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주원석(Wonseok Joo),권대복(Daebok Kwon),조경석(Kyungseok Cho),박창호(Changho Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Fuel Cell Stack generates enormous heats in the electrochemical process. Generally, the fuel cell stack operates well at a temperature around 65℃ which is lower than the internal combustion engine in the PEMFC vehicle. By using the engine cooling simulation program, we found that the minimum heat capacity of the stack cooling module and air-flow of the fan. The minimum airflow would be 7000 CMH for the 35㎾ of the heat from the stack. We had developed high voltage BLDC motor with controller and high efficiency heat exchanger to solve the problem. But, the Noise of stack cooling fan is very higher than that of ICE vehicle. so, it is necessary to reduce the noise of fan for application to vehicle. This study will present the improvement process of the Stack Radiator which increases the heat capacity and reduces the noise of cooling fan. In the first stage of development we conduct computer simulation including structure analysis. We made the prototype of the cooling module through the results of simulation. Then the performance test was conducted. The results of calorimeter test show that the developed cooling module meets the severe requirements reducing the noise of the cooling fan.
예열기간중 엔진 실린더 라이너에 대한 비정상 열전달 해석
주원석(W.S.Joo),정인곤(I.G.Jung),박정규(J.K.Park),이재순(J.S.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this study, a two-dimension finite-difference model was developed to predict the temperature distribution of chamber at preheating process. The study consists of a mathematical modeling for the unsteady heat transfer in the cylinder. The temperature distribution of liner for diesel engine was analyzed and measured. The purpose of this study is to analyze temperature distribution of liner by the finite-difference method and to measure temperature distribution for each points.<br/>
장영달,주원석,용홍봉,박용국,장성권,정정수,김유용,Jang, Young-Dal,Ju, Won-Seok,Long, Hong-Feng,Piao, Long-Guo,Jang, Sung-Kwon,Chung, Chung-Soo,Kim, Yoo-Yong 한국축산환경학회 2009 축산시설환경학회지 Vol.15 No.2
일반적으로 올인-올아웃 시스템은 농장에서 양돈 생산성을 개선할 수 있는 최선의 사양관리방법으로 알려져 있으며, 그룹관리 방식은 질병의 전파를 차단하고, 질병 순환 고리를 제거할 수 있는 올인-올아웃 시스템을 자연스럽게 적용할 수 있는 사양 관리 방법 중 하나이다. 그룹관리는 양돈장의 모든 총두수, 돈사 시설 등을 고려하였을 때, 그룹의 크기와 관리 주간의 차이에 따라 다양한 방식이 존재한다. 모돈의 주간관리와 그룹관리 방법은 농장의 상황에 따라 다양한 장단점이 존재하며, 시설과 모돈 수 등을 고려하여 가장 적합한 관리 방법을 농장에 적용하여야 할 것이다. 모돈의 그룹관리는 형태에 따라 2, 3, 5, 7 주간 그룹관리 등으로 나눌 수 있지만, 이중에서도 3주간 그룹관리는 주간관리, 2, 5, 7 주간 관리에 비해 돈군의 흐름과 모돈의 번식 생리를 적절히 활용하고, 관리자의 작업효율을 높일 수 있는 관리 방법이라고 할 수 있겠다. 임신이 되지 않은 모돈은 3주 간격의 발정주기를 갖게 되므로, 이 같은 모돈의 생리를 효과적으로 이용하는 방법이 모돈들을 3주간 그룹관리체계로 관리하는 것이다. 3주간 그룹관리는 모돈의 번식능력 향상은 물론, 전체 양돈장에 올인-올아웃에 의한 사양 관리가 이루어질 수 있도록 하여 PMWS, PRRS, PRDC, PED 등 국내에 만연하고 있는 질병을 예방하고, 유럽의 양돈선진국들에 비해 현저히 낮은 국내의 양돈 생산성을 개선시킬 수 있는 대안이 될 수 있다고 하겠다. Conventionally, many pig producers have utilized a continual sow managements system that the matings, farrowings and weanings are done weekly basis. But this transitional method is not able to cut the cycle of diseases and fully apply all-in/all-out system because of the continuous flow of sows and pigs. Conventional weekly management system is currently limiting in small farm to work efficiently both for workers and pigs. Therefore, pig producers have found novel management methods for applying all-in/all-out system, improving pig health, leading to better growth, lowering mortality and reducing medication costs nowadays. Moreover, all-in/all-out pig management system has known as a strategy for improving productivity in swine farm. The batch system is one of the best management methods to adopt all-in/all-out pig management system that prevent spreading diseases in pig and remove cycle of diseases. Batch farrowing system is a concept for providing a group of sows that delivery within a specific farrowing interval and inducing a large enough scale of piglets to fill the weaner facilities. There are different types of batch farrowing system with batch size and interval of farrowing when several factors at the swine farm are considered such as total number of sows, available facilities in the farm, and the efficiency of workforce. Sow managements such as farrowing, weaning and breeding, every 3 weeks rather than weekly, 2 or 5-week interval have advantages for workers and reproductive cycle of sows as well as pig flow. Because there are several pros and cons both in weekly and batch management system, various factors should be considered to apply the most suitable management system in each individual farm. To improve poor swine productivity in Korea compared to ED, batch system for sows will be an alternative choice which is able to prevent high incidence of diseases in swine farm such as PMWS, PRRS, PRDC and PED because all-in/all-out pig management can be also applied automatically by using this management system.
추영국,주원석,송일찬,박세라,서상영,조진형,민성훈,김대헌,김지수,김순욱,박순주,고기성 한국식물생명공학회 2019 JOURNAL OF PLANT BIOTECHNOLOGY Vol.46 No.3
Production of therapeutic monoclonal antibodies (mAbs) using a plant platform has been considered an alternative to the mammalian cell-based production system. A plant-derived mAb CO17-1AK (mAbP COK) can specifically bind to various types of cancer cell lines. The target protein of mAbP COK is the epithelial cell adhesion molecule (EpCAM) highly expressed in human epithelial cancer cells, including breast and colorectal cancer cells. It has been hypothesized that its overexpression supports tumor growth and metastasis. A ganglioside is extended well beyond the surfaces of the various cell membranes and has roles in cell growth, inflammation, differentiation, and carcinogenesis. However, the regulation of EpCAM gene expression in breast cancers and the role of gangliosides in oncogenesis are unclear. Here, the purpose of this study was to determine the effects of mAbP COK on human breast cancer cell proliferation, apoptosis, and ganglioside expression patterns. Our results show that treatment with mAbP COK suppressed the growth of breast cancer cells and induced apoptotic cell death. It also upregulated the expression of metastasis-related gangliosides in breast cancer cells. Thus, treatment with mAbP COK may have chemo-preventive therapeutic effects against human breast cancer.
이색법을 이용한 직접 분사식 디젤엔진의 화염 온도 및 Soot 분포 측정에 관한 실험적 연구
조성용(Cho S.Y),정수훈(Chung.S.H),주원석(Joo.W.S),박정규(Pakr.J.K) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this study, the flame temperature and KL value distribution in a DI diesel engine were measured by the two-color method. The accuracy of the temperature calibration of the measuring equipment was assured by characteristic curve of film made from a high temperature standard tungsten ramp. First, piston and cylinder of DI diesel engine were elongated and diesel flame in combustion chamber was photographed by a high speed camera on a nega-color film. The two-dimensional temperature and KL value distribution can be calculated from the radiant intensities on a nega-color film by using an image processing. The flame temperature and KL value were measured on various combustion chamber shapes.<br/>