Because of the limitations of condition configuration and execution mechanism, the exiting access control models are not flexible and can not support multi-policy. Focusing on this, the paper presents a policy-based access control model (PBAC). Different from the traditional models which restrict session only with subject authorization, PBAC realizes policybased access control by defining attribute to describe session property, performing a new policy management method that is free from application logic, and advocating an independent access control decision mechanism. As a consequence, PBAC is more flexible on restricting session, and makes great progress on multi-policy supporting. The comparison analysis indicates that PBAC is superior to the current access control models.
Aiming at the fact that common pattern recognition algorithms such as LPCC and MFCC have flaws in voice-print recognition, the paper put forward a new algorithm, which employed wavelet analysis, BP neural network and niche genetic algorithm. Firstly, the algorithm extracted time-domain and frequency-domain characteristic variation of voice signal by wavelet transform, secondly, trained the neural network niche genetic algorithm, which solved the problem of local minimum value caused by normal multi-layers neural network, lastly, took the wavelet transform variations as the training data of the optimization neural network. Simulation experiment was carried out. The results indicate the algorithm in this paper is superior to current recognition algorithms, it has fast recognition velocity, high recognition rate, low fault rate and strong robustness with different voice-makers, besides, it can automatically correct errors.
With exponentially increasing information, the demand of the storage system becomes more and more largely.Network Storage is a trend with high scalability, high reliability, and high performance. The network storage systems applied in U.S. army are analysed in the paper, and some opinions for the design of a storage system are presented.Information has become a very important weapon in the information age. The collection and process for the information directly affects the success of the army's operation. It's quite necessary to put the information, such as a file, in a safe area. Therefore, data storage has become an important part in a information warfare. To attain the predominance of information, the armies in the developed countries are working at enhancing the ability of information storage. U.S Army has been leading the world in the aspect of network storage; however it's just the beginning of paying attention to that in People's Liberation Army (PLA).
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