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Department of Physics: Recent submissions

  • A simple polarized-based diffused reflectance colour imaging system 
    Hiran H. E. Jayaweera; Anderso, B; Eghan, M.J. (2013)
    A simple polarized-based diffuse reflectance imaging system has been developed. The system is designed for both in vivo and in vitro imaging of agricultural specimen in the visible region. The system uses a commercial web ...
  • Rare Events in Remote Dark Field Spectroscopy: An Ecological Case study of Insects 
    Runemark, Anna; Wellenreuther, Maren; Hiran H. E. Jayaweera; Svanberg, Sune; Brydegaard, Mikkel (2013)
    In this paper, a novel detection scheme for the monitoring of insect ecosystems is presented. Our method is based on the remote acquisition of passive sunlight scattering by two insect species. Procedures to identify rare ...
  • Construction of an Automated Weather Station for Ground Level Weather Measurements 
    Weerasinghe, R.M.; Aroos, M.S.M; Pannila, A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2011)
    Development of an automated weather station with remote data transmission capability is presented. The complete system consists of three separate modules for data collection, data storage and data communication. The modules ...
  • Classification of Birds using FFT and Artificial Neural Networks 
    Abewardana, Anuradha; Sonnadara, D.U.J. (2012)
    The use of feed-forward artificial neural network to categorize a selected set of Sri Lankan bird species based on their vocalization is presented. The inputs to the neural network were frequencies of bird vocalizations ...
  • An artificial neural network model for river flow forecasting 
    Selventhiran, U.; Premaratne, H.L.; Sonnadara, D.U.J. (2012)
    An artificial neural network model developed to forecast river flow/discharge is presented. The model is based on the feed-forward, back-propagation network architecture optimized through a conjugated training algorithm. ...
  • Autonomous Robot Navigation System Based on Optical Flow 
    Illeperuma, G.D.; Sonnadara, D.U.J. (2011)
    A simulation and a pilot scale implementation of a vision based robot navigation system was carried out to determine the feasibility and the efficiency of using optical flow based algorithms on autonomous robot navigation. ...
  • Stochastic Simulation of Trees with Environmental Sensitivity 
    Jinasena, K.D.S.; Sonnadara, D.U.J. (2012)
    Modeling visually realistic trees is a challenging problem in computer graphics due to the complex variation of tree forms and interactions with the surrounding environment. In this work, we present a new stochastic algorithm ...
  • Reconstructing Monthly Temperature Time Series in Jaffna: A Neural Network Approach 
    Thevakaran, A.; Sonnadara, D.U.J. (2012)
    The meteorological station in Jaffna (8002’E, 941’N) which is the main meteorology station to maintain weather records for the northern peninsula experienced difficulties in collecting data during the period from 1984 ...
  • Development of Feature Based Artificial Neural Network Model for Weather Nowcasting 
    Sampath, Vajira; Premeratne, H.L.; Sonnadara, D.U.J. (2010)
    The performance of Artificial Neural Networks in forecasting the short range (3-6 hourly) occurrence of rainfall is presented. Feature sets extracted from both ground level weather parameters and satellite images were used ...
  • Forecasting Droughts Using Artificial Neural Networks 
    Ileperuma, Gayan; Sonnadara, D.U.J. (2009)
    This study was carried out to examine the possibility of using artificial neural networks as a tool to forecast droughts in Sri Lanka. Predictions were made using the Standardized Precipitation Index (SPI) as the drought ...
  • Lightning radiation field spectra of cloud flashes 
    Sonnadara, D.U.J.; Cooray, Vernon; Fernando, Mahendra (2004)
    Electric radiation fields produced by lightning cloud flashes have been Fourier analysed to obtain amplitude spectra for frequencies in the range of 20 kHz to 20 MHz. The spectra were generated by analysing the first 10ms ...
  • Using Optical Flow to Avoid Obstacles in Robot Navigation 
    Ileperuma, G.D.; Sonnadara, D.U.J. (2010)
    A virtual simulation was carried out as a pilot project to investigate the strength of optical flow in avoiding obstacles in robot navigation. The virtual environment allowed user to change parameters such as speed of the ...
  • Fuzzy Signal Light Control System for Pedestrian Crossings 
    Wannige, C.T.; Sonnadara, D.U.J. (2009)
    In this article, we bring forward a fuzzy signal light control system for Pedestrian Crossings with the scope of minimizing delay experienced by drivers and pedestrians at signal crossings. Here, we use a fuzzy logic system ...
  • Vehicle Counting and Classification from a Traffic Scene 
    Pancharatnam, M.; Sonnadara, D.U.J. (2008)
    This work was carried out to determine the performance of image processing techniques in classifying and counting moving vehicles in video streams of traffic scenes recorded by stationary cameras. The detection and tracking ...
  • Comparison of Projection and Wavelet Based Techniques In Recognition of Sinhala Handwritten Scripts 
    Nilaweera, N.P.T.I.; Premeratne, H.L.; Sonnadara, D.U.J. (2007)
    This paper presents a comparison between two methods which has high potential for offline Sinhala handwriting recognition. For simplicity, frequently used postal city names were used for performance comparison. The two ...
  • Vehicle Identification and Tracking using Images Sequence 
    Wimalaratna, L.G.C; Sonnadara, D.U.J. (2007)
    The real time measurement and analysis of various traffic parameters such as speed and number of vehicles are increasingly required in traffic control and management. Image processing techniques are now considered as an ...
  • A Neural Network Based Rainfall Forecasting System Using Multiple Stations 
    Weerasinghe, H.D.P; Premaratne, H.L.; Sonnadara, D.U.J. (2007)
    This paper presents an implementation of a robust neural network based rainfall forecasting system based on a cluster of weather stations in the dry zone of Sri Lanka. The implemented network was based on a Feed-forward ...
  • 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 ...

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