2017 No. 03-Application of Electronic Technique

Special Column-Heterogeneous Computing

Evaluation of homogeneous and heterogeneous multi-core System-on-Chip

DOI：10.16157/j.issn.0258-7998.2017.03.001

Author：Huang Letian1，Bie Lihua2

Author Affilications：1.University of Electronic Science and Technology of China，Chengdu 610054，China； 2.College of Informatics，Huazhong Agricultural University，Wuhan 430070，China

Abstract：The system level chips are the most important devices of high-end electronic system and the multi-core system on chips are the main architectures of system level chips. The multi-core system on chips are well developed by the researchers and engineers. Unfortunately，the evolution path of the multi-core system is too complex to understand because of different applications and researchers’ background. So，the history of the evolution path of the multi-core system is discussed and concluded in this paper. It would help the reader to understand the history and the future of multi-core system on chips.

Key word：
multi-core system on chips

CMP

MPSoC

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Design of high-speed interface of motion controller based on the heterogeneous multi-core

DOI：10.16157/j.issn.0258-7998.2017.03.002

Author：Liang Jianhong，Luo Liang，Liu Zhigui，Wan Boyu

Author Affilications：College of Information Engineering，Southwest University of Science and Technology，Mianyang 621000，China

Abstract：With the development of the embedded motion control system, the embedded controller based on heterogeneous multi-core will be one of the important development directions. In this paper, it firstly describes the effectiveness of heterogeneous multi-core controller, as well as the defects of existing controller in data communication interface. The heterogeneous processor“OMAPL138+FPGA” is the core of the motion controller in this design, OMAPL138 internal integrated ARM9 and DSP C6748 processor core. ARM9 has embedded Liunx operating system to enhance the coordination of multi-tasking controller. And DSP does not run the operating system to ensure real-time computing. This paper focuses on ARM and DSP, DSP and FPGA and the high-speed interface design and firmware design of the communication between controller and PC. Experiments show that the data exchange rate of the motion controller , the throughput and the stability are high, which provides reference for the high speed communication interface of heterogeneous multi - core controller.

Key word：
heterogeneous multi-core

motion controller

high-speed interface

OMAPL138

FPGA

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Design and implementation of large FFT convolution on heterogeneous multicore programmable system

DOI：10.16157/j.issn.0258-7998.2017.03.003

Author：Zhang Duoli，Shen Xiulei，Song Yukun，Du Gaoming

Author Affilications：Institute of VLSI Design，Hefei University of Technology，Hefei 230009，China

Abstract：Nowadays FFT convolution is widely applied to digital signal processing(DSP), and the past few years have witnessed the development of the heterogeneous multicore programmable system(HMPS). In addition, HMPS has been the mainstream in the field of DSP. So it is very important to study the high efficient implementation of large FFT convolution on the HMPS. In this paper, a high efficient pipelined overlap-add filter based on the overlap-add FFT convolution method is designed for the input streaming data. This paper introduces the implementation of large FFT convolution on the HMPS and achieves the high accuracy of filter result. Furthermore, a pipeline technology is adopted for the filter design to improve processing speed, throughout and parallelism of tasks. The Xilinx XC7V2000T FPGA verification result shows that the larger sampling points are involved in computing, the higher task parallelism, processing speed and throughout will be obtained. When the sample points reach 1M, the system average task parallelism is 5.33 with 2.745×106 clock cycles and the precision of 10-4.

Key word：
FFT convolution

overlap-add

algorithm mapping

task parallelism

heterogeneous multicore

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Review and Comment

Research on communication security technology of electric power monitoring system

DOI：10.16157/j.issn.0258-7998.2017.03.004

Author：Hu Zhaohui，Wang Fangli

Author Affilications：Electric Power Research Institute of Guangdong Power Grid Co.，LTD，Guangzhou 510080，China

Abstract：Power industry is an important industry related to national interest and people's livelihood, and the security of electric power monitoring system is related to the safety of power production. With the arrival of Industry 4.0, the security of electric power monitoring system is under unprecedented test. First, it describes the typical communication security problems in power monitoring system, second, it analyses the weakness of the current solution. At the end of this paper, we propose a new solution based on trusted network connection and industrial communication whitelisting.

Key word：
electric power monitoring system

communication security

trusted network connection

industrial communication whitelisting

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Microelectronic Technology

Design of a high-input voltage regulator for LED drivers

DOI：10.16157/j.issn.0258-7998.2017.03.005

Author：Su Yijun1，2，Ma Kui1，2，Hu Rui3，Chen Xiao3，Yang Fashun1，2

Author Affilications：1.Department of Electronics，Guizhou University，Guiyang 550025，China； 2.Key Laboratory of Micro-Nano Technology of Guizhou Province，Guiyang 550025，China； 3.Guizhou Zhenhua Feng Guang Semiconductor Co.Ltd.，Guiyang 550018，China

Abstract：In LED driving chips, traditional high-voltage regulator, which uses buck DC-DC converter or cascade clamp of MOSFET to drop the high-input voltage to the power supply for internal low voltage modules is seriously affected by the high-voltage process and not easily integrated. In this paper, an improved high-voltage regulator was proposed. This regulator uses a current mirror composed by LDMOS to charge a RC circuit. The voltage on the capacitor is regulated by a linear regulator to provide a stable low voltage power supply. Therefore, the LED driving circuit can be integrated in a monolithic chip except the capacitor. This high-voltage regulator was simulated based on the HG 0.5 μm 700 V BCD process. The simulation result shows that the output voltage is 4.97 V under the condition of pulse high voltage for 0～311 V period. The output voltage fluctuation value is 0.116 V and the load regulation is 11.6 mV/mA in the load current of 0～10 mA. The temperature coefficient is 27.2 ppm/℃ within -40 ℃～130 ℃. The simulated results indicate that all parameters of this high-voltage regulator are validated.

Key word：
LED driver

high-voltage regulating circuit

linear regulator

low-voltage power supply

BCD process

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Design of a multi-layer AXI bus based on the crosspiont-queued crossbar

DOI：10.16157/j.issn.0258-7998.2017.03.006

Author：Hu Chunlin1，2，Wang Zhen2，Wang Shenzhuo1，2，Wang Jian2，Xu Dacheng1

Author Affilications：1.School of Electronic and Information Engineering，Soochow University，Suzhou 215006，China； 2.CNIGC，Suzhou 215163，China

Abstract：With in AXI Bus，there are many restrictions for the inter-core communication which lead to AXI Bus seem hardly to meet the growing performance requirement of multi-processor System-on-Chip.This paper presents a multi-layer AXI Bus which introduces crosspiont-queued structure to connect cores instead of traditional connection structure.Through modeling and simulation analysis by Simulink,the most optimum buffer lengths of crosspiont-queued can be confirmed. After times all round simulating for code of this design by VCS，result shows that the design can realize total function which an on-chip communication architecture should possess.

Key word：
AXI Bus

multi-processor SoC

crosspiont-queued

multi-layer Bus

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RF small-signal noise equivalent circuit modeling of 45 nm MOSFET

DOI：10.16157/j.issn.0258-7998.2017.03.007

Author：Wang Dandan，Wang Jun，Wang Lin

Author Affilications：College of Information Engineering, Southwest University of Science and Technology，Mianyang 621010，China

Abstract：RF equivalent circuit modeling and parameter extraction techniques for 45 nm MOSFET device are presented and verified. After accurately extracting the RF small-signal model parameters, on the basis of the noise correlation matrix of two-port networks and on the multiport noise theory, the noise sources in the intrinsic circuit embed all the components that contribute to the thermal RF noise, then RF noise parameters were analytically derived, which are compared to RF measurements of a commercial state-of-the-art 45 nm CMOS process, showing very good accuracy in corresponding frequency regime.

Key word：
equivalent circuit

RF small signal

noise parameter

parameter extraction

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Design of fault-tolerant router for online FIFO fault detection on network-on-chip

DOI：10.16157/j.issn.0258-7998.2017.03.008

Author：Hang Yanxi，Xu Jinfu，Chen Songtao，Guo Pengfei

Author Affilications：PLA Information Engineering University，Zhengzhou 450001，China

Abstract：To meet the realtime fault-tolerant requirement of FIFO in the network-on-chip router, a method for online fault detection and fault tolerance of FIFO fault is proposed. Firstly, the function model and fault model for router FIFO are established; on the basis of this, a real-time testing algorithm for the fault of the FIFO in the network-on-chip router is put forward by using the test address generation method; then a FIFO redirection mechanism is proposed to tolerant FIFO faults. The experiment shows that the impact induced by test circuit can be down to a small range. The throughput and delay can be greatly improved with fault injected.

Key word：
network-on-chip

router

FIFO

fault-tolerant

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The temperature field distribution analysis of IGBT module in the interconnected system

DOI：10.16157/j.issn.0258-7998.2017.03.009

Author：Pi Kaiyun，Cui Haoyang，Li Xiang，Li Xin，Shu Jiang

Author Affilications：College of Electronics and Information Engineering，Shanghai University of Electric Power，Shanghai 200090，China

Abstract：Temperature affects the reliability of the insulated gate bipolar transistor(IGBT) module. The traditional power electric coupling simulation model can only be measured IGBT module offline cases a junction temperature, can’t get the actual working conditions temperature field distribution on the surface of the chip. In this paper, on the basis of the traditional power cycling test simulation considering the voltage in the process of IGBT turn-off graded, the voltage as the load by using numerical simulation software ANSYS thermal analysis environment module temperature field distribution of achieved by finite element analysis method, analyzes the temperature field distribution characteristics of known high temperature area in all round the edge of the active region. The above analysis to study the reliability of the IGBT module and the module of online monitoring has certain guiding significance.

Key word：
interconnected system

IGBT module

MATLAB/Simulink

ANSYS

temperature field distribution

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Design of NCO based on improved CORDIC algorithm

DOI：10.16157/j.issn.0258-7998.2017.03.010

Author：Wang Shenzhuo，Hu Chunlin，Hu Guangyin，Xu Dacheng

Author Affilications：School of Electronic and Information Engineering，Soochow University，Suzhou 215000，China

Abstract：Numerically Controlled Oscillator(NCO) has been widely applied in many fields，including digital signal processing and software defined radio. NCO based on the conventional CORDIC has disadvantages of low operation frequency, low precision, and high consumption of resources. To solve these problems, a design of NCO is presented in this paper by improving the conventional CORDIC, the phase and amplitude of a one-to-one corespondence is realized, extends the convergence range to the entire circumference, and the sine and cosine waveforms are completely orthogonal. The simulation results showed that the design has advantages of high speed, low resource usage and simple structure, the maximum clock frequency is 114.3% higher than the NCO which is based on the traditional CORDIC algorithm, and the accuracy is improved to 10-5~10-6.

Key word：
NCO

CORDIC algorithm

precision

pipeline

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Embedded Technology

Scheme of a in-system program updating based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.03.011

Author：Zhang Yongle，Wang Yongyong，Zheng Wei

Author Affilications：Beijing Aerospace Wanyuan Science&Technology Corporation，Beijing 100176，China

Abstract：A in-system programming updating scheme based on XILINX FPGA is proposed. The product software functions can be updated with no destruction of hardware status and no need for adding extra devices.As all of the operations on PROM are implemented by means of FPGA′s logic resources,the scheme has good portability and scalability.

Key word：
FPGA

in-system program

JTAG

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Self-restorable design of low voltage protector based on fast RMS algorithm

DOI：10.16157/j.issn.0258-7998.2017.03.012

Author：Li Yuanxi1，2，Yang Guohua1，2，Zou Xiuguo3

Author Affilications：1.Jiangsu Research and Development Center of Application Technology for Wireless Sensing System，Wuxi 214153，China； 2.IOTE Department，Wuxi Institute of Commerce，Wuxi 214153，China； 3.College of Engineering，Nanjing Agricultural University，Nanjing 210031，China

Abstract：This article presents an improved design of mechanical low-voltage protector with self-restorable function. Through sampling the input voltage in a same monotone interval, calculating current effective values quickly by reformed derivative algorithm and judging with the threshold value, the device uses inner motor to drive gear groups to switch the mechanical protector, besides, when the voltage fault is removed, the device restores the protector in ON state automatically. The article, firstly, introduces the principle, structure and circuit design of self-restorable protector, then analyzes the advantages and disadvantages of fast root mean square(RMS) algorithm and gives some improved method. Finally, experiments compare the data comprehensively under different voltage and analysis in reliability & effectiveness of break protection and recovery function.

Key word：
self-restorable

fast RMS algorithm

over & under voltage protection

circuit break protector

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Design of KW01-ZigBee wireless sensor network application development platform

DOI：10.16157/j.issn.0258-7998.2017.03.013

Author：Cai Bofeng1，2，Cai Weida3，Wang Yihuai1

Author Affilications：1.School of Computer Science and Technology，Soochow University，Suzhou 215006，China； 2.College of Information and Technology，Taizhou Vocational and Technical College，Taizhou 225300，China； 3.School of Astronautics，Northwestern Polytechnical University，Xi′an 710072，China

Abstract：To solve the problems of great difficulty and long cycle in wireless sensor network (WSN) application development, through analyzing causes of these problems and present situation of WSN application development technology deeply, according to software engineering thought and the basic theory of component, a four-layer architecture development platform model was presented. According to the model, the paper designed a KW01-ZigBee-based WSN application development platform which had a clear architecture,rich external interface and complete hardware and software components. The design of development board,hardware and software components and the engineering framework were discussed in detail. The example engineering and its test result showed that the platform was correct, practical and easy to use, could reduce technical difficulty of development and improve development efficiency.

Key word：
wireless sensor network

design of development platform

KW01-ZigBee

component design

engineering framework

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Research on frequency tracking system of wide-band ultrasonic power supply based on FPGA

DOI：10.16157/j.issn.0258-7998.2017.03.014

Author：Su Wenhu，Chen Xun

Author Affilications：School of Electronic Information，Jiangsu University of Science and Technology，Zhenjiang 212003，China

Abstract：For conventional ultrasonic power supply,there exists problems of driving and locking of different frequency transducer,and the problems of wide-band phase locking loop and frequency automatic tracking,a new type of wide-band ultrasonic power supply with frequency automatic searching and tracking,dynamic matching different ultrasonic transducers has been developed based on Field-Programmable Gate Array(FPGA).According to the impedance characteristics of the transducer,a new method with dynamic step has been designed to search the resonance frequency of the ultrasonic transducer and then the master processor real-time adjusts the output frequency,locks the system at resonance state according to the phase of voltage and current from the feedback circuit.The experimental result shows that the design of the wide-band ultrasonic power supply has the advantages of quick frequency searching and accurate frequency tracking,and it also improves the adaptability of dynamic matching of different transducers.

Key word：
frequency searching

frequency tracking

wide-band ultrasonic power supply

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Firmware online upgrade implementation for wearable devices based on simulating BIOS

DOI：10.16157/j.issn.0258-7998.2017.03.015

Author：He Guofeng，Li Yueting，Liu Yuhong

Author Affilications：College of Big Data and Information Engineering，Guizhou University，Guiyang 550025，China

Abstract：Wearable devices need to upgrade its system constantly in order to achieve a good user experience，and in this process，product update method and security make the most intuitive. Focusing on the wearable devices based on MSP430 MCU，though studying how the program start inside the chip and then referencing the step of how BIOS load system on computer，this paper diveded the Flash into different spaces,one for BIOS,and the other two were simulated to C drive and CD-ROM.At last，it released a scheme for online update.

Key word：
wearable device

online upgrade

BIOS

embedded

Flash

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Measurement Control Technology and Instruments

Design of IO expansion module based on EtherCAT slave station

DOI：10.16157/j.issn.0258-7998.2017.03.016

Author：Lin Zhihang，Gao Junli，Xu Chaolan，Jiang Jie

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

Abstract：In order to solve the demand problem of digital IO application of slave station in current EtherCAT communication network , this paper proposes the easy-realizable industrial digital IO expansion plan based on the embedded EtherCAT slave station which realizes the integration of microprocessor and ESC, and explains the design process of relevant software and hardware in detail. The experimental result shows that this combined system of slave station and digital IO expansion module can realize the real-time collection and output of multiple digital signals and achieve the expectant design requirements.This design is worthy of reference for application development based on EtherCAT slave station.

Key word：
EtherCAT

slave station

IO expansion

SPI

SYS/BIOS

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Design and implementation of home assistant robot system based on Kinect

DOI：10.16157/j.issn.0258-7998.2017.03.017

Author：Dang Hongshe，Hou Jinliang，Zhang Chao

Author Affilications：College of Electrical and Information Engineering，Shaanxi University of Science and Technology，Xi′an 710021，China

Abstract：In order to make the elderly, patients and children get better care, a home assistant robot system based on Kinect is designed. Single server multi clients model is used to design the system, the clients Kinect and App are connected to the server. The assistant robot is designed and the IP camera is used as the head ,the steering joint structure is used as the arm and the wheels are used as the leg of the robot. Applying the improved Kinect motion recognition algorithm，the function of motion-control is achieved. The medication bottles and cups can be taken to the elderly and patient by the robot. The APP is designed to realize the function of remote monitoring and video cheat with the elderly and patients.

Key word：
Kinect

robot

motion recognition algorithm

APP

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The research and implementation of smart Bluetooth thermometer based on Android

DOI：10.16157/j.issn.0258-7998.2017.03.018

Author：Fang Tianen1，Qi Jing1，Ma Jinhui2，Liu Deqing1，Zhang Zhaoyang1

Author Affilications：1.Mobile Communication Technology Key Lab.，Chongqing University of Posts and Telecommunications，Chongqing 400065，China； 2.Wireless Transmission Technology Research Laboratory， Chongqing University of Posts and Telecommunications，Chongqing 400065，China

Abstract：In view of the increasing demand for smart thermometer, the Bluetooth smart communication system is designed combining with the most popular Android smart terminal and Bluetooth low power communication technology, which is in order to realize temperature data real-time transmission and display. The system utilizes cc2541 chip which based on BLE technology, and utilizes MF52A2 thermistor temperature sensor for temperature collection and Bluetooth module within the cc2541 chip to collect the data and then send the data to the Android App end in a wireless method. Through the system performance testing, the results show the system runs stably with good real time and high quality ,which can satisfy the real-time monitoring of device temperature.

Key word：
CC2541

Bluetooth

Android

temperature measurement

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Research of improved indoor WiFi localization algorithm based on Android platform

DOI：10.16157/j.issn.0258-7998.2017.03.019

Author：Wu Yi，Zhang Jizhao

Author Affilications：School of Electronic and Information Engineering，Hebei University of Technology，Tianjin 300400，China

Abstract：This article designed and implemented the WiFi indoor positioning system on the Android mobile phone platform. The system uses fingerprint positioning algorithm,collects indoor WiFi information through the mobile phone and establishes the database. When a user sends a location request, mobile phone will scan the WiFi information，send them to the database，and do location based on matching algorithm. The positioning accuracy is improved by weighting to the collected data. In advance,the data in database is processed. It reduces the amount of computation, and at the same time removes the interference of the signal strength of the smaller. The experimental results show that the positioning accuracy of the system is greatly increased compared with the traditional algorithm.

Key word：
indoor positioning

WiFi

Android platform

fingerprint algorithm

improved algorithm

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Study of the control system of multi-functional air purifier based on STM32

DOI：10.16157/j.issn.0258-7998.2017.03.020

Author：Zhang Peng1，Feng Xianying1，2，Huo Rui1

Author Affilications：1.School of Mechanical Engineering，Shandong University，Jinan 250061，China； 2.Key Laboratory of High Efficiency and Clean Mechanical Manufacture，Ministry of Education，Jinan 250061，China

Abstract：For indoor air purifiers,which were paid more and more attention,this paper developed an air purifier control system based on STM32. The control system realized a set of functions,including eight common polluted gas detection,temperature ＆ humidity detection,key operation,infrared detection,fan driving,UV disinfection,negative oxygen ions purification and LCD display. The comprehensive pollution index was applied to evaluate indoor air quality for the first time and multiple low-decibel fans were used for low noise and high winds. The control system has advantages of good stability, simple operation and can be cut and packaged based on demand functions, which is mainly applied in air purifiers for house places such as bedroom, kitchen, drawing room and so on.

Key word：
air purifiers

STM32

control system

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The design of intelligent shoe system based on Internet of Things

DOI：10.16157/j.issn.0258-7998.2017.03.021

Author：Wang Jiaquan，Wang Hao，Chen Shaoyong，Huang Qijun，Chang Sheng，Wang Hao，He Jin

Author Affilications：School of Physics and Technology，Wuhan University，Wuhan 430072，China

Abstract：Aiming at the problems of traditional shoe single function and easy mold rot and so on, a kind of intelligent shoe cabinet system based on the Internet of Things is designed. The intelligent control system has been realized by using the STM32 microcontroller embedded with intelligent control algorithm. The partition processing method is used and dampness devices are installed in the shoe cabinet. The use of sensors installed, with sterilization deodorant and dampness mold function module of the shoe, deals with the humid air inside the shoes and shoes smell. The use of Internet of Things technology, combined with the cloud server and client，can achieve real-time viewing shoe information, remote intelligent control and other functions. Experiments show that the system can effectively remove the smell of shoes, prevent mildew and keep the shoe fresh air.

Key word：
intelligent shoe

Internet of Things

STM32

cloud server

client

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Research on temperature monitoring system for distribution network equipment based on RFID sensor

DOI：10.16157/j.issn.0258-7998.2017.03.022

Author：Guan Zhiyuan，Zhang Zhousheng

Author Affilications：Electric Power Engineering，Shanghai University of Electric Power，Shanghai 200090，China

Abstract：The temperature measurement of the key points of the charging equipment in the distribution network system, especially the fully enclosed equipment has been the difficulty in the operation of the power equipment inspection. Aiming at the disadvantages of the traditional temperature monitoring, this paper proposes a passive wireless temperature monitoring system based on radio frequency technology. This article mainly expounds the key technologies of the monitoring system and the implementation scheme of the switchgear, and discusses the feasibility of the system through experiments. The system can not only on-line monitoring the electric equipment’s temperature of each key point, but also make a temperature measurement network, realize the unified monitoring and management, and solve the problem of the difficult to measure the key points of charging equipment.

Key word：
distribution network equipment

RFID

temperature

online monitoring

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Communication and Network

The research of spectrum allocation strategy for cognitive radio network based on graph coloring theory

DOI：10.16157/j.issn.0258-7998.2017.03.023

Author：Chen Jianbin1，Zhao Zhiyuan2，Chen Zhang1，Yang Lin1

Author Affilications：1.Nanjing Telecommunication Technology Institute，Nanjing 210007，China； 2.National Defense Information Academy，Wuhan 430010，China

Abstract：In order to solve the problem of dynamic spectrum allocation in cognitive radio network, the spectrum allocation model for cognitive radio network was analyzed and put forward by using the graph coloring theory. Then based on the Maximal Independent Set algorithm(MIS), the integrated allocation weight was introduced in this paper. According to the weight, a dynamic spectrum allocation algorithm based on the channel benefit was proposed. Simulation results show that the proposed algorithm has better performance in utilization and fairness of spectrum allocation compared to MIS and Greedy algorithm.

Key word：
cognitive radio network

spectrum allocation

maximal independent set

benefit matrix

integrated allocation weight

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Research on resource allocation for enhancing access rate in dense D2D networks

DOI：10.16157/j.issn.0258-7998.2017.03.024

Author：Yu Xiang，Zhang Haibo，Ke Wentao

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

Abstract：Introducing the D2D communication into cellular network can increase the system throughput, improve the utilization of resources and reduce the power consumption of the terminal. Traditional resource allocation algorithm only solve the problem of resource allocation in sparse D2D network. How to use the limited spectrum resources to access the all devices into network is an urgent problem to be solved. This paper presents a high access rate of the resource allocation algorithm, selecting the optimal D2D link access to meet the access conditions for each channel in the cell under the control of the base station. The simulation results show that the proposed algorithm can effectively increase the access rate of the D2D link in the hybrid network, and effectively increase the multiplexing gain of each cellular channel.

Key word：
terminal through

resource allocation

dense D2D cellular network

load balancing

access rate

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Popularity and betweenness based caching scheme in CCN

DOI：10.16157/j.issn.0258-7998.2017.03.025

Author：Xu Changbiao，Wang Hua

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

Abstract：With the increasing of networking traffic, the current IP network could not satisfy the requirement of users. CCN becomes a hot research in future networking, its notable feature is caching everywhere. It is important to design an efficient caching mechanism. For helping relieve some existing problem in caching mechanism, a popularity and betweenness based caching scheme is put forward. While the number of requests meet the income standard, matching content popularity and importance of node, finally, the caching nodes is found. The simulation results show that the node hit rate is increased and the average hops of obtaining content is cut down.

Key word：
caching

content profit

content popularity

importance of node

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Improved frequency synchronization method for OFDM systems based on training sequence

DOI：10.16157/j.issn.0258-7998.2017.03.026

Author：Wang Sibo，Ma Shexiang，Meng Xin，Wang Junfeng

Author Affilications：School of Computer and Communication Engineering，Tianjin University of Technology，Tianjin 300384，China

Abstract：In this paper, a new training sequence is designed and an improved frequency synchronization method is proposed for OFDM systems, aim to overcome the low synchronization precision and the small estimation range. The proposed method is based on training sequence to estimate, and the corresponding carrier frequency offset(CFO) estimation function is presented. After accurate timing synchronization, the fractional frequency offset(FFO) can be obtained by using the new metric function, according to the conjugate characteristic of the training sequence structure in the time domain. And the integer frequency offset(IFO) can be estimated by the cyclic shift of the training sequence of the received signal in the frequency domain. Theoretical analysis and simulation results show that the mean square error(MSE) of the frequency offset estimation is relatively low, and the range of fractional frequency offset estimation is expanded, the correct detection probability of the integer frequency offset is higher than other methods.

Key word：
OFDM

frequency synchronization

training sequence

MSE

correct detection probability

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The research on reliability optimization in SDN controller placement

DOI：10.16157/j.issn.0258-7998.2017.03.027

Author：Mao Ming，Chen Shuqiao，Cui Shijian

Author Affilications：National Digital Switching System Engineering ＆ Technology Research Center，Zhengzhou 450002，China

Abstract：The Software Defined Networking(SDN) approach decoupled control and forwarding planes in the traditional network architecture. It connected all the forwarding devices to a logically centralized controller. To avoid single failure introduced by the expansion of network scale, distributed control architecture was going to be a new tendency in the deployment of OpenFlow WANs. The controller placement problem was one of the critical problems in SDN design. This paper proposed a controller placement scheme based on the connectivity of control path to maximize the reliability of controller placement in SDN, and used three different algorithms to contrast the performance. Simulation results show the scheme can enhance the reliability of SDN controller deployment within delay constraint.

Key word：
SDN

controller placement problem

reliability optimization

control path

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Computer Technology and Its Applications

Ultrasound image segmentation algorithm for thyroid nodules

DOI：10.16157/j.issn.0258-7998.2017.03.028

Author：Wang Xin，Li Liang

Author Affilications：College of Computer Science and Engineering，Changchun University of Technology，Changchun 130012，China

Abstract：As ultrasound images have the characteristics of large noise, low contrast and uneven gray, the segmentation algorithm combing improved local image fitting(LIF) model and Chan Vese(CV) model is proposed in this paper. The traditional LIF model is easy to fall into local minimum during evolution process. In order to avoid the local optimal problem during evolution, this paper introduces global gradient energy information. Combining the advantages of global segmentation of CV model that it is not sensitive to the initial position，the proposed model can not only segment the images with non-uniform gray distribution, but also weaken the sensitivity of the active contour to the initial position. Experimental results show that the proposed algorithm can overcome the influence of noise and realize the segmentation of the uneven gray images.

Key word：
thyroid nodules

image segmentation

local image fitting model

Chan Vese model

level set

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Research on the implementation of topology mapping algorithm in intelligent Cloud test

DOI：10.16157/j.issn.0258-7998.2017.03.029

Author：Wang Liang1，Han Liangan2，Xie Xihai1

Author Affilications：1.School of Communication and Information Engineering，Xi′an University of Posts and Telecommunications，Xi′an 710061，China； 2.Xi′an Aerospace Power Technology Research Institute，Xi′an 710025，China

Abstract：In order to strengthen the centralized management of testing resources and combined with the actual ATF topological mapping, there have been a number of methods for realizing automatic topological mapping of intelligent Cloud test platform which based on features of intelligent Cloud test platform. The method is based on ATF framework, which has been analyzed the logical structure of the core algorithm of automatic topology mapping in detail, so that we can optimize the size of the solution space of the candidate device and the connection mapping of each candidate device constantly. The carry table and the sorting of logical device are used to abtain the sorting methods for device groups. And there is no doult contributing to get the new methods for automatic topology mapping. The extension and confidentiality of topology mapping algorithm are verified in the actual intelligent Cloud test environment. Not only that, the efficiency of discovery, accuracy and effectiveness has been greatly improved.

Key word：
intelligent Cloud test

ATF

topological mapping

carry table

View(6112)

Design and implementation of Hadoop based storage and management platform on the Weibo public opinion

DOI：10.16157/j.issn.0258-7998.2017.03.030

Author：Yu Hui1，Huang Yongfeng2，Hu Ping3

Author Affilications：1.University of Chinese Academy of Sciences，Beijing 100043，China； 2.Department of Electronic Engineer，Tsinghua University，Beijing 100084，China； 3.Institute for Science and Network Space Sciences，Tsinghua University，Beijing 100084，China

Abstract：Along with the rapid development of Internet technology continuously, the network public opinion monitor system has been widely used. The amount data of Network public opinion monitoring system has been rapidly expanding, resulting in how to efficiently store and manage the vast amounts of unstructured or semi-structured data become challenge subject in network public opinion system research and development. Traditional relational database and distributed computing and data processing have been becoming more and more not suitable to the increasing network data. This paper establishs a multi-layer architecture based on Hadoop storage platform of Weibo public opinion application according to the characteristics of Weibo data, and uses column database to design a variety of the table structure of Weibo structured data, and the model of the relationships between tables. Test result shows that the designed storage management platform has the charactistics of the rapid reaction rate of retrieve and good scalability, etc.

Key word：
opinion analysis

Hadoop

Hbase

cloud storage

cloud computing

View(9118)

“Internet +” intelligent access control system

DOI：10.16157/j.issn.0258-7998.2017.03.031

Author：Zhu Hangjiang，Pan Zhenfu，Zhu Yongli

Author Affilications：School of Control and Computer Engineering，North China Electric Power University，Baoding 071000，China

Abstract：The system embedded into the Android Service components could automatically implement the link between Bluetooth 4.0(Bluetooth Low Electric，BLE) and Android smart-phones background programs. And on this basis，it designed with multiple intelligent control lock functions including voice controller to unlock function, shake to unlock function, and proximity sensor unlock function based on iBeacon. Especially, proximity sensor unlock automatically authenticated the user information instead of operating manually, and realized controlling to intelligent access control system. And the system made use of WiFi technology and completed the communication among the mobile phone, the door controller and the server, which made it possible to feedback system status real time and improve indoor security through users checking information by the phone. Finally, the results of experiments show the system is intelligent, convenient and security. In consequence, the system has wide range of application in intelligent home areas.

Key word：
intelligent access control system

STM32 microcontroller

intelligent control lock

Bluetooth

WiFi

View(13970)

Power Supply Technology and Its Application

The analysis of proportional complex integral control based on allpass filter

DOI：10.16157/j.issn.0258-7998.2017.03.032

Author：Li Fansen1，Cao Taiqiang1，2，Chen Xiandong1，Xia Yucheng3，Lin Yuting1

Author Affilications：1.Schoole of Electric Information，Xihua University，Chengdu 610039，China； 2.Key Laboratory of Fluid and Power Machinery(Xihua University)，Ministry of Education，Chengdu 610039，China； 3.UOG-UESTC Joint School，Chengdu 611731，China

Abstract：The traditional proportional integral control single-phase grid connected inverter has the problem of steady-state amplitude and phase error, and the harmonic component is larger. Based on this, the injection characteristics of proportional complex integral(PCI) control method with zero steady-state error and low harmonic, complex link is realized by all pass filter, in the single-phase grid connected inverter system, no need of constructing virtual three-phase coordinate and dq coordinate system, which simplifies the structure of control system. With Simulink under the same conditions of PI and PCI control simulation analysis, the PI control of single-phase inverter output current thd value is 0.83%, and PCI control thd value is 0.46%, if we add multiple PCI control can be reduced to 0.25%. Therefore, the simulation results show that the single-phase grid connected inverter with PCI control has good steady-state performance and the suppression of the grid connected current harmonics.

Key word：
singel-phase

proportional complex integral control

allpass filter

zero steady-state error

harmonic suppression

View(9756)

Simulation and design of coil′s parameter in wireless charge system for EV

DOI：10.16157/j.issn.0258-7998.2017.03.033

Author：Zhang Xin，Jia Erju，Fan Xingming

Author Affilications：Department of Electrical Engineering & Automation，Guilin University of Electronic and Technology，Guilin 541004，China

Abstract：Magnetically－coupled resonant wireless power transmission(MCR－WPT) technology has the advantage of mid-range, high-power and high efficiency, which makes it more suitable for electric vehicle(EV) wireless charge. The coil works as a core in this technology, whose proper parameters′ design could effectively enhance output power and transmission efficiency. Firstly, the operation principle of MCR-WPT is introduced and theoretical model is built based on equivalent circuit theory. Subsequently，the application of this technology in EV is described．Based on theoretical analysis, the relationships between coil′s parameters and transmission properties are investigated through MATLAB．We can extract a conclusion that there are optimal turns and average radius which make the output power and efficiency maximal. Besides the coil′s parameters adjusted to EV′ wireless charge are devised．The designed system could achieve that the power is 1.60 kilowatt and the efficiency is 96 percent approximately when the transmission distance is 0.3 meter． Then the feasibility of designed parameters are verified with the help of Pspice．

Key word：
electric vehicle(EV)

magnetically-coupled resonant(MCR)

wireless power transmission(WPT)

equivalent circuit theory

parameters′ design

View(16664)

A novel method of dynamic power management for supporting external device control

DOI：10.16157/j.issn.0258-7998.2017.03.034

Author：Song Yunlei1，Liu Xinghui1，Yan Bin2，Jin Chuan′en2

Author Affilications：1.College of Physics，Liaoning University，Shenyang 110036，China；2.Silicon Ark Technology Co.Ltd，Hefei 230088，China

Abstract：In order to reduce the power consumption of a MCU system, and to save the hardware resources, a novel method of dynamic power management is proposed. The dynamic power management method supports not only the software but also the external device to manage the power domain of the MCU system; according to the actual application scenario, the external device can power on or off the power domain of the MCU system through the communication circuit in real time; the communication IO port of the communication circuit is reused with the external wake-up IO port. Experimental results show that, compared with the traditional method of clock gating, the method of dynamic power management has a significant effect on reducing the static power consumption of a general MCU driving motor: during the pulse width modulation(PWM) module in stable operation and standby state, the total static power consumption of the MCU system is reduced by 27.43% and 98.18% respectively. The dynamic power management effectively reduces the power consumption of MCU, saves the hardware resources, and improves the flexibility and efficiency of the control of power domain in MCU.

Key word：
internal power domain control

IO port reused

dynamic power management

low power MCU

View(6084)

Design of AC and DC superposition power supply

DOI：10.16157/j.issn.0258-7998.2017.03.035

Author：Wang Shengli，Wu Yunfeng，Tang Hui，Hu Boyang，Miao Ling

Author Affilications：School of Energy Science and Engineering，University of Electronic Science and Technology of China，Chengdu 611731，China

Abstract：It is proposed to design a good dynamic response and adjustable frequency AC and DC superposition power supply, in order to prepare metal oxide nanoparticles with electrochemical corrosion method. The maximum peak voltage output of the power supply is 30 V, the maximum current allowed to flow through is 10 A, and square wave frequency is 35-101 Hz. The circuit of power supply includes an auxiliary power supply circuit, a square wave generating circuit and the DC superposition circuit. In this paper, the author designs the main circuit topology, analyzes the circuit principle, elaborates its frequency control method and produces the results of voltage and frequency modulation. This power supply is applied to electrodeposition and electrochemical corrosion test which achieved effective results and obtained the size of 30 nm of Fe3O4 particles. It is proved that the power supply is possessed of the merits of fast dynamic response, adjustable frequency and high stability in electrochemical corrosion experiment of metal oxide nanoparticles preparation.

Key word：
AC and DC superposition power supply

metal oxide

nanoparticles

symmetrical square wave

electrochemical corrosion test

View(13356)

Improvement research of SPLL in ip-iq method based on instantaneous reactive power theory

DOI：10.16157/j.issn.0258-7998.2017.03.036

Author：Gao Wenhua1，Zhou Juan2，Wang Ziji2

Author Affilications：1.Hot Rolling Operations Department，Shougang Jingtang United Iron&Steel Co.，Ltd，Tangshan 063210，China； 2.School of Information and Electrical Engineering，China University of Minning and Technology，Xuzhou 221116，China

Abstract：Harmonic Current Detection is one of the key link of active power filter. The principal premise of ensuring correct detection of harmonic current is locking the network voltage frequency accurately by using phase-locked loops. The thesis studied in detail the various SPLL theories that applied to the link of harmonic detection and their advantages and disadvantages on the basis of instantaneous reactive power ip-iq harmonic current detecting method, upon which improvement has been made in the aspect of three-phrase software phrase-locked loop of DSC module. Simulation and experimental result suggest that the new pattern of three-phrase SPLL method implements simple, operates fast, and can lock phase information accurately.

2017 No. 03

Publish Date：2017-03-06

ISSN：0258-7998

CN：11-2305/TN

Special Column-Heterogeneous Computing

Key word： multi-core system on chips CMP MPSoC View(19122)

Key word： heterogeneous multi-core motion controller high-speed interface OMAPL138 FPGA View(10886)

Key word： FFT convolution overlap-add algorithm mapping task parallelism heterogeneous multicore View(15080)

Review and Comment

Key word： electric power monitoring system communication security trusted network connection industrial communication whitelisting View(22054)

Microelectronic Technology

Key word： LED driver high-voltage regulating circuit linear regulator low-voltage power supply BCD process View(9548)

Key word： AXI Bus multi-processor SoC crosspiont-queued multi-layer Bus View(11948)

Key word： equivalent circuit RF small signal noise parameter parameter extraction View(14308)

Key word： network-on-chip router FIFO fault-tolerant View(8206)

Key word： interconnected system IGBT module MATLAB/Simulink ANSYS temperature field distribution View(8422)

Key word： NCO CORDIC algorithm precision pipeline View(10764)

Embedded Technology

Key word： FPGA in-system program JTAG View(17326)

Key word： self-restorable fast RMS algorithm over & under voltage protection circuit break protector View(8246)

Key word： wireless sensor network design of development platform KW01-ZigBee component design engineering framework View(14538)

Key word： frequency searching frequency tracking wide-band ultrasonic power supply View(12374)

Key word： wearable device online upgrade BIOS embedded Flash View(7208)

Measurement Control Technology and Instruments

Key word： EtherCAT slave station IO expansion SPI SYS/BIOS View(25832)

Key word： Kinect robot motion recognition algorithm APP View(10688)

Key word： CC2541 Bluetooth Android temperature measurement View(11608)

Key word： indoor positioning WiFi Android platform fingerprint algorithm improved algorithm View(17958)

Key word： air purifiers STM32 control system View(18766)

Key word： intelligent shoe Internet of Things STM32 cloud server client View(27870)

Key word： distribution network equipment RFID temperature online monitoring View(8226)