bluuebunny/crossref_metadata_2025 huggingface dataset:
Structure Strength Analysis on a Steel Chimney Outer Wall with Three Spiral Guide Plates
Authors: Deng Xu Lei , He Jia Ning , Zhang Chao
Published: February 2014

Study on a steel chimney outer wall with three spiral guide plates in this paper. Research the steel chimney structure stability and static force analysis under wind loads by using ANSYS Workbench and CFX fluid mechanics modular. To prove the steel chimney with three spiral guide plates structure is more safe and stable than the old steel chimney. Provides a new transformation basis of the steel chimney as the ratio of height to diameter is large and low flexural strength.
Occultation Judgment for the Hemispherical Coverage Multi-Planar Arrays Antenna
Authors: Hao Jian Hua , Pan Dian Fei , Cheng Nai Ping
Published: February 2014

A flexible hemispherical coverage array antenna based on multi-planar arrays is proposed to meet the growing demands for multi-target TT&C. The advantages and disadvantages of multi-planar arrays and dome phased in engineering implement are compared. Meanwhile, the influence of different number of plane arrays on antenna pattern is analyzed. For the purpose of interference suppression a novel beamforming method by adding constraint conditions is analyzed to enhance the performance of antenna for TT&C system. Considering the influence of occultation effect on the antenna performance, an effective occultation algorithm is presented. Firstly, the faces in bright area are projected on the plane that is perpendicular with the direction of receiving wave. Secondly, adopting the principle of line segment intersection, the intersect relationship of projective planes is determined. Finally, the facets shadowing relationship is judged by the overlapping and depth-of-view of facets along the receiving wave direction. Theoretical analyses and simulation results show that the antenna has approximate uniform gain beampattern in different steered angle and the occultation algorithm is feasible and effective.
Study on Robot's Obstacle Avoidance Walking
Authors: Li Jian Jun , Zhu Jun Jie
Published: February 2014

The paper researches on robots obstacle avoidance walking in a certain range, searching the shortest path between two points and the shortest walking time under some limitation of speed conditions. The paper first uses AutoCAD software to carry out field simulation, drawing out various robot walking route options. Then applying the distance between two points, sine and cosine theorems and related knowledge of plane geometry such as arc length formula to carry out modeling, and then uses Mathematica software to calculate various length of the path, finally take the shortest after analysis and comparison. On this basis, and after summed up various walking routes, we can see that from the start point to destination in this paper, the less the wheel number is, the narrower the distance between obstacles is, the shorter the path is. Finally, the paper carries out systematic evaluation and improvement on the disadvantages and advantages of the model, and gives the model promotes ideas.
Under the Uniform Linear Array Related Research of Broadband Signal DOA Estimation Algorithm
Authors: Chen Fa Tang , Wang Lu Gang , Wang Dan
Published: February 2014

In order to solve the positioning problem of radar and communications, broadband signal and improve the positioning accuracy, this paper proposes a method of DOA estimation under uniform linear array, the method based on fast Fourier transform, using narrowband MUSIC algorithm principle, the broadband signal decomposition for multiple narrowband signal frequency band, and then for each frequency band for narrowband signal DOA estimation. The simulation results show that the algorithm has good performance.
Patent Early-Warning Model Based on Visualization
Authors: You Wei Tao , Chen Shi , Yang Zhi Yuan , Sun Zhi Qiang
Published: February 2014

Nowadays, patent early-warning becomes a hotspot with the increase of patent disputes events. Many methods have been developed to solve this problem especially patent map. Therefore, in order to facilitate patent analysis based on patent map, we proposed a visualization model of patent early-warning according to present researches and developed a prototype system in this paper. With the aid of computer and experts, users obtained more comprehensive and more precise results on both microcosmic and macroscopic levels.
An Extend SIR Opinion Dynamic Model Base on Empirical Signed Network Mining
Authors: Li Wei , Li Pei , Wang Hui
Published: February 2014

Relations between users on online social media sites often reflect a mixture of positive and negative interactions. The network composed by those positive and negative relations is called signed social network. We design a web crawler to collect the data base on a special web event of battle between Fang Zhouzi and Han Han. And we construct a signed social network with sentiment weighted relationships base on this empirical data. Under this empirical spread web structure, we construct an extended SIR spread model in such a signed social network with sentiment weighted relationships, and we study influence with the network factors of signed, directed and weighted on opinion spreading. Under this model, we could know the proportion of signed edges is most important factor to the spread result.
Research on the Growth Mechanism of High-Skilled System in Computer Science and Technology
Authors: Gong Song Jie
Published: February 2014

Highly skilled systems are the master hands and examples in the production line. They meet the quality requirements for highly skilled that knowledge and skill proficient, thoughtful, and creative. The systems that have innovative sense and high-skilled ability are required by not only the modern science and technology revolution, but also the economical and social development of a nation. In high-skilled systems, especially the system of computer with stronger practicality and operability, how to strengthen the cultivation of the ability of innovation and high-skilled is very important. The paper analyzed the connotation of innovative high-skilled systems. Taking the growth mechanism in innovative high-skilled systems as an example, and school-enterprise cooperation and work-integrated learning as starting point, it explores and practices on the training mode. According to the construction of high level productive practice training base, it can provide reference for similar researches of growth mechanism in training innovative high-skilled talents.
Analyse of OFDM System by BER Performance Method
Authors: Wang Wen Bin , Liu Dao Yuan , Yao Yu Qin
Published: February 2014

This paper studies and analyzes the BER performance of the OFDM system, and completes the system simulation on this basis, measures and calculates the BER through the SNR, the Doppler effect and the Short Guard Interval. During the simulation, we use BPSK, QPSK and 16PSK modulation techniques, and choose the Gaussian white noise channel. Using SNR, Doppler effect and Short Guard Interval effects to OFDM signal can improve the system performance.
Segment Compressive Sensing of Pipeline Data by Sequential Approach
Authors: Wan Hong Jie , Ma Jing , Lin Wei Guo , Yu Bo Ran
Published: February 2014

In distributed optical fiber pipeline pre-warning system, the sampling rate is very high for threatening event location, so vast data will be generated which is inconvenient for transfer or storage. This paper adopts the compressive sensing approach to reduce the data quantity. The sparsity of each segment of the signal is important for signal recovery, and it controls the measurement number needed. However, the sparsity of every segment is difficult to achieve. In this paper, the sequential approach is used to fix the measurement number of each segment of the optical fiber pipeline data. This segment sequential approach further reduces the amount of data on the basis of compressive sensing. Simulation is carried out on the actual optical fiber pipeline pre-warning data, and the experimental results show that the reconstruction SNR could exceed 26dB using this algorithm.
The Research of Electrical Equipment Identification Technology Based on Image Processing
Authors: Shi Gui Ming , Liu Zheng Jun , Su Hang , Wei Qing Tao
Published: February 2014

Insulator is a tiny part in electrical equipment, but whether its working condition is safe or not plays a vital role in the safe operation of the entire power system. In this paper, digital image processing technology based on MATLAB is applied, the obtained image of the insulator is processed through filtering, gray-scale processing and binarization processing. The parameters such as insulator's bottom circle area and edge width are extracted, and compared with the calibration parameters to determine the size of insulators. The method to getting more precise characteristic values of insulators is described in this paper. It provides the evidence of judging the working state by comparing with the calibration value to capture measurements of insulators. The digital image processing technology based on MATLAB can effectively monitor the working status, high efficiency and accuracy of the insulator.
Research on Identification Technology of Vehicle License Plate Based on Image Processing
Authors: Shi Gui Ming , Wu Tong , Su Hang , Wei Qing Tao
Published: February 2014

Automatic vehicle license plate is an important part of intelligent transportation system. The success of the plate recognition will have a deep impact on the construction of intelligent transport systems. Image processing, tilt correction, character delimitation, character recognition and matching are main applications of vehicle license plate recognition, and the above process are implemented in matlab environment. Vehicle license plate location is implemented by vehicle license plate locating method based on edge detection and morphology filter in this article. The tilt correction mode based on Hough transform is used for license plate tilt correction section; character delimitation algorithm is used for character delimitation to achieve the vehicle license plate character segmentation; character recognition method based on template matching is chosen for character recognition section in this article, and successfully identify the license plate number.
Thermal Load Simulation and Structure Improvement of High Speed Diesel Engine Piston
Authors: Ning Hai Qiang , Dou Jin Sheng , Huang Xing Hua , Xie Yuan Wen
Published: February 2014

In order to solve cylinder-scraping of a four-cylinder high speed diesel engine, based on the measurement of piston temperature, the piston temperature field was numerically simulated by using temperature fitting method, the calculation results were well consistent with the measured temperature. By finite element analysis of piston thermal load based on the calculation results as temperature load, enlarging oil cooling cavity in the piston head was proposed to enhance cooling locally, which could effectively reduce temperature of the piston head and the first ring groove and avoid the occurrence of cylinder-scraping.
Temperature-Induced Structure and Morphological Transformation in SnS Prepared by a Chemical Vapor Deposition Method
Authors: Zhuo Ren Fu , Wang Yi Nong , Yan De , Xu Xiao Yong , Wu Zhi Guo
Published: February 2014

SnS thin films were deposited at different temperatures on silicon and quartz plates through directly elementary reaction via a simple chemical vapor deposition (CVD) process. The as-prepared products have a transformation of morphology from plate-like to granule-like when the temperature increased. A mechanism involving two competitive factors, surface energy and binding energy, was proposed to understand their growth. The products prepared at low temperature were single crystal while the films made in high temperature are polycrystal, the optical band gap (1.2~2.1ev) and the Sn:S atom ratios increases as the deposited temperature increases.
Analysis and Research Regarding Characteristics of THz Receiver Noise Using Diode Parameter Error
Authors: An Da Wei , Gu Song Yan , Lu Feng , Wan Cheng Cheng , Yu Wei Hua
Published: February 2014

In this paper, an analysis and study regarding the characteristics of THz receiver noise using diode parameter error are performed. For a sub-harmonic mixer designed based on this type of diode model. Finally, this type of mixer was adopted to build a 183 GHz receiver system . The special are study the influence of the diode model process error on the receiver system noise characteristics, based on theory and modeling. The results show that diode ideality factor ns change exerted the greatest influence on the noise factor of the front end of the receiver, as well as similar influence over bias junction capacitance Cj and bulk resistor Rs, and minimal influence over saturation current Is.
A Control System in Satellite Navigation and Communication Terminal
Authors: Hu Zheng Qun , Ai Guo Xiang , Zhang Li Rong , Hu Chao
Published: February 2014

For the needs of a satellite navigation and communication system, we design and implement a terminal control system in the integration of navigation and communication system in this paper. The control system consists of CPU controller, GPS positioning module, smart finding and alignment satellite module, transmit/receive baseband, RF module, voice module and other functional modules, which has navigation and communication function. Satellite communication includes voice communication and data communication. The voice communication interface is operated conveniently, which using I/Q quadrature BPSK modulation to set up satellite links easily. It has a good communication quality. Data communication using the bidirectional answer mode to make success rate close to 100% in data upward to the communication center station, which is well to meet the needs in data upward.
The Frequency Domain Analysis of Speech Signals Based on MATLAB
Authors: Cui Wei Ping , Wang Xiu Yan
Published: February 2014

Frequency domain analysis of speech signal includes spectrum analysis, power spectrum and the inverse spectrum, spectral envelope analysis. The common methods of frequency domain analysis includes bandpass filters , Fourier transform, linear see method etc.. Using MATLAB discusses the short section of the speech signal spectrum, cepstrum and complex spectrum, the pitch and formant simulation results are given.
Research on Velocity Measurement of PD Radar Based on Non-Coherent Accumulation and Waveform Analysis
Authors: Zhang Xu Dong , Yuan Yun Neng , Wang Jun
Published: February 2014

According to the process of PD radar target tracking, the radial motion of target has a significant impact on velocity measurement. Simulation shows that there is an apparent relation between radial velocity and non-coherent accumulated waveform. Based on the calculation of the entropy of non-coherent accumulated waveform, a method based on waveform entropy in velocity measurement is proposed. Experiments show that the new method can achieve high measurement accuracy, and is insensitive to velocity. At the same time, a rough estimation of velocity is used to shorten the running time.
Angle Estimation for Bistatic MIMO Radar with Unknown Mutual Coupling Based on Improved Propagator Method
Authors: Li Jian Feng , Chen Wei Yang , Zhang Xiao Fei
Published: February 2014

In this paper, joint direction of departure (DOD) and direction of arrival (DOA) estimation for multiple-input multiple-output (MIMO) radar with unknown mutual coupling is studied. An improved propagator calculation method is proposed to overcome the performance degradation problem when signal to noise ratio (SNR) is low. Thereafter, according to the Toeplitz structure of the mutual coupling matrix, the rotational invariance can be extracted for the angle estimation regardless of the mutual coupling from the augmented propagator matrix. The angle estimation performance of the proposed algorithm is better than that of estimation of signal parameters via rotational invariance techniques (ESPRIT)-like algorithm and conventional PM-like method, and angles are automatically paired. The simulation results verify the effectiveness of the algorithm.
Computer Simulation Study Based on Matlab
Authors: Xie Xiao Peng , Li Yun Yi
Published: February 2014

This paper describes the use of one of the Matlab toolbox dynamic simulation tool Simulink simulation methods, and improve simulation speed, the simulation results analysis conducted in-depth elaboration. Also describes the use of SIMULINK simulation tools to achieve automatic control system modeling, analysis and design, simulation methods and Simulink-based video and image processing module sets into visualization, modular modeling idea.
Design and Implementation of Universal Detection Equipment of Inertial Navigation System Based on "Platform + Adapter Structure"
Authors: Li Guo Dong , Zhao Chao Feng , Zhang Wen Quan , Kong Qing Bing , Wang Xian Jin
Published: February 2014

According to such problems as complicated structure, too many circuit module and online difficult detection of vehicle-mounted platform inertial navigation system, the detector adopts the detection mode of platform + adapter to realize the universalization and modularization of the detection equipment. It reduced circuit scale and the difficulty of design, strengthened systems scalability, at the same time made equipment carry and use more flexible. It realized inertial navigation board level to device level detection by using intelligent fault diagnosis technology to automatic fault diagnosis of circuit. Meanwhile, with the effective optimization of lesser detection procedures, the high efficiency and accurateness of fault isolation and location had been guaranteed, detection equipments automation, integrated, accuracy greatly raised, and detection time greatly shortened.
Air Quality Evaluation Based on Image Defogging
Authors: Yang Wen Ming , Chen Xiang , Liao Qing Min
Published: February 2014

Air quality evaluation based on digital image processing is an innovative and promising matter. The density of fog and haze can reflect air quality, therefore we introduce a new method for air quality evaluation via image defogging technology. Dark channel, proposed in [, is an excellent method to remove fog and haze. Using dark channel, we can acquire transmission map of an image, and transmission map contains the information of fog and haze's density, therefore, SDT(standard deviation of transmission) is adopted as a measure in this paper.
Indication System Weight Calculation on Quality Control of Production Process for Medical Devices
Authors: Zhang Hong Xing , Liu Yang , Shi Xue Kui
Published: February 2014

Medical devices is playing an increasingly important role in the course of people's life, it has a very important significance to strengthen the quality control of medical devices productive process. For the difficult issues of evaluation on quality control of productive process, this paper is based on quantitative analysis, using Analytic Hierarchy Process method to research. Firstly, to construct the indication system hierarchical analysis model, and to describe each indicators ; Then, on the basis of clarifying the advantages of Analytic Hierarchy Process, to set up mathematical model, including constructing judgment matrix and single-level sorting in two steps. Finally, to calculate the weight of indication system according to the solving steps. The research contents of this paper, is the basic work of evaluation for the quality control of medical device productive process, for the safe production of medical devices companies to provide technical and methodological support.
Framework Design on Customer Relationship System for Medical Devices Industry
Authors: Zhang Hong Xing , Liu Yang , Shi Xue Kui
Published: February 2014

Medical devices industry is facing severe challenges of foreign-funded enterprises and foreign products and services and other aspects. It is difficult to increase operating efficiency, so establish a scientific and comprehensive customer relationship management system is an effective way to solve the current predicament. This paper studies framework structure design in order to improve the development efficiency and quality of CRM system. First, system framework structure design can be carried on by way of graphical; then, we can conduct function framework structure design. Function system is decomposed into four subsystems: the first is sales management, the second is marketing management, the third is support and service management, the fourth is system management. Finally, we are able to do the technology framework structure design and then design three-tier architecture that includes presentation layer, business logic layer and data access layer based on B / S. The results show that it is an effective means to improve the core competitiveness of enterprises used CRM developed by design results of the paper.
Detection and Tracking Recognition Algorithm for Weak Moving Target
Authors: Niu Xiang Jie , Lan Bin
Published: February 2014

According to features of detection, tracking and identification technology of weak moving targets in image process, the paper simply introduces its technical difficulties and mainly discusses the detection and tracking algorithm for the weak moving targets. In accordance with three steps including the image preprocessing, feature selection and target tracking, the paper designs images' detection and tracking recognition algorithm for the weak moving objects in strong noise background, and describes the specific execution methods and procedures, which has a certain significance to further improve image detection for the weak moving targets.
Optimization Mechanism Modeling for Emergency Evacuation in Group Incidents
Authors: Liu Yu Jie
Published: February 2014

The paper mainly discusses the emergency evacuation when group incident occurs. In crowded areas, group incidents will result in disorder of flow information, nonlinear and catastrophe of flow density and motion direction. The traditional evacuation route guidance only selects evacuation route for orderly, smooth flow density variations, in which nonlinearity and mutation of the flow information cannot be reflected. Therefore, once the Group incidents occurred, the stability of the model will be destroyed. To solve the problem, the paper proposes an emergency evacuation method based on path collision probability estimation model. Simulation results show that this algorithm can improve the speed of evacuation.
Analysis for the Impacts of Large Logistics Industry Intelligent Monitoring
Authors: Yao Xin
Published: February 2014

This paper proposes a type of logistics industry financial income mining model with intelligent monitoring impacts. By comparing, mining and analyzing the logistics cost with intelligent monitoring, the paper calculates the intermediate difference to obtain the profits when the monitoring performance is optimal and builds the mining analysis model with the impacts of intelligent monitoring on logistics financial income. The experiment and simulation testify the relation between intelligent monitoring and logistics income, which provides theoretic foundation for solving the logistics dispatching paths selection problem.
The Research of Remote Sensing Image Fusion Technology
Authors: Wang Bin , Wang Chao
Published: February 2014

Remote sensing image fusion is an important branch in the field of image fusion. Remote sensing image fusion mainly researches how to use different aerial remote sensor to obtain relevant image information. In view of the present research status in this field and the full analysis of remote sensing image fusion method and wavelet transform, the paper aims at proposing the image fusion technology of combining discrete multiwavelet transform and HIS method, then the paper analyses the experimental results with the help of MATLAB. It is proved that the analysis method of wavelet has more advantages than traditional methods: Wavelet transform fusion method can keep maximized resolution and multispectral image.
Breakdown Characteristics of Oil Impregnated Insulation Paper with Different Ageing Condition under the Composite Electric Field
Authors: Wang Qian , Hao Jian , Liu Tuan , Fu Jin , Wu Gao Lin
Published: February 2014

There are many researches about the effect of oil/paper proportion, testing temperature, AC/DC ratio and other effects on the breakdown characteristics of oil-paper insulation under the composite electric field. However, the breakdown characteristics of oil-paper insulation under the composite electric field in the process of ageing are rarely reported. In this paper, the breakdown characteristics of the oil impregnated insulation paper with different ageing condition under the composite electric field were investigated. Results show that there is no necessary link between the breakdown characteristics and the ageing degree of oil-paper insulation. The breakdown voltage value decreased with the rise of the AC component under the composite electric field. The breakdown voltage with aged paper changed by new paper is slightly higher than that of the aged oil being changed by new oil.
A Novel RFID Indoor Positioning System Based on Doppler Effect
Authors: Tong Hui Chen , Wang Dong
Published: February 2014

With the rapid growth of location-based services, indoor positioning system has attracted significant interest. Due to the long reading range and multi-tag identification capability, RFID system has the potential to estimate the accurate location of indoor objects. In this paper a novel RFID indoor positioning system is proposed based on Doppler Effect of moving RFID antenna. The system is constructed with a rotary platform, which is used to record the motion and trajectory of moving antenna. Parallel to the antenna velocity data, the Doppler frequency of RFID signal is recorded to compute the relative velocity between the antenna and target tags. By comparing the antenna movement with the relative velocity data, the position of the target is estimated using triangulation.
Accurate Dead Reckoning Localization System Using RFID Phase
Authors: Li Bo , Wang Dong
Published: February 2014

Nowadays, the demands of Location-based Service are growing fast. It contains huge business opportunities. This paper presents an efficient indoor localization scheme using Radio-Frequency Identification technology. The major idea of our method is Dead Reckoning, a method of navigation that using the best estimates of speed and direction to calculate users' motion trace. We implemented Dead Reckoning in indoor environment by taking advantage of features of RFID. We collected RFID tag phase value to calculate the velocity of users and recalibrate users' position by using known fixed RFID reader. We designed a series of experiments to verify the feasibility of our velocity calculation method, then we simulated the whole process of our system. The results show that our system can track user's motion effectively in indoor environment. We believe this is an encouraging result, holding promise for real-world deployment.
Research on Supply Chain Abnormal Event Detection Based on the RFID Technology
Authors: Huang Shun Ping , Wang Dong
Published: February 2014

In a complex supply network composed of suppliers, manufactures and buyers, RFID tech is used to connect different items. RFID tech makes it possible to collect data in logistics with a low cost and it can optimize the traditional method more efficiently. A platform using EPCGlobal standards supplies the base environment for high-level applications, such as abnormal event detection in a supply chain, frequent path mining and the retail theft prediction. This paper studies abnormal events detection in the supply network. The data captured from the EPC information service is used to calculate a path and the machine learning method is adopted to cluster the path.
A Contention-Based Transmission Strategy for Distributed Radar Sensor Network
Authors: Liu Xiang Yang , Wang Yang , Chen Ying Mei
Published: February 2014

A channel-sharing method was proposed to improve the energy efficiency per detection task in distributed radar sensor network. The sensor nodes transmitted their local test statistics (LTS) to the fusion center in approximately descending order of their LTSs by modifying the value of backoff timer and frame interval according to the value of their LTSs. Simulation results show that, compared with the method using dedicated channels to transfer data to the fusion center, the occurrence of the discrepancy between the global decisions of the two methods is less than 30 per a million tests. The increased amount of transmitted data, however, is not more than 5%, and the channel bandwidth of the system is reduced to of the original. Therefore, the proposed method fulfills the evident decrease in communication bandwidth, at a very small cost of detection performance.
Research on Combined Environmental Stress Test for Hybrid Integrated DC/DC Converter
Authors: Liu Xiao Wei , Ji En Rong , Xu Xiao Hua
Published: February 2014

The combined environmental stress test for hybrid integrated DC/DC converter is studied in this paper. Also several stress factors and combined environmental stress test profile are analyzed. In further, the failure modes of environmental stresses are discussed.
Sparse Representation of the Human Vision Information and the Saliency Detection Algorithm
Authors: Jin Ju Bo , Liu Yu Xi
Published: February 2014

Representation and measurement are two important issues for saliency models. Different with previous works that learnt sparse features from large scale natural statistics, we propose to learn features from short-term statistics of single images. For saliency measurement, we defined basic firing rate (BFR) for each sparse feature, and then we propose to use feature activity rate (FAR) to measure the bottom-up visual saliency. The proposed FAR measure is biological plausible and easy to compute and with satisfied performance. Experiments on human trajectory positioning and psychological patterns demonstrate the effectiveness and robustness of our proposed method.
A Novel Approach Based on Multi-Layer Background Subtraction and Seed Region Growing for Sport Graphics Segmentation
Authors: Liang Li , Wang Hong Wei
Published: February 2014

Segmentation of motion in an image sequence is one of the most challenging problems in image processing, while at the same time one that finds numerous applications. In this paper, we propose a robust multi-layer background subtraction technique and seed region growing approach which takes advantages of local texture features represented by local binary patterns (LBP) and photometric invariant color measurements in RGB color space. Due to the use of hybridization of layer-based strategy and seed region growing approach, the approach can model moving background pixels with quasiperiodic flickering as well as background scenes which may vary over time due to the addition and removal of long-time stationary objects. The experiment results prove that in the view of the sport image segmentation, this algorithm provides fast segmentation with high perceptual segmentation quality.
B-Spline Curve Approximation with Nearly Arc-Length Parameterization
Authors: Shu Si Hui , Lin Zi Zhi , Ding Yun
Published: February 2014

An algorithm of B-spline curve approximation with the three-dimensional data is presented in this paper. In this algorithm, we will get a smooth curve which is nearly arc-length parameterization. The smoothness and uniform parameterization are key factors of the approximating curve, specifically in skinning surface and surface approximation. Firstly, the data points are fitted using local interpolation, this local fitting algorithm yields n Bezier segments, each segment having speed equal to 1 at their end and midpoints. Then segments are composed of a C1 continuous cubic B-spline curve which named controlling curve. But the controlling curves control points are redundancy, so we find another curve to approximate the controlling curve using least square approximation with smoothness
Comprehensive Calculation of Winding Loss, Fluid and Temperature Field in Large Power Transformer
Authors: Jing Yong Teng , Li Yan , Li Longnv , Jiang Man Hua , Wang Ning
Published: February 2014

This paper has make a deep theoretical analysis and experimental research according to the load loss of large capacity transformer which included the loss component decomposition, the analysis of the oil flow cooling system performance and working condition, the stray loss and temperature rise of the winding area. We have done the following work on the background of the 1000kV power transformer: The winding area loss was calculated based on the weight coefficient method and field circuit coupling method; considering that the hydraulic loss of the transformer cooling system is nonlinear and the nonlinear operating characteristics of the oil flow pump, establishing the cooling oil-way mathematical model of the transformers non winding area, and analysis the working condition of the transformer cooling system. Establishing the transformer winding multi-physics coupling mathematical model and researching the transformer winding heat problem based on the nonlinear influence of the material. The error between the windings numerical calculation results and the loss, winding temperature rise meet requirements of the engineering analysis according to this method. The calculation in this paper has high precision, and it can be used in the structure optimization of the large transformer winding.
Cramer-Rao Bound for Parameter Estimation in Bistatic MIMO Radar
Authors: Li Li
Published: February 2014

The problem of Cramér-Rao bound for parameter estimation in wideband bistatic Multiple-Input Multiple-Output (MIMO) radar system is considered. In many applications, it is not appropriate to approximate the wideband signal by the narrowband model. In this paper, we propose a new wideband signal model to accurately estimate parameter for wideband signals from a moving target. The Cramér-Rao bound for target parameter estimation is derived and computed in closed form which shows that the optimal performance is achieved. Target location and parameter estimation performances are evaluated and studied theoretically and via simulations.
Information Estimation of Civil Airplane in Interference Localization Background
Authors: Li Li
Published: February 2014

The ground-air communication of civil aviation is interfered by radios, which has seriously endangered the normal flight of civil airplanes. This paper proposes an airplane information estimation algorithm based on the study of the problem of interference localization. Firstly, a novel signal model to accurately estimate parameters of the airplane is proposed. A method of Doppler estimation based on peak searching is proposed, and the 2D-MUSIC algorithm is applied to estimate the azimuth angle and elevation angle. Furthermore, the velocity and location of the airplane are estimated by employing array geometry. As a result, the airplane localization is achieved in bistatic radar, laying the foundations for interference localization. The correctness and effectiveness of the proposed method are verified with the computer simulation.
Optimal Power Allocation in SM-OFDM System Based on Visible Light Communications
Authors: Fu Hong Shuang , Zhu Yi Jun , Cai Wen Bing
Published: February 2014

Spatial Modulation is a kind of spatial multiplexing schemes conveying information by the location of transmit antennas and spatial modulation (SM) along with OFDM can be applied to visible light communications for higher data rates. The closed form of symbol error rate (SER) in optical SM-OFDM communication system is derived in this paper. SER is a convex function of power allocation coefficients, therefore there exist optimal allocation coefficients minimizing SER. The optimal allocation coefficients are derived for different channels and numbers of transmit antennas. Analytical results are validated by Monte Carlo simulation results and these results show that a significant SER improvement is obtained by using the power allocation. In addition, the optimal allocation coefficients are affected by the channel and number of transmitters.
Research on Power Management Control Strategy for Photovoltaic Power System
Authors: Zhang Chun Long , Wu Bin
Published: February 2014

A novel power management control strategy for photovoltaic power system is proposed. The solar cell array powers the steady state energy and the battery compensates the dynamic energy in the system. The goal of the power management control strategy is to control the un-directional DC-DC converter and bi-direction DC-DC converter to operate in suitable modes according to the condition of solar cell and battery, so as to coordinate the two sources of solar cell and battery supplying power and ensure the system operates with high efficiency and behaviors with good dynamic performance. A 500W experimental prototype of photovoltaic power system was built in the lab. Experimental results are shown to verify the effectiveness of the proposed power management strategy..
Gait Generation of Humanoid Robot Based on Analysis of the Human's Gait
Authors: Wu Chang Wei , Deng Hua
Published: February 2014

In this paper, a method to generate the humanoid robots gait intelligently is put forward to solve the problem of poor performance of robot walking. The key idea in this proposed method is to adapt the transmutative humans gait to robot walking. Firstly, the character of the humans gait is acquired by researching a mass of gait data. Then, the typical gait signal is obtained which can be used to generate various gait signals. Finally, this method is proved to be effective by comparing the nature signals and the signal which is obtained by this method.
DFT Investigation of Substitution Effects on the Electronic Properties of Perylene Bisimides Derivatives
Authors: Chen Bo Wei , Xu Ye Wei , Zhang Lin
Published: February 2014

Perylene Bisimides Derivatives (PBIs) are typical semiconductor materials. The electronic structures of PBIs were successfully investigated by density functions theory (DFT). The computational results were in the good accordance with the experimental UV-vis spectra. Additionally, the electronic structure and the variational UV-vis absorption spectra of PBIs were explained.
Study on ECG Signal Wavelet Denoising Algorithm Based on the MSP430 Platform
Authors: Zhao Zhi Qiang , Fu Min Jie , Chen Yong Hui , He Chun Lan , He Jian Jun , Pang Yu , Li Guo Quan , Lin Jin Zhao
Published: February 2014

A novel ECG filtering algorithm was researched, which was suitable for the MSP430 platform. Several ECG signal wavelet denoising algorithms were simulated on matlab to compare their filtering effect. The mexican-hat wavelet denoising algorithm can get a better effect on filtering of ECG signal (No. 203 data from the MIT-BIH ECG database). The time complexity of the algorithm is O(n2), and the SNR can also be up to 66%.
Research of Detecting System on Aneroid Capsule of Height Control Module of Automatic Unlocking Device
Authors: Wang Yu Jun , Wang Li Jie , Zhou Zhen , Qing Yong , Yin Jin Ying
Published: February 2014

Function detecting method on height control module of automatic unlocking device for parachute are explored, principle scheme and framework of the function detecting system for height control module are developed. Intelligent testing method for displacement of aneroid capsule that is the most important key component in the height control module of automatic unlocking device is put forwarded. Displacement sensor based on differential transformer is adopted to acquire the displacement information of the aneroid capsule. Sensor testing circuit and the signal processing circuit are designed. In order to make the high altitude simulation test of displacement variability of capsule stack, experimental chamber of pressure control and test based on SCM control technique is developed, furthermore, experimental data of pressure and displacement are analyzed and processed. It is shown that accuracy of displacement is lower than 0.05mm, and pressure resolution is controlled within 0.06hPa. The detecting system can be used for reliability test for height control module of Automatic Unlocking Device, and the testing and controlling methods above can be also applied for displacement and pressure measurement of other similar mechanical components.
Vectorization Algorithm of Optics Contact Angle Image Based on VB
Authors: Sun Yi Ming , Kou Zhi Min , Xie Xia , Zhao Xi Po
Published: February 2014

The bitmap of contact angle image collected from optics contact angle system was processed on Vectorization with step-scan method. Then, the outline curve of image was got with sample`s curve-fitting. The precision of contact angle which was calculated from that curve compared with out of vectorization increased greatly. Moreover, it could edit to the image expediently.
The Study on Main Nutrients Uptake Kinetics by Three Species of Algae
Authors: Yuan Chun Ying , Han Xu , Cui Qing Man
Published: February 2014

Under laboratory conditions, the absorption law of three kinds of nutrients by three species of algae was investigated, the results showed that: the concentration of nitrate nitrogen, ammonium nitrogen and activated phosphate in the culture medium reduced with the extension of time. Enteromorpha intestinalis,Sargassum fusiforme and Sargassum thunbergii showed the highest uptake for nitrate nitrogen, ammonium nitrogen and activated phosphate, respectively;S. fusiforme, E. intestinalis and S. fusiforme showed the lowest uptake for nitrate nitrogen,ammonium nitrogen and activated phosphate, respectively. It illustrated that macroalgae could effectively reduce nutrients from the surrounding water.
The Circuit Design on Thermostat Control of Solar Water Heater's Water Temperature
Authors: Song Li
Published: February 2014

This paper designs a new control scheme of solar water heater. The main designs are power supply circuit, water temperature display circuit, and mixed water temperature detection circuit. The system is simple and effective with low cost, which has accurate control of temperature and can show the actual temperature of the water heater. By automatically testing the temperature of the water heater, it has the self-check function of adjusting temperature, and keep thermostat temperature.
A Novel Three-Phase Three-Level Inverter with Asymmetrical Legs
Authors: Wei Jin Cheng , Huang Ke , Qiu Xiao Chu , Huang Rong Rong
Published: February 2014

A novel three-phase three-level inverter circuit with asymmetrical legs is proposed. The new prototype is very effective and efficient for improving the quality of the inverter output voltage. Firstly, the structural parts of the inverter are briefly described, then switching strategy and operational principles of the proposed inverter are explained and operational topologies are given. The proposed topology reduces the number of switches, losses, installation area and converter cost. Finally, the simulation and experimental results are provided to validate the effectiveness and advantages of the proposed configuration.
An Improved Physical Downlink Control Channel De-Resource Mapping Method in Long Term Evolution Systems
Authors: Wang Dan , Xu Wen Wen , Luo Jia
Published: February 2014

In TD-LTE (Time Division-Long Term Evolution) system, Resource Element Group (REG) is the unit of de-resource mapping for Physical Downlink Control Channel (PDCCH), due to the reference signal should be considered, which lead to the large calculation. To solve this problem, a modified method is proposed in this paper to reduce the cycles of de-resource mapping. Calculation and simulation reveal that this scheme can reduce the calculation significantly. At the same time, the feasibility and effectiveness of this modified method have been verified.
LFSR Multi-Step Parallel Update Technology Utilizing Divider Circuit
Authors: Li Hong Yan
Published: February 2014

In this paper, operation needs and characteristic of LFSR multi-step parallel update technology based on divider circuit design are analyzed. LFSR status switch parallel update principle based on division and serial input parallel update principle are studied to solve multi-step parallel update data generation of LFSR utilizing division. Through hardware implementation and performance analysis, the hardware circuit using LFSR multi-step parallel update operation principle based on division has some advantages, such as more flexibility and high cipher operation performance. It is a better LFSR multi-step parallel update operational model.
Research on the Continuous Speech Feature Extraction Method for Different Noise
Authors: Liu Wei , Sun Yi Ming , Liu Yan Xiu
Published: February 2014

We propose a noise-robust continuous speech recognition (CSR) method for modeling and recognition. In recognition, we divide the continuous speech vectors to segments using proposed algorithm, then use DRA based on the segments for recognition. The proposed method efficiency is studied for noisy environment. DRA decreases the difference between the model and recognition continuous speech vectors. The new algorithm focuses on adjust the vectors by using different maxima in different segments. Segment-based DRA algorithm can make noisy speech feature vectors closer to the model. The average recognition rate has been improved at different noise and SNR conditions.
The Theory Investigation for the Antioxidant Activity of Phloretin: A Comparation with Naringenin
Authors: Yan Ming Xun , Gong Jin Dong , Shen Ping , Yang Chang Ying
Published: February 2014

Density functional theory (DFT) calculations, based on B3LYP/6-311G (d, p) basis set, were performed to evaluate the OH bond dissociation energies (BDEs) for phloretin, compared with naringenin, in order to assess the contribution of hydroxyl groups at different position to the radical-scavenging properties. It is indicated clearly that A6 OH is determined as the weakest O-H bond, give rise to the smallest BDE, 73.98 kcal/mol. BDE of B4 OH decreases 2.5 kcal/mol in benzene, very close to that of A6OH, indicated that B4 OH group is also mainly contributed to the reaction with free radicals, especially in non-polar environments.
Design of Perimeter Security Monitor System
Authors: Song Fei Fei , Zhu Bin Jie
Published: February 2014

Perimeter Monitor system uses multi-sensors to collect environment information, Hundreds of software modules inside the system core will handle the sensor data, make decisions and give out warnings or alarms. Reliability and performance matter a lot in this kind of system design, while sensors and software modules upgrade frequently, extensibility is also a key factor. In this paper, we introduce service bus principle into the design of monitor system, making a real-time, reliable and extensible perimeter security protection system.