• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.588-591
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• 2009

In ubiquitous computing GIS services, it is possible to use the spatio-temporal data anytime through the mobile device. GIS services regularly update use the latest spatio-temporal data to provide the most suitable services. For this situation, update data is distributed to CD or wired networks update services. However, this method has problem to propagate update data to users as taking long time. In this paper, suggests a synchronization system which propagate update data to users for reducing processing time efficiently. This synchronization system collects update data in the field and synchronizes server with collected data to use mobile devices by real time. For this system, I design and materialize synchronization module which updates update data and wireless network module.

• Journal of Korea Spatial Information System Society
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• v.11 no.1
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• pp.35-42
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• 2009

This paper proposes a new GeoPhoto contents markup language that can create u-GIS contents by using the spatial photos. GeoPhoto contents markup language has designed the GeoPhoto contents model and markup language for contents that can be used the spatial photos information. GeoPhoto con tents markup language is represented by the convergence of GIS information, location information, photos information respectively. GeoPhoto contents markup language to provide a variety of pictures related to the content model consists of GeoPhoto contents model and operations between the GeoPhoto contents. GeoPh oto contents model supports GeoPhoto model, CubicPhoto model, Photo model and SequenceGeoPhoto mod el. In addition, this paper propose the Annotation operation, Enlargement operation and Overlay operation for represent the GeoPhoto contents. GeoPhoto Contents Markup Language has the advantage of supportin g user custom contents model of u-GIS.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.2
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• pp.81-91
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• 2012

As the recent development of the ubiquitous computing environment, u-GIS is being highlighted as the core technology of the ubiquitous computing environment, and thereby, studies on spatio-temporal data are being actively conducted. In this u-GIS environment, it is still difficult for existing mobile devices to efficiently manage the massive spatio-temporal data of u-GIS that are increasing day by day. Therefore, this paper develops a spatio-temporal query processing system for mobile devices in order to solve the problem. The system provides various spatio-temporal operators to insert/delete/update/search spatio-temporal data and supports a query optimization function that uses a spatio-temporal index for the flash memory and a spatio-temporal histogram for guaranteeing query execution speed. Lastly, by applying the spatio-temporal query processing system developed in this paper to the virtual scenario, this paper has proved that the system can be utilized in various application fields necessary to process spatio-temporal data in the mobile environment.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.148-151
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• 2009

u-GIS 공간정보를 제공하기 위한 3D 모델의 렌더링 성능을 향상시키기 위해 일반적으로 Discrete LOD 기법이 적용된다. 하지만 u-GIS의 3D 건물 모델은 그 복잡성이 매우 높아 LOD 단계별로 모델을 직접 생성하려면 많은 비용과 시간이 소요되어 효율적이지 못하다. 본 연구에서는 원본 3D 모델을 활용하여 하위 LOD 단계의 모델을 메쉬 간략화 알고리즘인 QEM 기법을 통해 생성하는 프로그램을 구현하였다. 프로그램은 다양한 3D 모델의 데이터 포맷을 입력받고 출력할 수 있도록 하여 범용성을 높이고, 생성되는 모델의 결과를 바로 화면으로 확인할 수 있도록 하여 사용자 편의성을 확보하였다. 몇 개의 실제 3D 건물 모델로 실험을 수행하여 프로그램의 성능을 검증하고 그 결과를 도출하였다.

• Journal of Korea Spatial Information System Society
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• v.11 no.1
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• pp.87-96
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• 2009

In u-GIS environments, a geographic information service system for mobile phone is consumer(user) oriented service system based on existing GIS and LBS considering characteristic of mobile phone. In the past, development of a geographic information service system for mobile phone dependent on various hardware specification of mobile phones and mobile operators. From now on, the geographic information service system for mobile phone independents on hardware specification of mobile phones and mobile operators. Also, it changes from service oriented GIS provider(specialist) to service oriented consumer. For the satisfaction of this requirement, we propose a design of geographic information service system for mobile phone using FLEX for creates standard execution file. The standard execution file is able to apply various mobile phone. And we propose a management method of picture contents combination of location information that geographic information service system for mobile phone is provided it firstly. In this system, it provides facilities that display map, manage location, manage contents, manage mash-up, manage map data. And then it provide facility of swf generation for display result map on mobile phone. In this paper, we are implemented the proposed system and seen same results in various mobile phone. The created *.swf file provides same result at any time, anywhere, anyone in spite of different zoom level and different display screen.

• Proceedings of the KGS Conference
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• 2006.06a
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• pp.11-13
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• 2006

• Journal of Korea Spatial Information System Society
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• v.11 no.1
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• pp.25-34
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• 2009

As the trend of the Web is changing toward 'Web 2.0', OpenAPIs, Web 2.0's core technology, are used in many web sites. In the past, services in websites are used in its own, but recently it is possible to use services in other websites by using OpenAPI. In u-GIS many vendors also can provide combined service by using OpenAPI. There are already lots of OpenAPIs and the numer of OpenAPI increases very fast. So it is difficult to find a service that we want to use, and also difficult to find services for mashup. In this paper, we developed retrieval methods for OpenAPIs and mashup capable services based on similarity. First we define the integrated service information model to cover various protocols of OpenAPI, then developed a retrieval methods based on it. By implementing system according these methods by using relational database and JSP, we prove that the system can provide an ranked result sets based on similarity, OpenAPI's integration retrieval results and mashup capable service retrieval results.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.97-100
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• 2005

3차원 공간정보는 u-Korea, 전자정부, 유비쿼터스, LBS등의 기반 인프라 및 3차원 그래픽 처리기술, 가상현실 기술 등의 종합적으로 적용되는 고부가가치 통합 기술로 필요성이 부각되고 있다. 본 연구에서는 컴퓨터 그래픽스 분야에서 많이 적용되고 있는 공개 그래픽 라이브러리인 OpenGL(Open Graphics Library) 기반의 3D-GIS 가시화 어플리케이션 아키텍쳐를 중심으로 렌더링 기법을 분석하고자 한다. 한편 본 연구의 실험은 Visual Studio.NET환경에서 3D-GIS 모델 Prototype을 구현하여 수행하였으며 향후 실시간 모바일 3D-GIS 렌더링을 위한 기반 기술로 적용될 수 있는 OpcnGL-ES의 확장 가능성을 검토하고자 하였다.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1843-1845
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• 2000

GIS(Gas insulated switchgear)내부에서 발생한 부분방전 신호를 검출 할 수 있는 UHF(Ultra-high frequency) 부분방전 검출 센서를 345 kV GIS의 AC 내전압 시험에 적용하였다. 부분방전 센서를 적용한 상태에서 각 상별로, bus별로 나누어 계통 최고전압의 1.0 p.u, 1.5 p.u, 1.73 p.u 전압을 단계적으로 인가하였으며 간헐적으로 부분방전 신호가 검출됨을 확인하였다. 간헐적인 부분방전 신호는 GIS 내부에 있던 이물질에서 약한 방전이 시작되고 인가전압을 높임에 따라 방전의 강도가 증가하다 소멸되었다. 방전을 일으킨 이물질이 모두 증발되었거나 위치 변화에 의해 방전이 소멸된 것으로 판단된다.

• Journal of Korean Society for Geospatial Information Science
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• v.16 no.2
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• pp.3-8
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• 2008

Informatization today has been developed in a ubiquitous environment unifying real and virtual space from digital space. To reflect on this trend, the government has promoted the u-Korea Project, which is a national strategy based on ubiquitous technology. With this national informatization policy, 'The Creation of the Infrastructure for Realization of Ubiquitous Country' for establishing a ubiquitous world is presented in the 3rd National Geographic Information System (NGIS) Master Plan, which manages national spatial information. However, we have not yet discovered distinct change for ubiquitous environments and practical technologies. The purpose of the study is to explain the current status of Ubiquitous policies and National GIS policies as a representative national information strategies directed toward the ubiquitous society by comparing Korea and Japan, and then develops improved strategies for the future.