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정우철,이정태,강석중,최병대,Jeong, U-Cheol,Lee, Jeong-Tae,Palmos, Grace N,Kang, Seok-Joong,Choi, Byeong-Dae 한국생명과학회 2007 생명과학회지 Vol.17 No.9
Effects of muscle fluid concentrates from Styela clava on fish diets were investigated in rainbow trout(Oncorhynchus mykiss). Fish were fed on one of the isonitrogenous(48%) and isolipic(20%) feed containing 5 to 20% of muscle fluid concentrates for 8 weeks. Hematological parameters such as hemoglobin, hematocrit, albumin, glucose, total bililubin, triglyceride and glutamic pyruvate transaminase of the rainbow trout which were fed on the diets varied, but no specific trend became apparent. However, glutamic oxaloacetic transaminase value was significantly higher than that of normal fishes. Therefore, concentrated ascidian fluid which is normally discarded, can be combined with commercial diets for the normal growth of rainbow trout.
물벼룩(Moina macrocopa) 급여가 조피볼락(Sebastes schlegeli) 자어의 성장에 미치는 영향
정우철 ( U-cheol Jeong ),( Feng Jin ),최종국 ( Jong- Kuk Choi ),이정태 ( Jeong-tae Lee ),최병대 ( Byeong-dae Choi ),강석중 ( Seok-joong Kang ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.2
Several our studies have focused recently on the mass production of the freshwater Cladoceran Moina macrocopa which can substitute Artemia nauplii for the culture of larval marin fish. A 6 weeks experiment was conducted to investigate the effects of enrichment on the fatty acid composition of Moina macrocopa through feeding Schizo-chytrium sp. containing highly unsaturated fatty acids and to study the impacts of n-3-HUFA enriched Moina on improving survival rate and fatty acid compostion of larval rockfish Sebastes schlegeli. After feeding for 6 weeks, the Moina-fed fry resulted in a higher survival rate of 99.2% compared to the Artemia-fed fry 12.8%. In addition, the Moina-fed fry had the fast growth rate 45.6mm compare to the Artemia-fed fry 25.7 mm at the end of the experiment. The Moina-fed fry showed significantly higher level of 16.47% DHA than their Artemia-fed fry counterparts of the level of 3.97% with respect to DHA. PL, the cell membrane components in living food organisms, constituted 63.8% of the Moina, which was significantly higher than in the 40.1% of the Artemia. The present study indicate that Moina macrocopa can be used as Artemia substitute and improving the survival rate rockfish larvae through enchriment Schizochytrium sp.
정우철(Woo-Cheol Jeong),김영용(Yeong-Yong Kim),김주현(Joo-Hyun Kim) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
본 논문은 모터(Motor)에서 발생된 구동력을 기어열(gear train)를 통해 리드스크류(lead-screw)로 전달하고 리드스크류(Lead-screw)의 추력을 시프트포크(shift fork)로 전달하여 최종적으로 시프트포크(shift fork)를 구동시키는 액추에이터(Actuator) 시스템 모델 개발에 대한 과정 및 결과이다. 시프트포크의 구동을 통해 차량의 전륜과 후륜의 동력분배를 가능하게 하는 액추에이터(actuator)이다. 설계 이전에 설계파라메터 및 컨셉에 대한 검증을 통해 개발기간단축 및 시스템에 대한 설계파라메터검증을 기대할 수 있으며 더 나아가 향후 모델을 통한 시스템검증에 적용 가능한 모델을 구축하므로써 향후 유사 시스템개발시보다 생산성 있는 개발시스템을 구축할 수 있다.