Current Issue : April - June Volume : 2012 Issue Number : 2 Articles : 4 Articles
A novel empirical path-loss model for wireless indoor short-range office environment at 4.3ââ?¬â??7.3 GHz band is presented. The\r\nmodel is developed based on the experimental datum sampled in 30 office rooms in both line of sight (LOS) and non-LOS (NLOS)\r\nscenarios. The model is characterized as the path loss to distance with a Gaussian random variable X due to the shadow fading\r\nby using linear regression. The path-loss exponent n is fitted by the frequency using power function and modeled as a frequencydependent\r\nGaussian variable as the standard deviation s of X. The presented works should be available for the research of wireless\r\nchannel characteristics under universal indoor short-distance environments in the Internet of Things (IOT)....
The proliferation of wireless networks has been remarkable during the last decade. The license-free nature of the\r\nISM band along with the rapid proliferation of the Wi-Fi-enabled devices, especially the smart phones, has\r\nsubstantially increased the demand for broadband wireless access. However, due to their open nature, wireless\r\nnetworks are susceptible to a number of attacks. In this work, we present anomaly-based intrusion detection\r\nalgorithms for the detection of three types of attacks: (i) attacks performed on the same channel legitimate clients\r\nuse for communication, (ii) attacks on neighbouring channels, and (iii) severe attacks that completely block\r\nnetwork�s operation. Our detection algorithms are based on the cumulative sum change-point technique and they\r\nexecute on a real lightweight prototype based on a limited resource mini-ITX node. The performance evaluation\r\nshows that even with limited hardware resources, the prototype can detect attacks with high detection rates and a\r\nfew false alarms....
The mobile multimedia enabled a lot of applications, which includes E-healthcare,\ndistributed data right management, ICT, and mobile TV. Thus the need for an open architecture\nto handle all these types of multimedia in mobile environment is necessity. In this paper we will\npresent a framework for smart multimedia mobile applications based on agents. The purpose of\nthis framework is to assist mobile multimedia applications to run seamlessly, smartly and to\nadapt it-self based on various changeable environment variables such as location, context, device\nand network parameters. The framework consists of several components such as Mobile\nmultimedia application, Multimedia service proxy, Multimedia service provider, Broker,\nMultimedia server and User profile to achieve framework target....
The use of certain applications for touch-based mobile devices can prove to be\r\ndifficult for intellectually challenged people. By performing tests and gathering user\r\nfeedback, great difficulty has been detected in the use of various applications due to\r\ntheir complicated interfaces.\r\nThe authors propose a set of guidelines, aimed at developers, to help design more\r\naccessible interfaces when developing applications for intellectually challenged, so\r\nthis might increase the overall ease of use of mobile devices....
Loading....