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전원모듈 소형화를 위한 Planar Inductor/Transformer 설계에 관한 연구
안대진(Dae-Jin Ahn),지봉철(Bong-Chul Ji),장호산(Ho-San Jang),신유용(You-Yong Shin) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Due to the emergence of smart devices and wearable devices due to the influence of the 4th Industrial Revolution, the demand for technologies such as high performance, high efficiency, and small/light weight of SMPS is increasing. However, due to the limitations of energy accumulation and conversion elements such as transformer, capacitor, and inductor, it is difficult to make it smaller/lighter. This paper deals with a study on how to design a high-efficiency and high-density power conversion system using Planar Inductor/Transformer, which can be applied to small power conversion modules. Planar Inductor/Transformer features a flat plane design and high-density winding, which improves space efficiency and power conversion efficiency. The text analyzes the requirements of the proposed power conversion module, introduces technical aspects and features of Planar magnetics, and presents design guidelines. In addition, it explains in detail how to design and manufacture high efficiency by applying Planar Inductor/Transformer.
양범호,안대진,조시형,제병권,김시몽,김병구,Yang Burm-Ho,Ahn Dae-Jin,Jo Si-Hyung,Jeh Byong-Kwon,Kim Si-Mong,Kim Byeoung-Ku 한국연초학회 2004 한국연초학회지 Vol.26 No.2
In this study, we have investigated the natural and puffing combustibility of cigarette brands and the compulsory ash-drop, and analysed factors related to the materials. Cigarette combustibility was greatly affected by the tobacco weight in cigarettes rod. Combustion rate of 4AOR cigarette made by flue-cured tobacco was 5.02 $^{mm}/_{min}\;and\;10\%$ faster than 1BO cigarette. Combustion pattern has interrelation with sugars, chlorine and ash contents among tobacco components. Combustion rate of 4DL, flue-cured tobacco was 55 seconds faster than 1CL tobacco extremely much in sugars contents, and ash drop was maintained at $21\%$ longer. Combustion time and burning rate were fast in cigarette made by expanded tobacco slice and tobacco stem and the formation of ash was poor. The length of puffed ash drop of expanded tobacco slice and tobacco stem were 18.6 mm and 25.2 mm and these forced ash drop length were 3.8 mm and 4.9 mm respectively. Puffed burning rate of general cigarette was $14.3\%$ faster than static burning rate and super slim type cigarettes was $21.3\%$ faster. Combustion rate and ash drop of domestic and foreign cigarette brands were quite different depending on tar level and cigarette types. The lower tar level, the faster combustion rate and the shorter ash drop.
양범호,정한주,안대진,김용옥,Yang Burm-Ho,Jung Han-Ju,Ahn Dae-Jin,Kim Yong-Ok 한국연초학회 2005 한국연초학회지 Vol.27 No.2
In this work, we studied the effects of the moisture contents of cut tobacco on loose end of cigarettes. The loose end of the cigarette groups decreased with the increase of moisture contents of the cut tobacco and especially the loose end of A and C groups decreased to $31\%\;and\;52\%$ with the increase of $1\%$ moisture contents. $A-13.5\%\;and\;B-14.0\%\;and\; C-14.0\%$ moisture samples showed the increase of the weight ratio of cut tobacco over 1.4mm cut length but the decrease under 1.4mm cut length. We concluded that the main reasons were regarded to reduction of small fragment tobaccos caused by increase of moisture contents and exception of air-suction transport of tobaccos to cigarette making machine. In spite of the moisture increase of cut tobaccos under fixed EPD(encapsulated pressure drop), the hardness of Band C sample groups were maintained constantly except A group. This result means that under fixed EPD, the weight of cut tobacco in cigarette rods increases to compensate the reduction of pressure drop by moisture increase of cut tobaccos.
박철수(Chol-Soo Park),강제용(Je-Yong Kang),이동윤(Dong-Yun Lee),안대진(Dae-Jin Ahn) 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.4
생육기간동안 고랑에 관수하여 토양수분을 18-20%로 유지한 고랑관수구와 자연강우에 의존하여 토양수분을 공급한 대조구의 생육 차이, 수삼 수량, 수삼 및 홍삼 품질을 조사한 결괴는 다음과 같다. 3년생 및 6년생의 생육을 조사한 결과, 고랑관수 처리구가 대조구에 비해 출아율, 전엽 및 상대생장율을 포함하는 모든 생육량이 증가하는 것으로 나타났다. 그리고 3년생의 lO a당 근수량은 고랑관수구가 대조구에 비해 50% 정도 증수되었고, 6년생은 60% 이상 증수되었다. 6년생 수삼품질은 고랑관수구가 1, 2등급 비율이 30.0%로 대조구의 22.6%에 비해 증가되는 효과를 얻었다. 홍삼품질에 있어서 고급홍삼인 천지삼 비율은 고랑관수구가 43.0%로 대조구의 30.6%에 비해 현저히 증가되는 것으로 나타났고, 홍삼품질에 영향을 주는 백피, 내공, 내백이 감소하는 반면 균열은 증가하는 경향을 보였다. 이상의 결과를 통해 홍삼의 품질을 향상시키고 생산수량을 증가시키기 위해서 생육기간에 관수를 통해 토양수분을 적정 수준으로 유지시켜 주어 생육을 증대시키고 인삼잎에 수분을 충분히 공급하여 광합성을 원활하게 하여야 함을 알 수 있다. 적절한 토양수분의 관리는 수량 및 홍삼품질을 향상시킬 수 있을 것으로 판단되므로, 앞으로는 인삼재배지의 토양특성, 기후특성 및 지형 등의 조건에 부합하는 수분의 공급방법에 관한 연구가 필요하다. This study was conducted to compare the aerial parts growth, yield of fresh ginseng roots, quality of red ginseng roots, and photosynthesis (Fv/Fm, PSⅡ) in leaves between non-irrigation plot and furrow irrigation plot during the ginseng growing seasons. The aerial part growth in furrow irrigation plot was higher than non-irrigation plot in all including the emergency rate leafing rate and relatively growth rate. Root yield per lOa in irrigation plot was increased about 50% as compared with that of non-irrigation, also heaven and earth grade of red ginseng roots yield in inigation plot was higher (40.3%) compared with that (30.6%) of non-irrigation plot in 6-years-old ginseng plant. Furrow irrigation markedly improved the ginseng quality and yield in comparison to non irrigation condition. Therefore it needs to control the soil moisture during the growing season for high yield and good qualities of ginseng roots.