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This study was performed to summarize briefly the current understanding of dust explosion and suggest a protection method for dust explosion in industrial process. The information of the minimum explosible dust flames, characteristics of dust explosion, explosion parameters, explosion hazards of dusts are summarized. The preventive means can be split in the two categories prevention of ignition sources and prevention of explosive/combustible cloud. The majority of the data on the explosion properties of dust are collected from previous studies.
This study focuses on the effect of key monetary policy variables and mortgage credit policy indicator, liquidity-related variables on the real estate price volatility dynamics in korea. For this purpose, the independent variables and the dependent variables were converted to a volatility–related variables. Based on monthly data from January 1998 to August 2013, it demonstrates underlying relation between the real estate market and monetary policy. Empirical result shows that both expansionary monetary policy (declining interest rates, faster money supply growth) and non-mortgage credit policy tends to accelerate the subsequent home price growth rate. however, restrictive monetary policy (rising interest rates, slower money supply growth) and the introduction of mortgage credit policy tends to decelerate the subsequent home price growth rate. Through the results, This study finds that monetary policy factors are the important driving forces behind the change of real estate price growth rate. Furthermore, a bullish stock market related to accelerate subsequent home price growth rate. Finally, hot money flow not have statistically significant effects on the home price growth rate. 본 연구는 핵심적인 통화정책 관련 변수들과 모기지 규제 정책, 유동성 관련 변수들이 한국의 부동산 가격 변동성 동학에 미치는 영향에 대해 분석하였다. 이를 위해, 독립변수와 종속변수를 동학적 해석이 가능하도록 변동성 관련변수로 변환하였다. 1998년 1월부터 2013년 8월까지의 한국은행 및 기타 자료에 기초한 본 연구는 부동산 시장과 통화정책간의 잠재적인 관계를 설명해준다. 실증분석 결과 팽창적 통화정책(기준금리 하락 및 통화량 공급 가속)과 모기지 규제정책의 부재는 차기의 주택가격변동률을 추가적으로 가속시키는 경향이 있는 것으로 나타났다. 그러나 긴축적 통화정책(기준금리 상승, 통화량 공급 감속)과 모기지 규제정책의 도입은 주택가격변동률을 추가적으로 감속시키는 경향이 있는 것으로 나타났다. 이를 통해, 본 연구는 통화정책의 주요요소들이 부동산 가격 변동률 변화의 중요한 원동력임을 밝혔다. 또한, 상승주식시장은 차기의 주택가격변동률 가속과 관련이 있는 것을 확인하였다. 마지막으로 외부 단기성투기자금 유입은 주택가격변동률과는 통계적으로 중요한 영향은 없는 것을 확인하였다.
Single ascospores was isolated in Yesan-gun, Chungnam in 2006 with Cordyceps militaris. This study was carried out to select the superior isolates which produce more fruiting body and contain more cordycepin contents. Five single ascospore isolates were cultured on brown rice pupae medium and they formed fruiting bodies. To select better isolates, each isolates was hybridized and then the characteristics and cordycepin contents were investigated. After biological efficiency and codycepin contents were examined, finally C0601S05 was selected. Top-cross test of isolate C0601S05 was carried with 29 single ascospores. From this test, isolate C0601S05×C0601S33 and isolate C0601S05×C0601S43 containing highest cordycepin contents were selected. Codycepin contents of C0601S05 was 246mg% and those of C0601S05×C0601S33 and C0601S05×C0601S43 were 325mg% and 280mg%, respectively. C0601S05×C0601S33 was registered as Yedang 3 at the Korea seed & variety service.
This study was performed to analysis the effects of sprinkler in apartment fire. The analysis was conducted by fire simulation program(CFAST V6.0, NIST). The operating time of the hear detecter and the effects of sprinkler with RTI 200 and RTI 40 were analyzed by CFAST. There were no difference of smoke layer hight, but much effects of smoke layer temperature and toxic gases concentrations between RTI 200 and RTI 40 sprinkler activation. The heat detecter of the fire room was activated 152 second after fire. The RTI 200 sprinkler was activated 198 second and RTI 40 sprinkle was activated 156 second after fire. When RTI 40 sprinkler is activated CO and CO₂ concentrations are increased and O₂ decreased more slowly than RTI 200 sprinkler is activated. From this study, RTI 40 sprinkler is more useful to extinguish fire and to evacuate the residence safe from the apartment fire.
A passive control for reducing the strength of shock wave was conducted experimentally in a 2.5×8㎠ supersonic wind tunnel. Tests are performed on roof mounted half circular arc to evaluate the effects of porosity, length and depth of cavity in passive control of shock wave on the attenuation of shock strength by reviewing the measured static pressures at the porous wall. Also the flow field was visualized by a Schlieren system. It was founded that in the present study the porosity of 8% produced the largest reduction of pressure rise across the shock wave and that for the same porosity, the strength of shock wave decreases with the increasings of the depth and length of cavity.
Every year there have been many cases large scale fire accidents at Korean traditional markets (JaeRaeShiJang) with significant life and property loss. Korean traditional markets are vulnerable to fire because of their outdated structure with weak fire protection system. This investigation was performed to improve the current fire protection system of the traditional markets, thousands of which still exist nation-widely providing with the basis of important economic activity of significant number of people. This research was based on the safety survey for all types of markets including department stores in Korea by NEMA(National Emergency Management Agency society) together with the case study of the fire at Seomoon Market on 29th Dec. in 2005 in Daegu City. To minimize the loss and damage of fire effectively, this study approached to both hardware and software of the protection system considering various aspects of fire accidents. We suggest to develop a new education program for the people working at the markets for their self-participation in the safety management. The replacement and reinforcement of safety facilities and equipments in and around markets is urgently needed such as Fire hydrant, Detection, Sprinkler and Smoke control system. The closer and systemic co-operation of the relevant governmental agencies is a very important factor. We suggest an ear1y application of PBD(Performance Based Design) method on the high risk level buildings. To implement the suggested new fire protection system, the revision of the relevant laws and regulations for fire safety is a prerequisite.
신형안전로 개발의 필요성을 설비개발이라는 관점에서 우리가 해결해야 할 과제로 요약하면 첫 째는 설계개념이다. 즉 어떠한 설계개념을 채택하여야만 설비의 단순화가 가능하며 중소형이 면서도 경제성 확보가 가능할 것인가 하는 점이며, 둘째는 이러한 새로운 개념은 과연 원전의 안전성이 혁신적으로 개선된 것이며, 어디에나 용이하게 건설이 가능토록 부지요건이 완화된 것이며, 전문가가 아닌 사람도 용이하게 운전가능토록 준 무인운전 수준의 편의성 확보가 가능 한가 하는 점이다. 셋째는 극히 소용량인 지역난방 원자로에서부터 대용량 발전 설비에 이르 기까지의 연계 개발 계획으로서 수요처별 수요 적응 특성 반영과 Modular Type 또는 기타의 방법으로 용이하게 용량을 확장할 수 있는 방법을 강구하는 문제이다.