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It is important to measure and analyze offshore platform motion data for the safety of offshore platforms that are installed in an extreme environmental conditions. Especially, in the Gulf of Mexico, because of the hurricane and loop current that has been strengthened due to changes in the ocean environment, a monitoring system is necessary to measure the offshore platform motion data in real time, as well as simultaneously analyze it for safe operation and accident prevention. In order to develop such a monitoring system, it is extremely critical to obtain accurate data. However, since data measured in real time is not suitable for analysis due to quality problems, the data must be processed. The problem is that the processed data differs depending on the processing methods being employed, and results in entirely different analysis results. Incorrect results can mislead the current state of the offshore platform causing missed maintenance periods or, in the worst case, major accidents. Therefore, verifying both the adequacy of the methods used to process the data and the accuracy of the results is most vital. In this paper, improving reliability of the monitoring system that can measure offshore platform motion data and analyze data in real time, the validity of the method used in measurement data processing and the accuracy of the processed data were verified.
본 논문에서는 환형 영구자석을 이용한 스러스트 베어링의 최적설계에 대하여 기술하였다. 영구자석형 스러스트 베어링은 두 조의 환형 영구자석으로 이루어지며, 한 조의 영구자석이 다른 한 조의 영구자석 내부에 위치한다. 영구자석간의 축방향 변위 (엇갈림)에 의해 축방향 힘이 발생하고 이를 통해 스러스트 베어링 역할을 하게 된다. 최소한의 영구자석으로 베어링 부하용량을 만족하는 베어링 설계 파라미터를 구하기 위해 본 논문에서는 등가전류판 방법을 이용하여 해석적 설계식을 유도하고, 적절한 제한 조건을 설정하여 최적 설계를 수행하였다. 최적 설계 결과는 3 차원 유한요소해석을 통해 검증하였다. 본 논문에서 고려한 축방향 배열과 Halbach 배열의 스러스트 베어링 중 Halbach 배열이 축방향 배열에 비해 동일한 부피의 영구자석으로 더 큰 부하용량을 얻을 수 있음을 확인하였다. 등가전류판 방법의 유효성을 3 차원 유한요소해석을 통해 검증하였고, 축 방향 배열보다Halbach 배열이 등가전류판 방법의 가정에 좀 더 민감하게 영향을 받는 것을 알 수 있었다. In this paper, we describe a process for optimally designing a ring-type permanent magnet thrust bearing. The bearing consists of two sets of permanent magnet rings. One set is located inside the other set. An axial offset between the two sets creates axial force, which results in a thrust bearing function. In order to realize an optimal design of the bearing where the required load capacity of the bearing is achieved with the least magnet volume, we derived analytical design equations by adopting the equivalent current sheet (ECS) method. We considered the following two types of magnet arrays: axial arrays and Halbach arrays. These two types of arrays are optimized using the analytical design equations. The results of the optimization are verified using three dimensional (3D) finite element analyses (FEA). The results show that the Halbach array can achieve the required load capacity with less amount of permanent magnet than the axial array does. The efficacy of the ECS method is also verified by using 3D FEA. It is found that the accuracy of ECS method is more sensitive to the underlying assumptions for the Halbach array than for the axial array.
This study was carried out to investigate the flora of Kangwon National University of Chuncheon Campus from March, 2016 to October, 2016. The vascular plants were summarized as 447 taxa, including 101 families, 285 genera, 389 species, 4 subspecies, 36 varieties and 18 forms. Among the investigated 447 taxa, number of native plants and cultivated plants were 276 taxa (61.8%) and 171 taxa (38.3%), respectively. Among these, 7 endemic, 42 rare, 42 special plants by phytogeographical distribution were investigated. The naturalized plant were 49 taxa, and urbanization index and the percent of naturalized plant species was estimated 15.3 and 11.0%, respectively. The usefulness of the plants of the 447 taxa listed consists of 172 taxa (38.5%) of pasture plants, 171 taxa (38.3%) of edible plants, 153 taxa (34.2%) of medicinal plants, 129 taxa (28.9%) of ornamental plants.
Radiative heating is suitable for outdoor heating system in windy and cold seasons. Optimal design of the reflector is very important to maximize heat transfer to a specific target area in the open space. The geometrical optical theory can be applied to analyze efficiency of the reflector. Commercial ray tracing computer programs are available only for limited geometries of the reflector. Alternatively, it may be designed and analyzed through an approximated simple lens theory. Two types of reflectors are analyzed using either of these methods. The key issue in this paper is to propose a new illumination experimental method for determination of the radiative efficiency. Optical light source and illuminometer are employed. The calculated efficiency of the reflector is compared with experimental one for checking the reliability. The relative errors between the experimental and analytical results are less than 5%, which proves the validity of this method. Based on these methodologies, a practical reflector and heating lamp unit is developed.
남정환 ( Jung Hwan Nam ), 조인숙 ( In Sook Cho ), 김수정 ( Su Jeong Kim ), 남춘우 ( Chun Woo Nam ), 서종택 ( Jong Taek Seo ), 유동림 ( Dong Lim Yoo ), 김원배 ( Won Bae Kim ), 유승열 ( Seung Yeol Ryu ), 이응호 ( Eung Ho Lee ), 김민영 ( Min ) 한국응용생명화학회(구 한국농화학회) 2008 Applied Biological Chemistry (Appl Biol Chem) Vol.51 No.2