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냉각수 가열장치의 온도 최적화를 위한 열전도 해석에 관한 연구
한대성,배규현 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.1
This study investigates the outlet temperature of coolant heater based on heat and flow volume conditions. Through computer simulation, the coolant temperature at the outlet was analyzed to investigate the heat and flow volume conditions of the coolant heater, and the optimal conditions were derived. Results show that heat and flow volume conditions, it was confirmed that heat condition is 0.424 W/mm3, and flow volume condition is 500 l/h, demonstrates optimal conditions. The results of this study can be utilized to efficiently control the coolant temperature through various heat and flow volume conditions.
농업환경(農業環境)의 오염(汚染)과 그 대책(對策) 제(第) 1 보(報) 몇가지 제초제(除草劑)에 의한 토양(土壤) 흡착(吸着)의 이론적분석(理論的分析)
한대성,김정제,신영오,Han, Dae-Sung,Kim, Jeong-Je,Shin, Young-Oh 한국환경농학회 1984 한국환경농학회지 Vol.3 No.1
토양(土壤)에 의한 linuron, bentazon, trifluralin 및 butachlor의 흡착(吸着)을 나타내는데 있어서 Freundlich adsorption isotherm이 사용되었으며, 실험결과(實驗結果)를 요약(要約)하면 아래와 같다. 토양(土壤)에 의한 linuron의 흡착(吸着)은 토양성분중(土壤成分中) 유기물(有機物)의 함량(含量)과 직접적인 관계(關係)가 있으며, 유기물(有機物)의 함량(含量)이 증가(增加)함에 따라 linuron의 흡착(吸着)도 증가(增加)하였다. Bentazon은 토양유기물(土壤有機物)이나 점토(粘土)의 함량(含量)에 따라 뚜렷한 상관(相關)이 없었으며, 오히려 유기물함양(有機物含量)이 증가(增加)됨에 따라 흡착(吸着)은 감소(減少)하는 경향(傾向)이었다. 이러한 현상은 bentazon이 토양용액중(土壤溶液中)에서 음하전(陰荷電)을 띠어 bentazon분자(分子)와 음하전(陰荷電)을 띤 토양표면간(土壤表面間)의 반발현상(反撥現象) 때문인 것으로 추정(推定)되었다. Trifluralin과 butachlor는 토양유기물함량(土壤有機物含量) 및 C.E.C.와 매우 높은 상관성(相關性)을 보였으나, 점토함량(粘土含量)과는 뚜렷한 경향(傾向)이 없었다. 각 공시농약(供試農藥)에 대한 흡착(吸着)은 trifluralin이 가장 많았고 다음으로는 linuron, butachlor, bentazon순(順) 이었다. The Freundlich-type adsorption isotherms were obtained in this study on the adsorption of linuron, bentazon, trifluralin and butachlor by soils. A strong correlation was shown between soil organic matter content and the adsorption of linuron. Soils with high organic matter content adsorbed more linuron. There was no significant correlation between the adsorption of bentazon and clay content. There was a tendency that increase in organic matter content acts against the adsorption of bentazon. Repulsive forces seemed to exist between negatively charged soil particle surfaces and betazon molecules which become weakly charged negative ions in soil solution. Organic matter content and cation exchange capacity appeared to be enhancing the adsorption of trifluralin and butachlor. Clay content was not significantly correlated with the adsorption of these herbicides. Trifluralin was adsorptive to the greatest extent, followed by linuron and butachlor, bentazon being the least.
Heptachlor 에 의한 호프식물 및 한삼덩굴의 생육시기별 약해에 관한 연구
한대성,박창규,손철욱,허장현 ( Dae Sung Han,Chang Kyu Park,Chul Uk Son,Jang Hyun Hur ) 한국환경농학회 1993 한국환경농학회지 Vol.12 No.1
This study was conducted to clarify the translocation and the phytotoxicity of soil treated Heptachlor (0.1ppm) and Heptachlor epoxide (0.1ppm) on Hop plants and Hansam vine. Residues in the soils and the plants were analyzed and phytotoxic patterns were investigated at the different growing stages. Photosynthetic rate and chlorophyll contents were measured. The results were summarized as follows: 1. At the second growing stage, 40 days after transplanting, severe damages by Heptachlor were observed on root of Hop. Growth rate on top and root parts of Hop was retarded from the third growing stage, 70 days after transplanting. The damages seemed to be caused by Heptachlor epoxide rather than by Heptachlor. 2. Residues of Heptachlor and Heptachlor epoxide in the plants, Hops and Hansam vine, were high at the second growing stage in comparison with those at the other stages. Residual levels in the plant parts were in order of root> stem> leaf. 3. Inhibition of photosynthetic rate was more serious in Hop plants than those in Hansam vine. The photosynthetic rate was suppressed at the second growing stage by Heptachlor epoxide and greatly reduced at the third growing stage. 4. Chlorophyll contents were not significantly changed in Hops and Hansam vine. Decreasing trends of the chlorophyll contents in both plants treated with the pesticides were similar to those of control plants.
Bentazone 의 약해에 (藥害) 미치는 부식산 (腐植酸) 및 훌브산의 영향
한대성,양재의,신용건 ( Dae Sung Han,Jae E . Yang,Yong Keon Shin ) 한국환경농학회 1993 한국환경농학회지 Vol.12 No.2
This research was conducted to assess the influence of humic or fulvic acid on Bentazone phytotoxicity using a bioassay with hydroponically grown cabbage (Brassica campestris subsp. napus var. pekinensis Makino). Concentrations of Bentazone in the water culture media were ranged from 0 to 32 μM and those of the organic ligands were 1.0mM as a soluble carbon. Media were prepared in a complete factorial combination with pHs of 4.5, 6.5 and 8.5. The phytotoxicity indices on growth rate and dry weight decrement were employed to evaluate the effects of organic ligands on the Bentazone phytotoxicity. Humic or fulvic acid without Bentazone treatment enhanced the growth of cabbage and this effect was evident at low pH of 4.5. Bentazone led to chlorosis and necrosis on cabbage leaves resulting in the decreases of dry and fresh weights and growth rate. This phytotoxic effect was increased with Bentazone concentration and evident at low pH. At pH 4.5, dry weight was decreased about 63% with 8μM of Bentazone treatment. Effective concentration of Bentazone causing 50% decreases in fresh weight as compared to the control was estimated to be 21μM. Presence of organic ligand reduced the phytotoxicity of Bentazone to cabbage significantly by increasing yields and growth rates as compared to the treatment of Bentazone alone. At pH 4.5, fulvic acid reduced phytotoxicity of Bentazone upto 46%, and this efficiency of fulvic acid was better than that of humic acid under the same condition.
한대성,김정제,신영오 한국환경농학회 1984 한국환경농학회지 Vol.3 No.1
土壤에 의한 linuron, bentazon, trifluralin 및 butachlor의 吸着을 나타내는데 있어서 Freundlich adsorption isotherm이 사용되었으며, 實驗結果를 要約하면 아래와 같다. 土壤에 의한 linuron의 吸着은 土壤成分中 有機物의 含量과 직접적인 關係가 있으며, 有機物의 含量이 增加함에 따라 linuron의 吸着도 增加하였다. Bentazon은 土壤有機物이나 粘土의 含量에 따라 뚜렷한 相關이 없었으며, 오히려 有機物含量이 增加됨에 따라 吸着은 減少하는 傾向이었다. 이러한 현상은 bentazon이 土壤溶液中에서 陰荷電을 띠어 bentazon分子와 陰荷電을 띤 土壤表面間의 反撥現象 때문인 것으로 推定되었다. Trifluralin과 butachlor는 土壤有機物含量 및 C.E.C.와 매우 높은 相關性을 보였으나, 粘土含量과는 뚜렷한 傾向이 없었다. 각 供試農藥에 대한 吸着은 trifluralin이 가장 많았고 다음으로는 linuron, butachlor, bentazon順 이었다. The Freundlich-type adsorption isotherms were obtained in this study on the adsorption of linuron, bentazon, trifluralin and butachlor by soils. A strong correlation was shown between soil organic matter content and the adsorption of linuron. Soils with high organic matter content adsorbed more linuron. There was no significant correlation between the adsorption of bentazon and clay content. There was a tendency that increase in organic matter content acts against the adsorption of bentazon. Repulsive forces seemed to exist between negatively charged soil particle surfaces and betazon molecules which become weakly charged negative ions in soil solution. Organic matter content and cation exchange capacity appeared to be enhancing the adsorption of trifluralin and butachlor. Clay content was not significantly correlated with the adsorption of these herbicides. Trifluralin was adsorptive to the greatest extent, followed by linuron and butachlor, bentazon being the least.
한대성,배규현,윤현진 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.4
This study investigates the flow efficiency and temperature based on flow path shape. Five models are designed to the no flow path, one flow path, two flow path, three flow path, add inlet flow path and add interior space gradient. Results show that two flow model(add inlet flow path and add interior space gradient), It was confirmed that model(add inlet flow path) is the optimal shape for coolant heat transfer, and model(add interior space gradient) is the optimal shape for coolant flow, demonstrates optimal design among the five models. The results of this study can be utilized to efficiently control the coolant flow through various types of flow paths.