• Nuclear Engineering and Technology
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• 제53권9호
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• pp.2899-2908
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• 2021

The laser transport system of the high power laser facility is mainly composed of large-aperture laser transport mirrors (TMs). Obtaining the high-resolution online damage images during the operation, which is of great significance for operating safely of the mirrors and the facility. Based on wavefront coding, pan-tilt scanning and image stitching technologies, an online laser-damage images detection system is designed, and it can achieve high-precision detection of surface characteristics of large-aperture laser transport mirrors. The preliminary simulation proves that the system can solve the depth of field matching problem caused by pan-tilt tilt imaging and achieve higher resolution.

• Nuclear Engineering and Technology
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• 제53권12호
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• pp.3879-3891
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• 2021

A heat pipe residual heat removal system is proposed to be incorporated into the reactor driven subcritical (RDS) facility, which has been proposed by MIT Nuclear Reactor Laboratory for testing and demonstrating the Fluoride-salt-cooled High-temperature Reactor (FHR). It aims to reduce the risk of the system operation after the shutdown of the facility. One of the main components of the system is an air-cooled heat pipe heat exchanger. The alkali-metal high-temperature heat pipe was designed to meet the operation temperature and residual heat removal requirement of the facility. The heat pipe model developed in the previous work was adopted to simulate the designed heat pipe and assess the heat transport capability. 3D numerical simulation of the subcritical facility active zone was performed by the commercial CFD software STAR CCM + to investigate the operation characteristics of this proposed system. The thermal resistance network of the heat pipe was built and incorporated into the CFD model. The nominal condition, partial loss of air flow accident and partial heat pipe failure accident were simulated and analyzed. The results show that the residual heat removal system can provide sufficient cooling of the subcritical facility with a remarkable safety margin. The heat pipe can work under the recommended operation temperature range and the heat flux is below all thermal limits. The facility peak temperature is also lower than the safety limits.

• 한국재난정보학회 논문집
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• 제16권1호
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• pp.163-177
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• 2020

연구목적: 최근 시설물 유지관리의 중요성이 높아짐에 따라 시설물 유지관리 분야에 첨단기술의 도입과 활용이 증가하고 있다. 첨단기술이 현장에서 실효적 효과를 발휘하기 위해서는 진단장비의 검인증제도를 통한 신뢰성 확보가 필요하나 제도도입에 대한 사회적인 요구와는 별개로 업계의 시각 및 현실적인 기술수준에는 차이가 존재하고 있다. 본 논문에서는 현황에 대한 종합 및 실무자에 대한 의견조사를 통해 합리적인 시설물 진단장비 검인증 제도의 도입 방향을 연구하였다. 연구방법: 시설물 점검 및 진단장비의 첨단기술 도입 및 활용 촉진을 위한 검인증제도 도입 필요성 및 시급성에 대하여 유지관리 및 건설 분야 실무자들을 대상으로 설문조사를 실시하였다. 또한 일본 및 국내 장비 관련 유사인증제도의 비교분석을 통해 첨단 시설물 진단장비에 대한 검인증제도 도입 방향을 검토하였다. 연구결과: 첨단기술 적용에 대하여 실무자 의견은 높은 비율로 유지관리 분야에 드론 및 로봇 등 첨단기술의 도입이 필요하며, 첨단기술 도입 시 현장에서 상당한 효과를 발휘할 것으로 조사되었다. 반면 현재 국내의 기술 수준은 상대적으로 낮아 기술적용에는 일정한 시간이 소요될 것으로 조사되었다. 또한 시설물 진단장비 검인증제도의 도입을 통해 신뢰성 높은 시설물 진단장비 보급될 것으로 조사되었다. 한편, 국내외 진단 및 계측 장비 등에 대한 유사제도 조사결과, 직접적으로 시설물 유지관리에 첨단기술을 적용한 장비를 검인증 하는 제도는 없으며, 다만, 일본에 진단장비의 성능평가 체계가 도입되어 있다. 국내의 융복합기술이 적용된 제품 인증제도 및 운용중인 186개 인증제도 가운데 유사한 21개 계측 및 진단장비 인증제도를 분석하여, 첨단시설물진단장비에 대한 검인증제도 도입방안을 제시하였다. 결론: 실무자들의 의견을 종합하면 시설물 유지관리 분야의 합리화를 위하여 진단장비에 대한 4차 산업혁명 기술의 적용과 신뢰성 높은 진단장비 활용을 지원하는 검인증제도의 도입은 충분한 타당성을 갖는 것으로 볼 수 있다. 그러나 현실적인 과제는 우리나라의 첨단기술 수준이 시급성에 비하여 낮게 평가되고 있어 첨단 시설물 점검 및 진단장비 검인증 제도는 기술적용 및 검증 수준을 고려한 단계적 확대 형태로 시행되어야 한다. 또한 검인증제도 도입과는 별개로 시설물 진단장비 첨단화 촉진을 위한 별도의 투자 및 지원과 노력이 필요 하다.

• Industrial Engineering and Management Systems
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• 제15권3호
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• pp.197-205
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• 2016

The public services closely related to the daily lives of the Japanese people, such as firefighting, police or primary school education, are largely financed by the local governments. As the population as a whole in Japan declines, the population in local regions are forecasted to experience particularly rapid decline in the future, and it is inevitable to reduce the cost of public services provided by the local governments to keep their financial basis sustainable. In order to provide public services to the people properly and fairly, the local governments own and utilize their public facilities, such as fire stations, police stations or primary schools. On the other hand, we have to secure the accessibility, which is the condition of accessing a facility easily in a whole local city including the high population density area and low population density area. In this paper, we propose a method of determining the number of future facilities and its facility locations in which we maintain the present accessibility. In our proposed method, we determine them comparing the accessibility measurement calculated by facility location model using the present and future population. We adopted k-centdian model as the facility location model, which can secure the accessibility in a whole local city determining the weights of both areas. We applied our proposed method to fire station in Iwaki city, Japan. The results suggested that 7 facilities would be reduced in 2064, after 50 years from 2014. Additionally, we confirmed that the future facility location had secured accessibility in both high and low population density area.

• 전기전자학회논문지
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• 제22권1호
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• pp.104-109
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• 2018

본 논문에서는 국내 표준으로 제정된 ARIA 알고리즘을 High Throughput을 위한 하드웨어 구조를 제안하고 구현하였다. 치환 계층의 고속 처리를 위하여 ROM table 구성과 라운드 내부의 파이프라인 방식을 이용하며, 12 라운드를 확장된 구조로 설계하여 병렬 특성을 활용 가능한 설계 방법을 제안한다. 본 논문은 VHDL을 이용하여 RTL 레벨로 설계 되었으며, 합성 툴인 Synplify를 이용하였으며, 시뮬레이션을 위해 ModelSim을 이용하였다. 본 논문에서 제시한 하드웨어 구조는 Xilinx VertxeE Series 디바이스를 이용하였으며 68.3 MHz의 주파수 및 674Mbps의 Throughput을 나타낸다.

• 산업기술연구
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• 제26권B호
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• pp.135-144
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• 2006

The significance of hydro-power plant is increasing in its public roles such as flood control and water supply as well as electric power production. Even if high level of reliability in facility operation is required, no specific reliability research has been made. This specifically stems from the lack of technology and research investments. The eventual goal of this study is to secure a methodology for reliability analysis of hydro-power plant so that an appropriate decision for operation and investment can be made. Specific effort was put to develop a reliability model for water supply system within hydro-power plant. For this study, we briefly examined the overview of the hydro-power plant including the electric power generation facility system. We then discussed the facility reliability analysis methodology for hydro-power plant. Based on rigorous examination of the water supply system and components roles, we drew major failure modes for each component and examined their effects.

• 농촌계획
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• 제23권3호
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• pp.121-131
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• 2017

Although the educational facility are an important considerations on a social equity standpoint, educational environment in rural areas has been continuously deteriorated by numerous social problems such as decreasing birth rate and increasing of local school closing. The purpose of this study is to evaluate the accessibility of educational environment in rural areas on village level. First, we evaluate physical accessibility based on legally defined commuting distance. Second, the implication of village population of potential accessibility is analyzed. Lastly, the facility centrality index of each village is estimated for assessing the relations of educational accessibility. The main results of this study are as follows; (1) The accessibility of most villages in Pyeongchang-gun is vulnerable that 81.10% for elementary school, 73.17% for middle school, and 82.32% for high school, respectively; (2) The average commuting distance per student considering estimated number of students for each educational facilities indicated 2.75km for elementary school, 4.37km for middle school, and 5.79km for high school; (3) the facility centrality index is highly correlated to educational facilities but not to village population.

• 지역연구
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• 제10권2호
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• pp.17-29
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• 1994

This study attempts to examine the regional distribution and the locational pattern of leisure facilities at Kangnam-gu in Seoul. For the convenience of the analysis the facilities are classified into public and private sector and then the facilities are classified into 11 types: mineral spring resort, play ground, neighborhood park, swimming pool, gymnasium, bowling, pingpong, aerobic, golf practice, health, and billiard facilities. For the purpose data was collected from statistical yearbook in 1993 and lists of registered facility at department of living physics of Kangnam-gu office. The data of the density of facilities and the opportunity of facilities per facilities type and per region are analysed with the technology of GIS. Results may be summarized as follows. First of all, correlation between the results of Location-Allocation model and the results of Interaction model is very high. Secondly, on comparing the density of facilities with the opportunity of the facility use per eleven facility types, three discrete spatial pattems are found. The mineral spring resort facility type with the highest unbalanced density and opportunity of facility use is to be found. Play ground, neighborhood park, swimming pool, gymnasium, bowling, pingpong, and aerobic facility types have the high unbalanced density and opportunity of facility use. The golf practice, health, and billiard facility types have spatially balanced density and opportunity of facility use. Thirdly, as comparing the density and the opportunity of the facility use per 'dong' administration unit, the spatial patterns of the public and the private facilities are different in density of the facility use and otherwise two are similar in the opportunity of the facility use. Fourthly, patterns of facilities users have different charateristics based on facility use time, expense, residence, and access time and four regional patterns are to be found ; user favorable, facility profitable, user balanced, and unfavorable.

• 방사성폐기물학회지
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• 제2권1호
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• pp.23-34
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• 2004

To validate the previous conceptual design of cover system, construction of the engineered barrier test facility is completed and the performance tests of the disposal cover system are conducted. The disposal test facility is composed of the multi-purpose working space, the six test cells and the disposal information space for the PR center. The dedicated detection system measures the water content, the temperature, the matric potential of each cover layer and the accumulated water volume of lateral drainage. Short-term experiments on the disposal cover layer using the artificial rainfall system are implemented. The sand drainage layer shows the satisfactory performance as intended in the design stage. The artificial rainfall does not affect the temperature of cover layers. It is investigated that high water infiltration of the artificial rainfall changes the matric potential in each cover layer. This facility is expected to increase the public information about the national radioactive waste disposal program and the effort for the safety of the planned disposal facility.

• 한국공간구조학회논문집
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• 제14권2호
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• pp.87-94
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• 2014

In this study, a smart isolation platform has been developed for control of microvibration of high-technology facilities, such as semi-conductor plants and TFT-LCD plants. Previously, microvibration control performance of a smart base isolation system has been investigated. This study compared microvibration control performance of a smart isolation platform with that of conventional base isolation and fixed base. For this purpose, train-induced ground acceleration is used for time history analysis. An MR damper was used to compose a smart isolation platform. A fuzzy logic controller was used as a control algorithm and it was optimized by a multi-objective genetic algorithm. Numerical analysis shows that a smart isolation platform can effectively control microvibration of a high-technology facility subjected to train-induced excitation compared with other models.