To accurately track computer viruses,an overlay network that monitors the activities of viruses is constructed.Identifying and locating nodes infected by virus on network is achieved by a naming system in which a node in the network is mapped to a unique serial number of the hard-drive.By carefully monitoring and recording sensitive communication between local system and remote nodes on the network,and suspicious operations on files that originate from remote nodes and entered via some form of file transfer,activities of viruses in both local and network level are recorded and ready for future analysis.These data can also be used in analysis of the mechanism of a computer virus as well as its spreading mode and pattern.
Li YingCao YiqunQiu BenJiao JianShan XiumingRen Yong
Analyses of dynamic systems with random oscillations need to calculate the system covariance matrix, but this is not easy even in the linear case if the random term is not a Gaussian white noise. A universal method is developed here to handle both Gaussian and compound Poisson white noise. The quadratic variations are analyzed to transform the problem into a Lyapunov matrix differential equation. Explicit formulas are then derived by vectorization. These formulas are applied to a simple model of flows and queuing in a computer network. A stability analysis of the mean value illustrates the effects of oscillations in a real system. The relationships between the oscillations and the parameters are clearly presented to improve designs of real systems.
In this paper we will give the statistical characteristics and general principles of an optimal structure of the Internet,which is a scale-free network.Since the purpose of the Internet is to allow fast and easy communication, the average path length is used to measure the performance of the network,and the number of edges of the network is used as a metric of its cost.Based on this,the goal of this Internet optimization problem is to obtain the highest performance with the lowest cost.A multi goal optimization problem is proposed to model this problem.By using two empirical formulas of〈κ〉and〈l〉,we are able to find the statistical characteristics of the optimal structure.There is a critical power law exponentα_c for the Internet with power law degree distribution,at which the Internet can obtain a relatively good performance with a low cost.We find that thisα_c is approximately 2.1.
