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In twisted wire crosstalk research, common-mode traditional alternative inverted model ignores cross section distance. A new differential-mode twist wire pair crosstalk model considering cross distance is established and the frequency domain of the model is analyzed in this paper with the method of establishing circuit model, mathematical model and solving the parameter matrix chain. The results show...
Calculating the effective parameters (permittivity and permeability) in two-phase composite material is very important. In this paper, hierarchical computing method is used to study the equivalent permittivity and permeability of multilayer composite electromagnetic materials, and to obtain the electromagnetic shielding performance of the materials. Firstly, using of Helmholtz theorem gets electric...
The derivatives in the transmission-line equation can be approximated by difference formula which must satisfy CFL condition. LOD-FDTD provides an unconditional stability method to get the updating equation by alternately solving for the implicit and explicit equation, which improves the computational efficiency greatly, and saves computer resources and memory. In this paper, simulation results demonstrate...
Spectrum sensing is one of the most important technologies for Cognitive Radio communications. Motivated by the infeasibility of synchronization, a spectrum sensing method based on the pilot for Orthogonal Frequency Division Multiplexing (OFDM) is proposed. The proposed spectrum sensing method estimates the pilot utilizing its periodicity and Central Limit Theorem (CLT). After that we use an optimal...
By analyzing the training objectives of CNC technology professionals, We determine the core position of the courses in the professional. In this thesis, We introduce a new model of teaching in curriculum reform, Give the ideas and basis of project settings, Describe the teaching process of task-driven new model and the results achieved with Six-step teaching program.
In order to measure attitude of small, dim and high-speed targets in shooting range, intersecting system based on multiple high-speed CMOS cameras was introduced in this paper. CMOS cameras were laid near from objects for small size, using multiple CMOS cameras to compose intersecting system for big number of targets tested, and selecting CMOS camera between CMOS and CCD for low cost and considering...
A key problem of attitude determination system is how to locate CMOS cameras and deal with relations among them. In this paper, several kinds of multi-CMOS station mode are introduced. Fundamental principles and classification of station mode directly affect on measurement parameters of system. No matter what mode is designed, the ultimate goal is to extend Effective Viewing Field (EVF), increase...
A key problem of attitude measurement of small-multi-target with high speed is how to decide the optimum of the CMOS stations. A multi-CMOS station mode is designed in this paper, multiple CMOS videos were placed on two parallel sides in measurement system, every two CMOS form an intersection viewing field, multiple viewing field join to cover shooting range, which can augment Effective Viewing Field...
An algorithm for estimating displacement of the moving target and background by shift theory of Fourier transform is presented. According to the relation between the change and the Fourier transform of image sequence, the method employs the displacement value of the moving target and background by the difference of Fourier phase spectrum. The algorithm estimates the movements from the whole field...
In tunnel advanced detection, it will use FEM and physical experiment to simulate the anomalous characteristics of the new DC resistivity method of focus-current. Firstly, the principle and electrode arrangement will be introduced in the paper. Secondly, it makes an analog calculation to several relatively typical geoelectric models which apply the finite element method with solving anomalous potential...
We propose and experimentally investigate a highly reliable WDM-PON system. The proposed system adopts the colorless solution. It can detect the failure of the feeder fiber by the polling and restoring mechanism of the system management module, and then trigger the OSW switching to the preplanned path for restoring the disrupted traffic, and produce a broken fiber alarm if needed. The system management...
We proposed and experimentally investigated a highly reliable WDM-PON system. In the system, the software manages and controls the link's switching, the system management module can detect the feeder fiber's failure through sending polling frame, and judges whether it is necessary to send trigger signals to the OSW.
The ability to discover required Web services and select the most proper one is becoming critical in Service-Oriented applications. Many techniques have been proposed to optimize the selections of Web Services by calculating quality of service (QoS). In this paper, we incorporate QoS advertisements of service providers into WSDL documents. The Quality Manager is introduced to discover Web services,...
In order to truly realize the personalized learning in which learners are looked as the main characters, we should focus on the characteristics of learners. In order to obtain the characteristics of learners, we should mine the characteristics of learners. In this paper we put forward a kind of data mining algorithm based on improved decision tree, and combined with the characteristics data of personalized...
With rapid development of Internet information, It is quite an important project for data mining that how to classify these large amounts of texts. In this paper, we propose an improved text classify cluster algorithm, while calculating similarity, we synthetically consider the relationship between keywords and eigenvector representation on base of term frequency statistics, thereby it lessens sensitivity...
The Business Process Execution Language for Web services (BPEL4WS) offers a formal specification for integrating loose-coupled Web services and building flexible business processes. However, due to the increasing number of the available services, it is becoming a new challenge to dynamically select and integrate the appropriate partner services for Internet-scale business processes. In this paper,...
With the rapid growth in the number of both Internet users and applications, bandwidth requirement keeps on increasing in recent years in China. To provide adequate and various services for users, both research and industry have made great progress in optical communications with the support of Government and the contribution of enterprises, universities and Institutes. This paper presents the current...
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