bluuebunny/crossref_metadata_2025 huggingface dataset:
The Use of Online Technology to Facilitate Pre-Service Teachers' Engagement and Cultural Competency Development during an International Field Placement
Authors: Boury Tiffany T. , Hineman John M. , Klentzin Jacqueline Courtney , Semich George W.
Published: September 2013

Student teaching abroad is becoming increasingly popular in many colleges and universities in the United States. This experience can be highly rewarding in terms of developing pre-service teachers’ culture competency, yet can pose challenges for faculty monitoring such placements. Stewart and Kagan (2005) suggest a framework for teacher preparation programs that have recognized the value of international experiences gained when students participate in host countries’ classrooms. This qualitative research collective case study examined the use of a wiki discussion forum as a technology supported communication tool rooted in engagement theory for pre-service teachers to better communicate reflections, questions, or concerns they may have in working with their students during international pre-service teacher experiences. This paper reports the results of an analysis of data collected from an instructor-prompted wiki discussion board used by three student cohorts that participated in international field placements. Results indicated that online technology facilitated student engagement in the experience and that the international placement fostered the development of their cultural competency.
Analysis of Various Structures of Standards Setting Organizations (SSOs) that Impact Tension among Members
Authors: Seo DongBack
Published: September 2013

As the field of ICT standardization has changed from a relatively static, monolithic environment into a very dynamic field in the last two decades, many formal standardization bodies, fora, consortia and other types of standards setting organizations (SSOs) have emerged. These SSOs have often competed against each other for the same application areas. To a large degree, these changes reflect developments in the field of telecommunications and IT themselves, including liberalization, globalization, rapid changes in technology, and convergence. More than ever before, firms can choose which standard setting body they want to join. Nevertheless, data shows that many firms decide to be members of many relevant bodies at the same time. The aforementioned changes and the multi-SSO memberships of a firm have differently influenced various types of stakeholders, which increases potential tension among members during standardization processes. This paper intends to study such tension and the effect influenced by the structure and processes of the standard-setting bodies themselves. A framework to analyze tension within given organizational structure and processes based on Giddens’ Structuration Theory is proposed. The appealing feature of this theory is that it is neither deterministic at the agent level nor at the structural level, but takes iterative influences between both levels as a starting point. This study shows how a SSO struggles to decrease tension among members and suggests propositions related to the tension that academia and practitioners can apply.
Responsible Innovation and Standardization
Authors: van de Kaa Geerten
Published: September 2013

The fifth ITU-T Kaleidoscope event themed on Building Sustainable Communities took place in Kyoto, Japan, on 22 April – 25 April 2013. It consisted of seven regular paper sessions, one poster session and two special sessions. This paper provides a summary of the special session on responsible innovation, value sensitive design and standardization for smart metering in the context of smart grids that was organized on 24 April 2013.
An Empirical Investigation into the Influence of Knowledge Sharing Barriers on Knowledge Sharing and Individual Innovation Behaviour
Authors: Yeşil Salih , Hırlak Bengü
Published: September 2013

Knowledge sharing barriers reduce the propensity of individuals to share knowledge and produce innovation behaviour. Thus, identifying barriers and their impact on knowledge sharing and individual innovation behaviour is a potential research area to study. Considering lack of studies in the literature, this study provides further evidence regarding the implications of knowledge sharing barriers in the workplace. Data was collected from eighty three academic staff in a higher education institution and analysed with Smart PLS. The results showed that organisation related knowledge sharing barriers are negatively related to knowledge collecting and knowledge donating. The result also indicates that individual knowledge sharing barriers have negative effect on individual innovation behaviours. There was no link found in this study between knowledge sharing and individual innovation behaviour. These findings provide empirical evidence to the further development of knowledge management and innovation research, and insights regarding how to better implement knowledge sharing and foster innovation behaviour in organisations.
Eliciting Security Requirements for an Information System using Asset Flows and Processor Deployment
Authors: Kaiya Haruhiko , Sakai Junya , Ogata Shinpei , Kaijiri Kenji
Published: September 2013

The authors cannot comprehensively determine all of the vulnerabilities to an attack only from requirements descriptions. To resolve the problem, the authors propose a method for eliciting security requirements using the information about system architecture. The authors convert a use-case description into a variation of a data flow diagram called an asset-flow diagram (AFD). The authors then refine the AFDs based on a processor deployment diagram (PDD), which gives information about a system architecture. By using vulnerabilities patterns to an attack, the authors distinguish vulnerabilities to the attack that can be identifiable in AFDs from remaining vulnerabilities to the attack. To prohibit the former vulnerabilities, security requirements are defined as countermeasures and/or modification of existing requirements. To prevent the latter vulnerabilities, security requirements are defined as design and implementation constraints. Through an evaluation of a web application, the authors show that our method enables us to elicit security requirements against several different attacks in different system architectures.
The Effect of Nose Bluntness and Forebody Strakes on Aerodynamic Characteristics of Air-Launched Rocket Model
Authors: Zhang Yan Hua , Li Hua Xing , Zhang Deng Cheng , Qu Liang
Published: September 2013

In this paper, the aerodynamic characteristics of the rocket model that might be used in a cabin air-launched system have been studied through experiments in low speed wind tunnel. The angle of incidence range is 0-80°, and the speed is 17m/s or 25m/s, including typical flight conditions prior to engine ignition. Forces and moments were measured through six-component balance. It is found that vortex asymmetry appears under certain condition with zero side slip. Asymmetrical phenomenon leads to larger side force and yaw moment, which can affect the trajectory of the rocket and put the carrier aircraft at risk. In addition, changes in regulation of the pitching moment with angle of attack are important to longitudinal stability, so the model with convergent-expanded afterbody was designed to improve stability. The effects of nose bluntness and forebody strakes on side force and yaw moment were presented, and the differences of aerodynamic characteristics with pointed and blunt nose, with and without forebody strakes were described. Results show that nose bluntness delays the appearance of asymmetric vortex, and the maximum side force is reduced by at least 50%. The forebody strakes reduce side force and yaw moment by weakening the asymmetric vortical interactions. The results can provide some references for designing the cabin air-launched rocket.
Research of Hard Fault Diagnosis Simulation Platform of Aero-Engine's Key Sensors Based on Neural Network
Authors: Sun Zhao Rong , Sun Yi Gang , Sun Chun Lin Sun
Published: September 2013

The purpose of the research is to establish a fault diagnosis model of the aero-engines key sensors using the artificial neural networks to replace the engines mathematical model, so as to establish a hard fault diagnosis simulation platform to monitor the performances of the engine sensors on real-time, to judge the engine failure mode timely, and to locate the fault type of sensors accurately. By analyzing the correlations of the parameters that affect the conditions of the engine, a three-layer BP network model is established. The related QAR (Quick Access Recorder) data are used to simulate and analyze the models using the MATLAB. Combined with the characteristics of the hard failure of the critical engine sensors and the correlation of the parameters, the fault diagnosis simulation platform is established. Then, the parameters of the normal engine and the failure engine are used respectively to evaluate and validate the platform. The simulation results show that the platform can judge the critical sensors faults of the engine accurately, and can locate the type of sensors reliably.
Establishment of Tooth Profile Curve Mathematical Model of Varying-Coefficient-Shift-Modification Gears
Authors: Zhang Chuan Yan , Han Ji Guang
Published: September 2013

According to the law that modification coefficient changes with the position of the pitch-lines of gears, varying-coefficient-shift-modification gear is designed to eliminate backlash in gear transmission effectively. The tooth profile curve of varying-coefficient-shift-modification gears is obtained by generating rack, based on the theory of rack cutting method. The modification amount changing with the position of the pitch-lines of gears is obtained separately, and then added to standard rack, to obtain the model of generating rack. Finally,the model of generating rack and the pure-rolling model are joined together by using the established equation of no clearance mesh, to get the mathematical model of tooth profile in the coordinate system of the gear. For varying-coefficient-shift-modification gear in the transmission of eccentric involutes gears, the kinematics analysis of the model is conducted through the joint of MATLAB, Pro/E and ADAMS, to verify the effectiveness of the modeling method and the correctness of the mathematical model.
The Role of Hydroxide Ions in the Synthesis of Ni Nanoparticles Using High Temperature Polyol Method
Authors: Nik Roselina Nik Roseley , Aziz Azizan , Hyie Koay Mei , Mardziah C.M. , Kalam A. , Saad N.H. , Salleh Z.
Published: September 2013

This study investigate the role of hydroxide ions (OH-) in the synthesis of Ni nanoparticles through polyol method at the temperature of 180°C. Ni nanoparticles were prepared using ethylene glycol (EG) as the solvent and hydrazine (N2H4) as the reducing agent. Sodium hydroxide (NaOH) was used to introduce the OH-in solutions. Amount of OH-has been controlled through manipulation of OH-/Ni2+ratios. The role of OH-has been discussed in terms of size, morphology and reaction rate. Particles size and morphology were determined by Transmission Electron Microscopy (TEM). X-Ray Diffractometer (XRD) was used to verify the chemical composition of as-synthesized particles. The results demonstrated that at temperature of 180°C, Ni nanoparticles can be synthesized even without the existance of OH-. Although there no significant particles size changes,synthesis without OH-showed the most rapid reaction as compared to samples with OH-. Probable mechanisms for formation of Ni nanoparticles with and without OH-are also discussed. This finding contribute to a new rapid and facile synthesis of Ni nanoparticles.
The Impact of Electric Hybrid Compressor to Make Transport Environmentally Friendly
Authors: Bajerlein Maciej
Published: September 2013

This paper presents the investigations, whose aim was to determine the influence of the operation of electric and mechanical compressors on the energy consumption of city buses in public transport. The tests were performed on pneumatic systems used in city transit vehicles whose underlying component is a compressor generating pressure for the brake and suspension systems. Owing to the application of a portable analyzer - SEMTECH DS the emissions (with a secondly resolution) of CO, HC, NOx, CO2in the exhaust gases were measured. The on-road emission tests were performed in the actual operating conditions in SORT driving tests. These tests reflect the actual vehicle operation in a real task through preset procedures of their realization and measurements determining the energy consumption and exhaust emissions or the influence of the vehicle accessories and all variables (vehicle speed, engine load, acceleration or distance covered) on the total energy balance. The on-road tests were performed on a runway of the Bednary airstrip in Poland.
Research on Rotor Field Oriented Control of Dual-Three Phase Induction Machine
Authors: Li Li Hong , Long Fei , Yin Jin Jun , Wang Bang Qi
Published: September 2013

In this paper, the mathematical model of dual three-phase induction motor is constructed based on space vector decomposition. The rotor field oriented control of the motor is then proposed. The simulation model of the motor is constructed in Matlab/Simulink/PLECS software. Simulation systems of the start-up transient and the rotor field oriented control of the motor are established. The simulation results validate the model and the effectiveness of the proposed control method.
Analysis and Optimization of Electro-Hydraulic Proportional Speed Synchronous System Based on AMESim
Authors: Xie Ning , Chen Peng Wei , Guo Jin Jin , Chen Xi , Wen Bin
Published: September 2013

The system models for analysis and optimization of an electro-hydraulic proportional synchronous system is presented based on AMESim. This paper studies the control strategy for the improvements of the response time, steady-state accuracy, stability and synchronization of the system. The speed of a hydraulic motor can be controlled through regulation of the PID controller by the genetic algorithm. Simulation results show that performances of the system have been improved and expected results can also have been obtained.
Power Flow Calculation Based on Power Losses Sensitivity for Distribution System with Distributed Generation
Authors: Li Na , Li Yong Gang , Zhou Qing Jie
Published: September 2013

The introduction of distributed generation (DG) into distribution network will greatly impact on its operation and security inevitably, load flow calculation with distributed generations is the basic premise for the optimization planning and operation of distribution network, so the power flow in distribution network containing DG should be calculated .This paper analyzes several common DG in the former back flow calculation and mathematical model, with the first generation method fail to deal with PV node problem, improves back/forward substitution method based on node-layer, the branch search method is presented to form node impedance matrix to modify the PV node reactive injection. so that it can effectively deal with PV nodes, and the program written by matlab7.1, several schemes are designed for the different modes of DGS and are tested in IEEE33 node system and verifies the feasibility of the method, the reliability of the program.
A Cyclic Plasticity Model for Advanced Light Metal Alloys
Authors: Kourousis Kyriakos I.
Published: September 2013

Advanced light metals have recently attracted the interest of the aerospace and automotive industry. The need for accurate description of their cyclic inelastic response under various loading histories becomes increasingly important. Cyclic mean stress relaxation and ratcheting are two of the phenomena under investigation. A combined kinematic isotropic hardening model is implemented for the simulation of the behavior of Aluminum and Titanium alloys in uniaxial mean stress relaxation and ratcheting. The obtained results indicate that the model can perform well in these cases. This preliminary analysis provides useful insight for the evaluation of the models capabilities.
The Design of Pulse Detection System
Authors: Li Lian , Li Kai
Published: September 2013

Because the existing pulse signal acquisition system cannot measure pulse pressure accurately, this article designs a hardware circuit which adopts AT89C51 as the core to adjust pulse signal condition by acquiring pulse signal with the piezoelectric sensor. The system can filter the noise of signal through wavelet transform. Combining with virtual instrument technology, the circuit can manage and display the pulse waveform smoothly, and finish abnormal alarm and spectrum analysis, etc. A pulse waveform database is set up, which lays the foundation for extracting the waveform characteristics to analyze humans physiological characteristic. Compared with traditional instrument, the new system hardware is based on the development of virtual instrument, which greatly shortens the development cycle and cost, having the characteristics of versatility and ease of development maintenance.
Design of Elevator Logic Control System
Authors: Zhang De Min , Liu Hong Jin
Published: September 2013

This paper provides a good method to improve the safety and reliability of elevator logic system. It uses watchdog timer to prevent code-execution errors, 3-phase sequence detector to check for an incorrect phase sequence or missing phase voltages, and DC brake current sensor to measures the flow of current through the brake coil to avoid any damage on the drive-brake system.
Based on MCF52234 CAN/Ethernet Gateway Design and Research
Authors: Guo Yu Xi , Li Guo Hong , Li Shuai , Li Ming
Published: September 2013

With the development of network information technology, industrial control system takes higher and higher requirement to automation. In order to achieve the seamless connection between the bottom field device and external, the MCF52234 CAN/Ethernet gateway design scheme based on MCF52234 is proposed in this paper. The freescale MCF52234 chip is chosen as the microprocessor. This paper expounds the CAN/Ethernet gateway hardware design, and presents the gateway protocol conversion software design, achieves the communication between CAN bus and Ethernet. Test results show that the embedded CAN/Ethernet gateway fulfills the anticipated requirements, has high transmission rate, good real-time performance.
An Electrochemical Sensor for DNA Detection Based Metal Nanoparticle Modified with Cyclodextrins
Authors: Fan Hao , Cheng Lin , Cui Han Feng
Published: September 2013

We herein constructed a sensor that converts target DNA hybridization-induced conformational transformation of the probe DNA to electrochemical response based on host-guest recognition and nanoparticle label. In the sensor, the hairpin DNA terminal-labeled with 4-((4-(dimethylamino) phenyl) azo) benzoic acid (dabcyl) and thiol group was immobilized on Au electrode surface as the probe DNA by Au-S bond, and the PdS nanoparticles surface-modified withβ-cyclodextrins (PdS-CDs) were employed as electrochemical signal provider and host-guest recognition element. Initially, the probe DNA immobilized on electrode kept the stem-loop configuration, which shielded dabcyl from docking with the PdS-CDs in solution due to the steric effect. After target hybridization, the probe DNA underwent a significant conformational change, which forced dabcyl away from the electrode. As a result, formerly shielded dabcyl became accessible to host-guest recognition betweenβ-cyclodextrin and dabcyl, thus the target hybridization event could be sensitively transduced to electrochemical signal provided by PdS-CDs. This host guest recognition-based electrochemical sensor has been able to detect as low as picomolar DNA target with excellent differentiation ability for even single mismatch
The Design of Temperature-Controlled of Wood Drying Remote Monitoring System Based on Fuzzy PID
Authors: Jun Yu Li , Liu Shao Ying , Wang Hui , Qin Shu
Published: September 2013

Effective temperature control plays a key role in remote monitoring of wood drying. This paper analysis and design a fuzzy PID control strategy under the monitoring and control system by establishing the mathematical model of wood drying system. It can realize the remote communication by using RS485 and achieve the actual operation of the monitoring system control. By experimental data and the experimental curve, the temperature of the system has good tracking effect which can be verified. It can achieve effective remote monitoring.
Simulation and Optimization of NGE-MR Natural Gas Liquefaction Process
Authors: Zhang Lei , Che Li Xin , Bi Sheng Shan , Wang Hui Shi , Wu Jiang Tao , Qiao Jia , Meng Xian Yang
Published: September 2013

With the increased utilization of natural gas, there has been an increase in the research on peak-shaving natural gas liquefaction technologies. The NGE-MR natural gas liquefaction process, which precools natural gas with the cold energy generated by high pressure natural gas pipeline pressure energy recovery, is a promising technical candidate for peak-shaving LNG facilities. In this study, the effect of high pressure of the mixed refrigerant cycle (MRC) on the performance of the NGE-MR liquefaction process is analyzed under a fixed MRC pressure ratio. The result shows that for a certain mixed refrigerant composition, there is a corresponding optimal high pressure of the MRC, under which the minimum specific power of the liquefaction process could be obtained. The minimum specific power should be regarded as the evaluating indicator to represent the performance of the mixed refrigerant composition. Finally, the effect of mixed refrigerant composition on the performance of the NGE-MR liquefaction process is analyzed and the optimal operating conditions for the NGE-MR liquefaction process are obtained. As a result, the required specific power at the optimal operating conditions is less than 0.23 kW·h·kg-1 and is decreased by about 24% compared with the specific power of C3-MR natural gas liquefaction process.
Modeling and Analysis of Plunge Milling Force Based on Orthogonal Experiment
Authors: Niu Xing Hua , Meng Xian Li , Zhang Zhen Tao , Zhao Rui , Shen Bo Fei
Published: September 2013

Plunge milling force experiment was designed based on the method of orthogonal experiment, selecting Cr12 mold steel as the experimental material for obtaining the measurement data. Combined with the experimental data, the empirical formula of the milling force model and BP neural network model were established respectively. The two types model are analyzed and compared. The results show that the BP neural network model has a better prediction effect than traditional empirical formula.
Automatically Extraction of Lineaments from DEM
Authors: Liu Chun Xue , Tan Liang , Ni Chun Zhong , Yan Yong Feng
Published: September 2013

Faults, which role greatly in the generation and spatial distribution of mineral resources, are always related to the lineament interpreted from remote sensing data. This paper introduces an improved segment tracing algorithm (STA) to interpret lineament from remote sensing data (DEM) in Gejiu tin mine, China. In this analysis, a lineament is treated as a straight line in the horizontal plane and its dip is not considered. A fault is created by connecting several lineaments, which appear to belong to the same system, using the criteria of distance and directional angle. The proposed method was applied to mines in Gejiu tin mine, a area of Triassic limestone with tin mine. A correlation exists between interpreted fault orientations and (1) the predominant azimuth of joints appearing on the tunnel walls of a tin deposit in the limestone area and (2) the orientation of main tin deposits. Furthermore, the proposed method is capable of calculating the intersection pattern of fractures at an arbitrary level below the ground surface.
Experiment Study on Force of Hoisting Triangular Gate of Ship Lock in Tidal Reach
Authors: Wu Teng , Ding Jian , Wu Ling Li
Published: September 2013

A physical model of Jiaogang Ship Lock is established in the paper. Through model test, the force of triangular gate under the condition of opening is studied. The result shows when the upper water level is high water control and when absolute value of upper-lower tidal range is less than 0.5m during the spring tide flux and reflux in the flood season of the Yangtze River in the flood year, the ship lock gate can be opened. When the upper water level is medium water control, the absolute value of upper-lower tidal range to open the ship lock gate should be less than 0.4m. And when the upper water level is low water control, the critical tidal range value is also less than 0.5m.
Fabrication and Design of Customized Maxillofacial Biomodel for Implant Using Computer Aided Design and Rapid Prototyping Technique
Authors: Way Wan Yusoff , Aichouni M. , Zulkiflee M. Zul Amzar , Ahmad Derifaee Mohd Sallehuddin
Published: September 2013

The purpose of this research is to fabricate bio-model that based on Rapid Prototyping technology which is by using Fused Deposition Modeling (FDM) and designing an implant by using a Computer Aided Design technology. A case study from Hospital Kuala Lumpur which is the maxillofacial will be fabricated by using FDM technique. The completed 3D prototype or biomodel will be analyzed to makes the result more truthful in terms of the dimensional accuracy, operational error and cost analysis. Computer aided design technology is used to design the customized implant in order to replace the fractured maxilla part.
Test of Multiple Breaks in Long Memory Process: An Unknown Mean Breaks Case
Authors: Deng Lu
Published: September 2013

This paper extends Bai and Perron (1998) multi-unknown breaks method to long memory process, analyzes the finite sample property of the method (mean, variance, the test performance of Sup-F statistics) and the relation with the fractional integration parameter, size and location of break point. One and two unknown mean break and various long memory situations are considered. It found that expect for the condition that fractional integrated parameter d approaches to 0.5, BP method is fairly exact to estimate the break point, the bias is relatively small and the power and size of the Sup-F test is acceptable. Especially when d is negative, this method shows outstanding statistical property, small bias and standard deviation, and perfect test power and size.
Sliding Mode Control of Servo System with Brushless DC Motor Based on Nominal Model
Authors: Wang Fan , Su Yi Xin , Min Hong , Long Fei
Published: September 2013

For brushless DC motor with parameter uncertainties and load disturbances in the practical servo system such as numerical control machine (NCM), a novel sliding mode control algorithm is proposed. This control algorithm consists of two controllers. One is the sliding mode controller for practical plant to ensure robustness against parameter uncertainties and load disturbances, the other is the backstepping controller for nominal model to compensate the position error for practical servo system. The Lyapunov approach is used to prove the convergence of the controllers.At last, The simulation results of nominal model-based sliding mode control algorithm show that it has high robustness and good position tracking performance with respect to parameter uncertainties and load disturbances.
On Controllability and Output-Controllability of a Class of Remote Learning Discrete Control Systems with Data Dropout Compensation
Authors: De la Sen M. , Alonso-Quesada S. , Ibeas A.
Published: September 2013

This paper discusses the controllability and output controllability properties of a linear control system subject to transmission errors from a tandem of remote controller and measurement sensor to the actuator subject to Bernouilli statistics. The controlled system incorporates a hierarchical control structure where the lower control level is a learning numerical control while the high control lever is a classical discrete feedback control acting at sampling instants. The controlled system is able to compensate certain missed data through the use of finite size fixed memory storage arrays which store the last valid data which has been transmitted so as to replace the current missed one in the control structures.
Contour Extraction Based on Improved Snake Model and its Application in Vehicle Identification
Authors: Liu Shu Min , Huang Ying Ping , Zhang Ren Jie
Published: September 2013

Contour curve is an important shape feature for vehicle recognition and it is a hard work to extraction it from complex dynamic traffic video for in-vehicle detection system. Snake Model is used to automatically extract the object contour curve proposed by Kass et al, but it is inability for traffic objects. Presented here is a novel approach for extracting vehicle contour curve by combining stereo vision with Snake Model. In this paper, Stereo vision is first used to segment vehicle from traffic background, then Snake Model is adopted to obtain complete contour curve. In view of classical Snake model is easily affected by noise, here we propose a improved Snake model by combining corner detection technology with Distance Potential Snake Model. Moreover, a vehicle identification method based on contour curve is presented. The method presented here was tested on complex traffic scenes and the corresponding results prove the efficiency of our proposed method.
Frequency Domain Analysis of Fluidized Beds with Vibration Time Series of the Bed Wall
Authors: Norouzi H.R. , Azizpour H. , Zarghami R. , Chaouki J. , Mostoufi Navid
Published: September 2013

Monitoring of fluidized beds operation is important in industrial applications. Collecting fluidize bed wall vibration is a non-intrusive method that can be used to characterize bed hydrodynamics. In the present work, the vibration of a lab-scale fluidized bed was measured at different operating conditions as well as the empty bed. It was shown that vibration of the empty bed is as significant as that of the fluidized bed. Therefore, the vibration signal was decomposed into two distinct signals, coherent and inherent signals. The inherent signal was used to reflect the bed hydrodynamics. The power spectral density of inherent vibration signal showed that the increasing aspect ratio of the bed leads to an increase in the intensity of vibrations especially at high frequencies. Moreover, there are first, second and so forth harmonics for which their intensities decrease as the frequency is increased.
Adaptive Corner Detection Based on Direct Curvature Scale Space
Authors: Liao Bin , Sun Hui Ying , Xu Jun Gang
Published: September 2013

Corner detection based on global and local curvature properties is an advanced method for detecting corners in images, which is a fundamental composition of many algorithms. However, we find that it is time-consuming for real-time applications and might detect wrong corners or lose some important corners. To alleviate these problems, we propose an improved curvature product corner detector with dynamic region of support based on Direct Curvature Scale Space (DCSS). Firstly, we use direct curvature scale space to reduce the complexity of computation instead of curvature scale space. Secondly, multi-scale curvature product with certain threshold is used to strengthen the corner detection. Finally, we check the angles of corner candidates in the dynamic region of support in order to eliminate falsely detected corners and use an adaptive curvature threshold to remove round corners from the initial list. The experimental results show that our proposed method improves the performance of corner detection both on accuracy and efficiency, and gain more stable corners at the same time.
Realization of Multi-Frequency Multi-Polarizationtechnique in Radar
Authors: Mo Cui Qiong , Chen Qiu Ju , Dai Huan Yao
Published: September 2013

Two realization methods of multi-frequency and multi-polarization technique in radar are proposed. One is design of multi-carrier-multi-polarization radar signal, and the other is design of multi-band-multi-polarization filter bank. The consistence of spectrum and polarization properties between them is derived in principle, and simulation experiments are carried out to verify the conclusions at last.
Communication with Computer via Virtual Port
Authors: Du Gang
Published: September 2013

The paper introduces the classical communication method used by computer and how to realize the communication by virtual parallel and serial port based on the USB port and Windows operation system. It also gives out the hardware design to create the virtual port and the detail to use the virtual port.
Design of Dual PON-MAC ONU Dedicated for Communication System of Power Distribution and Utilization
Authors: Yu Qiang , Yu Peng Fei , Huang Hui , Chen Wei , Ren Jie , Huang Zhi
Published: September 2013

With the development of smart power grid technology, EPON has become a popular communications technology both in power distribution and utilization automation. The article analyses several communication path protection methods of EPON system, then introduces the development of a dual PON-MAC ONU for such application, both hardware and software design are discussed. At last, A group of test data which verify the performance of fast protect switchover is given..
Improved Algorithm Based on the DFT Transform Channel Estimation and Threshold Filtering
Authors: Ma Chao , Xiao Chun Xian , Zhu Jiang
Published: September 2013

In channel estimation, the complexity of the DFT-based channel estimation algorithm is lower than the MMSE algorithm, and the DFT-based algorithm performs better than the LS algorithm. However, due to that the traditional algorithms simply considered all the samples to be useful channel impulse response, ignoried the effect of noise. Therefore, the algorithm could be improved. This paper presents an improved algorithm based on twice noise estimation theory. The algorithm uses the sequence of points other than the cyclic prefix length to estimate the noise variance firstly, and then use the estimated noise variance to distinguish the noise samples within the cyclic prefix length. The computation of the new noise variance and noise mean through the new noise points as a threshold filters the impulse response of the channel in time domain and eliminates the impact of noise on the system further. The simulation result shows that the improved algorithm performs better than the traditional algorithm.
An Adaptive and Blind Watermarking Algorithm Based on Shearlet Transform
Authors: Xu Jing
Published: September 2013

In order to fully utilize the character of Shearlet transform that it can represent the image sparser, an adaptive and blind watermarking algorithm is proposed. The parity of the number of the high-frequency coefficients in the same subdivision window which values are zero is used to embed the watermark signal. If the watermark is an odd number 1, then keep the number of zeros of the high-frequency coefficients odd; else if the watermark is an even number 0, then keep the number of zeros of the high-frequency coefficients even. Simulation results show that the algorithm is feasible and fairly robust,and it maintains satisfying transparency. The algorithm can be widely used in copyright protection of digital information.
Evaluation from First Principles the Structural Stability of Mg Containing Different Amounts of Al Atoms under High Pressure
Authors: Liu Qiu Xiang , Zhang Rui Jun , Lu De Ping , Atrens Andrej
Published: September 2013

The structural stability and phase transition of magnesium (Mg) containing different amounts of Al under high pressure was studied by means of first-principles total energy calculations. The cohesive energy calculations showed that the hcp and bcc structures of Mg-4.17 at%Al and Mg-8.33 at%Al were of the strong structural stability. The enthalpy for hcp and bcc structures of Mg was dependent upon the Al content. With increasing Al content from 0 to 8.33 at%, the enthalpy for hcp and bcc structures increased monotonously. Based on the enthalpy differences of the hcp and bcc structures under different pressures, the phase transition pressure under which the hcpbcc structural phase transition may take place for pure Mg, Mg-4.17 at%Al and Mg-8.33 at%Al was 60 GPa, 70 GPa and 85 GPa, respectively, indicating that with the increasing Al content, the phase transition pressure became higher and the hcpbcc transition was more difficult.
The Research and Application of the Heat Meter with Infrared Data Communication Technology
Authors: Li Yu Sen , Wang Jun Qin
Published: September 2013

In the paper, we make a simple discussion to the heat meter verification process, this paper introduces the working principle of the infrared data communication, explains the advantages of using infrared communication, and explains the heat meter according to heat meter using infrared optical reading device data communication protocol the reading table data process, the analysis process in detail. Heat meter is expounded a good development trend of the application of infrared data communication.
Design of the Upper Computer System in the Overhead Crane Wireless Data Management System
Authors: Li Jun Fang , Zhang Peng , Gao Qiang , Chen Sha Sha
Published: September 2013

Aiming at the problems of data messy, data unshared and thus the process control unsmooth and management efficiency in the work of crane, a wireless data acquisition system was designed based on the industrial wireless transmission equipment Nissei ND250 digital radio. To design the weighing data management software using Visual Basic6.0 combined with database, and to connect the digital radio by using MSComm, this system can realize the seamless connection of each substation and control center. In addition, to collect the various parameters into compute, it can complete the data analysis and storage. Nowadays, there is no example of the application in crane using digital radio. This method is very important to develop the technology in other areas.
An Experimental Study on the Particle Concentration and Size Distribution of Smoke Generated by Flaming N-Heptane
Authors: Li Yao Dong , Chen Du , Wang Feng , Yuan Wei , Zhang Qi Xing , Zhang Yong Ming
Published: September 2013

The particles of smoke generated by flaming n-heptane was measured by Fast Particulate Spectrometer (DMS500), and the particle number concentration and size distribution were recorded and analyzed for investigating the smoke dynamic characteristics. The experimental results indicated that the particle number concentrations of buoyant plume above the flame approximately decrease with the height. At the center of ceiling, there is an approximate linear relationship between the particle number concentration and heat release rate. The count median diameter (CMD) varies with time and the change rate of CMD varies with particle concentration. In these experiments, the CMD is a constant in a few minutes after burning extinction.
Substation Locating and Sizing in Distribution Network Based on Geographic Information
Authors: Wang Zhen , Sheng Si Qing , Zhou Qing Jie
Published: September 2013

For substation locating and sizing in the distribution network, the cost of land and geographic information should be considered. A new algorithm based on cultural differential evolution algorithm (CDEA) considering geographic information factor is presented. Based on the improved technique for order preference by similarity to ideal solution (ITOPSIS), geographic information factor model is set up. CDEA is proposed by designing three kinds of knowledge in belief space to guide evolution. The new algorithm overcomes the premature phenomenon of differential evolution algorithm and improves significantly ability of global optimization. Finally the case proves that the proposed model and method is correct, having certain practical value.
The Effect of Bath Ph on the Phase Formation of Ternary Co-Ni-Fe Nano-Coatings
Authors: Resali Nor Azrina , Hyie Koay Mei , Abdullah Wan Normimi Roslini , Ghani M.A.A. , Kalam A.
Published: September 2013

This study describes how the control of bath pH allows different types of phase formation in the ternary Co-Ni-Fe nanocoating. The acidity of the plating bath has been known as a main factor to the properties of coatings. The Co-Ni-Fe coating was fabricated using a commercial electrodepostion process. Several pH solutions (3, 7 and 9) were employed to determine the optimum condition for Co-Ni-Fe synthesis. The bath pH was varied by using sodium hydroxide (NaOH) and sulphuric acid (H2SO4). Other parameters such as temperature, electrolyte composition, deposition time and current density were kept constant. The experiment was performed at 50°C. This temperature is commonly used in the industrial plating process. XRD analysis indicated the presence of both phases: body centred cubic (BCC) and face centred cubic (FCC) dependent on the pH value. Co-Ni-Fe nanocoatings obtained from the electrolyte of low pH showed the fine-grain morphology. The hardness of the Co-Ni-Fe nanocoatings was closely related to the obtained morphology.
Numerical Solution of Multidimensional Compressible Flow by High Order Nodal Discontinuous Galerkin Method
Authors: Ahmed Fareed , Ahmed Faheem , Yang Yong
Published: September 2013

In this paper we present a robust, high order method for numerical solution of multidimensional compressible inviscid flow equations. Our scheme is based on Nodal Discontinuous Galerkin Finite Element Method (NDG-FEM). This method utilizes the favorable features of Finite Volume Method (FVM) and Finite Element Method (FEM). In this method, space discretization is carried out by finite element discontinuous approximations. The resulting semi discrete differential equations were solved using explicit Runge-Kutta (ERK) method. In order to compute fluxes at element interfaces, we have used Roe Approximate scheme. In this article, we demonstrate the use of exponential filter to remove Gibbs oscillations near the shock waves. Numerical predictions for two dimensional compressible fluid flows are presented here. The solution was obtained with overall order of accuracy of 3. The numerical results obtained are compared with experimental and finite volume method results.
A Blind Digital Watermarking for PDF Document
Authors: Chen Qing , Hu Qi Wen , Feng Shao Kun , Fu Ze
Published: September 2013

In this paper, a text blind watermarking is proposed and implemented for copyright protection. Based on the characteristics of PDF format, this algorithm uses character spacing coding throughout whole PDF document to embed watermark into it. Robustness and security is further increased by using synchronous coding, cycle encryption and majority decision. Watermark embedding and extracting are implemented under the software environment of VC++ 6.0, and performances are tested and analyzed. Experiments show that the algorithm has good transparency, large capacity and good robustness. It can apply to both of Chinese and English PDF documents.
A Study on the New Portable Effervescent Atomized Water Mist Equipment
Authors: Liang Qiang , Li Yan Feng , Yao Guo Cai , Xing Xue Fei
Published: September 2013

A new effervescent atomized water mist fire extinguishing equipment was developed by combining the characters of water mist and effervescent atomization. A series of wood crib and gasoline pool fire suppression experiments were performed using the equipment. The fire extinguishment time, temperature and radiation heat flux of the flame were measured, and then the process of putting out different type fire was analyzed. A wood crib fire of 0.6A can be put out in 180 seconds using water mist produced by effervescent atomization equipment. Only 38 seconds was taken to suppress a gasoline fire.
Dynamic Response Analysis of NC Machine Tool's Bed on ANSYS
Authors: Qiu Hai Fei , Wu Song Lin
Published: September 2013

Finite element model of NC machine tools bed was set up in ANSYS, natural frequencies and modal shapes in low order were calculated by modal analysis of the bed. Then displacement-frequency curve and stress-frequency curve between 300 Hz and 700 Hz were acquired based on harmonic response analysis of the bed, and dynamic response of the bed which affected by harmonic load was clear; Transient dynamic analysis of the bed was finished by Full method, then displacement curve and acceleration curve about time domain were acquired, and influence of impact load during the process of starting NC machine tool which affect on the bed was understand, in results, some important references and basis were offered to optimal design of the beds dynamics.
On the Equilibrium Problem of a Soft Network Shell in the Presence of Several Point Loads
Authors: Badriev Ildar B. , Banderov Victor V. , Zadvornov O.A.
Published: September 2013

We consider a spatial equilibrium problem of a soft network shell in the presence of several external point loads concentrated at some pairwise distinct points. A generalized statement of the problem is formulated in the form of integral identity. Then we introduce an auxiliary problem with the right-hand side given by the delta function. For the auxiliary problem we are able to find the solution in an explicit form. Due to this, the generalized statement of the problem under consideration is reduced to finding the solution of the operator equation. We establish the properties of the operator of this equation (boundedness, continuity, monotonicity, and coercitivity), which makes it possible to apply known general results from the theory of monotone operatorsfor the proof of the existence theorem. It is proved that the set of solutions of the generalized problem is non-empty, convex, and closed.
Extended Parametric Modeling of Transition Tube with Constant Section Area along Arbitrary Central Routes on CATIA
Authors: Wang Lei , Wang Xiao Yu , Meng Xiang Bao
Published: September 2013

Extended parametric models of transition tube structures were implemented based on authors previous work [11] on constant cross section area assumption along arbitrary central routes like straight, circular and oblique curves on CATIA platform. It is aimed at that these structures can provide more flexible geometric configuration options and modifications to tube channel transitions for multi phase flow systems and pipeline junctions. Details of parameterized modeling process were exhibited on CATIA Generative Shape Design module with the help of Parameters and Relations functions. The tube surface models are all in circular cross sections and constrained in many ways along arbitrary coplanar or cylindrical sub-central routes three dimensionally for various layouts. Future work is emphasized on numerical simulation and experimental investigation with these geometric structures in multi phase flow systems and pipeline application.
ε-Uniform Convergence of the Hybrid Difference Scheme on the Shishkin Mesh for Singularly Perturbed Problems
Authors: Zheng Quan , Feng Xiao Li , Li Xue Zheng
Published: September 2013

In this paper, we discuss the hybrid difference scheme on the Shishkin mesh for the singularly perturbed problems in 2-D. The ε-uniform pointwise convergence is proved by the comparison principle and barrier functions. The experiments support the theoretical result.
A New Chaotic Dynamic System Research
Authors: Zhao Gui Qing , Wu Guo Zeng
Published: September 2013

A new four-dimensional chaotic system is presented in this paper. Some basic dynamical Properties of this chaotic system are investigated by means of Poincaré mapping, Lyapunov exponents and bifurcation diagram. It is a new phenomenon that the phase plane attractors can achieve opposite and topology of exactly by changing the parameter symbol of c.