bluuebunny/crossref_metadata_2025 huggingface dataset:
A 14-Bit Pipeline ADC Behavior Model Using Verilog-A for SOC
Authors: Liao Wang , Lei Lang Cheng , Zhou Xiao Dan
Published: September 2014

This paper presents the advantage of behavior model. This is useful for the SOC fast verification. A 14 bit pipeline ADC is constructed with simulation of behavior model and the noise model. A comparison of result is illustrated, between the ideal 14 bit ADC behavior model and the 14 bit pipeline ADC with non-idealities.
The Application Research of Current Protection Device in Low-Voltage Rural Grid
Authors: Wang Lin Yuan
Published: September 2014

Current protective device against direct and indirect electric shock as well as effective protection against electrical fires has been widely used in the rural power grid, but there is also a more prominent issue. Residual current protection device in use often appearing malfunction, tripping phenomenon has seriously affected the security and stability and reliability of power supply and low voltage distribution systems. In this paper, it should be from a low-voltage distribution systems and wiring protection devices, power grid maintenance operation, standardized management products, technical training and promotion of social workers and other aspects of a comprehensive solution to this problem; and presented on the remaining current protection device applications, some of the views.
Design of the Embedded PLC Hardware System Based on CAN Bus and LCD Touch Screen
Authors: Xin Hai Yan , Li Cheng Xiang , Lu Qing Ru , Huang Hui
Published: September 2014

Design of the embedded PLC hardware system Based on CAN bus and LCD touch screen,the system is low cost,reliable operation,can meet the demand of personalized society.
Design and Implementation of ARM-Based Intelligent Switchgear Control System
Authors: Liu Jia , Diao Jie Tao , Zhu Ce , Xing Jin Ling , Wang Jing Long , Li Nan
Published: September 2014

With the current domestic and international research and development technology, a new intelligent low-voltage switchgear control system is realized by ARM-based, with highly integrated, low-cost hardware and software design.The paper introduced the overall process of hardware design and software design. The system has been proved that the ability to realize the low-voltage distribution system monitoring and management, with open and close, open circuit detection, temperature and humidity measurement and control functions and intelligent, digital, low power consumption, and interference characteristics.
Single-Element Passive Quenching with Active Reset Circuit for Single Photon Avalanche Diodes
Authors: Hu Chong , Ju Teh Hua , Yao Yong
Published: September 2014

A single-element passive quenching with active reset (PQAR) circuit is proposed. Its operation mechanism is studied in theory to show that this single element, based on thyristor, can provide similar function of quenching and reset for the free-running Geiger-mode operation of single photon avalanche diodes (SPADs) as the conventional PQAR circuits, but with significant simplicity. Requirement for the thyristor is identified, and an InP sample was designed, fabricated and characterized. Future work for further demonstration is also discussed.
A Wilkinson Power Divider Using a Microstrip in Isolation
Authors: Wang Yong , Zhou Shun Li , Qiu Yong Sheng
Published: September 2014

This do In this paper, based on the Wilkinson power divider, a modified Wilkinson power divider using a microstrip in isolation is discussed. It can reduces the size of the circuit board area. What’s more, the isolation bandwidth can be extend by the Wilkinson power divider using a microstrip in isolation. Firstly, this paper illustrates the principles of the traditional Wilkinson power divider. By introducing the concept of isolation network, the real and imaginary part of the traditional Wilkinson power divider are derived. And then, the principle diagram the Wilkinson power divider with RLC isolation network are shown, we also give the expression of the real part and imaginary part of the isolation network. Lastly, we introduce the modified Wilkinson power divider using a microstrip in isolation, and give the expressions of real part and imaginary part of the isolation network, and the above three kinds of real part and imaginary part of Wilkinson power divider are simulated. Through simulation, we found the power divider using a microstrip in isolation has better physical performance.
Design of a Multichannel High Precision Instrument in Portable Data Acquisition
Authors: Dong Ai Hua , Kang Xiao Yan , Wang Yun Yi
Published: September 2014

For the need of multi-channel simultaneous sampling in the modeling and identification of power system, a portable data acquisition system is introduced. It can sample multi-channel data simultaneously, and also have a mass data storage. The system is composed of data acquisition card and PC processing software. The C8051F410 MCU is the core of the data acquisition unit card. It not only provides multi-channel synchronous sampling, large storage capacity, easy to carry and low cost, but also can run offline, and bidirectional interaction with PC software. The data processing software is programmed by Visual Basic6.0. Its main function is sending sample orders and the sample data processing. It can store and process the sample data, also it can set the sampling parameters of the card. Through actual verification, the system is easy to use and meets the precision of requirement.
Study on Fault Diagnosis of Ship Power System Based on Multi-Source Information Fusion Technology
Authors: Liu Lei , Li Xiu Qiang
Published: September 2014

This paper firstly establishes a mathematical model of ship power system, and then analyzes the characteristics and common faults of ship power system. D-S evidence theory method is used on research of common faults of the ship power system, to enhance the pertinence of fault diagnosis. By using multi-source information fusion diagnosis, the need for quantities of electrical data is reduced, and, it can effectively reduce the impact of protection or switch malfunction on the fault diagnosis of ship power system and thus improve the accuracy of diagnosis.
Numerical Simulation of Cathodic Protection Potential Distribution of Coastal Power Plant Condenser Based on Physical Scale Model
Authors: Zhang Peng , Zhao Juan , Wang Gui
Published: September 2014

Finite element numerical simulation software was used for numerical simulation analysis of cathodic protection of coastal power plant condenser based on physical scale model. The effects of location, size and number of auxiliary anode on the cathodic protection potential distribution of the condenser were studied, which would predict cathodic protection result of the condenser and provide reasonable design for cathodic protection of the condenser.
Design and Implementation of Multi Tone Modulation System Based on Sound Card
Authors: Ren Dan
Published: September 2014

A multi tone modulation system design and development with a low-cost and high performance was developed, taking LabVIEW as the software development platform and the computer sound card as the hardware platform. The system is capable of audio signal acquisition, multi tone modulation, demodulation, waveform and spectrum analysis, and other functions. Actual application shows that the system is not only high accuracy, and reliable, stable performance, easy to operate and extensions. The signal collection technology based on the sound card and the combination of virtual instrument has a broad application prospect in engineering survey and practical teaching.
Estimating the Magnetization Direction of Sources through Correlation between Reduced-to-Pole Anomaly and Normalized Source Strength
Authors: Guo Liang Hui , Gao Rui , Zhang Guo Li
Published: September 2014

Under the effects of remanent magnetization, total magnetization direction is different from geomagnetic field direction, which makes magnetic data processing and interpretation complexity. In this paper, we present a new approach for estimating the total magnetization direction of sources via cross-correlation between the reduced-to-pole anomaly and the normalized source strength (who is less sensitive to remanent magnetization). The geomagnetic field direction is used to calculated the normalized source strength, while various assumed total magnetization directions are used to calculated the RTP anomalies. The maximum correlation between the RTP anomalies and the normalized corresponds to the estimated total magnetization direction. Test on synthetic data showed that the new approach is simple and effective.
Research and Implementation of LCD Writing Board Based on MSP430 Microcomputer
Authors: Liu Guo Liang , Zhang Cai Rong , Wei Bin , Ge Jing , Hong Qi Ming
Published: September 2014

As a digital input device, the current LCD writing board is widely used. Taking the MSP4 microcomputer with 16 bits bus and FLASH memory as the core, a high-resolution PCB coordinate positioning system is designed and fabricated. The simple handwriting input device is fabricated with the PCB common copper clad laminate of 10*15cm. Due to its material, such input device can form a small resistance array, so it will involve a problem about how to select the measurement methods of the small resistance. Through many repeat tests of various experimental schemes and the high-precision A/D sampling, the voltage signal transmit from the resistance through the instrument transporting and filtering is indicated on the LCD12864. And through certain approximate algorithm and data processing, the contact coordinates of the digitizer pen can be indicated in real time, and you can also draw simple graphics through the system. In addition, the system is characterized by high resolution and low power consumption.
Study on Friction Compensation for Shipborne Tracking Antenna Servo System
Authors: Zhu Dong Xu , Jia Yun Xiang , Feng Yue
Published: September 2014

First, a certain type of ship azimuth servo system as an example, mathematical model with friction is established, then using LADRC to estimate and compensate the friction disturbance, greatly inhibit the effects of these disturbances on the servo system. The simulation results show that the method of ADRC can greatly improves system capacity and anti-friction disturbance.
Friction Compensation for Shipborne Tracking Antenna Servo System Based on LADRC
Authors: Zhu Dong Xu , Chen Xi , Sun Lin Fei
Published: September 2014

Aimed at rejecting the bad effect of friction for Ship-borne Servo Control System, the position loop ADRC(LADRC) is designed. The simulation results show that the method of ADRC active immunity, which greatly improves system capacity and anti-friction disturbance which has tracking accuracy and fast response, simple parameter adjustment, can get good control performance for a certain type of ship control servo system.
Designing a Parallel Switch Simulator Based on OpenMP
Authors: Wang Ying , Fang Zhi Yi , Zhang Hao , Liu Ang
Published: September 2014

‘SIM’ is the abstraction of ATM Switching Architecture Simulator which is developed by Stanford University based on time-slot. It’s produced to simulate ATM network. With the SIM, users can simulate the ATM switchboard in accordance with their needs on Linux platform. Multi-core CPU programming technology enable programs parallelized and achieve high improvement on performance. Therefore we bring this idea to develop a parallelized switch simulator called PSIM in this paper.
Research on the Design of Drawer-Type Power Module Based 10kV Outdoor Intensive SVG
Authors: Zhang Lin , Zheng Nan , Wang Yuan Hang , Jiao Ming Hang , Liu Shu Ze , Li Gang , Xing Yun , Song Bo
Published: September 2014

Recently, static var generator has been widely applied to substations all over China, mainly adopting indoor mounting and outdoor box-type substation (or color plate housing) mounting. As SVG is popularized, people gradually find out that the current mounting ways are not suitable for the actual environment of many substations (especially rural power grid). Large land coverage, big overall loss and complex maintenance have become the main factors that restrain further popularization of SVG. A new SVG structure is proposed. SVG body and mounting are combined, applied to a rural power grid substation successfully. Compared with ordinary SVG, it features small land coverage, reduced loss and maintenance quantity and higher stability.
Research on Chain SVG Direct Current Control Simulation Based on PSCAD
Authors: Liu Cun Guo , Hao Hui , Zhang Zhi Qiang , Wang Xin Hua , Li Xiao Le , Wang Shu Han , Wang Ji Hao , Chen Jia Yong
Published: September 2014

SVG is a device parallel on the power grid for dynamic reactive power compensation, is a product of best performance and mature technology in the third generation dynamic reactive compensation technology so far. Thanks to power unit module series structure and PWM technology, compared with multiple SVG, chain SVG has high capacity, low loss, simple maintenance. But more complicated in control, indirect current control technology and direct current control technology are adopted. This paper utilizes PSCAD simulation software to build a chain SVG direct current controller model according to mathematical model of the chain SVG, simulates SVG compensation with inductive load and capacitive load, so as to verify advantages of fast tracking speed and stable control of direct current controller.
Design and Realization of Semaphore for a Sensor Network Operating System
Authors: Zhou Yan , Li Hai Cheng
Published: September 2014

μOS, the operating system of microkernel wireless sensor network, is a real-time multi-tasking operating system; the author designs a semaphore synchronization mechanism and works out mutex semaphore in the paper, in order to avoid errors resulting from resources sharing by multiple tasks in a competitive manner. It is shown from experiments that the mechanism is capable of synchronizing and multi-excluding in μOS more effectively, thus optimizing kernel synchronization and mutex in a simpler and more efficient manner.
Study on Fault Diagnosis of Wind Turbine Generator Based on HHT
Authors: Wu Rui , Zuo Xing Yong , Jia Hai Tao
Published: September 2014

The rapid development of wind power generator, the service life and efficiency but various fault often will not only shorten the wind generator, also brought the loss of life and property to the people. For fault diagnosis is an effective method of fault diagnosis using the motor vibration signals, This paper adopts the HHT analysis method, the vibration signal of the wind machine for processing fault characteristics are obtained, and the fault diagnosis,improve the efficiency of fault diagnosis, the conclusion shows that it is an effective method of fault diagnosis for fan, troubleshooting and repair of fans have important practical significance.
Research on Blind Source Separation with Noise Based on Multi Factor Analysis
Authors: Liu Guo Hua , Yin Zeng Shan , Wang Zheng Wei , Yao Xiao Song , Yang Wen Zhe
Published: September 2014

The pre-processing method of blind source separation based on multifactor analysis is proposed to solve the blind source with noise. Firstly, the shortcomings of existing methods of blind source separation are point out after analyzing their principles. The multifactor analysis is introduced in blind source separation and the maximum likelihood estimate based on expectation maximum is used to estimate the common factor and random error. Finally the FastICA algorithm is used to separate BSS result. The validity and the advantage of this method are illustrated by an example.
Controllable Four-Wave Mixing Signal inside a Cascade Three-Level Atomic System
Authors: Zhang Yun Zhe , Fa Li Bo , Gao Hui Peng , Wang Yun Long , Wang Yin , Wang Dan , Li Yuan Yuan
Published: September 2014

We experimentally report that electromagnetically induced transparency (EIT) in the nonlinear propagation of probe beam, four-wave mixing (FWM) images and in a cascade three-level atomic systems. It is shown that by changing the frequency between pumping fields or dressing fields, respectively, the properties of the measured signals including the intensity and spatial images are affected greatly, including the electromagnetically induced transparency (EIT), Aulter-Townes splitting. By changing the laser frequency we can control the four wave signal, Moreover, the AT splitting effect due to spontaneous emission was also observed under EIT conditions..
Kalman Filter Processing Applications for Motion Noise
Authors: Zhang Xing Dong , Meng Xiao Hong , Guo Liang Hui
Published: September 2014

In geophysics exploration, using gradient tensor instead of the full magnetic field gradient has many advantages, which magnetic gradient tensor data to better describe small anomalies. However, the measurement of magnetic gradiometer contains a very complex motion noise, separating the motion noise from the signal component is a large challenge. In this paper, we show the expression for the magnetic gradient tensor, and then through model tests proved the Kalman filter good filtering effect.
Design of Digital Communication System of XCTD Based on FSK
Authors: Zhao Jian Rui , Liu Ning , Wu Yu Hua
Published: September 2014

According to the problem of expendable conductivity temperature depth profile (XCTD) of transmission signal waveform distortion and undistinguishable information caused by cable time-varying parameters and influence of seawater. This paper designed a based on FSK (Frequency shift keying) of digital communication system. It used single-chip modem chip FX604 used in FSK modulation and demodulation of the signal. And it implements the digital signal transmission on thin wire communication on the water. The system overcomes unfavorable conditions about transmission channel and marine environment. The circuit is easy and practical.
An Efficient and Feasible Color-Based Technique for Object Picking
Authors: Luo Zhong Lan , Lu Kai , Wang Xiao Ping
Published: September 2014

3D object picking, or 3D object selection, is a very important human-computer interaction technique. By touching the object in the 2D screen, users can change some properties of the corresponding object in the 3D virtual world. 3D object picking is widely studied and applied in the following three situations: 1) the target object is significantly occluded; 2) the target object has small size; 3) and the target object is in a dynamically changing location. Since most previous 3D object picking techniques were developed and tested in static or negligent contexts, many 3D applications tended to incorporate small size and dynamic objects as part of their typical interaction, which doesn’t meet the needs of the development of today’s touch screen technology. Thus, this paper proposes a new color-based picking technique in 3D scene to solve this problem. We provide two different solutions for different application scenes: for the target object whose surface has a fixed color, we take the fixed color as the picking tag; as to the object whose surface has customized texture, we regard the invisible color package set by us as the picking tag. The evaluation shows that we have obtained significant increases of the picking accuracy in many different scenes when compared with the improved ray-casting picking technique.
Research on Land Utilization Information Publishing Based on Google Maps
Authors: Zhang Xiao Yu , Li Xiang
Published: September 2014

At present, the common Web map service only supports browse and query, but does not support vector data publishing. This paper proposed a WebGIS construction method based on Google Maps, which supports the interoperation and spatial analysis of vector data of many browsers. Aiming at the land utilization information publishing requirement in Zhengzhou City, adopting B/S frame, with the help of Google Maps API and AJAX technology, we realized a systematized and standardized publishing platform for land utilization information. This platform has a fast response speed, faces various types of users, supports data sharing and can provide a better service for studies on land utilization change and decision-making on land consolidation.
Compressed Channel Sensing Algorithm Based on Cluster Sparsity
Authors: Wang Yan , Zhang Li Yi , Zhang Rui
Published: September 2014

According to cluster structure feature for wideband sparse channel, the Cluster Regularized Adaptive Matching Pursuit (CRAMP) algorithm is presented based on the study of the original compressed channel sensing estimation algorithm. The proposed algorithm can accurately reconstruct the channel by both the adaptive process which chooses the number of candidate clusters and the regularization process which Support for secondary screening of candidate clusters, although the cluster sparsity of the channel is unknown. Simulation results show that the proposed algorithm’ performance is better than the BP, OMP, BOMP algorithm.
Research of the Aerial Camera Lens to Eliminate the Secondary Spectrum
Authors: Liang Zheng
Published: September 2014

Aerial cameras are widely used in resource surveys, topographic mapping, military reconnaissance and many other fields. This paper introduced the sort of aerial camera, the development in our country and abroad about the theory of secondary spectrum. In order to meet the requirement for simple structure and high-resolution, the optical design of the apochromatism objective lens of aerial camera is achieved by common optical material. Objective’s focal length is 400mm, relative aperture is F/4 and work waveband is 420nm~850nm. Designing results show that the MTF of every field above 0.75 in 60lp/mm and satisfy the requirements of imaging for large frame array CCD whose effective size is 36mm×48mm.
Bayesian Robust Coding Face Recognition Algorithm Based on New Dictionary
Authors: Guo Ye Cai , Zhang Ling Hua
Published: September 2014

In order to overcome the defects that the face recognition rate can be greatly reduced in the existing uncontrolled environments, Bayesian robust coding for face recognition based on new dictionary was proposed. In this proposed algorithm, firstly a binary image is gained by gray threshold transformation and a more clear image without some isolated points can be obtained via smoothing, secondly a new dictionary can be reconstructed via fusing the binary image with the original training dictionary, finally the test image can be classified as the existing class via Bayesian robust coding. The experimental results based on AR face database show that the proposed algorithm has higher face recognition rate comparison with RRC and RSC algorithm.
Research and Design of the Communication Middleware for the Distributed System
Authors: Zhang Jin Hai
Published: September 2014

This article on inter-process communication mechanism has conducted in-depth research and analysis of traditional UNIX system under the environment of the inter process communication mechanism and existing mechanisms for process communication in distributed environment. And on that basis propose new interprocess communication mechanism in distributed environment. Given interprocess communication semaphores and Message Queuing design ideas and implementation details, and compare it with the traditional way, we concluded that in the case of performance does not deteriorate, provides better user interfaces and location transparency and access higher transparency.
An Adaptive Narrow-Band Filter with Variable Step
Authors: Wang Da Ming , Wang Jian Hui , Cui Wei Jia , Yang Xu Hui
Published: September 2014

LMS algorithm is a kind of classic adaptive algorithms. Although it has the virtue of simple operation, it also shows the defects of relatively slow convergence and big steady state errors in low SNR. To remedy these defects, this paper put forward a new variable steps adaptive LMS algorithm. In the transient state, the learning rate increases slowly with the iteration times which accelerate the convergence rate of LMS algorithm. In the steady state, the learning rate decreases gradually with the iteration times which guarantee the convergence accuracy of LMS algorithm. After this improved algorithm is applied in the design of adaptive wavetrap, the simulation results show that it can not only effectively ease up the conflicts between convergence rates and steady state errors, but also improve the performance of wavetrap in real-time trapping.
Three-Dimensional Recognition Technology for Rare English Words
Authors: Chen Qiang , Xu Li Mei
Published: September 2014

This paper mainly studies modeling and recognition of 3D English words’ images. With the development of secondary modeling, segmentation and recognition theories and the application of evolution computation in 3D modeling and recognition, this paper analyzes the issues of parameter fitting in the 3D model, multi-object scene segmentation and parts recognition aiming at the 3D data features in the English words. The 3D model is used as the primitives part to model and segment the scenes and the group parallel evolution and the relationship matching theories are introduced into the 3D modeling and recognition to deeply identify the rare English words’ images. The paper searches for a practical and efficient three-dimensional modeling and identification scheme.
The Research on Computer Recognition Technology for Blurred Alphabet Images
Authors: Liu Chun Rong
Published: September 2014

This paper mainly studies the recognition issue of blurred alphabet images. If alphabets in an image is blurred, it is difficult t be recognized. To avoid the defect, the paper proposes a computer recognition method for blurred alphabet images based on grayscale class variance algorithm. The algorithm executes non-linear transformation on feature parameters of alphabets images extracted to obtain eigenvector coefficient weights, and then calculates characteristic correlation coefficient through wavelet transform to realize the blurred alphabet recognition. Experiments show that, the proposed method improves the accuracy of the blurred alphabets recognition and achieves satisfactory results.
Simulation Analysis for Collecting Model of Train Remote Communication Signal
Authors: Huang Cong
Published: September 2014

In the technology field of world's high-speed Computer Numerical Control (CNC) communications, accelerating research for remote communications signal technology will not only promote the development of China's high-speed remote technology, but also has far-reaching scientific value, industrial and economic value to the train remote communications. The new train remote communication technology is the basic topic with high technology, which has complicated procedures, in fact, contains mixture and summary of multi-skills, such as the compute control, application of sensor technology, the recognition of test skills and digital signal processing, and aggregation. Therefore, it can improve signal collection efficiency, and access to dynamic unbalance signal of the train remote communication signal.
Image Feature Matching Based on SIFT Algorithm
Authors: Zhang Xin , Zhang Ya Sheng , Yao Hong
Published: September 2014

In the process of image matching, it is involved such as image rotation, scale zooming, brightness change and other problems. In order to improve the precision of image matching, image matching algorithm based on SIFT feature point is proposed. First, the method of generating scale space is introduced. Then, the scale and position of feature points are determined through three dimension quadratic function and feature vectors are determined through gradient distribution characteristic of neighborhood pixels of feature points. Finally, feature matching is completed based on the Euclidean distance. The experiment result indicates that using SIFT feature point can achieve image matching effectively.
Research and Exploration on Static Image Compression Technology Based on JPEG2000
Authors: Tian Hua , Li Ming Jun , Liu Huan Huan
Published: September 2014

This article introduces GPU-accelerated image processing parallel computing technology into standard core coding system of JPEG2000 static image compression and accelerates and designs the image compression process using CUDA acceleration principle. It also establishes the algorithm of image pixel array layered and reconstruction coding and realizes the coding of this algorithm using VC software. In order to verify the effectiveness and universal applicability of the algorithm and procedures, this paper compresses four images of different sizes and pixels in the static form of the JPEG2000. Through the comparison of the compression time, we can find that GPU hardware image processing system has a higher speedup ratio. With the increase of pixel and size, speedup ratio gradually increased which means that GPU acceleration has good adaptability.
Multi-Channel Data Acquisition System Analysis and Modeling
Authors: Zhang Ning , Wu Ze Hua
Published: September 2014

College English learning now has attracted a great deal of attention, but many non-English majors students have major problems in terms of English learning, and how to improve the non-English majors' autonomous learning efficiency is the problem that the majority of English educators can not ignore. Through a college non-English major students' English learning science test survey, usual English learning and English language proficiency scores for tracking and monitoring, and data for scientific analysis, and monitoring results, this article indicates that by increasing the non-English majors' autonomous learning teaching mode, the students' efficiency and academic performance have improved significantly. From subsequent cognitive satisfaction survey for self-acceptance, this teaching mode's performance is quite satisfactory.
The Evaluation Methods Based on Image Features Comparison
Authors: Xu Cheng Long
Published: September 2014

The paper studies the dancing gestures evaluation method based on images features comparison. The current methods for dancing gestures are according to the people’s vision, which are usually not accurate. Once the dancing is more complex, the conventional methods have the defects of low accuracy. Therefore, this paper proposes an optimized algorithm based on image features comparison for dancing gestures evaluation in which the dancing gestures images are collected. The features in the dancing images are extracted and compared based on the Scale Invariant Feature Transform algorithm (SIFT). The experimental results show that the improved algorithm can increase the accuracy for dancing gestures evaluation greatly.
CT Images Segmentation Based on Dynamic Relative Fuzzy Region Growing Algorithm
Authors: Zhang Zhen You , Lou Guo Huan
Published: September 2014

Segmentation algorithm of CT Image is discussed in this paper. Dynamic relative fuzzy region growing algorithm is used for CT. At the beginning of the segmentation, the confidence interval region growing algorithm is used. The overlapping parts in the initial segmentation result is segmented again with the improved fuzzy connected, and then determine which region the overlapping parts belong to. Thus, the final segmentation result can be obtained. Since the algorithm contains the advantages of region growing algorithm, fuzzy connected algorithm and the region competition, the runtime of segmentation is greatly reduced and better experimental results are obtained.
Parameter Estimation of Polynomial Phase Signal by Unscented Kalman Filtering
Authors: Li Wan Ge , Hu Jin Feng , Ai Hui , Lin Zhi Rong , Zhang Ya Xuan
Published: September 2014

The parameter estimation of the Polynomial Phase Signals (PPS) is one of the core issues. In this paper, UKF-based algorithm is proposed to estimate the parameter of PPS embedded in Gaussian noise. The algorithm constructs an adequate state-space model to represent the PPS and the model can also be implied in real radar signal. Unscented Kalman filtering is applied to estimate the signal parameters. The method achieves the lower SNR threshold, the faster convergence speed, the higher accuracy and more stable estimation performance compared with the existing methods. Simulation also verifies the efficiency of the proposed method.
Application of Texture in a Compressed Visual Simulation
Authors: Zhang Wei , Zhang Chun Hua , Ren Jia Yue
Published: September 2014

Texture compression technology is an effective way to improve the capacity of the texture without increasing the texture memory. This paper studies a texture compression method based on mipmap technology, details several texture compression formats, and describes the texture file of several formats generating and corresponding parameters adjustment. Practical results show that the texture compression method based on mipmap technology can not only achieve high texture compression ratio, but also cause no effect on the texture quality.
Filtering Performance of Digital Alternate Array on Target Tracking
Authors: Cao Dong Kai , Li Jun , Liu Hong Ming
Published: September 2014

For target tracking of agile digital array, we propose a novel model called alternate array. The model means that total array is divided into vertical subarray at the present moment, and vertical subarray is transformed into horizontal subarray at the next moment, then the subarray comes to the first subarray divisions, and so on. Alternate array gives rise to differences of statistical characters of measurement error. Filtering performance is influenced by the feature of measurement data. In the paper, we come up with a new method based on Kalman filter (KF) to solve the difficulty. The new method merges pre-processing and data fusion thought together. Simulation results demonstrate the validity of the proposed algorithm.
The Research of Calling System Based on GPS Positioning
Authors: Zhang Chun E , Yang Li Juan , Li Ying
Published: September 2014

At present, take a taxi difficult has drawn people’s attention and become the problems to be solved in china. In this paper, a new solution of taxi calling is proposed, after the detailed analysis to the advantages and disadvantages of various calling modes. This solution can change the traditional mode of “taxi looking for people” and “people looking for taxi” to “taxi waiting for people” and “people waiting for taxi”, and sequentially improve the actual load rate of taxi and the satisfaction of passenger.
An Improved PCA-SIFT Algorithm by Fuzzy K-Means for Image Matching
Authors: Zhang Ning Li , Ma Yan , Zhang Xiang Fen , Xu Yan Lu
Published: September 2014

Image matching plays an important role in computer vision. The features extracted by SIFT algorithm have high stability invariant to scale, rotation and light, so it is the most popular algorithm for image matching. While SIFT algorithm also has its disadvantages of high dimensional data and time-consuming. To solve this problem, the traditional method employs PCA algorithm to reduce dimensionality of the descriptors. While PCA is a linear dimensionality reduction algorithm which means that it can only be used for linear distributed data. This paper employs the fuzzy K-means algorithm to improve it (referred to as FKPCA) and improved RANSAC algorithm to eliminate false matching points after matching with PCA-SIFT and FKPCA-SIFT. From the experimental results, compared with PCA-SIFT algorithm, it can be seen that FKPCA-SIFT can keep the high matching accuracy for image. Moreover, FKPCA-SIFT can also be applied to non-linear data to expand the scope of PCA-SIFT and provides a better reference platform for further research.
The Diversity Gains of Amplify-and-Forward Relay System with Frequency Selective Channels
Authors: Ding Y.H. , Tian R.J. , Xue K. , Tian Y. , Wang X.C. , Shi Y.M. , Ma X.
Published: September 2014

The diversity gains of amplify-and-forward (AF) relay system with frequency selective channels are discussed. The orthogonal frequency division multiplexing (OFDM) is applied to overcome the inter-symbol interference. The diversity gains are presented for single and multiple relay systems with detailed derivations.
A New Algorithm of Image Matching Combining Sift and Shape Context
Authors: Xu Yan Lu , Ma Yan , Li Shun Bao , Zhang Ning Li , Zhang Xiang Fen , Zhang Yu Ping
Published: September 2014

This paper presents a new algorithm of image matching via combining sift and shape context for improving image matching accuracy. A joint descriptor is applied to describe feature points. The initial matching is obtained by a proposed distance formula. Furthermore, PLS is introduced to eliminate mismatched points. Experimental results demonstrate the proposed algorithm can achieve better performance compared to conventional methods.
Human Head Portrait Feature Extraction Based on SIFT
Authors: Ding Xue , Han Shun , Yang Hong Hong , Wang Xiao Feng , Yang Kun Wu
Published: September 2014

As the number of students who attend the arts exams has been growing, each admission institutions need to score the human head portraits of art sketch with the number of ten thousand and even 100 thousand. Thus it is an innovative research on how to conduct image recognition with the help of advanced computer technology. Image Recognition Technology is to give the computer the intelligence of human vision, so that the computer can quickly and accurately recognize the object on the input images. However, in the recognition process such factors as light, rotation and shield increase the difficulty of identifying the human head portrait images. In order to get better recognition performance, this paper studies the feature extraction of human head portrait based on SIFT (Scale Invariant Feature Transform). From the practical application, it can be seen that the approach proposed in this paper is feasible and is of good recognition performance.
A Research of Speaker Recognition Based on VQ and MFCC
Authors: Huang Chen Chen , Gong Wei , Fu Wen Long , Feng Dong Yu
Published: September 2014

—Feature extraction is a very important part in speaker recognition system. We proposed and implemented a speaker recognition algorithm based on the VQ and weighted fisher ratio of MFCC. To evaluate performance of this algorithm, we built a small speaker recognition system based on the MATLAB. Compared with the traditional feature selection methods, the characteristic vector obtained via this algorithm has the greatest degree of differentiation in the same dimension. According to the test results, the speaker recognition algorithm we proposed in this paper, can significantly increase the accuracy rate of training and recognition, and reduce the data required by calculation, in the case of keeping a higher recognition rate.
Wavelet Analysis in the Application of Signal Processing
Authors: Sun Yi Dan , He Zi Heng
Published: September 2014

Nowadays, signal attracts more and more concerns from all walks of life as an information carrier in the information age. However, Fourier Transform which separately deals with time and frequency domains may not be fully competent as a signal processer in the digitization of communications system. Wavelet analysis is a strong signal processing method, which can not only fetch the features of the signal, but also achieve the signal denoising, compression, determine trends, and other functions .Image denoising and voice denoising were two empirical analyses in this study, which indicate certain research value of wavelet analysis for the development of signal processing.
The Application of Airborne Remote Sensing Technology in Land and Resources
Authors: Dong Li Na , Tong Jing , Wang Chen Yang
Published: September 2014

Airborne and space remote sensing system are all the important parts of the earth observation system, also being good supplements to each other. Airborne remote sensing has the advantages of being high resolution, good efficiency and flexibility, which makes itself an effective method to rapidly acquire high resolution remote sensing data. Particularly, the technologies of conducting low altitude remote sensing investigation by unmanned aerial vehicles are rapidly developed with a great progress achieved, so there is no doubt that it will plays an important role in the remote sensing geological investigation.
Image Space Coordinates Extraction Algorithm Based on the Perspective Projection Transformation Matrix
Authors: Zhang Bao Long , Yang Ji Chao , Lee Hong Rui
Published: September 2014

The paper analyses the 3D graphics transformation in computer graphics and its displays process. The method of graphics transformation is introduced. The analysis focuses on the perspective projection transformation matrix theory and its derivation. The calculation method of image space coordinates in the image point coordinates systems is introduced.
Analyses of Ad Hoc Routing Protocol Based on Emergency Communication
Authors: Yu Xiang , Yi Dan Dan
Published: September 2014

Ad Hoc network as a wireless multi-hop network, it can expand the communication coverage. It is very suitable for emergency communication system when communication infrastructure has been destroyed and are too late to repair. In this paper, against the application scenarios and business needs in emergency communication system, and through analyses of the Ad Hoc routing protocols, performances of several routing protocols were quantitatively analyzed by NS-2. We finally discuss the results and present some conclusions.
Research of SIP Signaling Delay in IP Multimedia Subsystem
Authors: Yu Xiang , Zhang Xiao Ning
Published: September 2014

Optimizing the transmission efficiency of data is becoming an indispensable job in voice radio communication system. IP Multimedia Subsystem (IMS) standardized Session Initiation Protocol (SIP), which categorize as a signaling protocol for management and maintenance of new multimedia IP-based services. Session setup delay is one of important index of it. In order to reduce SIP signaling delay, to begin with, we analyze and study the factors affecting the session setup delay from different points, and solve the problems in good ways. In the end of the article, we contrast five compression algorithms of SIP signaling.
Fetal Electrocardiogram Extraction Based on SWT-MM Method
Authors: Liao Qiong , Luo Jie , Liu Yang
Published: September 2014

Fetal electrocardiogram (FECG) is of great importance due to the potentially precise information that FECG carries could assist clinicians in making more appropriate and timely decisions during pregnancy and labor. In this paper, a method based on combined Stationary Wavelet Transform and Modulus-Maxima (SWT-MM) method is proposed for extracting the complete morphology of the FECG from maternal abdominal ECG (AECG). It particularly provides a different way of constructing the maternal ECG (MECG) template. The Efficacy of the method was validated using real data in Non-Invasive Fetal Electrocardiogram Database. The morphology of the extracted FECG was clearly seen that the fetal R-peak detection by simple differential-threshold method acquired the average accuracy of 96.8%. The method provides additional important benefits of fast speed and automated control for applying into the fetal monitors. Therefore, the method is potentially a strong tool for FECG extraction, especially in real-time use.
An Optimization Algorithm of Image Defogging Based on Retinex
Authors: Ji Xiao Qiang , Cheng Jie Zhang , Du Hui , Zhang Ting Ting
Published: September 2014

In order to enhance the image contrast obtained in fog or haze, an optimized algorithm that based on the modified Retinex module is proposed. According to the defects of the traditional Retinex algorithm, such as high complexity and the halo phenomenon, this method enhanced the image global contrast by modifying the illumination component, and corrected the reflection component using nonlinear function. The experimental results showed that it can increase foggy image clearness quickly, adjust the image brightness effectively and overcome time-consuming drawback of original algorithm that greatly improve the efficiency and speed.
Study on Parameter Matching of Drive System in Pure Electric Vehicle Based on AVL-CRUISE
Authors: Cao Jing Sheng
Published: September 2014

Based on demand for power performance of electric vehicle, preliminary design of power requirement of drive motor and transmission ratio is conducted using method of theoretical calculation, simulation model of whole vehicle is established using AVL-CRUISE software, in order to improve the economy of vehicle, transmission ratio of drive system is optimized. Under the premise of ensuring power performance, economy of vehicle is improved.
Design of Remote Data Acquisition System Base on ZigBee and GPRS
Authors: Xu Da Wei , Deng Lei Lei , Ren Shan
Published: September 2014

ZigBee technology is a small disadvantage of network coverage, this article will introduce GPRS wide-area wireless communication technology ZigBee network, ZigBee network to build a remote data collection and management system, and use intuitive embedded Web server to improve management efficiency. System test results prove that the system has good validity and reliability.
A Secure Lightweight Mutual Authentication for RFID Systems
Authors: Qin Hang , Liu Yi
Published: September 2014

Radio Frequency Identification (RFID) technology is an automated identification technology which is widely used to identify and track all kind of objects. It is well suitable for many fields and is expected to replace barcodes in the near future. However, it is a challenging task to design an authentication protocol because of the limited resource of low-cost RFID tags. Recently, a lightweight RFID authentication protocol presented by Kulseng et al uses Physically Unclonable Functions (PUFs) and Linear Feedback Shift Registers (LFSRs) which are well known lightweight operations. The number of gates which the protocol require can be significantly decreased. Unfortunately, their protocol faces several serious security issues. In this paper, based PUFs and LFSRs, we suggest a secure mutual authentication for low-cost RFID Systems. Security analysis shows that our protocol owns security and privacy.
Method of Base Station Positioning for Smart Phone Based on Vector Matching
Authors: Meng Xiang Yu , Li Xue Jun , Gao Teng Fei
Published: September 2014

This paper presents a method of base station positioning for smart phone. This method uses discrete points to represent small areas of the same barrier model, and positions by RSSI feature sampling and vector matching. By avoiding the effect of base station location, signal strength, and transmit model, this method can effectively reduce the error. Experiments in real environment show that the method can recognize two sides of a wall and has a very high accuracy in built-up area.
High-Reliable WDM Optical Access Network Expanding by Double-Fiber-Tangent Ring
Authors: Shao Qi , Shao Yu
Published: September 2014

A WDM optical access network architecture based on double-fiber-tangent rings is proposed. With the proposed architecture, both data convergence and link protection can be realized. OLT and RNs can automatically switch to protection mode to overcome fiber failure occurring no matter in both primary ring (PR) and sub-ring (SR). The RNs designed as tangent points can realize wavelengths adding and dropping between PR and SR, and they also can realize network expansion through adding more wavelengths. In addition to this, the design of double-fiber ring can better the survivability and self-healing ability of the network.
Modeling and Analysis of Mobility Management in Wireless Communication Networks
Authors: Chen Jie , Xi Wen , Mo Wei , Sun Xiao Long
Published: September 2014

This paper analyzes the new challenges that mobile management faces against to variety of access network coexistence and large number of mobile terminal access demanding in the future. According to the existing researches and the typical exemplification, this paper illuminates the definition and classification of location management. Based on this, a model framework of location management cost is proposed and it will have extremely vital significance for guiding 4G and the mobility management in the future. Finally, it points out the new challenges and new topic about mobility management in the future ubiquitous network and heterogeneous network environment.