bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Evaluation of a 2-DOF Planar Parallel Manipulator
Authors: Zhu Xiao Rong , Shen Hui Ping
Published: October 2011

In this paper, a 2-DOF planar parallel manipulator actuated horizontally by linear actuators is proposed. The inverse and forward kinematics can be described in closed form. The velocity equation, singularity of the manipulator and the conditioning index is investigated. In addition, the inverse dynamics problem of the device is investigated employing the Lagrange approach. The dynamic simulation is carried out. The results show that the kinematics performance and the force transmissibility are worse when the end-effecter moves near the singularity. The proposed manipulator can be applied to the field of machine tools or used as the mobile base for a spatial manipulator. The results of the paper are very useful for the design and application of the new manipulator.
Remote Sensing Based Analysis of the Mine Geological Environment Evaluation
Authors: Wu Xue Wei , Bao Guang Dao , Jia Wei Wei , Zhai Chang , Li Xing
Published: October 2011

Mine development can benefit mankind, but also cause ecological damage to the environment; bad influence threatens the lives and safety. Environmental pollution caused by mining is a complex; system changes, no single factor and the instantaneous direction indicators are not given the trend of the entire environmental system. Remote sensing data with regional and cyclical characteristics, using remote sensing technology to monitor the mine environment has a strong advantage, is one of the key people to study. By using time series remote sensing data, extraction mining environment-related indicators, and actual work to establish a complete index system and using AHP to determine weights, combined with comprehensive evaluation model of experimental area to study, and achieved good results.
Energy Saving and Payback Period for Retrofitting Air Conditioning Systems in Taiwan
Authors: Chang Chung Yi , Lin Hsien Te , Tzeng Chun Ta , Yang Kuan Hsiung , Chuah Yew Khoy , Ho Ming Chin
Published: October 2011

In Taiwan, AC systems in buildings with central air conditioning account for over 45% of the total electricity consumed. Inefficient and poorly designed AC systems in existing buildings waste considerable amounts of money and energy. Therefore, retrofitting AC systems has become a widely adopted strategy to save energy while maintaining a comfortable indoor thermal environment. This study analyzes the potential energy savings and payback period of retrofitting AC systems in public buildings. In addition to the required Building Energy Management System (BEMS), several measures are introduced to reduce energy consumption during retrofitting. The main measures include testing, adjusting, and balancing (TAB) of existing AC systems; replacing over-designed chillers with chillers with smaller capacity; installing frequency conversion in original systems, such that they become variable water volume (VWV) and variable air volume (VAV) systems; and utilizing CO2 concentration control and pre-cooling air systems. Based on analytical results, we conclude that AC system retrofitting can reduce total energy usage by 11.75%, while the average payback period for a retrofit project is 4.71 years, demonstrating that AC system retrofitting in Taiwan is economically sound.
Simulation Study on the Influence Factors of Generated Output of Proton Exchange Membrane Fuel Cell
Authors: Fan Li Ping
Published: October 2011

Proton exchange membrane fuel cells have been receiving more and more attention these recent years. It is expected to improve the output power of the fuel cell, so it is important to understand what are the relevant factors affecting the output power. Simulation can provide valuable insight and guidance for design, performance optimization, and cost reduction of fuel cells. Some factors which affect the generated output of proton exchange membrane fuel cell are study in this paper, and simulation results are shown and analyzed. It helps to understand the mechanism of the fuel cell and lay a good foundation for improving the output power.
Study on Circulation Application and Energy-Conservation Management Based on Exhibition Project
Authors: Wang Xi Yuan , Wu Xiang , Wang Ya Nan , Han Jian Chenn
Published: October 2011

Through the analysis of energy-consumption in the link of design–setup–buildup–withdrawal-transportation in exhibition process; exhibition’s circulation application has been discussed; the characteristics of energy-consumption in modern exhibition management, implementation and material application has been comparatively analyzed; then, suggestions are proposed to establish the influence model of material and ecological environment and the circulation application model of modularized building elements. The account method of energy consumption in exhibition application has proved the value of the application of circulative energy-conservation in exhibition project, providing the theoretical basis for sustainable development of exhibition business.
The Application of Phase-Inversion Symmetric Method in the Frequency, Time and Space Domain
Authors: Xiao Ying Zhe , Ma Fu Chang , Xiao Bao Jin , Han Xiao Feng
Published: October 2011

Because the correlation coefficient of noise between the adjacent channels is greater than 0.The Phase-Inversion Symmetric Method (PISM) can be used to eliminate noise and get larger SNR. The adjacent channels include adjacent frequency band, adjacent time buttress and adjacent space. This paper introduces the use of PISM in the frequency, time and space domain.
Technology Research on Relief Annealing of 65Mn Metal Rubber
Authors: Luo Kun , Zhao Cheng , Li Xiang
Published: October 2011

The paper had researched relief annealing of 65Mn Metal Rubber. Test results had shown that relief annealing significantly changed static and dynamic loss factors of 65Mn Metal Rubber. The influence of annealing temperature, annealing time, Metal Rubber density and cooling to static and dynamic loss factors was obviously different. The optimal relief annealing parameters of 65Mn Metal Rubber were annealing temperature 270°C, annealing time 25 minutes, Metal Rubber density 1.46g/cm3, and oil cooling.
The Impact of Seawater Corrosion on Friction Torque of Bearing Deputy Campaign
Authors: Zhao Cheng , Luo Kun , Gao Chang Yin
Published: October 2011

According to the stress state and corrosion resistance of bearing deputy campaigns,NO.5 bearing deputy campaign was selected as research subject.The work including design, processing, finite element load calculation, friction torque before and after corrosion of bearing deputy campaign samples were carried out according to similarity theory. Friction torque calculations of bearing deputy campaign before and after corrosion were 2.9×106N•mm and 3.2×106N•mm respectively. Compared with the friction torque before corrosion,the friction torque of bearing deputy campaign was increased by 10.4% because of seawater corrosion.
The Research and Design of Distributed Automated Test Framework which is Oriented to Embedded Devices
Authors: Hu Wei Hua , Yang Han Yun
Published: October 2011

With the development of embedded technology, research for embedded software test techniques and tools is a hot topic in the field of IT. To resolve the the two problems of scarcity of embedded devices and interacting directly with the device, we have designed a distributed automated test framework for embedded communication devices, It has a unique distributed engine to handle a variety of distributed test cases.To compare with the most popular automated test framework QTP (quicktest Professional),we find that our framework has the advantages of directly interact with the embedded devices, higher efficiency and higher accuracy.
The Research of Starting Engine In-Motion for HEV
Authors: Hu Ming Hui , Xu Shao Zhi , Qin Da Tong , Li Guo Yun
Published: October 2011

Based on the vehicle dynamic equation in starting engine in-motion process for HEV, theoretical derivation is conducted to obtain the impact hardness equation in the process. By using matlab/simulink, the law of influence the parameters have on the impact hardness equation is analyzed. Then, coordinated control stategy between the clutch pressure and motor torque, and between motor torque and engine torque is proposed based on the influence law. At last a test bed of the starting engine in-motion for HEV is implemented. The test results show that the change rate of clutch pressure, motor torque and engine torque, can effectively coordinate the change relation between the clutch pressure, the motor torque, and the engine torque. And the test results satisfy the requirements of ride comfort in starting engine in-motion process for HEV well.
Recommendation Research in E-Learning
Authors: Wu Bing , Xu Wen Xia , Ge Jun
Published: October 2011

This study is a productivity review on the literature gleaned from web of science databases concerning recommendation in E-Learning research. The result indicates that the number of literature productions on this topic is growing in recently 4 years, approximately the same number in 2008, 2009 and 2011. The main research development country is Taiwan, and from the analysis of the distribution of language, English is the most popular language. Moreover the research focuses on are mainly context model and system design to explore fundamental components of E-Learning context and offer a learning environment suitable for users, also the limitations and future research of these research were discussed, so that the direction for future research work can be explored.
2D Simulation of the Aerodynamic Micro Air Journal Bearing for Micro Gas Turbine Engine
Authors: Zeng Zhao Qi , Wang Yu Kui , Wang Zhen Long
Published: October 2011

A micro air journal bearing for micro gas turbine engine is designed in this paper. 2D simulation of the aerodynamic micro air bearing is conducted to investigate the effect of the main parameters of the air bearing on the load capacity, including the clearance between the air bearing and shaft, the gear number and height of the air journal bearing, the rotational speed of rotor. The optimum value of the important parameters are explored and presented. The time correlation method is used to solve the RANS (Reynolds Averaged Navier-Stokes) equations. Requirements both from load capacity and motion stability is considered and compromised for a better and stable performance of the air journal bearing. The shaft is stably rotated in a relatively low speed of 1.18×105rpm, which is much lower than other researches and can be achieved easily.
A Seam Measurement Method Based on Micro Depth of Field for Laser Welding
Authors: Wang Ping Jiang , Huang Ya Ting , Peng Fang Yu , Qi Jiang Fei , Li Bin
Published: October 2011

For the seam feature measurement of the tight butt joint without misalignment in laser welding, current vision sensor cannot obtain the seam gap width and seam position stably and reliably. In this paper, a seam measurement method based on the micro depth of field is proposed. A four times optical magnification lens, a CCD/CMOS camera and an external LED lighting unit are used to constitute the measure system, which can be used for the tight butt joint for laser welding. Experiment indicated that it can obtain the seam gap width and seam position stably and correctly. With the method, seam surface normal vector also can be measured. The measurement accuracy for the seam gap width and seam position is 5 µm and 6 µm, respectively. Furthermore, the narrowest welding seam gap that can be measured by this method is 0.02 mm, which is fully satisfied the demand of the seam measurement in laser welding.
Analysis and Design of MIS on Graduates Feedback
Authors: Yang Xuan Hui , Wu Yun
Published: October 2011

Graduates feedback system (GFS) is a graduates-based communication platform that integrates enterprises, universities and graduates. This MIS aims to enhance graduates resource use, improve school education quality and university employment problems. This article was clued with the general development process of MIS. It illustrated the main points and some developing tips in the entire course, named requirement analysis, system design, system development and system implement. Under the aid of a large number of documents collected, and the actual survey, it came up with the advantage and application value of the system compared to the domestic and foreign alumni networks. It is believed that the idea of this MIS will provide a precious reference to education for colleges and universities.
Anti-Seismic Behavior on Damaged RC Frame Strengthened with CFRP Sheet and Steel Plate
Authors: Liang Yu Guo , Deng Yu , Fu Shi Feng
Published: October 2011

To study the bearing capacity, ductile, energy dissipation capacity and failure mechanisms of RC frames which Strengthened with CFRP sheet and steel plate, three concrete frame specimens were subjected to the horizontal low cyclic loading. One was loaded up to the failure load, the others were strengthened with CFRP sheet and steel plate after loading to damage, and then were loaded up to the failure load. In terms of cracking load, yield load and ultimate load, the experimental results show that the improved degree of frame strengthened with steel plate is more than with CFRP sheet, on the other hand, regarding ductile and energy dissipation capacity, the improvement of frame strengthened with CFRP sheet is better than with steel plate.
Application of CAD/CAM Technology on the Modeling of Freeform Surface Parts
Authors: Xiong Juan , Han Li Na
Published: October 2011

To improve the design of complex curved parts and the shortage of reading two-dimensional drawings. This paper explicitly discussed modeling the bottom of a bottle by enhanced modeling and rendering techniques of CAD/CAM. Established the bottom with freeform surfaces in UG to solve the problem of design a part with freeform surfaces, and rendered the bottom of the bottle to express the result of three-dimensional stereoscopic of a part with freeform surfaces. Rendering is setting the material and texture for the model, and then adding lights and setting the background, etc to help solving the problem of identifying a part with freeform surfaces. Finally, we got the features of UG, the advancement, applicability of CAD/CAM and the necessity of expanding it.
Contact Pressure Research of Drill Pipe and Packer of Rotating Blowout Preventer
Authors: Li Bin , Zhang Si Mao
Published: October 2011

The contact pressure of packer of rotary blowout preventer (BOP) act on drill pipe is closely related to the life and performance of rubber core. According to the actual working condition of the drill pipe and connector passing through the packer in the process of drilling, this paper establishes a three-dimensional mechanics model for sealed drill pipe of packer with ABAQUS finite element software , it simulates the characteristics of contact pressure changing while the drill pipe and drill pipe joints went through the hole of the packer, and obtained the location and the distribution rule of the maximum contact pressure of drill pipe packer at a certain wellhead pressure, and also studied the different packer materials and movement characteristics of drill pipe, and mastered the influence disciplinarian of the friction coefficient between the packer and drill pipe that act for the packer’s contact pressure.
Design and Application Analysis of Hybrid Coupling System Based on CVT
Authors: Yang Yang , Zhao Xin Fu , Qin Da Tong , Gong Hui
Published: October 2011

To improve the power performance and fuel economy of hybrid electric vehicle, a design idea of hybrid coupling system that combines power coupling function of planetary differential and continuous ratio regulating characteristics of continuously variable transmission is proposed. Four designs of the coupling system that compact and operating mode is complete relatively are identified through using the method of lever analogy. The paper analyzes varieties of operating modes and power transfer lines of new type of coupling system in different vehicle conditions, such as normal travel, astern driving, vehicle start, engine start, parking generation, decelerate/brake, etc. Application and superiority of the four schemes of the coupling system applied to HEV are analyzed at last.
Design Parameters for Spatial Helix Gearing Mechanism
Authors: Chen Yang Zhi , Chen Zhen , Fu Xiao Yan
Published: October 2011

The formulas of design parameters for spatial helix gearing mechanism are deduced based on the equation of spatial curve meshing, including teeth number, helix angle and screw pitch of driving tines, diameter of tines, corrected length of tines, height of teeth etc.. That could supply theoretical basis for industrial application of the spatial helix gearing mechanism
Error Model and Calibration Analysis of the Flexible Coordinate Measuring Machine
Authors: Li Fang , Liu Shu Gui , Zhao Lei
Published: October 2011

A new 5-DOF flexible coordinate measuring machine (CMM) is introduced in this paper, which uses REVO system produced by Renishaw. According to the D-H method, the mathematical model is built, and then the error model of the flexible CMM is derived. The parameter calibration based on the nonlinear least square method is analyzed theoretically. Due to the disadvantages of Gauss-Newton method, LM method is researched, which improved the singularity of the coefficient matrix. The calibration analysis is a basis for improving accuracy of the flexible CMM.
Heat Source Model of Lap Laser Welding of Stainless Steel Vehicle
Authors: Wang Hong Xiao , Wang Chun Sheng , Shi Chun Yuan , Huang Zhi Yi
Published: October 2011

Resistance spot welding (RSW) is being taken place by partial lap laser welding for the poor surface quality and bad airtight due to the pressure of electrodes. The shape of partial lap laser welding is similar to the vase. When the penetration of the joint is in a certain range, there is no welding trace on the outer surface. Laser welding temperature field numerical analysis based on Abaqus finite element analysis software is committed to obtain a suitable range of process parameters to improve production efficiency and automation by determining the joint penetration. To master the laser lap welding of stainless steel weld penetration state, the combination of three-dimensional positive cone + three-dimensional inverted cone + half-ellipsoid heat source model was established simulating stainless steel lap laser weld pool shape and forecasting the range of process parameters .
Low Analysis of Steady Flow Field in Mechanical Seal Based on ANSYS
Authors: Zhu Yue Feng , Chen De Lin
Published: October 2011

Simulation and analysis of steady and 2D flow field by using ANSYS8.0 and getting the press and velocity contour. omulate the leakage. then through comparison and analysis offering theory evidence for controlling leakage effectively.
Operation Parameter Recorder for Construction Machinery Based on Embedded Technology
Authors: Feng Ke , Meng Xiao Ming , Li Huan Liang , Wang Xiao Long
Published: October 2011

Conventional operation parameter monitoring device for construction machineries can only achieve sound (or light) alarm and control over over-limit status for operation parameters of construction machinery and it can not save any historical data, thus hinders accurate analysis, diagnosis and maintenance of the construction machinery. The operation parameter recorder for construction machinery developed based on industrial control computer and embedded technology can detect, record and manage the operation parameters. The real time fault alarm and historical data analysis can also be realized. The industrial computer, which is core module of this operation parameter recorder, controls the operation parameter acquisition module based on micro-controller ARMSTM32F103 to acquire and condition each operation parameter of the construction machinery. Application software running on the industrial computer processes the operation parameters and carries out alarm and control operations under abnormal conditions for fault protection. The abnormal data shall then be stored for later fault analysis. This operation parameter recorder can record many different types of operation data and has a large storage capacity, so it is applicable to many different types of construction machinery.
Optimization Design on Ribbed Slab for Crossbeam of Heavy NC Gantry Moving Boring & Milling Machine
Authors: Han Gui Hua , Gao Bing Wei , Wang Yun Fei , Sun Gui Tao , Wu Di , Shao Jun Peng
Published: October 2011

In order to improve the dynamic characteristics of crossbeam of heavy NC gantry moving boring & milling machine, the ribbed slab structure of beam were analyzed and optimized with the finite element analysis software, and the comprehensive optimization method of the number, size and layout of ribbed slab were putted forward based on the classification of ribbed slab structure. According to the result of the finite element analysis, the internal type and horizontal spacing of ribbed slab are optimized to get the best number, spacing, thickness and height of ribbed slab; Under the required intensity, stiffness and stability conditions materials are distributed reasonably to reduce beam weight which make little deformation and the uniform stress distribution. The comprehensive optimization method study has reference value for ribbed slab structure design.
Pressure Coordinated Control System of Regenerative Braking Based on Hardware of ABS for HEV
Authors: Yang Yang , Yang Yang , Qin Da Tong , Li Jin
Published: October 2011

A new kind of pressure coordinated control system suite of regenerative braking system for hybrid electric vehicles (HEV) is proposed in this paper on the basis of appropriate transformation on traditional hydraulic braking system with ABS. AMEsim modular simulation platform is used to build a simulation model of the system. Dynamic performances of the key components and system are simulated and analyzed. And the simulation results show the effectiveness and feasibility of the pressure coordinated control system, which lays the foundation of the design and optimization for the regenerative braking system.
Research on Divinable Characters of Rock Burst and Movement of Strata and Ground
Authors: Guo Wei Jia , An Bo Yi
Published: October 2011

Large-scale separation terrane in bending strip upside cranny strip is brought by un-consistency of overlying strata subsidence movement due to underground mining. Different characters of movement and deformation of overlying strata and ground include periodic caving of separation terrane interspace along with work face mining. Conglomerate rock layer movement is the main power fountain of rock burst on the basis of locale observation. And rock burst moves periodically adapt to movement of deep conglomerate rock layer which had similar characters with main roof. Practice indicates this method that forecasting and prediction using correlation information of movement of strata and ground is feasible and has reference meaning for similar stope.
Research and Application of NURBS Surface Modeling Technique in Computer Aided Industrial Design
Authors: Zhao Bo , Ai Ping
Published: October 2011

NURBS surface modeling technique is an important part of computer aided industrial design(CAID), and surface modeling has much advantage. This thesis bases on the statistics and comparison of current CAID practical application methods and techniques, concludes the common CAID techniques, the thinking methods and application process of surface categorization in surface modeling from the basic theory of NURBS surface modeling; and together with concrete cases, this thesis also proposes an solution for the common hard problems in the process of using NURBS technique to build 3D product models.
Study on 42CrNiMo Gear Contact Fatigue Strength Experiment
Authors: Wang Tie , Zhang Rui Liang , Wu Zhi Fei , Li Hong Mei
Published: October 2011

This paper makes study on the 42CrNiMo gear contact fatigue strength, applying the rapid measure method of the gear contact fatigue stress value with a few gear samples to get the estimated value of the gear fatigue limit value precisely and rapidly. And the gear fatigue life curve and fatigue damage accumulation curve are got by MATLAB simulation. Comparing with the traditional test method, this method can reduce the cost and save the time.
Study on Ware Resistance of Laser Hardening Rolling Mill Liner
Authors: Qiu Xing Wu , Zhang Yun Peng , Liu Chun Ge
Published: October 2011

In order to change the traditional status that rolling mill liner can not be manufactured with a single material, laser transformation hardening was carried out by HL-1500 cross-flow CO2 laser processing machine on 45 steel surface. developed a non-composite liner instead of the original. The microstructure and properties were researched by means of scanning electron microscopy, X-ray diffractometer, microhardness tester and abrasive wear testing machine. The result indicate that, the microstructure of laser transformation hardening layer fine and homogeneous, mainly composed of Fe, Fe3C, Fe-Cr and Cr3C2, the hardness and the relative wear resistance are about 3 times and 2.7 times as that of the substrate respectively; which can reached the technical requirements liner needed.
Study on Wear Performance of Whisker-Toughening Ceramic Cutting Tools Synthesized by the Carbothermal Reduction Process
Authors: Chong Xue Wen , Huang Chuan Zhen , Xu Liang , Zhao Guo Long , Zou Bin , Liu Han Lian
Published: October 2011

The cutting performance and wear mechanisms of whisker-toughening ceramic cutting tools synthesized by carbothermal reduction process have been studied when cutting the hardened alloy steel 40Cr. It is indicated that the wear resistance of ceramic tools is affected by the molar ratio of C and N in tool materials. At low cutting speed, the main tool wear mechanisms are abrasive wear and oxidation wear. At middle and high cutting speed, the tool wear mechanisms are controlled by abrasive wear, adhesive wear, diffusion wear and oxidation wear simultaneously. Adding whiskers to the matrix material is one of the effective means to improve the wear resistance of ceramic cutting tools.
The Experimental Research of the Influence of Accumulator before Servo Valve to Mill Control Precision
Authors: Chen Chun Ming , Wang Yi Qun , Yang Yang
Published: October 2011

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. Based on the experiment, the relationship between initial charging pressure & volume of the accumulator at inlet of the servo valve and control precision is analyzed in detail, and coupling rules between the load variation and the pressure fluctuations of oil-source are obtained, the rules can give reference for selecting initial charging pressure & volume of the accumulator according to the requirement of system control precision, which can further improve control precision and product quality by optimizing equipment parameters.
The Friction and Wear Behavior of a Spherical Plain Bearing with the Copper Grid Composite Liner under Swivel and Tilt Swinging Conditions
Authors: Qiu Ming , Wang Guo Feng , Bai Yao Xing , Chen Long , Li Ying Chun
Published: October 2011

Experiments were carried out to investigate the tribological properties of spherical plain bearings with copper grid composite liners filled PTFE under two contact pressures(40MPa,60MPa), four oscillating frequencies (1.2Hz, 1.8Hz, 2.4Hz, 3.0Hz) and two swinging conditions. With the help of SEM, EDS and Three-dimensional morphology profiler, the wear mechanism was analyzed. The results indicate the coefficients and wear depths under tilt swinging condition are higher than those of swivel swinging. While the friction temperature show the contrary trend. The research discovers that the friction temperature has a great influence on tribological properties of spherical plain bearings. The analysis demonstrates that the main wear mechanisms are the adhesive and abrasive wear under the two swinging conditions and extrusive wear exist also.
The Influence of Metal Layer on the Differential Transformer Displacement Sensor
Authors: Jin Chao Wu , Xu Long Xiang , Fan Qiu Ping , Zhu Yi Li
Published: October 2011

For some special active magnetic bearings (AMBs) application occasions that demand the rotor isolated from external environment, especially when a metal layer is added, other sensors besides differential transformer displacement sensor (DTDS) can not used to detect the rotor displacements. Before being used, the impact factors and relevant extents on the DTDS performances are analyzed on the basis of magnetic and electrical properties the added metal layer between the DTDS core and the measured object. The DTDS performance with and without metal layers are separately simulated on the platform of MATLAB and ANSOFT. And then the DTDS with metal layers are applied to a five-DOF AMB test bed. The research results show that the sensor sensitivity has decreased 8.18% and cutoff frequency decreased 5%, while the linearity increased 38.7%. Despite of those changes, the rotor can also be stably suspended and rotated at 30 000r/min in the five-DOF AMB system.
Stability and Online Monitoring of Cutting Chatter: A Review
Authors: Zhang Yong Liang , Li Zhi Yuan
Published: October 2011

Cutting chatter is a kind of severe vibration generating from the interaction of machine tool system and cutting process and it will seriously affect the performance of machine tool and the quality of work piece. With the rapid development towards high precision and automation of the modern manufacturing industry, the stability and monitoring of cutting process have become the hot issues in production and engineering field, lots of useful researches and explorations have been done worldwide. The research situations of stability limit prediction of machine tool cutting system and technology of chatter online monitoring are discussed, the problems and the developing trends are summarized.
An Error Correction Code for Use in Space Vehicle Computers
Authors: Huang R.N. , Gong B. , Lou Yun Jiang
Published: October 2011

Memory cells of space vehicle computers generate errors in their stored data because of radiation. The main reason of the error is single event upset (SEU). Hamming code which has Capability of correcting one bit and detecting two bits is usually used in space vehicles to secure the memory data. As the density of the memory is more and more high, the possibility of multiple bits upset (MBU) increase and hamming code may be inadequate. In this paper, a (15,8) code is presented which can correct all double-adjacent errors and triple-adjacent errors in addition to signal error correction (SEC) and double error detection (DED). It is a powerful and efficient solution to SEU and MBU.
An Image Retrieval Method Based on Local Features of Interest Points
Authors: Fu Xiang , Wang Jun Ting , Zeng Jie Xian
Published: October 2011

To measure the similarity between two images, the local information around all the points were usually used for traditional image retrieval methods based on interest points. The accuracy would be influenced by the dissimilar interest points in the background region or in the uninterested regions. A new image retrieval method based on interest points was proposed in this paper. The most similar interest points were chosen firstly based on feature matching techniques, then the similarity was measured based on the local gray information around the preserved similar interest points. Experiments show that the proposed method is more accurate than traditional image retrieval method based on interest points.
Bilingual Teaching in University Should Act as a Final Ring in the Foreign Language Education Chain in China
Authors: Peng Wei , Xiao Fan , Zhang Lu Fang , Zhan Yan
Published: October 2011

China's English education has acted as a huge and persistent system. But still it can not solve the problem that graduates can not use English well in their professions. In this paper, based on the project of bilingual teaching reform of "Advanced Manufacturing Technology", it is presented that the bilingual teaching for senior in university should act as a final ring in the foreign language education chain in China. In this final ring, both the teaching philosophy that English is only a kind of tool and the teaching strategy of using English are two crucial factors. The teaching result shows that the bilingual teaching played a multiplier effect in achieving the ultimate goal of English education.
CAD of Friction Material for Automobile Brake Using Artificial Neural Networks
Authors: Lin You Xi , Gao Cheng Hui , Chen Zhi Hua
Published: October 2011

The brake friction materials in an automotive brake system are considered as one of the key components for overall braking performance of a vehicle. Temperature sensitivity of friction materials has always been a critical aspect while ensuring their smooth and reliable functioning, and that sensitivity need to be constantly optimized. The performance of friction materials at elevated temperatures is defined by their fading performance.In this paper,a group of non-asbestos organic based friction materials containing different relative amounts of the ingredients of aluminosilicate fiber, steel fiber, phenolic resin and Cu powder mostly effecting on the tribological properties of designed brake material were manufactured by compression molding. Dry sliding friction characteristics of composites were tested on a model JF150D-II pad-on-disk type friction tester. A model of feed-forward artificial neural networks (ANN) consisting of four input neurons, six output neurons and one hidden layer, was used for the analysis and prediction of the correlation between material components and friction performance. The input parameters of ANN were the contents of four main components as aluminosilicate fiber, steel fiber, phenolic resin and Cu powder. The outputs were the friction coefficients of brake material against cast iron at six different operating tempetures from 100°C to 350°C. Based on ANN model trained successfully by 25 pieces samples, genetic algorithm(GA) was used to optimize the input parameters of compositions of brake material with the goal of minimizing fluctuation of friction coefficients at 100°C to 350°C. The optimum composition of brake material was obtained. The friction experiments of optimized material showed excellent stability of friction coefficients for automotive brake material as test temperatures increased from 100°C to 350°C. The neural network has impressive potential for solving time-consuming problems for the design of automobile brake material.
Experimental Investigation on Cavitation Noise of Water Jet and its Chaotic Behaviour
Authors: Zhang Feng Hua , Liu Hai Feng , Xu Jun Chao , Tang Chuan Lin
Published: October 2011

The cavitation noise signals were collected separately for the cavitation nozzle and general nozzle at the target position and the nozzle exit in the condition of different standoff distance. The features of signal’s frequency spectrum and power spectrum were analyzed for different nozzles. Based on chaotic theory, phase space reconstruction was processed and the maximum Lyapunov exponent was calculated separately for each cavitation signal’s time series. Under the condition of this experiment, the difference between the general nozzle and cavitation nozzle was mostly marked at the target position while the standoff distance is 35 mm, which mainly displayed at the high frequency segment. The maximum Lyapunov exponent calculated appeared at standoff distance 35 mm. At the nozzle exit, the noise signal of cavitation nozzle is different from the general nozzle. The difference also displayed at the high frequency segment, and no changing with the standoff distance
Effects of Temperature and Humidity on the Optical Property of Aluminum Film
Authors: Her Shiuh Chuan , Wang Yi Hsiang
Published: October 2011

Aluminum films with high reflectivity and low absorption in the visible wavelength region have been widely used in optical applications. In this investigation, aluminum films were deposited on the glass substrate at various temperatures by electron-beam vapor deposition. The reflectivity of the Al thin film was measured by a Perkin-Elmer Lambda spectrophotometer in the wavelength region of 450-680 nm. The effects of the temperature and humidity on the reflectivity of the Al film were examined. Experimental results show that the reflectivity of Al films is increasing with the increase of substrate temperature.
Interaction and Mediation Patterns for Service Composition
Authors: Cai Guang Jun , Zhao Bin
Published: October 2011

Service composition is an emerging way to provide the value-added service. For most existing composition results are rather unstructured and flat, it is very difficult to reuse them. In this paper, we propose two kinds patterns to construct the hierarchy of the composition. This method can not only improve the abstract level of the composition results, but also can promote their reusability. The experiment results and analysis show it is effective.
Key Technologies of Network Collaborative Modeling Based on B/S Structure
Authors: Wan Neng , Yang Yang
Published: October 2011

To achieve lightweight network collaborative modeling on the client, this paper designs the collaborative modeling architecture based on B/S structure. Considering the product CAD model information can’t be shared on the network, the XML technology is applied to build the middle model expression format which converts the CAD model to the middle model that can be shared among collaborative clients on the network. To solve the problem that the middle model is too huge to transmit on the limited internet bandwidth, the face representation method based on loops is proposed. With this method, the size of the middle model shared on the network can be reduced greatly. The structure of bidirectional inquiring between the feature information and the geometric element information is established in geometric models, and the problem that how to get modified features, topology relationship and geometric elements after design models have been changed is solved.
The Correlation Analysis of Discrete Variables and Continuous Variables Based on Mutual Information
Authors: Huo Lin , Lv Chuan , Fei Si Miao , Zhou Dong
Published: October 2011

As most Mutual Information method is limited to the correlation analysis between discrete variables in majority and tendency of choosing the characteristic variables with multi-values so far, in this paper we propose a new approach based on Mutual Information to measure the correlation of discrete variables and continuous variables. Then we take the fire control system of aircraft for example to calculate the correlation between fault types and monitor data indexes, and finally find the fault symptom classes.
The TP Chromatic Aberration Estimation by Using Neural Networks
Authors: Huang Du Jou , Chen Yu Ju , Huang Huang Chu , Lin Yu An , Hwang Rey Chue
Published: October 2011

The chromatic aberration estimations of touch panel (TP) film by using neural networks are presented in this paper. The neural networks with error back-propagation (BP) learning algorithm were used to catch the complex relationship between the chromatic aberration, i.e., L.A.B. values, and the relative parameters of TP decoration film. An artificial intelligent (AI) estimator based on neural model for the estimation of physical property of TP film is expected to be developed. From the simulation results shown, the estimations of chromatic aberration of TP film are very accurate. In other words, such an AI estimator is quite promising and potential in commercial using.
Application of Intrusion Prevention in Campus Network Security
Authors: Zhao Wei Guo , Pan Gang Zhu
Published: October 2011

The safety menace of campus network is demonstrated and its network security is estimated in this paper, then combined with the development trend of future network, the necessity of deep inspection and intrusion prevention in campus network is analysized. Finally it puts forward and discusses thoroughly several representative strategies of disposing deep inspection and intrusion preventing in campus network.
Study on Mechanics Model and Stress Evolution Law of Filling Stope
Authors: Liu Jin Xiao , Guo Wei Jia , Sun Wen Bin , Zhang Xin Guo
Published: October 2011

The paper sets up mechanical model according to the characteristics of paste filling stope and determines the basic model units which are overlying strata, filling body, support and floor. The paper also establishes the mechanical parameters for controlling movement and deformation of overlying strata and sets up the relationship of all mechanical parameters. Based on this, the paper studies the stress evolution law under the condition of different filling ratio and filling step distance with the method of numerical simulation.
A New Intelligent Approach Based on Genetic Algorithm for Finding Optimal Base Stations Configuration in the Dynamic Scenario Used in SON
Authors: Chen Qian Bin , Wang Yang , Liu Zhan Jun , Liang Cheng Chao
Published: October 2011

The problem of automatic selection and configuration of base station sites in the dynamic scenario is investigated. We propose a intelligent approach based on Genetic Algorithm used to adjust the level of the antenna power and select the base stations’ site from the candidate sites. According to the users’ density the base stations adjust their antenna radiated power automatically. Results are given that most of base stations are powered off when the density becomes very low, and show that it will save lots of energy resources. Since this algorithm can adjust the status of base stations intelligently and automatically, it can be used in SON.
A New Method to Recognize Unfertilized Egg in Early Incubation Stage
Authors: Zhang Hong Jun , Xu Li Jia , Zhao Wen Long , Liu Ming Dan , Zhou Wen Jun , Yang Chao
Published: October 2011

In order to achieve higher recognition rate of unfertilized eggs, the paper proposes a new method based on the area feature of egg's vertical image and the classifier BP network. The eggs hatched 2-5 days are selected as the experiment objects in our study. Four kinds of feature, including the gray feature and the area feature extracted from the egg's vertical image and the egg's horizontal image, respectively, are sent to BP network to accomplish the recognition of unfertilized eggs. The experiment results indicate that the area feature of egg's vertical image contains more category information, and this kind of feature classified by BP network can reach 97.86% of recognition rate. Moreover, it is almost free from some external factors, such as light, camera, eggshell and the parameters of BP network. While the other features sent to BP network, the recognition rate can be reached to only 86.43%. This study provides an effective and useful method to recognize unfertilized egg in early incubation stage.
Aligning Genomic Sequence Applied in Stereo Matching
Authors: Yu Shu Chun , Yu Xiao Yang , Fan Jian Ying , Wu Hai Bin
Published: October 2011

The stereo matching algorithm based on aligning genomic sequence is proposed in the paper. This method is divided in three steps: do genomic sequence on the same name epipolar of stereo matching, get branch matrix by establishing genomic sequences using the same name epipolar after being genomic sequences, control points technology and dynamic backdate method to get disparity. The experimental results show that stereo matching method based on genomic sequences has fast speed and good matching quality.
Gearbox Fault Diagnosis Based on AIS-ICA Algorithm
Authors: Huang Jin Ying , Pan Hong Xia , Lu Ya Hui , Li Yue
Published: October 2011

Immune theory is applied to independent component analysis in this paper. By elaborated on blind source separation procedure, the blind source separation based on immune optimization algorithm is put forward, that is AIS-ICA algorithm. The paper carried out simulation experiments of mixing and separation for four specific signals. The experimental results show that the convergence speed and separation precision is high, and it has good stability. The new algorithm is used to gearbox vibration signals for blind source separation and fault diagnosis, fault information carried by vibration signals enhanced. Results show that the algorithm used to separate vibration signals of gearbox can greatly enhance fault information, reducing difficulty of gearbox fault diagnosis.
Novel Method of MRI Medical Image Segmentation Combining Watershed Algorithm and WKFCM Algorithm
Authors: Liu Jin Qing , Chen Kun
Published: October 2011

Aimed at the disadvantage of over-segmentation that traditional watershed algorithm segmented MRI images, a new method of MRI image segmentation was presented. First, through traditional watershed segmentation algorithm, the image was segmented into different areas, and then based on the improved kernel-clustering algorithm, we used Mercer-kernel to map average gray value of each area to high-dimensional feature space, making originally not displayed features manifested. In this way, we can achieve a more accurate clustering, and solve over-segmentation problem of watershed algorithm segmenting MRI images efficiently, thereby get better segmentation result. Experimental results show that the method of this paper can segment brain MRI images satisfactorily, and obtain clearer segmentation images.
Pectoral Muscle Segmentation for Digital Mammograms Based on Otsu Thresholding
Authors: Liu Chen Chung , Yu Shyr Shen , Tsai Chung Yen , Tsui Ta Shan
Published: October 2011

The appearance of pectoral muscle in medio-lateral oblique (MLO) views of mammograms can increase the false positive in computer aided detection (CAD) of breast cancer detection. Pectoral muscle has to be identified and segmented from the breast region in a mammogram before further analysis. The main goal of this paper is to propose an accurate and efficient algorithm of pectoral muscle extraction on MLO mammograms. The proposed algorithm bases on the positional characteristic of pectoral muscle in a breast region to combine the iterative Otsu thresholding scheme and the mathematic morphological processing to find the rough border of the pectoral muscle. The multiple regression analysis is then employed on the rough border to obtain the accurate segmentation of the pectoral muscle. The presented algorithm is tested on the digital mammograms from the Mammogram Image Analysis Society (MIAS) database. The experimental results show that the pectoral muscle extracted by the presented algorithm approximately follows that extracted by an expert radiologist.
Regional Traffic Control System Study Based on Pattern Identification
Authors: Xia Bai Zhan , He Huai Wen
Published: October 2011

The thesis introduces traffic patterns definition and identification. Combined with actual project it has established the regional traffic signal coordination and control system based on particle swarm K-means clustering algorithm pattern identification. It puts forward system structure and working principles with discussions focused on several key problems existing in traffic pattern identification process.
Research on Merging Cluster Algorithm for QoS-Oriented Supply and Demand
Authors: Feng Xiu Zhen , Wu Gao Feng
Published: October 2011

Discovering service-on-demand for large numbers of functionality-similar web services is one of the key issues in service discovery study. To find out the proper service among the functionality-similar web services, a merging cluster algorithm regarding QoS-oriented supply and demand is proposed in this paper. To meet the target, FCM clustering is adopted for agglomerative clustering between the user’s QoS requirement information and the QoS information from Web Service resources. Then, the sequence could be determined by similarity computation with the same clustering. Lastly, the numerical example is presented to illustrate that the service-on-demand can be discovered efficiently and effectively.