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FEM 및 FVM solver 결합 이용에 대한 파일 I/O 의 영향
고원진 ( Won-jin Ko ),이기택 ( Ki-taek Lee ),유지형 ( Ji-hyung Yoo ),정형수 ( Hyung-soo Jung ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2
전기 자동차 에너지 시스템을 개발하기 위해서는 열 유체-전자기장 연성해석이 필요하다. 이를 위해 열 유체와 전자 기장 각각의 해석에 특화된 패키지들을 사용하고, 이 패키지의 실험 결과를 저장 장치를 통해 주고받는다. 하지만 이는 저장장치 I/O 횟수를 늘려서 전체 계산 과정을 느리게 만들 수 있다. 데이터 교환을 MPI 패키지를 이용하여 DRAM 을 통해 이루어지도록 만들 수 있지만, 이는 계산 결과의 지속성을 악화시킨다. 즉, 열 유체 및 전자기장 연산과정에서 속도와 결과의 지속성은 상충적인 관계 갖는다. 본 연구는 이러한 관계를 실험적으로 분석하고 데이터의 지속성을 완화했을 때 이에 의해 얻을 수 있는 성능 이익을 분석한다.
GIC 적용 대역통과필터를 이용한 컴퓨터 부하의 직렬 아크고장 전류 우수고조파 분석
고원식(Won-Sik Ko),문원식(Won-Sik Moon),방선배(Sun-Bae Bang),김재철(Jae-chul Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.10
In this paper, the even harmonic current(2nd, 4th, 6th, 8th) of the arc fault current and normal current were measured in computer load and analyzed. The BPF with GIC was developed to detection of harmonic, the exact center frequency and a high degree of sharpness could be easily obtained. The total even harmonic distortion due to series arc fault in computer load was 31.2%, this value was increased 3.9 times better than the total even harmonic distortion of normal current. The results of analysis of arc fault current RMS variation rate and Peak variation rate per half-cycle, The RMS average variation rate are as follows ; the 2nd harmonic was 0.24, the 4th harmonic was 0.15, the 6th harmonic was 0.19, the 8th harmonic was 0.25, respectively. The Peak average variation rate are as follows ; the 2nd harmonic was 0.19, the 4th harmonic was 0.12, the 6th harmonic was 0.13, the 8th harmonic was 0.15, respectively. The results of this analysis utilize data to detect of series arc fault on wiring of computer load.
양측성 폐종괴 양상을 보인 알레르기성 기관지 폐 아스페르길루스증
고원기 ( Won Ki Ko ),최승원 ( Seung Won Choi ),박재민 ( Jae Min Park ),안강현 ( Gang Hyun Ahn ),김세규 ( Se Kyu Kim ),장준 ( Joon Chang ),김성규 ( Sung Kyu Kim ),이원영 ( Won Young Lee ),최규옥 ( Kyu Ok Choe ),신동환 ( Dong Hwan 대한결핵 및 호흡기학회 1999 Tuberculosis and Respiratory Diseases Vol.46 No.2
고원석(Ko Won-Suk),배시화(Bae Si-Hwa),홍준희(Hong Jun-Hee) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.2
In this paper, demand side resources and economics are analyzed based on 100 domestic building’s power usage data in 2011. In order to participate in demand side management or response program, there is a barrier of a large amount of capacity reduction. The demand side resources in domestic are focused on industrial area but there is a need to find a variety of demand side resources from buildings. To find demand side resources, power usage and existing power equipment are investigated and analyzed for actual office buildings. The result says that an emergency generator operated at no load condition for maintenance during 12.9 hours per month. Considering demand side resource, it is identified that participating demand response program and economic evaluation are secured at the same time.
초고층복합빌딩 유지관리기술 표준기능 도출 및 사용자 화면구현
고원석(Ko, Won-Suk),배시화(Bae, Si-Hwa),홍준희(Hong, Jun-Hee),강주석(Kang, Joo-Seok) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.3
In this paper, in order to derive a basic feature of FMS, case study of the major domestic FMS are performed. After investigation, 10 main menus and 58 sub-menus are established for super tall building. Derived from the standard features, 20 selected pilot functions are selected then its user interface of function and maintenance of super tall building are designed. The characteristics of super tall buildings with one screen and also BIM capabilities are shown in a FMS user interface. Implementation of the standard features have been validated through a pilot test. This system will be applied to a Intiland building located in Indonesia.