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본 논문에서는 동파방지용으로 쓰이는 직렬형 열선과 자기온도제어기능이 있는 정 온전선의 원리 및 구조를 살펴보고 정상동작 실험과 단락실험을 통해 전류의 파형, 크 기 등의 전기적 특성 및 피복의 온도변화를 비교분석하였다. 직렬형 열선의 경우 단락 전류는 정상동작 상태의 전류보다 약 3배 높았지만 상승한 온도는 피복의 허용온도보 다 낮게 측정되었다. 정온전선의 단락전류는 82.5A로 측정되었으며 컨트롤러 PCB패턴 이 용단되면서 아크가 발생하는 화재요인이 도출되었다. 단락실험 결과 정온전선은 직 렬형 열선에 비해 화재위험성이 더 높음을 확인하였다. 그러나 열선을 감싸고 있는 피 복의 재질은 정온전선이 직렬형 열선에 비해 강도가 높아 피복 소손에 의한 단락 발생 위험이 낮음을 확인하였다.
Roller drafting is often accompanied by an irregularity in the linear density of slivers. In this research, the issue of sliver irregularity was investigated by simulating the dynamic behavior of slivers in the roller draft zone based on an improved mathematical model describing the movement of slivers with a staple-length distribution. The linear density and velocity of slivers in the draft zone were considered coupled variables. Simulations under certain constraints in the parameters, changing only the sliver viscosity, revealed that the sliver linear density can fluctuate during steady state (the socalled draft wave) in a certain range of sliver viscosity, and those fluctuations can be decomposed into several mode frequencies. However, the draft wave did not appear when slivers with low viscosity were used, suggesting that good open slivers composed of low surfacefriction staples can yield to a good drafted sliver without draft waves.
Frictional bundling of fibers is accompanied by twists that compel the bundle cohesion force to generate bundle strength. Twists generated by friction occur in two forms; one by fiber arrangement on the bundle layer and the other by torque due to the thickness distribution of the bundle on the friction surface. This study investigates the twists of a friction bundle that occur on the friction surface, and theoretical models of twists are applied to develop total twist and the twist characteristics by simulation. Results showed that the fiber arrangement twists are directionally opposite to the torque twists; fiber arrangement twists occur as S-twists and torque twists as Z-twists. In the steady state the bundle exiting the friction zone had S-twists finally and the twists per length was uniform along the bundle radius. The steady state twists of the bundle at the exit of the friction zone were determined by two model constants and a process variable. The two model constants were composed of model parameters such as slippage ratio, minimum thickness of the fleece for bundling, the density ratio of the bundle to the input fleece, and also of process variables such as friction ratio, the speed ratio of the fleece feeding to bundle takeup, and the thickness of the input fleece. The process variable acting directly on the bundle twist was the fleece feeding width. Thus, the twist angle of the bundle in the friction zone varied with the radial position inside the bundle. The twist angle was the lowest in the vicinity of the bundle axis. As the fiber layer approaches the bundle surface, the twist angle increases.
Real Estate market is very complicated and intrigued for its size and procedures. For an average people experience only a few times for their life times because of size of amount of the transactions. And for its rareness, mostly people does not familiar with its procedures and rules and regulations, which are rather complicated than average contract. Involuntarily loss and disadvantage are common for a average for their ignorance. Trust, clearness, and safety are key factors for real estate transactional market. Which is very important for national economy for its size and closeness of common people. The efficiency and effectiveness can be improved and achieved through trust, clearness, and safety. Korean real estate market is facing globalization and requiring enhancement of efficiency of its market domestically. Especially, due to the FTA (Free Trade Agreement) with US. The service market, including real estate transactional market, has to be open and compete with an international real estate agency corporation. The main purpose of this paper is to contribute and showing some guidelines for Korean real estate transactional market, which has to be adjusted and adopted with global standards which represent US. real estate transactional laws and rules and regulations, and customs.
The behavioral characteristics of sliver linear density under roller drafting operation were investigated in this study. A theoretical model describing the dynamic behavior of the staples flowing in a single direction was applied. While the model parameters remained constant, the process parameters including draw ratio and roller distance were varied. Simulations of the dynamic behavior of the drawn sliver linear density showed that it was dependent on the process conditions, and the effects varied depending on the staple length distribution. For uniform length staples, the linear density of the drawn sliver showed periodic changes at a steady state when the drawing roller distance was long. For the short drawing zone, the drawn sliver exhibited a constant steady state linear density. Increasing the draw ratio caused the linear density to change periodically which resulted in an increase in the CV% of the drawn sliver linear density. For length distributed staples, the linear density was sensitive to the draw ratio. At a low draw ratio, for example, DR=4, the drawing zone length did not affect the sliver linear density, and a constant linear density was observed. However, at high draw ratios, for example, DR=12, the drawing zone length affected the linear density behavior of the drawn sliver, showing periodic changes in the steady state. Thus, high draw ratios and long drawing zones caused a drastic increase in the CV% of the quasi-steady state linear density. In general, the two passes of sliver in a drawing operation with low draw ratio resulted in improved properties, that is, a more even linear density of the drawn sliver than that obtained using single drawing pass with a high level draw ratio, which drastically increased the linear density.