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October 30,2014
Volume 7,Issue 20
Pages -
Subject Area:Image Processing,Communications Technology,Communication Network Technology,Electronic Technology

Title: A novel control algorithm for dynamic quantitative weighing system

Authors: GAO Junfeng, DONG Huaiguo
PP: 2092-2097
Abstract: There is a contradiction problem between weighing accuracy and weighing speed of dynamic quantitative weighing system. For this problem, based on incremental automatic gravimetric filling weighing system, a mathematical model was constructed with Moore finite state machine. In order to accurately control the state migration, a dynamic adaptive state prediction control (ASPC) algorithm was proposed. The mathematics analysis showed that the measured value, current state and predicted value were the mainly factors of state migration. The ASPC algorithm was compared with other prediction algorithms through quantiative weighing experiment. The results indicated that ASPC algorithm was an effective way to coordinate the conflicts of weighing accuracy and weighing speed to some extent, and the weighing range was expanded.
Keywords: other subject of automatic control technology; dynamic weigh; quantitative weigh; dynamic measurement; control algorithm

Title: Application research on split augmented Lagrangian shrinkage algorithm in magnetic resonance imaging based on compressed sensing

Authors: ZHENG Qingbin, DONG Enqing, YANG Pei, LIU Wei
PP: 2082-2091
Abstract: In order to meet the demand of reducing scan time of magnetic resonance imaging (MRI), accelerating MRI and reconstructing a high quality image from less acquisition data is as much as possible. MRI method based on compressed sensing (CS) with multiple regularizations (two regularizations including total variation norm and L1 norm or three regularizations consist of total variation, L1 norm and wavelet tree structure) is proposed in this paper, which is implemented by applying split augmented Lagrangian shrinkage algorithm (SALSA). To solve magnetic resonance image reconstruction problems with linear combinations of total variation and L1 norm, we utilize composite split denoising (CSD) to split the original complex problem into total variation (TV) norm and L1 norm regularization subproblems which are simple and easy to be solved respectively in this paper. The reconstructed image is obtained from the weighted average of solutions from two subproblems in an iterative framework. Because each of the splitted subproblems can be regarded as MRI model based on CS with single regularization, and for solving the kind of model, split augmented Lagrangian shrinkage algorithm has advantage over existing fast algorithm such as fast iterative shrinkage thresholding (FIST) and two step iterative shrinkage thresholding (TwIST) in convergence speed. Therefore, we propose to adopt SALSA to solve the subproblems. Moreover, in order to solve magnetic resonance image reconstruction problems with linear combinations of total variation, L1 norm and wavelet tree structure, we can split the original problem into three subproblems in the same manner, which can be processed by existing iteration scheme. A great deal of experimental results shows that the proposed CSMRI methods can effectively reconstruct the original image. Compared with existing algorithms such as compressed MRI reconstruction based on total variation (TVCMRI), reconstruction from partial Fourier data (RecPF), composite splitting algorithms (CSA), fast composite splitting algorithms (FCSA) and wavelet tree sparsity MRI (WaTMRI), the proposed methods have greatly improved the quality of the reconstructed image and have better visual effects.
Keywords: image processing; magnetic resonance imaging; compressed sensing; split augmented Lagrangian; total variation norm; L1 norm

Title: Lane line detection application based on improved Hough transform and FPGA

Authors: GAO Zhenbin, ZHAO Pan
PP: 2075-2081
Abstract: The lane line detection has been implemented based on improved Hough transform on field programmable gate array (FPGA) platform. The detailed algorithm is confirmed through simulation on Matlab. During the FPGA realization, the parts below are included: the image collection, the pretreatment of median filtering and region of interest (ROI) selection of the intake image, the Sobel edge detection, the detection of the lane lines through the improved Hough transform, the results output. The IP cores such as RAM and multiplier are used to make better use of the resources in FPGA. And the limited area ROI and the method of hierarchical assembly line is put forward in order to improve the real-time detection. Experimental data fully shows that the lane line detection algorithm has good robustness and real-time performance.
Keywords: image processing; field programmable gate array; region of interest; Hough transform; Sobel edge detection; lane line

Title: Application of extended Kalman filter to gripper force measurement system

Authors: QIU Jing, WANG Niu
PP: 2068-2074
Abstract: Against the problem of strong interference in gripper force measurement, a method of extended Kalman filter (EKF) based on nonlinear model of the whole closed-loop force control system was proposed. The extended Kalman filter was designed based on gripper piecewise nonlinear state-space model. In simulation and actual system experiments, the extended Kalman filter was applied and compared with Butterworth low-pass filter and mixed filter based on digital signal processor (DSP). The results demonstrated that the proposed method was effective, and the estimation of gripper force measurement could meet the requirements of closed-loop control.
Keywords: information processing technology; extended Kalman filter; gripper system; force measurement

Title: Design of stable light source with adjustable output power based on the laser

Authors: ZHONG Tiegang, SHI Wei, WANG Kun
PP: 2062-2067
Abstract: In this paper, a new semiconductor laser driving power with slow-start function and low ripple based on laser driver chip iC-WKN is designed. In order to reduce the influence of temperature change, a temperature control device is designed to make laser work under a stable temperature. Then, a signal regulation circuit which consists of D/A converter and single chip microcomputer is designed to achieve the regulation and control to laser output power. The stable light source has many characterastics including high stability temperature, laser outpat power contiunous reguliton and low costs.
Keywords: semiconductor technology; semiconductor laser; stable light source; driving power; temperature control device

Title: A spiral antenna with integrated parallel-plane feeding structure

Authors: HUANG Huifen, LÜ Zonglin
PP: 2058-2061
Abstract: The vertical Balun always has a significantly long length, inconsistent with the requirements of the low profile spiral antenna geometry. A spiral antenna with integrated parallel-plane feeding structure is proposed in this paper. The antenna used has smaller size and obviously improved axial ratio compared to the equiangular spiral antenna at low frequencies. And the traditional Balun in the third dimension is moved to the planar plane. The antenna and the Dyson-style Balun have been integrated into a multi-layer structure. The resulting structure maintains the typical radiation behavior and the broadband operation of the spiral antennas, but the vertical Balun is integrated at the same plane with the antenna. The overall size of the spiral antenna is largely reduced.
Keywords: radio propagation; spiral antenna; parallel-plane feeding; ultra-wideband

Title: Queuing-based performance analysis for opportunistic spectrum access of the secondary users in cognitive radio networks

Authors: ZHANG Lei, HU Jing, WU Ming, SUN Dafei, SONG Tiecheng
PP: 2052-2057
Abstract: In cognitive radio networks, analyzing the waiting time before opportunistically accessing to the idle spectrum of primary users can help to improve the spectrum access probability for the secondary users, and thus, improve the spectrum efficiency. Accordingly, this paper proposes a Markov queuing model by considering the activity of both primary and secondary users in the cognitive radio network, and obtains the average waiting time of the secondary user in the steady state before access to the spectrum through the matrix-geometric solution theory. The final number results not only confirm the rationality of the analysis but also provide a reference to meet the secondary user’s waiting delay before using the spectrum for the system.
Keywords: wireless communication technology; cognitive radio network; queuing theory; performance analysis; opportunistic spectrum access

Title: Undefended relay access algorithm of WSN under standard deterministic deployment

Authors: DENG Changjian
PP: 2043-2051
Abstract: In order to solve the problem of node deployment of wireless sensor networks (WSN) for equipment condition online monitoring system in power plants having large arbitrariness, evaluating indicators such as valid total power consume, active communication overlap, valid life circle of networks and so on were approved. Then the WSN of hierarchy MESH network of standard deterministic deployment was constructed under the constraint of valid power consumes and communication overlap. Based on this deployment, the random access algorithm under the transparent mode of independence relay nodes based on information routing was designed, and ultra low power consume multi hop communication under industrial standard deterministic deployment was realized. Experiments showed that when number of hops was increased, the network could work normally, and mean current consume could be decreased (some devices were decreased more than 100%), and it was easy to construct standard large scale monitoring network.
Keywords: communication network technology; relay nod; low power consume; hierarchy MESH; standard deterministic deployment; random access

Title: Low-complexity side information generation algorithm in distributed video coding system

Authors: YUE Hong, LIU Xiaojuan, QING Linbo, HE Xiaohai
PP: 2036-2042
Abstract: In order to reduce the complexity of the side information generation, this paper proposes a structure tensor-based side information generation algorithm. The proposed algorithm can obtain the levels of movement in disparity block by computing the structure tensor, then the video frames are divided into background, slow movement and severe movement regions according to the levels of movement. Finally, different search ranges are set up for the three different regions to generate side information, respectively. Simulation results show that the complexity can be reduced about 55%~97% by using the proposed algorithm, while the quality decreasing of side information is neglectable.
Keywords: communication technology; distributed video coding; side information; structure tensor; motion compensated temporal interpolation

Title: Research of indoor localization algorithm based on RFID and RSSI

Authors: GAO Yongqing, SHANG Dan
PP: 2029-2035
Abstract: Firstly, the advantages of radio frequency identification device (RFID) technology used in indoor localization is analyzed in this paper. Then one method of obtaining reference tag fingerprint information by use of average filter is proposed, one improved algorithm which uses the log distance model of path loss for interpolation to compute the received signal strength values of virtual reference tags is proposed according to the classic LANDMARC algorithm and VIRE algorithm, so that the localization accuracy is further improved. The experimental results show that the localization algorithm can significantly improve the localization accuracy.
Keywords: communication technology; radio frequency identification; received signal strength indicator; indoor localization; algorithm; reference tags

Title: Application of DAC3484 in distributed base station

Authors: MENG Lin
PP: 2014-2028
Abstract: High speed digital to analog convertor (DAC) is an important component in wireless telecom base station. Its character better or worse is critical to transmitter bandwith and spurious free dynamic range (SFDR) performance. This paper introduced a high speed DAC product DAC3484 of TI company, discussed some application key points such as part selection, schematic link budget, circuit design and configuration for relative designer reference.
Keywords: electronic technology; wireless communication technology; distributed base station; high speed digital to analog convertor

Title: Design of photovoltaic system data collection terminal based on ARM9

Authors: XU Shengyang, WANG Jiehuan
PP: 2007-2013
Abstract: China mainly relies on foreign data collection terminal and the monitoring software. In this paper, a photovoltaic system data collection terminal was designed, which is based on ARM9 core, compatible with a variety of photovoltaic inverter and junction box, also can realize real-time transferring and monitoring data. This work has a positive effect on intellectual property rights of China photovoltaic industry.
Keywords: electronic technology; data acquisition; photovoltaic system; ARM9

Title: Effect of optimization of emission layer on the performance of organic light-emitting diodes

Authors: XU Wei, WANG Li, WANG Qiang, LIU Lipu, MENG Huan, TONG Yexiang
PP: 2003-2006
Abstract: In this paper, luminous efficiency of organic light-emitting diodes has been enhanced by the optimization of the emission layer (EML). By optimizing the thickness of EML, we achieved a current efficiency of 6.53 cd/A (Device 2) at a current density of 20 mA/cm2, Which is 40% higher compared with Device 1 and 23% higher compared with Device 3. This improvement in the device efficiency has been attributed to the optimization of the EML which leads to the effective carrier balance in the emission zone.
Keywords: electronic technology; organic light-emitting diodes; optimization; current efficiency; thickness

Title: Design and fabrication of an absolutely flexible pressure sensor array

Authors: MEI Haixia, WANG Rui, FENG Jianchao, ZHANG Ce, WANG Zhixuan, HOU Bingji, ZHANG Tong
PP: 1999-2002
Abstract: An absolutely flexible pressure sensor array based on flexible substrate and flexible pressure-sensitive materials is designed. The 4 flexible sensors array is prepared by lithography process, the size is 2.5 cm .5 cm, the flexible substrate is PET/ITO (polyethylene terephthalate/indium Tin oxides), and the pressure-sensitive material is conductive rubber (CSA57-7RSC PCR Technical). Experiments show that the absolutely flexible pressure sensor array presents negative pressure resistance effect under a loading from 0 to 10 N. It has high sensitivity and fast response features. The perceived size and azimuth of the external forces on the sensor array can be easily recognized. The micro array can be used for bionic robot hand.
Keywords: sensitive electronics; absolutely flexible; pressure sensor; array

Title: Design and implementation of noise suppression module used for mutual capacitance touch control integrated circuit

Authors: REN Xulei, SHENG Weiguang, ZHANG Diansheng
PP: 1992-1998
Abstract: This paper introduced the principle of mutual capacitance touch screen and touch control integrated circuit, then made a design and implementation of noise suppression module which is embedded in the touch control integrated circuit. This module could increase the touch control integrated circuit’s noise suppression ability, and further increased the mutual capacitance touch screen’s signal to noise ratio.
Keywords: microelectronics; integrated circuit design; mutual capacitance touch screen; touch control integrated circuit; signal to noise ratio

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