• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.10
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• pp.4531-4535
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• 2011

In this paper, USN(Ubiquitous Sensor Network) is used in the structure of the tree routing was implemented in embedded systems. Tree Routing in the USN to the sink node to transmit sensor data is one of the techniques. When routing, sensor data is transmitted based on pre-defined ID according hop number. In order to have optimal routing path, the current state of the wireless sector and the sensor node informations were used. Also, received sensor data and the results of the tree routing by implementing an embedded system. This embedded system can be applied to a portable sensor information collecting system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.893-895
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• 2012

The rapid spread of Internet and network technology advances the current USN (Ubiquitous Sensor Network) in order to realize research is taking place. USN individual sensor information of the sensor nodes to provide the service is equipped with various kinds of sensors. To do this, you can use a service unspecified XML-based Web services to leverage in the standardized data representation language is needed. In this paper, the required sensor information expressed in a standardized form for USN application service was designed in the sensor data representation language. The USN-based technologies and services in the field will be utilized to activate.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.815-816
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• 2011

Nowadays, the Study is going on develop USN (Ubiquitous Sensor Network) with Diffusion of the Internet and development of computer network technology. USN sensor nodes equipped with various types of sensors provide sensor information to each individual sensors. To do this, there needs standardized data description language for allowing many people to use based on XML in web-service enviroment. In this paper USN sensor information required for application services in a standardized form to describe the sensor data representation language was designed. USN-based technology utilized in the field, and will be utilized for service activation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.7
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• pp.1459-1466
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• 2009

In ubiquitous environment, various and amount of sensor data information occur continuously and periodically about thing and user from RHO, sensor network of various space. Such, the users from among many of provider who provide sensor service should find service that themselves is wanted. And when service use, service right to user should be provided. But in the current environment of the USN(Ubiquitous Sensor Network) Application Service, there is no the registry to find these services but only business- oriented UDDI(Universal Description Discovery, and integration). In addition, when service use, service right to user should be provided but current services provided only services one of the conditions or events. Therefore, rules-based processing system of service event that can provide service according various conditions and events is need. In this paper research into service registry for sensor service search with reference to existing UDDI and event processing system for USN application service with reference to event rule based on web service as WS-ECA(Web Service-Event Condition Action).

• 한국IT서비스학회:학술대회논문집
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• 2008.05a
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• pp.419-424
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• 2008

최근 네트워크 및 정보통신 기술의 발달로 유비쿼터스(Ubiquitous) 환경이 구체화되면서 미래의 정보 기술 산업을 주도할 유비쿼터스 센서 네트워크(Ubiquitous Sensor Network : USN)가 주목받고 있다. 이러한 USN기반의 서비스는 각종 센서들로부터 인식된 데이터를 수집하고 이를 가공하여 사용자가 이해하기 쉽게 USN 자원에 대한 정보를 전달해야 한다. 그러나 USN자원에 대한 정보를 사용자가 이해하기 쉽도록 웹 상에서 시각적으로 표현하기 위한 연구는 보이지 않고 있다. 본 논문에서는 USN 데이터를 크게 센싱데이터와 메타데이터로 분류하고 이를 효과적으로 표현할 수 있는 시각적 요소들을 제안하였다. 그리고 사용자 질의에 대한 응답을 분석하여 각 응답 유형에 따라 시각적 요소를 효과적으로 조합하여 사용자가 쉽게 인지할 수 있는 웹 페이지를 설계 및 구현하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.6
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• pp.1051-1057
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• 2009

USN(Ubiquitous Sensor Network) is used to provide many services such as bridge monitoring, cultural properties monitoring, river monitoring, protection of an old and feeble person, management and control of a city and circumstance monitoring, etc. A RF transceiver is needed for implementing USN. In this paper the implementation and the design of a RF transceiver for sensor nodes operating in 2.4GHz frequency band are presented. The design procedure of AGC, a receiver and a transmitter is described. And the performance of the implemented RF transceiver is also tested. The test results of receiver sensitivity, receiver dynamic range, frequency stability, phase noise, output power of transmitter, flatness and spectrum mask are presented.

• Convergence Security Journal
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• v.5 no.4
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• pp.49-58
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• 2005

We propose a specific ubiquitous sensor network (USN) architecture as a promising candidate of the future telemedicine model which offers the patient's mobility and more cost-efficient medical care system. This new USN architecture is a kind of cell-based secure sensor network supporting encrypted multi-casting communications and it has a hybrid routing protocol by adapting flat routing to hierarchical routing. For the patient's privacy and the protection of patient's vital information from eavesdropping, we adopt a lightweight PKI-based secure communication protocol with some formal presentation on its core procedure.

• Journal of Biosystems Engineering
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• v.36 no.2
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• pp.122-129
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• 2011

This study was performed to develop a wireless system for measuring agricultural atmospheric factors using ubiquitous sensor network(USN). In the study, temperature, humidity and light intensity were selected and evaluated as major agricultural atmospheric factors. An USN system was designed and implemented by using Zigbex I and II (mote sensor nodes of MICA series) provided by Hanback Electronics, Korea. The system was tested in a greenhouse and an orchard. The experiment results showed that the suggested USN measuring system would be very effective on comprehensive measurement of the selected factors on the basis of time, day, spatial sequence with reasonable costs.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.1022-1025
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• 2009

USN(Ubiquitous Sensor Network) is a core infrastructure that makes come true the u-life in the ubiquitous society through various services of area such as u-city and u-Health. Therefore, we need to reseach about the domestic standards to establish the core technique of USN. Currently, the status of USN standards is most of technical standard and reseach that are technology for sensor node implementation and a protocol for energy-efficient communication and interlock with existing network. But, Standard and reseach for sensor network, integration management of heterogeneous sensor networks for USN application, sensing data management and USN database structure definition such as application and middleware are weak level. In this paper, we researched for standard development of the domestic sensor network service and relevant standard analysis to configure SWE(Sensor Web Enablement) of OGC(Open Geospatial Consortium) for standarded plattform technoloy in part of the middleware. Also we researched that it's a connection between domestic TTA (Telecommunications Technology Association) standards and SWE Standard. Finally, we researched for standard service plattform architecture on sensor network through analysis on the possibility of applying OGC-based services platform.

• Journal of information and communication convergence engineering
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• v.8 no.2
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• pp.219-222
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• 2010

An ubiquitous sensor network (USN) system to monitor the bio information and the emergency of the elderly in the silver town is presented. The USN system consists of the sensor node platforms based on MCU of Atmage128L and RF Chip of CC2420 satisfying IEEE 802.15.4, which includes the bios sensor module such as the electrocardiogram (ECG) sensor and the temperature sensor. Additionally, when an emergency of the elderly is occurred in the silver town, the routing algorithm suitable to find and inform the location of the elderly is proposed, and the proposed routing algorithm is applied to the USN. To collect and manage the ECG data at the PC connected to the sink node, LabView software is used. The bio information and the emergency of the elderly can also be monitored at the client PC by TCP/IP networks in the USN system.