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차종환(Cha, Jong-Hwan),한상열(Han, Sang-Yeol),이호준(Lee, Ho-Jun),고장욱(Go, Jang-Uk),이현주(Lee, Hyeon-Ju),오시덕(O, Si-Deok),신형기(Sin, Hyeong-Gi),이수갑(Lee, Su-Gap),김태욱(Kim, Tae-Uk),성대영(Seong, Dae-Yeong),박성배(Park, Seong 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
본 연구에서는 에너지 및 환경에 대한 문제가 대두되면서 기술 개발의 필요성이 높아지고 있는 풍력발전시스템에 대하여 750kW급 Geared Type 가변속 풍력 발전시스템을 개발하였다. 풍력발전시스템이 급속히 대용량화됨을 고려하여 MW급의 기술 조합이 반영되도록 설계하였으며, 베어링과 같은 국내 인프라가 부족한 구성품을 제외한 모든 구성기기들을 자체 설계/제작하였다. 블레이드는 국내 풍황에 적합하도록 자체 에어포일을 설계하여 개발하였으며, 가변속 제어를 위한 이중 여자 유도발전기 및 제어기와 Down sizing 구현을 위한 유성 및 헬리컬 기어 혼합형 증속기를 개발하여 시동 풍속 3.5m/s, 정지 풍속 25m/s, 정격 풍속은 12.7m/s이며 IEC 61400-1의 Class I 에 준한 750kW급 풍력 발전시스템을 개발하였다.
차삼곤(Cha, Sam-Gon),한상열(Han, Sang-Yul),차종환(Cha, Jong-Hwan),최원호(Choi, Won-Ho),이승구(Lee, Seung-Kuh) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
For the development of wind turbine, generally simulator is used. Simulator include wind turbine components. e.g blades, pitch and pitching method, rotor, yaw system, tower, drive train and so on. Few the more, it include a external circumstance. e.g wind speed, wind direction, air density. these basic parameters be used for the control of wind turbine by wind turbine controller in wind turbine simulator. The wind turbine controller can be designed in the wind turbine simulator. But a developer must make the real control system that will be made using PLC or PC or other processor. The developer must verify the function of control system. that is control algorithm , I/O function, communication, sequence and so on. This verification is possible if we substitute the real wind turbine control system for wind turbine controller in the simulator.
작물에 흡수된 방사성 동위원소의 내부 조사 효과에 관한 연구 (4) - 교맥 (蕎麥) 생장에 미치는 P-32 시용의 잔류 효과 -
김길환(Kil Hwan Kim),차종환(Jong Whan Cha) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.1
Buckwheat seeds produced in previous year (1965) in an experimental pot culture in which nine leve1s of P-32 ranging from 1.4×10 exp (-4) to 3.3×10 exp (4) μc/pot(as of 27 July 1965), with the same specific activity, had been applied to the corresponding pots respectively, were used this year(1966) in water and soil culture as well as in germination test to investigate the feature and extent of possible residual effects of P-32 incorporated upon germination and plant growth, and the following results were obtained: 1. Under the given experimental conditions both stimulative and inhibitory effects of radiation were observed. 2. The germination rate of the seeds was lower at the higher level of P-32 application ranging from 3.0×10 exp (3) to 3.3×10 exp (4) μc/pot and higher at 0.2 μc P/pot than the control. 3. Among the seeds produced at the higher level of appiication about 80% was failed to germinate, owing to the radiation injury. The remaining 80% survived the damaging effect and showed vigorous growth and increased yield. The latter group of seeds thus proved themselves to be more radioresistant than the former. 4. The survived seeds produced later more straw and root on dry weight basis. The higher the level of P-32 applied, the stronger the stimulative effect showed in vegetative growth. 5. No radiation effect on linear growth of the plants was observed in the soil culture. 6. The dry weight of straw produced showed little difference at the moderate range compared with that of control in the soil culture. At high level of application, i.e. over μc P^(32)/pot, however, the production was increased by 12-37% of control. 7. As for the dry weight of root harvested, the P-32 treatment over 24μc P^(32)/pot produced 82-155% more than the control, whereas little difference was observed under 2.2μc P^32/pot. 8. The seed production increand in general by the P-32 treatments. Particularly at the moderate level of application the rate of increase anounted to 70% of the control. 9. Those individual plants which survived damaging effects of radiation at the germinating stage showed remarkable stimulative effects both in vegetative and in reproductive stage of growth.
작물에 흡수된 방사성 동위원소의 내부조사효과에 관한 연구 (제7집) - 대두의 (大豆) 생장에 미치는 P-32 의 영향
김길환(Kil Hwan Kim),손응용(Eng Yong Son),차종환(Jong Whan Cha),김정제(Jung Jai Kim) 한국식물학회 1969 Journal of Plant Biology Vol.12 No.3
To investigate the radiation effect of P-32 on the soybean plants, the seeds treated with various levels of P-32 solution were sown and cultured in the pots. The growth of the plants and the contents of the macroelements were observed and the following results were obtained. 1) The linear growth of the plants at the early stage seemed to have been promoted by the low-level P-32 treatment. At the later growing stage, however, this difference among treatments were less conspicuous. 2) The plants of high level P-32 application showed some growth damaging symptom at the early growing stage. Later this damage was recorded as the time went on and these plants showed even better growth than the control. As a result at the late growing stage, they ensued highest growth. 3) The plants showed in general more growth at the low activity level than at the high-level at the early growing stage. At the late stage, however, the high-level activity promoted more growth than the low-level. 4) At the early growing stage P-32 treatment produced in general significantly more lower than control. At the later stage, however, this difference was not clearly seen. 5) The P-32 treatment seemed to have stimulated earlier florescence and this tendency was more clearly observable especially at the high activity level. 6) The weight of the air-dried seeds tended to be increased through P-32 treatment by 10-45%. This tendency was clearly observed especially at the low-level activity. 7) As for the contents of the various macroelements in the leaves, the nitrogen showed significantly larger contents at the middle level(S_1) P-32 treatments. The phosphorous contents showed also highest at the middle levels activity and lower both at the high and low-activity levels. The potassium contents was proved, on the contrary, higher at the low-level activity and lower at the high-level. 8) The nitrogen contents in the stems was found significantly higher than control, except at the low-activity level. The phosphorous showed higher contents at the low-activity level and no significant difference at the high-activity level. As for the contents of potassium, calcium and magnesium, there seemed no significant difference among treatments. However, the magnesium showed somewhat higher content at the low-activity level, whereas the calcium was proved higher than control. 9) The inorganic contents in the root showed that N and P in the P-32 treated plant were significantly higher than the control and the K-contents was, on the contrary, significantly higher at the control than the rest of the treatments. As for the calcium and magnesium there showed no difference among all treatments.
P32를 이용한 녹비의 (綠肥) 수도에 (水稻) 대한 비효에 (肥效) 관하여
김길환(Kil Hwan Kim),차종환(Jong Whan Cha),은황석(Kwang Suk Eun) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.3
有機質 肥料의 施用 適量을 究明하기 爲하여 水稻를 Wagner pot(1/20,000反)에 砂耕栽培하여 그 生育을 調査하는 한편 燐酸 吸收 關係를 P-32를 追跡子로 利用 實驗하여 다음의 結果를 얻었다. 1. 有機質 肥料 施用이 本 實驗與件 下에서 作物의 線生長, 藥乾物重, 平均穗長, 稔實率, 種實風乾重等에 뚜렷한 影響을 나타내지 않았다. 2. 種實數는 對照區에 比하여 pot 當 乾燥 綠肥 10g∼20g 施用區에서 顯著히 많은 傾向을 보였다. 3. 種實重/葉重도 有機質 施用區에서 對照區에 比하여 有意差를 보였다. 4. 葉內 全 P水準은 有機質 施用量이 많을수록 時日이 經過될수록 높다. 5. 標識된 燐肥料로부터의 吸收率은 有機質 施用豊이 많을수록 旅用凌 時日이 經過될수록 얕은 傾向을 보였다. 6. 土壤으로부터의 吸收率은 前項 5와는 反對 傾向을 보이며 이러한 關係는 pot 當의 A-value에도 反映된다. 7. 綠肥 多量 施用에 따르는 水稻根의 吸收 阻害와 그밖의 生育 障害의 徵兆는 볼 수 없었다.
이상준(Sang Jun Lee),차종환(Jong Hwan Cha),최원준(Wonjoon Choi) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Herein, we report experimental and theoretical analyses of drop impact on Joule-heated metal wires with a wide temperature rage; from ambient to over Leidenfrost temperatures for different drops (ethanol, water, and acetone). According to physicochemical properties of drops, Weber number, and wire temperatures, the impacting drops reveal three distinct impact regimes, classified as tail, splash, and jumping modes. The drops in tail mode show a wrapping of wire and a consecutive free-fall at below saturation temperatures. The splash mode, observed above saturation temperatures, shows circularly spraying mono-dispersed drops around wires. Lastly, the jumping mode is classified as the presence of half-ring shape bouncing daughter drops above Leidenfrost temperatures. Theoretical analyses show drop volume and Weber number were decisive parameters for the onset of jumping mode, while the physicochemical properties of liquid drops were crucial for determining the threshold for splash mode.