Nisabha Jayasundere

Nisabha Jayasundere
University of Ruhuna · electrical

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29
Publications
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406
Citations
Introduction

Publications

Publications (29)
Conference Paper
Full-text available
This paper presents a novel approach for Sinhala handwritten character recognition using a part based matching technique. The Sinhala character set consist of some common parts. Therefore the characters can be split into its parts. Each part in turn can be considered as an atomic element which these characters are composed of. The proposed method s...
Conference Paper
Full-text available
The pressure distribution in the sole of the human foot when interacting with a surface (ground) is termed plantar pressure, and is usually measured in the standing position. The plantar pressure distribution or profile is a strong function of the internal anatomy of humans. The profile can undergo changes due to the symptoms of some diseases such...
Conference Paper
Full-text available
Thermoelectric Coolers (TECs) are widely used in industry for refrigeration applications. Although, ample researches have been done on TECs, those are based on either modelling of TECs or applications of TECs. Hence, users find it difficult to gather required information of TECs when those are to be used in applications. This research is based on T...
Conference Paper
Full-text available
The paper proposes a GPS (Global Positioning System) tracking system for offshore fishing boats. The main objective of the proposed device is to minimize IUU (Illegal Unreported and Unregulated) fishing and develop sustainable fishing. There is a new demand in the world especially in Europe to import fish products only from sustainable fishing sour...
Conference Paper
The paper proposes a GPS (Global Positioning System) tracking system for offshore fishing boats. The main objective of the proposed device is to minimize IUU (Illegal Unreported and Unregulated) fishing and develop sustainable fishing. There is a new demand in the world especially in Europe to import fish products only from sustainable fishing sour...
Conference Paper
Full-text available
This paper proposes a Global Positioning System (GPS) tracking device for offshore fishing boats. The main objective of the device is to minimize Illegal Unreported and Unregulated (IUU) fishing for sustainable fishing as there are new regulations in the world, especially in Europe, to import fish products only from sustainable fishing sources. Thi...
Article
Full-text available
Secure Transmission of data from remote electronic devices to centralized web servers with the least amount of resources and handling big Data is a complex process. The integrity of data is questionable when transmitted through public transmission channels due to external attacks. Transmission of RAW data is also difficult at the client side to han...
Conference Paper
Full-text available
Sinhala is a language used by Sinhalese the major ethnic group in Sri Lanka. Most of the textual data gathered in Sri Lanka is in Sinhala language. Converting the data collected on handwritten papers in to digital format enables the automatic data retrieval and also many other advantages including editing, searching, distribution over a network. Th...
Conference Paper
Full-text available
The backscattering from partially water-filled cylindrical shells has been studied using finite element (FE) analysis and experimental measurements for low to medium frequencies, corresponding to 2 < ka < 30 (where a is the shell outer radius). For a partially-filled shell, filled to three quarters of the inner diameter, backscattering has been inv...
Chapter
Full-text available
The theoretical definition of the optimal sampling requirements has enabled us to identify key parameters (signal types, positioning accuracy) and a clear surveying strategy (line scans and rotation scans of particular targets, combination of imaging geometries). The scaled experiments complemented these with quantitative measurements, and enabled...
Article
Full-text available
The recent evolution in oceanographic sensing and platforms, including the availability of Autonomous Underwater Vehicles (AUVs), is encouraging the investigation of new high-resolution sonar concepts based on multistatic geometries. The rationale behind this concept is that multistatic systems, in particular if the geometry can be adapted with the...
Article
The acoustic scattering from a horizontal, partially fluid-filled, cylindrical shell has been studied as a function of the fluid level within the shell. The acoustic scattering characteristics were predicted using two Finite Element / Boundary Elements codes, PAFEC and CScat. The use of two different FE models assisted in the identification, and re...
Article
Full-text available
A 3 × 3 hydrophone array for low frequency applications was constructed from reticulated PZT ceramic foams. The hydrophone array was tested for receiving sensitivity and compared with single element PZT-air and dense PZT hydrophones. The composite array showed a flat response in the 20 kHz–100 kHz frequency range while the single element hydrophone...
Article
Full-text available
Toxic dumpsites on the seafloor are causing, increasing environmental concern, in particular around Europe. But a major obstacle toward realistic and quantitative risk evaluation at known dumpsites is the low efficiency of existing technology in determining the extension and location of objects buried in unconsolidated sediments. Funded by the Euro...
Article
An analytic expression is presented for the piezoelectric d constant of a binary piezoelectric 0‐3 connectivity composite. The expression is developed under the limiting assumption that the dielectric constant of the ceramic is much greater than the matrix. Predictions made using the theory compare very favorably with available experimental data. A...
Article
In this article an analytic expression is presented for the dielectric constant of a binary piezoelectric 0‐3 composite by modifying the well known Kerner expression [Proc. Phys. Soc. London Sec. B 69, 802 (1956)] to include interactions. The developed expression is a function of the constituent dielectric constants and their volume fractions only...
Article
Expressions for the scattered field of a radio wave diffracted by a vertical, rectangular, perfectly conducting plate on a perfectly conducting flat ground, when it is illuminated by a vertical current element at ground level, are derived in closed form for all azimuthal positions of the receiving point. Experimental confirmation of the results for...
Article
The recovery effect in homogeneous propagation, often referred to as sea gain, is analysed by means of the Compensation Theorem. The resulting solution takes the form of an integral equation, but in the particular case when the second medium is a perfect conductor a solution in simple integral form is possible. Numerical results applied to sea wate...
Conference Paper
Presents the results of an investigation carried out to develop microstrip body-mounted antennas designed to have an omnidirectional radiation pattern in azimuth, at a frequency within the 100-440 MHz range. Among the body-mounted antennas tested were a single rectangular patch microstrip antenna, an array of two rectangular patch antennas and a no...
Article
The electrical impedance characteristics of a piezoelectric disc are related to the mechanical resonance phenomena in the disc. The theoretical electrical impedance evaluated from the linear piezoelectric equations will only predict resonant properties for certain discs. In other discs additional ‘resonances’ occur due to the excitation of extra mo...
Chapter
The piezoelectric transducer is the electromechanical conversion element in NDE. Existing transducers of this type are found to impose limits on the improvement in system performance and, at present, there is a lack of standards as required for calibration procedures. Physical “standards” based on equivalent circuits have been produced which model...
Article
Full-text available
The backscattering from partially water-filled cylindrical shells has been studied using finite element (FE) analysis and experimental measurements for low to medium frequencies, corresponding to 2 < ka < 30 (where a is the shell outer radius). For a partially-filled shell, filled to three quarters of the inner diameter, backscattering has been inv...

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