bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Image Processing Technology in Welds Ultrasonic Testing
Authors: He Jian , Zhu Lian Cheng , Wang Ke Cheng
Published: September 2013

In order to ensure the real-time tracking of weld ultrasonic testing, applied CCD weld image sensor image, through image processing technology, used homomorphic filtering, two value methods to pre-process the image acquisition, extracted image feature information used region growing and linear regression method, and thus determined the edge weld, after A/D conversion, got feedback of the voltage signal position deviation amount, controlled servo motor drive the bracket to move, ensured effective tracking ultrasonic tester. Through simulation, verified the accuracy and feasibility of the image processing algorithm,which got ideal effectused in the practical application.
Adjacency Matrix Based Analysis on a Novel Metamorphic Manual Operation Sugarcane Loader
Authors: Gao De Zhong , Cai Gan Wei , Shi Hui , Pan Yu Chen
Published: September 2013

Sugarcane loader is a kind of agricultural machinery for sugarcane transport. Traditional sugarcane loaders are mostly hydraulic type powered by diesel engine, which is difficult to promote in small producing unit, because of its big size and high maintenance costs. A manual operation sugarcane loader with metamorphic function invented by the research of metamorphic mechanism applied to sugarcane loaders can change its topological structures according to different needs of work tasks. The grabbing and raising task of sugarcane can be done by a single operator action. This paper introduces the source-metamorphic mechanism of the sugarcane loader, as well as the metamorphic ways. Use the adjacency matrix to describe the topology changes of different work tasks and to analysis the principles and characteristics of configuration.
Desalinization Water Treatment Control System Design Based on Mitsubishi PLC
Authors: Yu Ling , Ning Jian Rong , Li Xiang
Published: September 2013

With the development of industry and technology, the need for freshwater increases day by day, the contradiction between the fresh water for production and livelihood is sharpened. An important way to solve the problem is desalinization of the groundwater. In this paper reverse osmosis disposal process of groundwater are used, PLC are used to control electromagnetic valves and water pumps in the desalinization water treatment system and automatic switching state or stop. Using touching screen as man-machine interface, which is more convenient for the operator to know the working stages, and is more facility for desalinization process. The system has many advantages, such a saving energy, high efficiency, more safety, control modes flexible and various, function extension easily. It has great significance in reduce cost of desalinization of groundwater and remission serious lack of the freshwater in some areas of China.
The Structural Design and Kinematic Analysis of Palletizing Robot
Authors: Zhao Yu Gang , Sun Hao , Cai Tian Ci
Published: September 2013

For a warehousing company's requirements, a four-DOF parallel palletizing robot is designed and a new method used to calculate the main structure and analyze kinematics is proposed. The palletizing trajectory is planned according to industrial sites requirements. Finally, based on the results of structural analysis, the workspace is simulated by Matlab. The results suggest that the robot designed is fully content with the requirements of industrial field.
Design and Optimization Based on the Spindle of Automatic Clamping Lathe
Authors: Liu Le Ping , Li Hai Dong , Lin Cong Cong , Gao Qun Qun
Published: September 2013

The article discusses the cause and necessity of the window fillet radius of C1206C which is a kind of bearing ring automatic clamping lathe equipment. The static and modal performance were analyzed by finite element software ANSYS and an value range of the window fillet radius was put forward. The result of this work has an obvious guiding effect on promoting the performance of the product.
The Model Used to Pretect Wetlands Based on Zigbee Technology
Authors: Xiao Jun Sheng , Dai Yu Gang , Xu Tao
Published: September 2013

In this paper, by researching the wireless sensor network, combination of the zigbee wireless communications protocol features,using the Wireless sensor technology to establish the Tibetan wetland protection program. Combine the characteristics of Tibetan areas about wetlands, finally work out a reasonable set of Tibetan wetland model. The model data is obtained through a variety of sensor nodes, using wireless transmit data to Host computer. Host computer use the Socket communication protocol sent to the server. After Server processing ,displayed by Web form.The model have tested int wetlands, and also got a series of data results,and the resul display a number of environmental problems.
Design and Analysis of a Low-Range Torque Sensor
Authors: Wang Liang Liang , Sun Jin Ju , Mei Qin , Cai Hao , Liu Qing Cai , Dong Jing Shi
Published: September 2013

In order to meet the testing accuracy of torque in the test of biological bone tissue torsion behavior, a strain gauge torque sensor based on multi-beam structure is designed. The mechanical model of the torque sensor is given and the parameters of the elastic beam structure have been optimized by finite element analysis. Finally the material of the structure and processing technology are determined and static calibration is carried out. Experimental results show that the linearity is 0.9% and the sensitivity is 0.14mV/V in the measurement range from 0 to 0.5Nm with 0.3% resolution.
Design of the Angular Displacement Sensor Based on Magnetoresistive Technology
Authors: Lou Yun , Zhao Xiang Yang
Published: September 2013

The design of the angular displacement sensor based on magnetoresistive technology uses DSPIC30F3010 digital signal processor for computing. Having been amplified, magnetoresistive element output signal enters into the single-chip microprocessor A/D converter unit to operate together with the Hall components output signal operation processing, and ultimately generates the actual angular displacement values.
Study on Monitoring and Control System of Vehicle-Mounted Rig Based on CAN Bus
Authors: Fan Dong , Weng Yin Sheng , Tian Hong Liang
Published: September 2013

The monitoring and control system based on CAN bus was designed in order to implement the data reliable transmission between all nodes in the control system of the vehicle-mounted rig. Firstly, the hardware structure of the monitoring system was designed in the paper, and two CAN network was built, which one CAN network used CANopen protocol and the other used J1939 protocol and CAN2.0B protocol, that it saved the resource of hardware and software. Secondly, all CAN protocols , program flow chart and software with Labview were designed in detail. The application results of the actual engineering showed that it realized the function of data transmission with each console and real-time monitoring.
A New Redundant Device for Monitoring Mechanical Press Slider Second Fall
Authors: Pan Xiao Bin , Zhou Rong , Pan Yang , Li Guo Ping
Published: September 2013

this paper designs a redundant second fall detection device. On the basis of the traditional mechanical press slider second fall detection device, this new type device adds an MCU detection unit independent of traditional PLC system. Using the magnetic rotary encoder to replace traditional photoelectric encoder, realize non-contact measuring angle, which can reduce the probability of component failure. Compared with the traditional second fall detection device, this kind of redundant type second fall protection device can greatly increase the safety performance of the mechanical press.
Development and Application of Die Swell Data Gathering System Based on Multi-Function and all-Electric Rheometer
Authors: Li Xiang Gang , Liu Yue Jun , Zhao Fang , Huang Yu Gang , Chen Yi , Liu Wen Yong
Published: September 2013

A real-time die swell data gathering system was developed based on laser diameter gauge in order to measure the die swell of the viscoelastic materials. Software of the system is compiled by C language. Data gathering, date display, data saving and date analysis were realized. Experimental procedures were established, by which the die swell can be acquired. The laser gauge is put 5cm under the die of self-developed multi-function and all-electric rheometer (MAR) to measure the diameter of the extrudate. The rheological behaviors of the PP/PS blends are tested. The change laws of the melt die swell ratio in the condition of different frequency and amplitude were obtained. Compared with the steady-state extrusion, after introducing vibration force field, the melt die swell ratio decreases obviously. The die swell ratio of the blends decrease in fluctuation state with the increase of the frequency; while decreases gradually with the increase of the amplitude. In addition, with the die length-diameter ratio increases, die swell ratio of the blends decreases gradually.
Design and Implementation of Large Computer Room Environment Intelligent Monitoring System Based on Zigbee
Authors: Zhao Xing Chen , Li Jin Qiang , Liu Jian , Shi Quan , Sun Ling
Published: September 2013

For large network communication equipment are in need of real time computer maintenance and management, the traditional manual management can't meet this need, so this paper designs a set of real-time data acquisition, intelligent alarm and remote control, large computer room environment monitoring system based on Zigbee. The system is composed of terminal monitoring subsystem, control subsystem and management terminal. The terminal monitoring system consists of ZigBee node through the network, and its data acquisition include temperature, humidity and smoke environmental data; MSP430F1611 and Ethernet module monitoring subsystem are responsible for packet analysis, Ethernet connection, and Web intelligent remote switch control when monitoring data reaches a threshold. The system also can be used in street lamp remote intelligent control, intelligent irrigation control system of greenhouse vegetables and so on. Therefore, it has good application value.
Design on Monitoring System of Fire Disaster Based on Zigbee CC2530
Authors: Chang Bo , Zhang Xin Rong , Li Li Hong
Published: September 2013

Aiming at the practical problems existing in the fire disaster monitoring, such as harsh site conditions, the detection point difficult to change and expand, low automation level and the monitoring products having higher prices, etc., a fire disaster environment parameters intelligent monitoring system is designed based on the ZigBee CC2530 wireless communication chip. By deploying sensor network nodes in monitoring area, the monitoring information, that is, temperature, humidity, and smoke concentration of the fire site, is aggregated to the central monitoring system in order to achieve a unified data management and network routing monitoring functions. The central monitoring computer stores and displays the data sent by ZigBee network, thus the real-time monitoring of changes in environmental parameters of the fire site is achieved. The monitoring results have shown that this system is stable, high reliable in data transmission and easy to use, and can be used in environmental monitoring occasions inconvenient of direct attachment.
Sensing Characteristics of Sampled Fiber Bragg Grating about Temperature and Strain
Authors: Zhu Dan Dan , Wang Yi Ping , Liu Wei , Meng Dan Rui , Hu Xiu Zhen , Song Jian
Published: September 2013

Sampled fiber grating is a novel fiber Bragg grating. Because of it is flexible, passive, low insertion loss and small polarization dependent. It causes great interest and enthusiasm of the people in many areas. Ambient temperature and strain can both affect sampled grating reflection spectrum. On the base of analysis of sampled grating temperature and strain sensing model ,we can use computer to simulate the sampled grating temperature and strain sensing experiments to get Sampled grating temperature sensing data and strain sensing data. By analyzing the factors of temperature and strain which affect the spectral characteristics of the sampled grating, and using regression analysis methods to respectively get the 4 parameters A, B, C, D of sensing properties, so we can simultaneously measure the changes of temperature and strain through single sampled grating.
Development of Timing Component for Angular Distortion Measurement System
Authors: Zhang Ming Hui , Zhang Yao Yu
Published: September 2013

A timing component is developed in order to achieve the synchronization between measuring system and external devices. The function of timing system, as well as the data switching driver based on twin port RAM and interrupt response driver developed by using DDK (Driver Development Kit), are introduced in this paper. The timing component has been used to ensure the synchronization between measurement system and vessel devices, and successfully applied in angular distortion measurement systems.
Design and Manufacture of a Planetary Gearbox Rig
Authors: Bligh A.O. , Ahmed Noor A. , Zheng Y.Y.
Published: September 2013

Planetary gearboxes are required in many applications but have a high failure rate especially in wind turbines where rapid growth in turbine size is placing larger demands on the gearboxes. Current condition monitoring techniques are less effective at detecting faults in planetary gearboxes due to the complexity of the internal rotating components. A small scale planetary gearbox was, therefore, needed for testing on a gearbox test rig to develop a more effective method of condition monitoring. The detailed computer design and manufacture of the planetary gearbox for this purpose is detailed in this paper.
Thermal Characteristics of High-Power LED Packages with Dissipation Film
Authors: Hsu Cheng Yi , Lin Yu Li
Published: September 2013

A simple, fast, and reliable characterization method for measuring junction temperature (Tj) on high power GaN-based light emitting diodes (LED) was presented in this study. Thermal characteristics of high power Light-emitting-diode have been analyzed by using a three-dimensional thermal conduction model. Maximum operation temperature has also been calculated. The induced thermal behaviors of the best package processes for LED device with diamond film were investigated by finite element analysis (FEA) and by experimental measurement. The large change of forward operation voltage with temperature in light emitting diodes is advantageously used to measure junction temperature. Using this method, junction temperature (Tj) of LED under various structures and chip mounting methods was measured. It was found that the junction temperature can be reduced considerably by using diamond film substrates to replace sapphire substrate. In this study, the junction temperature can be decreased by about 14.3% under 1.5W power and decreased by about 15.9% under 1W power for 1mm square die. The thermal resistance (RT) can be measured to be 14.8°C/W under 1.5W power and 16.6°C/W under 1.W power.
New Bank Electronic Combination Lock System
Authors: Chang Feng Jun , Wang Chen
Published: September 2013

This paper based on ARMV7 architecture of Fujitsu's architecture M3 series MB9BF506R 32-bit processors as a combination lock master control chip, a reasonable analysis of the new architecture based on the practical method to realize electronic combination lock, this paper proposes a new design concept - based on multiple jurisdictions real-time monitoring system of security, added with special customized mobile phone validation in the form of fingerprint access and data transmission function, effectively strengthen the safety and reliability of electronic password system, on the current electronic combination lock industry progress of developmental significance.
Characteristics Analysis and Simulation Testing on Modular Multilevel Converter VSC-HVDC Based on RTDS
Authors: Chen Jian Guo , Yu Cang Bi , Sun Ting Ting , Ou Kai Jian
Published: September 2013

Real-time simulation on the Modular Multilevel Converter (MMC) VSC-HVDC is one of the most important and difficult technologies in the area of power electronics research. After introduction and analysis on the RTDS simulation technologies for MMC VSC-HVDC study, this paper sets up the simulation model for MMC VSC-HVDC with inter control and researches on its operation and fault characteristics. Moreover, the simulation and testing system for MMC VSC-HVDC with physical control is also set up. The testing result should that, the voltage balancing method and phase disposition (PD) control strategy of the physical MMC control system perform well duing the test.
Three Carrier PWM Control of Improved Z-Source Inverter
Authors: Zhang Hai Gang , An Wei Wei , Li Xiao Bin , Li Jun Jun
Published: September 2013

A kind of three carrier PWM control method is put forward for improved Z-source inverter. The switches are controlled by comparing three carrier and three reference waves. The shoot-through zero state are injected in the time when traditional zero vector worked. The voltage gain is determined by the dc offset voltage of carrier wave when the modulation index is constant. Boost factor is made independent of the modulation index. And the switching loss is reduced. The voltage stress on the capacitances and switches are analyzed in detail. Simulation results show that this method possesses better control performance.
A Review of Applying Customer Power Technology to Improve Transient Power Quality
Authors: Shi Huang Xia , He Ying , Zhao Li
Published: September 2013

Modern high and new technology and informatization have made increasingly high demand on transient power quality. The article first outlined the classification of transient power quality problems, introduced the concept of customer power technology, and pinpointed that this technology serves an effective means to solve transient power quality problems. This paper also discussed in a comprehensive way a number of customer power technologies capable of improving transient power quality which have seen the widest application in researches and practices, and analyzed its working principle, researching status as well as key technologies. The paper ended with a brief summarization of the latest research developments in this field.
Random Yield Model in Integrated Circuit Design
Authors: Chen Xiao Ming , Wu Wen Qi , Li Song Song
Published: September 2013

As feature dimension of integrated circuits (IC) come into nanometer nodes, yield problems caused by random defects get worse. Even with advanced process techniques, the yield could not achieve 100%. Accurate prediction of yield can point out the direction of process optimization, shorten the production cycle, reduce the production cost, and then increase profits. In this paper, some kinds of random defects which can influence random yield are summarized. Then some widely used yield models are outlined and the drawbacks of these models are analyzed. At last, an improved yield model is proposed with the combination of Poisson model and negative binominal model. This model which takes distributions of random defects into consideration is more flexible and accurate. It can be seen from the simulation results that comparing to those existing models, the improved model indeed has higher fidelity and more flexibility.
Modeling and Simulation of the Auxiliary Power System in Extended Range Electric Vehicle
Authors: Chen Ling Shan , Wang Xiao Le , Huang Xiang Er , Gan Pin , Cheng Wei
Published: September 2013

To study the performance of auxiliary power unit in extended range electric vehicle, simulation model of auxiliary power unit and its control system are established with MATLAB/Simulink. The method of decoupling control achieved engine speed control and generator torque control. Finally actual power responds change of required power quickly.
Study of a Multi Objective Reactive Power Compensation Device Considering Fault Current Limiting
Authors: Wu Hong Mei , Hui Wen Ting
Published: September 2013

With the increasing demands of power quality, high-quality power supply has become a necessary condition of modern social life. Power quality problems include voltage sag/swell, voltage unbalance and harmonics. To solve the above problem, a multi objective reactive power compensation device considering fault current limiting is designed, which can provide a certain degree of reactive power compensation to solve multi-objective system powered composite power quality problems during the normal working of the power system, and be able to quickly to limit the short-circuit current mode switching when power system under fault conditions. Finally, on the basis of theoretical analysis, experiments and simulations confirmed the correctness and effectiveness of the control strategy.
Evaluation of Silicon Nitride MIM Capacitors for MMIC Applications
Authors: Feng Wu Shiung , Chen Yi Jung
Published: September 2013

With the rapid development and huge requirements of wireless communication systems, microwave-monolithic Integrated circuits (MMIC) with high performance and reliability have become very popular and been developed rapidly. The nitride quality and the reliability of the metal-insulator-metal (MIM) capacitor can be also researched based on time-dependent dielectric breakdown (TDDB) theory. In this paper, the various Si3N4 capacitors having different area sizes, aspect ratios and corners were designed with respect to nitride quality and lifetime evaluation. All of MIM capacitors used in this study are manufactured using a special reliability mask, and the test structures include various sizes of capacitors ranging from 10Kμm2 to 250Kμm2 as well as capacitor corner check. The ramp voltage and the constant voltage tests are destructive oftentimes to identify the cause of dielectric failure. Combining these breakdown marks with an optical microscope inspection and cross section check of the 10Kμm2 capacitors as well as corner-structure check are reported in this paper. That can make the identification and classification of dielectric breakdown mechanisms. When the capacitor size is larger than that of 65K-um2, the factor of failure acceleration raises significantly.
Research on Smart Meter BOA and System Design
Authors: Zhao Jian Yang , Cheng Jing Mei , Ding Wei Hong
Published: September 2013

As an important part of the smart grid, smart meters and advanced metering infrastructures are given the newly missions connected network. Along with Ethernet development smart meters with measurements and networks, meter with BOA can become reality. In this paper a system of smart meter BOA and its smart meter networking has developed. It has real time displays and storage of smart meter data. The system uses a ARM9 (S3C2440) chip with a Linux operation system. Gathering from breaker via RS232, Data are sent to BOA server through named pipes to be displayed on web. At the same time, these data are stored in embed data base SQLite, for feature managements.
The Simulation of APF Based on Three-Phase VSI
Authors: Wang Yu Feng , Liu Guang Ye , Lv Xiao Guo , Wang Zhong Chu
Published: September 2013

In order to restrain harmonic pollution of power grid, the structure and control strategy of APF was researched. The structural parameters and method of direct current control of the most widely used APF with three-phase VSI was discussed. Decoupling control of active and reactive current on the dq plane was realized by dq transforming. Harmonic of load current was detected by Ip-Iq algorithm based on the instantaneous reactive power theory. Double closed-loop control was applied and PWM drive signals of IGBT were got through comparison of triangle wave and modulation wave. The simulation results demonstrate that the kind of control method make APF good dynamic response and static compensation.
Ultralow-Repetition-Rate High-Energy Square Wave Pulse Amplification System for the Brillouin Optical Fiber Sensing System
Authors: Tian Hang , Yin Cheng Qun , Lv An Qiang , Li Yong Qian
Published: September 2013

This paper is aimed at designing a special pulse power amplification system for an ultrahigh-speed pulser that is used in Brillouin optical fiber sensing system. This amplification system consists of three parts, that is, signal receiving part, power amplifying part and 180 degree phase shifting part. Considering the fact that signals produced by the pulser are 1.2V differential PCML square wave signals and have ultrafast rising and falling transition time, high speed op-amps were adopted to receive signals and isolate pulser and amplifier. Since square wave signals have ultralow duty ratio, the power amplifier was designed with only one transistor working in switch-mode. As the effective frequency component of the pulse is up to 1500MHz, this design made use of a high speed high voltage operational amplifier to shift phase for signals. The eventually result indicates that, this amplification system can amplify square wave signals whose pulse width ranges from 2ns to 5ns, and voltage amplitude 1V of square wave signals with maximum duty ratio 5:105and minimum duty ratio 1:106up to 8V.
The Influence of Exciting Inrush Current of Transformer Differential Protection
Authors: Wang Yan Hong
Published: September 2013

The differential protection for transformer is main protection , the unbalance current is the main factor affecting the behavior of the protection. The unbalance current caused many reasons, generally can be divided into steady state and transient state, the transient unbalance current is mainly under the circumstance of exciting inrush current, Containing a lot of harmonic component and harmonic component, based on this the paper studied the harmonic component in the application of power transformer differential protection, and through the simulation analysis.
GSEP: an E-Mail Protocol Based on Generalized Signcryption
Authors: Si Ya Li
Published: September 2013

The security in e-mail protocol has received significant research attention. In this paper, an e-mail protocol, GSEP, using improved generalized signcryption scheme is proposed. GSEP can send private e-mail, public e-mail safely, and using key trace to solve the problem of key escrowing, using identity authentication to solve the problem of junk e-mail. The proposed protocol not only improves the information processing capability of e-mail system for its multi-function, but also guarantees the security of transmitting information.
Enhanced Power Allocation and Relay Selection Scheme in Two-Way Relaying Cognitive Radio Networks
Authors: Chen Dong , Li Xiang , Su Li Ping , Liang Jin
Published: September 2013

This paper addresses the enhanced power allocation (PA) and relay selection scheme (RS) in two-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays. In order to reduce the computational complexity for practical scenario, we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput. Simulation results show that the proposed BnB-based PA and RS scheme can achieve better tradeoff of system throughput and complexity.
A New Measurement Method of Conducted EMI on the Power-Line Communications Channel
Authors: Fu Wei Long , Guan Ya Lin , Lu Yang
Published: September 2013

Various kinds of household appliances have been widely deployed in the low-voltage grid. They inject conducted noise into the power line system, which may cause a detrimental effect on the Power-line Communications (PLC) channel. This paper examines a new measurement method of conducted Electromagnetic Interference (EMI) on the PLC channel. The proposed method is to facilitate the noise characteristic research, which overcomes the potential difficulties when the measurement is performed according to CISPR 16-2-1. In particular, taking the hairdryer as an example, the conducted noises when the motor is deemed as the noise source are measured by employing the presented method. Moreover, this paper also analyzes the conducted noise of the hairdryer both in the time domain and in the frequency domain, and interprets the noise generating mechanisms with the working principle of the motor in detail. The central issue in all these studies is to research the conducted electromagnetic noise characteristics on the PLC channel.
All-Optical Wavelength Conversion Based on XPM in HNLF
Authors: Wang Li Li , Qiu Xiang Yan , Ma Qiu Ming
Published: September 2013

All-optical wavelength conversion using cross-phase modulation (XPM) in a HNLF is demonstrated in this paper. The broadened spectrum caused by XPM which is induced by the input Gaussian pulses is given. The output BER of wavelength conversion is investigated.
A Secret Sharing Algorithm Based on Regenerating Codes
Authors: Zhang Shu Zhen , Song Hai Long
Published: September 2013

As a kind of special MDS erasure coding, regenerating codes are firstly used to solve the fault-tolerant problem in distributed storage systems. This paper constructs a new kind of secret sharing algorithm based on regenerating codes. The main process is that the original secret data is firstly stripped and coded with MDS erasure coding algorithm, then the vector components are periodically distributed to secret sharers in a certain order. The secret data can be rebuilt by decoding algorithm of regenerating codes if there are enough shares of the secret. Theoretical analysis shows that the algorithm is a safe threshold scheme. Because the operations are mainly linear on small finite field and its computation cost is low, so it is easy to realize.
A Mental Clustering Algorithm Based on the Embedded Agent in Wireless Sensor Network
Authors: Jian Yu Mei , Chen Ming , Feng Guo Fu
Published: September 2013

In this paper, a clustering protocol for Embedded Agent sensor network is proposed.In LEACH protocol, the selection probability P of candidate cluster head is constant without thinking about residual energy, which caused the lower residual energy easy to be the candidate cluster head.Compared with traditional structure of wireless sensor network, parameter was optimized. The confidence of the node, select probability and residual energy are the parameter of candidate cluster head, communication cost as the parameter of final cluster node. Compared with LEACH and ASCH, EACA take more parameters than LEACH. Results show that EACA can balance the energy load in the network, and effectively reduce more energy consumption.
Design and Actualization of Intrinsically Safe Voice Warning System for Mine
Authors: Gao Li Li , Luan Zhao Xue , Liu Yan Fang
Published: September 2013

According to the actual situation of coal mine,a voice alarming system which can meet with remote communication is designed. The system bases on CANopen protocol and can remotely transfer voice data through CAN bus.Furthermore it is of MP3 play function.Testing results shows that the voice alarming system can transfer voice data at a very low rate of 2.4kbit/s with distortion of voice signal being less than 15% and sound intensity being more than 90 db.The system is suitable for application in the underground due to its high reliability and low energy consumption.
Investigation of the Impact of BIM&IPD on Change Orders Using Bayesian Network Method
Authors: Liu Mei
Published: September 2013

Change orders present one of the largest sources of cost growth on building construction projects and have negative impact on productivity, labor efficiency and building environment. Building Information Modeling (BIM) is proved a high technology that greatly benefits both design and construction, greatly promoting the design visualization and construction 4-D modeling. Driven by BIM, Integrated Project Delivery (IPD) emphasizes communication in the collaborative process by avoiding adversarial or counter-productive professional relationships to reduce waste and rework. If BIM&IPD can be properly applied in project, quite a lot change orders can be avoided and then project cost will be reduced. This paper investigates the impact of BIM&IPD on construction change orders using Bayesian Network method. Bayesian Network is a graphic model representing cause and effect relationship between change orders and BIM&IPD. In this paper, evidence reasoning and probabilistic inference analyses are conducted to indicate the causes in light of the results and forecast the results according to causes. From the analysis, Bayesian Network is proved a good tool for construction managers to make decisions.
Active Queue Management Based on State Variable Feedback Control
Authors: Jing Qi , Gu Ming Ming
Published: September 2013

A new AQM algorithm based on state variable feedback control (SPC) is proposed. The future dynamic queue length in data buffer predicted by state space model is successfully introduced into feedback data's advanced prediction to compensate feedback delay. Finally, the control requirement of congestion is converted to optimal control objective function, and drop probability is obtained by solving the optimal problem. The simulation results show that the queue length with SPAQM algorithm reaches the desired value with minimal tracking error and lower drop probability. SPAQM algorithm has better performance than PID algorithms and RED algorithms in terms of disturbance rejection, stability, and robustness.
Parameter Computation of Equivalent Mechanical Models of Liquid Sloshing in Spacecraft Container
Authors: Zhang Li Xin , Bai Zheng Feng , Zhao Yang , Cao Xi Bin
Published: September 2013

Liquid sloshing is the source of disturbance. General the equivalent mechanical models are used to simulate the liquid sloshing in container. In this paper, the equivalent pendulum model for liquid sloshing is established. Further, the parameter relationship between the equivalent spring-mass model and equivalent pendulum model is presented. Then, parameter determination process of the equivalent mechanical model is proposed. Finally, a numerical example is implemented to calculate the parameters of equivalent model for liquid sloshing in a container.
Study of Selective Video Encryption for the H.264 Standard
Authors: Wang Qiu Hua , Wang Xing Jun
Published: September 2013

Video encryption has been widely researched in digital right management in recent years, especially selective video encryption. Selective video encryption has been the main trend with the development of compression coding methods, which selects an important subset of the comparative large compressed video data to encrypt in order to satisfy the real-time features and ensure the security of the video at the same time. In this paper, according to a particular evaluation criterion we proposed, we mainly analyze several selective video encryption algorithms based on the H.264 standard. Through the analysis we find out how to select the different vital data sets of the video to encrypt according to various security levels and applications.
Partial Discharge Identification Using Multiple Features Fusion Based on Evidence Theory and Support Vector Machine
Authors: Xu Yuan
Published: September 2013

The time resolved partial discharge (TRPD) signals collected by Ultra High Frequency (UHF) sensors of transformer contain important informations of the properties of faults. Wealth of information can be utilized for fault identification by different signal analyzing techniques, such as time domain analysis, frequency domain analysis and the wavelet analysis. An integrated characteristic information fusion system based on the Platt posterior probability model and support vector machine (SVM) one-against-one method is proposed. From the recognition result of the four typical insulation defects, the recognition system shows strong advantages in accuracy and reliability.
Random Phase Weak Sine Signal Detection Based on Autocorrelation and Chaos Theory
Authors: Cheng Feng Qin , Shi Yao Wu
Published: September 2013

The paper expounds the basic principle of the weak signal detection on chaotic system at first , according to the actual situation that the signal phase is unknown Received in the communication and radar systems, a new chaos detection model is presented based on traditional chaos system, combined with autocorrelation detection technology , completed the random phase weak sinusoidal signal detection. The simulation analysis indicates that the proposed method succeeds in detecting Random Phase weak sinusoidal signal, and furthermore the signal-to-noise threshold is lower than either autocorrelation or chaotic oscillator.
P300 Oddball Task and Classification Based on Support Vector Machine for BCI System
Authors: Cui Gao Chao , Cao Jian Ting
Published: September 2013

The P300 oddball task is the most popular paradigm in the existing BCI systems. Recently using auditory stimuli in P300 oddball task arises since it gives much freedom to the BCI user. In this paper, we present a novel BCI paradigm using P300 and P100 responses. Since P300 and P100 responses occur in the frontal lobe and the temporal lobe respectively, so that we can use these responses stimulated by an audio in a single task. The main advantage of our designed paradigm is that we can obtain two different kinds of responses in a single trial EEG task. In the EEG data analysis, we first employ the multivariate empirical mode decomposition (MEMD) algorithm to extract P300 and P100 components. And then, we employ a support vector machine (SVM) technique for the feature classification.
The Methodology Analysis of Traffic Volume Data Processing of Regional Road Network Based on Bi-Level Programming Models
Authors: Meng Xiao Li , Chen Da Wei
Published: September 2013

The data processing of traffic volume is a key issue in the traffic planning. In order to solve the problem of data processing on traffic volume, the bi-level programming model built is employed to work out production-attraction value of each district and O-D distribution matrix. In this model, upper part is to calculate the minimized variance between investigated value and calculated value. While the lower part of this model aims at the fact that travelers turn to the shortest path. The upper model is solved by genetic algorithm. And the result from an example application reveals that we can obtain reasonable production-attraction value and O-D distribution matrix by this method.
Design and Implementation of a New Type of Underwater Acoustic Target Simulator
Authors: Li Tong Xu , Zhang Xiao Min , Chen Yu
Published: September 2013

According to the actual needs of underwater acoustic homing system in system debugging and experiment parameters setting, a new design of real-time water target simulator is introduced. This system simulates the acoustic reflection characteristics of targets, receives active detection signal and emits signals of reflection echo characteristics. The target simulator can response up to two active detection signals in the condition of interference. This system is complete, accurate and can be extended. Users can monitor the working state of simulator and change the parameters of simulator. As a result of an echoic tank experiment and lake experiment, the system has been successfully applied to the underwater homing system.
Research on Sound Source Localization System Based on Time Delay Estimation
Authors: Zhang Chuan Yi , Mi Chang Wei , Yao Pei Yang
Published: September 2013

In the estimation of time delay, there always would not appear obvious peak with the basic cross-correlation (CC). In order to solve the problem of the basic cross-correlation method, this essay represents an improved time delay estimation method based on the generalized cross-correlation (GCC) and combines with the microphone array structure to achieve sound source localization. Finally, the simulation results show that this method could measure the sound source’s location accurately with noise and reverberation, and the distance positioning error is less than 10cm, the direction angle error is below 3°.
Freeway Traffic Congestion Identification Based on Fuzzy Logic Inference
Authors: Peng Ming Long , Liang Xin Rong , Dong Chao Jun , Liu Yan Yan
Published: September 2013

Traffic congestion detection is the basis of dynamic traffic control and real time guidance. This study proposes a fuzzy logic based traffic congestion identification method. The components of a fuzzy logic inference are firstly formulated. According to such information as the speed and occupancy of freeway traffic flow, and the weather conditions on the freeway, a congestion identification method based on fuzzy logic inference is then designed. Gauss curves are assumed for the membership functions of the input and output variables, and 45 fuzzy rules are also established. Finally, the congestion identification method is simulated. Simulation results verify the effectiveness of the above method. Fuzzy logic inference is suitable for estimating the traffic congestion index.
Real-Time Boundary Detection of Fast Moving Object in Dark Surrounds
Authors: Miao Peng , Feng Shi Han , Zhang Qi , Ji Yuan Yuan
Published: September 2013

Dark surrounds make detection of moving target more difficult based on traditional methods. A real time identification of fast moving object under weak illumination is critical for some special applications. Traditional blob, contour and kernel-based tracking methods either need high computational loads or require normal illumination which limit their application. In this paper, we propose a new method trying to settle such difficulty based on temporal standard deviation. The performance of new method was evaluated with simulation data and real video data recorded by a simple imaging system. Combining hardware acceleration, a real time detection and visualization of fast moving boundary in dark environment can be achieved.
Research of the Disguise Identity Based on EEG
Authors: Zhang Xue Min , Xiong Zeng Gang , Mu Zhen Dong
Published: September 2013

The research as identity recognition using photographs evoked EEG signal, results show that it is easy to identify subjects, but it is in the subjects with the experimental condition, when the subjects don't fit or deliberately wrong, generate camouflage signal, what impact will the identification, existing research rarely the subjects involved, camouflage case EEG and under the condition of normal EEG signal difference, carries on the analysis from the brainwave components, in order to find the similarities and differences between them, to provide the reference for the identification .
The MATLAB Realization of Toning up Digital Image Based on Wavelet Transform
Authors: Cao Xu , Zhang Hua Xun , Xie Yan Nan
Published: September 2013

This paper mainly description image enhance based on wavelet transform. The author gave the theory of wavelet analysis, the application of wavelet transform in image enhancement. The impression drawing is given by means of MATLAB simulation. Through tone up to disperse wavelet transform, rebuild coefficient, the siginal of image is more boost up in low contrast section than high contrast section, the margin is distinct.
The Research on Data Acquisition Subsystem for Aluminum Reduction Cells under Reconstruction
Authors: Liu Mei , Li Qin Wei
Published: September 2013

In this paper, a data acquisition subsystem for aluminum reduction cells under reconstruction is designed on memory mapped file and MODBUS, has realized the sampling procedure and the main control program of real-time data transmission through the memory mapped file, has realized the MODBUS communication between the sampling procedure and the prestage using MSComm control, the system can work stably at present.
The Numerical Simulation Research on Heat Transfer Enhancement of the Interpolation-Tubular Air Pre-Heater with Semi-Elliptic Cylinder Shell Vortex Generator
Authors: Qing De Fan , Ai Qing Feng
Published: September 2013

The semi-elliptic cylinder shell vortex generator set in the interpolation-tubular air pre-heater was studied. And by changing the high-width Ratiov, dip angleα, attack angleβ, spacingsof vortex generator to research the heat transfer and resistance properties under different working conditions, and the optimization structure of vortex generator was determined. The heating medium of the air pre-heater is the flue gas that passes across tube outside, and the cooling air as the cooling medium in the tube longitudinal scoured. The Reynolds number range is 25000 ~ 40000. The research shows that: semi-elliptic cylinder vortex generator can obviously improve the heat transfer performance, the optimization structure of the semi-elliptic cylinder vortex generator: high-width ratiov= 0.45, attack angleβ= 65 °, dip angleα= 15 °, spans= 90 mm, the heat transfer enhancement comprehensive effect raised about 43.2%~72.6%.
Extraction Research about Parallelization of Named Entity Based on Hadoop Platform
Authors: Shi Quan , Yang Zhen Dong , Xu Lu
Published: September 2013

With the era of big data approaching, data becomes more and more important. Faced with such massive amounts of data space, how to quickly identify the contents of a field that the users are interest in and extract them out, is an urgent problem to be solved. To identify the content that users are interested in, we can use NLPIR Chinese word segmentation framework for speech segmentation, and identify named entity according to part of speech tagging. For extraction, using Hadoop, parallel cluster platform based on a big data MapReduce framework, using the Hadoop Distributed File System (HDFS) for efficient data access and starting Map and Reduce tasks to extract the information of named entity. This task extracts the required information from the interactive encyclopedia and then stores them in the knowledge base. It implements the task of extracting the information data of parallelization of named entity based on Hadoop platform.
Cyclic Relation Method for DOA and Polarization Parameters Estimation of Arbitrary Polarized Array
Authors: Shi Yi Ran , Tian Yan Tao , Zhu Lan Xiang , Deng Li Fei
Published: September 2013

Focus on the estimation for DOA and polarization parameters of electromagnetic sensor array, this paper proposes the method that uses cyclic relation function to substitute for covariance matrix. Because cyclic statistic is less sensitive to stable noise and any cyclic stable noise with different cyclic frequency, the method proposed is immune to any stable color noise. This method use minimum norm method to solve the spectrum function. So this method can restrict the effect of the cyclic relation matrix estimating error. Computer simulation experiments prove the performance of this method.
The Data Manipulation Platform of Well-Logging Information Based on Agent
Authors: Yang Li Ping , Wang Wei
Published: September 2013

According to the distribution and diversity of logging information, well-logging information data manipulation platform is established by Agent software technology, in a highly flexible, robust and unified information management environment, provide support for comprehensive well-logging information distributed storage and reuse. Examples of well-logging information reuse, verified the feasibility of application mode.
An Access Control Model for XML Repositories
Authors: Zhong Hao
Published: September 2013

The XML documents are nested and semi-structured, but the traditional access control mechanism is coarse-grained and not applicable. We proposed an XML access control model (XACM) for XML repository. The XACM provides a fine granular definition for XML authorizations, which is based on the self-description characteristic of XML. We also discuss how to use the XACM to automatically preserve the access control policy, when relational databases are published as XML documents. Finally, we present the implementation of the XACM in an actual XML publisher system. Comparing with existing related works, the XACM is more flexible, efficient and less overheads.