• Journal of Information Technology Applications and Management
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• 제14권2호
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• pp.1-10
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• 2007

The ubiquitous computing system is expected to be widely utilized in digital home, logistics control, environment/disaster management, medical/health-care services and other applications. The ubiquitous sensor network (USN) is a key infra-structure of this system. Nodes in the USN are exposed to adverse environments and required to perform their missions with very limited power supply only. Also the sensor network is composed of much more nodes. In case some node consumes up its power capacity under a certain required level, the network topology should change and re-routing/ re-transmission of data is necessitated. Resultantly communication protocols studied for conventional wireless networks or ad-hoc networks are not suitable for the sensor network. Schemes should be devised to control the efficient usage of node power in the sensor network. This paper proposes a routing algorithm to enhance the efficiency of power consumption for USN node and analyzes its performance by simulation.

• Journal of Information Processing Systems
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• 제14권2호
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• pp.286-308
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• 2018

The availability of powerful and sensor-enabled mobile and Internet-connected devices have enabled the advent of the ubiquitous sensor network (USN) paradigm. USN provides various types of solutions to the general public in multiple sectors, including environmental monitoring, entertainment, transportation, security, and healthcare. Here, we explore and compare the features of wireless sensor networks and USN. Based on our extensive study, we classify the security- and privacy-related challenges of USNs. We identify and discuss solutions available to address these challenges. Finally, we briefly discuss open challenges for designing more secure and privacy-preserving approaches in next-generation USNs.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.1027-1030
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• 2005

본 논문에서는 공중 무선망과 비인가 무선망과 같은 다양한 무선 네트워크가 존재하는 USN(Ubiquitous Sensor Network) 환경에서 사용자의 복잡한 설정이나 조작 없이 무선 네트워크에 접속할 수 있게 해주는 인터페이스로서의 적응형 무선 단말(Adaptive Mobile Terminal)의 개발 동향을 분석하였다. 이러한 적응형 무선 단말은 사용자의 이동이나 무선 자원의 변동 상황에 따라 능동적으로 사용자에게 끊김 없는 서비스를 제공할 수 있어야 한다. 따라서 적응형 이동 단말은 접속 가능한 무선 네트워크별로 독립적인 하드웨어 구조를 가져야 한다.

• 한국항행학회논문지
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• 제19권6호
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• pp.643-647
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• 2015

최근 센서와 네트워크 기술을 접목한 유비쿼터스 기술이 부각되고 있으며 이를 USN (ubiquitous sensor network)라 한다. 본 논문에서는 이러한 USN 기술을 기반으로 영유아의 건강과 안전을 관리하기 위해 스마트 센서를 이용한 Baby care 모바일 어플리케이션을 제안하고 개발하였다. 개발한 모바일 어플리케이션은 영유아의 낙상 감지, 울음 감지, 발열 감지 등의 정보를 개발한 모바일 어플리케이션의 화면에 나타내었다. 개발된 모바일 어플리케이션은 모의 실험을 통하여 확인하였다.

• 한국컴퓨터정보학회논문지
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• 제15권12호
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• pp.151-162
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• 2010

유비쿼터스 컴퓨팅 환경을 구축하기 위하여 자동 식별, 센서 네트워크, 홈 네트워크 등의 다양한 분야에 대한 연구가 진행되고 있다. EPCIS(EPC Information Services)는 RFID 용용 시스템 개발에 필요한 태그 정보를 관리하는 저장소와 관련하여 EPCglobal에서 제안된 표준이다. 본 논문에서는 일반적인 객체 인식과 환경 정보 변화에 의존하는 객체 검색을 가능하게 하기위해 EPCIS 저장소를 설계하고 개발 및 구현한다. 또한 위치를 기반으로 하고 지속적으로 변하는 대용량 자료라는 면에서 RFID 자료와 유사한 센서 데이터를 통합처리 관리하여 USN(Ubiquitous Sensor Network) 환경 변화에 따른 객체 인식 등의 융합 처리가 가능하도록 설계한다.

• 대한전자공학회논문지TC
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• 제46권2호
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• pp.73-80
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• 2009

군사용이나 환경 감시등의 영역에서 응용되고 있는 유비쿼터스 센서 네트워크(Ubiquitous Sensor Network)는 센서 정보의 도청이나, 비정상적 패킷의 유통, 메시지의 재사용 등 데이터의 위 변조와 같은 외부의 공격에 쉽게 노출되는 환경에서 동작하기 때문에, 보안은 필수적으로 갖추어져야 하는 중요한 기능이다. 저전력, 초소형, 저비용의 장점을 갖는 ZigBee는 유비쿼터스 센서 네트워크를 구현하는 최적의 기술로 주목받고 있다. 그러나 ZigBee 보안 시스템에는 심각한 문제점들을 가지고 있다. 본 논문에서는 USN의 대표적인 예로 ZigBee 보안 시스템이 가지고 있는 문제점들을 자세히 분석하고, 이를 해결하여 USN에 적합한 보안 프로토콜을 새롭게 제안하고 그 효율성을 비교 분석한다.

• 디지털융복합연구
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• 제4권1호
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• pp.31-41
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• 2006

This article introduces developing trends of an 'Ubiquitous Interface' as an access method for use of various network resources, such as public wireless networks and un-licensed wireless networks in ubiquitous sensor network environments, without troublesome settings or operations by users. 'Ubiquitous Interface' is a relatively wide sense meaning not only physical interface of specified device or between processors, but anything method for access USN. These 'Ubiquitous Interface' able to provide seamless services that adapt autonomously to the user's movements and changes in the state of wireless resources. Recently, strongly recommended current technologies are RFID, NFC, Multi-mode mobile terminal, UMA mobile terminal and Wearable computer as a future ubiquitous interface. These technologies are have to have flexibility and multiple physical communication channels for seamless service hand over and serve easy connection at huge USN to user. Also, they have to must have flexible software structure. Finally, through the 'Ubiquitous Interface', we will be experience of seamless communication and realize a real liberty of communication.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2005년도 추계학술대회
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• pp.299-311
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• 2005

This article introduces developing trends of an "Ubiquitous Interface" as an access method for use of various network resources, such as public wireless networks and un-licensed wireless networks in ubiquitous sensor network environments, without troublesome settings or operations by users. "Ubiquitous Interface" is include a relatively wide sense meaning not only physical interface of specified device or between processors, but anything method for access USN. These "Ubiquitous Interface" able to provide seamless services that adapt autonomously to the user's movements and changes in the state of wireless resources. Recently, strongly recommended candidates are RFID, NFC, Multi-mode mobile terminal, Wearable computer and OSGi for integrated digital home networking system as a future ubiquitous interface. These candidates are have to have flexibility and multiple physical communication channel for seamless service hand over and serve easy connection at huge USN to user. And, must have flexible software structure and multi-functional middleware. Consequently, for more enhance performance of an ubiquitous interface and developing, need more structured and integrated future plan.

• 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.

• 한국IT서비스학회지
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• 제8권3호
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• pp.171-184
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• 2009

Since the development of the Distributed Hash Tables (DHTs), the distributed lookup services are one of the hot topics in the networking area. The main reason of this popularity is the simplicity of the lookup structure. However, the simple key based search mechanism makes the so called "keyword" based search difficult if not impossible. Thus, the applicability of the DHTs is limited to certain areas. In this paper. we find that DHTs can be used as the ubiquitous sensor network (USN) metadata lookup service across a large number of sensor networks. The popularity of the Ubiquitous Sensor Network has motivated the development of the USN middleware services for the sensor networks. One of the key functionalities of the USN middleware service is the lookup of the USN metadata, by which users get various information about the sensor network such as the type of the sensor networks and/or nodes, the residual of the batteries, the type of the sensor nodes. Traditional distributed hash table based lookup systems are good for one sensor network. However, as the number of sensor network increases, the need to integrate the lookup services of many autonomous sensor networks so that they can provide the users an integrated view of the entire sensor network. In this paper, we provide a hybrid lookup model, in which the autonomous lookup services are combined together and provide seamless services across the boundary of a single lookup services. We show that the hybrid model can provide far better lookup performance than a single lookup system.