ERU Research Symposium 2011: Accepted Papers

Please note that an oral presentation must be made at the symposium, in order for a paper to be considered accepted.

71
Miyaesi: A System for Automatic Music Transcription
Hasitha Abeykoon (University of Moratuwa) Shahani Weerawarana (University of Moratuwa) Najla Akram (CSE-UOM) Thilanka kaushalya (CSE-UOM) Asanka Dissanayaka (CSE-UOM) Chathura Silva (University of Moratuwa)
Music notations can be considered as very important information for musicians as well as for music fans. To recreate music which was heard before, one has to know the musical notes which were included in that music recording. For many years computer scientists and engineers have tried to come up with various techniques to automate the task of finding out musical notes from a music recording. Many digital formats which facilitate storing and encoding of music information exist. Many statistical methods have been proposed in literature. But implementation specific detail is very scarce. With this paper we try to address that issue. In this research study, we have implemented a system to systematically address the challenges in performing automatic music transcription.
Status: Accepted for Oral Presentation
62
Application of Genetic Algorithm to optimize Cut-order Planning solutions in Apparel industry
Ranga Abeysooriya (University of Moratuwa) TGI Fernando (University of Sri Jayawardenapura)
The fabric cutting process acts as the second major cost contributor of the apparel manufacturing process due to the high expenditure on marker making, fabric spreading and cutting, which is about 5-10% of the total manufacturing cost. Researchers highlight that an effective cut order plan results in reducing the abovementioned cost factors of cutting process, thereby reducing the entire manufacturing cost to a greater extent. This study aims on optimizing the cut order plan solutions using Genetic Algorithm (GA) principles. An optimization algorithm is proposed based on GA principles and the computer-based program was introduced to execute the algorithm, under MATLAB environment. The performance of proposed algorithm is compared with respect to the available methodologies of generating cut-order plans available in Sri Lankan Apparel industry.
Status: Accepted for Oral Presentation
2
Effect of Reflux Temperature on Synthesis of Hydroxyapatite by Wet Chemical Precipitation Technique
Sudarman Adikary (University of Moratuwa) Nayana Jayaweera (University of Moratuwa) Asha Sewvandi (University of Moratuwa)
In this study, hydroxyapatite HA, [(Ca10(PO4)6(OH)2)] was synthesized using wet chemical precipitation technique at different reflux temperatures. Calcium hydroxide [Ca(OH)2] powder and Phosphoric acid [H3PO4] solution were used as starting materials. Variation in PH value of Ca(OH)2 suspension during the addition of H3PO4 solution was analyzed. The effect of reflux temperature for the synthesis HA was investigated. Characteristics of synthesized powder were analyzed by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The powder characteristic has demonstrated that, the reflux temperature played an important role in the synthesis of pure and single phase HA powder.
Status: Accepted for Oral Presentation
10
Effect of Deacetylation Conditions on Synthesis of Chitosan using Shrimp type “penaeus monodon”
Sudarman Adikary (University of Moratuwa) Bandu Samarasekara (University of Moratuwa) Janitha Unagolla (University of Moratuwa) Ruchindra Wijesinghe (University of Moratuwa)
In this study synthesis of chitosan from shrimp type penaeus monodon and effect of degree of deacetylation conditions were studied. Chitin was extracted from shrimp shells and deacetylation process was done to synthesize chitosan under different conditions. Characterization of the synthesized chitosan was done using Fourier Transmission Infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The effect of NaOH concentration, reaction temperature, and reflux time on the deacetylation process was investigated. Degree of deacetylation of chitosan was determined using infrared spectroscopy technique. Mainly, the increasing of NaOH concentration, temperature, number of deacetylation time and reflux time can enhance the degree of deacetylation (DD) of chitosan.
Status: Accepted for Oral Presentation
33
Effects of Clay Characteristics on Fabrication and Glazing Behavior of Ceramic Products from Tissamaharama Red Clay
Sudarman Adikary (University of Moratuwa) Sanjeewani Jayawardena (University of Moratuwa) Upali Gunawardena (University of Moratuwa)
In this research work, clay deposits located at Tissamaharama region was investigated for mineralogical characteristics and to identify suitable fabrication and glazing techniques. The samples were collected from a site where clay mining is been already done for the pottery industry. X-ray diffraction (XRD) analysis, differential thermal analysis (DTA) and chemical analysis were used to determine the mineralogical characteristics of the clay samples. XRD and DTA analysis of the clay samples showed the presence of Quartz, phyrophyllite and montmorillonite. Chemical analysis indicated the presence of CaO, Fe2O3, SiO2 and Al2O3. The Tissamaharama clay belongs to montmorillonite-kaolinite group with calcareous material and hence this clay could not be effectively deflocculated. Therefore slip-casting technique is not possible as a fabrication technique. Alternatively hand throwing on the potter’s wheel or jiggering could be effectively used as a fabrication method. The actual size samples, made by hand throwing on the potter’s wheel exhibited good properties. For fabrication of glazed red clay items, it was observed that the coefficient of thermal expansion of clay was lower than commercially available leadless low maturing glazes. However by adding sufficient amount of quartz to the clay, coefficient of thermal expansion can be improved.
Status: Accepted for Oral Presentation
36
Sugarcane bagasse pith as a low cost adsorbent for the removal of Methylene Blue from wastewater
Padma Amarasinghe (University of Moratuwa) Chaminda Senarathna (Pelwatte sugar Industries PLC)
Adsorption of methylene blue dye onto sugarcane bagasse pith from Pelwatte Sugar plant was studied to enable comparison with alternative commonly available adsorbents. Batch experiments were conducted to determine the effect of adsorbent dose, initial dye concentration and to obtain equilibrium data. Sugarcane bagasse pith is capable of binding appreciable amounts of methyl blue dye from aqueous solutions. The equilibrium data were satisfactorily fitted to Langmuir and Freundlich isotherms. Highest dye uptake of 40 mg/g was observed. Fixed bed column experiments were performed to study practical applicability and breakthrough curves were obtained. Breakthrough curve data fits to Yoon-Nelson model and bed capacities for methylene blue adsorption was 22 mg/g.
Status: Accepted for Oral Presentation
44
Cross Domain Authentication with OpenID for Web-Services
Suresh Attnayake (University of Moratuwa) Shyameni Wijekoon (University of Moratuwa) Hemal Mahagederawatte (University of Moratuwa ) Dilan Wijenayake (University of Moratuwa) Prabath Siriwardena (WSO2 Lanka (Pvt) Ltd. ) Gihan Dias (CSE-UOM)
Cross domain authentication for web services is important when web services in one organization are accessed from another. This paper presents the implementations of cross domain authentication in web service environment with OpenID. OpenID integration for web-services enables authentication to web-services regardless of the domains requester and resource provider belong to. It enables wider use of web-services among users since OpenID has become quite popular. It also enhances the security aspect in web service authentication, since it eliminated the use passwords for authentication between requester and resource provider.
Status: Accepted for Oral Presentation
70
Traffic Light Coordinator- Synchronization between Traffic Light Controllers Using Dynamic Phase Selection, Timing Calculation and Area Coordination
J. M. S. J. Bandara (University of Moratuwa) A.T.L.K. Samarasinghe (University of Moratuwa) Dinithi Namarathne (University of Moratuwa) Ruwani Munasinghe (University of Moratuwa) Pavithra Madurangi (University of Moratuwa) Maheshi De Silva (University of Moratuwa)
The Area traffic light coordinator has developed targeting to reduce high traffic congestion in Sri Lanka by synchronizing traffic light controllers using dynamic phase selection and timing calculation with area coordination. The software program which runs on the traffic light controllers, gets the vehicle density input needed to calculate timing from a database, which should be updated dynamically using a sensor network. Calculated timing and phases are then rearranged to suit with junction structure and using those, synchronization not only within the junction, but also throughout the critical path is achieved.
Status: Accepted for Oral Presentation
65
AI techniques for decision making systems: A survey
Thisum Buddhika () Pivithuru Wijegunawardana (University of Moratuwa) Danushka Jayamanne () Mr. Chulaka Gunasekara () Shehan Perera (University Of Moratuwa )
Accurate Decision Making is a key aspect of a successful business organization. Manual decision making has become exceedingly difficult because of the availability of large data volumes and business complexity. This survey paper is intended to identify different technologies that have potential to be used in decision making systems, analyze current approaches which utilize those technologies and discuss advantages and disadvantages in using them for decision making in travel industry. The main decision making technologies involved in this paper are Artificial Neural Networks, Decision trees and Neuro-fuzzy systems.
Status: Accepted for Oral Presentation
94
FPGA Implementation of Normalized Cross-Correlation for Real-time Template Matching in Dynamic Search Windows
Amila Cabral (University of Moratuwa) Ajith Pasqual (University Of Moratuwa)
In computer vision cross-correlation is a standard approach for local feature matching in feature tracking applications. For this Normalized cross-correlation (NCC) is implemented on spatial domain, because it does not have a simple and efficient frequency domain expression. Therefore in applications which demand real-time processing,a dedicated hardware implementation of NCC is essential to meet the computational cost in spatial domain. In this paper we present a Field Programmable Gate Array (FPGA) implementation of NCC based on the multi-port memory controller together with Fast Normalize Cross-correlation. Practical experimentation shows that our system can achieve frame rates closer to 100 for a search window size of 100x100 and template size of 15x15, with only using two dual-port memories.
Status: Accepted for Oral Presentation
3
Real time Stereo Vision Based On Biologically Motivated Algorithms Using GPU
Thusitha Chandrapala (University of Moratuwa) Jayathu Samarawickrama (Department of Electronic and Telecom Engineering, University of Moatuwa)
Although many recent stereo vision algorithms have been able to create disparity maps with high accuracy, because of the sequential nature it is difficult to adopt them for real time applications. Biologically motivated algorithms involving Gabor filters demonstrate inherent parallelism and could be effectively implemented in parallel hardware such as Graphics Processing Units(GPUs). We present a real time stereo vision algorithm based on Gabor filters which effectively use the memory hierarchy and the threading resources of the Graphics Processing Unit(GPU). Since the 2D filtering process is a critical activity which takes upto 50% of the total time to create the disparity map, we evaluate the GPU implementation of three filtering methods. Using the optimal filtering method out of them, we were able to achieve a frame rate of 76 fps for a 512x512 image stream on a NVIDIA GTX 480 GPU, and a 170x speed-up compared to the conventional CPU based implementation.
Status: Accepted for Oral Presentation
90
Hardware Implementation of Motion Blur removal
Thusitha Chandrapala (University of Moratuwa) Sapumal Ahangama () Thilina Ambagahawaththa () Amila Cabral () Jayathu Samarawickrama (Department of Electronic and Telecom Engineering, University of Moatuwa)
Motion Blur due to the relative motion between the camera and object can seriously degrade image quality. We present an FPGA based blur detection and correction algorithm which is implemented on top of a configurable soft-processor based architecture. The system consists of two main modules. The blur detection module identifies the blur length and angle, and the restoration module uses regularized inverse filtering to remove the blur. The Processing algorithms are implemented as separate cores on the FPGA fabric where the soft processor core is only used for managing system configuration. The system can achieve a frame rate of 15fps for a 720p HD video stream.
Status: Accepted for Oral Presentation
48
Plagiarism Detection Framework using Text Mining Techniques
Udana Costa (University of Moratuwa) Nuwan Seneviratne (University off Moratuwa) Kasun Jayasinghe () Isuru Wijesinghe () Mr. Chulaka Gunasekara () Malaka Walpola ()
With the rapid growth of internet resources and document processing tools, Plagiarism can be identified as a growing problem specially in the academic field. Here we present a methodology which allows users to witness an accurate and feature rich open source plagiarism detection framework. We mainly used two main approaches in this system to detect plagiarism. This include String comparison algorithms which consists of copy-paste plagiarism as well as paraphrase plagiarism detection to detect plagiarism among documents and query based online source detection algorithms to detect internet plagiarism . Here we also describe the main modules of the system and the comparison with the existing techniques as well.
Status: Accepted for Oral Presentation
37
Security Issues of Virtual Machine Residues
Kushan Dayananda (University of Moratuwa) Chandana Gamage (Computer science & Engineering)
Enterprises consistently seek innovative approaches to reduce operational computing costs while getting the most from their resources. Recent advancements of virtualization technologies play a major role in helping the organizations to reduce the operational cost, and still ensure improved efficiency, better utilization and flexibility of existing hardware. Virtualization technologies also provide a compelling approach to enhancing system security, offering new ways to rearchitect todays systems and opening the door for a wide range of future security technologies. However these technologies still possess severe security risks to its adopters due to the nature of shared resource utilization which make them a rich target for malicious individuals. Among these security risks, virtual machine residues based attacks become increasingly commonplace as a method of profiling/extracting peer’s confidential information. In order to cope with these risks, appropriate taxonomies and classification criteria for residues based attacks on virtualization are required. This paper investigates virtual machine residues based attacks and describe the security exposure to residues of VM in virtualized environments.
Status: Accepted for Oral Presentation
22
Use of ANN in Risk Analysis
Nayanthara De Silva (University of Moratuwa) Malik Ranasinghe (University of Moratuwa)
Artificial Neural Network (ANN) has been used for risk analysis in various applications such as civil engineering, financial, facilities management and so on. However use of ANN has become extremely difficult when the problem is complex when handling large number of variables. Ensemble network architecture is proposed to overcome such difficulty, by combing individual “expert networks” that learn small parts of the problem. In this research, ANN was used to analyze risks in maintainability of high-rise buildings. Analysis of maintainability risks of a building involves a large number of variables as it consists with number of components such as roof, façade, etc., Therefore use of a single neural network has become impossible due to small set of data from less number of high-rise buildings in Sri Lanka. Therefore, ensemble network architecture was used in this research. The results showed that ensemble network has performed well in solving complex problems (i.e. building), by decomposing the task of the problem into its sub levels (i.e. components).
Status: Accepted for Oral Presentation
85
Sensing Line-of-Sight Obstructions in a Multipath Radio Environment
Dileeka Dias (University of Moratuwa) Rakhitha Chandrasekara () Lanka Wijesinghe () Prasanga Siriwardena () Prasad Sampath () Ruwini Edirisinghe ()
The paper presents the development and the experimental verification of a technique for the identification of obstructions in the line-of-sight path between two or more radio transceivers in a multipath radio environment. The objective of this technique is to use RSS measurements from a mesh of simple sensor nodes to identify intrusions.
Status: Accepted for Oral Presentation
4
The Failure Mechanism and Bearing capacity of Different types of Shallow Foundations
Nissanka Fernando (University of University) Laddu De Silva (University of Moratuwa) Eranga Sendanayake (University of Moratuwa) Dulan Sendanayake (University of Moratuwa)
The development in analysis and design of shell type foundations have led to the understanding that there are more advantages of shell type foundations compared to their conventional flat counterparts. The bearing capacities of conical and pyramidal shell foundations on dry sand were determined in the present paper by conducting laboratory model tests. The results were compared with those of circular and square flat foundations, respectively. Four foundation models on dry sand were tested in which influence of the shell configuration on the bearing capacity and settlement were investigated. The present experimental study indicated admirable performance of shell type foundations with respect to ultimate and settlement characteristics. Also characteristic of deformations or the failure mechanism of both shell and its flat counterparts were simultaneously investigated by using colored and non-colored sand layer by layer in dry sand model.
Status: Accepted for Oral Presentation
52
SeMap – Mapping Dependency Relationships into Semantic Frame Relationships
Nirmal Fernando (CSE, UoM) Nisansa de Silva (CSE, UoM) Chamilka Wijeratne (CSE, UoM) Danaja Maldeniya (CSE, UoM) Shehan Perera (University Of Moratuwa ) Ben Goertzel (OpenCog Foundation)
We describe the refactoring process of the RelEx2Frame component of OpenCog AGI Framework, a method for expanding concept variables used in RelEx and automatic generation of a common sense knowledge base specifically with relation to concept relationships. The well-known Drools rule engine is used instead of hand- coded rules; an asynchronous concurrent architecture and an indexing mechanism are designed to gain performance of re-factored RelEx2Frame. WordNet aided supervised learning mechanism is applied to expand concept variables. Association mining is used on semantic frames acquired through processing an instance of Wikipedia in order to generate a common sense knowledge base.
Status: Accepted for Oral Presentation
74
Influence of Varying Supply Yarn Package Diameter on the Pirn Winding Tension
Shehan Fernando (UoM) T. S. S. Jayawardena (Department of Textile and Clothing Technolog Engineering, University of Moratuwa) Sandun Fernando (UoM)
Pirn winding is an operation of winding yarn from supply yarn package onto pirns which are used for shuttle weft insertion. As the package size varies when winging pirns, the varying balloon effect caused to change the thread tension at the winding point of the pirn. As a number of pirns can be wound from a single supply yarn package, pirns are wound from different yarn package diameters. A significant change in take off tension takes place from pirn to pirn. Placing dead weights on the disc tension controller which adds a tension to take off tension may help to compensate the yarn tension variation to some extent. However, incorrect timing of compensation and stepwise compensation may create significant tension variations in pirn windings. The authors attempted to design a tension control device by applying an automatically continuously varying electromagnetic force on the dead weight, so that the variation of take off tension due to change of package diameter is compensated and investigate influence of varying supply yarn package diameter on the final winding tension of pirn.
Status: Accepted for Oral Presentation
79
Effect of parboiling method on the physical properties of parboiled paddy
Manisha Gunasekera (University of Moratuwa) Charika Ariyasena () KKR Jayakody ()
Some important physical properties of paddy necessary for designing grain processing equipment namely, size and shape, thousand grain weight, bulk density, true density and angle of repose at moisture content of about 15% d.b. for raw paddy LD 365, a red rice variety were determined. These properties were also determined for the same variety of paddy after parboiling using cold soaking method at moisture content of about 29% d.b. and using hot soaking method at moisture content of 17% d.b. When comparing raw paddy, cold soaked paddy and hot soaked paddy, the thousand grain weight varied as 15.56g, 16.47g and 15.32 g respectively. Bulk density was 585.92, 576.4 and 539.32 kg/m3 respectively where, true density was 1183.61, 1177.32 and 1097.92 kg/m3 respectively. Porosity varied as 50.50%, 51.04% and 50.88% and the variation of angle of repose was as 33.690, 39.240 and 38.070 respectively.
Status: Accepted for Oral Presentation
84
Traffic Induced Vibration Analysis of Existing Steel Bridge in Padeniya-Anuradhapura road
Prabhavi Gunathilake (Civil Engineering- UoM) Tharindu kodikara (Civil Engineering) Uditha Morawaka (Civil Engineering) C. S. Lewangamage (University of Moratuwa)
The bridge which is located in Padeniya-Anuradhapura road is a steel truss bridge with three spans of approximately 31m long. It is currently undergoing a development process which includes constructing a new cantilever pedestrian walkway of 1.5m in length of either side of the bridge. Because of this proposed cantilever foot walk static as well as dynamic loading will be changed. In order to ensure that the structure is safe under the additional loads structural analysis was carried out for static condition as well as for dynamic condition and check the adequacy of structural elements. Analyses of the bridge under static and dynamic loading were done by the finite element (FE) method. The bridge model is such that the structural steel is idealized by beam elements and the deck is represented by shear flexible shell elements. The support with elastomeric bearings is idealized by using an internal element with linear springs. Modeling was carried out using commercial FE software package SAP2000. Based on the results of finite element analysis this paper suggests the effectiveness of using elastomeric bearings for enhancing vibration serviceability hence expanding life span of steel truss bridges.
Status: Accepted for Oral Presentation
42
The potential of nailed all timber box beams
Premini Hettiarachi (University of Moratuwa) Kalani Welhena (University of Moratuwa) Chandraratna Pottewela Gamage (University of Moratuwa) Prabodha Priyadarshana (University of Moratuwa)
The potential of combining small dimension timber with timber webs of suitable thickness has been demonstrated by of this experimental investigation on nailed built up timber box beams of different cross sectional profiles in which the flanges and webs are entirely of timber. No literature was available on such timber box beam construction. The effect of web thickness, overall depth, and shape of flange on the load carrying capacity and flexural rigidity of timber box beams were investigated. Timber beams consisting of webs of 25 mm thickness and overall depth of 225 mm were shown to be the most cost effective. The profile of the flange does not appear to have a significant effect on either the load carrying capacity or flexural rigidity. No attempt was made to model the nail deformation on either the load capacity or the flexural rigidity. Rather, analytical studies showed that the load capacity of the 225 mm deep built-up all timber box beams are approximately 30% and their flexural rigidity is in the range of 25% to 40% that of an integral hollow timber section of identical dimensions. Thus at first glance, the advantage of built up beams of these dimensions may seem questionable. However, considering the fact that integral hollow sections of these dimensions are not available and that there is value addition to the small dimension timber sections whose capacity in bending as solid timber sections acting alone is very small, the all timber built up box beams have immense potential.
Status: Accepted for Oral Presentation
50
Effect of different sugar sources on Bacterial Cellulose production
Marliya Ismail (University of Moratuwa) Sulashi Samarasinghe (Department of Chemical and Process Engineering, University of Moratuwa) Malshan Peiris (Department of Chemical and Process Engineering, University of Moratuwa) Kasun Withana (Department of Chemical and Process Engineering, University of Moratuwa) Thilina de Alwis (Department of Chemical and Process Engineering, University of Moratuwa) Sasikala Premalal () Rohan Chinniah (Department of Microbiology, Faculty of Medicine, University of Colombo) Ajith de Alwis (Sri Lanka Institute of Nanotechnology, Biyagama)
The production of bacterial cellulose by Acetobacter xylinum in coconut water medium by four carbon sources (glucose, fructose, mannitol, sucrose and trehalose) at four pH levels (3.5,4.0,4.5,5.0) was examined. Controller gave the highest cellulose level followed by mannitol, fructose, trehalose, glucose and sucrose at pH 5.0. The results show that carbon source does not play a major role on the production of BC in coconut water medium. However medium pH has a considerable effect in achieving high productions of BC.
Status: Accepted for Oral Presentation
14
Reduce stress, BCI based communication tool designed for disables for use in daily life
Shamil Jauffer (IIT) Nuwan Dayananda (University of Moratuwa)
Moving a brain-computer interface (BCI) system from a laboratory demonstration to a consumer oriented real-life applications still possesses severe challenges to the BCI community. This study, aims in discovering a new augmentative communication channel that does not rely on the brains normal output pathway of peripheral nerves and muscles, thus as a result patients with Neuromuscular diseases, could rapidly and seamlessly communicate with the outside world. The study makes use of a commercially available single channel, wireless EEG with Bluetooth enabled acquisition that is cost effective. The results obtained after evaluation of the software shows its performance at an excellent speed and therefore the use of the reduce stress approach seems to have a great impact in reducing the stress level of a patient in the process. This demonstrated a truly portable, cost-effective and a practical implementation of an alternative communication channel created for patients with Neuromuscular disorders.
Status: Accepted for Oral Presentation
40
Development of Semi Autonomous Blimp UAV for Civil Applications
Dileepa Karunarathna (University of Moratuwa) KTMU Hemapala (University of Moratuwa) Chatura Jayawardena (University of Moratuwa) Isuru Jayawardena (University of Moratuwa) Bhatheindra Vishwajith (University of Moratuwa)
This paper describes the design and development of semi autonomous Blimp based UAV for civil applications. Given that little research had been carried out in Sri Lanka about blimp based UAV, this also seeks to establish a design and development platform for further research and development on the subject and also edify the engineering community about prospective benefits of Unmanned Aerial Vehicles most of which are unexploited so far. The project mainly consists of a design phase, construction and implementation in which authors are at the moment, and testing and improvement phase where attempt to realize the ultimate goal of a commercially viable “green blimp” with integrated organic photovoltaic cells and GPS module which can further be developed into fully autonomous Blimp.
Status: Accepted for Oral Presentation
97
Hardware Assisted IP Stack
Rajika Prethap Kotagodahetti (University of Moratuwa) Nadun Ellawala (University of Moratuwa) Nuwan Koggalahewa (University of Moratuwa) Dasun Kehelwala (University of Moratuwa) Ajith Pasqual (University Of Moratuwa)
TCP/IP performance improvement is a major concern in low latency network applications. The network interface speed is a significant factor to be concerned on, when working with applications that require high speeds such as datacenter applications in cloud computing environments. This paper presents on the processing speed improvement of the IP layer of the TCP/IP stack. This will be mainly realized through hardware implementation of the IP layer functions. The system is implemented on a FPGA based hardware platform. Our Main objective is to study about the achievable performance gains by implementing a scalable hardware based IP layer.
Status: Accepted for Oral Presentation
83
Structural Assessment and Rehabilitation Option for Yudaganawa Dagoba in Buttala
Shyamini Kularathana (University of Moratuwa) Dhanushka Siriwardhana (University of Moratuwa) Nuwan Sudharshana (University of Moratuwa) C. S. Lewangamage (University of Moratuwa)
Structural Assessment and Rehabilitation Option for Yudaganawa Dagoba in Buttala H.G.S.R.Kularathna, D.N.T.M.Siriwardhana, W.N.Sudharshana and C.S.Lewangamage Abstract Yudaganawa dagoba in Uva province is one of the largest stupas in Sri Lanka which dates back to 2nd century BC. Presently, this colossal stupa with a diameter about 91.2 m is undergoing several issues which necessitate it to be rehabilitated. The stupa was found in ruins and grown with vegetation until it has been preserved by subsequent restoration efforts in the recent past. However, it is not standing at its original height well-matched with the circumference at its base. Further, existing formation of the structure, existing foundation and ground condition are unknown. This paper presents structural assessment of existing stupa and proposal for rehabilitation. A literature survey has been carried out to investigate the structural formation of stupas in ancient Sri Lanka. The geometry of the present stupa and the soil profile under the stupa were assessed. Soil and material properties are found with adequate laboratory testing. Present condition was modeled using finite element analysis with the help of SAP 2000 and PLAXIS. Based on the results, several alternative methods are proposed for rehabilitation and the options are analysed with respect to structural performance along with the existing condition and the religious beliefs, attitudes and rituals concerning the stupas. Keywords: Ancient Stupas in Sri Lanka, rehabilitation, Finite Element Analysis
Status: Accepted for Oral Presentation
43
“e-Arogya” – An Economically Feasible e-Health Solution for Sri Lankan Government Hospitals
Kapila Lanerolle (University of Moratuwa) Gerad Niroshan (University of Moratuwa) Ureka Wijekoon (University of Moratuwa) Chamendri Silva (University of Moratuwa) Shahani Weerawarana (University of Moratuwa)
Sri Lanka is one of the very few countries in the world that provides free health care to all the citizens. Since Sri Lankan health care institutions are non-profit institutions, acquisition of new technologies and new systems is almost impossible because of the financial barrier. “e – Arogya” is our solution to this problem. It is developed using a Service Oriented Architecture (SOA), leveraging open source and using Health Level 7 (HL7) open standards. This paper explores the possibilities achievable for the introduction of ICT in the Sri Lankan health care system, the problems faced in the process and the proposed solution with use of open source software, and open standards in health care.
Status: Accepted for Oral Presentation
78
Banana Fiber Extraction and use as a Filler in Natural Rubber Compounds
Senali Lokubalasooriya (University of Moratuwa) Shantha Egodage (University of Moratuwa) Jagath Premachandra (University of Moratuwa)
In this study Banana Fibers were extracted using three methods and advantages/drawbacks are discussed according to the yield, time consuming, quality and properties of banana fibers obtained by each method. Three parts of banana tree (i.e. stem, mid rib and leaves) of two different types of banana trees (i.e. Seeni kesel and Aana maalu) have been analysed. Two series of Filled Natural Rubber compounds were prepared changing the filler loading from 0-10 phr using Banana Fiber and Carbon Black as fillers and physical properties were examined. Tensile strength, elongation at break decreased with the addition of fibers while Carbon Black series has shown the opposite. Hardness increased with both banana fiber and Carbon Black Loading. It is expected to enhance the surface interactions between the banana fiber and the Natural Rubber through surface modification, in order to improve the properties of the resulting compound.
Status: Accepted for Oral Presentation
76
Automated Management Information System for Vehicle Maintenance and Repair Workshop
Meharuban Mahadeva (CSE, University of Moratuwa) Haritha Tennakoon (CSE, University of Moratuwa) Shantha Fernando (CSE) Ravith Silva (Motorlink Holdings)
In a regular vehicle maintenance and repair workshop, service details, employee details and invoice details are manually maintained in paper and hence prone to human errors. Further, the customer is required to provide vehicle details and customer information each time a customer comes to get a service from the workshop. During the time the vehicle is the vehicle is in the workshop, lot of details need to be collected from the labourers and supervisors, which are then manually entered in to systems. Accurate accounting and billing, the assessment of the actual labour cost, assurance of timely attendance to the issues and monitoring the progress are issues. The objective of this eMIS project is to automate such tasks. eMIS minimizes the manual entries thereby minimizing the human errors, ultimately leading to customer satisfaction. The automation of the eMIS system is achieved using RFID technology based solutions. eMIS provides subsystems to manage the proper use of spare parts, employees of the workshop and their attendance to tasks, and remote monitoring by the management as well as customers. eMIS system is currently being tested in a real environment.
Status: Accepted for Oral Presentation
93
Multiple Object Tracking with a Surveillance Camera System
Thanuja Mallikarachchi (Department of Electronic and Telecommunication, University of Moratuwa) Tharindu Bandaragoda (University of Moratuwa) Chammi Dilhari (University of Moratuwa) Chathurangi Kumarasinghe (University of Moratuwa) Jayathu Samarawickrama (Department of Electronic and Telecom Engineering, University of Moatuwa) Ajith Pasqual (University Of Moratuwa)
Increasing use of CCTV for city and building surveillance has given rise to an environment where an object (a person) might traverse through the ?eld of view of many cameras. In this paper we explore the problem of multiple objects tracking in a multi camera environment, which is a highly addressed area in computer vision. Our research involves tracking objects while they are moving in a multi camera environment with non-overlapping ?eld of views and detecting them when they re-appear in the same or another camera in the same system. Previous methods of using of?ine trained classi?ers with huge databases are time consuming and have the drawback of incapability of detecting arbitrarily selected objects. Therefore we employ online training with the initial sample given. The closest work to our approach is presented by Zdenek Kalal where he presents the TLD(Tracking, Learning, Detection) framework for a single object in a single video stream. We extend the idea to formulate our methodology to create a framework that can track multiple objects in multiple video streams. We have developed upper layers as a thread based architecture in order to incorporate multiple video feeds and to handle multiple objects in upper layers. We have integrated CUDA(Computer Uni?ed Device Architecture) programming model to add parallelism to independent processes.CUDA offers an ideal computing environment to improve our framework. Our tracking module presents a signi?cant increase in performance in such a way that multiple objects are tracked in multiple video streams with a 12ms processing time per frame.
Status: Accepted for Oral Presentation
21
Capacitance Method Based Handheld Device to Measure the Moisture Content of Static Grains
Ashanthi Maxworth (University of Moratuwa) Kapila Jayasinghe (University of Moratuwa)
Quality of the grains depends on the internal moisture content. Capacitance method was used to determine the moisture content of static grains with accuracy of ±0.9%. This paper represents the characteristics and operation of a handheld device which was made to give real-time moisture content readings based on the capacitance of the grains with the above accuracy for paddy.
Status: Accepted for Oral Presentation
51
deBas: A Sinhala Interactive Voice Response (IVR) System
Johann Nallathamby (University of Moratuwa) Rasika Kariyawasam (University of Moratuwa) Hasitha Pullaperuma (University of Moratuwa) Dilum Vithana (University of Moratuwa) Sanath Jayasena (University of Moratuwa)
Although there are widely used Interactive Voice Response (IVR) systems in many languages today, there is no Sinhala language IVR system yet. This paper talks about deBas IVR: a complete Sinhala IVR with automatic speech recognition (ASR) and text-to-speech (TTS) synthesis modules that work in compliance with Media Resource Control Protocol (MRCP). It discusses some background literature, the process taken, the overall design and implementation aspects and the future work that can be carried out in this area. In the ASR component, training the acoustic model is done with SphinxTrain, and decoding with PocketSphinx, which are based on Hidden Markov Models (HMM). In the TTS component, AMoRA Sinhala TTS knowledge base is used, which uses Festival speech synthesis engine and a female diphonic voice, built using Festvox voice building tools. Asterisk is used as the IVR gateway and dial-plan interpreter. MRCPv2 protocol has been followed in developing the speech resources, which uses Session Initiation Protocol (SIP) for establishing controlled connections to external media streaming devices and Real time Transport Protocol (RTP) for media delivery. The language model of the ASR component has been restricted to digits from 0-9 that are commonly used in IVR systems and the set of words used for our demo application. The Word-Error-Rate and the Sentence-Error-Rate of the ASR component are reported to be 31.4% and 54% respectively, as observed in our experiments. In addition to these, we also introduce a new intonation model that can be applied to any existing Sinhala diphonic voices.
Status: Accepted for Oral Presentation
11
Introduction of native vegetation on cut slopes as an erosion protection in the Southern Highway, Sri Lanka
Udeni Nawagamuwa (University of Moratuwa)
The landslides which occur due to the soil erosion and the mass movement have become one of the natural hazards faced by Sri Lanka today. The improper human activities and the carelessness have also caused to occur the landslides which affect widely on the loss of human lives, the destruction of property and the environment. Although the hilly area is usually categorized as the landslide prone area, the Southern part of the country has faced the slope failures and the erosion problems time to time. As a stabilization of slopes using mechanical structures is costly to establish and maintain, biotechnical slope protection is an alternative which is more aesthetically pleasing and cost effective. Hence, in this research, an overall study about the positive impacts of the presence of native vegetation for the slope stability is studied in the manmade slopes of the Southern Highway. Recently, it could be noticed that the importance of the slope stability because of few slope failure in the cut slopes from Kottawa to Dodangoda. This paper explores the effect of the native vegetation in the cut slopes with different slope angles of the Southern Highway by identification, categorization and studying of the salient features of them according to the soil classification for relevant slope by using both Unified Soil Classification System and US Department of Agriculture. This research recommends suitable native vegetation against soil erosion and subsequent slope failures in cut slopes.
Status: Accepted for Oral Presentation
68
InterAct:A Framework for Generating User Interfaces for Web Services
Harshani Nawarathna (University of Moratuwa) Pavithra De Alwis (University of Moratuwa) Galle Hettiarachchig Dilhara (CSE) Sanjaya Liyanage (University of Moratuwa) Shahani Weerawarana (University of Moratuwa)
InterAct is a form based framework for designing User Interfaces (UI) by non-technical users. It can be used to design UIs for multiple device platforms. The framework mainly consists of two parts, an Integrated Development Environment (IDE) and a conversion library. The designed UIs are saved in an xml format. These user sketches are then converted into HTML pages which can be displayed in various devices using the conversion library. Data is bound to the UI elements at runtime. Usability is the major concern of the InterAct. This aspect is addressed by applying the best practices of Human Computer Interaction (HCI) in order to provide the user a better experience.
Status: Accepted for Oral Presentation
39
Influence of Cement Fineness on Properties of Cement Mortar
Chathuri Nissanka (University of Moratuwa) Senani Nelundeniya (University of Moratuwa) Indika Ratnayake (University of Moratuwa) S. M. A. Nanayakkara (University of Moratuwa)
This experimental work has focused on investigating the influence of cement fineness on properties of cement mortar which can be easily related to properties of concrete. Experiments were conducted with four samples of Ordinary Portland Cement having four different fineness values 400m2/kg, 370m2/kg, 330m2/kg and 300m2/kg. It was ensured that the chemical composition was identical for all samples by using same clinker in manufacturing those cement samples. Also it was ensured that except cement fineness all other variable factors such as water/cement ratio, cement/sand ratio, size of the aggregates, curing conditions and method of compaction were kept constant for all samples throughout the experiments. Compressive strength, tensile strength, initial setting time of cement, drying shrinkage, sorptivity and delayed etringite formation were the main properties that were taken in to consideration in investigating the influence of cement fineness. This investigation revealed that there is an effect on properties of concrete from cement fineness. Also it was observed that these effects can be positive or negative due to increase of cement fineness. Therefore the paper concludes with a discussion of future developments and recommendations of defining minimum as well as maximum Blaine limits.
Status: Accepted for Oral Presentation
57
Automated Teleprompter
Srimal Paris (University of Moratuwa) Tharindu Weerakoon (University of Moratuwa) Charitha Waravita (University of Moratuwa) Niranjan Udayanga (University of Moratuwa) Chathura Silva (University of Moratuwa)
This project is focused on automating the current manual teleprompting system to achieve higher usability. Teleprompting is one of the most widely used techniques in many broadcasting systems. Nowadays, it is handled manually by a person. Our purpose is to automate the teleprompting scenario, so that less manual intervention is needed to operate the process. The project mainly consists of two sections; Teleprompter Automation and Graphical implementation for sign language to illustrate the speeches for the handicaps.
Status: Accepted for Oral Presentation
28
Investigation of Cracks Developed in Dematamal Viharaya, Buttala
Suganya Paskaran (Department of Civil Engineerin) Manori Perera (Univesity of Moratuwa) M. T. R. Jayasinghe (Univesity of Moratuwa)
Dematamal Viharaya of Buttala is one of the oldest Stupas in Sri Lanka built in the 2nd Century BC. It is a 18m tall non-plastered brick structure. This Stupa has developed some cracks in the recent past. Cracks have initiated from the Pesawalalu to the top of the Dome. The research covered in this paper was aimed at the identification of the causes for the cracks and to propose corrective actions. A comprehensive study was carried out to identify the possible causes for the cracks which may be due to settlement of the foundation, expansive nature of soil, self weight of structure or the separation of the old and new parts of the Stupa. A detailed analysis was carried out using SAP2000.The results revealed the possible cause can be the contraction of the old brick work beneath the new brick work and the discontinuity between them. Based on the identified causes corrective actions have been proposed.
Status: Accepted for Oral Presentation
41
An analysis of BPMN 2.0 as a Business Process Execution Language
Umashanthi Pavalanathan (University of Moratuwa) Eranda Sooriyabandara (University of Moratuwa) Keheliya Gallaba (University of Moratuwa) Ishan Jayawardena (University of Moratuwa) Vishaka Nanayakkara (University of Moratuwa) Milinda Pathirage (WSO2 Inc.)
The use of process modeling concepts in business scenarios enables designers to specify process requirements in terms of interactions, enacted by human agents. Inter-operation of Business Processes at the human level, rather than the software engine level, can be solved with the standardization of the Business Process Model and Notation (BPMN). BPMN 2.0 is a step forward for the whole business process management community because it introduces not only a standard graphical notation, but also concise execution semantics for process execution, that can be used to enable the real execution of business processes which are modeled using it. In this paper, we analyze BPMN 2.0 standard with regard to its expressiveness as a Business Process Execution Language and propose an implementation of a native BPMN 2.0 execution engine using Apache ODE’s JACOB framework.
Status: Accepted for Oral Presentation
24
Development of an empirical model of a helically coiled steam generator for waste heat recovery
Kapila Perera (University of Moratuwa) Ranjan Perera (University of Moratuwa) Manoj Ranaweera (University of Moratuwa) Kasun Rajapaksha (University of Moratuwa) Lakshitha Premathilake (University of Moratuwa) Mahesh Hewa Bettage (University of Moratuwa)
Discussions are going on today in many forums analyzing correlations between engineering applications and environmental pollutions. As a result of that, novel concepts such as green engineering have appeared in the engineering scenario. This paper describes a procedure developed for designing a helically coiled steam generator (SG) for recovering heat from the flue gas of a furnace. The design was applied to the lead melting furnace operating at Associated Battery Manufacturers(Ceylon) Ltd (ABM), Ratmalana, Sri Lanka. Most available literature deals with experimental investigations regarding correlations for heat transfer coefficients and pressure drops in helically coiled heat exchangers for both single phase and two phase flow regions. The paper presents a systematic procedure for designing a helically coiled SG through this case study.
Status: Accepted for Oral Presentation
81
Feasibility Study on Solar Photovoltaic Office Air Conditioning in Sri Lanka
Eshan Perera (University of Moratuwa) Lochana Kollure (University of Moratuwa) Sandun Prasad (University of Moratuwa) Kapila Perera (University of Moratuwa) Ranjan Perera (University of Moratuwa) Dasun Perera (University of Moratuwa)
Due to the rapid depletion of fossil fuel resources and global concern on Green House Gas emissions, sustainable energy technologies have become important in Heating, ventilation and Air Conditioning (HVAC) systems in buildings. As a result, much focus is given on research and application based on solar powered HVAC, in various parts of the world. Such initiatives are of timely importance in Sri Lankan context due to the availability of good solar energy potential. In this work, an existing air conditioning system for an office building of 51m2 in Sri Lanka was taken into study. An economic evaluation was performed using HOMER (Version 2.68 beta) to assess the feasibility of using Solar PV (SPV) to power the air conditioning system. The results show that under present circumstances, the Levelized Cost of Energy (COE) of the optimized photovoltaic stand alone system lies far above that of the grid powered. It further depicts that grid integration would bring down the COE of the SPV system closer to the range of the main grid. Hence in current conditions, grid integration is the way forward for SPV assisted air conditioning in Sri Lanka.
Status: Accepted for Oral Presentation
35
Finite Element Modelling of Deformation Characteristics of Soft Soils in Colombo OCH Project
U.G.A. Puswewala () W. N. R. P. N Nilminie (RDA)
This work presents a numerical simulation of the deformation of the earth embankments and soft soil underlying the Colombo Outer Circular Highway. Finite Element analysis software Plaxis 8.2(2002) is used to model the long-term creep deformation behavior of soft soil loaded by embankments, with pre-fabricated vertical drains installed in the soft soil strata. Two constitute models are used for the analysis; Mohr-Coulomb Model to represent the earth embankment and Soft Soil Creep model to simulate the soft sub soils. The actual three-dimensional problem domain is converted to an equivalent two-dimensional plane-strain domain. All field conditions including the load incrementing sequences are simulated, and coupled consolidation/creep analysis is performed to predict the settlement behavior. Numerical predictions are compared with observed field settlement records, and agreement is seen between the predicted results and the observed field measurements, indicating the feasibility of using the numerical model for predicting purposes. Key words: Soft soil, creep deformation, finite element simulation, constitute model
Status: Accepted for Oral Presentation
27
Development of a 2DOF Lower Extremity Exoskeleton Robot
Kasun Rajapakse (University of Moratuwa) Suluxon Kunam (University of Moratuwa) Mindika Perera (University of Moratuwa) Thilina Lalitharathne (University of Moratuwa) Ruwan Gopura (University of Moratuwa) KTMU Hemapala (University of Moratuwa)
The development of a lower extremity exoskeleton robot has always been an interesting research topic in the field of rehabilitation, in which the human intelligence and machine power is combined together to enhance the power of human being. The exoskeleton robot can assist or rehabilitate the people who are disabled or physically weak. Especially in the Sri Lankan context, there is a necessity to develop exoskeleton robots because of having so many war causalities looking for rehabilitation. This paper describes the design concept and simulation of a 2 degree of freedom lower limb exoskeleton robot.
Status: Accepted for Oral Presentation
16
Identifying the safe and efficient way of removing Lead acid battery terminals from battery cap for recycling Lead
Manoj Ranaweera (University of Moratuwa) Rashindu Mendis (University of Moratuwa) Gayan Dassanayake (University of Moratuwa) Yashanka Patabandige (University of Moratuwa)
A significant portion of the Lead requirement for manufacturing Lead acid batteries in Associated Battery Manufacturers (Ceylon) Limited, the only battery manufacturer in Sri Lanka, is taken from recycling old batteries. At the moment the primary separation of Lead parts from the other parts of the battery is done manually. Thus this process suffers from the unavailability of skilled labors to remove battery terminals as the removal of terminals from the battery cap is the most difficult part done manually. Besides, the health risk to the operators is also quite significant. Therefore, a Semi- Automatic Battery Terminal Removing Machine was developed to overcome the above issues. This paper describes the experimental process of identifying optimum methods for above process.
Status: Accepted for Oral Presentation
49
Geotechnical Investigations on Earth dams in Sri Lanka. Unnichchai Dam as a case study
Chamila Rankoth (University of Moratuwa) Dayani Sanjeewani (University of Moratuwa) Sudeera Sampath (University of Moratuwa) Laddu De Silva (University of Moratuwa)
Sri Lanka is a country where there are large numbers of earth dams. Most of them are suffering partial failures due to excessive seepage, piping, excessive lateral deformations etc. But limited investigations have conducted on the performance of earth dams from the geotechnical point of view. This paper draws attention to some of the possible failure mechanisms based on steady state seepage, rapid draw down, and response due to an earthquake by analysing a set of computer based models of Unnichchai earth dam. The main objective is to evaluate the risk of failure for above mentioned mechanisms. The analysis revealed that the factor of safety against rapid draw down condition and in steady state condition is lying closely for selected conditions and fairly high enough to obtain good performance. Behaviour of the dam under seismic loads was analysed using computer models and manual methods and showed acceptableable factor of safety against liquefaction. When overall result is considered it can be stated that the Unnichchai earth dam is performing well under normal conditions prevails in Sri Lanka.
Status: Accepted for Oral Presentation
12
Low Cost Eye Tracking System: Detection of Pupil Centre and Corneal Reflection
Asanka Rodrigo (University of Moratuwa) D P Nagasinghe () K A M N Pathiratne () C D Pathirawasam () W G Pawithra () A P A Perera ()
This paper discusses a method of implementing the detection of pupil centre and corneal reflection for a low cost, remote eye tracking system that is designed for usability analysis researches. The method we have used to measure the eye gaze is tracking corneal reflection and the pupil centre of the eye, where the paper focuses on how those features are tracked from a video input that have captured the subjects’ eye movements. The method suggested here is capable of tracking the pupil centre even from an eye with less colour contrast between the pupil and the iris and also endures head movements of the subjects. The test results are included in terms of accuracy of the method to the changes in point of gaze and distance between the computer screen and the user. The limitations of modern eye trackers and possible solutions are also addressed in this paper.
Status: Accepted for Oral Presentation
13
Extraction of Photo activators Using Natural Resources to Develop Photodegradable Polymer Products
Padma Samarasekara (University of Moratuwa ) K.H.R. Sajeewani (University of Moratuwa ) H.D.G. Sumudumalie (university of Moratuwa)
Photodegradable polymer products are developed to control the plastic waste generation and better for the environment. These polymers can break down through the action of ultraviolet (UV) light, which degrades the chemical bond or link in the polymer and chemical structure of the polymer. This process can be assisted by the presence of UV-sensitive additives (photo activators) in polymer. Here, Photo activators were extracted from natural resources like rue leaves, spearmint leaves and Illmenite. The extracted products were analysed and characterized using Fourier Transform Infrared Spectroscopy (FTIR), Iodoform test and chemical analysis. These extracted photo activators can be used to develop photodegradable polymer products in a cost effective manner to save the environment.
Status: Accepted for Oral Presentation
31
Utilization of Fruit Waste to Produce Biodegradable Polymer Composites
Padma Samarasekara (University of Moratuwa ) D. Kumarage (Department of Materials Science and Engineering, University of Moratuwa ) S Piyathlake (Department of Materials Science and Engineering, University of Moratuwa )
Polymers play an essential and ubiquitous role in everyday life due to their extraordinary range of properties. However, Polymer wastes create formidable problems to the society today. Biodegradable polymers are significant and of great importance for the future of the planet. Biodegradation is the decomposition of polymer materials by microorganisms. Biodegradable Low Density Polyethylene (LDPE) based composite was prepared by adding pectin as the main additive. Pectin was extracted using fashion fruit waste. The biodegradability imparted by pectin can be improved by incorporating natural enzymes. Papain and Bromelain were two natural enzymes extracted from fruits of papaya and pineapple waste. The extracted products were analysed and characterized using Fourier Transform Infrared Spectroscopy (FTIR). These extracted natural enzymes can be used to produce biodegradable LDPE – Pectin polymer composite to preserve the environment for future generations.
Status: Accepted for Oral Presentation
100
Augmented Reality for Mobile Devices to show information of exhibits at a Museum
Kasun Sandaruwan (UoM) H.M.C.M.B. Abeysinghe () V. P. Jayasiri () W.M.B.S. Wijerathna () Ajith Pasqual (University Of Moratuwa)
Augmented Reality (AR) is one of the emerging technologies being used for enhancing user experience in many applications. Specific devices for various tasks are been replaced by Smart Phones making them a unique platform to implement all functionalities in one device. In this paper we present a real-time AR framework for mobile devices that takes into consideration key technical challenges such as limited processing power and battery life. The framework is having four separate modules, Marker Detection, Identification, Camera pose calculation and Embedding visual information. A 2D pattern called a marker is used to uniquely identify the objects. The marker in the camera view is detected and tracked so that information contained in the marker is exploited. Tracked four corners of the marker are used to calculate the 6 DOF of camera position, which is further processed to place 3D graphics on the real scene with accurate rotation and translation. To demonstrate the capabilities of our AR Framework we have developed an application for iPhones, which highlights significant information in exhibits.
Status: Accepted for Oral Presentation
96
Disease Detection System from Heart Sounds
Mathuranthagaa Selvarathnam (University of Moratuwa) sewwandi Perera (University of Moratuwa) Afra Muthalif (University of Moratuwa) rukshani Liyanaarachchi (University of Moratuwa)
This paper presents a methodology to diagnose heart diseases which can be identified using heart sounds. As the first stage, audio files in .wav format are acquired using an electronic stethoscope and entered to a database with patient symptoms. Then prominent features and statistical parameters needed for disease detection are extracted from the heart sound samples using an algorithm. Extracted features are used as the input to the neural network that is trained to classify heart disorders. Patient’s heart sound file and symptoms can be given to the developed software for analysis to find out the diseases.
Status: Accepted for Oral Presentation
34
Site Suitability Analysis for Groundwater Recharging Structures in Hambantota District by Using Remote Sensing and GIS Techniques
Indishe Senanayake (University of Moratuwa) U.G.A. Puswewala () D.M.D.O.K. Dissanayake (University of Moratuwa)
The dry zone of Sri Lanka faces drought conditions periodically, due to the rainfall variations over the island. Hambantota District in Sri Lanka appears to be a highly affected area from these drought conditions on the basis of surface water availability. This situation can be worse in the future, with the climatic changes in the world and human interference with the nature. Hence, a proper water management system, including preservation of existing surface and groundwater resources as well as recycling, is a must to overcome this problem. Rainwater harvesting is practiced throughout the world, as a solution to this problem. Groundwater consists of 30.1% of the freshwater resources in the earth, while surface water consists of only 1.3%. Hence recharging the runoff to the groundwater table is an effective method in rainwater harvesting. Integrating remote sensing and GIS techniques with relevant data can provide an updated, reliable database which is a pre-requisite for designing a proper water management system with dramatic saving of time. In this work, Suriyawewa District Secretariat Division was selected as the project area, considering its location within Hambantota District and its average climatic conditions. The suitable locations to recharge the runoff into groundwater table were found out by integrating land use, climatic, soil, stream and slope data of Suriyawewa with Remote Sensing and GIS techniques. This methodology can be generalized to Hambantota District and can be applied to other areas in the dry zone of the island.
Status: Accepted for Oral Presentation
38
Development of Fly Ash Based Geopolymer Concrete
Vimarsha Silva (University of Moratuwa) Chinthaka Wijewardena () Jinith Kithalawa Arachchi () S. M. A. Nanayakkara ()
This paper describes the research carried out to develop a geopolymer concrete based on alkali activated Fly Ash by Sodium Hydroxide with Sodium Silicate . Tests were carried out to investigate the properties of geopolymer paste, mortar and concrete varying different parameters to obtain optimum mix proportion. Higher values of compressive strength was recorded for all three forms compared to Ordinary Portland Cement concrete within a lesser time period and results indicated that the higher water content within all three forms had an adverse impact on the compressive strength. Even with these advantages the main drawback was the curing method and the curing time which was essential for the polymerization process and it was found out that only half of the compressive strength of the heat cured sample was achievable when it was kept under room temperature for 28 days. Most of the results were very promising and showed a great potential for this material as a substitute for Ordinary Portland Cement concrete.
Status: Accepted for Oral Presentation
30
Strengthening of reinforced concrete slabs using fiber reinforced polymer (FRP)
Abarna Sivarajah (University of Moratuwa) Anushka Abeysinghe (University of Moratuwa) C. S. Lewangamage (University of Moratuwa) Malith Lakshitha (University of Moratuwa)
This paper presents the potential use of externally bonded fiber reinforced polymer (FPR) systems to upgrade reinforced concrete slabs deficient in flexural strength. A total of five slabs, each having 500 mm width, 125 mm thickness, and 1530 mm length, were cast and tested to failure under four-point bending. Two slabs were reinforced with three number of 10 mm tor steel bars at the tension side that corresponds to 0.38% steel reinforcement ratio. One slab was used as a control whilst the other slab was strengthened with fiber reinforced polymer (FRP). Other three slabs were reinforced with four number of 6 mm mild steel bars at the tension side that corresponds to 0.18% steel reinforcement ratio. One slab was used as a control specimen while the other two slabs were strengthened with different arrangement of fiber reinforced polymer (FRP). In the experimental stage, the influences of the reinforcement and FRP on the slabs were analyzed by studying their behaviour at failure. Keywords: Flexural; Reinforced concrete slabs; Strengthening; Fiber reinforced polymer (FRP)
Status: Accepted for Oral Presentation
86
An Investigation on Relationship between Third Party Logistics User and Provider at FMCG Industry in Sri Lanka
Ranil Sugathadasa (TLM- UM) Saranga Rajapaksha ()
The aim of this research is to investigate the relationship between Third Party Logistics (3PL) user and provider at Fast Moving Consumer Goods (FMCG) industry in Sri Lanka from the users’ perspective. The empirical research is used to investigate the user satisfaction on • Information technology in terms of using web enabled communication, IT based customer order management and IT based distribution management • Supply chain security in terms of providing physical security for material goods, providing information security and monitor environmental conditions associated with shipments • Green supply chain practices in terms of improving transportation efficiency and thereby reducing carbon emission, reducing the use of non recyclable materials and using energy efficient distribution centers. And it further investigates as to how information technology, supply chain security and green supply chain practices are affecting to the level of relationship between third party logistics user and provider. The results showed that 3PL users are satisfied with the above three factors provided by the 3PL providers in Sri Lanka. With the high level of satisfaction, these factors are affecting to the relationship between 3PL user and provider. The results of this study provide useful information especially for 3PL providers to improve their services. Providers can be aware of the most frequently used services, the potential trends so that they can develop their capabilities for the future requirements.
Status: Accepted for Oral Presentation
19
Development of energy labelling programme for domestic water pumps in Sri Lanka
Thusitha Sugathapala (University of Moratuwa) Ranjan Perera (University of Moratuwa) Nuwan Mirando (University of Moratuwa) kalpana madhushan (University of Moratuwa) Kasun Kaluarachchi (University of Moratuwa)
To reduce the energy consumption in domestic sector, Sustainable Energy Authority of Sri Lanka is considering implementing energy labelling programs for household electrical appliances. The main objective of the energy labelling program is to provide guidelines to users to select the best appliance rather than following the brand names without knowing their performance levels at the same time encouraging manufacturers to go for the optimal designs. This paper discusses about the performance indices that can be used for the energy labelling program for domestic water pumps which suits for Sri Lanka.
Status: Accepted for Oral Presentation
53
Siddhi-CEP - High Performance Complex Event Processing Engine
Sriskandarajah Suhothayan (University of Moratuwa) Loku Narangoda Isuru (University of Moratuwa) Chaturanga Subash (University of Moratuwa) Gajasinghe Kasun (University of Moratuwa) Perera Srinath (WSO2) Vishaka Nanayakkara (University of Moratuwa)
Complex Event Processing (CEP) is one of the most rapidly emerging fields in data processing. Processing of high volume of events to derive higher level events is a vital part of several business applications including; business activity monitoring, financial transaction pattern analysis, and row RFID feeds filtering. The tasks of the CEP is to identify meaningful patterns, relationships and data abstractions among unrelated events, and fire an immediate response such as an alert message. In this paper, we address the need of a scalable, generic complex event processing engine, which was designed focusing on higher performance to process events in an efficient manner, with added advantage of a permissive open-source license. The implementation and design of different features have been carried out along with testing and profiling in order to be certain about the performance Siddhi CEP can provide.
Status: Accepted for Oral Presentation
73
Investigation on Suitability of Cohessionless soil as a Highway Construction Material
Sahan Tharaka (University of Moratuwa) Suvetha Balasubramaniam (University of Moratuwa) Chathurika Ransinghe (University of Moratuwa) Wasantha Mampearachchi (University of Moratuwa) H. S. Thilakasiri (University of Moratuwa)
Major parts of the Eastern and Northern provinces of Sri Lanka are covered with cohesionless soil. Utilization of locally available soil for the construction of the subbase of these roads will optimize the cost and reduce the environmental impact. Recently cracks, settlement and outward movement have been observed in the pavement constructed using the locally available sandy soil. It is suspected that the usage of locally available soil would have caused this failure. Objective of this study is to assess the quality of the cohesionless soil as a highway construction material. Further, the applicability and validity of the currently used specifications for use of cohesionless soil as a highway construction material are also evaluated. To accomplish the above tasks, the experience of the construction industry in this regard was gathered through site visits, case studies, interviews with relevant personals. Based on the collected information a comprehensive laboratory test program was formulated to investigate the interrelationships between the soil properties such as grading, maximum dry density, California Bearing Ratio(CBR) value, plasticity index(PI), and liquid limit by mixing different type of clays with pure coarse sand. Laboratory test results and field data collected from road construction projects were analyzed. Final results were reviewed by the senior consultants at Road Development Authority(RDA) and National Building and Research Organization(NBRO).
Status: Accepted for Oral Presentation
61
Effect of Relict joint in Rain Induced Slope Failures
Neethimappiriya Tharmalingam (University of Moratuwa) Hansaka Lakshmana (University of Moratuwa) Thisula Kumarasinghe (University of Moratuwa) S. A. S. Kulathilaka (University of Moratuwa)
Rain induced slope failures is a common geotechnical hazards in most parts of the world. Particularly in the tropical regions, which are covered with residual soil, the temporal frequency of rainfall induced slope failures is very high. These problems are encountered in the construction of highway with the very high cut slopes. So the special focus should consider in the highway construction. Residual soils are formed due to weathering of rocks. The residual soils are heterogeneous due to variable weathering of the jointed mass rock. Joints are formed due to decomposition of rock Due to the presence of relic joints, the behavior of the residual soil is quite complex. Generally the ground water table is low during the dry season and these soils are in an unsaturated state. The shear strength of a soil is enhanced by matric suction. As a result of infiltration of rain water, the matric suction will be destroyed and ground water table rise. Due to the loss of matric suction the slope failures can induce. This aspect is studied in this research with the infiltration model by using SEEPW, SLOPEW soft ware
Status: Accepted for Oral Presentation
95
Wi-Fi based Positioning System
Aruni Tillekeratne (University of Moratuwa) Ayodhya Liyanagedara (University of Moratuwa) Buddhi Madarasinghe (University of Moratuwa) Nishchitha Ubhayaratne (University of Moratuwa) Dileeka Dias (University of Moratuwa)
Real Time Location-estimation systems (RTLS) developed for outdoor environments have shown significant errors due to changes in atmospheric conditions, multipath propagation and inherent signal strength variations. In this paper, we present an improved Wi-Fi based RTLS solution for the outdoors that reduces the above impacts. In addition this paper presents the development of a portable device for implementing the above RTLS solution. The research makes use of Euclidean, standard deviation based and triangulation algorithms. Data smoothening is done to reduce the multipath propagation issues. The different algorithm combinations are compared via their error cumulative distribution functions.
Status: Accepted for Oral Presentation
6
Use of soda ash as a recycling agent to reduce Non-degradable PET Waste in Sri Lanka
Sudasinghage Udayakumara (University of Moratuwa)
The Aim of this research is to use soda ash (Commercial grade of sodium carbonate) as a recycling agent to de-polymerize waste poly (ethyleneterephthalate) (PET) bottles into its initial monomers (i.e. terephthalic acid and ethylene glycol). The reaction between soda ash and crushed PET bottles was carried out under different reaction temperatures and times in an atmospheric pressure. Mono-ethylene glycol (EG) is used as a solvent or the reaction media for this reaction. The effect of EG: PET ratio on the yield also studied. Fourier Transform Infrared Spectroscopy (FTIR) technique was used to analyze the reaction products. In laboratory scale , 4/1 EG/PET weight ratio, 170oC operating temperature and 35 minutes reaction time were identified as the optimum conditions .The percentage of PET decomposition and yield of terephthalic acid was 78.89% and 77.95% respectively under above conditions
Status: Accepted for Oral Presentation
92
Application of Near Field Communication: Lounge Access in Air Travel
Dilu Weeraddana (Sit) navini Dantanarayana (University of Moratuwa) Sinthuja Rajendran (University of Moratuwa) wasana Jayasinghe (University of Moratuwa) Dileeka Dias (University of Moratuwa)
Application of Near Field Communication: Lounge Access in Air Travel N V Dantanarayana, W G R Jayasinghe, R Sinthuja, D M Weeraddana, S A D Dias Abstract Near Field Communication (NFC) is an emerging technology for short range wireless communication. Based on Radio Frequency Identification (RFID) technology, NFC provides a medium for the identification protocols that validate secure data transfer. It is designed to enable the exchange of various types of information between two NFC enabled devices in close proximity. NFC is considered to be useful in many areas namely payment, peer-to-peer communication, service initiation etc. In this paper we discuss how NFC is applied for access control. Since NFC is expected to be widely used in air travel in the near future, we focus our scope on using NFC for controlling access in a business class lounge at an airport. The design and implementation of different aspects have been carried out to maintain the effectiveness of access control and reduced cost. Features of the system ensure a unique personalized experience for the users.
Status: Accepted for Oral Presentation
20
Developing a Mobile Robot Simulator Platform to Test Control Applications
Charika Weerasiriwardhane (University of Moratuwa)
Most people are interested in building robots yet few try to simulate them in a computer to test and analyse the behaviours of robots prior to actually testing them physically. Our objective is to promote robot simulation and produce a tool that can aid in testing the robot control algorithms easier than testing on real robots, and record behavioural data of the robot more comprehensively. More emphasis is given to reducing variants caused by slip and friction to obtain more realistic results.
Status: Accepted for Oral Presentation
55
AxiCo2: Concurrency Coordination Runtime on top of Apache Axis2
Chamila Weerasooriya (CSE) Sasi Mudannayaka (CSE) Vindya Gunawardena (CSE) Lasantha Dinesh (CSE) Perera Srinath (WSO2)
AxiCo2 is an Application Programming Interface designed to simplify the implementation of concurrency in local environment as well as in the invocation of web services. AxiCo2 thereby reduces many inherent difficulties undergone by developers in programming multi-threaded applications. The higher level Application Programming Interface provided by AxiCo2 hides complexities associated with concurrency constructs and web service invocations. As a framework for concurrency and coordination among threads, AxiCo2 provides a means of asynchronous communication among threads using “Ports”. AxiCo2 has a thread pool within itself eliminating inherent overheads of thread per task approach. Apart from being a high level Application Programming Interface to hide complexities of concurrency, AxiCo2 provides means to the developer to configure applications to respond to partial success through the variety of Receivers provided. Our main focus in this paper is to present the underlying concepts of AxiCo2.
Status: Accepted for Oral Presentation
66
Demand Side Management for Micro Grids through Smart Meters
Saranga Wettasinghe (Department of Electrical Engineering,University of Moratuwa) KTMU Hemapala (University of Moratuwa) Hansa Widisinghe (Department of Electrical Engineering,University of Moratuwa) Dinesh Wijayasekara (Department of Electrical Engineering,University of Moratuwa) Tiran Wijesekara (Department of Electrical Engineering,University of Moratuwa)
A microgrid is a small scale power system consisting of distributed small power facilities such as solar power, wind power and micro-turbines. Because of some merits such as an eco-friendly system, good quality power supply and energy security, the microgrid has been researched and encouraged actively in many countries. For commercialization, the effective operation for the microgrid is very important. Micro grid power generation satisfies the power requirement of considerable number of off-grid consumers. Therefore consumers are limited to a low power usage. A Demand Side Management (DSM) system can be used for better power distribution among the consumers which is not in use nowadays. In this project the authors have made a network among consumers through Smart meters which are providing the ability to measure the real time power consumption and send those usage stats to the central server.
Status: Accepted for Oral Presentation
77
Enhancing the Effectiveness and Efficiency of Warehouse Operations in FMCG Sector in Sri Lanka
Deepthi Wickramarachchi (University of Moratuwa) Prabath Lakmal (Logiwiz Limited, Sri Lanka)
Central bank report (2009) emphasis that the cost of logistics is 23% of Sri Lanka's Gross Domestic Product (GDP) as against 10 % which is the global benchmark. Hence, Sri Lanka has failed to utilize 13% of the GDP due to inefficiencies and ineffective logistics practices. Considering logistics, warehousing is one component which can add significant cost to the supply chain .This paper is an attempt to document empirically the relation between factors affecting warehouse efficiency/effectiveness and the overall performance of the warehouse operation. It has studied three factors which affect efficiency and effectiveness of the warehouse operations in Sri Lanka with respect to Fast Moving Consumer Goods ( FMCG) industry. Such as, simplicity/complexity of the Warehouse Management Systems (WMS ), Product slotting techniques and layout planning of the warehouse. Findings indicate the expected significant correlation between factors affecting warehouse efficiency/effectiveness and the overall performance of the warehouse operation. The results of the research revealed that three factors which have studied, has positive impact to the performance of each warehouse operations. Research findings further revealed other related issues which has been affecting to the effectiveness of the operation. Most of the warehouses do not understand the importance of adopting best practices or may not be successfully implemented in order to increase the level of productivity. So that, this research has provided some recommended practices to the local warehousing sector as well. Keywords: Warehouse Management Systems, Layout Planning, Product Slotting Techniques, Fast Moving Consumer Goods, Efficiency and Effectiveness, Productivity,
Status: Accepted for Oral Presentation
56
GViz: An Enabling Framework for a Geo Data Visualization Dashboard
Wasantha Wickramasinghe (University of Moratuwa) Maninda Edirisooriya (University of Moratuwa) Ashan Fernando (University of Moratuwa) Prasad Fernando (University of Moratuwa) Shahani Weerawarana (University of Moratuwa)
This paper discusses the details of a research to design and implement a web-based geo-data visualization framework. This framework enables building dashboards with multiple visualization components. It provides extensibility, reuse of existing visualization components and use of multiple data sources. The framework also provides various extension points with the support of an event driven architecture for developers to extend its functionality thereby enabling of usage in a wide range of applications in the area of data visualization.
Status: Accepted for Oral Presentation
82
Analysis of Strategic Factors for the Sri Lankan Textile and Apparel Industry
Dharmasri Wickramasinghe (University of Moratuwa)
The present study explores the perception of managers on Strength, Weaknesses, Opportunities and Threats (SWOT) of the Sri Lankan Textile and apparel Industry. It is believed that the success or failure of the strategic decisions mainly depend on the accurate analysis of strategic factors. The objective of the study was to investigate the perception of mangers on strategic factors of the apparel firms which affect their short term, medium term as well as long term businesses decisions and their day to day decision making processes. The population of the study consisted of textile and apparel firms operating in Sri Lanka. The twenty seven questions comprised all 4 categories of the SWOT were used for the questionnaire. Respondents were asked whether they agreed, disagreed or neutral to the statements developed based on SWOT. The questionnaire was sent to 100 textile and apparel firms. A random sample of 82 top level managers who were involved in decision making process of the above mentioned firms responded to the survey questionnaire. Statistical analysis was conducted to analyze the data. A series of interviews were also conducted across business entrepreneurs, top managers and executives in the industry. Results showed that the SWOT factors and their rankings vary with the time and the factors that were considered few years back as strength has now been converted to weaknesses and some or the opportunities the industry enjoyed such as GSP+ has no longer an opportunity, but considered as a threat by some of the respondents.
Status: Accepted for Oral Presentation
58
Introducing process orientation to the Sri Lankan Apparel Industry
Tolusha Dahanayake Yapa (University of Moratuwa) Gamini Lanarolle (University of Moratuwa) Terrence Perera (Sheffield Hallam University)
As a key contributor to the country’s economy, the Sri Lankan Apparel Industry plays a major role in apparel business world. The intense competition from regional players is the main challenge that industry faces at present. As a result, many apparel manufacturers focus on continuously improving their business performance. Though they are targeting on improving the business process, still the understanding on the concept of process among majority of them is low. This factor is proved by a survey conducted prior to this study, to identify the level of understanding and application of processes among Sri Lankan apparel industry. Further, many industry experts agree that industry still operate as functional units, but not as processes [2]. Thus, many of their improvement initiatives are focused on optimizing the functional units leading to local optimizations, rather being globalized. Being process focused creates the ‘process culture’ among organizations by penetrating process thinking in all aspects. Further, being process oriented is a way to reduce cost, to increase quality level of the output, to improve overall performance of the business and to improve both customer and employee satisfaction. The key aim of this study is to introduce the concepts of process and process orientation to the Sri Lankan Apparel Industry (SLAI), thereby enabling to make improvement initiatives more effective. The business process was initially studied function-wise and then grouped into 6 key sub-processes and their validity was proved by comprehensive questionnaire surveys conducted among Sri Lankan apparel manufacturers.
Status: Accepted for Oral Presentation

On behalf of the Engineering Research Unit-Symposium 2011's Editorial Board, we Congratulate the authors. We thank all the authors who submitted papers, and invite them to consider submitting their work for upcoming symposia as well.

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ERU Reserach Symposium 2011, the official research symposium of the Faculty of Engineering, will be held on December 22, 2011.

List of paper accepted for oral presentation at the ERU Reserach Symposium 2011.

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