• Volume 20,Issue 10,2011 Table of Contents
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    • >系统建设
    • Electronic Shifter System of Automobile

      2011, 20(10):1-5.

      Abstract (2016) HTML (0) PDF 786.15 K (3861) Comment (0) Favorites

      Abstract:The principle of electronic shifter system, which acts as an electronic mechanical transmission interface components, is studied in this paper. The circuit structure of the system is proposed and the software system is designed. The magnetic field model of permanent column is designed based on Hall Effect and application of Hall Sensor in electronic shifter system is analyzed. Eventually, the system is tested on cars and good control performance is shown.

    • Attendance Management System Based on LBS

      2011, 20(10):6-10.

      Abstract (1924) HTML (0) PDF 609.46 K (3982) Comment (0) Favorites

      Abstract:Traditional attendance systems had many drawbacks. This paper proposed an implement method of attendance management based on LBS. This method combined mobile location-based services and geographic information services, checked the position of mobile terminals held by staffs in real-time, used range search algorithm to determine whether the staff working in designated areas, generate the attendance information. This method could carry out automatic or manual attendance in real time or configure time with the staff track. It was a converged network services to achieve low-cost, high flexibility of location-based telecom value-added services. The simulation shows that the method was able to keep the staff on the issue of the validity of attendance.

    • Enterprise Instant Messaging System Based on RIA Architecture

      2011, 20(10):11-14,242.

      Abstract (1856) HTML (0) PDF 984.21 K (3233) Comment (0) Favorites

      Abstract:Enterprise instant messaging(EIM) technology is a widespread research hotspot recently. Through the analysis of EIM of C/S architecture, B/S architecture, RIA architecture application technology, this paper thinks EIM based on RIA architecture has many advantages. It gives the principle of Flex technology development EIM system based on RIA, and describes multi-user interaction relationship and core functions of message interactive, audio and video interaction, user information management, global state variables management. It realizes EIM system based on RIA. Project practice shows that EIM system based on RIA has certain practical value and commercial prospects.

    • Universal Geographic Information Service of Exploration and Development in Oil Industry

      2011, 20(10):15-19.

      Abstract (1889) HTML (0) PDF 723.63 K (3633) Comment (0) Favorites

      Abstract:The multiple sources of the field spatial data, the heterogeneity between the spatial data and the exploration and development (E&D) data, the diversity of the application systems and other issues seriously hampered the construction and application of geographic information in Oil field. Aiming at the above problems and adapting to the actual demand, a spatial data storage model is designed and the spatial database of oil E&D is established so that a unified management and maintenance for spatial data of E&D is achieved. Furthermore, the integrated E&D geographic information services and data services are created that make the graphical objects display in multi-plane scale and form a combination of graphics and data models and technologies. Finally, a universal geographic information service integration application mode is built, so a new application for geographic information is expanded in oil soft. The research results have solved the GIS data sources, the storage methods, the application mode and other issues of oil E&D. The system has been running on the line that has important practical significance for oil field information.

    • Wireless Video Monitoring System Based on ARM and DSP

      2011, 20(10):20-23.

      Abstract (1502) HTML (0) PDF 707.13 K (3739) Comment (0) Favorites

      Abstract:This paper designed a wireless video monitoring system based on ARM and DSP dual-core structure according to the application requirements of video monitoring equipment. The system adopted CMOS camera to acquire image, which was compressed in DM642 with JPEG2000, read by S3C2410 through the HPI port of DSP, and then transmitted to the server through 3G network. The hardware and software structure and design thought were both illustrated in detail.

    • Micro Personal System of Linux Based on USB

      2011, 20(10):24-28.

      Abstract (1543) HTML (0) PDF 694.95 K (3290) Comment (0) Favorites

      Abstract:In order to meet the requirements of portable office, the paper proposes a method to construct a mini personal system, which uses Linux kernel and components, on the portable and removable USB storage device. The key components of the system, which includes kernel compiling, LFS, AUFS, Grub and so on, are researched and analyzed deeply in the paper. At the same time, the details of the entire constructing process about transporting and system booting are illustrated as well. The new system proposed by the paper has four advantages as follow: smart and portable, a shorter booting time, a lower memory cost and more reliability. The features of the system makes it have bright application fields.

    • Reactive Voltage Collaborative Control System Consisting of DSTATCOM and Micro-Grid

      2011, 20(10):29-32,108.

      Abstract (1620) HTML (0) PDF 816.46 K (3205) Comment (0) Favorites

      Abstract:A reactive voltage collaborative control system consisting of DSTATCOM and micro-grid is proposed. In this system, small-capacity DSTATCOM as a continuous subsystem for rapid continuous reactive power regulation and micro-grid as discrete subsystem to provide large-capacity graded reactive power. Rapid adjustment of reactive power is realized by their collaborative work. Simulation shows that combined running system could effectively suppress voltage fluctuation. Power supply quality is further improved and original power devices capacity is decreased. At the same time, micro-grid reactive power can be real time scheduled. Micro-grid takes responsibility to regulate power quality, not only provide power supply. It could be more easily accepted by distribution network.

    • Intelligent Sun Tracking System Based on S3C2440

      2011, 20(10):33-35.

      Abstract (1609) HTML (0) PDF 603.31 K (3010) Comment (0) Favorites

      Abstract:A new type of sun tracking system based on ARM 32 bit Microprocessor S3C2440 (produced by Samsung) is introduced. The solar altitude and azimuth calculated by the system is used to drive the motor, then combine with photoelectric sensor to track the sun precisely. And the manual control is designed to make the system maintain convenient. The tests show that the tracking control system can reach the expected targets and has great practical value for the improvement of solar energe utilization.

    • Monitoring System for Coagulant Dosage

      2011, 20(10):36-39.

      Abstract (1703) HTML (0) PDF 758.45 K (2913) Comment (0) Favorites

      Abstract:This paper uses VB to design the monitoring System of Coagulant Dosage based on the software of decision-making aided system of water treatment development project. The monitoring System of Coagulant Dosage finishes the data acquisition, display and save, curve, alarm, control and other functions. The monitoring System of Coagulant Dosage is in correspondence with control device. The running results show that the system can meet the demands of monitor.

    • Coal and Rock Identification System of Fully Mechanized Mining Based on DSP

      2011, 20(10):40-43,159.

      Abstract (1507) HTML (0) PDF 948.83 K (2555) Comment (0) Favorites

      Abstract:This paper introduces and designs a system that it is able to achieve coal and rock automatic identification of fully mechanized mining. The system uses TLC320AD50C and TMS320VC5402DSP for processing sonic signals gathered. On that basis, FastICA algorithm of Independent Component Analysis (ICA) is applied in coal and rock interface identification. At last, the design of the soft and hardware also is completed. The system has the high real-time and algorithm processing ability, which is able to achieve coal and rock identification accurately.

    • >研究开发
    • Thematic VSM Based on Ontology Semantic Tree

      2011, 20(10):44-48.

      Abstract (1418) HTML (0) PDF 646.83 K (3239) Comment (0) Favorites

      Abstract:Based on the traditional search model, combining the concept of ontology, this paper proposes a thematic network crawling model based on ontology semantic tree. Unlike the traditional keyword-based subject description methods, the model can describe a subject with semantic concept tree with which it is simple to describe the semantic relationships between concepts. On this basis, the paper presents a method to calculate the relevance of HTML pages and the topic. When analyzing the relevance of URL, it does not only analyze the relevance of link anchor text and the topic, but also analyzes the relevance of the link with an improved PageRank algorithm. Only when the relevance does not reach a given threshold will it download the page corresponding to the URL. This calculation method can greatly reduce unnecessary computational overhead, and make fully use of anchor text and link importance of information. Finally, it calculates the relevance of a web page which is not sure whether it is related to the topic, and ultimately determines whether this page should be collected or not.

    • Representation and Solution of Asymmetric Games

      2011, 20(10):49-53.

      Abstract (1731) HTML (0) PDF 663.63 K (3468) Comment (0) Favorites

      Abstract:Asymmetric Games are common in reality. Many games have emerged non-symmetrical features. But in Multi-agent Influence Diagrams, representing asymmetric games may cause representation explosion and inefficient solving. In order to solve this problem, we propose a new game model to represent and solve asymmetric games compactly and efficiently. A detailed algorithm is given, and an example is used to illustrate.

    • Construction of Diversity Poplar Forest Modeling Based on the "Library" Method

      2011, 20(10):54-58.

      Abstract (1390) HTML (0) PDF 864.98 K (3098) Comment (0) Favorites

      Abstract:This paper introduces a new method of building diverse poplar forest models, based on the "branch library" method. It introduces how to use MAXScript language to achieve the diversity of poplar model under 3ds Max environment. Compared with the simple and repetitive traditional modeling way, this method improves the efficiency of modeling with quick speed operations by the manner of code. At the same time, with age characteristic of the diverse poplar models have some application value in plant simulation and environmental animation field as well.

    • Improved UMHexagonS Motion Estimation Algorithm Based on Sub-Regional Searching

      2011, 20(10):59-62.

      Abstract (1537) HTML (0) PDF 631.71 K (2888) Comment (0) Favorites

      Abstract:H.264/MPEG-4 AVC is the coding standard jointly developed by the Video Coding Experts Group (VCEG) of ITU-T and Moving Picture Experts Group (MPEG) of ISO/IEC. Motion estimation is one of the most time-consuming in H.264/MPEG-4 AVC. In this paper, some of the classic motion estimation algorithms are first analyzed, and then motion vector distribution characteristics is discussed, and a sub-regional UMHexagonS motion estimation Algorithm is proposed. In this algorithm, searching area is divided into nine sub-regions, including one detailed searching region and eight coarse searching regions. Simulation results indicate that the time complexity of the improved algorithm is significantly improved, while the SNR and bit rates are essentially kept invariant compared with UMHexagonS.

    • Wireless Sensor Network Clustering Algorithm Based on Fuzzy Boundary Detection

      2011, 20(10):63-66.

      Abstract (1491) HTML (0) PDF 628.64 K (2955) Comment (0) Favorites

      Abstract:Aiming at the problem that traditional clustering algorithms consider node location apart form energy distribution, this paper proposes a clustering algorithm based on fuzzy boundary detection, which took into account topological boundary information and node energy distribution, and adjusted the probability that boundary nodes participate in cluster head selection according to the network energy distribution. Simulation results indicate that this algorithm can detect boundary nodes of certain boundary bandwidth, make more sensible cluster head distribution than LEACH, and obviously extend the network lifetime.

    • WEB-Based Mining in the Personalized Recommendation System

      2011, 20(10):67-70,119.

      Abstract (1529) HTML (0) PDF 682.01 K (3202) Comment (0) Favorites

      Abstract:Due to the rapid development and wide applications, Internet has led to the information explosion on the WEB. It becomes research hotspots at present how to design effective algorithms and systems based on the technology of WEB Usage Mining. In this paper, we develop a recommendation system called WRS (Web Recommendation System), which is based on the application of WEB. In WRS, we propose a novel algorithm that makes use of the technology of image segmentation to cluster access modules, and adopts the parallel longest common subsequence algorithm to discern users' behaviors. Theoretical analysis and laboratory result show that our system is more effective and the recommendation performance is improved after using the new method.

    • Design of LCD to VGA Controller Using FPGA

      2011, 20(10):71-73.

      Abstract (2139) HTML (0) PDF 628.29 K (3770) Comment (0) Favorites

      Abstract:Aiming to solve the problem that the bandwidth is not enough and the VGA monitor is unstable when using video D/A to convert LCD to VGA, the paper presents an implement method of controller that uses FPGA to cooperate with video D/A processor. This method stores the LCD video data that comes from MCU into SRAM for buffering, then read it regularly as the VGA rules need and send to D/A, which converts LCD to VGA, the whole process is controlled by FPGA, and it effectively solves the problem that video output occupies too much bandwidth. this system has already been used in some monitor and display system on the train.

    • Android Security Reinforcement Technology

      2011, 20(10):74-77.

      Abstract (1714) HTML (0) PDF 646.35 K (4442) Comment (0) Favorites

      Abstract:To protect the Android-powered smartphones, a security reinforcement technology based on mandatory access control is proposed. It is implemented as follows: first, a platform-independent mandatory access control framework is added to the Android kernel; then, security attributes are attached to system objects; finally, a set of fine-grained access rules are made to control applications' permissions. The effectiveness of the technology is proved through the test in an emulator environment.

    • Collaborative Filtering Based on Similarity Fusion of Tag and Rating Under the Background of SNS

      2011, 20(10):78-81.

      Abstract (1688) HTML (0) PDF 650.60 K (2913) Comment (0) Favorites

      Abstract:The emergence of social networking services (SNS) provides an opportunity for the application of tag. In this paper, we choose the website based on SNS as the background, and then integrate tag information into collaborative filtering recommendation system. So we proposed collaborative filtering recommendation system based on similarity fusion of tag and rating under the background of SNS. It can help us to reduce the influence of data sparsity on the recommendation accuracy. First, we calculate the user similarity based on Tag information and Rating information respectively, and then get the integrated similarity by the fusion of these two similarities. Finally, Collaborative Filtering can be executed based on this integrated similarity. Experimental results show that the proposed algorithm can improve the accuracy of the recommended.

    • Node-Disjoint Multipath Routing over Ad Hoc Networks Based on Node Correlation Factors

      2011, 20(10):82-86.

      Abstract (1760) HTML (0) PDF 642.39 K (2895) Comment (0) Favorites

      Abstract:The paper presents a new multi-path routing algorithm (AOMDV-LR) based on the model of node correlation factors to solve the problem of paths' interference in Ad hoc multi-path routing network. This algorithm uses the character that intermediate nodes have the ability of monitoring adjacent nodes' information of receiving packets, and combines the packets' amount of the request from adjacent nodes routing to calculate the correlation factor of each intermediate node. The aim of this algorithm is to get the minimum disjoint path of the sum of correlation factors to ensure the interference degree of the paths' data transmission is the lowest. Simulation results show the proposed algorithm can improve the packet delivery rate uncommonly, and reduce the end to end transmission delay.

    • Heterogeneous Data Integration Middleware Based on XQuery Engine

      2011, 20(10):87-91.

      Abstract (1329) HTML (0) PDF 660.82 K (2572) Comment (0) Favorites

      Abstract:The research of heterogeneous data integration based on middleware is a hot research in this area. Considering the querying efficiency and the ease of use, classified the heterogeneous data source three types based on the data's format and saved method, using xml schema to rebuild each data source, construct a logic database. Take the XQuery processor as a part of middleware to process the xml data specially, then designed uniform interface to operate the data source refer to SQL and JDBC for the user. Based on this idea, designed and implemented a heterogeneous data integration middleware, the experiment showed that the middleware can deal with searching and updating data, with simple using and good expansibility.

    • Improved BFT Topology for Network on Chip

      2011, 20(10):92-95.

      Abstract (1616) HTML (0) PDF 631.04 K (3668) Comment (0) Favorites

      Abstract:This paper presents an improved BFT topology, XBFT, and a routing algorithm to point at the local communication of network-on-chip. The new structure changes some edges link, substracts the number of routers on the BFT topology to form XBFT. The theoretical analysis result shows that when the network size is 64 the number of routers of XBFT topology are less 14.3% than the number of routers of BFT topology and the number of physical links of XBFT topology are less than 10.7% the physical links of BFT topology. The new structure has less area cost and less layout cost than the BFT structure. Simulator analysis bases on gpNocsim using local traffic pattern and uniform traffic pattern, when the network size is 64. The simulation result shows for local traffic pattern, the average latencies of XBFT topology is less than the average latencies of BFT topology, when the injection rate of package less than 0.6, the XBFT and BFT topology had the same performance; When the injection rate greater than 0.6, the latencies of BFT is more than XBFT topology, the performance of XBFT is better than BFT topology. For uniform traffic pattern, when the injection rate is less than 0.4, the XBFT and BFT topology had the same performance; When the injection rate is greater than 0.4, the latencies of XBFT is more than BFT topology.

    • Distributed Data Gathering Algorithm for Energy Heterogeneous Sensor Networks

      2011, 20(10):96-99.

      Abstract (1262) HTML (0) PDF 826.94 K (2835) Comment (0) Favorites

      Abstract:In clustering algorithm of wireless sensor networks, to solve the problem of excessive energy consumption in the cluster heads, an residual energy and node position synthesized distributed data gathering algorithm is proposed in this paper. In cluster heads election phase of every round, it considers the residual energy and the average energy of all the nodes in each cluster, an optimal cluster head is elected in each cluster according to node position. In algorithm running phase the optimum cluster heads of the network is guaranteed, in the mean time, it is avoided to select the node with low energy as cluster head. Simulation results show that in comparison with LEACH and HEED, the node energy consumption is balanced and the network lifetime is efficiently prolonged in our algorithm.

    • Flash Movie Automatic Marking Based on Logical Formal

      2011, 20(10):100-103.

      Abstract (1537) HTML (0) PDF 611.74 K (2634) Comment (0) Favorites

      Abstract:The authors propose a scheme of Flash movie Automatic Marking based on animation effects and describe the question's Marking information by using the logical formal method.Achieve automatic Marking by building the logical formal system. This paper focuses on three components of the scheme: logical formal description, SWF to XML and automatic marking. It describes the whole process of logical formal Marking with example. The analysis of manual and automatic Marking shows that: logical Formal automatic Marking is better than the average artificial error and close to the minimum artificial error.

    • Feature-Based Domain Modeling of Mobile Data Service Management Platform

      2011, 20(10):104-108.

      Abstract (1325) HTML (0) PDF 1.10 M (2509) Comment (0) Favorites

      Abstract:To improve the efficiency and quality of the Mobile Data Service Management Platform updating and maintaining, this paper analyses the defect of the traditional domain model and combining the theory of domain project, build the feature-based domain model. It introduces the function entity to optimize the process of the component extracting. The experiment indicates this new domain model and the component extracting method strengthens the traceability between featrue and component and they are propitious to improve and maintain the platform.

    • Fabric Defects Classification and Identification Based on the Subtracted Images of Wavelet Coefficients

      2011, 20(10):109-112,128.

      Abstract (1541) HTML (0) PDF 868.06 K (2752) Comment (0) Favorites

      Abstract:Fabric defect characteristic curves of the wavelet coefficients are vulnerable to periodic noise in all layers. It cannot effectively extract features and locate defects area. This paper proposed a method of feature extraction and defect segmentation based on the parameters of entropy, energy, variance curve of difference coefficient after wavelet transform. Firstly, it subtracts the horizontal and vertical high-frequency decomposition coefficients with the smoothing coefficients after wavelet transform, removes the periodic noise, extracts maximum, mean and deviation parameters from the curve difference horizontal and vertical coefficient. Then, it uses support vector machine to classify the extracted features. Simulation results show that the method can effectively locate and segement fabric defect region, and the recognition rate increased by 4.17% compared with the features extracted by wavelet coefficients.

    • Cloud Model Generator Based on the Normal True Random Number

      2011, 20(10):113-119.

      Abstract (1756) HTML (0) PDF 700.06 K (3421) Comment (0) Favorites

      Abstract:Most cloud model generators are based on pseudorandom number. With the research of the development situation of random-number generator and cloud model at home and abroad, this paper designs a high-quality-random number-producing hardware project and uses the software solution to gradually convert the uniformly distributed true random sequence into an one-dimensional cloud model of normally distributed true random numbers. It disscusses in depth about the implementation of cloud model generator based on true random numbers. It is the first time in our country and is helpful to the study of cloud model.

    • Improved Robots Localization Decisions Based on Multi-Sensor Fusion

      2011, 20(10):120-124.

      Abstract (1442) HTML (0) PDF 651.83 K (3500) Comment (0) Favorites

      Abstract:In a complex and uncertain environment, using a single sensor on the robot localization is poor in accuracy and reliability, and susceptible to the interference. For this problem, the mobile robot SLAM algorithm based on the particle filter is improved for use of multi-sensor fusion algorithm. The new algorithm fuses observe information on the feature level to take advantage of redundant information collected by various sensors, and the fusion information of observations were used to estimate the posterior probability distribution of robot path and the environmental characteristics. The simulation results show that the improved algorithm in accuracy and reliability of SLAM has greatly improved, and demonstrated the feasibility of the methods.

    • Simulation Study on PID Control Based on the Fuzzy Control Theory

      2011, 20(10):125-128.

      Abstract (1359) HTML (0) PDF 757.24 K (3220) Comment (0) Favorites

      Abstract:This paper describes a focus on control of the theory to control the pid, a control on the basis of adjustment and integration, in proportion to the differential of parameters, will be blurred with pid controller control theory be combined, which is more accurate to systems requirements. This article by matlab and simulink for the simulation in laboratories system of control and pid controller dim union under control system is simulation image as compared with a pid control from adaptable, adjustment time and lu great.

    • PID Neural Network Control System Based on Improved Particle Swarm Optimization Algorithm

      2011, 20(10):129-132.

      Abstract (1386) HTML (0) PDF 679.23 K (2790) Comment (0) Favorites

      Abstract:The traditional PID neural network (PIDNN) limited the scope of application and integration problems are difficult to obtain the error rule. For the realization of nonlinear multivariable control systems, neural network control system to expand the application range of this paper, based on improved version particle swarm optimization algorithm for PID neural network control system design solution, replacing the traditional BP back the propagation algorithm, simulation results show that compared with traditional PIDNN, the steady-state system, robustness and accuracy have improved obviously, this method is effective to improve the use of PID control, intelligent method for the PID Control proposed a new reference.

    • >实用案例
    • Automatic Weather Station Remote Monitoring and Online Instruction Service System

      2011, 20(10):133-136.

      Abstract (1363) HTML (0) PDF 736.35 K (3106) Comment (0) Favorites

      Abstract:The system builds the internet information management platform using the networking. In SQL database and under dynamic visit technical support, skeleton based on B/S structure onstage “monitoring information inquiry system” and C/S structure backstage “data analysis and management system”. It carries on the omni-directional real-time monitoring to the automatic weather station running status, the prompt accurate discovery equipment failure and Give warning Alarm information send out through 121 SMS platforms, the serviceman can receive the breakdown information promptly, in consulted the instruction module under the support has realized the online instruction service.

    • Research and Implementation of the Embedded Linux Graphic on ARM

      2011, 20(10):137-141.

      Abstract (1852) HTML (0) PDF 658.57 K (5973) Comment (0) Favorites

      Abstract:This paper mainly researches the embedded linux graphic. In this paper, we first construct a basic Linux system on the ARM9, then transplant X protocol into the system. After that, a small window manager—MatchBox is transplanted into this system, too. At last, we transplant the GTK+ graphics library and the GTK+ applications.

    • Virtual Infrastructure of Financial System Based on IaaS

      2011, 20(10):142-145.

      Abstract (1529) HTML (0) PDF 1.39 M (2667) Comment (0) Favorites

      Abstract:With shortcoming of financial original system at the beginning, the article stresses on design idea and realization process of finance virtual infrastructure optimization, which refers to advanced idea of IaaS and uses modern main technologies such as virtualiation management program and virtualiation machine.

    • Design and Implementation of Wireless Transmission Module in ITS

      2011, 20(10):146-149.

      Abstract (1601) HTML (0) PDF 617.93 K (2943) Comment (0) Favorites

      Abstract:The authors propose a system design of wireless transmission module based on GPRS in ITS, also describe functional modules of the system and their working principles. At the same time, they explain its hardware and software modules and key technologies on realization in detail. An installation test on bus of the system proves that the system has good reliability and practicality.

    • Design and Realization of Network Base Station for Remote Electronic Voting Based on ARM

      2011, 20(10):150-153.

      Abstract (1425) HTML (0) PDF 907.50 K (3031) Comment (0) Favorites

      Abstract:This paper designs and implements a network base station used in the remote electronic voting system. The base station is based on embedded ARM, and expands Ethernet and CAN Bus peripherals in hardware; in software, it ports the embedded operating system μC/OS-II and the TCP/IP protocol stack LwIP, programs Ethernet and CAN Bus driver and application code. The network base station successfully completes its pivotal role in communication.

    • >应用技术
    • Application of Design Patterns and Component Technology to Business Logic Layer

      2011, 20(10):154-159.

      Abstract (1566) HTML (0) PDF 1.17 M (3050) Comment (0) Favorites

      Abstract:In the post-maintenance of software application, the change of business logic layer occupies the majority, but some traditional development frames, for example structs, spring and so on, which based on MVC pattern has only realized the model-view-control solution coupling, however the business also has the close coupling relations in the business logic layer. If a change happens in the module, that will cause a chain-like reflection and a series of related modules change. This article uses the business case report as an example, which achieved the business component transfers and the business component visits indirectly, separated the business functions from business logic, so constructed an extension strong, easy to maintain and configure nimble module in business logic layer.

    • Probe-Sending Methods Based on Unicast Network Loss Tomography

      2011, 20(10):160-163.

      Abstract (1894) HTML (0) PDF 703.59 K (2412) Comment (0) Favorites

      Abstract:Network tomography is a new technique to infer the network internal performance or logic topology only by end to end measurements. In this paper, in order to strengthen the correlation between probes and indeed improve inference accuracy, we propose a new probe-sending methods to get the internal loss rates. NS2 simulations demonstrate the feasibility of this tomography method.

    • Design of Fractal Art Images with Improved Newton-Raphson Method

      2011, 20(10):164-167,188.

      Abstract (1504) HTML (0) PDF 774.40 K (3426) Comment (0) Favorites

      Abstract:Newton-Raphson method is one of the core algorithms which provide materials in the process of the realization of fractal art images. But there are some deficiencies such as low displaying speed, little varied patterns and difficult controlling in resulting fractal images with Newton-Raphson method. Thus, based on Newton-Raphson method, a modified algorithm of generating fractal images ? p-DQDA is proposed in this paper, greatly improving the speed of creating fractal images. And the general Newton iterative approach embedding parameters in the iterative process is also proposed, making it possible to generate a wide range of fractal art images with symmetric beauty by a simple parameter adjustment while drawing fractal images, thus enriching the resource library of fractal images.

    • Application of .NET Remoting Technology to Acidification Measure Analysis and Evaluation System

      2011, 20(10):168-171.

      Abstract (1314) HTML (0) PDF 792.81 K (2598) Comment (0) Favorites

      Abstract:The increase of the number of wells acid into during the Oil field development brings out the huge workload of the acidification measure effect statistical analysis and evaluation. Manual operation mode no longer fits for the demand of constructive information for enterprise. Aiming to the existing problems and challenges of oil companies, the paper proposes the acidification measure analysis and evaluation system based on. NET Remoting technology. The use of the remote efficient communication technology and complicated object model of. NET Remoting implements the remote access and resource sharing. Application on DaGang oil field showed that it was doing well to meet the requirement of upstream and local data for statistical analysis and evaluation results.

    • USBKey Remote Hijacking Technical Analysis

      2011, 20(10):172-174.

      Abstract (1359) HTML (0) PDF 620.46 K (3605) Comment (0) Favorites

      Abstract:Authentication technology plays an important role in the open environment for information system, so people continue to explore practical applications, to find a series of authentication technology. With cryptography, smart card technology developing and maturing, a combination of modern cryptography, smart chip, USB authentication technology has finally appeared in front of us. In this paper we find a detection technique based on API Hook, used to verify the identity authentication based on USBKey.

    • Evolution Model Based on Moore Parity Cellular Automata

      2011, 20(10):175-179,197.

      Abstract (1461) HTML (0) PDF 719.23 K (3320) Comment (0) Favorites

      Abstract:The cellular automata theory is a little weak, the research and analysis in evolution rules of cellular automata is a wide-concerned challenge. In this paper, the evolution model of Moore Parity Cellular Automata (MPCA) is proposed based on Parity Cellular Automata(PCA). Through a large number of computer's simulated experiments we make some analysis and comparisons on the evolution rules between the PCA and MPCA and also find these cellular evolution models have some rules of evolutional cycles and evolutional primitives during the evolution. A new way of research cellular automation evolution rules is provided. The proposed evolution model is further applied to designing pattern of maintained style designs. Enrich the method of generating pattern of rules texture.

    • Advanced Search Page-Based Dynamic Form Search

      2011, 20(10):180-183.

      Abstract (1561) HTML (0) PDF 748.73 K (2994) Comment (0) Favorites

      Abstract:According to the characteristics that the input information can be reflected by the textual content ahead of input item, this paper has proposed a method to dynamically fill the form items by parsing them, and solved the problem that how to search multiple web sites with the same type using their own advanced search page. In this paper, book shopping website was chosen as research object. Using the method of dynamically form, some resulting pages can be generated, then it will parse and sort these pages by their weights, and at last display them in the same format. At last, a satisfying result has obtained in the experiment and confirmed the algorithm accuracy, thus it can be used to search multiple websites with the same type, using their own search engine.

    • Application of GAlib to the Implementation of Genetic Algorithm

      2011, 20(10):184-188.

      Abstract (1635) HTML (0) PDF 725.02 K (3680) Comment (0) Favorites

      Abstract:Genetic Algorithm (Genetic Algorithm) is a random investigation method simulating Darwin's biological evolution, and it is applied to the fields like combinatorial optimization, machine learning, signal processing, adaptive control and artificial life. However, the implementation process of genetic algorithm is very complicated and easily introduce error artificially, and influence the accuracy of research. for this problem, the key technology of implementing genetic algorithm based on GAlib(Genetic Algorithm Library)class library is discussed. Finally, genetic algorithm is implemented using GAlib and evaluate the algorithm by solving the traveling salesman problem(TSP), the results shows that the genetic algorithm implemented based on GAlib is easily programming, highly readable,and results are accurate.

    • Grid-Based and Information Entropy-Based Clustering Algorithm for Multi-Density

      2011, 20(10):189-192.

      Abstract (1474) HTML (0) PDF 1.12 M (2542) Comment (0) Favorites

      Abstract:Although many existing clustering algorithm can find the arbitrary shape and different size clusters, but it is difficult to obtain satisfactory results for multi-density data set. In order to improve the quality and efficiency of clustering algorithm, the paper presents a new improving precision clustering algorithm based on grid and information entropy, which through information entropy which carried by the different densities of grid to automatically calculate the density threshold, and then identify different clusters in the multi-density data set. Experiments show that the algorithm can wipe off the noise effectively and find out the multi-density clusters that have better clustering results.

    • Rapid Application of the Stereoscopic Display in Virtual Reality

      2011, 20(10):193-197.

      Abstract (1436) HTML (0) PDF 773.83 K (2760) Comment (0) Favorites

      Abstract:This paper proposes the concept of the stereoscopic camera. And then it is used to analyze the properties of the parallax, the distance between pupils, and the transformations of the view and projection in the parallel axis projection method. Finally this paper gives the steps of the stereoscopic development. The experiment shows that following these steps, the application developer can develop the virtual reality program supporting stereoscopic display without several attempts to obtain a good stereoscopic effect. The program development time can be greatly reduced.

    • Topic Crawler of Car Parameters Based on Event Driven

      2011, 20(10):198-201.

      Abstract (1478) HTML (0) PDF 554.89 K (3067) Comment (0) Favorites

      Abstract:Large amounts of data on the Internet were hidden in the deep Web. Traditional topic crawler could only get surface data, and crawl the deep data was powerless. This paper established simulation model of Event-Driven, Used improved filtering algorithm based on BM by links, and content filtering algorithm based on VSM(vector space model), with model parameters of car, used Htmlparser to analysis dynamically generated pages, processed their structures to store in database, thus achieve extraction and parsing of car's information. The results of experimental show that the model for the same field datas has a good event trigger adaptability and high filtering accuracy.

    • >经验交流
    • Vehicular Data Compression Algorithm

      2011, 20(10):202-205.

      Abstract (1419) HTML (0) PDF 742.11 K (2961) Comment (0) Favorites

      Abstract:A linear-fit algorithm used for on-board vehicle data storage is presented, which is implemented by using a SQL database based on ARM-Linux operating system. The results show that the compression performance is very good for larger numbers of successive data and the number of data would reduce rapidly. In particular, a high compression ratio can be gained by the proposed method for low data fluctuation and less sample interval.

    • Implementation of Snake Game for Making English Sentences

      2011, 20(10):206-209.

      Abstract (1504) HTML (0) PDF 529.69 K (3681) Comment (0) Favorites

      Abstract:Making sentence using given words is an important approach in juvenile English teaching. To increase student interest in learning, this paper develops an English teaching game based web using JavaScript. It is imitates the snake game and it results in better teaching effect.

    • Bivariate EMD Analysis Method for Discrete Plane Curve Smoothing

      2011, 20(10):210-214.

      Abstract (1513) HTML (0) PDF 748.35 K (2955) Comment (0) Favorites

      Abstract:Curve smoothing plays an important role in both Computer Aided Geometric Design and related manufacturing industries. In this paper, considering discrete digital curve is looked as non-stationary signal, a novel method of filtering discrete digital plane curves based on Bivariate Empirical Mode Decomposition (EMD) is presented. Firstly, separate the variables of the discrete plane curve, and parameterize them into two one-dimensional signals. Secondly, use the method of EMD to filter and remove the high-frequency noise of each one-dimensional signal. Finally, obtain the smoothing curve by combining these two processed one-dimensional signals. Meanwhile, in order to eliminate the boundary effect caused of the process of EMD, the method of symmetric extension of endpoints is proposed. The results of experiment show that the new method is effective while smoothing the bivariate discrete plane curve.

    • A Novel Watermarking Based on Genetic Algorithm and BP Neural Network

      2011, 20(10):215-218,205.

      Abstract (1622) HTML (0) PDF 1.12 M (2666) Comment (0) Favorites

      Abstract:In this paper, a novel robust watermarking research for color image based on the Genetic Algorithm(GA) and BP neural network is proposed which combine the advantages of BP neural networks and GA algorithms. During the detecting process, the GA aims to optimize the parameters of the BP neural networks and the optimum values are regarded as the initial values and weight matrix of the BP neural network parameters. Furthermore, we utilize the gradient descent learning algorithm to adjust the parameters to data fusion the watermark confidence. The experiments show that the watermarking algorithm is imperceptive and more robust than the BP neural networks method.

    • Application of MathGL in Dynamically Generateing Mathematical Graphics

      2011, 20(10):219-223.

      Abstract (1595) HTML (0) PDF 729.03 K (5616) Comment (0) Favorites

      Abstract:MathGL is a library for making mathematical graphics. This paper demonstrates the usage of MathGL with three examples.

    • Hybrid Genetic Algorithm to Improve Premature Convergence

      2011, 20(10):224-227.

      Abstract (1369) HTML (0) PDF 677.80 K (3083) Comment (0) Favorites

      Abstract:For the premature convergence in traditional Genetic Algorithm, this paper comes up with a new enhanced algorithm which introduced new strategy called “equalization measurement on the concentration of the replication”, together working with the traditional hybrid SA-GA. Through dynamic adjusting on roulette sector to prevent polarization of individual fitness, so that avoiding premature convergence of the algorithm to local optimal solution; Mean while validated the feasibility of algorithm with one engineering example.

    • Vehicular Data Interaction System

      2011, 20(10):228-231.

      Abstract (1532) HTML (0) PDF 801.31 K (2429) Comment (0) Favorites

      Abstract:A vehicular data interaction system is designed, real-time display of vehicular information and vehicle node control are implemented by using a touch control interaction interface, and real-time back-up for important vehicle data is implemented by adopting embedded database SQL. Based on an ARM-Linux operating system platform, system functions are performed as designed.

    • Implementing NET-SNMP Agent in ARM9

      2011, 20(10):232-235,149.

      Abstract (1428) HTML (0) PDF 1.01 M (4817) Comment (0) Favorites

      Abstract:SNMP is convenient for complicated network management, which is able to standardize network management. The network management of digital television is based on SNMP. The agent is built on the ARM9 platform of digital television front-end equipment. All the digital televisions are managed by the same platform, which is easy for user management. NET-SNMP is an open source software package. For the sake of code migration and agent extension, NET-SNMP is selected to research and develop the embedded network management system. This article chose NET-SNMP to build agent on ARM9 and realized the running of agent, which laid a solid foundation for monitoring the running of digital television.

    • Analysis and Application of DLL Call in B/S

      2011, 20(10):236-238,227.

      Abstract (1414) HTML (0) PDF 1.01 M (3080) Comment (0) Favorites

      Abstract:Data transfer between client and service in B/S can improve the Security, robustness, stability and reuse characteristics by using Asp file to call DLL module of program library. This paper introduces a new method for data transfer with API functions call. In this way, we can create the calling DLL models based on B/S.

    • Program Loop Characteristics of Multimedia Applications Based on SimpleScalar

      2011, 20(10):239-242.

      Abstract (1570) HTML (0) PDF 587.23 K (2864) Comment (0) Favorites

      Abstract:In recent years, the multimedia industry has been growing at a tremendous rate. The proliferation of the Internet has Pushed multimedia into mainstream computing. It becomes a hot research direction to explore architecture techniques to meet the processing and computing demands for multimedia applications according to multimedia program characteristics and performance analysis. Introduces the MediaBench and SimpleScalar, design a new program analysis tool, PCA (program character analyzer). At last, test the Multimedia Applications and get a conclusion.

    • Evaluation of the Reader's Satisfaction Based on the Knowledge Evolution Algorithm

      2011, 20(10):243-247.

      Abstract (1921) HTML (0) PDF 587.32 K (2755) Comment (0) Favorites

      Abstract:Trough combining evolutionary epistemology theory with biological evolution theory, this paper presents a knowledge evolution algorithm. The basic principle and realizing ways is also given. The evaluating function of the knowledge is created too. When the algorithm is used in the evaluation of the reader's satisfaction in a library, we can obtain successful experiment results. The experiment shows that the knowledge evolution algorithm can promote both the quantity and the quality of the knowledge, which is an effective assistant means to make a correct decision.

    • >产品应用
    • Ultra-Low-Power of Tire Data Acquisition Design for Tire Pressure Monitoring System Based on ATA5749

      2011, 20(10):248-251.

      Abstract (1454) HTML (0) PDF 683.06 K (3227) Comment (0) Favorites

      Abstract:This paper presents a ultra-low power data acquisition in direct-type tire pressure monitoring system(TPMS). The collector uses MSP430 F149 as MCU and ATA5749 as wireless transmission module. The paper gives wake-up circuit of the collector. Finally, it gives software processes of data system by interrupt. The wake-up circuit provides small charge for battery module. The way can delay battery lifecollection module.

    • Remote Monitoring System of Parking Lot Based on SCM and Configuration Software

      2011, 20(10):252-254.

      Abstract (1652) HTML (0) PDF 623.73 K (3294) Comment (0) Favorites

      Abstract:This paper introduces a remote control system of the parking lot, detecting the parking situation of the parking by infrared device, using 8031 of mcs51 series monolithic integrated circuits as the subordinate computer, dealing with the parking signals detected by infrared device, then transmitting them to upper computer through RS-485 bus, and monitoring every partition of the parking by PC camera. Building the dynamic picture of upper computer by configuration software, make it possible to control and dispatch the parking remotely and totally, improving the management system of the parking.

    • >Survey
    • Survey on Image-Based Spam Filtering Technology

      2011, 20(10):255-258.

      Abstract (1732) HTML (0) PDF 524.59 K (3635) Comment (0) Favorites

      Abstract:This paper firstly introduced the basic concept of image-spam. And then it classified image-based spam filtering technology according to different standards. Meanwhile, it analyzed and evaluated the popular and major image-based spam filtering methods and technologies. Then it discussed and compared two categories five classification algorithms which have been used in image-based spam filtering were outlined. Finally, it gave some future directions of research on the techniques of image-based spam filtering.

    • >专论·综述
    • Lean Purchasing Management of Aeronautical Manufacture Enterprise

      2011, 20(10):259-263,247.

      Abstract (1572) HTML (0) PDF 584.93 K (2694) Comment (0) Favorites

      Abstract:This paper analyzed the purchasing management aeronautical manufactures enterprise, and studied the new status and challenges in the theory of lean supply and Lean production. A novel purchasing management mode of aeronautical manufactures enterprise is proposed, adopts the purchasing planning, contract management, and achieve the lean management of purchasing process. This paper designs the lean purchasing management system, which include purchasing planning, contract management, order tracing, vendor evaluation platform and so on. Finally, the proposed system is applied in an aeronautical manufactures enterprise.

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