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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.
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.
공공공사의 설계오류 방지를 위한 실시설계도서 검토서 개발
이남진,손명진,김지훈,지성민,현창택,Lee, Nam-Jin,Son, Myung-Jin,Kim, Ji-Hoon,Ji, Soung-Min,Hyun, Chang-Taek 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2
The drawing and specifications for realizing an architectural design require care so that no data would be missed and so that equality can be maintained between the design and specifications or material bills. Still, drawing and specification errors occur for various reasons, including incomplete discussion between the designers of each section, the designer's lack of construction experience, and insufficient review of the interface by each work section. These design errors are the main reasons for the need to redesign at the construction stage and raise problems for various participants in the construction project. Despite the foregoing, the detailed tool for reviewing the design, specifications, and material bills before the construction stage is insufficient, and even the design checklists from large design companies lacks details for proper utilization. Thus, this study was conducted to develop a drawing and specification checklist to prevent design errors in public construction projects and to provide peer review of the design, specifications, material bills, and screen design errors in the finished work for building construction projects with frequent mistakes.