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For the recognition of different similar airplane targets, a set of wavelet moment invariants are applied based on the invariant moment theory and wavelet analysis, and a feature selection algorithm based on the DB Index guidelines is presented in order to get a locally optimum feature set. The experimental results prove that this algorithm is superior to Hu's moment invariants and Zernike's moment...
As segmenting the images containing the aircraft target, in order to clearly separate the target from the background, Segmentation Algorithm of Improved Adaptative Threshold Region Images has been put forth in this paper. Using the automatic threshold segmentation of images for many times, the part of Higher Grey Value in the images has constantly been stretching, contrast ratio has been enhanced,...
At present the method of detecting traffic affairs through video sequences is epidemic at home and abroad in intelligent transport systems, though improving the accuracy and reducing false alarm rate are the focuses of today's research. This paper proposes an incident detection method based on the steady-state differences of adjacent videos. The method first acquires data on basic features of the...
Bringing immersive and interactive visualization experiences to end users without requiring them physical presenting onsite, web based virtual reality applications have been successful in many domains. Because of the still limited computing resources of the web clients, interactive navigating through virtual scenes with complex geometric data model becomes a bottleneck in the application. Meanwhile,...
The finite element model for a commercial vehicle cab body in white is set up. The static stiffness and numerical modal of cab are analyzed. Considering the influence of welding spot on static stiffness, strength and first order modal frequency, the welding spot of cab is divided into two areas based on element strain energy density. And welding spot layout of the two areas are optimized by topology...
Analyzing the current developing status and actual problems of radar system simulation, based on continuous system simulation, combining signal simulation and function simulation, considering current development of simulation technique and the request of air battle to EW, the simulation system of Phased Array radar based on MATLAB/SIMULINK is presented and designed, which conquered the contradiction...
By using 10 groups of training data which were collected through testing a cellphone in order to find the overall functions in it, a size estimation model was built by using Mathematics, a tool to help implement a fitting method for the parameters in COCOMO model. By invoking the FindFit function and using the least square method, the parameters were fixed. With two groups of test data, the size estimation...
It is convenient and useful to use the Monte Carlo simulation (MCS) in project schedule management, but at the same time, it provides very few management indexes for schedule risk analysis. Therefore, based on PERT network assumption, the shortcomings of current construction schedule management indexes are summarized and new construction schedule management index is put forward to calculate the criticality...
The complete stress-strain curve of rock is the mechanical property data which is used widely and the most elementary and important. But the material of rock is of special complex natural structure. It is very hard to obtain the complete and true performance data of rock by the common material tester which causes rock broken easily. This paper studies the rock mechanics tester intelligently controlled...
In this paper, kinematic analysis of the 5-PPaPaU parallel mechanism with parallelogram loops was presented. Based on the analysis on the DOF of the mechanism, the prismatic joints placed on the base were chose as actuators. The singularity configuration of the mechanism was researched. The successive transformation matrixes were derived, and then the inverse kinematic equations and direct kinematic...
With the energy crisis and environmental pollution becoming more and more serious, the traditional fuel vehicles have exposed many shortcomings. Electric vehicles gradually became the focus attention of both governments and car manufacturers, and the popularity of electric vehicles will be the inevitable trend of social development, so the electric vehicles charging station will become indispensable...
This paper presents switched modified function projective synchronization of two different hyperchaotic systems using adaptive control method. On the basis of Lyapunov stability theory, an adaptive controller for the synchronization of two different hyperchaotic systems is designed, and some parameter update laws for estimating the unknown parameters of the systems are also gained. This technique...
In order to model the gearbox and global wind turbine system with higher accuracy in short time, this paper focuses on the methods of multi-body dynamic modeling and wind turbine dynamic simulation on the platform of S4WT. By introducing the multibody system and super element approach, a steady-state response is simulated on one 1.5MW gearbox. Through calling S4WT parametric model, a dynamic response...
This paper elaborates on the research of the track laser measuring instrument based on CCD, which uses laser, the strong directional light source, as a measurement benchmarks. The laser beam imaged by the CCD, and then the laser spot center can be calculated by the data processing system, as a result the vertical and horizontal deviation of the track can be measured in the instrument. It can measure...
For real-time environmental monitoring of air quality to design the system, use the virtual instrument test software LabVIEW to achieve real-time monitoring of pollutant gases, With database access toolkit to access Access database for LabSQL, display the Real time monitoring data and trends, Environmental monitoring personnel Customized monitoring time and data storage time based on actual conditions,...
This paper is focused on the research of instruction scheduling technology for clustered VLIW architecture. A novel scheduling technology is presented in this work, which exploits the tradeoff between the balancing of distribution of instructions amongst clusters and reduction of the amount of inter-cluster data communications, and guides the cluster assign and cycle schedule of instructions by estimating...
The main idea of research of temperature compensation for ultrasonic rangefinder is based on the STC12C5608AD MCU and HC-SR04. Its basic principle, the basic circuits, software realization and other aspects are introduced in this paper. Considering the effect of temperature on the measurement accuracy, the system has compensation in the software; at the same time, it has an analysis about the measuring...
The wireless sensor network (WSN) is one new hot spot for both research and industry. However, the energy problem has been becoming a challenge in practical applications for WSN because the sensor nodes are supplied with energy by batteries which are difficult to be recharged and replaced. So many researches are taken on reducing the energy consumption of WSN nodes. Medium Access Control (MAC) layer...
This paper has presented a numerical algorithm for reconstructing CT TF models of systems with pure integrators from their ZOH DT equivalents. The algorithm used basic recursion and simple polynomial manipulations and is well suited for CACSD software. The algorithm performs the reconstruction solely in the frequency-domain; hence avoids intermediate unnecessary steps of realizing the TF in SS and...
Probabilistic neural network (PNN) model is a kind of artificial neural network, which is simple in structure, easy for training and widely used. This method uses Bayes classifying and decision-making theory to constitute the mathematic model of system. With Gauss function as activating ones, it possesses the characteristics of strong nonlinear processing and antinterfering ability. This paper introduces...
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