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이 논문은 M 방송국이 요청한 100m ~ 500m의 이격거리를 유지하기 위하여 실습선 “한바다”호와 행사지원 선박과의 최소 안전이격 거리에 대하여 다룬 것이다. 이 최소안전 이격거리는 조종곤란도를 정량적으로 평가하는 ES Model과 해상교통류 시뮬레이션을 이용하여 평가하였는데 그 결과는 2노트로 항진하는 실습선 “한바다”호의 경우 약 260m이고 이 값을 실제의 값과 비교하였다. This paper is to investigate the minimum safe distance between T/S Hanbada and a group of vessels participating in the event hosted by M broadcasting station who asked T/S Hanbada to keep a distance from 100m ~ 500m. The minimum safe distance was assessed by using ES Model which evaluates quantitatively the difficulty of shiphandling, and the simulation of marine traffic flow. As a result the minimum safe distance of T/S Hanbada moving at a speed of 2 knots turns out about 260m and is compared with the actual value.
Described in this paper is the software to design of a railway interlocking table, which describes the functional specifications of an interlocking device. Interlocking tables has been designed mainly based on personal expertise among signal engineers. However, this expertise needs to be analyzed with technical uniformity and integrated in an organized system. The proposed software is amount to the signal engineer's expertise, yet a generalization of interlocking reasoning. The algorithm is based on the train route setting principle, and is applicable in solving practical problems by computers. The software was evaluated through man-made and machine-made interlocking tables are compared. The evaluation results proves the software to be effective for computer control of the signaling system as interlocking system with a much improved safety.
In Korea, foot-and-mouth disease has not been reported for several decades, but it began to develop again in 2000. For 2010~2011, when the worst occurred, 3.5 million animals were disposed of resulting in a loss of 2.8 trillion won. In order to prevent the harmful effects of foot-and-mouth disease, vaccination and housing management are being implemented. Despite these measures, foot-and-mouth disease is infected with air through the respiratory tract and accompanies fever after latency. Therefore, it is recognized that measuring and managing the body temperature of livestock at the early stage is the first step of managing this disease. In this paper, we propose a temperature monitoring system that can measure the body temperature by incorporating temperature sensor mounted in ear-tag of cattle and collect body temperature data of each individual cattle through BLE into the control server. The proposed body temperature monitoring system has various advantages such as easy installation without the help of livestock specialists and not damaging the organs of the livestock. So, it is possible to manage the abnormal symptom of cattle in real time and it is believed that the proposed monitoring system will revolutionize the prevention of foot-and-mouth disease.
Recently developed TSC beam is composite structure. Stud bolts were used as shear connectors at the composite beam to resist the horizontal shear forces occurred between concrete slab and U type steel beam. In this study, interface delamination test was conducted to know relationship between bond strength which is affected by crack of concrete and flexural strength of TSC composite beam. Form oil and sand were used for four specimens to generate interface and compared with two standard specimens.
현재 고속도로 상의 노후 교량에 대하여는 재하시험을 통하여 정량적인 내하력 평가를 수행하고, 만족스러운 수준의 내하력이 확보되지 않은 경우에는 보수, 보강 또는 교체를 수행한다. 그러나 교통량이 많은 고속도로상의 교량에 대해서는 재하시험이 매우 어렵고, 센서 케이블 작업으로 인하여 작업성이 떨어지는 경우가 많다. 본 연구에서는 이러한 문제점들을 개선하기 위하여 상시교통하중에 의한 교량 내하력 평가 시스템에 대한 연구를 수행하였다. 내하력 평가 대상 교량에 대하여 상시진동계측을 수행하였으며, 계측된 데이터를 통하여 교량의 동특성을 추정하였다. 추정된 동특성을 바탕으로 초기 해석 모델을 Downhill Simplex 방법을 이용하여 개선하였으며, 개선된 교량 모델을 이용하여 재하시험을 시뮬레이션 함으로써, 처짐 보정 계수를 구하였다.
This paper addresses a particle swarm optimization-based approach for solving a generating unit maintenance scheduling problem(GMS) with some constraints. We focus on the power system reliability such as reserve ratio better than cost function as the objective function of GMS problem. It is shown that particle swarm optimization-based method is effective in obtaining feasible schedules such as GMS problem related to power system planning and operation. In this paper, we find the optimal solution of the GMS problem within a specific time horizon using particle swarm optimization algorithm. Simple case study with 16-generators system is applicable to the GMS problem. From the result, we can conclude that PSO is enough to look for the optimal solution properly in the generating unit maintenance scheduling problem.
In this paper, we surveyed researches on the generation maintenance scheduling in competitive electricity markets. Maintenance scheduling can be one of the strategies submitted by market participants in electricity market. Many researches on the maintenance scheduling were preceded with or without transmission system. They have their own specific algorithm for ISO to operate, and control the maintenance schedules. This paper is focused on the survey on the generator and transmission system maintenance scheduling in competitive electricity markets.
This paper is focused on the survey on the power system modeling using a clustering algorithm. In electricity markets, clustering method is a efficient tool to model the power system. It can be seen that electricity markets can also be classified into several groups which show similar patterns and that the fundamental characteristics of power systems can be widely applicable to other technical problems in power system such as generation scheduling, power flow analysis, short-term load forecasting, and so on. There are several researches on the power system modeling using a clustering algorithm. We specially surveyed their own clustering methods to model the power system.
As an insurance industry is rapidly growing into a developed country`s level due to an advancement of industry in Korea, the insurance crime continues to increase. Accordingly, there are the studies relating to the insurance prime in progress, but most of studies relating to the crime type and problems are focused on an exposure for preventing the insurance company`s business deterioration yet. There is no satisfactory study conducted for the purpose of reducing the crime effectively by preventing the insurance crime in advance through strengthening the government aspect`s institutional arrangement. Currently, Korea has the world`s seventh insurance scale. We need to review the progressive plan of the insurance-advanced country through legislating the strong form`s new regulation as the special law. The purpose of this study is to analyze what factors out of necessary factors for reduction of insurance crime are more important and should be first taken. A questionnaire survey was conducted for the insurance company`s special investigators and the insurance crime-exclusive policemen in order to search the priority of factors required for the reduction of insurance crimes and the insurance crime reduction measures through Analytic Hierarchy Process that can measure a quantitative or tangible criteria as ratio scale in such an empirical analysis. To achieve the above purpose, the alternative and criteria suitable for the study were established and the questionnaires were analyzed by using the AHP structure and the Excel 2007 program to evaluate the relative importance of each evaluation factor with the scale with 1∼9 and inverse number. Considering the police and insurance company`s AHP analysis results on the measures for reduction of insurance crime, it can be concluded that the legal and institutional arrangements such as the insurance crime reduction-related special law, information offering·sharing-relevant law, and an enactment of insurance fraud are the most important measures to reduce the insurance crime. Also, if the institutional arrangements such as the enactment of Special Criminal Act are completed to reduce the insurance crime, the crime will be easily prevented through arousing people`s attention on the insurance crime, and the insurance crimes will be eradicated by actual and constant investigation. In addition, through preventing the leakage of insurance money, multiple good policy-holders will be protected and the healthy insurance industry will be promoted. In conclusion, this study is intended to suggest the legislation of special law for prevention of insurance crime as the policy alternative among legal institutional arrangements by using the mutual comparison method through Analytic Hierarchy Process that presents the policy alternative to reduce the insurance crime, not the insurance criminal exposure-focused study.