• Convergence Security Journal
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• v.11 no.3
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• pp.39-46
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• 2011

Smart environment of health information technology, u-Healthcare architecture, ad-hoc networking and wireless communications environment are major factors that increase vulnerability of u-healthcare information systems. Traffic domain is the concept of network route that identifies the u-Healthcare information systems area as the traffic passing and security technologies application. The criterion of division is an area requiring the application of security technology. u-Healthcare information system domains are derived from the intranet section. the public switched network infrastructure, and networking sectors. Domains of health information systems are separated by domain vulnerability reason. In this study, domain-specific security vulnerability assessment system based on the USN in u-Healthcare system is derived. The model used in this study suggests how to establish more effective measurement USN-based health information network security vulnerability which has been vague until now.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.28 no.9
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• pp.55-64
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• 2010

• TTA Journal
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• s.95
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• pp.70-77
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• 2004

자동화되고 손쉽게 정보를 얻을 수 있는 RFID/USN 환경에서는 보안에 심각한 위협을 가져오며, 반대로 RFID 등의 제약된 자원에 의해 기존 정보보호 기법을 그대로 사용하기 어렵게 된다. 따라서 새로운 경량화 정보보호 기법이 연구되고 있으며, 또한 QoSS(Quality of Security Service)를 통해 제약된 자원의 활용도를 최대화 시키고자 하는 연구가 진행 중이다. 본고에서는 이러한 연구 동향에 대해 소개한다.

• International Journal of Contents
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• v.7 no.4
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• pp.35-43
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• 2011

USN is a technology to detect human external environment. It is an important factor in buildinga ubiquitous computing environment. In this thesis, an authentication method was proposed to allow the sensor nodes, which have weak computing operation capability, to safely communicate with each other in USN and guarantee the anonymity of users for their privacy. In the proposed authentication method that takes into account the characteristics of sensor network, sensor nodes based on a symmetric key algorithm do not transfer keys directly, instead, they mix the random numbers received from AS to generate keys necessary for communications, having a master key and a pseudo-random number generator.In addition, in this thesis, TA was adopted to minimize the leakage of users' information, and a scheme through which virtual IDs received from AS are delivered to sensor nodes was applied to improve anonymity.

• Journal of Information Technology Services
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• v.8 no.4
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• pp.215-223
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• 2009

The workplace environment monitoring system based on IP-USN proposed in this study measures and analyzes workplace environment information so as to provide services to provide better work environment and prevent occupational accidents caused by poor, shabby labor environment. This study presents the procedures to design and develop a system that monitors noise, humidity, vibration, temperature, and sensors installed in the workplace and sounds alarm when workers enter dangerous areas or are exposed to hazards. The author actually installed the IP-USN workplace environment monitoring system in a small workplace and confirmed its effectiveness.

• Electronics and Telecommunications Trends
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• v.26 no.6
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• pp.97-107
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• 2011

2000년대 이후 전 세계적으로 곡물 재고율 하락이 장기화되고, 인구증가 및 생활 여건의 개선에 따라 식량부족 상태의 심화가 예측됨에 따라 세계 각국은 곡물의 생산성 제고 및 품질향상 방안을 확보하고자 노력하고 있다. 농업 IT 융합기술은 기존의 농업기술에 IT 고유기술을 농업에 융합시켜 농업의 생산 유통 소비 전 과정에 걸쳐 생산성과 효율성 및 품질향상 등과 같은 고부가가치 창출을 추구하고자 하는 기술이다. 크게 보면 축산업 분야도 포함되는 것이지만 여기에서는 재배 작물의 생산에 국한하고, IT 기술 중에서 USN 기술을 적용한 USN 기반의 IT 기술을 농업에 융합하는 분야로 한정한 기술의 연구 동향을 고찰하고자 한다. 노지 작물과 시설원예 작물 및 외부 환경에 영향을 받지 않는 새로운 개념인 식물공장에 IT 기술을 적용하기 위하여 필요한 사항을 고찰하고, 국내외 기술개발 및 표준화 동향과 향후 추진되어야 할 기술적 이슈들을 제시하였다.

• Journal of Sensor Science and Technology
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• v.17 no.1
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• pp.53-60
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• 2008

Localization is the most important functions in mobile robots. There are so many approaches to realize this essential function in wheel based mobile robots, but it is not easy to find similar examples in small underwater robots. It is presented the sonar localization system using ubiquitous sensor network for a fish robot in this paper. A fish robot uses GPS and sonar system to find exact localization. Although GPS is essential tool to obtain positional information, this device doesn't provide reasonable resolution in localization. To obtain more precise localization information, we use several Ubiquitous Sensor Networks (USN) motes with sonar system. Experimental results show that a fish robot obtains more detailed positional information.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.948-951
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• 2008

Ubiquitous sensor network (USN) based on ZigBee communication protocol has been used in various application fields, such as home-network, intelligent building and machine, logistics, environmental monitoring, military field, security field and etc. The ZigBee is targeted at radio-frequency application that require a low data rate, long battery life and secure network. Especially, the USN system can be applied efficiently to building-indoor where the complex geometry is adopted. In this study, all 90 points of railway cabin indoor were monitored for temperature and humidity using USN technology. All sensors were pre/post-calibrated and the temperature/humidity change were analyzed in a railway cabin in real-time. The results would be useful to develop the cabin heating, ventilating and air conditing (HVAC) system to meet all passengers' thermal comfort regardless of their seat position.

• Journal of Sensor Science and Technology
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• v.19 no.3
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• pp.230-237
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• 2010

In sensor signal conditioning and processing, offset and drift characteristics of an operational amplifier are an important factor when the amplifier is used for a precise sensor signal amplifier. In order to use it in high accuracy, an expensive trimming or a complex compensation circuit is required. This paper presents the improved sensor signal conditioning and processing device for ubiquitous sensor network(USN) application or general purpose by developing a hardware of the circuit for reducing the offset voltage and drift characteristics, and a software for its control and sensor signal processing. We realize better offset voltage and drift characteristics of the signal conditioning circuit using low cost operational amplifiers. The experimental results show that this technique is effective in improving the performance of the sensor signal processing device.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2006.11a
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• pp.69-72
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• 2006

급격한 정보화 산업의 발달로 인하여 혁신적인 기술 진화와 함께 이에 기반한 새로운 환경적, 기술적 패러다임이 변화되고 있다. 공간 간 융합과 조화를 극대화 시키고 공간속에서의 충돌과 문제점을 최소화시키기 위한 유비쿼터스 공간의 출현이다. USN에서 많은 수의 작고 다양하고 이질적인 센서 데이터 들이 발생하고 있다. 센서 데이터베이스 시스템에서 수많은 데이터들을 융합하기 위하여 에이전트 기술을 이용하고, 방대하고 애매모호한 데이터를 퍼지이론을 적용하여 데이터를 분류하여 적절한 장소에서 사용자의 욕구에 알맞은 정보를 제공함으로써 효율성과 융통성을 지원하는 방법을 제안한다. 본 논문에서는 이러한 애매모호한 데이터를 적절하게 분류함으로써 시간과 비용을 절약하고 빠른 응답을 사용자에게 전달할 수 있으며 유효적절한 서비스를 사용자의 기호에 맞게 제공함으로써 공간과 사물에 주어진 센서 데이터를 효율적으로 관리 할 수 있는 방법을 제안한다.