Latest Articles in the Journal of WSN (JWSN)

An Energy Efficient Evo-Fuzzy Sleep Scheduling

Protocol for Stationary Target Coverage in Wireless Sensor Networks

Srinjoy Ganguly

Target coverage is a fundamental problem that needs to be addressed in sensor networks for a variety of applications such as environment monitoring and surveillance purposes. A typical approach to prolong network lifetime would entail the partitioning of the sensors capable of sensing the targets, in a network for target monitoring into several disjoint subsets such that each subset can cover all the targets. Thus, each time only the sensors in one of such subsets are activated. In this paper, we have proposed a novel sleep scheduling protocol, abbreviated as EEFSSP, based on this concept which incorporates three novel features. Firstly, it paves way for an equitable distribution of nodes while forming cover sets through the proposed CSGH heuristic. Secondly, it schedules the cover sets using an evolutionary approach with the objective being to optimize the maximum breach interval. Thirdly, the EEFSSP introduces a novel routing protocol abbreviated as DFPRP to establish routes to transfer data packets to the Base Station, with the objective being to ensure energy-efficiency and minimize the number of packet drops. We finally conduct experiments by simulation to evaluate the performance of the proposed scheme under various conditions, and compare its performance with other relevant protocols. The experimental results show that the proposed scheme clearly outperforms its peers by delivering a much longer network lifetime and minimizing the number of packet drops.

Secure Clustering Protocols in Wireless Sensor Networks

Santar Pal Singh,  S. C. Sharma

Wireless sensor networks (WSNs) are poised of huge number of low-cost and tiny devices i.e. senor nodes which communicate over wireless media. Various WSN based projects produced fruitful and interesting results that greatly improves our life. Due to several limitations on the resources of sensor nodes, the networks exposed against different types of attacks. Hence, security in sensor networks is a prime issue and becomes hot topic for researchers. In this paper, we have been reported a detailed analysis on secure cluster-based routing protocols in WSNs. Finally, we propose a matrix which generalizes the work and suggest the protocol suitability for particular application.



Okeke Benjamin Chukwuejekwu, Lazarus Okechukwu Uzoechi, James Agajo, Okpe Godwin,  Kabis salisu Danja

Analysis and estimation of the time of  arrival and received signal strength  for indoor geolocation using MATLAB describes an indoor geolocation localization  which either  use the received signal strength (RSS) or time of arrival (TOA) of the received signal as their localization  metric. Though time of arrival based systems are sensitive to the available bandwidth and also to the occurrence of undetected direct path (UDP) channel conditions which RSS based system are less sensitive to the bandwidth as more resilient to undetected conditions.  This paper demonstrate the availability of radio channel modeling techniques to eliminate the costly finger printing process in pattern recognition algorithms by introducing ray tracing (RT) assisted  by RSS and TOA based algorithms. The results shows the effect of pathloss on signal reception, showing free path loss reduces when plotted with the height of the building which can be used for achieving localization. It was also discovered that path loss also contributes to signal delay and the RSS at fixed positions can be used to determine geolocation.


James Agajo, Nuhu Bello K, Faith Ntekim, Okeke Benjamin  Chukwuejekwu,  Lazarus Okechukwu Uzoechi

Many health monitoring systems exist due to the fact that health monitoring is paramount as it is useful to indicate life in the human body. Despite the many systems that exist, life is still being threatened as low sensitivity and accuracy devices are still being used. Also, many health institutions in developing countries like Nigeria are still faced with the challenge of remotely monitoring unstable and critical patients. This project describes the design and implementation of a human pulse rate and temperature monitoring device based on zigbee technology. It presents the use of high sensitivity and accuracy devices such as the thermistor for temperature monitoring and the use of disposable ECG electrodes for pulse rate monitoring. The system consists basically of the transmitting and the receiving units. Zigbee technology is used for wireless transmission and results are displayed via a Liquid Crystal Display (LCD). Subsequently, as a means to measure performance, three samples collected from available results were used and compared with the results obtained from project. The results show 87.2%, 89.5% and 88.1% accuracy for temperature measurement and 98.39%, 97.23% and 98.58% accuracy in pulse rate measurement for the three samples. The device remotely measures human temperature and pulse in real time and can be used in especially small scale hospitals and clinical environments. The device is also user friendly and cost effective.

Journal of Wireless Sensor Network (JWSN)