Computer and Modernization

A New Method of Dealing with Illegal Points in Constrained Optimization Problem

MA Chun-li;NING Bi-feng;CHU Guo-juan

2010, 1(6): 1-0002. doi:10.3969/j.issn.1006-2475.2010.06.001

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For the constrained optimization problem, based on the introduction of the individual attached to the concept of the extent feasible region, this paper proposes a new method for formulating and evaluating illegal points, and on this basis,constructs a new evaluation of the nonfeasible solution of the fitness function.

Simplification Algorithm with a Weight of Neighborhood Point Samples Based on Unorganized Point Cloud

YIN Dan;YANG Lin;WANG Sheng-chun

2010, 1(6): 3-0005. doi:10.3969/j.issn.1006-2475.2010.06.002

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This paper proposes a clustering simplification algorithm, which has a weight of neighborhood point samples. This algorithm treats the surface variation and the quantity of point samples in the neighborhood as a threshold. So the user can control the threshold to be apt to split the clusters which have more point samples and a certain curvature, and get a more suitable simplification.

Research on Particle Swarm Optimization Algorithm

LI Xin-ran

2010, 1(6): 6-0008. doi:10.3969/j.issn.1006-2475.2010.06.003

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Particle swarm optimization algorithm is put forward according to the simulation of migration of bird flight their foodsearching and the group model, and is a novel stochastic optimization algorithm which can use to solve optimization problems. The models of bird flocking and swarm actions are firstly introduced, and the fundamentals characteristics and the working mechanisms of PSO algorithm are also analyzed. Then this paper introduces the optimization strategy of particle swarm optimization including improve the convergence rate, discrete algorithms, improve overall group diversity.Finally, some suggestion on future trends and existing problems related to PSO algorithm are discussed and concluded.

Research on Scheduling Algorithm of Supporting Fairness of Queues and Security Policy

XU Pan;FENG Jing;HUANG Li-wei

2010, 1(6): 9-0012. doi:10.3969/j.issn.1006-2475.2010.06.004

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Distributed real-time system has characteristics such as dynamic, distributed and so on. In order to make it a better execution efficiency, an efficient scheduling algorithm to carry out the task scheduling is needed. This paper designs an algorithm on multi-queue scheduling supporting fairness of queues and security policy for some distributed real-time systems with security restrictions.Finally, the test results of this algorithm in the grid simulator are given.And it also compared with some other scheduling algorithm. The results show that this algorithm in the case of large tasks meets the security requirements, and realizes the fairness of queues preferably.

Multi-spectral Imaging System Spectral Reconstruction Algorithm Based on Group of Camera

SUN Zhen;SHI Chao-jian;GE Jing

2010, 1(6): 13-0016. doi:10.3969/j.issn.1006-2475.2010.06.005

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Recovery of surface spectral reflectance is impossible exclusively with conventional RGB cameras.The appearance of a captured image depends on both the illumination spectrum and the spectral reflectances of objects in the scene. Even if the illumination spectrum is known, an RGB camera provides only 3 measurements which is insufficient to recover the spectral reflectance
This paper constructs a set of multi-spectral imaging camera system, which consists of 12 DHHV1300FM cameras. And eleven len are installed with filters with different wavelengths. The paper proposes an algorithm of multi-spectral imaging system based on group of camera to recover the spectral reflectance of the scene efficiently and robustly, that combines with the advantages of using multiple spectral sources and the groups of multispectral camera. Finally, simulation verifies the validity of this system.

An Algorithm for Mining Global Frequent Item-sets Based on Distributed Database

DENG Li-jun

2010, 1(6): 17-0020. doi:10.3969/j.issn.1006-2475.2010.06.006

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Aiming at the Fast Distributed association rules Mining (FDM) algorithm which perhaps
loses some global frequent K-item sets, an improved algorithm, named as DS-CFDM, is presented
to solve the problems of FDM. The improved algorithm introduces the ideas of dual-space and
identification bit. In order to reduce the burden of network, a center site is used to coordinate
the information transmission during the implementation of the algorithm.

An Accurate and Efficient Algorithm Applied to Vehicle License Plate Location

LIU Shuang-cai

2010, 1(6): 21-0022. doi:10.3969/j.issn.1006-2475.2010.06.007

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License Plate Recognition(LPR) plays an important role in intelligent transportation system, and the license plate locating is the critical technique in the LPR. An accurate and efficient algorithm to locate vehicle license plate is proposed. The plate is firstly located by gray change which described by calculus of differences, the different types plates is processed by binary algorithm. The experiment results show efficiency and good performance of the algorithm in vehicle license plate location.

Research on Virtual Experiment System Based on Collaborative Experiment Mode

YUAN Xue-qian;WU Jia-wei

2010, 1(6): 23-0027. doi:10.3969/j.issn.1006-2475.2010.06.008

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With the rapid development of online education, the virtual experiment experiences from academic research to practical application. At the same time, the theories and methods of computersupported collaborative learning also develops greatly. This paper firstly analyzes the the development summary of the virtual experiment system and the features of collaborative experiment mode, then discusses the study of the collaborative learning mode in virtual experiment system, proposes the chief component and key technology of the virtual experiment system based on collaborative experiment mode, gives the choice of development tool, finally gives the summary and expectation.

Design of Experimental Course Selection System Based on .NET Technology

YU Li-na;ZHU Quan-shui;YE Chen-wen

2010, 1(6): 28-0031. doi:10.3969/j.issn.1006-2475.2010.06.009

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The experimental college courses have mostly used an open experimental management model. This paper discusses the network elective system development process based on .NET technology, simply describes an online elective function of the system and related technology.

Mobile Learning Platform Based on Mashup

REN Gang

2010, 1(6): 32-0035. doi:10.3969/j.issn.1006-2475.2010.06.010

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As an important feature of Web 2.0, Mashup technology can improve data value by integration. With this technology, a learning platform is built and the components, architecture and characteristics are discussed. Then the classroom response feature is added based on this platform to support the real-time feedback from students by their mobile terminals. The result shows the learning positiveness and efficiency of students is raised by this method effectively. The future researches are discussed at last.

Design and Implementation of Paperless Examination System Based on Tag-storage

HUANG Han-wen;LI Jian;GUO Li-ping;YANG Xing

2010, 1(6): 36-0039. doi:10.3969/j.issn.10062475.2010.06.011

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Because the paperless examination has a lot of characteristics ,such as convenience for managing and maintaining questions, simplicity for organizing and implementing examination, impartiality for judging papers, fairness and accuracy for results of examination, it has been chosened for course examination by many schools. This paper researches the key issues of data storage in paperless examination system, designs a custom tag-based data storage solutions, and it is applied to paperless examination system. The system has the advantages of efficiency memory, good expansibility, fast response.It will be good application value.

Design of NCRE Aided Registration System

TANG Chao-chen;NIU Qin-zhou

2010, 1(6): 40-0043. doi:10.3969/j.issn.1006-2475.2010.06.012

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Currently, many colleges or organizations are still relying on standalone registration system to collect and manage registration information of examinee for National Computer Rank Examination. This method has its disadvantages as follows: firstly, for people who work for registration, the workload is heavy and working efficiency is low; secondly, it is inconvenient for examinee. Registration on the Web is one of efficient ways to solve this problem. Hereby this paper analyzes the processes of NCRE registration and designes an aided register system based on Web for NCRE offline registration system. The result proves, it is one of the effective way to supplement standalone registration system. It lightens the workload and improves working efficiency. Also, it is convenient for examinee to register.

Hydro-ecological Data Management System Based on Component GIS Technology

LU Qian;ZHANG Jian-jun;YAN Xiu-jing;ZHANG Xue-xia;SUI Xu-hong;

2010, 1(6): 44-0047. doi:10.3969/j.issn.1006-2475.2010.06.013

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The hydro-ecological data management system based on component GIS technology has provided an information platform and scientific proof for observation station of eco-hydrologic. This paper discusses the concept of component GIS and it also establishes the hydro-ecological data management system using ArcGIS engine and programming tools C#, which is used in .NET Framework. The system can achieve the management, query, statistics and output of the eco-hydrologic data, which proviedes scientist proof for data management on observation station of hydro-ecology.

Research on Dependence of Database Being Moved

YUAN Zhi-hong;ZHOU Wen-hong

2010, 1(6): 48-0050. doi:10.3969/j.issn.1006-2475.2010.06.014

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This paper analyses the dependent relationship of basic database. Dependency covers implication and optimization database problems related to logical constraints, commonly called dependencies. It also deals with relationship between a database and other entities outside of the database. When the database is moved to another server, all of its dependencies should be carried over in order to make the relocated database run successfully. The paper examines different types of dependencies and shows how they are moved together with the database.

Key Technical Analysis and Complexity Research Testing for H.264

YUN Jing

2010, 1(6): 51-0054. doi:10.3969/j.issn.1006-2475.2010.06.015

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H.264 video coding standard is more efficiency and stability than the original coding substantially,but its computational complexity is also increased significantly.Reducing the complexity of encoding operations, improving real-time encoding, but no affecting the coding efficiency, it is necessary to make a study of the complexity of H.264. Intraprediction, inter-frame prediction, transform coding and entropy coding algorithm are improved to increase the compression ratio in H.264. This paper analyzes the above key technology in H.264, gives the complexity of modules in H.264 based on JM86. Testing results show that the complexity of H.264 encoding is mainly reflected in the inter prediction module. To speed up H.264 encoding speed, it is necessary to optimize this module.

A Blind Image Watermarking Algorithm Based on Wavelet Transform

LÜZong-bao

2010, 1(6): 55-0057. doi:10.3969/j.issn.1006-2475.2010.06.016

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An algorithm based on wavelet transform for hiding digital watermark in image is presented. In this algorithm, a 2level DWT decomposition of the original image is performed and then the important perceived factors are adopted by certain strategies as a watermark embedding regions. The watermark is embedded into the lowfrequency subband repeatedly in order to improve the accuracy of the watermark detection. Test results show the good transparency of the watermark and the good robustness of the algorithm for the best known attacks such as noise interference, image compression/clipping and other image processing actions.

Design of SFS Algorithm Based on Single Image

QIU Kai-jin

2010, 1(6): 58-0060. doi:10.3969/j.issn.1006-2475.2010.06.017

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The single 2D image is taken as the research object. Firstly color image is converted into a gray image. And then a relationship between the information of the missing third dimension and gray value is found directly. Finally the missing third dimension of surface is found through the relationship. The entire process is simple, clear, and very fast, and the results of simulation show the efficiency of the new approach.

Comparative Study for Image Fusion Techniques Based on ETM+ Remote Sensing Data

ZHENG Zhu-bin;REN Jing-li

2010, 1(6): 61-0063. doi:10.3969/j.issn.1006-2475.2010.06.018

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With the rapid development of remote sensing technology, it needs higher requirement when people interpret the surface features to the resolution of remote sensing data. This paper uses three different image fusion techniques in the study area of the ETM+ remote sensing data which makes double improvement of the spatial resolution, and carries out a comparative study
of three methods, draws some useful conclusions.

Design and Implementation of Image Real-time Eliminating Rotation System Based on Bilinear Interpolation

DENG Lin-hua;HUANG Wen-juan;HUANG Shan-jie;XIANG Yong-yuan;XU Jun

2010, 1(6): 64-0066. doi:10.3969/j.issn.1006-2475.2010.06.019

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In the electric-control system of one-meter infrared solar telescope, in order to reduce telescope’s tracking error produced by image rotation, this paper uses VC++ 6.0 as development tool, adopts software elimination method to reversely rotate corresponding angle of image which is captured from CCD, and then uses bilinear interpolation to resample the image so as to achieve realtime eliminating image rotation.

Design Method of Video Watermark Technology Based on MPEG-4

DENG Hua;ZHANG Ji-fu

2010, 1(6): 67-0070. doi:10.3969/j.issn.1006-2475.2010.06.020

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Aiming at the requirements of the copyright information required high capacity and the strong robustness based on MPEG-4, a method of video watermarking which is based on DCT domain in MPEG-4 is proposed. The algorithm synthesizes wavelet transforms, chaos theory and spread frequency technology to do the watermarking pretreatment, and chooses the watermarking embedded domain according to the texture characters of video images. The algorithm, which used for reference of the idea of LSB algorithm, embeds the watermark information into DC component in DCT domain of I-VOP. The experimental results show that the watermark has good invisibility and robustness.

Image Scrambling Algorithm and Its Implementation Based on Chaotic System

DONG Hu-sheng;LU Ping

2010, 1(6): 71-0073. doi:10.3969/j.issn.1006-2475.2010.06.021

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A digital image scrambling algorithm based on chaotic sequence is designed after the analysis of Logistic map’s features. According to the pixels’ location, subsequences are acquired from the binary sequence mapped which is from chaotic sequence generated by Logistic map, and then they are made XOR operations with the binary sequences obtained by bits expanding of pixels’ gray value, at last the image is encrypted. The key codes of the algorithm are presented in the paper. Experimental results show that the algorithm has good scrambling effect with higher efficiency and safety.

Analysis and Improvement of Otway-Rees Protocol

CHENG Ying;XIAO Mei-hua

2010, 1(6): 74-0076. doi:10.3969/j.issn.1006-2475.2010.06.022

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This paper analyzes protocol attacks for key exchange protocol Otway-Rees, gives four kinds of attacks in existence, and discusses an improved methods to improve security and secrecy availably of the protocol.

Principle of Using Windows’s Buffer Overflow

XU Da-cheng;SHI Yong

2010, 1(6): 77-0079. doi:10.3969/j.issn.1006-2475.2010.06.023

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The problem of buffer overflow is widely occurred in the software systems. This article analyses the principle of buffer overflow in detail, and introduces the general way of how to use buffer overflow.

Implementation and Application of Cryptography Experimental Teaching Website Based on ASP.NET

DUAN Xu-liang

2010, 1(6): 80-0083. doi:10.3969/j.issn.1006-2475.2010.06.024

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Cryptography is abstract and difficult to understand, more in teaching. The cryptography experiments website can reduce the understanding difficulties and achieves a telling effect. Based on the teaching reality of introduction to information security, this paper analyzes the existing problems from both teaching theory and practice, and introduces the development of a ASP.〖KG-*3〗NET website to address these issues. As well as take a RSA communication case to introduction the typical application of the system, the teaching effects based on the experiments website are also discussed.

Design and Research on X86 Platform Firewall SNMP Agent

LI Ming;GE Liang-quan;LIU Liang

2010, 1(6): 84-0086. doi:10.3969/j.issn.1006-2475.2010.06.025

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In this thesis, SNMP protocol, as well as open-source tool for Net-SNMP, based on the X86 platform, builds a complete hardware firewall SNMP agent, synthesizes various tools to verify that SNMP functions, and discusses the SNMP agent development improvements.

Driving Behavior Model of Vehicle Agents in Virtual Driving Environment

LU Hong;DING Shi-min;PAN Xiao-long;LI Gang

2010, 1(6): 87-0091. doi:10.3969/j.issn.1006-2475.2010.06.026

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A multiple-agents structure of virtual traffic environment is established. Vehicle agents’ hierarchical model of driving behavior, the sensing, decision-making and operating procedures are analyzed. With the application of fuzzy expert system, a driving behavior model of vehicle agents is established. To simulate drivers’ characteristics in real life, driver factors are added to make the virtual traffic environment in driving simulators closertolife. OpenGVS is used to generate and display the driving virtual scene interactive and in real-time. The result shows that this model can reflect diversity, randomness and fuzziness of real life driving behaviors. This model is generally effective and can provide truer and more satisfying virtual traffic scene in driving simulators.

Application of Simulation Technology in University Computer Assembly & Maintenance Curriculum

XIAO Bin

2010, 1(6): 92-0095. doi:10.3969/j.issn.1006-2475.2010.06.027

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By appling the simulation technology in the teaching of college computer assembly & maintenance curriculum， it better solves the teaching problems in current high schools and greatly improves the teaching and learning effects. This simulation technology provides a good studying and communicating platform for students.

Research on Realization of Group of Four Valves in Chemical Industry Simulation Training System

FU Chang-liang

2010, 1(6): 96-0100. doi:10.3969/j.issn.1006-2475.2010.06.028

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In order to study the principles and methods of the chemical industry simulation training system’s realization, promote its development, as to the beginning, stopping and accident handling operations of the group of four valves(GFV) in chemical industry, this article makes the simulation pictures of industrial DCS and field, develops its simulation algorithm of opening and flow rate, describes its simulation database and the course of data transmitting, fulfils its simulation operation based on the databaseorientated architecture and the development mode supported by simulation environment. This kind of development method is not only clear and easy to study, but also has high reusability rate and can promote the continuous development of the simulation environment,　plays an important part in the development of simulation training system of other chemical industrial process.

Modeling and Analysis of Queueing System with Colored Petri Nets

LIU Jian-ying;LI Xiao-long

2010, 1(6): 101-0103. doi:10.3969/j.issn.1006-2475.2010.06.029

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Colored Petri Nets(CPN) is the powerful tool for modeling the disperse event dynamic system. Queueing model can not analyze the dynamic behaviors of the queueing system and Colored Petri Nets can overcome these defects by introducting into the modeling of queueing system. The toplevel model is built up and the four elements of queuing system are given specific description of 〖JP3〗a CPN. This paper gives a concrete example to illustrate the use of CPN analysis in the queueing system. CPNTools is used to emulate the mode1.The results are compared with the theoretical value of the mathematical model and are analyzed to verify the feasibility.

Construction of Ontology in Elaborate Course Resource Repository Based on Semantic Web

LI Man-ling;YANG Zhi-ru;LUO Hua-zhi

2010, 1(6): 104-0107. doi:10.3969/j.issn.1006-2475.2010.06.030

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One of the important targets of the foundation of resources on elaborate course is how to share the resources. But the technology of Web make the rate of using is very low now in existence. This paper tries to introduce the technology of the semantic Web to the foundation of resources on elaborate course. After analyzing the functions on the elaborate course resource repository, the paper constructs the ontology of the elaborate course resource repository and implements the ontology modeling by use of Protege3.4.1. Finally, the evaluation of ontology is given, and proves its validity.

IP Management System Based on Workflow

REN Yan-yun

2010, 1(6): 108-0111. doi:10.3969/j.issn.10062475.2010.06.031

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This paper describes the design and realization of IP management system based on workflow, Ajax and master page technology. The whole system makes of message management module，user login module，man management module，IP management module，IP-Mac binding/unbinding module and log record module. This system brings more convenience for the users and administrator because it is adopted automatic IP distributing address，automatic bandings IP with Mac and automatic recycling. These functions are finished including equipment adding，equipment logining account，message managing，place managing and distributing IP address such as DHCP model and static model. It is implemented equipment logining base on Telnet and SSH model. The characteristic of this system is no sense of refreshing whole page，function modularizatio design and the page unified dynamic loading, so it can bring the users the sense of C/S Structure.

Research and Development of Personalized E-learning System Based on Web 2.0 and Ontology Retrieval

YANG Lan-juan

2010, 1(6): 112-0115. doi:10.3969/j.issn.1006-2475.2010.06.032

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Aiming at the deficiencies of piling up instructional materials and personalized is simplified existing in the current E-learning system, this paper designs a novel system of personalized E-learning based on Web 2.0 and ontology retrieval, by the application of Ajax and RSS feed and ontology technologies making the system according to the learner’s knowledge structure, learning objectives, learning styles, preferences and other information providers to adapt to learner characteristics of teaching methods and learning resources, and creates a personalized Web learning environment. Experimental results show the system can improve the quality of international learning efficiently and meets the requirements of the students learning needs.

Research on Personalized Search Engine Based on User Feedback

JIANG Jie;LI Jian-min;ZENG Qing-wei

2010, 1(6): 116-0118. doi:10.3969/j.issn.1006-2475.2010.06.033

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The existing majority of search engines have the shortcomings of providing the same results to the different users’ retrieval requisition, failing to reflect the users’ true interest. Aiming at the existing problems in current search engine systems, this paper is expected to propose and develop a personalized search engine based on user feedback. It is expected to generate interest of certain users and realize the personalization of search engine by learning user’s satisfaction feedback.

Design and Implementation of Network Shopping Cart Based on Hashtable and Session Technology

XU Zhao-xing;ZHAO De-fu;LIU Wu

2010, 1(6): 119-0121. doi:10.3969/j.issn.1006-2475.2010.06.034

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In E-commerce website, the network shopcart module is one of the most important part. The paper proposes a strategy based on Hashtable(hash table) and Session technologies to realize shopcart, which can effectively improve the security of E-commerce website and stability of the system, and furthermore, it gives the core of the source code based ASP.NET in C# language.

Research and Implementation of Multiple Auto-started Services Management and Monitoring Scheme Based on Digital Campus

LI Xue-jian

2010, 1(6): 122-0125. doi:10.3969/j.issn.1006-2475.2010.06.035

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Digital campus building is a kind of sustainable development project, and uniform portal, data sharing and systems interconnection based on information have become the defacto standards. Multi-service applications associated with each another makes it more difficult for IT departments to manage the systems. This paper adopts an effective program based on multiple auto-started services and states monitoring to improve the level of management, and supports and promotes the ongoing construction of information building.

Inter Cell Handover Algorithms Based on Movement Speed of UE in TD-SCDMA System

ZHENG Hong-dong;ZHOU Ya-feng;MAO Min

2010, 1(6): 126-0129. doi:10.3969/j.issn.1006-2475.2010.06.036

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This paper firstly introduces the basic concept of handover in TD-SCDMA system. At the present time, under such circumstances the transportation is diversified and wireless environment is complex, it leads out the basic concept of hierarchical cell structure. On the basis of the HCS, the paper introduces a algorithm of the inter cell handover based on movement speed of UE in TD-SCDMA and the flow of it, in the end, it gives the mechanism to avoid pingpong handover after handover success and the mechanism to punish handover failure.

esign of Ticket Reservation System on Platform of Tourism E-business

XU Jian-qiang;ZENG Qing-wei

2010, 1(6): 130-0132. doi:10.3969/j.issn.1006-2475.2010.06.037

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In order to easily view, browse tourist information and be convenient to people’s live, after the detailed requirements analysis and system analysis, this paper designs and implements a ticketing reservation system based on B / S mode of travel E-commerce platform, and describes the systematic analysis and design, and main functions of the system.

Design and Implementation of High Precision Flow Replay System Based on OCTEON

CHEN Jiang;LU Jian-de

2010, 1(6): 133-0136. doi:10.3969/j.issn.1006-2475.2010.06.038

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This paper introduces the multi-core network processor OCTEON and the basic development needs based on OCTEON, discusses the design and implementation processes for developing the high precision flow replay system based on this chip under Linux platform, including the communication between the host and OCTEON via PCI, and the timestamp implementation of high precision flow replay and the simultaneous replay of multiple flows. The performance test for this system shows that the flow replay based on OCTEON realizes highly parallel and highprecision processes. The implementation of this system has high application potential for network data flow detection, filter and IDS under high-speed Gbps environment.

Improvement of Weight of Web Page Features in Calculation Based on VSM

LI Zhong-yuan;YANG Shou-wen

2010, 1(6): 137-0139. doi:10.3969/j.issn.1006-2475.2010.06.039

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This paper uses the classical vector space model for text classification Web page. The weighting of traditional TFIDF formula exists some problems, such as the Web page keywords calculation, the differentiation between keywords is not high. This Web page structure is divided into two parts, one part containing the title, meta data, link anchor documents and Web pages keywords, another part containing the Web page body, and the weighting of the keywords is strengthened. Because the part of page body calculation adopts the improved IDF, so the keywords in the class differentiation effect are promoted to a certain extent. After the test, it proves that the method is feasible.

Integrated Circuit Chip Automatic Test System Based on SOPC Technology

LIU Ying-qun

2010, 1(6): 140-0143. doi:10.3969/j.issn.1006-2475.2010.06.040

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This paper introduces a integrated circuit chip automatic test systems based on SOPC technology, NIOS II softcore Cylone II EP2C35 device is used as the main component. Test results are displayed through the liquid crystal display. When this system applying to test in small and mediumscale integrated circuit chip of 74 series, it reaches very high precision, and can take advantage of FPGA hardware and software programmability, flexibly implementation of other devices test.

Fan Fault Diagnosis System Based on LabVIEW DSP Module

ZHANG Yu;LUO Chang-geng

2010, 1(6): 144-0146. doi:10.3969/j.issn.1006-2475.2010.06.041

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The article designs a kind of fan fault diagnosis system based on LabVIEW DSP module. Relying on the noise signal of the fan collected by TMS320C6713, the recognition system utilizes power spectrum gravity center, sound level, wavelet frequency segment power of the signal as feature vectors, and a BP network as classifier for fault diagnosis. The experimental results show that it is effective to extract fault information by the combination of lifting wavelet and neural network. The entire system has adaptability and feature extraction capability. The diagnose results are reliable and accurate.

Design of Three B-spline Curve Drawing System of Any Control Points

HUANG Sheng-zhong;LAN Yu-long

2010, 1(6): 147-0149. doi:10.3969/j.issn.1006-2475.2010.06.042

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The three B-spline curve in the actual project has been widely used. The three B-spline curve drawing system of any control points has not yet been found in the current literature. In order for B-spline curve to be more widely applied and for the “ComputerAided Geometric Design” course on the B-spline curve visual teaching to be userfriendly, this paper programms the three B-spline curve drawing system with Matlab GUI. The system interface is simple and easy to use. The screen coordinate system can be clicked with the mouse to input any control points. Any control points can also be entered by file way. Bspline curve equation may be described with matrix to achieve a quick count and draw a smooth curve of the three B-spline.

Application of Linux Signal in Process Control

QU Zhi-qiang;QIAO Jing;HU Shan-shan

2010, 1(6): 150-0152. doi:10.3969/j.issn.1006-2475.2010.06.043

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Signal is an effective way of communication between the processes in Linux system, through signal, information can be delivered between processes, and in the meanwhile signal can also control the operation of process to a certain extent. The paper introduces the system calls relating to applying signal, designs three models of controlling the operation of process by signal, and also analyses them with examples.

Research on Embedded Real-time Operating System Applications in Measurement and Control System

LI Zheng-min;JI Xiao-yang;CHEN Jing-yu

2010, 1(6): 153-0155. doi:10.3969/j.issn.1006-2475.2010.06.044

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Aiming at the problem of real-time in industry, based on real-time operating system uC/OS-II and ARM which is a microprocessor used widely, this paper designs a measurement and control system. The paper succeeds on porting the OS to ARM and researches the real-time OS in the system by writing multiple-programming. The result shows that the system can be used in industry in term of realtime.

Research and Design of Universal Data Migration Tool in Information System

XU Yan;LIANG Zheng-he

2010, 1(6): 156-0158. doi:10.3969/j.issn.1006-2475.2010.06.045

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Data migration is the question in information system which often meets in the promotion. This paper introduces to use Java and XML to achieve data migration between heterogeneous databases, to resolve the data heterogeneity of data conversion. Data migration has three parts which are the data extraction, data transformation and data loading. It also introduces the XML technology to achieve a common data migration tool, which makes it has good versatility and extensibility.

Design and Implementation of Office Automation System in Workflow-driven Manner Based on jBPM

ZENG Shao-ning

2010, 1(6): 159-0165. doi:10.3969/j.issn.1006-2475.2010.06.046

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With a research on architecture and features of the open source workflow and BPM engine JBoss jBPM, this paper analyzes the shortages of current development of office automation (OA) system, proposes a workflow-driven development method of OA system, gives a design and implementation of a real OA system to validate this method, and finalizes a practicable method for OA system development at last.

Research on ACM Online Judge System Based on Linux

YANG Zhi-wei;ZENG Yan-shan

2010, 1(6): 166-0169. doi:10.3969/j.issn.1006-2475.2010.06.047

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ACM contest is regarded as the one with the largest scale and highest level for international collegiate programming contest in the computer world. To meet the requirement of this contest, ACM online judeg system provides a training platform. So far most servers adopt Linux as their operation system due to its advantages like high security, stabilization etc. This paper proposes a ACM online judeg system based on linux and specifies its concrete realization of functions, like compling, testing, acquiring the information of computer consumption and returning the testing results. What’s more, the system can identify the hazards and threats leading to malicious resources occupation and malicious system call, then puts forward corresponding solutions. The advantages of this system include practicability, high security and so on.

Research and Implementation of Nagios Server Monitor System Based on Linux

WEI Gen-ya

2010, 1(6): 170-0172. doi:10.3969/j.issn.1006-2475.2010.06.048

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Nagios system is an open source software that runs on Linux or Unix server for monitoring. It has strong function and can monitor server on network entirely. This paper studies that how to make use of Nagios plugins available to achieve monitoring and detection for remote servers.

Actualization of Road & Bridge Charge-managing System Based on Heterogeneous System Frames

SUN Yong-lin

2010, 1(6): 173-0175. doi:10.3969/j.issn.1006-2475.2010.06.049

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In order to implement the supervision of motor vehicles and charge through toll collection system, in this paper, the heterogeneous software architecture are adopted, this heterogeneous software architecture, plots out layers for the big software system according to its scalability. After ploting out layers, the most basic public operation, combined two kind of heterogeneous software architecture: hierarchical and orthogonal are accomplished.The whole system structure is clear, expansible, easy to maintain, and can significantly improve the efficiency of programming.

Study and Development of Assessing System to Scientific and Technological Personnel’s Achievement

SUO Zai-ping;DU Hai-jian;WU Rui-chang;LI Nan;GUO Li-jun;WANG Yun-dou

2010, 1(6): 176-0179. doi:10.3969/j.issn.1006-2475.2010.06.050

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To provide an accessorial decision support system, scientific and technological personnel model is established using AHP method and expert investigation. The system is developed by the model and Delphi 7 based on Windows XP. The system makes managing more canonically, counting more scientifically and looking up quickly, which basically accords with the demand of manager and improves the efficency of assessing.

Design and Implementation of Intelligent GPS Terminal

CHEN Dong-wei;HUANG Dong-rui;LIN Wei;CHEN Shao-wen

2010, 1(6): 180-0182. doi:10.3969/j.issn.1006-2475.2010.06.051

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This paper uses the architecture of Intel XScale ARM CPU, the UP-TECHPXA270-S hardware as development platform, Windows CE 5.0 embedded operating system and the application program interface framework of qt-embedded-wince-opensource 4.5, designs and implements the intelligent GPS terminal. Firstly, an embedded operating system on the hardware platform is ported, including a variety of lowlevel drivers of the integrated hardware devices and peripheral devices; Secondly, the QT 4 .5 is used to designing applications and friendly GUI interface on the system; Finally, the mif and mid format files which is exported from MapInfo is read, and a navigation map based on the QT view framework is drawn, as well as wireless communication systems, fingerprint recognition, united alarm system and other functions are implemeted.

Research on Processing LOB Data Based on SSi2 Frameworks

SUN Li;LI Xin

2010, 1(6): 183-0186. doi:10.3969/j.issn.1006-2475.2010.06.052

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In the Web development of small and medium-scale enterprises, upload or download of many types of LOB data are often needed. Moreover, with the increase in business, it’s very important to establish a reusable system and easier to maintain it. Presentation layer uses Struts2， business logic layer uses Spring and endurance layer uses iBatis（SSi2）, they are free lightweight frameworks and often used in Web development. After analysis of the three frameworks, the three frameworks are integrated to process LOB datas in the Web system, several key points, the advantages of hierarchical design, low coupling between the codes are elaborated through the integrate. After integrating, the maintainability and expansibility of the system are greatly strengthened.

Realization and Evaluation of Paodingjieniu Chinese Segmentation in Nutch

SUN Dian-zhe;WEI Hai-ping;CHEN Yan

2010, 1(6): 187-0190. doi:10.3969/j.issn.1006-2475.2010.06.053

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Chinese word segmentation is one of main challenges for search engine. By analyzing the scoring mechanism of the document of Nutch, for the situation that word segmentation of Chinese word segmentation module of Nutch does not conform to Chinese language habit, this paper proposes to use Paodingjieniu Chinese word segmentation module based on dictionary to segment the data collected by Nutch, describes the method that how to realize Paodingjieniu Chinese word segmentation module on Nutch, then tests the word segmentation module. Experiments show that the word segmentation result of Paodingjieniue word segmentation module more conforms to Chinese language habit, and the coverage of terms are more balanced for documents, in addition, 20%~65% of the storage space of index file is saved.

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