• Journal of the Korean Association of Geographic Information Studies
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• v.9 no.2
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• pp.30-41
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• 2006

This paper proposes an e-logistics system supporting efficient vehicle moving trajectory management. Recent advances in wireless communications have given rise to a number of location-based services including logistics vehicle tracking, cellular phone user's location finding, and location-based commerce. Logistics systems typically entail tracking vehicles for purposes of the logistics center knowing the whereabouts of the vehicles and/or consignments. Moreover, storing and managing location trajectory of continuously moving vehicles and consignments is necessary for supporting efficient logistics plan and consignment. The proposed system is able to manage spatial objects in GIS as well as logistic information in the mobile environment. And for the efficiently managing and retrieving of transporting trajectory of logistics, we extend previous moving object indexing method, TB-Tree, to use multi-version framework and evaluate data updating performance. It is able to apply the proposed method to develop mobile contents services based on continuously changing location of moving object in the mobile environment.

• Journal of Internet Computing and Services
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• v.6 no.5
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• pp.97-110
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• 2005

Recently, many WMS(Web Map Services) and POI(Point of Interest) services come to be in service on the Internet using Web GIS(Geographic Information System) as Information Technology and computer H/W are evolved faster in its speed, network bandwidth and features. The Web GIS is, however, limited and constrained on the specification of its system configuration, the service class provided and the presentation methodology of a map. As the mobile Internet becomes popular in mobile service, Web GIS service on mobile environment is strongly required and to be provided by location based WMS(Web Map Service) on a mobile client such as PDA with location information of the user. In this paper, we made an effort to design and implement a GIS computing environment by thin client for mobile web map service. For implementing the thin client GIS computing environment. we were using NGII's(National Geographic Information Institute's) DXF map, representing the map by SVG(Scalable Vector Graphics) recommended by OGC(OpenGis Consortium), and adapting standard XML web service to provide the thin client GIS service on PDA by applying the location information of the user in realtime with GPS on mobile environment.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.195-196
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• 2015

최근 들어 웹기반 GIS 시스템에 대한 요구가 늘어나고 있다. 이를 만족시키기 위해 관련 시스템 개발에 대한 연구가 많이 진행되고 있다. 그러나 웹 기반이라는 제약 때문에 대용량 데이터를 이용한 GIS 표출은 한계에 다다르고 있다. 본 논문에서는 위치 정보를 압축하여 웹기반 GIS 시스템의 제약을 줄일 수 있는 알고리즘을 제안하려 한다. 제시된 기법은 웹기반 GIS 시스템은 물론 다양한 모바일 및 웹 그래픽스 분야에 응용될 것으로 예상된다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.97-99
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• 2001

최근 웹 기반 혹은 모바일 기반의 지리정보시스템과, 높은 품질의 공간데이터에 대한 요구가 증대하고 있다. 이를 해결하기 위해서는 레벨별 상세화를 지원하는 데이터가 제공되어야 하며, 이러만 데이터를 효율적으로 처리하는 공간 인덱싱이 필요하다. 그러나, 레벨별 상세화 데이터를 지원하는 공간 인데싱 기법에 대한 기존 연구는 일부 일반화 연산자만을 지원하고 레벨별 데이터간 일관성을 고려하지 않는다는 문제점을 가진다. 본 연구에서는 이러한 문제를 극복하고자 일관성이 보장되는 맵 일반화 연산자를 모두 지원하는 공간 인덱싱 기법을 제안한다. 이를 통해 레벨별 상세화를 지원하는 데이터가 보다 효과적으로 다루어질 수 있다는 의의를 가진다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.301-303
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• 2005

최근 자동차에서 위치$\cdot$지리정보를 제공하는 CNS(Car Navigation System)분야로 많은 개발이 되고 있으며, 이를 휴대용 단말기에 적용해 개인화하여 서비스를 제공하고 있는 추세이다. 휴대 단말기에 적용해 개인화 서비스를 제공하는 것을 PNS(Personal Navigation System)라 하며, 이 시스템은 이동 중인 사용자가 휴대용 기기에 공간 데이터를 저장하고 사용자의 위치를 기반으로 목적지까지의 경로를 안내하는 서비스 유형으로 사용자가 휴대하는 기기에 의해 정보가 제공되기 때문에 개인화 정보 제공이라는 특징을 가지고 있다. 또한 위치기반 PNS 서비스는 단순 위치 정보의 활용만이 아니라 위치 정보를 근간으로 POI(Poin of Interest)가 제공되어야 한다. 이를 위해서는 위치에 부가되는 다양한 POI의 정보와 함께 개인의 성향 정보가 적용되어야 한다. 그러나 아직까지 개인의 성향이나 특성에 따른 정보를 포함하지 않고 있다. 본 논문에서는 사용자가 선 입력한 성향정보와 History 정보로부터 추출되는 사용자 선호 특성 정보를 데이터베이스로 구축하고, 개인 선호 특성 정보를 반영하여 웹 또는 모바일 기기를 통해 POI 서비스를 제공 받을 수 있는 PNS시스템을 제안하였다.

• Journal of KIISE:Information Networking
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• v.35 no.3
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• pp.227-234
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• 2008

The development of wireless network technology allows high data rate seamless communication irrespective of the place and time in various emerging mobile service environment. Unlike wired networks, however, wireless networks utilize expensive limited bandwidth. MBS(Multicast Broadcast Service), which is supported by mobile WiMAX system based on IEEE802.16e, overcomes this problem using a shared downlink channel for efficiently supporting a number of users. However. the coverage and throughput of the system are significantly affected by the channel condition. In this paper we propose on MBS system employing Mobile Multi-Hop Relay(MMR) and adaptive modulation and coding(AMC) scheme. The result of NS-2 computer simulation shows that the throughput and transmission time are substantially improved by the proposed approach compared to the existing MBS system.

• Journal of the Korean Association of Geographic Information Studies
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• v.16 no.4
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• pp.141-152
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• 2013

The applications and concerned technologies of cloud computing services, one of major trends in the information communication technology, are widely progressing and advancing. OpenStack, one of open source cloud computing platforms, is comprised of several service components; using these, it can be possible to build public or private cloud computing service for a given target application. In this study, a remote sensing image analysis processing service on cloud computing environment has designed and implemented as an operational test application in the private cloud computing environment based on OpenStack. The implemented service is divided into instance server, web service, and mobile app. A instance server provides remote sensing image processing and database functions, and the web service works for storage and management of remote sensing image from user sides. The mobile app provides functions for remote sensing images visualization and some requests.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.2 s.32
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• pp.51-63
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• 2005

With the emerging mobile technologies, applications based on GIS are also getting more attention recently. But it is known to have some limitations in being served in different types of mobile devices and platforms. While information services are limited by data format and data exchange between platforms, the eXtensible Markup Language(XML) is getting focused as the most promising technology as the solution to such problems. Geographic Markup Language(GML) is based on XML technology and is being frequently mentioned recently as the solution to service problem on different mobile devices as well as the internet. In this study, we suggested the framework to use the GML in order to transfer and represent geographical data through the on-line or wireless platforms. We compared different application types which are currently used with GML and proposed to improve GIS services using the GML in geographical data transfer and description.

• Journal of the Korean Association of Geographic Information Studies
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• v.9 no.2
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• pp.91-101
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• 2006

Recently, as a part of NGIS project, cultural-assets digital map is produced by cultural properties administration and local autonomous entities. Cultural-assets unified GIS(Geographic Information System) is essential to cultural properties managers and other organizations which are executing land related business for appling it at planning stage. With explosive national land developments, it has been obligated to implement surface survey by the cultural properties protection Art. In this paper, we develope a MSSS(Mobile Surface Survey System) and central GIS management system using CDMA wireless network, real time DGPS and C/S GIS technologies. And we suggest a construction-plan of cultural-assets digital map drawing and managing system by Archaeologist using developed system by this study.

• 한국공간정보시스템학회:학술대회논문집
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• 2004.12a
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• pp.20-29
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• 2004

언제 어디서나 사람 또는 사물과 같은 객체의 위치를 인식하고 이를 기반으로 하는 다양한 서비스를 제공하는 유비쿼터스 환경에서는 위치정보가 매우 중요한 역할을 한다. 기존의 연구에서 모바일 지리정보 시스템을 유비쿼터스 환경으로 확장시킬 경우 이동 단말의 수가 증가함에 따라 서버로 부하가 집중되는 문제가 발생한다. 이에 본 논문에서는 서버/ 클라이언트 모델과 피어 투 피어 모델을 함께 사용하는 혼합모델을 제시하고, 그에 적합한 시스템 구조를 제안한다. 또한, 제시한 시스템을 실제 응용분야에 적용한 결과를 제시한다.