• 한국인터넷방송통신학회논문지
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• 제12권4호
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• pp.141-145
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• 2012

유비쿼터스 센서 네트워크에서 센서노드는 일반적으로 크기가 소형이고 저가이며 배터리로 운용되므로 전력이 부족한 특징이 있다. 이런 센서 노드 환경에서 신뢰도가 높은 TCP/IP 프로토콜을 적용하여 센싱된 데이터를 전송하는 경우에 센서 노드에 내장된 메모리 크기의 제약을 극복하는 기술이 제안되었으나 오류가 발생하는 경우에 적용이 어려운 문제가 있었다. 본 논문에서는 이 문제를 극복하기 위해 프레임 오류나 손실 시에 처리하는 알고리즘이 제안되었으며, 주기적으로 센싱 데이터를 전송하는 일반적인 경우에 적용이 가능하다.

• 한국멀티미디어학회논문지
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• 제18권10호
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• pp.1225-1230
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• 2015

Mobile Sensor Networks (MSN) is composed of a distributed collection of mobile sensor nodes, each of which has sensing, computation, communication and locomotion capabilities. Since the routing path can be broken when some nodes on the path move to other position, MSN may have a high rate of communication failure. So, MSN has to provide a means for low-cost and low-power routing to support mobility of sensor nodes. In this paper, a limited flooding scheme for routing in MSN is proposed to allow efficient energy utilization without requiring any complicated tasks for path maintenance.

• ETRI Journal
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• 제30권3호
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• pp.483-485
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• 2008

A micro-sensor network is comprised of a large number of small sensors with limited memory capacity. Current key-establishment schemes for symmetric encryption require too much memory for micro-sensor networks on a large scale. In this paper, we propose a memory-efficient hypercube key establishment scheme that only requires logarithmic memory overhead.

• 한국IT서비스학회지
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• 제6권1호
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• pp.141-149
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• 2007

Sensor node's mobility brings new challenges to data dissemination in large sensor networks. Frequent location updates of sensor nodes can lead to both excessive drain of sensor's limited battery supply and increased collisions in wireless transmissions. Conventional studies for routing protocols in wireless sensor networks are not enough to cover energy consumption and migration of sensor nodes. This study proposes a dynamic routing protocol based on the SPIN considering energy consumption and the migration, and also shows the effectiveness of the proposed routing protocol.

• 한국멀티미디어학회논문지
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• 제13권1호
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• pp.10-16
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• 2010

최근 유비쿼터스 컴퓨팅 환경에 관한 연구가 활발하게 이루어지고 있으며, 특히 센서 네트워크 기술은 유비쿼터스 컴퓨팅 환경의 핵심 기술이다. 무선 센서 네트워크는 주변의 관심 데이터를 감지하고 수집하기 위해서 물리적 공간에 배치된 센서 노드들로 구성된다. 센서 네트워크를 구성하는 각 센서 노드는 제한된 자원을 아용하여 필요한 서비스를 수행할 수 있어야 한다. 또한 무선 센서 네트워크를 구축함에 있어서 제한된 자원을 이용하는 센서 노드의 에너지 소비를 효율성 있게 사용해야만 전체 네트워크의 수명을 연장할 수 있다. 본 논문에서는 효율적으로 에너지를 사용하여 특정 지역의 환경 데이터를 수집하고 전송하여 원격지에서 컴퓨터를 통해 실시간으로 변화되는 환경 정보를 모니터링할 수 있는 시스템을 구축한다.

• 한국지능시스템학회논문지
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• 제15권5호
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• pp.615-620
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• 2005

Sensor networks are usually composed of tens or thousands of tiny devices with limited resources. Because of their limited resources, there will often be some faulty nodes within the network. As nodes in some certain regions rely on each other to route the information gathered by different sensors to a base station (sink), the network should be able to detect a non-operational node in order to determine new paths for routing the information. Failure detection, which identifies the faulty nodes, is rather necessary in sensor networks and a very important research issue. The detection of a non-operational node can be performed using Consensus Algorithm with the purpose of achieving agreement about a node which is supposed to be faulty (non-operational). In this work, we discuss the application of a Consensus Algorithm to sensor node called 'mote'. Our experimental results show that it works efficiently for identifying faulty nodes in sensor networks.

• Journal of information and communication convergence engineering
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• 제7권4호
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• pp.525-529
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• 2009

On the limited urban area meteorological data are hard to be collected because of the cost problem. The facilities collecting the data require high installment cost. Recently, the sensor network technique comes to the fore as a solution. Furthermore a mobile phone also becomes to be recognized as a sensor. This paper studies an application to service the meteorological map using mobile phone sensor. A design results for system implementation are introduced in this paper.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.135-139
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• 2003

Sensor networks consist of sensor nodes with small-size, low-cost, low-power, and multi-functions to sense, to process and to communicate. Minimizing power consumption of sensors is an important issue in sensor networks due to limited power in sensor networks. Clustering is an efficient way to reduce data flow in sensor networks and to maintain less routing information. In this paper, we propose a multi-hop clustering mechanism using global and local ID to reduce transmission power consumption and an efficient routing method for improved data fusion and transmission.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.1201-1211
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• 2015

WSN acts as an effective tool for tracking the large scale environments. In such environment, the battery life of the sensor networks is limited due to collection of the data, usage of sensing, computation and communication. To resolve this, a mobile robot is presented to identify the data present in the partitioned sensor networks and passed onto the sink. In novel data collection algorithm, the performance of the data collecting operation is reduced because mobile robot can be used only within the limited range. To enhance the data collection in a changing environment, Non Linear Error Identifier (NLEI) algorithm has been developed and presented in this paper to configure the robot by means of error models which are non-linear. Experimental evaluation has been conducted to estimate the performance of the proposed NLEI and it has been observed that the proposed NLEI algorithm increases the error correction rate upto 42% and efficiency upto 60%.

• Journal of Communications and Networks
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• 제15권4호
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• pp.422-429
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• 2013

Advances in wireless sensor network (WSN) technology have enabled small and low-cost sensors with the capability of sensing various types of physical and environmental conditions, data processing, and wireless communication. In the WSN, the sensor nodes have a limited transmission range and their processing and storage capabilities as well as their energy resources are limited. A triple umpiring system has already been proved for its better performance in WSNs. The clustering technique is effective in prolonging the lifetime of the WSN. In this study, we have modified the ad-hoc on demand distance vector routing by incorporating signal-to-noise ratio (SNR) based dynamic clustering. The proposed scheme, which is an efficient and secure routing protocol for wireless sensor networks through SNR-based dynamic clustering (ESRPSDC) mechanisms, can partition the nodes into clusters and select the cluster head (CH) among the nodes based on the energy, and non CH nodes join with a specific CH based on the SNR values. Error recovery has been implemented during the inter-cluster routing in order to avoid end-to-end error recovery. Security has been achieved by isolating the malicious nodes using sink-based routing pattern analysis. Extensive investigation studies using a global mobile simulator have shown that this hybrid ESRP significantly improves the energy efficiency and packet reception rate as compared with the SNR unaware routing algorithms such as the low energy aware adaptive clustering hierarchy and power efficient gathering in sensor information systems.