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허성관(Huh Sung-Kwan),김경수(Kim Kyung-Soo),김성욱(Kim. Sung-Wook) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In automobile front glass, there can be the front and vapour caused by temperature difference between inside and outsisd of automobile. This paper can solve this problem as developing simple system and installing some devices. The mechanism of this system is as like follows;<br/> The sensors which can sense the temperature and humidity of inner glass and outer glass send the signals to the MYCOM. As the information from sensors, MYCOM order the heating system to heat the water. The heated water be sent to the space which is made between inner glass and outer glass through the connecting tube.<br/> As flowing the heated water in the space, this system can prevent the front glass from frost and vapour. Therefore, this development will help traffic saftv for the driver.<br/>
혼돈( Chaos ) 이론에 의한 우리 나라 주가수익률의 분석
허성관(Sung Kwan Huh),서용권(Yong Kweon Suh) 한국경영학회 2000 經營學硏究 Vol.29 No.3
This paper empirically examines chaotic properties in the Korean stock returns. Prior studies analyzed the returns of value-weighted composite stock price index contained in the KIS-SMAT Data, and showed inconsistent results. In order to provide an additional evidence, this study analyzes daily returns of both value-weighted and equal-weighted composite stock price index of KSRI-Data. Six different industry stock returns are also analyzed. The time period of this study covers sixteen years starting from the beginning of 1980. The techniques undertaken to examine chaotic properties are the Hurst exponent, embedding of pseudo-phase-space, fractal dimension, and the Lyapunov exponent. Our results show that chaotic properties are not observed except the banking industry. This implies that the Korean stock returns are random and do not belong to a deterministic system. However, further studies are required to provide a solid evidence.