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박광진,이상환,손병진,Park, Kwang-Jin,Lee, Sang-Hwan,Son, Byung-Jin 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.2
This study is on the performance prediction and design of a sirocco fan. Slip coefficient is very important factor for the performance analysis of a centrifugal-type fan. Because generally used slip coefficient equations of backward curved centrifugal fan are not appropriate for forward curved sirocco fan, in this study a proper slip coefficient equation for a sirocco fan is suggested. Using this equation performance prediction program for sirocco fan is composed of and also included the total noise prediction that include the turbulent noise at the fan inlet and boundary layer noise. A comparison between the values obtained from performance prediction program and experimental values shows that the program predicts the sirocco fan performance in a practical rate.
박광진,이창보,김정현,백승욱,배중면,Park, Kwang-Jin,Lee, Chang-Bo,Kim, Jung-Hyun,Baek, Seung-Wook,Bae, Joong-Myeon 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
IT-SOFC(중저온형 고체산화물 연료전지)의 공기극으로 적합한 PSCF3737의 물질 특성을 파악하고 그 특성을 이용하여 낮은 ASR을 갖기 위한 소결 온도 및 두께 최적화에 관한 연구를 수행하였다. 분말 사이즈 및 상형성을 고려할 때 GNP 방법으로 합성된 분말의 하소 온도는 $1000^{\circ}C$가 적합함을 알 수 있었다. 산소 분압에 따른 ASR 변화 실험을 통하여 PSCF3737의 저항 성분을 전극 자체의 특성과 관련된 중간 주파수 대역(${\sim}10^2Hz$)과 산소의 확산에 영향 받는 낮은 주파수 대역(${\sim}10^{-1}Hz$) 2가지로 분류할 수 있었다. 공기극의 특성 실험을 통하여 소결 온도는 $1200^{\circ}C$가 가장 적합하며 공기극의 두께는 2번 스크린 프린팅 된 $27\;{\mu}m$가 가장 적합함을 알 수 있었다. 이를 토대로 EIS 측정을 하면 $700^{\circ}C$에서 $0.115\;{\Omega}cm^2$의 낮은 ASR값을 얻을 수 있었다. [ $PSCF3737(Pr_{0.3}Sr_{0.7}Co_{0.3}Fe_{0.7}O_3)$ ] is a good candidate cathode material for IT-SOFC(intermediate temperature solid oxide fuel cell) because of high MIEC(mixed ionic electronic conductor) conductivity. In this study, the characteristics of PSCF3737 was investigated and optimizations of sintering temperature and thickness for $PSCF3737(Pr_{0.3}Sr_{0.7}Co_{0.3}Fe_{0.7}O_3)$ was carried out. Impedance responses were divided into two parts by frequency region. Middle frequency part (${\sim}10^2\;Hz$) was concerned with oxygen reduction reaction on surface and low frequency part (${\sim}10^{-1}\;Hz$) was related with oxygen diffusion. The reasonable sintering temperature and thickness of cathode were $1200^{\circ}C$ and about $27\;{\mu}m$ with regard to EIS(electrochemical impedance spectroscopy). ASR(areas specific resistance) of optimized cathode is $0.115\;{\Omega}\;cm^2$ at $700^{\circ}C$.
중.저온형 고체산화물 연료전지에서 연료로 공급되는 CO 와 H<sub>2</sub> 가 성능에 미치는 영향
박광진,배중면,Park, Kwang-Jin,Bae, Joong-Myeon 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.12
The performance behavior of solid oxide fuel cell using $H_2$ and CO as fuels was investigated. The power densities and impedance results showed a little variation as the ratio of $H_2$ and CO changed. However, when the pure CO was used as a fuel, area specific resistance (ASR), especially low frequency region, was increased. This might be due to carbon deposition on anode. The maximum power density was 60% lower using CO than using $H_2$. Carbon deposition reduced after constant current was applied. The SOFC performance was recovered from the carbon deposition after applying constant current during 100h.
한우에 있어서 농후사료 급여 수준이 비육효과에 미치는 영향
박광진,지설하 ( Kwang Jin Park,Sul Ha Chee ) 한국축산학회 1977 한국축산학회지 Vol.19 No.5
This study was carried out to find out the optimum level of concentrates to be allowed for the fattening Korean native bulls. Twenty five bulls were used for this trials at Yesan, Chungnam province for 7 months from July. 1976 to February, 1977. Rughages were fed ad libitum and concentrates was allowed at the levels of 0, 0.5, 1.0, 1.5 and 2.0% on body weight. The results obtained from this study were as follows: 1. The final weight of fattened bulls were 303.4, 361.2, 398.5, 422.3 and 456.0㎏ by the different levels of concentrates as 0, 0.5, 1.0, 1.5 and 2.0% of body weight, respectively. The finished body weights were significantly different from the different level of concentrates (P$lt;0.01). 2. The amount of DCP required for 1㎏ of body gain were 0.94, 0.73, 0.80, 0.87 and 0.85㎏ with the concentrates levels of 0, 0.5, 1.0, 1.5 and 2.0%, respectively. The amount of TDN required for 1㎏ of body gain were 12.40, 7.15, 7.23, 8.27 and 7.20㎏, respectively, in order of concentrates levels to be allowed. There was a tendency that feeds efficiency was the highest at the 0.5% of concentrates level among the different levels of concentrates to be fed. 3. The chilled carcass percentages were 52.4, 54.7, 57.1, 59.2 and 60.2% respectively with the levels of concentrates to be fed as 0, 0.5 10, 1 1.5 and 2.0% on live weights. The chilled carcass percentages were increased by the high levels of concentrates to be allowed. This study was carried out to find out the optimum level of concentrates to be allowed for the fattening Korean native bulls. Twenty five bulls were used for this trials at Yesan, Chungnam province for 7 months from July. 1976 to February, 1977. Rughages were fed ad libitum and concentrates was allowed at the levels of 0, 0.5, 1.0, 1.5 and 2.0% on body weight. The results obtained from this study were as follows: 1. The final weight of fattened bulls were 303.4, 361.2, 398.5, 422.3 and 456.0㎏ by the different levels of concentrates as 0, 0.5, 1.0, 1.5 and 2.0% of body weight, respectively. The finished body weights were significantly different from the different level of concentrates (P$lt;0.01). 2. The amount of DCP required for 1㎏ of body gain were 0.94, 0.73, 0.80, 0.87 and 0.85㎏ with the concentrates levels of 0, 0.5, 1.0, 1.5 and 2.0%, respectively. The amount of TDN required for 1㎏ of body gain were 12.40, 7.15, 7.23, 8.27 and 7.20㎏, respectively, in order of concentrates levels to be allowed. There was a tendency that feeds efficiency was the highest at the 0.5% of concentrates level among the different levels of concentrates to be fed. 3. The chilled carcass percentages were 52.4, 54.7, 57.1, 59.2 and 60.2% respectively with the levels of concentrates to be fed as 0, 0.5 10, 1 1.5 and 2.0% on live weights. The chilled carcass percentages were increased by the high levels of concentrates to be allowed.
박광진,김정현,배중면,Park, Kwang-Jin,Kim, Jung-Hyun,Bae, Joong-Myeon 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.4
The decrease of polarization resistance in cathode is the key point for operating at intermediate temperature SOFC (solid oxide fuel cell). In this study, the influence of Co substitution in B-site at complex perovskite on the electronic conductivity of PSCM ($Pr_{0.3}Sr_{0.7}Co_xMn_{(1-x)}$) was investigated. The PSCM series exhibits excellent MIEC (mixed ionic electronic conductor) properties. The ASR (area specific resistance) of PSCM3773 was $0.174{\Omega}{\cdot}cm^2\;at\;700^{\circ}C$. The activation energy of PSCM3773 was also lower than other compositions of PSCM. The TEC(thermal expansion coefficient) was decreased by addition of Mn. The ASR values were increased gradually during the thermal cycling test of PSCM37773 due to the delamination between electrolyte and cathode materials. The delamination was caused by the difference of TEC.
중·저온형 고체 산화물 연료전지의 공기극으로 사용되는 PSCF3737 물질의 특성에 관한 연구
박광진(Park, Kwang-Jin),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Pr_{0.3}Sr_{0.7}Co_{0.3}Fe_{0.7}O_{3-delta} (PSCF3737) was prepared and characterized as a cathode material for intermediate temperature-operating solid oxide fuel cell (IT-SOFC). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and electrical property measurement were carried out to study cathode performance of the material. XPS and EXAFS results proved that oxygen vacancy concentration was decreased and lattice constants of the perovskite structure material were increased by doping Fe up to 70 mol% at B-site of the crystal structure, which also extended the distance between oxygen and neighbor atoms. Thermal expansion coefficient (TEC) of PSCF3737 is smaller than that of Pr_{0.3}Sr_{0.7}CoO_{3-delta}(PSC37) due to lower oxygen vacancy concentration. PSCF3737 showed better cathode performance than PSC37. It might be due good adhesion by a smaller difference of TEC between Gd_{0.1}Ce_{0.9}O₂ (CGO91) and electrode. Composite material PSCF3737-CGO91 showed better compatibility of TEC than PSCF3737. However, PSCF3737-CGO91 did not represent higher electrochemical property than PSCF3737 due to decreased reaction sites by CGO91.
승용차 내장용 에어 밴트 부품 사출 금형 개발에 관한 연구
박광진(Park, Kwang-Jin),임태양(Lim, Tae-Yang),박태현(Park, Tae-Hyun),김기선(Kim, Key-Sun),김송화(Kim, Song-Hwa) 한국산학기술학회 2010 한국산학기술학회 학술대회 Vol.- No.-
본 논문은 자동차의 부품 중 에어 밴트를 효율적으로 개발하기 위하여 제품의 형상, 사출 해석, 변형과 그 제품이 완성차에 설치 시 열유동에 관한 해석 및 개발에 관한 논문이다. 이를 위하여 3차원 설계를 한 후, 사출성형 공정에 대한 충전시간, 웰드 라인, 에어트랩 등 사출 성형 공정에 대한 분석 하였다. 다음으로 완성차에 조립된 상태에서 열유동 해석을 통하여 제품 윤곽선의 적합성을 확립하였으며 이를 바탕으로 하여 금형을 제작할 수 있는 설계조건을 확립 하였다.
폐경 전 중년 여성의 대사증후군 위험도에 따른 신체구성, 건강관련체력 및 신체활동량의 비교
박광진(Park, Kwang-Jin),성순창(Sung, Soon-Chang),이만균(Lee, Man-Gyoon) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3
The purposes of this study was to compare body composition, health-related physical fitness, and physical activity level by degree of metabolic syndrome risk. Subjects of the study were thirty-seven middle-aged premenopausal women in three groups, i.e., normal group (n=12), risk group (n=15), and syndrome group (n=10). Body composition, health-related physical fitness, and physical activity level were compared among three groups. Main results were as follows: 1) There was significant difference in percent body fat among three groups, with the highest in syndrome group and the lowest in normal group. 2) Sit-up, sit-and-reach, and PEI by Harvard step test were significantly lower in syndrome group than in normal group. 3) There was significant difference in physical activity level obtained by the questionnaire among three groups, with the lowest in syndrome group and the highest in normal group. 4) There was significant positive correlation between the number of risk factor for metabolic syndrome and percent body fat. 5) There was significant negative correlation between the number of risk factor and sit-up, sit-and-reach, and PEI by Harvard step test. 6) There was significant negative correlation between the number of risk factor and physical activity level obtained by a questionnaire. It was concluded that as higher the degree of metabolic syndrome risk, as higher percent body fat as well as lower health-related physical fitness and physical activity level in middle-aged premenopausal women.