Dr. Fei Hu is currently an associate professor in the Department of Electrical and Computer Engineering at the University of Alabama, Tuscaloosa, USA. He obtained his Ph.D. degrees at Tongji University (Shanghai, China) in the field of signal processing (in 1999) and at Clarkson University (New York, USA) in the field of electrical and computer engineering (in 2002). He has published over 160 journal/conference papers and books. Dr. Hu's research has been supported by the US National Science Foundation, Cisco, Sprint, and other sources. His research expertise can be summarized as 3S: Security, Signals, Sensors: Security, which focuses on how to overcome different cyber attacks in a complex wireless or wired network. Recently, he focused on cyber-physical system security and medical security issues. Signals, which mainly refers to intelligent signal processing, that is, using machine learning algorithms to process sensing signals in a smart way in order to extract patterns (i.e., achieve pattern recognition). Sensors, which includes microsensor design and wireless sensor networking issues.