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Nowadays, microblogging is becoming a part of people living in network. Because of the importance of popular topic mining, microblogging popular topic mining technology receive widely attention. This paper introduces a popular topic mining method based on microblogging. First of all, we pretreat microblogging content, such as remove noise words and stop words for word analysis in next stage. Next,...
An algorithm for one-way hash function construction based on conservative chaotic system is proposed. The plaintext is divided into a group of message blocks by a fixed length and each message block is iterated some times through standard map. Both the iterations results of every round and the plaintext block determine the two initial values and the steps of iterations in next round. Some items of...
An Improved Baptista algorithm based on conservative chaotic system is proposed in this paper. During encryption, the initial value of the chaotic system is updated timely. The plaintext is divided into groups at the length of a character. In the standard map, when the integer part of y is equivalent to the value of character's ASCII code, iteration is selected as the cipher text. And before each...
This paper discusses the three-dimension visualization of the geological data using the ray-casting algorithm which can display the internal structure of geological body in details. An improved scheme transforming lots of matrix multiplications to a few of vector additions is developed to accelerate the ray-casting algorithm for the imaging of huge amount of three-dimensional geological data. To further...
In this paper, we analyze the influence of the smart phone's mobility on virus spreading for two states: inter-cluster and intra-cluster. Considering the characteristics of mobile network with Bluetooth communication, we build a SIS epidemic model that characterizes the propagation dynamics of Bluetooth worms. Through the analysis of this model, we study the influence of phone moving velocity on virus...
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