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농업기술 - 옥수수 주 해충인 조명나방의 발생생태와 예찰
정진교,Jeong, Jin-Gyo 전국농업기술자협회 2012 농업기술회보 Vol.49 No.4
옥수수를 재배할 때 가장 문제가 되는 해충은 조명나방(Ostrinia furnacalis)이다. 조명나방은 나비목 포충나방과에 속하는 곤충으로 유럽과 아메리카, 아프리카 대륙을 제외한 여러 지역에 분포하는데, 국내에서는 1924년 처음 기록되었다. 먹이로는 외떡잎식물인 옥수수, 수수, 조, 율무뿐만 아니라 피망과 같은 쌍떡잎식물도 있어 기주식물 범위가 넓은 해충으로 알려져 있다. 애벌레가 먹이식물의 줄기와 열매 속으로 파고 들어가 안에서 먹는데, 옥수수에는 잎, 줄기, 수꽃과 암술, 열매의 겉과 속에 구멍을 내어 피해를 준다. 외부에 노출되지 않고 식물의 안쪽에서 생활하는 곤충으로 관리하기에 어려운 점이 많다. 따라서 조명나방에 대한 이해를 돕고자 조명나방의 생태와 예찰방법을 소개한다.
기계학습 기반의 공막 색을 통한 황달 컴퓨터 보조진단 알고리즘
정진교(Jin-Gyo Jeong),이명숙(Myung-Suk Lee) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.12
This paper proposes a computer-aided diagnostic algorithm in a non-invasive way. Currently, clinical diagnosis of jaundice is performed through blood sampling. Unlike the old methods, the non-invasive method will enable parents to measure newborns’ jaundice by only using their mobile phones. The proposed algorithm enables high accuracy and quick diagnosis through machine learning. In here, we used the SVM model of machine learning that learned the feature extracted through image preprocessing and we used the international jaundice research data as the test data set. As a result of applying our developed algorithm, it took about 5 seconds to diagnose jaundice and it showed a 93.4% prediction accuracy. The software is real-time diagnosed and it minimizes the infant’s pain by non-invasive method and parents can easily and temporarily diagnose newborns’ jaundice. In the future, we aim to use the jaundice photograph of the newborn babies’ data as our test data set for more accurate results.
정성교,정진교,이만렬,Jeong, Seong-Gyo,Jeong, Jin-Gyo,Lee, Man-Ryeol 한국지반공학회 1997 지반 : 한국지반공학회지 Vol.13 No.5
Classical earth pressure theories normally assume that ground condition remains uniform for considerable distance from the wall, and that the movement of the wall is enough to result in the development of an active pressure distribution. In the case of many low gravity walls in cut, constructed, for example, by using gabions or cribs, this is not commonly the case. In strong ground a steep temporary face will be excavated for reasons of economy, and a thin wedge of backfill will be placed behind the wall following its construetion. A designer then has the difficulty of selecting appropriate soil parameters and a reasonable method of calculating the earth pressure on the w리1. This paper starts by reviewing the existing solutions applicable to such geometry. A new silo and a wedge methods are developed for static and dynamic cases, and the results obtained from these are compared with two experimental results which more correctly mod el the geometry and strength of the wall, the fill, and the soil condition. Conclusions are drawn concerning both the magnitute and distribution of earth pressures to be supported by such walls.