• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.1003-1006
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• 2009

Recently, Ubiquitous computing technology is increasing necessity for object recognition and a location tracking technology to meet various applications. The location tracking technology is the fundamental to the Context-Aware of users in Ubiquitous environment and its efficiency has to be improved using IEEE 802.15.4 ZigBee used in current infra such as ubiquitous sensor network. But because the IEEE 802.15.4 ZigBee protocol has limitation to apply location tracking technology such as ToA and TDoA, Zone-based Location Tracking technology using RSSI is needed. In this paper suggests RSSI-based 802.15.4 ZigBee local positioning protocol to support a positioning tracking service in Ubiqutous environment. And Zone-based location tracking system is designed for actual the indoor location tracking service.

• Journal of Information Technology Services
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• v.10 no.4
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• pp.243-258
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• 2011

With increasing interest in ubiquitous computing technology, an infrastructure for the short-distance wireless communication has been extended socially, bringing spotlight to the security system using the image or location. In case of existing security system, there have been issues such as the occurrences of blind spots, difficulty in recognizing multiple objects and storing of the unspecified objects. In order to solve this issue, zone-based location-estimation search system for the image have been suggested as an alternative based on the real-time location determination technology combined with image. This paper intends to suggest the search service for the image zone-based location-estimation. For this, it proposed the location determination algorism using IEEE 802.15.4/ZigBee's RSSI and for real-time image service, the RTP/RTCP protocol was applied. In order to combine the location and image, at the event of the entry of the specified target, the record of the time for image and the time of occurrence of the event on a global time standard, it has devised a time stamp, applying XML based meta data formation method based on the media's feature data based in connection with the location based data for the events of the object. Using the proposed meta data, the service mode which can search for the image from the point in time when the entry of the specified target was proposed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.3B
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• pp.224-231
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• 2006

The location information of wired 112, 119 emergency call is provided immediately by subscriber database of KT. But emergency call made by mobile phone should be ask location information to mobile network. This paper proposes the network protocol for mobile emergency service refer to TIA/EIA/J-STD-036-A with reviews about technical issues, legacy factors and related researches. The mobile emergency service is divided to mobile emergency rescue service and mobile emergency alert service. The network reference model for mobile emergency rescue service is released in domestic sector. In this paper, the interfaces between modules of the network reference model, and service scenarios, message flows are defined. Supplement to mobile emergency rescue service, the network reference model, interfaces and message flows for mobile emergency alert service are developed.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.958-961
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• 2007

본 논문에서는 IETF ECRIT (Emergency Context Resolution with Internet Technologies) WG 에서 논의 중인 LoST (Location-to-Service Translation)를 기반으로 사용자의 현재 위치에서 적절한 서비스를 검색하여 정보를 전송하는 서비스 모델을 연구 및 구현하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.679-681
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• 2003

최근 인터넷과 무선통신의 발전으로 많은 외부 클라이언트들이 학교나 공공기관 같은 내부 네트워크를 사용하게 되었다. 이러한 클라이언트들은 내부 네트워크를 사용하게 되면서 여러 가지 서비스를 받기 위해 다양한 서비스의 위치정보를 검색하는데 사용되는 프로토콜인 SLP(Service Location Protocol)를 사용한다. 이 때 악의를 가진 클라이언트가 SLP(Service Location Protocol)를 이용해 서비스 리스트를 얻어 자신이 내부 네트워크의 모든 자원을 사용할 수 있게 만드는 것과 같은 악의적인 행동을 할 수 있는 문제점이 있다. 본 논문은 이러한 문제점을 해결하기 위해 PMI(Privilege Management Infrastructure)를 이용하여 내부 네트워크에 들어온 외부 클라이언트에 관해 내부 서비스에 대한 권한을 설정하고자 하는 방안을 제안하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.1B
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• pp.64-70
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• 2003

In order to provide seamless wireless Internet service, the basic mobile IP protocol should be enhanced to solve packet loss problem from large registration latency because frequent handoffs occur in cellular networks. In this paper, we suggest a new micro-mobility management protocol based on MPLS while supporting Qos, and evaluate its performance using simulation. We use MPLS label switching techniuqe in cellular access networks to simplify location management and speed up packet transmission. We adopt context transfer procedure to minimize the delay needed to attain prior level of service after handoff Packet loss can be minimized during handoff by transmitting received packets from old BSLER to new BSLER using a spliced LSP between them. Simulation results show that the proposed MPLS-based micro-mobility management protocol provides a seamless handoff and supports QoS of user traffic.

• The Transactions of the Korea Information Processing Society
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• v.6 no.8
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• pp.2133-2144
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• 1999

IMT-2000 system is expected to start its service at the beginning of 2000 on the purpose of providing with the highest qualitative service through one mobile terminal. In this paper, we investigate some of the important issues which need to be addresses in designing an authentication protocol for IMT-2000. Also proposed is an authentication protocol which addresses the above issues, and we design a correct and efficient authentication protocol to establish secure communication channel. Our protocol provides an authentication of the communication entities, location privacy, and secure messaging as well as global roaming service.

• Journal of Korea Spatial Information System Society
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• v.7 no.2 s.14
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• pp.3-14
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• 2005

The purpose of this study is to present the role of NGIS(National Geographic Information System) and the development strategy for Business GIS in the ubiquitous society. We analyze the level of GIS technology with the ICT(Information Communication Technology) as well as GIS application trends especially in location-based circumstances. Also, we advocate not only making GIS contents to meet the international standards such as GML(Geography Markup Language) and TPEG(Transport Protocol Experts Group) but applying GIS as a killer application to oncoming diverse ICT areas including LBS(Location -Based Service), Telematics, ITS(Intelligent Transport System), gCRM(geographic Customer Relationship Management), DMB(Digital Multimedia Broadcasting), u(ubiquitous)-City and u-Town. Finally, we build a conceptual Business GIS model based on NGIS for QoS, standardization, R&D, education, and security.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.6
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• pp.566-573
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• 2004

This paper describes the ubiquitous home network (uHome-net) testbed and LonRF intelligent devices based on LonWorks technology. These devices consist of Neuron Chip, RF transceiver, sensor, and other peripheral components. Using LonRF devices, a home control network can be simplified and most devices can be operated on LonWorks control network. Also, Indoor Positioning System (IPS) that can serve various location based services was implemented in uHome-net. Smart Badge of IPS, that is a special LonRF device, can measure the 3D location of objects in the indoor environment. In the uHome-net testbed, remote control service, cooking help service, wireless remote metering service, baby monitoring service and security ＆ fire prevention service were realized. This research shows the vision of the ubiquitous home network that will be emerged in the near future.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.6C
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• pp.578-587
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• 2009

In 2005, Ko-Kim-Kwon pointed out Henrici-Muller's hash based RFID authentication protocol is insecure to location tracking attack, spoofing attack and Denial of Service attack. Then, they proposed a new RFID authentication protocol(3K-RFID) that can withstand these security problems. However, this paper shows that 3K-RFID authentication protocol is still not only vulnerable to spoofing attack and Denial of Service attack but also does not provide forward secrecy, and then proposes an improved secure I3K-RFID authentication protocol in order to resolve such problems.