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RISS 인기검색어
- 검색키워드
- 저자 : 박광진(Park, Gwang-Jin) (검색결과 139 건)
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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.
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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.
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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.
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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 $700^{\circ}C$.
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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.
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COX 억제제에 의해 유도되는 구강편평세포암종 세포주의 성장 억제 효과
박광진,한세진,이재훈,Park, Gwang-Jin,Han, Se-Jin,Lee, Jae-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.4
The objectives of this study was to explore the growth pattern of the oral squamous cell carcinoma when overexpressed COX was inhibited, explore the pathway that COX inhibitors suppressed the proliferation of cancer cells, and then hereafter investigate the potential of COX as chemopreventive target for oral squamous cell carcinoma. For confirming the COX-dependent effect and mechanisms on growth of the oral cancer cells, we treated the nonselective NSAID, Mefenamic acid and COX-2 selective inhibitor, Celecoxib in HN4 cell line. And then the cell line was evaluated with MTT assay and growth curve, the production of PGE2, total RNA extraction and RT-PCR analysis, and TEM The results were obtained as follows: 1. After administration of medication, in the result of MTT assay, Celecoxib inoculated group inhibit the cell growth rather than Mefenamic acid inoculated group. 2. The growth curve of cell line showed as time passes by there was a dramatic cell growth in the control group, and gradual growth inhibition was found in medication inoculated group and, in Celecoxib inoculated group there was more inhibition of cell growth. 3. After the administration of medication, Celecoxib tend to inhibit the synthesis of PGE2 more than Mefenamic acid. Mefenamic acid inhibit the synthesis of PGE2 more as the concentration gets high, but Celecoxib inhibited the synthesis of PGE2 even in low concentration. 4. After the administration of medication, the revelation of COX mRNA in cell line, there was a 50% decrease in COX-1, 60% decrease in COX-2 as in $50{\mu}M$ Mefenamic acid, and in Celecoxib $50{\mu}M$ there was not much difference in COX-1 and 90% decrease in COX-2 was found. 5. HN4 cell line showed broken nucleus and tangled cytoskeleton bundles in cytoplasm which meant apoptotic features after the treatment of Celecoxib in TEM view. Depending on the above results, we estimate that the inhibition of the expression of COX-2 cause the growth suppression of the oral squamous cell carcinoma, and it get achieved through pathway of reduced PGE2 production and increased apoptosis. In addition to, because COX-2 selective inhibitor specifically act to COX-2, it is considered that COX-2 selective inhibitor has the adequate potential as chemopreventive agent for oral squamous cell carcinoma.
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