bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Simulation of Photoelectric Detection Circuit for Microfluidics Chip
Authors: Ren Ming Yuan , Tian Li , Wang Wei , Liu Xiao Wei , Mao Zhi Gang
Published: August 2013

This paper presents a photoelectric detection circuit for microfluidics chip. The proposed photoelectric detection system can reduce noise and increase sensitivity. It is consist of pre-amplifier, ac-amplifier and band-pass filter. The transfer function of photoelectric detection circuit is introduced. The circuit implementations and simulation results are given. The proposed photoelectric detection circuit is suitable for integrated microfluidics chip.
An End-to-End Traffic Estimation Algorithm via Multifractal Wavelet Model and Principal Component Analysis in Smart Grid
Authors: Guan Song , Li Yue Hua , Wang Ling , Meng Fan Bo
Published: August 2013

In this paper, we study the problem of end-to-end network traffic estimation in the electric power communication network. Based on principal component analysis and multifractal wavelet model, we propose an effective and precise approach to estimate each origin-destination pair. Numeral results state that our method can capture the changes of end-to-end network traffic accurately in electric power communication network.
Precise Driver-Side Equalization of Capacitive Coupling Connector
Authors: Jiang Dong Chu , Li Yu Shan , Qu Yong Zhe
Published: August 2013

Capacitive coupling connector subjects to excessive inter-symbol interference with the increasing of signal transmission rate. To solve this problem, a driver-side equalization scheme is proposed, and the calculation method of precise equalization ratio for this scheme is also given. The equalization scheme is implemented through select appropriate equalization ratio to increase high frequency components of signal and reduce the low frequency components of signal at the driver-side at the drive-side. It can reduce the inter-symbol interference and improve pulse magnitude effectively. Simulation and calculation results show that the equalization scheme can increase the pulse amplitude in receiver-side, eliminate inter-symbol interference and improve signal transmission rate greatly.
Speech Emotion Recognition Using Multiple Discriminant Analysis and Gaussian Mixture Model
Authors: Bao Yong Qiang , Zhao Li , Huang Cheng Wei
Published: August 2013

In this paper we studied speech emotion recognition from Mandarin speech signal. Five basic emotion classes and the neutral state are considered. In a listening experiment we verified the speech corpus using a judgment matrix. Acoustic parameters including short-term energy, pitch contour, and formants are extracted from emotional speech signal. Gaussian mixture model is then adopted for training the emotion model. Due to the data challenge in GMM training, we use multiple discriminant analysis for feature optimization and compared with basic Fisher discriminant ratio based method. The experimental results show that using multiple discriminant analysis our GMM classifier gives a promising recognition rate for Mandarin speech emotion recognition.
Terminal Design of the Intelligent Data Acquisition System Based on USB Interface
Authors: Wang Gui Juan , Cheng Xiao Hui , Wang Zuo Xun
Published: August 2013

In this paper, the design of data acquisition system of intelligent community based on USB interface is developed, the method and process of design scheme, a set of data acquisition system composed of the United States of America Cygnal company's C8051F320 chip on the development, and proposes the implementation, through the practice has proved the feasibility of the scheme.
Research on Application of Communication Technology in Distribution Grid
Authors: Cheng Xiao Hui , Wang Zuo Xun , Liu Yi
Published: August 2013

The distribution grid communication network is an important part of electric power communication system. But it has became a limit of distribution network for the absence of effective communication method. This paper first introduces the characteristic and information requirement of smart distribution network, then makes a deep research and comparison on the communication technology such as PONWireless Network and PLC. Finally it presents a technology application scheme and system structure of distribution communication network.
Time Domain/Frequency Domain SAFT Imaging in Thin-Diameter Rod
Authors: Zhao Gao Yuan , Lu Chao
Published: August 2013

The ultrasonic flaw reflected signal of the thin-diameter rod was acquired by the general ultrasonic C-scan testing device. And synthetic aperture focusing technique be used in ultrasonic imaging of thin-diameter rod. Respectively, Comparing B-scan imaging and Conventional synthetic aperture focusing technique imaging as well as Frequency domain synthetic aperture focusing technique imaging . The final results show that both time domain and frequency domain synthetic aperture method could obtain a higher signal-to-noise ratio and testing resolution.
Application of HSMM on the State Recognition for Diesel Engines
Authors: Huang Qiang , Cheng Wang , Ding Shi Feng
Published: August 2013

It is significant to identify the running-states of diesel engines for ensuring its running stability, fuel economy and emission behavior. Vibration diagnosis is an on-line prognostics and diagnosis technique by picking-up the frequency characters of the vibration signal on the diesel engine. In the paper, combining with the wavelet noise reduction and character extraction with varying scales, the Hidden Semi-Markov model (HSMM) is built by the example of the inlet valve abrasion to recognize the running-states effectively. According to experiment and simulation researches, it indicates that the identification veracity is 96.9% in the 160 test samples after training the HSMM with 120 training samples. This state recognition method is satisfied for the engineering demand, and it can be applied to vibration analysis for other complex machineries.
Research of Extracting Information about Reservoir Logging Signals Based on Chaos Characteristics
Authors: Nie Chun Yan , Li Rui , Zhang Wan Li
Published: August 2013

The mechanism of logging signals generating was researched. In the same time, correlation dimension, largest Lyapunov exponent and approximate entropy of chaotic characteristics were extracted. On this basis, chaotic characteristic parameters were applied in processing, analysis and interpretation, try to find chaotic characteristics of different of reservoirs for example oil, water layer and the dry layer. The results showed that chaos characteristics in different reservoir is different, therefore, we can distinguish the different natures of reservoirs by extracting chaos characteristics.
Source Camera Identification Based on In-and-Inter Channel Traces
Authors: Xie Yong Jie , Bao Yi , Tong Sen Feng , Yang Yu Hao
Published: August 2013

Source camera detecting, which is about establishing whether or not the images of interest are taken by the same camera, is a challenging problem. Most CFA(color filter array) interpolation algorithm characterize the feature of camera which take the image. In this paper, we propose an improved algorithm. Instead of using inter-channel demosaicking/color interpolation traces, we first extract four in-and-inter-channel variance maps, respectively, and then extract the shape, similarity and difference features of maps for camera model identification. The experimental results show that the method had significantly improved the accuracy rate of source digital image identification.
A New Method of Scalable Image Compression Coding
Authors: Yang Yan
Published: August 2013

This paper presents a new method of scalable image compression coding based on the wavelet transform. This method delimits the region of interest of the original image, and give a high-quality encoding to this region and a rough encoding to the rest. The result shows that in the limited memory space, this algorithm provides the coarser reconstruct image to satisfy the basal subject quality. Using this method, we can give a high quality encoding to the region for interest.
The Design of a LED Illumination Control System Based on ARM, Infrared Technology and ZigBee
Authors: Yu Min Li , Bi Yan Jun , Meng Ling Gang
Published: August 2013

The design of a LED illumination control system based on ARM, infrared technology and ZigBee is described. With the core of S3C44B0X and the infrared sensor collecting the temperature information, the system uses ZigBee technology to do real time monitoring. Through the experiment, the system can make the safe, real time and effective control. It is meaning for the development of the future LED illumination.)
A New Low Complexity Uplink Multiuser MIMO Detecting Algorithm
Authors: Ma Jun , Wang Da Ming
Published: August 2013

In multiuser MIMO uplink communications, it is necessary to design linear schemes that are able to suppress co-channel interferences (CCIs). In this paper, we propose a linear block QR decomposition (BQRD) which transforms the multiuser channel to a block upper triangular structure based on Gram-Schmidt orthonormalization and can obtain more diversity gain than traditional BD. And a optimal ordering criterion is proposed at last to do full study of BQRD scheme. Simulation results show that the BQRD with the optimal ordering proposed achieves much better performance than the non-ordering one.
Structural Analysis and Optimization Design of Motor Hanging Seat Structural Based on Pro/ENGINEER
Authors: Gao Shun Xi , Zhao Shu Guo , Zhao Li Fang
Published: August 2013

This paper establishes a parametric model on the motor hanging seat structure by pro / ENGINEER software, and then optimizes the structure of the hanging seat by the weight of the hanging seat as the objective function. Taking into account the stress and displacement constraints in the optimization process, the weight of the hanging seat is greatly reduced after being optimized. It is practical significance to save a large amount of raw materials for the mass production and to reduce production costs and create higher economic efficiency.
The Design of Data Transmission Device Base Public Network
Authors: Huang Jian Long , Wang Zhong Feng , Li Li Gang , Wang Ying Nan , Ge Wei Chun
Published: August 2013

Based on the rapid development of communication technology and a large area of the base station of the public network being laid, which prompting the data transmission device development that base on the GPRS wireless network. This paper describes the hardware design of a data transmission device which based on GPRS mobile communication technology. Extended remote data transmission via GPRS mobile communication technology applications, and has broad application prospects.
Design of RF Control System Based on TD-LTE
Authors: Wang Hua Hua , Lv Nan , Li Xiao Wen , Yu Li Cheng
Published: August 2013

This paper explains a method to design a RF system using FPGA and DSP. After DSP sending RF circuit controlling words to FPGA through its EMIF interface, FPGA then imitate the behavior of the EMIF interface to receive these information. The received data will be used to configure the RF circuit correctly. Data information will be sent to FPGA in the same way by DSP when RF circuit is configured completely, Then FPGA sends baseband data to RF circuit which convert it to RF signal. Through simulation, synthesis, plate level verification, and online debugging, this design has realized the correct RF control system, which has been used in the development of RF conformance test instruments.
A Method of Hand Signal Segmentation Based on YCbCr Space and Background Difference
Authors: Hong Duan , Luo Yang
Published: August 2013

This paper proposes a method of segmentation of hand signal, based on the skin color model in YCbCr space and background subtraction under complex background. This paper discussed the reasonable threshold selection of Cb, Cr in the skin color model and the segmentation selection of skin area combining the background segmentation. Finally, an inequality of hands outline feature is proposed to complete the division processing of the palm part of the area of skin. Experiments show the accurate segmentation of gesture under a complex static background.
Fuzzy-PID Control and its Stability Analysis of Large Time-Delay Nonlinear Systems
Authors: Zhao Yu Chi , Liu Jing
Published: August 2013

Aiming at a kind of state unpredictability of the fuzzy input large time-delay systems, the author designs a fuzzy observer with the application of Parallel Distributed Compensation (PDC), puts forward the PID control method based on the fuzzy observer, and provides a new sufficient condition which guarantees the asymptotic stability of fuzzy large time-delay system. With the employment of generalized Lyapunov function and linear matrix inequality, this paper proves the asymptotic stability of fuzzy input large time-delay systems and offers the separation design algorithm to control and observe gain matrix. The simulation results of the experiment further verify the effectiveness of the methods and conditions raised in this paper.
Study of the Effect of High-Pulsed Electric Field Pretreatment on Hot Air Drying Rate of Scallop Muscle
Authors: Bai Ya Xiang , Hu Yu Cai , Yang Ya Xin
Published: August 2013

To improve the drying rate and to reduce the energy consumption of aquatic product, scallop muscle were treated with high pulse electric field (HPEF) in different frequency, and different voltage. The hot air drying rate of treated scallop muscle was determined, meanwhile, several quality parameters such as the shrinkage and rehydration rate of samples with pretreatment were determined to compare with those of untreated samples. The results indicated that the drying rate of scallop muscle can be improved by HPEF pretreatment without affecting the quality, and 22.5kV for pretreatment voltage and 50Hz for pretreatment frequency is the optimum treated parameters.
The Research on Pain Mechanism Based on the Spectrum Analysis of EEG
Authors: Tong Ji Jun , Kang Yan Qin , Zhang Guang Lei , Liu Jin , Cai Qiang
Published: August 2013

Pain is one of the most important sensations in daily life, it is necessary to get the essence and mechanism of pain in pain treatment and control. In this article, the pain was induced through injection of angelica on the left shoulder of 12 volunteers, as placebo-control stimulation, the isotonic saline was injected. And through the spectrum analysis of EEG, the EEG feature, the power percentile of δ ,θ, α, β were extracted during the experiment to study the modulation effect of pain on brain information and central mechanism. The research demonstrated that the δ band energy ratio increased and the θ, α, β band energy ratio decreased after pain stimulation, though the activated areas were not strictly same, they mainly located on the left frontal cortex, left temporal cortex, left parietal cortex, occipital cortex. It indicated that these areas were modulated significantly by pain stimulation.
Effect of Nanocalcium Oxide Addition on the Cast Microstructure of Pipeline Steel
Authors: Wang Jian Ming , Liu Yan , Ding Long Xian , He Chun Lin
Published: August 2013

This experiment takes the X80 pipeline steel as the research object, the thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding nanocalcium oxide into the steel with the method of carrier dispersion addition. The effect of nanocalcium oxide addition on the cast microstructure of X80 pipeline steel was analysed. The results show that the cast microstructure is consist of the ferrite and a small amount bainite. And the bainite is distributed at the boundary of the ferrite grains. When adding 0.02 wt% nanocalcium oxides, there is more bainite in the microstructure by contrast. The number of the acicular ferrite significantly increases in the cast microstructure, and the grains become more fine and uniform. Simultaneously, the granular bainite is uniformly distributed at the grain boundary and edge of the ferrite.
Testing Research of Physical and Mechanical Properties of Snows on Railroad Switch
Authors: Mu Cun Yuan , Feng Bo , Sui Ming Ge , Wang An Min
Published: August 2013

The conservation status of the railway turnout junctions were analyzed, the hardness, density, compressive strength tests of snow squeezed by railway turnout junctions were studied, thus reaching a conclusion that different quality of snow owns different hardness and densities. For new snow ( or loose snow) whose density ρ = 0.3g/cm2, snow compressive strength is small; when the compacted snow density ρ > 0.3g/cm2, the regulation of snow compressive strength should be the snow compressive strength improve with decreasing temperature, while the denser the snow density is and the lower ambient temperature is, the faster the snow increase compressive strength. All these provided the snow quality parameters for the design of railway turnout junction snow cleaning machines and tools.
Promoting Hotel Managerial and Operational Level with New Technology
Authors: Li Yun Peng , Xie Yong Qiu , Huang Chao
Published: August 2013

the worldwide application of IT, typically represented by computer technology, has laid a solid foundation for the hotel Informatization. At present, most of guest serving and receiving business are processed with IT. But still, there is some inadequacy in the controlling system of distribution channels. To solve these problems and to meet needs, more and more newly invented technologies are applied in IT-based hotel management. Like internet of Things technology, distribution technology, cloud computing. Presently, in Chinas market numbers of entrepreneurs are committed to try to take advantage of these new technologies in hotel operation and management. But the most important things are to fully consider the applicability of the information technology and to realize of unified and unimpeded information flow. Following are the steps to be adopted: Information standardization and reservation procedure standardization, Hotel networking, Hotel service creation, Application of socialized media, Prompt service and customized service.
The Effectiveness of Public Hospital Governance Model Evaluation and Analysis
Authors: Yang Jian Hui , Zhao Jie , Zhai Yun Kai
Published: August 2013

According to the Balanced Scorecard theory and stakeholder theory, this paper points out that the evaluation of the effectiveness of public hospital management mode should be based on in-house effectiveness and the effectiveness of the operation. Article conducts a further demonstration of the effectiveness of public hospital governance, evaluates and analyzes the effectiveness of public hospital governance model.
The Accounting Information on Construction Enterprises
Authors: Zhu Wei , Cao Yu Ping
Published: August 2013

In the composition of China's national economy, the construction industry can be regarded as the pillar of industry, so the development of construction enterprises can't be ignored by any level of national economy. To achieve maximum economic efficiency, enterprises should strengthen the internal management of construction enterprises, control the construction costs effectively, and promote its profit margin by meaning of accounting information, which is an important issue in the internal management of construction enterprises today. This article is a brief introduction of the practical meaning of accounting information, and there is appropriate analysis and discussion about a specific setting of accounting information and measures on that basis.
The Risk Management Framework of Aero-Product Development Based on PMBOK
Authors: Wang Wei , Wu Jia Duo , Wang Dong Yu
Published: August 2013

With the enhanced complexity of the development process of Aero-Product, the risk of it is increasing rapidly. Therefore, it is of great significance to implement risk management in the process of Aero-Product development. As the core of Risk Management, its framework is of great importance to the effect of Risk Management.
According to the characteristics of Aero-Product development process, a Risk Management Framework based on PMBOK is proposed in this paper, which will become the foundation of the Aero-Product development risk management.
Analysis of the Application of Coalfield Geological Information Resources Management Based on GIS Technology
Authors: He Qing Song , Zeng Fan Gui
Published: August 2013

In today's society, it is the era of information explosion. With the advent and rapid development of computer technology, it needs to solve the problem that is to further management for the knowledge discovery and space information, at the same time the problem is a hot and difficult problem in GIS. According to some geological information resources management, response speed and planning ability are relatively poor in the process of emergency treatment, the GIS technology is introduced, which palys an important role in the field of geological information resources management. From the functional comparison perspective starting of GIS technology and the geological information management system, the application of GIS technology carried out analysis in the field of coalfield geological information resources management, it proves that GIS technology has an important role in the geological information resources management, and hopes the relevant analysis and research, to promote a role in the similar field of GIS technology.
TH6213 CNC Boring and Milling Machine Spindle System Thermal Equilibrium Analysis
Authors: Liu He Jian , Chen Zai Liang , Xu Ya Xin
Published: August 2013

The thermal deformation of machine tools has a great influence on machining accuracy. Studied on thermal effects of TH6213 CNC boring and milling machine spindle system, bearing heat grows with load and boring spindle extending length, and brings about a changeable temperature difference, which is hard to reduce. A subsection cooling scheme was proposed to reduce the spindle system temperature as well as the temperature difference to reduce the thermal deformation effects.
Research and Design on B2B E-Commerce Supply Chain Management System
Authors: Tan Hui
Published: August 2013

This paper introduces a mature and complete design idea and function structure of B2B E-commerce supply chain management system based on intermediary, wherein the system is mainly based on the front end E-commerce trading system and the back end business support system, and can be simultaneously integrated with such systems of external partners as logistics distribution system, online payment system, SCM system, and ERP system. The system has solved the problem of information disjunction between the upper and downstream enterprises in conventional supply chain management, and realized efficient, reliable and flexible integrated application of every module within the entire e-commerce supply chain management system.
The Ideological and Political Education Quality Assessment System Based on Multivariable Decision-Making
Authors: Xue Bo
Published: August 2013

The multivariable decision-making model has been verified based on the results of the multiple-choice questionnaires. According to the emphasis of Suggestion on further Strengthening and Improving Ideological and Political Education for College Students, which was released by the Central Committee of the Communist Party of China and the State Council in 2004, the Ideological and Political education system for college students should be the key indicator to assess the quality of higher education. In this paper, we give the ideological and political education quality assessment system based on multivariate decision-making. Decisions in service operations are complex since they involve various interdependent decision-makers (agents) at different hierarchical levels.
Research on CNC System of Line Contact Machining
Authors: Han Ju , Lei Li Qun , Liu Xi Feng
Published: August 2013

The paper analyses the method of line contact machining which is for side milling. And researches the all-software CNC based on line contact machining which running on Win NT OS. The system controls the side-surface of the cutting tool to process the whole side of work piece at one time. Whats more, the system includes a graphics automatically programming system based on line contact of machining.
Based on Single Neuron PID Control of Vehicle Active Suspension System
Authors: Liu Xiao Feng , Xie Xin Hua
Published: August 2013

Relative to the passive suspension, automotive active suspension car driving more ride comfort and stability, has a vital role to further improve the performance of the vehicle. For such a typically complex active suspension system research, the key issue is the selection of control strategies. The problems in the currently active suspension control strategy, the principle of a simple, effective, this paper, a single neuron PID control strategy used in the automotive active suspension system. The results show that compared with other control strategies, single neuron PID control strategy is reliable, has more advantages.
Electric Servo Loading System Applied to Flight Simulator
Authors: Hong Liu
Published: August 2013

Flight simulator control loading system is an important part of the flight simulator, and it provides operating force people feeling system for Pilots. This paper introduces the working principle of digital control load system, and describes in detail the simulation and application of the electric servo loading system in the flight simulator. After tested the system has reached the ideal simulation results.
Research on Analog Simulation of Automobile ABS Based on Unigraphis Software
Authors: Zheng Jun Long
Published: August 2013

Many traffic accidents are caused by automobile brake problems, human consciousness is difficult to accurately control the car's emergency braking in emergency situations, which requires a special automotive braking system ABS that assists the driver to prevent accidents. ABS system goes through the way of pumping to brake, it can prevent automobile from slipping phenomenon due to tire locked die. The automobile ABS system' working principle and its performance are studied, the first part elaborates the working principle and its work flow of ABS system; the second part establishes the EBD control mathematical model of ABS system; in the third part, the use of Unigraphis software carries out simulation for vehicle ABS, automobile brake and vehicle ABS integrated model are set up by Unigraphis software powerful modeling functions, using the calculation module calculates the change of temperature as well as braking force in process of braking, finally to obtain the system temperature of ABS system that is small in the process of braking, however the braking force is a change of curve, so as to prevent slipping phenomenon caused by the tire locked die, providing the theoretical basis for the design and research of ABS.
Exact Linearization Algorithm of Tight Coupling Nonlinear System Based on Differential Manifold
Authors: Qian Hua Ming , Fu Zhen Duo , Chen Liang , Ning Xiu Li
Published: August 2013

Dealt with the short precision the traditional Taylor series expansion induced and shortage that the system mechanics is hard to match with the exact linearization conditions, a novel exact linearization algorithm of tight coupling nonlinear system based on differential manifold to the missile attitude control system is proposed. A dimension expansion method is proposed, the method solves the problem that the input and output dimensions can not meet the exact linearization conditions; the algorithm application range is widened. Using the principle of the differential manifold, the missile velocity and height information are selected as the measure output, the exact linearization of the missile attitude system is derived based on the diffeomorphism transformations. The simulations are performed on the missile attitude control system. Simulation results show that the effectiveness of the algorithm proposed.
Nonlinear Rectification for Capacitance Method Measuring the Moisture of Green Sand Based on Functional Link Neural Network
Authors: Shi De Quan , Gao Gui Li , Dong Jing Wei , Wang Li Hua
Published: August 2013

In order to solve the nonlinear output/input problem of the capacitance method measuring the moisture content of green sand, a nonlinear compensation is added into the measurement system and the neural network is used for nonlinear rectification. Based on introducing the principle of non-linear compensation, a functional link artificial network with multi-input and single-output is constructed. In the network, the output voltage of capacitance moisture sensor is taken as the input and the moisture content of green sand is taken as the output. The data samples obtained in laboratory are used to train the network, and the dynamic rectification model is got. The experimental results show that the maximum difference and relative error of the moisture content are ±0.09% and ±1.85% after nonlinear rectification by the functional link neural network, and it is significantly better than those of the least square method.
Design of General Agricultural Wireless Monitoring System Based on ZigBee
Authors: Yao Qi Guo , Liu Yu Liang
Published: August 2013

The ZigBee which was adopted low-power wireless communication technology was used to design a multi-parameters monitoring system according to agricultural monitoring characteristics. Following the design concepts of generalization and modularization, the sensors and functional modules could be combined configuration, thus the system was versatility, flexible and convenient. Low-power communication protocol and solar charging technology were adopted to extend the life of power supply. This system could be widely used for automatic monitoring in facility agriculture and other agricultural places.
Intelligent Diagnosis and Calculation of Electrical Insulation Fault for Smart Power Grid
Authors: Liu Ying , Wang Jun , Zhang Zhou Jing , Liu Nian
Published: August 2013

We make an approach to the intelligent diagnosis and calculation of electrical insulation fault for smart power grid. By the electric field calculation method and the online detecting method, the insulation diagnosis model is presented in this paper. This monitoring system can monitor the leakage current of outdoor insulators effectively, and this system can make use of modern computers and communication technology to deal with these real time signals. Therefore, we use the results to increase the ability and the condition of working for the smart grids.
Design and Implementation of Multi-Directional Solar Irradiance Measurement System Based on DSP
Authors: Li De Jun , Hu Zhi
Published: August 2013

This paper introduces the design of the all-round solar irradiance measurement system which take the DSP processor as the core. The data which is collected from the system is used to analyze the photovoltaic power generation efficiency in the building integrated photovoltaic (BIPV). BIPV has become an important development direction of the current solar PV technology. The core is the solar PV modules which combined with the building exterior. The BIPV require the installation of PV modules must comply with the appearance of the building, which led to the solar panels cannot be installed in the azimuth and elevation where the PV modules can generate the maximum power in theory. So it is a good practical significance to assess the power generation efficiency of solar photovoltaic modules in the building.
Welding Defect Classification of Ultrasonic Detection Based on PCA and KNN
Authors: Qi Ai Ling , Wang Jing Fang , Wang Frank , Idachaba Unekwu , Akanmu Gbola
Published: August 2013

Aiming to problems of welding defect classification in the ultrasonic detection, according to the characteristics of welding defect, a classification method based on PCA and KNN is proposed in order to solve the problem of ultrasonic testing signal feature extraction and defect recognition. For the impact of the redundant attributes of feature extraction on the classification accuracy, in this paper, an ultrasonic flaw feature extraction algorithm based on PCA is proposed. Ultrasonic flaw intelligent classification is always a difficult problem in NDT. KNN algorithm is proposed to classify the different defects. Compared with BP algorithm, experiment results show that the model based on PCA and KNN can get stable classification results, high accuracy, and can effectively improve the classification efficiency.
Monitoring System of Gate Control TWT Radar Transmitter
Authors: Wang Liu Jun , Liu Chang Jin
Published: August 2013

Gate control TWT damaged easily in high voltage and high frequency work environment of radar transmitter. The development stages of the monitoring system core technology for radar transmitter experienced relay, single-chip computer, embedded industrial computer and programmable logic controller (PLC). Embedded industrial computer and PLC monitoring system is commonly used now, and this paper gives a relatively complete system of the above. Using the power monitoring method for key parameters of gate control TWT for indirect acquisition and monitoring is proposed in this paper. Provide reference for designing a reliable, stable and efficient monitoring system of radar transmitter.
A Method for Monitoring the Variations in the Upper Airway of Individual OSAHS Patients by Observing Two Acoustic Feature Tracks
Authors: Qian Kun , Fang Yu Zhuo , Xu Hui Jie
Published: August 2013

Monitoring the variations in the upper airway (UA) for individual Obstructive Sleep Apnea/Hypopnea Syndrome (OSAHS) patients by utilizing acoustic signal analysis methods is significant to research and develop convenient equipment to overcome the invasive airway pressure measurements. It is noticeable that acoustic features like formant frequencies and power ratios had achieved good results both on diagnosing OSAHS and revealing the relationship between properties and anatomical structure. We adopted the first formant frequency (F1) and power ratio at frequency of 800 Hz (PR800) as target values to observe the tracks of them in snore episodes before an apnea/hypopnea event, which could help doctors to know the structure variations in UA for OSAHS patients. Results showed that the tracks of the two acoustic features have a good performance on demonstrating the reasonable theoretical hypothesis. If we get enough prior knowledge by large scale of experiments and practices, we can even use the tracks of F1 and PR800 to find some more detailed information of UA like observing the electrocardiogram in cardiac healthcare and monitoring.
An Efficient Key Management Protocol for Multi-Microgrid Distribution System
Authors: Ma Yong Hong , Cui Dan Dan , Wang Xiu Yu
Published: August 2013

This paper studies network security of the multi-microgrid distribution system (MMDS) composing of a large number of distributed power-islands. First, a hierarchical communication model for MMDS is designed . Then we analyze the security vulnerabilities. Finally, proposes an efficient secure key management protocol by combining Iolus framework and logical key hierarchy (LKH).
Experimental Performance for a Universal Single Mooring Platform Applied to Wave-Energy Conversion System
Authors: Lee Hisen Hua , Wu T.J.
Published: August 2013

For an offshore platform applied to wave-energy conversion system, in order to catch the maximum waves to generate more powers, similar to wind-energy power generators, a range of angles for the devices normal to the propagating direction of incident waves is required, particularly when the power converting system has directional preference. A single mooring system would allow the offshore wave-energy conversion system to turn freely in accordance to the action of strong directions of propagating waves and in this way, most energy induced from the incident waves can be caught and converted into reusable powers. The aim of this study is to find the efficiency of single-moored platform applied to a wave power converting system through an experimental test in the water tank.
Damage Analysis of Naval Gun Guided Projectile to Typical Anti-Ship Missile in Proximity Mode
Authors: Wang Cheng Cheng , Xie Xiao Fang , Sun Tao , Wang Yan
Published: August 2013

Naval gun guided projectile is an important direction of the development of naval ammunition, which can effectively enhance the capacity of firepower support and anti-missile. Penetration damage of naval gun guided projectile to typical anti-ship missile in proximity mode is researched in the paper. Damage of the two different damage elements (fragment and discrete rod) to warhead cabin of missile is simulated with ANSYS/LS-DYNA finite element analysis software and analyzed. Its useful to the study of the further model of vulnerability analysis of whole anti-ship missiles and offer theory reference to enhancing the damage effect of naval gun guided projectile.
Study on Topology Optimization Algorithm of Power Communication Network Based on Complex Network Theory
Authors: Cui Zhen Hui , Yang Ting , Li Lin Chuan , Cao Zhi Heng
Published: August 2013

Based on complex network theory and network topology modeling, this paper analyses the characteristics of Power Communication Network. The simulation apply two indicators that is connectivity robustness and network performance function to respectively evaluate the impact of failure for network connectivity and communication efficiency in order to identify vulnerabilities in the network. At last, propose one topology optimization algorithm based on the point referral number to optimize the network structure. The fault simulation analysis shows that the algorithm is effective to enhance the ability of the network against deliberate attacks.
A Self-Tuning Power System Stabilizer Design
Authors: Chen Ping , Jiang Hui Lan , Zeng Kai
Published: August 2013

The traditional power system stabilizer (PSS) usually configures parameters in off-line circumstances and can’t adapt to the variations of power system operating modes well. Based on the prony algorithm, this paper presents a parameter self-tuning PSS. After identifying the system reduced model, it recognizes the real-time low frequency oscillation characteristics of system based on the online prony and uses the dominant mode frequency to complete self-tuning parameters of PSS. The simulation results in IEEE 4-11 system show that the self-tuning PSS based on prony algorithm can adapt to the variations of power system operating modes and restrain low frequency oscillation system better, then improve the stability of the system.
Output Controllability of Buck Converter in DCM
Authors: Li Xiao Jing , Wu Ai Guo
Published: August 2013

In this paper, the model of Buck Converter in DCM is built based on the theories of Hybrid Systems and Switched Linear Systems firstly. Then the output controllability of Buck Converter is studied and its sufficient and necessary condition is given. In the end, the simulation analysis and verification are provided. The research results indicate that the output of Buck Converter can be stabilized at the setting value when the condition of output controllability is satisfied, on the contrary, the output can't be controlled stably.
Optimal Design of Transverse Flux Permanent Motor with Reducing Cogging Torque
Authors: Su Shi Bin , Shi Yi Kai , Han Kang , Yuan Xiao Qing
Published: August 2013

Transverse Flux Permanent-magnet Motor has low speed, high torque density characteristics. In order to reduce cogging torque, a novel topology model of transverse flux motor has been designed for electric vehicle wheel in this paper. Its remarkable characteristic is sufficient to reduce the cogging torque, raise motor output torque and raise utilization ratio to the space in electric vehicle wheel. The cogging torque of the prototype model is calculated through the three dimensional finite element analysis methods. The result shows that the theoretical research method is effective and topology model rationality.
Research on Anti-Jamming Technology of Variable Adjusting Speed System
Authors: Zhou Jiu Yan
Published: August 2013

In order to analysis the EMC(electro magnetic compatibility) of variable adjusting speed system, This paper firstly introduces the inverters jamming source, Then analyzes the jamming dissemination way, Finally gives the countermeasure of frequency conversion timing system anti-jamming.
Design of 5.1 Channel Audio System Based on Zigbee and PurePath Wireless Technology
Authors: Wang De Sheng , Wang Zhi Chao , Lin Cheng Wu
Published: August 2013

This paper presents a design scheme of 5.1-channel wireless audio system which takes the advantages of Zigbee and PurePath Wireless technologies. It overcomes several disadvantages of traditional wired audio system such as inconvenience of speaker placement, complexity of wiring, low efficiency, etc. This system adopts a star topology structure with a host and six slave machines. System management is based on Zigbee network, and digital audio is transmitted via PurePath Wireless audio link. The CC8530 audio transceiver chips and IEEE 802.15.4 RF chips were adopted as the hardware platform and the Zigbee protocol stack was adopted as the core software. The results show that this method makes the wireless audio system low-cost, low-power and low-complexity. In addition, audio quality and system efficiency are both greatly enhanced.
An Algorithm of the LMS Adaptive Filtering in Linear Canonical Transform Domain
Authors: Zhang Yan Hong , Zhao Heng , Li Hui Hui
Published: August 2013

In allusion to the non-stationary wideband signals, a LMS adaptive filtering algorithm based on linear canonical transform is proposed. In this method, the signal is first transformed to linear canonical transform domain. By using linear canonical transform and selecting appropriate transformation parameters, characteristics of the transformed signal appear to be stationary narrow-band in the corresponding linear canonical transform domain, and then, the transformed signal is filtered adaptively with LMS algorithm in this domain. Theoretical analysis and simulation results show that the algorithm is not only to solve the problem of extracting and filtering of nonstationary signal, and can obtain better filtering performance.
Alternate Orthogonally Polarization Jamming on ASLC System
Authors: Li Xing Cheng , Zhang Qin
Published: August 2013

Antenna has two response modes of co-polarization and cross-polarization as well as the serious amplitude and phase error, the alternate orthogonally polarization jamming is presented from the perspective of polarization domain according to the processing characteristics of typical open-loop adaptive side-lobe cancellation. The basic idea and principle are introduced and analyzed.
The Principle of Conditional Access System and the Realization of Set-Top Boxes
Authors: Wang Yu Ru , Lan Zhen Ping , Li Ping , Lei Dong Ming
Published: August 2013

Digital TV refers to a system which transforms the traditional analog signal into digital for processing, transmitting and receiving. In order to protect the interests of the operators and ensure the development of digital television, CAS (Conditional Access System) of digital TV uses various kinds of digital technology through the scrambling process of the program, so that only the authorized users can watch the scrambled programs. This paper mainly introduces the principle of CAS in current DTV, as well as elaborates the realization example of the CA running on the STi5105 chip platform and the detailed process from transplant to descrambling successfully.
Joint Selection of OFDM Parameters in Mobile Satellite Communications
Authors: Wang Jia Jia , Li Cheng Mei , Li Bin , Chang Hao , Wu Jian Jun
Published: August 2013

In mobile satellite communication based on OFDM technology, the system performance can’t be optimal if the cyclic prefix (CP) length and subcarrier interval of LTE specification are transplanted into mobile satellite communication directly. In this paper, we analyze the impact of inter symbol interference (ISI) and inter carrier interference (ICI) which are caused by multipath delay spread and Doppler frequency shift separately on system capacity, and derive the optimal CP length and subcarrier interval for GEO, MEO and LEO mobile satellite communication by numeric calculation. Finally, the simulation results show that the OFDM parameters of LTE specification can be used in GEO mobile satellite communications, but cannot in MEO and LEO.
Hydrothermal Synthesis of Zn2(MoO4)(SeO3) and Photocatalytic Applications
Authors: Zhen Yan Zhong , Wang Dan Jun , Fu Feng , Xue Gang Lin
Published: August 2013

A novel mixed metal molybdates, Zn2(MoO4)(SeO3) 1 has been synthesized by a simple hydrothermal process. Samples obtained are characterized using powder and single crystal X-ray diffraction (XRD), transmission electron microscopy (TEM). Furthermore, the photocatalytic performances of samples obtained are investigated for degradation of RhB under visible light irradiation. photocayalysis experimental result has illustrated that the compound exhibits good photocatalysis.
Web Service QoS Matching Research Based on Ontology
Authors: Ma Xin Bing , Zhou Xiao Feng
Published: August 2013

In this article,take into account QoS characteristics comprehensively and build a reliable QoS ontology model. Based on the model,Web service QoS matching will be divided into three stages.Firstly,make a estimation of semantic comparability between QoS parameters of candidate services meeting the functional requirements and the QoS parameters of requirements in QoSIndependent ontology,find candidate services meeting users needs; Then,according to the critical QoS parameters between adjacent services constraints to further refine the matching between the candidate services;Finally choose the maximum service QoS value meeting the user requests in specific areas. So as to improve the efficiency and accuracy of service matching.
A Hierarchical Access Control Scheme Based on Lagrange Interpolation and ELGamal Algorithm with Numerical Experiments
Authors: Chen Tzer Long , Chung Yu Fang , Hong Jian Mao , Jhong Jeng Hong , Chen Chin Sheng , Chen Tzer Shyong
Published: August 2013

It is important to notice that the access control mechanism has been widely applied in various areas, such as on-line video systems, wireless network, and electronic documents. We propose an access control mechanism which is constructed based on two mathematical fundamentals: Lagrange interpolation and ElGamal algorithm. We conduct performance analysis to compare the efficiency of our proposed scheme with that of several related published schemes in both key generation phase and key derivation phase. Our new scheme is proven to be more efficient. It is shown, as expected, a more efficient scheme provides relatively less security and a more secure scheme is relatively less efficient for private keys of the same size.
Research on Framework Structure for Scientific Research Management System
Authors: You Kai He , Li Li Jun , Zhao Mei Zhi
Published: August 2013

Archive management system based on modern information technology as the support, the archives information as management object, the archives work as the core and implement management information system, database design is the core work of the development of archives management system work, this article launches the research from four aspects according to the database design process. First, from the business requirements, functional requirements, performance requirements, such as security requirements for demand analysis; Second, according to the result of requirement analysis, conceptual design using E-R diagram; Third, converting E-R diagram logic structure supported by the database management system; Fourth, for the logic model to determine the storage structure and access method. In this paper, it based on the relational database design, a relational database with full-text database is the development direction of the future.