bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on a Novel Solar Charging System
Authors: Wen Chang Bao , Fu Ying Fei , Gao Li Hong , Li Yan Ming , Ju Yong Feng
Published: September 2014

To solve the wide range of the output voltage, difficult storage and not unified interface of solar cell, a novel solar charging system was proposed. The system consists of the solar panel, the voltage regulator circuit, the battery charge management circuit, the lithium battery, the booster circuit and the USB output circuit. The voltage regulator circuit can convert the output voltage of solar panel into 5V. By means of the charge management circuit, the energy is stored in the lithium battery, and it can be provided to the load via the booster circuit and USB interface, which can achieve the goal of the conversion, storage and utilization from solar to electrical energy. Under the condition of effective illumination between 10:00 and 16:00, the solar charging system was tested for 7 days. Experimental results show that the output voltage always maintained at 5V during the test. The output voltage of lithium battery reaches to 4.2V after four hours, and the output voltage of USB port always stabilizes at about 5V.
Research on Assessment of Coordinated Evaluation in Electricity Ecosystem Based on Entropy Weight and AHP
Authors: Qin Li Juan , Sun Zhi Yuan , Liu Lu , He Yi
Published: September 2014

In coordinated evaluation of electricity ecosystem, it’s should not simply on the basis of the value of information transmitted by index, but also make a comprehensive analysis of knowledge and experience of experts and policymakers. In this paper, the actual situation of Guangxi power grid as an example, the electricity ecosystem coordinated development optimization based on the constraints of resources and environment is carried out. And explore the relationship among the electric power industry, regional environment and economy. The comprehensive evaluation method based on entropy weight and AHP is suggested, which solves the casualness and subjectivity problem about weight decision in traditional comprehensive evaluation method, in order to improve the accuracy and credibility of evaluation results, and put forward new ideas for the coordination of protection of Guangxi regional power industry and environment development, in order to achieve the harmonious development among economy, environment, power.
The Simulation Study of New Boost-ZVT Circuit Based on Pspice
Authors: Wu Yue Feng
Published: September 2014

Because the shortcoming of the traditional Boost-ZVT has large shutdown losses for the auxiliary switch on hard-working, the circuit has disadvantage of low efficiency. The paper discusses a new Boost-ZVT circuit, and the new circuit designs the absorption circuit in the auxiliary switch circuit to achieve soft turn-off. Compared to ordinary Boost-ZVT circuit, all the switches work in a state of soft-switching for an improved Boost-ZVT circuit. So the new Boost-ZVT circuit can improve the efficiency of the system, at the same time it can eliminate the interference because of switch temperature rising, and can ensure the reliability of the whole system. Finally, the paper builds circuit model and make simulation based on PSPICE, and the simulation results show that the theoretical analysis is correct.
The Impact of Power System Frequency Regulation Caused by Wind Disturbance
Authors: Liu San Ming , Wang Zhi Jie , Sun Xia , Liang Yi Teng , Zhu Xiao Wei
Published: September 2014

The impacts of wind disturbance on voltage regulation and frequency regulation of power system were studied. The opinion that the regulation of power flow on the tie lines between the grids constrains the integrated capacity of wind power was put forward. Based on the real condition of Inner Mongolia power grid, an engineering practical method was put forward to calculate the integrated capacity of wind power under this constraint. The relationship between wind power and spinning reserve and the impacts of other related factors on the capacity of wind power were studied as well. The impact of wind disturbance on voltage stability where the wind farms are located was studied.
Mixed Chance Constrained Unit Commitment Model for Power System Containing Wind Farm
Authors: Sheng Si Qing , Sun Xiao Xia
Published: September 2014

This paper presents a new unit commitment model to solve the uncertainty of wind and load. The chance constrained programming is introduced in this paper. The uncertainty of wind and load is expressed as their prediction error. Considering their different characteristic, wind prediction error is indicated as a fuzzy variable, while load prediction error is represented as random variable. Different confidences reflect the different satisfaction of the constraints. Finally, example analysis shows that the proposed model is feasible and effectiveness.
Research on Field Parameter Setting Test for Using 10kV Chain SVG to Resolve Low Voltage of Rural Power Grid Substation
Authors: Xing Yun , Du Sheng Jie , Jiao Ming Hang , Liu Shu Ze , Li Gang , Zhang Lin , Wang Yuan Hang , Zheng Nan , Hong Li
Published: September 2014

In recent years, power companies in different provinces have equipped the rural power grid substation with SVG, which has effectively resolved the problems of rural power grid such as low voltage and great fluctuation. Since SVG is a new 3G dynamic reactive compensation technology, people don’t know its compensation feature well. SVG control parameters are not configured according to the operation rules of the rural power grid substation.SVG shall undergo field test before commissioning in order to better resolve the problem of low voltage. Electrical property of the system to be compensated is known through the interaction between SVG and the system, thus determining the actual compensation mode and control parameters of SVG, thus achieving the best compensation effect.
Design of System to Prevent Drunken Driving Based on GPSGSM Technology
Authors: Guo Zhan , Xiao Zu Ming
Published: September 2014

Against drunk driving, this paper puts forward a kind of design scheme of vehicular system to prevent drunk driving based on GPS/GSM technology. The system is at the core of a single chip processor with the use of the alcohol sensor to test the driver's alcohol concentration.alcohol sensor.If alcohol is beyond the limit, cars are banned running and drunk driving information will be sent to the traffic police command monitoring platform through the GPS/GSM technology. The system has the characteristics of integration, human nature, and intelligence.
Flow Induced Vibration in the Seal System
Authors: Zhang Nan
Published: September 2014

The oscillating flow is an important factor affecting the performance of the rotor–seal system. From the point of view of flow induced vibration, the nonlinear models of the rotor-seal system are presented for the analysis of the self-excited vibration, which is induced by interaction between the unstable seal fluid flow and the vibrating rotor. The nonlinear characteristics of flow induced vibration in the rotor-seal system are analyzed, and the nonlinear phenomena in the unbalanced rotor-seal system are investigated using the nonlinear model with the flow induced vibration.
Realization of Interrupts and Time Management of a Sensor Network Operating System
Authors: Li Hai Cheng , Zhou Yan
Published: September 2014

μOS, the operating system of microkernel wireless sensor network, is a real-time multi-tasking operating system; and its main function modules include task management, time management, interrupt management, energy conservation mechanism and communication protocol. Thereinto, its time management and interrupt management is the basis of other functional modules. The author designs and realizes clock management and interrupt management for microkernel wireless sensor network operating system μOS. It is shown from system performance tests such the time management and interrupt management are capable of satisfying real-time requirements in the system.
The System of Face Recognition Design
Authors: Yu Xiao Bin , Li Zi Qiao , Ke Wen Qiang , Li Rui Peng , Xiong Kai
Published: September 2014

The technology of face recognition is the media to face images as the identity of the face recognition system.Through the choice of color space and the establishment of skin color model, give a rough detection for the human's image, then use the face Haar features getting more accurate detection.
Integration Frequency Response of Human Dynamic Anterior-Posterior Balance under Passive Motion Stimulus
Authors: Xiao Jin Zhuang , Xue Rui Jing , Wang Hong Rui
Published: September 2014

In order to study the frequency characteristic of body oscillation in the anterior-posterior (AP) direction during upright stance, 10 subjects were exposed to the motion platform with specific posture and followed the tracks of the passive motion stimulus, sinusoidal waveform, with the increasing frequencies (0.05-1.2Hz). By measuring the displacement of the center of gravity (COG), the bode diagram between the motion of platform and body’s COG was obtained. Results showed that the mean cut-off frequency (COF) is 0.5 Hz, the mean resonance frequency (RF) is 0.316 Hz and the bandwidth of the body oscillation is 0.1-0.5 Hz in AP direction. In a conclusion, this study reaches the frequency response of human dynamic balance under passive motion stimulus by using COG values, proposes a method based on the COF values to evaluate the balance ability, and provides data support for the research of balance ability in the medical community.
Dynamic Analysis of Large-Displacement Motion Simulator
Authors: Zhou Yue Fa , Guo Song Lin , Zhou Wen Bo , Zhang Zhi Yong , Song Tian Shu
Published: September 2014

Inverse dynamics problem of large-displacement motion simulator is solved by Roberson-Wittenburg method. Simulation graphs plotted by matlab prove the validity of solution. This paper can be used in control studies of motion simulator.
3D Fusion Technique Based on Wavelet Transform for 3D Dataset of Gravity and Magnetic Inversion
Authors: Li Yuan Jie , Guo Liang Hui , Zhang Guo Li
Published: September 2014

We presented 3D fusion technique based on wavelet transform for analyzing 3D dataset of gravity and magnetic inversion intuitively and comprehensively. The technique expands the conventional 2D image fusion technique based on wavelet transform to 3D case, including using 3D wavelet decomposition and reconstruction to replace 2D ones and reforming the fusion rules of high and low frequency components in 3D field. The disciplines of some crucial parameters related to the 3D fusion technique were provided, so that bring some convenient to use this techinique. The synthetic data test showed that the 3D fusion technique is effetive and reliable.
Medical Ultrasound Image Denoising Algorithm Based on Nosubsampled Contourlet Transform
Authors: Shen Min Fen , Huang Fei , Su Zhi Fei , Sun Li Sha
Published: September 2014

Currently,the ultrasound image has been widely used in diagnosis and treatment of clinical medicine,the results obtained by the diagnostic accuracy and reliability of the image is directly related to the effects of diagnosis and treatment.Because ultrasound images in the imaging process inevitably contaminated noise,thus the research of inhibiting ultrasound image noise is one of the important issues in domestic and international ultrasound imaging techniques.This paper studies the multi-scale analysis and wavelet thresholding two theories,put forwarda denoising algorithm about combining the Nonsubsampling contourlet transform and a new threshold function,experiments show that the new algorithm can not only good at suppressing the noise of ultrasound images,and can better retain image edge and texture details.
Image Threshold Segmentation Algorithm Based on Histogram Statistical Property
Authors: Li Hong , Lai Zhong An , Lei Jun Wei
Published: September 2014

The traditional Otsu threshold algorithm is not a good method for processing the real images because of complex shape and unbalanced distribution. To solve this problem, the paper uses the thinking of Otsu’s method for reference, introduces a threshold segmentation algorithm based on histogram statistical property. In addition, the paper draws a comparison between the new algorithm and Otsu’s algorithm. Experimental results show that the new algorithm can get better segmentation effect than that of Otsu’s method when the gray-level distribution of the background follows normal distribution approximatively, and the target region is less than the background region.
Research of Error Rate in AMI Code
Authors: Li Yong Jun
Published: September 2014

In this paper, the error rate of the AMI code is computed and analyzed based on AMI transfer system model, and the simulate model of the AMI transfer system is constructed based on the SIMULINK. Using the simulate model, we test the error rate of the AMI code, and discuss the relation between the property of the AMI transfer system and Eye Diagram.
A North Finder Scheme for FOG SINS Based on Kalman Filtering
Authors: Zheng Wei Zhen , Yang Gong Liu , Zhang Kui , Ma Ren Dong
Published: September 2014

In the background of using SINS technology to the car north finder, how to use FOG SINS in-vehicle vibration environment to obtain accurate initial attitude information is analyzed. Based on two-point north finder algorithm, north finder algorithm and kalman filtering algorithm are combined, and the north finder scheme for FOG SINS based on kalman filtering is studied. Simulation results show that, the scheme can accelerate the estimation of gyro bias and accelerometer bias, and effectively filter out short-term disturbances. This scheme can obtain accurate high-precision attitude information in the disturbance environment.
Impact of the Unbalanced Magnetic Pull on the Shafting Vibration of Hydro Turbine Generating Sets
Authors: Zeng Yan Yan , Zeng Yun , Wu Zhe , Yu Shi Ge
Published: September 2014

The unbalanced magnetic pull (UMP) of hydro turbine generating sets (HTGS) is one of the main reason induced vibration of the HTGS and the power plant. To study the effects of UMP on the shaft vibration characteristics of HTGS, this article constructs whole HTGS system which include hydraulic turbine and its hydraulic system, generator, transient model of the HTGS shafting, excitation and governing system, to simulate the actual operation of HTGS. The shafting vibration is simulated under different characteristics of UMP, simulation shows that the frequency resonance zone of the UMP has large influence on the shafting vibration. And then, the improved Prony algorithm is applied to extract the shafting oscillation characteristics of HTGS, and is effective. It provides a good method to research the effect of frequency and amplitude changes of UMP on the shafting vibration.
Application of Independent Component Analysis in Structural Condition Identification
Authors: Yan Yang , Li Sheng , Jin Xiao Long
Published: September 2014

One kind of structure condition identification method based on Independent Component Analysis (ICA) is proposed in this paper. The change of structure condition is identified by the feature index extracted from structure vibration signals. It is effectual to identify the structure condition by transforming the test signals into the statistic characteristic space. The correlation coefficient is introduced to measure the correlative degree between the statistical characteristic of two structure conditions and the damage characteristic extraction index based on ICA is constructed. Considering the structure actual situation, assume the undamaged condition or small damaged condition as the benchmark condition. The analysis of structure vibration experiment indicate that the ICA characteristic index can identify the difference between damaged and benchmark condition and this method of ICA is practicable.
A New SLNR-Based Precoding for Multiuser MIMO Downlinks
Authors: Li Xin Min
Published: September 2014

A new SLNR-based precoding is proposed for multiuser MIMO downlinks, which pursues the goal that minimizes total transmit power under each user’s SLNR constraint. The goal problems can be successfully solved by using semidefinite relaxation (SDR) techniques, and power constraint condition added in goal problems can efficiently reduce total transmit power of the base station. Simulation results show that our proposed scheme is almost feasible for users with one antenna, and it has better bit error rate (BER) and lower total transmit power than the maximal-SLNR based precoding method, when it satisfies large SLNR thretholds.
SRR-Based High Gain Microstrip Antenna with Low Radar Cross Section
Authors: Wang Shu Juan
Published: September 2014

The split ring resonators (SRR) is designed to work at X band and its equivalent medium parameters are estimated by using the equivalent analysis method. The high gain microstrip antenna, which is based on Photonic BandGap (PBG) structure, is also studied. To make the scattering wave deviates mirror direction and reduce the out-band Radar Cross Section (RCS) without affecting the performance of antenna, the designed SRR is used as the cover of PBG structure microstrip antenna. The results show that the forward gain of PBG structure antenna is 0.8 dB higher than the tradition antenna. After the SRR covers on the PBG structure antenna, the gain of antenna is unchanged and the RCS of the mirror direction decreases for all incident angles, and the most decrement is 21.05 dB.
Two-Dimensional Reconstruction of Digital Human Images Based on Distributed Parallel Computing
Authors: Ran Xu , Zhong Ming , Cheng Fang , Qiao Liang , Zhou Jun
Published: September 2014

Under the different client scales, distributed parallel computing were employed in the two-dimensional reconstruction for digital human images. Through this way, the speed ratio for reconstruction could be greatly improved but the serial processing and communication overhead restricted the further parallelize scale.
Acquisition and Recovery of Full-Waveform LIDAR Data Based on Compressive Sensing
Authors: Zhao Jun , Lv Jun
Published: September 2014

The full-waveform technology in the small footprint airborne LIDAR systems has enabled us to sample and record the whole returned waveform of a laser shot. Under most conditions the full-waveform signals satisfy the K-sparse condition and thus can be sampled and recovered using the theory of compressive sensing. This paper proposes a new compressive-sensing-based data acquisition and processing method, by which the returned signals are sampled in small number by a Toeplitz-like matrix, and the target cross sections and the full-waveforms are approximated and recovered by GPRS algorithm. The feasibility of this method is verified by simulated experiments under both ideal conditions and non-ideal conditions with noises. The advantage of this method lies in that requirement for the slew rate of the ADC is lowered, which is convenient for the data storage and transmission .
The Performance Development of the Mechanical Suspensions Test Rig
Authors: Liu Yan
Published: September 2014

Mechanical suspension test rig is much cheaper, but is can not meet the requirements of the suspension in-depth study. The reason is that the frequency and amplitude of the bench is immutable. According to the requirements of practical use, the frequency and amplitude control equipment is designed to arbitrarily change the vibration frequencies of the left and right wheels,and it can change the vibration amplitude of the wheels with a range of 5~12mm. It can meet the suspension test requirements.
The Athletes’ Irrational Posture Recognition Based on Minimizing Image Sequences
Authors: Ge Jian , Jiang Liang
Published: September 2014

The paper proposes a kind of athletes’ irrational postures recognition technology based on minimizing image sequences by analyzing the shape bases of the collected images and estimating the overall movement parameters in the single-frame movement images. The irrational movement features information will be projected in the gray fields to obtain the embedded hidden information in the overall movement posture images to achieve the recognition of irrational postures. The experimental results illustrate the posture correction offsets by the proposed improved algorithm are smaller than those in traditional methods with high correction accuracy and the signal to noise ratios of the peaks are increased. The results show the superiority of the algorithm which can be well applied in the motion image fusion and identification areas.
Presenting Color Additive Theory on Image’s Channels Dynamically
Authors: Zhu Yuan Yuan , Yang Wen Jie , Li Lei , Sun Xiao Kang
Published: September 2014

Utilizing visual characteristics of human eyes, color additive theory can make richer colors from red (R), green (G) and blue (B), the three primary colors. Our people live in a colorful world, and color exists everywhere. Many experiments has proved that the three colors can be mixed together to get various colors. In the paper, color additive theory on RGB is shown in a fun, novel manner by user-friendly dynamic process under Microsoft Visual C++ programming environment, whose purpose is to intuitively present the effect of different color overlapping to the viewers. Following the steps of reading image’s data, displaying the pixels, generating color bitmap and showing the dynamical movement of images in single channel, the program displays the mixing process of any two of red, green, and blue colors to get brighter colors, which are called yellow, cyan and magenta and an equal combination of the three colors can get white color.
Research on Action Recognition of Human Body Based on Kinect Sensor
Authors: Guo Dan Dan , Zhu Xi’an
Published: September 2014

An effective Human action recognition method based on the human skeletal information which is extracted by Kinect depth sensor is proposed in this paper. Skeleton’s 3D space coordinates and the angles between nodes of human related actions are collected as action characteristics through the research of human skeletal structure, node data and research on human actions. First, 3D information of human skeletons is acquired by Kinect depth sensors and the cosine of relevant nodes is calculated. Then human skeletal information within the time prior to current state is stored in real time. Finally, the relevant locations of the skeleton nodes and the variation of the cosine of skeletal joints within a certain time are analyzed to recognize the human motion. This algorithm has higher adaptability and practicability because of the complicated sample trainings and recognizing processes of traditional method is not taken up. The results of the experiment indicate that this method is with high recognition rate.
A Proposed Nonbinary Network Codes Applied in Wireless Broadcast
Authors: Chen Wei , Wu Jun , Huang Xin Lin
Published: September 2014

This paper proposes a new method of applying nonbinary network coding in wireless broadcast network. This network consists of T(T>2) users who receive common information independently from a common base station (BS). We assume that the transmission blocks are subject to block-fading with independent fading coefficients for each block, nonbinary network codes over finite fields are used on top of channel codes.We take two kinds of schemes, with ACK and without ACK, into consideration. In the first situation while considering ACK mechanism, the forward error correction (FEC) and retransmitted techniques are used and network code (NC) can diminish the retransmit count significantly. In the second situation while utilizing broadcast nature without ACK, the NC could help to rebuild losing packets, thus decrease block error ratio.We analyze the delay performance and block error ratio, and verify the analytical performance with simulation. Both simulation and analysis confirm the advantage of proposed scheme.
Recognition System for Fatigue Facial Expression of Driver
Authors: Wang Xue Mei , Zhang Jia Jun
Published: September 2014

In order to improve the accuracy of recognition system for fatigue facial expression of driver, driver fatigue expression of this paper, the detection method for key feature points in the fatigue facial expression image of driver is applied in the paper to establish a fatigue expression image recognition model based on attention mechanism. Experimental results show that the algorithm can improve the recognition rate of driver's expression image, so as to record fatigue expression image of driver more accurate.
Analysis of Hydraulic Press Servo System Based on Robust Controller
Authors: Feng Jing Chang , Kong Xiang Dong , Zhang Jin , Wang Li Juan , Liu Chun Qing
Published: September 2014

This paper researches and analyzes the modeling of electro-hydraulic proportional servo system to improve the characteristics of forging hydraulic servo control system and meet their requirements of forging a variety of materials. Based on robust compensator design, PID control strategy is proposed with uncertain disturbance of hydraulic press hydraulic servo system and the response characteristics of the system is simulated and analyzed. The results show that hydraulic press servo system which uses robust compensator has better performance than the traditional PID control and the chattering is eliminated. The test results and simulation results are compared by building simulation test system of 60MN hydraulic press electro-hydraulic proportional control system.
Cross-View Gait Recognition in 3-D Space Based on Gravity Center Track
Authors: Chen Xin , Yang Tian Qi
Published: September 2014

We propose in this paper a novel cross-view gait recognition method based on gravity center trajectory (GCT). Inspired by the finding that if the GCT of human in walking process has regularity, the representation coefficients of the trajectory are generally consistent across different views. We propose to project the coefficients of GCT to different view plane (VP) which is the normal plane of view angle direction vector to achieve view-invariant features for gait recognition. Firstly, we obtain the GCT under different views by summation of pixel coordinates in body area. Then, we use the least square method to eliminate the upward or downward trend of GCT caused by view variance. Then, we project the GCT function to the corresponding VP. Lastly, we perform recognition by using a simple cluster method. Experimental results on the widely used CASIA-B gait database demonstrate the effectiveness and practicability of the proposed method.
Preprocessing for Interference Fringe of Spherical Object Wave
Authors: Gao Fei , Xu Xian Feng , Jiao Zhi Yong , Li Dai Lin , Jia Yu Lei
Published: September 2014

A simple preprocessing method for interference fringe of holograms generated between spherical object wave fronts and plane wave reference is suggested. The formulae to calculate the diameters of the interference concentric circle and then to get the radius of spherical wave are deduced strictly and the flowchart for the algorithm is given clearly. By using the proposed method the characteristics of a spherical object wave can be achieved directly with only one recording frame and then a simulated one can be gained by numerical simulation. The corresponding experiments show that this technique is simple, effective and convenient for use.
Modified Ocean Clutter Cancellation Algorithm in Sky-Wave Radar
Authors: Lin Zhi Rong , Hu Jin Feng , Zhang Ya Xuan , Li Wan Ge , Ai Hui
Published: September 2014

In sky-wave over-the-horizon radar system, it is difficult to detect ship because the Doppler shift of the ship is very close to the strong ocean clutter. Traditional clutter cancellation algorithms suppress ocean clutter by estimating clutter parameters and removing the clutter signal in time domain. However, they estimate the clutter parameters by the maximum value of the post DFT spectrum and thus lead to the low accuracy. In this paper, a modified clutter cancellation algorithm is proposed, which corrects estimated frequency by utilizing the three maximum spectrum values and overcomes the poor cancellation performance caused by inaccurate estimation of clutter parameters. Compared with traditional clutter cancellation algorithm, the proposed algorithm can get more accurate clutter parameters and reduce the energy and expansion of the remaining clutter. Simulation demonstrated that the proposed algorithm had a better clutter cancellation performance compared to the traditional ones.
A Low-Cost Chaotic Radar Signal Design Method
Authors: Zhang Ya Xuan , Hu Jin Feng , Lin Zhi Rong , Li Wan Ge , Ai Hui
Published: September 2014

The matched filter of chaotic radar system proposed by Ned J. Corron can be implemented through low-cost analog devices. But the spectrum of transmitted signal of this system is dispersion, causing signal in the process of propagation prone to spectrum leaked. To solve the problem, this paper proposes a low-cost signal design method. In transmitter, making chaotic signal become a band-limited signal by filtering to shape the spectrum; in receiver, using synchronization and filtering to recover the chaotic signal. The proposed method is implemented with low-cost analog devices; in addition, the method is still valid when the SNR is as low as-20dB.
A Image Registration Algorithm Based on Wavelet Pyramid for CCD Image
Authors: Lu Gang , Kang J.P. , Zhai Z.N.
Published: September 2014

Image registration is the key process in analyzing images and data from satellites. Feature-based methods find correspondence pixels which point to the same place between two images. In this paper, a wavelet pyramid hierarchical image registration algorithm is presented. First mismatching exclusion policy on the top of pyramid is used. Other hand search strategy which gets the scope of the search layer on the bottom of the pyramid is adopted. Both of them rely on pair of matching-right points. Experimental results show that the algorithm can significantly improve the search efficiency, and obtain a good match accuracy and reliability.
Content Based Images Retrieval Based on HSV Color Space and GLCM
Authors: Su Ching Hun , Chiu Huang Sen , Hsieh Tsai Ming
Published: September 2014

We propose a practical image retrieval scheme to retrieve images efficiently. We succeed in transferring the image retrieval problem to sequences comparison and subsequently using the color sequences comparison along with the texture feature of Gray Level Co-occurrence matrix to compare the images of database. Thus the computational complexity is decreased obviously. Our results illustrate it has virtues of both the content based image retrieval system and a text based image retrieval system. Experimental results reveal that proposed scheme is better than the conventional methodologies.
Research of the Penetration Process for Concrete Target Based on the Extended Finite Element Method
Authors: Yan Ke Bin , Huang Zheng Xiang , Liu Rong Zhong , Wang Feng
Published: September 2014

The extended finite element method (XFEM) is the most effective numerical method to solve discontinuous dynamic problems so far. It makes research within a standard finite element framework and needs not mesh repartition to geometric and physical interface, so it reserves all merits of the conventional finite element method (CFEM). The XFEM was applied to the penetration process for concrete target in the paper, and the displacement mode of elements with cracks and fracture criterion were presented. Then the weak solutions of control equations were discretized in different areas. The numerical examples for steel rod penetrating in the concrete target concluded that the method and program were reasonable and effective. The effect discipline of crack growth to the concrete material penetration process was summarized, and it would establish theoretic base for the further application of the XFEM.
Study of Image Segmentation and Image Restoration Based on Variational Method
Authors: Shi Xiu Bo
Published: September 2014

People are very familiar to the image. Image can be obtained by optical instrument observation of the objective world or image in the eyes of people of objective scenery in the human visual system. With the development of computer technology, digital image technology has been widely used in scientific research, industrial, health care, education, entertainment and communication. Therefore, the research of image technology has vital significance. This article mainly research image segmentation and image restoration based on variational method. Image segmentation is to divide the image into some meaningful area, is the foundation of subsequent target recognition and image understanding.
FEM Analysis and Structure Improvement of Pinch Valve
Authors: Xiao Shu Fen , Zhang Yi , Li Xi Wen
Published: September 2014

Pinch valve is an important flow adjusting device in the operating system of polymer materials with characteristics of high viscosity and high solid content, and its service life limits its application and popularization. In this study, for the special application environment and requirements of clevis pinch valve in the operating system, the dual-parameter Mooney-Rivlin constitutive model of rubber and Linear Elastic model of clevis were used. The stress and strain distributions of the rubber hose, while completely closed, were obtained by means of FEM (Finite Element Method) analysis. Parameters of hose thickness and cone length of the rubber hose were optimized, and the structure-improved pinch valve was obtained as well. The strain energy release rate and fatigue life were analyzed for the improved rubber hose at the most dangerous cell.
Spectrum Analysis of Infrasound Signal
Authors: Wang Bin
Published: September 2014

In this paper, frequency spectrum of infrasound signal collected was analyzed based on MATLAB. The infrasound power level of change with frequency distribution and the infrasound harmonic of each frequency component of the sound pressure amplitude can be made up judgment visually by frequency spectrum analysis and amplitude spectrum analysis, and thus we can obtain different conditions of infrasound properties scientifically and quantitatively.
Investigation of Image Simulation Method of Morphological Algorithm on Organism Suffocation
Authors: Chen Lan Zhen , Lin Ru Dan
Published: September 2014

Reactiveness of respiratory Organs during organism suffocation is uneasy to obtain through clinical approach; this leads to difference between research and objective fact. Introduction of morphological algorithm can maximally restore organism response form through the measurement and simulation of dynamic changes of organism image with certain forms of structural elements.
Computationally Efficient Adaptive Sidelobe Blanker with Improved Mismatched Signals Rejection
Authors: Zhang Dai Yuan , Liu Wen Bo , Zhu Zhuo
Published: September 2014

This paper deals with the problem of adaptive signal detection in the presence of Gaussian noise with unknown covariance matrix. An improved adaptive sidelobe blanker (ASB) is proposed, which consists of an adaptive matched filter (AMF) followed by a whitened adaptive beamformer orthogonal rejection test (W-ABORT). A statistical characterization for the proposed two-stage test statistic is provided,under both noise-only and signal-plus-noise hypotheses. The associated probability of false alarm (Pfa) and probability of detection (Pd) are derived in closed form. The performance assessment confirms the effectiveness of the newly-proposed detection algorithms also in comparison to previously-proposed ones.
Modeling and Simulation of PTZ System Based on DC Torque Motor
Authors: Li Xiao Bin , Wu Hong Qi , Wang Jin , Yuan Zhan Jun
Published: September 2014

A kind of design scheme of PTZ control system based on DC torque motor was proposed to improve fast tracking ability and tracking accuracy of moving target. The mathematical modeling methods for each link were given and the parameters were determined with the help of engineering design method. The simulation results showed that the system had higher location accuracy, better tracking performance and could satisfy the design request.
Application of Wavelet Transform in Radar Echo Signal Level Meter Denoising
Authors: Leng Jian Wei , Guo Ya Ni
Published: September 2014

Radar Level Meter is being more and more widely used in the industry field. However, due to the complex radar system, the noise contained in the clutter echo signal, and the interference within the system and hardware, it is quietly significant to study the research of radar echo reduction technology. Based on the introduction of radar level meter ‘working theory, This paper presents a wavelet transform analysis of the echo signal de-noising method. Studies have shown that the radar echo signal processing method of using wavelet transform can effectively suppress noise, remove interference and achieve echo signal de-noising processing.
Simulation and Analysis of Performance of Turbo Coding
Authors: Guo Shao Ping
Published: September 2014

The Turbo coding ingeniously combine two simple component coders, use pseudo random interleaver parallelly to construct long code which obtains random characteristic , and take advantage of iterations between the two input/output (SISO)[1,2] decoder to realize pseudorandom decoding. This paper introduces encoding and decoding principle, design and simulation performance of Turbo codes. The simulation results prove that the design scheme is correct. From the spectral character we are acknowledged: not only can Turbo code effectively against the Gauss noise, but also has strong resistance to fading and interference properties. Based on our resuls, the Turbo code in modern communication has more advantages and will play more important role.
The Design of Signal Generator with DDS Based on FPGA
Authors: Jia Liang , Sun Wei , Ma Xing , Sun Jun , Wang Feng , Zhao Wen Qi
Published: September 2014

Direct Digital Synthesizer （DDS） is a new theory starting from the conceptual phase required for the direct synthesis of waveforms, This system in the FPGA chip and D/A conversion circuit, filter circuit, amplitude amplification circuit and power amplifier circuit's support to achieve a meet scheduled targets multiple waveform output.
The Collocation Method's Application on Low Earth Orbit Satellite Orbit Integration
Authors: Zhou Jian , Wu Xing Cun
Published: September 2014

This paper starts with the principle and operation approaches of Collocation orbit integration method, analyzing the integration process and initialization value of motion equation and variation equation. Through different integration lengths and polynomial degrees, this paper discussed the impact to orbit precision. It also compares the results to the scientific orbit which were offered by GFZ, through the analysis of this method; we also find the appropriate integration length and polynomial degree and validate the validity of this method.
The Application of DFT Technology in Soft Demodulation of π/4-DQPSK Signals
Authors: Wu Yan Jun , Fu Gang , Yu Peng
Published: September 2014

Presented to the π / 4 differential quaternary phase shift keying signal (π/4-DQPSK) using the discrete Fourier transform (DFT) for software demodulation algorithm in consideration of the actual received waveform into transition to π/4-DQPSK District and stable region, and only the waveform sampling point DFT transform the region stable recovery decision. simulation gives the demodulation method to achieve the same differential demodulation relatively simple structure, and the anti-noise in the signal to noise ratio greater than 3dB better performance than the differential demodulation performance, expected the algorithm is applied π/4-DQPSK software radio receiver design.
Research on Accuracy of Multi-Channel Star Tracker
Authors: Tong Shuai , Li Hui , Wang An Guo
Published: September 2014

Star tracker is an accurate autonomous attitude measurement equipment. Multi-channel star tracker has been widely used and the accuracy of multi-channel star tracker becomes an important issue to study. In order to study this issue, an error model of multi-channel star tracker is established and analysis of accuracy of multi-channel star tracker is carried out with the model. Simulation results show accuracy of multi-channel star tracker is much higher than the single channel ones. There is great potential to develop multi-channel star tracker in the future.
A Novel Design on Compact Slot Antenna with Multi-Band for WiMAX/WLAN Applications
Authors: Zhu Li , Gao Xiang Jun , Zheng Long
Published: September 2014

In this paper, a novel coplanar waveguide (CPW)-fed and miniaturized slot antenna for triple-frequency operation is proposed and investigated, which is printed on a small 20mm×20mm FR4 substrate with thickness of 1.0 mm and relative permittivity of 4.3. Through loading different slits, three perfect operating bands of 2.4GHz-2.45GHz, 3.25GHz-4.15GHz and 5.05GHz-6.25GHz are achieved respectively, when return loss is less than-10dB. Experimental results show that the antenna gives monopole-like radiation patterns and good antenna gains over the operating bands. Such antennas is suitable for WLAN 2.4/5.2/5.8 GHz and WiMAX 3.5/5.5 GHz applications.
Multi-View Video Signal Processing Based on Disparity Estimation
Authors: Wang Hui Lin
Published: September 2014

Disparity estimation is used to eliminate redund ancy among different views in multiview video coding in order to obtain high compression efficiency. This paper proposes a reference viewpoint selection method based on the judgment principle of block feature vectors and similarities, which can reduce complexity and increase coding performance under the premise that the coding quality is ensured. Experimental results have demonstrated the effectiveness of this algorithm.
A Hybrid SVD-DCT Watermarking Method Used for Halftone Image
Authors: Guo Qian , Chen Guang Xue , Luo Jian , Chen Qi Feng , He Zheng Guo
Published: September 2014

In this letter, a digital watermarking method which combines the singular value decomposition (SVD) and the discrete cosine transform (DCT) is presented. First of all, The Arnold scrambling and the DCT are performed on the watermark and the original image, respectively. The SVD transform is performed on the image when scrambled watermark is embedded, then the watermarked image is formed. Finally, we extract watermark from the image which is handled by halftone screens. The experimental results show that this method can achieve the highest possible robustness without losing the transparency. Also it can anti printing and scanning. All the processes do not require any additional equipment. It will bring new hope to the field of anti-counterfeiting printing with singular value decomposition is applied to the half-tone image area.
Research on the Geometric Distortion Auto-Correction Algorithm for Image Scanned
Authors: Zhang Jing , Chen Guang Xue
Published: September 2014

In the process of gaining digital images whether scanning or photographing, the rugged manuscript or the nonlinear characteristic of the camera lens, etc. may lead to severe geometric distortions of the captured images. Therefore, geometric rectification of the distorted images is necessary before they can be further processed. In this paper, A careful analysis was done on the cases of geometric distortion, and then an auto-correction method is deduced. In the correction process for image scanned, global thresholding was used to extract the feature region which was needed, use Sobel operator to detect edge, then use Hough transform to auto-extract the boundary. After Hough transform, some parameters associated with the control point were obtained for correcting images. Extensive experiments proved that it can recognize the outline fast and correct geometric distortions effectively. The results show that the method was applicable and had high accuracy.
An Improved Directional GVF Snake
Authors: Zhang Xue Fei
Published: September 2014

Gradient Vector Flow (GVF) Snake has been extensively utilized in handling image segmentation and classification problems. However, GVF Snake has a drawback in that it sometimes may fail to stop the snake at weak edges, especially at the locations where a weak edge is very close to a strong one or some noise. To guide the snake toward the appropriate edges, we have added gradient directional information to the external image force to create a “directional snake”. Experiments prove that the new model limits the influence of false edge, avoid the edge leak, and obtains desired segmentation results.
Research and Development on User Perception Analysis System for the PS Domain of TD-SCDMA Network
Authors: Ge Ting Ting , Xi Bing
Published: September 2014

KPI indicators of traditional user perception system can not accurately reflect user's perception. Based on the monitoring of Iu-PS interfaces, this paper describes a kind of user perception system of PS domain of TD-SCDMA network. Multi-index set, Multi-dimensional analysis and weight set are adopted to evaluate user perception. Through message decoding, CDR (call data record) synthesis and user perception model foundation, we can evaluate the sense of user perception synthetically, and it is applicable for fault location. First and foremost, the paper focuses on CDR synthesis algorithm and user perception model. According to the test of network data,it is verified that the test result is correct,and the effect is good.
The Dispersion Research Based on its OTN Network Backbone Optical Transmission Network
Authors: Zhao Zhen Dong , Pei Meng Meng , Xiao Rui Ju , Zhou Yi
Published: September 2014

In this paper, based on the practice optical transport network (OTN) electric power communication network business, through the modeling analysis shows the specific influence dispersion optical pulses, then discussed the dispersion compensation technology, through modeling and simulation analysis of the dispersion compensation fiber (DCF) and dispersion compensation module (DCM), at the same time with reference to its OTN equipment dispersion tolerance, form a light layer of dispersion compensation quantity calculation method of the experience and grid OTN networking dispersion compensation scheme, reduce the effects of dispersion as far as possible.
Researching the Information of Transmission Technology Based on Traffic Lights
Authors: Li Qiang , Zhang Xin Rui
Published: September 2014

This design is based on Visible Light Communication Technology, to achieve outdoor visible light communications and image recognition etc. through traffic lights. It will play a role on promoting the utilization of traffic lights. The system uses a LED dot matrix to imitate the traffic light, loading QR Code information on the LED dot matrix and then transporting it in a very high-speed flashing. In receiving terminal, first, webcam OV7670 collects information which from the LED dot matrix, then conveys the picture to FPGA, which is the processor. FPGA will handle the picture by gray scale processing, medium filtering and binary processing at last. Thus, the picture from the LED dot matrix will change to ‘0’ and ‘1’ in binary area. Secondly, as there’s a relationship between LED dot matrix and webcam pixels, we can count how many pixels represent one LED. Finally, we can decode the QR Code based on its own style, and display the final result on the TFT screen.
The Finite Element Analysis of a Heavy Semi-Trailer Frame Based on ANSYS
Authors: Ye Yao , Wu Yong Hai
Published: September 2014

Frame has important effects on the performance of the whole of heavy semi-trailer. A heavy semi-trailer frame is analyzed and researched on in the finite-element way in this article. The frame of 3D geometric model is established by using Pro/E. And it was imported into the Hypermesh to establish frame finite element model. Frame are calculated by using ANSYS solver in bending condition, emergency braking conditions and rapid turn conditions of stress and deformation conditions. The computational tools and methods we used provide the new type of frame and development with a reference method to refer to in this paper.