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권순주,민영봉,최진식,윤용철 경상대학교 농업생명과학연구원 2012 농업생명과학연구 Vol.46 No.5
This study was performed to reduce the operating cost of a greenhouse by securing electric energy required for greenhouse operation. Therefore, it experimentally reviewed the performance analysis of photovoltaic system in terms of maximum amount of generated electric power based on the amount of horizontal solar radiation during daytime. That is to say, the maximum solar radiation at 300, 400, 500, 600, 700, 800 and 900 W. m-2, respectively. The amount of momentary electric power of the photovoltaic system at any was about 970 W and we found that the momentary efficiency of the photovoltaic system that was used for this experiment was 97%. In the case of this system, we found that electric power will be generated when amount of horizontal solar radiation is more than 200 W. m-2, at minimum. If the amount of horizontal solar radiation is increased, the maximum power generation is also increased. At that time, the maximum efficiencies were 30, 78, 86 and 90%, respectively. However, when the amount of insolation was about 800 W. m-2, the maximum power generation tended to be lower than 700 W. m-2. The efficiency which caused the maximum electric power was decreased to less than 97% of the momentary generated electric power. When the total amounts of horizontal solar radiation per day were 3.24, 8.10, 10, 90, 12.70, 14.33, 19.53 and 21.48 MJ․m-2 respectively, the total amounts of power energy were 0.03, 0.40, 3.60, 4.37, 4.71, 4.70 and 4.91 kWh. And it represented that the total amounts of power energy were either decreased or increased a bit on the border between some solar radiations. The temperature at the back of the array tended to be higher than the temperature at the front but it demonstrated an increased when the amount of solar radiation increased. In the case of this system, the performance of the module in terms of degradation has not been shown yet. 본 연구에서는 온실 운영에 필요한 전력량을 확보함으로서 온실경영비 절감을 목적으로 수평면 일사량, 즉 최대 일사량이 각각 300, 400, 500, 600, 700, 800 및 900 W․m-2 정도인 날을 기준으로 최대 발전량과 시간의 경과에 따른 태양광발전시스템의 성능을 시험적으로 검토하였다. 태양광발전시스템의 순간 발생전력은 약 970 W정도로서 본 시험에 이용한 태양광발전시스템의 순간 효율은 97% 정도인 것을 알 수 있었다. 본 시스템의 경우, 수평면 일사량이 최소한 200 W․m-2 이상이 되어야 전력이 발생되는 것을 알 수 있었다. 수평면 일사량이 증가하면 최대 발생전력도 증가하였고, 이 때 최대효율은 각각 약 30, 78, 86 및 90% 정도였다. 그러나 일사량이 약 800 W․m-2정도가 되면 최대 발생전력은 오히려 700 W․m-2 보다 감소하는 경향이 있었다. 최대전력이 발생되는 효율도 순간 발생전력 97%정도보다 감소하였다. 그리고 일별 수평면 총일사량이 각각 3.24, 8.10, 10.90, 12.70, 14.33, 19.53 및 21.48 MJ․m-2정도 일 때, 총 발생전력량은 각각 0.03, 0.40, 3.60, 4.37, 4.71, 4.70 및 4.91 kWh정도로서 어느 일사량을 경계로 총 발생전력량은 조금 감소하거나 증가하였다. 어레이 배면온도가 전면온도보다 높게 나타나는 경향이 있지만, 일사량이 증가하면 어레이 배면온도도 증가하는 것으로 나타났다. 본 시스템의 경우, 아직까지 모듈의 성능저하는 없는 것으로 나타났다.
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少陰人 蘇合香元이 Stress 생쥐의 腦 Serotonin 含量에 미치는 影響
권순주,정대규,김연섭 대한한방신경정신과학회 1998 동의신경정신과학회지 Vol.9 No.2
This study was aimed to evaluate the anti-stress effect of Soeuminsohabhyangwon on the mice in Cold and Swimming stress. In order to investigate the anti-stress effect of Soeuminsohabhyangwon in Cold and Swimming stressed mice, the serotonin contents were measured by HPLC method in various part of mouse brain The following results were observed. 1. In Cerebral Cortex of Frontal Lobe, the serotonin content was decreased in the Control group as compared with Normal group and the serotonin content was increased in the SHW group as compared with Control group. 2. In hypothalamus, the serotonin content was decreased in the Control group as compared with Normal group and the serotonin content was increased with statistical significance in the SHW group as compared with Control group. 3. In corpus striatum, the serotonin content was decreased in the Control group as compared with Normal group and the serotonin content was increased with statistical significance in the SHW group as compared with Control group. 4. In hippocampus, the serotonin content was decreased in the Control group as compared with Normal group and the serotonin content was increased with statistical significance in the SHW group as compared with control group. Base on the above results, it may be concluded that Soeuminsohabhyangwon are effective to reduce stress.
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가속전자빔투사에 의한 TiC 강화 철계 표면복합층의 제조 연구
권순주,이성학,추성훈 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7
Surface composite layers reinforced with TiC particles were fabricated by high-energy accelerated electron beam. TiC powders were mixed with MgO/CaO flux powders with varying the flux mixing ratios of 5, 10, 20, and 40 wt.% to process four kinds of TiC/flux mixtures. The TiC/flux mixtures were deposited evenly on a plain carbon steel substrate, on which electron beam was irradiated to fabricate TiC reinforced surface composite layers. The microstructural analysis was conducted using X-ray diffraction and Mo¨ssbauer spectroscopy as well as optical and scanning electron microscopy. The microstructure of the surface composites was composed of surface composite layer, interfacial region, coarse-grained heat affected zone (HAZ), and finegrained HAZ. A few TiC agglomerates and residual micropores were found in the composite layer of the specimen processed without flux because of density difference, but their number was significantly decreased in the specimens processed with a considerable amount of flux. As a result of irradiation, TiC particles were homogeneously dispersed throughout the composite layer of 2.5 ㎜ in thickness, whose hardness was greatly improved. The proper flux mixing ratio was 10˚-20% to obtain excellent surface composite layers containing homogeneously dispersed TiC particles.
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고에너지 전자빔이 투사된 철강재료 표면층의 뫼스바우어 분석
권순주,이성학,추성훈,최상준 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.2
The phases in the surface layer irradiated by high-energy electron beam were quantitatively analyzed by M ssbauer spectroscopy. A plain carbon steel, a gray cast iron, and a TiB₂/steel surface-alloyed material were irradiated by using an electron accelerator (1.4 MeV), and then their microstructures were examined by using m ssbauer spectroscopy as well as optical microscopy. Upon irradiation, the unirradiated microstructures containing ferrite-pearlite, flake graphites and the pearlite matrix, or TiB₂ powders on the steel surface were changed to martensite-bainite, martensite-ledeburite-austenite, or ferrite-bainite-pearlite, respectively, depending on the material composition and the irradiation condition. These M ssbauer analysis data matched well with the microstructures of the irradiated surface layer. Thus the M ssbauer ,spectroscopy in conjunction with microstructural observations was very useful in quantifying the phases in the complex microstructure formed by electron beam irradiation.
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