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황태환,이규송,박상덕,정연숙 한국생태학회 2007 Journal of Ecology and Environment Vol.30 No.3
ABTRACT: The loss of nitrogen and phosphorus from sediments in two watersheds, one naturally regenerating and one artificially planted, in Sacheon-myun, Gangneung-si, Gangwon Province, were measured two years after a forest fire in 2000. Sediment losses occurred five times in the course of the year. In the artificially planted watershed, 50~140 times more nitrogen and 54~139 times more phosphorus were lost with sediments during heavy rains, from July to August, than in the naturally regenerating watershed. When the typhoon Rusa struck the country, 1,389 times more nitrogen and 1,647 times more phosphorus were lost from the artificial watershed. In spite of the limited scope of this study, these results suggest that artificially planted watersheds are extremely vulnerable to catastrophic natural disasters such as typhoons. Elevated loss of nutrients in the artificially planted watershed might have resulted from the mechanized silvicultural practices employed immediately after the fire. To maximize soil preservation, the timing and necessity of plantation practices should be reconsidered, and rapidly regenerating vegetation should be protected to promote nutrient uptake and to mitigate nutrient loss from burned forests.
황태환,안호균,박승규 제어로봇시스템학회 2013 제어로봇시스템학회 각 지부별 자료집 Vol.2013 No.12
This paper proposes a new H∞ T-S fuzzy controller with a novel integral control for Permanent Magnet Synchronous Motor(PMSM) which have nonlinear dynamics. The H∞ T-S fuzzy controller is used for the nonlinearity and robustness and weighted integral is used for tracking problem and control performance. A T-S fuzzy controller is the fuzzy combination of local controllers considering the overall stability, and LMI(Linear Matrix Inequality) is used for determining the gains of linear controllers. The tracking problem of an PMSM is changed into regulator problem by introducing the integral control technique with weighting factor, diminishing the conservatism of H∞ fuzzy controller.
증설(證說) : 포황(蒲黃)의 독성(毒性)과 부작용에 관한 문헌적 고찰
황태환 ( Tae Hwan Hwang ),김종대 ( Jong Dae Kim ),노성수 ( Seong Soo Roh ),서부일 ( Bu Il Seo ) 대구한의대학교 제한동의학술원 2011 東西醫學 Vol.36 No.3
Typhae Pollen is in use in eastern medicine. Eastern medical doctors use Typhae Pollen for removing heat from the blood to stop bleeding(凉血止血), activating blood flow and removing blood stasis(活血祛瘀), etc. We investigated toxicity, poisoning symptoms, side effect, poisoning treatment and prevention against poisoning of Typhae Pollen. The results were summarized as follows:1. Typhae Pollen mainly cause the decrease of appetite, inconvenience of stomach part for side effects, etc. And when the patients use the powder of Typhae Pollen for external use, the allergic reaction on the skin can be showed up. 2. If the patient has a slight poisoning reactions or side effects, the symptoms are disappeared automatically with the lapse of time. 3. In order to prevent against poisoning of Typhae Pollen, the patients should keep usage, dosage and notes.
황태환(Hwang Tae Hwan),백재순(Baik Jae Soon),이준호(Lee Jun Ho),박건율(Park Kon Yul),최준원(Choi Jun Won) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 노이즈 레이블이 섞인 데이터세트에 대해 오직 한개의 네트워크만 사용하여 강인한 학습을 하는 기법을 제안한다. 제안된 방법은 학습단계에서 알맞게 라벨링된 샘플을 알아내기 위해 두 종류의 샘플 선택 기준을 사용한다. 첫번째 기준은 이전 시간들의 모델 앙상블의 손실함수값이다. 시간적으로 분리된 모델 앙상블을 만들기 위해 주기적 학습률을 적용한다. 이전 시간적 앙상블에 대한 손실함수값은 깨끗한 샘플을 감지하는 기준을 제공한다. 두 번째 기준은, 데이터 변형을 적용하여 다시점으로 예측을 하게하여, 이 예측들의 일치가 학습과 샘플 선택을 하는데 둘다 사용되게 한다. 이러한 기준들을 같이 사용함으로 써 알맞게 라벨링된 샘플을 정확하게 감지할 수 있고, 여러 개의 네트워크를 사용한 방법보다 더 나은 성능을 도달할 수 있다. 본 연구는 CIFAR-10, CIFAR-100, MNIST 등 일반적으로 널리 사용되는 데이터세트를 이용하여 수행되었으며, 기존 방법들에 비해 높은 성능을 도출하는 것을 확인하였다.