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In order to improve the transmission velocity in mulitipath fading wireless channel, the high speed OFDM technology receives increasing attentions in mobile communication. Modulation programs are designed with VHDL based on the principle of OFDM in the paper. First, after OFDM fundamental is introduced; two main advantages are obtained via discussing spectrum utilization ratio of OFDM. Then, from...
It is found that ontology merging is the most effective way to solve the problem of ontology heterogeneity in distributed environment which can hinder the inter-operability of the services by using ontology to describe Web services and merged ontology can provide a good basis for the inter-operability of services. To solve this problem, firstly a framework for multi-mapping based ontology merging...
This paper presents a new type for detection of spiral bevel gears by using machine vision technology. It is a high efficiency, high precision and non-contact detection system. The concrete method is shown as follows: Cameras were calibrated with improved Tsai two-step method. Then, the two cameras in two different orientations taken gear images. After matching the two images robustly, using correspondence...
A novel video smoke recognition method based on optical flow is presented. The result of optical flow is assumed to be an approximation of motion field. The method is proposed as following, first, moving pixels and regions in the video are determined by a background estimation method. Then, a pyramidal implementation of the Lucas Kanade feature tracker is proposed to calculate the optical flow of...
Focusing on the problem of resource allocation under large-scale, distributed, autonomous, heterogeneous and dynamic environments in grid computing, a heuristic algorithm combining fuzzy clustering with application preference is proposed. Fuzzy clustering method is applied according to a group of features, which describe the user's application preference, to realize reasonable pre-classification resource...
According to the circulation process of financial indicators flow, data flow, capital flow involved in financial supervision work, based on the financial data center, designs a five-story architecture for the system including monitoring and analysis of budget preparation, monitoring and analysis of budget adjustments, monitoring and analysis of budget implementation, monitoring and analysis of accounts...
In this paper, we present a new Neighbor Sharing Selection based Agglomerative fuzzy K-means (NSS-AKmeans) algorithm for learning optimal number of clusters and generating better clustering results. The NSS-AKmeans can identify high density areas and determine initial cluster centers from these areas with a neighbor sharing selection method. To select initial cluster centers, we propose an agglomeration...
The definition of vaccine, vaccine autonomous obtaining algorithm, vaccination operator and evolution of vaccine library are proposed in this paper. The generic clonal selection algorithm is improved by integrating with vaccine autonomous obtaining and vaccination operator, whose purpose is to accelerate the convergence speed of clonal selection algorithm, and improve the efficiency of the algorithm...
A high-speed, real-time method of CCD Image data storage system is introduced. It integrates data acquisition and storage into a single FPGA chip. A SATA controller is designed in VHDL based on the protocol SATA 2.6 and implemented by using the GTX in V5FX70 series FPGA. If several disks are combined to RAID, the CCD data can be stored into SATA disk parallelly with the virtue of high speed, real-time,...
It is the basis for higher levels of benefits that whether a Public transport enterprises can allocate reasonably. During the bus business operations, the phenomenon of peak lack and pling peak idle of vehicle resources, results in a lower quality of service, passenger satisfaction is not high. In this paper, wavelet analysis and neural network methods are used to study the distribution of passenger...
Effective signal processing technology should be used to improve signal-to-noise ratio in air-coupled ultrasonic testing, because of there is feeble signal and low signal-to-noise ratio. Pulse compression of linear frequency modulation could enhance system's signal to noise ratio and distance resolution effectively. Principle of linear frequency modulation pulse compression is introduced, including...
Wavelet multiresolution analysis allows us to detect edges at different scales, also to obtain other important aspects of the extracted edges. However, due to the usual two-dimensional tensor product, wavelet transform is not optimal for representing images. The main problem in edge detection using wavelet transform is that it can only capture point-singularities, and the extracted edges are not continuous...
KNN algorithm is particularly sensitive to outliers and noise contained in the training data set. In this paper, we use the reverse cloud algorithm to map the training samples into clouds. Each attribute is mapped to a cloud vector. Reverse cloud algorithm is not sensitive to the noise on data sets and it can eliminate the impact of noise on classification effectively. By comparing the similarity...
Passive microwave plays an important role in soil moisture monitoring. In this study, a layered soil emission model has been built based on theory of radiative transfer, combined with the random rough surface, soil dielectric constant model and soil moisture algorithm. The soil moisture in different frequencies was simulated and the look-up table set was established between soil moisture and soil...
Wind speed prediction is crucial for electricity system security and planning. In this paper, ensemble Kalman Filter (EnKF) method is employed to predict 10 minutes averaged wind speed. We use Auto-Regressive and Moving Average (ARMA) model as the state function of EnKF, perturb initial wind data to generate ensembles and forecast wind speed data via EnKF. The comparison with in-situ measurements...
Traditional geographical information systems hold only a single state of the `real world'. However, geographic phenomena have not only static but dynamic characteristics. The work described in this paper explicit the development of the conceptual modeling phase of geographic phenomena in a dynamic perspective. This modeling approach highly correlates with the signal transmission and concurrent processing...
This paper probes into the design of the intelligent monitoring system based on S3C2440 ARM microprocessor. It focuses on the difficult points of developing the GUI applications based on Qt/Embedded and the Linux drivers for various types of sensors in the Lab Intelligent Monitoring System project, achieving the combination of Qt/Embedded and the linux system programming.
Organizing images into meaningful (semantically) categories using low-level visual features is a challenging and important problem in content-based image retrieval. Clustering algorithms make it possible to represent visual features of images with finite symbols. However, there are two problems in most current image clustering algorithms. One is without considering the choice of the initial cluster...
The researches on the high efficient, safe and accurate measurement system of magnetic head pitch and roll angles for the HAA in HDD are relatively lack now. In this paper, the perspective projection transformation of the magnetic head object point in the reference image plane was expressed by using the rotary tensor transformation matrix, and the principle for projection deviation angle between the...
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