• International Journal of Contents
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• 제7권4호
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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.

• 한국통신학회논문지
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• 제33권4B호
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• pp.174-183
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• 2008

본 논문은 유비쿼터스 센서 네트워크(USN)를 위한 관리 프레임워크(SNMF)를 설계하고 구현한다. SNMF는 센서 네트워크의 자동적인 관리와 에너지 효율적인 관리를 위하여 정책 기반 관리(PBM) 기법을 사용한다. SNMF는 PBM 기법을 적용하기 위하여 경량의 정책 분배 프로토콜인 TinyCOPS-PR 프로토콜을 설계하고, 하위 수준 정책을 표현하는 USN PIB를 정의하였다. 이로써 관리자에 의해 정의된 추상적인 상위 수준 정책은 구체적인 하위 수준 정책으로 변환되어 센서 노드에 적용됨으로써 원하는 관리 행위를 성취하게 된다. 관리자로부터 정책을 수신한 센서 노드는 자신의 지역 정책에 따라 지역적인 관리 행위를 수행함으로써 적은 에너지 소비로 인해 전체적인 네트워크의 생존성을 향상시킬 수 있으며, 관리자의 개입을 최소화함으로써 자동적인 네트워크 관리를 실현할 수 있다.

• ETRI Journal
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• 제30권4호
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• pp.516-525
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• 2008

This paper proposes a compact, energy-efficient, and smart gas sensor platform technology for ubiquitous sensor network (USN) applications. The compact design of the platform is realized by employing silicon-on-insulator (SOI) technology. The sensing element is fully integrated with SOI CMOS circuits for signal processing and communication. Also, the micro-hotplate operates at high temperatures with extremely low power consumption, which is important for USN applications. ZnO nanowires are synthesized onto the micro-hotplate by a simple hydrothermal process and are patterned by a lift-off to form the gas sensor. The sensor was operated at $200^{\circ}C$ and showed a good response to 100 ppb $NO_2$ gas.

• 한국주거학회논문집
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• 제18권5호
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• pp.133-141
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• 2007

The purpose of this study is to secure an evacuation time and to ensure safety by using an Ubiquitous Sensor Network computing when a fire breaks out at a super high-rise apartment housing. A super high-rise apartment housing that is a type of building to solve the problem of separation of the urban function and the phenomenon of hollowing out downtown has been on the increase, high-rise apartment housings occupying 52.7% of whole housings in 2005. However, if a fire breaks out, there would be serious damage since it accommodates many people and facilities as existence of vertical gigantism in the city. The architectural law in force has no clause on it which is universally applicable to general building, it is difficult to be applicable to a densely super high-rise apartment housing and there would be in danger of a resident's evacuation in the fire. Therefore, as a previous study to introduce an USN-based fire-warning facility and evacuation equipment, this study shows the improvement way after analyzing factors that are barriers to evacuaee's behavior of a super high-rise apartment housing and also shows establishment of the grade of vertical evacuation rank by SimuleX, one of the best computer simulation program.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.754-756
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• 2005

전파식별(RFID: Radio Frequency Identification)은 RFID Tag에 내장된 정보를 무선주파수를 이용하여 비접촉식으로 읽어내는 기술로 USN(Ubiquitous Sensor Network)의 핵심 기반 기술로 인식되고 있다. 유통${\cdot}$물류를 중심으로 표준화가 진행되어 온 RFID는 이동통신망이나 네트워크와 연계되어 새로운 표준화가 진행될 움직임을 보이고 있다. 최근 국내에서는 휴대폰에 RFID Reader를 탑재하여 다양한 네트워크 서비스를 제공하는 모바일 RFID에 대한 표준화가 활발하게 진행 중에 있다. 본 논문에서는 ISO/IEC JTC1과 EPCglobal 중심의 유통${\cdot}$물류 분야의 표준화 동향 및 국내 모바일 RFID표준화 동향을 분석하고, 향후 IPv6와 RFID의 연계 방향을 제시한다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.517-520
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• 2013

In construction operation, the temporary structure is used to support designed facilities or to provide work spaces for construction activities. Since the structure is used only during the construction operation, the operation may be given insufficient attention. The contractor is likely to try to save cost on the material and labor cost. This contractor's behavior frequently leads to construction accidents. In order to prevent accidents from the failure, the operation should be carefully monitored for identifying the effect of dynamics in the surrounding site area. Otherwise, any unexpected adversary effect could result in a very costly construction failure. This study presents the feasibility of the ubiquitous sensor network (USN) technology in collecting construction data during the construction operation of earth retaining walls. The study is based on the result at the Construction System Integration Laboratory (CSIL) at the Pusan National University. A USN-based system has been developed for monitoring the behavior of the temporary structure of earth retaining walls. The data collected from the sensors were used to understand the behavior of the temporary structure. The result of this study will be used in increasing the safety during the construction operation of retaining walls.

• 전기학회논문지
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• 제59권7호
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• pp.1302-1308
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• 2010

In this study, Zigbee Sensor Node to transmit harmful gases CO and $CO_2$ information using wireless communication within the ground and underground structures were developed. Wireless communication protocol was used Zigbee Stack included IEEE 802. 15.4 MAC protocol. For wireless transmission of detected harmful gas signal from ADC of MCU was implemented Zigbee Sensor Node that was developed protocol using Serial-Port-Profile(SPP) here. The proposed Zigbee Sensor Node was verified transmission distance from experiments. Transmission distance was into 90m in experiments. Distance experiments were measured at 10m intervals using sine & pulse wave input signal at indoors. The proposed Route Sensor Node was applied mesh routing protocol. When built up USN(Ubiquitous Sensor Network)using Route Sensor Node, transmission distance was not limited. On the experimental results, harmful gas values between direct measurements and USN measurements were consistent. The semiconductor CO sensor and N-DIR $CO_2$ sensor module as a harmful sensor was used. Therefore, the proposed Zigbee Sensor Node was verified about reliability and validity to build USN for transmission of harmful gas information.

• Journal of Electrical Engineering and Technology
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• 제4권1호
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• pp.143-148
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• 2009

About 70% of Korea consists of mountainous areas, and during the construction of many roads and railroads, cut slopes are inevitably formed. The rainy season, frost heaving in winter, and thawing in spring can all cause rockfalls and landslides. The failure of these slopes is increasing every year, causing damage to vehicles, personal injury and even death. To protect people and property from such damage, a real-time monitoring system is needed to detect the early stages of slope failures. The GMG placed TRS sensor units in the slopes to monitor them in real-time. But due to its reliance on data lines and power lines, the system is vulnerable to lightning damage. The whole system can be damaged by a single lighting strike. Consequently, for the purposes of this paper we propose the use of the Ubiquitous Sensor Network (USN) which follows the IEEE 802.1.4. By using the USN system we can minimize lightning damage and can monitor the movement of the slopes consistently.

• 정보보호학회지
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• 제15권1호
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• pp.90-97
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• 2005

유비쿼터스 컴퓨팅은 향후 USN(Ubiquitous Sensor Network) 환경에서 구현될 것으로 예상되며, 유비쿼터스 컴퓨팅에서 RFID(Radio Frequency Identification)기술 기반의 응용 서비스들이 가장 먼저 활성화될 분야로 전망된다. RFID 분야에서의 보안은 RFID의 태그로 인한 프라이버시 침해가 가장 큰 문제점으로 인식되고 있으며, 기술적, 법적·제도적으로 개인의 프라이버시를 보장하기 위한 노력들이 진행 중이다. USN에서의 보안은 센서노드의 자원의 제약으로 인해 기존의 전통적인 보안과는 다른 관점에서의 접근이 필요하며, 키분배 및 관리, 안전한 라우팅 방법론, 센서네트워크에 대한 공격에 대한 안전한 네트워크 구축 등이 이슈들이다. 본 논문에서는 RFID와 USN의 보안 연구 대상에 대해서 살펴보고 이들에 대한 향후 연구 방향을 소개한다.

• 정보보호학회지
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• 제18권6호
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• pp.58-69
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• 2008

현재 널리 쓰이고 있는 다양한 형태의 모바일 디바이스들을 무선 센서 네트워크 환경에 접목하여 보다 편리하고 효율적으로 센서 네트워크 서비스를 제공받을 수 있는 모바일 USN(Ubiquitous Sensor Network) 서비스 기술을 소개하고, 그 응용 서비스 모델인 Nike 플러스 i-Pod 스포츠 키트 플랫폼에 대해 살펴본다. 그리고, 해당 서비스의 보안취약성을 분석하여 모바일 USN에서의 보안 및 프라이버시 문제를 제시하고, 향후 제공되어질 다양한 모바일 USN 보안 응용 서비스들에 대해 고찰해본다.