Wireless Sensor Networks: A Survey. Clustering Techniques. Security in Wsns. Wsns Routing Protocols. A Distributed and Safe Weighted Clustering Algorithm. Results and Discussion.

Amine Dahane, PhD, is affiliated with the Intelligent Systems Research Laboratory, University of Sciences and Technology of Oran, Algeria. His

main research interests include wireless sensor networks, their security, routing and management, intrusion detection, and MAC protocols design issues. He is a reviewer of several journals and participates regularly at professional conferences. He received his Master's degree in Computer Systems and Networks from the University of Bechar and his PhD degree in Electronics from the University of Sciences and Technology of Oran (USTO, Algeria).

Nasr-Eddine Berrached, PhD, is a professor in the Electronics Department at University of Science and Technology of Oran, Algeria. Previously he headed the laboratory of robotics and the research laboratory in intelligent systems (LARESI). His interests include man-machine interface, telerobotics, machine vision, pattern recognition and inverse problem. He received his doctor of engineering in computer science degree from the Tokyo Institute of Technology (TIT, Japan).