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해저케이블 비용 모델을 이용한 HVAC 해상변전소 적정 위치 선정에 관한 연구
원종남(Jong-Nam Won),문원식(Won-Sik Moon),허재선(Jae-Sun Huh),김재철(Jae-Chul Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
Development of the technologies for offshore wind power is proceeding actively and the installation capacity is continuously increasing because of its many advantages in comparison with the land wind power. Accordingly, project for Southwestern 2.5GW offshore wind power plant is in progress in Korea. Design of electric power systems for offshore wind power plant is very important due to its high investment and operational costs. Hence, it needs to be designed in order to minimize costs. This way can be employed in determining the installation location of offshore substation for HVAC wind power plant. According to the offshore substation site, MV inter-array cable and HV export cable lengths vary and they change a total cost regarding submarine cable. This paper represents cost models with variables which are MV inter-array cable and HV export cable lengths to locate the offshore substation for HVAC wind power plant. It is classified into submarine cable installation cost, reactive power compensator installation cost, ohmic losses, and unsupplied energy cost. By minimizing a total cost, an appropriate installation site of the offshore substation is determined.
Si-Cr 스프링 강에서의 Mo 및 W 첨가가 미세조직 및 기계적 성질에 미치는 영향
남원종,이상래,반덕영 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.2
Effects of the Mo and W additions to Si-Cr spring steels on the microstructural evolution and mechanical properties in spring steels were investigated. It was found that the Mo and/or W addition does not change the behavior of tempered carbide at low temperatures, such as the precipitation of ε-carbide and the conversion of ε-carbide to cementite, via dilatometry tests and the observation of microstructure using TEM. However, it would reduce the coarsening rate of cementite at high temperatures above 450℃, resulting in the smaller size of cementite particles due to the lower diffusion rate. Since the sag resistance depends on the distribution and the size of precipitates, steel C(0.2% W) showed the strongest sag resistance whereas steel A showed the weakest sag resistance, when tempered at 450℃. Also, an abundance of precipitates at 350℃ tempering exhibits the maximum loop area, i.e., the sag resistance for all the tested steels. The Mo and W additions to Si-Cr spring steels raised the ratio of loop area/tensile strength. Therefore, the Mo and W additions would be effective method to increase the sag resistance as well as strength in Si-Cr spring steels.
이광원,고영길,원종남 亞洲大學校 1985 論文集 Vol.8 No.-
For the process with dead time, a low-order discrete-time modeling method is suggested and a digital predictor-controller has been developed. It is easy to adjust the model parameters under a different sampling rate and controller tuning is possible on the spot. A simple predictor is presented, which removes the dominant pole of the process.