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EMS data 분석 및 최적화 기법을 적용한 제어지역별 목표운전전압 제안
성웅(Ung Sung),김재원(Jaewon Kim),김태균(Taegyun Kim),이병준(Byongjun Lee),정응수(Eungsoo Jung),조종만(Jongman Cho) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
This paper presents target operation voltage guidelines of each voltage control area considering both voltage stability and economical efficiency in real power system. EMS(Energy Management System) data, Real-time simulator, shows not only voltage level but lots of information about real power system. Also this paper performs optimal power flow calculation of three objective functions to propose the best target operation voltage. Objective function of interchange power flow maximum and active power loss minimization stand for economical efficiency index and reactive power reserve maximum objective function represents stability index. Then through simulation result using optimazation technique, the most effective objective function is chosen. To sum up, this paper divides voltage control area into twelve considering electric distance characteristics and estimate for voltage level by the passage of time of EMS peak data. And through optimization technique target operation voltage of each voltage control area is estimated and compare their result. Then it is proposed that the best scenario to keep up voltage stability and maximize economical efficiency in real power system.
조성웅,김도형,양중석,정근욱,백기태,Jo, Sung-Ung,Kim, Do-Hyung,Yang, Jung-Seok,Chung, Keun-Yook,Baek, Ki-Tae 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
The influence of operation time on electrokinetic restoration was investigated to remove salts from sulfate-accumulated greenhouse soil. Operation time is directly related to the process cost, therefore, we determined the relationship between operation time and removal of salts. Nitrate and sodium were removed almost completely within 2 weeks, chloride and calcium was removed in proportion to the operation time. Sulfate was accumulated at the center of anode and cathode. The soil electrical conductivity (EC), an indicator for soil salinity, showed similar shape with the residual sulfate after electrokinetic treatment. The soil EC was not changed after 2 weeks, however, the energy consumption increased with operation time. Based on the experimental results, most salts except sulfate were removed within 2 weeks, but sulfate was not removed during same time period. For the further removal of sulfate, longer operation time is in need.
조정민,조성웅,김도형,양중석,백기태,Cho, Jung-Min,Jo, Sung-Ung,Kim, Do-Hyung,Yang, Jung-Seok,Baek, Ki-Tae 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.5
The electrokinetic transport characteristics of salts were investigated using nitrate and sulfate accumulated saline greenhouse soil. Within 8 days, 95% of nitrate was removed from the soil, while sulfate removal was 19% for 8 days. The low removal of sulfate came from adsorption reaction on the soil particles or organic matter and precipitation with calcium. Divalent cations such as calcium and magnesium were transported toward cathode via electromigration, and most monovalent cation such as potassium was removed. The pattern of residual electrical conductivity was similar with that of sulfate. Based on the results, electrokinetic technique is effective to restore nitrate-accumulated saline soil, but is not effective to restore sulfate-accumulated soil.
공성훈(Kong Sung-Hoon),정재훈(Chung Jae-Hun),정성웅(Jeong Seong-Ung) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.3
There are many sunblocking structures for cultivating plants in Korea. But research results of plants cultivating structures are so limited relating to sunlight shading environment. Major research results are as following : 1) temperature distribution of interior zone is higher than exteriror zone 2) air velocity distribution of inlet zone is higher than exterior zone 3) trand of temperature distribution is unsymmetrical situation by air flow conditions.
염류집적 농경지 탈염을 위한 전기역학적 처리공정의 비용산출
김도형,최정희,조성웅,백기태,Kim, Do-Hyung,Choi, Jeong-Hee,Jo, Sung-Ung,Baek, Ki-Tae 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
In this study, cost analysis of electrokinetic (EK) restoration process for desalination of saline agricultural land was performed for field application based on a pilot scale field application. For reasonable cost analysis, EK process was classified into three major parts: system design, installation and operation. Cost of system installation consists of materials and installation for electrode/electric wire, power supply and data monitoring, drainage system, etc. Operation cost was calculated based on electrical consumption and water charges for EK process. Total cost for EK process was 2,943,013 won for $1000m^2$ in greenhouse area. Cost for system installation was 2,553,786 won, that is, 87% of total cost, while cost for system operation was 389,229 won, that is, 13% of total cost.
고정삼(Jeong Sam Koh),고정은(Jeong Eun Koh),양상호(Sang Ho Yang),안성웅(Sung Ung Ahn) 한국응용생명화학회 1994 Applied Biological Chemistry (Appl Biol Chem) Vol.37 No.3
Soluble solids (。Brix), acid content and vitamin C content of Citrus miyakawa unshiu and C. okitsu unshiu juice harvested middle of November 1993 in Seuho-Dong and Topyung-Dong, Seogwipo-si, south area of Cheju were 10.7∼11.0, 1.04% and 41.19∼44.94 ㎎/100 g juice, respectively. Carbohydrate was consisted of about ½ sucrose, ¼glucose. and ¼ fructose. Fruit weight, peel thickness, soluble solids, pH, acid content and Brix/Acid ratio had a good correlation in linear function with increasing fruit size, respectively. However, hardness and edible part ratio were not showed correlation with increasing fruit size. Middle size of citrus fruit was favorable to panelists, and the citrus peel color of red yellow was more favorable than pale yellow color in sensory evaluation. Sensory evaluation score showed a linear correlation among citrus fruits of C. okitsu unshiu produced in Namwon-ri, Seuho-Dong, Seogwipo-si, south area of Cheju, and that of Chochun-ri, Ara-Dong, Cheju-si, north area of Cheju, and the score was higher according to citrus fruit produced in optimum cultivation area. With increasing Brix/Acid ratio of citrus juice, high sensory evaluation score was gained in panelists. These data obtained are supposed to be applied to the quality evaluation of Citrus unshiu produced in Cheju.
기초 건강검사에 의한 비만여고생의 신체조성ㆍ혈액성분 및 면역기능 분석
남태호,차성웅,오덕자,한성섭 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-
This study intended, through some basic healths test, to find out the body composition, the blood components, and the immune function of the obese high-school girls. With 2 groups of 16 subjects, the eight obese group and the other eight non-obese group, the results are following: 1. In the body composition analysis, its quantity comparison indicates that the obese group shows significance higher than the non-obese group in Body fat and Weight (p<.001). The rate of comparison per weight of body composition tells that the former shows significance lower than the latter in every item(% Water, % Protein, % Muscle, % LBM) except the item % Mineral. (p<.001) 2. In the biochemical serum test, there is much higher significance of the obese group than the non-obese group in TC and TG (p<01), but there is not any significance difference in HDL-C. 3. In the blood test, the significance difference of the obese group is much higher in RBC, Hct, PLT(p<.01) and Hb(p<.05), but not in WBC. 4. In the leucocyte test(WBC diff) to find out their immune function, the obese group shows lower significance difference than the non-obese group only in Monocyte and Eosinophil.(p<.05), but not in Neutrophil, Lympocyte and Bosophil. From the above results, the obese high-school girls seem to have a good nutrient status and show no abnormality in their body composition and blood elements. But the result of WBC diff cannot show clearly the difference between two groups, which tells the need of the further investigation on T-cells and B-cells in lymphocyte.