• Proceedings of the KSRS Conference
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.631-633
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• 2003

Invisible networks have hidden bits flows from human being and become the periphery in the Internet overload; technologies become invisible and everywhere computing. The appearance of the calm environment requires a new relationship between human being and machines and geographic features: a paradigm shift. However no one says what next steps to those environments on details are, a reason why lots of people focus on the endeavors. In this paper, we touch the geographic features on ubiquitous environments and research the transition step of GIS mobile applications in order to achieve a natural integration of connectivity, capability and functionality.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (C)
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• pp.177-182
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• 2006

최근 무선 통신 구조가 확산대면서, 모바일 기기와 다양한 모바일 GIS 서비스가 일반화되었다. 그래서 모바일 기기에서 효과적으로 GIS 자료들을 검색할 수 있는 모바일용 GIS DBMS가 필요하다. 물론 모바일 GIS DBMS는 환경적 제약사항과 GIS 자료들의 특성들을 극복하기 위한 대량삽입 기법이 필요하며 이 기법은 모바일 GIS DBMS를 개발하는데 있어서 가장 중요하다. 이 제약사항은 낮은 대역폭, 작은 저장공간 그리고 비공간 데이터 보다 상대적으로 매우 큰 공간 데이터의 특징을 포함한다. OBO기법을 이용하는 GIS DBMS로의 데이터의 삽입은 차례대로 삽입된다. 그러나 대부분의 공간데이터들은 전송비용과 긴 로딩시간으로 인해 서비스를 지연시키기 때문에 공간 인덱스를 기반으로 하는 대량삽입을 선택한다. 본 논문에서는 높은 성능과 안전성을 가진 동적인 공간 인덱스 R*-tree을 이용하는 대량 삽입 기법을 제공한다.

• Journal of Fisheries and Marine Sciences Education
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• 제17권1호
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• pp.76-85
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• 2005

GIS (Geographic Information Systems) technology is a necessary function to support location based on service by using GPS in the mobile environment. These mobile systems have basic functional limitations such as a low rate of processing, limited memory capacity, and small screen size. Because of these limitations, most of the mobile systems require development of a reduced digital map to overcome problems with large-volume spatial data. In this paper, we suggest using the reduced digital map format in order to use location based on service in a PDA environment. The processing of the proposed data format consists of map generation, redefinition of layers, creating polygons, and format conversion. The proposed data format reduces the data size by about 98% comparing with DXF format based on the digital map of Busan.

• Journal of information and communication convergence engineering
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• 제7권1호
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• pp.41-45
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• 2009

In mobile GIS environments, a client needs to receive the isogram data with a topographical map from a server, if the mobile client wants to display map with elevation information. Because the elevation data size is normally quite large, the client will suffer some problems to receive the elevation data from server. The main reason is a resource limitation of the mobile devices. To overcome these problems, this paper proposes new data structures and algorithms. They are designed for efficient transmission of contour data to a client. Because of the contour data are generated as a vector style from elevation information stored at a server, the proposed algorithms are focused to minimize the transmission data volume and time.

• Journal of Korea Spatial Information System Society
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• 제6권1호
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• pp.73-85
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• 2004

Recently, as the growth of the wireless Internet, PDA and HPC, the focus of research and development related with GIS(Geographic Information System) has been changed to the Real-Time Mobile GIS to service LBS. To offer LBS efficiently, there must be the Real-Time GIS platform that can deal with dynamic status of moving objects and a location index which can deal with the characteristics of location data. Location data can use the same data type(e.g., point) of GIS, but the management of location data is very different. Therefore, in this paper, we studied the Real-Time Mobile GIS using the HBR-tree to manage mass of location data efficiently. The Real-Time Mobile GIS which is developed in this paper consists of the HBR-tree and the Real-Time GIS Platform HBR-tree. we proposed in this paper, is a combined index type of the R-tree and the spatial hash Although location data are updated frequently, update operations are done within the same hash table in the HBR-tree, so it costs less than other tree-based indexes Since the HBR-tree uses the same search mechanism of the R-tree, it is possible to search location data quickly. The Real-Time GIS platform consists of a Real-Time GIS engine that is extended from a main memory database system. a middleware which can transfer spatial, aspatial data to clients and receive location data from clients, and a mobile client which operates on the mobile devices. Especially, this paper described the performance evaluation conducted with practical tests if the HBR-tree and the Real-Time GIS engine respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.183-186
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• 2008

In ubiquitous GIS system, the spatial information could be updated and utilied by mobile terminals. Spatial information stored in mobile terminals should be able to synchronize to the server. However, in mobile environment, there are some limitations in synchronization service due to the limited bandwidth. The ActMAP system, that was developed to consider of mobile environment, has suggested a partial update protocal for synchronization in order to solve the narrow bandwidth problem. But it is still has a problem that it does not consider two-way synchronization between a server and a mobile terminal. This paper suggests a two-way synchronization protocol between a server and mobile terminals. It, therefore, is inclined to supporting updated and utilization of spatial information using mobile terminals.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.383-386
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• 2008

최근 모바일 장치에서 GIS를 활용한 다양한 서비스 시스템들이 연구 개발되어지고 있다. 하지만 모바일 장치는 하드웨어 구성의 차이와 운영체제에 따른 제공 라이브러리의 차이가 심하다. 그래서 대부분의 서비스 시스템이 특정 모바일 장치에 제한적으로 설계 구현되어지고 있다. 본 연구에서는 기존 모바일 GIS엔진에서 디자인 요소와 같이 특정 모바일 장치에 제한적일 수밖에 없는 부분을 제외한 모바일 GIS엔진을 설계하였다. 그리고 모바일 GIS엔진의 구현은 C++표준 라이브러리와 추가 사용자 라이브러리를 이용하여 구현함으로써 이종 모바일 장치에 호환성 있는 모바일 GIS 엔진을 구현하였다. 또한 문자 인코딩 방식을 UTF-16으로 통일함으로써 문자처리에 대해서도 호환성을 유지할 수 있도록 구현하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• 제8권6호
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• pp.49-54
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• 2008

Recently, with the development of wireless communications and GIS, interest about mobile computing is rising. In this case, the GIS needs to be placed in a constricted environment than the environment of server computing. For this reason large amounts of spatial data must be compressed into the mobile device. The compression technique of the spatial data is difficult and must be processed in the correct order because the size of the data is unpredictable. Therefore, in this paper, the cell-based compression technique of the spatial data for mobile GIS is presented. This paper includes the process of transformation of spatial data from a certain server to a mobile device by cell-based compression technique. In this paper, the cell-based compression technique of the spatial data has been proven practically efficient.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 한국측량학회 2010년 춘계학술발표회 논문집
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• pp.411-413
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• 2010

The purpose of this research is to study use method of mobile system for effective field management for urban facilities. GIS database could be standardized commonly useful for the site management of city facilities through standard list, standard items and standard specification appropriate for the mobile system, and this is effective to manage the city facilities on the site in real time.

• Proceedings of the Korea Contents Association Conference
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• 한국콘텐츠학회 2004년도 춘계 종합학술대회 논문집
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• pp.522-528
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• 2004

Mobile internet service based on CDMA network evolution and multifunction mobile terminal is popular in Korea. Mobile internet service is classified as the information service using browser and mobile multimedia service using download platform. Killer applications based on multifunction mobile terminals have been developed for new business in mobile internet services. One of killer applications is location based seurvice (LBS) using mobile location information. In this paper, we develop mobile map browser using WIPI platform that is the main function in LBS. Mobile map browser interworking with GIS server provides the map information. The developed mobile map browser can be working on PDA and telematics terminals when WIPI is porting on these devices.