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코어 없는 PCB 변압기와 인덕터를 이용한 ZVS Forward DC-DC 컨버터
황선민,안태영,Hwang, Sun-Min,Ahn, Tae-Young 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.4
본 논문은 코어 없는 PCB(Print circuit board) 변압기와 인덕터를 이용한 ZVS (Zero voltage switching) Forward DC-DC 컨버터의 실험 결과 및 실용 가능성을 보고한 것이다. 최대출력 12W, 최대 스위칭주파수 2.2MHz, 정격 입력전압 24V를 갖는 실험용 컨버터가 검증되었다. 코어 손실이 없기 때문에 코어 없는 PCB 변압기와 인덕터가 고주파 동작에 적합하다는 것을 밝혔다 실험 컨버터는. 최저 70% 에서 80%의 전력변환 효율을 나타내었고, 12V 출력전압은 0.7% 이내에서 안정되었다. The experimental results and application potentials of a ZVS Forward DC-DC converter based coreless PCB transformer and coreless inductor are presented. The experimental converter, that has a maximum power of 12W, maximum switching frequency of 2.2MHz and nominal input voltage of 24V, has been successfully implemented. The coreless PCB transformer and inductor are found to have many favorable characteristics to high frequency operations due to the absence of a core loss. A power conversion efficiency of the experimental converter was measured at 70${\sim}$80%, and the output was regulated at 12V within 0.7% tolerance.
외래잡초 미국좀부처꽃(Ammannia coccinea)의 확산과 생육지 특성
황선민,길지현,김영하,김성열 한국잔디학회 2014 Weed & Turfgrass Science Vol.3 No.4
Purple ammannia (Ammannia coccinea Rottb.) is an exotic weed originated from North America. It was known tobe a noxious weed in a rice paddy field for the competition with rice. We investigated its distribution and habitat types in Korea toobtain basic data for the management plan of this species. Although purple ammannia is currently not a dominant species in naturalhabitats, its nationwide distribution was found in our study. We categorized the types of its habitats as margins of rice paddies,abandoned paddy fields, riverine wetlands and reservoirs. Particularly, purple ammannia plants were frequently located alongbanks of irrigation channels that ran through rice paddies and surrounding wetlands. Because they mainly occurred along thedirection of water flow, we considered that the plants have spread along water courses. A total of 69 vascular plant taxa was identifiedat the habitats of purple ammannia. The largest group of life form among purple ammannia population was therophytes,which indicates that purple ammannia mostly grow in the disturbed habitats. 본 연구는 부처꽃과에 속하는 북아메리카 원산의 외래잡초이며 농경지에서벼와 경합을 하는 것으로 알려져 있는미국좀부처꽃(Ammannia coccinea)의 분포와 생육지 유형별 특성을 조사하여, 관리 계획에 필요한 기초적인 자료를제공하고자 하였다. 미국좀부처꽃은 자연상태의 생육지에서넓은 면적으로 우점 분포하는 것은 확인되지 않았지만, 전라남도, 경상도, 충청도, 강원도 등 전국적으로 흩어져 분포하고 있다. 생육지 유형은 크게 논 주변부, 묵논, 하천습지, 저수지 등 4가지로 구분되었다. 조사된 지점들 중 많은지점이 농경지 주변의 습지 지역으로 벼농사를 위해 농수로가 연결되어 있는 환경이었다. 다수의 조사지점에서 농수로가 흐르는 방향을 따라 미국좀부처꽃이 분포하는 것으로 볼 때 미국좀부처꽃은 물길을 따라 확산되는 것으로판단된다. 미국좀부처꽃의 생육지에서 조사된 관속식물은총 27과 51속 64종 5변종 등 모두 69분류군이 생육하는 것으로 조사 되었다. 생활형을 분석한 결과 일년생식물(Th)이 36분류군, 52%로 가장 높게 출현하여 미국좀부처꽃의생육지가 교란이 많이 일어나는 지역임을 확인할 수 있었다
황선민,이웅빈 용인대학교 자연과학연구소 2009 自然科學硏究所論文誌 Vol.14 No.1
The investigated area is located 36° 50′ 20″∼36° 51′ 30″ N in latitude at 126° 39′ 20″∼126° 40′ 30″ E in longitude. The investigated vascular plants consist of total 140 taxa: 3 forms, 16 varieties, 2 subspecies, 121 species, 99 genera, 55 families, 32 orders, 5 classes. 8 special plants designated by Ministry of Environment were investigated: 4th grade for 1 taxa, 3rd grade for 1 taxa, 2nd grade for 1 taxa, and 1st grade for 5 taxa. There is two taxa korean endemic plant that is Celtis choseniana Nakai and Saussurea eriophylla Nakai. As for the useful plants, there were 88 taxa of edible ones(62.9%), 65 taxa of medicinal ones(46.4%), 16 taxa of ornamental ones(11.4%), 59 taxa of industrial ones(42.1%), and 3 taxa of poisonous ones(2.1%). Naturalized plants were distributed 4 taxa.
황선민,이웅빈 용인대학교 자연과학연구소 2008 自然科學硏究所論文誌 Vol.13 No.1
Abstract - Mt. Yeogye is located 37°10' 10″~37°10' 40″ N in latitude at 127°01' 30″~127° 03' 00″ E in longitude in Gyeonggi-do. The investigated vascular plants consist of total 120 taxa: 1 forms, 16 varieties, 103 species, 87 genera, 37 families, 21 orders, 4 classes. Six special plants designated by Environment Ministry were investigated: 4th grade for 2 taxa, 3rd grade for 1 taxa and 1st grade for 3 taxa. As for the useful plants, there were 55 taxa of edible ones(45.8%), 24 taxa of medicinal ones(20.0%), 11 taxa of ornamental ones(9.2%), 21 taxa of industrial ones(17.5%), and 2 taxa of poisonous ones(1.7%) respectively.