By Topic

Digital Manufacturing and Automation (ICDMA), 2012 Third International Conference on

Date July 31 2012-Aug. 2 2012

Filter Results

Displaying Results 1 - 25 of 259
  • [Back cover]

    Page(s): C4
    Save to Project icon | Request Permissions | PDF file iconPDF (1784 KB)  
    Freely Available from IEEE
  • [Title page i]

    Page(s): i
    Save to Project icon | Request Permissions | PDF file iconPDF (35 KB)  
    Freely Available from IEEE
  • [Title page iii]

    Page(s): iii
    Save to Project icon | Request Permissions | PDF file iconPDF (72 KB)  
    Freely Available from IEEE
  • [Copyright notice]

    Page(s): iv
    Save to Project icon | Request Permissions | PDF file iconPDF (123 KB)  
    Freely Available from IEEE
  • Table of contents

    Page(s): v - xix
    Save to Project icon | Request Permissions | PDF file iconPDF (234 KB)  
    Freely Available from IEEE
  • Preface

    Page(s): xx
    Save to Project icon | Request Permissions | PDF file iconPDF (75 KB)  
    Freely Available from IEEE
  • Organizing Committee

    Page(s): xxi
    Save to Project icon | Request Permissions | PDF file iconPDF (105 KB)  
    Freely Available from IEEE
  • Technical Program Committee

    Page(s): xxii
    Save to Project icon | Request Permissions | PDF file iconPDF (128 KB)  
    Freely Available from IEEE
  • Reviewers

    Page(s): xxiii
    Save to Project icon | Request Permissions | PDF file iconPDF (64 KB)  
    Freely Available from IEEE
  • 3D Model Retrieval Based on Projected Area at Mesh Vertex

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (340 KB) |  | HTML iconHTML  

    The conventional shape feature-based method did not describe the local feature enough. This paper proposed a new 3D model retrieval method based on projected area at mesh vertex. First, sum the projected area on vertical plane of the normal vector at mesh vertex, then normalized the list of the projected area distributions and transfer these data by Fourier transform method. Then the result is defined as 3D model's feature vector which can be used to calculate the similarity of different models. Experiments were conducted to evaluate the proposed algorithm utilizing the Engineering Shape Benchmark (ESB) database. The experiential results show that the proposed methods effectively reflect the similarity among engineering models, and the match result of the models is accurate and the retrieval performance is significantly improved compared to traditional shape distribution method. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Policy-Based Adaptive Scheduling Model of Software Resource in ITSGrid

    Page(s): 5 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (315 KB) |  | HTML iconHTML  

    Because of the distribution and heterogeneity of application software license resource in ITSGrid, more than one resource node could satisfy requirements of large-scale computing services in ITSGrid. How to select software license resources among ITS resource nodes, determine appropriate license resource scheduling strategy for computing tasks and maximize utilization rate of expensive large-scale software is becoming a problem must be addressed in ITSGrid. In this paper, we analyze the architecture of resource node in ITSGrid, design a policy-based adaptive scheduling model of application software license resource for ITSGrid, propose relative adaptive scheduling algorithm for application software license, solve license resource global scheduling problem in ITSGrid, which could improve ITSGrid system throughput, shorten waiting and response time of large-scale computing jobs and maximize benefit of expensive application software in ITSGrid. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Bandwidth Allocation Strategy Based on the Proportion of Measurement Error in Networked Control System

    Page(s): 9 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (186 KB) |  | HTML iconHTML  

    Considering bandwidth limitation of networked control system (NCS), the performance of control system must be guaranteed and the bandwidth resources should be rational utilization. In order to realize the co-design of control and scheduling in networked control system, a proportion type of bandwidth allocation strategy is proposed in this paper. The remote controller which contains a QoS regulator is employed to allocate the bandwidth dynamically in a rational proportion by the measurement errors of each control loop. At last, a simulation is given which shows the feasibility of this strategy. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Case Study of LCA for Environmental Protection in Steel Company

    Page(s): 13 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (266 KB) |  | HTML iconHTML  

    In China, as sustainable development strategy being implemented, quantitative evaluation of environmental load in steel industry has paid been more and more attention. In this paper, Life Cycle Assessment (LCA) was applied in evaluation of the steel production process, analyzing the energy and materials consumption of Tangshan stainless steel industry in 2009. Based on inventory analysis, environment impact, global warming potential and human health influence were evaluated with three methods of Gabi4.3 software: EDIP, CML2001and Eco-indicator 99 (EI99). The results of LCA showed us that the high energy and pollution processes were iron-making, hot rolling and sintering, and the energy consumptions were 1166.22MJ, 837.92MJ and 633.45MJrespetively. Iron-making process was most harmful to environment and human health, so technological and managerial measures should be adopted to reduce the impact. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comparative Study on Airbag Inflation Properties Using CV and ALE-Based Approaches

    Page(s): 17 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (258 KB) |  | HTML iconHTML  

    This paper compared airbag deployment properties between two simulation approaches in LS-DYNA: the thermodynamic-based control volume (CV) method and the Arbitrary-Lagrange-Eulerian (ALE-based) method. The results from airbag static deployment test and head form impact test indicated that the ALE approach is more accurate than CV approach in simulating airbag initial deployment stage, and the simplified CV approach is inappropriate for analysis of occupant safety in the Out-of-Position (OOP) case. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comparative Study on Biofidelity between TRL and LSTC Legform Impactor

    Page(s): 21 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (214 KB) |  | HTML iconHTML  

    The purpose of this paper is to compare the biofidelity of LSTC and TRL legform impactor. A finite element model of simplified front vehicle structure was established. The simulation tests were conducted by using this simplified car model against two different legform impactors and a FE lower extremity, respectively at a speed of 40km/h. The simulation results from the two legform impactors were compare with that of the FE lower extremity. The compared outputs include tibia acceleration, shear displacement, knee bending angle. The test results show that the tibia acceleration of the impactors and the FE lower extremity are approximately consistent. As to the shear displacement and the knee bending angle, though the output of the impactors are not agreed so well with that of the FE lower extremity, the trend are comparable to some extent. The results of the FE lower extremity are higher than that of the legform impactors. The results of LSTC impactor has a better agreement with that from FE lower extremity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Compound Control for PMSM Based on Fuzzy Sliding-mode and Neural Network

    Page(s): 25 - 29
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1404 KB) |  | HTML iconHTML  

    Permanent magnet synchronous motor (PMSM) system has many characteristics such as nonlinearity, time-varying parameters and complex modeling. PMSM system is required to become quick response and insensitivity to the variation of parameters and disturbance especially in the electric vehicle. In order to solve the problems, this paper presents a new compound control method containing fuzzy control, sliding-mode variable structure control and neural network control. The effectiveness of the proposed controller is demonstrated by MATLAB/SIMULINK. The result shows that this scheme has not only excellent dynamics and steady-state performance but also excellent robustness to external disturbance. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comprehensive Model for Evaluation of Carbon Footprint and Greenhouse Gages Emission in Household Biogas Plants

    Page(s): 30 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB) |  | HTML iconHTML  

    Based on Life Cycle Assessment and other related methods, this paper introduced a comprehensive model for the evaluation of the carbon footprint and greenhouse gases emission in household biogas plants including nearly all the processes of the household biogas project, such as the collection of raw materials, fermentation processing, and fermentation residue processing and so on. The carbon footprint and greenhouse gas emission from three classical household biogas plants in China were analyzed. Considering the greenhouse gases emissions in life cycle of household biogas plants, the main emission processes were investigated to be the utilization of biogas, such as biogas combustion use and transportation of materials which both accounting for more than 98%. The greenhouse gases emissions in the stages of methane leakage and construction materials production were only estimated to be 1.1% and 0.5%, respectively. As comparing to the meandering fabric digester and the precast reinforced concrete panels fabricated digester, the in-situ concrete cylindrical water pressure digester showed the lowest carbon footprint and accordingly most potential for the reduction of greenhouse gases emission. It tried to analyze three household biogas plants' carbon footprint and greenhouse gas emission during the stages. It can provide the basis for optimization low-carbon proposal and the analysis and built up a simple carbon footprint calculation model. About household digesters life cycle greenhouse gas emissions, the main emission process are biogas utilization period and transport phase , accounting for more than 98.38 percent , followed by methane leak stage and building materials production stage, about 1.11% and 0.51% .Compared to meandering fabric type digesters and precast reinforced concrete panels fabricated digesters, in-situ concrete cylinder shaped hydraulic digester's carbon footprint is minimum so greenhouse gas emission reduction potential is great. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Design and Implementation of Decimal Floating-point Multiplication Unit Based on SOPC

    Page(s): 36 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    Processor design is a widely studied topic in computer system architecture design. How to improve computer performance is an important part of the computer overall design. In general processors, multiplication components play a decisive role in processor's performance. An important and frequent operation in decimal computations is multiplication. However, due to the inherent inefficiency of decimal arithmetic implementations in binary logic, practically all the proposed decimal multipliers are sequential units. Binary computing couldn't be avoided of conversion efficiency lowly and loss of accuracy. In this paper direct expanding the decimal computing applications and binary can't meet the needs of decimal operations, according to this new standard IEEE-754r, use SOPC technology design and implement a new architecture based on the decimal floating-point multiplication unit. This design takes advantage of flexibility and low-power of SOPC, the independence of IP core and so on; it is packaged as an independent IP core. This decimal floating-point multiplication unit is broadly applications in the general processors, portable devices, and mass data processing and so on. It uses Signed-Digit radix-4 algorithm and new BCD coding techniques for the decomposition of decimal floating-point computing. and compared with the common single-precision binary floating-point unit, it was wider computing, higher accuracy, faster computing speed and wider application. The main contributions of this paper include: (1) Customized a 32/64 bit fully functional decimal floating point multiplication IP core; (2) Improved partial products based on the BCD-8421 and revised parts of the circuit; (3) According to the customized component operational requirements, defined a way of data bus, caused decimal floating point multiplication unit is good access SOPC system bus. This unit can be well used to processors, which support the standard of decimal floating-point operations, to improve pr- cessor performance. This model is verified by synthesis to Altera's low cost Cyclone II FPGA. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Fast Ellipse Detection Method in Planar Target Image

    Page(s): 42 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (139 KB) |  | HTML iconHTML  

    Aim at the target image with high quality and strong regular pattern, a fast ellipse detection method is presented in this paper. According to the topological structure of the target pattern, the method quickly collects edge points and calculates the possible ellipses, then verifies the possible ellipses to further determine the final correct geometric parameters of ellipses by using the ellipse raster conversion process. The proposed method does not depend on edge detection and spatial transformation operation, it significantly reduces the amount of calculation. Experimental results demonstrate that this method not only can guarantee the extraction accuracy, but also meet the requirement of fast on-line detection of the target image. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Fault Feature Extraction Method for Machine Health Diagnosis Using Manifold Learning

    Page(s): 46 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    The fault signature can be revealed by vibration analysis in machine fault detection and diagnosis. It is difficult to evaluate the status of machine for that non-stationary and non-linear vibrations are often caused in machine working process. Manifold learning is a new method for dimensionality reduction and information mining of nonlinear data. In this paper, four statuses of rolling bearing were simulated to investigate status features extraction using manifold learning method. Compared to principal component analysis (PCA), the low dimensional embedded features extracted by the Local tangent space alignment (LTSA) algorithm have excellent clustering quality. Experimental results indicated that the LTSA algorithm has great merit in good clustering with small within-class distance, and thus provides an effective method for intelligent diagnosis of rolling bearing. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Flexible Part Library System

    Page(s): 50 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB) |  | HTML iconHTML  

    In mechanical product design, designers usually reuse a large number of standard parts and commonly used typical structures accumulated in long-term industry design practice. In this paper, a flexible part library system is proposed to promote the flexibility of PLS. The system uses a flexible part information presentation and User dynamic interface to realize the parameter diversity, and can adapt different CAD and DBS with four layer framework and Interface Oriented Programming. At last, a clamp part reusing is taken as a case study to show the flexibility and intelligence of the system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Fully Integrated Single Photon Avalanche Diode Detector in 130 nm CMOS Technology

    Page(s): 54 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (227 KB) |  | HTML iconHTML  

    Measurement of weak optical signals is becoming more and more prevalent in different fields of science. Single Photon Avalanche Diode (SPAD) is one of the most important active devices that are able to detect photons. When a photon is detected, the SPAD will generate an increasing current and a short duration voltage pulse. As a result, this SPAD device must be biased by a quenching circuit, which, after rapid sensing of the avalanche current, must be able to switch off and reset the diode to its initial condition as fast as possible. Since the number of pulses generated by a SPAD in a particular time interval is proportional to the intensity of the photons falling on the SPAD, a readout approach based upon 2D arrays is therefore created. In this paper, a compact active quenching circuit and an innovative readout circuit are both presented. Compared to other quenching and readout circuitry in many literatures, the active quenching circuit performs ultrafast and the readout circuit provides two different output methods. The whole circuitry is extremely compact that can be embedded in the limited area between SPADs in a 2D array, which is the most outstanding advantage. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Group-Based Hybrid Wear-Leveling Algorithm for Flash Memory Storage Systems

    Page(s): 58 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (257 KB) |  | HTML iconHTML  

    Wear-leveling algorithm is required in most flash memory controllers to prolong the lifetime of flash memory by distributing the erase operations evenly across the whole flash memory. This paper proposes a group based wear-leveling algorithm which can dramatically reduce the RAM space required by wear-leveling algorithm while maintaining the wear-leveling performance. We adopt random wear-leveling policy which requires very little RAM space inside a group to make the data in the group move around and the wear in the group respectively even. And a threshold controlled static wear-leveling policy is adopted among different groups to make the average wear of different groups even. A series of trace-driven simulations show that our group based algorithm consumes only 78% of RAM space compare with previous group-based wear-leveling algorithm which require complex data structure, while maintaining nearly the same wear-leveling performance. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A High Capacity Information Hiding Method for Webpage Based on Tag

    Page(s): 62 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (138 KB) |  | HTML iconHTML  

    Current Information hiding algorithms for webpage have some shortcomings, such as the ability of concealment is poor and the embedded capacity is little. As the tag and its' attributes have multi-express rules, a new information hiding algorithm is proposed in this paper. This Information hiding algorithm sets secret information into a binary sequence, then set 3 bits as a set to be hidden in page tag attributes on random. As showing in the experimental results, this algorithm can significantly increase the embedded capacity, and will not increase the size of cover-webpage, so it has better imperceptibility and higher capacity than the traditional algorithm. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Load Balanced Differentiated Services Support CICQ Switch

    Page(s): 66 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (230 KB) |  | HTML iconHTML  

    How to provide quality of service (QoS) guarantees in routing and switching systems has become one of the key research topics in the areas of routing and switching technologies. Differentiated services architecture (DiffServ) is known as a promising way for supporting QoS in a high-speed backbone network scenario. However, the measurement indexes for realtime multimedia traffic, which plays very important roles in next generation internet, are not so clearly defined. In this paper, a new service architecture called SOQG (Service Orient QoS Guarantees) aiming at providing QoS guarantees for multimedia traffic is first proposed. SOQG classifies the internet traffic into five classes: EF, JCC, BCG-H, BCG-L and BE. Then, Based on this architecture, we propose a new switch called load balanced differentiated universal service support switch (LBDU). LBDU consists of three modules: BCU (Bandwidth Control Unit), LBS (Load Balanced Scheduling) and XOS ( Cross-point Output Scheduling). We evaluate LBDU by comprehensive simulations. As expected, LBDU can provide delay and bandwidth guarantees for both EF and JCC traffic. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.