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With the development of internet and information technology network security has become the hot spots of computer science. Effective monitoring operational status of every equipment is very important in the Local Area Network (LAN). This paper studies key techniques for monitoring LAN, such as process automatic loading and hidden, network covert communications, network data secure transmission, to...
In Internet, the public department information system is confronted with increasingly severe threats. In order to protect the public department information security and seize the "Information Superiority", great emphasize must be laid on the information security assurance. The key point of solving the problem of public department information security is constructing the architecture of information...
Dynamic risk evaluation model provides a new way against to the efficiency of traditional static evaluation model which only focused on the results made at a time. It is a model to transfer the information system into topological and combinational construction, users' operation of the information system into the conception of visiting route, the connection between components into independent and collaborative...
We develop a remote monitoring system on environmental quality of Heihe river basin. The system consists of client and server, client is responsible for collecting data. We use multi-thread approach to develop server software, realizing online monitoring of sensor device, data management and log management and so on. Server uses Socket programming to communicate with client, the system has been running...
Ultra-wide-band (UWB) wireless systems are often applied to short-range high-speed data transmission. According to Shannon formula, UWB system with gigahertz band can reach ultra-high data transmission rate. The Shannon capacity of a communication channel is the maximum transmission rate that the channel can support, and it increases with higher signal to noise power ratio (SNR) and wider bandwidth...
This article mainly from the start of the radio signal propagation characteristics, and connecting with the reality, according to the actual situation of some aera, the three typical environment of the topography for signal channel test and modeling is choosen. Through to the research of the zone VHF/UHF band, and a positive approach of the channel test and modeling are got.
BP algorithm based on the gradient descent depends on initial weight selection with slow convergence rate and easily falling into local optimum. This paper presents the PSO algorithm and BP algorithm respectively in the global and local search advantage for the neural network weights optimization, The algorithm was used for the main steam temperature control system. The control strategy improved the...
In this paper, an image enhancement algorithm of video analysis is presented. And the CI value is used as the evaluation function in this system, which can provide a reference to the degree of enhancement. The video image enhancement algorithm based on the point analysis method of multi-dimensional biomimetic informatics. and it work well based on the point analysis method of multi-dimensional biomimetic...
In view of the inconvenience brought by the current digital product copyright protection system, propose a system using the handheld device to detect the digital watermark, which used the handheld device to acquire the watermarked image willing to be detected, uploaded the image obtained to the remote special PC machine through GPRS wireless communication. The special software in PC machine finished...
This paper described a novel speech emotion recognition approach aiming at improving speech emotion recognition rate. Seven discrete emotional states (anger, disgust, fear, joy, neutral, sadness, surprise) are classified throughout the work. Firstly, series preprocessing of speech signals are done. Secondly, extracting features are done, and then we consider incorporating Canonical Correlation Based...
This paper presents the thrust lever angle signal processing of an aircraft engine. The resolver is recommended to measure the thrust lever angle and its operation principle is introduced. The best way to minimize its errors is analyzed. The signal processing from the thrust lever to engine control system and the faults detecting are given.
In order to improve the RBFNN's central choice method, proposed one kind of optimized choice radial basis function neural network data center's algorithm. This algorithm combined SOFM network's pattern classification ability, preliminary results of the classification used as the initial RBFNN data center, and then used OLS algorithm to train RBFNN. Simulation experiments show that the algorithm's...
Based on the border irrigation experiment, the spatial distribution of micro-topography and border width along the border are studied, the sensibility of border irrigation performance to the spatial distribution is analyzed. The results indicates that the variation degree of micro-topography and border width is weak, the distribution uniformity and application efficiency decrease with the increase...
Sustainable development analysis is the important problem in contemporary domestic and international. The analysis about sustainable development evaluation index system spreads widely in the international, this paper analyzes sustainable development index system of research results in the relevant international organizations and main developed countries. We point out the characteristics of the related...
This paper introduces the important significance of fingerprint image segmentation, analyzes some traditional fingerprint image segmentation algorithm about their advantages and disadvantages, and proposes an improved fingerprint image segmentation algorithm, making the fingerprint image with low gray level in the majority to get effective segmentation, which has strong robustness.
To meet the need of high rate and high reliability for next generation of wireless mobile communication system, in this paper, we designed a new communications system of OFDM-IDMA based on QC-LDPC. The performance under different coding rate, different length of frame is analyzed, and we also compared the performance with the system based on convolutional codes, the simulation results show that this...
A method of milling system operation optimization is proposed in this paper. First, use Support Vector Machine to get the relations between milling unit consumption and its related operation parameters. Second, optimize the model with the help of genetic algorithm and composite algorithm, and then optimal operation parameters of this milling system under different working conditions are got, which...
Colleges employment forecasting based on least squares support vector machine is proposed in the paper. Least squares support vector machine is an improved support vector machine, which can use equality constraints for the error instead of inequality constraints. Colleges employment rate of Xinjiang agricultural university from 1997 to 2006 is used to show the effectiveness of least squares support...
The intelligent judgment of nitrogen content in rice has great significance to its healthy growth. Here use soil less culture technique to cultivate rice with different nitrogen levels. In various stages, field spec is used to acquire rice canopy spectra, meanwhile using AA3 continuous flow analyzer to measure nitrogen level in specimen of rice leaves, which constitutes a sample database about rice...
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