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With the great improvement of operational speed of trains, the on-board ATP of the high-speed railway plays an essential role in train's safe operation as a major component of the signal system. Therefore, it is necessary and important to identify and assess risks in the on-board ATP. In this paper, a quantitative risk assessment method is proposed based on the Bow-tie model. Event trees are exploited...
This paper addresses the problem of joint optimization of subchannel selection and spectrum sensing time for multiband cognitive radio networks. In particular, we construct a multiband spectrum sensing framework, and derive the probabilities of detection and false alarm taking the different subchannel gain into account. Furthermore, we formulate the multiband sensing as a two-parameter optimization...
Recent work has demonstrated that the underutilized spectrum in the Digital Television Bands, commonly referred to as TV White Space (TVWS), is a prime candidate for opportunistic spectrum access (OSA). However, a systematic assessment of the availability of this spectrum for secondary transmission was, until very recently, lacking. In a TVWS opportunity prediction model to estimate indoor secondary...
As Web forum has become an enormous collection of highly valuable opinions and commentaries, more and more researchers express strong interests on it. However, most of them pay attention to the forum reviews rather than the posts themselves. In this paper we focus on recognizing the diversified opinions of different threads on the same topic from Chinese Web forums. First, we congregate the Web forum...
Markov prediction model is the basis of Web prefetching and personalized recommendation. The existence of a large amount of Web objects results in a vast increase in the number of states which represent the users visited transfer behavior, which also causes the problem of huge spatial complexity in prediction model. In view of the transition probability matrix in Markov prediction model, this paper...
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