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.
As electronic information technology, the rapid development of network communication technology, electronic government affairs with its opening, timeliness, multi-functional and adaptability, and many other advantages, the rapid development, has become an integral part of social life, and plays a more and more important role. Although in recent years the rapid pace of e-government in Heilongjiang...
By the accounting information system under internet environment, the enterprise group realizes accountant resources sharing, accounting information real-time processing and high integration of finance and business. But it brings up the security question. Base on this, this paper discusses how to guard against security question of accounting information system under internet environment from internet...
The paper analyzed the problem of students' pool ability according to the teaching process of SCM in college, and proposed reform program on the basis of basic experiment projects and comprehensive experiment projects, and described the process of project selection and implementation methods, and established the project design teaching as the core. In the teaching system emphasizes training model...
Project leader's lobbying behavior is a common phenomenon because research projects are constrained by investment funds in science-and-technology enterprises. But two decision-making methods of project at home and abroad, static analysis and options dynamic analysis, usually ignore lobbying behaviors, which cause deviation between analysis results and facts. This paper introduces project leader's...
Along with the rapid application of large-scale integrated circuit, computer system is growing by geometric series, the boundary between hardware and software has blurred. FPGA, a novel technology arisen in recent years has been challenged with the traditional hardware design, because the original method and mode cannot satisfy modern hardware system design. In this paper, we implement the complex...
The paper presents and designs a new-style gas monitor terminal in coal mine based on ARM chip called S3C2410A, which means the hardware and driver's designation of system uses S3C2410A as its central processing unit and also expounds the detail of software and hardware design. The system communicates with metrical instrument by the RS485 BUS. It can monitor the mine gas in network. It has good man-machine...
In order to integrate stereo garage devices in a network and realize information sharing, a communication network based on RS485 is designed. The network is simple but stable and useful. Both hardware design and software design are introduced. In hardware design, some primary schematics are proposed. In software design, communication protocols and data structures are discussed. At last, the service...
Introduces a design of intelligent release which is used TCP /IP communication protocol. In this paper, dsPIC as the core processor and showing the overall hardware design scheme of intelligent release. It can achieve signal acquisition, signal processing and protect power in the grid. And using Ethernet controller ENC28J60 and TCP / IP protocol stack to achieve the communication of intelligent release.
In this paper, a multi-interface Wi-Fi node for Wireless Sensor Network (WSN) is constructed. Wi-Fi is connected through SPI (Serial Peripheral Interface Bus) to form the relatively energy saving wireless transmission. Along with other interfaces, the multi-interface function requirements are satisfied. Firstly, the overall module design framework is introduced, followed by the hardware and software...
In this paper, we use the TCP/IP protocol stack and PPP dialer integrated in single chip terminal to gather information, through GPRS wireless communications to connect internet, transmitting the data to the upper monitor to analysis and process, realizing the remote monitoring to the transmission towers' on-line monitoring to ensure the reliability of electricity and raise the ability of troubleshoot.
This thesis implements a GPRS communication system based on embedded systems and wireless communication technology. In terms of hardware, the system uses S3C2410X as the main chip, and uses the SIM300-GPRS module. The operating system is Linux. So we can achieve PC communicate with the embedded platform through the local net, and it can control the GPRS wireless communication module which is on the...
With the rapid development of embedded technology and the continuous merger of machine building process automation and production management digitalization, Ethernet technology based on network and embedded chip gradually developed into the field of mechanical control. In this paper, it describes the characteristics of embedded control chips, researches on the applications of embedded control chips...
In this paper, a selective control mode for residential area is proposed, which based on load monitoring system. Corresponding device is also studied and designed from hardware structure and math model. Finally, a simulative example is given, using the real experiment in residential house. It provides a hard-handedness method for reducing grid load quickly and effectively, which bring less unsuitable...
The paper presents a kind of intelligent power management system used in engineering seismograph, which consists of power supply circuit based on power module, and power monitoring circuit based on high speed single chip microcomputers (SCM) C8051F320 and 24-digits high-precision analog-to-digital (A/D) converters LTC2449. The design has features such as wide input range, stable output, self protection,...
Information system is a combination of a series of modules and components. During the running of information system, some errors will happen, so how to express errors, locate errors source and fix errors becomes a vital issue in designing, developing, maintaining and integrating of information system. Firstly, the paper proves the weakness of huge information system by probability method, then briefly...
In order to develop an efficient design flow from MATLAB to FPGA, which employed MATLAB for algorithm research and as system level language allows efficient transition from algorithm development. In this paper, we discussed how to integrate MATLAB with HDL design tools such as HDL designer and Precision-C, suitable for rapid prototyping. The design flow not only accelerates process of algorithm development...
DC-link capacitor voltage balance is an important condition for safe and reliable operation of Cascade STATCOM. A novel DC-link capacitor voltage control strategy is proposed for the Cascade STATCOM based on step wave modulation. The purpose of capacitor voltage balance can be achieved by changing the step wave superposition strategy of each H-bridge. Compared with other control strategy, the proposed...
For the previous harmonic measurement devices are complexity on the external circuit in the power system, this paper introduces a new harmonic measurement design which has a small volume, low power consumption, good reliability and cost-effective. This device puts DSC (digital signal controller) as the core system hardware and puts FFT (fast Fourier transform) algorithm as primarily system software...
In order to optimize the open loop control strategy of stepper motor, the velocity profiles of stepper motor were studied. There are three widespread used velocity profiles: trapezoidal, parabolic, and S-curve profiles. In this paper, trapezoidal velocity profile was chosen for further study. In order to accurately generate an arbitrary trapezoidal velocity profile, a new velocity profile generation...
Based on information security technology of speculation implementation hardware, we design and implement the SHIFT(Speculative Hardware based Information Flow Tracking) system to enhance software security in cloud computing platform. SHIFT system uses that processor support delay exceptions, design and implement efficient dynamic information flow tracking technology. The system can detect low-level...
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.