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하재경,김형훈,김형동 한국전자파학회 1998 한국전자파학회논문지 Vol.9 No.5
본 논문에서는 PCB (printed circuit board) 접지면에 셜치된 캡(gap)이 불요전자파 방사에 미치는 영향을 정 량적으로 해석하였다. 본 연구의 해석법으로 복잡한 구조체의 전자기적 특성을 해석하는데 주파수영역 전자파 수치해석 방법들과 비교하여 여러 가지 장점올 가지는 시간영역 해석법인 FDTD(finite difference time dom main) 방법올 사용하였다. 해석 구조체는 일반적으로 생산되는 PCB와 유사한 크기를 선정하였으며 소자충은 전압원과 마이크로스트립만이 폰재하는 단순화된 구조이다. PCB 접지변에 설치된 캡에 의해 생기는 인덕턴스 의 크기와 입출력 케이블올 통한 불요전자파 방사량을 FCC 및 CISPR 규정치와 함께 제시하였으며 갱의 크기 에 따라 방사되는 불요전자파의 세기가 크게 변화되는 것을 관찰할 수 있다. 본 논문의 해석결과는 실제 PCB 셜 계에 있어서 잘봇된 캡의 설치로 인한 불요전자파 방사를 막는데 유용하게 사용될 수 있으리라 생각된다. In this paper, the effect of the gap in the ground plane on the electromagnetic interference (EMI) is analyzed quantitatively. Because of a lot of advantages compared to other numerical techniques, the FDTD (finite difference time domain) is applied to the EMI effect modeling. The analyzed model is the simplified PCB (printed circuit board) which has a microstrip and ground plane. The inductance induced by the gap is modeled and calculated by gridding the whole PCB based on the FDTD algorithm. When external cables are attached to the PCB, the common-mode current is induced along the attached cable and the resulting electric field strength is calculated and presented along with the FCC and CISPR EMI limits. The results show that the radiated field strength highly depends on the size of the ground plane gap. The numerical simulation results can be used as a reference in the practical PCB design with the ground plane gap.
A Comparative Study on Korean and Chinese Traditional Furniture based on the Life Style
하재경,홍승대,Ha, Jae-Kyung,Hong, Sung-De Korean Digital Architecture-Interior Association 2006 한국디지털건축인테리어학회 논문집 Vol.6 No.1
Korea and China have had close relations not only geographically but also ideally and culturally throughout history. Regarding their lifestyles on housing patterns, however, Koreans had a sedentary way of life, usually sitting on the floor while Chinese had a standing lifestyle, sitting on a chair. This paper tries to have a comparative analysis on similarities and distinctions of two countries' traditional furniture that had complied with each lifestyle. This paper also aims to explore the similarities and distinctions of the form and function of the traditional furniture of the two countries and then to put results of this paper in design and plan of modern furniture and housing in our times. The study can be summarized as follows. Even if, cultural and historical relationships of two countries, there is a different of traditional furniture's forms and types. The major differences are as following : Korean furniture is predominantly on the floor level with storing furniture while Chinese one is intermixed with seat-level and floor level styles. These characters seem to be derived from their own housing and life style. In Ming and Qing period China, Their developed in which intermediate people and building. But, in Korea their housing style had floating floor against wet earth, which finished woods, Ondol. Because of these finishing, the Korean traditional furniture was developed into a good form and a suitable dimension for moving. These differences in furnishing style seemed to well reflect building and housing style of each country. And Image map and positioning map can show the differences in a whole aspect.
FDTD 방법에 의한 PCB 접지면 Gap의 임피던스 해석
하재경,김형동,장호성 에스케이텔레콤 (주) 1997 Telecommunications Review Vol.7 No.6
본 연구에서는 PCB(Printed Circuit Board) 접지면에 설치된 갭이 불요전자파 방사에 미치는 영향을 해석한 연구로서 시간영역 유한차분법(FDTD)을 사용하여 접지면의 임피던스를 해석하였다. 먼저 PCB에서의 불요전자파 방사 메카니즘을 설명하고 접지면의 임피던스 해석을 위한 FDTD(Finite-Difference Time Domain) 모델링 방법을 제시한다. 갭의위치에 따른 PCB 접지면의 임피던스 증가를 계산하였으며 그 결과 갭의 위치에 따라 수 nH까지 임피던스가 증가함을 관찰하였다. 본 연구결과는 고속 전자제품 설계시 PCB에 의한 불요전자파 방사를 줄이는데 응용될 수 있을 것이다.
인공 심박동기 유도(Pacemaker Lead)에 의한 감염성 심내막염 1례
하재경,김상현,김성호,안병재,전국진,홍택종,신영우,정성운,김종원 한국심초음파학회 2001 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.9 No.1
The infected endocarditis related permanent pacemaker occurs rare and most of them occur at generator pocket but endocarditis related permanant pacemaker lead itself occurs very rarely. The rate of infection after pacemaker implantation is reported as 0.13-7% or 0.13-19.9% and mortality rate is up to 24-33%. Focal inflammation of generator pocket is easily detected but it is difficult to diagnose endocarditis related pacemaker lead and it has poor prognosis. Especially, early diagnosis is most important because endocarditis related pacemaker is fatal. Thirteen years ago, a womon was inserted the permanent pacemaker and then only generator was removed after one month. We report a case that we had removed the pacemaker lead by open thoracostomy and cardiopulmonary circulation to treat endocarditis related pacemaker lead.
유니버셜 디자인 측면에서 공공 공간의 환경평가와 개선방안 -안산시 공공기관을 중심으로-
하재경,김양희 한국디지털건축·인테리어학회 2009 한국디지털건축인테리어학회 논문집 Vol.9 No.1
Recently, the public offices are going to be an important role of CIP(City Identity Program) and be a center of citizen's community activities. So, the aspect of the universal design (UD), the space performance assessment for a disable user is invaluable to designing the public office spaces. Purpose of this paper is to provide basic data for better design of public office space based on UD(universal design) principle. Conclusion based on the finding are as follows; First, checklist of environmental assessment for public space was composed of 7 basic principles of UD and 3 additional principles(aesthetic appreciation, maintenance and eco-design). Second, as the result of assessment, accessible and inclusive design is more necessary. Third, local characteristics should be developed and managed deliberately as to public space design. As the result of that, public office space design should an important part of reducing the isolation that was caused by physical and social disability. From now on, in public office space design, the integrated and continuous design program that is based on UD principle and eco-design will be necessary.
성 인지적 관점에서 도시의 여성친화도 평가에 관한 연구 -안산시 공공디자인 정책사례를 중심으로-
하재경 한국디지털건축·인테리어학회 2011 한국디지털건축인테리어학회 논문집 Vol.11 No.2
As the city have been enlarged bigger and more complicated recently, a discussion about a city right, started on the base of perception that a city must be recognized as a public resource and the value. A city rights imply equal use and participation in these city resource. From a start of modern city, a city space have been developed mainly, as a man's economic business and industrial area, but now, to ensure a woman's city right is getting an important factor of citizen's settlement. Then many domestic cities tries to promote a woman friendly city creation. The main purpose of this paper is to find the concept of woman friendly city, based on a gender-sensitive perspective view point and to make an assessment index of Woman Friendliness of the City (WFC). In a case of Ansan City which city is in the planning stage of application for a woman friendly city.
한.중.일 전통 수납류가구의 유사성과 상이성에 관한 비교 연구
하재경,Ha, Jae-Kyung 한국디지털건축·인테리어학회 2007 한국디지털건축인테리어학회 논문집 Vol.7 No.1
Purpose of this paper is find the similarity and dissimilarity of Korean, Chinese and Japanese traditional furnitures for storage. Also this paper tries to have a comparative analysis on life style, characteristics of housing space and furniture's form of three countries. The study can be summarized as follows. First, space scale and seat levels of three countries are related to furniture's height and form, so that Chinese furniture have over scale than human, and Japanese furniture have the type of box for stacking. Second, the way of heating and materials of floors are concerned with the type of furniture's legs. Third, even if these dissimilarities, the aesthetic characteristics of three countries furniture would be a data base for making design identity of East Asian modern housing furniture.