http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
120W급 Half Bridge 공진형 DC-DC 컨버터에 관한 연구
이재득(Jae-Duk Lee),이달우(Dal-Woo Lee),안태영(Tae-Young Ahn) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
In recent years power supplies for telecommunication equipment is required smaller size and higher efficiency, and low noise operation. There exists a series resonant converter in which the switching loss is reduced in order to realize a high efficiency converter. However, if a constant voltage regulation is required. The switching frequency varies widely. In this paper we study the details of resonant DC-DC converter in which the realize a high efficiency converter.
金炳泰(Byung-Tae Kim),李達雨(Dal-Woo Lee),全明洙(Myung-Soo Jeon) 대한전기학회 2008 전기학회논문지 P Vol.57 No.3
This paper presents a study on the ground fault protection in 6.6KV ungrounded power system relay(SGR) malfunction or nori-tripping. Ground test had made on 6.6KV HV(high voltage) system, Some of domestic and oversea's SGR products are different from their own specific characteristics. This study on the ground protection relay 6.6KV power supply system is focused to protect human.
평생교육전담기관의 네트워크 실태 분석 : 충남지역을 중심으로
홍재호(Hong Jae Ho),한승록(Han Seung Lok),이달우(Lee Dal Woo),양병찬(Yang Byung Chan) 공주대학교 교육연구소 2005 교육연구 Vol.19 No.-
평생교육법 개정으로 국가 차원의 평생교육전담기관들이 설치되었고, 중앙과 시·도, 시·군·구 세 단계의 전담기관들이 수직적으로 연계되었으며, 각 지역별로 다양한 평생학습기관·단체 간의 수평적 연계를 갖도록 구조화되고 있다. 그러나 이러한 법·제도적 기반이 마련되었음에도 불구하고, 실제로 각 기관 간 연계 구조는 물론 그 기능의 활성화 면에서 많은 문제점이 노출되고 있다. 본 연구는 이러한 평생교육 네트워크의 문제점을 분석하기 위하여 충남 지역의 평생학습관 담당자를 대상으로 설문 분석을 하였다. 평생학습관의 담당자들은 지역 평생교육 활성화를 저해하는 요인으로, 지역에서 각 기관 간의 소속이 서로 다르기 때문에 생기는 이해관계의 차이를 지적하고 있다. 그러나 설문 분석 결과, 기관의 인식 부족이 지역의 평생교육 네트워크 활성화를 저해하는 요인으로 파생되어 작용하고 있었다. 이러한 분석 결과에 따라 본 연구는 지역 평생교육 네트워크 활성화의 과제로 1) 평생학습관의 역량 강화, 2) 평생교육 부서 및 평생교육사 배치, 3) 평생교육 예산 확대, 4) 타 기관과의 협력 강화, 5) 네트워크 협의체 조직을 제시하였다. According to the revision of the Law of Lifelong Learning, a number of national lifelong learning centers were set up, and the lifelong learning centers of Seoul, city-province, and city-county- district are vertically connected, and the various regional lifelong learning centers and communities are horizontally connected in its structural system. Even though these legal and regulatory foundations were prepared, there are lots of emerging problems in activation of its functions as well as the connection structure among the centers. This study performed a survey analysis to analyze the problems of lifelong learning network by targeting personnel in charge of the lifelong learning centers in Choongnam Province. The personnel in charge said that difference in interest among the centers caused by their different command lines was the main factor deteriorating the activation of regional lifelong learning. However, it turns out that the lack of understanding of the centers themselves is another derivative factor worsening the regional lifelong learning. Based on this analysis result, this study is proposing the following 5 items as action items for activation of regional lifelong learning network; 1) Reinforcing the capability of lifelong learning centers, 2) Assigning lifelong learning department and lifelong learning counselors, 3) Expanding the budget of lifelong learning centers, 4) Reinforcing cooperation with other centers, 5) Organizing network negotiation body.
이달우,김선형 순천향대학교 1993 논문집 Vol.16 No.1
This study is described to the basic analysis of the zero voltage switching resonant dc to dc converters and proposed for the control circuit satisfied of the BUCK's theoritical conditions. In this paper, the relation between the switch-on duty cycle and the transitoron duty cycle is analyzed by the use of the function of the load resistance and also proved in experimental measurement that if the switch is made structure of the antiparalled diode, FM Loop and PWM Loop is requried and if serial diode, FM Loop is required.
李達雨,趙淳彩,任珍模 全北大學校 1972 論文集 Vol.14 No.-
Authors finished cotton-cloth with various resin at 120℃ and 150℃, and determined the formalin-content of resin and finished-cloth. The relations between formalin-content of finished-cloth and curing temperature, concentration of resin-bath, kind of resin, and formalin-content of resin were investigated. The results of studr may be summarized as follows (1) The formalin-content of finished-cloth was irrespective of the formalin-content of resin. (2) The formalin-content of finished-cloth varied with accelerator. (3) The lower the curing temperature, the higher was the formalin-content of finished-cloth. (4) The higher the concontration of resin-bath, the higher was the formatin-content of finished cloth. (5) Melamine resin left more formalne on finished-cloth than urea resin.
李達雨 全北大學校 1968 論文集 Vol.10 No.-
To find out the stitching, face weave, inter weave and back weave in a design of three ply cloths, the traditional method is to eleminate face ends and picks, or center ends and picks, or back ends and picks from a given design so as to get face weave or inter weave or back weave. This procedure, however, is not satisfactory to find out the stitching point. The aim of this study lies in finding out the stitching point with ease and accuracy by employing matrix to simplify the above-mentioned Procedure.