The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Poyang Lake is China's largest freshwater lake. It has good regulation role to Yangtze River. After the running of Three Georges Project, it influences the water level of Poyang Lake a lot. This paper predicts Poyang Lake's water level, it is the basic of influence research. Once there were many predicting methods, such as ANN, etc. But these methods are not very precisely. This paper uses wavelet...
Hardware Software partitioning is one of the most significant part of Hardware Software co-design of embedded systems, which is directly related to performance and cost. A lot of works have been done such as the simulated annealing algorithm, greedy algorithm and evaluation algorithm. In this paper, a new hardware software partitioning method based on Immune Algorithm was introduced. The model of...
This article established a double antennas positioning method and system model. Considering the impact of white Gaussian noise, SNR difference and time difference of arrival of dual-antenna can be calculated at the receiving end to make equations in multi-path fading channel. In the space of two-dimensional the wave source location can be expressed as the function of SNR difference and time difference.
Communication rate would be reduced and frequency resources would be wasted if traditional OFDM is applied in wireless multi-path channel. The frequency-selective fading makes each channel of OFDM system have different transmission ability. To assure communication quality under meeting BER, we design a kind of new adaptive loading algorithm in OFDM transceiver which could change the assign of bit...
The traditional remote data collection has the shortcomings such as the cover scope is small and the corresponding is unreliable, and the wireless network communication has better timeless and does not have the space limitation. The remote data collection and supervisory system based on GPRS/3G (General Packet Radio Service/The 3rd generation communication) network is discussed and designed in the...
There are many challenges of using all kinds of handheld devices as learning tools, that can connect to the Remote Learning System by cable or wireless network and then browser the downloaded course contents. First of all, network connection, especially wireless link, is usually not persistent and wireless coverage is often limited. In this case, the handheld learning devices become useless and the...
Authentication is one of the most important properties in network security, it is usually ensured by designing authentication protocols which use cryptographic techniques. Unfortunately, practice proved that the analysis and design of a protocol is not easy even it is very simple. The paper describes an automatic generation of authentication security protocols based on the evolutionary algorithm and...
This article establishes mine workers' safety behaviors simulation system through combined virtual reality and mining safety production. The aim is to standardize safety behavior, improve the effectiveness of safety training and accordingly reduce the accidents' occurrence in coal mine. The system is constructed by means of 3D building software. Then, an integrated development in the platform Virtools...
From the perspective of general risk pattern and knowledge reuse, project risk management patterns, including project risk passively solving pattern and project risk proactively planning pattern, are proposed. Their application background, structure, advantages and disadvantages are analyzed then. At last an example is taken to point out that the effective project risk management should balance in...
Data aggregation is a current hot research area in sensor networks. Aiming at the time series data in sensor networks, we present GRBFKPLS (grey RBF kernel partial least squares), a novel prediction model data aggregation of sensor networks. In this model, grey model prediction theory is introduced into partial least squares. By the approach, the input data are firstly mapped to a nonlinear higher...
The research designed a brain-computer interface (BCI) system based on the steady state VEP potential (SSVEP). It used the wavelet packet decomposition technology to extract feature. Comparing with the FFT, this method could avoid the spectrum leakage and improve the information transmission rate. A SSVEP-based controlling system of multi-DoF manipulator was presented in this paper on the basis of...
As a new communication protocol, FlexRay, which is supported by FlexRay Consortium consisting of many biggest automobile companies, is becoming a de-facto standard for automobile communication system. This paper provides a timing analysis of the FlexRay communication cycle, including static (ST) segment and dynamic (DYN) segment, and proposes a methodology to calculate the worst-case response time...
In this paper, The G1 continuity conditions between tensor product B-spline surfaces with single interior knots have been studied, which based on the continuity conditions for adjacent Be??zier surface patches by Wendelin L.F.DEGEN. We presented an algorithm to construct a G1 continuous surface of biquartic B-spline surface patches with single interior knots by carrying out local scheme.
According to current logistics forecast research both at home and abroad, regression analysis and exponential smoothing are of easy computation but unsatisfactory computational accuracy. Gray forecast, grey Markov model and neural network etc. are of high computational accuracy but the course of computation is comparatively complicated. Herein, the author introduce the curve of growth theory, a new...
Base on the traditional internal model control(IMC) principle, the linear quadric Gauss optimal control(LQG) was adopted into the IMC construct in this article. Considering system random noise and measurement noise, based on the system performance index, the process model state feedback controller(LQ) and Kalman filter was designed, Thus the system controller is LQG controller which consist of LQ...
By the Bayesian method, a formalistic description is presented based on the random testing procedure of input area, a Software Reliability Estimation Method is bringed forward that make use of size of the random testing muster and the random right times, It will help to define the prior information needed by the Bayesian method. According to the general information, the prior information and the testing...
According to the characteristics of force-frequency character of quartz crystal and a kind of structure of mono-base multi-electrode quartz resonator, a new signal processing scheme is presented. Base frequency signals are firstly outputted when different places resonator is vibrated synchronously, and then are sent to mixer, after difference frequency signals are obtained, signals are sent to mixer...
Artificial immune algorithm has the ability of doing a global searching quickly and stochastically. But it can't make use of enough output information, and hence do a large redundancy repeat searching for the optimal solution, which reduces the efficiency of algorithm. Ant colony algorithm is convergent on the optimal path through pheromone accumulation an renewal, and has the ability of parallel...
To solve the crossing-linkable polyethylene (XLPE) insulation compound purity evaluation problem, a high speed scanning measurement system was designed according to FPGA. With the updated information technology and advanced electronic devices, it is possible to develop a new inspecting technology for sorting, checking and evaluating material quality, by which defects microscopic images can be real-time...
In mobile ad hoc networks, node's free movement is one of the most outstanding features. Due to mobility, link failure happens frequently so several communication problems such as low successful packet delivery ratio and large control overhead are naturally brought. However, node's mobility may bring dynamic situation, for example, distance between source and destination becomes closer or mobile node...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.