Sensor Systems, vol. 4, no. 1, pp. 9–16, 2014.26[20] D. C. Hoang, P. Yadav, R. Kumar, and S. K. Panda, “Real-time implementation of a harmony search algorithm-based clustering protocol forenergy-efficient wireless sensor networks,†IEEE Transactions on Industrial Informatics, vol. 10, no. 1, pp. 774–783, 2014.[21] P. Kuila and P. K. Jana, “Energy efficient clustering and routing algorithms for wireless sensor networks: Particle swarm optimization approach,†Engineering Applications of Artificial Intelligence, vol. 33, pp.127–140, 2014.[22] N. Javaid, T. Qureshi, A. Khan, A. Iqbal, E. Akhtar, and M. Ishfaq, “Eddeec: enhanced developed distributed energy-efficient clustering for heterogeneous wireless sensor networks,†Procedia computer science, vol. 19,pp. 914–919, 2013.[23] P. Zhang, G. Xiao, and H.-P. Tan, “Clustering algorithms for maximizing the lifetime of wireless sensor networks with energy-harvestingsensors,†Computer Networks, vol. 57, no. 14, pp. 2689–2704, Oct. 2013.[24] N. A. Pantazis, S. A. Nikolidakis, and D. D. Vergados, “Energy-efficientrouting protocols in wireless sensor networks: A survey,†IEEE Communications Surveys & Tutorials, vol. 15, no. 2, pp. 551–591, 2013.[25] P. Huang, L. Xiao, S. Soltani, M. W. Mutka, and N. Xi, “The evolution of mac protocols in wireless sensor networks: A survey,†IEEE