• Journal of KIISE:Computing Practices and Letters
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• v.12 no.1
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• pp.9-20
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• 2006

Web Map Service on mobile environment, provided with cost effective mobile GIS contents and user preferred POIs(Points of interests), is strongly required at this moment when mobile and portable Internet is rapidly spreaded on mobile user community as information technology and mobile HW are evolved in its speed, bandwidth and features. As the mobile and portable Internet becomes popular in mobile services, LBS(Location Based Service) is positioned on a mobile client as one of the best information infra services. Recently mobile GIS (Geographic Information System) comes in service to support LBS, but it is constrained and limited on its system configuration and its presentation methodology of a map, and also it depends on its run time environment. In this paper, we made an effort to design and implement a GIS computing platform with server based thin client for mobile WMS(Web Map Service). For its cost effective Platform which could be easily building up POIs and GIS contents, we're not using commercial GIS solution but NGII's (National Geographic Information Institute's) DXF numerical map, and representing the maps, GIS contents and POIs by SVG(Scalable Vector Graphics) recommended by OGC(OpenGis Consortium). We're also adapting de facto standard of XML web service technology such as WSDL, SOAP to provide real time mobile GIS service on PDA as well as mobile terminal by applying a GPS receiver for a user's location information on mobile environment.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.843-846
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• 2004

최근 차세대 이동통신서비스로 부각되고 있는 위치기반서비스 응용의 핵심기술로 Mobile GIS 서비스에 대한 관심이 증가하고 있으며, 처리능력, 저장공간, 디스플레이, 데이터통신 환경에서 제한적인 환경을 가진 이동 컴퓨팅 환경에서 지리정보를 효율적으로 처리하기 위한 Mobile GIS 서비스 모델에 관한 연구 및 개발이 이루어지고 있다. 본 논문에서는 이러한 이동 컴퓨팅 환경의 제한된 환경에서 효율적인 Mobile GIS 서비스를 제공하기 위한 방법으로 지리정보 좌표의 바이너리화와 Base-Offset 구조를 사용하는 초경량 수치지도 모델을 제안한다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2004.03a
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• pp.147-166
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• 2004

최근 정보기술의 동향을 살펴보면 공통적인 키워드를 발견할 수 있는데, 그것은 바로 모바일(Mobile)이다. 이에 GIS 분야에서도 무선환경에서의 GIS 활용을 위한 기술이 확산되고 있으며, 대표적인 기술로 LBS(Location Based Service)와 모바일 GIS(Mobile GIS)가 있다. 이러한 배경하에 선진국가에서는 고도화된 전자정부 구현을 위해 무선 GIS 기술적용이 추진되고 있으며, 국내에서도 모바일 전자정부 추진계획이 수립되었다. 이에 본 논문에서는 공공분야에서 효율적인 무선 GIS 기술도입을 위해 공공분야의 무선 GIS라는 개념을 제시하고, 무선 GIS 서비스 구현의 기반이 되는 서비스 유형을 제시하였다. 공공분야의 무선 GIS 서비스 유형은 LBS와 모바일 GIS를 기반으로 적용 가능한 업무유형과 무선 GIS 특성에 따른 서비스 구조로 구분하여 고찰하였으며, 두 내용을 종합하여 공공분야의 무선 GIS 서비스유형을 제시하였다. 제시된 무선 GTS 서비스 유형은 향후 모바일 전자정부 및 공공분야에서의 모바일 관련 GIS 서비스 구현시 참조할 수 있을 것이라 예상된다.

• Journal of the Korea Society of Computer and Information
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• v.7 no.4
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• pp.16-23
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• 2002

Recently, as the result of high technology of computer environments. various types of computer applications have been researched and developed. Ana, because of the growth of the mobile device such as PDA, HPC, and location tracking technology such as GPS, various services that is based on personal locations are provided. For these Mobile GIS, there is needed a development of client for Mobile GIS that is considered about the characteristics of mobile device. So, we design and implement client interface for Mobile GIS in this paper.

• Journal of the Korean Geographical Society
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• v.46 no.6
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• pp.738-750
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• 2011

Partly due to the climate changes, flooding occurs more often than before. Particularly high urbanization causes more damages by flooding with unexpected downpours. Recent mobile telecommunication technology can help to reduce the damage by a natural disaster with quick alarming process. This research aimed to implement a flood warning GIS service system based on open source software and mobile hybrid application program with LBS. The developed system utilized location information of mobile clients for smart phone users to get alerted to flooding immediately. This service system would be very useful in urban areas to reduce the flood damages.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.81-84
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• 2001

PC 환경이 아닌 무선 인터넷 환경에서 제공되는 Mobile GIS(Geographic Information System)는 시간과 공간의 제약을 극복하고 실시간으로 지리정보를 얻을 수 있는 장점을 가지고 있으나, 사용자의 무선단말기와 서버 사이에 접속이 유지되어 있어야만 무선으로 GIS 서비스를 이용할 수 있다. 이는 현재 국내 무선 네트워크의 느린 속도와 비싼 이용 요금을 감안하면 Mobile GIS 가 대중화되는데 장애요인이 되고있다. 그리고 무선 인터넷 서비스가 급격히 증가하면서 Mobile GIS는 보안상 약점을 드러낼 것으로 예측된다. 그러므로 본 논문에서는 공개된 불특정다수의 무선 네트워크 환경에서 발생할 수 있는 보안의 피해와 그에 따른 기본적 Mobile Security 서비스에 대해 알아보고, 정보보호 입장에서 Mobile Database 를 연구하였다. 또한 Mobile GIS 를 위한 WAP 게이트웨이에서 공간데이터의 유출 가능성을 발견하였고, 이를 위한 해결책으로 J2ME 의 Pre-verification 기능과 종단간 암호화 (End-to-End Security) 기능을 Mobile GIS 설계에 적용하여 무선 환경에서 동적인 지도서비스와 더불어 공간 데이터의 보안을 유지할 수 있는 기법을 제시하였다. 이 연구를 통해 대역폭(Bandwidth)의 한계를 지닌 개방적 무선환경에서 Mobile GIS와 같은 컨텐츠 프라이버시(Contents Privacy) 보호가 요구되는 분야에 응용될 수 있으리라 기대된다.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.307-309
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• 2003

The paper compares Static GIS, Mobile GIS, Dynamic GIS and Moving GIS at first, then puts forward and discusses a description means of mobile objects, a model of spatial relation based on 9-intersection model and the query and analysis operations that Moving GIS should implement. On the above theory basis, the paper designs the function of Moving GIS and implements a prototype system named PNS-I on the basis of PDA, which has integrated GPS, GIS, GSM and GPRS.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.753-758
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• 2005

This study attempts at building an integrated GIS computing framework for evaluating space-time accessibility of an individual with the approach of time geography model. The proposed method is based on the integration of mobile GIS and object-relational spatio-temporal database. Three components are central to our system: ( i ) mobile GIS application that transmits spatio-temporal trajectory data of an individual; ( ii ) spatio-temporal database server that incorporates the time geography model; and (iii) geovisualization client that provides time geographic queries to the spatio-temporal database. As for the mobile GIS application, spatio-temporal trajectory data collected by GPS-PDA client is automatically transmitted to the database server through mobile data management middleware. The spatio-temporal database server implemented by extending a generic DBMS provides spatio-temporal objects, functions and query languages. The geovisualization client illustrates 3D visual results of the queries about space-time path. space-time prism and space-time accessibility. This study shows a method of integrating mobile GIS and DBMS for time geography application, and presents an appropriate spatio-temporal data model for evaluating space-time accessibility of an individual.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.1
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• pp.150-157
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• 2004

For the mobile GIS services, it is not acceptable to construct a new map database only for wireless service due to vast cost. But the existing map database cannot be used directly for the services due to narrow wireless bandwidth and shortage of mobile device resources. This thesis proposes spatial data simplification methods, thus, the existing map database enable the mobile GIS services. The proposing methods are based on the existing map generalization techniques. We extend it to mobile environments, and implement. This thesis also includes the issue of discriminative data simplification technique according to display level and map display interface suitable for mobile devices. Research results an estimated by experiments.

• Journal of Korea Spatial Information System Society
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• v.2 no.2 s.4
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• pp.25-37
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• 2000

As computer systems of high capacity and high performance recently emerged, various researches about GISs(Geographic Information Systems) have been in progress and many GIS applications have also been developed. From the domestic situation where many people are using mobile devices, because of the recent advances in the mobile technology, we can infer that the time will come when every individual will carry a mobile device with a GPS(Global Positioning System) module resulting from the development of a miniature GPS Module. Therefore, a mobile GIS that can allows users to deal with dynamic GIS data management and perform their tasks while moving will be required. This paper discusses the design and implementation of a mobile GIS using the shareware DBMS, called postgresSQL. The Mobile GIS in which a mobile concept is utilized at the GIS data server makes it possible to insert, delete, update GIS data, to zoom in and zoom out displayed maps, and to locate the user's position on the client device. Therefore, It is possible to manage dynamic GIS data in order to deal with GIS data on the maps while moving, connect various GIS data servers through the middleware, and connected with ITS (Intelligent Transport System) which is one of applications of the Mobile GIS developed in this paper.