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Science: Recent submissions

  • An Approach to Online e-Assessment For Distance Learning 
    Wannige, C.T.; Sonnadara, D.U.J.; Usoof, H.A.; Hewagamage, K.P. (2007)
    The main objective of this work is to provide an evident system of preventing plagiarism in a less supervised environment for distance learning. The assumed environment consists of a supervisor, who is in charge of a ...
  • Virtual Instrumentation: A way to Build Low Cost Laboratory Instruments 
    Fernando, H.T.T.M.; Sonnadara, D.U.J. (1998)
    A detailed study on building virtual instruments using Personal Computers equipped with Sound Blaster cards was carried out. A computer with a Sound Blaster card can be used to create virtual instruments with a 44.1 KHz ...
  • Speech Recognition - Application to the Sinhala Language 
    Warusawithana, M.P.; Sonnadara, D.U.J. (1998)
    A simple speech recognizer was implemented for the Sinhala language by using FFT combined with Mel scaled filter banks. The accuracy of the speech recognizer depends on what words are in the vocabulary, the number of ...
  • The Role of Site Selection on Localizing Ground Flashes in an Automated Lightning Detection Network 
    Sonnadara, D.U.J.; Fernando, I.M.K.; Namasivayam, S.; Ariyaratne, T.R.; Jayaratne, K.P.S.C. (1999)
    A Monte-Carlo simulation was used to optimize the accuracy of strike location of ground flashes depending on the selection of placement of the direction finding base-stations. A computer program was developed to reconstruct ...
  • Parallel Port Based Data Acquisition System for IBM or Compatible Personal Computers 
    Dedigama, A.R.; Sonnadara, D.U.J. (1999)
    A study on building a parallel port based data acquisition system for IBM or compatible personal computers is carried out. A circuit based on an 8-bit ZN448E Analogue-to-Digital Converter (ADC) was successfully constructed ...
  • Low Cost Data Acquisition and Control Systems for Personal Computers 
    Jayananda, M.K.; Sonnadara, D.U.J. (1998)
    A detailed study of building low cost data acquisition and equipment control systems for personal computers containing analog-to-digital (ADC) and digital-to analog (DAC) converters is carried out. Two types of boards ...
  • An Electronic Surveillance System for Night-Flying Birds (Bats) 
    Edirisinghe, C.M.; Sonnadara, D.U.J.; Yapa, V. (1998)
    The construction of an electronic surveillance system that can be used to count night-flying birds passing through a 2-D window is presented. The surveillance system has been designed primarily to estimate the number of ...
  • A Computerized Temperature Control System 
    Weerasinghe, W.A.T.; Sonnadara, D.U.J. (1997)
    The objective of this work is to control the temperature of a furnace using an IBM compatible computer. The input data to the system are temperature sensor readings taken at constant intervals. An output signal from the ...
  • An Investigation of Digital Filtering Techniques 
    Fernando, L.M.T.D.; Sonnadara, D.U.J.; Ranasinghe, D.N. (1997)
    A study carried out on Digital Filtering Techniques covering signal digitization, the theory of digital filtering techniques, and the implementation of digital filters. The digitization covers theories related to signal ...
  • Use of BBC Micro Computers in Physics 
    Rodrigo, B.M.A.; Sonnadara, D.U.J. (1997)
    Interfacing micro computers with laboratory equipment enables the control of equipment and the analysis of experimental results to be performed effectively. In this paper we discuss how this can be done for three standard ...
  • Evidence of self organized criticality in rainfall 
    Wijesekera, H.M.; Sonnadara, D.U.J. (2010)
    Rainfall is a product of a number of complex processors having completely different temporal and spatial characteristics. The hypothesis that rainfall might be a case of self organized criticality was tested using rainfall ...
  • Analysis of Lightning activities over Sri Lanka using Satellite data 
    Perera, M.M.; Sonnadara, D.U.J. (2010)
    Abstract: A study was carried out to analyze the lightning activity over Sri Lanka and in the area around the Indian Ocean using Optical Transient Detector (OTD) data. The "lightning data" is simply the optical pulses ...
  • Measurement of noise levels at the vicinity of hospitals 
    Kalansuriya, C.M.; Sonnadara, D.U.J.; Pannila,A.S. (2009)
    A study was carried out to determine the noise levels in and around hospital areas where patients need comfort for speedy recovery. A total of seventeen hospitals were selected for this work; namely, eleven government ...
  • Community response to road traffic noise 
    Kalansuriya, C.M.; Pannila, A.S.; Sonnadara, D.U.J. (2008)
    A study was carried out to determine community response to noise levels in the vicinity of traffic routes. Noise levels in category A, B and C grade roads were measured and the responses of the residents living within 25 ...
  • Measurement and evaluation of road traffic noise levels 
    Kalansuriya, C.M.; Sonnadara, D.U.J.; Pannila, A.S. (2007)
    A study was carried out to determine the existing road traffic noise levels in category A, B and C grade roads. A total of 5 separate locations, each with different traffic conditions were selected for this work. Noise ...
  • Stochastic modelling of dielectric breakdown 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2006)
    Using a 2D stochastic dielectric breakdown model, patterns of lightning discharges and surface discharges were studied. The model based on a Laplacian growth, develops the breakdown process stepwise, choosing one lattice ...
  • Fractal properties of long sparks 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2006)
    Two methods have been utilized to study the fractal nature of long laboratory sparks. The first method based on a statistical technique use the variation in angle between consecutive steps to deduce the fractal nature in ...
  • Study of multipliers in programmable logic devices 
    Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2006)
    Hardware multiplier is a major component in many computational and DSP systems which are implemented in Field Programmable Gate Arrays (FPGA). Since there are no universally accepted methods, designers often need to construct ...
  • Optical signatures of electrical breakdown trajectories in air 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2005)
    Optical signatures of electrical breakdown trajectories in air were investigated by utilizing image processing techniques on a set of photographic images. The experimental technique consisted of capturing the photographic ...
  • Analysis of tortuosity of long laboratory sparks 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2005)
    Channel tortuosity of 50 cm long laboratory sparks were measured by processing a series of images taken by 3 cameras placed at a radial distance of 200 cm from the sparks with the angle between two cameras being 120. The ...

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