• Korean Journal of Geomatics
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• 제1권1호
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• pp.7-13
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• 2001

Geospatial Information Systems (GIS) have been employed to systematically manage and design land use in urban areas. This has increased the need for more accurate vector and raster data. In Korea, l/l,000-scale digital maps are used as vector data for the facility management in urban areas. This has increased the need for large scale orthoimages. Orthoimages generated from aerial imagery can provide accurate information, making possible the more effective city management. However, there is a large problem in using the orthoimages, i.e., currently available conventional orthoimages have not been generated based on Digital Elevation Model (DEM) that takes into account the building heights. So this causes the displacements of building image in large scale orthoimages. The present study is an attempt to generate the large scale orthoimages based on building DEM. The semiautomatic building extraction method can detect building outlines by mouse clicking on either building roofs or corners. Building DEM, based on the outline and calculated building height, was used to produce the large scale orthoimages with the corrected building occlusion.

• 상하수도학회지
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• 제26권2호
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• pp.303-312
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• 2012

Water supply and sewerage systems are the large-scale urban infrastructure ejecting large amount of environmental load over the life-cycle. Therefore, it is important not only to optimize in the aspect of economical superiority and process efficiency but also to consider earth scale environmental impact. This study aimed to suggest the establishment of life cycle management(LCM) system as an integrated management solution in urban water supply and sewerage systems. As a result, the methodology for LCM system consisting of life cycle assessment(LCA), life cycle cost(LCC), life cycle $CO_{2}(LCCO_{2})$ and life cycle energy(LCE) was developed. Also, several case studies using the latest statistics data of water supply and sewerage systems were carried out to investigate the field applicability of LCM.

• 한국산업경영시스템학회:학술대회논문집
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• 한국산업경영시스템학회 2002년도 춘계학술대회
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• pp.51-56
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• 2002

A Korea next-generation high-speed rail system represents a typical example of large- scale multi-disciplinary systems, consisting of subsystems such as train, electrical hardware, electronics, control, Information, communication, civil technology etc. The system design and acquisition data of the large-scale system must be the subject under strict configuration control and management. The system therefore, must be developed using systems engineering that is a efficient and effective methodology to design such a complex system and manage its development. This paper presents the results from a computer-aided systems engineering application to the Korea next generation high-speed railway project. Especially, the focus of the study was on requirement management and PBS management.

• 대한전기학회논문지:전력기술부문A
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• 제50권2호
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• pp.67-75
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• 2001

This paper presents a fast and effective methodology for service restoration in large-scale distribution systems. The service restoration problem is formulated as a constrained optimization problem and requires the fast computation time and superior solution because the more unfaulted out-of-service area should be restored as soon as possible. The proposed methodology is designed to consider the fast computation time and priority service restoration by dijkstra algorithm and fuzzy theory in large-scale distribution systems. Simulation results demonstrate the validity and effectiveness of the proposed on a 26-bus and 140-bus system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.640-642
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• 2008

This paper presents the design, development and performance of a 250kW power conditioning system(PCS) for large scale photovoltaic power plant. The PV inverter consists of a three phase IGBT stack, L-C filter, transformer and HMI unit for monitoring. To verify the performance of the PV inverter a testing facility was designed and constructed to simulate the characteristics of the solar cell and grid.

• 한국BIM학회 논문집
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• 제6권3호
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• pp.24-33
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• 2016

Planning occurs from day-to-day, small-scale decisions to large-scale infrastructure investment decisions. For that reason, various attempts have been made to appropriately assist decision-making process and its optimization. Lately, initiation of a large amount of data, also known as big data has received great attention from diverse disciplines because of versatility and adoptability in its use and possibility to generate new information. Accordingly, implementation of big data and other information management systems, such as geographic information systems (GIS) and building information modeling (BIM) have received enough attention to establish each of its own profession and other associated activities. In this extent, this study illustrates a series of big data implementation cases that can provide a lesson to urban planning domain. In specific, case studies analyze how data was used to extract the most optimized solution and what aspects could be helpful in relation to planning decisions. Also, important notions about GIS and its application in various urban cases are examined.

• 한국지능시스템학회논문지
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• 제25권1호
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• pp.15-21
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• 2015

커널에 대한 모수의 조절은 서포트 벡터 기계의 일반화 능력에 영향을 준다. 이와 같이 모수들의 적절한 값을 결정하는 것은 종종 어려운 작업이 된다. 서포트 벡터 회귀에서 이와 같은 모수들의 값을 결정하기 위한 부담은 앙상블 학습을 사용함으로써 감소시킬 수 있다. 그러나 대용량의 자료에 대한 문제에 직접적으로 적용하기에는 일반적으로 시간 소모적인 방법이다. 본 논문에서 서포트 벡터 회귀의 모수 조절에 대한 부담을 감소하기 위하여 원래 자료집합을 유한개의 부분집합으로 분해하는 방법을 제안하였다. 제안하는 방법은 대용량의 자료들인 경우와 특히 불균등 자료 집합에서 효율적임을 보일 것이다.

• 대한안전경영과학회지
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• 제14권3호
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• pp.1-10
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• 2012

Recently, we have witnessed the definitely negative impacts of large-scale accidents happened in such areas as atomic power plants and high-speed train systems, which result in increased fear for the potential danger. The problems appear to arise due to the deficiency in the design of large-scale complex systems. One of the causes can be attributed to the design process that does not fully reflect the safety requirements in the early stage of the system development because of the substantially increased complexity. In this paper, to enhance the systems safety an integrated process is studied, which considers simultaneously both the system design process and system safety process from the beginning of the system development. In the conceptual system design phase an integrated process model is constructed by analyzing the activities of both the system design and safety processes. As a case study example, an inner city train system is described with the application of the developed process. The computer simulation of the example case is followed by the result discussed. The results obtained in the paper are expected to be the basis for the future study where a detailed process and its associated activities can be developed.

• 한국전자통신학회논문지
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• 제7권5호
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• pp.1095-1101
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• 2012

최근 데이터 양이 폭발적으로 증가함에 따라, 데이터를 저장하고 검색하고 다루기 위한 대규모 데이터베이스 시스템이 등장하였다. 이 환경에서는 일관성과 가용성, 결함 허용 등 다양한 이슈가 존재한다. 이 논문에서는 데이터 관리와 트랜잭션 관리가 분리된 구조를 갖는 대규모 데이터베이스 시스템에서, 효율적인 범위 질의 방법에 대하여 다룬다. 동일한 구조에서 두 모듈의 독립성을 보장하고, 팬텀 문제를 해결하기 위하여 파티션을 이용한 범위 질의 방법에 대한 연구가 있었지만, 범위 질의가 키 값으로 명세되는 경우에만 효율적이었다. 이에 이 논문에서는 키 값이 아닌 다른 속성으로 범위 질의가 주어질 때 효율을 개선할 수 있는 방법을 제안하고자 한다. 제안하는 방법에서는 분리된 두 모듈의 독립성은 보장하며, 부분 인덱스를 사용함으로써 범위 질의를 위한 오버헤드를 줄일 수 있다.

• 토지주택연구
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• 제1권1호
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• pp.113-124
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• 2010

이 연구는 신도시 및 대규모 택지개발 지구내 신교통 시스템을 도입함으로써 예상되어지는 효과를 분석하고, 이에 대한 적용 가이드라인을 제시한 것이다. 이를 위해 각 신교통 시스템 및 유형별 복합카테고리를 설정하여 지역적 특성을 반영하고자 하였으며, 신교통 시스템 도입이 기존의 대중교통체계 및 간선도로를 대체함으로써 발생되어지는 사회적 편익을 산출하였다. 분석결과, 신교통시스템 도입은 교통혼잡비용 감소, 탄소저감, 각 지자체의 친환경적 정책 입안에 뚜렷하게 기여할 수 있는 것으로 밝혀졌다. 그러나 신교통시스템의 이러한 장점에도 불구하고 이 연구에서는 신교통시스템을 도입하고자 하는 지자체에서는 무엇보다도 지역여건에 부합하는 신교통 시스템 유형을 선별하는 것이 중요함을 강조하고 있다. 특히 지자체의 무분별한 신교통시스템 도입은 대규모 택지개발사업에 의한 분양가 상승으로 이어질 가능성이 매우 높기 때문이다.