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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.
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.
李南辰,全在根 한국응용생명화학회 1982 Applied Biological Chemistry (Appl Biol Chem) Vol.25 No.4
배추와 3%의 소금물로 담금한 簡易 김치를 사용하여 김치의 液成分만을 分離 瞬間殺菌하고 이것을 再混合하는 殺菌方法에 있어서 適正 反復殺菌回數와 殺菌溫度 및 1回 殺菌時間 등에 관하여 조사하였다. 殺菌效果는 殺菌後 15℃에서 貯藏할대의 pH의 變化를 基準으로 pH 4.3에 到達할 때까지 所要時間의 연장 效果로 하였다. 배추 金치의 最適殺菌條件은 3回 反復殺菌方式에서 81℃이었으며 非殺菌 김치에 比하여 3倍 以上의 저장성을 보였다. 簡易 김치의 殺菌方法과 條件을 양념 김치에 適用하여도 同等한 效果를 얻을 수 있었다. Pasteurization conditions of chinese cabbage-Kimchi were investigated in the Kimchi pasteurizer which sterilized the liquid portion and mixed with that of non-heat treated solid of Kimchi in a constant volume reservoir. The shelf-life of the sterilized Kimchi were compared at various temperature 75, 81, 85℃ and pasteurization cycles numbers of passage through holding section of the pasteurizer for the optimum pasteurization conditions. The optimum temperature were 75℃ for one cycle and 81℃ for 3 cycles. More than two weeks shelf-life of Kimchi was prolonged when pasteurized 3 cycles at 81℃. Similar results were obtained with the seasoned Kimchi containing red pepper powder.
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.