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In the Gaussian mixture model based online writer identification system, the writer specific models are usually learned by adapting the universal background model. However, among all the possible adapting plans, which one performs best is still an unsolved problem, as well as the underlying principles. Towards finding the answer, this paper analyses all the combinations of the parameter adaptation...
Considering the complexity of trust among users, we presented a new trust factor model. In this model, trust relationships among users are represented as an adjacent matrix, and trust matrix can be decomposed into two low rank dimensionality matrixes, which are trust factor matrix of users and trusted factor matrix by users, through matrix factorization in this model. User-to-user trust values are...
Cyberspace situation awareness (CSA) is the base of cyberspace operations (CO). A right decision of CO is based on the correct awareness of the cyberspace situation. The paper analyzes two classical models, and then takes account of the characteristics of cyberspace operations, finally proposes a hierarchical, multi-perspectives model. The model employs three perspectives and four layers. The model...
According to the respective advantages of RBAC model and UCON model, Subject, Object, Role, Permission and Operation are all regarded as the instance of the class with attributes and methods on object-oriented programming, role-based access control model with the constraints of Temporal, spatial, attribute and workflow (TSAW-RBAC model) is proposed, the Observer Entity is introduced that assigns the...
In order to overcome the shortcomings brought by the narrow bandwidth of wireless network and limited computing ability of mobile terminals, this paper mainly proposes a 3D model transmission and interactive real-time rendering method over wireless local area network. Firstly, an optimized model simplified algorithm is presented for preserve the visually important vertices longer than other vertices...
The blind channel estimation using oblique projection of MIMO-OFDM system is proposed in this paper. It is introduced firstly of the channel model and receiving-data model. The fundamental principle of oblique projection is considered roughly and the oblique projection algorithm on how to estimate the channel matrix and the ambiguous matrix are both particularly analyzed. The simulation results show...
This paper proposes a model streaming mechanism for colored progressive model based on predictive reconstruction method. After the packetizating of progressive mode and sent at the server side, predictive reconstruction method is developed to help a 3D model render in a desired visual quality even if some model information is lost. In particularly, the method consists of rapid prediction and progressive...
A secure and trusted distribution of digital contents is a fundamental requirement for Digital Rights Management (DRM) system, so that the integrity of user terminal platform should be verified prior to contents' distribution in order to assure that the platform is free from a malicious modification and attack. Recent years the emerging trusted computing has better enhanced the necessary functionality,...
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