• 센서학회지
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• 제16권4호
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• pp.247-253
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• 2007

Low power consumption sensor network platform (sensor node) for sensor networking with IEEE 802.15.4 protocol was fabricated. The sensor node used ceramic bar type antenna for increasing RF signal performance and decreasing PCB size occupied by antenna. The communication range of the fabricated sensor node was about $20{\sim}30$ m in open environment with 915 MHz frequency bandwidth and well supported by Tiny OS. The sensor node have good connectivity with various external devices by RS-232, I2C, analogue and digital expansion board, hence, this sensor node can be applied to various applications in wireless sensor network and ubiquitous sensor network.

• 한국정보통신학회논문지
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• 제12권6호
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• pp.1128-1133
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• 2008

상황인식(Context-aware)은 인간-컴퓨터 상호작용의 단점을 극복하기 위한 방법으로써 많은 주목을 받고 있다. 본 논문에서는 UoC(Ubiquitous system on Chip)로 구현될 수 있는 상황인식 시스템 구조를 제안한다. 본 논문은 유비쿼터스 컴퓨팅 시스템을 구현하기 위해 CRS(Context Recognition Switch)와 DOS(Dynamic and Optimal Standard)의 개념을 포함한 Pre-processor, HPSP(High Performance Signal Processor), Network Topology Processor의 부분으로 구성된 UoC Architecture를 제안한다. 또한, IEEE 802.15.4 WPAN(Wireless Personal Area Network) Standard에 의해 구현된 UoC를 보여준다. 제안된 상황인식 기반의 UoC Architecture는 주거 환경에서 컨텍스트를 인식하여 사용자를 지원하는 지능형 이동 로봇 등에 적용될 수 있을 것이다.

• 산업공학
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• 제19권1호
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• pp.9-18
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• 2006

In this paper, we explore the ubiquitous system that provides new business opportunities in the context of digital convergence. Exploiting the value network of the proposed ubiquitous system, we analyze strategic market drivers that define the speed and direction of the evolution path for ubiquitous industries. Motivated by the dynamic growth of ubiquitous industry, we design a set of ubiquitous business models that pave the way for firms to identify profitable business cases. In addition, we analyze the evolution path of the proposed business model such that the model can be implemented in the life-cycle of ubiquitous industry. Futhermore, we develop a modeling framework for selecting a suitable business model and for evaluating the performance of the selected business model.

• International Journal of Contents
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• 제2권2호
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• pp.6-9
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• 2006

The style of war in the $21^{st}$ century became digitalized cooperative union tactic, which relies heavily on the system providing real time information. Critical information is provided during the war from sensing to shooting. Therefore, epochal development in observation, reconnaissance (ISR), commanding (C4I) and precision strike (PGM) are necessary. Application of ubiquitous computing and network technologies in national defense is necessary for carrying out with various types of wars in the $21^{st}$ century. Therefore, the author wants to research core technology sector that can be developed and applied in preparation of ubiquitous national defense era. Also plans for applying recent u-Defense technology to the military sector had been suggested. Particularly, the author have suggested plans for utilizing combined future information technologies such as ad-hoc network, RFID for the logistic supply in construction of u-Defense system. By utilizing these information technologies, combat power and strategic capabilities of the military can be enhanced greatly.

• 정보통신설비학회논문지
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• 제8권3호
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• pp.122-131
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• 2009

Ubiquitous-Transportation sensor network is able to realize a vehicle ad-hoc network. Since there are some problems in an existing ITS system, the new technology and traffic information strategies are requirements in this advanced system, u-TSN. The purposes of this paper is to introduce the components on u-TSN system, establish new traffic strategies for this system, and then evaluate these strategies by making a comparative study of ITS and using micro traffic simulator, AIMSUN. The strategy evaluated by AIMSUN is position-based multicast strategy which provides traffic information to vehicles using V2I (vehicle to Infrastructure) communication. This paper focuses on the providing real-time route guidance information when congestion is occurred by the incidents. This study estimates total travel time on each route by API modules. Result from simulation experiments suggests that position-based multicast strategy can achieve more optimal network performance and increased driver satisfaction since the total accumulated travel times of both the major road and the total system on position-based multicast strategy are less than those on VMS.

• Journal of information and communication convergence engineering
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• 제5권4호
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• pp.382-388
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• 2007

Indoor location system using wireless sensor network technology was applied for the status evaluation and activity monitoring of elderly person or chronic invalid at home. Location awareness application is transparent to the daily activities, while providing the embedded computing infrastructure with an awareness of what is happening in this space. To locate an object, the active ceiling-mounted reference beacons were placed throughout the building. Reference beacons periodically publish location information on RF and ultrasonic signals to allow application running on mobile or static nodes to study and determine their physical location. Once object-carried passive listener receives the information, it subsequently determines it's location from reference beacons. By using only the sensor nodes without any external network infrastructure the cost of the system was reduced while the accuracy in our experiments. was fairly good and fine grained between 7 and 15 cm for location awareness in indoor environments. Passive architecture used here provides the security of the user privacy while at the server the privacy was secured by providing the authentication using Geopriv approach. This information from sensor nodes is further forwarded to base station where further computation is performed to determine the current position of object and several applications are enabled for context awareness.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2005년도 춘계학술발표대회 논문집
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• pp.88-92
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• 2005

The Ubiquitous life is not a life style that exists in a science fiction or in a far distance future anymore. The Combination of electronic and physical space, this new type of space was created by the ubiquitous network system, and this system will offer us new life style. Also the pattern of our living will be changed by the information that has obtained from this ubiquitous network system. By offering a new way of communication from the ubiquitous surrounding, our life style such as shopping, medical treatment, banking, and working conditions and a notion such as the preference in a job title would have shifted. This study have arrived at the development of the high technology, in other words Ubiquitous age , I have considered the notion of home-network that have observed by the preceding investigators as well as the theoretical consideration of residential space in ubiquitous surrounding. After I look into the usages and examples of residential space in ubiquitous surrounding of today's society, I hope that this would be helpful for the design that strives for the comfortable living in this ubiquitous age.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.243-246
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• 2005

Recent ubiquitous computing environments increasingly impact on our lives using the current technologies of sensor network and ubiquitous services. In this paper, we propose ubiquitous architectural framework for ubiquitous sleep aid service(UbiSAS) in the subset of ubiquitous computing for refreshing of human's sleep. And we examine technical feasibility. Human can recover his health through refreshing sleep from fatigue. Ubiquitous architectural framework for UbiSAS in digital home offers agreeable sleeping environment and improves recovery from fatigue. So we present new concept of ubiquitous architectural framework dissolving stress. Specially, we apply context to context-aware framework module. This context is transferred to context adaptive inference engine which has service invocation function in intelligent agent module. Ubiquitous architectural framework for UbiSAS using context adaptive rule inference engine without user intervention is technical issue. That is to say, we should take sleep comfortably during our sleeping. And sensed information during sleeping is changed to context-aware information. This presents significant information in context adaptive rule inference engine for UbiSAS. This information includes all sleeping state during sleeping in context-aware computing technique. So we propose more effective and most suitable ubiquitous architectural framework using context adaptive rule inference engine for refreshing sleep in this paper.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2006년도 춘계학술발표대회
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• pp.947-950
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• 2006

최근 들어 언제 어디서나 컴퓨팅이 가능한 유비쿼터스 컴퓨팅(Ubiquitous Computing) 사회가 되면서 개인의 컴퓨팅 환경 의존도가 증가되었고, 따라서 사이버공격으로 인한 개인생활의 위협도 증가할 수밖에 없게 되었다. 더욱이 향후에는 원격진료와 같이 개인의 생명과 직결된 유비쿼터스 서비스가 활성화될 것이므로 사이버공격으로 인해 재산뿐 아니라 생명까지 위험에 처하는 경우가 늘어나게 될 것이다. 이로 인해 유비쿼터스 환경에 적합한 홈네트워크 보안(Home Network Secutity)의 중요성이 부각되게 되었다. 본 논문에서는 안전한 U-홈네트워크(Ubiquitous-Home Network) 구축에 필요한 기술들을 유 무선 기준으로 구분하고, U-홈네트워크 환경에서 발생할 수 있는 다양한 침해유형을 분석하여, 이를 막아낼 수 있는 대응방안을 수립하고, 안전한 U-홈네트워크 구축을 위해 필요한 기존의 보안요구사항들을 살펴본 후에 U-홈네트워크에 적합한 추가적 보안사항을 제안하고자 한다.

• 한국컴퓨터정보학회논문지
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• 제10권1호
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• pp.157-166
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• 2005

유비쿼터스 시대와 더불어 미용학의 헤어분야도 발전하고 있다. 본 논문에서는 유비쿼터스 네트워크에서 디지털 헤어 체인징을 설계하고 구현한다. 미용사가 시술하기 위해 디지털 카메라를 이용하여 고객의 얼굴 모습을 촬영한다. 인터넷에 접속하여 고객의 얼굴과 헤어가 모니터에 나타나면, 웹 서버에서 보유한 커트, 퍼머, 업스타일, 염색, 긴 머리 등의 디지털 콘텐츠를 이용하여 이동단말기에서 고객의 헤어모습에 대한 선택과 호응을 얻는다. 미용사는 이동단말기의 헤어 디자인 이미지를 보면서 고객의 헤어를 시술 한 후, 다시 디지털 카메라로 찍어 웹 서버에 자료를 업 데이트 한다. 고객은 이 사진을 자신의 이동단말기에 저장한다. 유비쿼터스 네트워크에서 이를 적용하기 위한 유비쿼터스 헤어 체인징 시스템을 설계하고, 디지털 헤어 콘텐츠와 온라인 인터넷 시스템 및 이동단말을 통한 시스템을 구현하여 미용 정보사회 발전에 기여하고자 한다.