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- 저자 : 이일병(Y.B. Lee) (검색결과 4 건)
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윤일병,이성진,양서영 ( I . B . Yoon,S . J . Lee . S . Y . Yang ) 한국환경생물학회 1996 환경생물 : 환경생물학회지 Vol.14 No.1
Food habits and life history of Bombina orientalis and Hyla japonica were conducted to elucidate their ecological traits of each species from June 1994 to May 1995. As a result, prey resource of B. orientalis more abundant than H. japonica. Especially only B. orientalis fed gastropoda. In two species, prey preference was shown in the level of both species and order of prey. In B. orientalis, Hymenoptera was most important prey order, but, in H. japonica, Homoptera. The relationship between frog size and mean of prey size was not significant but that between frog size and maximum of prey size was significant in each species. This result show that the range of prey size is extended according to increase of frog size in both B. orientalis and H. japonica. Prey preference of H. japonica was changed as prey size changed, but that of B. orientalis was not. Both prey diversity and feeding quantity of each species increased in Autumn. The egg of B. orientalis was reared in 17-20℃ in Lab. Egg hatching of B. orientalis was started 4 days after from sampling day. After egg hatching, tadpole had grown in the duration of 94 days before they became adult. The duration of egg stage was shorten about a week in laboratory compared with field. Duration of tadpole stage, however, was longer about 3 week in a Lab. compared with field. This durational disagreement of each stage seemed to be affected by difference of temperature and food between field and laboratory.
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서울 근교 왕숙천의 유역 환경변화에 따른 수서곤충 (水棲昆蟲) 군집의 장기변동
윤일병,배연재,이현철,이상조 ( I . B . Yoon,Y . J . Bae,H . C . Lee,S . J . Lee ) 한국환경생물학회 1993 환경생물 : 환경생물학회지 Vol.11 No.2
A long-term change of aquatic insect community was studied in the Wangsuk creek, a branch stream of the Han river near Seoul, based on independently taken quantitative samplings in the years of 1967, 1983, and 1992. Aquatic insect communities were compared between the years using taxon proportions, dominant species, dominance indices, diversity indices, etc., with various environmental factors. In the lower stream, where the most rapid human population growth and urbanization have been proceeded since 1967, the aquatic insect community has been greatly changed becoming more simple (higher species dominance) and less diverse (lower species diversity) community. Most intolerent aquatic insects, e.g., Plecoptera and Ephemeroptera, have been disappeared and Chironomidae became predominant in that region. In the upper stream, on the other hand, where nearly no change of human population has been shown since then, relatively little change of aquatic insect community has been indicated. We therefore concluded that the long-term change of aquatic insect community in the Wangsuk creek has been strongly affected by human-influenced environmental change in the drainage areas. This conclusion was also supported by comparisons with similar studies in the Chojong creek and Kapyong creek, nearby branch streams of the Han river.
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도롱뇽과 꼬리치네도롱뇽의 먹이자원 및 생활사에 관한 연구
윤일병,이성진,양서영 ( I . B . Yoon,S . J . Lee,S . Y . Yang ) 한국환경생물학회 1996 환경생물 : 환경생물학회지 Vol.14 No.2
Prey resource and life history of two salamander species, Hynobius leechii and Onychodatylus fischeri, had been studied from June 1995 to May 1996. In species diversity of prey item, O. fischeri was more diverse than H. leechii. This indicated that 0. fischeri had more diverse prey resource than H. leechii. Insect was major prey item in 0. fischeri but not in H. leechii. Non-insect prey items was as much as insect prey item in H. leechii. This indicated that H. leechii was less dependant on insect than O. fischeri. A number of aquatic insects, especially their larvae, were found in the gut of O. fischeri, and especially Trichoptera occupied great portion. So we assumed that 0. fischeri might be able to feed aquatic insects in the water. Cannibalism was shown at larvae stage of both salamander species, but continued to adult stage only in case of H. leechii. The egg of H. leechii was reared in 17∼20℃ in Lab. Egg hatching of H. leechii was started 13 days after egg sampled. They started to become adult and moved out from water at 115 days after egg sampled. The duration of egg stage was shorten about 1 or 3 weeks in laboratory compared with field. But larval stage was very shorten in the comparison of field data. This durational disagreement of each stage seemed to be affected by differences of temperature and food between field and laboratory.
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시계열 자료 코스피200의 패턴분류를 위한 퍼지 서포트 벡타기계
이수용(S.Y. Lee),손소영(S.Y. Sohn),김철응(C.E. Kim),이일병(Y.B. Lee) 한국지능시스템학회 2004 한국지능시스템학회논문지 Vol.14 No.1
주식시장에서 KOSPI200지수의 상승 또는 하락으로 분류 및 예측하는 정보는 선물 및 옵션시장에서 포토폴리오를 설계할때 의사결정을 위해 중요한 기준이 된다. 경제지표인 시계열 패턴들의 향후 추세는 가장 최근의 경제패턴에 매우 종속적이기 때문에 최근의 패턴들을 가장 우선적으로 학습해야 할 필요가 있다. 본 논문에서는 시계열분석, 신경회로망, 그리고 다양한 분야에서 각광을 받고 있는 SVM(Support Vector Machine)과 Fuzzy SVM 모형의 분류 및 예측성능을 비교하였다. 특히 학습 DB에 따라 시계열성 속성을 갖는 퍼지소속함수에 가장 적합한 차원을 제시함으로서 Fuzzy SVM이 우수함을 입증하였다. The Information of classification and estimate about KOSPI200 index's up and down in the stock market becomes an important standard of decision-making in designing portofolio in futures and option market. Because the coming trend of time series patterns, an economic indicator, is very subordinate to the most recent economic pattern, it is necessary to study the recent patterns most preferentially. This paper compares classification and estimated performance of SVM(Support Vector Machine) and Fuzzy SVM model that are getting into the spotlight in time series analyses, neural net models and various fields. Specially, it proves that Fuzzy SVM is superior by presenting the most suitable dimension to fuzzy membership function that has time series attribute in accordance with learning Data Base.
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