ERU - 2013

Permanent URI for this collectionhttp://192.248.9.226/handle/123/14694

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item: Conference-Full-text
Beyond the traditional telecom promotions, with the escalating customer base
(2013) Jayawardhana, MKPR; Kumara, PKAM; Paranawithana, WDAI; Anjitha, T; Weerawarana, SM
Through the past years, traditional telecom customer base has escalated with wide usage of mobiles. But the services and promotions offered by the service providers has been limited to a specific frame, without extracting useful information from the data they gather with each call. Specifically in mobile user segment, there is lot of data available for the service provider other than the credit balance to consider in giving away service and promotions. Among many reasons, a barrier for this is the technical feasibility. With the growing customer base and elastic behavior of network usage with the time and seasons, proposing an effective way of available data analyzing is challenging. It becomes more challenging when the results are required in near real time for the promotion to be of use. With this research study we discuss and compare the available technologies to be used, propose a system with the most appropriate technologies and express the results gained with an implemented prototype 'Kanthaka '.
item: Conference-Full-text
Characterization of clay deposits in Nachchaduwa area for ceramic fabrication
(2013) Wanasinghe, DD; Adikary, SU
In this research clay deposits located in the Nachchaduwa area were investigated to identify suitable ceramic fabrication techniques and products. Deposits located in this area are known to be rich in Kaolinite and Montmorillonite (MMT) and other type of phyrophyllite clays. These are known as "Red Clav" and mined to fabricate traditional ceramic ware by traditional techniques. The specimens were collected fr~m tanks located in this area and subjected to Fourier Transform Infrared Spectroscopy (FTlR). X-ray Diffraction (XRD). Differential Thermal Analysis (DTA) and Thermo Gravimetric Analysis (TGA). after purifying them and removing organic compounds. Combination of these techniques with the chemical analysis on selected specimens was employed to accurate identification of the clay specimens. The results were then compared with each other and published literature for the identification. Results showed the presence of MMT, kaolinite. quartz and other type of clay minerals in small quantities; furthermore specimens subjected to chemical analysis revealed that they contain more than 50% quartz by weight. The purified clay specimens were subjected to a Deflocculant Demand Test. which determines the optimum amount of deflocculant needed to prepare a casting slip. but the test showed that these claysare not suitable to prepare a casting slip in fabricating ceramic ware.
item: Conference-Full-text
Control system for quad rotor UAV
(2013) Sampath, BG; Wijesiri, NRAAR; Pitahawatte, JMLMGB; Dassanayake, VPC
This paper presents the design, analysis and testing oj a control system Jor a quadrotor. The research is focused on the maneuverability oj the quadrotor hence the mechanical design was done together with the design of the controlling algorithm. Constraints which occur due to using pre-built quadrotors, were eliminated by using this methodology. This enables more aggressive and aerobatic flying compared to other systems designed with off-the-shelf quadrotors.
item: Conference-Full-text
Corrosion behavior of steel in different atmospheric conditions
(2013) Adikari, AAMT; Munasinghe, RGNDS; Jayatileke, S
Corrosion of metals makes a large impact on the economy of a ountry. Therefore, it is important to take remedial actions to prevent structures, machinery and vehicles from corrosion. Among the various types of corrosion the corrosion that occurs in the atmosphere is known as atmospheric corrosion and it accounts for more failures than other types of corrosion. To take preventive actions against atmospheric corrosion of metals, it is essential to study the corrosivity of the atmosphere by analyzing factors that influence it. The corrosivity of the atmosphere mostly depends on several atmospheric variables, such as relative humidity, temperature, rainfall, chloride deposition rate, pollutant gases like nitrogen and sulfur oxides. In order to study the severity of the atmosphere which promotes the metal corrosion three types of commonly used structural materials mild steel, stainless steel 304 and 316 were exposed in two different atmospheric conditions. Two corrosion test panels were placed in two geographical locations and loss of weight due to corrosion was continuously measured in all three types of metals. The atmospheric variables in the two locations were also continuously recorded. Finally, these data were fitted with the power model in order to predict the rate of corrosion under particular atmospheric conditions. With the predicted corrosion rate under a particular atmospheric condition it is possible to take ecessary preventive measures during the design or in the service of metallic structures, machinery and vehicles etc. The broad aim of this research work is to collect adequate data to develop a corrosion model to redict the corrosion rate in any atmospheric environment in Sri Lanka using measured atmospheric variables and thereby establish a 'corrosion map 'for Sri Lanka.
item: Conference-Abstract
Design and Implementation of a Laboratory-scale Microgrid
(2013) Muthugala, VV; Pathirana, NPDS; Nanayakkara, WHKP; Nanayakkara, NPDCD; Hemapala, KTMU
This paper deals with the implementation of a single phase laboratory scale micro grid (MG) including a control system based on emulated energy resources and loads which permits the experimentation of various scenarios. The proposed MG is comprised of a wind turbine simulator, a solar photovoltaic (PV) and a battery bank which are connected to the MG via flexible Voltage Source Inverters respectively. Although a MG can operate either in grid connected mode or islanded mode, in our research we have mainly focused on islanded operation only. In that mode, bidirectional inverter performs a major role in maintaining the voltage and frequency at an acceptable level for safe collaborative operation. The results of these studies show the capability of developing a reliable control mechanism for islanding operation of micro grids based on the proposed concept.
item: Conference-Full-text
Design and optimization of a mems based piezoresistive pressure sensor for flash flood level measurement
(2013) Priyadarshana, TGP; Wijethunge, HMDP; Jayasekara, BCCP; Amarasinghe, YWR
This paper is focused on designing and optimization of a Micro Electro Mechanical System (MEMS) based piezoresistive type pressure sensor to enhance the sensitivity by optimally utilizing the maximum available Silicon wafer cell volume of 3mmX3mmX400pm and a fixed thickness of IOpm due to fabrication constrains. Here an analysis is carried out by varying the dimensions of two different diaphragm geometries, namely conventional square type diaphragm and cross-sectional beam type diaphragm. The analysis is done using finite element method (FEM) technique in ANSYS software and by comparing the results, the better diaphragm type is chosen for the required pressure range of the application for flash flood level measurement. The results show that for some pressure ranges the cross-sectional beam type diaphragm delivers a much better sensitivity than the conventional square type diaphragm.
item: Conference-Full-text
Design and testing a portable negative pressure wound therapy (NPWT) device
(2013) Welgama, WPD; Gray, HA; Amarasinghe, YWR; Wijeyaratne, SM; Sugathapala, AGT
The purpose of this research was to develop a clinically validated portable NPWT device with low power consumption features. A new NPWT device having dimension of 30 cm x20 em
item: Conference-Full-text
Developing a system to calculate cutting process time of garments
(2013) Upendra, RAS; Kaluarrachchi, P; Weerasekara, KMRD; Ratnayake, VS
The paper includes a methodology to calculate the fabric laying and cutting times for a cutting department of an apparel manufacturing company. The methodology was developed based on the data collected for woven trouser patterns. A data base of basic times was developed for fabric laying and cutting operations. By analyzing the variations in time values in relation to the parameters that effect the process relationships were developed which were used to calculate the standard minute values for the process. The methodology can be used to calculate the SMV for a lay and it can be further used to develop incentive schemes for the cutting department.
item: Conference-Full-text
Development of a comprehensive fabric quality grading system for selected end uses
(2013) Balasooriya, MC; Athukorala, DMA; Sanjaya, MGC; Mayura, S; Niles, SN; Abeysooriya, RP
This study focuses on the development of a comprehensive fabric quality grading system for selected end uses. This system goes beyond currently existing methods by reflecting the suitability of a candidate fabric for a specific end use, by evaluating its key properties and grading the fabric with respect to its overall quality level and has been developed by studying the retailer fabric specification standards. A set of fabric parameters was selected for each of four retailer customers who were identified by an industrial survey. The selected fabric parameters were transformed into a sub-index value calculated by an equation for each parameter using test values obtained from the considered fabric. Weights were assigned to the parameters considering the level of importance identified by the survey for each fabric parameter. A weighted arithmetic mean function was used as the aggregation function in which the aggregate of the products of sub index value and the weighting for each arameter were taken as the overall fabric quality value on a scale of zero to hundred. This system is designed to assist decision makers in selecting a suitable fabric material for a specific end use by comparing the overall quality of several fabrics. A computer application was developed as the user interface to evaluate fabrics using the developed system. The results obtained from this system compared favourably with those obtained through manual evaluation of the fabric
item: Conference-Full-text
Development of a new scouring methodology for the textile industry
(2013) Wijayapala, UGS; Dharmasena, DKAS; Bandara, DMN; Chathuranga, MAI; Rajapakshe, KS
Scouring is one of the most important processes in fabric formation in the textile industry. The main function of scouring is the removal of hydrophobic impurities in fabrics made out of natural fibers. Normally scouring is done after the sizes are removed in the desizing process. Three main scouring methods can be identified in the current textile industry. Alkaline scouring, Bio scouring, Solvent scouring are those three main methods with the alkaline scouring being the traditional and widely used method. In this research the drawbacks of the existing scouring methods have been discussed under three main aspects which are efficiency, economy and environmental friendliness. Neither of the above three scouring methods satisfy all these three aspects, at least up to a reasonable level. In order to achieve all these three objectives concurrently, development of a new process by combining existing methods was focused on in this research. This approach has not been followed in the past. Under this project, combining of Alkaline scouring with Bio scouring and Solvent scouring were separately considered as the approach of the research. Widely used Alkaline (NaOH) scouring method has been chosen as the reference method and aspects of this method were compared with experimental results. Recipes were developed according to general requirements of combining agents and tested with 100% cotton twill fabric and results were analyzed. Within all tested recipes the most suitable combination was finalized with necessary conditions in order to achieve better results in terms of efficiency, economic and environment friendliness compared to the reference methodology.
item: Conference-Full-text
Distributed intelligence as an information retrieval system
(2013) Jayathilake, DSP; Herath, HMST; Wimalasooriya, RDDP; Karunarathne, SDJ; Weerawardhane, S
The traditional knowledge based approach is not a feasible choice to be utilized in information retrieval in domains such as Geographic Information Systems (GIS), because accurate information of geographic data is spatially distributed and vast in volume. The challenge is to improve the process of information retrieval, which can be applied to varying contexts such as GIS, going beyond the limits imposed by the knowledge base centric approaches. Social networks possess a vast amount of unstructured knowledge in its user base, which can be used in drawing interesting patterns, if analyzed in a systematic approach. 1n this paper, we emphasize on an approach for information search and retrieval, by combining the social network of human intelligence and knowledge bases of information. Users of the system can present natural language queries, and questions can be directed to relevant experts within the social network. Distributed information retrieval and information fusion is applied to optimize the process of single answer generation. The feasibility of our proposed architecture is investigated by implementing a QA(Question Answering) system on a social network as a proof of concept. The Question Answering System is based on geographic queries which will be directed to relevant users within the network to gather answers. Varying methods of information fusion and Natural Language Processing have been researched and discussed to discover the suitable approaches for answer generation. With the wide acceptance of the social networking paradigm and sharing of information, this approach can - be extended to other domains as well.
item: Conference-Full-text
Document analysis based automatic concept map generation for enterprises
(2013) Herath, HMTC; Fernando, KNJ; Karannagoda, EL; Karunarathne, MWID; De Silva, NHN; Perera, AS
Ever growing knowledge bases of enterprises present the demanding challenge of proper organization of information that would enable fast retrieval of related and intended information. Document repositories of enterprises consist of large collections of documents of varying size, format and writing styles. This diversified and unstructured nature of documents restrict the possibilities of developing uniform techniques for extracting important concepts and relationships for summarization, structured representation and fast retrieval. The documented textual content is used as the input for the construction of this concept map. Here a rule based approach is used to extract concepts and relationships among them. Sentence level breakdown enables these rules to identify those concepts and relationships. These rules are based on elements in a phase structure tree of a sentence. For improving accuracy and the relevance of the extracted concepts and relationships, the special features such as titles, bold and upper case texts are used. This paper discusses how to overcome these challenges by utilizing high level natural language processing techniques, document preprocessing techniques and developing easily understandable and extractable compact representation of concept maps. Each document in the repository is converted to a concept map representation to capture concepts and relationships among concepts described in the said document. This organization would represent a summary of the document. These individual concept maps are utilized to generate concept maps that represent sections of the repository or the entire document repository. This paper discusses how the statistical techniques are used to calculate certain metrics which facilitate certain requirements of the solution. Principle component analysis is used in ranking the documents by importance. The concept map is visualized using force directed type graphs which represent concepts by nodes and relationships byedges.
item: Conference-Extended-Abstract
Dress and dressing an object of communication and activity of culture
(9/11/2015) Karunaratne, PVM
Dress is a non verbal communicative object and dressing is a part of cultural activity. One of the distinctive features of dress is that a group of people shares a particular patterns or styles of dress. The style of a dress is a consequence of the culture of a society and the traditions which people follow. The way people dress and decorate their body with a variety of jewelry and the methodology of arranging the dress to the body is a communicative activity. Individuals share ideas and beliefs according to their ideologies of culture. Besides, they participate in social agreements by which they live from generation to generation and from individual to individual. The objective of the paper is to investigate the material and non material culture during the period of the Kotte kingdom by focusing on the extended cultural practices amalgamated with dress and dressing. Further this article looks for changes in contextual boundaries of dress signs in order to understand the culture which predominates dress communication. The method adopted for the research was qualitative. Research findings show that dress fashions and dressing in Sri Lanka is made up of a rich set of possible combinations of cultural and communicative objects which entails authentic individuation of an outfit.
item: Conference-Full-text
Effect of cryogenic cooling on machining performance on hard to cut metals - a literature review
(2013) Senevirathne, SWMAI; Fernando, MARV
This paper presents a literature review done on Cryogenic cooling, Liquid Nitrogen Cooling(LNC), and 'Chilled Air and Minimum Quantity Lubrication' (CAMQL) cooling methods used in machining operations, targeting to recognise better cooling methods for the Sri Lankan die and mould making sector (SLDMMS). The state of the art in cryogenic machining was searched and reviewed first, and then its benefits, limitations, and applications were studied. Alternative cooling methods for conventional emulsion cooling were searched. The benefits from cryogenic cooling and other alternative methods were analysed and compared. LNC and CAMQL cooling were chosen as subjects for further comparative study. A substantial amount of literature was found on the effect of these cooling methods on hard-to-cut materials such as lnconel, Titanium alloys etc., but very few or no studies had been carried out on materials used in the Sri Lankan die and mould making sector. A survey on materials used in SLDMMS is recommended to identify the most commonly used material types. An economic feasibility study of cryogenic cooling and chilled air cooling is recommended.
item: Conference-Full-text
Feasibility study on contact dermatitis using textile finishes
(2013) Munasinghe, PD; Wanniarachchi, T
Contact Dermatitis (CD) is a skin disease which can make humans fearful of wearing certain fabrications. Formaldehyde and its compounds are the main causative agents and Nickel and Chromium also work as allergens for CD. Chemicals used in finishing processes are also identified as causative agents and Fiber types can have an effect on the disease. Symptoms of the disease were reviewed using books and previous researches in this study. Reddish blisters, itching and reddish skin are common symptoms of CD. As there is no evidence about CD in Ayurveda, Western medicine and Ayurweda were linked by matching symptoms to find the connectivity of the skin diseases. Ayurweda described about “Kshudra Kushta” which has similar symptoms to those of CD. Herbs such aswild snakegourd, white sandalwood, red sandal wood and Heart leaved Moonseed are used in Ayurveda to cure “Kshudra kushta”. Mixtures of herbs with fixing agents were applied to cotton and polyester fabrications through a natural dyeing method to find a fabric finishing method for CD. Two types of fixing agents; Copper Sulphate and Aluminum Sulphate were applied separately with different amounts to identify best recipe. The herbal mixture has a reddish colour. The mixture was tested with colour fastness to wash test ISO – 165-CO1:1987 and pH value of the olutions was also checked to study the feasibility. Cotton fabrications showed acceptable durability up to three (3) washes and polyester had poor durability. Wash durability is also dependent on the amount of fixing agents. There were slight colour changes after Copper sulphate treatment; Aluminum sulphate did not showed any colour change. It has neutral pH range. Fourteen (14) different garments which cause symptoms of CD were treated with the herbal mixture and wear trials were carried out. All garments showed positive results up to 3 domestic washes.
item: Conference-Full-text
Flight search optimization using in-memory data management
(2013) Dimithrie, PS; Dias, G
In current travel planning systems, even for a relatively straightforward round-trip query, it is not uncommon to spend more than 30 seconds. If the results can be produced as quickly as possible it will res u I t in a competitive advantage in the market since the delay is undesirable for the user of the system, as it reduces inter activity. Traditionally, data will be placed in storage then, when needed, will be accessed and acted upon in the computer's memory which results in a natural bottleneck that reduces speed. With the emergence of multi-core processors and availability of large amounts of main memory at low cost new breakthroughs in the software industry such as in-memory technology are being created In-memory and multicore technology have the potential to improve the performance. If all data can be stored in the main memory instead of on disk, the performance of operations on data, especially on mass data, is improved. In this paper it is intended to take the advantage of in memory technology, where all the data resides and has been processed in the main memory and develop a CPU based algorithm in order to optimize the flight and air fare search in air travel planning, basically using hashing technique. This algorithm also has the potential to take the advantage of multi core processors in the future since it used in-memory data management. With the use of Google hash maps the memory has been used effectively. With the selected sample data almost all the searches could be performed in milliseconds. Also with the increase of the maximum number of connecting airports, searching time is also increased.
item: Conference-Full-text
Forevidizer forensic video & image analyzing toolkit
(2013) Wijayasiri, A; Sampath, C; Rathnayaka, N; Jayaweera, R; De Silva, C
Digital videos and images have become a common thing in life. More and more sophisticated tools are becoming available for the general consumers. With the advancement of digital image processing and video processing technologies, various kinds of images and videos are produced from different perspectives. As a result videos can be used for various frauds and illegal activities. Legislative changes have been made to accept videos and images from digital cameras as witnesses for legal proceedings. Consequently there is a growing interest in forensic analysis of video content where the integrity of digital images and videos need to be checked. In this respect it has become essential to have a proper toolkit to analyze whether a particular video is a real one or one that has been tampered with. As video editing techniques are getting very sophisticated, tampered videos are hard to detect. However, when a video is tampered with, some of the basic properties of the video are changed. Then to detect those changes it is needed to use complex image processing and video processing techniques and algorithms. We present methods to analyze these properties of a given video, and produce statistical details for the video to ascertain whether it is tampered with or not, and if it is tampered with then what changes have been made. Video frame duplicate detection, video double MPEG compression detection, image double JPEG compression detection and duplicated regions within image detection are the basic methods offorgery detections.
item: Conference-Abstract
A Framework to analyze the effectiveness of collaborative e-Learning (CeL) in Sri Lankan University Education
(2013) Kanaganayagam, I; Fernando, MSD
E-learning introduced new ways of learning using computers and the Internet, and is rapidly evolving with the development of technology. Learners can actively participate and collaborate in a learning process using either synchronous or asynchronous e-learning. Collaborative e-Learning (CeL) is an effective pedagogy approach, which also improves the processing skills, communication skills, and cognitive skills of the students. In this research study, a framework was developed to analyze the effectiveness of CeL in Sri Lankan university education. The study was conducted among lecturers, assistant lecturers, undergraduate students and post-graduate students of 15 Sri Lankan National universities. Interviews were used as the research instrument through different media such as direct interview, telephone interview and Skype interview. Our research findings helped to identify the most effective tools to use in CeL, which improve lecturer-student and student-student interaction. Further, awareness about CeL, perception of the requirement of CeL, and the assessment criteria of the effectiveness of CeL were identified in the context of Sri Lankan university education. In addition, a framework was developed to analyze the effectiveness of CeL in a quantitative manner. Finally, this paper presents recommendations to improve the effectiveness of CeL in Sri Lankan universities and discusses possible areas for future research in this arena.
item: Conference-Abstract
Generalized extensions for botnet detection
(2013) Balasooriya, BCSSA; Fernando, MSD
Along with the improvement of computer technologies, there is a significant change in the threat landscape. Large scale attacks and digital criminal activities have exposed the Internet to serious security breaches, and alarmed the world regarding cyber-crime. The core of these problems are the so called botnets. Botnets have a dynamic and flexible nature. The Bot-masters, who are controlling the botnets, update the bots and change their codes day by day to avoid the traditional detection methods such as signature-based anti-viruses. Additionally, various techniques are employed by Bot-masters to make their botnets undetectable as long as possible. Recent botnets consist of millions of infected machines, making use of this attack vector inevitably harmful. A better understanding of botnets will help to coordinate and develop new technologies to counter this serious security threat. The effort of the research is to analyze the behavior, possible countermeasures and preventive procedures of botnets; and come up with Generalized Extensions for Botnet Detection to detect botnets on computer networks. The proposed Generalized Extensions for Botnet Detection provides a model to detect botnets.
item: Conference-Full-text
Generic log file data extraction
(2013) Bandara, TPSH; Chandrasekara, WKMSP; Chathunga, JAR; Chiranjeewa, KAL; Wimalasuriya, DC; Fernando, MBTL; Jayathilake, PWDC
Automated software log file analysis holds an important position in software maintenance. Currently available analysis tools are not generic. They tend to focus on specific software or servers and their flexibilities are minimal. Furthermore, costs of commercially available log analysis tools are not affordable for small and medium scale firms. This has left a void in the market for generic, customizable and open source log file analysis tools. The impediment to such a tool emerging is the unavailability of a generic log file data extraction mechanism. A generic log file format definition language and an underlying persistent data storage system is a solution to this problem. Log file structures could be defined by the aforementioned language and the data extracted would be stored in the persistent storage. This methodology enables generic log file analysis on top of the extracted data. Through the research and implementations carried out, it was identified that a modified version of simple declarative language is suitable for the log file format definition language. II would have the capability of handling and defining all patterns of text based log files. Additionally. the results revealed that the appropriate storage mechanism would be an Extensible Markup Language (XML) database mainly because of the similarities between the hierarchical nature of XML and common log file structures.

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