Badulla, Sri Lanka

Uva Wellassa University
Badulla, Sri Lanka

Uva Wellassa University is a Sri Lankan National University. The university was established by government gazette effective 1st of June, 2005 in Badulla, Sri Lanka as the 14th national university of Sri Lanka. President Chandrika Kumaratunga established the university in 2007. The university officially opened by Sri Lankan president Mahinda Rajapaksa on 5th of August, 2009.It is the first all-entrepreneurial university in Sri Lanka. It differs from other Sri Lankan universities, as it is designed to provide essential skills and broad general education for all students, while providing the conceptual and methodological background and the training to obtain practical solutions for value addition to the national resources base of Sri Lanka. Wikipedia.

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Chandima T.D.K.D.,Uva Wellassa University | Kartheeswaran T.,Uva Wellassa University
2016 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2016 | Year: 2017

Cinnamon cultivation is the main income source of a set of areas in Sri Lanka. Peeling cinnamon is a complex task of the cinnamon harvesting process after identifying the matured cinnamon trees. Expertise knowledge is essential to identify matured trees using the traditional method. Otherwise, it may cause the wastage of cinnamon, by cutting immature cinnamon trees. This research addresses the automated system to recognize the matured cinnamon trees using image processing techniques which can be used to identify the matured cinnamon trees without any expert knowledge. All the trees that are selected to this study are more than three year old. Image preprocessing, algorithm selection and use the Speeded Up Robust Features (SURF) features to extract data from leaves and at last, prediction of the maturity level of cinnamon trees using Support Vector Machine (SVM) classifier are the main phases of this study. Hundred cinnamon trees were tested from two different farms and the system performed 68.0% accuracy for matured trees and 86.0% accuracy for immature trees. © 2016 IEEE.

Thambawita D.R.V.L.B.,Uva Wellassa University | Ragel R.G.,University of Peradeniya | Elkaduwe D.,University of Peradeniya
2016 IEEE International Conference on Information and Automation for Sustainability: Interoperable Sustainable Smart Systems for Next Generation, ICIAfS 2016 | Year: 2017

General Purpose Graphic Processing Unit(GPGPU) is used widely for achieving high performance or high throughput in parallel programming. This capability of GPGPUs is very famous in the new era and mostly used for scientific computing which requires more processing power than normal personal computers. Therefore, most of the programmers, researchers and industry use this new concept for their work. However, achieving high-performance or high-Throughput using GPGPUs are not an easy task compared with conventional programming concepts in the CPU side. In this research, the CPUs cache memory optimization techniques have been adopted to the GPGPUs cache memory to identify rare performance improvement techniques compared to GPGPU's best practices. The cache optimization techniques of blocking, loop fusion, array merging and array transpose were tested on GPGPUs for finding suitability of these techniques. Finally, we identified that some of the CPU cache optimization techniques go well with the cache memory system of the GPGPU and shows performance improvements while some others show the opposite effect on the GPGPUs compared with the CPUs. © 2016 IEEE.

Wimaladharma S.T.C.I.,Uva Wellassa University | Manjula Herath H.M.U.,Uva Wellassa University
2016 IEEE International Conference on Information and Automation for Sustainability: Interoperable Sustainable Smart Systems for Next Generation, ICIAfS 2016 | Year: 2017

The level of connectivity and accessibility of a university website and the amount of information it shares have become a competitive factor among the world universities. Nowadays, the World Wide Web considerably contributes in the presence of information of university websites. Due to the immense distribution of information over the World Wide Web, it has been a challenging task to measure the quality and the quantity of the information each university website shares. Therefore, measuring the web impact has become the most popular mechanism among the researchers. This study is to compare the significance of web impact of the state university websites in Sri Lanka based on the link analysis statistics obtained from well-known search engines, Google and Yahoo!. In this analysis the Revised Web Impact Factor, the ratio between the number of inlinks (external back links) and the number of web pages published in the website which are indexed by the search engines (not all pages of the website),was taken into account. The correlation coefficient between the rank of resultant Revised Web Impact Factors and Impact Factors taken from the Webometrics website derived by Cybermetrics Lab was calculated with the ninety percent of inference level. If an academic website increases its link density via Yahoo! Search engine, it is relatively significance for its Webometrics impact factor whereas Google indexing expresses less relevance for the Webometrics impact factor. © 2016 IEEE.

Thambawita D.R.V.L.B.,Uva Wellassa University | Ragel R.G.,University of Peradeniya | Elkaduwe D.,University of Peradeniya
2016 IEEE International Conference on Information and Automation for Sustainability: Interoperable Sustainable Smart Systems for Next Generation, ICIAfS 2016 | Year: 2017

The Aho-Corasick algorithm is a multiple patterns searching algorithm running sequentially in various applications like network intrusion detection and bioinformatics for finding several input strings within a given large input string. The parallel version of the Aho-Corasick algorithm is called as Parallel Failure-less Aho-Corasick algorithm because it doesnt need failure links like in the original Aho-Corasick algorithm. In this research, we implemented an application specific parallel failureless Aho-Corasick algorithm on the general purpose graphic processing unit by applying several cache optimization techniques for matching DNA sequences. Our parallel Aho-Corasick algorithm shows better performance than the available parallel Aho-Corasick algorithm library due to its simplicity and optimized cache memory usage of graphic processing units for matching DNA sequences. © 2016 IEEE.

Pathirana S.,Uva Wellassa University | Gajanayake C.,Gas Car Engine Tune up Center | Vithanage C.W.,Effective Solutions Pvt. Ltd.
Proceedings of the 2017 6th National Conference on Technology and Management: Excel in Research and Build the Nation, NCTM 2017 | Year: 2017

The paper presents the ideology, procedures followed in order to implement, and the experimental results of an electronic device developed to extend the functionalities of an Electronic Control Unit (ECU) employed in the automobiles equipped with Electronic Fuel Injection (EFI) technology. The EFI system is empowered with a computing unit, ECU. A key responsibility of a typical ECU is to manipulate the fuel delivery for efficient combustion to optimize the engine's performance while minimizing the fuel wastage and emissions. Further, it is expected to self-adjust to fulfill the above requirements relying on several input sensors including a feed-back sensor. But, due to various reasons the objective is not fully achieved, therefore need to be rectified time to time. The process is called EFI Tune-up. Sensor malfunction and decayed fuel injectors are the major reasons for the incapability of ECU to control the situation. The especially developed add-on module was designed to assist the ECU when it loses its tolerance because of decayed fuel injectors and once the feedback sensor is beyond its range of operation. The strategy followed was to modify the Injector Pulse Width, a Pulse Width Modulated (PWM) control signal generated by the ECU to regulate the fuel release of fuel injectors, based on an analysis done regarding the emissions containing in exhaust gas. The experimentally obtained evaluation records conclude that the involvement of the introduced add-on module could reduce the fuel wastage and release of toxic emissions up to 70%, depending upon the condition of the fuel injector. © 2017 IEEE.

Sirimanne P.M.,Uva Wellassa University | Perera V.P.S.,Open University of Sri Lanka
Optik | Year: 2016

Dyes and pigments absorb unique portion of visible light. Solvatochromic behavior and formation of monomers and aggregations are characteristics features of dyes. Several types of dyes and pigments have been employed to study sensitization process of TiO2|sensitizer|p-semiconductor type solar cells. An enhancement of efficiency of this type of solar cells could be expected by appropriate coupling of several dyes as a result of fully coverage of visible spectrum. A comparable study of multi dye systems was carried compare to that of mono dye systems. © 2016 Elsevier GmbH.

Jayasena D.D.,Chungnam National University | Jayasena D.D.,Uva Wellassa University | Jo C.,Seoul National University
Food Reviews International | Year: 2014

This review provides an overview of the published data on the antioxidative potentials of common essential oils and their components that could be considered suitable for application to meat and meat products. The positive effects of essential oils from oregano, rosemary, thyme, sage, basilica, ginger, and others, when used alone or in combination with other essential oils and/or as a part of hurdle technology to extend product shelf life by controlling lipid oxidation and improving the sensory qualities of meat and meat products, are well documented. Phenolic constituents of many of these essential oils act as free radical scavengers and hydrogen donators that prevent lipid oxidation. © 2014 Copyright Taylor and Francis Group, LLC.

Jayasena D.D.,Chungnam National University | Jayasena D.D.,Uva Wellassa University | Jo C.,Seoul National University
Trends in Food Science and Technology | Year: 2013

Production of safe and high quality meat and meat products along with recent consumer's demand for all-natural and clean-label is challenging. Plant-derived essential oils (EOs) have shown remarkable antimicrobial potency against spoilage and pathogenic microorganisms in meat and meat products. In this review, basics of microbial deterioration of meat and meat products and traditional preservation methods used are first discussed followed by mode of action and scope of application of EOs for these products. Application of EOs is partially limited due to their intense aroma but advanced technologies can be combined to improve both the microbial stability and sensory quality. © 2013 Elsevier Ltd.

Herath H.M.S.K.,Massey University | Herath H.M.S.K.,Uva Wellassa University | Camps-Arbestain M.,Massey University | Hedley M.,Massey University
Geoderma | Year: 2013

Improving soil physical properties by means of biochar application has been proposed in recent publications. The objective of this study was to investigate to what extent the addition of corn stover (CS) and biochars produced from the pyrolysis of corn stover feedstock (CS) at 350 and 550°C temperatures (CS-350, CS-550) affected aggregate stability, volumetric water content (θV), bulk density, saturated hydraulic conductivity (Ks) and soil water repellency of specific soils. Organic amendments (CS, CS-350, CS-550) were incorporated into a Typic Fragiaqualf (TK) and a Typic Hapludand (EG) soils at the rate of 7.18tCha-1, which corresponded to 17.3, 11.3 and 10.0tbiocharha-1 for the CS, CS-350 and CS-550 treatments, respectively. After 295d of incubation (T295), soils were sampled as (i) undisturbed samples for bulk density and Ks; and (ii) mildly disturbed samples for θV (at -15, -1, -0.3, -0.1, -0.08, -0.06, -0.04, and -0.02bar), aggregate stability and soil water repellency. The θV at time 0 (T0) was also determined at -15, -1 and -0.3 matric potentials for the different treatments. Biochar application significantly increased (P<0.05) aggregate stability of both soils, the effect of CS-550 biochar being more prominent in the TK soil than that in the EG soil, and the reverse pattern being observed for the CS-350 biochar. Biochar application increased the θV at each matric potential although the effect was not always significant (P<0.05) and was generally more evident in the TK soil than that in the EG soil, at both T0 and T295. Biochar addition significantly (P<0.05) increased the macroporosity (e.g., increase in θV at -0.08 to 0bar) in the TK soil and also the mesoporosity in the EG soil (e.g., increase in θV from -1 to -0.1bar). Both biochars significantly increased (P<0.05) the Ks of the TK soil, but only CS-350 biochar significantly increased (P<0.05) the Ks in the EG soil. Biochar was not found to increase the water repellency of these soils. Overall results suggest that these biochars may facilitate drainage in the poorly drained TK soil. However, the present results are biochar-, dose- and soil-specific. More research is needed to determine changes produced in other biochar, dose and soil combination, especially under field conditions. © 2013 Elsevier B.V..

Yaghini N.,Chalmers University of Technology | Pitawala J.,Uva Wellassa University | Matic A.,Chalmers University of Technology | Martinelli A.,Chalmers University of Technology
Journal of Physical Chemistry B | Year: 2015

We report on the effect of water on local structure and phase behavior of two protic ionic liquids, C2HImTFSI and C2HImTfO. Raman and infrared spectroscopy are employed to investigate the local coordination state. We find that water interacts weakly with TFSI- while more speci fically with TfO- through the -SO3 group. Additionally, we observe that upon addition of water the -NH stretching frequency does not change in C2HImTFSI, while it red-shifts in C2HImTfO, indicative of different hydrogen bonding configurations. Supported by the appearance of some additional features in the 800-1000 cm-1 frequency range where ring out-of-plane bending (γ) modes are found, we hypothesize that in C2HImTFSI water interacts only with the cation coordinating to the ring C2H and the N3H sites, while it interacts with both cation and anion in C2HImTfO forming hydrogen bonds that involve the cationic N-H site as well as the anionic -SO3 group. These different local structures also reflect in the phase behavior investigated by DSC, which reveals a more homogeneous solution when water is added to C2HImTfO, as compared to H2O/C2HImTFSI mixtures. Finally we report that the addition of water also significantly affects both Tm and Tg. (Chemical Equation Presented). © 2014 American Chemical Society.

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