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과일폐기물을 이용한 DEFC용 바이오에탄올 제조 및 특성에 관한 연구
이남진,김현수,차인수,최정식 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.2
This study discribes performance of DEFC (Direct Ethanol Fuel Cell) utilized bio-ethanol based on fruit wastes. To produce the bio-ethanol, fruit wastes were treated at temperature 120℃ and 90minutes in acid pre-treatment. After pre-treatment was done, alcohol fermentation process was running. Initial alcohol concentration was 5%. Using the multi coloumn distillation system, more than 95% ethanol was distilled and each component of bio-ethanol was analyzed. In DEFC performance test, it was revealed that cell performance was much higher than that of ethanol. Comparing ethanol with mixed fuel (bio-ethanol (10%)+ ethanol (90%)), the performance of ethanol was higher than that of mixed fuel. Even though the bio-ethanol from the fruit wastes is corresponded with transport ethanol standards, it thought that organic matter in bio-ethanol could be negative effect on fuel cell.
이남진,이정원,고영규,황성수,강종구 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.3
This study was conducted to investigate whether administration of IH901, a ginseng intestinal metabolite, ameliorates exercise-induced oxidative stress while preserving antioxidant defense capability in rat skeletal muscles and lung. Eight adult male Sprague-Dawley rats per group were randomly assigned to the resting control, exercise control, resting with IH901 (25, 50, and 100 mg/kg) consumption (R/IH901), or exercise with IH901 (25, 50, and 100 mg/kg) consumption (E/IH901) group. The trained groups ran 35 min 2 days/week for 8 weeks. To analyze the IH901-training interaction, serum biochemical analysis, lipid peroxidation, citrate synthase, protein oxidation, antioxidant and superoxide dismutase in skeletal muscles and lung tissue were measured. Compared to the exercise control group, animals that consumed IH901 had significantly increased exercise endurance times (p < 0.05) and decreased plasma creatine kinase and lactate dehydrogenase levels (p < 0.05), while those in the E/IH901 groups had increased citrate synthase and anti-oxidant enzymes and decreased lipid peroxidation and protein oxidation (p < 0.05). In conclusion, IH901 consumption in aging rats after eccentric exercise has beneficial effects on anti-inflammatory and anti-oxidant activities through down-regulation of pro-inflammatory mediators, lipid peroxidation, and protein oxidation and up-regulation of anti-oxidant enzymes.
The physical properties of several HTS coated conductors
이남진,오상수,송규정,하동우,김호섭,하홍수,고락길,김태형,김상철,유권국,문승현,염도준 한국초전도.저온공학회 2007 한국초전도저온공학회논문지 Vol.9 No.4
The superconducting properties of several HTS coated conductors (CC), which had different tape structures, fabricated by KERI, X and Y institutes were compared. We have fabricated the high-Jc SmBCO CC, which has 273.5 A/cm, 1.2 MA/cm2 and 93.5 K for Ic, Jc and Tc-zero, respectively, using the EDDC (Evaporation using Drum in Dual Chambers) process. Both X and Y institutes CCs, however, were purchased. The n-values of KERI, X and Y institutes CCs are 58.5, 40.7 and 31.5 in V = 1 ~ 10 μV criterion, respectively. The in-field properties of Ic at 77 K were investigated and the Jc(B)/Jc(0G) at 0.5 T with B⊥ab-plane are 0.31, 0.19 and 0.24 for KERI, X and Y institutes CCs, respectively. From the Ic-θ-B measurement, we observed that the ab-plane of ReBCO phase was tilted for the ab-plane of substrate in the KERI and X institutes CCs. The tilted angle is about 5 degree. We confirmed that the peak shift (as an inclined texture) was observed by X-ray (102) pole figures of the SmBCO for the KERI CC.
Sliding Mode Control for Wheel Slide Protection in Railway Vehicles with Pneumatic Brake Systems
이남진,강철구 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
Railway vehicles are the most commonly used means of public transportation systems, and therefore, it is essential to ensure their safe operation. To ensure reliable brake performance even on impaired tracks, a wheel slide protection device (WSP) is fitted to the brake system to prevent the wheels from locking and thus reduce excessive sliding. In this study, a sliding mode control (SMC) algorithm for a pneumatic brake system is proposed. The proposed algorithm basically conforms to SMC theory and the sampling time is divided into three sections, namely, the command section, response section, and monitoring section. The SMC determines the duty time for the WSP valve command, operates on a limited command section, and then waits for the brake state to stabilize through the response section. The benefits of this control strategy are that it can use a simplified mathematical model of a pneumatic valve on the model-based SMC and modify the continuous command type for the WSP valve instead of a discrete mode command. The proposed algorithm was verified through experiments with a brake hardware-in-the-loop simulation system for a railway vehicle.