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전차륜 조향 장치를 장착한 굴절궤도 차량의 주행특성에 관한 연구
이수호(Lee Soo-Ho),문경호(Moon Kyung-Ho),전용호(Jeon Young-Ho),박태원(Park Tae-Won),이정식(Lee Jung-Shik),김덕기(Kim Duk-Gie) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The bi-modal tram guided by the magnetic guidance system has two car-bodies and three axles. Each axle of the vehicle has an independent suspension to lower the floor of the car and improve ride quality. The turning radius of the vehicle may increase as a consequence of the long wheel base. Therefore, the vehicle is equipped with the All-Wheel-Steering(AWS) system for safe driving on a curved road. Front and rear axles should be steered in opposite directions, which means a negative mode, to minimize the turning radius. On the other hand, they also should be steered in the same direction, which means a positive mode, for the stopping mode. Moreover, only the front axle is steered for stability of the vehicle upon high-speed driving. In summary, steering angles and directions of the each axle should be changed according to the driving environment and steering mode. This paper proposes an appropriate AWS control algorithm for stable driving of the bi-modal tram. Furthermore, a multi-body model of the vehicle is simulated to verify the suitability of the algorithm. This model can also analyze the different dynamic characteristics between 2WS and AWS.
유기산전해질을 이용한 접촉 글로우 방전 전기분해공정에서 후코이단의 저분자화
차성한 ( Seong Han Cha ),이정식 ( Jung Shik Lee ),김영숙 ( Young Suk Kim ),박권필 ( Kwon Pil Park ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
접촉글로우방전 전기분해(CGDE)에 의한 후코이단의 저분자화에 대해 연구하였다. CGDE 공정 후에 후코이단을 기능성 식품재료로 사용하기 위해 유기산을 전해질로 사용하였다. 실험결과 유기산을 이용한 전기분해에 의해 후코이단의 분자량을 효과적으로 감소시킴을 보였다. 전해질의 농도가 증가하면 글로우방전 시작 전압이 감소하고 글로우방전 시작 전류는 증가하였다. 반응시간에 따른 후코이단의 분자량 변화로부터 저분자화반응은 1차 반응속도 식을 따름을 보였다. 유기산을 이용한 CGDE에 의해 후코이단의 분자량이 처음의 약 1/77로 감소하였으며, CGDE 저분자화 과정에서 유리된 황산기 함량이 작았다. Depolymerization of fucoidan induced by contact glow discharge electrolysis(CGDE) was investigated. To utilize fucoidan as a functional food material after CGDE, organic acids were used as a electrolyte in CGDE process. Experimental results showed that CGDE using organic acid reduced the molecular weight of fucoidan effectively. As electrolyte concentration increased, onset voltage of glow discharge decreased and onset current of glow discharge increased. From the variation of molecular weight of fucoidan with the reaction time, it was demonstrated that the degradation of fucoidan followed a first-order rate law. Molecular weight of fucoidan treated with CGDE using organic acid was about 77 times lower compared to initial fucoidan with little free sulfate.
박권필 ( Kwon Pil Park ),신수철 ( Soo Cheol Shin ),안명원 ( Myeong Won Ahn ),이정식 ( Jung Shik Lee ),김영숙 ( Young Suk Kim ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
Extraction process of fucoxanthin from Undaria pinnatifida and stability of fucoxanthin was studied. In this study, to utilized extracted components as a functional food material, ethanol was used as a solvent. The maximum concentration of fucoxanthin was obtained when 80% ethanol solvent was used. The extraction yield of fucoxanthin increased as extraction temperature raised to 50℃Water washing of raw material for 5 minutes reduced the salt content about 94%. From the experiment that fucoxanthin content reduced by 30% for 1 day storage at 70℃, it was demonstrated that fucoxanthin was thermal-unstable above 70℃. And experimental result of light- stability showed that fucoxanthin was very unstable with light.
천지연 ( Ji Yeon Chun ),차성한 ( Cha Seong Han ),이정식 ( Jung Shik Lee ),김영숙 ( Young Suk Kim ),박권필 ( Kwon Pil Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Laminaria roots have not been practically used in Korea. In this study, the extraction process of carbohydrates and minerals from Laminaria roots was investigated and the properties of extracted components were measured. Hydrochloric acid generally used in carbohydrate extraction from seaweeds in order to obtain high extraction yield. But in this work, to utilize extracted components as a functional food material, organic acids such as citric acid were used, Organic acid as extraction solvent has low extraction yield compared to strong acids, Therefore optimum condition for maximum yield was investigated in carbohydrate extraction from Laminaria roots using organic acid, We measured the extraction yields of carbohydrate with variation of extraction temperature, extraction time, concentration of organic acid and particle size of samples. The extraction yield increased as the particle size decreased and temperature became high. The extraction yield was 19.0 wt% after 4.0 hours extraction with 0.2 wt% citric acid at 100˚C. Potassium concentration was high compared other minerals in extraction solution, that is, the ratio of K/Na was about 3.0. Fucoidan from Laminaria roots had same carbohydrate composition and lower molecular weight compared that of Undaria pinnatifida.
차성한 ( Seong Han Cha ),인명원 ( Myeong Won Ahn ),이정식 ( Jung Shik Lee ),김영숙 ( Young Suk Kim ),김동욱 ( Dong Uk Kim ),변태강 ( Tae Gang Byun ),박권필 ( Kwon Pil Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Properties of fucoidan used for functional cosmetic ingredients and the effect of fucoidan molecular weight on the cosmetic functions were studied. Fucoidan was extracted from Undaria pinnatifida sporophylls and molecular weight (35~160kDa) of fucoidan was controlled by contact glow discharge electrolysis (CGDE). To test possibility of fucoidan as a cosmetics material, tyrosinase inhibition property, water-holding property, elastase activity inhibition property and DPPH free radical scavenging property were measured. Water-holding property of fucoidan was higher than that of hyaruronic acid, which is known as the one of the best water-holding material. The water-holding strength of fucoidan slightly increase as molecular weight of fucoidan decrease, Elastase activity inhibition (anti wrinkle effect) of fucoidan was higher than that of adenosine using standard material for anti wrinkle test. Optimum molecular weight of fucoidan to obtain highest tyrosin inhibition effect, elastase inhibition effect and radical scavenger effect is 100kDa.