bluuebunny/crossref_metadata_2025 huggingface dataset:
Power Spectra Density Replication Control Strategy for 2-Axis Hydraulic Shaker Based on HV Estimator
Authors: Chen Yu , Luan Qiang Li , Chen Zhang Wei , He Hui Nong
Published: July 2014

Hydraulic shaker, equipment of simulating laboratory vibration environment, can accurately replicate the given power spectral density (PSD) and time history with an appropriate control algorithm. By studying method Hv estimator of frequency response function (FRF) estimation, a FRF identification strategy based on the Hv estimator is designed to increase the convergence rapidity and improve the system response function specialty. The system amplitude-frequency characteristics in some frequency points or frequency bands have large fluctuation. To solve this issue, a step-varying and frequency-sectioning iterative correction control algorithm is proposed for the control of 2-axial exciter PSD replication tests and the results show that the algorithm has a good effect on the control of hydraulic shaker, and can achieve reliable and high-precision PSD replication.
Numerical Simulation of Seismic Wave Propagation in Different Media
Authors: Feng Zhi Ren
Published: July 2014

Theory of elastic waves layered homogeneous medium or even medium for the study can not meet the actual demand for seismic exploration, especially for fine rock to construct reservoirs for the study, had to consider small-scale heterogeneity of seismic wave propagation effects. In this thesis, multi-scale model of a complex medium, in ensuring the premise to further improve simulation accuracy simulation efficiency issue, the introduction of a variable grid numerical simulation techniques, and were analyzed for different types of grid difference, establish a different media model simulation results verify the validity of simulation and analyzes its efficiency and accuracy problems.
New Control Topology for Railway Static Power Conditioner
Authors: Pan Ying , Bao Juan
Published: July 2014

The traction power supply system of electric railway has the disadvantages of heavy unbalanced three phase, large harmonics and reactive power. Based on back-to-back converter, railway static power conditioner (RPC) can effectively balance the load between two arms, compensate the harmonic current and reactive power. As the conventional PI control is difficult to trace the waveform, a dual-loop control scheme was applied. The control scheme reduces the influences of the factors, such as sampling and calculation delay, dead-zone, parameters’ shift, on the system stability and enhances the robustness of the whole system. It can also eliminate the negative sequence current and three-phase voltage fluctuations of the primary side, improve the power factor and harmonic filter, so that electrified railway power quality problems can be resolved perfectly. The whole design was provided. Analysis and simulation results testify the effectiveness of the proposed control scheme.
Dynamic Economic Dispatch Based on Improved Particle Swarm Optimization
Authors: Li Yong Gang , Han Liang
Published: July 2014

Because wind power can reduce the total generation costs under certain conditions, in order to minimize the system production cost, optimize the power output of thermal unit, a dynamic economic dispatching (DED) model containing wind power based on energy-saving and emission reduction benefits is proposed. Such DED model has a nonlinear objective function and the characteristic of high dimension, and is restricted by many constraints. An improved particle swarm optimization (IPSO) is proposed for solving the problem. Feasible regulation scheme is adopted in equality constrains. On the premise that the speed of iterative convergence is assured, the diversity and the excellence of solution are improved by introducing the differential mutation, which enhances the algorithm in breaking away from the local optimum and speeds up the iterative convergence of the algorithm.
Electric Power Communication Network Optimization Algorithm Based on the Equivalent Network
Authors: Xing Ning Zhe , Guo Jia Qi , Yu Ran
Published: July 2014

Reliable power network can provide reliable operation of electric power for dispatching communication security, due to many key network nodes external connectivity in the electric power communication network has only one path, so once the link damage because of emergencies, these networks because of the failure of nodes (or communication link) and power operation scheduling of exception can occur easily, thus to cause great damage to the safe operation of the whole power network. In order to improve the robustness of system in this case, this paper designed a new optimization algorithm based on the equivalent network to simplify the real network and the network analysis.
Research on Modeling and Characteristics of Two-Stage Pressure Hydro-Pneumatic Spring
Authors: Li Zhong Xing , Ma Zi Li , Jiang Hong , Xu Xing
Published: July 2014

The structure and principle of the two-stage pressure hydro-pneumatic spring were introduced. the physical and dynamic vehicle models with it were established under AMESim environment. Static characteristic curves of the two-stage pressure hydro-pneumatic spring were drawn. A single chamber hydro-pneumatic spring was used to compare the suspension dynamic travel and body vertical acceleration of the vehicles equipped with two-stage pressure hydro-pneumatic spring. The results show that two-stage pressure hydro-pneumatic spring can effectively enhance the vehicle riding comfort by decreasing body vibration.
Coordinated Charging of EVs Based on Demand-Side Management
Authors: Li Yu Kai , Ouyang Hong , Zhao Jia Kui , Rong Xiu Kai , Dong Yi
Published: July 2014

Electric vehicles (EVs) are adopted as an effective way to reduce the pollution of atmosphere. However, if EVs are implemented in a large scale without control, peak load would increase significantly and the grid may be overloaded. Based on Demand-Side Management (DSM), an coordinated charging method for EVs to address the problem of that is proposed. Considering load fluctuation of power grid as well as time-of-use (TOU) power price, a multi-objective optimization model is formulated to minimize the charging cost and restrain the load fluctuation. Overall power load is composed of original daily load and EV charging load, which is obtained through Monte Carlo simulations. On the basis of this, the optimal number of charging EVs in each period is worked out with NSGA-II algorithm. At last, the case study carried out shows the reasonability of this method.
A New State Machine Optimization Method in the Protocol Conversion System
Authors: Li Qi
Published: July 2014

In the large-capacity, high-speed and real-time data acquisition and transmission, PXI bus have a widely application in the field of data acquisition and transmission. This paper introduces the design and implement of simplified state machine in the measurement and control system based on PXI bus. The results of test indicate that the technology is practical and valuable.
Mode Conversion Models Based on Spatial Spectral Matching for Mode Division Multiplexing in Optical Fibers
Authors: Lan Ming Ying , Nie Song , Gao Li , Cai Shan Yong , Ma Chen Xing , Qi Xiao Li , Du Zhi Chao
Published: July 2014

In this paper, a mode conversion model is proposed to increase the capacity of optical fiber communication systems. In this model, a spatial spectral matching method is used to convert the original mode to the desired mode for mode division multiplexing in optical fibers. A binary phase spatial light modulator is employed on the Fourier plane as a spatial filter. Numerical results show that the original modes can be converted to the desired modes.
Research on Coupler of Single Mode Fiber with Photonic Crystal Fiber
Authors: Wei Qing Song , Chen Zhe , Luo Yun Han , Ma Yue , He Xiao Li , Che Zhen
Published: July 2014

A coupler of single mode fiber with photonic crystal fiber with a coupling ratio of 0 to 90% was fabricated with a new method called Auto-deposition Fused Side-adhere. A model for coupler of side-polished single mode fiber with side-polished photonic crystal fiber was established which proves it feasible to make such a coupler practically. In the range of 1520~1620nm, the Wavelength Dependent Loss (WDL) of the through port was 0.3dB and of the coupled port was 5dB. The Polarization Dependent Loss of through port was 0.25dB and 0.31dB at 1310nm and 1550nm, and the WDL of coupled port was 1.46dB and 1.75dB. When temperature changed from 10°C to 80°C and humidity changed from 10% to 70%, coupling ratio changed about 7% to 16%. It can be concluded that a steady coupler of single mode fiber with photonic crystal fiber can be made with the Auto-deposition Fused Side-adhere Coupling method, which can give a reference method and lay an experimental foundation for the fabrication of photonic crystal fiber coupler.
CNC Network of Research and Development
Authors: Zhang Bai Jun
Published: July 2014

Network of NC technology is the realization of manufacturing automation, intelligence, integration and globalization of technology-based. This paper analyzes the development of the network system of the basic requirements of the proposed network of digital systems architecture, with emphasis on the numerical control system network hardware platforms and software platform of Design and Implementation of the analysis described, and pointed out that the Internet-based network NC CNC is a system of research and development trends, there is a strong sense of practical application.
Fundamental Considerations on New Technology Evolution in Latest Network Development
Authors: Luo Yuan Jun
Published: July 2014

Under the background of that NGN is coming into practice,the article uphold the scientific recognition spirit and external developing attitude to describe the distinct viewpoint about latest network development in two sides on different technology level. First,Based on the analysis of the key technical issue of the NGN,discover the essential substance of integration of the unified network,and point out the truth that the independent media-stream network ,not the integration network,to be the future one that lead the video service to the user in coming future. Following,starting from more fundamental position,the article state that the current technology architecture , which based on the point-to-point linear thoughts, has leads the network into a unbroken bottleneck. We must take a new and more society-suitable way,the face-to-face transfer architecture to fulfill revolution of the network communication technology.
Intrusion Detection Systems
Authors: Liu Gui Guo
Published: July 2014

In the ear of information society, network security have become a very important issues. Intrusion is a behavior that tries to destroy confidentiality, data integrality, and data availability of network information. Intrusion detection systems are constructed as a software that automates the automatically detects possible intrusions. In this paper, we present the existing intrusion detection techniques in details including intrusion detection types, firewalls, etc.
Research on Composite Web Services Selection Based on Dijkstra Algorithm
Authors: Li Yu Qiang , Li Yu Wen , Che Lei
Published: July 2014

Services composing have played an important role in the industry and academia in recent years. Based on the relevant theory and experience of the shortest path problem in a DAG, we propose the method of dijkstra algorithm implementing services composing way selection. Then we provide the pseudo code description of the algorithm implementing the optimal path selecting process and test the correctness of algorithm through the contrast experiment to offer a feasible solution for services composing way selection.
The Design and Implementation of Fast-Path Architecture for IPv6 Control Router
Authors: Wang Guang
Published: July 2014

In view of the difficulties of the current router architecture such as capacity, scalability, and power consumption, a fast-path architecture of IPv6 router suitable for parallel processing is proposed. The fast-path architecture of IPv6 router is designed and implemented using NoC structure. Thereby, a parallel processing structure of IP packets combining the distributed IP address lookup and the parallel IP packet switching is implemented. It is convenient to replace the search algorithm and to expand the hardware scale, and it can improve the overall performance of the router effectively.
Design and Implementation of University Parking Query System
Authors: Zhang Xiao Wu , Yu Bing
Published: July 2014

To conveniently find parking spaces for college staffs and visitors, the university parking query system is designed based on C/S architecture. By the design of automatically obtaining parking information based on image processing technology and the design of parking information inquiry, the system enables parking information exchange between Android mobile devices and Web server. It could improve the efficiency of parking spaces and also reduce the time spending on finding parking space.
Design of a Mobile Client Application Based on Android Platform
Authors: Qi Chang Xing
Published: July 2014

This paper describes the process and mothods of a mobile client application.The application uses JAVA, Google ADT, MyEclipse as the language and tools. and uses the MVC(Model-View-Controller) pattern. The main functions including news display;Blog showing, Blog comment; portal Information; Forum levy; Online login and so on. In addition, introduces the analysis and design of the application.
Multi-Domain Modeling and Co-Simulation Based on Modelica and Simulink
Authors: Tian Guang Shu , Zhang Li Chen
Published: July 2014

A co-simulation solution based on multi-domain modeling with Modelica is proposed to achieve the co-simulation of multi-domain modeling and simulation environment with other simulation environment . Based on the connection mechanism of multi-domain Modelica models the co-simulation under S-function co-simulation framework is implemented using the converting principle between Modelica models and Simulink modules. A co-simulation example between MWorks which is a multi-domain physical system modeling and simulation tool based on Modelica and AMESim indicates that the method can extend the application of Modelica models and achieve the collaborative work with multi-domain modeling and simulation tools and other simulation software.
The Design and Implementation of a Cross Platform Multimedia NetWork Classroom
Authors: Shao Meng Liang
Published: July 2014

For the sake of the technology of multimedia network classroom under cross-platforms is becoming popular, this paper propose a analytic selection on system architecture and the development solution on the multimedia network classroom for the experence and requirement from teaching activity. We chooses Java for system design and implementation to achieve the goal of crossing platform, using the C/S communicating paradigm, MVC model, and giving the detailed description on the development to some key modulars such as connection with maintenance, screen broadcast, file transfer and remote control.
The Research of Digital Challenge to Tourism Destination Brand
Authors: Zhang Wei Ya
Published: July 2014

Considering the tools, technologies and channels are driving significant change in customer behavior, the paper focus on how destinations are currently using them. Then the paper discusses the key challenges facing destination branding – content, socialization, integration, and measurement. At last, the paper considers what this means for destination brands, the DMO website and digital marketing strategy.
Implementation of Boundary Conditions in Discrete Element Modeling of Rock Cutting under Pressure
Authors: Tropin N.М. , Manakov А.V. , Bocharov O.B.
Published: July 2014

The article presents an algorithm to implement the confining pressure at a sample’s boundary when modeling a process of rock cutting with a single cutter under pressure. The dynamic process of cutting is modeled using a discrete element method in which the cutter geometry is presented by rigid walls and the rock sample is approximated as a set of separated spherical particles interacting in accord with a given law. The algorithm unifies two approaches to identify boundary spheres and setting forces that act on them. In the areas with particles of big radii, the plane-parallel beam method (shining lamp) is employed, while in the area of cutting that is made of smaller elements, the boundary is identified using the α-shape algorithm.
NAM Application for Simulation of Unsteady Separation Flow around Airfoil with Spoiler
Authors: Frolov Vladimir A. , Redkina Ksenia V. , He Liu
Published: July 2014

A Numerical-Analytical Method (NAM) and Discrete Vortices Method (DVM) are developed for simulating unsteady separated flow around an airfoil with a spoiler. For flow separated at each sharp edge, such as the spoiler tips and the trailing edge of the airfoil, a vortex sheet is used to feed discrete vortices at each time step. The solution is determined under the assumption of fluid being ideal and incompressible. This paper develops modeling behavior of the vortices around the airfoil with the spoiler. The NAM based into the combination of the DVM and TFCV (Theory Function of Complex Variable) that gives to increase the accuracy of the calculation. In this paper the variation of the separation zones for the unsteady separated flow are shown.
An Improved Weld Seam Extraction Method Using Saliency Detection for Pipe-Line Welding Based on GMAW and Passive Light
Authors: Zhou Pei Yun , Li Jing , Shen Ning Min , Li Fang
Published: July 2014

To meet the need of the automation and intelligence of welding process, it’s very important to extract the edge of weld seam accurately for seam tracking. According to the characteristics of GMAW (gas metal arc welding), an image sensing system of weld pool region based on CCD (Charge-coupled Device) is established. An improved method of weld seam extraction is presented. Firstly, weld pool region localization method using saliency detection is proposed, and weld seam region is obtained from the right edge of weld pool, then Sobel transformation and computation model is used to extract the edge of weld seam. Experimental results show that our method can obtain a more accurate weld seam edge and cost less than other method.
Application of Active Damping Control Using Piezoelectric Material in Modeling of a Wind Turbine Blade
Authors: Guo Da Wei , Xie Zheng Chao , Cheng Wen Li
Published: July 2014

On the basic of passive damping control, we do modeling and simulating in another approach to improve the vibration alleviating effect, the piezoelectric layer damping (PLD), which is called active control. The piezoelectric damping patches are under control of PID controller (matlab simulating) in voltage defference. Here, we use the software PRO/ENGINEER to design and model a wind turbine blade before using COMSOL to simulate the dynamic motion of the wind turbine blade and its interaction with aerodynamic force of wind in finite element method. Some different models are built-- the original turbine blade and the turbine blade with damping patches on different location and quantity. Then, according to the simulation results, we compare the effects of passive and active damping control, also the effect of patches locations and quantities under different wind speed. This research can provide a direction for future study about ways to decrease vibration of turbine blades.
The Study on the Influence of Gust Wind on Vehicle Stability
Authors: Wang Chen , Huang Hai Bo , Xu Shao Fang
Published: July 2014

In this paper, the vehicle driving characteristics are investigated under different Force level of gust wind based on the CFD theory. The distributed pressure acted on the vehicle side surface is equivalent to the six-component force on vehicle gravity center. The six-component force are explored and compared in different Force level of gust wind. The results show that the lateral force Fy and yaw moment Mz vary with v shape and shape under gust wind, respectively. The slopes of the result curves increase with greater Force level of gust wind. Gust wind gives most influence on Fy and Mz while has little effect on other component force. The work will provide a methodology for vehicle stability research under gust wind.
Establishing System Requirements of an Aviation Piston Engine
Authors: Kıvılcım Ersoy , Banu Beriş
Published: July 2014

This paper demonstrates how to establish the system level requirement set for an aviation piston engine, which is intended to be used for a MALE class UAV and for a Part 23 Normal category airplane. Here, it will be demonstrated, which requirements should be taken into account to construct the system level requirement set. This work is aimed to depict a methodology to create the system level requirement set.
Development of New Vehicle Power Integration System
Authors: Yu Cheng Chi , Chen Jia Shiun , Lee Yu Wei
Published: July 2014

This study developed a new hybrid power system which consisted of two continuous variable transmissions (CVT). By matching between the engine, motor, generator, and dual CVT system, this integrated power system can take advantages of components. The hybrid vehicle can be driven by the internal combustion engine (ICE) or electric motor (M) alone, or by these two power sources together when vehicle is driven in hard acceleration or high load. The integrated hybrid system could provide better fuel economy. The energy management of this integrated system controls the power systems based on rule-based control strategy to achieve better fuel economy. When the vehicle driving power demand is low, the ICE which is operating in the low efficiency region. The ICE is shut down, and the vehicle is driven by motor only. When the vehicle driving power demand is high, ICE would operate in the high efficiency region. The vehicle could be driven by ICE. This strategy would operate ICE only in optimal efficiency region to improve the fuel economy. In this research, the vehicle simulation model was built in Matlab/Simulink environment. The model simulation was according with the vehicle dynamics test, and the analysis and discussion of the simulation results was present.
Experimental and Numerical Study on Surface Damage of Dual-Phase Steel Sheet during Stamping
Authors: Yu Zhong Qi , Sun Li , Gao Jing
Published: July 2014

In this study, a U-channel bending test with tension were used to evaluate the surface damage resistance of dual-phase (DP) steel against heat treated Mo-Cr cast iron, and a numerical simulation model of the U-channel bending were developed to analyze the interface contact pressure on formed part that is an important influencing factor of surface damage. Investigation results for two bare steel sheets DP780 and DP590 demonstrate that DP780 steel showed more severe surface damage on formed part, and that for the steel DP780 greater interface contact pressure is induced as a result of effect of larger plastic deformation.
Influence of Thermal Decomposition of Ammonia Propellant in Solar Thermal Propulsion
Authors: Xing Bao Yu , Huang Min Chao , Cheng Mou Sen , Liu Kun
Published: July 2014

Solar thermal propulsion is a kind of space propulsion technology with great potential applications. Due to the difficulty of hydrogen storage in orbit, ammonia becomes an ideal candidate propellant as its stability and easier storage. In solar thermal propulsion system, the working temperature is usually above 2300K, and in this condition the dissociation of ammonia will occur. Thus, using ammonia as a single component propellant to compute and analysis the performance of thruster is not precise, and the mixture components produced from ammonia dissociation must be taken into account. In this paper a novel heat exchanger configuration with platelet technology is designed, and based on finite-rate chemical reaction method and computational fluid dynamics, the dissociation process of ammonia in the heat exchanger and nozzle is simulated. Then the influence to the specific impulse of the solar thermal propulsion system is comparatively analyzed. The simulation result indicates that the main productions of the dissociation are N2and H2, and the mole fraction of other components is small value that can be neglected. The specific impulse considering dissociation reaction is higher than not considering, so that this research can estimate the performance of solar thermal propulsion with ammonia propellant more precisely.
Study of Heat Rejection in Triple Natural Draft Dry Cooling Towers under Crosswind Using Radiator-Type Windbreakers
Authors: Hozhabr Amir , Radi Ramin , Chenari Hossein , Chogani Arash , Esmaeelipour Masoud
Published: July 2014

In this paper, the effect of crosswind on triple natural draft dry cooling towers is studied and analyzed. Concerning this area, many researches have concentrated on one cooling tower. This research focuses on the mutual effects of the adjacent towers' performance, and also makes a comparison between the efficiency of the three cooling towers in windy and no-wind conditions, using Computational Fluid Dynamics (CFD). In modeling the crosswind condition, at first solid windbreakers, and then radiator-type windbreakers are used for each cooling tower. Finally, the water outlet temperatures of the radiators' cooling towers are analyzed, and the total heat rejections at different conditions are compared. Numerical results show that radiator-type windbreakers can substantially improve cooling efficiency more than usual solid-types. It should be mentioned that a complete grid study is done to achieve a grid-independent solution.
Fluid-Solid Coupled Simulation of a Novel Platelet Heat Exchanger Used in Solar Thermal Thruster
Authors: Xing Bao Yu , Huang Min Chao , Cheng Mou Sen , Liu Kun
Published: July 2014

Solar thermal propulsion is a potential technology in aerospace applications, and it is a significant issue to improve the heat transfer efficiency of the solar thermal thruster. This paper proposes a novel platelet configuration to be used in the heat exchanger core, which is the most important component of solar thermal system. The platelet passage can enhance the heat transfer between the propellant and the hot core heated by the concentrated sunlight. Based on fluid-solid coupled heat transfer method, the paper utilized the platelet heat transfer characteristic to simulate the heat transfer and flow field of the platelet passage.The simulation result shows that the propellant can be heated to the design temperature of 2300K in the platelet passage of the solar thermal propulsion system, and the fluid-solid coupled method can solve the heat transfer in the platelet structure more precisely.
Numerical Study of the Temperature History of Thermally Protected Blunt Nose during Flight
Authors: Tahsini Amir Mahdi , Hosseini Seyed Amir
Published: July 2014

In the present work, the surface temperature history of a metal shell of the blunt nose of supersonic launch vehicle which is covered by a thermal protection coating is numerically predicted and compared with experimental data. The full Navier-Stokes equations are used to estimate the aerodynamic heat flux during flight, coupled with the governing equations for the thermal protection system to study the erosion rate and temperature variations. The results show the importance of the properties of the coating on accuracy of the numerical predictions.
Determination of Optimum Surface Distribution in Triple-Effect Evaporator
Authors: Chantasiriwan Somchart
Published: July 2014

Subjected to fixed total heat transfer surface area, the distribution of surface in multiple-effect evaporator affects the performance of the evaporator. Previous studies have been concerned with optimization of surface distribution with the assumption that no fouling occurs. The present study considers a more realistic case when the last-effect vessel is subjected to fouling. It is shown that, in order to consume the minimum steam exergy to produce a given amount of evaporation, the area of the last-effect vessel must be increased as the rate of fouling increases.
Charge Redistribution in Flextensional Piezoelectric Energy Harvesters
Authors: Yang Zheng Bao , Zu Jean
Published: July 2014

Harvesting ambient wasted energy has been in recent years a prominent research endeavor, aimed at providing alternative energy sources for low-power electronic mobile devices. Among various solutions, piezoelectric energy harvesters have attracted major attention due to the scalability, high-efficiency and the universal presence of vibration sources. In this paper, we studied the charge redistribution phenomenon in piezoelectric energy harvesters employing flextensional structures numerically and experimentally. A finite element model was developed firstly to study the mechanical and electrical response of flextensional transducers. The simulation results were then validated by a corresponding experiment. The research reveals that energy is dissipated in the process that charge flows from the high potential region to the low potential region. The electrode shape has a significant effect on the efficiency, and therefore should be considered fully when designing new energy harvesters. This study also assists in the design of flextensional sensors and actuators.
Application of MMAE to the Fault Detection of Lithium-Ion Battery
Authors: Liu Zhao , Sohel Anwar
Published: July 2014

With the advantage of high energy density, long cycle life and environmental friendliness, Lithium-ion battery has become a promising power source for hybrid and electric vehicles, which are liable to two kinds of failure, overcharge and overdischarge. Because of the capability of detecting multiple faults, Multiple Model Adaptive Estimation (MMAE) method was applied to a model-based fault detection of a lithium-ion battery with a two-order linear electrical model. Parameters that represent normal-mode and faulty-mode of the battery were obtained by a series of experiments, and three Kalman filters were designed thereafter. Finally, simulation verified the performance of the MMAE algorithm on fault detection of these two kinds of fault and it is shown that this technique is able to discern these faults rapidly and accurately.
Effect of Electrode Length on the Performance of EHD Gas Pump
Authors: Birhane Y.T. , Lin S.C. , Lai F.C.
Published: July 2014

The effects of electrode length on the characteristics of flow induced by an electrohydrodynamic (EHD) gas pump in circular pipe have been experimentally examined in this study. The gas pump has a diameter of 61.8 mm and uses eight evenly spaced emitting electrodes which are flush mounted on the tube inner wall. The gap distance between emitting and ground electrodes is fixed at 25 mm and two emitting electrode lengths (15 mm and 40 mm) are considered. Experiments are conducted using positive corona discharge with voltage varying from 17.5 kV to 23 kV. Several important implications from the present results for practical engineering applications are presented.
The Dependence of Carrier Distribution on Gate Capacitance of α-IGZO TFTs
Authors: Hsu Chih Chieh , Wu Chien Hsun
Published: July 2014

The capacitance-voltage (C–V) characteristics of inverted staggered amorphous indium–gallium–zinc-oxide thin film transistors (α-IGZO TFTs) with various dimensions are investigated by physics-based technology computer aided design (TCAD) simulation. For gate bias lower than the threshold voltage of the TFT, the electrons in the channel region are nearly fully depleted. It causes that the total gate capacitance is determined by the overlap region of gate, α-IGZO, and source/drain metals. When the applied gate bias is higher than the threshold voltage, the high electron density channel with density of ~6 × 1017 cm-3 and thickness of ~3-4 nm is observed near the interface of α-IGZO and gate dielectric. It results that the total gate capacitance is dominated by the gate to channel overlap. Quantitative analysis of the carrier distribution and energy band structures are utilized to study the physical mechanism underlying the C–V characteristics of the α-IGZO TFTs.
An Improved Low-Offset and Low-Power Design of Comparator for Flash ADC
Authors: Zhang Shuo , Wang Zong Min , Zhou Liang
Published: July 2014

This paper presents an offset-cancellation and low power cascaded comparator with new technique for flash Analog-to-Digital Converters. The improved structure cancels both input and output offset voltage by the feedback from outputs to common inputs. The total current consumption is reduced sharply for a clock circle with 1:2 dutyratio. The improved comparator is implemented in 0.35μm CMOS process. The Spectre simulation results show that the offset voltage of the improved structure is 3.14996mV with σ = 2.0347mV,and total current consumption is 17.59μA, while the offset voltage and total current consumption of the primary one is -5.649mV with σ = 14.254mV and 57.18μA respectively.
Fuzzy Classification Maximum Likelihood Clustering with T-Distributions
Authors: Yang Miin Shen , Lin Chih Ying , Tian Yi Cheng
Published: July 2014

Classification maximum likelihood (CML) procedure is a maximum likelihood mixture approach to clustering. In 1993, Yang first extended the CML to a so-called fuzzy CML (FCML), by combining fuzzy c-partitions with the CML function for a normal mixture model. However, normal distribution is not robust for outliers. In this paper we consider FCML with t-distributions and create a clustering algorithm, called FCMLT. Numerical examples and real data applications with comparisons are given to demonstrate the effectiveness and superiority of the proposed method.
A Simplified Branch-and-Price Mechanism for a Three-Machine Dynamic PCB Assembly
Authors: Yazdani Sabouni M.T. , Logendran Rasaratnam
Published: July 2014

A dynamic Printed Circuit Board (PCB) assembly system along with the most complete form of setup time in this assembly is introduced in this paper. An effective Branch-and-Price mechanism is employed to develop a lower bound for the three-machine problem. However, solving the sub problems remains computationally difficult because of their NP-hard nature. An optimal approach is established, which makes solving the sub problems computationally feasible.
Equating Heteroclinic Orbits in Chen System by Using Scaling Logarithm Change Series (SLS) Method
Authors: Khan Salah Ud Din , Khan Shahab Ud Din
Published: July 2014

In this paper, we have used the Scale Logarithm Change Series (SLS) method to reduce the boundary value problem in an infinite time domain to the initial value problem. In this method, we transformed time scale to logarithmic scale by using power series method for each governing point. These points are for each unknown functions and then equate with the corresponding coefficients. This paper demonstrates how the Scale Logarithm Change Series (SLS) method allows to obtain heteroclinic and monoclinic orbits in Chen system.The simulation results obtianed gives the reliability of newly developed algorithm which is extended to prolonged application of Chen system.
Classification Processing Method of Cotton Foreign Fibers Based on Probability Statistics and BP Neural Network
Authors: Wang Jia Fu , Du Yu Hong , Jiang Xiu Ming , Luo Yong Heng , Li Xing
Published: July 2014

A classification processing method of cotton foreign fibers was proposed based on probability statistics and BP neural network. Due to the origin was wide, the type was complex and the characteristic of cotton foreign fibers was different, it was difficult to build a model on classification and identification of cotton foreign fibers in the detection process of cotton spinning enterprises. This method could solve this question elegantly. Firstly, obtained the sample data by extracting the mean value of R, G, B in the fiber image and built a model about BP neural network. Then, classified 2-types cotton foreign fibers by calculating absolute value and variance of the feature vector based on probability statistics. Finally, processed the extraction features according to the different types image. The cross-validation experiment, the results show that the method combining the probability statistics and BP neural network can classify the cotton foreign fibers efficiently, and the effect is better when the types of cotton foreign fibers corresponding to the different features extraction methods The cross validation experiment, results showed that the combination can effectively identify the classification of foreign fibers and BP network based on probability and statistics, and different types of contton foreign fiber used different feature extraction methods, the effect is remarkable.
Optimization of Heat Treatment in Manganese Steel by Taguchi Method
Authors: Limooei Mohammad Bagher , Hosseini Shabnam
Published: July 2014

Manganese steels have extensively application in industries due to good resistance to wear, high work hardening capability with high toughness and ductility. Heat treatment is the main process to obtain desired mechanical properties and microstructure in this steel. The austenitizing temperature, the austenitizing time and the rate of quenching are the main factors in heat treatment. In this research, Taguchi analysis was used to determine optimal heat treatment for minimizing grain boundary carbide content with optimum hardness. Experimental variable chosen for this study included austenitizing temperature and time and the rate of quenching. In the optimization by Taguchi approach, L9(3)3 array, employing nine experiments, with three levels for each factor, was chosen for DOE. The austeitizing temperature and the cooling rate by changing in quenched solution were seen to have greatest influence on hardness of these steels.
Research on Recommendation System Selection Based on Fuzzy VIKOR with Multiple Distances
Authors: Sun Bao Wen , Li Ming , Zhang Wei
Published: July 2014

Nowadays, there are several different kinds of methodology in selecting recommendation systems (CRS), and every method has its own evaluation criteria to pick up the best one. In this paper, a new MCDM method for recommendation system selection based on fuzzy VIKOR with multiple distances is introduced. It selects the best system by calculating values using three different distance calculation methods, which are Hamming distance, Euclidean distance and Hausdorff distance, and voting via Condorcet method. It minimizes the effect of distance and offers a more objective result than other methods and helps enterprises to select the most suitable recommendation system.
Eigenfunctions of Rayleigh Wave in Viscoelastic Halfspace
Authors: Chang Dong Mei , Liu Xue Feng
Published: July 2014

In this paper, the eigenfunctions of Rayleigh wave in viscoelastic halfspace is studied. By comparing the eigenfunctions of Rayleigh wave in viscoelastic halfspace and the corresponding elastic halfspace, we found the penetration depth of Rayleigh wave in viscoelastic halfspace is always larger than in the corresponding elastic halfspace. But the difference is small. The ratio of penetration depth and wave length under different cases is calculated, the results show penetration ability of Rayleigh wave in viscoelastic halfspace is always stronger than the corresponding elastic case, and penetration ability of Rayleigh wave gets weaker when the Poisson's ratio is smaller. The penetration ability of Rayleigh wave is stronger when the Q value is smaller. The study in the paper is meaningful for the further research of Rayleigh wave in viscoelastic media.
Control of FES-Assisted Elliptical Stepping Exercise Using Fuzzy Logic Controller
Authors: Yahaya S.Z. , Hussain Z. , Boudville R. , Taib Mohd Nasir
Published: July 2014

This paper presents the implementation of a fuzzy logic controller (FLC) for an FES-assisted elliptical stepping exercise in stroke rehabilitation. The purpose of the system is to restore the function of the lower extremities for the stroke subject through the application of a Functional Electrical Stimulation (FES) in specified exercise technique. The physiologically-based muscle model is developed to represent the quadriceps muscle of the paretic leg. The FES-induced movement at the paretic leg and voluntary movement at the non-paretic leg is coordinated using a control strategy to achieve a smooth exercise movement. Simulation result verifying the control strategy is presented and discussed.
The Design of an Intelligent EEG Monitoring and Control System
Authors: Wang Ping , Xu Gui Zhi , Wang Lei , Liu Cheng Long
Published: July 2014

The core device of our system is a handheld EEG monitoring analyzer, which is based on a new DSP (Digital Signal Processor) control system. The DSP is based on a Think-Gear module and collects the EEG signals reliably. The system only uses a dry electrode, which ensures that the user can have a happy experience in daily life. Our main purpose is that we can provide a hardware prototype with the application of BCI (Brain-Computer Interface).The system can monitor the sleep process accurately and distinguish the eyes open or closed state, sleep state and the degree of relaxation.
Boiler Flue Gas Treatment of Cooling Water Circulation Device Control System Based on PLC
Authors: Wang Qiu Ping , Han Lei , Zhang Miao , Li Feng
Published: July 2014

Boiler flue gas treatment of cooling water circulation device is a device which can produce dilute sulfuric acid by absorbing SO2 in the flue gas of boiler combustion and add dilute sulfuric acid to the circulating water. Adding dilute sulfuric acid to the circulating water, can reduce pH value of the thermal power plant cooling water, obstacles and reduce the condenser fouling. This paper has introduced the working process of the boiler flue gas treatment of cooling water circulation device and the design method of the control system based on SIEMENS S7-300 series PLC. The control system realizes data acquisition of the water level and the pH value, and control the operation of each equipment according to the collected data. Finally realized the purpose of producing dilute sulfuric acid.
Robotic Impedance Control with Fuzzy Sliding Model Control Strategy
Authors: Huang Shiuh Jer , Yu Chiao Kuen , Huang You Min
Published: July 2014

During robotic assembly and interactive applications, the robot end-effector must follow a motion trajectory and exert an appropriate force profile against the contacted environment to provide a specified dynamic working compliance. It is a difficult control problem. Here, an embedded robotic control structure is constructed and the related hybrid control software programs are developed. The model-free intelligent fuzzy sliding mode controller is introduced to design force and position controllers, respectively for hybrid impedance control purpose. The experimental results are provided to demonstrate the effectiveness of the proposed hybrid impedance control system.
Design and Control Architecture of a Small Mobile Robot with Hybrid Locomotion System
Authors: Aisham Badrul , Bakhsh Qadir , Hasnan Khalid , Ahmed Aftab
Published: July 2014

This paper presents design and control architecture of a small mobile robot with hybrid locomotion system. It consist the combination of wheel and track type motion system resulting as a hybrid mechanism. The wheel locomotion system helps the robot to move on flat surface or path platform with high velocity, high manoeuvrability at low energy consumption. The track system is designed for rough and unstructured path, where robot need to cross irregular surface with high stability. This system works on interchangeable locomotion phenomena by means of track tensioner unit (TTU). The TTU helps the loading and unloading of track system by means of rack and pinion mechanism. This design of small hybrid mobile robot is improves robot applications and also enhance its flexibilty, verstality to work in multi type of terrains.
Defects Reduction in Steering Gear Product Using Six Sigma Methodology
Authors: Nithyanandam Ganesh Kumar , Raju Manmohanraj , Srinivasan Gokulraj
Published: July 2014

Lean Six Sigma is a disciplined data driven approach to improve the quality and the performance of a process or a system with which finally results to the profitability of a firm. Many of the organizations have adopted Six Sigma methodology to improve their quality and their performance to competitive industrial world. This work is concentrated with one of the leading Automotive component manufacturing company in South India. The main objective of this paper was to reduce the product defect with the application of Lean Six Sigma methodology. The paper follows the DMAIC methodology to investigate defects and its root causes and provide a solution to reduce and/or eliminate these defects. This paper also explores how a manufacturing process can use a systematic methodology to move towards world-class quality level.
Research on Assessing Airport Sustainable Development Ability Based on Particle Swarm Optimization Algorithm
Authors: Yuan Guang Hui , Fan Chong Jun , Yang Yun Peng , Huo Liang An
Published: July 2014

This paper focuses on assessing airport sustainable development ability. A new concept to evaluate the dynamic work on sustainable development is proposed, which is defined as airport sustainable development capacity as well as the status quo of Shanghai airport. The index system of airport sustainable is given, which includes Operational, Social, Environmental, Resources and energy system. The Airport Sustainable Development Comprehensive Index (ASDCI) is proposed, and investigates the parameter with Particle Swarm Optimization. Found that there was a marked improvement of Shanghai airport sustainable development by empirical analysis, especially the Environmental, Resources and energy. This mode has used in shanghai airport’s sustainable development evaluation system.
Differently Defined Flying Zone and State Approach in Case of Airborne Volcanic Ash: Impact on Flight Operations
Authors: Vujasinović Ružica , Kuenz Alexander , Schmitt Angela R.
Published: July 2014

Current European regulation that allows flying in forecasted, differently contaminated, volcanic ash zones as long as specific Safety Risk Assessment (SRA) is approved has the goal to reduce adverse impact that volcanic ash ejected in the atmosphere can have on air traffic management (ATM). However, the European States do not have unique understanding of this approach meaning that, in a few cases, States still decide to close their airspace in case of ash presence. Therefore, in this contribution, we analyze how definition of flying area within SRA and different State’s approach affect operations. We use volcanic ash data from the International Civil Aviation Organization’s (ICAO’s) volcanic ash exercise (VOLCEX13/01) and daily European traffic for simulation.
Synchronization and Parameter Identification of General Uncertain Complex Networks via Discrete Control
Authors: Jiang Sheng Qin , Cai Guo Liang , Cai Shui Ming
Published: July 2014

This paper studies synchronization of complex networks with multi-unknown parameters and disturbances via discrete control. Based on Lyapunov stability theorem and the stability analysis of impulse system, adaptive-impulse synchronization criteria for general multi-uncertain complex networks have been established. Finally, a numerical simulation is provided to support the theoretical results.