• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.101-104
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• 2004

R-Tree 색인은 기존의 공간 데이터베이스관리시스템에서 공간 데이터 검색을 위하여 많이 사용되고 있는 공간 색인기법이다. 하지만 R-Tree 색인에서 기존의 잠금(Lock) 기반 동시성 제어는 갱신연산의 잠금으로 인해 검색연산의 블록킹 오버헤드(blocking overhead)가 발생한다. 본 논문에서는 R-Tree 색인에서 검색연산의 블록킹 오버헤드의 주요 원인이 되는 노드 분할 연산과 MBR(Minimum Bounding Rectangle) 갱신연산에 대해 각각 노드단위와 노드엔트리 단위의 버전(Version)을 생성하고 유지하여 동시에 발생하는 검색연산이 갱신연산으로 인한 지연이 없이 자신에 알맞은 버전을 읽음으로써, 검색성능을 높일 수 있는 버전 기반의 동시성 제어 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.401-402
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• 2009

정보화 기술의 발전과 더불어 GIS의 대중화에 따라, 다양한 형태와 주제로 공간 정보를 제공하는 수치지도의 수요가 증가하고 있다. 기존의 수치지도 데이터는 도엽 단위로 관리하기 때문에 관리 및 갱신을 효율적으로 지원하기 어렵다. 이 논문에서는 이러한 문제를 해결하기 위해 객체의 연속적인 표현, 객체 단위의 갱신 및 이력관리가 가능한 UFID기반의 수치지도 데이터 모델을 제안하였다. 제안한 모델은 각 지형지물에 새로운 UFID를 부여하여 연속적인 지형지물 표현과 갱신으로 인한 지형지물별 이력 관리가 가능하도록 하였다. 마지막으로 제안된 모델의 효율성을 검증하기 위하여 타당성을 분석하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.806-813
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• 2005

시계열의 구조를 정확히 파악하기 위해서는 구조변화와 단위근의 존재여부를 가설 검정하는 것이 필요하다. 하지만, 이 두 가지의 가설들은 각각 검정되어 왔고, 이에 따라 단위근도 존재하고 구조변화도 존재하거나, 어느 하나만 존재하는 시계열들을 구분하여 파악하는 데에 있어서는 한계점이 있었다. 이 논문에서는 상태공간모형과 시뮬레이션 방법에 근거하여 두 가지 가설을 동시에 검정하는 절차를 제시하여 논란이 되는 시계열들에 대해 합리적인 해결책을 제시하고자 한다.

• Journal of the Korean Geographical Society
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• v.48 no.6
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• pp.879-896
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• 2013

The assessed land values and housing prices have been widely utilized as a basic information for the land and house trades and for evaluating governmental and local taxes. However, there exists a price difference in actual markets between the assessment level and assessed land values or housing prices. This paper emphasizes the spatial mismatch between the assessed land values and housing market prices and particularly addresses the following two aspects by focusing on spatial effects of the modifiable areal units, which would substantially affect the estimation of the assessed land values and housing prices. First, we examine the spatial distributions of the assessed land values and housing market prices, and the gap between those prices, on the basis of the aggregated spatial units(i.e., aggregation districts). Second, we explore the scale effect of the MAUP(modifiable areal unit problem) generally embedded in estimating the prices of the sampled standard lands and houses, and calibrating the correction index for the land values and housing prices for the individuals. For the application, we analysed the land values and housing prices in Seoul utilizing GIS and statistical software. As a result, some spatial clusters that the housing market prices are significantly higher than the assessed land values were identified at a finer geographic level. Also, it was empirically revealed that the statistical results from the regression of regional variables on the assessed land values for the individuals are significantly affected by the aggregation levels of the spatial units.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.39 no.6
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• pp.571-585
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• 2021

Various studies have analyzed urban decline at a universal level using the general characteristics of declining cities. However, urban decline at the city level should be considered because this decay occurs based on the unique attributes of a particular city. In addition, since this phenomenon occurs and spreads in microspaces, studies should consider smaller spatial units continuously. This study aims to develop an urban decline measurement model that considers regional characteristics to analyze the urban decline of Ulsan Metropolitan City over time and space. The index value of Ulsan, compared to the national average, is calculated and reflected in the weight to reflect regional characteristics in the model. In addition, after analyzing urban decline by administrative dong units, we also performed analysis by counting district units using spatial hierarchical structure to demonstrate evaluation on smaller unit spaces. As a result of analyzing urban decline patterns by associating the index calculated using the model with the social phenomenon of Ulsan Metropolitan City, urban decline formed clusters and spread to adjacent regions over time. In addition, results confirmed that external factors such as new towns and urban regeneration projects affect urban decline. By illustrating the degree of urban decline proposed measurement model used in this study, it is possible to present the priority of areas required for urban regeneration projects. Results are also helpful to test the effectiveness of completed or presently-implemented urban regeneration projects.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.383-385
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• 1998

ISO에서 문서 교환에 대한 표준으로 제시된 SGML(Standard Generalized Markup Language)은 논문이나 보고서와 같이 내부적으로 복잡한 구조를 가지는 문서를 효과적으로 처리하기 위해 매우 융통성 있는 문법을 제공하고 있다. 이에 각 기업체나 행정기관에서는 기존의 전자 문서들을 SGML 문서로 변환하는 작업이 활발히 진행되고 있다. 따라서 문서의 논리적 구조에 기반한 검색에 대한 요구도 크게 증가하고 있다. 본 연구에서는 SGML 문서의 기본단위인 엘리먼트 단위의 검객과 문서의 논리적인 구조에 기반한 검색을 효율적으로 지원하는 인텍스를 설계하기 위해, K-ary 트리, 문서단위 구문트리와 엘리먼트단위 구문 트리의 3가지 방법에 대해 저장 시간, 삭제 시간, 검색 시간, 부가 저장 공간 측면에서 수학적 모델로서 성능평가를 수행한다.

• Journal of Cadastre & Land InformatiX
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• v.45 no.1
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• pp.45-58
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• 2015

The Korean government strives to transform the society from one that stresses academic and qualification to one that stresses individual competencies. National Competency Standards(NCS) has been adopted to this end. However, NCS classifies cadastre into a group with survey and spatial information collection. Such classification limits cadastre to encompass cadastral administration, cadastral survey, geospatial survey, etc. This study reviews current status and implications of NCS, and proposes few solutions: improvement of classification system, introduction of cadastral industry cooperation model, curriculum development based on competency level, unification between NCS developer and learning module writing group, etc.

• KIEAE Journal
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• v.17 no.5
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• pp.87-94
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• 2017

Purpose: Prefabricated modular space such as a container construction has recently been interested unlike the conventional construction method, and their scale have expanded from small buildings such as cafes, houses and pensions to shopping centers, complex cultural spaces where shows and exhibitions are possible doing. In this way, the container is in the spotlight as an advantage such as mobility, flexibility, correspondence, economic efficiency, recyclability and so on. However, there are no specific guidelines and standard design methods in aspects of structural calculation, functional insulation and environmental configuration. Therefore, as the first step to resolve these problems, this study has focused on the field of environmental performance of container construction, presented appropriate guidelines and searched ways to improve performances. Method: For this study, seven types of the modular building were chosen and compared, and their energy performances have been analyzed using a proven simulation tool. Essential methodology and terminology were examined to estimate and judge their efficiency. Result: In conclusion, energy performances depend on specific configuration of combined unit spaces, and design guidelines cold be set up for promoting their use in the practical field.

• The Journal of the Korea Contents Association
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• v.6 no.8
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• pp.105-113
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• 2006

For reasonable planning and decisions, spatial Planners should gather and analyse land use information which includes lots, zoning, population, households, buildings, usage, and etc. This study aims to define the demands of land use information for spatial planning. From literature reviews, case studies, and survey, this study shows those findings as following. First most spatial planners suffer from the difficulty of gathering land use information. Second, the priority order of the information could be shown by survey. Third, the unit and renewal period of the spatial information could be defined. Those findings could be a base of information systems for spatial planning.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.3 s.33
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• pp.15-24
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• 2005

The Land Suitability Assessment(LSA) that was introduced to prevent the unplanned development was viewed from it has applied the same assessment factor on inland and island that has a many different spatial and physical properties, it have many problems. To study the efficient LSA in island that has an totally different spatial, local properties, assessment unit(AU) which the zone of life was considered and on this based, assessment factor was developed. In the AU, middle sized life zone was the best AU to present the regional land properties. In the distance analysis, distance analysis that considered sea was suggested and use it, we ran present the assessment method that was considered the access between islands.