Home > Archive > 2016 No. 03

2016 No. 03

Publish Date：2016-03-06
ISSN：0258-7998
CN：11-2305/TN
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Special Column-Discrete Signal Processing

The present situation and trend of discrete quantity signal processing

DOI：10.16157/j.issn.0258-7998.2016.03.001

Author：Wang Quan1,2，Xie Yunxiang3，Hui Xiaoqiang1，2

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068，China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design,Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China

Abstract：The dispersed quantity processing circuit is important basic components in the field of electronic control. The dispersed quantity processing circuits are also gradually to miniaturization, high integration, intelligent direction, with the development of microelectronics technology. This paper introduce the dispersed quantities firstly, compare the discrete quantity processing circuit development present situation at home and abroad, discuss the future trend of development on dispersed quantity processing circuit according to the actual development needs.
Key word：
discrete quantity signal processing
intelligent
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Aviation discrete input mechanism and design realization

DOI：10.16157/j.issn.0258-7998.2016.03.002

Author：Hui Xiaoqiang1，2，Li Chang3，Deng Gaungzhen3

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068,China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China

Abstract：With the development of microelectronics technology , as an important part of modern electronics control systems , discrete input interface processing circuit from the traditional discrete components to build a more complex circuit is gradually developing towards the direction of a simple and reliable integrated circuits . This paper begins with the basic functions of discrete input circuit are introduced , then the course of development of discrete input interface processing circuit implementation and the advantages and disadvantages of various processing circuit were analyzed and compared , and finally to the domestic HKA03201 chip , for example summarized the airborne avionics systems using integrated circuit processing discrete signal of superiority.
Key word：
discrete input
signal processing
HKA03201
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A discrete quantity input interface chip design and implementation

DOI：10.16157/j.issn.0258-7998.2016.03.003

Author：Shao Gang1，2，Lang Jing3，Xie Yunxiang3

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068，China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China

Abstract：According to the large quantity of IC device, the huge weight, the high occupancy rate of board area and the low stability, the traditional discrete signal interfaces are no longer able to meet requirement which aviation airborne system request for miniaturization, integration and high reliability. In this paper, a discrete quantity input interface chip based on the port active leakage, SCR structure port protection circuit and error isolation is designed to enhance the reliability of data. The weight and size of this chip are reduce to 0.5 percent of the traditional circuit and the power consumption is only 0.7 percent of the traditional circuit. It effectively solve problem of the aviation airborne system during the process of collecting the discrete signa miniaturization, integration and reliability issues.
Key word：
discrete magnitude signal
input interface
chip
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Aviation discrete output mechanism and design realization circuit

DOI：10.16157/j.issn.0258-7998.2016.03.004

Author：Cai Yefang1，2，Shao Gang1，2，Li Chang3，Xie Yunxiang3

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068，China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China

Abstract：Discrete output processing circuit avionics system is an important part of the basic circuit processing , has been with the development of integrated circuit design built from complex separation device transition to integrated , intelligent direction. In this paper, avionics systems discrete output interface circuit and principle of implementation, the first of discrete output circuits function and introduced, from the basic principles and the development process of discrete output interface processing circuits to achieve the various processing circuits and comparative analysis of the advantages and disadvantages, and finally to the domestic HKA2330 chip, for example summarized the airborne avionics systems using integrated circuit processing discrete signal superiority.
Key word：
discrete output
signal processing
HKA2330
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One solution of interface of the discrete quantity based on chip

DOI：10.16157/j.issn.0258-7998.2016.03.005

Author：Yang Feng1，2，Suo Gaohua3，Xie Yalong3

Author Affilications：1.AVIC Computing Technique Research Institute，Xi′an 710068，China； 2.Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design，Xi′an 710068，China； 3.Xi′an Xiangteng Microelectronics Technology CO.，LTD，Xi′an 710068，China

Abstract：Traditional discrete quantity processing solutions have not met the requirements of the system miniaturization and high reliability because of applying the discrete device structures, which resulted in large volume, area, weight and low reliability, and BIT takes up more hardware resources. This paper puts forwards one solution of interfaces of the discrete quantity based on domestic self-development chips. The design of this solution is simple and flexible, integrated with functions such as self-text, redundancy, error check and fault isolation and so on. Besides, the solution has great advantages in power consumption, cost, area, and weight. So, the solution can be widely used in aviation electronics, industrial control and other area.
Key word：
discrete magnitude signal
interface circuit
HKA03201
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Review and Comment

Power management technology of datacenters

DOI：10.16157/j.issn.0258-7998.2016.03.006

Author：Wang Xin1，2，Zhang Zheng3，Zhang Weihua1，2

Author Affilications：1.Software School，Fudan University，Shanghai 201203，China； 2.Shanghai Key Laboratory of Data Science，Shanghai 200433，China； 3.State Key Laboratory of Mathematical Engineering and Advanced Computing，Zhengzhou 450001，China

Abstract：With the arrival of “big data era”, varieties of datacenters constitute the infrastructure of IT industry. With the expansion of amount and capacity, the power consumption issue of datacenter draws more and more concern of academia. Nowadays, with the development of techniques like power capping, job scheduling, new materials, and renewable energy, datacenter researchers progress a lot at increasing the power efficiency and reducing the carbon emission. This paper concludes the mainstream technology adopted in power management of datacenter and discusses the trend of power management systems.
Key word：
datacenter
power management
renewable energy
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Research and development of flip-chip packaged MEMS piezoresistive pressure sensors

DOI：10.16157/j.issn.0258-7998.2016.03.007

Author：Zhang Diya1，2，Liang Ting1，2，Yao Zong1，2，Li Wangwang1，2，Zhang Rui1，2，Xiong Jijun1，2

Author Affilications：1.Key Laboratory of Instrumentation Science & Dynamic Measurement(North University of China)， Ministry of Education，Taiyuan 030051，China； 2.Science and Technology on Electronic Test & Measurement Laboratory，North University of China，Taiyuan 030051，China

Abstract：The paper introduces not only advantages over flip-chip bonding technology of MEMS piezoresistive pressure sensor packaging,but also research on key technology in the realization of flip-chip bonding of pressure sensitive chip. According to the different between the design of packaging structure and substrate materials,the research achievements of flip-chip packaging at home and abroad described in detail. Finally,the paper summarizes the development prospects and present challenges of sensor flip-chip package.
Key word：
pressure sensor
flip-chip bonding
packaging
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Microelectronic Technology

Design and implementation of the improved structure of DDS based on FPGA

DOI：10.16157/j.issn.0258-7998.2016.03.008

Author：Wang Shuo，Ma Yongkui，Gao Yulong，Zhang Shiwei，Zhao Donglai

Author Affilications：Communication Research Center，Harbin Institute of Technology，Harbin 150001，China

Abstract：The principles and spectrum of digital frequency synthesizer(DDS) have been introduced in this paper. Three methods that constitute the improved structure of DDS have been given, including the ROM compression algorithm that saves storage space, the phase jitter injection method that restrains phase truncation error, and the balanced DAC structure method that reduces the influence of its non-ideal characteristics. Stray interference caused by the periodicity of the random sequences, employed for phase jittering, has been analysed through simulations. Moreover, this paper has also implemented the improved structure of DDS in an universal FPGA platform. The test results show high stability and spurious suppression which is better than 40 dBc, when the improved DDS is used for frequency hopper.
Key word：
DDS
spurious suppression
phase jitter
FPGA
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High speed and low power driver realization of Flash based on RAM mapping

DOI：10.16157/j.issn.0258-7998.2016.03.009

Author：Li Jie，Ren Yongfeng，Li Huijing

Author Affilications：National Key Laboratory for Electronic Measurement Technology，North University of China，Taiyuan 030051，China

Abstract：Considering the reliability and power consumption problems of FPGA in modern NAND Flash chip controlling, a new design method based on FPGA internal memory mapping for finite state machine(FSM) is proposed. In this way, transfer information and output information will be mapped to internal memory resources of FPGA, by means of controlling the address of memory to implement the state transfer of FSM, and reading data in corresponding memory address to implement state transfer information and corresponding output. The controller clock and combination of the combinational logic to avoid the unnecessary flip of signal greatly improve the reliability of working and reduce the dynamic power consumption. The practice shows that this method can reduce the resource consumption and the power consumption more than 50% of the traditional FSM, which provides a new way in the realization of complex sequential logic.
Key word：
FSM mapping
dynamic power consumption
controller clock
division of the combinational logic
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Integrated Pop-Click noise suppression system for class-D audio power amplifier

DOI：10.16157/j.issn.0258-7998.2016.03.010

Author：Wang Shaoqing，Ye Chunhui，Hu Yangcong

Author Affilications：SI-EN Technology Xiamen Ltd.，Xiamen 361005，China

Abstract：Integrated Pop-Click noise suppression system for class D audio power amplifier application is presented. A novel soft start control of output driver and an auxiliary feedback loop circuits ensure the stability of class D loop and the integrality of output power stage, realize the good Pop-Click noise suppression. A class D audio amplifier that integrated with the Pop-Click noise suppression system was implemented in 0.5 ?滋m CMOS process. The measurement result shows that at 0 dB gain setting and 8 Ω speaker loading the amplifier can suppress the Pop-Click noise to 1.5 mV.
Key word：
class D audio power amplifier
soft start
auxiliary feedback loop
Pop Click noise suppression
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Design and analysis of inexact floating-point multiplier

DOI：10.16157/j.issn.0258-7998.2016.03.011

Author：Yin Peipei

Author Affilications：Computer Center，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

Abstract：With the increasing extending the scope of digital operation and demands of digital precision, the study of floating-point(FP) arithmetic has become more important. But the complex hardware, high power consumption and long delay of traditional floating-point arithmetic unit restrict the performance of floating-point arithmetic. An inexact circuit offers a promising approach to significantly reduce both dynamic and static power dissipation for error-tolerant applications. To solve the above problems, the inexact floating-point multiplier is proposed by approximately designing a mantissa multiplier. High dynamic range(HDR) images are processed using the proposed inexact floating-point multiplier to show the validity of the inexact design，comparison results show that the proposed inexact floating-point multiplier has a good property.
Key word：
floating-point
inexact
multiplier
HDR
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Design and implementation of communication mechanism for a shared-clock multithreading processor

DOI：10.16157/j.issn.0258-7998.2016.03.012

Author：Lei Xiaofeng1，Li Tao2

Author Affilications：1.School of Computer，Xi′an University of Posts and Telecommunications，Xi′an 710061，China； 2.School of Electronic Engineering，Xi′an University of Posts and Telecommunications，Xi′an 710061，China

Abstract：Multicore and multithreaded processors is a development direction of parallel technology.This paper design a shared_clock multithreading processor for multicore and multithreaded processors. It has two communication mechanisms: the neighbor communication and the thread-thread communication. The neighbor communication conveys information by the neighbored shared FIFO and thread-thread communication conveys information by shared memory.This can improve resource utilization and parallel executing capacity.
Key word：
shared-clock multithreading processor
neighbor communication
thread-thread communication
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ASIC design and implementation of a LTE-A frame timing synchronization scheme

DOI：10.16157/j.issn.0258-7998.2016.03.013

Author：Dai Wenqiang，Li Guiyong

Author Affilications：Chongqing University of Posts and Telecommunications，Chongqing 400065，China

Abstract：The paper researches a frame timing synchronization algorithm based on synchronization signals in TD-LTE-Advanced system, simulate the algorithm, do some necessary analysis and propos a realization scheme. Then, the strategies and scheme of ASIC realization are determined according to the precision, area, power consumption and other requirements, and the ASIC realization of frame synchronization module and FFT module are completed. Finally, through simulation, verification and logic synthesis,results show that the module can reach the expected goals of the functions. The ASIC design in this thesis has advantages in both power consumption and area size，by comparing with the similar module, the area of the ASIC design in this thesis is smaller about 8.8 percent, power consumption is lower about 9.3 percent.
Key word：
LTE-A
frame synchronization
timing synchronization
ASIC
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Embedded Technology

The design of the remote heads of geological hazard displacement monitoring terminator based on PIC32

DOI：10.16157/j.issn.0258-7998.2016.03.014

Author：Zhao Xiaojun，Zhan Zhao，Zhou Xisi

Author Affilications：School of Electronic Information Engineering，Hebei University，Baoding 071000，China

Abstract：The remote heads of geological hazard displacement monitoring terminator based on PIC32 processor as the core, equipped with laser rangefinder. The terminal using the advantage that non-contact measuring of laser ranging sensor and stereo space rotation function of PTZ to realize real-time data acquisition and on-line monitoring of geological disasters in the three-dimensional space. This paper introduces components of the displacement monitoring terminal of geological hazard body, focus on terminal measurement principle, software and hardware design of terminal control panel. Terminal device has the advantages, such as simple structure, data acquisition, and it′s transmission process has good real-time performance and reliability.
Key word：
PIC32
laser ranging
geological hazard
monitoring system
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Design of a metal object detection positioning system device

DOI：10.16157/j.issn.0258-7998.2016.03.015

Author：Huang Hu，Tang Hui

Author Affilications：School of Information Science and Technology，Chengdu University of Technology，Chengdu 610059，China

Abstract：Taking MSP430 as the core of control system, using LDC1000 inductor digital converter as a metal object probe, using 42BYGH hatchback hybrid stepping motor scanning, LCD12864 LCD displays the location of metal objects, designed a metal detector can be autonomous mobile positioning system means changes caused by eddy current effects of metal coil is energized the magnetic field accurately detect metal objects. The hardware circuit and software flow of system are introcluced. After testing, coins and homemade hoop in 50 cm×50 cm detection zone, the system can accurately locate the scan coins and hoop area.
Key word：
single chip microcomputer
inductance sensor
stepper motor
automatic scanning
accurate detection
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Implementation of equipment management system based on Contiki OS and active RFID

DOI：10.16157/j.issn.0258-7998.2016.03.016

Author：Dong Kun，Chen Bo，Zhao Zhongquan

Author Affilications：Research Institute of Electronic Science and Technology，University of Electronic Science and Technology，Chengdu 611731，China

Abstract：In this equipment management system，we designed a kind of active RFID reader node and edge router that could form a wireless sensor network. Users could order the reader nodes collect and manage the RFID tags attached to the equipment. The scale of deployment of this system is as large as the same WSN. Because of the RFID reader nodes,the system could be less complicated and have low power consumption. The system is suitable for managing equipment.
Key word：
Contiki
active RFID
WSN
embedded system
edge router
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Design of 6LoWPAN border router based on Contiki

DOI：10.16157/j.issn.0258-7998.2016.03.017

Author：Tian Guangdong，Ye Xin

Author Affilications：School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications， Chongqing 400065，China

Abstract：This paper chooses CC2538 SoC as the core hardware platforms, relying on Contiki, to design a 6LoWPAN border router. Meantime, a temporarily network, including a PC connected to the Internet, 2 6LoWPAN nodes and a 6LoWPAN border router is created to evaluate the performance of the 6LoWPAN border router. The result shows that the 6LoWPAN border router can forward the data packets between the PC and 6LoWPAN nodes. This 6LoWPAN border router can be applied to some scenario such as smart home, environment monitor and so on.
Key word：
6LoWPAN
Contiki
border router
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Design and development of self-help book collection facility

DOI：10.16157/j.issn.0258-7998.2016.03.018

Author：Liang Guangsheng，Cui Wenzhe

Author Affilications：College of Electrical and Electronic Engineering，North China Electric Power University，Beijing 102206，China

Abstract：To solve the low rate efficiency of book recycling, a book collection facility based on STM32F103RC with propitious prospect is proposed. Abandoning wired host-slave communication and power supply line, wireless powering circuit is implemented, which makes the mechanic part more succinct and reliable. A serial port expansion module is designed to push through limitation of serial-pin number, making more interactive functions possible. By simply inserting a book in this facility, the book is collected into it automatically meanwhile the relevant information is updated to the server. The whole process is tested to be both reliable and practicable.
Key word：
book
STM32
collection
serial expansion
View(7990)

Design of high-definition endoscopic camera system based on USB3.0

DOI：10.16157/j.issn.0258-7998.2016.03.019

Author：Zheng Zhibo，Jiang Guiping

Author Affilications：School of Biomedical Enginnering，Southern Medical University，Guangzhou 510515，China

Abstract：This article is designed for high-definition endoscopic camera system based on USB3.0 interface,which has the advantages as follows:simple structure,low-cost,easy to carry,high-definition image quality,high transmission speed(5 Gb/s)and plug and play and hot swappable support equipment,free drive advantages and so on. This article designs the overall structure of the system,including the design of power management system,image acquisition and processing system and the USB3.0 transmission system.CYUSB3065,the main chip,contros the entire system,OV5640,the image sensor chip,collects and processes the image data,which is transmitted to the host via USB3.0 interface,and then the captured video images are displayed in media player software,finally,image output 1080p Full HD Video.
Key word：
endoscope
camera system
USB3.0 interface
image sensor
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Measurement Control Technology and Instruments

The optimization design and implementation of Sobel image edge detection algorithm

DOI：10.16157/j.issn.0258-7998.2016.03.020

Author：Li Jinming1，2，Yan Xiaojun1，2，Jiang Xudong1，2，Wen Jie1，2，Huan Tao3

Author Affilications：1.Key Laboratory of instrumentation Science & Dynamic Measurement of Ministry of Education， North University of China，Taiyuan 030051，China； 2.National Key Laboratory for Electronic Measurement Technology，North University of China，Taiyuan 030051，China； 3.Capital Aerospace Machinery Company，Beijing 100076，China

Abstract：For the issues of large noise and rough edges in image edge detection based on Sobel operator, an optimized design scheme is proposed. A fast median filter module is added to improve the anti noise capability of the system in front of the traditional Sobel edge detection module. At the same time, the non maximum suppression module is added to further thinning the image edge behind the Sobel edge detection module, which effectively preserves the edge of the image, and improves the image edge sharpness. Compared with the traditional Sobel detection module, the optimized scheme not only can effectively suppress the noise, but also get more thin edge of the image and enhance the effect of real-time image processing, which has been successfully applied to an image recognition system.
Key word：
Sobel operator
edge detection
fast median filtering
non maximum suppression
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Research and implementation of Web key technologies based on LXI bus

DOI：10.16157/j.issn.0258-7998.2016.03.021

Author：Qin Binyi1，2，Qiu Jie3，Zheng Jincun1，Dong Jiyou4

Author Affilications：1.Electronic and Communication Engineering College，Yulin Normal University，Yulin 537000，China； 2.School of Elecrto-Mechanical Engineering，Xidian University，Xi′an 710071，China； 3.Computer Science and Engineering College，Yulin Normal University，Yulin 537000，China； 4.Department of Student Affairs，Yulin Normal University，Yulin 537000，China

Abstract：LXI bus is a new generation of instrument bus technology which is following the GPIB, VXI and PXI traditional bus technology. It has the incomparable advantage over traditional instrument bus. Among them, the Web page is a key of LXI bus technology. This paper researches Web pages of LXI instrument and puts forward a realization method of the Web page in LXI instruments, which take an example of the realization of the IEEE1588 synchronization configuration page. This method realizes the Web page by transplanting boa server and SQLite database into Linux. At the same time, traditional CGI global refresh is replaced by CGI local refresh. Finally the system is verified, the browser is used to control of LXI instruments by remote access. The experimental results show that the system can realize IEEE1588 right synchronization configuration page.
Key word：
LXI
IEEE1588
embedded Web serve
embedded database
CGI
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Design of gas alarming system based on wireless communication technology

DOI：10.16157/j.issn.0258-7998.2016.03.022

Author：Qiao Ziqiang1，Liu Jin1，2，Zhou Dongping3

Author Affilications：1．College of Safety Engineering，Chongqing University of Science & Technology，Chongqing 401331，China； 2．Chongqing Energy Investment Corp.，Chongqing 401121，China； 3．Chongqing Energy Technology Investment Group Co.，Ltd，Chongqing 400061，China

Abstract：Directed at the phenomenon of false alarming and absent alarming in the existing domestic gas alarming system, a gas alarming system is designed based on wireless communication technology, which can achieve the double alarming function for gas leakage and detection. The core of this system is Cortex-A9 processor ZigBee, CC2530 module GPRS, SIM900A module RAM, the data is collected through semiconductor gas sensor MQ-5 and wireless transmission is carried out through ZigBee network and GPRS network. The alarming signals of gas leakage and detection are sent to the users and residential monitoring center, meanwhile, the windows are opened and the indoor sound alarming and exhaust fans are switched on. The system is low in cost, high in efficiency and simple in operation, so it can meet the safety requirements of domestic gas.
Key word：
gas alarming
ZigBee
MQ-5
wireless communication
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Remote data acquisition system for water photosynthetically available radiation based on wireless bridge

DOI：10.16157/j.issn.0258-7998.2016.03.023

Author：Song Tingting1，Luo Ruilong1，2

Author Affilications：1.Shanghai Engineering Research Center of Hadal Scicence and Technology，Shanghai 201306，China； 2.Hadal Science and Technology Research Center，Shanghai Ocean University，Shanghai 201306，China

Abstract：A new remote data acquisition(DAQ) system for underwater photosynthetically available radiation measurement and remote monitor is described in this paper. The system was developed with LabVIEW platform. The high definition EM-9636BD DAQ card was used to collect multiple water parameters with acquisition rate up to 250 kHz and control the sensors′ vertical speed with a step motor, simultaneously. The system adopted a pair of wireless bridge with low price which can transmit data to the computer monitor 3 to 5 km away. The test results show the system has a high reliability and good safety performance.
Key word：
wireless bridge
LabVIEW
photosynthetically available radiation
remote data acquisition
View(6242)

A design scheme of distributed message middleware for SCADA system

DOI：10.16157/j.issn.0258-7998.2016.03.024

Author：Shi Yaozheng1，Ku Liuheng2

Author Affilications：1.Hohhot Railway Bureau，Hohhot 010020，China； 2.National Computer System Engineering Research Institute of China，Beijing 100083，China

Abstract：With the development of distributed SCADA system in railway traction power supply application, the data transfer between nodes in SCADA system and other heterogeneous systems is faced with the problems such as lower efficiency, and the interface is not uniform. Aiming at this problem, this paper proposes a design scheme of distributed SCADA message oriented middleware based on publish / subscribe model. The scheme uses the N-Tree structure to divide the system message into a logical area, and designs a set of perfect message passing and feedback processing mechanism. In the scheme, the Quorum-Based algorithm is used to ensure the consistency of the distributed nodes. Practice and simulation experiments prove that this scheme improves the message passing efficiency of SCADA system, and reduces the running load and communication overhead of the distributed system.
Key word：
SCADA
Quorum
distributed system
middleware
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Research of video monitoring system for plant seedlings breeding based on SOPC

DOI：10.16157/j.issn.0258-7998.2016.03.025

Author：Yi Yi1，2，Yan Xuelong1，Hao Jianwei2

Author Affilications：1.School of Electronic Engineering and Automation，Guilin University of Electronic Technology，Guilin 541004，China； 2.Institute of Information Technology，Guilin University of Electronic Technology，Guilin 541004，China

Abstract：In the course of using magnetoelectric field induced breeding processing equipment for the plant seedlings, operators are susceptible to magnetoelectric field radiation. In order to solve this problem, a video monitoring system for plant seedlings breeding based on the SOPC(System on a Programmable Chip) technology is purposed. The article introduces the system composition and principle of the scheme, the hardware and software implementation method, and experimental test. The test results show that the method is feasible. It can satisfy the demand of real-time video monitoring, and produce cost-effective plant seedlings created good conditions. Meanwhile the method could avoid the operator under magnetic field radiation.
Key word：
Nios II soft core
video capture
FPGA
image processing
measurement and control system
View(8520)

Communication and Network

Query tree feature extraction based on data mining for detecting SQL injection attack

DOI：10.16157/j.issn.0258-7998.2016.03.026

Author：Zhang Yan

Author Affilications：Ningxia Vocational Technical College of Industry and Commerce，Yinchuan 750021，China

Abstract：For the issues that the database information in Web application is vulnerable to SQL injection attack, a method of defense SQL injection attack based on data mining is proposed, and its core lies in the query tree feature extraction and conversion. First, the internal query tree is collected in the SQL database log. Then, the query tree feature is converted into an n-dimensional character feature vector by using the multidimensional sequences as the intermediate representation. Then, according to the query tree type, it uses different statistical models to convert character feature vector into the n-dimensional numerical characteristics vector. Finally, the SQL attack detection is detected by using the polynomial kernel function SVM according to these features. Experimental results show that the proposed scheme can effectively improve the correct detection rate of SQL attacks.
Key word：
data mining
SQL injection attack
query tree
feature conversion
polynomial kernel SVM
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Implementation of variable-rate resources scheduling algorithm of wireless HART node

DOI：10.16157/j.issn.0258-7998.2016.03.027

Author：Feng Ansong1，2，3，Wang Hong1，4，Zhang Yanwu4

Author Affilications：1.Shenyang Institute of Automation Chinese Academy of Sciences，Shenyang 110016，China； 2.College of Information Engineering，Shenyang University of Chemical Technology，Shenyang 110142，China； 3.University of Chinese Academy of Sciences，Beijing 100039，China； 4.Microcyber Corporation，Shenyang 110179，China

Abstract：Resources scheduling in the wireless HART is implemented by allocating super frame. The research of resource scheduling algorithm in the wireless HART network is mainly used in the occasion of fixed rate node now. The super frame is divided into data super frame and management super frame in the paper. This paper proposes a kind of data super frame allocating algorithm for the node that uplink the data by variable speed. According to the characteristic of uplink data in the data super frame, the data frame allocating algorithm that enhance immunity to a disturbance is proposed by the average allocation time slot in the data frame. The experimental results show that the algorithm solves the resource allocation problems of variable rate of network node in the wireless HART and improves the end-to-end data transmission of resistance to interference.
Key word：
wireless HART
resources scheduling
data super frame
management super frame
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Physically unclonable function based high performance privacy protection algorithm of RFID network

DOI：10.16157/j.issn.0258-7998.2016.03.028

Author：Zhou Enhui1，Liu Yana2

Author Affilications：1.College of Mathematics and Information Science，Hebei Normal University，Shijiazhuang 050024，China； 2.College of Mathematics and Information Science，Shijiazhuang University，Shijiazhuang 050035，China

Abstract：RFID network is an important solution for the identification of Internet of Things, the security of RFID system impacts the security of the Internet of Things directly. The existing RFID privacy protection algorithms need to search the backend database to validate a tag, so that the database has a high computational complexity and delay. Thus a physical unclonable function based low computational complexity privacy protection algorithm which does not need searching the database is proposed. Firstly, PUF is used to store the secret information of the tags securely to resist the compromising attack. Then, three hash function and two XOR computation are needed for database and it′s computational complexity is O(1). Lastly, the proposed algorithm is analyzed based on the RFID privacy and security model proposed by Vaudenay. The results show that the proposal realize the best privacy level and the lowest computational complexity.
Key word：
RFID network
Internet of Things
privacy protection
physical unclonable function
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Accurate acquisition method of BOC signals in norrowband interference environment

DOI：10.16157/j.issn.0258-7998.2016.03.029

Author：Jiang Xiaolei，Zhang Tianqi，Zhao Juntao

Author Affilications：Chongqing Key Laboratory of Signal and Information Processing，Chongqing University of Posts and Telecommunications， Chongqing 400065，China

Abstract：Aiming at the two problems that channel interference affects the correctness of binary offset carrier(BOC) signals transmission and ambiguous acquisition of binary offset carrier(BOC) signals caused by its auto-correlation,a lapped FFT based on frequency domain algorithm and relevant reconstruction method are proposed to capture the BOC signals with norrowband interference. Firstly, the received BOC signals are processed by overlapping windows transform to greatly reduce signals spectrum leakage and the loss of signals.Then the norrowband interference will be suppressed with the frequency domain notch filter technology.Finally,the received BOC signals which have been processed are captured by the relevant reconstruction method.The simulation results show that the proposed algorithm can effectively suppress the norrowband interference.Besides in one SNR and norrowband interference environment,the error rate can reduce to zero and the performance of capture is not influenced by norrowband any more. Compared with other algorithm，it has high precision of capture.
Key word：
BOC signals
overlap transform
norrowband interference suppression
relevant reconstruction
accurate acquisition
View(7992)

Performance analysis and simulation of muitiuser interference in THMA-UWB communication system

DOI：10.16157/j.issn.0258-7998.2016.03.030

Author：Zhao Hongmei，Wu Yanan

Author Affilications：College of Electric and Information Engineering，Zhengzhou University of Light Industry，Zhengzhou 450000，China

Abstract：This paper presents a performance comparison of THMA-UWB for multi-user wireless communication systems. MUI effects arising form the introduce of multi-user in THMA-UWB system and hence induce time-of -arrival(TOA) based positioning inaccuracy. The Standard Gaussian Approximation(SGA) channel is considered. This paper mainly consists of two steps：(1)the error bit rate of THMA-UWB system for orthogonal binary pulse position modulation with time hopping(2PPM-THMA-UWB) and binary pulse amplitude modulation with time hopping(2PAM-THMA-UWB) are deduced.(2)we will evaluate the performances of MUI effect by different number of users, rate bits, pulse forming factor under SGA. Simulation results show that 2PAM-THMA UWB system performs much better compared to 2PPM-THMA UWB system, higher bit rate and smaller pulse forming factor could lead to good performance,even with a high number of users.
Key word：
UWB
SGA
MUI
2PPM
2PAM
Time Hopping Multiple Access(THMA)
View(8574)

Computer Technology and Its Applications

A dynamic threshold segmentation method based on bidirectional polynomial fitting

DOI：10.16157/j.issn.0258-7998.2016.03.031

Author：Yu Chengbo，Kong Qingda，Qian Zewen，Yu Yujie

Author Affilications：Institute of Remote Test and Control，Chongqing University of Technology，Chongqing 400054，China

Abstract：This paper researched the uneven illumination problem of the corneal endothelial cell images，using contrast limit adaptive histogram equalization(CLAHE),homomorphic filter to enhance image. Meanwhile the paper proposed a dynamic threshold segmentation method based on bidirectional Polynomial fitting, each row and column vectors of image matrix were fitted in both direction get threshold matrix. Then the value of each point for threshold matrix obtained were compared with the value of each point for image matrix to obtain final binary segmented image, the method retained details which uneven illumination image easily lost. Finally mathematical morphology operation is used such as image hole fill,image erosion and dilation,image thinning to get the feature image of corneal endothelial cell. Experimental results demonstrate that segmentation results and real-time of this method have sig-nificantly improved, compared with OTSU method, NiBlack method and several algorithms.
Key word：
adaptive histogram equalization
homomorphic filter
binary segmented
dynamic threshold
View(9696)

Printed document identification with cascade classifier based on multi-feature

DOI：10.16157/j.issn.0258-7998.2016.03.032

Author：Zhou Jingjing，Chen Qinghu，Peng Wenhua，Yan Yuchen

Author Affilications：School of Electronic Information，Wuhan University，Wuhan 430072，China

Abstract：Printed document identification is a kind of technology which is widely used in the security field. So it needs higher accuracy and speed. Considering the information of a single feature is not complete, this paper improves the accuracy based on multi-feature. The research process includes data acquisition, image preprocessing, GMM and LBP feature extraction, feature fusion, SVM classifier and cascade detector. Through extracting the GMM and LBP features from 4 000 image sets, the feature fusion is performed, and the results show that the proposed method can improve the accuracy and speed of the identification in a certain extent.
Key word：
gaussian mixture model
local binary pattern
feature fusion
cascade classifier
print document identification
View(6736)

Recognition for motor imagery signal based on improved LMD

DOI：10.16157/j.issn.0258-7998.2016.03.033

Author：Zhao Limin，Zhu Xiaojun，Gao Xurui

Author Affilications：College of Computer Science and Technology，Taiyuan University of Technology，Jinzhong 030600，China

Abstract：For the non-stationary and non-linear characteristics of electroencephalogram(EEG), this paper proposes a classification method based improved local mean decomposition(LMD) for motor imagery signal. Firstly, combining the improved LMD with window principle to select imagery signal of 4～6 second as classification data, and extract components PF that contain ?滋 rhythm and β rhythm. Secondly, the sample entropy of corresponding components PF is calculated. Finally, the EEG is classified with support vector machine(SVM) and evaluated by the accuracy. The experiment results indicate that the improved LMD algorithm is better than traditional LMD algorithm in classification accuracy, which turns out the effectiveness of proposed approach.
Key word：
local mean decomposition
window principle
sample entropy
PF components
support vector machine
View(7634)

Implementation of an attention monitoring system based on Android

DOI：10.16157/j.issn.0258-7998.2016.03.034

Author：Kong Liang，Hu Nan，Sun Bing

Author Affilications：School of Electronic and Information Engineering，Soochow University，Suzhou 215006，China

Abstract：EEG Biofeedback is a new treatment rising recent years for Attention Deficit Hyperactivity Disorder (ADHD). It is now widely used in clinic, but the treatment needs to be done with expensive, heavy and professional equipment which causing it hard to promote. In this paper, an attention monitoring system based on Android was designed utilizing BP neural network and ThinkGear AM EEG acquisition chip launched by NeuroSky, it can realize real-time monitoring of EEG and direct display of attention level. The system is simple, portable and cheap, it has certain significance for the promotion of EEG Biofeedback.
Key word：
attention
EEG
monitoring system
BP neural network
View(8602)

Maintenance cycle based on continuous time MDP model and stochastic decision

DOI：10.16157/j.issn.0258-7998.2016.03.035

Author：Ao Yinhui，Wang Cuifen

Author Affilications：College of Electromechanical Engineering，Guangdong University Technology，Guangzhou 510006，China

Abstract：The maintenance strategy of production system is directly related to life of equipment. And it effects the continuous and reliability of production line, product quality, production efficiency and satisfaction rate etc. This paper uses the continuous-time MDP model to study the maintenance strategy of single device. And it considers the dynamic of transition probability and the random of scheme selection, by simulation and optimization to obtain the optimal maintenance strategy in Matlab software. It is applied to the series and parallel structure, compared with discrete space MDP maintenance. The results show that maintenance strategy based on continuous-time MDP model can effectively improve performance of production system, reduce costs and improve production efficiency.
Key word：
continuous-time MDP model
maintenance strategy
the dynamic of transition probability
the random of scheme selection
MATLAB optimization
series and parallel structure
View(8726)

Super resolution image reconstruction algorithm based on gain map and local regularization

DOI：10.16157/j.issn.0258-7998.2016.03.036

Author：Zhu Li

Author Affilications：Collge of Computer，Xi′an University of Science and Technology，Xi′an 710054，China

Abstract：Owing to these defects such as blurring effect and ringing effect, caused by the current image reconstruction algorithm for the ill-posed multi-frame super-resolution image, this paper proposes an effective mechanism based on local adaptive regularization for image reconstruction. First, by analysis of the sub-pixel shifts in low-resolution image, the high and low resolution formation model is constructed, and by estimate an HR image, the reconstruction problems are transformed into an unstable linear equations. Then, a regularization operator is constructed, combined modified algebraic reconstruction technique for the solution of the linear equations. Finally, the gain control method based on local adaptive regularization is used to realize construction of gain map, and complete the SR image reconstruction. The simulation results show that comparing with current image reconstruction algorithm, the reconstruction performance of this mechanism is better, which effectively reduces the blurring effect and ringing effect under the condition of LR image.
Key word：
image reconstruction
sub-pixel
regularization operator
local adaptive
gain map
super-resolution
View(7818)

Gauss improved harmony search algorithm based passive electronic components FLFNN signal detection

DOI：10.16157/j.issn.0258-7998.2016.03.037

Author：Jia Zhijie，Liu Fan，Gan Degang

Author Affilications：State Grid Sichuan Electric Power Research Institute，Chengdu 610072，China

Abstract：According to the proble of low efficiency and precision in using existing methods for detecting the signal intrinsic parameters, the functional link neural fuzzy network(FLFNN) and improved Gauss harmony search algorithm were combined to design signal detection model for passive electronic devices. Firstly, the functional link neural network concept was used to be the fuzzy rules for the output layer of fuzzy neural network, with which FLFNN network model was designed. Secondly, the Gauss was used to design improved harmony search algorithm. And then the FLFNN network model parameters were encoded, which realized the optimization of its parameters. Finally, the parameters′ selection for Gauss improved harmony search algorithm were analyzed through simulation experiments, and then three signal detection models were compared by experiment, which showed the Gauss improved harmony search algorithm based passive electronic components FLFNN model has higher prediction accuracy.
Key word：
Gauss harmony search
functional link
fuzzy neural network
passive electronic components
signal detection
View(6114)

Power Supply Technology and Its Application

Design of power harmonic disturbances generator based on DSP

DOI：10.16157/j.issn.0258-7998.2016.03.038

Author：Wang Su′e1，Hu Yicheng1，Zhang Yixi2

Author Affilications：1.College of Electrical and Information Engineering，Shaanxi University of Science & Technology，Xi′an 710021，China； 2.School of Automoble，Chang'an University，Xi′an 710064，China

Abstract：The power harmonic disturbances generator based on DSP, which has set harmonic number and harmonic content, controlled the time of harmonic injection and dynamic response fast. To achieve zero static error of tracking for many AC signals of different frequency, this paper uses improved repetitive control strategy. Building the system model in MATLAB/ Simulink and simulating. Then using the method of model-based design, automatic code generation, which can overcome the long development cycles, code testing and verify of the traditional power electronic development mode. Eventually, experiment on the 3 kW prototype. Experimental results show that the output voltage′s error precision of power harmonic generator is less than 3%, which can meet the performance requirements of testing electrical equipments.
Key word：
harmonic
DSP
repetitive controller
model design
View(15192)

Design and simulation of active clamp flyback circuit by Saber

DOI：10.16157/j.issn.0258-7998.2016.03.039

Author：Li Zhijun，Qin Xiaoxue，Zhang Xuantao，Liu Hanzheng，Liu Shuang

Author Affilications：Hebei University of Technology，Control Science and Engineering Academy，Tianjin 300130，China

Abstract：This paper sketches the circuit′s structure and principle of the flyback converter, and aimed at the existing problems, it puts forward the active clamp flyback circuit. Also, its working process is analyzed and discussed. On that basis, it has designed the parameters of the key devices in the active clamp flyback circuit. Finally, it builds the simulation model based on the Saber software to verify the analysis results. The simulation results show that if we introduce the active clamp circuit, it can not only make full use of the energy transmission loss caused by the leakage inductance of isolation transformer, but also can make the main and auxiliary power switch devices realize the ZVS, and it effectively reduces the voltage stress and switching loss of power switch devices. At last it further enhances the efficiency and reliability of the converter.
Key word：
flyback converter
switch loss
active clamp
simulation
View(17094)

Research on three-level forward-flyback DC/DC converter

DOI：10.16157/j.issn.0258-7998.2016.03.040

Author：Dou Youting，Ma Haixiao，Ye Haiyun

Author Affilications：Nanjing University of Posts and Telecommunications，Nanjing 210046，China

Abstract：With the rapid development of high voltage and high-power technology, integration and high-frequency have always been the pursuit of a goal in the power electronics. The conventional three-level converter can decrease the switch voltage stress, but the circuit has low power density. Forward-flyback converter with high magnetic core utility ratio can limit the input-voltage range. In this paper, a novel three-level forward-flyback DC/DC converter which combines the forward-flyback with the three-level is proposed for wide input voltage range and high transform power. In addition, the advanced magnetic integration technology can be employed to integrate the four windings into a magnetic core, which decreases the volume and quality of the transformer and further improves the power density.
Key word：
three-level
forward-flyback
integrated transformer
DC/DC converter
View(9610)

Design of nonlinear electronic load for power supply test

DOI：10.16157/j.issn.0258-7998.2016.03.041

Author：Yu Zixi，Xie Yue

Author Affilications：College of Mechanical and Electrical Engineering，China Jiliang University，Hangzhou 310018，China

Abstract：Resistance and rectifier bridge are often used to build nonlinear load for the steady performance test of AC power supply,but this method has the drawbacks of inconvenience of parameters adjustment and low lever automation. Therefore,a nonlinear electronic load with good flexibility is designed.In this paper a reference current numerical algorithm is proposed by analyzing the voltage and current relations of the reference nonlinear load specified in the national standard GB/T7260.3-2003. The electronic load working as the desired nonlinear load to the power supply is realized by digital hysteresis current control,and the equivalent output power can be adjusted by pulse width modulation method. A 1.5 kVA prototype based on STM32F103 controller is set up.The feasibility and correctness of the proposed scheme is verified by experimental results.
Key word：
nonlinear electronic load
power supply test
numerical algorithm
hysteresis current control
STM32F103
View(9882)

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