Electronics Science Technology and Application (E-Journal)
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A Brief Discussion on Wide Area Security and Stability Control of Power System Based on Response
Get PDFAt present, with the continuous development of China's social economy, the scale of domestic power system has been further expanded, which also makes the structure of China's power grid system gradually become more complex[1]. Therefore, it is necessary to continuously increase the single unit capacity of power equipment. The purpose is to make the single unit capacity match the operation of power system, so as to improve the operation performance of power system. Besides, it can also increase economic benefits. Based on this, this paper expounds the concept and control mode of power system stability. Then the key technology of wide area security and stability control of power system based on response is analyzed from four aspects. They are wide area dynamic feature information extraction, disturbed trajectory prediction, system stability discrimination and stability control. Finally, the practical application is discussed in detail. It hopes that the power sectors can improve the stability control level of power system wide area security
Application of Finite Element Optimization Design of ANSYS APDL Structure in Bridge Design
Get PDFFor the application of ANSYS APDL in the optimization design of bridge structure, three-span continuous beam bridge is selected, and ANSYS APDL is used for modeling, element selection, meshing, adding constraints and loading constraints. Furthermore, the finite element analysis is carried out. Subsequently, the results are obtained. It is worth noting that the deformation cloud map contributes to obtaining the force and deformation basis of the bridge design model, supports the optimal design of the bridge, and provides a theoretical basis
Various Techniques for De-noise Image
Get PDFWavelet decomposition has a great role in eliminating noise, the aim of this work on different noise removal techniques by analyzing the color image. Based on the analysis of different image compression techniques, this paper provides a survey of existing research papers. Different types of method for noise are analyzed from the necessary image, where the disturbance was removed using wavelets with basic theories, and the most important details that will be presented in this work, which clarifies the proposed smooth and effective theory in terms of accuracy in our results. By creating new algorithms that explain how to use the proposed theory, some medical applications were used Discrete Wavelet Transform (DWT) where the results were satisfactory obtained, our proposed theory has been proven to be effective, and examples used will demonstrated this method
Digital Pre-distortion Technology For Optimization Design Of VDB Transmitter
Get PDFDue to the nonlinear distortion of the power amplifier, the problems of in-band distortion and Adjacent Channel Interference will occur in VDB transmitter .To address the problem ,this paper introduces a digital pre-distortion method based on memoryless polynomial model ,which can solve the coefficients of digital pre-distorter with indirect learning structure. The results show that the digital pre-distortion method can effectively improve the third-order intermodulation distortion, the adjacent channel power ratio (ACPR) and the error vector amplitude (EVM) of VDB transmitter, and it can also improve the performance and efficiency of the communication system
Research on the Application of Virtual Reality Technology (VR) in Landscape Design
Get PDFWith the continuous acceleration of urbanization in China, the construction scale of landscape gardens is constantly expanding, which can optimize the urban environment while bringing people pleasure, highlighting the ideas of the modern landscape gardens. However, due to the complexity of the garden design and in order to achieve a good viewing effect, the relevant designers should attach great importance to the use of virtual reality (VR) technology, optimize their design patterns, making the garden more interactive and perceptual and giving people a good viewing experience
Supply, Sales and Inventory Management System Based Java and SQL Server
Get PDFThe development of the inventory management system mainly includes the establishment and maintenance of the database and the development of the Java. The purpose is to facilitate the store operators to input and modify the data of incoming and outgoing merchandise, customers and suppliers, easy and fast incoming and outgoing merchandise data search, complete incoming and outgoing merchandise receipt and payment fund management, and flexible incoming and outgoing merchandise inventory statistics. This paper presents the detailed design of this management system, with particular emphasis on the database part of the design, including requirement analysis, conceptual structure design, logical structure design, physical structure design, etc., and detailed testing of the system's functions
BCD to 7-Segment Decoder
Get PDFThis paper mainly studies the effect of binary algorithm and truth table on digital circuit, and analyzes its logic circuit (from 0 to 9). Binary algorithm is used to make its truth table, draw the circuit diagram and make its PCB template
The design of over travel of automobile relay and its automatic control
Get PDFwith the development of the automobile industry, more and more general electrical parts are used in automobiles, and the quality of platform and standardized electrical products is also paid more and more attention. Relay plays an important role in auto regulation, safety protection and conversion circuit, so it is widely used in the whole vehicle.Over travel is one of the important parameters of automobile relay, and its consistency affects the life of relay and other main performance. In traditional manual assembly production or semi-automatic assembly line, due to the inherent errors in parts and assembly, a large number of manual adjustment relays are often needed to over travel
Review of Facial Recognition and Liveness Detect
Get PDFFacial recognition technology has been dramatically integrated into almost all the aspects of human life, such as mobile payment, identification applications, security management, and criminal cases, etc. However, these applications can be easily fooled by deliberate spoofing strategies. To ensure the identifications of users and avoid being spoofed are the central cores of this technology. As a result, its safeness and accuracy issues attract researchers to dig into this field. In terms of present existing deception and spoofing strategies, liveness detection plays a significant role in improving the robustness of facial recognition techniques. This paper will summarize the current mainstream facial recognition technology methods. The basic ideas, methods, implementations, and corresponding drawbacks of current facial recognition methods are in this paper. The future trends of facial recognition and liveness detection are also discussed and concluded
Comparison and Enlightenment of Foreign Electricity Market Operation Modes
Get PDFThe separation of the power grid and power plants, as well as bidding for the power grid, was the first wave of market-oriented reform in the power industry, which began in the late 1980s in Britain. The US, Europe, and other developed countries then developed various types of the electrical market in turn. Since the 1990s, China has been reforming the electricity market to choose the most appropriate operation mode. This paper makes some proposals for the existing operation modes of China's electricity market based on an analysis of the key operation modes of overseas markets