bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Machining of AISI1045 Based on Thermodynamical Constitutive Equation
Authors: Shao Fang , Yan Xue , Wang Yu Ting , Zou Li Jing
Published: July 2013

In this paper a finite element analysis (FEA) of machining for AISI1045 is presented. In particular, the thermodynamical constitutive equation (T-C-E) in FEA is applied for both workpiece material and tool material. Cutting temperature and tool wear depth are predicted. The comparison between the predicted and experimental cutting temperature and tool wear depth are presented and discussed. The results indicated that a good prediction accuracy of both principal cutting temperature and tool wear depth can be achieved by the method of FEA with thermodynamical constitutive equation.
The Technology of Circular Parts Precise Measurement Based on Binocular Calibration
Authors: Wang Chuan , Yang Jie , Zhou Yan Wei
Published: July 2013

A method of measuring the radius of circular parts by binocular stereo vision technology is proposed. First of all the interior and exterior parameters of cameras are acquired by the camera calibration technology. Then the epipolar constraint can be calculated which contains the calibrated information. The image matching which uses the epipolar constraint is done to find the matching points. The three dimensional (3D) coordinates of edges points are reconstructed through trigonometry reconstruction. At last the analytic expression of the plane in which the circle lies and the circles radius are calculated in two steps by Levenberg-Marquardt (LM) algorithm. The proposed method does not require the prior knowledge of position between the measuring plane and the calibration plane which monocular measurement needs. Experimental results show that the measurement has high precision.
Modeling and Faults Simulation of Aircraft Landing Gear System
Authors: Guo Wei Gang , Han Wei
Published: July 2013

The model of aircraft landing gear hydraulic system is build by software of AMESim. Under the AMESim environment, a hydraulic simulation of the nose landing gear of aircraft is constructed. The simulation model of the component is built by graphical modeling method. Setting two case faults parameters of landing gear actuating cylinder leakage and air into oil, it obtains faults symptom of hydraulic system. The Internal characteristics, Interrelation and motion Law is shown for landing gear system various components. Combining hydraulic system simulation with fault diagnosis effectively, it can provide reference for fault analysis and design improvement of landing gear hydraulic system.
LPG/Gasoline Dual-Fuel Engine Design and Investigation about its Performance
Authors: Liu Wei , Liu Sheng Ji , Kuang Xin , Sun Jian
Published: July 2013

In order to burning LPG and gasoline and dual fueled (LPG and gasoline) in the same engine, a new multi-function engine was refitted and designed based on 188F gasoline, mutative effects on the power and emission performance when burning those three kind fuel were investigated by the engine operated with the US EPA Phase-Ⅱ. Three schemes for the carburetor throat were designed. Balanced of the power and economy performance, when the diameter of the carburetor throat is 23mm, the performance was the best. By carrying engine performance test and the combustion process analysis, the results showed that: when the throttle was full opened, the power of burning only gasoline was 7.97kW, 0.5 kW and 0.28kW higher than burning LPG and dual –fuel. Burning gasoline pressure curve with the crank Angle siege area is the largest. As the emission test shows, when separately burning LPG and gasoline and dual fueled, the tendency of the excess air coefficient and the emission characteristics with the load change are same. When using LPG and dual-fuel, compared with burning gasoline, HC and NOx emission were reduced.
The Rolling Mill Deviation Analysis and Improvement in Hydraulic Pressure
Authors: Yuan Kai Shi , Chen Long Long , Guan Sheng Qi
Published: July 2013

This paper introduces the working principle and the failure phenomenon of the steel hydraulic station of Xian steel rolling mill, Shaanxi Longmen Iron & Steel Co., Ltd. We made a synthesis of the reasons of the failure phenomenon. On this basis, we put forward the improvement measures about the steel hydraulic system. The work showed that this improved method can effectively solve the failure phenomenon of the Steel hydraulic station, thereby achieves good results and a certain economic and social benefit.
A Novel Approach for the CAM-Follower Mechanism of High Frequency Cutting File Machine
Authors: Seabra Eurico , Puga Hélder , Ferreira Da Silva Luis
Published: July 2013

In this work, the re-design of the camfollower mechanism of an industrial cutting file machine is presented. The actual mechanical system includes a forceclosure cam mechanism, which requires an external force to keep the contact between the cam and the follower provided by a spring. This system is substituted by a new cam mechanism of the type of formclosure, which does not require external force. The formclosure camfollower mechanism, also called positive-return cam mechanism, guarantees that the cam surface is always in contact with the follower surface, and is characterized by having constantbreadth. Classical Mechanic Theory performs the study of the kinematic and dynamic characteristics of the cam mechanism analyzed throughout this work. Furthermore, a commercial package software was used to create a virtual model and analyze the motion characteristics of the new cam mechanism.
Study on Supplies Loading of Equipment Support Force
Authors: Sun Yang , Wang Xin , Zhang Ke Peng , Tang Xiao
Published: July 2013

This paper mathematically described the supplies loading problem of military equipment support dispatching force. Through taking all supplies average loading as the objective function, taking the same kind of supplies group loading, no overweight and overcapacity, no-repeated loading and packing as constraint conditions, optimization model was put forward. And the effectiveness of the model was validated by the example computation.
Horizontal Force on Tire Gantry Crane
Authors: Lu Meng Long , Gui Zheng
Published: July 2013

Difference of trolley traction distribution and slip angle of tire wheels may cause extra horizontal force to legs of tire gantry crane. The case and cause were studied to estimate the force for the crane design, control, and operation. And that was compared with one specialized in the design rules of rail gantry crane. It can be found that under proper control and operation condition the later can also be applied to the tire gantry crane.
Finite Element Analysis of the Swing-Rod Constraint Reciprocating Piston-Type Oil-Free Air Compressor
Authors: Geng Kui Hua , Guo Jing , Su Wen Gui , Du Shi Guang
Published: July 2013

Based on finite element analysis technology, a static simulation model of the swing-rod constraint reciprocating piston-type oil-free air compressor was established for stress analysis of the compressor. Simulation results show that the stress in the main parts of the new compressor is within the permitted range, so structure design and parameter setting of the compressor are reasonable. Moreover, the force condition of seal rings is improved by adding swinging-rod constraint mechanism, which will prolong the service life of seal rings. With this study, these simulation results will guide further modification and performance improvement of the compressor.
Finite Element Parametric Acoustic Modeling and Analysis of Ship Floating Cabins
Authors: Liang Bing Nan , Yu Hong Liang
Published: July 2013

The development of parametric calculation module program based on APDL, the completion of 3D acoustic modeling of a ship floating cabin, the selection of constraints according to the actual work situations, the finite element modal analysis of the overall cabin in the ANSYS environment and comparative analysis of a low-order vibration frequency of the cabin under different fire ratings. Acoustic calculation program of the fluid-structure interaction is used to analyze harmonic sound field and verify the impact of different thickness fireproof rockwools on the cabin acoustic performance. Parametric Design and Finite Element Analysis are combined to achieve the adjustment of the structural parameters of the complex models, automatically generate solid models and complete finite element analysis, which is important for the optimization of the acoustic design of the ship cabins.
The Calculation of Product Carbon Footprint and Optimization Design
Authors: Ma Hai Shu , Zhou Chuan Hong , Wang Ke Sheng , Xiao Jin Jie
Published: July 2013

With more and more governments and organizations taking Carbon Footprint as the measure of greenhouse gas emission, the study about the calculation of carbon footprint has become a hot spot. The paper analyzed the carbon footprint in different stages of a product life circle, including manufacturing, transporting, using and disposing and also studied the part contributing the largest carbon emission. Especially in the calculation of carbon emission of manufacturing stage, recursive call algorithm was applied. The optimization design model of carbon footprint was also depicted. All the work this paper had undertaken facilitates to formulate specific carbon emission reduction measures.
Study on Classified Collaborative Training Mode of the Applied Graduate
Authors: Hu Jie , Huang Qiong
Published: July 2013

With the economic and social development, the classified cultivation of graduate students is the inevitable requirement of high-level personnel supply, and at the same time, it is the opportunity for the self-improvement and self-renewal of higher education. In this paper, the present situation and the problems of the classification training of graduate student are analyzed.Taking the graduate training practice of Sichuan agricultural university as an example. The paper discusses about how to improve the quality of graduate student education more effectively and the comprehensive ability of applied graduate students. Finally this paper comes up with the classified collaborative training mode.
An Index Evaluation System for the Life Cycle of Assets Management under the New Environment of Power Grid
Authors: Deng Jian
Published: July 2013

The evaluation index system of life-cycle asset management is the basis of scientific assessment of power grid assets management level, is the carrier of the grid quality operation. This article in view of the new requirements for the whole life-cycle of asset management under the new environment, Construct a four layer tree evaluation index system, to conduct a comprehensive evaluation on the level of assets management. Realizing the maximization of benefits, and make power grid in safe and stable operation at the same time.
Evaluation Research in E-Learning System
Authors: Wu Bing , Zhang Chen Yan
Published: July 2013

We review on the literatures gleaned from science citation index expanded (SCI-EXPANED) and Social Sciences Citation Index (SSCI) database on web of science, concerning evaluation research in E-Learning system. The result indicates that the number of citation literature on this topic mainly distributes in recently 7 years, reaching climax of 30 in 2012 and then followed by 2011. The main research territory is Taiwan. And from the analysis of research area, computer science accounts for 83.3333%. Accordingly the percentage of source title as computers education is 41.667%. The related research can be classified into evaluation part of the system and evaluation the whole E-Learning system.
The Design of Comprehensive Performance Test-Bed of Automobile Electric Power Steering System
Authors: He Ze Gang , Tai Xiao Hong , Shen Rong Wei , Han Jiong Gang
Published: July 2013

A kind of comprehensive performance test-bed of automobile electric power steering system was designed. IPC was applied to the main control system. Testing software was developed based on Visual Basic. AC servo system was assembled to respectively simulate input torque and load torque, the manual input torque can also be realized by operating steering wheel. The motion control card MPC08 is used to control the motion of Servo motor. Test data is collected by using multi-function data collection card. The lifting gears were assembled to install input/output shaft servo motor and EPS. Test results show that the test-bed can verify the control strategies and accurately detect the assist characteristic of EPS.
Research and Implementation of Temperature-Rise Test System for Electric Vehicle Charging Coupler
Authors: Zhang Xuan , Li Zhi Ming , Li Xu Ling
Published: July 2013

The safety performance of Electric Vehicle (EV) charging equipments during the charging process will be the critical factor to the development of EVs Industry. Because of the high investment costs and the low accuracy of temperature-rise test system for EV charging coupler, a new remote test system including virtual instrument LabVIEW technology and communication transformation technology is applied to practical work. One temperature-rise test system designed for EV charging coupler is shown in this paper. With the advantages of LabVIEW as graphic programming and multithreading, real-time data acquisition, on-line monitoring and dynamic data preservation can be achieved by this temperature-rise test system. This test system simulates the change status of current data and makes a comprehensive research and evaluation temperature-rise characteristics of the charging coupler by analyzing the collected parameters and historical data when charging for EV.
Surge Voltage Suppression Circuit Design of On-Board SCR Controller
Authors: Liu Tai Long , Jin Hua Biao , Wu Qi Dou , Li Peng , Huang Long , Yu Fang Ping
Published: July 2013

SCR controller is one of the components of the SCR system, which should pass the test pulse 5b. The features and test requirements of pulse 5b are introduced. Its energy is very large, so passing the test is difficult. Two surge voltage suppression circuits are designed. The first design utilized a surge stopper-LT4356, its work process includes fault timer period, warning period and cooling period. During the cooling period, the SCR controller cannot work normally. So connecting a capacitor in parallel to the output of the surge voltage suppression circuit is used to improving its performance. The second design utilized two pieces of TVS, since the test pulse is continuous, steady state power dissipation must be considered when choose TVS. Finally, it verifies the feasibility of the two design schemes by experiments and leads to a selection criteria for them.
The Analysis and Correction of Time-Delay in the Precise Acoustic Measurement System
Authors: Huang Zhi Gang , Qiao Chun Jie , Ma Chao , Zhao Shen
Published: July 2013

The acoustic transducer is a nonlinear system, which will cause a time delay to signals. The system group and phase delay have a large influence on the results in the transmit-time measurement. In order to solve the problem, this paper proposes to use the signal phase difference to eliminate the phase delay, and precisely determine the group delay by the method of experiment. At first, this paper theoretically proves that the group delay of the acoustic measurement system is constant, and the phase delay changes over signal frequency, then it analyzes the influence of group and phase delay on the measuring results and meanwhile puts forward a method to use the multi-frequency signal phase difference to eliminate group delay .Finally, it achieves the group delay through experiments, and there is a good consistency between the experimental results and theoretical analysis.
Improvement of DC System Insulation Monitoring Device
Authors: Deng Chen Hua , Wang Li Xin , Shao Tian Yu , Deng Lei
Published: July 2013

Based on the analysis of advantages and disadvantages of the DC system insulation monitoring principle, a new DC system insulation monitoring device is put forward, which is a combination of balanced bridge and switching resistance. Bus voltage detection circuit and branch drain current acquisition module are designed to monitor the insulating state of bus and branch, respectively. The STM32 microcontrollers are used as master MCU and acquisition MCU. In this way, a decentralized modular multi-core detection structure is established. Further, the hardware and software parts of the DC system insulation monitoring device are designed in detail. By testing the prototype in a variety of ground states, the accuracy of ground resistance measurement, branch positioning and fault alarm is verified.
Single-Phase Prepayment Meter Based on RFID+STS
Authors: Qing Bai Yuan , Li Gang , Zeng Bo , Teng Zhao Sheng
Published: July 2013

The emergence of the radio frequency type prepayment meter will guide the inhabitant energy meter management toward automation from IC card management and the artificial metering work. In this paper, it introduces the principle of the single-phase prepayment meter based on radio frequency identification (RFID), develops a method of energy sale management that integrates radio frequency identification and IEC62055-41 standard transfer specification (STS), and designs its hardware and software. This design makes full use of the advantages that radio frequency card is passivity and non-contact, and STS is a sound and versatile specification. The production practices shows that the radio frequency card reads and writes stably, has strong ability of anti-interference, delivers data credibly, and the management is real-time and convenience.
Development of New Type Centralized Engineering Seismograph
Authors: Yan Jin Feng , Deng Ming , Li Yan Jun , Zhang Qi Sheng
Published: July 2013

SoPC technology is a high-performance, low-power consumption embedded system solution based on embedded microprocessor, providing a new way for developing new type centralized engineering seismograph. The paper presents the development of a new type centralized engineering seismograph based on SoPC technology, which adopts FPGA design based on SoPC technology for the hardware design and embedded software program development of the 48-channel engineering seismograph. According to actual needs of currently available centralized engineering seismograph, combining the actual characteristics of SoPC embedded technology, a portable, low-power consumption and high-performance new type centralized engineering seismograph is constructed. The paper describes the hardware design and software program implementation of the centralized engineering seismograph in detail.
Measurement of Piezoelectric Strain Constant Based on Virtual Instrument Technology by Dynamic Method
Authors: He Long Biao , Zhang Rui Wen , Zhu Hai Jiang , Yang Ping
Published: July 2013

Characteristic parameters of piezoelectric ceramic have immeasurable effects on its performance. On the basis of the equivalent circuit of piezoelectric ceramic, dynamic resonance method is used to measure a series of cylindrical piezoelectric coefficients. Based on labview virtual instrument technology, an automatic measurement system with Agilent E4980A impedance analyzer is developed. The characteristics of impedance frequency response are recorded and the admittance circle is drawn. Then the major parameters including d33 are measured automatically and the reports are generated. Finally, E-S(Electric-Strain) method is adopted to verify the reliability of the measurement results. The results showed that the dynamic resonance method had good repeatability with the standard deviation no more than 1.66%, and the test values were in accord with the E-S method.
Study on Noise Testing Based on Qin's Model
Authors: Wen Cheng , Zhou Chuan De
Published: July 2013

On the basis of the introduction of new virtual instrument development model, Qin's model, this paper discusses the virtual instrument development theory and analyzes the characteristics of this development mode. Based on the discussion above, the noise analyzer with practical test function was developed and the correctness and feasibility of development mode of the virtual instrument were verified.
Experiment Studying of Multiwavelength Erbium-Doped Fiber Laser with Ultra-Small Wavelength Spacing
Authors: Zhu Zong Jiu , Niu Yuan Yuan , Cai Jia Xing , Yan Peng Cheng
Published: July 2013

The configurations of Erbium-doped fiber laser and comb filter that work stably have been designed. The stable multiwavelength oscillation of erbium-doped fiber laser with wavelength spacing 0.20nm in 1532nm band had been obtained at liquid nitrogen temperature by optimizing length of erbium-doped fiber and loss of cavity. The experimental results show that, the erbium-doped fiber exhibits obviously different inhomogeneous gain broadening in different band.
Pose Estimation of Cooperative Targets for Space Exploration Task Based on Binocular Visual Measurement
Authors: Wang Jing Jing , Huang Jian Yu , Qin Shi Yin
Published: July 2013

In this paper, a high accuracy and efficiency pose estimation algorithm is proposed for space cooperative targets in RVD based on binocular visual measurement. At first, the scheme of visual measurement toward RVD is presented and the environment conditions and performance requirement are analysed and discussed. Then the relationship of pose estimation with detection and tracking is studied to give an implementing strategy of pose estimation with high accuracy and efficiency. Moreover, the key point is focused on the pose estimation of cooperative targets, in which a stereo vision mapping relation between three dimensionl coordinates of spacial feature points of cooperative targets and their corresponding image coordinates is established, then the least square method is employed to estimate the three-dimensional coordinates of feature points so as to calculate the relative position and attitude between tracking spacecraft and target spacecraft with high precision, finally a series of experimental resluts indicate that the proposed pose estimation algorithm under binocular visual measurement demonstrates well performance in the estimation accuracy, anti-noise and real-time thus can achieve the application requriements of RVD under binocular visual measurement.
Design of Ultrasonic Distance Measurement System Based on Microcontroller
Authors: Xiao Zhi Hong , Wu Si Yu , An Qi Yuan
Published: July 2013

The principle of an ultrasonic distance measurement system is introduced. The system adopts non-contact measurement method and it consists of signal generator, echo receiver circuit, microcontroller, time sequential logic control circuit, target distance detection circuit, temperature measurement circuit, RS-485 serial interface circuit, ultrasonic sensor and its driver circuit, etc. The results show that the system has high precision within measuring range from 20cm to 15m.
Research of EMT System Spatial Resolution
Authors: Zeng Wei Wei , Gu Jun , Lu Xin Juan
Published: July 2013

The paper presents the construction of the sensor array and do research on the spatial resolution of EMT system. As it directly determines the detection performance of the system. Rigorous experiment schemes have been designed to test and verify the spatial resolution of EMT system. And then, the application performance of the EMT system is shown.
A Dynamic Voltage Compensation Method for Improving Weighing Accuracy
Authors: Yin Rong Sen , Yang Jia Qiang
Published: July 2013

In order to eliminate the measurement error caused by working voltage fluctuation of weighing sensor, a dynamic voltage compensation method for improving the weighing accuracy was proposed in the paper. The method takes strain gauge type pressure sensor as the weighing sensor and corrects Wheatstone bridge circuit. By synchronously detecting output voltage signal and working voltage of the weighing sensor, the method dynamically compensates the working voltage fluctuation of the weighing sensor, corrects the measurement error caused by the voltage fluctuation of external source and calculates the weight in real time. A weighing system based on the digital signal processor (DSP) was designed. Results of simulation experiment verify the feasibility of the proposed method.
Design of Pressure Fluctuation Measurement System for Hydro-Turbine Model Test
Authors: Wang Hong Jie , Liu Shi Xun , Li De You , He Xiao Lin , Wei Xian Zhu
Published: July 2013

With the operation of giant unit of hydroelectric plant represented by the Three Gorges Power Station, the vibration problem of hydraulic turbine set unit is increasingly outstanding, especially the vibration of structure induced by pressure fluctuation. In order to guarantee the normal operation of unit, model test is more important in the respect of predicting performance, increasing stability and avoiding vibration. The pressure fluctuation measurement system based on LabVIEW according to pressure fluctuation model test was designed in this paper. The system is applied to the hydro-turbine model test-bed of HEC so that real-time automatic test with the characteristics of high stability and precision is implemented successfully. It plays an important role in respects of mastering the operation characteristics collecting and analyzing pressure fluctuation signals. Moreover it is meaningful to the hydraulic engineering.
On-Line Measurement of Fiber Diameters along Spinning Line
Authors: Wen Xin , Yang Sheng Lin , Li Guang
Published: July 2013

A laser sensor based equipment was assembled for on-line measuring the fiber diameters during the polymer spinning. The analog signals come from laser sensor were detected by using a data acquisition instrument and transferred into digital ones, which were processed in time with Labview. In a typical experiment, the diameters of polypropylene fibers were tested under different spinning speed by means of that pre-calibrated on-line measurement equipment, and the testing results were compared with those obtained from the numerical simulation of spinning dynamics. It has been found the on-line diameter measurement could promise high-speed, highly reliable and flexible testing.
A Decoding Strategy for Amplitude-Discriminating Type Twin-Channel Brushless Resolver Decoding System Based on AD2S80A Chip
Authors: Liu Guang Qi , Zhou Wei Jia
Published: July 2013

An amplitude-discriminating type twin-channel brushless resolver decoder based on AD2S80A chip and its decoding strategy have been proposed in this paper. The decoder uses two AD2S80A chips as resolver-to-digital converter (RDC). One of them is used to generate 16-bit coarse code and the other to 16-bit fine code. Then software uses a novel strategy to combinate the coarse code and fine code into a 19-bit high precise angle-measuring code. Finally, an experiment has verified the strategy which is practical for high precise angle position sensing. // <![CDATA[
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Design of High-Performance Vehicle Multi-Axis Optical Encoder Data Acquisition System Based on PC104 Bus
Authors: Wang Hua Pei , Ji Dong , Chen Dong
Published: July 2013

A high-performance vehicle multi-axis optical encoder data acquisition system based on PC104 bus is introduced. The paper puts emphases on the main function of the system module. VHDL hardware description language is used to design the modules, and ModelSim is introduced to implement logic and sequential simulation. An experiment is carried on in Altera EPF10K40 chip. Both the simulation and experimental results verify the correctness and validity of the method.
Design of Equivalent Sampling Based on Printed Circuit Board Suited for Power Communication System
Authors: Liu Chuan , Huang Zhi Chao , Wu Peng , Chen Lei , Wang Wei
Published: July 2013

Many applications in Power communication system have a demand of adjustable transmission time delay of high-speed signal. In sequential logic circuit, the control of transmission time delay of high-speed signal can effectively improve the accuracy of clock sampling, as a result, satisfy the constraints between clock signal and periodic data. A method of equivalent sampling based on printed circuit board (PCB) is provided in the article, it realizes equivalent sampling of the data by fixing a group of clock signal delay, thus, increase the accuracy of sampling.
A Real-Time Processing Method of Underwater Ambient Noise Spectrum Based on One-Third Octave
Authors: Ma Chao , Qiao Chun Jie , Wang Yue Ke , Zhao Shen
Published: July 2013

Extended, continuous measuring and analysis for underwater ambient noise can find the objects like ships and submarine. It is important for passive detection of underwater object. A real-time processing method of one-third octave spectrum is presented. It is shown by tests that the method is steady and satisfy the real-time processing.
The Method Based on Pattern Filter for Sonnd & Vibration Signal
Authors: Lv Miao Rong , Wei Bao Jian , Lu Jian , Diao Jian Bo
Published: July 2013

The difficulty of the signal processing is not the acquisition of the signals, but how to get the reasonble interpretations from the signals. Since the 1960s, Wavelet Transform, Fast Fourier method and other theoryies have done some works by some innovative processing methods to achieve a breakthrough. But for their limitions, these methods can not achieve a complete separation if the there are two or more signals in one time domain or frequency domain. In this article, a new engineering signal processing method-pattern filter method has is introduced, by which the signal extraction, sepration and noise reduction can be achieved successfully. Experiments show that this method can not only make a reasonable separation of the various vibration signals, but also give the typical signal extractions and model building ways.
The Algorithm of Digital Modulation Recognition Based on Stochastic
Authors: Xiong Mei Ying , Xiong Shui Ying
Published: July 2013

The traditional digital modulation recognition methods have high requirements for the SNR. This paper presented a good identification method. The quadratic stochastic resonance for signal processing cascade was proposed, then the signal characteristics of high order cumulants were extracted and the support vector machine was used for classifier, simulation results showed that the correct identification rate was up to 88% or more when the SNR was low as-8dB. The bistable stochastic resonance treatment can effectively improve the SNR.
Software Digital Lock-in Amplifier in the Application of fNIRS System
Authors: Yin Xu Xian , Xu Bao Lei , Wang Zhi Dong , Li Hong Yi , Gang Shi
Published: July 2013

Lock-in amplifier is particularly important in the fNIRS-based system, because the lock-in amplifier can recover the low-level signals buried in significant amounts of noise. But the price of lock-in amplifier is very expensive. This paper presented a software method for designing digital lock-in amplifier. Compared with analogue lock-in amplifier, results show that software lock-in amplifier is feasible for experimental research and can replace the expensive analogue lock-in amplifier.
An Optimised Signal Reconstruction Algorithm for Compressed Sensing
Authors: Wang Zhao Shan , Lv Shan Xiang , Feng Jiu Chao , Sheng Yan , Wu Zhong Liang , Tu Guang Hong
Published: July 2013

Signal recovery is a key issue in compressed sensing field. A new greedy reconstruction algorithm termed Optimised Stagewise Orthogonal Matching Pursuit (OSOMP) is proposed, which is an improved version for Stagewise Orthogonal Matching Pursuit (StOMP). In preselection step, OSOMP chooses several coordinates with a calculated threshold to accelerate the convergence of algorithm. In following pruning step, a small proportion of selected coordinates are discarded according to the amplitude of estimated signal, thus most false discovered coordinates can be swept away. Experimental results show that in OSOMP, the scale of estimated support can be controlled very well, and the successful recovery rate is also much higher than that in StOMP.
A Combined Application of Laser Tracker and Spatialanalyzer in Alignment of Accelerator
Authors: Cai Guo Zhu , Man Kai Di , Wang Shao Ming , Chen Wen Jun , Yuan Jian Dong
Published: July 2013

The paper introduced the application of laser tracker in the 3D alignment and installation of accelerator. USMN(Unified Spatial Metrology Network) in the SA(SpatialAnalyzer, a software) was used to solve 3D control-survey network in l00m scale, the tracker with SA can measure data and check results for fiducialization, guide the magnets installation and best-fit smoothing orbit. SA made the data stream consistent and reliable, and final the accuracy of 0.15mm transverse over 10m distance. this method also can be used in the installation of great science facility.
Application of Motion Detection Algorithm in Patient Monitoring System
Authors: Liu De Fang , Deng Ming , Chen Hai Yan
Published: July 2013

The paper proposes a smart, reliable and robust algorithm for motion detection, tracking and activity analysis. Background subtraction is considered intelligent algorithms for the same. Mount the web camera focused to the patient. PC should have a unique external Internet IP Address. Android mobile phone should be GPRS enabled. GSM technology is used for sending SMS. It is a client-server technology wherein client captures the images, checks for motion if any, discards the packets until motion is detected. Use background subtraction algorithm to check the motion. The surveillance camera does not move and has a capture of the static background it is facing. It uses image subtraction to determine object motion. It provides more reliable information about moving object, but it is so sensitivity to the dynamic changes such as lighting. Once motion is detected, camera stops monitoring further motion. Instead, it starts capturing the video. Simultaneously, SMS alert is sent to the responsible doctors and also alerting the medical staff with audio speaker in the hospital. Java mail API is used to mail the captured video to the entered e-mail IDs. Once the doctor demands for video, socket is established between the PC and the mobile phone and video (series of images) are streamed to the doctors mobile phone. Save live video of first few seconds at the server end for future use. Activate alert at the remote end.
The Method of Polarization Filter Based on Oblique Projection Operators in Process of Multi-Component Acquired Data
Authors: Guo Hu Sheng , Yan Bing , Li Xiang
Published: July 2013

Polarization filtering is an effective method to process the ocean bottom multi-component seismic data but distort signal amplitude and phase. To solve this problem, a method of polarization filter based on oblique projection operators (OOPF) in process of ocean bottom multi-component seismic data is proposed in this paper. First, we compute polarization parameters based on singular value decomposition (SVD); secondly, an oblique projecting polarization is construct by polarization parameters, finally, the simulation and experiment data results and indicates that the proposed method effectively processing the ocean bottom multi-component seismic.
Action Recognition Based on Motion Representing and Reconstructed Phase Spaces Matching of 3D Joint Positions
Authors: Zhao Yan Tao , Zhang Bo , Zhang Xu Guang , Li Xiao Li , Fu Mei Ling , Feng Si Yuan
Published: July 2013

This paper presents an efficient and novel framework for human action recognition based on representing the motion of human body-joints and the theory of nonlinear dynamical systems. Our work is motivated by the pictorial structures model and advances in human pose estimation. Intuitively, a collective understanding of human joints movements can lead to a better representation and understanding of any human action through quantization in the polar space. We use time-delay embedding on the time series resulting of the evolution of human body-joints variables along time to reconstruct phase portraits. Moreover, we train SVM models for action recognition by comparing the distances between trajectories of human body-joints variables within the reconstructed phase portraits. The proposed framework is evaluated on MSR-Action3D dataset and results compared against several state-of-the-art methods.
Application of Virtual Reality Technology on Digital Scenic Spot
Authors: Zhu Ye , Huang Zhen Fang
Published: July 2013

The digitization construction of scenic spot, a part of intelligent tourism, has aroused wide concern and achieved some successes. But problems still exist, for distance, the display of tourism information is incomplete, interactive experience is poor and intelligent management is unattainable. In essence, digital scenic spot is an intellectualized and visualized area supported by 3s technique, Multimedia technology, virtual reality technology, etc. Applying virtual reality into the tourism is a wonderful measure, which favors the promotion of digital scenic spot, dynamic planning and online virtual tour. Based on discussing the status of application of virtual reality, the paper puts forward some suggestions about ideas, platform and system for its further construction.
Articulated Arm Length Calibration for Cantilever Coordinate Measuring Machine
Authors: Ran Hong Lei , Liu Shu Gui , Zhang Hai Tao
Published: July 2013

Cantilever CMM(short for coordinate measuring machine) is non-orthogonal type one with large measurement range, small volume, light weight, low cost, but lower precision. Error calibration and compensation is an important way to improve the measurement accuracy. This paper presents a new calibration method for the length of articulated arm just using the square. Facility requirement is relatively low and it is easy to operate. Comparing with that measured by laser interferometer, this method has a relatively high accuracy, having a certain value in practical measurement.
Design and Realization of the Birdsong Analysis and Identification System
Authors: Zhou Jun , Wu Xing , Chi Yi Lin , Nan Pan , Wang Xu , Liu Yi
Published: July 2013

On the basis of LabVIEW platform, a birdsong analysis system –Song Lab which has variety of analysis functions and able to handle the large amount of data files was developed. The related key techniques of system design and development are researched in this paper, including large data processing, color adjustment, the processing of feature information, etc. The function of large data processing is used to solve data reading efficiency problem, color adjustment are applied to adjust the appearance of the spectrogram plot, and feature information is used to realize the characteristics of information extraction, analysis and comment. Finally, the birdsong analysis and identification system is built and some substantiation analysis has been made with the sampled data using this software, the results indicate that this system has accurate analysis results; it can provide a good technical support for researches in the field of animal acoustics.
The Chinese Microblog Emotional Tendency Analysis Based on Sentiment Dictionary
Authors: Tan Cheng Fang
Published: July 2013

With the Web 2.0 development, microblog has become the current hot spots.To HowNet Sentiment dictionary-based, and the current dictionary of commonly used network terminology adds microblog emotional, Sina API access to data, to build the microblog sentiment dictionary, for the Chinese microblog emotional information analysis, the experimental results show that the analytical methods microblog text emotional tendency analysis with good results.
Road Extraction from High-Resolution Remote Sensing Images Based on Synthetical Characteristics
Authors: Chen Yong Sheng , Hong Zhi Jia , He Qun , Ma Hong Bin
Published: July 2013

Road extraction is the recurring important application of high-resolution remote sensing images. In order to achieve the goal of road extraction, the various characteristics of geographic information of high-resolution remote sensing images as well as the application and models of road extraction are analyzed, then an effective way of extracting roads from high-resolution remote sensing images is found, and then the high-resolution remote sensing image road extraction algorithm based on texture characteristics assisted by other characteristic information is put forward. The specific process of road extraction in the algorithm is introduced, and the function of road extraction of urban high-resolution remote sensing image based on texture characteristics is also tested practically, the result shows that this method has a higher degree of accuracy in extracting roads from urban high-resolution remote sensing images.
A Realization of Face Detection System Based on ARM Linux
Authors: Zhao Cong Ting , Wang Hong Yun , Li Jia Wei , Ying Zi Lu
Published: July 2013

In order to adapt to the requirements of intelligent video monitoring system, this paper presents an ARM-Linux based video monitoring system for face detection. In this system, an ARM processor with a Linux operating system was used, and the USB camera was used to capture data, and then the face detection was conducted in the ARM device. The OpenCV library was transplanted to Linux embedded system. The algorithm of face detection was realized by calling the OpenCV library. Specially, adaboost algorithm was chose as the face detection algorithm. Experimental results show that the face detection effect of the system is satisfactory and can meet the real time requirement of video surveillance.
Kernel Graph Cuts Segmentation for MR Images with Intensity Inhomogeneity Correction
Authors: Luo Qing , Qin Wen Jian , Gu Jia
Published: July 2013

Since the phenomena of intensity inhomogeneity in MR images are prominent and adversely affect quantitative image analysis .In this paper ,we propose a novel magnetic resonance (MR) image segmentation approach based on the kernel graph cuts technique .Because of automatic multiregion segmentation and global energy minimization ,the kernel graph cuts method can be applied to many kinds of images segmentation ,such as MR images and so on . To reduce or eliminate intensity inhomogeneity in MR images ,we add the intensity inhomogeneity correction step which is based on fuzzy c-means (FCM) algorithm before the segment procedure .Firstly , the real MR image data obtained after bias corrected by FCM algorithm .Secondly ,we segment the real MR image data by kernel graph cuts method .Experiments show that the kernel graph cuts method with intensity inhomogeneity correction have a better segment result in accuracy and over-segmentation .
A Fast Annotation Model Based on Visual Concept Distribution
Authors: Cao Dong Lin , Lin Xian Ming , Lin Da Zhen
Published: July 2013

Image annotation is one of the important technologies in image retrieval and semantic analysis. To overcome the estimation and efficiency problem in CMRM model, we proposed a Visual Concept Distribution based annotation model which estimates the probability through the Visual Concept Set. Experiment results shows that our approach outperforms three classical annotation models (CMRM, CRM and PLSA-WORDS) and closes to the complicated PLSA-FUSION model.
Lung Parenchyma Segmentation Based on Contourlet Transform and Harris Corner Detection
Authors: Fan Li Nan , Huang He , Tian Dan
Published: July 2013

This paper presents a new automatic lung segmentation method. Harris corner detection algorithm is used to solve the problem of separating the left lung from the right one, and contourlet transform and mathematical morphology hybrid algorithm are used to solve the problem that the nodules at lung edge is easy to be missed. Through the simulation results of multiple lung CT images, compared with the common algorithms, the results show that the average sensitivity and average accuracy become much better.
Design of Test and Adjustment System for Coordinator of Infrared Seeker
Authors: He Chi , Dai Zheng Guo , Dong Guang Ling , Huang Chao Feng , Wei Hong Qiang , Zhang Ji Hua
Published: July 2013

Test and adjustment system of coordinator (T&ASC) is, virtual instrument technology based, developed. PXI measurement control platform, turntable system, target simulator and air source equipment are integrated in hardware design. Multithreading, IMAQ Vision module and DLL techniques are used in software programming. Technical difficulties as synchronous receiving of RS422 data with high speed, direct display of LVDS video image and integrated control of turntable are solved. The system achieves the integrated design of test, control and adjustment function, which can carry out overall performance tests for coordinator automatically, and execute system parameters calibrating and adjusting intelligently.
Joint Stiffness Identification and Flexibility Compensation of Articulated Industrial Robot
Authors: Feng Ya Lei , Qu Dao Kui , Xu Fang , Wang Hong Guang
Published: July 2013

Articulated robots are the most common industrial robots for their large workspace and flexibility. However, the existence of joint flexibility makes those robots difficult to achieve high absolute position accuracy. This paper presents a method to identify the joint stiffness of the robot. The basic idea of that method is to get joint stiffness based on Hooks Law through stepping movement of a single joint and calculating the corresponding joint gravity torque of every step. The practicality of that method is verified by experiment and a plan is carried out to compensate the joint flexibility.
Design of Structure and Drive System for Pneumatic Glass Curtain Wall Cleaning Robot
Authors: Tang De Dong , Cui Ming Yang , Zhang Jia Liang , Chu Jing Feng , Li Bin
Published: July 2013

In order to improve the cleaning efficiency of curtain wall, a pneumatic robot is designed. The robot is consists of mobile system, adsorption system and cleaning system. The mobile system is a cross-shaped framework that is driven by the pneumatic system and moves mutually. Vacuum sucker scheme is adopted in the adsorption system. Cleaning brush is driven directly backward and forward by the cylinder. The adsorption and detachment of robot feet sucker, body movement and sequence control of the robot cleaning task are controlled by the PLC. The function that robot can clean glass curtain wall efficiently by the harmony operation is achieved.