bluuebunny/crossref_metadata_2025 huggingface dataset:
A Collaborative Replication Approach for Mobile-P2P Networks
Authors: Mondal Anirban , Kumar Madria Sanjay , Kitsuregawa Masaru
Published: June 2010

This paper proposes CADRE (Collaborative Allocation and De-allocation of Replicas with Efficiency), which is a dynamic replication scheme for improving the typically low data availability in dedicated and cooperative mobile ad-hoc peer-to-peer (M-P2P) networks. In particular, replica allocation and de-allocation are collaboratively performed in tandem to facilitate effective replication. Such collaboration is facilitated by a hybrid super-peer architecture in which some of the mobile hosts act as the ‘gateway nodes’ (GNs) in a given region. GNs facilitate both search and replication. The main contributions of CADRE are as follows. First, it facilitates the prevention of ‘thrashing’ conditions due to its collaborative replica allocation and de-allocation mechanism. Second, it considers the replication of images at different resolutions to optimize the usage of the generally limited memory space of the mobile hosts (MHs). Third, it addresses fair replica allocation across the MHs. Fourth, it facilitates the optimization of the limited energy resources of MHs during replication. The authors’ performance evaluation demonstrates that CADRE is indeed effective in improving data availability in M-P2P networks with significant reduction in query response times and low communication traffic during replication as compared to a recent existing scheme as well as a baseline approach, which does not consider any replication.
Using ICT to Integrate Smallholder Farmers into Agricultural Value Chain
Authors: Okello Julius J. , Ofwona-Adera Edith , Mbatia Oliver L.E. , Okello Ruth M.
Published: June 2010

This article examines an ICT-based intervention (known as the DrumNet project) that has succeeded in integrating smallholder-resource and poor farmers into a higher value agricultural chain. The article assesses the design of the project, and how it resolves the smallholder farmers’ idiosyncratic market failures and examines member-farmers’ marketing margins. The article finds that the design of the DrumNet project resolves smallholder farmers’ credit, insurance and information market failures and enables them to overcome organizational failure. The article concludes that successful ICT-based interventions for integrating farmers into higher value agricultural value chains require an integrated approach to tackling smallholder farmers’ constraints. The findings have implications for the design of future ICT-based interventions in agriculture.
Digital Divide in India
Authors: Singh Sumanjeet
Published: June 2010

Existing studies of the digital divide reveals the gap that exists between those who have access to ICTs and those who do not create exclusion, endanger social integration and hamper economic growth. The digital divide has many dimensions and can be categorized as global, regional and national. At national level, there is no single divide, but multiple divides: for instance, within countries, between men and women, young and elderly, rich and poor and most importantly rural and urban. The present paper is mainly focused on India and tries to explore the problem of digital divide mainly in rural-urban India. In the context of the present paper digital divide essentially means tele-density, mobile and Internet divide between the rural and urban areas. In this paper, the author reveals that obstacles such as illiteracy, lack of skills, infrastructures, and investment in rural areas must be tackled if India is to diminish the gap of the digital divide. The government should work toward connectivity provision, content creation, capacity augmentation, core technologies creation and exploitation, cost reduction, competence building, community participation and commitment to the deprived and disadvantaged to bridge the digital divide.
Implementation of Discrete and Integrated IT
Authors: Burns Colm , Hewitt-Dundas Nola
Published: June 2010

Integrated organisational IT systems, such as enterprise resource planning (ERP), supply chain management (SCM) and digital manufacturing (DM), have promised and delivered substantial performance benefits to many adopting firms. However, implementations of such systems have tended to be problematic. ERP projects, in particular, are prone to cost and time overruns, not delivering anticipated benefits and often being abandoned before completion. While research has developed around IT implementation, this has focused mainly on standalone (or discrete), as opposed to integrated, IT systems. Within this literature, organisational (i.e., structural and cultural) characteristics have been found to influence implementation success. The key aims of this research are (a) to investigate the role of organisational characteristics in determining IT implementation success; (b) to determine whether their influence differs for integrated IT and discrete IT projects; and (c) to develop specific guidelines for managers of integrated IT implementations. An in-depth comparative case study of two IT projects was conducted within a major aerospace manufacturing company.
A CASE Tool for Java Mobile Computing Applications
Authors: Christou Ioannis T. , Efremidis Sofoklis , Roukounaki Aikaterini
Published: June 2010

The market for applications developed for mobile devices is growing as the hardware capabilities increase while costs drop. At the same time, the inability to write code once becomes a noticeable problem resulting in the time consuming task of porting an application to a variety of mobile devices, which is true for languages like Java that have been designed to be portable across a range of hardware platforms. As a result, porting a Java application written for one device to another is often a tedious and time-consuming task for developers. This paper presents an intelligent CASE tool that assists the porting of Java mobile applications by automatically generating Java code fragments for the target SDK. SeqFinder automatically generates all minimal method invocation sequences that lead to an object of a specific type, thus relieving the programmer of manually searching the manufacturer-provided SDK Java archives. However, this tool is not applicable only to the Java ME platform and has been used as a fast type-browser for J2SE/J2EE applications.
On Uplink Channel Estimation in WiMAX Systems
Authors: Shen Yushi , Cosman Pamela C. , Milstein Laurence B. , Martinez Eduardo F.
Published: June 2010

In this paper, channel estimation algorithms are proposed and compared for uplink WiMAX systems, which are OFDMA based. These algorithms are investigated based on a dynamic resource allocation scheme, and it is shown that each of them is suitable to specific system scenarios. For example, for a system with a bandwidth of 10MHz operating in the low frequency region (2-11GHz), a two-dimensional averaging algorithm outperforms other algorithms, such as a bilinear interpolation algorithm, because the correlations between the pilots and signals are sufficiently high in both the frequency and the time dimensions.
Ontology Instance Matching based MPEG-7 Resource Integration
Authors: Seddiqui Hanif , Aono Masaki
Published: June 2010

Heterogeneous multimedia contents are annotated by a sharable formal conceptualization, often called ontology, and these contents, regardless of their media, become sharable resources/instances. Integration of the sharable resources and acquisition of diverse knowledge is getting researchers’ attention at a rapid pace. In this regard, MPEG-7 standard convertible to semantic Resource Description Framework (RDF) evolves for containing structured data and knowledge sources. In this paper, the authors propose an efficient approach to integrate the multimedia resources annotated by the standard of MPEG-7 schema using ontology instance matching techniques. MPEG-7 resources are usually specified explicitly by their surrounding MPEG-7 schema entities, e.g., concepts and properties, in conjunction with other linked resources. Therefore, resource integration needed schema matching as well. In this approach, the authors obtained the schema matching using their scalable ontology alignment algorithm and collected the semantically linked resources, referred to as the Semantic Link Cloud (SLC) collectively for each of the resources. Techniques were addressed to solve several data heterogeneity: value transformation, structural transformation and logical transformation. These experiments show the strength and efficiency of the proposed matching approach.
Service Composition Based Software Solution Design
Authors: Mo Tong , Xu Jingmin , Wang Zhongjie , Ma Yufei , Huang Heyuan , Wang Yuan , Liu Ying , Zhu Jun , Xu Xiaofei
Published: June 2010

Service composition and Web mash-up are promising for meeting specific business requirements by integrating multiple distributed services and SaaS (Software as a Service) has become a popular way of software development and delivery paradigm. An application that meets the business challenges the customer faces in managing its supply chain by integrating two existing SaaS offerings into a newly developed technology presented to validate the service composition technologies. This paper contributes with a practice of a light weight approach of the problems that are inevitable in SaaS integration such as data synchronization, process control, and identification. The purpose of this paper tries to provide a reference for researchers and engineers in this domain.
Supermarket Service Modeling and Evaluation
Authors: Bao Dihui , Chen Yelu , Sun Huiping , Chen Zhong
Published: June 2010

Supermarkets face the problems of customer queuing and SCM optimizing. Even a series of supermarket service models are adopted currently; however, these issues still exist. This paper examines the framework of this popular service and proposes a quantitive supermarket service metric for evaluation. It introduces three existing supermarket service models and propounds a new hybrid model on the point of improvement which is an integration of e-supermarket and typical model, concentrating on self-service and automated service. The paper gives detailed analysis and comparisons based on Game Theory and simulated experiment by expressions separately for customer, supermarket and supplier and proves the superior feature of the hybrid model. It also suggests a feasible solution using RFID and explains the solution to the biggest challenge about backend bottleneck.
Analysis of the Strain and Stress Fields of Cardboard Box during Compression by 3D Digital Image Correlation
Authors: Viguié Jeremie , Dumont P.J.J. , Vacher P. , Orgéas Laurent , Desloges I. , Mauret E.
Published: June 2010

Corrugated boards with small flutes appear as good alternatives to replace packaging folding boards or plastic materials due their small thickness, possibility of easy recycling and biodegradability. Boxes made up of these materials have to withstand significant compressive loading conditions during transport and storage. In order to evaluate their structural performance, the box compression test is the most currently performed experiment. It consists in compressing an empty container between two parallel plates at constant velocity. Usually it is observed that buckling phenomena are localized in the box panels, which bulge out during compression [1]. At the maximum recorded compression force, the deformation localises around the box corners where creases nucleate and propagate. This maximum force is defined as the quasi-static compression strength of the box. The prediction of such strength is the main topic of interest of past and current research works. For example, the box compression behaviour of boxes was studied by Mc Kee et al. [2] and Urbanik [3], who defined semi-empirical formula to predict the box compression strength, as well as by Beldie et al. [4] and Biancolini et al. [5] by finite element simulations. But comparisons of these models with experimental results remain rather scarce and limited.
A Laser Speckle Method for Measuring Displacement Field. Application to Resistance Heating Tensile Test on Steel
Authors: Pradille Christophe , Bellet Michel , Chastel Yvan
Published: June 2010

Strain field measurement with non intrusive techniques is needed in order to characterize the behaviour of steels at high temperatures subjected to small displacements. In this work we present a technique based on laser-produced speckles coupled with a cross-correlation cross-spectrum method. This method proves more accurate than cross-correlation for small displacements. The laser wave length used (532 nm) allows to perform strain measurements, even with heat radiation.
From the Inside, Out Use of Optical Measuring Techniques for Wind Turbine Development
Authors: Stanley A. , Klein Markus
Published: June 2010

Current trends in the wind turbine industry demand that manufacturers and related research facilities increase development efficiency whilst minimizing production costs. A key component developed is the blade, which needs to efficiently capture the wind energy whilst being able to survive severe weather conditions. More recently larger blades have been used, where main advantages include an increase in wind capture efficiency, a reduction in the installation and reduction in maintenance costs per MW. This paper outlines the main principles behind optical measurement techniques employed, influencing factors for using this technology, and presents the importance of the results achieved thus far and describes ongoing development activities.
The Effect of Ultrasonic Excitation in Metal Forming Tests
Authors: Abdul Aziz S. , Lucas Margaret
Published: June 2010

The use of ultrasonic excitation of tools and dies in metal forming operations has been the subject of ongoing research for many years. However, the lack of understanding about the effects of ultrasonic vibrations on the forming process has resulted in difficulties in maximising the benefits and applications of this technology. In particular, experimental characterisations of the effects of superimposing ultrasonic oscillations have largely relied on interpretations of measurements of the mean forming load and have ignored the oscillatory forces. Previous research [1] has shown that by applying ultrasonic vibrations to the lower platen in compression tests on pure aluminium specimens, the resulting stress-strain relationship can be characterised by a temporary effective softening of the material during intervals of ultrasonic excitation. The current research investigates this effect in a series of simple forming tests using a number of different metal specimens. In this research, the forming tests are conducted using a piezoelectric force transducer to measure the oscillatory force data during ultrasonic excitation of the die. It is shown that the benefits of superimposing ultrasonic excitation of the die are highly dependent on the material being formed and that, in many cases, the maximum oscillatory force exceeds the static forming load even where the mean forming load is reduced significantly during the interval of ultrasonic excitation.
Modeling of Coating Stress of Plasma-Sprayed Thermal Barrier Coatings
Authors: Arai Masayuki
Published: June 2010

The surfaces of gas turbine components are coated with thermal barrier coatings (TBCs) using a plasma spraying technique. A lot of effort has been expended examining the TBC interfacial strength, however studies examining how residual stress is formed after the process and how the coating stress changes with temperature are limited. In this report, the residual stress prediction model is proposed based on the splat deposition process. A simplified model including the plasma sprayed process is developed based on shear-lag theory. The simplification is given in continuous particle deposition process. That is, continuous particle deposited coating is modeled as a single layer, which is called by "deposition layer". This deposition layer is assumed to impact directly onto the substrate. The binding layer is also introduced to express multiple cracks caused by quenching stress in splats and sliding deformation at splat boundary. It is shown that the numerical analysis has good agreement with the associated experiments.
Construction of Shape Features for the Representation of Full-Field Displacement/Strain Data
Authors: Wang Wei Zhuo , Mottershead John E. , Patki Amol , Patterson Eann A
Published: June 2010

The achievement of high levels of confidence in finite element models involves their validation using measured responses such as static strains or vibration mode shapes. A huge amount of data with a high level of information redundancy is usually obtained in both the detailed finite element prediction and the full-field measurements so that achieving a meaningful validation becomes a challenging problem. In order to extract useful shape features from such data, image processing and pattern recognition techniques may be used. One of the most commonly adopted shape feature extraction procedures is the Fourier transform in which the original data may be expressed as a set of coefficients (coordinates) of the decomposition kernels (bases) in the feature space. Localised effects can be detected by the wavelet transform. The acquired shape features are succinct and therefore simplify the model validation, based on the full-field data, allowing it to be achieved in a more effective and efficient way. In this paper, full-field finite element strain patterns of a plate with a centred circular hole are considered. A special set of orthonormal shape decomposition kernels based on the circular Zernike polynomials are constructed by the Gram-Schmidt orthonormalization process. It is found that the strain patterns can suitably be represented by only a very small number of shape features from the derived kernels.
Assessment of Quasi-Static and Fatigue Loaded Notched GRP Laminates Using Digital Image Correlation
Authors: Broughton W.R. , Gower Michael R.L. , Lodeiro Maria J. , Pilkington Gordon D. , Shaw Richard M.
Published: June 2010

This paper presents the results of an experimental study carried out to assess the effects of cumulative damage on the strain response of open-hole (notched) quasi-isotropic [45/0/-45/90]4s E-glass/913 epoxy laminate specimens under quasi-static tension, and constant amplitude tension-tension, compression-compression and tension-compression cyclic loading conditions. In-plane surface strain was measured as a function of applied load and loading cycles for quasi-static and cyclic loading respectively using digital image correlation (DIC) and compared with strain gauge, fibre Bragg grating (FBG) optical sensor and contact extensometer strain measurements. DIC proved successful in monitoring local (near the hole) and global strains, providing critical information on the changes in strain distribution resulting from damage formation and growth incurred.
The Role of Experimental Stress Analysis at Graduation and Post Graduation Courses - A Brazilian Case
Authors: Miranda R.J.P.C. , Domingues Pedro , Zamboni L.M. , Salamani J.C.
Published: June 2010

This paper presents an alternative to the theoretical classic teaching methods generally used in Strength of Materials or Solids Mechanics. It introduces a dynamic and interactive process, with emphasis in the use of ESA-Experimental Stress Analysis, especially strain gauges and photo-elasticity. In addition to the didactic and practical experiments, the students used all their energy and creativity to develop the interesting results presented here, such as, experimental device for measuring displacement, Buckling, Spaghetti and Popsicle sticks Bridges, Stress analysis in a cylinder block and Mini Baja project.
Study of Wheat Straw Veneer on Weave Process
Authors: Liu Bing , Wang Feng Hu , Jiao An Ying , Sun Jian Ping , Zhu Xiao Dong
Published: June 2010

The wheat straw was pretreated using heat-treatment and water action and then diversified flat weave experiments were performed. Effects of the technology of knitting (including machinery spinning method, sewing spelling method, weaving process of "picks one pressures one" and "picks two pressures two") on veneer material quality and technology of decorative facing was investigated. The results show that both of sewing spelling method and weaving process of "pick two pressure two" achieve better effect with close construction, level, nice appearance and simple to weave. Experiments for optimizing the technology were performed by using non-woven fabric as the laminated veneer materials, The optimal technical parameters when using non-woven fabric were as follows: MDI 1.5％ and UF 8％ with the dosage of 50-80g/m2; temperature of 85-105°C; pressure of 0.2-0.5 MPa; time of 25min(10 sheet at a time).
Research on Dynamic Data Streams Clustering Algorithm –Pdstream Based on PCA and Density
Authors: Zheng Mei , Ju Chun Hua , Rui Zhang
Published: June 2010

The research on data streams clustering has become a focus in the field of data streams mining. Because the number of data streams is too large, and CPU of the computer has limited memory and time, it’s difficult to carry out clustering quickly and effectively. For that problem, we design an improved clustering algorithm for dynamic data streams based on principal component analysis and density. The PDStream algorithm effectively overcomes the shortcomings of the STREAM algorithm controlled by historical data and the CluStream algorithm is difficult to describe non-spherical and out "old data", resulting in huge amount of data. In the course of the experiment, we compare with the STREAM algorithm, the PDStream algorithm shows the superiority of handling mass data and the characteristics of high-quality clustering.
Piezoelectric Battery Design to Harvest Ambient Vibration Energy for Wireless Sensor Nodes
Authors: Du Xiao Zhen , Yu Hong
Published: June 2010

This paper presents a theory model based on the vibration and piezoelectric coupling mechanism. The aim is to discuss the optimization parameters for the design of a piezoelectric battery. The simulation results show the dependence of output power on external load and the device structure. High output power can be obtained by optimizing the piezoelectric battery structure parameters. Theory analysis and indicate that a piezoelectric battery for ambient vibration energy harvesting is a promising electric power source for wireless sensors nodes.
Evolution Pattern Discovery and Case Study of Logistics Companies Based on Time Series Analysis
Authors: Yang Bin , Wu Xian Bing , Hu Zhi Hua
Published: June 2010

Accurate demand forecasts are critical for logistics enterprises to improve the efficiency of their resource usage. Demand forecasts of logistics enterprises are closely related to the overall social environment, local economic development, related industries development, seasonal demand change, and the development of the enterprises. Therefore, a direct analytical model is difficult to obtain. Based on the analysis of the historical data of a typical shipping company, this paper presents a time series prediction model for logistics enterprises in the goods traffic forecasts, and through experimental analysis and comparison study, it found that the method proposed in this paper has higher prediction accuracy. Thus, the proposed model can be used to forecast the demand of the freight transport companies and has a spread value.
Maximal Frequent Itemsets in Data Stream Mining Based on Orderly-Compound Policy
Authors: Chen Pei Shuai , Xu Chong Huan
Published: June 2010

Mining maximal frequent itemsets get the advantage of a relatively small number of itemsets. Compared to mining frequent itemsets and mining frequent closed itemsets, such algorithm has higher time and space efficiency. According to the features of data streams and combined sliding window, a new algorithm E-FPMFI which is based on orderly-compound policy for mining maximal frequent itemsets in data stream is proposed. The algorithm based on basic window updates information from data stream flow fragment and scans the stream only once to gain and store it in frequent itemsets list. The algorithm construct FP-tree, then compress orderly FP-tree by merging nodes which has equal minsup in same branch, also uses subset mix pruning technique, avoid superset checking. The experimental results show the algorithm has higher time, space efficiency and good scalability.
The Basic Study of Dynamic Walking Aids Based on Gait Stability
Authors: Zhang Jun Xia , Wang Ze , Zhang Yun Yun
Published: June 2010

Aiming at the present gait instable walking-aid, a low cost walking-aid research platform is designed in this paper. The paper developed a dynamic walking aids mechanical design process which based on the study of body's gait stability and motion parameters, analyzed the structural design of the walking aids in ergonomic principles. Furthermore, based on the ZMP gait stability theory, adopting a composed design/integrated optimization gait planning method to program the gait of normal walkers and wearers. Adjusting the ankle joint to the rear foot and the trajectory of the hip’ abscissa is integrated to modify the actual ZMP trajectory to the ideal ZMP trajectory. The proposed composed design/integrated optimization method greatly simplifies the programming process and provides a good experiment platform for walking aid teaching and scientific research.
Quality Management Mode and Process in Concurrent Engineering
Authors: Tian Jin , Zhao Ting Di
Published: June 2010

The problems of quality management (QM) in traditional consecutive development were analyzed, and it was pointed out that there were essential differences between QM in concurrent development mode and that in consecutive development mode. One was modification or change in work process, and the other was cooperation within Integrated Product Team (IPT) members aiming at product quality improvement. According to the characteristics of concurrent development, QM mode and process models appropriate to Concurrent Engineering (CE) were established. The models were able to demonstrate QM responsibility distribution, specific QM work patterns and flow, as well as quality information processing and transfer among the development phases. The models provided guidance and reference about how to enhance quality management of product development process.
Analyze and Design a New Type of Production Line
Authors: Zhang Mian Hao , Zhou Wu
Published: June 2010

Manufacturing companies today are looking for the new manufacturing methods.These companies are designing elaborate manufacturing systems in an attempt to meet market trend as well as diverse customer requirements.Recently these manufacturing systems have most often taken the form of Continuous Flow Manufacturing systems, which is represented by one long transfer line containing all relevant operations,or workstations,required to produce a given product.A transfer line of this type is quite susceptible to individual workstation performance,because a breakdown at any one of the workstation would cause the entire line to stop and production to cease. Due to the inherent advantages of Cellular Manufacturing to meet requirements customer, increase productivity, reduce costs,the Cellular Manufacturing can improve the effectiveness of most production line. This paper discusses the development and implementation of a combined production line that takes some its advantages from Continuous Flow Manufacturing and Cellular Manufacturing.
Three Dimensional Finite Element Analysis of Composite Laminates with Non-Penetrating Damage Repaired by Scarf Bonding Method
Authors: Liu Feng , Qin Wen Feng , Liu Guo Chun
Published: June 2010

The three dimensional finite element model of composite laminates made of carbon fiber reinforced bismaleimide resin is built, and the stress state of the composite laminates under unidirectional tensile force is analyzed. The strength criterion and damage mode are given based on the stresses of material principal direction. The three dimensional finite element model of the same laminates with non-penetrating damage repaired by scarf bonding method is built, and the stress state is also analyzed. The strength criterion and the damage mode of the scarf bonding composite laminates are also given. The strength and the damage mode of original laminates are compared with that of the laminates with non-penetrating damage. The influence of the interlaminar stress is considered in these analysis models. It is showed that the three dimensional models can simulate the geometric and physical features of the real composite laminates. It is concluded that the original composite laminates made of carbon fiber reinforced bismaleimide resin and the repaired one both damage first in the laminar whose second material principal direction coincides with the axial tensile force. And the damage mode is resin crack under tensile stress. The strength of the bonding patches is higher than the laminates repaired by scarf bonding. After scarf bonding repair, the strength of the damaged laminates can recover up to about eighty-four percent.
Assembly Sequence Planning Utilizing Chaotic Adaptive Ant Colony Optimization Algorithm
Authors: Wang Yong , De Tian , Liu Ji Hong
Published: June 2010

The chaotic adaptive ant colony optimization algorithm (CAACO) is proposed to seek the optimal or near-optimal assembly sequences of mechanical products. Different from the general AACO algorithm, the parameter denoting the global evaporation rate of the AACO algorithm is not specified by the designers, but is generated with the chaotic operators in the optimization process. An example is used to validate the capability of the CAACO algorithm, and the results show that the robustness of the CAACO algorithm is enhanced and more ants in the ant colony can find their own optimal or near-optimal assembly sequences than those of the general AACO algorithm.
The Judgement for M-Matrices in Signal Processing
Authors: Lin Ya Ning
Published: June 2010

Special matrices play an important role in matrix analysis and matrix computation more and more. So it can give improvements by great progress obtained in the researches on special matrices in computational mathematics. In this paper, motivated by [4], we give a simple and convenient judging method which can be used to judge whether an nonnegative real matrix A is a M-matrix or not.
Construction and Application of Evaluation Model for Efficient Operation of Supply Chain Systems
Authors: Wang Jin Li
Published: June 2010

Thesis firstly defines supply chain content, then learn from theory of supply chain factors to determine the effective operation of supply chain as objective, the effective interface, dynamic scalability and effective communication for guidelines. The subordinate indexes for effective interface are transportation, network construction, the quality of staff, subordinate indexes for dynamic scalability are the country's economic level, competition in the market environment, market information, the quality of decision-makers, subordinate indexes for effective communication are except market information, the quality of decision-making personnel, but also subjected to the two essential elements, state laws and regulations and commercial credit. Combined Analytic Hierarchy Process with expert method to give model evaluation results, that is the supply chain decision-makers, has a greatest effect on the effective functioning of the supply chain, followed by the commercial credit, once again, market information. Based on the evaluation model, put forward its scope and the corresponding strategies.
Self-Regulation PID-Fuzzy Controller for Flume System
Authors: Zhu Xi Zhi
Published: June 2010

Since complex industry object has characteristic of non-linearity, uncertainty and time-change, this paper studied about application of self-regulation PID-Fuzzy controller for flume system. The properties of the basic fuzzy controllers can be improved through compiling S-function and subsystem that automatically corrects the quantizing factors Ke and Kc. The proportional, integral and derivative constant adjusted by new rule of fuzzy to adapt with the extreme condition of process. Fuzzy control applies language rule to describe controlling process and bases rule to modify the controlling arithmetic and parameter. The new algorithm performs in every condition and already tested in every extreme condition. The simulation result shows that the controller possesses virtues of self-adaptability and short adjusting time. It will realize production process control.
Photoelectrocatalytic Degradation of Methyl Orange Using Suspended TiO2 and the Effects of Ammonium Salts
Authors: Xiao Xuan , Bai Jia Wei , Zhang Wen Jie , Li Yuan Di
Published: June 2010

Photoelectrocatalytic (PEC) degradation efficiencies of a suspended TiO2 and Ti electrodes composite system in different ammonium salt solutions were investigated. Electrolyte type and concentration as well as the applied potential on the Ti electrodes had significant effects on photoelectrocatalytic degradation and electro-degradation efficiencies. PEC degradation and electro-degradation of methyl orange increased with increasing applied potential and electrolyte concentration. PEC degradation is much more powerful than electro-degradation. PEC degradation efficiency in (NH4)3PO4•3H2O solution is the highest 93.4%, whereas the efficiency in NH4Cl solution shows the worst 73.1%, which is even less than that of photocatalytic process alone. PEC degradation efficiencies in (NH4)2SO4 and NH4HCO3 solutions are 88.8% and 85.9% respectively, indicating no noticeable improvement compared with photocatalytic process.
An Improved PBIL Algorithm for the Machine-Part Cell Formation
Authors: Wang Zhu , Zhang Qing Bin , Ma Yan Fang , Zhang Jing , Liu Yuan
Published: June 2010

The machine-part cell formation is a NP- complete combinational optimization problem. Past research has shown that although the genetic algorithm (GA) can get high quality solutions, special selection strategy, crossover and mutation operators as well as the parameters must be defined previously to solve the problem efficiently and flexibly. In this paper, an improved permutation code PBIL is adopted to solve the machine-part cell formation problem. Simulation results on five well known problems show that the PBIL can get satisfied solutions more simply and efficiently.
Robust Method for Separation of Noisy Biomedical Signals
Authors: Zhao Yong Jian , Liu Bio Qiang
Published: June 2010

Biomedical signals are a rich source of information about physiological processes, but they are often contaminated by noise. In order to separate biomedical signals from mixtures effectually, we propose a novel blind source extraction method via independent component analysis (ICA). The robustness with respect to noise of this method lies in two-fold: on the one hand, the method does not lead to biassed estimates and, on the other hand, it minimizes the amount of signal and noise interference on the estimated sources. Preliminary results tested with ECG signals have demonstrated that the proposed method may be promising for blindly separating biomedical signals in the presence of noise and further decompose the mixed signals into subcomponents.
Engineering Achievement and Application of Unascertained Clustering Decision Algorithm Based on MATLAB
Authors: Sun Shu Sheng , Wu Wei
Published: June 2010

Unascertained clustering is an unsupervised clustering based on unascertained set. It is a method to make soft division of objects which is more scientific and realistic than the general one. According to the basic idea of unascertained average clustering, we write a specific procedure to achieve calculation by the MATLAB technology and then we verify the feasibility and effectiveness of the written procedures as well as the practical value and feasibility of calculation through case study.
Analysis and Compensation Following Error of Feed Drive in CNC
Authors: Sheng Xian Jun , Wang Ke Xin , Kang Ren Ke , Wang Yong Qi
Published: June 2010

In CNC machining, the constant following error was caused by the uniform motion of feed drive, which could induced contour error in the multi-axis movement, and the contour error would affect machining accuracy. In this paper, the produce principle of following error is analyzed, as well as the influences of following error on contour of linear and circular interpolation. The following error was compensated by velocity feedforward controller, and a new method for identifying coefficient of velocity feedforward controller is presented, based on the actual observed values of following error. The following error was eliminated after compensating with the proposed method.
Preparation and Characterization of Nanosized Barium-Strontium Titanate Immobilized on Aluminum Oxide and Its Application in Adsorption
Authors: Zhang Dong , Zhang Chun Li
Published: June 2010

Nanometer barium-stroutium titanate immobilized on aluminum oxide (ABST) was prepared by the citric acid sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its Pb2+ and Cd2+ adsorption properties from water were studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer barium-strontium titanate was immobilized on aluminum oxide firmly, becoming a composite adsorbent. The lead and cadmium ions were quantitatively retained at pH 5-8; their adsorption capacities of ABST were 70.28 mg•g－1 and 8.12 mg•g－1, respectively. The adsorbent of adsorped lead and cadmium ions were regenerated completely by elution with 1 mol•L－1 HNO3. The adsorbent had a promising prospect in analyticl chemistry and water treatment.
Research on Fault Recognition for Centrifugal Compressor Based on Fuzzy Gray Relational Grade
Authors: Li Lan Yun , Yang Zhuan Zhao , He Zhi
Published: June 2010

In practical centrifugal compressor fault diagnosis, it is very difficult to improve the fault recognition rate, especially when the sample sizes are small. To solve this problem, a new fault recognition method based on fuzzy gray relational grade was proposed. Firstly, according to fuzzy set theory, the fuzzy relation coefficient (FRC), fuzzy relation degree (FRD) and fuzzy relative weights (FRW) of all fault features were calculated. Secondly, the gray system theory was used to obtain the gray relational coefficients (GRC). Thirdly, by combining FRW and GRC, two fuzzy gray relation grades (FGRG) were presented, which is the Hamming distance-based fuzzy gray relation grade (HD-FGRG) and the Euclidean distance-based fuzzy gray relation grade (ED-FGRG), respectively. Finally, the fault recognition results were obtained by using the max membership degree principle. The centrifugal compressor fault diagnosis results show that the ED-FGRG method is more effective and accurate than traditional gray relational analysis (T-GRA) method, the weighted gray relational analysis (W-GRA) method, and the entropy weight-based gray relational analysis (EW-GRA) method and the HD-FGRG method.
The Internal Connection Study of Graphics, Image and Virtual Realism
Authors: Zhang De Fa
Published: June 2010

With the development of times, industry has been making great progress, which varies from primitive manual labor to machines in the age of steam. Then, machines and factories have taken the place of more and more manual labors with the development of mechanical design and relative theory. However, it still fails to reach the stage of full automation. Owing to the birth of computer and development of artificial intelligence, the robot factory is no longer a fresh topic. Undoubtedly, those are linked with graphic and computer’s development. There must be a more advanced theory and technology coming into being as graphic & image reach a higher stage. Then, it was named as the virtual realism technology. This new technology has been widely applied to various fields, such as, automatic production line, air quality automatic detector, war-simulating in army, “simulating space environment” on the earth, virtual laboratories building in the education and etc.
Now, here are two basic concepts involved in the long-term development: graphics and image.
Performance Estimate for Design of Storage-Type Domestic Electrical Water-Heaters Based on the CFD Simulation
Authors: Zhang Zhi Jun , Zhang Shi Wei , Xu Cheng Hai
Published: June 2010

The 3D physical model of the electrical water heater was built. The water-heater performance of two kind structures was resolved by computer fluid dynamics simulation (CFD). The heater performance is characterized by a new method rather than that the discharge efficiency, extraction efficiency and fraction of heat recoverable. The new method is based on the constant discharge water temperature and rate for end user, 5L/min and 43°C that include the hot water from EWH and cold water from outside EWH. But the water discharge rate from EWH was variable as the water temperature discharge from EWH was variable. The discharge efficiency of conventional EWH was 79.312%, and the discharge efficiency of improved EWH was 84.97%. Compared with the traditional method, it is more close to the user using reality condition.
Influence of ZrO2 Nanoparticle as Additive on Tribological Property of Lithium Grease
Authors: Xia Xin Tao , Zhang Ya Ping , Zhang Yong Zhen , Chen Shi Chao
Published: June 2010

The experiment on the friction and wear of the lithium grease is done by choosing the ZrO2 nanoparticles as the additive in order to study the change of the tribological property of the lithium grease. The friction coefficient decreases by over 30% if the ZrO2 nanoparticles with the mass fractions of 0.25% and 0.5% are used as the additive. The ZrO2 nanoparticles with the mass fraction of 0.25% and 0.5% reach the best result and the wear scar diameter can decrease by 48.8% and 46.5%, respectively.
Study on Chip Morphology and Adiabatic Shear in High Speed Cutting of Alloy Steels with Different Hardness
Authors: Duan Chun Zheng , Li Hong Hua , Wang Min Jie , Cai Yu Jun
Published: June 2010

The chip morphology and the formation and development of the adiabatic shear band within the serrated chips formed in high speed cutting of 30CrNi3MoV steel with two tempering hardness were observed and analyzed using optical microscope and SEM. The investigation shows that as the adiabatic shear phenomenon occurs and develops, the chip morphology changes as follows: ribbon chip→serrated chip with deformed band→serrated chip with transformed band→fractured chip. The cutting speed and tempering hardness is the two main factors affecting adiabatic shear, in the case of lower cutting speed the formation and development of adiabatic shear band are more sensitive to tempered hardness increase. The deformed shear bands are constituted by large deformed
microstructure, while the formation of the transformed shear bands has experienced the large plastic deformation and grain refinement.
Structure Design and Kinematic Analysis on the Walking Mechanism of Forestry Walking Robot
Authors: Wang Hui , Ma Yan , Ren Chang Qing , Li Ning
Published: June 2010

It makes a brief description of the walking robot used in the forestry. The paper makes a deep analysis and founds a scheme on the walking mechanism of forestry walking robot, illustrates the relationship among the mechanism structure, component size, tracks and kinematic parameters of the foot. It makes an experimental prototype design which through the analysis before, embeds the scheme into the design parameters, and conducts an actual verification about the results of theoretical derivation. The results proved the feasibility of the design, and reflected the impact factors of the motion. It will lay the theoretical foundation for the walking mechanism’s design and research of the forestry walking robot, and will be in favor of the development and utilization of the forestry walking robot in the new period.
Vibration Control Using Shunted Electromagnetic Transducer
Authors: Cheng Tai Hong , Xuan Dong Ji , Li Zhen Zhe , Shen Yun De
Published: June 2010

This paper describes vibration suppression of the flexible cantilever beams using shunted electromagnetic transducer. The proposed system consists of a coil attached on a cantilever and a permanent magnet placed under the bottom of the coil, and both ends of the coil were connected to the parallel resonant RLC shunt circuit. The dynamic model of cantilever beam with shunted electromagnetic damper was theoretically formulated and used to compare the analytic predictions with the experimental results. The vibration and damping characteristics of the flexible beams with the electromagnetic shunt damper were investigated by tuning the circuit parameters. Also, the effect of the magnetic intensity on the shunt damping was studied with the variation of the gap between the aluminum beam and the permanent magnet. Presented results show that the electromagnet shunt damper has good vibration reduction effect, and it can be successfully applied to reduce the vibration of the flexible structures.
Application and Implementation of Monte Carlo Method in Mechanical Engineering
Authors: Chen Guo Qiang , Zhao Jun Wei
Published: June 2010

As a powerful tool for scientific research, Monte Carlo simulation has been utilized widely in mechanical engineering for a long time. The paper reviews the application in statistical tolerance analysis, reliability design and analysis, uncertainty analysis in mechanical measurement, robot error, position and attitude analysis, and optimum design. The implementation of Monte Carlo method is also discussed and classified into three types: using Monte Carlo simulation software directly, programming in the development environment with random number generator, and programming from the basic random number generation. Finally, the authors points out using Monte Carlo software directly is recommend because the engineer needn’t concern the detail of the complex computation and can pay more attention to the purpose of the mechanical application.
The Deformation Analysis about Guide Way Contact of Large Span and Heavy Load Cross-Rail
Authors: Zhao Yong Sheng , Dong Xue Jiao , Guo Tie Neng , Yang Wen Tong
Published: June 2010

The article used the large span and heavy load cross-rail of some machine tools plant’s heavy-type numerical control milling planer for research object, by using the finite element software to build the model and force analysis. It also researched the force distribution and deformation condition of the large span motion girder under the actual working condition. It considered the slide carriage superposition effect to build the describing method and establishing process of the large span load curve by contacting analysis and restraining analysis, and got the knifepoint trajectory deformation. The research provided the sufficient theory basis and simulation method for designing improvement of cross-rail structure and got a perfect arch in advance.
Correlation Analysis between Dynamic Young’s Modulus and Static MOE of the Poplar LVL Reinforced with Multilayer Fiberglass Mesh
Authors: Zhang Li , Hu Ying Cheng
Published: June 2010

In this paper, the poplar LVL was reinforced with multilayer fiberglass mesh. The reinforcing effect of adding position of fiberglass mesh on improving the static MOE was studied. And three different nondestructive testing (NDT) methods, such as the longitudinal transmission method, longitudinal vibration method and flexural vibration method (out-plane and in-plane), were used to test the dynamic properties of the reinforced poplar LVL. The correlation analysis was implemented between the dynamic Young’s modulus and the static MOE of the reinforced poplar LVL. It can be concluded that the three NDT methods are useful for predicting the MOE of reinforced LVL, but the flexural and longitudinal vibration methods had better accuracy to estimate the MOE.