By Topic

TENCON 2003. Conference on Convergent Technologies for the Asia-Pacific Region

Date 15-17 Oct. 2003

Go

Filter Results

Displaying Results 1 - 25 of 82
  • A distributed algorithm to align distantly related protein sequences using profile analysis

    Page(s): 1381 - 1383 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (351 KB) |  | HTML iconHTML  

    The explosive growth of biological sequence information has underscored the vital importance of integrating the computer and life sciences. Multiple sequence alignments, both DNA and protein, can be used to study different groups of related genes, to infer evolutionary relationships between them, and to discover patterns that are shared among functionally or structurally related multiple sequences. By combining the power of desktops, high performance clusters and supercomputers, grid communities can solve such heavy-computation problems affordably and efficiently. This paper focuses on parallelizing the process of finding and aligning distantly related sequences using information tables called "profiles". A dynamically scalable, heterogeneous grid of workstations implementing an intelligent job allocation mechanism is used to distribute the process. This approach focuses on both accuracy and complexity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of wavelet multiresolution analysis for classification of faults on transmission lines

    Page(s): 1464 - 1469 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (542 KB) |  | HTML iconHTML  

    This paper presents a new method for classification of faults based on wavelet multiresolution analysis (MRA). Daubechies eight (D-8) wavelet transforms of the three phase currents on a transmission line fed from both ends are used. The summations of the 3rd level output of MRA detail signals of current in each phase extracted from the original signals are used as the criterion for the analysis. The effects of fault distance, fault inception angle and fault impedance are also examined. Extensive simulations are carried out to generate time domain input signal using EMTP (Microtran) on a 230 kV, 200 km long line fed from both ends and simulation results show that the proposed method is a simple, effective and robust method suitable for high impedance faults also. View full abstract»

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

    Page(s): 1399 - 1403 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB)  

    According to U.S. Department of Health and Human Services, 26% of U.S. adults between the ages of 20 through 74 are overweight. Exercise is a consequential and rewarding strategy to lose body fat and improve one's health. Throughout a large portion of aerobic exercise, a linear relationship exists between heart rate intensity of the exercise and the oxygen consumption (and therefore caloric expenditure). Thus if the heart rate is known, caloric consumption can be reasonably estimated. This paper introduces a new piece of electronic device - fitness monitor system, specially designed for heart rate monitoring and weight management. Its output parameters prefigure one's fitness level and meanwhile give warning if there's health abnormality. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new watershed algorithm based on hillclimbing technique for image segmentation

    Page(s): 1404 - 1408 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (517 KB) |  | HTML iconHTML  

    The present paper proposes a fast watershed transform based on hillclimbing technique. The complexity of the algorithm has been reduced by doing away with multiplication normally required to form a lower complete image in an intermediate step of the overall segmentation process. Its moderate complexity makes it amenable to dedicated hardware implementation. The results of running both the proposed and the conventional algorithm on different test images clearly establish the superiority of the proposed algorithm. A prototype FPGA-based architecture for the proposed algorithm has also been developed. The FPGA implementation results show acceptable performance of the proposed architecture. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive stick-slip friction compensation using dynamic fuzzy logic system

    Page(s): 1470 - 1474 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (437 KB) |  | HTML iconHTML  

    A dynamic fuzzy logic based adaptive algorithm is proposed for reducing the effect of stick slip friction present in 1-DOF (one degree of freedom) mechanical mass system. The control scheme proposed is an online identification and indirect adaptive control, in which the control input is adjusted adaptively to compensate the effect of nonlinearity. Lyapunov stability analysis is used to ensure the boundedness of tracking errors, identification errors etc. The efficacy of the proposed algorithm is verified on a 1-DOF mechanical mass system with stick slip friction. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A complete OCR system for continuous Bengali characters

    Page(s): 1372 - 1376 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (467 KB) |  | HTML iconHTML  

    This paper is concerned with a complete optical character recognition (OCR) system for Bengali character. Recognition is done for both isolated and continuous printed multi font Bengali characters. Preprocessing steps includes segmentation in various levels, noise removal and scaling. Freeman chain code has been calculated from scaled character which is further processed to obtain a discriminating set of feature vectors for the recognizer. The unknown samples are classified using feed forward neural network based recognition scheme. It has been found from experimental results that success rate is approximately 98% for isolated characters and 96% for continuous character. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modified soft output Viterbi algorithm for truncated trellis

    Page(s): 1535 - 1538 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    In concatenated codes, the performance of the outer decoder can be improved with a soft output from the inner decoder. Soft output Viterbi algorithm (SOVA) is one such technique when the inner decoder is Viterbi based. However, when the trellis does not terminate to a single final state, the outer decoder performance does not improve substantially. In this work, we propose two methods to restore the performance. Simulation results illustrating the performance of the proposed algorithms are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance analysis of an LMS based Fourier analyzer for sinusoidal signals with time-varying amplitude

    Page(s): 1409 - 1413 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    The estimation of sinusoidal signals in additive noise finds many engineering applications. Examples are the estimation of harmonics in power systems and the pitch detection in musical transcription and so on. In this article, firstly, it is verified from numerical experiment that a least mean square (LMS) based Fourier analyzer for sinusoidal signals with time-varying amplitude can track each amplitude of cosine and sine signals much faster than the conventional LMS method. The frequency response of the algorithm in the steady state is derived in order to provide filtering insight of the adaptive algorithm in the steady state. Finally, performance analysis of the algorithm for sinusoidal signals with linearly decaying amplitude in noise is described by using the above frequency response, and it is verified that the analysis explains quite well for small step size parameters and the number of sinusoids. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Continuous measurement and monitoring of Eb/No ratio received during a remote sensing satellite-pass at a multi-mission ground station

    Page(s): 1429 - 1433 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (585 KB) |  | HTML iconHTML  

    Remote sensing satellites transmit imaging data using PSK modulation schemes with very wide range of data rates. Continuous on-line monitoring and measurement of energy-per-bit to noise-density (Eb/No) ratios received during a satellite-pass become essential to perform the real time data quality analysis [Jain, P.K. et al., March 2003]. The real time estimation of Eb/No is also useful during the initial phase of the mission, i.e.. immediately after the launch of the satellite and switching on the payloads as the level fluctuations, if any, can be analyzed properly. Besides, the link analysis and practical assessment of the link margins are essential to optimize the receive chain parameters for real time compatibility [Limaye, U.D., October 1993]. This paper describes various methods to carry out this measurement with an emphasis on a unique technique developed in National Remote Sensing Agency. Dept. of Space. Govt. of India, Hyderabad. This technique uses a long loop PLL carrier recovery circuit of a multi-mission PSK demodulator and is found superior over other methods on several counts. The method has been tested for various PSK schemes at different data rates and implemented successfully in a remote sensing satellite ground station. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Data-aided timing offset estimation for frequency selective fading channels

    Page(s): 1530 - 1534 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB) |  | HTML iconHTML  

    In this paper, a novel algorithm for timing offset estimation is proposed for GSM and GPRS handsets, especially for multipath channels with large delay-spread. The timing offset leads to errors in the channel response estimation with a consequent increase in the overall bit error rate (BER). Thus, timing synchronization and tracking are crucial for satisfactory functioning of burst mode mobile communication receivers. In the proposed technique, minimum residual error energy concept is used for capturing multi-path delay profile and correlation based method is used for fine timing offset. Some simulation results are provided to illustrate the effectiveness of the proposed method. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An order-recursive pipelined real-time VLSI HOS engine for system-on-chip implementation

    Page(s): 1257 - 1261 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (314 KB) |  | HTML iconHTML  

    This paper presents a novel fully pipelined parallel processing VLSI architecture for the order-recursive estimation of higher order statistics(HOS) in real-time. Compared to other recent work in array computation of HOS this approach presents a fine-grained systolic VLSI architecture using simple arithmetic elements & delay elements. Also, compared to previous work which mostly dwelt on 4th & lower order statistics, this work presents an open ended upwardly compatible architectural engine which can generate HOS for any high order. The through-put of this proposed HOS engine is only limited by a multiplication interval. Hence using today's deep subquarter micron CMOS process technology, through-puts in the range of 500 MHz to 1 GHz can be achieved for this HOS engine. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A fuzzy-neural approach to electricity load and spot-price forecasting in a deregulated electricity market

    Page(s): 1479 - 1482 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB) |  | HTML iconHTML  

    Accurate short term load forecasting is crucial to the efficient and economic operation of modem electrical power systems. With the recent effort by many governments in the development of open and deregulated power markets, research in forecasting methods is getting renewed attention. Although long term and short term electric load forecasting has been of interest to the practicing engineers and researchers for many years, spot-price prediction is a relatively new research area. This paper examines the use of a neural-fuzzy inference method for the prediction of 24 hourly load and spot price for the next day. Publicly available data of the electricity market of the state of New South Wales, Australia is used in a case study. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A VHDL implementation of BIST technique in UART design

    Page(s): 1450 - 1454 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (449 KB) |  | HTML iconHTML  

    To increase reliability, manufacturers must be able to discover a high percentage of defective chips during their testing procedures. This paper would highlight the attention given by most customers who are expecting the designer to include testability features that will increase their product reliability. This paper focuses on the design of a UART chip with embedded built-in-self-test (BIST) architecture using FPGA technology. The paper starts by describing the behavior of UART circuit using VHISC hardware description language (VHDL). In the implementation phase, the BIST technique will be incorporated into the UART design before the overall design is synthesized by means of reconfiguring the existing design to match testability requirements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The performance evaluation of a smart antenna receiver for WCDMA

    Page(s): 1590 - 1594 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB)  

    This paper presents the performance of a smart antenna receiver for the uplink of a wideband code division multiple access (WCDMA) system in the frequency division duplex (FDD) mode. The beam-forming is implemented with a Lagrange multiplier based algorithm using Q channel. The results show that the smart antenna offers significant performance enhancement over a single antenna in a 3G environment (i.e.. with mixed traffic). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fault detection, diagnosis and control in a tactical aerospace vehicle

    Page(s): 1357 - 1361 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    In this paper we propose a fault-tolerant control ( FTC ) scheme using multiple controller switching. The performance of this scheme is studied on a tactical aerospace vehicle. A parity space (PS) based residual generation approach is used to detect the fault. Once a fault is detected the diagnosis scheme identifies the faulty actuator. Using this information on-line reconfiguration of the controller is done based on the configuration of the existing healthy actuator. To implement this scheme no modification were done in hardware (H/W) configuration and only existing redundancies were utilised. Simulation with nonlinear 6-degree of freedom (6-DoF) model shows that the above fault tolerant control approach is able to reduce the probability of failure due to actuators. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Methods for classification of phonocardiogram

    Page(s): 1514 - 1515 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    The emergence of cardiac surgery and with it an imperative need for precise anatomical diagnosis have revived the technical advancement necessary for the amplification and recording of cardiovascular sounds. The study of phonocardiography has developed out of this confidence. The recordings of the sounds, produced by the mechanical activity of the human heart that contains vital information are called phonocardiogram and the device used to record is called phonocardiograph. The objective of this work is to find an efficient method to diagnose the heart diseases from their heart sounds. We have implemented various methods including neural network, fuzzy system and wavelets to recognize the heart diseases and their efficiencies were compared with each other. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Clustering of automobile information using self organizing maps

    Page(s): 1267 - 1271 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    This work develops methodology for clustering automobile related collection of documents. The work implements the system that organizes vast document collection according to textual similarity. It uses neural network approach to cluster collection of data, based on Kohonen's self-organizing maps (SOM ) which is unsupervised competitive method of learning. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast convergence LMS adaptive filters employing fuzzy partial updates

    Page(s): 1334 - 1337 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB)  

    This paper presents a method to improve the performance of reduced calculation adaptive filters. We use the sequential partial update method to achieve low computation complexity. Furthermore, we include the variable step-size approach to aim last convergence. The variable step size approach is based on a fuzzy method to determine the appropriate step-size on each iteration step. By using the proposed method, the adaptive filter converges faster while pretending the steady state error as the previously proposed reduced calculation adaptive filler. The instantaneous step size is determined from the present square of the error signal to produce sudden changing. Additional rule or conditions are included to prevent the adaptive algorithm to become unstable. Simulation results are presented to compare the performance of the new approach, the fixed step-size LMS algorithm and sequential partial update LMS (S-LMS) algorithms. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Script to speech conversion for Marathi language

    Page(s): 1262 - 1266 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (453 KB) |  | HTML iconHTML  

    This paper investigates the method for "Devnagari script to speech conversion" as applied to Marathi language by developing the appropriate software. Pre-processing of the typed text is done. The neural network does the pattern matching and character recognition. Neural networks learn from examples and are fault tolerant. Output of neural network is recognized character. The dictionary of .wav files is prepared. After combining the recognised characters they are matched with the words in the .wav file. If the match occurs the success rate is 100% or otherwise the approach of forming the characters is adopted. Using sound playing functions the recognized words are played. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Speech coding a new approach

    Page(s): 1483 - 1485 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (395 KB) |  | HTML iconHTML  

    Text-to-speech synthesis, based on ESNOLA, uses signal dictionary having raw sound signals representing parts of phonemes. State-phase analysis for detection of voiced region along with detection of pitch also may be used for extraction of the most appropriate signal elements automatically from continuous speech in real time. The signal elements at the voiced zone are perceptual-pitch-periods. These signal are coded by simply inserting one information byte at the beginning of each element. The decoding is done using the information bit. The intervening signals are regenerated by linear estimation from the two perceptual-pitch-periods. This coding induces a ten-fold information reduction without significant loss of naturalness. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • TCP/IP protocol stack analysis using MENet

    Page(s): 1329 - 1333 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (467 KB) |  | HTML iconHTML  

    As computing systems grow in complexity, the cluster and gird communities require more sophisticated tools to diagnose, debug and analyze such systems. Current network monitoring tools capture network traffic as it appears on the network. These tools are incapable of capturing traffic as it progresses through a running protocol stack. The monitoring tools cannot lend insight to the modulating behavior of TCP (transmission control protocol) UDP (user datagram protocol) that have been shown to dominant the network traffic and impact network performance. The current generation of tools cannot record true application traffic demands and cannot capture protocol state information with respect to the TCP/IP stack at run time in order to help fine tune network performance. The developed tools focus more on presenting the statistics like IP addresses, higher level protocol, host etc. In this paper we introduce a MENet (monitor for Ethernet network traffic). The toolkit is an extension to the earlier developed utility for traffic monitoring. The toolkit is operational on the platform of Windows NT/2000. The toolkit is developed by programming in Microsoft Visual C++ environment. The MENet decrypts the packets passing through a system. We first present the design of the toolkit and then demonstrate the implementation with screen shots taken on real time traffic. Next we evaluate the working of the toolkit, its performance and its potential use in application such as protocol tuning a traffic characterization. The protocol analysis demonstrates the effectiveness of MENeT for monitoring. The work on presenting the stats to portray the network traffic from every angle is in place. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Phase-locked loop design for flexible mode tracking

    Page(s): 1277 - 1283 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (646 KB) |  | HTML iconHTML  

    This paper describes the design of PLL to track sinusoid flexible mode signals in flexible satellites. The phase detector of the PLL is associated with a low pass filter which is usually not shown in literature. Specifications of the low pass filter are developed based on the frequency of the flexible modes. Subsequently, the filter order is designed with the desired suppression at high frequency. The control loop filter is designed to force the phase error to zero avoiding interaction with the phase detector. Simulation studies show tracking of frequency uncertainty up to ± 50% deviations with noisy signals with PLL designed for 30% uncertainty in frequency. A robust design has been achieved meeting the desired performance goals. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design optimization of inverter fed 3-phase squirrel cage induction motor

    Page(s): 1303 - 1307 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB) |  | HTML iconHTML  

    Static inverter fed induction motor drive is an important competitor in the field of variable speed drives. Design optimization of a six-stepped three-phase inverter fed squirrel cage induction motor for minimum cost and maximum frequency operation is presented in this paper. Additional winding loss, core loss, stray loss and torque pulsations produced by harmonic voltages over a frequency-range that influence the design parameters are considered as constraints. In addition many important constraints at minimum frequency such as no-load power factor, locked rotor current and at maximum frequency pullout torque etc., are imposed to satisfy the performance characteristics. Nonlinear programming technique (NLP) employing Powell's unconstrained optimization method together with Zangwill's exterior penalty function formulation is applied to a mathematical model of an inverter fed 3-phase squirrel-cage induction motor with 11 design variables and a number of performance constraints. The optimal solution by this method efficiently proved the design optimization procedure adopted in this paper satisfying the constraints to predict the machine performance. View full abstract»

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

    Page(s): 1595 - 1599 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (474 KB) |  | HTML iconHTML  

    This paper talks about information congestion in an enterprise. The various reasons for information congestion, strategies and guidelines like portals, content management systems, personalization and framework based solution to control information congestion in an enterprise. By keeping a futuristic view, this paper also demonstrates how business process modeling based on emerging standards like intelligent agents can address information congestion. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modeling of standalone and networked ATM switches (N-AtmSim) using discrete event simulation with TCP/IP sockets

    Page(s): 1516 - 1520 Vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (331 KB) |  | HTML iconHTML  

    Simulation determines the system behavior prior to design and implementation phase. Simulation of ATM switch has various complexities to be handled; simulating the hardware parallelism is one of them. We have developed an ATM switch framework (ATMSim), which provides a basic framework for future modules to be plugged in. In our current implementation, we have considered the data plane only. Our framework would be useful in the sense that it provides a unique ATM simulation architecture, which can be utilized by the academicians, institutions and the industry for experimenting over an ATM network and in the future to simulate other components of the ATMSim is "PROTOCOL AGNOSTIC" in the sense that, it can be converted to any L2/L2.5 protocol switch (viz. MPLS, gigabit Ethernet switch). The switch fabric used, is a library, rich with features and supporting different user defined configurations. The pre and post processors are also in the form of the library, which is highly flexible. View full abstract»

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