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Threaded debate forums have become one of the major social media platforms. Usually people argue with one another using not only claims and evidences about the topic under discussion but also language used to organize them, which we refer to as shell. In this paper, we study how to separate shell from topical contents using unsupervised methods. Along this line, we develop a latent variable model...
Tibetan person name recognition is one of the most difficult tasks in the area of Tibetan information processing, and the effect of recognition impacts directly on the precision of Tibetan word segmentation and the performance of relative application systems, which include Tibetan-Chinese machine translation, Tibetan information search, text categorization, etc. Based on the analysis of wording rules...
Sybil attacks are one of the well-known and powerful attacks against online social networks. Sybil users propagate spam or unfairly increase the influence of target users. Previous works focus on detecting sybil users. However, sybil users alone do not harm the system. What is really dangerous is that multiple sybil users collude together and form a sybil group. In this paper, we present the first...
This study focuses on the uses of Twitter during the elections, examining whether the messages posted online are reflective of the climate of public opinion. Using Twitter data obtained during the official campaign period of the 2011 Singapore General Election, we test the predictive power of tweets in forecasting the election results. In line with some previous studies, we find that during the elections...
A significant challenge of cognitive radio (CR) is to perform wideband spectrum sensing in a fading environment. In this paper, a novel multi-rate sub-Nyquist spectrum detection(MSSD) system is introduced for cooperative wideband spectrum sensing in a distributed CR network. Using only a few sub- Nyquist samples, MSSD is able to sense the wideband spectrum without full spectrum recovery. Specifically,...
Optical orthogonal codes (OOCs) were introduced by Salehi, as signature sequences to facilitate multiple access in optical fibre networks. The existence of optimal (v, 3,1)-OOCs had been solved completely. For k ≥ 4, although there are some partial results, the existence of optimal (v, k, 1)-OOCs is far from settled. In this paper it is proved that if there exists a (g, 4, 1)-PDF, then (1) there exists...
Addressing to the difficulties in PID parameter tuning, low accuracy in temperature controlling and the dissatisfaction in high exactitude extrusion processing of the present PID controllers, a new kind of PID controller based on RBF neural network is proposed. It can not only obtain a higher accuracy in temperature controlling, but also infinitely approach the nonlinear system with quicker and more...
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