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김현일(Kim Hyun-Il),서승직(Suh Seung-Jik),강기환(Kang Gi-Hwan),유권종(Yu Gwon-Jong),박경은(Park Kyung-Eun),노지희(Noh Ji-Hee) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
It is well-known that most of the solar radiation absorbed by photovoltaic (PV) module is not converted to electricity but contributes to increase the temperature of the module, thus reducing the electrical efficiency. It is also important to consider building integrated Photovoltaic (BIPV) as an integral part of the environmental systems of a building if the application of BIPV is to be successful, because just applying PV onto already designed building envelope, and treating the PV system as an element as if independent from the building, will not enable optimum performance. In this paper, roof integrated PV modules are studied. : Indoor experiment and outdoor exposure experiment. Difference of temperature between the front and back of PV module is about 13.4~22.3℃. If each layer of PV module measures temperature, we will know about heat transfer of PV cell and change of thermal environment of indoors in detail. Therefore this paper presents the comparison of electrical, architectural and thermal performance of roof integrated photovoltaic(PV) modules, which is composed of different hybrid structure layer such as insulation.
전기화학적 산화처리가 탄소섬유/극성화된 폴리프로필렌 복합재의 기계적 계면 특성에 미치는 영향
김현일 ( Hyun Il Kim ),최웅기 ( Woong Ki Choi ),오상엽 ( Sang Yub Oh ),안계혁 ( Kay Hyeok An ),김병주 ( Byung Joo Kim ) 한국공업화학회 2013 공업화학 Vol.24 No.5
In this work, the effects of electrochemical oxidation of carbon fiber surfaces on mechanical interfacial properties of carbon fibers-reinforced polarized-polypropylene matrix composites were studied with various current densities during the treatments. Surface properties of the fibers before and after treatments were observed by SEM, AFM, XPS, and contact angle measurements. Mechanical interfacial properties of the composites were measured in terms of critical stress intensity factor (KIC). From the results it was found that O1s peaks of the fiber surfaces were strengthened after electrochemical oxidation which led to the enhancement of surface free energy of the fiber, resulting in good mechanical performance of the composites. It can be concluded that electrochemical oxidation of the carbon fiber surfaces can control the interfacial adhesion between the carbon fibers and polarized-polypropylene in this composites system.
김현일(Hyun-il Kim),박철희(Cheolhee Park),홍도원(Dowon Hong),서창호(Changho Seo) 한국정보과학회 2016 정보과학회논문지 Vol.43 No.2
데이터 중복제거 기술은 클라우드 스토리지를 절약하기 위해 반드시 필요한 기술이다. 평문데이터 중복제거 기술은 기본적으로 데이터의 기밀성을 유지하지 못하므로 암호데이터 중복제거 기술이 필요함은 당연하다. 본 논문은 키 발급 서버의 도움을 받는 암호데이터 중복제거 기술에 대해 연구하며 그 중 Bellare 등이 제안한 기법에 대한 분석 및 구현을 수행하였으며 키 발급 서버를 이용한 기술에 대한 효율성 측정을 위해 상용 클라우드 서비스 상에 Bellare 등이 제안한 기법과 평문 및 ConvergentEncryption에 대한 성능 측정을 수행하였다. 또한 상용 클라우드 서비스인 Dropbox 및 공개 클라우드 서비스 중 하나인 Openstack의 Swift상에 구현 및 효율성 측정을 수행함으로써 키 발급 서버를 이용한 암호데이터 중복제거 기술에 대한 범용성을 검증하였다. Data deduplication is an important technique for cloud storage savings. These techniques are especially important for encrypted data because data deduplication over plaintext is basically vulnerable for data confidentiality. We examined encrypted data deduplication with the aid of a key issuing server and compared Convergent Encryption with a technique created by M.Bellare et al. In addition, we implemented this technique over not only Dropbox but also an open cloud storage service, Openstack Swift. We measured the performance for this technique over Dropbox and Openstack Swift. According to our results, we verified that the encrypted data deduplication technique with the aid of a key issuing server is a feasible and versatile method.
김현일(Hyun Il Kim),하태경(Tae Kyung Ha),권성준(Sung Joon Kwon) 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.80 No.1
Purpose: The prognosis for gastric cancer patients with distant metastasis is very poor. The purpose of this study was to evaluate the prognosis and survival for gastric cancer patients with synchronous metastasis. Methods: Among 2,083 gastric cancer patients who received surgery at the Department of Surgery, Hanyang University Hospital from 1992 to 2009, 164 patients revealed distant metastasis. However, 3 patients who died of postoperative complications were excluded. For the remaining patients, various clinicopathological factors were analyzed using univariate and multivariate survival analyses. Results: Systemic chemotherapy (SC), type of surgery, lymph node dissection, degree of peritoneal carcinomatosis (PC), presence of ascites and tumor location were significant prognostic factors. However, sex, age, number of metastatic sites and histologic classification were not significant prognostic factors. In multivariate analysis, the type of surgery, the SC and the degree of PC were independent prognostic factors. Survival benefit by SC was significant in single site metastasis. The significant survival difference between resection and non-resection groups was observed regardless of number of metastatic sites. Conclusion: In gastric cancer patients with metastasis, the favorable prognostic factors were type of surgery and SC in single metastasis. The gastrectomy improves the prognosis regardless of number of metastatic sites. However, a prospective randomized clinical trial is mandatory to attain more accurate information.
김현일(Kim Hyun-Il),서승직(Suh Seung-Jik),박경은(Park Kyung-Eun),강기환(Kang Gi-Hwan),유권종(Yu Gwon-Jong) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.6
Buildings are responsible for approximately 50% of current carbon dioxide emissions. Energy planning at a town and city scale needs a strategic approach, supported by strong planning policies. The purpose of this study was to investigate the urban scale grid-connected photovoltaic(PV) system for urban residential and commercial sector applications. The integration of PV technology into roof of houses is an approach that is being championed in Germany, Japan and United states etc. In the Korea, PV roofing systems already are given the large number of houses which are projected to be built by 2012. However unlike germany and Japan, urban scale grid-connected PV system is not yet installed. The solar city which is installed building-integrated photovoltaic system is available to use of renewable energy sources such as solar to meet demand, instead of fossil fuels, with the goal of realizing an ecologically oriented energy supply.
3축 로봇 개념을 이용한 시뮬레이션 기반 모바일 위성안테나 설계
김현일(Hyun-il Kim),김성수(Sung-Soo Kim),원문철(Moon-cheol Won),허재영(Jae-young Huh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A mobile satellite antenna has been virtually designed using 3-axes robot design concept. Mobile satellite antennas must have abilities to target a satellite and at the same time to stabilize the antenna dish in order to maintain its orientation toward the satellite. To achieve such design requirements, three axes robot design concept has been employed. A 3-D CAD model has been creel ted to virtually realize the design concept. In order to insure the created CAD model. kinematic analyses have been carried out for collision detection of the parts. Inverse dynamic analyses have been also carried out to compute required torques for motor selection using multibody dynamic analysis program ADAMS. Since mobile satellite antennas experience base motions, a relevant control system should control the three antenna axis to maintain the dish orientation to point the satellites accurately. A PIDA control algorithm are designed and Implemented into the virtual multi body model to control the yaw. level (roll). and cross-level (pitch) angle of a mobile satellite antenna. ADAMS and Matlab co-simulation scheme is employed in order to examine whether proposed PIDA control algorithm provides effective characteristics comparing with PID control.