• Journal of Information Technology Applications and Management
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• 제13권3호
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• pp.1-28
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• 2006

In the ubiquitous computing environments. people usually carry multiple information technology devices with them. Personal device network (PDN) refers to the way how people connect multiple IT devices for their personal as well as professional purposes. Even though it has been Quite popular to construct the PDN in ubiquitous computing context, not much research has been conducted on how people actually connected multiple devices and what influences their methods of connection. In this paper we conducted a content analysis on community bulletin boards of IT devices and a contextual inquiry with expert users of PDN for investigating the configurations with which users connect multiple IT devices. Base on the results of two related studies, we identified three major types of PDN configurations, and key factors that influence the configurations of PDN. We conclude this research with guidelines to design a set of devices for each of the three configuration types.

• 정보보호학회논문지
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• 제16권2호
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• pp.3-12
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• 2006

모바일 디바이스, PDA, 센서들의 확산은 실생활 공간이 지능적이고 향상된 서비스를 제공하는 스마트 공간으로 전환되는 유비쿼터스 컴퓨팅 환경이 구축될 수 있도록 하였다. 그러나 모바일 디바이스, PDA, 센서들과 같은 다양한 유비쿼터스 디바이스들의 초기 설계 단계부터 프라이버시 문제를 고려하지 않는다면 유비쿼터스 감시체제가 구축될 위험성이 있다. 또한 유비쿼터스 컴퓨팅 환경에서의 다양한 디바이스들은 대체로 컴퓨팅 연산 능력이 적기 때문에, 공개키 기반의 암호기술을 적용하는 것은 부적절할 수 있다. 본 논문에서는 유비쿼터스 컴퓨팅 환경에서의 사용자 프라이버시를 위하여 익명성이 보장되고, 컴퓨팅 연산 능력이 적은 디바이스를 위한 효율적인 사용자 인증 및 키 동의 프로토콜을 제안한다.

• 한국정보통신학회논문지
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• 제10권6호
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• pp.1101-1105
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• 2006

웹서비스의 이벤트를 수신하기 위한 Web Services Eventing과 WS-Notification과 같이 현존하는 관련 표준은 하나의 이벤트 묶음을 무조건적으로 수신하거나 하나의 이벤트에 하나의 조건을 제시할 수밖에 없다는 것이 문제점으로 지적되고 있다. 그러나 실제로 이벤트들을 처리하기 위해서는 하나의 이벤트를 수신할 때도 다양한 조건을 제시할 수 있도록 하여, 동일한 이벤트를 받았을 때에도 다양한 조건식에 따라 원하는 작업을 수행할 수 있도록 하는 유연성을 제공하여야 한다. 본 논문은 그러한 유연성을 제공하는 유비쿼터스 웹서비스 환경에서 이벤트 기반의 룰 처리 기법에 대해서 살펴보도록 한다.

• 한국인터넷방송통신학회논문지
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• 제8권3호
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• pp.15-23
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• 2008

본 논문에서는 유비쿼터스 지능공간의 구현을 위해 CIB 프레임워크를 제안한다. 유비쿼터스 지능공간에서 유비쿼터스 모바일 디바이스는 주변 상황을 스스로 인지, 판단하여 서비스를 제공한다. CIB 프레임워크에서 유비쿼터스 모바일 디바이스는 리소스 및 정보의 효율적인 관리를 위해 RDF 형태의 저장방식을 가진다. 이 저장공간은 새로운 정보의 추가, 수정, 삭제에 유연하며, SPARQL을 이용하여 질의에 응답한다. 또한 주변 유비쿼터스 모바일 디바이스에 내부정보를 XML 형태로 제공하며, 외부에서 수집된 정보를 자신의 디바이스에 맞게 변환하여 저장하는 기능도 제공한다.

• Journal of Computing Science and Engineering
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• 제5권2호
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• pp.141-149
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• 2011

Many distributed and heterogeneous services and devices are accessible in ubiquitous computing environment, so interoperating those services and devices is one of the key tasks in implementing ubiquitous applications. We used to use script languages in integrating such interoperating components and services. However currently available most script languages are not suitable for ubiquitous environment because there are so diverse forms of interoperation targets such as service objects, web, legacy objects and programmable devices. So it is worthwhile designing a new script language well-suited to ubiquitous environment. In this paper, we propose a new script language, called Ubiscript, for the ubiquitous environment. We develop and adopt several unique language features such as remote scope, multiple contexts, web and legacy objects, remote exception handling, etc. in Ubiscript to overcome the limitations of conventional script languages. In this paper, we also describe the implementation of Ubiscript and its runtime system. A couple of ubiquitous applications were developed in Ubiscript, and the applications are tested on the runtime system. According to our experiences and evaluation, Ubiscript turned out to have a high potential in its expression power and contribution to improving ubiquitous application developers' productivity.

• 대한의용생체공학회:의공학회지
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• 제30권3호
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• pp.185-190
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• 2009

Biomedical mobile devices for ubiquitous healthcare consist of biomedical sensors and communication terminal. They have two types of configuration. One is the sensor-network type device using wired or wireless communication with intelligent sensors to acquire biomedical data. The other is the sensor embedded type device, where the data can be acquired directly by itself. There are many examples of sensor network type, such as, fall detection sensor, blood glucose sensor, and ECG sensors networked with commercial PDA phone and commercial phone terminal for ubiquitous healthcare. On the other hand, sensor embedded type mounts blood glucose sensor, accelerometer, and etc. on commercial phone. However, to enable true ubiquitous healthcare, motion sensing is essential, because users go around anywhere and their signals should be measured and monitored, when they are affected by the motion. Therefore, in this paper, two biomedical mobile devices with motion monitoring function were addressed. One is sensor-network type with motion monitoring function, which uses Zigbee communication to measure the ECG, PPG and acceleration. The other is sensor-embedded type with motion monitoring function, which also can measure the data and uses the built-in cellular phone network modem for remote connection. These devices are expected to be useful for ubiquitous healthcare in coming aged society in Korea.

• 제어로봇시스템학회논문지
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• 제10권6호
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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.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권2호
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• pp.174-190
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• 2010

In ubiquitous computing, invisible devices and software are connected to one another to provide convenient services to users [1][2]. Users hope to obtain a personalized service which is composed of customized devices among sharable devices in a ubiquitous smart space (which is called USS in this paper). However, the situations of each user are different and user preferences also are various. Although users request the same service in the same USS, the most suitable devices for composing the service are different for each user. For these user requirements, this paper proposes a device recommender system which infers and recommends customized devices for composing a user required service. The objective of this paper is the development of the systems for recommending devices through context-aware inference in peer-to-peer environments. For this goal, this paper considers the context and user preference. Also I implement a prototype system and test performance on the real ubiquitous mobile object (UMO).

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.836-841
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• 2008

21세기를 들어서면서 본격적으로 차세대 IT패러다임으로 등장한 유비쿼터스(Ubiquitous) 분야는 정보기술의 패러다임이 PC와 인터넷 중심에서 유비쿼터스로 이동하면서 미래 유비쿼터스 시장을 선점하기 위한 세계 주요국가와 IT기업들이 치열한 전쟁터로 인식되고 있다. 본 연구에서는 유비쿼터스 디바이스에 관련된 국내외 기술 및 연구동향을 알아보고, 유비 쿼터스 사회의 진화에 따른 미래효과와 그에 따른 연구방향 등을 살펴보도록 한다.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2005년도 종합학술대회
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• pp.78-84
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• 2005

As the research activities related to 'Ubiquitous Computing' whose concept was introduced by Mark Weiser are growing, RFID(Radio Frequency Identification) technology has recently gained attention as a technology to advance the ubiquitous computing and a lot of related researches are also in progress. Research works done so far are mainly linked to the situation that the research outputs apply to meet the requirements for asset tracking and data sharing with partners over supply chain by using fixed RFID readers. However, it is essential that users have access to real-time information about the tagged objects and services whenever and wherever they want in the era of ubiquitous computing, so mobile devices-including PDA, smart phone, cellular phone, etc - which are equipped with an RFID reader can be regarded as an essential terminal for users living in ubiquitous computing environment. As far as the application with mobile devices are concerned, there are many considerations due to their limited capabilities of data processing, battery consumption and so on. In this paper, we review the generic RFID network model and introduce the revised RFID network model in consideration of incorporation with mobile devices equipped with an RFID reader. Also, we derive the requirements for software embedded within an RFID- enabled mobile terminal and then discuss essential components for implementation. Moreover, we develop the applications for asset management at museum by using mobile RFID network model.