bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimisation of Single Edge Tools Exploitation Process
Authors: Mikolajczyk Tadeusz , Romanowski Łukasz
Published: July 2013

Paper show possibilities to optimization of exploitation process of single edge tools. It decrease cost of machining using optimizing the use of the cutting edge. This possibility was presented for single edge tools in oblique and orthogonal cutting. In oblique cutting was presented optimizing the use of the cutting edge by partially exchange of active section of the cutting edge. It is shown for straight edges. Presents model of special tool and result of made experiments, which shows possibilities to increase tool life. Second presented possibilities is orthogonal cutting with round insert. Presented results of calculations of number cutting edges from one round insert by optimizing the use of the cutting edge. For orthogonal cutting was used normal market construction tools for round inserts. Presents first results of surface roughness for tools with worn up cutting edge and rotate for exchange this worn up fragment of cutting edge. In this case number of edges cutting insert increase many times. This can many times reduce the cost of tools in cutting especially in turning.
Improving the Accuracy of Parts Manufactured by Single Point Incremental Forming
Authors: Radu Crina , Cristea Ion , Herghelegiu Eugen , Tabacu Stefan
Published: July 2013

The aim of this paper is to enrich the knowledge related to the single point incremental forming (SPIF) process by evaluating the efficiency of two optimization methods - the response surface method and the neural network method - to improve the accuracy of manufactured parts by prescribing a proper combination of the process parameters. The analysis is performed for a double frustum of pyramid made by stainless steel. It was found a good ability of prediction of both methods, demonstrating their suitability for physical implementation in solving problems associated to the SPIF process.
Mathematical Analysis of Microwave Tomography: The Reconstruction Problem of Malignant Tumor
Authors: Khalil Muhammad Hassan , Jie Li , Xu Jia Dong
Published: July 2013

Early breast cancer detection is an emerging field of research as it can save many lives infected by malignant tumors. Microwave imaging is one of the main pillars in biomedical fields of comprehensive cancer care. The mathematical theory of microwave tomography involves solving an image reconstruction problem for Maxwell’s equations. In this research contribution, we analyze the potential of an image reconstruction model for the early detection of breast tumors from microwave tomography method. The detection of early-stage tumors within the breast by microwave tomography imaging is challenged by both the moderate endogenous dielectric contrast between healthy and malignant glandular tissues and the spatial resolution available from illumination at microwave frequencies. The formulation as a shape-reconstruction problem offers several advantages compared to more traditional pixel-based schemes, to mention, in particular, well defined boundaries and the incorporation of an intrinsic regularization that reduces the dimensionality of the inverse problem whereby at the same time stabilizing the reconstruction. We present in this paper a novel strategy that can detect very small tumors compared to the wavelength used for illuminating the breast. In addition, our algorithm can determine the sizes and the dielectric properties of the tumors with good accuracy.
Analysis of Stability Asymmetries and of Gait Cycle Used to Determine the Recovery Degree for Subjects with Traumatic Locomotion Disorder
Authors: Baritz Mihaela Ioana , Cotoros Diana Laura , Cristea Luciana , Braun Barbu Christian
Published: July 2013

Traumas of locomotion system, even recovered at a great extent may change subjects’ posture and stability along time by determining an emphasis of balance or forces developed at the foot-ground contact level. In this paper we present the analysis of a subject’s case study, after a trauma in the heel area, which recovered by surgery and physical and kinetic therapy, but whose normal and/or added steps gait was changed due to the prolonged recovery time. The analysis method is based upon the information gathered from the Footscan plate sensors at the contact moment between the locomotion system (sole) and the ground. In the first part of the paper, the fundamental aspect related to the measuring of contact pressure between the human body and the ground in dynamic regime are presented, also the influence of the trunk and head posture upon this type of locomotion action. In the second part, the experimental system and the experimental development are presented, while in the final part we show the results and conclusions of this experimental research on specific case studies.
Enhanced Accuracy Navigation Solutions Realized through SINS/GPS Integrated Navigation System
Authors: Fariz Outamazirt , Ushaq Muhammad , Lin Yan , Li Fu
Published: July 2013

Strapdown Inertial Navigation Systems (SINS) displays position errors which grow with time in an unbounded manner. This degradation is due to the errors in the initialization of the inertial measurement unit, and inertial sensor imperfections such as accelerometer biases and gyroscope drifts. Improvement to this unbounded growth in errors can be made by updating the inertial navigation system solutions periodically with external position fixes, velocity fixes, attitude fixes or any combination of these fixes. The increased accuracy is obtained through external measurements updating inertial navigation system using Kalman filter algorithm. It is the basic requirement that the inertial data and data from the external aids be combined in an optimal and efficient manner. In this paper an efficient method for integration of Strapdown Inertial Navigation System (SINS), Global Positioning System (GPS) is presented using a centralized linear Kalman filter.
Sub-Pixel Measurement of the Cable Sheath Materials Thickness
Authors: Xia Shu Lan
Published: July 2013

Sub-pixel positioning is one of the key technologies which can achieve positioning better than entire pixel accuracy. The paper puts forward an improved Sobel-Zernike moment sub-pixel method based on ordinary Zernike moment method, which increase the algorithm speed while the algorithm accuracy remain basically unchanged. Then apply it to the cable sheath material thickness measurement, The experiment results indicate that the algorithm speed can be above 85% on a certain accuracy.
Optimal Distribution of Multi-Station Bearings-Only Passive Positioning System in Underwater Acoustic Engineering
Authors: Zhang Yu , Sun Da Jun , Teng Ting Ting
Published: July 2013

For the multi-station positioning system in the field of underwater acoustics engineering, different geometric layout means different location precision. The location precision of the system was analyzed. The location precisions of several typical distributions were simulated, and the optimal form of distribution was provided. The rhombus distribution and the Y distribution are two optimal distributions.
Research on the Optimization of the Numerical Value Based on Improved Genetic Algorithm
Authors: Li Zhen Dong , Zhang Qi Yi
Published: July 2013

For the lack of crossover operation, from three aspects of crossover operation , systemically proposed one kind of improved Crossover operation of Genetic Algorithms, namely used a kind of new consistent Crossover Operator and determined which two individuals to be paired for crossover based on relevance index, which can enhance the algorithms global searching ability; Based on the concentrating degree of fitness, a kind of adaptive crossover probability can guarantee the population will not fall into a local optimal result. Simulation results show that: Compared with the traditional cross-adaptive genetic Algorithms and other adaptive genetic algorithm, the new algorithms convergence velocity and global searching ability are improved greatly, the average optimal results and the rate of converging to the optimal results are better.
A Study of Seam Topography Measurement System in 3D Butt Welding of Main Steel Structure
Authors: Zhen Heng Zhou , Han Yue Mei
Published: July 2013

In 3D butt welding of main steel structure, the accuracy of arc trajectory along the centre of seam and the distance between arc and seam are critical. Thus an accurate topography measurement system is important for controlling those parameters. In this paper, a seam topography measurement system for measuring seam topography of 3D main steel structure was developed using telecentric lens, CCD camera and diode laser. A detection algorithm was developed to detect seam topography based on grey projection integral approach. Experimental study shown that the seam topography measurement system could accurately measure the seam topography, seam width and detect seam boarder. The detection algorithm was also demonstrated with high self-verification ability.
A Center Initialization Method Based on Merger of Divisions of a Data Set along Each Dimension
Authors: Chen Guang Hui
Published: July 2013

this paper proposes a hierarchical division method that divides a data set into two subsets along each dimension, and merges them into a division of the data set. Then the initial cluster centers are located in dense and separate subsets of the data set, and the means of data point in these subsets are selected as the initial cluster centers. Thus a new cluster center initialization method is developed. Experiments on real data sets show that the proposed cluster center initialization method is desirable.
Research on Multi-Target Particle PHD Tracking Algorithm Based on Multi-Parameter Assistance
Authors: Liu Yu Wen , Sheng Xiao , Qi Zhi Min , Ye Xiao Jun , Wang Shi Jie
Published: July 2013

The traditional particle PHD filter only uses kinematic characters and parameters to measure,However,when the kinematic characters of targets are similar with each other (in distance,location,speed,acceleration,etc.) the weighted measurement will become more and more similar,so the tracks of targets will be closer and closer to each other.Eventually the tracks will mingle with each other and can not be distinguished,thus causing misjudgment and failing in achieving accurate tarcking.To solve such kind of target tracking problem,this paper proposes the particle PHD filter tracking algorithm based on multi-parameter assistance.That is,the target property information and parameters will be imported into the algorithm and the measurement difference is increased by calculating the combined likelihood value of the target property parameter and the kinetic character parameter,and then the combined likelihood value is used to update the particle PHD to filter miscellaneous waves and update multi-target State collection.The simulative analysis will enable the proposed algorithm to realize the short-distance multi-traget tracking and filtering in complex environment.
Reseach on Feature Selection Algorithm Based on the Margin of Support Vector Machine
Authors: Hu Lin Fang , Qiao Lei , Huang Min De
Published: July 2013

A feature selection algorithm based on the optimal hyperplane of SVM is raised. Using the algorithm, the contribution to the classification of each feature in the candidate feature set is test, and then the feature subset with best classification ability will be selected. The algorithm is used in the recognition process of storm monomers in weather forecast, and experimental data show that the classification ability of the features can be effectively evaluated; the optimal feature subset is selected to enhance the working performance of the classifier.
Automatic Well Selection Method for Acid-Fracturing in Kazakhstan R Oilfield Carbonate Reservoir
Authors: Zhang He Wen , Zou Hong Lan , Ding Yun Hong
Published: July 2013

In order to increase success rate and production of acid-fractured wells in Kazakhstan R oilfield, this paper compared various well-selection mathematic methods. Artificial neural network was chosen as a better way to predict production rate and finally choose target wells. Besides, some problems of this algorithm, such as normalization of input data, infection of order, were optimized to make it possible to be realized. With realistic data, sample database was set up and predictable model was also gotten. Its proven that the predicted results are very close to realistic data. Also, we analyzed the sensitivity of different parameters, and some useful conclusions were given: acid-fracturing is more effective for low and medium permeability reservoirs; if each layer could be treated separately, wells with large permeability differential will be better choice for acid-fracturing; bottomhole pressure is not the higher the better.
Design of an Integrated Testing Platform for Automotive Electronic Control Units
Authors: Chen Peng Zhan
Published: July 2013

Automotive electronic control units (ECU) play an increasingly important role in modern cars. With the rapid development of ECU market, more and more ECU for vehicle appears, the ECU performance test is very important because automotive ECU closely related to the reliability and the safety of the vehicle. Starting from analyzing the characteristics of automotive electronic control unit, this article describes a generic automotive ECU testing platform, with the testing platform characteristics discussed. The proposed ECU testing platform can comply hardware testing, function testing, and communication testing, it can also reduce the test errors, and support assembly line test of ECU, which can greatly reduces the complexity of ECU functional test and test work.
Attitude Angle Measurement Method Based on the Three-Dimensional Accelerometer
Authors: Tang Yu Fa , Zhang He , Hong Li
Published: July 2013

On the basis of a study of measuring inclination angle with a two-dimensional accelerometer, a principle method using a three-dimensional accelerometer to measure attitude angle is analysed on the condition of micro-rotating. The method can reduce random systematic errors caused by uniaxial or biaxial output of the two-dimensional accelerometer. It can simultaneously measure both inclination angle and roll angle. So hardware selection, hardware circuit design and experiments are done: simulate the roll and tilt movement of the special objects and compare the solver results with the actual results. The principle method achieves preferable results, and provides a theoretical support for attitude determination of a particular industry as well.
Microwave Scan Inspection of HDPE Piping Thermal Fusion Welds for Lack of Fusion Defect
Authors: Zhu Xin Wei , Pan Jin Ping , Tan Lian Jiang
Published: July 2013

In this paper, microwave scan inspection was employed to detect the lack of fusion defect existing in the thermal fusion welds of high-density polyethylene (HDPE) piping. The thermal fusion welds without defects were firstly inspected by microwave scan technique. The obtained microwave interference pattern and the scan image produced were taken as the evaluation standard. Then the thermal fusion welds containing lack of fusion defects obtained under different welding conditions were inspected, and the corresponding scan images were recorded. The problems occurring in the welding processes that lead to lack of fusion defects in thermal fusion welds can be distinguished by analyzing the scan images. Mechanical tests were performed to confirm the effectiveness and reliability of the microwave scan method in detecting the lack of fusion defects in thermal fusion welds of HDPE piping.
Base on Real-Time Monitoring Software Integration Technology Research
Authors: Shi Hai , Zhou Chuan Hong , Xiao Jin Jie
Published: July 2013

With the rapid development of science and technology, video surveillance system has been widely used with trend of digital, networked and intelligent. Many enterprises have a lot of information management systems simultaneously, such as ERP, PLM, and MES etc., and how to solve the efficient integration between various information systems is more concerned about. This article is based on the real-time monitoring technology, studied by use of soft camera technology to build a critical enterprise information integration platform which has certain realistic meaning and practical value.
Testing of High-Resolution Analog-to-Digital Converters Using Segmentation and Optimized Low-Precision DAC
Authors: Huang Cheng , Li You Hui , Zhang Ya Dan , Wang Nan
Published: July 2013

The main challenges of high-resolution ADC testing are the huge number of samples and the expensive test equipment, especially the requirement of high linearity signal source. In this paper, the scaling and segmentation algorithm which combines SEIR with windows is introduced for high-resolution ADC test. The new approach is validated by simulation with a 24-bit sigma-delta ADC. INL error of the proposed method is ±0.2LSB, which is less than the SEIR method of ±0.5LSB,and less than the histogram method of ±0.3LSB. About 20 million samples are required in the proposed method, which is about 30 times less than the traditional histogram method.
Investigation on Non-Preheating Welding Technology of X70 Pipeline Steel
Authors: Zhang De Fen , Wang Jin , Jiang Zheng Tao , Shi Xiong , Li Zeng Zhen , Zeng Xin
Published: July 2013

Considering the mechanical properties of X70 pipeline steel after repeated welding heat cycles, preheating and interpass temperature controlling are often adopted in the welding technology, which widely increase the welding construction time and lower the construction efficiency, thus improve the construction cost of pipelines. According to the present welding process of X70 pipeline steel, non-preheating welding technology was proposed in this paper. The experiment results show that the properties of the weld joint of X70 pipeline steel with non-preheating achieves the requirement of specified standard. Furthermore, this method simplifies the welding construction processes and improves the construction efficiency. Key Words:X70 Steel; Non-Preheating; Welding Technology
Effects of Freeze-Thaw Circumstance on Stress and Displacement Filed of Tunnel Surrounding Rock
Authors: Zhang Hui Mei , Cao Hai Bo , Xie Xiang Miao
Published: July 2013

The stability of tunnel surrounding rock is a key scientific issue in the design and construction of the tunnel engineering. Taking the load pattern of incremental form, the distribution law of stress and displacement field of the Osaka mountain tunnel after excavation was calculated based on the D-P yield criterion; Basing on the comprehensive heat and mass transfer theory, the temperature field in the surrounding rock was calculated and the variation of stress and displacement field after the surrounding rock experiencing the free-thaw cycles. All of the results can provide some references for the design and safe construction of the tunnel engineering under the action of freeze-thaw environment in cold regions.
The Influence on the Organic Electroluminescent Device Performance with Different DPAVBi Position
Authors: Zhang Gang , Jiang Wen Long
Published: July 2013

We studied the influence on the organic electroluminescent device performance with different DPAVBi position. When DPAVBi was the separate blue light emitting layer and its thickness was 20 nm, the performance of the device is better than others. The yellow light device performance with DPAVBi behind the Rubrene layer is better than the device with it in front of Rubrene layer. The device has a maximum luminous 23560 cd/m2 at 17V and maximum efficiency 6.63cd/A at 16 V. We have received the blue-green light device with the Rubrene doped to DPAVBi. The maximum efficiency is 5.37 cd/A at 9 v and the maximum luminance is 6377 cd/m2 at 16 V. The efficiency drops slowly when the voltage increases. So, all the devices have the current weak fluorescence quenching.
Effect on Sedimentation Characteristics of Bentonite Suspension at Different Conditions
Authors: Jiang Lin Ling , Mo Wei , Yang Xiao Jing , Xue Tian Li , Ma Shao Jian
Published: July 2013

To better understand the sedimentation processes of bentonite, the sedimentation characteristic of bentonite suspension was studied by using the sedimentation analysis module of Dynamic Contact Angle Meter and Tensiometer. The results indicated that sedimentation characteristics of bentonite suspension were affected by the concentration and pH values of the suspension together with the dosage of dispersants. The natural sedimentation rates of bentonite suspension declined firstly with prolonging the sedimentation time and soon stabilized after about 50s. The sedimentation weight of particles hardly changed when the concentration ranged from 0.5% to 5.0%, while it increased significantly when ranged from 5.0% to 10.0%. The sedimentation weight and rate were relatively bigger at 4.4, 11.8 than that of 6.0, 7.9, and the maximum values appeared at pH11.8. Adding sodium pyrophosphate could improve the dispersibility of bentonite suspension.
Experimental Study on Loading Accuracy of a Disc Brake
Authors: Meng Qing Rui , Wang Dao Ming , Song Bao Cheng
Published: July 2013

In order to improve the loading accuracy of a disc brake used as loading device, we have developed an experimental equipment and carried out a number of experiments, the influencing factors of loading accuracy are analyzed experimentally and theoretically. The results show that 1) the disc brake can meet the requirements of the load simulation and be used in practical application; 2) it is the geometric axis tilt that causes the torque fluctuations. It indicates that more attention should be paid to the geometric axis of the brake disc to minimize the installation errors and improve the loading accuracy. Research findings of this paper provides theoretical and experimental basis for the practical applications of the disc brake used as a loading device.
The Analysis of Galloping-Endurance Character of 500kV Power Transmission Tower
Authors: Yang Xiao Hui , Zhang Bo , Lou Wen Juan , Fu Zheng Cai
Published: July 2013

With transmission line galloping occurring frequently in recent years, the phenomenon of tower damaged by galloping has become more and more serious, even with the whole tower collapsed during galloping. According to the statistic and analysis on the towers in 500kV transmission line of Henan power grid, which had been damaged by the galloping accidents in the winter of 2009 to 2010, The galloping section of 500kV Kai-Xiang Line with the typical impaired character had been selected for laboratory modeling and test. Through a series of tests, the maximum loading position and the vibration model for tower had been found, and the changing character of towers dynamic response with ice thickness, galloping amplitude and frequency analyzed. The loading-endurance character of rod and bolts joint, as the major components of tower, had been tested and analyzed respectively. The bolts joints, had been proved as the weakest point for galloping-endurance performance of the whole tower. The study stated in this paper would provide guidance and suggestion to the alteration on galloping prevention and controlling for transmission line. It was also shown that, developing the study on the locking performance of bolts joints on tower is quite essential.
Study on Dynamic Response of Cylindrical Shells under Combined Load
Authors: Han Xue Feng , Wang Yan Dong , Wang Tao , Ding Tong Chao , Jia Hong Guang
Published: July 2013

In order to study the dynamic response of the cylindrical shell structure which is similar to the missile cabin under the combined effects of axial compressive load and radial aerodynamic load, the equilibrium equation of dynamic response of cylindrical shell is derived based on the Hamiltons principle. The displacement response of cylindrical shell is calculated through employing the numerical method. The calculation results show that the axial displacement response and the radial displacement response of cylindrical shell are much greater than the circumferential displacement response; the radial displacement will be maximum when the excitation frequencies are 285Hz, 594Hz, 1039Hz, 1062Hz, 1093Hz, 1962Hz and 1987Hz; the axial displacement will be maximum when the corresponding excitation frequencies are 81Hz and 294Hz; the peak values of displacement response in non-load plane are not all obtained at the resonance frequency and a certain effect is generated due to the modal coupling.
E-Learning Exploration Based on Cloud Computing
Authors: Wang An , Huang Le Hui
Published: July 2013

Cloud computing is a new proposed computing model based on grid computing and the core technology of next generation network platform. It provides reliable and secure data storage, convenient web services and strong capability of calculation. In education, cloud computing will be the fundamental environment and platform of future network learning. It will have positive effect in building good learning environment, integration of resources and other aspects of e-learning.
Study on System Design of Coal Mine Underground Permanent Refuge Chamber
Authors: Miao Lei Gang , Niu Yuan Yuan , Zhang Kui
Published: July 2013

This paper introduces the function and meaning of permanent refuge cavern construction of coal mine. According to the composition of the permanent refuge cavern system, functions of other subsystems, construction site, daily maintenance and harmonious and unified of each system operation, design and study of the system have been introduced in this paper. Focus on the analysis of the specific characteristics of each subsystem and the contents of each subsystem required quantization, provide the basis for the design and construction of coal mine permanent refuge chamber.
Signal Generator Design Based on the FPGA
Authors: Zhou Deng Rong , Zhou Yu Rong , Gong Jian Chun , Mao Zhong Fa
Published: July 2013

this paper introduces an output method of arbitrary waveform signal on the FPGA by uses DDS principle. Arbitrary waveform dates produced by the upper machine are downloaded to the waveform RAM of the DDS through the serial port, and realize the control of frequency and phase by using single-chip microcomputer. The upper machine with using LabWindows/CVI software design, realizes arbitrary waveform output.
Error Analysis and Calibration of Infra-Red Temperature Measurement
Authors: Bao Ke Qin , Ding Gu Xiang , Song Yi Bo
Published: July 2013

R temperature measurement in electrical equipment is more and more used in temperature measurement, but accuracy of temperature measurement is susceptible to outside interference. The main factors affecting the accuracy of measuring temperature, such as environmental factors, equipment emissivity and distance coefficient, are analyzed, the solution has been put forward. In the environmental conditions under the condition of relatively unchanged ,change rule of the temperature value along with the temperature measuring distance changing from 0.7 to 5 meters is found, and temperature value is calibrated . The result after calibrating shows that the method is valid,and error of temperature is less than 0.7°C within 5 meters.
Research on Dust Concentration Measurement Technique and Experiment Based on Charge Induction
Authors: Zheng Kai , Wang Jin Gang , Liu Jing , Xiong Shuang Ka
Published: July 2013

In order to solve the problem of monitoring dust concentration, the paper applies the charge induction method in the design of the monitoring sensor. Specifically, the dust concentration can be characterized by the induction voltage of the sensor which is located in the high-voltage alternating electric field. In particular, the paper introduces the structure of the sensor and analyses the basic principles and feasibility of the measuring equipment. Furthermore, couples of simulation test is conducted based on the test platform. According to the test results, the monitoring sensor performs well when the dust concentration is between 0.81g/m3 and 1.99g/m3, in which the maximum measurement error is only 1.8%. Undoubtedly, the method used for the dust concentration monitoring has a wide prospect in industrial application.
Test Methods for Measuring Mechanical Parameter of Simulated Lunar Dust
Authors: Li Man , Tian Dong Bo , Wang Zhi Hao , Bai Yu , Zheng Hui Qi , Tong Jing Yu
Published: July 2013

Due to the preciousness of real lunar dust, the lunar dust simulant is usually employed to replace the real one in the large numbers of experimental investigations about its mechanical property and engineering property. Therefore, the investigation on mechanical property of lunar dust simulant is also extremely significant. This research has put forward several methods for measuring mechanical property, which are used to measure the parameters including particle size distribution, particle proportion, relative density, void ratio, cohesion, internal friction angle, etc. of lunar dust simulant. The lunar dust simulant is determined to be suitable for application in the moon exploration project experiment after comparing these parameters with relevant typical mechanical parameters of foreign lunar dust simulant.
Synchronization Design for Multi-Channel Data Acquisition System
Authors: An Jian Fei , Song Ke Zhu , Shang Lin Feng , Yang Jun Feng
Published: July 2013

In land seismic data acquisition systems, as seismic exploration goes towards to cover large area, a multi-channel structure is needed. In such systems, synchronization is very important, which has great influence on data acquisition and transmission. In this paper, a clock synchronization scheme for seismic exploration is proposed. In the scheme, LVDS serial transmission is used so that the whole system clocks can be made to have the same frequency through clock data recovery technique. Moreover, to compensate the effect caused by transmission delay, an effective algorithm based on PLL phase locked and FPGA logic is proposed in this scheme. The test results show that this scheme meets the system clock synchronization requirements well with the error precision less than 1ns, which fully demonstrates the feasibility and reliability of the scheme. The scheme proposed here can be used in related systems which require clock synchronization.
Research and Design about a System of Harmonic Detection Based on ARM and HHT
Authors: Yang Hua , Wu Jun , Cheng Lei Meng
Published: July 2013

As we all know FFT(Fast Fourier Transform) can be used analyze and calculate linear and stationary signals, while signals in reality are always nonlinear and transient, so we use HHT(Hilbert-Huang Transform) to detect them. In the past,scholars detect harmonics by applying ARM accompany with FFT. In this article, we use the development board S3C6410-as hardware platform. our processor is ARM, while the main algorithm is HHT.
Design of a Signal Processing System for Digital Laser Altimeter
Authors: Zhang Yi Fei , Yang Hui
Published: July 2013

Laser altimeters are used to measure the elevation and detect the topography of terrain, which have been widely applied in military and civilian field. In the course of measurement, errors will inevitably generate as a result of ground settlement, surface relief and tilt, etc. In order to reduce measurement errors, the technology of laser waveform digitalization was researched. Firstly, the principle of error generation was introduced. Secondly, the basic scheme of signal processing system for digital laser altimeter was present. System components and signal processing procedure were researched. Next, the technology of extracting echo waveform parameters was discussed. Finally the method of using digital waveform parameters to correct measurement errors was provided. The principle of target classification and identification based on echo waveform parameters was introduced also.
Research of Denoising Technology about Wavelet Analysis with Wiener Filter
Authors: Hu Yao Bin , Hu Liang Bin , Cheng Qiang
Published: July 2013

Interfering noise of power line is one of the important factors which affects the quality of power line communication (PLC). Its frequency spectrum has the character of the 1/f process and the great autocorrelation. The wavelet analysis is an important signal-processing tool. Selecting suitable wavelet analysis can turn non-white noise to white noise, followed by wiener filtering, we can achieve the purpose of denoising. This paper introduces a denoising method of combining wavelet analysis with wiener filtering. Experiment proves this method has a strong feasibility and practical value.
Anti-Ship Missile Target Selection Method Based on the Target RCS Information
Authors: Dan Bo , Jiang Yong Hua , Li Jing Jun
Published: July 2013

To improve anti-ship missiles selection capability over the intended target of the ship formation, a method is presented to select intended target by utilizing the mutual locations and RCS information of the ship formation. Firstly, this method takes advantage of the hausdorff distance to match the optimum position of the point set which are respectively acquired by fire-control radar and terminal guidance radar. Then, the point sets common points are acquired by the bidirectional nearest neighbor rule. At last, the common points are further selected by utilizing the RCS information of the target. The composite metric distance method is presented by utilizing the targets RCS information and the formation information, and the selection probability of the intended target is analyzed. The simulation experiments show that this method is free from the influence of the dispersion error of the control end and the whole maneuver of the formation target, and its correct selection probability over the intended target is higher than the method which uses the formation information only.
Reconfigurable Measurement Method Based on Mobile Internet
Authors: Zhang Deng Pan , Song Peng Fei , Gao Zhi Qiang
Published: July 2013

With the maturity of mobile Internet technology, the mobile terminal performance improves continually. Real-time and mobility in measurement system will become an inevitable trend . To solve the poor generality and mobility problem of traditional measurement system,this paper will combine reconfigurable virtual instrument technology and mobile Internet technology, develop a set of reconfigurable measurement instrument platform to adapt to the mobile devices (mobile phones, tablet PCs, etc) characteristic by using Eclipse software, which enable the wireless interactive operation and measurement data real-time detection, meet the demand of various measurement tasks as well as enhance the system scalability. At last, through building measurement instrument platform of wireless weighing to realize the instrument system online reconstruction.
A Sufficient Condition of Shearlet Frame with Several Generators
Authors: Liu Ying , Hao Xiang Hui
Published: July 2013

The shearlet plays an important role in image processing because it can provide optimally space representations for higher functions. In the note, a sufficient condition for irregular shearlet frames with several generators is presented. This generalizes the existing result to the case of several generators.
A Novel Rate Control Algorithm for H.264/AVC Standard
Authors: He Shu Qian , Shi Chun , Deng Zheng Jie
Published: July 2013

In this paper, we describe our rate distortion optimization framework for H.264/AVC standard. We investigate that the R-D characteristics of H.264 video signal in traditional transform-based video coding systems should be modeled for the Texture and Header components separately. Based on the proposed model, a R-D cost estimation function is also proposed to give a more accurate R-Q model. Built upon the above ideas, a rate control (RC) algorithm is developed for the H.264 encoder under the constant bit rate constraint. It is shown by experimental results that the new scheme can achieve better results in control bit rate and R-D performance compared to previously proposed approaches.
The Research on Mobile Video Quality Analysis and Evaluation System for TD Network
Authors: Jiang Dan , Zhang Xin Chen , Liang Mei Yan
Published: July 2013

Nowadays, mobile WEB video application got rapid development, and the video service quality evaluation and the analysis of the network performance have become an urgent demand. In this paper, we propose a new framework and method to assess the subjective quality of mobile web video based on no-reference (NR) model. Through discuss the structure of TD mobile network and the application of web video, the paper built a set of testing process for mobile video on demand service and fault location method based on the result of network structure and the business of video quality evaluation. The actual test results from TD network shows the proposed way can measure the web video quality and find the bottleneck location of the transmitting network. The evaluation result of video on demand quality is in accordance with the subjective feeling of the user. The benchmark contrast testing method proved to be practical and feasible in the real test, thus providing readily available tools for video service quality assessment.
Research on Safety Vehicle Distance Recognition Based on Stereo Vision and DSP
Authors: Chen Rong Bao , Li Ning , Xiao Hua Feng , Hou Wei
Published: July 2013

With the development of economy, there are an increasing number of cars as well as traffic accidents, thus intensifying the need to take measures to reduce traffic accidents and protect the safety of life and property. Vehicle distance is one of the most important indexes of traffic safety. The measurement of safety vehicle distance has become an increasingly hot research area of intelligent transportation. Through analyzing the basic principle of stereo vision and calibrating the parameters of the CCD sensors both inside and outside, this paper comes up with a method to measure the former vehicle distance based on stereo vision and DSP. Once the vehicle speed and distance form a non-security association, it will give a warning, and upload data or force speed-limiting. According to the different coordinates of the obtained images of the target vehicle from the left and the right sensor, this method can identify feature points, calculate distance to the target vehicle, and analyze the security of vehicle distance. The experimental results show that this method has wide measurement range, high measurement accuracy, and fast operation rate, thus it can meet the actual needs of the measurement of safe vehicle distance in intelligent transportation.
Textile Image Retrieval Using Composite Feature Vectors of Color and Wavelet Transformed Textural Property
Authors: Chun Jun Chul , Kim Wong Gi
Published: July 2013

It is known that wavelet transform provides very useful feature values in analyzing various types of images. This paper presents a novel approach for content-based textile image retrieval which uses composite feature vectors of low-level color feature from spatial domain and second-order statistic features from wavelet-transformed sub-band coefficients. Even though color histogram itself is efficient and most used signature for CBIR, it is unable to carry local spatial information of pixel and generate inaccurate retrieval results especially in large image data set. In this paper, we extract texture features such as contrast, homogeneity, ASM(angular-second momentum) and entropy from decomposed sub-band images by wavelet transform and utilize these multiple feature vector to retrieve textile images combining with color histogram. From the experimental results it is proven that the proposed approach is efficiently retrieve the desired images from a large set of textile image database.
Study of Digital Character Recognition Based on BP Neural Networks
Authors: Yuan Shuai , Zhang Guo Yun , Wu Jian Hui , Guo Long Yuan
Published: July 2013

A digital character recognition method is presented based on BP Neural Network. This paper preprocesses the digital character image and extracts character feature, then uses BP Neural Network to recognize digital character. Back Propagation algorithm seeks network weights to minimize training error in the solution space. A network with hidden layer is created at first, then an input sample vector is sent to network input terminal and the square error E between output values and training sample object output values is calculated. Above process is repeated for input samples of training sets until the error is reduced within the limits of the threshold. The results show that the method presented has good accuracy, quick speed and strong robustness for realtime application.
Segmentation of Coronary CT Angiography Images Based on Deformable Model with New Edge Measures
Authors: Tang Xiu Juan , Zhou Shou Jun , Hu Qing Mao
Published: July 2013

To deal with locally narrow, low-contrast and spatially varying intensity in segmentation of the computed tomography angiographic (CTA) data, a deformable model with newly proposed edge measures was presented for segmenting coronary arteries. The edge measures were derived from the refined vesselness measures of brightness and multi-scale filtering responses, i.e., vesselness and scale. The initial vessel region and boundary region was derived from the multi-scale filtering responses, from which the statistical information of vessel appearance was attained to yield brightness measure. As compared with the multi-scale filtering responses, the refined vesselness measures could effectively suppress non-vascular background while preserving vessel-like structure. Finally, the new edge measures were embedded into deformable model, resulting in better artery segmentation.
Controlling Length Deformation Caused by Elevation According to Coordinate Transformation
Authors: Ning Dian Min
Published: July 2013

Because of the influence of elevation, Surface observation distance and reference ellipsoid distance is not equal, Resulting in length deformation, The size of the deformation is caused by elevation, In order to meet the requirements of measurement accuracy, It must be controlled within a certain range. In this paper, through establishing measuring reference, realized coordinates transformation in the national reference, it is very effective to control length deformation which is caused by elevation, at the same time, The relative position of survey area is unchanged in the national coordinate system
Study on Detection of Preceding Vehicles Based on Computer Vision
Authors: He Peng , Gao Feng
Published: July 2013

Detection of preceding vehicles is a critical step in automotive driver assistance systems aiming to alert a driver about driving environments and possible collision with other vehicles. This paper developed an algorithm of detecting preceding vehicles based on computer vision, which exploits synthetically the vertical edge, shadow underneath vehicle, horizontal edge and symmetry features. The experimental results indicate that this algorithm is effective and precise.
On Obstacle Avoidance of Multiple Ultrasonic Sensors Based on Aloha Robot
Authors: Zhao Xiu Xia , Wang Hai Xia , Lu Xiao
Published: July 2013

A single ultrasonic sensor can only measure narrow range and mistakes can happen in the process of gathering information. Multiple ultrasonic sensors applied in intelligent robot, can make up for this defect and obtain reliable and accurate environmental information. So in this paper, aloha robot is taken as the research object, and multiple ultrasonic sensors are installed in the interior of aloha robot for the environmental obstacle information, then aloha robot control the rotation speed of maxon DC motor so as to move forward or backward, and turn left or right.
Research on Switch Linearity Hybrid Power Converter
Authors: Hu Wen Hua
Published: July 2013

This paper introduced a voltage follower type of supply hybridized by the switch filter unit with the linear unit, analyzed the principle of the composing, the topology of Switch Linearity Hybrid (SLH) power converter. Theory analyses, simulation and experimental results showed that the SLH power converter possess the character of high efficiency, low THD, the capacity suitable to varied kinds of loads (including non-linear load) and resisting load disturbance.
Voltage Stability Analysis of Wind Power Integrated System Based on Flexible HVDC
Authors: Meng Ling Long , Tang Zhen Ning , Zhang Dao Nong , Ji Jie , Zhang Jian Hua
Published: July 2013

With the scale of integration of wind power increases gradually, the voltage stability and the fluctuation problem of the system caused by integration have become more and more prominent. Traditional AC power transmission mode cannot alleviate the adverse effects of integration of wind power, Flexible DC power transmission has many advantages due to the use of voltage source converters self-commutated characteristics, Flexible DC power provides a new technical method and also provides a solution for the integration. This paper introduces the basic structure and the basic control principle of Flexible DC power transmission technology. Then, through comparing the transient stability level and voltage supporting ability of AC power transmission with that of Flexible DC power transmission, an isolated system is used as an example to elaborate the beneficial contribution that the new integration of wind power make to the voltage stability, which indicates that Flexible DC power transmission technology has broad application prospect in the transmission area of wind power, and gives very good reference value for the Flexible DC power used in integration in the future.
Dynamic Modeling and Simulation of a Novel Wall-Climbing Robot
Authors: Dong Wei Guang , Wang Hong Guang , Jiang Yong
Published: July 2013

The dynamic modeling and simulation of a novel wall-climbing robot is presented. For the novel biped-wheel hybrid locomotion mechanism of the robot, its locomotion modes and typical state of motion are analyzed. Based on the description of the robots pose, the dynamic model for two typical states of motion, point turning in a flat surface and transition between two intersecting surfaces, is established. The equation for calculating adhesion force when the robot moves on arbitrary inclined surfaces is derived from the dynamic model. Simulations for the adhesion force are implemented with three typical examples. The results show that the tilt angle of the attachment surface and the motion direction of the robot have great influence on the adhesion force.
Environmental Automatic Control System of HMG-2 Type Solar Greenhouse
Authors: Chen Guo Hui , Guo Yan Ling , Qu Fang
Published: July 2013

In present, plenty of solar greenhouse in northern China can't play maximum efficicency because of have no environmental control system. Through greenhouse construction for many years, a new practical HMG-2 type solar greenhouse with environmental automatic control system has been developped. This control system has "offline" and "online" two kind of working modes. The paper expounds the key technology adopted by the control system, which can greatly improve production performance of solar greenhouse. This environmental control system has many advantages such as low cost and easily to implement. It can meet the demand of users and has popularization value.
A QNX-Based Hardware and Software Platform for UAV Control
Authors: Shan Ya Feng , Cheng Nong , Mu Chun Di
Published: July 2013

UAVs (unmanned aerial vehicle) can be widely used in military, research, industrial, agriculturaland other fields. This paper presents an onboard flight computer which can be applied toUAVs of various layouts including helicopters, fixed-wing aeroplanes and tailless aircrafts. We alsodeveloped a semi-physical simulation and actual flight software system based on QNX (a kind of realtimeoperating systems). This platform provides interfaces with MATLAB RTW generated code foreasy design and verification. The platform is used to control the autonomous take-off and landing ofa fixed-wing UAV, its stability and reliability are verified.