ERU - 2010

Permanent URI for this collectionhttp://192.248.9.226/handle/123/14687

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Now showing 1 - 20 of 85

item: Conference-Extended-Abstract
A New prosodic phrasing model for sinhala language
(2010) Bandara, WMC; Lakmal, VMS; Liyanagama, TD; Bulathsinghala, SV; Dias, G; Jayasena, S
This paper describes a new model of predicting prosodic phrase breaks in Sinhala language in order to improve the quality of the existing ITS Sinhala voices. In a Text To Speech (TTS) system, quality of the synthetic voice is mainly dependent on, how well its prosodic model is implemented The prosodic model adjusts the phrasing and the pitch of the voice while applying suitable durations and tones for words and diphones. Out of these, phrasing and pitch of the voice carries much importance since appropriate phrase breaking helps to clearly understand the synthesis voice. In a real world scenario, when we speak a sentence, we automatically divide it to small segments and apply pauses at those breaks. Also the pitch of the voice gets lowered near a break and gels increased in the other segments automatically. But in a ITS system, we do not have that advantage and therefore need to be precised with the phrase breaks. Otherwise it will create wrong meanings as well as producing unnatural speech.
item: Conference-Extended-Abstract
A Study on present situation, construction procedures, sensitivity towards the fill height and possible failure scenarios of corrugated soil-steel bridges using PLAXIS
(2010) Gunathilaka, WMS; Shanaka, KBK; Lewangamage, CS; Jayasinghe, MTR
The Southern Highway Project introduced the technology of using Soil-Steel Bridges to Sri Lankan construction industry for the first time. Because of the fact that the technology is still new and less familiar, therefore, it is very important to look at the suitability of the Soil-Steel structures in the Sri Lankan context. The corrugated Sail-Steel Bridges hare been used as underpass and drainage structures in the Southern Highway Project. Corrosion of the metal structure highly depends on the soil types and the ground water conditions of the region where the structure is to be constructed. Already constructed soil-steel structures were closely examined in-order to collect the information on corrosion The loading and unloading procedures given in the guidelines are questionable and there is a need to establish proper guidelines for loading and unloading process for the safety during construction and while the structure is functioning. The actual construction sequence followed in the soil-steel structure construction was modelled using Finite Element Computer Modelling and the stresses and deformations of the structure were obtained. The stresses of the steel structure under different fill heights and the HA loading was also modelled using Unite element computer modelling: Using FEM model, possible failure scenarios n ere identified.
item: Conference-Extended-Abstract
A study on structural behaviour of corrugated soil-steel bridge structure (long span) in Southern highway for different depth of soil cover
(2010) Shanaka, KBK; Gunathilaka, WAS; Lewangamage, CS; Jayasinghe, MTR
Corrugated Soil-Steel Bridges have been used as underpass and drainage structures in the Southern Highway Project. This design and construction process is novel to the Sri Lankan context. The Ring Compression theory, which is based on two dimensional plain strain idealizations, has been used in the design of the structures. However due to the presence of the ring walls, the effect of uneven loading in the longitudinal direction due to load combinations of HA and HB loads, these assumptions are in question. The maximum and minimum depths of soil covers have been defined according to the results obtained by the Ring Compression theory. The effects of depth of cover in Soil-Steel bridges were evaluated using finite element computer modelling according to the US 5400 The original design results and the results of finite element analysis were compared. The structural stability of the existing bridges with respect to the different fill heights was determined. The Ring Compression and Finite Element Methods results are compatible for higher depth of covers The stresses of the steel structure for defined maximum and minimum depth of cover, at the ultimate limit state conditions are less than the crushing strength of the steel. Butt further buckling analysis should be considered because the corrugated steel structure vulnerable to buckling failure
item: Conference-Extended-Abstract
Alternative design of a geo textile weaving machine
(2010) Appuhamy, SG
Our objective of this project is to replace the manual processes which are used to produce geo textiles by a cost effective, reliable, automated geo textile producing machine with a cross rope moving mechanism, which will reduce the cost of production of geo textiles while increasing the overall production of this value added products.
item: Conference-Extended-Abstract
An assessment of the parameters used in snyder's method to derive unit hydrographs for small ungauged watersheds
(2010) Wijesinghe, WMD; Wijesekera, NTS
Snyder's Method was applied to the catchment of Welipenna Ganga, in order to study the variation of the results with the changes of the parameters used. Three vale of Cp were considered for the study while Ct was calculated with an equation given in literature. An average slope considering the highest and lowest points and a slope obtained considering segments along the main watercourse were used. The effect of using sub catchments was also taken into account. A considerable variation of final results was noticed with the selection of deferent alternatives.
item: Conference-Abstract
An experimental study on flexural strengthening of reinforced concrete beams using externally bonded FRP
(2010) Perera, PDR; Jayasinghe, MTR; Lewangamage, CS
The strengthening technique of Ffiber Reinforced Polymer (FRP) bonding externally is now established as a simple and convenient repair method for enhancing the flexural performance of concrete beams. In order to increase the stiffness and the flexural carrying capacity of beams under specific service conditions, FRP bonding has become very effective method. This paper presents the structural performances of FRP bonded beams. Experiment was conducted to find out the flexural strength increment which can he obtained by bonding F RP externally and identified the deflection pattern am! failure modes.
item: Conference-Extended-Abstract
An over view of water research and water related activities of its stakeholders
(2010) Bamunawala, RMJ; Rajapakse, RLHL; Wijesekera, NTS
Utilization of available water resources in needed to be optimized to meet the necessary capacity enhancements for future demands. In this context, water research plays a vital role, enabling rational decision making at national level. Present situation of said context is rather at poor level, thus leaving numerous concerns at researches. An over view of this situation is judicious for better utilization of effects and resources. Present situation of water research at national level was analyzed based on stakeholder points of view, recognized through a survey of explicit stakeholders. Responds were assessed to identify the efforts by different stakeholders as an aggregate value in a three step scale. The data can be further analyzed with a contribution based weight, so that a comparison can be made to indicate the difference of two indicators. Results of the survey showed, among other things, that the nation's present situation of water research is at a poor state, since 89.7% of the work related to surface water, 96.5% of the work related to climate changes and water and 98.9% of work related to water data and information are appear to being carried out without guidelines.
item: Conference-Extended-Abstract
Analysis and design of a low cost peak flow meter for asthma patients
(2010) Jayanath, SA; Imesha, E; Sudasingha, AN
Asthma cannot be completely cured and only the control can be achieved by proper medication. Peak Flow Meter (PFM) is an essential device which is used for initial diagnose and continuous monitoring of asthma. Affordable price is the main objective of the project therefore mechanical type methods were concerned. Based on that two conceptual designers ( Counter gravity & torsion spring) were proposed and variable orifice torsion spring design was selected as user friendliest design. Torsion spring design was modeled using SOLIDWORKERS and analyzed using ANSYS FLUENT. Analyzing past literature of several existing designs, geometry of the mouthpiece and diameter of the main flow path were selected same as the values of well known WRIGHT PFM as initial fixed parameters. Angular displacement of the baffle varied for range of 60l/min-800l/min peak expiratory floe rates to calculate torque acting on the baffle. Analysis results showed that the best angular displacement as 0-60 degrees and spring constant as 0.16Nm/rad. Calibration was carried out an a rapid prototype model by means of compressed air as the air supply source orifice place as the measuring technique.
item: Conference-Extended-Abstract
Application of analytical hierarchy process (AHP) for parameter identification in environmental resource modelling
(2010) Sooriyabandara, NN; Wijesekera, NTS
Use of Geographic information System (GIS) to determine the spatial availability of environmental resources is a very versatile method in any present level of practice. In this context, identification of environmental resources with respect to its potential becomes critical Properly aggregated resources, together with the spatial variation will be a meaningful representation of its slams for practical purposes. Therefore, an appropriate methodology to determine an aggregated weightage for environmental resources is critical AHP is one of the such tools, which is most commonly used in determining an aggregate value, based upon its parameters and parameter classes. Present study examines the spatial availability of dynamic environmental resources for conservation purposes together using GIS and AHP.
item: Conference-Extended-Abstract
Application of stormwater management modeling for ungauged watersheds in urban areas - a case study of the Matara municipal council area.
(2010) Harshani, HMD; Wijesekera, NTS
This paper is based on the studies of existing problems with regards to the storm water in Walgama area Matara Municipal Council and providing Engineering and Management options through a mathematical model EPA SWMM5. Several field visits were conducted to the study area in order to investigate the existing problems and collect the field data for model development. Model was verified with field survey data and the parameters observed \'odes and canal parameters were varied to identify' influence on output using most sensitive parameters, engineering options were proposed for storm water problems.
item: Conference-Extended-Abstract
Assessment of asphalt binder grading systems in hot mix asphalt pavements to Sri Lankan conditions
(2010) Mihirani, GS; Binduhewa, BWP; Lalithya, GDD; Mampearachchi, WK
Asphalt hinders are typically categorized according to the physical characteristic Traditional grading systems such as penetration and viscosity grading system and the new method. Super pave grading system are available currently. Method used in Sri Lanka is the traditional Penetration grading system which is about 100 years aid. A study relevant to the Sri Lankan conditions based on hinder grade affect on pavement performances, binder property variations and suitable asphalt hinder grades are carried out herein. A road investigation on pavement distresses is carried out to evaluate the pavement performances with the change of climate and the hinder grade used. The asphalt binders used for the road constructions in Sri Lanka are evaluated by analyzing the hinder properties. A questionnaire is conducted to evaluate the current industry practices. The suitable hinder grades for different areas of the country are identified then, according to the climatic conditions especially the Super pave prediction algorithms, used to convert the air temperatures into pavement temperatures are verified to Sri Lankan climatic conditions. The effect of binder grade on pavement distresses is identified through the road investigation Binder property analysis and the questionnaire show that industry does not maintain the standards properly. Also the requirement of different hinder grades for different zones is identified. Moving to a better hinder grading system while maintaining its standards and changing the binger grade with the climatic conditions according to the developed ArcGIS maps is recommended.
item: Conference-Extended-Abstract
Challenge response access control system
(2010) Dantanarayana, LIN; De Silva, KAST; Dharmasuriya, JSR; Dissanayake, HMAMB; Samarasinghe, ATLK
Security becomes o crucial port with the enhancements of Science and Technology. Physical Access Control plays a major role in leading security systems all around the world. Our target is to build a very secure Physical Access Control System considering accuracy, reliability and high speed operation. The product includes a Hand held device which is impossible to replicate, a wall console and a report logging server with logging databases. Scalability, redundancy and failsafe capabilities of the system are implemented and tested.
item: Conference-Extended-Abstract
Co-channel interference mitigation in LTE systems
(2010) Kudavithana, DU; Nishad, IDDT; Rupasinghe, RANP; Ruwanthilake, MAD; Wavegedara, KCB
In emerging Long Term Evolution (LTE) systems, it is expected to reuse the same set of frequency subchannels in each and every cell as much as possible. This will result in high co-channel interference (CI), which degrades the system performance significantly. Hence CI acts as the main performance limiting factor Therefore in order to achieve high system performance, it is imperative to mitigate CI. In this research project we propose a turbo /iterative) receiver architecture, which consists of a soft symbol detector and a soft channel decoder, for the downlink of LTE systems. Moreover, a minimum mean squared error (MMSE) based soft symbol detector is developed to suppress the CI and cancel the co-antenna interference (CAI), which is used in the turbo receiver. In order to improve the performance further, the adaptive fractional frequency reuse (AFFR) coordination scheme is implemented. Using computer simulations, the performance of the proposed receiver is thoroughly investigated for the LTE downlink. The considerable performance improvement achievable using the proposed advanced receiver scheme and its low computational complexity, make it attractive for the implementation in future LTE systems
item: Conference-Extended-Abstract
Comparison of rational formula alternatives for streamflow generation for small ungauged catchments
(2010) Wijesinghe, WMD; Wijesekera, NTS
The suitability of the Rational Equation for the derivation of steam/lows for small ungauged watersheds is studied. A Unit Hydrograph can be derived using the peak discharge obtained from the Rational Equation and using unit depth of rainfall in calculating the Rainfall Intensity. Possible alternatives for selection of sub catchments. selection of a guideline to determine the Runoff Coefficients and the Time of Concentration were taken into account. A significant variation of the results was observed with the selected alternatives In order to select a better alternative comparison of generated streamflows with the observed values is required.
item: Conference-Extended-Abstract
Computationally efficient implementation of video rectification in FPGA fo stereo vision applications
(2010) Maldeniya, BS; Navvarathna, UDU; Wijayasekara., KU; Wijegoonasekara, WTUS; Rodrigo, R
In order to obtain depth perception in computer vision, one needs to process pairs of stereo images. This process is computationally challenging to be carried out in real-time, because it requires the search for matches between objects in both images. Such process is significantly simplified if the images are reflected. Stereo image reflection involves a matrix transformation which when done in software will not produce real-time results. But in stereo vision applications this features is very demanding. On the other hand, applying those transformations to the video frames is very restricted by real-time constraints. Therefore, the video streaming and matrix transformation are not usually implemented in the same system. Our product is a stereo camera pair which produces a rectified real time image output with a resolution of 320x240 at a frame rate of 15FPS and delivers then via 100-Ethernet interface. We use an Spartan 3E FPGA for real-time processing within we implement an image rectification algorithm.
item: Conference-Extended-Abstract
Critical evaluation on diesel vehicle emission testing program in Sri Lanka
(2010) Sugathapala, AGT; Bamunuarachchi, BADN; Wimalasekara, PC; Katugaha, RS
A study on air pollution and its adverse impact to the world is studied as literature surrey. The contribution by vehicles to the air pollution is studied in global and local scale. An evaluation was carried out on the existing vehicle emission testing program (VET) to identify the critical issues. The major issue is vehicles are unable to tolerate the effects of the maximum engine speed. Several trial tests have been carried out to identify the relationship between K factor versus he engine speed and a relationship has been developed to simulate the relationship. I sing the mathematical relationship it will be decided a K- value for intermediate levels of engine speed to carry out VET program in a more meaningful way. The result of the study is very useful in devising improved methodology for the VET program in Sri Tonka.
item: Conference-Extended-Abstract
Demonstration of application potential of stormwater management model for flood plain management-case study at Kotuwegoda, Matara, Sri Lanka
(2010) Wijesekera, NTS; Wanniarachchi, SS
Stream hydrology is highly affected by the dynamic behavior of the urban terrain due to urbanization In a pre-developed setting, much of the rainfall is absorbed by the surrounding vegetation, soil and ground cover. In a developed setting, the water balance changes and a disproportionate amount of rainfall becomes surface runoff and causes flash floods. These excessive volumes are caused by both the total amount of impervious cover as well as the rate at which the runoff is delivered to the stream. Kotuwegoda ungauged urban catchment at Matara Municipal Council is frequently subjected to storm water induced flooding. In this research, storm water flow of the existing channel network was modeled using mathematical model EPASWMM5. Research comprises three basic steps as Identifying the catchment parameters through field observation and Modeling. Using Arc GIS tool converting model output to flood inundation area. Verify the results using field observations and making flood plain management proposals.
item: Conference-Extended-Abstract
Design and analysis of an affordable spacer device for asthmatic patients
(2010) kumarathunga, V
Asthma is a chronic disease which cannot be cured, hut can be controlled with appropriate medication. Asthma medication mostly involves with DPI and MDl inhalers MDl inhaler is coupled with a spacer device W improve the drug inhalation. Design and improvement in affordability and performance analysis of the spacer device is the main objective of the project The geometric shapes of the spacer devices which have a great influence on its performance were modeled and ( IT) simulations were obtained for the existing devices. By analyzing the CFD simulation a new design was developed in order to reduce the stagnant area and to maximize the drug delivery I low patterns inside the newly developed spacer device were analyzed using CFD simulation and obtained results were used to validate the design. Proposed new design was finalized with higher performance and improved affordability
item: Conference-Extended-Abstract
Design and development of an electronic stethoscope for cardiac murmur identification
(2010) Prasanga, KD; Prasad, LB; Perera, WARP; Perera, KLN; Abeykoon, AMHS; Udawatta, L
Cardiac murmurs are the sounds produced by the abnormal passage of the blood flow inside the heart due to the diseased value of tissues. Identifying the type of the murmur can diagnose the cardiac pathology related to that particular murmur. This paper describes a researched digital stethoscope that can be used as a stethoscope as well as a murmur identification device. To capture the heart beat, a chest piece of a traditional stethoscope is used with a condenser microphone attachment. Then the signal is amplified and filters out the noise and sent to the microprocessor. At the processing module, amplifying is carried out and stores the sampled data if the data transmission is not being done. then the amplified data is transmitted to a central location using radio frequency transformer module to carry out the signal processing. If the user wishes, the signal processing can be done in the stethoscope itself since the microprocessor is in the stethoscope unit. Auto correlation has been used as the signal processing algorithm.
item: Conference-Extended-Abstract
Design and implementation of an inverted pendulum controller to be used as a lab trainer and a teaching tool
(2010) Mohamed, MLH; Malithi, GMS; Mudunkotuwa, SRH; Mannapperuma, MMAD; Abeykoon, AMHS
The inverted Pendulum is one of the most challenging and important classical problems of Control Engineering. This paper presents a solution to this inherently unstable problem. With the pendulum being mounted on a cart that is moved by a belt spread between two pulleys. An optical encoder and a potentiometer are used to feedback the cart position and the pendulum angular displacement. This digital control of the system is developed using a microcontroller. The user can turn the parameters of the system through a user interface panel and observe the system response through a Computer Interface. The apparatus is intended to be used as a teaching tool to demonstrate the effects of Proportional, Integral, Derivate controls separately as well as in combination, on control systems to engineering students and a practical was developed for this purpose.

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