Table of Content

15 May 2010 Volume 23 Issue 5

  

Articles

A Method for Field Performance Prediction of the IR Imaging System

CHEN Kai

. 2010, 23(5):  1. 

Abstract ( 1241 )   PDF (1081KB) ( 1027 )  

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The traditional methods for field performance prediction of the IR imaging system are first analyzed.Given its disadvantage,a new method for field performance prediction of the IR imaging system is presented.Specifically,the average difference temperature between target and background is obtained from the thermal images,and the TOD rules and target transfer probability function are used to predict the detection and recognition probability.Simulation results show that the predicted values and experimental test results are in good agreement.

Design of the FPGA-based Fast 9/7 Shaping Discrete Wavelet Transform System

CHEN Wei-Bo, DENG Jia-Xian, WANG Hai-Rong

. 2010, 23(5):  4. 

Abstract ( 1969 )   PDF (638KB) ( 1095 )  

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The CCSDS Image Data Compression standard uses 9/7 integer lifting wavelet transform as the core algorithm,which is simple and easy in hardware design and implementation.This paper designs and implements a 9/7 integer lifting wavelet transform system based on FPGA with internal RAM memory to reduce the demand for storage,and with the line-based column transform method,by which the row transform and column transform are done simultaneously,thereby increasing the speed.Simulation and synthesis results show that the design requires less hardware resources and runs faster.

Research on Application of Turbo in DVB-S System

DU Ya-Qi, ZHOU Jian-Ying

. 2010, 23(5):  7. 

Abstract ( 1163 )   PDF (578KB) ( 1237 )  

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Turbo code is applied in many fields for its excellent performance in correction.Turbo-code is introduced to the DVB-S system to improve its performance.A comparison in performance with the conventional system through simulation is made,and the BERs under different SNR by different decoding algorithms are presented.Experiment results show that Turbo-based DVB-S has a significant improvement in performance.

Application and Simulation of STTC Code in QPSK Communication Systems

XU Yuan, JING Sheng, PENG Jian-Yu

. 2010, 23(5):  10. 

Abstract ( 1466 )   PDF (357KB) ( 834 )  

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An improved transmit diversity mode for a variety of wireless channels,the space time trellis code is based on delay diversity combined with TCM code.QPSK modulation is used to suppress the noise accumulation due to the fact that it is more suitable for noisy environment than the QAM and that QPSK modulation possess ideal error protection.The STTC code in QPSK systems has better correction and lower bit error rate and block error rate.

Quasi Three-Dimensional Numerical Modeling and Simulation of Quantum Point Contact Device

KANG Yu, DU Lei, CHEN Hua, SUN Ya-Jie

. 2010, 23(5):  12. 

Abstract ( 1006 )   PDF (508KB) ( 923 )  

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Self-consistent solution of 3D passion-2D Schrodinger equation is applied to compute the distribution of  the potential and the electronic density in the Quantum Point Contact (QPC) device.A comparison is made of the simulation results with the traditional saddle potential.The effect of the gate-structure and bias voltage on the saddle potential is found and discussed,which is of help in designing QPC sensors.

Research on and Development of the Standardized Technology for Geological Map Based on the Evaluation of National Potentiality of Mineral Resources

GUO Jian, WANG Xin-Qing, CHANG Si-Si, SHAO Wen

. 2010, 23(5):  15. 

Abstract ( 1501 )   PDF (953KB) ( 832 )  

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A geological maps standardized module which uses the data dictionary technology,based on the MAPGIS platform and standard mode,is developed to match the standard model for data integration and sharing.The module modifies the structure of geological maps to match the standard model according to the standardized model.It is capable of simple,rapid and accurate standardization of models and data,retaining the original information to the maximum,and simplifying the mapping process,and lays a foundation for maps splicing,data integration,data checking and etc.

Research on ETL Technology in Geological Hazards Data Warehouse of Three Gorges Reservoir Area

CAI Yin, XIAO Dun-Hui

. 2010, 23(5):  18. 

Abstract ( 1120 )   PDF (948KB) ( 798 )  

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In combination with the framework of Three Gorges Reservoir Area's Geological Hazards Data Warehouse and the data characteristics of the geological hazards,the paper presents a set of ETL process for building geological hazards data warehouse.A detailed study is made of the critical technologies such as data extraction,transformation,and loading.The ETL process of geological hazards data warehouse is exemplified by a landslide.

Supporting Research on Application of the Mineral Resource Potential Evaluation Data Model

LIU Xia, WANG Xin-Qing, CHANG Si-Si, GUO Jian

. 2010, 23(5):  23. 

Abstract ( 1322 )   PDF (737KB) ( 818 )  

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The data model of the national mineral resource potential and assessment (hereinafter referred to as “data model”) is the foundation of national mineral resource potential and assessment project,which describes the important intermediate outcomes of the data and the final results of the data itself and its relations in the work.The check of the format of loading data and content for standardization is inseparable from the data model support.Therefore,how to use the data model to support the application is an important issue to be studied.To address this problem,this paper shows how to use the data dictionary technology to solve problems related to model application with a new map which conforms to the data model as an example.

A Green Mode CMOS OSC Circuit for AC/DC Control

YIN Wei-Ke, LI Wei-Dong, ZHU Zhang-Ming

. 2010, 23(5):  23. 

Abstract ( 1088 )   PDF (662KB) ( 866 )  

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The OSC presented in this paper is designed specifically for the constant current and constant voltage (CV-CC) control technology and Jitter Frequency (Frequency Shuffling) technology.In the current control PWM mode,the wave signal has good linearity,and the system automatically enters the Burst mode when the load is light,thus improving its efficiency.The circuit is designed by the 1.0 μm 40 V CMOS process.Pre-simulation and post-simulation are done using Hspice,and simulation results show that it has good performance and can be used PWM circuits.

Quality Evaluation of Motion-blurred Images Restoration Based on Traveling Wave Equations

WANG Fei, SUN Ya-Lin

. 2010, 23(5):  26. 

Abstract ( 1070 )   PDF (926KB) ( 880 )  

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Based on a brief introduction of the existing digital image quality evaluation methods,the objective evaluation criteria for motion-blurred images restoration based on traveling wave equation are discussed.Simulation experiments demonstrate its validity,reliability and consistency of the criteria with subjective evaluation in practical application.

Research on the Monitoring System of Aquiculture with Multi-Environmental Factors

WEI Chuang, HUANG Lin

. 2010, 23(5):  29. 

Abstract ( 1401 )   PDF (816KB) ( 995 )  

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In view of the importance of water quality in aquaculture,this paper designs an environmental factors monitoring system.The system is comprised of host computers (PCs) and slave computers (AT89S51-based one-chip computers).With the help of an expert system,this monitoring system is capable of real-time monitoring,data collection,display and storage.

Research on Digital Library Construction Based on Server Virtualization

HUANG Wei-Min

. 2010, 23(5):  32. 

Abstract ( 1025 )   PDF (377KB) ( 928 )  

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According to requirements of the digital library construction in universities,and using the system integration of the digital library of a higher vocational college as an example,this paper introduces a method based on server virtualization for digital library construction,with the help of the free software ESXi VMware in various database systems.

Research of Cloud Storage of Semantic Web Data

GUO Heng-Heng, ZHAO Wen-Jing

. 2010, 23(5):  34. 

Abstract ( 1481 )   PDF (388KB) ( 1214 )  

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This article describes a solution to the distributed storage of massive RDF data.With the rapid increase in the volume of Web data and the development of Semantic Web,massive RDF data storage becomes an urgent issue.This paper studies several popular distributed storage frameworks,and then presents a method for storing massive RDF data efficiently and collaboratively in the Linux cluster based on the open-source framework of Hadoop Database (HBase).

Design and Implementation of Software Testing Tools Based on Web

ZHOU Yuan-Zhe

. 2010, 23(5):  36. 

Abstract ( 1129 )   PDF (652KB) ( 883 )  

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A major method for guaranteeing the correctness and reliability of Web,Web software test judges the quality of web applications by their response time,link failure,and so no.The Web software tools are designed and implemented to analyze the data and optimize the performance.

Modeling of Petri-net-based Log Data Processing Workflow

XIE Rong-Rong

. 2010, 23(5):  38. 

Abstract ( 1745 )   PDF (616KB) ( 952 )  

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Petri-net is a wise choice to model and analyze workflow for its solid mathematical foundations and explicit structures based on graphics.This paper describes an example of the general workflow of log data processing and presents a model of petri-net-based workflow,whose feasibility is verified by the Murata simplification technique.

Processing System Based on.Net

ZHANG Peng, ZHAO Wen-Jing

. 2010, 23(5):  42. 

Abstract ( 1274 )   PDF (562KB) ( 804 )  

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The article introduces the development of a flexible,reusable,and expandable processing system working on Microsoft Net Framework 3.5.The design scheme used is Data Center to realize the service data exchange between same systems and different systems in a centralized processing and regulating pattern.With the use of the WCF technology,the system is designed to be a distributed program with a service framework of sever and application.The Microsoft Component technology is employed to solve the irregular report formats from the HIML technology of the B/S framework.

Design and Implementation of a Communications Middleware Platform

FAN Qing-Gang, YE Xue-Mei, LUO Yuan-Jun

. 2010, 23(5):  45. 

Abstract ( 1311 )   PDF (635KB) ( 1022 )  

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With the rapid development of informatization,many distributing data management systems have been widely used.Besides their corresponding functions,they are required to be more secure and efficient.An integrated middleware platform is designed and implemented,which is capable of hiding the database from the network and providing secure data communication and interfaces.

Use of Animation in Authorware Courseware Development

LUO Cai-Jun

. 2010, 23(5):  48. 

Abstract ( 900 )   PDF (525KB) ( 793 )  

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The multimedia courseware authoring tool of Authorware is characterized by being  dynamic,three-dimensional,strongly interactive and all-round,and the animation implementation of media objects is of great importance in courseware making.This paper mainly introduces the various methods for Authorware courseware development,and presents some techniques for the use of animation in Authorware courseware development based on an analysis and summary of these methods.

Simulation Analysis of Electromagnetic Radiation of CPU Heatsink

JI Teng-Teng, ZHAO Hui-Lian, XU Liang, CUI Yang

. 2010, 23(5):  51. 

Abstract ( 1515 )   PDF (1073KB) ( 1129 )  

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The electromagnetic radiation characteristics of Pentium 4CPU heatsink are analyzed with the help of HFSS.The influence of the ratio of longside to wideside of heatsink underside and the orientations and heights of fins on first resonance frequency,electric field gain and radiant direction is studied,which indicates that for the ratio of longside to wideside not smaller than 1,the resonance frequency remains at about 2.6 GHz and the gain of electric field stays constant at about 8.3 dB,while the radiant directions change obviously with increasing wideside;and the effects of orientations of fins on electric field and radiant direction can be neglected,while the height of longitudinal fins has a significant effect on resonance frequency.

A Novel EBG Structure for SSN Suppression

HUANG Xiao-Long, SHI Da-Peng, XIE Bin, LU Hong-Min

. 2010, 23(5):  55. 

Abstract ( 1397 )   PDF (799KB) ( 978 )  

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In the applications of modern high-speed and high-performance digital circuits,one of the bottlenecks is the simultaneous switching noise arising between the power and ground planes.For the suppression of SSN,a novel MS-Electromagnetic Band-Gap (EBG) structure is proposed in this paper,whose unit cell consists of a meander line along with slot and square metal patch.Simulation results show that a stop-band of 0.6 GHz to 5.9 GHz and a suppression depth of -30 dB are obtained with the novel EBG structure.Compared with the traditional L-bridge EBG structure with the same size,the stop-band bandwidth increases by 1.3 GHz and the relative bandwidth enhances by approximately 10%.

Real-time Implementation of Linear Convolution Based on FPGA

FAN Hai-Bo

. 2010, 23(5):  58. 

Abstract ( 1549 )   PDF (726KB) ( 1223 )  

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An implementation of fast computing linear convolution based on Fast Fourier Transform is proposed.With the hardware plant based on the Altera's EP2S60,the throughput of the whole system with Altera's FFT IP core is as high as 100 Msps under the 100 MHz system clock.

Prototype Design and Research of FM-DCSK Chaotic Communication System

LIN Xiao-Fan, LI Xiao-Chao, GUO Dong-Hui

. 2010, 23(5):  63. 

Abstract ( 2074 )   PDF (1667KB) ( 974 )  

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This paper presents a prototype of chaotic communication system based on FM-DCSK modulation scheme and realizes partial key circuits of the prototype. At the transmitter,the FM-DCSK modulator generates wide-band FM signal by the Lorenz circuit and frequency modulation circuit. The FM signal is converted to digital signal to implement the delay line and modulation on FPGAs. At the receiver,based on non-coherent correlation demodulation,bit synchronization is carried out by the following three steps:first define the ratio of correlation and energy as timing measure,then set a threshold and slide the integration window to acquire the start time of a bit,and finally track the max of the correlation and correct the timing error via digital PLL. Simulations show that the BER performance of the prototype is close to the thesis,just 0.2 dB degraded.

Design of the 24 V DC Motor Control System

HAN Ze-Xi, XU Yue, GAN Zhi-Qiang

. 2010, 23(5):  70. 

Abstract ( 1222 )   PDF (833KB) ( 1285 )  

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Based on the principle of the PWM DC Speed,this article uses PIC16F690 MCU and MOSFET to design a 24 V brushless DC motor driver.The implementation of the control system with a PIC16F690 microcontroller as the core is described.The overall block diagram of the design,some hardware circuits and control software flow chart are given.The drive has been put into production,and the practical application shows that the design is simple,accurate,efficient,and can meet the requirements of practical engineering applications.

Design of the Portable Electronic Blood Pressure Monitor Able to Monitor Ambulatory Blood Pressure

ZHANG Xu, OU Yang-Bin-Lin, LI Jing-Hui, CUI Bao-Dong, HAN Jin-Hai

. 2010, 23(5):  76. 

Abstract ( 1589 )   PDF (934KB) ( 916 )  

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A portable electronic blood pressure monitor capable of monitoring sequential and ambulatory blood pressure is designed.With the ATmega16 microcontroller as the core,the design realizes A/D conversion,timing of measurement,data storage,serial communications,and LCD display by the oscillometric measurement method.It can be used as a clinic blood pressure monitor,and can also monitor 24-hour ambulatory blood pressure and pulse when needed.The design is novel and extendable and meets the requirements of medical diagnosis.

Design of a Navigation Control Box Based on the C Language

LI Ya-Hong, LI Zhen-Qian, ZHAO Su-Mei, WANG Yong

. 2010, 23(5):  81. 

Abstract ( 1260 )   PDF (599KB) ( 862 )  

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In navigation receiver systems,control boxes are commonly used to electrify the device,switch the working frequency or channel,and control the system volume,display brightness and so on.This article discusses the scopes of application,working principles and circuit implementation of a certain control box,with emphasis on its frequency control and the use of the key unit of the HCMS2924 lattice module.

Design of the Counting System for the Sewing Machine Production Line

XIAO Zhi-Hong

. 2010, 23(5):  84. 

Abstract ( 1261 )   PDF (515KB) ( 978 )  

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A counting system of the sewing machine product line is introduced in this paper.The circuit and software design of the system are also given.With AT89C51 as the control center and optoelectronic switch as the sensor,the system can detect actual quantity of the line and display the time,actual production and plan production.Practical use shows that the system has the advantages of good reliability,easy operation and high accuracy.It can be widely used in the field of home appliance and food manufacturing.

Optimization of the RC Electronic Sawtooth Wave Generator

LIU Chen

. 2010, 23(5):  87. 

Abstract ( 1064 )   PDF (604KB) ( 756 )  

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Sawtooth wave generators play an important role in almost all electronic equipments.This paper presents a sawtooth wave generator with good capability,simple structure,low cost and easy maintenance.The structure and working principles of this generator are introduced.Its performance is deduced by a quantitative analysis based on the automatic control theory.Finally,the examination and maintenance of the generator are presented.

Temperature Transmitter for Museum Use

YANG Huan

. 2010, 23(5):  91. 

Abstract ( 1262 )   PDF (503KB) ( 877 )  

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This thesis presents the realization of a widely used temperature transfer based on serial port in museums.The temperature transfer consists mainly of temperature collection unit,display unit and communication unit,which is directly connected to a computer through serial ports.The temperature data can be read on the show case or be sent to PCs upon request for remote reading,which facilitates the work of the museum staff.

Theoretical Analysis of Packet Filtering Transmission of the Firewall Netfilter in Linux Network

ZHU Yan

. 2010, 23(5):  94. 

Abstract ( 1375 )   PDF (513KB) ( 1066 )  

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The network firewall Netfilter in the Linux network environment IPV4 mount point structure and the transmission of the packet flow are given.The functions of five mount point hooks during the process of data packet transmission and filtering,and the meanings of a variety of possible returned values are presented.Finally,based on the principles of the Netfilter data packets process,various forms of packet filtering implementations are discussed.

Research into the Queue Scheduling Algorithm Based on Multi-service

YIN Hong-Jian

. 2010, 23(5):  96. 

Abstract ( 1081 )   PDF (800KB) ( 842 )  

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The paper discusses several typical scheduling algorithms,and proposes a scheduling algorithm MWRR based on WRR for multi-service.The implementation of this algorithm is given.MWRR dynamically regulates the scheduling order of queue according to the ratio of queue delaytime.MWRR can reduce the delaytime of multi-service,and supplies preferable QoS.The emulation shows MWRR's superiority.

Parameter Selection of Support Vector Machines Based on an Improved Adaptive Genetic Algorithm

LIU Qin, HUANG Xiang-Nian

. 2010, 23(5):  99. 

Abstract ( 1587 )   PDF (544KB) ( 889 )  

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The selection of kernel function is a decisive factor on the performance of support vector machines (SVM).However,most users select parameters by rule of thumb,and frequently fail to generate the optimal parameters effect for the function,which has restricted the effective use of SVM to a certain extent.This paper presents an automatic parameter selection method for SVM combining the adaptive genetic algorithm.This method selects crossover probability and mutation probability according to the fitness values of the object function,and thus reduces the convergence time and improves the precision of GA,insuring the accuracy of parameter selection.The application of this method in off-line handwriting Chinese character recognition demonstrates an improvement of the generalization performance for support vector machines.

An Adaptive Image Fire Detection Algorithm

ZHANG Qian-Yuan, ZHAO Wen-Jing, YANG Na-Juan

. 2010, 23(5):  102. 

Abstract ( 1632 )   PDF (725KB) ( 1020 )  

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An adaptive mage fire detection algorithm is presented.The kernel function is chosen with the effect of sample data in carful consideration,and corrected by the conformal transformation method of information geometry.Then the corrected function is used to train the SVM to identify fire.The experiment results show that this algorithm improves the classification precision of fire image and accuracy of fire reorganization.

Visualization of Transitive Closure of a Binary Relation

WANG Zhong-Yi

. 2010, 23(5):  105. 

Abstract ( 996 )   PDF (565KB) ( 797 )  

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According to the number of the vertices and the relation matrix of a binary relation given by a user,the relation matrix of transitive closure of a binary relation is found using the power operator,addition operator and 0,1 transformation.With the help of VB,the relative operator is realized and the relation graph of the binary relation and its transitive closure is drawn.The method for drawing an arc is not provided in VB directly,and therefore the author chooses a point in the line between vertex i and vertex j by definite proportion,and then adopts appropriate offset to draw the arrows with a desirable effect.

Study of Specialty Features of Software Engineering at Universities of Finance and Economics

LI Cui, MA Jun

. 2010, 23(5):  107. 

Abstract ( 1341 )   PDF (552KB) ( 819 )  

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A characteristic software engineering major at the university of finance and economics requires its organic combination with the advantageous courses of economics and management.The emphasis on the dynamic establishment of the course system and the active exploration of major characteristics based on the clear definition of the specialty orientation and training target play a decisive role in the cultivation of various expertise with solid professional knowledge of software engineering,stronger software engineering practice ability and software engineering management ability.It requires the joint effort of all universities of finance and economics to find out how to exert the software engineering characteristic.

Research into Network Teaching Model Based on Military College Network Teaching Platform

YANG Mei, YE Xue-Mei, CAI Yan-Ning

. 2010, 23(5):  110. 

Abstract ( 1592 )   PDF (658KB) ( 789 )  

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This article introduces the present status of network teaching in China's military colleges,and proposes the planning and teaching methods for network teaching based on military college network teaching platform,and discusses the teaching models for military cadets based such a platform.

Design of a Test Question Database and Test Paper Generation System for Foundation Courses of the Computer Science

ZHENG Kai-Dong

. 2010, 23(5):  113. 

Abstract ( 1249 )   PDF (641KB) ( 1123 )  

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This paper describes the development of a test question database and paper generation system for Foundation Courses of the computer science using C# and the SQL Server platform based on the C/S mode.The database management covers the input and editing of questions such as multiple-choices,judgments,filling in the blanks and Questions & Answers,and the setup of their difficulty levels as well as knowledge points of every chapter.The generation of test papers begins with the setup of the amount,difficulty levels and marks for various types of questions,and then these questions are either added to the test paper by the user,or chosen from the database randomly to generate a test paper of the word document.

Design and Application of the Computer Network Lab

WANG Zhi-Wen, XIA Qin, CHEN Yan

. 2010, 23(5):  115. 

Abstract ( 1401 )   PDF (678KB) ( 854 )  

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According to the goal of experiment teaching for computer networks,a two-phase lab architecture is presented by combining design with application.It is concerned more about the content,structure and type for lab teaching in the design phase.The three principles on lab design are given.In the application phase,experience on resource,environment,process controlling and mark checking are introduced.The overall procedures for designing and applying the lab of the constructing network are demonstrated with a practical example.

Design of an Open Test System Based on SOA

HE Ju-Hou, HE Xiu-Qing

. 2010, 23(5):  119. 

Abstract ( 1298 )   PDF (519KB) ( 1018 )  

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Through an analysis of existing test systems,a new open test system based on the SOA architecture is presented.The design of and relations between its main functional modules are discussed,and the logical relationship between test content,test method and the combined web services are given.The stable running of the implemented test system proves the feasibility of this design.

Research on Linux Users Management

WANG Yan-Li

. 2010, 23(5):  122. 

Abstract ( 1321 )   PDF (511KB) ( 827 )  

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With its high stability and reliability,the multi-user,multi-tasking operating system of Linux has found wide applications in web servers.User management is of great importance due to the access of multiple users and groups.This article discusses how to create,modify,and delete users or groups,as well as how to limit user disk space,and special privileges to the general user settings and other aspects,and finally comes up with a number of commonly used methods.

Study of Integration of E-government Systems

GUO Jin-Sheng

. 2010, 23(5):  124. 

Abstract ( 1411 )   PDF (531KB) ( 847 )  

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With the rapid development and application of information technology in association with diverse technologies,complex application and distributed calculation,many application systems have been built up either on the distributed network or with a variety of heterogeneous resources.The information systems of e-government sectors are mostly developed using different tools,at different development platforms,during different periods and by different developers.This will inevitably bring great inconvenience to the future applications of associated integration.In order to ensure data consistency and improve data sharing,one need to create a data exchange platform covering a variety of heterogeneous systems.This paper,through in-depth research and analysis,proposes specific technical solutions to the integration of multiple information systems.