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- 저자 : 조경석(Kyung-seok Cho) (검색결과 19 건)
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박창호(Park, Chang-Ho),조경석(Cho, Kyung-Seok),김우준(Kim, Woo-June),오창훈(Oh, Chang-Hoon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
FCEV uses electric energy generated from the reaction between Hydrogen and Oxygen in fuel cell stack as driving force. As fossil fuels are exhausted, fuel cell is regarded as a potent substitute for next generation energy source, and thus, most of car-makers make every efforts to develop fuel cell electric vehicle (FCEV). In addition, fuel cell is also beneficial in aspect of environment, because only clean water is produced during chemical reaction process instead of harmful exhausted gas. Generally, Hydrogen is supplied from high-pressured fuel tank, and air blower (or compressor) supplies Oxygen by pressurizing ambient air. Air blower which is driven by high speed motor consumes about 7{sim}8% of energy generated from fuel cell stack. Therefore, the efficiency of an air blower is directly linked with the overall performance of FCEV. This study will present developing process of an air blower and its consisting parts respectively.
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임상 : 쥐 골수 기질 세포의 면역 효과 세포로의 활성화
김효창 ( Hyo Chang Kim ),강석구 ( Seok Gu Kang ),전신수 ( Sin Soo Jeun ),유도성 ( Do Sung Yoo ),허필우 ( Pil Woo Huh ),조경석 ( Kyung Souk Cho ),김달수 ( Dal Soo Kim ),박춘근 ( Chun Kun Park ) 대한뇌종양학회 2006 대한뇌종양학회지 Vol.5 No.1
Object:Marrow stromal cells(MSCs) have been shown to have the capacity of orthodox and unorthodox plasticity. In this study, the authors tried to differentiate MSCs into immune effector cell and also to access in vitro cytotoxicity of MSCs from rat. Methods:Rat MSCs(rMSCs) were isolated by standard methodology and were activated by interleukin-2(IL-2), interleukin- 15(IL-15), colony stimulating factor GM-CSF, and combinations. Phenotypes of these various activated cells were determined using flow cytometry. The secreted protein from effector cells was estimated by enzyme-linked immunosorbent assay. Cytotoxicity of rMSCs and activated rMSCs against the target cells(9L rat glioma cell line) were estimated using visual survival cell assay. The expression of immune response related genes in activated cells was measured. Results:After various cytokines activation of rMSCs, the population of immune effector cells(CD8, CD161a) and immune reaction related proteins(IL-4, γ-INF) were increased. There was a significant cytotoxicity of rMSCs activated with various cytokine combinations. Apoptosis may be one of the lysis mechanism of target cells by activated rMSCs. The contributing genes could be γ-INF, FasL and perforin. Conclusion:This study suggests that rMSC may differentiate into immune effector cells and have cytotoxic capability against malignant glioma cells. However, we have to investigate orthotopic animal study for the proper translation.
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김우준(Kim, Woo-June),박창호(Park, Chang-Ho),지용준(Jee, Yong-Jun),조경석(Cho, Kyung-Seok),김영대(Kim, Young-Dae),박세영(Park, Se-Young),오창훈(Oh, Chang-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
FCEV uses electric energy generated from fuel cell stack, thus all consisting parts must be re-designed to be suitable for electricity based system. Cathode air blower which supplies compressed air into fuel cell stack has similar shape of turbocharger, but a radial turbine of traditional turbocharger is removed and high speed BLDC motor is installed . Generally, maximum 10% of electric power of fuel cell stack is consumed in air blower, therefore an effective design of air blower can improve the performance of FCEV directly. This study will present an aerodynamic design process of an air blower and compare computational results with experimental data.
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양현섭(Hyun Sup Yang),권대복(Dae Bok Kwon),조경석(Kyung Seok Cho),이창하(Lee Chang Ha) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper presents noise reduction FCEV (Fuel Cell Electric Vehicle) turbo type Air Blower. Noise of centrifugal air blower consists of the aerodynamic noise , resonance of the rotor, electromagnetic noise of a motor, bearing failure noise. Conducted test and analysis in order to improve the noise of the initial sample was measured. Through the test, rotor resonant mode, rotor unbalance, case resonance, and bearing problems as the cause of the noise was classified. Have found ways to resolve the problem, improved designs were considered and through the test, verify improved design.
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김우준(Kim, Woo-June),박창호(Park, Chang-Ho),조경석(Cho, Kyung-Seok),오창훈(Oh, Chang-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
FCEV uses electric energy which generated from the reaction between Hydrogen and Oxygen in fuel cell stack as driving force. As fossil fuels are exhausted, fuel cell is regarded as a potent substitute for next generation energy source, and thus, most of car-makers make every efforts to develop fuel cell electric vehicle (FCEV). In addition, fuel cell is also beneficial in aspect of environment, because only clean water is produced during chemical reaction process instead of harmful exhausted gas. Generally, Hydrogen is supplied from high-pressured fuel tank, and air blower (or compressor) supply Oxygen by pressurizing ambient air. Air blower which is driven by high speed motor consumes about 7{sim}8 % of energy generated from fuel cell stack. Therefore, the efficiency of an air blower is directly linked with the performance of FCEV. This study will present the development process of an air blower and its consisting parts respectively.
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