• Nuclear Engineering and Technology
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• 제14권2호
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• pp.86-91
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• 1982

1977년 집합체 cell 중심간의 간격을 53.34cm(162 연료 집합체 저장)에서 36cm(562 연료 집합체저장)로 줄임으로 고리 1호기 부속 기사용 연료 저장 용량을 화장하였다. 확장된 저장 시설에 대하여 Monte Carlo방법을 이용한 KENO-IV코드로 Core Performance Branch에서 제시한 비정상적인 냉각수 밀도 조건에 따라 유효증배계수를 구하였다. KENO-IV결과 밀도 0.1143g/cm에서 최대유효 증배계수 0.9958$\pm$0.0048을 얻었고, 이 값은 US NRC 기준과 CPB기준인 0.98을 초과하므로 새로운 집합체 cell중심간의 간격을 구하였다. 이 과정은 KENO-IV보다 보수적인 결과를 나타내는 확산 코드 KIDD를 이용하여 cell중심간의 간격에 따른 상관 연구로부터 새로운 cell중심간의 간격을 얻었다. 이로부터 현재의 집합체 cell중심 간의 간격 36cm를 43cm 이상으로 늘려야 비정상적인 냉각수 밀도의 감소로 인한 사고의 경우에도 안전함을 알았다.

• 건축역사연구
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• 제30권6호
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• pp.45-58
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• 2021

This study aims to examine the changes in Pyongyang-bu during the late Joseon period and Pyeong-an Gamyeong through gazetteer, pictiroal maps and various literature. The results are as follows. To begin with, unlike other gamyeong, Pyongyang-bu had an exclusive government office facility from the beginning and had a different status because of the route for envoys from Ming. Therefore historical sites related to Gija were important. Second, the importance of Pyongyang city-wall increased even more through the Japanese Hideyoshi invasions in 1592 and the Manchu Invasion in 1636. However, since the post-war restoration was insufficient they focused on defense reducing the size of Pyongyang city wall. Third, as society stabilized, Pyongyangbu's finances were greatly secured. King Sukjong systematically reorganized Pyongyang city wall and facility of Pyongy-an gamyeong. The nothern wall in located high place, Gamyeong and storage in middle height and military force and guesthouse in the center of Pyongyang-bu. I-a and warehouse facilities in the far south were placed around the Daedonggwan. The urban structure that runs from Daedonggwan to Daedongmun was the same as other city. Another pertinent point is Pyeong-an gamyeong had more military facilities and rear garden and pavilion than before. In clunclusion, Pyeong-an gamyeong did not pass through three gates, but only through two gates. And it was characterized by more various space and having more pavilions than other gamyeong.

• Advances in Computational Design
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• 제4권2호
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• pp.155-177
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• 2019

Operation and Maintenance (O&M) phase is the main contributor to the total lifecycle cost of a building. Previous studies have described that Building Information Models (BIM), if available with detailed asset information and their properties, can enable rapid troubleshooting and execution of O&M tasks by providing the required information of the facility. Despite the potential benefits, there is still rarely BIM with Mechanical, Electrical and Plumbing (MEP) assets and properties that are available for O&M. BIM is usually not in possession for existing buildings and generating BIM manually is a time-consuming process. Hence, there is a need for an automated approach that can reconstruct the MEP systems in BIM. Previous studies investigated automatic reconstruction of BIM using architectural drawings, structural drawings, or the combination with photos. But most of the previous studies are limited to reconstruct the architectural and structural components. Note that mechanical components in the building typically require more frequent maintenance than architectural or structural components. However, the building mechanical drawings are relatively more complex due to various type of symbols that are used to represent the mechanical systems. In order to address this challenge, this paper proposed a symbol recognition framework that can automatically recognize the different type of symbols in the building mechanical drawings. This study applied vector-based computer vision techniques to recognize the symbols and their properties (e.g., location, type, etc.) in two vector-based input documents: 2D drawings and the symbol description document. The framework not only enables recognizing and locating the mechanical component of interest for BIM reconstruction purpose but opens the possibility of merging the updated information into the current BIM in the future reducing the time of repeated manual creation of BIM after every renovation project.

• 대한토목학회논문집
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• 제28권3D호
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• pp.383-390
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• 2008

우리나라의 건설안전 관리시스템은 그동안 꾸준히 개선되어 왔으나 재해강도율은 감소되지 않고 있고 건설산업의 안전수준도 향상되지 못하고 있는 실정이다. 재해강도율을 감소시키기 위해서는 건설현장에서의 안전관리도 중요하지만 안전설계 의무화 및 설계 안전성 평가의 도입이나 건설업 산업안전보건관리비의 효과적인 사용방안 등 제도적인 틀을 개선하는 것이 필요하다. 그 중 안전관리비는 낙찰률에 따라 당초 설계금액보다 줄어드는 문제와 현장에서 사용시 안전관리자 등의 인건비에 비해 안전시설비용이 상대적으로 적게 집행되는 문제점이 있다. 본 연구는 건설업 재해강도율이 감소하지 않는 주요원인을 살펴보고 그 원인을 제거할 수 있는 방안으로 안전관리비와 관련된 문제점 분석을 통해 효과적인 개선방안을 제시함으로써 건설현장의 재해강도율을 낮추는데 기여하고자 한다.

• 터널과지하공간
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• 제34권1호
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• pp.54-70
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• 2024

생산이 완료된 노천광산 채굴적을 광미(광물찌꺼기) 적치 장소로 활용하는 방안은 기존 광미 적치 시설(TSF, Tailing storage facility)의 설치 공간 및 운영비용 문제 해결을 위한 대안으로 제시된다. 하지만 장기간에 걸쳐 적치된 광미는 주변 암반에 추가적인 하중으로 작용하여 광산의 역학적 안정성을 저해할 위험성이 존재한다. 본 연구에서는 호주 Marymia 광산의 사례를 참고하여 약 60,400 시간에 걸친 광미 적치 시나리오를 구축하였으며, 다양한 지하 채광장 형태 및 암반 조건에 따른 천반 수평필러의 역학적 안정성을 Sigma/W 해석 소프트웨어를 활용하여 분석하였다. 분석 결과, 광미 적치가 장기간 지속됨에 따라 천반 수평필러의 파괴 가능성이 유의미하게 증가함을 확인하였다. 해당 결과는 노천채굴적 내 광미 적치 시 광산 구조에 대한 역학적 안정성 고려가 필수적임을 시사한다.

• 상하수도학회지
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• 제37권6호
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• pp.335-345
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• 2023

In Korea, as part of the Green New Deal project toward a carbon-neutral society, it is necessary to build a climate-resilient urban environment to green the city, space, and living infrastructure. To this end, SWMM-ING was improved and the model was modified to analyze the carbon reduction effect. In addition, I plan to select target watersheds where urbanization is rapidly progressing and evaluate runoff, non-point pollution, and carbon reduction effects to conduct cost estimation and optimal design review for domestic rainwater circulation green infrastructure. In this study, green infrastructure facilities were selected using SWMM-ING. Various scenarios were presented considering the surface area and annual cost of each green infrastructure facility, and The results show that the scenario derived through the APL2 method was selected as the optimal scenario. In this optimal scenario, a total facility area of 190,517.5 m² was applied to 7 out of 30 subwatersheds to achieve the target reduction. The target reduction amount was calculated a 23.50 % reduction in runoff and a 26.99 % reduction in pollutant load. Additionally, the annual carbon absorption was analyzed and found to be 385,521 kg/year. I aim to achieve additional carbon reduction effects by achieving the goal of reducing runoff and non-point pollution sources and analyzing annual carbon absorption. Moreover, considering the scale-up of these interventions across the basin, it is believed that an objective assessment of economic viability can be conducted.

• 한국병원경영학회지
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• 제1권1호
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• pp.188-202
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• 1996

Telehealth is widely tested in the U.S.A and other developed countries. This system is expected to solve rural health problems reducing professional isolation. Some demonstration projects showed that the system can provide quality care in reasonable prices to rural residents. However, few study has been done on whether telehealth system can attract physicians by reducing professional isolation. The system is not available to most of the rural hospitals because the price for the equipment and telephone charges are not low enough. It is promising that the system cost and telephone charges are decreasing gradually. As time passes, rural hospitals will be more viable for the system. Satisfaction of the physicians and patients is a key factor for the implementation of the system. The physicians need to understand more about telecommunication and computer systems. After physicians are well-versed about the system, we can expect wide use of telehealth in rural areas. Effort for the confidentiality and standardization should be devoted to assure patient's privacy and compatibility of patient records and exam results. In Korea, two projects are being operated in Uljin and Kurye. A study evaluated the economic efficiency of the projects suggesting that increase of the number of patients up to three times of current number or decrease in hardware costs and telecommunication charges into two thirds of the current costs. The hardware and telecommunication charges are decreasing. Another area telehealth system can be applied is psychiatric accommodation facilities. Establishment of telehealth in the psychiatric facilities will increase the access of psychiatric care for patients and is expected to be economically efficient.

• 한국전자거래학회지
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• 제25권1호
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• pp.109-121
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• 2020

본 연구의 목적은 미세먼지를 줄이고 국민 삶의 질을 개선하기 위해 정부와 지방자치단체간의 역할분담과 협업을 하는 정책수립과정에서 도입하려는 정책의 우선순위를 도출하는 것이다. 심각한 미세먼지 문제는 건강뿐만 아니라 경제 특히 상거래에도 많은 영향을 미치고 있으나, 아직 미세먼지 저감 정책 선정에 관한 연구는 많지 않은 실정이다. 본 연구에서는 환경부와 지자체의 환경정책전문가, 학계 및 환경업계 전문가 25명을 대상으로 AHP 방법론을 사용하여 조사 및 분석하였다. 상위계층은 교통, 생산시설, 생활환경 및 도시계획 관리 분야의 4개로 나누고 각 분야는 다시 3개씩 세분화하여 12개의 정책을 선별하였고, 생산업의 대기오염 감축 의무화 및 공장가동 중단이 가장 우선시되는 정책으로 분석되었다. 본 연구결과는 향후 미세먼지와 관련된 정책 수립 시 가이드라인으로 활용할 수 있다.

• 한국안전학회지
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• 제33권1호
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• pp.128-134
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• 2018

With the increase in frequency of typhoons and heavy rains following the climate change, the scale of damage from the calamities in the mountainous areas has been growing larger and larger, which is different from the past. For the case of Korea where 64% of land is consisted of the mountainous areas, establishment of the check dams has been drastically increased after 2000 in order to reduce the damages from the debris flow. However, due to the lack of data on scale, location and kind of check dams established for reducing the damages in debris flow, the measures to prevent damages based on experience and subjective basis have to be relied on. Under this study, the high-precision DEM data was structured by using the terrestrial LiDAR in the Jecheon area where the debris flow damage occurred in July 2009. And, from the numerical models of the debris flow, Kanako-2D that is available to reflect the erosion and deposition action was applied to install the erosion control facilities (water channel, check dam) and analyzed the effect of reducing the debris flow shown in the downstream.After installing the erosion control facilities, most of debris flow moves along the water channel to reduce the area to expand the debris flow, and after installing the check dam, the flow depth and flux of the debris flow were reduced along with the erosion. However, as a result of analyzing the diffusion area, flow depth, erosion and deposition volume of the debris flow generated from the deposition part after modifying the location of the check dams with the damages occurring on private residences and agricultural land located on the upstream area, the highest reduction effect was shown when the check dam is installed in the maximal discharge points.

• 환경생물
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• 제35권4호
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• pp.654-661
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• 2017

축산폐수에 기인한 오염 물질 저감을 위해 최근 축산폐수처리 후속공정으로 인공습지와 같은 자연친화적인 처리법이 제안되고 있다. 따라서 본 연구는 자연친화적 공법이 수생태독성 저감에도 효과적인지 알아보기 위해 다양한 공정의 인공습지를 제작하여 축산폐수 시료를 대상으로 처리 전후 오염저감율 및 물벼룩 급성 독성 변화를 분석하였다. 본 실험결과, 비록 갈대의 유무 및 종류, 그리고 여재의 종류에 따른 영향은 없으나 인공습지에 처리된 경우 유입수에 비해 TN, TP, COD 농도 저감과 더불어 생태독성 영향이 감소하였다. 따라서 일반 갈대는 물론 바이오갈대와 바이오여재를 사용한 인공습지는 축산폐수의 TN, TP, COD 저감은 물론 생태독성 감소에도 효과적인 공법으로 판단된다. 향후 가축분뇨 정화시설과 연계한 후속처리공정으로 적용하기 위해서는 다양한 성상의 축산폐수를 대상으로 처리효율과 생태독성시험이 연계된 통합평가가 필요한 것으로 사료된다.