• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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• pp.45-47
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• 2009

Wireless Sensor Network(WSN) has been very popular in unattended surveillance systems recently. For Applying WSN into Building Automation system(BAS), a novel hierarchial network structure and static routing algorithm which eliminates the scalability limitation of Zigbee are proposed in this paper. The static routing algorithm relying on the hierarchial network address reduces the computational complexity to a great extent and has a real-time performance which satisfies urgent applications well.

• 정보보호학회논문지
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• 제16권1호
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• pp.105-114
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• 2006

USN은 모든 사물에 컴퓨팅과 통신기능 및 센싱 기능을 부여하여 언제, 어디서나, 통신이 가능한 환경을 구축하는 네트워크로서, 향후에는 다양한 센싱 기능이 추가되어 이들 간의 네트워크가 구축되는 형태로 발전할 것이다. 따라서 본 논문에서는 무선 센서 네트워크를 무인 경비 시스템에 적용할 경우 나타날 수 있는 정보 보안상의 취약점을 도출하고, 현재 제안된 보안 프로토콜 중에서 SNEP(Secure Network Encryption Protocol)을 사용하여 안전한 무선 센서네트워크를 만들고자 한다. 그러나 SNEP에 사용한 CBC-MAC은 메시지의 길이가 가변일 경우 안전하지 못하기 때문에, 오직 한 개의키를 갖으면서도 임의의 길이 메시지도 안전하게 취급할 수 있는 OMAC(One-Key CBC-MAC)를 SNEP에 적용한 새로운 기법인 OMAC-SNEP을 제안하고, 구현하였다. 따라서 본 OMAC-SNEP 기법은 무인 경비시스템은 물론 기타의 무선 센서 네트워크에서도 널리 활용이 가능할 것이라 생각된다.

• Smart Structures and Systems
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• 제10권3호
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• pp.271-298
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• 2012

Researchers have made significant progress in recent years towards realizing effective structural health monitoring (SHM) utilizing wireless smart sensor networks (WSSNs). These efforts have focused on improving the performance and robustness of such networks to achieve high quality data acquisition and distributed, in-network processing. One of the primary challenges still facing the use of smart sensors for long-term monitoring deployments is their limited power resources. Periodically accessing the sensor nodes to change batteries is not feasible or economical in many deployment cases. While energy harvesting techniques show promise for prolonging unattended network life, low power design and operation are still critically important. This research presents the WiSeMote: a new, fully integrated ultra-low power wireless smart sensor node and a flexible base station, both designed for long-term SHM deployments. The power consumption of the sensor nodes and base station has been minimized through careful hardware selection and the implementation of power-aware network software, without sacrificing flexibility and functionality.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.141-145
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• 2008

Wireless sensor network (WSN) is expected to be used in many applications. However, sensor nodes still have some secure problems to use them in the real applications. They are typically deployed on open, wide, and unattended environments. An adversary using these features can easily compromise the deployed sensor nodes and use compromised sensor nodes to inject fabricated data to the sensor network (false data injection attack). The injected fabricated data drains much energy of them and causes a false alarm. To detect and drop the injected fabricated data, a filtering-based security method and adaptive methods are proposed. The number of different partitions is important to make event report since they can make a correctness event report if the representative node does not receive message authentication codes made by the different partition keys. The proposed methods cannot guarantee the detection power since they do not consider the filtering scheme. We proposed clustering method for filtering-based secure methods. Our proposed method uses fuzzy system to enhance the detection power of a cluster.

• 정보보호학회논문지
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• 제23권3호
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• pp.459-470
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• 2013

${\mu}TESLA$는 WSN(Wireless Sensor Network)에서 대표적인 에너지 효율적 브로드캐스트 인증 방법이다. 지금까지 ${\mu}TESLA$의 문제점을 파악하고 이를 해결한 많은 연구들이 존재하지만, 그들 대부분은 자신들의 성능 입증을 위해 현실과는 거리가 먼 실험 환경에서 검증되었다. 우리는 현실에서 실제 WSN을 사용할 법한 실험 환경을 가정하고 이 바탕 위에서 ${\mu}TESLA$가 가진 실체적인 성능에 대해서 고찰해볼 필요가 있다고 생각하였다. 이 논문에서는 BS가 네트워크에 상주하지 않는 UWSN(Unattended WSN) 환경에서 동면과 활동을 반복하는 센서 노드들이 멀티홉으로 통신을 수행하는 경우를 가정하였다. 이러한 환경에서 우리는 다양한 모의실험을 통하여 ${\mu}TESLA$의 성능을 새로이 검증 및 분석하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권4호
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• pp.805-821
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• 2011

Wireless Sensor Networks (WSNs) are rapidly emerging because of their potential applications available in military and civilian environments. Due to unattended and hostile deployment environments, shared wireless links, and inherent resource constraints, providing high level security services is challenging in WSNs. In this paper, we revisit various security attack models and analyze them by using a well-known standard notation, Unified Modeling Language (UML). We provide a set of UML collaboration diagram and sequence diagrams of attack models witnessed in different network layers: physical, data/link, network, and transport. The proposed UML-based analysis not only can facilitate understanding of attack strategies, but can also provide a deep insight into designing/developing countermeasures in WSNs.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2005년도 한국컴퓨터종합학술대회 논문집 Vol.32 No.1 (A)
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• pp.427-429
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• 2005

Energy efficiency is the most challenging issue in wireless sensor network to prolong the life time of the network, as the sensors has to be unattended. Cluster based communication can reduce the traffic on the network and gives the opportunity to other sensors for periodic sleep and thus save energy. Passive clustering (PC) can perform a significant role to minimize the network load as it is less computational and light weight. First declaration wins method of PC without any priority generates severe collision in the network and forms the clusters very dense with large amount of overlapping region. We have proposed several modifications for the existing passive clustering algorithm to prolong the life time of the network with better cluster formation.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2008년도 한국컴퓨터종합학술대회논문집 Vol.35 No.1 (A)
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• pp.261-262
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• 2008

Due to technological advances, the manufacturing of small and low cost of sensors becomes technically and economically feasible. In recent years, an increasing interest in using Wireless Sensor Network (WSN) in various applications, including large scale environment monitoring, battle field surveillance, security management and location tracking. In these applications, hundreds of sensor nodes are left to be unattended to report monitored data to users. Since sensor nodes are placed randomly and sometimes are deployed in underwater. It is impossible to replace batteries often when batteries run out. Therefore, reducing energy consumption is the most important design consideration for sensor networks.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1189-1190
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• 2008

Wireless sensor networks (WSN) have attracted much attention in recent years due to their potential use in many applications such as border protection and combat field surveillance. Given the criticality of such applications, maintaining a dependable operation of the network is a fundamental objective. However, the resource constrained nature of sensor nodes and the ad-hoc formation of the network, often coupled with an unattended deployment, pose non-conventional challenges and motivate the need for special techniques for dependable design and management of WSN. In this article, we highlight the potential of careful positioning of the base station (BS), which acts as a sink resources.

• 한국통신학회논문지
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• 제39C권3호
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• pp.223-233
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• 2014

무선 센서 네트워크에서 브로드캐스트 인증 방법 중 하나인 ${\mu}$TESLA는 안전한 센서 네트워크의 운영을 위해 BS(base station)로부터 센서 노드로 전달하는 브로드캐스트 메시지의 인증을 가능하게 한다. 하지만 UWSN 환경에서 매우 짧은 키 슬롯 값을 갖는 ${\mu}$TESLA를 사용할 경우, 센서 노드들은 공개된 비밀키 검증을 위하여 많은 양의 해시값을 계산하여야 한다. 반대로, 센서 노드의 해시 연산량을 줄이기 위하여 ${\mu}$TESLA의 키 슬롯 길이를 지나치게 길게 잡는다면, BS는 키를 공개하기 위하여 그 지나치게 긴 슬롯 길이만큼의 시간을 기다려야 한다. 이 논문에서는 이러한 점을 개선하기 위하여 가변 길이의 키 슬롯을 갖는 ${\mu}$TESLA에 대하여 제안하였으며, 이를 모의 실험한 결과를 보임으로써, 우리의 기법이 센서 노드의 응답 시간을 향상시키고 센서 노드에서 수행되는 해시 연산의 수를 효과적으로 줄였음을 증명한다.