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Modeling, Simulation and Applied Optimization (ICMSAO), 2011 4th International Conference on

Date 19-21 April 2011

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Displaying Results 1 - 25 of 197
  • [Title page]

    Publication Year: 2011 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2011 , Page(s): 1
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    Freely Available from IEEE
  • A one-dimensional simulation of an electrofusion welding process

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    A one-dimensional simulation of an electrofusion welding process based on finite difference method using control volume discretization is presented. Usually simulations of this nature are implemented with finite elements using a package, such as ABAQUS, with time consuming iterative computer code. This simulation is able to predict temperature and stress histories as well as giving the gap closure time of the welding process. The results of this simple simulation compared favourably with both experimental and ABAQUS values. View full abstract»

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  • Gold price prediction using radial basis function neural network

    Publication Year: 2011 , Page(s): 1 - 11
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (891 KB) |  | HTML iconHTML  

    Gold is a precious metal once widely used as a standard for monetary exchange but was replaced by paper currency mostly used today. However interest in gold trading and investment has resurfaced recently in Malaysia probably due to its price stability. Samples of gold that are used as investment include the Kijang Emas, Public Dinar and the Public Gold which are currently available to the general public in Malaysia. This project will involve developing a system to aid a gold investor in deciding the best time in the future to buy or sell gold. The system developed is based on existing gold data time series and algorithms based on Artificial Neural Networks. The system should be able to give daily prediction to its users. View full abstract»

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  • Optimization of handover algorithms in 3GPP long term evolution system

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (505 KB) |  | HTML iconHTML  

    Handover in LTE is purely hard handover. The use of break-before-connect handovers reduces the complexity of the LTE network architecture. However, the hard handover may result in data being lost. A Handover algorithm is needed for making handover decision. This decision may vary over time, depending on user's mobility. Many handover algorithms have been proposed. In this work, we optimized three well known handover algorithms in the LTE system. Simulation results show that this optimization outperforms non-optimized algorithms by minimizing the average number of handovers per UE per second while maximizing average system throughput. View full abstract»

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  • A game-theoretic multi-level optimization model for control of an international biofuel market

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (389 KB) |  | HTML iconHTML  

    This paper presents a game theoretic multi-level optimization model that aims to control the international biofuel market, driving it towards the desired scenario. The resulting model gives an interpretation of the different scenarios that could face real world energy systems. The upper level decision maker, an international body, aims to maximize the total amount of biofuel that is locally produced by each of the lower level decision makers, the countries involved, through setting appropriate adjustments on the international price. On the other hand, each country wants to minimize the cost that they individually incur from the purchase or production of biofuels in meeting their demand, subject to the price adjustments given by the national government. This interaction results in a Stackelberg game. A case study based on the international ethanol trading system is used to demonstrate the model. View full abstract»

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  • Simulation of radiation performance for mobile antennas using a hybrid FEM-FDTD computational technique

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1494 KB) |  | HTML iconHTML  

    The objective of this paper is to study the radiation performance of mobile handsets antenna by using the hybrid method between the Finite-Element Method (FEM) and the Finite Difference Time Domain (FDTD), as applied to computational electromagnetic studies, e.g. antenna scattering modelling problems. An application of modified equivalent surface boundary using the hybrid FEM-FDTD technique is presented and discussed in terms of the memory locations and processing time required for updating the equivalent surface currents from FEM to FDTD methods. A reduced equivalent surface size that encloses the radiating part of the antenna is studied and the results are compared with different sizes of the equivalent surface configurations. Several examples are presented and the results were stable and quite reasonable with published data. View full abstract»

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  • PID controller optimization for a rotational inverted pendulum using genetic algorithm

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB) |  | HTML iconHTML  

    Rotational inverted pendulum (RIP) is widely used as a benchmark system in evaluating various control strategies, as it is an ideal test bed that represents under-actuated plants. Although a proportional-integral-derivative (PID) controller is popular and relatively simple in structure, its use in balancing the RIP is usually not recommended due to the difficulties in finding the suitable PID controller parameter values for the RIP system, which has two unstable open-loop poles. Therefore, this paper presents an investigation on a PID tuning problem for stabilizing the RIP using a variant of multi-objective Genetic Algorithm (GA), called the Global Criterion Genetic Algorithm (GCGA). Simulation work has shown that GCGA is capable in tuning the PID controller gains to balance the RIP. Compared to the standard single objective GA, the solutions found in GCGA have better control performances. The optimization results have then been applied to the real RIP in order to validate the results in the real-time environment. View full abstract»

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  • Compression of volumetric data using 3D Delaunay triangulation

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (820 KB) |  | HTML iconHTML  

    In this paper we present a new method for lossy compression of volumetric data that is based on data dependent triangulation. We have extended an approach that has previously been successfully applied in the case of two dimensional images. In our method we first select significant points in the data, and using them, a three dimensional Delaunay triangulation is created. The tetrahedrons existing in the triangulation are used as cells for a linear interpolation spline that gives an approximation of the original image. The compression is done by storing the positions and values of the nodes of the tetrahedrons instead of the entire data set. We compare our compression technique to JPG 2000 3D which is a de-facto standard for compression of volumetric data. Tests are done on different classes of data sets, on which we compare the bits per voxel needed to achieve the same level of peak signal to noise ration. We show that our algorithm performs significantly different than wavelet based compression, as in the implementation of JPG 2000 3D, and in case of data that is smooth outperforms it. View full abstract»

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  • Fixed satellite service (FSS) and high altitude platform (HAP) interference assessment for adjacent channels inside HAPS coverage area

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB) |  | HTML iconHTML  

    High Altitude Platform System (HAPS) is an exceptional technology in aerial communications systems. Some inimitable facets of HAPS compose it as a spectacular service provider. However, interference with other aerial or terrestrial communications systems is a significant issue. With regards to system interference as of other commercial products or systems which perform partially at the same frequency range as HAPS, escalating HAPS performance by bringing about in conjunction with these systems seems unavoidable. One of the most significant systems which operating at the same frequency of HAPS is Fixed Satellite Service (FSS). This article concentrates on tropical and subtropical areas' coexisting systems specifications Functioning in C-band. Foremost emphasis would be given to interference amount gauge churned out by FSS uplink (5925-6725 MHz) towards HAPS gateway links in commission at 5850-7075 MHz frequency range. The criteria are compatible to and derived out from the International Telecommunication Union (ITU) and World Radio-Communication Conferences (WRCs) publications. View full abstract»

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  • A review on reconfiguration of radial electrical distribution network through heuristic methods

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (513 KB) |  | HTML iconHTML  

    Reconfiguration of Radial Electrical Distribution Network (ROREDN) is one vital analysis to optimize and control the electrical distribution system. This paper explained the application and objectives of ROREDN. There are considerable Heuristic Methods (HMs) presented by researcher for ROREDN as optimization approaches. This paper also reviewed some important strategies of HMs. The research represents that in the case of optimization methods, HMs could have remarkably solved the problems simple with fast computational times. View full abstract»

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  • Reliable and cost effective anti-collision technique for RFID UHF tag

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (469 KB) |  | HTML iconHTML  

    This paper presents a proposed Reliable and Cost Effective Anti-collision technique (RCEAT) for Radio Frequency Identification (RFID) Class 0 UHF tag. The RCEAT architecture consists of two main subsystems; PreRCEAT and PostRCEAT. The PreRCEAT subsystem is to detect any error in the incoming messages. Then the identification bit (ID) of the no error packet will be fed to the next subsystem. The PostRCEAT subsystem is to identify the tag by using the proposed Fast-search Lookup Table. The proposed system is designed using Verilog HDL. The system is simulated using Modelsim and synthesized using Xilinix Synthesis Technology. The system has been successfully implemented in hardware using Field Programmable Grid Array (FPGA) Virtex II. The output waveforms from the FPGA have been tested on the Tektronix Logic Analyzer for real time verification. Finally the RCEAT architecture is resynthesized using Application Specific Integrated Circuit (ASIC) technology for on-chip implementation. This technology consists of 0.18 μm Library, Synopsys Compiler and tools. From the hardware verification results, it shows that the proposed RCEAT system enables to identify the tags without error at the maximum operating frequency of 180MHz. The system consumes 7.578 mW powers, occupies 6,041 gates and 0.0375 mm2 area with Data arrival time of 2.31 ns. View full abstract»

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  • Optimization of biodiesel production from waste cooking oil using ion exchange resins

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (773 KB) |  | HTML iconHTML  

    Waste cooking oil is a potential alternative of refined vegetable oil for biodiesel production due to its low cost and elimination of its disposal problem. The concentration of free fatty acids (FFAs) in WCO dictates the type of chemical treatment required for biodiesel production: a single esterification reaction is considered at high content of FFAs, whereas, a combination of estrification and transestrification reaction is used at moderate content of FFAs. In this study, optimization of esterification process of FFAs in artificially acidified soybean oil with oleic acid combined with methanol as an agent and ion exchange resin as a heterogeneous catalyst was carried out. The optimization process was performed by means of Matlab software based on a kinetic model available in the literature. Conversion of acidified oil was determined as an objective function in correlation with reaction variables i.e., temperature and catalyst weight. It is found that the maximum conversion of the free acids is 95.95% which is achievable at 4.48 g catalyst loading and reaction temperature of 120°C. View full abstract»

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  • Identification and control for a single-axis PZT nanopositioner stage

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    In this paper, a second order transfer function of a single-axis PZT nanopositioner stage (P-752.21C) is identified around an operating point. The nonlinearity due to the hysteresis is modeled using look-up tables. The validation of the complete model is achieved experimentally. Two control approaches are developed. The former is a PI controller where the control parameters are tuned using Ziegler-Nichols method. The latter is a fuzzy controller like PI. The simulation results in MATLAB/Simulink are affirmed the potentials of the developed control methodologies. View full abstract»

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  • Modeling and optimization of molar volume for the binary systems containing nearcritical and supercritical CO2 applicable to micro and nanoparticles production

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (394 KB) |  | HTML iconHTML  

    The molar volume of binary systems at high pressures is an important key for production of micro and nanoparticles production. This paper compares two different equations of states of Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) for correlating and optimizing of operating conditions for 20 different binary systems to produce micro and nanoparticles. The effects of the temperature and pressure of binary systems on the molar volume of organic solvents have also been investigated. It is observed that by increasing the pressure of the system at a constant temperature, the molar volume of the liquid phase decreases, while at higher pressures a sudden volume expansion can lead to minimum molar volume of liquid phase and these conditions can be reported as a proper condition in producing micro and nanoparticles. View full abstract»

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  • The use of Fourier Descriptors to recognize particle profile

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (845 KB) |  | HTML iconHTML  

    Microscopic size wear debris transported through oil-lubricated systems provides important information about the condition of machinery, in particular the state of wear. Experts extract this information to monitor the operation of the machine to ensure safety, efficiency and economy of operation. This paper describes the analysis of microscopic particles generated by wear mechanisms by using Fourier series in terms of Fourier Descriptors and image processing techniques. The aim of the work is to develop an automated system to classify wear particles and thereby predict wear failure modes in machines. An interactive image analysis system is devised, which is used to process and store the quantitative information of particle profile. Further analysis on the stored data in the form of three Fourier Descriptors is described which extracts wear particle profile features and permits systematic profile analysis. View full abstract»

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  • Improving multi-stream heat exchanger design by reducing the number of sections

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB) |  | HTML iconHTML  

    The total annual cost (TAC) of a Heat Exchanger Network (HEN) is decreased by using Multi-Stream Heat Exchangers (MSHE), enabling a simultaneous heat exchange between more than two streams in a single unit. Several methods have been developed based on pinch concepts to design an MSHE; however, they lead to designs which are both larger and more complex than necessary. The major drawback is they usually result in designs having more individual sections than minimum. In this paper a new procedure for design of MSHE is proposed, which minimizes the number of sections required for a given duty. Having applied the new design procedure in an industrial case study, the results showed a 10% cost reduction compared to current methods. View full abstract»

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  • Four step implicit block method of Runge-Kutta type for solving first order ordinary differential equations

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB) |  | HTML iconHTML  

    In this paper, a four step implicit block method for solving first order ordinary differential equations (ODEs) is proposed. The method approximates the solutions of initial value problems at four-point mesh simultaneously using variable step size. This four step implicit method is of the multistep type but it is implemented as the Runge-Kutta type. The stability regions of the method are also studied. Numerical results are presented to show the efficiency of the proposed block method. View full abstract»

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  • Preparation of meteorological input for AERMOD using Malaysian meteorological data

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    Gaussian plume dispersion model - AMS/EPA Regulatory Model (AERMOD) has been recognised as the preferred regulatory air dispersion model and has been proven to perform better than other available models. However, Malaysian meteorological data has limited parameters and the data recorded is inadequate to be used in AERMOD. Currently, processed meteorological data has to be bought from meteorological data service providers located overseas. The processed data does not represent the real conditions experienced at the site accurately. The study involves the identification of missing data in 4 meteorological stations located in Peninsular Malaysia (Cameron Highlands, Subang, Sepang KLIA, and Kuantan), replacement of the missing data and preparation of the data in accordance with the format that AERMOD requires. The study result in a methodology to replace missing data and calculation using bulk formulae which is developed based on certain assumptions that are practical and scientific. View full abstract»

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  • Recipe generation from small samples by weighted kernel regression

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (383 KB) |  | HTML iconHTML  

    The cost of experimental setup during an assembly process development of a chipset, particularly the under-fill process, can often result in insufficient data samples. In INTEL Malaysia, for example, the historical chipset data from an under fill process consists of only a few samples. As a result, existing machine learning algorithms for predictive modeling cannot be applied to this setting. Despite this challenge, the use of data driven decisions remains critical for further optimization of this engineering process. In this study, a weighted kernel regression (WKR) is introduced to improve the predictive modeling in the setting with limited data samples. In the proposed framework, the original Nadaraya-Watson kernel regression (NWKR) algorithm is modified. Even though only four samples are used during the training stage of our experiment, the proposed approach is able to provide an accurate prediction within the engineer's requirements as compared with other existing predictive modelings including NWKR and artificial neural networks with back-propagation algorithm (ANNBP). Thus, the proposed approach is beneficial for recipe generation in an assembly process development. View full abstract»

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  • Performance analysis indoor location tracking framework with SIP on IPv6

    Publication Year: 2011 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1009 KB) |  | HTML iconHTML  

    The development of mobile computing and Wireless Local Area Networks (WLANs) has grown rapidly, nowadays. There are several approaches and practically work has been done on tracking mobile nodes and transmitting multimedia data among the network using wireless technology. Several applications and methods are being used to maintain the accuracy of tracking distance for the mobile nodes and broadcasting multimedia data at the same time. This paper focuses on the performance of indoor location tracking system on IPv6 Network Island with multiple real time applications that has location assisted transfer for mobile users and the variations of the results of developed system on different circumstances in indoor environment. RSSI (Received Signal Strength Indicator) mechanism has been used to locate the moving nodes. The developed location tracking server is having dynamic and centralized MySQL database management system. SIP (Session Initial Protocols) and customized Kphone user agent has been used to deploy the intercommunicating of multimedia data. The experiment has been conducted on different scenarios of an indoor environment with the effect of inter rooms. View full abstract»

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  • Module for online assignment submission

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB) |  | HTML iconHTML  

    There are many systems that give the ability to submit an assignment online, in an easy method for the student and the lecturer who will receive and evaluate the student work; also it gives the ability for the student to submit the assignment from different locations served by internet. The proposed model is based on identifying the user functionality that must exist in the OAS. The expected result from this model is to show the result of function test from the teacher side in e-learning process. View full abstract»

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  • Application of fractional factorial design (FFD) for screening of significant factor in influencing succinic acid production from biodiesel based glycerol: Using Escherichia coli

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    The production of succinic acid from biodiesel based glycerol was carried out using Escherichia coli K-12 MG1655 strain. The contribution of every parameter was evaluated and optimized using statistical modeling. A 26-1 fractional factorial design (FFD) was applied to screen the effect of substrate concentration, tryptone concentration, sodium carbonate concentration, inoculums density, pH and incubation period for Escherichia coli reaction on succinic acid production. The result of first order factorial design showed that glycerol concentration, tryptone concentration, incubation period and pH had significant positive effect (p>;0.001) to the reaction. Meanwhile, inoculums density and Na2CO3 concentration exhibited insignificant effect in the reaction. In addition, interaction between inoculums density of substrate concentration and tryptone concentration, glycerol concentration and Na2CO3 concentration, tryptone concentration and pH, Na2CO3 concentration and incubation period and inoculums density with pH gave significant effects (p<;0.001) to succinic acid production. View full abstract»

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  • P-graph methodology for cost-effective reduction of carbon emissions involving fuel cell combined cycles

    Publication Year: 2011 , Page(s): 1 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (433 KB) |  | HTML iconHTML  

    Fuel cells (FCs) are important for building combined energy systems due to their high efficiency. Molten Carbonate FCs (MCFC) and Solid Oxide FCs (SOFC) have been identified as best candidates for FC Combined Cycles (FCCC). This paper presents a procedure for evaluating the trends in emission levels and economics of FCCC based energy conversion systems, utilising biomass and/or fossil fuels. This involves significant combinatorial complexity, efficiently handled by the P-graph algorithms. A procedure for the synthesis of cost-optimal FCCC configurations is developed, accounting for the carbon footprint of the technology and fuel options. The results show that such systems employing renewables can be viable for wide range of economic conditions, due to the high energy efficiency of the FC-based systems. View full abstract»

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  • A 0.8 V class-AB linear OTA using DTMOS for high-frequency applications

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB) |  | HTML iconHTML  

    This paper presents a 0.8 V class-AB linear operational transconductance amplifier (OTA) using DTMOS for high-frequency applications. The circuit employs positive feedback to enhance the input impedance, and feed-forward technique to suppress the common-mode gain. The circuit is designed using 0.18 μm CMOS technology under 0.8 V supply. The simulation results show rail-to-rail input/output swing, suppressed common-mode response, and good linearity (less than -48 dB with input 0.6 Vpp, 5 MHz). The power dissipation is 155 μW. View full abstract»

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