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.
Orthogonal frequency division multiplexing (OFDM) is a promising technique for the broadband air interface and has been widely deployed in current wireless transmission systems. With the adoption of adaptive modulation and coding, OFDM system can support multi-services dissemination. However, since different services have different quality of service (QoS) requirements, efficient resource allocation...
Based on the genetic algorithm (GA), a model of CNC lathe integrated scheme innovation design system is researched and presented. In this paper, particular emphasis is placed on the fact that CNC lathe systems generally have hierarchical structures. Via treating the integrated scheme designs as the solution to design spaces, a new hierarchical genotype representation is developed with the genetic...
Ultrasonic echoes reflected from the inspected object contain information relative to the location, size and characteristics of defects. Accurate estimation of the echoes parameters is important in ultrasonic nondestructive evaluation (NDE). Model based method is often used to estimate ultrasonic echo signals, which models ultrasonic backscattered signal as superimposed Gaussian echoes corrupted by...
Grinding production rate (GPR) is a vital index of grinding process. Getting accurate and timely information of GPR is the premise of enhancing grinding efficiency and conducting optimization control. However, for complexity of grinding process, there is no effective method to on-Line predict GPR. On the basis of soft sensor principle, a new sCheme that applying improved mixed-kernel support vector...
Extension of Ant Colony Optimization (ACOR) had proposed by Dorigo in 2008, which could well solve optimization problems in continuous space. This paper combined Genetic Algorithm with ACOR to overcome ACOR's disadvantages of slow convergence speed and great probability of converging to local optimum, as is proved by simulation analysis in neural network weights optimizing.
Through coordinate segregation of barycenter moving track of urban cluster, a complex function composed of one trend item and several cycle items is adopted to simulate the change of barycenter??s x-,y-coordinates. And GA is used to estimate the model parameters. It needn??t linearize the model in advance. The methods above can arrive at a satisfactory result on barycenter-moving track of Shandong...
The method of using genetic algorithm to estimate parameters of natural disaster predicting model is given. Two long-term predicting models of agricultural area suffering from natural disaster are set up by using this method in Shandong Province. The models include one and two periodic components respectively. The research shows that genetic algorithm can be used to estimate parameters of complex...
Based on the data from the fatigue test of Epoxy Molding Compound (EMC), firstly with a focus on the application problem of the instability between fitting and prediction error of BP neural network (BPNN), the prediction model of fatigue life for EMC materials is established. In this approach, the network structure is improved with initiative way by reducing input from the perspective of nodes with...
Traditional Grey GM(1,1) Model had its defect when it was applied to forecast relative data series. The relationship between different data series can't be reflected properly. In order to solve the problem, artificial neural network (ANN) is combined to forecast multi-series data. Then the network optimization is aided by improved genetic algorithm (GA). So the network weights and thresholds were...
Weapon-target assignment problem (WTA) was described and its mathematic model was established. Ant colony algorithm (ACA) was introduced briefly; a novel and equivalence coding method to solve WTA based on ACA was proposed. Aiming at ACA's defects, the strategy to select the next node was improved; crossover and mutation in GAs were introduced in, so the search space was opened up. The steps to realize...
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.