지 차별은 강하게 나타났다. 교육적 차별은 교육수준이 초/중학교 졸업자에서 나타났고 단지내 이웃간 갈등이 많으며 영구임대주택의 부정적 요소 및 이미지가 나쁠수록 나타났다. 둘째, 주거만족도는 사회적 배제와 인과관계를 형성하고 있었으며, 특히 주거지 차별이 직접적으로 주거만족도에 영향을 미쳤다. 반면 교육적 차별은 주거 만족도에 직접적인 인과관계는 없었지만 주거지 차별을 통해 간접적인 인과관계를 나타냈다. 사회적 배제는 영구임대주택 주민이 인식하는 것뿐만 아니라 인근 분양주택 주민 중에서 교육적 약자(초/중학교 졸업)와 경제적 약자(분양주택 거주자 중에서 월평균 소득이 70만원 이하)의 경우 느끼고 있었다. 가난한 사람과 중산층 주민이 함께 어울려 살아가는 계층간 혼합(social mixing)은 중요한 정책이슈로 부상하고 있다. 교육적 차별 등의 사회적 배제를 예방하고 주거만족도를 높이기 위한 방안으로 사회적 자본을 증대하는 방안이 강구될 필요가 있다. 아울러 파트너십(주민, NGO, CBO, 정부 등)의 구축 등을 통한 사회적 네트워크 형성이 매우 중요한 것으로 판단된다.   Social exclusion is a relatively new term in Korean housing policy - not only referring to poverty and low income but some of their wider causes and consequences, particularly in public rental housing estates. The purpose of this paper is to examine social exclusion phenomena between public rental housing estates and neighboring non-public housing residents. And we try to analyse the relationship between social exclusion and residential satisfaction/dissatisfaction. In order to explore the problems of social exclusion, a survey of the public and non-public housing communities was conducted by means of interview with household heads and field surveys. One of most crucial findings is that public housing residents and low income groups in neighboring non-public housing have strong feeling of social exclusion. The feeling of residential segregation and discrimination were the most direct factors of residential satisfaction/dissatisfaction to the public housing residents and low income residents in non-public housing estates. The number of households who answered negatively is much higher than those who answered positively in terms of social mixing. In order to tackle these kinds of problems, the government has to make a new approach to minimize the problems of social mix within the same community(estates). Partnership-based approaches (NGO, governments, etc.) should be advocated as a way of promoting social capital. Social networks are also important as an asset that poor people in cities can exploit to advance themselves or, in times of adversity, use to help dampen the effects of poverty.