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Experience learning is one of the important history teaching processes in the elementary school education in which concrete manipulation is of significance. Students come to experience by inference through experience learning and understand history as the present which is continued even now rather than facts of the past. However, the current experience learning is just led by teachers or parents and students rarely leave for experience learning voluntarily with interest and from this problem started the present study. This study aimed to examine how the new experience learning model affect elementary school students` attitude towards history and recognition developing the experience learning model in which students participate themselves with interest by making the results through UCC and posting it on a web site for sharing information after students organized on a small scale conducted experience learning voluntarily. For this, first of all we analyzed the 2007 revised elementary school 5th year social studies curriculum and selected experience learning environ-ments which are the most appropriate for learning aims and contents under the curriculum among experience learning spaces scattered in downtown Seoul. The current study chose 5 places whose division of history into periods is clear and applied the new experience learning model to them, and used learning materials produced by teachers in person by each experience learning environment. The experience learning model developed in the current study is charac-teristic of results of experience learning made through UCC, the experience learning group composed of the small scale and the first and the second experience learning. The experience learning group composed on 6~8 students and a teacher carry out the first round experience learning altogether. The first experience learning is mainly led by the teacher in order to realize the experience learning connected with the curriculum. 2 out of students who came back after finishing the first experience learning organize the second experience learning gathering 4~6 students who have not joined the first experience learning. The second experience learning is carried out only by students and the students who participated in the first experience learning play the teacher`s role. Mutual evaluation and supplementation are made by sharing it by many students after making the second experience learning process through UCC and posting it on a web site. The reason why UCC is made is in order to prevent the subject class hours from being intruded by removing time to make a presentation of the results of ex- perience learning as well as arousing students` interest. As a result of having applied the experience learning model developed in the current study, it was found that students` interest in history and their initiative increased compared to those who were taken the existing class and experience learning, and the students felt stronger the relation -ships between their lives and continuity of history and their pressure of history learning decreased. However, the present study is a test which was conducted with a small number of students and it`s impossible or hard to generalize its effects. In addition, I am very sorry that qualitative research has not been made. In the future the need that it is conducted with more students in more various regions to test its effects remains an issue.
Recently, DC distribution system has come into the spotlight as the number of digital loads and the use of renewable energy increases. However, there are still challenges for the commercialization of DC distribution system such as a consideration for the safety. Thus, researches on protective coordination and grounding system for the safety of human bodies and facilities in Low-Voltage DC (LVDC) distribution system should be preferentially conducted. In this paper, therefore, we analyze characteristics of faults in LVDC system accroding to type of grounding system based on IEC 60364. Finally, the simulations for fault characteristic in different grounding scheme are conducted using ElectroMagnetic Transient Program(EMTP) and the results of simulation are shown.
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베트남은 전 세계에서 두 번째로 큰 커피 제조업체이자 수출국으로 성장하고 있다. 그러나 커피 산업에서 물류의 비효율적인 프로세스에 대한 문제가 꾸준히 제기되고 있으며, 이는 커피산업의 지속 가능한 성장을 저해하는 원인이 되고 있다. 따라서 본 연구는 주요 의사결정자인공급자와 사용자를 대상으로 물류 서비스 품질에 영향을 미치는 요인에 대한 조사를 수행하고, 결과를 비교·분석하고자 한다. 이를 위해 요인분석, 신뢰도분석 및 선형회귀분석이 순차적으로 수행된다. 분석 결과, 정보 품질, 주문 절차, 적시성 및 주문 조건을 포함한 네 개 항목이 요인으로 정의되었으며, 공급자는 적시성이 고객 만족을 위한 가장 중요한 요소로, 사용자는 주문 절차를 가장 중요한 요소로 각각 선정하였다. 회귀모형을 통해 고객 만족도에 긍정적인 영향을 미치는 요인 간 관계를 입증하였다. 이 연구는 베트남 커피 산업에 종사하는 정부, 관련 기관 및 기업에게 물류 인프라 및 프로세스 개선을 위한 의사결정 가이드라인을 제공할 것으로 기대된다. Vietnam is ranked as the second largest coffee manufacturer and exporter all over the world. However, the inefficient performance of logistics in the coffee industry is an endemic problem and can be a great treat for sustainable growth in the near future. This study provides a set of factors affecting the logistics service quality for two major stakeholders, providers and users, and compares their different viewpoints. Factor analysis(FA), reliability test and linear regression analysis are sequentially conducted. As results, four main factors including information quality, ordering procedures, timeliness and order condition were defined. Providers believed timeliness is the most important factor for customer satisfaction, while users thought order condition has the greatest impact. Regression models demonstrated the factors affect customer satisfaction positively. This research provides government, relevant organizations and firms involved in the Vietnam coffee industry with decision making guidelines and references to improve logistics infrastructure and process.
자성유체 유체씰에 사용할 수 있는 마그네타이트를 공침법에 의하여 합성하였다. 마그네타이트의 평균입자크기는 동적광산란 측정장치(DLS)에 의해 약 10∼12 nm 로 측정되었다. XRD 측정결과, NH4OH 의 농도가 증가함에 따라 마그네타이트의 결정화도가 증가하였다. 수중 분산된 자성유체의 제타전위는 -49.3 mV 에서 -26.2 mV 까지 DLS에 의하여 측정되었다. 입자의 형상은 구형이었고, 수상과 유상 자성유체에서 스파이킹 효과를 확인하였다. Magnetite in the use of magnetic fluid seal was synthesized by coprecipitation method. Mean particle size of magnetite was measured about 12 nm by using dynamic light scattering(DLS). As a result of XRD test, along with the NH4OH concentration was increased, the crystallinity of magnetite was increased. The zeta potential of dispersed ferrofluid in water was measured in the range from -49.3 mV to -26.2 mV by DLS. The shape of magnetite particle was sphere form, and the spiking effect of aqueous and oily ferrofulid was confirmed.