Modeling and simulation of jamming attacks in WLAN

Wireless local area networks (WLAN) are one of the most widely used technologies in our daily lives. Instead of being limited to the range of wired equipment, users can communicate freely. However, since wireless networks are based on communication within radio channels, WLANs are susceptible to malicious attempts to block the channel. One of the most frequently used attacks is a Denial of Service (DoS) attack known as a jamming attack. Jamming attacks interfere with the transmission channels by constantly sending useless packets in order to disturb the communication between legitimate nodes. In real wireless networks where users communicate constantly, a jamming attack can cause serious problems. Because of this, a study of jamming attacks and how to prevent them is necessary. In this thesis, the jamming attacks were simulated in WLAN using OPNET Modeler, in order to provide a better understanding of jamming attacks. This study will be helpful for future research and development of a practical, effective way to avoid jamming attacks. The objectives of this thesis were to simulate client-server and ad-hoc networks and different jammers; launch jamming attacks in order to test how much influence different jammers have in WLAN communications; and to compare the performances of different ad-hoc routing protocols.  M.S

Recent Developments in Smart Healthcare

Medicine is undergoing a sector-wide transformation thanks to the advances in computing and networking technologies. Healthcare is changing from reactive and hospital-centered to preventive and personalized, from disease focused to well-being centered. In essence, the healthcare systems, as well as fundamental medicine research, are becoming smarter. We anticipate significant improvements in areas ranging from molecular genomics and proteomics to decision support for healthcare professionals through big data analytics, to support behavior changes through technology-enabled self-management, and social and motivational support. Furthermore, with smart technologies, healthcare delivery could also be made more efficient, higher quality, and lower cost. In this special issue, we received a total 45 submissions and accepted 19 outstanding papers that roughly span across several interesting topics on smart healthcare, including public health, health information technology (Health IT), and smart medicine