• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.73-75
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• 2018

최근의 하천복원 사업은 제외지 중심의 하천복원에서 벗어나 제내지의 격리 차단된 구하도까지 복원하고자 하는 노력이 시도되고 있다. 그러나 하천복원에 따른 수리적 및 생태적 연결성 향상이 적절히 수행되는지에 대한 정량적 평가 수단이 부족한 상태다. 본 연구에서는 구하도 복원에 따른 생태적 연결성 평가수단으로서 복원전 후 수리해석 결과를 이용하여 대상어종의 서식처적합도지수(HSI)와 식생의 공간분포를 분석 또는 예측할 수 있는 모형을 개발하였다. 공간분포된 수리특성을 위해서는 2 3차원의 모형이 필요하지만 복잡한 계산과정, 고도의 기술 및 많은 시간과 비용이 필요하다는 점에서 접근이 용이하지 않다. 이에 1차원 홍수추적모형의 결과를 이용하여 1차원 수리특성을 2차원으로 확장시키는 수치모형도 함께 개발하였다. 다만 개발된 각 모형의 단계별 실행 결과는 개별적인 요소의 평가로서 그 의미가 작으므로 하천복원의 종합적 평가를 위한 수리-물리서식처-식생의 통합적 모의가 필요하다 개발된 모형의 사용성 증대 및 생태적 연결성 평가 통합모형으로의 발전을 위해 개발된 모형을 하나의 연동시스템으로 구축하고자 하며, 연동 시스템을 이용하여 수리적 및 생태적 연결성을 신속하고 간단하게 해석할 수 있다.

• Journal of the Korean Society for Library and Information Science
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• v.50 no.3
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• pp.93-112
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• 2016

This study is an analysis on the needs assessment of school library facilities in Korea. After exploring KLA's Standards for Korean Libraries, IFLA's School Library Guidelines and AASL's Empowering Learners, the needs assessment tool of school library facilities was proposed in the previous study. The tool contains 10 major properties on school library facilities. This study gathered data from 507 students and 134 teacher librarians. The result of analysis is as follows: Students and teacher librarians evaluated the importance of library facilities more highly than the current level of facilities. Collection access, convenience and space are revealed more important properties to students and good environment, expandability, collection access are more important to teacher librarians among the properties.

• Journal of KIISE:Databases
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• v.28 no.3
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• pp.512-527
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• 2001

In a client-server spatial database, it is desirable to maintain the cached data in a client side to minimize the communication overhead across a network. This paper deals with the issues of concurrency and consistency of map updates in this environment. A client transaction to update map data is an interactive work and takes a long time to complete it. The map update in a client site may affect the other sites'updates because of dependencies between spatial data stored at different sites. The concurrent updates should be propagated to the other clients as well as the server to keep the consistency of map replicated in a client cache, and also the communication overhead of the update propagation should be minimized not to lose the benefit of caching. The newly proposed cache region locking with CR lock and CX lock controls the update dependency due to spatial relationships. CS lock and COD lock are suggested to use optimistic detection-based approaches for guaranteeing the consistency of cached client data. The cooperative update protocol uses these extended locking primitives and Spatial Relationship-based 2PC (SR-based 2PC). This paper argues that the concurrent updates of cached client spatial data can be achieved by deciding on collaborative updates or independent updates based on spatial relationships.

• Journal of Korea Spatial Information System Society
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• v.2 no.2 s.4
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• pp.49-58
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• 2000

With the growing realization that the GIS data management becomes important more than ever, a great deal of the spatial data is being digitalized through various GIS projects, such as NGIS project. However, the integrated search and analysis for GIS data are highly constrained by the databases being heterogeneous and distributed among organizations. This paper is to introduce the system developed to solve the problem of interoperability in the heterogeneous and distributed databases environment. The system architecture is presented which is composed of spatial data servers, nodes, and a gateway. Also, the paper provides the implementation details of the client application to access and analyze the distributed and heterogeneous spatial data with the standardized interface. Finally, based on the technical architecture, the korea spatial data infrastructure is explained.

• Spatial Information Research
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• v.11 no.4
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• pp.341-358
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• 2003

Korean government has conducted National Geographic Information System(NGIS) project since 1995. The NGIS was set up and directed by central government to stimulate the growth of GIS field in Korea. Thanks to the project, all aspects of GIS in Korea has been rapidly developed. However, this government-led strategy now reveals some limitations on the advancement of GIS in Korea It is time to prepare new approaches for the further development of GIS in Korea. This study aims at introducing the concept and model of National Spatial Data Infrastructure(NSDI) and suggesting strategies fir it. By doing so, this research attempts to reestablish the role of government and draws new policy directions for the NGIS.

• 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.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2004.03a
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• pp.511-516
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• 2004

수치표고모델, 정사영상과 같은 공간영상정보를 구축하기 위해서는 입체영상을 이동한 영상정합(image matching)의 과정이 필수적이며, 단영상 또는 스테레오 영상을 이용하여 대상물의 3차원 정보를 재구성하고 복원하는 기술은 사진측량 및 컴퓨터 비전 분야의 주요 연구 중의 하나이다. 본 연구에서는 화소값의 유사성과 상호관계성을 고려하는 MRF 모델을 이용하여 영상정합을 수행하였다. MRF 모델은 공간분석이나 물리적 현상의 전후관계(contextural dependencies)의 분석을 위한 확률이론의 한 분야로 다양한 공간정보를 통합할 수 있는 방법을 제공한다. 본 연구에서는 기준영상의 화소에 시차를 할당하는 접근 방법으로 확률모델의 일종인 마르코프 랜덤필드(MRF)모델에 기반한 영상정합기법을 제안하였고, 공간내 화소의 상호관계를 고려해주므로 대상물의 경계부분에서의 매칭 정확도를 향상시켰다. 영상정합문제에서의 MRF 기본가정은 영상 내 특정화소의 시차는 그 주위화소의 시차에 의한 부분정보에 따라 결정이 가능하다는 것이다. 깁스분포(gibbs distribution)를 사용하여 사후(posteriori) 확률값을 유도해내고, 이를 최대사후확률(MAP: Maximum a Posteriori)추정법을 이용하여 에너지함수를 생성하였다. 생성된 에너지함수의 최적화(Optimization)를 위하여 본 연구에서는 전역최적화기법인 multiway cut 기법을 사용하여 영상정합에 있어 에너지함수를 최소로 하는 이미지화소에 대한 시차레이블을 구하여 영상정합을 수행하였다.

• Journal of the Economic Geographical Society of Korea
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• v.22 no.2
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• pp.111-122
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• 2019

This study attempts to analyze the critical issues of globalization and present an alternative framework that places ICT in the function of development in comparative perspective. To adjudicate the controversies concerning the effect of developmental factors, it examines the determinants of global trend that leads to the comprehensive mechanism of ICT and cultural residues. The advent of the global community in cyber space requires a new balancing point by the mode of communication and culture among all societies and operation with decentralized authority. This interdependence, by providing diverse network structures and participating in cyberspace, includes the power shift from the dynamics of international relations with voluntary collaboration and brings some important implications for a global empathetic society.

• Design Convergence Study
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• v.16 no.3
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• pp.17-37
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• 2017

The purpose of this study is to evaluate the value of the center of age-friendly goods to confirm the public value of the center. 152 elderly participants, either who have utilized the center themselves or who have experienced the center indirectly through the image have participated in the study. The experience of age-friendly product center was evaluated by the contingent valuation method, which is widely used in the public services. A double-bounded dichotomous choice (DB-DC) log-logistic model and a log-normal model were conducted. As the result of the estimation, the truncated mean of the log-logistic model was 3,401 Korean won, with the mean of 4,937 won. In addition, the truncated mean of the log-normal model was 3,433 won, with the mean of 4,144 won. Elderly who have not experienced the center placed a higher value on the center, compared to the experienced elderly. The results imply the necessity to enlarge the opportunity for future suppliers to experience the center for age-friendly products, in order to improve their objective understandings. In addition, the necessity of expanding exhibition products and applying age-friendly designs is proposed, to offer various attractive experiences to elderly.

• 한국지형공간정보학회:학술대회논문집
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• 2004.10a
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• pp.5-10
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• 2004

The purpose of this research is to measure a gravitational attraction about urban pulbic service facilities and to evaluate the location of public service facilities. It is important in that these facilities should provide more inexpensive and convenience public service to users. To do this, the GIS's spatial analysis and gravity model were used to analyze the efficiency of the public facilities. The gravity model was conducted as the main analysis method, and another model for this analysis was the discrete model. The gravity model is originally to anticipate migration flows, traffic flows and other types of movements so that this model compares the gravitational attraction between places. The discrete model is to find the optimal location and to evaluate a location of facility regarding urban areas as the combination of node and link. In this research, these two models were adopted to compare and analyze location of Mapo-Gu Office. The results of this research indicated that the locational evaluation of urban public service facilities discovered the appropriateness of those facilities, and the public facilities was necessary to displace to other site.