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With the recent development of Information Communication Technology (ICT) in every aspect in our life, cyber crime is also expanding and cyber crime investigation is maturing into a more challenging issue which needs to be confronted. In the early stages of the digital investigation of cyber crime case, digital evidence is inadequate, decentralized and fragmented. In this paper, we present a cyber...
The network security is one of the important factors that influence the development of computer network, under the background of the virtual experiment system is studied in this paper, on the Visual c + + 6.0 and Visual Studio2005 platform was designed and implemented a "network security" virtual experiment system, the system each function module in detail the design idea and implementation...
Performance parameters are the basis of a system design. The optimum performance of the subsystems not always assembles to obtain the optimum performance of the main system. So it's necessary to allocate and optimize the index parameters. This paper firstly introduced definition of the index-allocator which was used to allocate the index parameters of the systems. And the nonlinear programming method...
For the Satellite Navigation Receiver of CDMA system, the circuit which is passive should have well characteristics on amplitude and phase within the pass band, especially in anti-jamming receiver. But the filters in the last cascade of reviver's analog circuits are primary causes of non-ideal channel characteristics so that group delay equalization is efficient and necessary. Narrowband group delay...
One important way to increase biomass utility value is biomass mould pressing, however there are problems such as deformation or strength failure of the plate used in biomass mould pressing jigs. Firstly, L16 (45) orthogonal table and SolidWorks/simulation are applied to analyze the plate model and responses to loading and structure parameters of the plate which includes the maximum stress, the maximum...
Transmitter and receiver homologous system, which contains down-conversion, A/D sampling, digital signal management, D/A recovering and up-conversion, effect the signal passing through the system. This paper presents the corresponding signal transmission model of the system, analysis the influence of phase noise on the signal, and deduces the formula for the first time that describing signal changes...
The reliability of automotive relays directly affects the reliability and the safety of automobiles. This paper mainly discusses one method of the reliability test for automotive relays at high temperature. The reliability test in the high temperature stress was carried out according to the test plan provided. The part of test results and the failure analysis on the typical failure samples were presented.
Qinghai-Tibet Railway has particular geographical position and special climate. Trains fail to work in many special ways. Thus put forward the particular request to rescue technology and equipment. The paper analyses the usual type of train failures and carry out the improvement of rescue technology. According to the special requirements, the paper presents our proposal of operational equipment improvement...
The analysis of digital evidence aims to look for the clues for further crime detection or reconstruct the attack actions scenarios for prosecution in court. However, data corruption, loss, tampering, incorrect interpretation, etc. and too much experiential work and sensory presentation of the investigators will lead an inference conclusion to be fabricated to misdirect crime detection or implicate...
The inference analysis of digital evidence aims to look for the clues for further crime detection or reconstruct the attack actions scenarios for prosecution in court. However, the inference analysis process of computer forensic is more subjective because too much experiential work and sensory presentation are in it. It is even possible that an event never occurred but that an inference conclusion...
By the analysis and comparison of the application of domestic and overseas computer forensics education, combining with the demand of the industry, the characteristics of subjects and the aim of police education in China, an innovative program in computer forensics has been developed and begun in fall 2007. This four-year program consists of courses in general education, major (computer crime and...
In this paper, based on least square estimation, a recursive algorithm for indirect learning structure predistorter is introduced. Simulation results show that of all polynomial predistorter nonlinear terms, higher order (higher than 7th-order) nonlinear terms are so minor that they can be omitted in practical predistorter design. So it is unnecessary to construct predistorter with higher order polynomials,...
Based on the fact that the magnetic levitation system is nonlinear and sensitive, a robust control strategy which is composed of the optimal linear quadratic regulator (LQR) and the sliding mode control is presented. The LQR design makes sure the system performance index is satisfied, while the sliding mode control restrains the disturbance exterior, as well as makes sure fast dynamical response....
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