Institute of Computer Application

Mianyang, China

Institute of Computer Application

Mianyang, China
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Li Z.,Institute of Computer Application | Bin X.,Institute of Computer Application | Fang L.,Institute of Computer Application | Qiang H.Z.,China Academy of Engineering Physics | Xin D.Z.,Institute of Computer Application
Open Cybernetics and Systemics Journal | Year: 2014

Existing antivirus technology depends on extracting signatures. They are inefficient on detecting diverse forms of computer viruses, especially new variants and unknown viruses. Inspired by biological immune system, a virus detection model based on artificial immune and key-signatures extraction is proposed. This model adopt TF-IDF Algorithm to extract virus ODNS from virus DNA parts on code level, and on gene level these virus ODNs are matched by slither window to form virus candidate gene library and normal candidate gene library; then distinguish these gene through negative selection algorithm to generate a detecting virus gene library; Last on the testing procedure level, use a cosine similarity algorithm to estimate the testing procedure relevant to virus. To identify most of new variants and camouflage viruses, virus polymorphism is considered. Different unsteady length genes compose a virus, and a r-adjustable match rule based on RCB r-chunks is adopted to extract virus detecting library, which can mostly present virus signatures. In order to make full use of effective information and fully taking the advantages of relevance between virus genes, in procedure phase, suspicious programs are analyzed in contrast to the detecting gene matching technique, which leads to a fairly level false and positive rate. © Li et al.; Licensee Bentham Open.


Yin M.,Institute of Computer Application | Wu C.,Southwest University of Science and Technology | Tao Y.,Institute of Computer Application
Communications in Computer and Information Science | Year: 2014

The reliability analysis is of great significance for assessing the performance of network storage systems. This paper aims to analyze reliability of network storage system, either with or without maintenance requirement, using quantitative calculation and simulation evaluation. When the devices were non-repairable, a FC-SAN network storage system was tested in three typical redundancy modes (i.e. simplicity, dual-FC switches, dual-server & dual-FC switches).Reliability calculation was performed with help of reliability block diagram and mathematical analytical method. For the repairable devices, Markov analysis and Monte Carlo stochastic simulation were introduced to assess the reliability of the network storage systems. In addition, simulations were carried out to measure a number of reliability indices of the network storage systems. These indices, including availability, mean time to first failure, and the mean up time, are used for analysis and comparison of simulation data. This analysis can provide useful guidance for designing future network storage systems. © Springer-Verlag Berlin Heidelberg 2014.


Qin R.,Institute of Fluid Physics | Wang C.-H.,Institute of Fluid Physics | Zhu W.,Institute of Fluid Physics | Zhang Y.,Institute of Computer Application
AIP Advances | Year: 2012

We perform first-principles calculations of mechanical and electronic properties of silicene under strains. The in-plane stiffness of silicene is much smaller than that of graphene. The yielding strain of silicene under uniform expansion in the ideal conditions is about 20%. The homogeneous strain can introduce a semimetal-metal transition. The semimetal state of silicene, in which the Dirac cone locates at the Fermi level, can only persist up to tensile strain of 7% with nearly invariant Fermi velocity. For larger strains, silicene changes into a conventional metal. The work function is found to change significantly under biaxial strain. Our calculations show that strain tuning is important for applications of silicene in nanoelectronics. © Author(s) 2012.


Deng X.,Institute of Fluid Physics | Zhu W.,Institute of Fluid Physics | Zhu W.,University of Sichuan | Zhang Y.,Institute of Computer Application | And 4 more authors.
Computational Materials Science | Year: 2010

Void coalescence is one of the most critical stages leading to dynamic ductile fracture. In this paper, the effect of configuration on coalescence in single-crystal copper has been investigated using a molecular dynamics simulation. The configuration represented by which defines the angle between the line connecting the centers of two voids and shock direction. The results show that the 60° configuration coalesced most easily. Microscopic analysis revealed that the anisotropic emission patterns of shear dislocation loops around the voids during the compressive stage weaken the local structure between two voids and have a significant influence on coalescence during the tensile stage. An analytical model based on anisotropic dislocation emission has been derived, and it explains the coalescence phenomena very well. © 2010 Elsevier B.V. All rights reserved.


Qin R.,Institute of Fluid Physics | Zhu W.,Institute of Fluid Physics | Zhang Y.,Institute of Computer Application | Deng X.,Institute of Fluid Physics
Nanoscale Research Letters | Year: 2014

We perform first-principles calculations of mechanical and electronic properties of silicene under uniaxial strains. Poisson's ratio and the rigidity of silicene show strong chirality dependence under large uniaxial strains. The ultimate strains of silicene with uniaxial strain are smaller than those with biaxial strain. We find that uniaxial strains induce Dirac point deviation from the high-symmetry points in the Brillouin zone and semimetal-metal transitions. Therefore, no bandgap opens under the uniaxial strain. Due to its peculiar structure and variable sp3/sp2 ratio of the chemical bond, the deviation directions of Dirac points from the high-symmetry points in the Brillouin zone and variation of Fermi velocities of silicene exhibit significant difference from those of graphene. Fermi velocities show strong anisotropy with respect to the wave vector directions and change slightly before the semimetal-metal transition. We also find that the work function of silicene increases monotonously with the increasing uniaxial strains. © 2014, Qin et al.; licensee Springer.


Yang G.,Institute Of Computer Application | Zhang Q.,Institute Of Computer Application | Tang D.Y.,Institute Of Computer Application | Huang C.M.,Institute Of Computer Application
Applied Mechanics and Materials | Year: 2012

We design a data exchange platform with the joint topology, based on data exchange and file encryption technology of messaging middleware and integration middleware, after analyzing the requirements on how to exchange information of different application systems in different security domains. The platform achieves the purpose of exchanging information securely between different application systems and different security domains, in accordance with the requirements of relevant standards. © (2012) Trans Tech Publications, Switzerland.


Pan Q.,Institute of Computer Application | Hu W.,Institute of Computer Application | Li Q.,Institute of Computer Application | Shen Y.,Institute of Computer Application | And 3 more authors.
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2015

In this paper, we propose an adaptive multiple-channel dynamic perception model for autonomous virtual humans in the 3D cartoon games. Our method is based on pleasure arousal dominance (PAD) dimension observation model, and chooses the Ortony, Clore, Colins model as emotion model. Our work studies the influence of emotion state on the motivation state of dynamic perception of virtual humans, and consider the influence of the physiological status (physical power). Our model drives the motivation of virtual human by execution evaluation action cycle, and implements the transformation of emotion in different demands of virtual human by finite-state machine. Finally, we implement a demo system based on the model on PC. The experimental results show that our model can maintain the high credibility, immersive and entertainment of game. ©, 2015, Institute of Computing Technology. All right reserved.


PubMed | Institute of Computer Application and Institute of Fluid Physics
Type: Journal Article | Journal: Nanoscale research letters | Year: 2014

We perform first-principles calculations of mechanical and electronic properties of silicene under uniaxial strains. Poissons ratio and the rigidity of silicene show strong chirality dependence under large uniaxial strains. The ultimate strains of silicene with uniaxial strain are smaller than those with biaxial strain. We find that uniaxial strains induce Dirac point deviation from the high-symmetry points in the Brillouin zone and semimetal-metal transitions. Therefore, no bandgap opens under the uniaxial strain. Due to its peculiar structure and variable sp (3)/sp (2) ratio of the chemical bond, the deviation directions of Dirac points from the high-symmetry points in the Brillouin zone and variation of Fermi velocities of silicene exhibit significant difference from those of graphene. Fermi velocities show strong anisotropy with respect to the wave vector directions and change slightly before the semimetal-metal transition. We also find that the work function of silicene increases monotonously with the increasing uniaxial strains.61.46.-w; 62.20.D-; 73.22.Dj.

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