Table of Content

14 February 2014, Volume 0 Issue 2

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An Approach of Commercials Detection Based on Audio-match

ZHAO Hua-ting1, WANG Ming-min1,2

2014, 0(2):  1-5.  doi:10.3969/j.issn.1006-2475.2014.02.001

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Commercials detection is to extract advertising sequence out of TV shows automatically. In traditional ways, it adopted algorithm based on computer vision technology framework to detect advertisement in terms of video content. But it wouldn’t meet the demands on performance or efficiency for commercial usage. The algorithm described here used only audio information for detection. It first extracted original audio information from video, then used short-time Fourier transform to transform it into a spectrogram. And it applied binary threshold with a set of pre-boosting filters to get local feature descriptors. During the detect phase, it obtained descriptors in the same methods described above, and detected results in offline descriptor library. Audio-based detection algorithm for commercials detection had smaller storage, higher accuracy, and better real-time. Experiments showed that this algorithm could significantly improve robustness and performance of commercials detection systems, and can be applied in reality.

An Automatic Review System for Formal Deduction in Propositional Logic

WEI Wei, XIE Hui-zhen, ZHANG Li-chun

2014, 0(2):  6-9+14.  doi:10.3969/j.issn.1006-2475.2014.02.002

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Automatic marking scores is the inevitable choice of large-scale computer test, but the computing symbols, operation step, and solving method of mathematics subjective problem are diversity, which always restrict the development of examination system. Mathematical logic is a branch of mathematics, and propositional logic is a part of mathematical logic. The same scheme of formal deducibility in propositional logic can have different formal proof, which means one problem has different solving methods. But it has a strict procedure, so we can make use of this characteristic to develop an automatic scoring system for itself by using C#. Application shows that, the system has friendly interface and it can greatly improve the efficiency of the teacher.

 

Discovery of Association Patterns of Curriculum Examination Results Data from Education Informatization

YU Ru, HUANG Li-xia, HUANG Ming-xuan

2014, 0(2):  10-14.  doi:10.3969/j.issn.1006-2475.2014.02.003

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Facing the massive education information data, how to find and analyze those potential, valuable knowledge and educational patterns hidden in these data, better to provide scientific basis for education teaching decision-making, has become an urgent problem to be solved. This paper proposes a novel course grades data association patterns discovery and analysis method. Aiming at the characteristics of course grades data, the method gives a curriculum data model firstly, and then uses matrix-weighted patterns discovery technology to mining patterns in course grades database so as to find those data association rules hidden in the data. The teaching rules and problems in course teaching are acquired by analyzing these patterns, providing the scientific basis for teaching management, teaching reform and decision. Compared with the existing association pattern discovery methods, the method proposed in this paper is more effective and more reasonable.

DirectX-based Techniques of Stereo Loading System’s 3D Visualized Auxiliary Module

GUI Si-yi, LIN Guo-shun

2014, 0(2):  15-18+23.  doi:10.3969/j.issn.1006-2475.2014.02.004

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Stereo loading system (SLS) is an intelligent layout system designed for container loading. Its unique 3D visualized auxiliary system is based on the accomplishment of spatial layout optimization and utilizes the application programming interface DirectX, eventually allows users to see the cargo container loading result visually and furnish the system with full manual editing functions. This article elaborates the main technical points involved in the development of the 3D visualized auxiliary system of SLS. Successively, it introduces the program design ideas of Direct3D-based three-dimensional scenes’ real-time rendering, picking-up and movement methods of the model and the collision detection mechanism between models. Finally, it displays the manually edit module effect diagram of the SLS.

Model and Simulation for Driver Route Choice Based on Fitness Function

ZHANG Jin-jin1, SU Jing2, LIU Bao-xun1, ZHANG Jie2, LIU Xiao-ming1

2014, 0(2):  19-23.  doi:10.3969/j.issn.1006-2475.2014.02.005

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In order to resolve the route choice problem in traffic simulation, with the route choice history experience and route choice recent experience of driver, the initial fitness, history fitness, recent fitness and route choice action probability are defined, then the memory property of driver and changing process are described, at last, the route choice rule is brought up. On the basis of above analysis time step simulation are carried out repeatedly, the simulation result proves that the rule is simple and effective, but provides a new way for the driver route choice model in traffic simulation.

A SNS User Interest Model Based on Data Mining

XIE Zi-qi, XIE Ying-hua

2014, 0(2):  24-27+31.  doi:10.3969/j.issn.1006-2475.2014.02.006

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This paper mainly introduces the modeling process and the key technologies of SNS user interest model, including the vector space model, cluster analysis and so on. Besides, it creates a system to support the model, focusing on how to make a program to calculate the user’s interest. This model is easy to update and extract, so it can be developed into software embedded into social networking sites in order to know users’ interest.

Optimization of Resource Package Delivery Based on Evolutionary Algorithm

DENG Hai-xin, AI Li-rong

2014, 0(2):  28-31.  doi:10.3969/j.issn.1006-2475.2014.02.007

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Because natural disaster relief package delivery, efficient military strikes are related to the realities of resource package optimization delivery problem, which is NP-hard, it is very easy to fall into local optimization by using traditional search method, so designing efficient modern heuristic algorithm to solve this problem is particularly important. This paper presents a method to solve the problem through regional classification, heuristic method and linear programming. We respectively use the evolutionary algorithm and the genetic algorithm to determine the placement of resource packages. Experimental results show that the evolutionary algorithm can better process the resource packet delivery.

Performance Test of x86-based Server Virtualization Platform

ZHANG Yu-chen, ZHANG Xiao-fang

2014, 0(2):  32-35+40.  doi:10.3969/j.issn.1006-2475.2014.02.008

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A performance test system for x86-based server virtualization platform is proposed in this paper. This system supports Xen, VMware ESXi and Microsoft Hyper-V virtualization platforms, and it can make performance testing on virtual servers and fetch performance data of the virtualization platform under test at the same time. Performance tests are made for the 3 virtualization platforms above. The result shows Xen paravirtualization has performance advantages and ESXi performs best generally.

One Way of Test Case Generation Based on Cloud Platform

DU Jing-jing, ZHAO Peng-fei

2014, 0(2):  36-40.  doi:10.3969/j.issn.1006-2475.2014.02.009

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With the rapid development of cloud computing, cloud computing is widely used, software testing is one of them. Software testing process is always tedious, error-prone and time-consuming, especially in the preparation stage of test cases and test environments. This paper presents a program of test case generation and execution, which starting from UML model diagram for user logic design, processes UML class diagrams to generate test cases, and finally performs these test cases on cloud platform to reduce the burden of program. In this paper, we propose the whole process of building cloud services, elaborate the implementing methods and the challenges, and finally prospect the future research directions and key issues to be solved.

Model-driven Software Development Platform for Effectiveness Evaluation

HOU Zhi-hua, AI Zhong-liang

2014, 0(2):  41-45.  doi:10.3969/j.issn.1006-2475.2014.02.010

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During in process of effectiveness evaluation software development, the model developed in design process is highly similar to the effectiveness evaluation software architecture. However, traditional development isolates the design process and development process, which makes the shortcoming more obvious as the effectiveness evaluation becomes more and more complex, so how to make use of the model in design process is the key to advance efficiency of development. Model-driven effectiveness evaluation software development platform (EESDP) is proposed. EESDP treats calculate process as the model of effectiveness evaluation in design process, by model transformation and code generating, the effectiveness evaluation software is created, so it is efficient and easy to be used to develop the software.

 

Backstage Management System Code Generator Based on J2EE and Maven

WEI Ying

2014, 0(2):  46-50.  doi:10.3969/j.issn.1006-2475.2014.02.011

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The functions and mode of backstage management system are comparatively changeless. By applying code generation principle which is based on template technology, this paper designs a Maven-based code generator for backstage management system, fulfilling code generation from business model to backstage management system, in order to reduce repeated workload of software developers and project development cycle. From business document definition and analysis, to the template generation, the paper covers the code generator’s internal structure.

 

An Improved Algorithm for Workflow Scheduling in Cloud Environment Based on Graph Cut

DENG Bi-lin, WANG Yun-lan

2014, 0(2):  51-54.  doi:10.3969/j.issn.1006-2475.2014.02.012

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To improve the efficiency of workflow deployed in cloud environment, we applied multi constraint graph partitioning (MCGP) algorithm in workflow engine. Then ratio cut was introduced to MCGP to improve its efficiency. Simulation indicates that our scheduling policy can significantly improve the efficiency of the workflow.

 

Spatial Data Access Based on Data Registration Center and World Wind

WANG Meng-xue

2014, 0(2):  55-58+85.  doi:10.3969/j.issn.1006-2475.2014.02.013

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Traditional centralized databases and file systems cannot effectively handle the massive growth in data access and management, and are needed to adopt a distributed storage. Meanwhile, along with the rapid development of spatial information, GIS applications gradually come into people's lives. For spatial data access, this paper combines the data registration center with World Wind Java to achieve the spatial data access. First, by using the separately distributed storage way of metadata and data, KML is taken to organize and manage variety of spatial data attributes to realize the spatial data storage, and finally, World Wind Java is used to implement the read and display of spatial data, in order to effectively access the collected spatial data, provide services for applications, give full play to the role of data, and greatly reduce the burden of spatial data storage.

 

Transaction Control Strategy Based on Key-value Store

BAI Hao, ZHANG Yan-yuan, ZHANG Xiang-bin

2014, 0(2):  59-62.  doi:10.3969/j.issn.1006-2475.2014.02.014

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This article describes the advantages and development trends based on key-value storage. It also proposes ways to support transactions in the key-value storage model. New key-value storage database should have the ability of traditional database transaction and the new database transaction control requires a different strategy from traditional relational database. This paper describes the use of write-ahead log (WAL) and concurrent versions system (CVS) transaction control to meet the ACID properties.

 

Vector Spatial Database Based on Hadoop

MENG Hui, ZHU Mei-zheng, ZHANG Feng-ye

2014, 0(2):  63-68+72.  doi:10.3969/j.issn.1006-2475.2014.02.015

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Large GIS system stores huge quantity of vector data and needs to supply efficient service for multi-user concurrent access. Traditional design of spatial database cannot meet the requirement. To solve the problem of massive vector data storage in Large-GIS, we propose a new Hadoop-based method in this paper and demonstrate its effectiveness through an extensive experimental evaluation.

 

Presorting Grouping Algorithm for Skyline Computation

LIU Ping

2014, 0(2):  69-72.  doi:10.3969/j.issn.1006-2475.2014.02.016

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In this paper, we proposed the presorting grouping algorithm for skyline computation. This algorithm was based on SFS algorithm, and efficiently supported the preference of users. We proved that, for computing skyline, the number required comparisons between two points does not exceed m(n-m/2-1/2), where n being the number of points, and m being the number of skyline points; if the number of groups being k, then the number required comparisons used in the presorting grouping algorithm reduced m(m-k)/2k.

 

An Algorithm for Color Image Enhancement Based on Human Visual Property

SHU Dai-qun1, ZHU Hao1, SHENG Hui-xing1,2, LI Qing-wu1,2, ZHOU Jun2

2014, 0(2):  73-76+123.  doi:10.3969/j.issn.1006-2475.2014.02.017

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To enhance the dark areas of an image, a novel algorithm to enhance the color image based on global and local adaptation of the human visual regulation principles is proposed.The algorithm mainly consists of three parts: a preliminary global luminance adjustment followed by local contrast enhancement and color restoration. The global luminance adjustment increases the luminance of darker pixels based on nonlinear adaptive histogram stretching. The local contrast enhancement adjusts the intensity of each pixel based on its relative magnitude, which is based on its correlation between relative magnitude and the output of its neighboring pixels. Then an adaptive nonlinear color restoration process is applied to convert the enhanced intensity image back to a color image. The contrast experimental results based on a large set of images indicate that, the proposed image enhancement algorithm is adaptive, effective and rapid.

 

Hybrid Noise Estimation Based on Homogeneous Regions Segmentation in Hyperspectral Images

MENG Yu

2014, 0(2):  77-80+128.  doi:10.3969/j.issn.1006-2475.2014.02.018

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Reducing the noise in hyperspectral (HS) images to enhance image quality has been a hot research field of remote sensing image processing, but hybrid optoelectronic noise is difficult to precisely estimate. A new method for the HS hybrid noise estimation based on the homogeneous regions (HR) segmentation is proposed. The method makes HR segmentation by combining with spatial and spectral characteristics of the HS image first, and then removes correlation in regions by using multiple linear regression (MLR) to get the hybrid noise. Finally, the scale factor is introduced to estimate the internal parameters of the hybrid noise. The performance of this method is analyzed on simulated HS data and also applied to a well-known airborne visible infrared imaging spectrometer (AVIRIS) data. The experiment demonstrates this method improves the accuracies of segmentation and hybrid noise estimation when compared to other approaches.

 

Image Segmentation Based on Nonsubsampled Brushlet and Markov Random Field

LIU Xue-na, HOU Bao-ming, CUI Hong-xia

2014, 0(2):  81-85.  doi:10.3969/j.issn.1006-2475.2014.02.019

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In view of the shortages of conventional texture image segmentation based on Markov random field (MRF) in the wavelet domain, a segmentation method is proposed by combining nonsubsampled Brushlet transform and MRF. Nonsubsampled Brushlet transform is looked on as the feature field of the original image, which makes sure that the high dimensional singularity information of texture image is extracted effectively. And Gauss Markov model is used to compute the arguments of the feature field, which makes sure that the influences of the spectral information and the spatial correlations between pixels on the segmentation result are considered. Experiments show that this algorithm can effectively achieve the texture image segmentation and it is of more great improvement than traditional algorithm in the detection of texture direction information and regional consistency.

 

Lane Detection and Identification Algorithm Based on RGB Space

YANG Yi, HE Ying

2014, 0(2):  86-90.  doi:10.3969/j.issn.1006-2475.2014.02.020

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This paper proposes a new lane detection and color identification algorithm using color information. Firstly, the segments with prominent color difference and reasonable width were located. Secondly, the colors of the located segments were identified with color prior in RGB color space. Thirdly, the yellow and white color thresholds were estimated by the identified segments, respectively. Finally, the yellow and white lane markers were segmented with the thresholds. The experiments results showed that the proposed algorithm is able to estimate the thresholds for segmentation and identify the color of lane marker color and applicable in complex environments such as polluted roads or clutter background. The algorithm is simple, effective, and robust.

 

Improved Algorithm for Cell Microscopic Image Segmentation

XU Jia

2014, 0(2):  91-94+97.  doi:10.3969/j.issn.1006-2475.2014.02.021

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The development of modern medical science requires automation, efficiency and humanization, and the image segmentation technology is widely applied in this field. In this paper, an improved method derived from Otsu algorithm is put forward, according to the characteristics of the cell microscopic image. The algorithm is to achieve multiple segmentation, and improve its feasibility, effectiveness and applicability. The simulation results show that the performance of the improved algorithm is superior to Otsu algorithm.

 

Algorithm of Salt and Pepper Noise Reduction Based on Noise Analysis

HAN Li-na

2014, 0(2):  95-97.  doi:10.3969/j.issn.1006-2475.2014.02.022

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In view of the traditional median filtering reduction method little effect on removing salt and pepper noise of image, we proposed a method of reduction based on noise analysis. According to the characteristics of salt and pepper noise changing only the pixels portion of the image values of 0 and 255, the remaining pixels not, this method determines the noise and signal points of image. For the noise points, it calculates the number of signal in the neighborhood, and then decides to use the median of some neighborhood to replace it according to the number in order to remove the salt and pepper noise points. Simulation results show that the algorithm can effectively remove salt and pepper noise and preserve the edge details of image.

 

Key Technologies of Low-cost Individuation Manufacturing Prototype System

TONG Jing, CHEN Zheng-ming, LIU Jing, XU Xin

2014, 0(2):  98-101.  doi:10.3969/j.issn.1006-2475.2014.02.023

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Traditional manufacturing industries are generally based on massive production and the cost of individuation manufacturing is pretty high. Based on low-price devices of 3D scanning and 3D printing, an individuation manufacturing prototype system is presented. First, the personalized 3D shape is captured by using depth camera. The captured data from different views are denoised and registered, and a qualified mesh is generated by surface reconstruction. The personalized data are then sent to the designer for individuation product design. The generated model is sent back and the product can be manufactured by the user’s device or online 3D printing service. The proposed method is verified by the case of design and manufacture of personalized spectacle frame.

 

Report System Based on SaaS Model

JIANG Hou-ming1, REN Dong-xiao2, FENG Guo-li2

2014, 0(2):  102-105.  doi:10.3969/j.issn.1006-2475.2014.02.024

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This paper proposes a typical report system design in SaaS model, the key point is to systematically present a SaaS report system architecture by combining the characteristics of SaaS multi-tenant, high reusability and report system architecture. By redesigning and combining the traditional report function components in SaaS model, we solved the problem that the traditional reports were not applicable to the situation for large amount of data, high reusability and high usability, and proposed the specific technical means: unified data model, report multi-tenant, neutral format export, etc. The report system has been applied and verified in the state grid system, and achieves good results.

 

Operation Monitoring System for Mountain Flood Rain Stations Based on ASP

LI Chang, HU Xin-hua, HUANG Ling

2014, 0(2):  106-109.  doi:10.3969/j.issn.1006-2475.2014.02.025

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The system framework is based on B/S three-tier architecture. Based on the information of mountain flood stations, we use VB programming tools to judge the cases of mountain flood to be reported, and then generate real-time pictures. Using the Web design language ASP to program dynamic Web pages and to display picture files, we realize the fault site statistics, historical data query and data downloading. The application results show that: the system can effectively show the operation of each station to meet the development needs of the modern meteorological business, and ultimately bring convenience to prevent the torrents of geological disaster.

Sugar Cane Plantation Management System Based on WPF MVVM

PU Zhe, ZHU Ming-ri

2014, 0(2):  110-114+177.  doi:10.3969/j.issn.1006-2475.2014.02.026

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Aiming at the demands for sugar cane plantations information management, under the design pattern model-view-view model (MVVM), the Windows presentation foundation (WPF) technology is used to develop background management software of sugar cane plantation management system based on Internet of things in agriculture, which has functions such as sugar cane planting map management, collecting data query, land information management and grower management. The paper emphasizes the design architecture of background management system and the use of MVVM framework in system building, analyzes some key technologies such as the use of MVVM Light, NHibernate object, database mapping and so on. The system operates normally and stably, is of good stability and applicability, and could provide a scientific basis for the plantation of sugar cane.

 

A Desktop Simulator for Navigational Command Training

LIU Xi-zuo1,2, SONG Yuan2

2014, 0(2):  115-118.  doi:10.3969/j.issn.1006-2475.2014.02.027

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In order to solve the problem of having few chances and weak abilities to be on duty for the junior commanding officers, we established a desktop navigation command training system. This system founded the training scene database and used electronic chart data to form the 2D, 3D visual scenes and radar images. In addition, it used OpenGL Shading Language (GLSL) to simulate the fog environment and made the class of LightPoint in the OpenSceneGraph (OSG) to draw the ship navigation lamp. The developed system focused on meeting the training weakness of junior commanding officers to navigate under the condition of narrow channel, fog environment and being at night. It has been used in military training and achieved good results.

 

PBS-based Job Management for Exploration Data Processing

ZOU Jie, XU Tao, LIN Mao, LI Tie, LEI Hong-sheng

2014, 0(2):  119-123.  doi:10.3969/j.issn.1006-2475.2014.02.028

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High performance cluster does not have the functions of job automatic scheduling and load balancing. We use open source job management system to develop cluster management system in order to solve the problem that the cluster is difficult to use or manage. As an open source queue management and job scheduling system, PBS has been widely used in cluster management. Through developinga number of Shell scripts, the different types ofjobs are transformedinto the corresponding PBSjob scripts. Based on the actual situation of work mode in the enterprise cluster and the premise of less changing scientific research personnel work habit, by using the PBS system to make the necessary custom development work, the Paradigm company EPOS system cluster queue management and job distribution management are implemented.

 

An Extraction Method of Road Network Based on Walking GPS Trajectories

OUYANG Hong, LIU Jian-xun, LIU Yi-zhi, LIAO Zhu-hua, CHEN She-xi

2014, 0(2):  124-128.  doi:10.3969/j.issn.1006-2475.2014.02.029

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Accurately extracting and timely updating the information of road network is vital to road planning and vehicle navigation. Currently, the road network’s extraction method for mining urban trunk roads, based on GPS trajectories, commonly uses floating car or taxi. However, the existing methods ignore the automatic extraction of pathway, which is very important for earthquake relief, community navigation and village tour and other occasions. Therefore, this paper proposes a new method of road network extraction, based on walking GPS trajectories, which consists of three parts: data preprocessing, road centerline generation and road network accuracy evaluation. In this paper, three methods are adopted to generate road centerlines successively, such as trajectories clustering, cluster center segmentation and centerline fitting. Making experiment with self-collected walking GPS data, the results show that the proposed method not only is able to accurately extract the road network, coverage rate can reach 96.21% while error detection rate was 3.26%, but also can extract pathway and update road network.

 

A Spam Filtering Algorithm Based on Conditional Entropy

ZHAI Jun-chang1, CHE Wei-wei2

2014, 0(2):  129-132.  doi:10.3969/j.issn.1006-2475.2014.02.030

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In spam filtering, according to the filter misjudgment for legitimate mails, we put forward an improved spam filtering algorithm, which improves the conditional entropy estimation method of information gain. Combined with the Bayes minimum risk decision method, we analyze the algorithm through the recall and accuracy by carrying out an experiment on the English Corpus. Experimental results show that the improved algorithm can enhance the classification precision and reduce the misjudgment of legitimate emails, which can reduce the loss of users.

 

Group Argumentation Support System Based on Web

ZHAI Xing1, LI Zhi-xia2, HUANG You-liang1, LI Jian-zhi1

2014, 0(2):  133-137+141.  doi:10.3969/j.issn.1006-2475.2014.02.031

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Group argumentation support system (GASS) based on Webcan not only support cross-platform argumentation, but also can effectively manage the large number of speech information in the argumentation processes, as well as the consensus reached. Guided by meta-synthesis, the theoretical foundation, the system modeling, the basic framework and the method implementation of GASS are given in this thesis. Meanwhile, the thesis carries on an analog argumentation on the GASS in the theme of “the problem in the new rural cooperative medical system (NRCMS)”, which can verify the feasibility of the system and provide theoretical basis for the future research on the NRCMS at the same time.

 

Assessment of Coal Mine Safety State Based on Multi-sensor Data Fusion

XIONG Bo-jie, ZHOU Hua-ping

2014, 0(2):  138-141.  doi:10.3969/j.issn.1006-2475.2014.02.032

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In order to protect the safety of the coal mine workers and reduce economic losses, an assessment method for coal mine safety status based on multi-sensor data fusion was proposed. The data from sensors of gas concentration, temperature, wind speed, carbon monoxide, dust and others from the underground was first handled, the batch estimate pretreatment methods based on the average value were used to get the first level fusion result, and then the D-S evidence theory was used to eliminate the uncertainty in the assessment and improve the accuracy. At last, a specific case was used to verify the feasibility of the proposed method. The result shows that the assessment method is of a high degree of accuracy, and it can provide decision support for the assessment and judgment of the state of coal mine safety.

 

Embedded Network Communication Module Based on uC/OS-II

HAO Yu-sheng1, LU Yu-lan2

2014, 0(2):  142-146+153.  doi:10.3969/j.issn.1006-2475.2014.02.033

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In order to provide a small and resource saving network communication module for embedded system, after the transplantation of uC/OS-II, this paper introduces an embedded network communication module based on ENC28J60 and uIP stack, detailedly describes the register configuration methods, provides the chip initialization code, implements the driver of ENC28J60 and shows how to use uIP stack. Besides, a method is also proposed and implemented to fix the bug of uIP in UDP communication. The test results show that a TCP connection can be established between PC and evaluation board, UDP communication can also be carried on.

 

Relative Similar User Distributed Query Based on Local CDR Modeling

ZHANG Ze-xi1,2, WANG Yun1,2

2014, 0(2):  147-153.  doi:10.3969/j.issn.1006-2475.2014.02.034

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In many CDR (call detail record) based research and data mining applications, similar user query serves as a fundamental function. Traditional solutions are more like to be centralized query algorithms, however, the distributed nature of the production and storage of CDR posed a new problem: similar user distributed query. Based on real world data, we analyzed the relationships between local data and global data, designed and implemented a local CDR-based relative similar user distributed query (RSU-DQ) approach, and then evaluated its accuracy and efficiency.

 

Optimization of Two-stage Coordinated Virtual Network Mapping Algorithm

ZHENG Yong-wei, AI Zhong-liang

2014, 0(2):  154-158.  doi:10.3969/j.issn.1006-2475.2014.02.035

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Virtual network mapping problem is the key problem of virtual network, most of the previous studies focused primarily on link mapping after preselecting the node mapping based on heuristic algorithm. In order to reduce the resource cost and improve the acceptance rate of mapping with substrate resource utilization, this paper proposed an optimized two-stage coordinated algorithm by combing the link splitting and migration. Simulation results show that, this algorithm is of better acceptance ratio and benefit-cost ratio.

 

Android-based Emergency Command System

MU Xiao-bin1, YANG Li-na2

2014, 0(2):  159-163.  doi:10.3969/j.issn.1006-2475.2014.02.036

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Currently, the individuals for emergency are slow-footed, because they have a burden that needs to carry cameras, tape recorders, GPS, compass, mobile phones and other equipments. Meanwhile, they can not report their findings by the multimedia description in the first time. In this paper, we studied the Android system characteristics, the software programming, designed an Android emergency command system, and implemented an emergency command system prototype on Android. The Android devices with this system can be integrated a variety of requirements in order to reduce the burden of disposal site staffs, improve the interactive capabilities between the site and command center, and enhance the action ability of individuals.

 

PLC-based Control System of Integrated Pressure Casting

YANG Wei, YU Zi-rong, CHEN Li-juan

2014, 0(2):  164-167+172.  doi:10.3969/j.issn.1006-2475.2014.02.037

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Based on the design of the core modules such as apparatus main body, field control system, high-performance digital combination valve, control software and so on, we develop a multi-function anti-gravity casting system which integrates low-pressure casting, counter-pressure casting and adjustable-pressure casting. The fuzzy self-tuning PID method is used to control the production process in the apparatus operation process. It is convenient to realize the automation control of the integrated pressure casting system by the PC software, and the system has the characteristics of real-time parameter display and graphical display in casting process. The experiments show that the system is of multiple functions, strong practical applicability, can improve the automation degree and the control accuracy, and realizes the process automation of casting system.

 

Simulation System of Traffic Signal Control

NING Fang-dong

2014, 0(2):  168-172.  doi:10.3969/j.issn.1006-2475.2014.02.038

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In this paper, we introduce the design process of the simulation system of a traffic signal timing scheme, which uses MapX to establish GIS simulation interface, and is programmed by the C# language in Visual Studio 2010. By discussing in detail the function of each module of the system, the key technologies and principles to design and realize these modules, we realize a simulation environment which would provide a fully interactive interface to users, and it also realizes the simulation to the user timing plans, and feedbacks the evaluation parameters to the users. Experiments show that this system, in a certain extent, can make a realistic and objective simulation according to the user intention, and can provide a more accurate assessment, which demonstrates the effectiveness of this system.

 

Data Communication in Testing System of Electric Car BMS

YANG Liu-qian, ZHAN Chang-hui

2014, 0(2):  173-177.  doi:10.3969/j.issn.1006-2475.2014.02.039

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With the development of new energy automotive industry, the reliability of vehicle battery management system (BMS) is one of the key factors to ensure electric cars work reliable. We develop a BMS testing system which provides convenient testing method for testing and fault diagnosis of BMS. It achieves the functions of monitoring and testing the distributed BMS. This test system achieves the testing and monitoring between the upper machine and BMS by CAN communication to exchange the information. This paper focuses on the implementation method of CAN data communication between the upper machine and the BMS controller.

 

Vacuum Counter-pressure Casting Control System Based on S3C2440

ZENG Yan-long, YU Zi-rong, CHEN Li-juan

2014, 0(2):  178-181.  doi:10.3969/j.issn.1006-2475.2014.02.040

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This paper mainly introduces the design of vacuum counter-pressure casting control system which is made up of S3C2440 as the core, describes the systematic principle of its implementation, hardware composition and its corresponding software design. The ladle pressure can be controlled accurately by using the application programs of the system. In the process of casting, the system can display the parameters in real-time and graphically display the casting. What’s more, it will add so many functions, such as network transmission, storage, printing, and so on. The designed system is good for improving human-computer interaction and reliability of casting.

 

Pupil Light Stimulation and Measurement System Based on PSoC

SUN Han1, ZOU Yuan-wen1, LUO Yu-hao1, XIA Xun2

2014, 0(2):  182-185.  doi:10.3969/j.issn.1006-2475.2014.02.041

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The pupil light reflex measuring system is widely used in the field of fatigue detection and intracranial injury detection, etc. For the purposes of controlling the stimulated light source and measuring the light intensity conveniently, the paper designs a light stimulation and measurement system based on PSoC (Programmable System on Chip). The method of PWM is used to control LED, and an application on computer is programmed to control the PSoC changing the parameters of LED and gain the data of light intensity. The system is used in a real-time pupil parameter detective platform to provide the adjustable functions of light stimulation and measurement.

 

Gray Hole Detection: Watchdog Algorithm Based on Link Quality Estimation

JIANG Kun, WANG Yun

2014, 0(2):  186-190+196.  doi:10.3969/j.issn.1006-2475.2014.02.042

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Data transmission among wireless sensor network relies on cooperation between nodes, but nodes are easily captured by malicious intruder and then captured nodes launch gray-hole attacks, which thereby significantly reduce network performance. Existing detection algorithms mainly rely on statistical receiving and forwarding behavior to detect gray holes. But these algorithms can’t effectively distinguish natural loss due to unstable link quality of sensor network and the gray hole. To solve this problem, a watchdog algorithm based on link quality is proposed. To improve performance, this algorithm uses link quality to revise statistical observation and adjust the threshold according to the network environment. Simulation results show that the proposed algorithm can effectively reduce the false positive and false negative rate.

 

Improvement of Final Modular Exponentiation Algorithm in Tate Pairing Based on 250 Bits Modular Multiplication Platform

WANG Xiao-jing

2014, 0(2):  191-196.  doi:10.3969/j.issn.1006-2475.2014.02.043

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The purpose of this article is to realize the 457 bits final modular exponentiation in the Tate pairing Miller algorithm (one kind of bilinear pairings) of binary extension field on the hardware platform which only supports 250 bits modular multiplication. In the procedure of calculation, we adopted an improved Montgomery modular multiplication algorithm and Chinese remainder theorem algorithm. The final modular exponentiation will be realized with definite data, and we will use the mathematical software Sage to verify the improved scheme. So we can prove that this scheme can realize the 457 bits final modular exponentiation through theory analysis and data calculation.

 

An Embedded Algorithm for Gray Watermarking Image Based on DWT and DCT

DOU Yong-mei

2014, 0(2):  197-200.  doi:10.3969/j.issn.1006-2475.2014.02.044

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For embedding in the cover image are mostly binary watermarks, capacity is limited and needs to be improved anti-attack capability. In order to increase the capacity and enhance watermarking robustness of the algorithm, this paper proposes an embedded algorithm for gray watermarking image based on DWT and DCT. Firstly, the gray watermark image is preprocessed by Arnold scrambling. Secondly, after decomposing the selected cover image into the secondary layer, LL2, HL2, LH2 and HH2 of the secondary layer are selected to embed watermark. We apply 8×8 block DCT to each band and adopt an improved approach to embed high four bit planes of the gray watermark by switching two middle frequency coefficients. In order to enhance the robustness, the embedding intensity varies with different subbands. Finally, the simulation experiments show that the method is of strong robustness to cutting, image adding noise, histogram equalization, filtering, JPEG compression, and other attacks.

 

Network Intrusion Detection System Based on Protocol Analysis

YANG Yang, ZHAO Hong-song, YUE Yu-jian, DU Yuan

2014, 0(2):  201-204.  doi:10.3969/j.issn.1006-2475.2014.02.045

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Traditional network intrusion detection system has been unable to meet people’s demands of network security today. This paper presents a new design with internal rules and external rules based on protocol analysis. In external rules, a new threats description language is designed, which is similar to traditional programming languages, understandable and powerful. The internal rules enrich the logic in detection so that complex threats or even which with status can be detected. Compared with the system available, this new design is more accurate and more powerful.

 

Non-network Connection for Industrial Control Systems of Petrochemical Enterprises

MA Jun1, SHE Jun2

2014, 0(2):  205-208+234.  doi:10.3969/j.issn.1006-2475.2014.02.046

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When industrial control systems (ICS) in petrochemical enterprise access other information systems connected to Internet, they may suffer cyber attacks from external networks. In order to achieve secure data exchange between ICS of petrochemical enterprise and its corporate networks, a non-network formula which employed unilateral data transmission method is discussed in this paper. It discusses the principles of unilateral data transmission method and many security policies employed. In addition, the paper offers tests to prove that non-network formula can protect ICS in petrochemical enterprise from being tampered or attacked by hackers, Trojans or virus from Internet, and the design could ensure the safe running of ICS in petrochemical enterprises.

 

Simulation of Phased Array Radar Systems

WANG Tao-tao, WAN Xiao-dong, HE Jie

2014, 0(2):  209-212+218.  doi:10.3969/j.issn.1006-2475.2014.02.047

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The digital simulation of radar and the establishment of radar simulation libraries has become research hot spot in radar field in recent years. This paper mainly focuses on phased array radar system simulation. According to the composition and principle of phased array radar, it establishes the simulation model and mathematical model of phased array radar. Then, the paper does simulation and research on phased array radar system by choosing Simulink as the simulation platform. The simulation module mainly includes the antenna module, the signal environment module, the signal processing module and GUI man-machine interface module. Eventually it generates radar sub-libraries and forms phased array radar system, which lay the foundation for follow-up phased array radar study.

 

GPU-based Parallel Algorithm for Cross-correlation Extrapolation

WANG Xing, WANG Jie-jun, SUN Ning, WANG Yao

2014, 0(2):  213-218.  doi:10.3969/j.issn.1006-2475.2014.02.048

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To overcome the shortcomings of high time complexity and long computing time about cross-correlation extrapolation algorithm, an improved GPU-based fast parallel algorithm is presented, which is applied to extrapolate the Cloud-to-Ground flash development trend. First of all, we analyze the serial algorithm flow, and then design the parallel algorithm flow, optimize the algorithm by way of improving the data transfer between device memory and main memory, and optimize the memory access patterns. These optimization measures are based on OpenCL technology and aimed at the hardware architecture of AMD series GPU. Finally, we compare the Cloud-to-Ground flash monitoring data against the extrapolation results computed by this algorithm, and analyze the efficiency of the serial and the parallel algorithms under different precisions. The experimental result indicates that, the algorithm takes advantage of the powerful GPU parallel computing capability, and the calculation speed increases by nearly 17 times.

 

An Improved Clock Replacement Algorithm Based on Rule of Localization

WANG Zhen-ling, DING Chun

2014, 0(2):  219-221+225.  doi:10.3969/j.issn.1006-2475.2014.02.049

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This paper presents a new improved clock replacement algorithm to direct against defects of clock replacement algorithm based on the rule of localization. The organizational structure, design idea and implementation process of this clock algorithm are described. The proposed algorithm can minimize the I/O operations in page replacement.

 

Critical Section Mechanism Analysis and Custom Implementation

SHI Xiao-cun, ZHANG Xin-cheng

2014, 0(2):  222-225.  doi:10.3969/j.issn.1006-2475.2014.02.050

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In the process of Windows operating system extended, because using the custom scheduling, it required custom synchronization of threads, we need to customize synchronization mechanism. After analyzing the original implementation mechanism of critical section, we design a custom critical section. In the custom critical section design, we provide scheduling by using kernel driver development. Atomic operation of unsigned integer is used to guarantee the kernel object atomic operation. Memory mapping mechanism is applied to make kernel object address mapping for the user address, so that the operation can be completed in user mode and raise the operation efficiency. The experimental results show that the custom critical section can achieve the synchronization of threads.

 

Survey Data Read Automatically by Using VBA

TANG Yan, HAN Ai-qing, ZHAI Xing

2014, 0(2):  226-228+234.  doi:10.3969/j.issn.1006-2475.2014.02.051

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A large number of surveys data are collected by using Word document, but they can’t be efficient to obtain valuable information. This paper presents a solution by using VBA programming to multiple Word format document data, which automatically reads and summarizes the data to Excel, for further statistical analysis of data. After practice, the program works well.

 

Customizable Virtual Exhibition Hall

CHEN Long, WANG Quan-yu, ZHUANG Ning-kai, GU Zhen-qiang

2014, 0(2):  229-234.  doi:10.3969/j.issn.1006-2475.2014.02.052

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For the advantages such as large information capacity, multi-directional demonstration, vivid simulation and fully immersive, virtual exhibition hall is widely used in fields of exhibition, publicity, education and etc. However, difficulties of modification, poor reusability and generality are obvious defects of conventional virtual exhibition hall, so we put forward a new design method which enables users to customize virtual exhibition hall by using reserved interfaces, these interfaces provide user access to configure the exhibition hall models, exhibits and descriptions etc.In this way, users could get what they want by offering parameters and manual settings. In the paper, we firstly analyze the functional requirements of the system, secondly give the corresponding module divisions from three levels, bottom, middle and high. Then we give detailed overall framework of the system, and meticulously illustrate the solutions of technology problems that we met. Finally, the virtual exhibition hall could be produced according to the user’s configuration without modifying the program. The system increases the generality and reusability of the virtual exhibition hall, which benefits promotion and development of the virtual exhibition hall.

 

Design of Campus Intelligent Application System Video Based on Augmented Reality

LI Wen-xia, SI Zhan-jun, BAI Rui-feng

2014, 0(2):  235-238.  doi:10.3969/j.issn.1006-2475.2014.02.053

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Product publicity is an important part of the product sales and it plays an important role in the marketing of products. Augmented reality can increase the understanding of reality for people. Therefore, after studying 2D interface, 3D object dynamic design, shooting techniques and video synthesis, the paper finished the concept propaganda films of “Campus intelligent application system” which is based on augmented reality technology. It lays a foundation for the future product propaganda film production and future design of campus life.