• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.608-611
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• 2005

The existing wired emergency call such as 119, 112 have its own location information to serving immediate rescue service. For the case of wireless emergency call by mobile phone, the location information should be provided by wireless network. This paper describes the network architecture and protocol for mobile emergency service referring TIAlEWJ-SID-036-A with reviews about technical issues, legacy factors and related researches. The mobile emergency service is divided into mobile emergency rescue service and mobile emergency alert service. The network reference model for mobile emergency rescue service is released in KOREA. In this paper, the interfaces between elements 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. The protocol is described by DID, and the proposed works are on processing for domestic standard of TTA.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.357-360
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• 2007

An asset tracking using wireless sensor network is concerned with geographical locations of sensor nodes. The limited size of sensor nodes makes them attractable for tracking service, at the same time their size causes power restrictions, limited computation power, and storage restrictions. Due to such constrained capabilities, the wireless sensor network basically assumes the failure of sensor nodes. This causes a set of concerns in designing asset tracking system on wireless sensor network and one of the most critical factors is location uncertainty of sensor nodes. In this paper, we classify the location uncertainty problem in asset tracking system into following cases. First, sensor node isn't read at all because of sensor node failure, leading to misunderstanding that asset is not present. Second, incorrect location is read due to interference of RSSI, providing unreliable location of asset. We implemented and installed our asset tracking system in a real environment and continuously monitored the status of asset and measured error rate of location of sensor nodes. We present experimental results that demonstrate the location uncertainty problem in asset tracking system using wireless sensor network.

• 한국ITS학회 논문지
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• 제3권1호
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• pp.67-74
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• 2004

차량과 무선 액세스망과의 연동을 통한 새롭고 다양한 멀티미디어 서비스를 제공할 수 있는 차세대 텔레매틱스 기술이 새로운 유망산업으로 소개되고 있다. 초기의 텔레매틱스 기술은 단순히 차량내에서 전자제어장치간의 제어, 모니터링, 내비게이션 등이 주였지만, 최근에는 외부의 무선 액세스망과의 연결을 통하여 모바일 인터넷 서비스, 위치정보 서비스, 긴급구조 서비스, 멀티미디어 서비스 등을 제공하고 있다. 본 논문에서는 이러한 서비스의 활성화와 효율성을 제공하기 위하여 차량내 텔레매틱스 모바일 플랫폼 구조를 제안한다.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.85-90
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• 2005

The advance of mobile and telematics technologies has produced vehicles with various convenient services for drivers. Specifically lots of researches and several technologies have been developed to provide services of a remote vehicle diagnosis and control. The existing and representative product for a vehicle control is a RCS (remote control system), but it has a problem of short control distance and fragile security. In this paper, a telematics terminal embedded with CDMA and GPS is designed, which can be connected to the Internet. It allows a driver with a cellular phone to remotely diagnosis and control a vehicle via wireless network and SMS.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.105-108
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• 2003

In the next generation backbone networks based on dense-wavelength division multiplexing (DWDM), the routing and wavelength assignment with quality-of-service (QoS) recovery is essentially needed to support a wide range of communication-intensive and real-time multimedia services. This paper proposes a new dpmic routing method called as MW-MIPR (MultiWavelength-Minimum Interference Path Routing), which chooses a route that does not interfere too much with many potential future connection requests. This paper also proposes a differentiated RWA mechanisms combined with MW-MIPR algorithm to provide QoS recovery for various multimedia applications in the next generation backbone networks based on DWDM.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 하계종합학술발표회논문초록집
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• pp.117-117
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• 2004

• 한국인터넷방송통신학회논문지
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• 제9권6호
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• pp.125-134
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• 2009

유비쿼터스는 사용자들이 시간과 장소에 구애받지 않고 자유롭게 네트워크에서 서비스를 제공받아야 한다. 그 중에 대표적인 응용 서비스로는 텔레매틱스가 있다. 텔레매틱스 서비스는 시간과 장소에 따라 개인화된 서비스를 제공해 주어야 한다. 또한, 텔레매틱스 서비스를 이용하는 사용자는 서비스를 요청하지 않아도 이용할 수 있는 서비스를 자동으로 제공 받아야 한다. 따라서 본 논문에서는 사용자 모바일 단말기인 PDA를 통해 UPnP를 이용하여 텔레매틱스 환경에서 서비스 발견 방식을 설계 구현 하고자 한다. PDA는 텔레매틱스 서비스 지점의 로컬 서버와 블루투스 통신으로 연결하였으며, UPnP를 이용하여 로컬 서버와 연결된 UPnP 디바이스와 서비스를 발견하여 이용하게 된다. 텔레매틱스 환경에서 사용자에게 서비스를 제공하는 UPnP 디바이스를 설계한다. 서비스 발견을 테스트하기 위해 텔레매틱스 서비스 테스트베드를 구축한다. 구축된 시스템은 블루투스 통신 기반에 UPnP를 적용하여 서비스 발견시스템을 구현 및 테스트 하였다.

• 한국산업정보학회논문지
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• 제19권3호
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• pp.9-15
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• 2014

In the ubiquitous computing environment, a ubiquitous vehicle will be a communication node in the vehicular network as well as the means of ground transportation. It will make humans and vehicles seamlessly and remotely connected. Especially, one of the prominent services in the ubiquitous vehicle is the vehicle remote operation. However, mutual-collaboration with the in-vehicle communication network, the vehicle-to-vehicle communication network and the vehicle-to-roadside communication network is required to provide vehicle remote operation services. In this paper, an Internet-based human-vehicle interfaces and a network architecture is presented to provide remote vehicle control and diagnosis services. The performance of the proposed system is evaluated through a design and implementation in terms of the round trip time taken to get a vehicle remote operation service.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.749-752
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• 2005

In this paper, we introduce an Intersection Collision Avoidance (ICA) system as a convergence example of Telematics and USN technology and show several requirements for the ICA system. Also, we propose a system design that satisfies the requirements of reliable vehicular data acquisition, real-time data transmission, and effective intersection collision prediction. The ICA system consists of vehicles, sensor nodes and a base station that can provide drivers with a reliable ICA service. Then, we propose several technological solutions needed when implementing the ICA system. Those are about sensor nodes deployment, vehicular information transmission, vehicular location data acquisition, and intersection collision prediction methods. We expect this system will be a good case study applied to real Telematics application based on USN technology.

• ETRI Journal
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• 제28권3호
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• pp.383-385
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• 2006

A new meander-line antenna consisting of two open-ended strips is proposed for a compact and broadband UHF radio frequency identification tag. An equivalent circuit model for the proposed antenna is derived and used to perform a simple and wideband impedance match to an arbitrary complex impedance of a tag chip without any additional matching network. The performance of the proposed antenna is validated by comparing calculated and measured results, which show good agreement.