Computer and Modernization

Solving Congruent Circle Packing Problem Based on Improved Differential Evolution Algorithm

LU You-bing;GENG Huan-tong;ZHANG Ming;LIU Jing-fa

2012, 1(6): 1-4,22. doi:10.3969/j.issn.1006-2475.2012.06.001

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Congruent circle packing problem is one of the complex combination optimization problems with strong constraint. Aiming at the characteristics and difficulties of strong constraints, this paper proposes a method to solve the problem by improving the traditional differential evolution algorithm. The improved algorithm uses the effective solution space to improve the mutation of differential evolution, and uses the stochastic ranking mechanism to improve the selection of differential evolution. A lot of experiments have been done and prove that the result of the proposed algorithm is about less than 1% with the current optimal value, so the evolutionary computation is feasible in solving the congruent circle packing problem. At the same time, evolution algorithm is of good convergence, thus there will be a very good application in other strong constraint complex optimization problems.

Analysis of RF Electromagnetic Compatibility Prediction Among UAV Airborne Communication Equipments

ZHAO Yi-chi;SONG Zu-xun;LI Heng-bo

2012, 1(6): 5-8,26. doi:10.3969/j.issn.1006-2475.2012.06.002

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As the internal space of UAV is limited and the equipments are closely installed, the electromagnetic environment of UAV system is fairly complex and the deteriorative electromagnetic environment causes serious interferences among different equipments. Therefore, electromagnetic compatibility prediction is a very effective means to ensure the electromagnetic compatibility among the UAV airborne communication equipments. According to the characteristics of UAV, an interference margin analysis method is proposed, which is fit for the RF electromagnetic compatibility prediction among the UAV airborne communication equipments. The effectiveness of this method is verified by the mathematical model of the airborne equipments about frequency and amplitude forecasting, which provides an effective solution for analyzing the RF electromagnetic compatibility among airborne communication equipments.

Research on Teaching Quality Assessment in Military Academy Based on Multilevel Fuzzy Integrated Evaluation

SU Tao;LI Lian;LI Wen-qiang

2012, 1(6): 9-12. doi:10.3969/j.issn.1006-2475.2012.06.003

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Aiming at the problem of teaching quality assessment in military academy, this paper establishes an evaluation index system of teaching quality, gives a multilevel fuzzy integrated evaluation model, realizes the evaluation of teaching quality through the establishment of factor set, weight set, pre-evaluation set, multilevel fuzzy integrated evaluation and normalization.

Research on Aided Decision System of Internet Public Opinion Based on CBR

CHEN Xiang;HONG Fu-jin;ZHANG Xian-kun

2012, 1(6): 13-16. doi:10.3969/j.issn.1006-2475.2012.06.004

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In order to meet the need of monitoring and aided decision of internet public opinion, a case-based reasoning (CBR) framework for aided decision system of internet public opinion is proposed. Firstly, a survey of study on internet public opinion is made, and the significance of research for aided decision system of internet public opinion based on CBR is given; secondly, the workflow of aided decision system of internet public opinion based on CBR is analyzed, and the framework for aided decision system of internet public opinion based on CBR is proposed; then the key elements of aided decision system of internet public opinion based on CBR are analyzed, such as case representation and case retrieval, and the implementation methods of them are given in detail; finally, a prototype system based on the above is shown, and experimental results show that it is efficient to realize the aided decisions with this system.

A New Self-balancing SDPSO Algorithm for Solving University Path Problem

FANG Xin

2012, 1(6): 17-19,3. doi:10.3969/j.issn.1006-2475.2012.06.005

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According to PSO algorithm and using actual university geographic coordinates, taking discrete PSO algorithm as the core and combining with combinatorial optimization TSP, the paper proposes a new self-balancing mechanism to solve the university shortest path as SDPSO. System development uses Visual Studio 2005, MapInfo8.0, MapX5.0 to get algorithm result. Experimental results show that SDPSO not only can solve actual path problem, but also has better self-balancing search capability, the original performance is improved.

Multi-parameter Kinematic Model of Flexible Coordinate Measuring Machine

LI Jie;YU Lian-dong

2012, 1(6): 20-22. doi:10.3969/j.issn.1006-2475.2012.06.006

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Flexible coordinate measuring machine (FCMM) is a typical non-orthogonal coordinate measuring instrument developed in recent 30 years. In order to improve the measurement accuracy, the paper studies the joint shaking of FCMM and proposes a multi-parameter model combined with the DH model. This modeling method provides the theoretical basis for further studying FCMM.

Application of Association Rule Algorithm in Automotive Parts Failure Analysis System

LI Li;HAN Xian-yu;LIU Hong-jiang

2012, 1(6): 23-26. doi:10.3969/j.issn.1006-2475.2012.06.007

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On the basis of the theory of association rule data mining algorithm, this thesis analyzes the merits and defects of classic association rule algorithm——Apriori algorithm, then uses a new algorithm——Power Set to ameliorate the defects of Apriori. At last, the PS algorithm is applied to the automotive parts failure analysis system. It is meaningful to shorten the time of failure feedback and elimination.

Study on Fault Diagnosis in Analog Circuits Based on Frequency Characteristics

HU Hai-tao;LI Zhi-hua

2012, 1(6): 27-30. doi:10.3969/j.issn.1006-2475.2012.06.008

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Analog circuit has its tolerance on component parameters, continuous response and nonlinearity, and the limitation of the number of test points, it is difficult to achieve expected results in practical engineering based on classical circuit fault diagnosis. While neural network has the characteristics of fault tolerance, generalization ability and non-linear processing, this paper extracts the fault feature in radar circuit rapidly and validly, constructs the samples of neural network, and solves the problems in fault diagnosis of analog circuits with frequency characteristics of circuits.

Application Research on Fuzzy Clustering in Quality Assessment of Information Technology Vendors

HE Wen-jin;GU Hao-min;LI Zhi;HU Chuan-sheng

2012, 1(6): 31-33. doi:10.3969/j.issn.1006-2475.2012.06.009

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Aiming at the imperfection of quality evaluation of information technology vendors for power supply enterprises, taking the vendors’ evaluation and analysis as platform, this paper studies on how to use the data mining technology to evaluate the vendors. The evaluation data of vendors is mined effectively to provide model and method support for the quality evaluation classification of vendors by using the maximum-minimum method to establish similar matrix, and the transitive closure method for clustering analysis. Experimental results show that the model is simple, effective, and can reflect the quality level of vendors more objectively and truly.

Research on Problem of Dispatching Invigilator Teachers of Senior School Entrance Examination Based on Mosaicing Method

WANG Yao-ling;LI Shao-peng;HE Xing-heng;FAN Hong-wei;GUO Song-lin

2012, 1(6): 34-36,4. doi:10.3969/j.issn.1006-2475.2012.06.010

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The complexity of the automatic dispatch of the examiner teachers of the senior middle school entrance examination is equivalent to NP-hard problem. To solve practical problems, the paper tries to use a mosaic approach to demand an idea of suboptimal solutions. Based on this idea, a scheduling algorithm of the invigilator teachers of the senior middle school entrance examination is designed, and the satisfactory results are obtained.

Application Research on Algorithm Design Methods Based on Recursion Technique

ZHANG Yuan;YANG Qing-hong;HU Hao

2012, 1(6): 37-39. doi:10.3969/j.issn.1006-2475.2012.06.011

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Algorithm is the core of computer science. Algorithm design is very important for the development of correct and efficient software. The algorithm design method based on recursion technique can ensure the reliability of the algorithm and effectively improve the implementation efficiency by formal development. With the derivation of two examples, this article detailedly introduces the formal developing process of algorithm program by the algorithm design method based on recursion technique.

Detection and Match of PCB Mark Based on Pair-wise Geometrical Histogram

SU Jian-xin;YAO Jian-min;GUO Tai-liang;LIN Zhi-xian

2012, 1(6): 43-46. doi:10.3969/j.issn.1006-2475.2012.06.013

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Aiming at the low speed and match rate of the moment method and template match method, which have been used in the detection of PCB marks for a long time, and for the robustness of the image shapes, this article proposes a method that uses Freeman chain code to extract the contours of images and vertex detection algorithm to simplify the vertexes of the contours. Finally the pair-wise geometrical histograms whose rotation invariance is applied in the detection and match of PCB mark are generated by these vertexes. The experimental results using this method indicate that the comprehensive correct match rate is up to 96%.

Research on Aviation Parts Surface Scratches Detection System Based on Machine Vision

QIAO Wen-zhi;MIAO Jun

2012, 1(6): 47-49,5. doi:10.3969/j.issn.1006-2475.2012.06.014

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To improve the production quality, it is important to develop a high precision and strong maneuverability aviation parts surface inspection system. This paper presents a novel parts surface scratches detection system based on machine vision, which includes hardware and software components. The algorithm process of the software component is focused on and discussed, and a practical scheme is presented. The experimental results show that the proposed system is of a strong applicability to practical production.

Rendering-based Video Identification of Power Plant Analog Measuring Instrument

LUO Xiao-ling;ZHANG Bo

2012, 1(6): 50-53. doi:10.3969/j.issn.1006-2475.2012.06.015

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As the analog measuring instrument is easy to use, cost low, performance is stable and its structure is simple, it has been used for a long time in power plant’s water and gas systems. This paper presents a rendering-based video identification method of analog measuring instrument. The basic idea is using synthetic image which is generated by rendering technology to approach the observation image. When the distance between the synthetic image and the observation image is the shortest, the model is made as the result of identification.

Study and Application of Three-dimensional Visualization of Remote Sensing Images Based on ArcScene

WANG Xiao-li;MA Da-xi

2012, 1(6): 54-57. doi:10.3969/j.issn.1006-2475.2012.06.016

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The significance and current status of the remote sensing images’ three-dimensional visualization are analyzed, and the methods and technical processes of remote sensing images’ three-dimensional visualization based on ArcScene are discussed. With the Tingri County, Shigatse Tibet Autonomous region’s TM remote sensing image, SRTM DEM data, and the latitude and longitude coordinates of the Tingri County remote sensing measurement site, Tingri County three-dimensional images are produced by the ArcScene. As the basic information of the three-dimensional, the images are useful for topographic survey and geographic analysis of Tingri County, Shigatse Tibet Autonomous region. Moreover, the 3S technology is promoted by the three-dimensional terrain visualization via combing the remote sensing and geographic information system.

Study of JPEG Image Coding Based on VC++6.0

LI Yi;LI Shan-shan

2012, 1(6): 58-61. doi:10.3969/j.issn.1006-2475.2012.06.017

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Structures and characteristics of JPEG image compression coding are studied in depth, whose theoretical background and application fields are analyzed. Software of JPEG image compression with obvious advantages over others is developed by using VC++6.0 with little space, fast computing and high practicality.

Design of Seat Statistics System Based on ZigBee Wireless Technology

ZHANG Si-jun;XU Dong-dong;WANG Le-le;LU Zhen-yu

2012, 1(6): 62-65. doi:10.3969/j.issn.1006-2475.2012.06.018

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Against the technology of seat statistics (attendance statistics) system on the market is not relatively mature and of wide application, this paper presents a new application direction based on ZigBee wireless data collection technology. Wireless sensor networks technology is applied in this system to construct a seat information statistics system which consists of many wireless sensor nodes and a center node. By combining sensor technology, microprocessor technology and wireless communication technology, the system can realize the functions of pressure signal’s acquisition, fusion and transmission. This system has the advantages of simple operation, especially in public transportation, subway, study room, lecture hall, library, stadiums and other public occasions and has broad application prospect.

Design of Product Information Management System Based on Workflow

LIU Ze-ling;HE Bin

2012, 1(6): 66-68,1. doi:10.3969/j.issn.1006-2475.2012.06.019

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To achieve the management, integration and sharing of the product information involved in the activities of manufacturing enterprise, such as research, development, production and management, a generic product information management system based on workflow is established. Based on four manufacturing workflow element models, an integrated product information management system is developed by using electronic warehouse technology and the file’s checking in/out operation. Practice shows that the system can achieve the integration and sharing of the product information between different departments within the manufacturing enterprise, and support product lifecycle’s information management as well.

Design and Implementation of Tourist Geographic Information System Based on ASP and WebGIS

LI Xin-ying;JIANG Wen-bo;CHEN Xian-jun

2012, 1(6): 69-72. doi:10.3969/j.issn.1006-2475.2012.06.020

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With the development of tourism, the realization of tour information digital management has become increasingly important. According to the characteristics of WebGIS and the function structure of TGIS, Sanya tourism geographic information system based on ASP and WebGIS is built from the reality of Sanya tourism. With the powerful spatial query function of GIS and bus analysis and intelligent decision analysis, and other functions, the system is of great significance to promote tourism informatization in Sanya and Hainan.

Design and Implementation of Collection and Management System for House Property Tax and Land Use Tax

YU Bin;LI Hai-bo

2012, 1(6): 73-76. doi:10.3969/j.issn.1006-2475.2012.06.021

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In order to intensify tax collection and management on house property tax and land use tax of cities and towns, and to improve the level of tax source management by using information method, this paper introduces how to build the tax collection and management system for house property tax and land use tax based on ASP.NET technology. Based on practice, this paper sets out the necessity and the total way of the build of collection and management system from technique and function. It also emphasizes the requirement analysis and system design. The collection and management system is helpful to upgrade the management levels of local tax department.

Design and Implementation of Nursing Home Management System Based on Internet of Things

WANG Zhen;LIU Zhi-bin

2012, 1(6): 77-80. doi:10.3969/j.issn.1006-2475.2012.06.022

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This article introduces the various functions of nursing home management system based on Internet of things, describes the RFID personnel positioning principle, the fall detection principle, the principle of health monitoring sensors and their implementation. Through inputting the identification number of elderly and other information in RFID tag, when the elderly carries it and passes a checkpoint, the system can determine the position of the elderly, and uses gravity acceleration sensor to collect the acceleration waveform as the basis for fall detection.

Development of Multi-sensor Information Measurement Apparatus Based on IPv6

YE Ting-dong

2012, 1(6): 81-84,8. doi:10.3969/j.issn.1006-2475.2012.06.023

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Aiming at the needs for measurement of multi-dimension information in industry environment and application requirement of Internet of things technology, the paper develops a general multi-sensor information measurement apparatus based on IPv6. The apparatus uses DSP-ARM processor as the kernel, it realizes the design of IPv6 network communication with the ARM’s embedded EMIT, integrated network communication chip LXT971 and Socket network programming. And its DSP chip uses interpolation decoupling technology to realize the accurate measurement of sensing information. Experiment shows that, the apparatus meets networking measurement requirement of multi-sensor information in industry environment.

Analysis of NCS Network Protocol

CHEN Dong-li;TAN Guan-zheng;WU Gao-liang

2012, 1(6): 85-88. doi:10.3969/j.issn.1006-2475.2012.06.024

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Considering the serious systematic distortion when the networked control systems (NCS) have different network loading, this paper introduces a new solution of using suitable network protocols to improve the performance of system, gives a general instruction of the characteristics of four types of network protocols which are Ethernet, CAN, Round Robin and Switched Ethernet, then confirms the different protocols which have different network performances when they are applied to low loading and high loading in experiment by establishing the model of NCS, writing code, adjusting network interference share and choosing different network protocols. This paper comes to a conclusion that networked control systems have better dynamic and stability performance by choosing proper network protocols.

Design and Realization of Digital Down-conversion SDR-PHS System Based on FPGA

ZHAO Liang

2012, 1(6): 89-94,9. doi:10.3969/j.issn.1006-2475.2012.06.025

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The software defined radio (SDR) technology has changed traditional hardware radio platform, which is a flexible software defined radio platform and supports different wireless communication standards and system requirements. The field programmable gate array (FPGA) plays an increasingly important role in flexible SDR design due to its flexible programming features, increasing processing capacity and scale of logical resources. Starting from the design idea of software defined radio, this paper describes the design and realization of a digital down-conversion SDR system based on FPGA used in personal handyphone system (PHS), and elaborates a kind of low cost SDR realization based on hard limit and RSSI amplitude restore. Simulation results verify the validity and reliability of this method.

Study for Sequence-based Localization Based on Virtual Anchor Nodes

XIAO Lin;SHAN Zhi-long

2012, 1(6): 95-98. doi:10.3969/j.issn.1006-2475.2012.06.026

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For the purpose to find a solution to lessen the algorithmic complexity of newly proposed sequence-based localization algorithm, a novel algorithm based on virtual anchor nodes is proposed. This method can reduce the amount of classifications for referential anchor nodes through establishing virtual anchor nodes. Accordingly, it can cut time consumed for positioning. Computer simulation indicates that the new method is more accurate than sequence-based localization algorithm and it can take less time for positioning.

A Super Node Selection Algorithm Research in Peer-to-Peer Networks

WANG Xiu-juan;HONG Jun

2012, 1(6): 99-101,. doi:10.3969/j.issn.1006-2475.2012.06.027

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Peer-to-peer system does not consider combining the overlay with physical network, which would cause a serious topology mismatching between the P2P logical overlay network and the physical network, and that increases the delay between the nodes. About this problem, this paper proposes the super-node selection mechanism based on district partition. This mechanism divides P2P into several regions according to physical position to ensure that nodes are close. Simulation results show that it can decrease network search delay lower, it is effective and scalable.

Path Optimization for WSN Based on Improved Ant Colony Algorithm

YANG Xin-feng;LIU Ke-cheng

2012, 1(6): 102-105. doi:10.3969/j.issn.1006-2475.2012.06.028

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Against path optimization problem for wireless sensor network (WSN), this paper proposes a path optimization for WSN based on improved ant colony algorithm by combining with the advantages of genetic algorithm and ant colony algorithm and introducing the genetic algorithm selection, crossover and mutation operators into ant colony algorithm to improve the algorithm’s capability of convergence and global search. Simulation experimental results show that the improved ant colony algorithm improves WSN routing efficiency and success rate, prolongs the survival time of network and improves the overall network performance.

RADIUS Authentication Principle and Its Analysis Based on 802.1x Protocol

XU Bo;ZHANG Qin-hui

2012, 1(6): 106-108. doi:10.3969/j.issn.1006-2475.2012.06.029

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IEEE 802.1x is a port-based authentication protocol. It is used as an authentication method or strategy for broadband users. This article briefly describes the basic concepts and principles of the 802.1x protocol and RADIUS protocol, analyzes the application of RADIUS protocol based on the 802.1x in the certification of broadband, gives the RADIUS workflow and points out the advantages and disadvantages.

An Energy-saving Cluster-based Routing Protocol for Wireless Mesh Network

LIU Yi-jun

2012, 1(6): 109-112. doi:10.3969/j.issn.1006-2475.2012.06.030

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Part of the wireless Mesh network nodes are powered by the battery, and when wireless Mesh network is widely applied into wireless access, energy-saving is a significant work. This paper puts forward an energy-saving cluster-based routing protocol for wireless Mesh network (ECRPWMN), it firstly separates the network into some clusters, and runs the table-driven routing between the clusters; how much routing work the node in the cluster does is decided by how much residual energy it has, so as to achieve a balance of energy consumption. The simulation shows ECRPWMN can effectively save energy, balance network load and extend the network’s lifetime.

Importance of QoS in Home Network

WAN Yue-hui;YU Jin-ke

2012, 1(6): 113-117. doi:10.3969/j.issn.1006-2475.2012.06.031

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The paper discusses the importance of QoS in home network from the mode of wired/wireless networking. Based on some of the basic functions, it describes QoS classification and some problems of current home network. At the same time, it uses QoS technology of home gateway to solve some questions of QoS in home network.

Study on QoS Solution for Campus Networks

CHEN Jia-yi;WANG Wen-juan

2012, 1(6): 118-121. doi:10.3969/j.issn.1006-2475.2012.06.032

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With the development of network technology, the increasing number of network users and the implementation of all kinds of large-scale real-time multimedia applications in network, campus network plays an increasingly significant role in the production and development process of enterprises and institutions, such as universities, hospitals and companies. Meanwhile, the network applications request for higher quality of network service. This paper introduces the main strategies of QoS solution for campus network, analyzes the DiffServ model, which adjusts the network resources by classifying and policy-control of correspondence data packets for campus networks, and investigates the realization of DiffServ model, so that it guarantees the QoS for campus networks.

An Efficient Multicast Routing Algorithm for Cost Optimization in Ad Hoc Network

XIAO Jian-xin;HE Yao

2012, 1(6): 122-124,. doi:10.3969/j.issn.1006-2475.2012.06.033

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Ad Hoc wireless network has the flexible, fast installment without the impact of cable networks, and has broad prospects for development. With the development of wireless communications technology, multicast applications widespread increasingly, multicast technology is becoming an important research topic. This paper studies the multicast routing problem in Ad Hoc network. For the complexity of existing algorithms and the difficulty of applying to the real world, the paper presents an efficient and effective multicast routing algorithm DCMR. First, the algorithm finds enough the delay constraint satisfied paths. Then, the path would be sorted by cost, and be selected in turn to cover all the receiving node, until the multicast tree is established. Finally, the validity of the multicast tree would be checked, removing the routing loop which may exist. Simulation results show that the tree costs generated by DCMR algorithm is slightly worse than KPP algorithm. But, for algorithm execution time, compared with KPP, DCMR has decreased 43.9%.

An Update Strategy for Minimum Spanning Tree of Net

CHENG Yuan;

2012, 1(6): 125-130. doi:10.3969/j.issn.1006-2475.2012.06.034

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Solving the problem of minimum spanning tree has been widely used to solve searching issues in reality. However, the node of a connected graph net is often changed, and, once it's changed, the traditional algorithm has to recalculate the minimum spanning tree. But, even the graph node changes, not all of minimum spanning tree will be changed, which results in unnecessary waste. This article is aimed at improving Kruskal algorithm and Prim algorithm, which can update the minimum spanning tree when the graph changes without recalculating.

Secondary Development and Utilization of Long SMS Platform Based on Telecommunication API

LI Tong;LI Pu-zhe;XIANG Fu-lin

2012, 1(6): 134-137. doi:10.3969/j.issn.1006-2475.2012.06.036

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With the popularity of mobile phones, more and more information will be received as text messages. The telecommunication API is used to extract the scores of college students from SQL database, and the messaging interface of the ability platform is called to achieve Web functions of sending text messages, which are promptly released to the guardian phone, so that schools and parents work together to monitor student learning. This article firstly introduces the basic principles of telecommunication API and the interface specification, combines the actual development needs to modify the API JSON format; secondly, uses Visual Studio 2008 to build a software platform, which connects Microsoft SQL Server database; finally, extracts information from the database, uses the “event” in Visual Studio 2008 to trigger API interface to accurately send the information to the target phone. The whole process is tested and is satisfied to the development requirements.

Design and Implementation of Intelligent Wake-up Light System Controlled by Dual MCU

YU Hua-fang;ZHOU Zhao-feng;CHEN Xi-bo;YANG Lu-xiu;CHEN Hu

2012, 1(6): 138-140,. doi:10.3969/j.issn.1006-2475.2012.06.037

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How to design and implement a natural wake-up light system, which is different from the traditional ringing alarm, based on dual MCU (Micro Controller Unit, MCU) and the DS1302 clock chip, is described in detail. It can make people sleep more pleasantly and wake more peacefully, refreshed and re-energized.

Design of GPS Navigation System Based on ARM9

Gulimila KEZIERBIEKE;ZHANG Jing-jing;LI Yong-wei

2012, 1(6): 141-143. doi:10.3969/j.issn.1006-2475.2012.06.038

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This paper discusses a kind of design method that combines S3C2440 and GPS module to realize the GPS navigation terminating machine, which needs to establish environment of embedded development ARM9 and install Linux operating system. The key technologies include: extraction of RMC statements, collection of GPS data, Qt programming and matching algorithm of electronic maps and GPS data, in order to display and move the GPS navigation maps for achieving the purpose of real-time location.

Research on Porting USB Device Driver Based on Linux

ZHANG Xuan

2012, 1(6): 144-146,. doi:10.3969/j.issn.1006-2475.2012.06.039

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By analyzing the USB-skeleton driver provided by the kernel of Linux 2.6, the USB interfaces based on LM9833 scanner control chip are successfully driven. The registers in the LM9833 scanner control chip can be correctly written and read.

An Audio Acquisition and Release System Based on DSP

XIAO Qi-yang;FANG Yuan

2012, 1(6): 147-151. doi:10.3969/j.issn.1006-2475.2012.06.040

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An audio signal processing system based on DSP is introduced. The system adopts TI's low power consumption DSP TMS320VC5509A as the main processor, and TLV320AIC23 as the audio codec chip. Therefore, the system's hardware platform and software design are completed based on them, which can be used as a universal platform for other audio signal processing. The paper expounds in detail the method of interface that connects codec chip with DSP. At last, it provides an example of data transmission based on DMA interruption, which upgrades procession speed largely.

Development of E-learning Database System Based on MVC

LI Dong-yuan;ZHOU Wen-hui;MO Jian-bin

2012, 1(6): 156-160. doi:10.3969/j.issn.1006-2475.2012.06.042

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For E-learning system with features such as interactive, real-time, concurrency, MVC hierarchical design model is used so that it can adapt to change needs and extend in the future. Independent Web server HTTP request for pages is processed, video file streaming into FMS server and relieving pressure on the data processing of a single server, and video transmission of large amount of data will not affect the user's website. Focused analysis on the process of database development in the principles of database design, database development, and database tables, database connection method is included. Finally test on function and stress of the system is carried out, results show that this system can support large user populations and high concurrency and instant online learning exchange. The system is fully functional, usable. Future application will include online education teaching, training, and management.

Study on Deep Web Search Interface

QIAN Cheng;YANG Xiao-lan

2012, 1(6): 161-164,. doi:10.3969/j.issn.1006-2475.2012.06.043

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Deep Web search interface is the interface of Web database. It is essential for the integration of Deep Web databases. According to the structural characteristics of the Web form, search interface is defined. For non-submission query method, some of the rules as defined in the Deep Web search interface are given. The submission query method is proposed, which finds out the page containing the search interface with the features of the link properties. The Web pages are classified with the C4.5 decision tree algorithm, and the Deep Web search interface system is realized by using Java.

Research on Lossless Data Compression Algorithm for Historical Data of Real-time Database

YANG Yong-jun;XU Jiang;SHU Yi;XU Shuai

2012, 1(6): 165-168. doi:10.3969/j.issn.1006-2475.2012.06.044

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Real-time database has been widely applied in industrial process control field, in which historical data costs vast space. In order to increase the capacity of database while keeping the characteristic of high speed, data compression technology is adopted into real-time database. This paper designs a new lossless data compression algorithm for historical data of real-time database which is based on LZ algorithm. The experiments indicate that this algorithm achieves small amount of computation, high compression ratio and fast compression speed.

Research on Method of PDF Document Usage Control

CHEN Ju-hua;TU Dong-yang;RUAN Wen-jiang

2012, 1(6): 169-171,. doi:10.3969/j.issn.1006-2475.2012.06.045

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The technology of digital rights management is a new kind of information secure technology developed in recent years, which realizes protection of digital content and rights of copyright owners by digital rights management and technology of copy prevention. The core ideas of digital rights management are based on right protection and usage control of digital resources. This paper discusses the key technology of protection system of copyright used to protect PDF document and adaptability of it, studies the framework of PDF document and the security mechanism, analyzes PDF document usage control mechanism, usage control method and implementation tool.

A Digital Watermarking Algorithm Based on Discrete Cosine Transform

LAI Li;DING Jin-song

2012, 1(6): 172-175. doi:10.3969/j.issn.1006-2475.2012.06.046

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This article researches on the algorithm of embedding digital watermarking in static gray images based on discrete cosine transformation (DCT), and focuses on the ways and means of embedding watermarking. The algorithmic principle is dividing the watermarking and original images into blocks, converting the blocks to DCT domain, and embedding them correspondently. However, the watermarking must be embedded in a certain place, that is embedding the watermarking to images in some of the intermediate frequency near low frequency part. The purpose is to make the embedded watermarking better hidden and resistant to attack. Experimental results show that under certain conditions, the watermarking can be well hidden in the original image with a certain degree of resistance to attack of smear or shear.

Analysis of Key Technologies on Cloud Computing Security

GUO Rui-peng

2012, 1(6): 176-178,. doi:10.3969/j.issn.1006-2475.2012.06.047

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The emergence of cloud computing enables the enterprises and individuals through the network to use computing resources and storage resources conveniently, cloud computing in data security issues are also increasingly attracted widespread attention. This paper discusses the objectives and requirements of cloud computing security, and analyzes the cloud computing user access, encryption technology, access control, virtualization security and other critical security technologies.

Study on Method of Adjusting Color Temperature Continuously Based on Three Primary Lighting Sources

CHEN Dong-ling;LIN Zhi-xian

2012, 1(6): 179-182,. doi:10.3969/j.issn.1006-2475.2012.06.048

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In order to improve the comfort degree of indoor lighting source, an implementation method of color temperature adjusting lighting system is proposed, which meets the people’s demand for adjusting color temperature and brightness according to their physical and psychological needs in different environments. According to the coordinates of red, green, blue colors and blackbody track, the desired brightness of the three primary colors which matches the target color temperature on the basis of the light mixing arithmetic is calculated. Then the gray data is acquired by PAM or PWM gray modulation mode, and the feasibility of the method is verified by experiments of several typical color temperatures, and finally the causes of errors are analyzed. The experiment results show that this method can not only realize the matching of target color temperature of different brightness, but also the color temperature and the brightness can be modulated on a great scale.

Construction and Application of Numerical Simulation Platform for Turbulent Combustion Based on Cluster

HUANG Yu-da;WANG Jun-min;SUN Zhao-guo;WANG Yi-ran

2012, 1(6): 186-190. doi:10.3969/j.issn.1006-2475.2012.06.050

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The characters of the cluster system and its software and hardware configuration environment are first described, then a computational fluid dynamics cluster system based on MPI and the open source platform OpenFOAM is constructed, and the performance and parallel efficiency of the cluster system are tested and analyzed. The numerical simulation and parallel computing for turbulent combustion flow reactor are achieved by using this cluster system and the three-dimensional flow field simulation results are obtained. The experiment results show that the cluster system for numerical simulation of turbulent combustion can improve the computational efficiency significantly and get better simulation results.

Design and Implementation of Cloud Operation and Maintenance Monitoring Model Based on Hadoop

ZHANG Jian;GENG Huan-tong;LU You-bing;

2012, 1(6): 191-194,. doi:10.3969/j.issn.1006-2475.2012.06.051

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With the rising of enterprise informatization demands in the production of real-time monitoring, massive storage and scientific analysis and decision, the operation and maintenance monitoring systems have gradually become the main management tools. By using the latest cloud computing technology, this paper designs and builds a cloud operation and maintenance monitoring system, which is easy to expand for data scale, quick for processing speed, high for security, and low for cost. And in the light of the shortcomings of slow response to the real-time extraction of massive and historical monitoring data in operation and maintenance control system, the paper designs and implements a distributed massive data processing model based on Hadoop. Simulation experiments show that the massive data extraction efficiency of the cloud monitoring system based on Hadoop is superior to traditional methods, and the advantage is more obvious with the rapid growth of the amount of data.

Research on Hadoop’s Usage in VOD System

LIU Tong-ge;LIU Bo;YANG Zhi-wen

2012, 1(6): 195-199. doi:10.3969/j.issn.1006-2475.2012.06.052

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Firstly, this paper simply introduces the current VOD system and points out the shortages of the VOD system storage architecture, then introduces Hadoop, analyzes HDFS storage mechanism and characteristics, points out the advantage of the architecture that stores video files in Hadoop cluster. At last, the paper introduces a prototype VOD system based on Hadoop, summarizes the advantages of the system, and gives a further research plan.

Research and Design for Implementation of Multi-tenant Website

CAI Yan-Feng;FAN Bing-bing

2012, 1(6): 200-203. doi:10.3969/j.issn.1006-2475.2012.06.053

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The building of the traditional sites is fragmented, leading much duplicated construction and high maintenance costs and other issues. This paper uses multi-tenant SaaS application, J2EE, meta data management technologies to propose multi-tenant sites framework, and key implementation technology designed to solve the multi-tenant Web design and meet the individual needs and other issues.

Application of MailMerge of Word in Visual Basic

ZHU Ke-wu

2012, 1(6): 204-207,. doi:10.3969/j.issn.1006-2475.2012.06.054

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The object of MailMerge of Word is analyzed in Visual Basic. The property values, including DataSource, DataFields and MailDocumentType, are found by researching the property and methods of MailMerge. By combining both the property values of MailMerge and Access database, Office Grading system can automatically judge MailMerge of document, and realizes the function of automatic grading.

Memory Overflow Problem and Solution of MATLAB

LIU Fang-hua;ZHANG Yong-xiang;ZHANG Guang-he

2012, 1(6): 208-211. doi:10.3969/j.issn.1006-2475.2012.06.055

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The memory overflow problem of MATLAB directly leads to the program unexpected terminated in processing of large data sets, it is one of the most difficult problems in the efficient development of MATLAB environment. This paper briefly introduces the memory limitation of MATLAB, and then analyzes the reason and background of memory overflow. Finally, it proposes two solutions for the problem.

Design and Implementation of Novelty Search Platform Based on S2Si + jQuery Framework

ZOU Yin-ma;ZHAO Zhe

2012, 1(6): 212-214,. doi:10.3969/j.issn.1006-2475.2012.06.056

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In order to improve the service level of novelty search and make the clients from time and space constraints away submit their commissions and learn about the latest progress, the novelty search agency can customize the corresponding services for their needs so as to promote its own work more standardized and scientific. At the same time, in order to have a better user experience and strong interactivity of Web application, jQuery, which is a relatively popular technique at present, is integrated into the S2Si framework. Thus, the paper establishes a technical foundation for the realization of novelty search platform.

Design and Realization of Monitoring System for Oil Well Pressure Based on Measurement Studio

LIU Zhi-dong;TANG Guan-bao

2012, 1(6): 215-217,. doi:10.3969/j.issn.1006-2475.2012.06.057

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For high efficiency and security of oil producing, the real-time monitoring of oil well pressure is important. In this paper, with the flexibility of ActiveX, VS.NET combined with Measurement Studio is used to develop the real-time monitoring system. Through the serial ports RS485, the oil well pressure obtained by the pressure sensor is conveyed to the system. The system implements a real-time display of the pressure value in the virtual instrument, paints a real-time pressure curve, and stores the pressure value. Querying and printing the historical pressure value is provided by the system. Microsoft Speech SDK is used to develop the sound alarming function for the abnormal condition.

Implementation of Dynamic News List in Flash Website Based on ASP.NET

JIANG Li-hua;Ren Yi

2012, 1(6): 218-220. doi:10.3969/j.issn.1006-2475.2012.06.058

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Flash website has become an important form in Internet and will be more and more popular. This article, using ASP.NET as the server-side technology, ActionScript for the front, and with XML, introduces the implementation of dynamic news list in Flash website.

A Selection Method for GDI+ Drawing

QIAO Zhi

2012, 1(6): 221-222. doi:10.3969/j.issn.1006-2475.2012.06.059

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In the Visual C#.NET programming environment using GDI+ graphics, such as straight line, rectangle, text and so on, all is not an instance of the class, does not have its own properties and methods, leads to very difficult to have the drawing to choose and do the next revision and application. This paper describes how to use GDI+ graphics rendering to realize the plot graph selection.

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