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발아시험 및 생체 축적량 분석을 통한 카드뮴의 생태 독성 평가
오세진 ( S. J. Oh ),위민아 ( M. A. Wiw ),윤현수 ( H. S. Yun ),김성철 ( S. C. Kim ),양재의 ( J. E. Yang ),옥용식 ( Y. S. Ok ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2012 강원 농업생명환경연구 Vol.24 No.1
Adverse effect of heavy metals on human health has been awarded and consequently, conducting ecological risk assessment (ERA) for heavy metals is necessary. In this study, cadmium (Cd) was evaluated for assessing ecological toxicity with germination test and its bioaccumulation into crops. Three different crops, carrot (Daucus carota), chinese cabbage (Brassica campestris var. chinensis) and green onion (Allium cepa) were used for germination test and bioaccumulation amount of Cd in each crop. Result showed that concentration of IC50 (Inhibited concentration) was ordered as carrot (60 mg-Cd/L) > chinese cabbage (45 mg-Cd/L) > green onion(25 mg-Cd/L). Based on spiked Cd concentration and bioaccumulated Cd concentration in each crop, biological transfer factor (BTF) was calculated. BTF value for carrot, green onion, and chinese cabbage was 5.2-12.3, 1.2-3.8 and 14.8-32.1 respectively. This result might indicate that green onion is sensitive to Cd toxicity making resistant to Cd accumulation while less resistance was observed for Cd in chinese cabbage.
토양호흡 간이 측정기를 이용한 광미와 산림토양의 질적 평가
김성철 ( S. C. Kim ),김유범 ( Y. B. Kim ),오세진 ( S. J. Oh ),이상필 ( S. P. Lee ),주진호 ( J. H. Joo ),양재의 ( J. E. Yang ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.4
Soil respiration is a key component of the global carbon cycle but limited research has been conducted to examine the biological parameters of soil quality. Thus, The objectives of this research were to develop a simple, easy, and cost-effective standard kit to assess soil respiration and to estimate correlation between soil properties and soil respiration. For the standard kit to assess soil respiration, an ideal reactive substance was selected based on pH range. Depending on color development of the gel containing the reactive substance, soil respiration state was rated representing:<45 mg/kg/day (dark green), 45-70 mg/kg/day (green), 70-140 mg/kg/day (yellowish green), 140-300 mg/kg/day (yellow),>300 mg/kg/day (orange). Soil samples collected from two different sites (tailing and forest soils) were investigated for chemical (pH1:1, EC1:1, total organic C, and Total nitrogen, Melich 3 extractable P, and Melich 3 extratable K) and biological (Microbial C, Microbial N, Potentially mineralizable N) properties and clustered by the standard kit for soil respiration. While soil respiration level of tailings measured with kit generally ranked Group I and II representing low or moderately low soil activity, forest soils were ranked Group III and IV representing medium and ideal soil activity. Among other physicochemical properties of soil, total organic carbon (ρ=0.81) for tailing and EC1:1 (ρ=0.87) for forest soil were the most correlated parameters with soil respiration. Within biological properties, Microbial mass C (ρ=0.86 for tailing and ρ=0.80 for forest soil) showed the most correlated parameter with soil respiration. Overall, soil respiration assessment kit might have a potential to be used as a tool for quality assessment of soil biological indicators.
$CaNi_{5}$ 및 MG-$CaNi_{5}$ 전극의 퇴화거동에 미치는 불화처리의 영향
이창래,오세진,강성군,Lee, C.R.,Oh, S.J.,Kang, S.G. 한국재료학회 1999 한국재료학회지 Vol.9 No.6
Effects of the fluorination in the $K_2$TiF\ulcorner solution and in-situ KF+ KOH electrolyte on the electrochemical charge-discharge properties of CaNi\ulcorner and the Mg-CaNi\ulcorner electrodes were investigated. In-situ fluorination in the KF+ KOH electrolyte compared with pre-fluorination in the$ K_2$TiF\ulcorner solution could improve the electrochemical cycling durability of CaNi\ulcorner and MG-CaN\ulcorner electrodes. The fluorinated layer on the alloy surface by pre-fluorination to improve the activity and anti-corrosion of the electrodes was dissolved in the pure KOH electrolyte during the cycling. The fluorinated layer was formed continuously on the surface of the electrode by thee2N KF addition in the 6N KOH electrolyte. The excess F\ulcorner ion addition in KOH electrolyte could improve the electrochemical cycling durability of CaNi\ulcorner and Mg-CaNi\ulcorner electrode. But, in case of MG-CaNi\ulcorner electrode, the discharge capacity of the electrode was reduced and the poor cycling property was shown with increasing of the MG process times.
이동국(D-G Lee),오세진(S-G Oh),김종수(J-S Kim),김경호(G-H Kim),김성환(S-H Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
This paper describes how an Artificial Neural Network(ANN) can be employed to improve a speed estimation in a vector controlled induction motor drive. The system uses the ANN to estimate changes in the motor resistance, which enable the sensorless speed control method to work more accurately. Flux Observer is used for speed estimation in this system. Obviously the accuracy of the speed control of motor is dependent upon how well the parameters of the induction machine are known. These parameters vary with the operating conditions of the motor; both stator resistance(Rs) and rotor resistance(Rr) change with temperature, while the stator leakage inductance varies with load. This paper proposes a parameter compensation technique using artificial neural network for accurate speed estimation of induction motor and simulation results confirm the validity of the proposed scheme.