• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.1A
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• pp.67-73
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• 2008

Our research is aimed at developing an architectural frame-work of USN sensor network discovery service systems. The research is fo-cused on the four areas a survey of USN technology, development of a USN software model, development of the design space of the USN sensor network discovery service, and finally the architectural framework of the USN sensor network dicovery service. The survey of the USN technology is conducted on four technological visions that contain USN system technology, USN networking technology, and USN middleware along with the service platform, With respect to each technological division, domestic and worldwide leading research projects are primarily explored with their technical features and research projects are primarily explored with their technical features and research output To provide a means to analyze sensor network discovery services, we devel-oped the design space of the sensor network discovery services by exploring the scalability with respect to query scope, lookup performance, and resolution network.

• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.147-156
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• 2010

There are some of the studies on sensor middleware. However the standard middleware has not yet been defined. Especially, this paper focuses on the processing an intelligent service of the main functions of middleware. Several applications in the sensor network environment support not only monitoring services, but also sensor-based context-awareness and intelligent services based on sensors. However, the previous studies about USN middleware only mentioned the need for intelligent service and did not discuss the architecture and method for supporting the intelligent service in detail. Therefore this paper designs a USN middleware for providing intelligent services and proposes the method for processing the services. For this purpose, this paper proposes the Sensor-Service ontology to define the concept of services and sensors for USN applications and the relationship between them. The Sensor-Service ontology is used to infer high-level information from low-level information. To apply a variety of environmental context to intelligent services, the paper uses the rule-based reasoning. This paper implements the proposed intelligent service middleware as a prototype and then shows that the middleware can be used for a variety of USN applications through the performance evaluation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.327-330
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• 2008

Resently as ubiquitous environment rapidly emerges due to the development of network and information communication technology, ubiquitous computing is being noticed as a technology that will take the lead in information technology industry of the future. For the realization of this Ubiquitous Service requires some technique such as situations of environment and recognition of locations by the Sensor Network, then sensor data have to be transferred to an application service after processes. Also the creation rule of registration and search of the event is necessary because the USN sensor data must be possible to specific the multi condition of event which relates on using time. And for using a numerous sensor data provision service, service provider can publish its service in standardized registry for users to search and use the service registry. Currently there is the web service for a WS-Eventing and a UDDI with standard, but the event and the service registry is unnecessary or there is a portion which is insufficient. In this paper, I design and implementated standardzation of event definition for USN application service and service registry structure, standard API.

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.323-325
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• 2008

차량을 USN/RFID 시스템과 결합함으로 차량에 대한 관리를 함으로서 사용자 입장에서 좀 더 편리한 서비스를 제공 받을 수 있다. 현재는 차량에 RIFD 태그를 부착하여 통행료 결제나 주차 관리 등 부분적으로 응용하고 있지만, 이를 차량에 관련된 모든 부분에 적용하여 차량 통합 관리 시스템을 만들고자 한다. 허나 차량 통합 관리 시스템은 사용자들의 차량을 대상으로 RFID 태그를 이용한 정보 관리 서비스이므로 필연적인 개인 프라이버시 침해 문제가 발생 할 수 있어 이에 대한 해결책이 반드시 필요하므로 해결방안에 대하여 연구하였다.

• Annual Conference of KIPS
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• 2010.04a
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• pp.693-695
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• 2010

본 논문에서는 사회 안전 환경을 위한 IP-USN 기반의 멀티미디어 응용 개발 프레임워크에서 네스티드 세션 관리를 위한 RARV 구조에 대하여 기술한다. 네스티드 세션이란 하나의 부모 세션 아래에 여러 개의 자식 세션이 존재하는 것을 말한다. 제안한 시스템에서는 새로 생성된 자식 세션은 기본적으로 부모 세션의 설정을 계승하고, 모든 자원에 대하여 동일한 접근 권한을 갖게 하고, 한 참여자는 하나의 네스티드 세션에만 참여하는 것이 허용되는 특징을 갖는다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2006.04a
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• pp.51-72
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• 2006

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.658-660
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• 2005

최근 인터넷의 성장과 CDMA등의 무선 통신의 활성화로 인하여 이동 중인 차량 내에서 다양한 정보를 사용하기 위한 기술이 개발 중이다. 본 논문에서는 차량 단말에 여러가지 텔레매틱스 서비스를 제공하기 위한 차량 단말, 텔레매틱스 서비스 서버, 텔레매틱스 컨텐츠 서버의 3단계 구조를 가지는 텔레매틱스 서비스 시스템을 제안한다. 제안하는 시스템은 차량 단말과 서비스 서버 사이의 통신 방법 및 서비스 서버 내의 서비스 응용이 다양한 컨텐츠를 제공하기 위한 프레임워크를 제공한다.

• IEMEK Journal of Embedded Systems and Applications
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• v.1 no.1
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• pp.14-19
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• 2006

Integrated development environment (IDE) plays an important role in reducing the developm ent time, thereby improving software development productivity. In recent years, ubiquitous sensor networks (USNs) have become increasingly popular. However their application software is developed mostly using command-line-based tools. Such a development process is not only likely to be error-prone but also inconvenient to debug errors. This paper describes a novel IDE for USN application developers called Nano Esto that provides a single, consistent, and integrated environment for building and executing USN applications. The Nano Esto helps the developers edit and cross-compile source code and download the executable image to the program memory of sensor nodes with just a few button clicks. It also provides support for configuring an application-specific kernel, simulating a wireless sensor network, and estimating power consumption in each sensor node. Currently, Nano Esto runs on Linux as well as on Windows with the same look and feel.

• Journal of Sensor Science and Technology
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• v.19 no.3
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• pp.230-237
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• 2010

In sensor signal conditioning and processing, offset and drift characteristics of an operational amplifier are an important factor when the amplifier is used for a precise sensor signal amplifier. In order to use it in high accuracy, an expensive trimming or a complex compensation circuit is required. This paper presents the improved sensor signal conditioning and processing device for ubiquitous sensor network(USN) application or general purpose by developing a hardware of the circuit for reducing the offset voltage and drift characteristics, and a software for its control and sensor signal processing. We realize better offset voltage and drift characteristics of the signal conditioning circuit using low cost operational amplifiers. The experimental results show that this technique is effective in improving the performance of the sensor signal processing device.

• 한국IT서비스학회:학술대회논문집
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• 2006.05a
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• pp.267-272
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• 2006

일반적으로 거버넌스는 사회가 스스로를 이끌어나가는 과정을 의미하며, 전자거버넌스시스템(electronic governance system)은 이러한 거버넌스 지원을 위한 차세대 전자정부시스템을 의미한다. 전자거버넌스시스템은 주로 정부기관의 기능 강화에 초점을 두고 있는 전자정부시스템과 달리 능동적인 시민참여에 중점을 두고 있으므로 이에 부수되는 정보공유, 보안, 프라이버시, 구성원 사이의 상호 신뢰형성 등의 문제를 해결하여야 한다. 현재 거버넌스 관점에서 행정에 대한 시민참여가 활발하게 논의되고 거버넌스에 대한 이론 및 실증적 연구는 활발히 연구되고 있으나, 전자거버넌스시스템의 개발에 대한 연구는 매우 미약한 실정이다. USN(Ubiquitous Sensor Network)은 유비쿼터스 컴퓨팅 환경의 중요한 한 축으로써 많은 응용 잠재성을 내포하고 있으며, IT839 전략에 따라 국내 USN 인프라스트럭쳐에 대한 활발한 연구${\cdot}$개발 및 시험사업이 진헹되고 있다. 본 논문은 이러한 USN 인프라스트럭쳐를 활용하여 구성원 사이의 신뢰형성을 도울 수 있는 전자거버넌스시스템의 구조에 대하여 논한다.