• The Journal of Society for e-Business Studies
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• v.14 no.3
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• pp.71-85
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• 2009

Nowadays the research and development of various middleware for the ubiquitous computing environment has been demanded and many application services have been provided. The practical ubiquitous computing environment is the world where a variety of services based on RFID/USN devices are integrated with each other and make synergy effects all together. In the end user perspectives, there should be a middleware platform and business logic framework collaborating various services all together to satisfy the user requirements. In addition, the platform should provide the user to describe a scenario based on various event to maximize the collaboration. In this paper, we have proposed business logic framework which is supporting collaboration between heterogeneous service systems based on the user's scenario. We have also tried to show the efficiency and scalability of the proposed framework by providing the result of a couple of tests.

• Journal of the Korea Society of Computer and Information
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• v.12 no.3
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• pp.155-163
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• 2007

In this paper, Though sensors of Ubiquitous Middle-ware System based on RFID/USN can usually be reacted from six mouths to two years, they can be exhausted their power of storage battery only one day by communication rates and ranges. That is, the lifetime of sensor node is depended on how much spending power under wireless communication that can communicate its sensing data to its destination. Therefore, it is necessary that each sensor should be designed the Routing path to its destination, in order to remote collecting data. But, in order to improve lifetime of sensor node and modify inner setting, it is opposite to simple searching path method of sensor node by entering external commands. accordingly, 1:n sensor arrangement of n form command and data send-receive that is possible simulation do without interference other sensors and research to different sensor data analysis and conversion ways to convert Sensing data that accept from sensors to actuality information.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.2
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• pp.221-226
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• 2010

Ubiquitous computing is technology that provides services appropriate for the user. At places where environmental and situational context are relevant in making the determination of what services are appropriate, there are sensor nodes installed, which automatically collect, manage and control environmental information. In this computing environment, in order to meet the requirements of services provided to users, a context awareness system is needed for context awareness processing. In this thesis, using RFID/USN sensors, the context of a user entering and leaving an area was produced, and the user's identification information was received via the RFID reader and antenna. At the same time, to decide whether or not to allow access for the user, a distance sensor node was installed to collect context data. Based on this, a system that provides practical services needed in real life for users was designed and implemented. The context of a user entering an area was produced, which the system recognized and provided appropriate services for the user.

• Journal of Digital Convergence
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• v.6 no.3
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• pp.139-147
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• 2008

-Healthcare란 건강관련 정보를 시간과 공간의 제약 없이 수집, 처리, 전달, 관리할 수 있게 해줌으로써 원격지 의료서비스를 제공하는 것을 말한다. 본 논문은 USN을 활용하여 원격에서 측정된 의료정보를 수집하여 서버에 전달하는 미들웨어 시스템을 시뮬레이션 했다. 헬스 케어기기에서 측정된 데이터를 USN을 통해 원격지의 서버로 전송하는데, 데이터의 전송에는 근거리 무선통신기술인 Zigbee를 사용하였다. 이러한 과정에서 헬스 케어기기와 서버사이에 미들웨어를 두어 측정된 이진코드 데이터를 텍스트데이터로 변환하여 서버의 헬스케어 시스템에 저장한다. 서버에 저장된 환자들의 의료정보는 의료진이 활용할 수 있도록 했다. 또한, 미들웨어 시스템에서는 데이터의 필터링을 통해 불필요한 데이터를 삭제해 서버의 부하를 줄여서, 외부 어플리케이션의 질의에 대한 정보제공을 용이하게 했다.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.770-775
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• 2009

Along with the advance of USN technology in a human-oriented informatization society these days, society is quickly changing into a ubiquitous computing society in which information even between objects can be organically combined and utilized. In order to successfully build such a ubiquitous computing society, it is indispensable to have core USN technologies such as USN sensor nodes, sensor networks, USN middleware, and USN applied services that efficiently manage sensing information collected from sensor nodes, and support the abstraction function for the composition of sensor networks. In order to process the transmission event of sensing values that are generated from various USN terminal devices, this study designs a process that performs the abstraction of data for the efficient process of diverse sensing values transferred from USN and RFID terminal devices.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.10
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• pp.975-981
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• 2006

This paper shows a feasibility analysis results on RFID for car positioning system. Usually, a car navigation is mainly based on GPS combined with map-matching. However, in the case of poor visibility of satellites, GPS can not supply accurate position information continuously. In recent years, RFID has been considered to be one of key technologies in positioning and localization area. But its application and research results in the area of vehicular positioning are not popular. RFID system consists of tag, reader, antenna and software such as drivers and middleware. The main function of RFID system in a vehicular positioning is to retrieve ID recorded position information from tags which set on the center of road. We propose a positioning method for vehicles using RFID and we present some indoor and outdoor experiment results to show that the proposed method is available in vehicle operational environments.

• 한국IT서비스학회:학술대회논문집
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• 2008.11a
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• pp.285-288
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• 2008

최근 IT 패러다임은 인터넷 중심에서 인간과 사물, 컴퓨터가 융합되는 기술로 급속히 전환되고 있다. 이를 위해 인간과 사물, 사물과 사물 사이 네트워크화를 위해서 RFID/USN 분야가 핵심 IT 산업군으로 형성되고 있다. USN을 활용한 다양한 서비스 가운데 u-Healthcare는 큰 사회적 이슈로 대두되고 있다. 이러한 u-Healthcare system의 원활한 활용을 위해서는 u-Healthcare system을 지원하는 미들웨어(Middleware)에 대한 연구가 필요하다. 따라서 본 연구에서는 미들웨어의 기능 중 센서(Sensor)를 통해 획득한 데이터의 정확성을 높이는 방법에 초점을 두었다. 이를 위하여 멀티 스레드(Multi Thread)방법을 u-Healthcare 미들웨어에 적용하여 다양한 어플리케이션에서 요구하는 개별 데이터의 정확성을 향상 시키는 방안을 연구하였다.

• 한국디지털정책학회:학술대회논문집
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• 2005.11a
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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.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.541-544
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• 2008

e-비즈니스 환경 하에서 전자적 데이터 교환 또는 WEB을 이용한 비즈니스 트랜잭션 처리를 통해 산업 부분별 자동화나 정보화가 활발히 진행되었다. 전자적으로 데이터를 처리함으로 인해 기존 오프라인을 이용한 비즈니스 환경 보다는 처리 속도나 처리 시간이 단축되었으며 비용도 많이 절감되었다. 그러나 점차 실시간적으로 데이터를 처리하거나 실시간적으로 화물에 대한 흐름을 추적하고자 하는 사용자들의 요구사항이 도출되기 시작하였다. 이에 RFID, USN 등의 유비쿼터스 개념과 기술을 이용한 u-비즈니스가 도입되어 각 분야에 활발히 적용되고 있다. 특히 유통이나 운송 등 물류 분야에 유비쿼터스 기술이 적용됨으로 실시간으로 데이터를 수집할 수 있어 화물의 흐름 추적을 용이할 수 있는 기반이 되고 있다. 본 논문에서는 새로운 비즈니스 환경에 적합하도록 EPC Global 표준에 따라 개발된 RFID 미들웨어를 항만 물류 비즈니스에 적용할 수 있는 비즈니스 모델을 정의하였다. 또한 정의한 비즈니스 모델을 항만 물류 분야에 적용한 사례와 적용 결과에 대해 논의하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10b
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• pp.291-295
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• 2007

본 논문에서는 유헬스를 위한 적응형 미들웨어를 제안한다. 제안하는 적응형 미들웨어의 특징은 USN(Ubiqitous Sensor Network)과 RFID를 동시에 지원하는 미들웨어로 다음과 같은 특징을 가진다. 첫째, 사용자 인식수단으로 RFID 태그와 Zigbee sensor를 동시에 지원한다. 둘째, RFID Reader와 Zibee 센서가 수집한 데이터를 filtering하여 주기적으로 응용 프로그램에 전달한다. 셋째, 이동하는 사용자에 대하여 realtime health monitoring을 지원한다.