With the rapid development of wireless networking technologies, the Internet of Things and heterogeneous cellular networks (HCNs) tend to be integrated to form a promising wireless network paradigm for 5G. Hyper-dense sensor and mobile devices will be deployed under the coverage of heterogeneous cells, so that each of them could freely select any available cell covering it and compete for resou...

When earthquakes occur, structures sustain damages. But it is impossible to estimate damages exactly which occur in the structures because of the uncertainty of materials and ground motions. Therefore, probabilistic methods for estimating damages of the structures have been suggested lately. In this study, probabilistic capacity spectrum method expanding established capacity spectrum method is ...

A fundamental assumption in our understanding of disks is that when the Toomre parameter Q 1, the disk is stable against fragmentation into smaller, self-gravitating objects (and so cannot, for example, form planets via direct collapse). However, if disks are turbulent, this criterion neglects a broad spectrum of stochastic density fluctuations that can produce rare but extremely high-density l...

Consider a multimedia input traac stream, described by a stationary random process. Our previous study indicates that second-order input statistics, which are described by power spectrum in the frequency domain, play a dominant role in queueing performance as compared with higher-order input statistics. In this paper we show the signiicant eeect of input power spectrum on link capacity allocati...

Since 2000, cognitive radio has slowly been moving from theory into reality. One major driving force for that is tangible commercial applications for cognitive radio, the most major of which is dynamic spectrum access (DSA). A wide variety of DSA techniques have been proposed, in an effort to take advantage of every ounce of unused spectrum. This paper analyzes the three main approaches: freque...

The average channel capacity (in the Shannon sense) per user of a hybrid cellular directsequence/fast frequency hopping code-division multipleaccess (DS/FFH-CDMA) system operating in a Rayleigh fading environment is examined. The analysis covers the downlink of a cellular system assuming a static model of operation and leads to a novel expression for the average channel capacity available to ea...

Cities in the developing world are facing outstanding economic and human losses caused by natural hazards such as earthquakes, amount of is affected quality preventive measures emergency management. For this reason, seismic vulnerability assessment considered a crucial part strategy for risk mitigation improving resiliency cities. Due to high number building archetypes at large scale, fast, sim...

The technique of embedding a digital signal into an audio recording or image using techniques that render the signal imperceptible has received significant attention. Embedding an imperceptible, cryptographically secure signal, or watermark, is seen as a potential mechanism that may be used to prove ownership or detect tampering. While there has been a considerable amount of attention devoted t...

In this paper, a constant total system’s allocated bandwidth hybrid direct-sequence/fast frequency hopping code-division multiple-access (DS/FFH-CDMA) cellular system, when operating in a Rayleigh fading environment, is examined. The described analysis leads to a novel-closed form expression for the probability density function (pdf) of the channel capacity per user, which relates the pdf of th...