bluuebunny/crossref_metadata_2025 huggingface dataset:
Maximal Frequent Item Sequences Mining of Datasets with few Attributes and Large Instances
Authors: Zhou Li Juan , Zhang Zhang , Li Shuang
Published: December 2010

This work proposes a new fast algorithm named MFISS-FG (maximal frequent item sequence sets fast generating) finding maximal frequent item sequences from relational database. It adapts to datasets with few attributes and large instances. Itemset is defined as IS (item sequence) for mining. Two lists called ISL (Item Sequence List) and FISL (Frequent Item Sequence List) are created by scanning database once for dividing n-IS into two categories depending on whether the IS to achieve minimum support number (n is the number of attributes). SIS (Sub item sequences) whose n-superset is in ISL are generated by recursion to make sure that each k-SIS appeared before its (k+1)-superset (k range from 1 to n-1). As current k-SIS being joined to FISL, its (k-1)-SIS are pruned (k range from 2 to n-1). At last, all SISs whose n-superset is in FISL are pruned from FISL to hold all maximal frequent item sequences. We compare our MFISS-FG and FP-Growth by a set of time-consuming experiments to prove the superiority of MFISS-FG both not only with increasing datasets but also with changing mini-support.
Effect of Lubricant in Output Parameters of Milling
Authors: Mahdavinejad Ramezan Ali
Published: December 2010

The usage of lubrication in machining processes especially in high speed milling is very important. In this research, some steel samples are machined with and without cooling lubricant conditions. In these cases, the material removal rate and surface finishing of machined surfaces are analyzed. The comparison between two conditions shows that the usage of lubricant as coolant material, improves the output machining parameters significantly.
A Network-Centric Architecture for Combat Simulation System Model
Authors: Shen Jian Jun , Tian Hua , Gan Zhi Chun
Published: December 2010

When developing a combat simulation system model, how to design its architecture determines if the final simulation result is satisfying or not. Here, a novel network-centric architecture is brought forward to support the modeling for combat simulation systems. This architecture takes the communications network model as the basis platform, enable various combat entity models being flexibly plugged to the network model platform. Then, as the core of this architecture, the communication network model is researched weightily, such as the model resolution, hot swapping model design, network scenarios’ generation, and so on.
Comprehensive Evaluation Model-Based Fuzzy Math of Tailings Dam Stability
Authors: Wang Fei Yue , Xu Zhi Sheng , Dong Long Jun
Published: December 2010

Aiming at the high occurrence of accident at broken tailing dam and its significance in safety, the defects of evaluation methods currently used were pointed out. Considering that the safety system was a multiple-factor and multiple-layer system, a new evaluation based on fuzzy math was presented. A more rational comprehensive evaluation index system is proposed. The weight of each factor was also obtained, and corresponding safety evaluation model was set up by fuzzy math. The model is applied to lead-zinc tailings dam of QingshuiTang in Hengyang City of China. Results show that this method is practicable and reasonable. It provides a new method to evaluate stability of tailing dam.
Optimization Algorithm for Solving a Kind of Mathematical Problems
Authors: Jiao Hong Wei , Li Kun
Published: December 2010

In this paper, we develop an algorithm to globally solve a kind of mathematical problem. Firstly, by utilizing equivalent problem and linear relaxation method, a linear relaxation programming of original problem is established. Secondly, by using branch and bound technique, a determined global optimization algorithm is proposed for solving equivalent problem. Finally, the convergence of the proposed algorithm is proven and numerical examples showed that the presented algorithm is feasible to solve the kind of mathematical problems.
Simulation Platform Development for Random Space Vector PWM
Authors: Chen Guo Qiang , Kang Jian Li
Published: December 2010

The RSVPWM (Random SVPWM) is one key type of technology in the motor control and other electronic power transformation applications because of many advantages. The detailed procedure to build the simulation model of RSVPWM is presented and discussed. The ports and parameters, the program flowchart and the method to realize the randomization are given and illustrated. The built model can simulate random frequency SVPWM, random zero-vector distribution SVPWM and random pulse position SVPWM. The simulation results verify the model.
A Pruning Method Based on Conditional Misclassification
Authors: Xu Wei Xiang , Xu Jing , Liu Xu Min , Dong Rui
Published: December 2010

The methods of pruning have great influence on the effect of the decision tree. By researching on the pruning method based on misclassification, introduced the conception of condition misclassification and improved the standard of pruning. Propose the conditional misclassification pruning method for decision tree optimization and apply it in C4.5 algorithm. The experiment result shows that the condition misclassification pruning can avoid over pruned problem and non-enough pruned problem to some extent and improve the accurate of classification.
A Fault Predication Algorithm Based on Artificial Immune Particle Filter
Authors: Qiao Yu Kun , Zhang Qi , Zhang Jin Sheng
Published: December 2010

Degeneracy problem is an inevitable result of sequential importance re-sampling (SIR) particle filter, and a mass of degenerated particles will influence the tracking ability of particle filter seriously. As a result, SIR particle filter based predication algorithm can’t predict system faults accurately. Artificial immune algorithm is characterized by a global ability to search for optimum, so it is introduced into the particle filter, named artificial immune particle filter (AIPF). Particles are regarded as antibodies in AIPF and particles with large weight aberrance and are cloned, and then the better particles are selected for states evaluation. A fault predication algorithm based on AIPF is proposed to improve the predication accuracy, and simulation results have demonstrated the feasibility of the proposed algorithm.
Embedding the Importance of Commercialisation of University’s Research in the Engineering Education in Malaysia
Authors: Hussain Wan Mohd Hirwani Wan , Rahman Mohd Nizam Ab. , Yaakub Noor Inayah , Zainol Zinatul Ashiqin , Mujani Wan Kamal
Published: December 2010

This paper analyses the importance of embedding the importance of commercialisation of University’s research in the Engineering education in Malaysia. By conducting courses or program about this commercialization aspects by the engineering faculty, the commercialization process for the university will be sustained in future. The literature so far reviewed shows that engineering education processes have been extensively studied to study the best mechanism and model for engineering education in Malaysia. Aiming to contribute to such literature, we look at the current practice of Engineering Faculties under the Malaysian Research Universities in order to see to what extent aspects of commercialization of university’s research are incorporated in their syllabus. We found that the aspect of the commercialization of university‘s innovation are less exposed to engineering students in Malaysia. This paper suggests that it is vital to incorporate the commercialization of university’s research aspects into the engineering syllabus to develop the culture of entrepreneurship among engineering students which eventually assists the university to commercialize its’research.
Real-Time 3D Space Coordinate Acquisition of Medical Visualization Data
Authors: Hu Zhan Li , Gui Jian Bao , Zou Jing , Rong Jun Yan , Zhang Qi Yang , Xia Dan , Zheng Hai Rong
Published: December 2010

Medical visualization refers to the techniques and processes used to create images of the human body for clinical purposes or medical science including the study of normal anatomy and physiology. The visualization of medical images data sets is to reconstruct 3D images with the 2D slice images so as to reveal the 3D configuration of organs through human visual system. Visual C++ are used to reconstruct 3D images using the CT slice sequence. The key algorithms and human CT 3D visualization results are given in this paper. The coordinates can be acquired by the mouse clicking in the 3D space, by which to realize the point coordinate acquisition of the 3D medicine images. The visualization of medical images can provide us with more information and means of visual interactive for simulated operations and assistant diagnosis. The technique can realize the real time interaction quantitative measurement of three-dimensional CT image.
The Static Structural Complexity Metrics for Large-Scale Software System
Authors: Zhang Hao Hua , Feng Wen Jiang , Wu Li Juan
Published: December 2010

Measuring the complexity of a large-scale software system has been a urgent demand in software development practices. The traditional software metrics can hardly describe the structural complexity in modern software. As the complex networks theory has been used to study the software structure, we analyzed a great many software systems. The analyzing results reveal the parameters in complex networks can be used to represent property of software structure. And this paper introduces some efficient metrics and measuring methods based on basic parameters in complex networks. A practice example was described to demonstrate the effectiveness of the metrics.
Effect of Sine Bar Manufacturing Accuracy on Angle Measurement
Authors: Wang Hong Min
Published: December 2010

Sine bar is a practical accurate measuring implement which can measure indirectly or a machining tool for the accurate angle by sine principle. The effect of sine bar manufacturing accuracy on angle measurement is expounded by the angle measurement and calculation of the sine bar in this paper. Then the conclusion can be drawn that the angle can be get by measuring the length accurately through sine bar, and measuring a small-angle by sine bar which can reach the higher accuracy.
Research on Flame Simulation Based on Improved Particle System and the Texture Mapping
Authors: Ni Jian , Liu Hong Xia
Published: December 2010

Flame simulation in computer graphics has been the most challenging problems. According to the key problem of real time and reality in flame simulation based on particle system, a new flame model based on improved particle system and the texture mapping is proposed in this paper. This article uses specific geometric shape as the elementary particles and combines treatment of derivatives based on the flame of the original particle system to simplify some of the dynamic equation, to reduce the difficulty of computational modeling and improve rendering speed; Through texture mapping and particle mixing effects to achieve flame changes color in different regions and reflect the temperature difference between them; In addition, the method also reflects the dynamic field of the particle system.
Development of a Unified Resource Base for E-Learning
Authors: Lu Shao Fei , Yang Hong , Yang Guan Zhong
Published: December 2010

In this paper we propose the notion of unified resource base to simplify the resource exchange, sharing, and access, especial for e-learning. To illustrate the feasibility and advantages of such a unified resource base, we also design and implement a uniform resource management system (URMS). We discuss its functionalities, present its architecture, and demonstrate how its components can be implemented based on current technologies.
Study on the Dynamic Characteristics Analysis and Failure Prognosis of a PWA
Authors: Ren Jian Feng , He Min , Xu Jin Fei
Published: December 2010

The damage of the printed wring assembly (PWA) was treated as one of the main factors of the failure of electronic equipment. Thus the PWA must be studied and investigated. As the important prerequisite of the study, the dynamic characteristics of the PWA were determined in this paper. Here the dynamic characteristics of the PWA were modeled and analyzed by finite element analysis (FEA) method firstly, and then the experimental modal analysis (EMA) method was also used to study the dynamic characteristics of the PWA. The results obtained from above two methods were compared with each other, and good correlation was shown. So the correctness and accuracy of the FEA model was verified. On the base of that, the Z-axis (the normal of the board) of the PWA was determined as the main direction to be excited; subsequently the main modes in that direction were also determined. Furthermore the principle described as the components crossed by bend lines are detrimental to solder joint survival was used to prognosticate the packages which may be damaged.
Study of Pavement Identification Approach Based on Wavelet Analysis
Authors: Sun Ren Yun , Shan Yu Mei , Wang Bo
Published: December 2010

The pavement identification approach based on wavelet analysis applied to the vehicle electronic control brake system on varying pavement is studied. According to the approach based on vehicle model, wheel velocity, brake cylinder hydraulic pressure and the approach based on lateral acceleration, longitudinal acceleration of the body, signals of pavement adhesion coefficient with interference are estimated respectively, three approaches including wavelet multi-resolution analysis, wavelet analysis with soft threshold de-noising and wavelet multi-resolution analysis with singular value decomposition de-noising are adopted to do the de-noising study and result comparison analysis of the pavement adhesion coefficient with interference, then the application characteristics of the three analysis approaches in the estimation of varying pavement adhesion condition are expounded. The results show that the wavelet multi-resolution analysis can improve the validity and precision of the estimated pavement adhesion state characteristic signal as well as the control accuracy and adaptability of the electronic control brake system on varying pavements.
Research on License Plate Recognition Technology
Authors: Ma Zhen , Li Jian Lei , Tan Xue Fei
Published: December 2010

With the growth in number of vehicle, intelligent vehicle management has become the research hotspot, and license plate automatic recognition system is also of great concern as a important technology of intelligent traffic system. In this paper, Hough transform used to edge extraction, tilt correction algorithm and character recognition based on Haursdorff distance are discussed. At last, the license plate recognition system is designed and implemented, and then the experimental result is analyzed.
Human Tracking Method Based on Maximally Stable Extremal Regions with Multi-Cameras
Authors: Zhang Li , Dai Guo Jun , Wang Chang Jun
Published: December 2010

With respect to the human tracking with multi-cameras in the video surveillance system, a human tracking method based on MSER (Maximally Stable Extremal Regions) was established. The approach transforms the human tracking into elliptic region matching. The method does elliptic region fitting to each MSER, and then selects the elliptic regions which meet some constraints. These selected elliptic regions are normalized to unity circular regions. The right matched elliptic regions are gotten by rotational invariant vectors calculation, histogram density estimation and weighted average distance calculation. Experimental results show that the approach can effectively realize the human tracking with multi-cameras.
The Application of Agent Technique in E-Commerce
Authors: Zhang Hai Bin , Zhu Fang Yang , Zhu Nian
Published: December 2010

As one of the most potential field in today’s society, E-Commerce is coruscating vigorous vitality. Development of the information and network technology provide possibility for some new technology in e-commerce application, the application of new technology will also promote e-commerce to a higher level, Agent technology is one of the new technology, it is a product with the complete development of distributed computing and artificial intelligence technology, it has the advantage of autonomy and initiative and provide structure fundament for advanced stage of e-commerce activities. The Agent technique made users on longer lost in the changing product information. Enterprise can provide personalized service vary from person to person when they faced a lot of users and fundamentally improved problems in e-commerce. It will promote the development of e-commerce.
A Prediction Method of Power Energy Saving Potential Based on Rough Set Neural Network
Authors: Li Jin Ying , Wei Ya Jun , Li Jin Chao , Zhao Yu Zhi
Published: December 2010

Power industry is the key field of implementing energy saving and pollutant emission reduction in china, strengthen power energy saving is helpful to establish a resource-saving and environment-friendly society and promote a sustainable development of economic society. This paper synchronizes respective advantages of rough set and neural network, puts forward a prediction model-RSBPNN which uses rough set knowledge reduction method to prune the redundant and neural network to build a forecasting model.
Generation Method for Specification Surface Model of Flatness
Authors: Kuang Bing , Cheng Xiong , Huang Mei Fa , Sun Yong Hou , Wang Yu Xuan
Published: December 2010

In the new geometrical product specification (GPS), the specification surface model is a new concept in the new-generation geometrical product specification, which is the bridge to connect between nominal model and real model. To solve the problem for generate specification surface model of flatness, a generation method for generate specification surface model of flatness is presented in this paper. Based on the composing of real surface, specification surface model of flatness is classified to three factors: function requirement factor, manufacture process factor, and roughness factor. Aimed at the different characteristic of each factor, generation model for function requirement factor, manufacture process factor, and roughness factor are built respectively. Finally, a plate part is applied to illustrate the proposed generation method for specification surface model of flatness.
Optimization Strategy of Bidirectional Join Enumeration in Multi-Core CPUS
Authors: Chen Yong Heng , Zuo Wan Li , He Feng Lin
Published: December 2010

Most contemporary database systems query optimizers exploit System-R’s Bottom-up dynamic programming method (DP) to find the optimal query execution plan (QEP) without evaluating redundant sub-plans. As modern microprocessors employ multiple cores to accelerate computations, the parallel optimization algorithm has been proposed to parallelize the Bottom-up DP query optimization process. However Top-down DP method can derive upper bounds for the costs of the plans it generates which is not available to typical Bottom-up DP method since such method generate and cost all subplans before considering larger containing plans. This paper combined the enhancements of two approaches and proposes a comprehensive and practical algorithm based graph-traversal driven, referred to here as DPbid, for parallelizing query optimization in the multi-core processor architecture. This paper has implemented such a search strategy and experimental results show that can improve optimization time effective compared to known existing algorithms.
Adaboost Classification-Based Object Tracking Method for Sequence Images
Authors: Jia Jie , Yang Yong Jun , Hou Yi Ming , Zhang Xiang Yang , Huang He
Published: December 2010

An object tracking framework based on adaboost and Mean-Shift for image sequence was proposed in the manuscript. The object rectangle and scene rectangle in the initial image of the sequence were drawn and then, labeled the pixel data in the two rectangles with 1 and 0. Trained the adaboost classifier by the pixel data and the corresponding labels. The obtained classifier was improved to be a 5 class classifier and employed to classify the data in the same scene region of next image. The confidence map including 5 values was got. The Mean-Shift algorithm is performed in the confidence map area to get the final object position. The rectangles of object and background were moved to the new position. The object rectangle was zoomed by 5 percent to adapt the object scale changing. The process including drawing rectangle, training, classification, orientation and zooming would be repeated until the end of the image sequence. The experiments result showed that the proposed algorithm is efficient for nonrigid object orientation in the dynamic scene.
Study on Bi-Level Programming Model for Traffic Control on Massive Activities
Authors: Zhang Liang Zhi , He Mi Nai
Published: December 2010

In the massive activities of cities, rush hour is temporary while hot roads are congested seriously. Traffic flows are unbalanced severely in two aspects of time and space. Traffic control program is key point while few researches put emphasis upon it. In this paper, a bi-level programming model to make traffic control measure is brought forward. In upper level, providing key member with high transportation service is first thought over, and then the sum of travel delay of the masses and cost of traffic control is minimized. In lower level, evacuation delay of activities personnel is designed to ensure no traffic jam emerged. Rough set genetic algorithm is employed to solving bi-level programming problem in the paper, and an example of traffic control to massive activity verifies the validity of the proposed model.
Computation Model of Case Similarity Based on Uneven Weight Distance Coefficient
Authors: Hou Shou Ming , He Li Juan , Xu Wen Peng , Fan Hua Tao , Sheng Zhong Qi
Published: December 2010

In order to solve the retrieval problem of design example in rapid response design, similarity computation model among design examples is given, computation of attribute weight of design example is done based on the method of uneven weight distance coefficient, computation of similarity between product structure model that meet the requirement of customers and design examples existed is done by the method of combination weight. This method has been applied in rolling guide conceptual design based on example inference, the result indicated that the weight computational method proposed is simple and the reliability is good, it can solve the intelligent retrieval problem of design examples in rapid response design.
Automatic Fuzzy Based System for Carbon Estimation in a Basic Oxygen Furnace
Authors: Zhang Meng , Chen Yan Ru , Xu Ling Fei , Wang Yong Qing
Published: December 2010

Molten metal carbon is an important parameter to be controlled during the BOF operation. In this paper, a fuzzy logic system for carbon sensing in a basic oxygen furnace (BOF) is presented. This objective system is identified from input-output data of the system by applying the subtractive clustering algorithm. The input data presents the optical radiations emitted from the BOF mouth and the output presents the carbon content of the molten metal contained in BOF in order to provide an efficient decision support application. The variables employed to develop the fuzzy logic system are obtained through an optical sensor located adjacent a full scale BOF at Nanjing steels’. Preliminary results are really encouraging.
Reading and Controlling on UG Files by OpenGL Based on Object-Oriented Methods
Authors: Sui Xiu Lin , Li Ya Ze , Zhang Jia Tai , Jiang Ji Wu
Published: December 2010

Aimed at the problem of reading and controlling UG files by OpenGL in VC++ environment, a method of object-oriented programming is proposed. The OpenGL single document, multiple documents and visualization windows are created by using the classified idea in VC++ environment. PRT format data files of UG are converted to DXF format data files. Not only the conversion rate but also the conversion quality of different format data file are ensured by using the intermediate conversion format CGM and the problems of redundancy lines and view missing are prevented. DXF files are converted to 3DS files by 3DS MAX software. Controlling and redrawing of UG files in OpenGL are realized. The Object-oriented method is better than process-oriented program design method on the reliability and operability of procedure. The method has been applied in the virtual CNC milling system and provided a theoretical basis for the development of visualization system.
Motion Planning of Nonholonomic Systems with Tracking Control Lyapunov Function
Authors: Peng Yan , Liu Mei , Tang Zhi Jie , Xie Shao Rong , Luo Jun
Published: December 2010

A common approach to motion planning of robots and vehicles involves finding suitable trajectories for the positions of each configuration variable, and then using feedback to regulate the system to these trajectories. However, when the system has less actuator than dynamical degrees of freedom, it is not always possible to do this arbitrarily. In this paper a tracking control Lyapunov function (TCLF) is proposed to guarantee that the trajectory generation is convergent and executable under nonholonomic constraint, and the simulation result conducted on surface vehicle shows its effectiveness.
Education of Master of Engineering via Constructivist Perspective
Authors: Zhao Hong , Zhu Song , Li Lan
Published: December 2010

In the paper, the relationship between tutors and students, and relationship between instructing and learning have been studied on the basis of analyzing educational teaching characteristics of Master of Engineering. Constructing Teaching Methods fit to engineering master's teaching idea and teaching method and teaching media is an important security of promoting teaching quality and bringing up Master of Engineering.
A Novel Cyber Physical Systems Model
Authors: Liu Xiao Wu , Gao Zhong He , Yu Ji Guo
Published: December 2010

Cyber Physical Systems (CPS) is a new science to joint physical and computation together and it can be used in information technology, industry process control and other fields. But its model remains a new research field that needs to be explored. In this paper, we put forward a novel CPS model based on Cognitive Network (CN) and accomplished the combination of CPS and CN. The model was composed of four layers included physical layer, network layer, user layer and cross layer. We discussed every layer in our model in which the functions such as control, communication and so on were described. We also presented the feedback circle in cross layer detailedly. Finally, we explained the suggestion and future work briefly.
Review on Research and Progress of Corrosion Inhibitors
Authors: Zhao Xiao Dong , Yang Jie , Fan Xi Qiu
Published: December 2010

In this paper, research and progress of corrosion inhibitors are reviewed from the aspects of history, classification, inhibition mechanism, evaluation methods and development trend. It is of great theoretical significance and high social and economic value for development of new efficient and low toxicity corrosion inhibitor and deep research on the inhibition mechanism.
A Low Power Monitoring and Tracking System for Multi-Container Based on the Improved LEACH
Authors: Li Xiu Yun , Liang Shan , Pang Bei Bei , Ren Yan Jun
Published: December 2010

Containers are playing an increasingly important role in modern logistics industry and usually are transported by different means including railways, ships, air and trucks. During transporting, the goods' damage event occurs frequently owing to the changes of external forces applied to the containers. In view of this problem, a container monitor based on wireless sensor network is proposed in this paper, and the real-time monitoring and tracking of a single container have been realized. Furthermore, aiming at multi-container transported in train or ship, we proposed a low power monitoring scheme based on improved LEACH algorithm. Accordingly, the energy consumption has been cut down, and the life cycle of the whole monitoring system has been prolonged efficiently.
Experimental Study on Friction-Induced Vibration of Water-Lubricated Rubber Stern Bearing at Low Speed
Authors: Peng En Gao , Zheng Lin Liu , Tian Yu Zhong , Lan Fang
Published: December 2010

When the stern bearing is operating, friction-induced vibration occurs because of friction and has some potential danger. In vibration test, it discovers that the friction-induced vibration appears at low speed and the vibration has the nature of randomness. The vibration response is nonlinear and a negative correlation is found between vibration intensity and rotational frequency.
Vibro-Acoustic Coupling Analysis of Aero-Engine Combustion Chamber Model
Authors: Ai Yan Ting , Li Song Jin , Yin Bang Hui , Bai Shi Mo
Published: December 2010

The combustion instability is an important reason for fatigue failure of the vibro-acoustic coupling combustion chamber thin-walled structure. The vibro-acoustic coupling equations of closed cavity are derived; The vibro-acoustic coupling coefficient matrix is calculated, it indicates that couplings between the acoustic modes and the structure modes are strictly selective; The vibro-acoustic coupling characteristics of the finite length simply supported closed cylindrical space and the combustion chamber flame tube modals are studied with the finite element method, and the little effect of modal coupling on frequency value is founded; The vibro-acoustic coupling test validation of the combustion chamber flame tube model is completed, and the results show that both the structure modes of the flame tube and the acoustic modes have the phenomenon of weak coupling.
Product and Vendor Development Programme in Encouraging Supply Chain Management: A Case Study
Authors: Wan Mahmood Wan Hasrulnizzam , Rahman Mohd Nizam A. , Baba Md Deros , Ismail Ahmad Rasdan
Published: December 2010

This paper reviews the methods used by an automotive manufacturer in enhancing the Supply Chain Management (SCM) system through a setup termed as Product and Vendor Development Programme (PVD). PVD was developed to eliminate problems faced due to late delivery and poor quality of supplies and availability of supplies at the lowest possible costs. The paper explores the methodologies that have been employed by the PVD. Results overtime show that the PVD has improved the SCM system especially in the areas of quality and delivery services, other services and as well as cutting costs that manufacturers had to face due to problems that arose in the shortcomings of the supply services. The PVD has managed to promote the Localization Programme and has also been able to establish qualified vendors. Findings also establish that the PVD team is the key to the success for development of the PVD programme. The paper presents an original discussion about viewing PVD programme from a successful automotive manufacturer.
Parameters Influences during Biodiesel Production
Authors: Kovač Kralj Anita , Kralj Davorin
Published: December 2010

Bio-diesel is a clean burning alternative fuel, produced from domestic, renewable resources. Bio-diesel can be blended at any level with petroleum diesel to create a bio-diesel blend. It can be used in compression-ignition (diesel) engines with little or no modification. Bio-diesel is simple to use, biodegradable, non-toxic, and essentially free of sulphur and aromatics. This paper presents the two following identifiable topic areas as key themes: 1. preparation of an aqueous solution of sodium hydroxide – as a catalyst, which can be activated by the most MeO- active groups, and can therefore be converted to methyl esters (biodiesel) from triglyceride. Methoxide (MeO-) was produced from sodium hydroxide (NaOH) and methanol (MeOH) in a batch reactor: NaOH + MeOH = H2O + Na+ + MeO-. During bio-diesel production, methoxide is incorrectly referred to as the product of mixing methanol and sodium hydroxide. An aqueous solution of sodium hydroxide – was prepared as a catalyst, by using different amounts of water at the same temperature. The reaction with lower water took place at the highest and quickest degrees of NaOH conversion and thus more MeO- active groups. The water was effective as an inhibitor.
Effect of Particle Size on Structure and Dielectric Properties of 0-3 PMN/EP Composite
Authors: Shi Min Xian , Huang Zhi Xiong , Qin Yan , He Hui Min
Published: December 2010

0-3 PMN/EP composites were prepared with different PMN particle size of powder A(100~154μm), B(74~100μm), C(66~74μm), D(45~66μm) , E(7~35μm) and F(0.15~18μm) by resin casting method. Particle size has great effect on property of PMN/EP composite. SEM analysis indicates that PMN particles with small size dispersed more uniformly in epoxy resin. The dielectric constant and dielectric loss of 0.1PMN/0.9EP and 0.3PMN/0.7EP composites vary a little with the particle size increasing, but dielectric constant and dielectric loss of 0.4PMN/0.6EP increase rapidly. Dielectric frequency characteristics analysis suggest that the variation trend of dielectric constant with different particle size at frequency of 103～106 Hz are almost similar in 0.3 PMN/0.7EP composites, but the dielectric constant of 0.4PMN/0.6EP composite with larger particle size drops remarkably with the frequency increase.
Study on Isolation Monitoring of High-Voltage Battery System
Authors: Piao Chang Hao , Cong Teng
Published: December 2010

After comparing the pros and cons of various isolation monitoring methods, this article presents the isolation monitoring method which based on unbalanced bridge and the characteristics of high-voltage battery system. Battery is an important component for Hybird-electric vehicle. The safety of high-voltage battery system is important specification for Hybird-electric vehicle. This device which uses Freescale’s 16-bit microcontroller with CAN communications capabilities achieve real-time and accurate measurement of isolation resistance of high-voltage battery system. The article focuses on the working principle of the device, hardware design and software design. This device has high accuracy, real-time, reliability and good working environment adaptability. The measuring accuracy meets the requirement of actual project.
Simulation on Observe Compensation Control for Electric Disturbances in CNC Servo System
Authors: Zhao Guo Yong , Zhao Yu Gang
Published: December 2010

The various disturbances destroy CNC system tracking accuracy greatly. The ideal servo system should obtain high system precision and machining precision even if under disturbances action. The influence of electric disturbances to CNC servo system is researched in detail. Moreover, the electric disturbances on the electric interface of servo system driver elements are observed, and the observe compensation quantity is added to the position controller output. The simulations aimed at saw-tooth wave electric disturbance signal show that the developed approach can reduce tracking error and enhance the restrain disturbance characteristic.
Study of the On-Line Monitoring on the Effect of Laser Shock Processing for Residual Stress by the Properties of Acoustic Wave
Authors: Li Yang , Qin Hai Yong
Published: December 2010

In order to realize the on-line monitoring of the effect of laser shock processing(LSP),acoustic waves generated during the LSP of 45 steel are measured in real time by a wide-band microphone and digitized at a sampling frequency of 48KHz.The waveforms of the received acoustic signal imported to MATLAB are analyzed and in order to investigate the frequency characteristic of the acoustic wave, a power spectral density(PSD) analysis has been carried out. Based on the value of the largest peak of the PSD and compressive residual stress of metal materials induced by the laser shock processing, the correlation equation was established with the application of least square method for the on-line monitoring.
Improving the Accuracy of Robot-Based Measuring System by Calibrating Laser-Stripe Scanner Model and Hand-to-Scanner Transformation
Authors: Li Ai Guo , Wu Xiang , Wu De Feng , Wang Wen Biao
Published: December 2010

This paper focuses on the system for object inspection by use of a laser stripe scanner and an industrial robot. In order to ensure the precision of the scanning system, a one-stage calibration method is proposed. This scheme mainly utilizes a circular-marked board as calibration target and calibrated the scanner model and hand-to-scanner transformation simultaneously using the same reference points. Therefore the influences of the scanner calibration error on the hand-to-scanner calibration can be eliminated naturedly. Finally, some experimental results are reported and analyzed.
A Trading Practice Based Trust Evaluation Model in Dynamic Virtual Enterprise
Authors: Jiang Jian Hua , Sheng Bu Yun , Yang Ming Zhong
Published: December 2010

In allusion to the trust evaluation of partner in Dynamic Virtual Enterprise, a trading practice based trust evaluation model was constructed. The trust evaluation process was divided into real-time feedback information based evaluation, trading history based evaluation and comprehensive evaluation, and the computing methods of every process were put forward. In trading history based evaluation, the relative between the weight of every trading and its trading time was researched. A correction factor of evaluation value was introduced in the process of comprehensive evaluation to reduce the influence of subjective factors in feedback information. Through the research and analysis of simulate experiment, the feasibility and the rationality of this trust evaluation model was verified.
Optimal Design for Heavy Forging Robot Grippers
Authors: Li Qun Ming , Qin Qing Hua , Zhang Shi Wei , Deng Hua
Published: December 2010

This paper analyzes three typical mechanisms of heavy forging robot grippers: pulling with a sliding block including short- and long-leveraged grippers and pushing leveraged grippers, and uses multi-objective evolutionary genetic algorithm to design the optimal forging robot grippers. The decision variables are defined according to the geometrical dimensions of the heavy grippers, and four objective functions are defined according to gripping forces and force transmission relationships between the joints, and the constraints are yielded by the physical conditions and the structure of the grippers. Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II) is used to solve the optimization problem. Normalized weighting objective functions are used to select the best optimal solution from Pareto optimal fronts. The Pareto fronts and optimal results are compared and analyzed. An optimal model of forging robot gripper is designed. The results show the effectiveness of the optimal design. Based on similarity theory, optimum dimensions from small scale forging grippers to large scale ones can be designed, and from model to prototype experiment to test the physical features is possible.
Experiment and Simulation of Influence of Welding Parameters on Temperature in Friction Stir Welding
Authors: Wang Lei , Zhu Jian Jun
Published: December 2010

Temperature distribution is the foundation to study friction stir welding technique, influence of welding parameters on temperature was studied through experiment measurement on AA2024-T4 aluminum alloy plates. An instantaneous relative linear velocity based heat source was utilized to build the FEM model of friction stir welding process, good agreement was observed between the measured and simulated thermal profiles. FEM model was also utilized to study effect of welding parameters on temperature distribution.
Study of Improving Precision of Nonlinear Gear System with Clearance Using Numerical Approximation
Authors: Chen Nai Chao , He Ping
Published: December 2010

The numerical approximation is proposed to explore the effective improvement of precision of position and velocity requirement in the mechanical transmission which hold the nonlinear gear system with clearance unit. The transfer function is adopted to compare the difference between the ideal model and model with the nonlinear gear system. The characteristics of the model with nonlinear gear system are detected by calculating the various parametric coefficients in the model. And then the numerical database is constructed to conveniently display the system performances, which also offers the plausible method to obtain optimum parametric coefficients using the numerical approximation. The tolerance equation between the approximate function and ideal function is set an objective function. The most optimum parameter can be obtained from the objective function by the optimization theory. The results show that these calculated optimum parametric coefficients can achieve the system stability, and improve the synthesis performance of control system. The proposed method in this study avoids to seeking for the approach to analyze the complex nonlinear system or build new control scheme, which is liable to use in the practical application. The simulative results demonstrate the effectiveness of the proposed method.
Critical Success Factors of Re-Engineering in the Production Process: SMEs Sector of Bangladesh
Authors: Shariful Alam Md. , Rajib Salah Uddin , Arefin Md. Shamsul
Published: December 2010

During the age of globalization, change has become a general phenomenon of business environment. Managements are compelled to adapt with the change to survive. Reengineering concept rises to adapt with the changes in terms of business process. However, critics raised questions as a number of business process reengineering initiatives failed and such failures have raised a doubt about the fad of reengineering. As a result, current researches are tempted to deal with the object orientation to find out the optimum way of successful implantation of re-engineering. This paper deals with the determination of critical success factors (CSFs) of re-engineering in the production process of the small and medium sized (SMEs) manufacturing enterprises of a developing country, Bangladesh. Determinants have been identified empirically through the survey conducted in the SMEs sector of Bangladesh.
Application of Physics of Failure Method in Reliability Design of Electronic Products
Authors: Shao Jiang , Zeng Cheng Hui , Li Yong Hong
Published: December 2010

Based on reliability theory on physics of failure, reliability information of electronic products is predicted by modeling and simulation methods. Various engineering analysis techniques are utilized and the product’s reliability is analyzed and designed. Analysis results on an electronic product example show that physics of failure method can find week problems of reliability design, advance prevention measures, mend the design to eliminate potential faults, thus improve the inherent reliability of electronic product ultimately.
Modeling and Kinematics Simulation of HT-CVT Based on Virtual Prototype Technology
Authors: Zhang Qing Gong , Li Hua , Yao Jin
Published: December 2010

The three-dimensional model of a Half Toroidal Continuously Variable Transmission (HT-CVT) was established by CAXA solid design. The kinematics simulation of the HT-CVT was realized by replacing the traction drive of elasto-hydrodynamic lubrication (EHL) oil film with the contact constraint joints in ADAMS. The angular velocity curves of the power rollers and the output cone disk on the HT-CVT were obtained. Simulation results demonstrate the fluctuation of the angular velocities on the two power rollers and the output cone disk compares well with the conclusion derived from the actual gear ratio of the HT-CVT.
Manufacturing Method of PM Components with Integrated Information Storage
Authors: Behrens Bernd-Arno , Vahed Najmeh , Gastan Edin , Lange Fabian
Published: December 2010

This paper presents a research work within Collaborative Research Centre 653 “Gentelligent Components in Their Lifecycle”. The term “gentelligent” refers to the genetic and intelligent character of these components. Specific data are inherently saved in the components which are used during its lifecycle for the means of identification, processing and reproduction. The presented study aims for the development of a method to manufacture and utilize gentelligent sintered parts. As data carrier, foreign materials shaped in fonts, logos or codes, are embedded in the powder material proceeded by pressing and sintering processes. The foreign material can be applied in forms of particles or compound powder. The information read-out is based on radiographic methods. The objectives of the investigations are the determination of the process parameters of each method and the impact of the integrated foreign materials on the mechanical properties of the component. The experimental studies are supported by numerical simulations.
Three-Dimensional Finite Element Modeling and Front Crash Process Analysis of Car Bodywork
Authors: Guo Li Xin , Gong Jie , Li Jin Li
Published: December 2010

Traffic accidents cause to a large quantity of personnel casualty and economic loss every year. The safety in vehicle crash has been one of important criterions in vehicle design. In this study a three-dimensional finite element model was established and the front crash process of car bodywork was analyzed. The simulation results show that the structure design of car bodywork is reasonable and of safety for the passengers. The investigation of this study not only validates the rationality of the car bodywork design but also provides a detailed numerical simulation model for further investigation as well as improvement and optimization of the car bodywork structure.
Development of Numerical Method for Prediction of Maneuvering Performance of Marine Vehicle
Authors: Yue Lei , Feng Da Kui , Zhang Zhi Guo , Lu Jing Guo , Zhang Shuai
Published: December 2010

Numerical maneuvering tank (NMT) is developed which could be used for investigating the flow physics involving the interaction of the flow shed from the sail and the cross-flow boundary layer of the hull, interaction between the hull and appendages like rudder and propeller during maneuvering operation. Two numerical codes are used for this study: CADMV (computer aid design of marine vehicle) and FLUENT commercial code. They are validated against each other and compared with experimental measurement results. Pressure coefficient and skin friction coefficient are obtained and compared with experimental data available in the literature. The simulation results show good agreement with the experimental data. NMT was developed based on above numerical method to simulate the circular motion of marine vehicle. The steady, uniform flow fields are obtained and the characteristics of rotation flow show good agreement with actual phenomena. The circular motion simulations of a SUBOFF in NMT is conducted at different angle of drifts of hull. The obtaining of hydrodynamics parameters is very important for accurately predicting the hydrodynamic behavior of a maneuvering marine vehicle in turning motion.
Modeling and Predicting Roughness of the Abrasive Jet Finishing with Grinding Wheel as Restraint
Authors: Hou Ya Li , Li Chang He , Ding Yu Cheng
Published: December 2010

Based on the modeling and experiments concerning the surface roughness in abrasive jet finishing with grinding wheel as restraint, the effect of abrasive size, abrasive fluid concentration, machining cycles, wheel velocity and carrier fluid on machined surface quality was investigated. Surface grinder M7120 was employed in a jet machining experiment conducted with W18Cr4V and 40Cr materials, profilometer TALYSURF was used to measure the micro geometrical parameters after machining, and SEM was used to observe surface micro-morphology. Experimental results show that with W7 Al2O3 powder at the mass fraction of 10% and antirust lubricating liquid being adopted in jet machining for 20 to 30 cycles, not only high surface shape precision can be kept or obtained, but also defect-free machined surface with the roughness of Ra0.15～1.6µm can be obtained with high efficiency. Experimental observation and experimental results proved that the experimental results agree well with a mechanism-based machining model.