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Onechip Microcontroller에 의한 압전 변압기를 이용한 T5 28W급 형광등 전자식안정기에 관한 연구
황락훈(L.H. Hwang),신양호(Y.H. Shin),조상로(S.R. Cho),장은성(E.S. Jang),조문택(M.T. Cho),안익수(I.S. Ahn),김주래(J.R. Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, In order to solve the problem is proposed using a new type of electronic ballast that the traditional magnetic ballasts operated at 50-60Hz have been suffered from noticeable flicker, high loss, large crest factor and heavy weight which is composed of rectifier, active power corrector, series resonant half bridge Inverter, micro-controller and piezoelectric transformer for driving for driving T5 fluorescent lamp were manufactured The proposed electronic ballast operated at high frequency (about 75kHz) shows a input power factor of more than 0.995, total harmonic distortion of less than 12% and lamp current crest factor of less than 1 5, respectively. Output power and efficiency showed 28w and 85%, respectively. Accordingly, It is considered that the ballast using piezoelectric transformer can replace the typical electronic ballast
곽준수,김창수,송영은,김주,한종현,신민교,송호준 대한본초학회 1997 大韓本草學會誌 Vol.12 No.1
This study performed for surveying insect pests which are distributing on medicinal plants in Korea. On the basis of pre-submitted data which were reported artificially, we analyzed the data and arranged the catalogue for surveying on medicinal plants in Korea. We classified it by family centering with host plants and arranged the catalogue of main insect pests by plants. The major results are as follow ; 1. The main insect pests which inflict injuries on medicinal plants showed totals on 539 species in 3 phyla, 4 classes, 14 orders and 105 families. 2. By population, arthopods were topped with 489 species (2 phyla, 11 order and 91 families) followed by nemathelminthes 47 species (1 phylum, 2 orders and 12 families), mollusca 3 species (1 phylum, 1 order and 3 families) etc. 3. Crops which showed relatively wide in host range are as follows ; Tylenchus sp. of nemathelminthes was recorded in 38 species of medicinal plants, Acusta despecta of mollusca was in 25 plants, two-spotted spider mite was in 47, tea-red spider mite was in 46, differentiate grasshopper was in 44, cotton aphid was in 23, and Sitochroa verticalis was in 33 plants.
郭晙洙,金昌洙,金柱,朴珍華,韓鍾鉉,宋昊埈 한국전통의학연구소 1997 한국전통의학지 Vol.7 No.2
전북지방의 경쟁력 있는 약용작물을 선정하여,농가소득증대 및 연구와 지도의 기초자료로 활용하고자 최근 몇 년동안의 약용작물의 재배 및 생산현황을 파악하여 종합분석하고,앞으로 기대되는 작물의 예측을 통하여 전략작목의 선정에 도움이 되는 자료를 얻기 위하여 실시한 조사분석 결과 다음과 같은 결과를 얻었다. 1. 재배,생산되는 주요 약용작물 30여종이 조사되었으며,독활등 10여종이 주요작물로 분석되었다. 2. 연도별 재배 면적 변화에서는 '93~'94년을 기점으로하여 감소하는 경향이며,이것은 WTO출범에 따라 값싼 외국산 약제의 수입으로 가격경쟁력이 떨어진 것이 주 요인인 것으로 생각된다. 3. 전북지방의 주요 약용작물 품목별 특화계수 분석에서는 독활,양유, 백지,지황,오미자 등이 가장 중요한 핵심품목으로 분석되었고,길경,두충,작약,방풍,천마 등은 주산품목으로 분석되었다. 4. 대부분의 약용작물에서 전국대비 전북지역의 생산단수가 비교적 높게 나타나 기술경쟁력이 높은 것으로 나타났다. 5. '97 약용작물 재배계획면적 조사에서는 전년대비 전반적으로 감소하였다. Through the surveying and analyzing the recent years' status of cultivation and production of medicinal plants in Chonbuk area, we could get a good data necessary for promoting farm income and guiding research and extention activities. Also it was expected for farmers to help collecting a strategic plants which were to competitive and profitable. The major results are summarized as follows; 1. About 30 medicinal plants were surveyed and 10 plants among them such as Aralia corolata were classified as major plants. 2. In changing the cultivation area by year, it showed decreasing tendencies against two previous years. It was caused mainly by imported foreign agricultural products which had much price competitiveness than ours. 3. In analyzing Specialized Coefficient(S.C.) of medicinal plants in Chonbuk, Aralia corolata, Codonopsis lanceolata, Angelica dahurica, Rehmannia glutinosa, Schizandra chinensis were dassified as core crops and Platycodon grandiflorum, Eucommia ulmoides, Paeonia lactiflora, Ledebouriella seseloides, Gastrodia elala were analyzed as main crops. 4. Relatively higher production per acreage(kg/10a) in Chonbuk than the other regions was caused by difference in technical competitiveness. 5. Generally farmer's intention to cultivate medicinal plants in 1997 showed decreasing against previous year.
대역별 웨이브렛 계수 양자화와 블록 임계값을 이용한 영상부호화
권구락,문덕철,김주도,김응성,이근영 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-
기존의 논문들은 변환에 따른 각 변환계수들의 스캐닝 방법을 고려하지 않기 때문에 최적의 변환에도 불구하고 압축 효율이 좋지 않다. 본 논문에서는 높은 화질의 영상과 계산량의 단축을 위해서 정지 영상에 웨이브렛 변환을 사용하고, 웨이브렛 변환 후 각 대역 특성별로 양자화를 수행하며, 부호화 방법에 대해 새로운 스캐닝 방법을 제안한다. JPEG 알고리듬과 제안 알고리듬을 비교하였을 때, 동일한 비트율에서 제안 알고리듬이 높은 화질의 영상을 얻을 수 있었다.