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Inlay PCBs를 적용한 차량용 48V to 12V DC-DC converter의 전기적/열적 특성분석을 통한 최적화 연구
도한진(Han-Jin Do),박재현(Jae-Hyun Park),조성헌(Sung-Hun Jo),송현욱(Hyun-Wook Song),박시홍(Shihong Park) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
Recently, the 12V power converter has limitations due to the increase of power consumption in the vehicle. As a result, the need for a 48V power source has increased and the development of a 48V to 12V DC-DC converter is actively underway. This paper presents the results of the parasitic component and the thermal distribution through the analysis of the electrical/thermal characteristics according to the structure of the DC-DC converter using the Inlay PCB, and suggests the optimal structure based on this.
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LED Fault 검출 기능 및 저 전류 소비특성을 갖는 자동차 헤드라이트 시스템용 Matrix Management IC
송현욱(Hyun-Wook Song),도한진(Han-Jin Do),박시홍(Shi-Hong Park) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
본 논문에서는 LED fault 검출 기능 및 저 전류 소비특성을 갖는 자동차 헤드라이트 시스템용 Matrix Management IC를 제안한다. 본문에서는 제안하는 IC가 어떤 회로들로 구성되어 있는지, 저 전류 소비특성을 갖기 위해 어떤 방법을 적용하였는지, fault 신호를 어떻게 검출하는지에 대하여 설명한다. 결론에서는 제안하는 IC의 시뮬레이션 결과와 함께 추후 연구 방향에 대해 서술한다.
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都漢鎭 동국지리학회 1982 東國地理 Vol.- No.3
The aim of this study measures the surficial movement of talus under the climatic conditions like those of Korea. I have measured the movement from datum point by painting white color on the surface of square; width 1m, length 0.5m. The study area is Munkuyng Eup and Masung Myun, Munkuyng Gun is Korea. The debris crushed by freezing and thawing repeatedly from the exposed cliff is accumulated under cliff and downsloping phenomenon have been known as improtant landforming elements. The cliff has enormous joints and the water which is immersed into joint make often needleice by the rapidly changing temperature, that phenomenon from talus' : supply material eventually by causing rock's crush from the having crevices of joints. In general talus is said that mechanical weathering products of cliff are accumulated on the bottom. To study the mass movement, quantitative survey and analysis are needed, but because there is not general method and prestudying example there are scanty aspect, I tried to test quantitative survey of surficial movement, quantitative survey and analysis are needed, but because there is not general method and prestudying example there are scanty aspect, I tried to test quantitative survey of surficial movement. By Sharpe, C.F.S' classification talus creep is contained at very slow mass movement and in this case only gravity is a great force and other media factors do not operate greatly. But we must not neglect water's operation which reduces friction in downslope movement and increases rock's weight, and we must not neglect inclination's role which affects direct the velocity of cliff. Again rock's feature in talus downsloping permits easy percolation and drainage when particle penerates into mass because of the finest form. According to this study, eventually we can see that the smallest size of in "A" area showed evident movement. But in gentle slope area we can't see any movement in short time. In this point talus creep reveals complexity. But we can't convict that location of surveying point was not disturbed by anything except agency. Schumm. S. A. excluded the fact that there were wild animals and humans in the course of debris' movement. But when we think creep phenomenon is not only natural effect but synthetical effect, wild animals are not disturbance but one of the talus creep factors. In this study I took the results as analysis data because it was for me to make the evident proof. The effect that systematic operations of freezing, thawing and rainfall influence creep are great. Because the organic operations of freezing, thawing and rainfall have a great effect on creep, we think that it is very brisk under the climate like our nation. Freezing in winter is thought to be the premise of debris movement in summer rainfall. As the finest material is accumulated in talus, vegetation is grown up between the supply material of debris and talus top in most of talus. The result of this study: 1. The possibility of creep is great in case of finer structure than roundness. 2. To the frequent exchange of freezing, thawing and to debris production in cliff brisk temperature variation must be essential. 3. High intensity rainfall such as our nation is effective mechanism to loosen surface. 4. As far as creeping velocity, slope inclination is greatest control factor, so high relief suffered rapid erosion but low relief is slow. From now on, I think we must study the feature of talus creep through survey and analysis over more regions and we study not only surficial but also vertical the quantitative analysis of movement.
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