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In the era of the Fourth Industrial Revolution, efforts are being made throughout society to achieve innovation by utilizing artificial intelligence (AI). Developed countries are trying to maximize their combat capabilities using AI in defense areas. AI research on the defense of the Republic of Korea is focused on field-related applications, such as drones and robots; however, the research on the application of AI to training fields is relatively insufficient. In this paper, this study briefly summarizes the concept of AI and examines the use of AI in modeling and simulation (M&S) training, one of the defense M&S fields. Furthermore, the present study evaluates the areas where development is possible using current technology: decision support systems, intelligent tutoring systems, and automatic simulation of virtual entities. 4차 산업혁명 시대를 맞이하여 인공지능을 활용하여 혁신을 이루고자 하는 노력이 사회 전반에 걸쳐 이루어지고 있다. 국방분야에서도 이런 인공지능 기법을 이용하여 전투력 발휘를 극대화하기 위한 노력을 선진국을 중심으로 실시하고 있다. 우리군에서 인공지능 관련 연구는 드론, 로봇 등 전장 관련된 부분에 집중되어 있으며, 상대적으로 훈련 분야에 인공지능 기법 적용 연구는 부족한 실정이다. 이런 의미에서 본 연구는 인공지능의 개념에 대해 살펴보고, 국방 M&S 분야 중 하나인 훈련 M&S 분야의 인공지능 기법을 활용하고 있는 사례를 분석하였다. 또한, 현재의 기술력을 이용하여 의사결정 지원체계, 지능형 교관, 가상개체 자동 모의에 대한 발전 방안을 제시하였다.
Many natural slope failure in Korea occur every rainy season and the rainy season is concentrated from July to August. The natural slopes are infinite slopes that contain some finite soil depth and dry condition or partly saturated condition. The soil is wetted when rainfall infiltrates into unsaturated ground, generally. This paper aims at the development of tips whitch can measure negative pore water pressure easy and economically, and evaluation of possibility of pratical use. For this purpose an experment study is carried out what is called column test using the tips. From this study the tips of negative pore water pressure measured easy and accuracy is creditable.
In order to assess the behavior characteristics and stability of the ribbed steel strip reinforced soil retaining wall using the granite soil included crushed stone as backfill material, a series of the field test construction and monitoring were conducted. Displacement gauges were installed on two site of the reinforced earth wall of the 7.5m height, to obtain displacements of the wall facing during and after construction. For the reinforced earth wall of the 15m height strain gauges were installed in 7 steps to measure displacement of the wall. A step of the reinforcements and the displacement of the reinforce earth body. In the results of monitoring, face horizontal displacements were measured by very small, and its measures were presented to satisfy the allowable criterion for that. From the results of this study, the increment of face displacement and reinforcements strain was measured very little after construction, and it was found that the most of deformations of wall and reinforcements were occurred during construction due to compaction work for backfills. The reason of the satisfied strain behavior in this test site is thought due to the good compaction control for the granite soil with crushed stone that has good friction property.
The effects of road pavement influence on stability of road landfill by rainfall infiltration were analyzed in this study. A typical landfill model were selected and seepage behaviour was analyzed by finite element method. According to application availability of road pavement, the model were divided by nothing pavement, whole pavement, and portion pavement. And landfill height, rainfall condition, slip surface depth, and change of pore water pressure were analyzed. The research result was as followed. When landfill height was 5m and nothing pavement, increase of pore water pressure was showed remarkedly after rainfall end, but in case of the whole pavement and portion pavement was decreased. In case of the landfill height was 10m, 15m, the pore water pressure change by pavement availability was displayed resemblant change nearly. During rainy season, the stability of landfill was received an influence that landfill height 5m was below according to pavement condition, but in the case was more than 10m, the efect was slight. The depth of sliding from slope surface was showed form that increase according to landfillb height, but the relation of pavement condition about sliding depth could not be divided hardly.
A method of ground improvement was carried out in the municipal waste landfill. The effectiveness of improvement was mesured by a method which is called dynamic cone penetration test(DCPT) in the field. The landfill was composed of the municipal wastes dumped, demolished building debris, coal ash and industrial waste made between 1983 and 1989. From the results of mesurement by DCPT it was found that the DCPT is a sucessful method for mesurement of effectiveness of improvement in the waste landfill. But the use of DCPT is limited in the landfill because existence of solidity such as demolished building debris, gravel and wood.
Cognitive Radio(CR) is the technology that allocates the frequency by using dynamic spectrum access. We proposed a model to calculate the optimal level of the cognitive radiotelegraph, where secondary users opportunistically share the spectrum with primary users through the spectrum sensing. When secondary user with cognitive radio detects the arrival of a primary user in its current channel, the secondary user moves to the idle channel or be placed in the virtual queue. We assume that the primary users have finite buffers and the population of secondary users is finite. Using a two-dimensional Makov model with preemptive priority queueing, we could derive the blocking and waiting probability as well as the optimal level of cognitive radiotelegraph under a various range of parameter circumstances.