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윤성철,박은우 한국농림기상학회 2000 한국농림기상학회지 Vol.2 No.4
A glass chamber experiment was conducted to evaluate the impact of ozone(O_3) on the physiology of two soybean, Glycine max L. cultivars, 'Hwanggum" and 'Jangyub'. Thirty-day old plants with 1-2 nodes were exposed to O_3 of<10 and 150 nl l^-1 in the chambers for 8 h^d-1 for 3 days. Net photosynthesis, stomatal conductance, chlorophyll a, chlorophyll b and total chlorophyll contents, and foliar injury(% injured leaves) were measured. Although foliar damage was more severe on Jangyub than on Hwanggum, net photosynthesis was decreased by 60% on Hwanggum and 13% on Jangyub due to the O_3 treatment. Stomatal conductance on Jangyub was twice higher than that on Hwanggum and 13% on was not changed by the O_3 treatment. Whereas, stomatal conductance on Hwanggum was 60-80% decreased by O_3. Chlorophyll contents did not change due to the O_3 treatment or variety. We can conclude that the reduction of net photosynthesis by O_3 was mainly due to the decreases of stomatal conductance and Rubisco (ribulose-1, 5-bisphosphate carboxylase/oxygenase) activity on dark reaction. And foliar injury and chlorophyll content did not contribute to the net photosynthetic decrease. The gas-exchange variables measured 24 h after the termination of O_3 fumigation showed that there was no significant recovery within a day. Since the physiological responses on Jangyub were not much affected by the O_3 treatment, this variety could be O_3 resistant.
윤준식,박규호,윤철상,박준석,안달 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1
일반적으로 LPA에서는 위상을 조정하기 위해 매우 긴 지연선을 필요로 한다. 지연성능은 고전력이나 저전력 모두에서 임의의 길이의 동축선로를 여러번의 과정을 거쳐 적용해봄으로써 구현된다. 그러나 동축선로형 지연선은 부피나 높은 삽입손실등의 제약이 많이 따른다. 본 논문에서는 마이크로스트립 형태의 지연선 대역통과 여파기를 설계하였고, 실험결과는 지연선여파기가 동축선로를 대신하여 LPA 시스템에 적용이 가능함을 보였다.
윤동우,오성남,김갑일,손영익,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
In addition to accurate position and velocity control, force control is necessary for a successful robot operation. In this paper, we have designed a simple robot gripper using a DC motor. For its force control, a current feedback control law is presented without using additional force sensors. Experimental results prove the effectiveness of the proposed control law. A digital controller is also developed with a TMS320LF2406 processor.
윤해철,조성호 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1
The purpose of this study is to investigate whether the text book is used effectively in the practical physical education and, if not, to reveal the reason and find the direction and remedy to reform the school physical education curriculum. The subjects of this survey were 182 of teachers and 1,671 of students and the results were analyzed by using SAS package program. The main results obtained can be summarized as following: First, although students are interested in the class of physical education, there is no variety in the class of both theory and practice. Second, the text book is unsystematically used in the class of the physical education theory. Although students recognized the text book to be used in the class, the contents of the text book did not satisfy students. From the result of this study, we can find that teachers and students relatively want to use the text book in the class of physical education. However, there are many problems in the contents and the practicability of the text book is very low.
국내건설공사 클레임사례를 기준한 위험요인 및 대응전략 분석
윤철성,김선규 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
According to the growth of society, The risk events of construction project have been increased against the past because it is called for variety and complexity. So that, we are recognized, the risk identification and risk response strategy are very important things in the construction project. The existing studies about judicial precedent of claim deal with mainly proving of method which is to search the judicial precedent data, to make a decision of claim and to decide schedule of construction project. Because it dose not deal not deal with judicial precedent of clime as risk management view, however, it is not helpful so much to respond at the risk for the process of construction project to the owner and the contractor. The purpose of this study, therefore, is that it identifies the risk events and set up the risk response strategy, through analysis of judicial precedent of claim as a risk management view.
윤성철 한국환경농학회 2004 한국환경농학회지 Vol.23 No.3
공시된 세 품종의 고추에 대한 단기간의 오존 처리로 잎에서 나타나는 전형적인 증상은 갈색의 괴사 반응이었으며, 괴사가 심했던 오존 감수성인 다보탑과 같은 농도에서 괴사가 전혀 없었던 부촌 품종을 오존 저항성 품종으로 판단되었다. 고추의 두 품종에서 오존 처리에 의해 광합성 및 기공 전도도 등의 생리생태적 저해가 뚜렷이 나타났다. 그러나 잎에서 가시피해 정도와 생리생태적 저해 정도와의 상호 연관성으로 고추에서의 오존 저항성 기작을 설명하고자 하였으나 생리생태적 반응으로 잎에서 발생하는 오존 저항성의 기작을 설명할 수 없었다. 다만, 고추에서 오존 처리에 의한 광합성 감소는 뚜렷한 기공전도도 감소와 명반응에서 광합성 기구들의 손상에 기인한다고 여겨진다. 그러나, 암반응에서 생화학적 반응을 설명할 수 있는 A-Ci curve 상에서는 오존 처리에 따른 효과를 찾을 수 없었다. Ozone effects were studied by plant growth chamber to evaluate the impact of ozone (O₃) on the physiology of two hot pepper, Capsicum annuum L., cultivars, 'Dabotab' and 'Buchon'. Forty-day old plants with 5~7 leaves were exposed to O₃ of <20 and 150 nL/L for 8 h/d for 3 days. Net photosynthesis and stomatal conductance were measured and foliar injury was described. Foliar damage due to the treated O₃ was different from the varieties.'Dabotab' was most sensitive to O₃ and 'Buchon' was resistant. Symptom of ozone damage on the leaves was bifacial necrosis. Decreases of net photosynthesis by O₃ were 56% and 40% on 'Dabotab' and 'Buchon', respectively. Decreases of stomatal conductance by O₃ were 66% and 63% on each variety. O₃ damage on net photosynthesis was started at the low levels of light on the two hot peppers. In addition, assimilation-internal CO₂ concentration curves were not different from the two varieties. In conclusion, O₃ closed the stomata and decrease net photosynthesis on hot peppers regardless of the ozone sensitivity on leaf injury, but the difference of ecophysiological responses between the two varieties was not found clearly.