bluuebunny/crossref_metadata_2025 huggingface dataset:
Fuzzy Multiple-Periods Time-Series Model Based on GSP and AR for Forecasting Gold Price
Authors: Liu Jing Wei , Cheng Ching Hsue , Su Chung Ho , Tsai Ming Chien
Published: February 2011

In the recent years, traditional time series model has been widely researched. The previous time series methods can predict future problems based on historical data, but have a problem that determines subjectively the length of intervals. Song and Chissom[6-7]proposed the fuzzy time series to solve the problem of traditional time series methods. So far, many researchers have proposed different fuzzy time series models to deal with uncertain and vague data. Besides, the consideration of a forecasting stage only discusses the relations for previous period and next period. In addition, a shortcoming of previous time series models didn’t consider appropriately the weights of fuzzy relations. This study builds fuzzy rule based on association rules and compute the cardinality of each fuzzy relation. Then, calculating the weights of fuzzy relations solve above problems. Moreover, the proposed method is able to build the multiple periods fuzzy rules based on concept of large itemsets of Apriori. To verify the proposed model, the gold price datasets is employed as experimental datasets. This study compares the forecasting accuracy of proposed model with other methods, and the comparison results show that the proposed method has better performance than other methods.
The Numerical Simulation of Microstress for Hypereutectic Al-Si Alloys
Authors: Wang Ai Qin , Xie Jing Pei , Wang Wen Yan , Li Ji Wen
Published: February 2011

The elastic-plastic finite element mechanical model of hypereutectic Al-Si alloy was established based on ANSYS software. When the Si particles were circle, trapezium, rectangle or triangle, the microstress of Al-Si alloy under the external load were simulated. When the size of Si particles changed from 25μm to 45μm, the stress of Si particles and matrix interface was calculated. The effects of morphology and size of Si particles and loads on micro-mechanics characteristic of alloy were analyzed. The results showed that: under the same load, triangle or wedge angle Si particles make the biggest stress in the matrix, trapezoidal particles make the second and the spherical particles make the smallest. With the increase of the load, the stress and the stress concentration of Si particles in the matrix was increased, the stress of wedge angle particle increases remarkably, but the stress of spherical particles increases slowly. With the increase of the size of Si particles, the stress and the stress concentration of Si particles in matrix are increased.
Experimental and Strength Analysis of the Trapezoidal Threaded Connection of Large-Scale Steel Tie Rod
Authors: Duan Wei
Published: February 2011

Steel tie rods are very important load-carrying components in places where high pre-stresses are required, such as in long-span buildings, docks, bridges and stadiums. Steel tie rods are connected by threaded connections. The bearing capacity of a steel tie rod is determined not only by the strength of rod’s body alone, but also by the strength of threaded connection. This paper reports the results of the full-scale tensile rupture experiments on a LG100-00 steel tie rod with trapezoidal threaded connection. The full-scale tensile rupture experiments were carried out to test the maximum axial working load under different numbers of turns of trapezoidal thread engagement. The minimum number of turns of trapezoidal threaded engagement such that the thread teeth do not fail in shear and bending is determined by the experiments and finite element analyses. The equivalent stress distribution and contact pressure on the engaged thread teeth under different axial loads are analyzed and compared. The concordant comparison provides strong guidelines and support for the design and fabrication of steel tie rods in practical operations.
The Design of Management Information System of Shipping Marine Engine Room
Authors: Wang Hong Zhi , Zhao Xiao Ling , Zhao Yang
Published: February 2011

With the applying of computer technology in shipping building field, and the intelligence is becoming stronger and stronger, the management of the ship is tending to rationalization, intelligence and automation. Thus, the management information system’s level of the ship has became an important sign in measuring of the sophistication of the ship . Therefore, marine engine data scanning and displaying, marine engine auto-controlling have become a main researching field. So the paper based on such condition.
Influence of Baking on Thermal–Expansion Ability of Quartz Sands
Authors: Jing Hai Ou , Wang Shu Hua
Published: February 2011

In order to understand the changing tendency of thermal–expansion abilities of used sands in foundry, the four groups of quartz sands were measured in this paper. The influencing laws of baked-times and temperatures on the property of quartz sands were analyzed. And the test results showed that volume thermal-expansion ratio of quartz sands decreases with increasing of the baked-times.
Study on Permanent Magnet Demagnetization Characteristics in Permanent Magnet Synchronous Machines
Authors: Liu Ji Zhu , Yu Xiao Hui , Wang Shao Hua , Sun Ming Chong
Published: February 2011

When Permanent Magnet Synchronous Machines (PMSM) working with rated load or overload, stator iron loss and copper loss, bearings friction loss, permanent magnet (PM) eddy-current all will cause PM temperature rise. In this condition, the PM is affected by the temperature and the stator of the reverse magnetic field generated prone to arouse demagnetization phenomenon, it will directly affect the performance of permanent magnet machines. Previous calculation method which used magnetic circuit method to analyze PM demagnetization characteristics cannot reflect the actual working condition of PM. Firstly, the calculation formula of PM thermal stability is deduced in this paper. Secondly, demagnetization characteristics are analyzed based on FEM, which can reflect the actual working condition of PM more accurately. This paper providing reference basis for optimum electromagnetic design, PM selection and optimum PM design.
Influence of Process Papameters by Vibrational Cooling-Shearing Slope on Microstructures of Semi-Solid ZAlSi9Mg Alloy
Authors: Liu Wen , Tan Jian Bo , Li Ji Qiang , Ding Xu
Published: February 2011

An experimental vibrational cooling-shearing slope was developed to prepare the ZAlSi9Mg semi-solid alloy. The results show that the molten alloy is nucleated heterogeneously under shearing of the gravitation and vibration on the inclined cooling plate surface. Primary α-Al phase converts gradually from the cellular dendrite into tiny spherical or granular crystal. Under 600°C of pouring temperature, 600mm of casting length and 50Hz of vibration frequency, the semisolid alloy melt with good microstructure can obtained. In the alloy melt the average grain size of the original α-Al phase is 50μm, and its shape factor is 0.71. Mechanical vibration can refine obviously the microstructure of ZAlSi9Mg alloy. Along with increasing of vibration frequency, the original α-Al phases are refined obviously, their roundness is improved.
Multi-Hierarchical Model Predictive Control Based on K-Means Clustering Algorithms
Authors: Liu Lin Lin , Zhou Li Fang
Published: February 2011

Multi-model predictive control has become an effective method for nonlinear system. But the traditional multi-model has large tracking error compared with desired output when it is used to solve the operating condition with large scale transition. To solve this problem, this paper presents a new structure of multi-model called multi-hierarchical model. The new structure consists of many layers that each layer is constituted of different number of multiple models. In each layer, multi-model is obtained by partial least squares method after k-means clustering algorithm divides the global working spaces into desired parts. Because of this special structure, the models chose from different layers can deal with the operating condition changed with large scale. At the end of this paper, experiments are carried on the pH neutralization process which is a MIMO nonlinear system and the simulation results demonstrate that the multi-hierarchical model is superior to single-hierarchical model with smaller model tracking error faster convergence speed and better stability.
Dish-Style High Concentration Photovoltaic System
Authors: Wang Zi Long , Zhang Hua , Zhang Hai Tao
Published: February 2011

Solar photovoltaic technology is one of main approach to the scale utilization of renewable energy, but it is still limited by its high cost of power generation and material shortage. Dish concentrating photovoltaic technology is promising for lowering the cost of power generation with its advantages of higher concentration and higher photovoltaic conversion efficiency and lower consumption of solar cells. A detailed description of dish concentrating photovoltaic system was given, which include concentrator and photovoltaic device. The application of dish concentrating photovoltaic system was particularized. Finally, a detailed discussion of its future potential.
Hysteretic Behavior Study of K-Shape Eccentrically Braced Steel Frame under Cyclic Loading
Authors: He Hai Jun , Hao Ji Ping , Cao Xian Lei
Published: February 2011

The seismic performance of K-shape eccentrically frames were researched by cyclic loading test method, in order to understand earthquake performance, stiffness degradation and dissipation mechanism of energy. It can be concluded that K-shape eccentrically frames provide high elastic stiffness and demonstrate excellent energy dissipation capacity in the plastic stage, the different length of the link beam of different layers has great influence on the energy dissipation capacity of the structure, when shear yielding of link beam occurs, stiffness degradation become apparent, the hysteretic curves were plump in shapes. Therefore, K-shape eccentrically frames have better hysteretic behavior and energy dissipation capacity, the results can provide a reference for the engineering design and related research.
Finite Element Analysis of Diesel Engine Cylinder Head Stress and Deformation with Thermal-Mechanical Coupling
Authors: Xue Guang Hui , Yu Xiang Song , Liu Pu Sheng
Published: February 2011

Considering the structure of some diesel engine cylinder head, its 3-D solid model and the finite element model is built, and after the load and constraint of is deal with, the stress and deformation the cylinder head with thermal-mechanical coupling is calculated with FEA ( Finite Element Analysis) software ABQUS. Analysis results find that: (1) the first main stress maximum value of cylinder head is up to 199.6MPa, which is less than 250MPa of the HT250 material ultimate tensile strength; (2) the deformation area is mainly in the flame face surface and fuel injector coxcombing, and the deformation of flame face is general symmetrical broadways and slightly large near the exhaust passage longways, while the deformation of fuel injector coxcombing is general symmetrical broadways and longways; (3) the structure design and strength of the cylinder head satisfy the design requirements.
Study on Modal Shape of the Vibration of an Axially Moving Cantilever Beam with Tip Mass
Authors: Wang Li , Chen Huai Hai , He Xu Dong
Published: February 2011

The transverse vibration equation of an axially moving cantilever beam with tip mass is given. The instant linearized equations are set up based on Galerkin’s method. The tip mass influences to the first three order modes of the beam are computed. The calculated responses using the modes with tip mass are compared with the results using the modes without tip mass. Modes without tip mass can replace the modes with tip mass while the tip mass is small. The heavier the tip mass is, the bigger the difference of using the replacement is. It is found that the experimental result is fit well with the theoretical result using the modes with tip mass.
Experimental Research on Pneumatic Cylinder’s Exhausted-Air Reclaiming Control Systems
Authors: Shi Yun Xu
Published: February 2011

In this paper, the constitution of an exhausted-air reclaiming system for pneumatic cylinders is studied. The effect of the system on the cylinder velocity characteristics and the control method are also researched. Experimental results show that attachment of a reclaiming device would not cause bad influence on the velocity stability if the switch point could be properly controlled. Experiments also indicate that the switch control differential pressure DPsw varies with Pc in receiver and the supply pressure Ps and affect the velocity stability of cylinders. Therefore for reclaiming more energy and making less influence on the cylinder velocity characteristics, the suitable switching-point and the value of DPsw are also tested and suggested.
Damage Mechanism of Plain Weave C/SiC Composites Subjected to Quasi-Static Indentation Loading
Authors: Zeng Qing Na , Lv Sheng Li , Yao Lei Jiang , Tong Xiao Yan
Published: February 2011

Quasi-static indentation (QSI) tests on plain weave carbon fiber reinforced silicon carbide (C/SiC) ceramic matrix composites (CMC) have been performed to study the damage evolution law and damage modes. Acoustic emission (AE) and Ultrasonic C-scan techniques are creatively used to monitor the damage process and detect the indented damage, respectively. The damage development process could be described by three evidently different stages: initial crack tips spreading along within the matrix, matrix cracking and delamination as well as fiber bundles breakage of different layers. The AE activity indicated that the main damage modes are matrix cracking and delamination in the first two stages, once the pressing force exceeds the peak load the damage mode will change into fiber bundles breakage. Moreover, the damage procured in the QSI test is slightly lower than that produced in the low velocity impact (LVI) test under the equivalent energy, the correspondence between the two test methods is reasonably good.
The Fault Tree Number Simulation on Automobile Braking Function in Losed
Authors: Yu Quan Yu , Zhu Cheng , Wang Zi Weng
Published: February 2011

With the aid of Monte-Carlo random sampling method, we establish the fault tree simulation model of the automobile braking function in losed,and set up the fault tree analysis simulation program SFTA,and work out the automobile mean time between failure (MTBF),failure probability and importance of bottom events.Moreover,by using the fault tree simulation program to analyze the reliability of the automobile system, we can not only settle the difficulty which the components contain nonexponent distribution, but also observe the contribution which each internal part makes impact on whole system reliability with the aid of the simulation running.This a great help to study the reliability of automobile braking system.
Aero-Thermal Response Analysis for Sharp ZrB2-SiC Leading Edge of Waverider
Authors: Lv Hong Qing , Dong Hui , Wang Zhen Qing , Meng Xiang Nan
Published: February 2011

Based on theory and semi-empirical formula, this paper uses the method of reference enthalpy to calculate the surface aerodynamic heating flux of waverider with sharp leading edge. On this basis, applying ultra high temperature ceramic materials ZrB2–SiC, thermal response of the sharp leading edge is studied. The results show that the aerodynamic heating can make thermal stress intensity extremum inside the structure exceed the ultimate strength of material quickly. Though the temperature inside the structure is much lower than material heat-resistant temperature extremes, thermal stress shock is able to cause material to damage in a very short time.
An Efficient Search Scheme in Unstructured Peer-to-Peer Networks
Authors: Gong Ya Dong , Deng He Ping , Gu Zhan Ran , Hu Ji Ye , Wen Yong Xiang
Published: February 2011

In peer-to-peer (P2P) networks, nodes are quite different from each other in many aspects, such as sharing resources, online time and bandwidth. Some approaches have been introduced to take advantage of the query forwarding and answering heterogeneity such that the high bandwidth and query answering capability of nodes can be fully utilized to improve the system performance. In this paper, we suggest using the online time heterogeneity to improve the search efficiency of P2P networks. In our proposed Differentiated Index (Diff-Index) algorithm, the nodes with long online time will have higher priority to be queried. Because the online time is quite different among nodes, much search traffic can be saved by querying only a small portion of a network. The query success rate can be kept high because the nodes sharing a great amount of resources tend to have long online time. Our simulation results show that the Diff-Index algorithm can save 66 percent of search traffic.
Investigation into the Mechanical Properties of Nanometric Zirconia Dental Ceramics
Authors: Hou Ya Li , Li Chang He , Wang Li Li , Ding Yu Cheng
Published: February 2011

This study was focused on the testing and assessment of the mechanical properties of nanometric zirconia dental ceramics. The density and the apparent porosity of specimens were tested with the Archimedes drainage method. The length variation of the specimens before and after sintering was measured with a vernier caliper, and the linear contraction was tested. An X-ray diffractometer was used for the specimen phase analysis. SEM was used to observe the section micrograph of the specimens. A universal mechanical testing machine was used to test the three-point flexural strength and the fracture toughness. A microhardness tester was used to test the Vickers hardness of the test specimens. Results indicates that the flexural strength of the test specimens ≥ 890MPa, the fracture toughness ≥6Mpa.m1/2, the Vickers hardness ≥ 1240MPa, the linear contraction ≥ 21%, and the apparent porosity ≥ 0.32%. Fully satisfying the requirements in oral medicine, the ceramic is an ideal material for biological joints and dental prosthesis.
An Ontology-Based Workflow Model Supporting Collaborative Product Development
Authors: Zeng Qing Liang , Ye Tie Li , Wan Li Rong , Lv Kun
Published: February 2011

Collaborative product development (CPD) is a dynamic collaborative process. A workflow model supporting CPD can provide a powerful and orderly workflow management for modern product development. This paper studies the requirements of CPD towards the workflow model, establishes a workflow metamodel supporting CPD process, proposes an idea of ontology-based workflow modeling and builds the workflow ontology model, which will strongly support interactive manipulation between the workflow management systems of collaborative product development.
Dynamic Performance Analysis for Collaborative Design Model of Machinery Products Based on Invariant Analysis
Authors: Guo Yin Zhang , Zeng Jian Chao
Published: February 2011

This paper studied the problem of deadlock performance analysis for collaborative design process model based on extended objective Petri Net (OPN). Firstly, the definition of CSCD extended OPN model based on decision rules has been proposed by analyzing the collectivity requirement for the machinery products collaborative design system to be built. Besides, models for the OPN model of process controlling nets and design unit objective class. Then OPN invariant analysis theory has been adopted to analyze the dynamic performance of deadlock to the part design unit by building its object communication net. The dynamic performance of the whole model could be obtained by analyzing the performance of all the design unit object class.
Thermodynamic Analysis of Damaged Thermal Protection System Tiles
Authors: Wang Zhen Qing , Meng Xiang Nan , Lv Hong Qing
Published: February 2011

Ceramic insulating tile is the main insulation material used on space shuttle thermal protection system at present, but this material has low strength, high brittleness and easy to be damaged. So the study of thermodynamic response of damaged rigid ceramic insulating tiles is very important. In this paper the temperature field and thermal stress field of the damaged ceramic insulating tiles under aerodynamic heating are simulated by ABAQUS code. The analyzed results indicate that the sharp degree of the damage shape has minor influence on the temperature field, but is more significant for the maximum thermal stress. Meanwhile the larger loading is, the bigger influence is.
The Elastic-Viscoplastic Field at the Mixed-Mode Crack-Tip under Compression and Shear
Authors: Wang Zhen Qing , Liu Fang , Liang Wen Yan
Published: February 2011

To further study the field of the mixed-mode interface crack tip under compression and shear, we analyze the problem on the quasi-static propagating of the interface crack theoretically and numerically.In this paper,we assumes that the artifical viscosity cofficient is in inverse proportion to power law of the plastic strain rate,and the stress of the interface crack possesses power law singularity. The viscosity of material,the friction touch effection of the crack-tip surface and the load hybrid parameter are considered. The asymptotic solution is established for elastic-viscoplastic field at the mixed-mode propagating crack-tip under comprission and shear.It is shown in numerical results and analysis that for the mixed-mode crack-tip field under compressing and shear is whole plastic without elastic unloaded section;viscosity effection is an important factor when propagating crack-tip field is studied; viscosity coefficient, mach number and singularity exponent are the control factors of singular field at the crack-tip.
Modeling and Simulation of Nonlinear Combination Disc-Spring Vibration Isolator for High-Speed Press
Authors: Zheng En Lai , Jia Fang , Zhang Zhi Sheng , Shi Jin Fei
Published: February 2011

With its variable stiffness, capability to provide friction damping by itself, and space-based adaptive performance, the disc spring, by replacing the cylindrical helical spring extensively, has found wide application in fields like aerospace, metallurgy, architecture, machinery and so on. For the nonlinear combination disc-spring vibration isolator, the mathematical model is established in this study on the basis of classical disc spring theories. The simulation results of the combination vibration isolator under simple harmonic excitation and the effects of damping ratio and different types of load on the vibration isolator are explored in depth, the findings of which help to lay a solid foundation for parameterization and serialization of the nonlinear combination disc-spring vibration isolator.
To Study the Effect of the Magnetic Field’s Alternative Direction in the Magnetic-Electrochemical Compound Polishing
Authors: Shi Li Min , Yong Jiang Niu , Ma Yong Feng , Liu Er Liang
Published: February 2011

In magnetic-electrochemical compound polishing, adding a magnetic field whose direction is parrallel to the electrical field’s directions and is charged alternatively, the velocity of changed particles cannot be accelerated obviously and the efficiency of chemical reaction cannot be promoted consequently, but the chemical reaction is well-distributed and the effect of the polishing is improved. In the paper, the velocity equation and loci equation of the charged particle in electromagnetic feild is concluded and analysed in magnetic-electrochemical compoud poshing in which an alternative direction’s magentic field is added. To be compared the charged particles in alternative direction’s magnetic field with the charged particles in static magnetic field carefully, the conclusion above is obtained. Moreover, a magnetic-electrochemical compound polishing head which can change the magnetic field’s direction easily is developed. At last, the conclusion is tested.
Resistance Responses of Polymer-Matrix Carbon Fiber Smart Layer to Normal Strain and Shear Strain
Authors: Zhu Si Rong , Li Jing , Li Zhuo Qiu , Zheng Hua Sheng
Published: February 2011

The paper makes a comprehensive study on the sensitivity of a new type strain sensor named polymer-matrix carbon fiber smart layer. The sensitivity to tensile strain was gained by a uniaxial tension test. By a three-point bending test on a FRP bar stuck by the smart layer, the sensitivity to compressive strain was revealed and a lower gauge factor was obtained compared to the sensitivity to tensile strain. In addition, a pure shearing test was designed, revealing the sensitivity to shear strain.
Numerical Study on Liquid Crystalline Actuators Using Back-Flow Effect
Authors: Liu Chun Bo , Yue Long Wang , Liu Xiao Xia
Published: February 2011

As a purpose of developing micro-actuators driven by liquid crystals, transient behaviors of a nematic liquid crystal between two parallel plates under an electric field have investigated numerically by using the Leslie-Ericksen theory. Twist angle has been selected as computational parameters. Imposition of an electric field on a liquid crystal induces backflow whose profile and magnitude depend strongly on the twist angle of the director. When the twist angle is 0 degree, the induced flow is planar, and with increasing of the twist angle, the flow has an out of plane component, and finally the profile becomes unidirectional when the twist angle reaches 180 degrees.
Activated Nitrogen-Enriched Carbon/Reduced Expanded Graphite Composites for Supercapacitors
Authors: Tong Shu Hui , Qin Chuan Li , Jin Zheng , Wang Xue Song , Bai Xu Duo
Published: February 2011

Activated nitrogen-enriched carbon/reduced expanded graphite composites (ANC/REG-c) with different composite ratio were prepared by in-situ polymerization, carbonization, activation and reduction of aniline and expanded graphite. These were characterized by XPS, SEM and electrochemical measurements. XPS shows that N atoms exist in the ANC and ANC/REG-c. Compared to mechanical mixture of ANC and REG(ANC/REG-m), ANC/REG-c shows lower resistance and higherCp1(185.4 F/g) vs 124.3 F/g of ANC/REG-m measured by CV due to the introduction of the composite sturcture. When the composite ratio of ANC/REG-c is 6:1, the ANC/REG-c shows the highestCp1(264.0 F/g) and its symmetric supercapacitor also shows the best synthetical electrochemical performances. The optimal supercapacitor presents good cycle stability. ANC/REG-c is a suitable electrode material for supercapacitors.
Functional Material and their Application in Water Environmental Protection
Authors: Zhu Li Nan , Wang Yong Jun
Published: February 2011

Among the functional materials, the ecological environment material is a new kind of materials. The ecological environment materials used in water pollution control process can be used as catalyst, absorbents and catalyst carrier. The functional materials investigated in this study were γ-A12O3, ceramisite pellet, γ-A12O3 loaded with nano-TiO2 and ferric hydroxide, respectively. The performance of these materials and the efficiency of organic pollutant removal in high voltage electric field with these materials in the reactor were studied.
Optimization Synthesis on Water Running Mechanism of Biped Robot
Authors: Xu Lin Sen , Li Bing , Xu Feng , Zhao Jiang Hai , Feng Bao Lin
Published: February 2011

A mechanism based on a four-linkage mechanism and a hybrid-drive six-linkage mechanism is designed to imitate the function of the basilisk lizard running on water. The kinematics analysis of the water running mechanism is carried out by using the linkage mechanism kinematics and the D-H method. Then the stability analysis of the mechanism is carried out according to the critical conditions. At last the mechanism is simulated and optimized for getting the maximum momentum in the slap phase and the maximum force in the stroke phase. And the simulation result shows that the mechanism can satisfy the requirement of biped water running.
Estimation of Physical Parameters Using Learning Algorithm in Precision Positioning Control
Authors: Hashimoto Seiji , Watanabe Hiroki , Nakajima Kenji
Published: February 2011

In this paper, a high precision control and a state estimation methods based on the learning algorithm are proposed. By means of the feedback error-learning method, at first, the variation of physical parameter is identified. Then, online estimation can be performed comparing the learned weighting coefficients in the neural network. The proposed method is applied to a precision control system, and is verified through the experiments.
Strain Measurement in Two-Dimension Stresses Based on Polymer-Matrix Carbon Fiber Smart Stripes
Authors: Zhu Si Rong , Kong Liu Lin , Li Zhuo Qiu , Lv Yong
Published: February 2011

The paper aims to sense strains of structures in two-dimension stress states and to perform a large-region strain monitoring. Polymer-matrix Carbon Fiber Smart Stripes (CFSS) distributed in two ways are stuck on a bending plate to detect strains using the piezoresistivity of CFSS. Monotonous tests are conducted to calibrate the surface piezoresistivity of the CFSS and then cyclic tests are conducted to measure the strains of the structure using the constitutive relation of CFSS. Results show the experimental values by CFSS fairly good with those by gage factors.
A Real-Time Campus Guidance System Based on Energy Efficient Location Determination Method
Authors: Lin Chun Hao , Liu Yen Szu , Chen Chi Hua , Lin Bon Yeh , Lo Chi Chun
Published: February 2011

Recently guidancesystem is becoming more popular, as more people realize its benefits. There have been many developments on campus guidance system (CGS) in personal digital assistant (PDA) and smart phone. The building and promotion of the energy efficient location determination method is an important part of CGS. The cellular-based location determination using RSS from cellular network is more immediately, power-effective, and easy to deploy and maintain than traditional methods. In this paper, we design the CGS which provides the fingerprint position algorithm (FPA) using RSS from cellular networks and location-based service (LBS) for user reference. In experiments, we compare the estimated positioning information with the real information from global position system (GPS) receiver. The results show that the error of location estimation using FPA is about 9.92 meters. This approach is feasible to be applied to CGS.
Research on Fuzzing Test Data Engine for Web Vulnerability
Authors: Guan Quan Long , Yao Guo Xiang , Ni Kai Bin , Zhou Mei Xiu
Published: February 2011

With the rapid growth of e-commerce, various types of complex applications appear in web environments. web-based system testing is different from traditional software testing. The unpredictability of Internet and web systems makes it difficult to test web-based system. This paper presents an engine for Fuzzing test data towards web control vulnerabilities, and introduces "heuristic rules" and "tagged words" to generate the test data. This method can increase the intelligence of security testing and build the foundation of web vulnerability detection model.
Fault Diagnosis of Bearings Based on Time-Delayed Correlation Demodulation and Fuzzy Clustering
Authors: Fu Pan , Li Wei Lin , Cao Wei Qing
Published: February 2011

As one of the most common parts of various rolling mechanical equipments, rolling element bearing is vulnerable. Therefore, great attentions have been attributed to the theories, failure diagnosis methods and their applications for rolling bearings. Vibration analysis is also a very important means for bearing fault diagnosis. This paper aims at the research on the methods of signal processing and pattern recognition. An experimental platform was set up for the failure diagnosis of rolling bearings, on which we have done a lot of experiments. Then the vibration signals of normal rolling bearings, rolling bearings with failure on the outer and inner race were collected. Time-delayed correlation demodulation was applied and the features of vibration signal were effectively extracted. Fuzzy C-means clustering system was established to carry out the recognition of the fault of bearings. Experimental results have proved the developed fault diagnostic architecture is reliable and effective.
Fabrication and Characterization of Bonded NdFeB Microstructures for Microelectromechanical Systems Applications
Authors: Tao Kai , Ding Gui Fu , Yang Zhuo Qing , Wang Yan , Wang Pei Hong
Published: February 2011

A micromachining technique has been developed for the fabrication of microscale polymer-bonded magnet. Two types of lithographically defined molds, photoresist mold and electroplated metal mold, were introduced. Photoresist mold is convenient, while electroplated metal mold can be fabricated on the glass or steel substrate which can bear much more compression. NdFeB films of thickness between 50 and 500 µm were prepared by micro-patterning of composites containing 83-95wt% of commercial NdFeB powder after curing at the room temperature. Magnetic properties mainly depend on the types and percentage of volume loading of magnetic powder. Coercivity of 772.4kA/m (9.70kOe), remanence of 275.1mT (2.751kG), and energy product of 22.6kJ/m3 (2.8MGOe) have been achieved. This easily developed magnet could be a promising candidate for applications in magnetic microelectromechanical systems (MEMS).
Designing and Manufacturing on New Structure of Variable Speed Fluid Couplings
Authors: Shao Wan Zhen , Wu Guo Qi , Wang Li
Published: February 2011

This paper main introduces design thought and method of a New structure of variable speed fluid couplings and innovation of design and difficult of manufacturing. It have reference value for personnelof fluid couplings design and manufacturing.Using software and FEM theory analyzed pump wheel strength. The pump wheel strength reliability was proved. It provides the design method of calculating the effective for this new hydro-couplings design.
Research on Intelligent Control System of Pressure Forming Equipment for Stator and Rotor
Authors: Fan Hong Mei , Wang Shang Bin , Sun Yu
Published: February 2011

An intelligent control system of pressure forming equipment for stator and rotor is presented. The architecture of the high-speed stamping product line is introduced first. Then the function of the control system is analyzed and the control system is designed. Finally, the stamping process is studied and the intelligent stamping process optimizing system is developed.
Mechanism Simulation Based on ADAMS and Structure Optimization for Automobile Punching Parts On-Line Detector
Authors: Rao Xi Xin , He Kang , Liu He Sheng
Published: February 2011

Camera Device is crucial components of Automobile punching parts on-line detector and Its dynamic characteristics has a critical influence on the accuracy of Automobile punching parts on-line detector. To reduce the relative acceleration of Camera Device to the measured part, biaxial body of Automobile Punching Parts On-line Detector was optimized. On the basis of analyzing mechanism, simplifying the prototype, determining the design variables and the objective function and the constraint condition, this paper puts forward the parameter optimization mathematic model with the minimum of the acceleration of Camera Device relative to the point on the measured work piece as objective function and completes mechanism simulation and optimization by the ADAMS software. The results show that some design parameters gets more reasonable and dynamic performance of Automobile punching parts on-line detector is better.
Design for Database of Energy Project Management Based on Portfolio
Authors: Wu Yun Na , Li Jiang Shuai , Wang Jia Li
Published: February 2011

With the continuous development of energy projects and the actual needs of the project, project portfolio management technique is known by people more and more. However, current databases of energy project management system are too different. This paper studies actual demand of energy project database, taking portfolio management theory as the basic, and use database modeling technology to build database’s conceptual data model, logical data model and physics data model based on the portfolio of energy project management. These models can be very good instruction of energy database design and construction, and will support energy project portfolio management system design to some guidance.
Tool Path Planning and Machining Experiment for a Centrifugal Impeller Based on Five-Axis Machine Tool
Authors: Zhao Yu Xia , Di Jie Jian , Gao De Wen
Published: February 2011

An impeller is the core of aviation engine components, the processing quality have a decisive impact on the performance of the engine. An impeller is one of most important basic components of centrifugal compressor. However, it is very difficult to machine and model because of the twisted blades. For such geometric complexity, it is the general practice to adopt five-axis machining. Based on the actual engineering data, pro/Engineer software is applied to produce three-dimensional geometric model of the integrated impeller, some general principles followed by machining and modeling the impeller are brought forward. Furthermore, analysis and research were made for tool path of the integrated impeller machining. NC program is exported successfully to DEMAGE five-axis machine from PowerMill software where machining verification as a centrifugal impeller example was carried on. The results of verification show that the machining methodology and procedure adopted are successful.
The Synthesis of Silicon-Containing Epoxy Resin and its Application in Environmentally-Friendship Epoxy Molding Compound for IC Packaging
Authors: Yang Ming Shan , Liu Jian Wei , Li Lin Kai
Published: February 2011

Silicon-containing epoxy resin (CNE-Si) was synthesized from diphenylsilandiol (DPSD) and ortho-cresol novolac epoxy resin using SnCl2 as catalyst. The chemical structure of CNE-Si prepared in this paper was characterized by 1H-NMR and FTIR. The thermal stability was analyzed by TGA. The result showed that the –Si- group enhanced the thermal stability of the epoxy resin. The curing kinetics of the system was studied by non-isothermal DSC. The kinetic parameters of the curing reaction including the activation energy were calculated using Kissinger and Ozawa method. The results showed that the system containing CNE-Si has lower curing temperature and more quick curing speed compared to CNE, which can be used for manufacturing the quick-curing EMCs or afterward-curing-free EMCs.
Research on Numerical Simulation of Thermodynamic Performance in Forced Circulation Solar Water Heating System
Authors: Chang Zheng , Jia Lei
Published: February 2011

Using numerical simulation to study solar water heating system it will be fast to obtain data and have a reasonable conditional statistical forecast. In this paper, based on the numerical model of an actual forced circulation solar water heating system, the whole year thermodynamic performance in a forced circulation solar water heating system are simulated and studied. It is shown that the efficiency of energy utilization and the heat loss of collectors in the system are closely related with the out door temperature and main efforts should be on the collectors.
Design and Analysis of Hydrostatic Bearing Slide Used Linear Motor Direct-Drive
Authors: Hou Guo An , Sun Tao
Published: February 2011

This paper discusses the design and analysis of a direct-drive linear slide used linear mortor. The alloy steel carriage is fully ﬂoated by twelve hydrostatic bearings, and it is force-closed. It has very high stiffnesses, 1700N/mm in vertical direction and 690N/mm in horizontal direction. The working stroke of slide is 200 mm. The slide is driven by a ironless linear motor. The optic linear encoder was used for the measurements and feedback. To analyze the static and dynamic performance of the slide, the modelling and simulation process, using the finite element analysis method, is presented.
An Improved Thermal-Electric-Displacement Coupled SPS FEM Simulation
Authors: Song Yi , Zhou Zhao Yao , Chen Zhi Cheng , Ye Yong Quan
Published: February 2011

This paper proposed an improved thermal-electric-displacement FEM model for spark plasma sintering (SPS), which fully considered the variations of therma-electrical material parameters, contact resistances and contact boundaries due to the densification process. The simulation shows that such an alterable boundary condition builds a remarkable temperature gradient in the axial direction along the inner wall of the die, and the local change of the temperature at the contact interfaces can be described more exactly. The experiment and the simulation are in a great agreement. The developed SPS model can be used as an aiding tool to optimize the SPS process parameters of metal powders.
Study of a New Stair-Climbing and Obstacle-Traversing Robot
Authors: Yue Long Wang , Wu Ke Yan , Liu Chun Bo
Published: February 2011

The author introduced a new stair-climbing and obstacle-traversing robot system. According to its working environment, the parameters of driving wheels were determined with the optimization target of rotation axis’s undulation amplitude; The gear ratios of the driving planetary gear train were determined by running resistance, which can realize the automatic switching between rotation and revolution; According to its applicable situation, the robot’s control system was designed as a human-machine interaction model.
Research on P-Hub Network Based on Rough Set: Model and Algorithm
Authors: Liu Qing , Wu Tong Shui , Luo Xian Fei
Published: February 2011

To solve the classical uncapacitated multiple allocation p-hub median problem, (UMpHMP), this paper establishes the evaluation System of hub-index by making use of the rough set data mining technology to reduce the range of hub choice from n alternative hubs to the limited q(q<n) airports, which greatly reduces the variables and constraints of the UMpHMP model. To solve the NP-hard problems, the genetic algorithm was designed according to the improved model for solutions. The simulation example of domestic 15 cities the route network designing indicates that the new model can reduce the solution complexity and increase the efficiency.
Anti-Control of Chaos of Single Time Scale Brushless DC Motor System with Unknown Parameters Using Adaptive Control
Authors: Akhgari Farzaneh , Rahmani Zahra , Rezaie Behrooz
Published: February 2011

In this paper, an adaptive feedback control method is proposed for the anti-control of chaos of single time scale brushless DC motor system with unknown parameters based on model-matching. The well-known Rössler chaotic system is considered as the reference system. The chaotification is achieved choosing an appropriate control law and a parametric updating law using Lyapunov stability theory, which provides the stability of the resulting adaptive system and the convergence of the tracking errors to zero. The numerical simulation results show the effectiveness of the proposed method.
Construct Concept Structure for Linear Algebra Based on Cognition Diagnosis and Clustering with Mahalanobis Distances
Authors: Chen Chin Chun , Lin Yuan Horng , Yih Jeng Ming , Juan Shu Yi
Published: February 2011

Euclidean distance function based fuzzy clustering algorithms can only be used to detect spherical structural clusters. The purpose of this study is improved Fuzzy C-Means algorithm based on Mahalanobis distance to identify concept structure for Linear Algebra. In addition, Concept structure analysis (CSA) could provide individualized knowledge structure. CSA algorithm is the major methodology and it is based on fuzzy logic model of perception (FLMP) and interpretive structural modeling (ISM). CSA could display individualized knowledge structure and clearly represent hierarchies and linkage among concepts for each examinee. Each cluster of data can easily describe features of knowledge structures. The results show that there are five clusters and each cluster has its own cognitive characteristics. In this study, the author provide the empirical data for concepts of linear algebra from university students. To sum up, the methodology can improve knowledge management in classroom more feasible. Finally, the result shows that Algorithm based on Mahalanobis distance has better performance than Fuzzy C-Means algorithm.
Construct Knowledge Structure of Linear Algebra
Authors: Chen Chin Chun , Lin Yuan Horng , Yih Jeng Ming , Huang Sue Fen
Published: February 2011

Apply interpretive structural modeling to construct knowledge structure of linear algebra. New fuzzy clustering algorithms improved fuzzy c-means algorithm based on Mahalanobis distance has better performance than fuzzy c-means algorithm. Each cluster of data can easily describe features of knowledge structures individually. The results show that there are six clusters and each cluster has its own cognitive characteristics. The methodology can improve knowledge management in classroom more feasible.
The Evaluation of Supplier Performance - A Case Study Approach
Authors: Wang Li Chuan , Fan Chwei Jen , Chuang Huan Ming
Published: February 2011

This study adopted business intelligence tools to implement a platform for supplier evaluation, bases on data from the material management module of its ERP system firstly, and tried to further improve the acceptance of the system. Qualitative research method was applied on this regard. Intensive interviews with members from procurement, quality assurance, and material management departments were conducted with interview framework established from Information System Model. The information garnered from the interviews was analyzed with Formal Concept Analysis (FCA). Major conclusions were used to improve the supplier evaluation system. Based on statistics data about system usage, the improvement gained significant success.
Stress Wave Propagation Discipline and Simulation Analysis in Non-Homogeneous Laminated Composites
Authors: Yao Jia , Wu Wan Jiang , Li Ya Qin , Han Ming Hui , Jiang Li Wei
Published: February 2011

Application of stress wave testing methods can realize non-destructive testing of composites, but non-homogeneous characteristics of composites determine the complexity of stress wave propagation. Using the stress wave theory to explain the propagation principle, to describe the stress situation in the composites, which is meaningful to perfect the stress wave testing method. In this paper, stress wave propagation principle of non-homogeneous laminated composites has been revealed, mathematical descriptions of stress wave propagation are also given, and finite element simulation method has been used to verify the theory.
A Method for Design of Oblique Intersection Beams in Roof Structures
Authors: Zhang Tao
Published: February 2011

To facilitate calculation of a reinforced concrete oblique intersection beams in roof structures, the analysis ignores the interaction between moment and torque of node position, assuming the beam ends as hinge supports. Vertical displacement coefficients were found out by unit-load method, the compatibility equation of displacement was set up by the conditions of equal displacement at nodes, which can finally calculate force diagram of beams, and further design beam section. When designing, it is necessary to note reinforcement calculation should be taken into account the change of beam effective cross-section high caused by longitudinal tension reinforcement layer placed. Compared with the engineering example show that the design method is more simple and accurate, the results can provide a reference for the engineering design and related research.