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실증연구를 위한 주택용 태양열 온수기 모니터링 시스템 개발
양동조,김재열,한재호,송경석,김우진 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
The application of solar energy, in the field of alternative energy, was on the increase tendency. In the case of advanced nations, through continuous R&D, solar hot water heater with high efficiency has been used for the house and the industrial process on business, advanced nations were reached up the experimental stage of solar generation system. But, the actual circumstance of the domestic has been not accomplished the popularization of solar hot water heater and the settlement of it which is the fundamental stage of the solar energy usage. This trouble, the domestic was flooded with small enterprise for producing solar hot water heater, was caused by the popularization and the production without verification of performance. To supply the monitoring program for evaluating solar hot water heater, this research was purpose to improve the technical development of the enterprise for producing solar-heat hot-water-boiler and served as an aid for the enlargement and the popularization on solar energy.
태양에너지 시스템의 실증시험을 위한 모니터링 시스템 개발
양동조(Dong-Jo Yang),김재열(Jae-Yeol Kim),오율권(Yool-Kwon Oh),김진흥(Jin-Heung Kim),정낙규(Nak-Kyu Chung),조금배(Geum-Bae Cho) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
The application of solar energy, in the field of alternative energy, was on the increase tendency. In the case of advanced nations, through continuous R&D, solar hot water heater with high efficiency has been used for the house and the industrial process on business, advanced nations were reached up the experimental stage of solar generation system. But, the actual circumstance of the domestic has been not accomplished the popularization of solar hot water heater and the settlement of it which is the fundamental stage of the solar energy usage. This trouble, the domestic was flooded with small enterprise for producing solar hot water heater, was caused by the popularization and the production without verification of performance. To supply the monitoring program for evaluating solar hot water heater, this research was purpose to improve the technical development of the enterprise for producing solar-heat hot-water-boiler and served as an aid for the enlargement and the popularization on solar energy.
양동석,유성초,김봉수,성현석,이신욱,정재헌,조은상,홍정아 한국물리학회 2009 새물리 Vol.58 No.6
The relationship between the local structure and the magnetic properties for Mechanically - alloyed Fe60Si40 was investigated. The mechanical alloying process was conducted by milling an Fe-Si mixed powder for 1, 2, 4, 6, 12, and 24 hours. The long - range order in the crystalline state was examined by using X-ray diffraction, and the short - range order in the noncrystalline solids was examined by using the extended X-ray absorption fine structure. The diffraction peaks decreased gradually as the milling time was increased. The EXAFS analysis showed that the BCC shells of the Fe cluster decreased gradually and that the local structure was changed completely in 12 hours. We found the reduction in the saturation magnetization to be related to a reduction in the number of Fe-Fe bonds in the local structure. 기계적 합금법으로 제조된 Fe60Si40의 미세구조 및 자기적 특성을 분석하여 구조 및 자기적 특성과의 관련성을 조사하였다. 기계적 합금화 시간은 1, 2, 4, 6, 12, 24이었으며 각 시료의 구조는 XRD 및 EXAFS에 의해 분석되었다. XRD 분석에 의하여 시료의 long range order이 조사되었고, EXAFS에 의하여 시료의 local structure가 조사되었다. XRD 분석 결과 1시간 이내에 시료들의 Si peak들이 현저히 줄어들었다. EXAFS 분석 결과 12시간이 지나면서 시료의 local structure가 바뀌기 시작하여 24시간이 지났을 때 local structure는 최초 시료의 구조와 전혀 다른 구조가 관측되었다. 이것으로 기계적 합금법에 의하여 Fe60Si40 합금이 12시간에 형성됨을 확인하였다. 시료의 자기적 특성은 VSM에 의해 측정되었고 시료의 자화는 기계화합금 시간이 경과함에 따라 점차 감소하였고, 기계화 합금 시간이 12시간 경과하였을 때 시료의 자화 값은 거의 변화하지 않는 것을 관측하였다. EXAFS 분석 결과 포화자화 값의 감소와 local structure에서 Fe-Fe결합의 감소와 밀접한 관련이 있음을 확인하였다.
2차원 열간 단조에서의 변형과 온도의 연계 해석과 비연계 해석 비교
조종래,박치용,천명식,윤정호,양동열 대한기계학회 1990 대한기계학회논문집 Vol.14 No.4
본 연구에서는 위와 같은 열 점소성 해석의 여러 수치해석 기법을 첫째, 변형 과 온도 해석을 연계 방식과 비연계 방식으로 계산한 후 결과를 검토하고, 둘째, 온도 해석을 유한 요소법과 유한 차분법으로 계산한 후 각각의 장단점과 효율적 방법을 검 토하는데 목적이 있다.또한 이 결과로 계속적인 3차원 열 점소성 해석 연구수행의 기초를 마련하고자 한다.
Antibody Response in Korean Raccoon Dogs Inoculated with Inactivated Rabies Vaccines
양동군,고태오,남영희,김하현,조수동,이경우,최성숙,송재영 대한미생물학회 2012 Journal of Bacteriology and Virology Vol.42 No.3
Since sylvatic rabies was first identified in South Korea in 1993, over three million bait vaccine doses have been distributed to rabies risk regions in order to block transmission of rabies among wild animals. New progressive strategy is needed to eliminate sylvatic rabies completely in rabies risk regions. Before applying the preventive program related to eradication, immunogenicity of inactivated rabies vaccines available in Korea has to be evaluated in Korean raccoon dogs (Nyctereutes procyonoides koreensis). Six groups of raccoon dogs in wild rescue center of Gyeonggi-do were vaccinated intramuscularly with single dose of six inactivated commercial rabies vaccines (designated A to F). Serum samples at the time of vaccination, and two and four weeks post vaccination were obtained and analyzed by virus neutralizing assay (VNA). All raccoon dogs inoculated with vaccines C, D, E or F, showed VN antibody titers ranging from 0.5 to 13.77 IU/ml. Half of four raccoon dogs immunized with vaccine B revealed VN titer over 0.5 IU/ml, and one of four raccoon dogs inoculated with vaccine A showed protective antibody titer. This finding suggests that most of the commercially available inactivated rabies vaccines could induce protective immunity in Korean raccoon dogs and be applicable to new rabies control program.
조종래,양동열 대한기계학회 1987 대한기계학회논문집 Vol.11 No.3
본 연구에서는 냉간 축대칭 전방 압출에 가중잔류항법을 적용하여 재료의 가 공 경화 및 강소성 경계를 고려하는 프로그램을 개발하여 변형도, 응력, 변형력, 강소 성 경계등을 FEM과 동일한 조건에서 비교 해석하고 다른 공정에 적용할 수 있게 하고 또한 곡면다이와 원추형다이를 설계 제작하여 다이의 형상과 단면 감소율이 변형도와 응력 분포에 미치는 영향을 검토하고 압출된 제품의 성질을 분석하여 실제 공정에 이 바지하며 이론 계산과 실험을 비교함이 목적이다. The paper is concerned with the analysis of axisymmetric forward extrusion by using the method of weighted residuals. In the method of weighted residuals, the flow function and the stress functions are assumed so as to cover the global control volume. The derived stress and strain components are used to formulate a constitutive equation in the error form, so that the error is minimized to determine the stress and strain components. The method of least squares is then chosen for the minimization of errors. The distribution of stresses and strains and the forming load are determined for the workhardening material considering the frictional effect at the die surface. The computed results are very similar to those obtained by the finite element method. The method is simpler in application and requires less computational time than the finite element method. Experiments are carried out for aluminum and steel specimens using curved dies. It is found that the experimental observation is mostly in agreement with the computed results by the method of weighted residuals.