Mohammad Mehdi Shirmohammadi, Ph.D Assistant Professor of Computer Engineering Dept, Islamic Azad University, Hamedan Branch, Hamedan. Mohammad Mehdi Shirmohammadi received his B.S in Computer Engineering- Software and M.S in Information Technology(computer network) from Islamic Azad University, Qazvin Branch, and he is PhD in Computer Engineering-Software systems in Islamic Azad University, Arak Branch, Arak, Iran. He is currently lecturer at Department of Computer Engineering, Islamic Azad University, Hamedan Branch, Iran. His main research interest is Wireless Sensor networks, network security, E-city, multimedia system and decision systems. Mohammad Mahdi Shirmohammadi has more than 100 articles, research projects in academic journals and conferences, and patents.