• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.06a
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• pp.143-149
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• 2008

전 지구적 기온상승으로 인하여 해수면 상승 및 자연생태계가 파괴되고 있다. 이에 Geo 관련 연구자들은 지구 온난화, 이산화탄소 배출량, 미세먼지 확산 등의 방대한 지구환경정보를 공유 및 교환하고 활발한 지식 교류를 하기 위한 포털 환경이 요구되고 있다. 국외 여러 환경단체들은 이러한 포털 환경구축을 통해 지구 환경정보를 연구하고 있다. 한국에서도 지구온난화 영향분석, 미세먼지 확산분석, 이산화탄소 배출량 분석 지상 식생변화 모니터링 등의 분야에서 위성 관측 영상 및 지구환경자료를 이용한 서비스가 더욱 절실하다. e-Science 환경 구축의 대표 응용 분야 중의 하나로 발전, 확산시킬 필요성 때문에 정확하고 방대한 지식정보의 신속한 처리 및 서비스를 할 수 있는 GeoGrid 기반 기술 개발 방법과 환경 구축 방법에 대해 연구하였다.

• Journal of Korean Society for Geospatial Information Science
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• v.19 no.3
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• pp.107-114
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• 2011

In this study, when interpreting leakage using the concept of geographical dispersion based on grid, to choose an appropriate spatial resolution, the statistical characteristics of drainage path length and the pattern of change of hydrodynamic parameters have been observed. Drainage path length has been calculated using an 8-direction algorithm from digital elevation model, from which the hydrodynamic parameters of the watershed were estimated. The scales of topographical map for this analysis are 1:5,000 and 1:25,000, appling grid sizes 5, 10, 15, 20 m and 20, 30, 50, 100, 150, 200 m, respectively. As results of this analysis, depending on the scale of stream networks, the statistical characteristics of drainage path length by spatial resolution and hydrodynamic parameters of the watershed have been changed. Based on the above results, when interpreting leakage using the concept of the geographical dispersion based on grid, in the case of 1:5,000 scale topographical map, a spatial resolution of 5 m will be better showing geographical and hydrodynamic characteristics to apply to the well developed stream network in basins, spatial resolution of 5~20 m to the less developed stream network in basins. And in the case of 1:25,000 scale topographical map, spatial resolution below 50 m is more desirable to show above two characteristics to apply to both cases.

• Journal of Korean Society for Geospatial Information Science
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• v.24 no.1
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• pp.25-33
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• 2016

In order to visualize point based Location-Based Social Network Services(LBSNS) data on multi-scaled tile map effectively, it is necessary to apply tile-based clustering method. Then determinating reasonable numbers and size of tiles is required. However, there is no such criteria and the numbers and size of tiles are modified based on data type and the purpose of analysis. In other words, researchers' subjectivity is always involved in this type of study. This is when Modifiable Areal Unit Problem(MAUP) occurs, that affects the results of analysis. Among LBSNS, geotagged Twitter data were chosen to find the influence of MAUP in scale effects perspective. For this purpose, the degree of spatial autocorrelation using spatial error model was altered, and change of distributions was analyzed using Morna's I. As a result, positive spatial autocorrelation showed in the original data and the spatial autocorrelation was decreased as the value of spatial autoregressive coefficient was increasing. Therefore, the intensity of the spatial autocorrelation of Twitter data was adjusted to five levels, and for each level, nine different size of grid was created. For each level and different grid sizes, Moran's I was calculated. It was found that the spatial autocorrelation was increased when the aggregation level was being increased and decreased in a certainpoint. Another tendency was found that the scale effect of MAUP was decreased when the spatial autocorrelation was high.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.431-436
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• 2006

본 논문은 몰입형 가상환경 시스템에서 3 차원 공간입력 인터페이스 시스템을 이용한 3 차원 오브젝트 설계, 오브젝트의 변형 등의 작업을 수행하기 위해 몰입형 가상환경 시스템이 갖는 부정확한 입력과 접근성을 향상시키기 위한 연구이다. 몰입형 가상환경 시스템은 가상 디자인 분야에서의 활용이 예견되고 있으나, 사용자의 입력이 부정확한 단점으로 인하여 정밀한 입력을 요구하는 작업을 진행하기 위해 많은 어려움을 겪고 있다. 본 논문에서는 가상 디자인 분야에서의 사용자 입력 정밀도를 향상 시키는 방법으로 공간격자를 제시하고 두 가지 실험을 통해 공간격자를 사용할 때 사용하지 않았을 때 보다 좀 더 높은 입력 정밀도를 갖는 것을 알 수 있었다.

• Journal of Korean Association for Spatial Structures
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• v.2 no.4 s.6
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• pp.45-52
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• 2002

Research about spherical shells been applying most usually is achieved by many investigators already and generalized equation has been derived. But, existent research is limited in case that spherical shell's roof rigidity is isotropy or orthotropy, and research that consider periodicity of rigidity-distribution that can happen by doing spherical shell's roof system by lattice system is not gone entirely. The purpose of this paper is applying Galerkin method to spherical shell that model periodicity of roof rigidity distribution that appear by roof lattice form of large space structure and develop structural analysis program that formularize. Rigidity-model of this research selects that of spherical shell which has 2-way grid. In this paper, buckling-strength and deformation distribution of isotopic spherical shell and 2-way grid spherical shell obtained by developed program could confirm the reliability by comparison with result of existent research.

• Journal of Korean Association for Spatial Structures
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• v.16 no.4
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• pp.125-132
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• 2016

This paper is a study on the nonlinear behavior of polyhedron curved space roof as building structures of quasicrystal system. The quasicrystal is made up of two kinds of parallel hexahedrons, and all the line elements of the parallelepiped have the same length. The quasicrystal design grid dome has a pentagonal symmetry and all members have the same length. This paper described form of design gird dome, and showed the analysis conditions. Also, The displacement-load curve is shown through the analysis and we grasped the flow of the load and forces through analysis of design grid dome applied quasicrystal system.

• Journal of Korea Water Resources Association
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• v.33 no.S1
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• pp.20-27
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• 2000

The grid-based KIneMatic wave STOrm Runoff Model(Kim, 1998; Kim, et al., 1998) which predicts temporal variation and spatial distribution of saturated overland flow, subsurface flow and stream flow was evaluated at two watersheds. this model adopts the single overland flowpath algorithm and simulates surface and/or subsurface water depth at each cell by using water balance of hydrologic components. the model programmed by C-language uses ASCII-formatted map data supported by the irregular gridded map of the GRASS (Geographic Resources Analysis Support System) GIS and generates the spatial distribution maps of discharge, flow depth and soil moisture of the watershed.

• The Journal of Korea Robotics Society
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• v.9 no.2
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• pp.96-103
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• 2014

Global localization is one of the essential issues for mobile robot navigation. In this study, an indoor global localization method is proposed which uses a Kinect sensor and a monocular upward-looking camera. The proposed method generates an environment map which consists of a grid map, a ceiling feature map from the upward-looking camera, and a spatial feature map obtained from the Kinect sensor. The method selects robot pose candidates using the spatial feature map and updates sample poses by particle filter based on the grid map. Localization success is determined by calculating the matching error from the ceiling feature map. In various experiments, the proposed method achieved a position accuracy of 0.12m and a position update speed of 10.4s, which is robust enough for real-world applications.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.06a
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• pp.67-74
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• 2008

현재의 센서 네트워크 시스템은 공간적 정보를 배제한 센서 데이터스트림에 대한 저장 및 검색 방안에 대한 연구에 치중되어 있다. 하지만, 이러한 센서 네트워크가 공간적 정보와 결합하게 되면 훨씬 더 많은 응용과 의미 있는 데이터로 가공될 수 있다. 본 논문은 GeoSensor Network에서 공간적 정보와 데이터스트림이 결합된 공간 데이터스트림 정의 및 공간 데이터스트림간 조인 전략들과 그에 따른 조인 전략들 간의 비용을 추정하는 비용 모델을 제시하였다. 공간 데이터스트림간 조인 전략을 위해 Nested Loop 조인, Grid File, R-tree 알고리즘을 사용하였고, 단방향 Nested Loop 조인, 단방향 Grid 조인, 단방향 R-tree 조인 기법들을 조합하여 조인 전략들 간의 비용을 추정하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2000.05a
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• pp.20-27
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• 2000

The grid-based KlneMatic wave STOrm Runoff Modei (Kim, 1998; Kim, et al., 1998) which predicts temporal variation and spatial distribution of saturated overland flow, subsurface flow and stream flow was evaluated at two watersheds. This model adopts the single overland flowpath algorithm and simulates surface and/or subsurface water depth at each cell by using water balance of hydrologic components. The model programed by C-language uses ASCII-formatted map data supported by the irregular gridded map of the GRASS (Geographic Resources Analysis Support System) GIS and generates the spatial distribution maps of discharge, flow depth and soil moisture of the watershed.