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A New Energy-Efficient and Reliable Protocol for Stochastic WSNs Based on back-pressure and Entropy of Residual Energy

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Journal of Computer and Communications 2020年第11期8卷 1-13页

作者： Mohammed Almazaideh Janos Levendovszky Budapest University of Technology and Economics Budapest Hungary

In this paper, a new energy-efficient and reliable routing protocol is introduced for WSNs including a stochastic traffic generation model and a wakeup/sleep mechanism. Our objective is to improve the longevity of the WSNs by energy balancing but providing reliable packet transfer to the Base Station at the same time. The proposed protocol is based on the principle of the back-pressure method and besides the difference of backlogs, in order to optimize energy consumption, we use a cost function related to an entropy like function defined over the residual energies of the nodes. In the case of two-hop routing the optimal relay node is selected as the one which has maximum backlog difference and keeps the distribution of residual energy as close to uniform as possible where the uniformity is measured by the change of the entropy of the residual energy of the nodes. The protocol assumes Rayleigh fading model. Simulation results show that the proposed algorithm significantly improves the performance of traditional back-pressure protocol with respect to energy efficiency, E2E delay and throughput, respectively.

关键词： WSN back-pressure Routing Protocols Entropy of Residual Energy Energy Efficiency

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Review of Infrared signature suppression systems using optical blocking method

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Defence Technology（防务技术） 2019年第3期15卷 432-439页

作者： Nidhi Baranwal Shripad P. Mahulikar Department of Aerospace Engineering Indian Institute of Technology Bombay Mumbai 400076 India Institute Aerospace Engineering

With rapid advancements in Infra-Red (IR) detection techniques, the range from where the IR-guided missiles are able to lock the target aircraft has increased. To avoid the detection and tracking by modern IR-guided missiles, the aircraft and helicopters also demand progress in its stealth techniques. Hence, study of Infra-Red Signature Suppression (IRSS) systems in aircraft and helicopters has become vital even in design stage. Optical blocking (masking) is one of the effective IRSS techniques used to block the Line- Of-Sight (LOS) of the hot engine parts of the exhaust geometry. This paper reviews the various patents on IR signature suppression systems based on the optical blocking method or a combination of IRSS techniques. The performance penalties generated due to installation of various IRSS methods in aircraft and helicopters are also discussed.

关键词： IR signature suppression Optical blocking Performance penalty IR signature level Engine back-pressure

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