Due to the simplicity, immediacy and convenience, micro-blog is gaining more and more attention from all kinds of people, especially the researchers. Recently, topic detection on micro-blog has attracted more interest...
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In crowd animation production, it is difficult to design realistic and natural crowd motion paths using traditional methods. In order to solve the problems in generating paths of a crowd, a new approach based on an in...
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In crowd animation production, it is difficult to design realistic and natural crowd motion paths using traditional methods. In order to solve the problems in generating paths of a crowd, a new approach based on an interactive evolutionary algorithm(EA) named biogeography-based optimization(BBO) is proposed in this paper. The optimization process of individuals is considered as the motion process of a crowd. Specifically, the new approach is applied into a system to generate crowd motion paths and the simulation results demonstrate the efficiency and effectiveness of it.
We present a physically-based animation method for simulating the diffusion of water pollutant in this paper. Our method allows animating the dynamic evolution of biological pollutants(e.g., water hyacinth, algae) on ...
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We present a physically-based animation method for simulating the diffusion of water pollutant in this paper. Our method allows animating the dynamic evolution of biological pollutants(e.g., water hyacinth, algae) on largescale water surface effectively. To enable the simulation of such a phenomenon in large scale virtual environment, we simplify the problem by considering the water pollutants as large patches or clusters of aquatic plants rather than each single aquatic plant. Since there exits obvious interface between the large patches of pollutants and the water surface, we model the evolution of the interface in our approach. We use 2D dynamic curves to represent the interface and the diffusion of the water pollutants can be regarded as the dynamic evolution and propagation of 2D curves. To alleviate the topological changes of 2D curves, we adopt a physically-based 2D level set model to animate the evolution and propagation of the interface. We build a level set equation to model the evolution of the interface. In addition, to handle the large scale virtual environment correctly in our physically-based level set model, an imagebased 2D voxelization method is proposed in the paper. In the voxelization method, the virtual environment will be converted to boundary conditions when solving the level set equation. Finally, the water pollutants diffusion phenomenon is simulated on large scale water surface by merging the interface animation results as well as the large scale virtual environment. Animation results about the algae propagation phenomenon in Taihu Lake show that our method is intuitively to be implemented and very convenient to produce visually interesting results.
In this work, we present a new anonymous HIBE scheme which is unbounded in the sense that the public parameters do not impose additional limitations on the functionality of the systems. In most of previous constructio...
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To improve the accuracy of image retrieval, a two-stage method for annotation-based image retrieval is proposed. In the approach, images are ranked using their attached text information at the first stage, and Content...
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Anonymous is one of the most important security properties for kinds of Internet applications. In this paper, we consider the privacy-preserving problem in the context of public key broadcast encryption. We provide a ...
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Aiming at the problem of constructing huge amounts of projected databases in Prefix Span algorithm,this paper proposes an Improved Prefix Span algorithm for Mining Sequential Patterns,called BLSPM algorithm（based on ...
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Aiming at the problem of constructing huge amounts of projected databases in Prefix Span algorithm,this paper proposes an Improved Prefix Span algorithm for Mining Sequential Patterns,called BLSPM algorithm（based on bi-level Sequential Patterns Mining）.The algorithm use duplicated projection and certain specific sequential patterns pruning,reduce the scale of projected databases and the runtime of scanning projected databases,thus,the efficiency of algorithm could be raised up greatly,and all needed sequential patterns are *** results shows that BLSPM algorithm is more efficient than Prefix Span algorithm in large databases.
Nowadays it is difficult to get overall sentiment orientation of the comment text. To solve this problem, in the paper, the method of multi-document sentiment summarization based on model Latent Dirichlet Allocation (...
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To solve the problem of authorization inflexibility and the problem of coarse-grained attribute revocation exist in the attribute based access control model, a kind of improved attribute based access control model whi...
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Web link structure has attracted great attention in web spam detection. In this paper, we modify the SVM classifier by exploiting web link structure. We firstly construct the link structure preserving within-class sca...
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