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We measure and model the system response times of Web servers with a variation of Webpage sizes and different numbers of users. We use a queue model as the representation of physical measuring and obtain the simplified relationship between Webpage size and number of users. The main result is to provide the relationship among the system response times of Web servers with different Webpage sizes and...
The information system classification is a crucial part of data mining, which aims to analysis the information system, extract important message from complex data, and forecast the future development trend of data. At present, there are many methods to classify the data, for example, Rough Set Theory, Decision Tree, Bayesian Network, Genetic Algorithm, etc. The method presented in this paper, based...
Attribute reduction is one of key processes in rough set theory. In this paper, a new attribute reduction algorithm and a definition of Attribute-Activity is proposed with theoretical basis. It uses Attribute-Activity to quantify the partition capability for an attribute and makes a rough sorting, then makes clustering analysis by calculating the similarity among attributes to modify the sorting to...
Harmonic distortion is an important analog performance index of the seismic data acquisition system (SDAS). A fast algorithm based on modified FFT pruning is proposed to analyze the harmonic distortion of the SDAS. The key of the harmonic distortion analysis is to compute the fundamental and harmonic components of the measured data. In this paper, a comparative analysis between the algorithm based...
In this paper, a new collision detection algorithm based on simulated annealing algorithm which is effective in searching optimal solution is presented. Basic principle of this new collision detection algorithm is as follows: The time variant parameter used for establishing objective function based on kinetic equation of missile and attacked objective is extracted firstly; Secondly, objective function...
How to design the flight control system (FCS) of small-scale unmanned helicopter is still a difficult challenge today. In this paper, one novel control approach based on Multivariable PID Neural Network (MPIDNN) was firstly used to design the FCS of small-scale unmanned helicopter. MPIDNN is suitable for controlling the multi-input multi-output (MIMO), nonlinear, highly coupled, uncertain and dynamic...
It has set up a mathematics model of VRP problem with time windows and has proposed a kind of improved immune genetic algorithm. On the basis of the standard genetic algorithm, it joins in the self-adaptation cross operator and heuristic mutation operator based on triangle show, and uses niche technique to improve the immune algorithm. The experimental result indicates that this algorithm has better...
The monolithic high-shock three-axis piezoresistive accelerometer has the advantages of smaller bulk and less axis-alignment error and so on. However, because of the complexity of the accelerometer design such as multi-dimension coupling, the longitudinal and transverse overload, natural frequency, maximum deflection and other constraints for high-shock applications, it's useful to use optimization...
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