2012, 21(10):1-4,13.
Abstract:Business intelligence systems integrated with ERP applications have met the requirements of businesses for the support of decision-making by intelligent data mining and data analysis, but they still cannot provide real-time analytical data on an on-demand basis to help businesses quickly respond to market changes. First, an architecture of a real-time mobile business intelligence system integrated with ERP applications is proposed, then middleware technology and service oriented architecture are used to design a scalable, low coupling, and cross-platform framework of a mobile business intelligence system. Finally, an example is presented to describe in detail the implementation of the system in the mobile terminals by Android.
2012, 21(10):5-8.
Abstract:The sharing of information exchange system in the city emergency response command platform is the most basic and most important part. Combination of the actual work of Emergency System construction in Tianjin, this paper between the city and district levels of government emergency response platform and the various departments of professional emergency response system, to establish a standard, reliable data exchange and sharing system, for each dispersion applications to provide information exchange platform for the public to enjoy the sharing and exchange of emergency information resources, to provide information support for the city dispose of emergency incident linkage command.
LI Hui , ZHAO Yun-Min , TONG Wei
2012, 21(10):9-13.
Abstract:After years development, oil extraction engineering industry’s data increased gradually. And it lacks a unified, interactive, visual information query and display platform. In this paper, firstly the system architecture of oil extraction engineering tools and project simulation system is built. It analyses the basic functions required by the system -the model display, formation of simulation, and production data query. And it describes the key technology to achieve system transformation, including equipment model, formation of the simulation, the realization of human-computer interaction, etc. The system can provide users with complete information from a database query, show each part of component information wellbore, completion status and production measures intuitively. For engineering designers, it helps them to design, report, and analysis.
2012, 21(10):14-17.
Abstract:The rise of cloud computing brings new opportunities and challenges for education industry, this paper illustrates the application of Donghua cloud developed by VMWare and Citrix technologies in the management of university computer laboratory. In this way, it does not only have achieved server virtualization management and unify the management of teaching resources, but also can improve service availability and resources utilization. Meanwhile, it also can ensure the service reliability and save the management cost.
2012, 21(10):18-21,17.
Abstract:According to present status of information construction in paper-making enterprise, information integration technologies are performed to build multifunctional integration system in order to effectively solve a series of problems which paper industry faces. The suitable functional framework architecture for paper-making enterprise is researched as well as key integrated technologies such as information modeling, system interface design and OPC-based data collection are described on the basis of deep investigation. Finally, a paper-making enterprise in Fuyang, Zhejiang Province is as an example, which the interactive control network topology structure and some key system implementations are introduced. At present, the system has been successfully put in application.
2012, 21(10):22-26.
Abstract:With the rapid development of Internet and wide spread, so that all devices connected to network, the Internet as a medium to achieve information exchange to become the future network development trend of the equipment. This article describes a microprocessor S3C44B0X in ARM7 architecture and RTL8019AS network interface chip for the main components of embedded systems, and migration uClinux operating system, the boa software and CGIC library. Serial devices network, the user via the Internet to interact with Web pages and remote real-time monitoring and management equipment. The system has broad application prospects in the field of industrial automation, remote monitoring.
LI Peng , LI Xiao-Feng , TAN Hai-Bo
2012, 21(10):27-30.
Abstract:Common service software implementing DHCP protocol lacks the network-access authentication, which makes DHCP network insecure, and to overcome this shortcoming and ensure the success of terminal and security of access, it has to deploy additional commercial software. However, these software need some plug-ins’ support, and any one of these plug-ins is not qualified because of heterogeneity of network and terminal. To meet demands of diverse-terminal heterogeneous-network secure access, a self-management access system was designed which provides authentication function based on dynamic MAC address binding. Besides, this system provides a self-management module which has a vital function for registering and managing MAC address and querying network-access records, and a DHCP-configure file module which aims to dynamically generate and conveniently manage DHCP-Server configuration file. It is flexible and ease-configure without any plug-in.
LI Wen-Jiang , ZHENG Xiao-Lin , SUN Hong
2012, 21(10):31-35.
Abstract:Saddle shaped curve in the industrial production is widely used in the welding, and the traditional interpolation algorithms cannot be applied to the automatic welding. In this paper, based on the Mitsubishi PLC controller Q02HCPU and the interpolation algorithm principle of design research, the saddle-shaped geometry characteristic foundation, proposed based on point by point comparison and angle approximation of direct interpolation algorithm, and through MATLAB software simulation. The experimental results show that the algorithm has high precision in interpolation, and make software programming easily to realize, to improve the saddle shaped welding production automation.
2012, 21(10):36-39,65.
Abstract:The campus virtual roaming system is the important content of the university information system development strategy, the virtual roaming system is applied in every field of our lives. Take a college as virtual space, the system based on Unity3D platform is constructed by using 3Dmax to build the scene, taking JavaScript and C# as the programming tool to implement the function of interaction. Through the integration with html, the virtual campus is established. This system has three-dimensional navigation function and good interactive experience. It is convenient for consumers to require information about the college. Through this experiment, it is proved unity3d is a very useful tool for designing a virtual platform.
2012, 21(10):40-42,75.
Abstract:The schedule between servers and users is a MOP (Multi-objective Optimization Problems), in a distributed and shared educational resources system. Ant colony algorithm has been proved to be a kind of effective algorithm to solve it. A common model of the above schedule was given, and ant colony algorithm was applied to optimize the schedule. The experiment results show that the effect of this optimization is evident.
NIU Ying-Li , LI Xiao-Feng , QIAO He , GE Ai-Li
2012, 21(10):43-46.
Abstract:The positioning method such as radio frequency identification used in the mine transportation system can only detect the specific position of the locomotive, but cannot realize the precise positioning. By studying moving target location technology, data communication technology and visualization technology, combined with the special working conditions of the coal mine, a new mine positioning system used inertial navigation technology was proposed. The information of the locomotive, including location, speed and direction, was measured by accelerometers and gyroscopes. Through the wireless communication and wired communication, the data was transferred to the computer control center, using the Kingview software to show the precise location of the locomotive. This system makes it convenient for control room persons to get real-time information of the electric locomotive, and improves safety and efficiency by removing incidents.
2012, 21(10):47-52.
Abstract:We have developed a virtual instrument software system of cross platform based on graphics processing unit (GPU) and OpenGL® ES. This software system can do real-time rendering graphics context according to the external event trigger. It includes event driver, graphics display, embedded system entry and embedded system hardware modules which have the flexibility and extendibility. We take some key technologies to optimize the flow of embedded graphics application.
2012, 21(10):53-56,80.
Abstract:Evidence Theory used in calculating the uncertain metrics of the uncertain events is developed based on probability theory. And the organization goals describe the future states of an enterprise during some time so that the possibility of one goal satisfied is evaluated with some uncertainty which is accorded with the uncertain evaluating method in evidence theory. In this article, evidence theory is employed to formulate the organization goals and to define a reasoning method with goals. With goal model built reasoning is done according to the automatic reasoning algorithm in which only uncertain metric of some goals is needed.
HONG Cheng-Yu , XU Zi-Long , KANG Yong-Gan , YANG Shang-Qin
2012, 21(10):57-60,85.
Abstract:With the development of the integration of seismic exploration software in the acquisition, processing, explaining, builds cloud computing platform of a cross-hardware, operating system that becomes necessary; and in cloud computing platforms, the common thread library becomes the key to the development of a large amount of computation algorithm of seismic software. In the paper, the analysis of the threading model and synchronization mechanisms, sorting out the property of the thread, thread control, thread flow and synchronization properties and operation; finally, on the basis of these common components, to package a variety of local thread library, so that implement cross-platform common thread library on basis of any native threads library.
2012, 21(10):61-65.
Abstract:By using the widely applied bash/shell scripting languages and making flexible use of awk and other embedded function commands, we managed to construct the deployment and management framework based on the BASH scripts for multi-component in the Unix environment, which claims certain file directory organization. The framework support the day-to-day operations such as installation, operation, logs, monitoring, backup, automatic upgrades, cleaning, helping in its good operability, scalability and compatibility, which provides a good basis for the applications in Unix Environment.
CHEN Zhi-Yang , DING Hao , ZHANG Yin
2012, 21(10):66-70,104.
Abstract:The paper presents an algorithm of the Finite Element mesh generation based on STL Data. The algorithm is mainly used for CAE engineering analysis. Considering the bad shape of STL model from CAD system, we need re-meshing the STL model so that the shape of triangular is better use for CAE analysis. The algorithm includes 4 steps: topologic creation, mesh clustering, mesh re-sampling, triangulation. The results show that our algorithm can reduce the ratio of the longest edge and the shortest edge of triangle mesh effectively to make shape of triangular is in uniform.
YU Bo , YU Dong , JIA Jun-Ying
2012, 21(10):71-75.
Abstract:IMS-based streaming media service always provides live or on-demand content services for customers. However, the centralized service model does not utilize resources fully but leads to concentrated data flow, which will refuse to provide services for more terminals or even affect the service availability for the failure of the media server. In this paper, an IMS-based overlay network content distribution mechanism to support multipath transmission is proposed. Through the introduction of the overlay network on IMS resource sharing and distribution can be achieved. It also improves the network resource utilization, reduces the load of the central media server. The experiments show that IMS-based overlay network content distribution mechanism has a significant advantage compared with the traditional media server content distribution mechanism.
2012, 21(10):76-80.
Abstract:Efficient optimal path is the key issue of the Ant Colony Algorithm used in road traffic navigation system. Aiming at the problem of slow convergence and stagnation phenomenon of Ant Colony Algorithm, this paper introduce path selection strategy which is based on the heuristic factor of A* algorithm to speed up the convergence. Meanwhile the Double-population strategy of the Genetic algorithm and the pheromone update rules of the Ant Colony System (ACS) are introduced in the algorithm, which avoid stagnation of the algorithm of the algorithm and speed up convergence. The results of the simulation experiment show that the improved algorithm has good stability, global optimization and fast convergence.
2012, 21(10):81-85.
Abstract:Aiming at the problem of text classification, one text classification method based on the probabilistic neural network ( PNN ) and learning vector quantization ( LVQ ) is proposed. The text features and feature values are extracted by use of TFIDF method, and text categorization feature vector are formed. In addition, classification model based on probabilistic neural network can be constructed and the learning of competitive layer network is completed by using LVQ algorithms, so the corresponding pattern vector to move closer to each other, away from the other modes, thereby realizing text classification. The experimental results show that the method in the text classification performance with very good results, and not only has good classification accuracy, but also shows a good learning efficiency.
JIANG Yi-Heng , SUN Yong , WEN Xiang-Ming
2012, 21(10):86-90,113.
Abstract:It is mainly Open IMS Core in the software implementation of platform for the IMS core network currently. Though most of the existing IMS clients have their own specialty, they poorly communicate between each other. The client-side components of Doubango are based on the unified framework of Doubango, wireless clients and fixed clients of which possess the same algorithm of exchange information and have good interoperability. This paper describes current main IMS clients of open source and carries out interoperability tests, then analyses the software architecture of Doubango’s client-side components, finally add a new function to one of components. The client architectures presented in this paper can be important foundation of extending the IMS clients, making which take high-performance applications on, and can be applied in different operation system to expand the serviceable range of IMS clients.
ZHOU Rong-Hua , ZHAN Yin-Wei , MEI Zhen-Shun , ZOU Li-Hua
2012, 21(10):91-94,129.
Abstract:A quick video browsing algorithm is proposed for videos of sparse objects. Background subtraction is applied to get foreground object and the background is updated constantly. Those frames without objects are first discarded and the remaining frames are further fused. Experiment shows our proposed algorithm is robust and has good performance.
SHI Fei-Fei , HAN Wei-Guang , LI Chang
2012, 21(10):95-99,117.
Abstract:Clustering technology has been widely used in wireless sensor networks. This paper introduces a clustering routing algorithm based on energy feedback (EFCA). The algorithm constructs a data aggregation tree in cluster units to reduce energy consumption of the outer edge node in multi-hop transmission and reduce the delay in single-hop transmission; selects a cluster head-couple in the cluster, the primary and secondary nodes are responsible for transmission of information between the clusters and the information gatheringin the cluster, further reducing the data transmission delay; the energy feedback mechanism proposed eliminate the network “hot zone”. Simulation can effectively extend the network lifetime.
CHEN Si-Ling , ZHENG Qi-Long , FENG Yu-Qian , FU He-Ping
2012, 21(10):100-104.
Abstract:VLIW DSP obtain time parallelism through software pipelining, and obtain space parallelism through instruction clustering. The essence of clustering is resource allocation. Traditional clustering assumes that one instruction assigns to certain cluster, but that does not applicable to some architecture offering SIMD instructions. This article proposes an algorithm based on evaluation model can do well with the problem of clustering for ordinary instructions and SIMD instructions. By scheduling inter-cluster transfer instruction, we synthesize inter-cluster double word transfer instruction. With the help of SIMD instruction, inter-cluster double word transfer instruction and good clustering policy decision, we make the schedule latency shorter. For many DSP programs, comparing with no clustering, we obtain 2 ~ 3 times increase in performance, comparing with clustering algorithm based on register allocation, we obtain 7~10% increase in performance.
ZHANG Jia-Shan , WANG Zhi-Hong , CHEN Ying-Xian
2012, 21(10):105-108,134.
Abstract:The basic ant colony algorithm converges slowly, is prone to plunge into partial optimum and results in search stagnation. In this paper, the optimized compositor is introduced into elitist strategy. According to ant compositor, new weighted coefficient is designed for pheromone updating. The simulation results of 30-city logistic distribution show that improved algorithm is more efficient and accurate than the basic ant colony algorithm.
2012, 21(10):109-113.
Abstract:It is important in theory and practice to translate a NFA into DFA. So far, subset construction is the most popular method. The method, however, needs import a dummy input ε and ε-closure and has a complicated computing procedure. In this paper, a new method to translate a NFA into DFA straightly is described. The new method needn’t import a dummy input ε and ε-closure, it accords to the original NFA state graph or state shift table to translate a NFA into DFA straightly.
2012, 21(10):114-117.
Abstract:In the region of high maneuvering target tracking, the traditional interacting multiple model(IMM) algorithm has a fixed structure, which needs lots of models to describe the target maneuver, brings calculation burden and unnecessary inter-competition among the models maybe reduce the performance. To resolve this problem, an adaptive variable structure multiple model (AVSMM) algorithm is presented. Using several models which related to the target motion, according to the current target maneuvering level, at different moments, the algorithm can adjust the model’s parameters and build a different model set, then begin to filter estimate. Simulation results show that this algorithm can match actual target trajectory with less computational complexity and better accuracy.
2012, 21(10):118-121,183.
Abstract:This paper analysed and contrasted multi-algorithms about DHMM (Discrete Hidden Markov Models), based on which it designed an improved DHMM algorithm, and then, applied it to the embedded speech recognition system. This system was realization of speaker-independent’s isolated word recognition. The flatform of this system was centered ADSP-BF531. And it was expanded by big capacity SDRAM & ROM. This system has many merits, e.g. small volume, high speedand, high reliability, high robustness and high expansibility, etc. It is very convenient for some special situations and has much market potential. The experiment confirms that its speech recognition accuracy reaches 94 percent for speaker-independent and small vocabulary. This paper introduced the improved HMM algorithm, hardware design and its application effect.
2012, 21(10):122-125.
Abstract:The mining and analysis of community in complex networks is an important issue in many domains and disciplines. In this paper, focus on the sparsy Communication Matrix of the massive data, we suggest a fast mining algorithms based on a heuristic function to merge called KFN algorithm, and also show out the MapReduce model of this algorithm. With experiment focued on the DBLP paper co-network data sets, we conclude that distributed mining model and the merging strategy based on the heuristic function can improve the time efficiency on community mining.
2012, 21(10):126-129.
Abstract:Fuzzy C-Means clustering algorithm is a classical clustering algorithm, which is widely used in data analysis and performs well. However, serious defects in the algorithm limit the application of the algorithm and development. Pharmaceutical process is a very complex integrated system, whose parameters are very complicated accused of the relevance and existence of fault and error. For these issues, the Fuzzy C-Means algorithm is applied to dynamic recurrent fuzzy neural network predictive control. Improve Fuzzy C-Means algorithm with IPSO algorithm to do the clustering of data and failure pattern recognition of system to achieve the early warning and ensure system stability.
LI Wen-Jun , ZHOU Shi-Xun , ZHANG Xiang-Li , FAN Lu , XIONG Jin-Feng
2012, 21(10):130-134.
Abstract:In order to solve the problems of low accuracy, long time for error testing and low automation when peple use traditional instruments to test the error of degaussing equipment. In this paper, the degaussing system error sources and characteristics of degaussing equipment are discussed. It analyzes the feasibility of a common error handling method such as the least squares method and practical filter analysis. Meanwhile it also researches the test methords about degaussing equipment static characteristics, dynamic characteristics, transient characteristics and normality characteristics. This paper studies the algorithms of the system self-correction technology, gives the three stages of data calibration method to eliminate the systematic errors, devises the differential amplifier circuit to suppress the zero-drift phenomenon, Based on virtual instrument technology and Labview platform, according to the proposed test methods and analytical methods, it gives a successful implementation of a degaussing power error testing system.
ZHANG Min-Hai , WU Xin-Kai , ZHANG Ting-Ting
2012, 21(10):135-138.
Abstract:Design of image acquisition platform based on TMS320VC6713 DSP &FPGA is presented and the realization of JPEG compressing encoding based on DSP are expounded, and sends the processed image data to PC by USB bus. The experimental result indicates that this design reduces effectively the space of the picture. High compression ratio is obtained from experiments.
PENG Jiang-Ping , JIANG Yan-Yan
2012, 21(10):139-142.
Abstract:For the challenges of complex network structure and application architecture in the regional health environment, Web services-based health insurance interface system, adapt to the current interface between HIS and medical insurance, is designed and implemented with JNative, JACOB and other Java components.
WEN Cheng-Wei , CHEN Wen-Jiang , ZHAN Yong
2012, 21(10):143-147.
Abstract:The paper designs and researches a binocular stereo measuring system based on S3C2440 hardware platform and embedded Linux. The system captures images data in synchronization by using 2 USB cameras, and then processes the images data in OpenCV Lib. Finally, calculate the pixel deviation of the target in two images, and then calculate the distance from the target to camera plane, license plate be seen as the target in the paper. At the same time, the system displays the images and dates on LED with Qt/Embedded GUI in real time. The whole system is built on an embedded architecture, able to capture images and process data and real-time display data independently. When change location algorithm, we can calculate the distance of any targets.
JIAN Xian-Zhong , YAN Jun , FAN Jian-Peng , HOU Yi-Xin
2012, 21(10):148-151.
Abstract:The algorithm of audio compressor is analysed. Especially describle how to process two parameters: attack time and release time. The algorithm is checked by MATLAB. DSP chip TMS320VC5501 and Microcontroller Unit STC89LE58RD are used as cores to set up the platform. Hardware design and software design are given. The compressor is tested by the same audio source which is used in the MATLAB. Compare the result of MATLAB with of compressor and mean error between them is only 0.38%. So the correctness of this design is proved and meets the need of high accuracy of audio comprssor. This design can be seen as a new way to high-accuracy audio compressor.
ZUO Guo-Cai , ZHOU Rong-Hua , FU Kai-Yao
2012, 21(10):152-154,203.
Abstract:Due to an increasingly competitive telecommunications market, in order to keep customers, to prevent the loss of customers, enhance the competitiveness of enterprises, this paper uses DBSCAN algorithm to the loss of customers data types, analysis of customer loss, combined with the decision tree ID3algorithm in customer churn prediction, experimental results show that, two kinds of algorithm combined, makes the customer churn prediction accuracy obtained improved.
CHEN Zhen , WANG Yan-Jiang , WANG Zhao
2012, 21(10):155-158.
Abstract:In this paper, using the LabVIEW—graphic programmed language, a Drilling Well-control Simulation System is proposed.In this simulation system,by interactive database and TCP/IP, Drilling Well-control Equipments are realized. The simulation results demonstrate that this design method is user-friendly and has the characteristics of good simulation fidelity, short development period and expandability.
LV Hai-Long , ZHOU Yuan-Ping , YU Chang-Jiang
2012, 21(10):159-161,187.
Abstract:The paper introduces a design of embedded ARM11 to realize order way, improve the efficiency of the restaurant. In the hardware S3C6410 ARM11 processor by Samsung, with 7 LCD touch screen, to facilitate customer order, in which wireless communications transmission (802.11), will be able to realize the multiple client and server two-way communication between. In software, using Linux system as the operating system, the design of the interface to order are mainly used GTK+ function library for implementation, system combining order, entertainment etc, the test shows that the system has high efficiency, the value of the cost savings.
2012, 21(10):162-165,158.
Abstract:A fast character display technology based on the sparse storage is presented. The optimization band storage with sparse structure has the best performance comparing to the previous character storage. And we adopt the predefined glyphs information to index the required character and its appearance data (color etc). Some experiments about computing cost have been finished.
2012, 21(10):166-170.
Abstract:In order to obtain high-precision fiber identification and counting of fibers by color image analysis and clustering features of the experiment, obtained in the YUV space using only U, V components of the image color clustering. Using k-means clustering algorithm for color image clustering, each pixer according to the image clustering properties of the image segmentation.Identification of the fiber count links, using the segmented Hough transform the way out of the fiber image recognition and counting. Experiments show that the algorithm to identify high precision, can adapt to a range of optical changes in the environment, better robustness.
2012, 21(10):171-173,170.
Abstract:The LOD model based on quad-trees is improved on the basis of former researches. This model is applied to manage and organize terrain data. Node judgment rule is established to determine the detail degree of the present visual area. A new bidirectional way was given to recover the cracks according to distance. By programming, this method is proved to be able to generate multi-resolution terrain model continuously, improve the efficiency of terrain navigation, and realize smooth transition of the models with different resolution.
LIU Zi-Feng , FAN Bing-Bing , ZHENG Wei-Ping
2012, 21(10):174-178.
Abstract:Website cloud is a multi-tenant cloud deployment architecture. This thesis studies the resources scheduling policy of the Eucalyptus-based website cloud, and the HTTP request as fine-grained task for the greedy scheduling algorithm. It also discusses the model of weighted machine learning algorithms, that the system can take the initiative to perceive the request peak and load balancing. Experiments show that the ideal.
LIU Gao-Ping , CHEN Hong-Liang
2012, 21(10):179-183.
Abstract:This paper introduces one design method of ECG service system based on the electrocardiogram sampling module and intelligent mobile phone. This paper gives the basic structure of the system at first, then the focus is given to the design scheme of a Bluetooth interface ECG machine and the software design method of mobile phone terminal, in which the ECG machine is designed using special ECG module AIKD812-256 and Bluetooth module HC-06, the function of Bluetooth communication, data storage, electrocardiogram data sent to the server is realized on J2ME programming platform, and the key code in the realization is analyzed. The test result of the ECG machine is given at last. Test results show that the design of the ECG machine can be used for remote medical treatment and care.
2012, 21(10):184-187.
Abstract:Different expersimental models generate heterogeneous datas in experimental research. It is lead to datebase cumbersome, inconvenient to date analysis and system expanding. Through specific example,this paper analyzes on the existing problems. According to the thought of OOP is constructed, use technologies about date heterogeneous, data transfer and data cleansing, realise the date storage of different experimental model by integrated database is discussed in detail.
2012, 21(10):188-193.
Abstract:The paper analyses the way of hiding processes and common method of detecting hidden Processes and discusses the principle and the way of searching system memory to detect hidden Processes. First judged whether the page is effective or not, Then judged whether memory address is address of eprocess or not according to eprocess’s character and object’s character. And bring up the way of judging pae memory mode or general memory mode, The way of judging whether the page is effective or not in two memory mode. Discusses the way of improving efficiency. Experiments on windows 7. vista operation system showed that the algorithm can enumerate all processes with high efficiency in two memory mode, These processes hided self by hooking functions, or directly entered into kernel space changed kernel data to hide self.
FENG Kai-Ping , CHEN Heng , FENG Chao-Ying
2012, 21(10):194-197.
Abstract:Histogram is a kind of important tool in data query. Cost estimation needed in query operation of database varies in methods, in which histogram is that is most convenient for use and maintenance. Histogram categorizes and sets barrels to all tuples in the relations, calculates the size respectively for each barrel, and then summarizes, thus making the price statistics closer to the real value. In application of the actual program, this research works out methods that convert the connection of the relations to a variety of histograms and ways to estimate the operation cost by using histograms.
2012, 21(10):198-200.
Abstract:An authentication scheme which combined the fingerprint recognition,smart card, PKI technologies together has been proposed.In this paper, we propose the specific identification procedure of the implementation of this authentication system which offers user verification and system identification function, the security and the feasibility of this authentication schemes is discussed at length.
2012, 21(10):201-203.
Abstract:Regular expression is a powerful tool to express a complex retrieve condition. However, some lacks that still exist in the current regular expression. For example, we can’t express such a meaning like “any one kind of fruit”in a simple form. In this paper, an extension based on set which can be defined dynamic by user is proposed. By this extension, this paper can express the meaning “here can be any member of the set” simply in a regular expression.
AN Xiao-Bo , CHEN Shu-Yu , LIU Xiao-Wei
2012, 21(10):204-207.
Abstract:In order to improve the speed of vector map rendering in embedded GIS, a organization model of map data based on LOD was built which fitted the embedded environment well. This model was designed according as the embedded hardware restriction. Based on two aspects of reducing the amount of redundant geo-entities out of display area and speeding up the search efficiency of vector data from external memory, several process were done on the data of vector map, including delaminating, blocking and index building. The experiment results of this method indicated that these strategies could improve the displaying speed of vector map in embedded environment well.
2012, 21(10):208-213.
Abstract:The processor dynamic voltage and frequency scaling(DVFS)leads to unequal performance loss for concurrently running tasks in Linux, affecting the fairness of CPU sharing. This paper proposes a dynamic time-slice scaling scheme to improve the fairness of CPU sharing for concurrently running tasks. The method which is implemented based on Linux task scheduler dynamically scales the length of time-slice for each task using a time-slice scaling factor which is calculated based on the processor performance monitoring unit statistics. Experiment results show that dynamic time-slice scaling scheme can significantly improve the fairness of the CPU sharing with low overhead compared with the conventional Linux scheduler algorithm.
2012, 21(10):214-216,219.
Abstract:Based on analyzing the structure of linux system, the paper describes the key steps of transplanting a complete linux system to S3C2440 platform and also detailed introduces how to establish your own cross-compiling environment and the method of making a pure yaffs2 file system. Through compiling and delivering bootloader, kernel and root file system, the experimental results show that it implements the transplantation of linux system to S3C2440 platform successfully.
2012, 21(10):217-219.
Abstract:Aiming at the central air conditioning chilled water system is a nonlinear, large delay and time variability system, expert PID controller which is based on expert experience is designed. The MATLAB simulation shows that expert PID controller has higher dynamic characteristics than the conventional PID controller. It can achieve the ideal control effort.
WEI Yuan-Yuan , QIAN Ping , WANG Ru-Jing , WANG Xue
2012, 21(10):220-223.
Abstract:With the development of the Semantic Web, the interoperability and sharing of expert system were put forward more advanced requests. The researches for new knowledge representation and knowledge base systems are important trend. As a formal, explicit specification of a shared conceptualization, ontologies provide frames for interoperability between different systems and can solve the sharing and interoperability problem effectively. There were a variety of doubts in some beginners’ mind with the concepts of knowledge base, ontology and expert system. Based on the author's understanding and practice, the systematic comparative analysis between knowledge base, ontology and expert system in the domain of knowledge engineering were proposed in this paper, in order to make these terms less confused and more clearly comprehensible.
2012, 21(10):224-229.
Abstract:The main contributions of this paper are: 1) The main feature extraction approaches are classified into four categories; 2) The main idea of each category is analyzed, the advantages and disadvantages are pointed out; 3) The guidelines of choosing suitable feature extraction approach is suggested.