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RepoZip: A technique for lossless compression of document collections RepoZip:一种无损压缩文档集合的技术
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112368
D. Sumanaweera, F. F. Doole, D. Pathiraja, G. Deshapriya, G. Dias
{"title":"RepoZip: A technique for lossless compression of document collections","authors":"D. Sumanaweera, F. F. Doole, D. Pathiraja, G. Deshapriya, G. Dias","doi":"10.1109/MERCON.2015.7112368","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112368","url":null,"abstract":"Many computer systems; especially in corporations, contain large amount of documents such as letters, reports and presentations. Many such documents are present in several versions. Such data needs to be synchronized with branch offices and mobile devices, often over slow and expensive connections. However, as many documents are stored in an already compressed format, it is difficult to compress them further by exploiting the hidden redundancies. We present a novel approach named RepoZip which improves the compression of an existing compression algorithm over a document collection, by exploiting the inter-document meta-data and content-level redundancies. It concentrates on compressing OOXML documents that have been constructed through the archival of a hierarchy of meta-data files and PDF documents which include deflated content streams. Therefore, the RepoZip approach achieves larger compression gains over OOXML document collections or PDF document collections by exploiting usually undetected meta-data level similarities.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"8 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116673907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Establishing object correspondence across non-overlapping calibrated cameras 在非重叠校准相机之间建立目标对应关系
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112337
Dileepa Joseph Jayamanne, R. Rodrigo
{"title":"Establishing object correspondence across non-overlapping calibrated cameras","authors":"Dileepa Joseph Jayamanne, R. Rodrigo","doi":"10.1109/MERCON.2015.7112337","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112337","url":null,"abstract":"When establishing object correspondence across non-overlapping cameras, the existing methods combine separate likelihoods of appearance and kinematic features in a Bayesian framework, constructing a joint likelihood to compute the probability of re-detection. A drawback of these methods is not having a proper approach to reduce the search space when localizing an object in a subsequent camera once the kinematic and appearance features are extracted in the current camera. In this work we introduce a novel methodology to condition the location of an object on its appearance and time, without assuming independence between appearance and kinematic features, in contrast to existing work. We characterize the linear movement of objects in the unobserved region with an additive Gaussian noise model. Assuming that the cameras are affine, we transform the noise model onto the image plane of subsequent cameras. We have tested our method with toy car experiments and real-world camera setups and found that the proposed noise model acts as a prior to improving re-detection. It constrains the search space in a subsequent camera, greatly improving the computational efficiency. Our method also has the potential to distinguish between objects similar in appearance, and recover correct labels when they move across cameras.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133183536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of starch particle size reduction on the performance of sized warp yarns 淀粉降粒对浆纱性能的影响
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112321
S. Fernando, T. Paranavithana, U. Dissanayaka, W.G.L.U. Premarathna, Anees Atambawa, Nalin de Silva, Nadeeka P. Tissera
{"title":"Effect of starch particle size reduction on the performance of sized warp yarns","authors":"S. Fernando, T. Paranavithana, U. Dissanayaka, W.G.L.U. Premarathna, Anees Atambawa, Nalin de Silva, Nadeeka P. Tissera","doi":"10.1109/MERCON.2015.7112321","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112321","url":null,"abstract":"The mechanical and physical properties of tapioca based starch are known to vary in relation to physical parameters including the particle size of the starch granules. In this study, ultra sonication was used to reduce the particle size of starch solution from 100μm to 8μm and the modified starch was applied on poly cotton warp yarns. The strength, extension, moisture regain and size add-on % was tested and compared with the properties of conventionally sized yarns. The results showed that better strength and extension properties can be obtained by the application of ultra sonicated size solution at lower drying temperatures and lower squeeze roller pressures with minimum size add-on %.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"51 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134537828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Use of software metrics in agile software development process 在敏捷软件开发过程中使用软件度量
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112365
K. Padmini, H. D. Dilum Bandara, I. Perera
{"title":"Use of software metrics in agile software development process","authors":"K. Padmini, H. D. Dilum Bandara, I. Perera","doi":"10.1109/MERCON.2015.7112365","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112365","url":null,"abstract":"While software metrics typically help to assess the status of a project, process, product, and resource use, the suitability of metrics in Agile Software Development (ASD) process is frequently questioned due to the overheads involved. Moreover, many established metrics used in the Traditional Software Development (TSD) process, cannot be directly applied to ASD due to its iterative and incremental development process that is willing to incorporate changes throughout. Nevertheless, very little is explored about the use and suitability of metrics in the context of ASD. We fill this gap by exploring metrics suitable for the ASD process, use of those metrics in practice, perceived benefits, and related tools. Our survey and interview based analysis of 24 development companies identified 10 metrics that can be beneficial to the ASD process, where their benefits outweigh the overheads involved.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133830241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 31
Computing requirements of Sri Lankan scientific community 斯里兰卡科学界的计算需求
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112360
Asanka Dias, H. M. N. Dilum Bandara
{"title":"Computing requirements of Sri Lankan scientific community","authors":"Asanka Dias, H. M. N. Dilum Bandara","doi":"10.1109/MERCON.2015.7112360","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112360","url":null,"abstract":"Significant improvements in Information and Communication (ICT) infrastructure over the last decade put Sri Lanka among the top developing nations for ICT-led economic and social growth. While ICT has also contributed to increased research outcomes through better access to world-class knowledge, research resources, and other researchers, overall growth and significance of research findings are not in par with most of the top developing nations. In this research, through surveys and interviews, we explore the current state of computing resources available for research, as well as the needs and challenges faced by researchers. We identified a number of challenges, including shortage of computational and storage resources, cost of software licenses, limited awareness of alternative tools, inadequate programing skills among graduate students, unavailability of research computing support staff, unreliable infrastructure, and organizational constraints. We further discuss potential solutions to address some of these technical and nontechnical challenges.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123657541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Automatic governor for tie-line control: A teaching tool 自动调速器系线控制:教学工具
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112325
L. D. De Silva, D. D. M. I. Deegala, I. Karunathilake, P. Kumari, J. R. Lucas, P. D. de Silva
{"title":"Automatic governor for tie-line control: A teaching tool","authors":"L. D. De Silva, D. D. M. I. Deegala, I. Karunathilake, P. Kumari, J. R. Lucas, P. D. de Silva","doi":"10.1109/MERCON.2015.7112325","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112325","url":null,"abstract":"Power transmission between interconnected systems is a major concern in the present electrical engineering context and is of utmost importance to Electrical Engineering undergraduates. A voltage scaled power system simulator with two interconnected areas has been designed, for educational purposes, using vacuum circuit breakers, a diesel generator, a motor-generator set, transmission lines, bus bars, loads etc. Synchronization of two areas and a power controller of the tie line between the two areas have been implemented. In addition, students can learn about different interactions, such as synchronous and isochronous operation of generators with large systems. This paper finally discusses the possible experiences of interconnected power systems that undergraduate students could be exposed to.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125135625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Estimation of demand for bus rapid transit: Case study for Galle Road from Moratuwa to Pettah 快速公交需求的估计:以莫拉图瓦至卑打加勒路为例
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112346
A. Kumarage, W. Weerawardana
{"title":"Estimation of demand for bus rapid transit: Case study for Galle Road from Moratuwa to Pettah","authors":"A. Kumarage, W. Weerawardana","doi":"10.1109/MERCON.2015.7112346","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112346","url":null,"abstract":"Bus Rapid Transit (BRT) is a high quality bus based transit system which has been identified by the Ministry of Transport, Sri Lanka as an effective transport solution for urbanized areas. Demand estimation for the BRT is a key element in operational planning as it becomes a primary criterion for selection of vehicles, scheduling of services, determination of fleet size and the design stations etc. This paper illustrates a methodology derived from traffic survey data for the estimation of demand for the proposed BRT corridor from Moratuwa to Pettah on Galle Road.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125160907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adsorption of cadmium and lead heavy metals by chitosan biopolymer: A study on equilibrium isotherms and kinetics 壳聚糖生物聚合物吸附镉、铅重金属的平衡等温线及动力学研究
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112351
J. Unagolla, S. Adikary
{"title":"Adsorption of cadmium and lead heavy metals by chitosan biopolymer: A study on equilibrium isotherms and kinetics","authors":"J. Unagolla, S. Adikary","doi":"10.1109/MERCON.2015.7112351","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112351","url":null,"abstract":"Since heavy metal pollution is a significant aspect to aquatic ecosystems, the objective of this research work was to investigate adsorption characteristics of chitosan as an alternative adsorbent material. In this study, chitosan, synthesized from locally available shrimp type “penaeus monodon” was used to observe adsorption characteristics of cadmium (Cd) and lead (Pb) heavy metals from aqueous solution. Batch kinetic experiment studies were conducted for changing initial pH, initial concentration of metal ions, particle size and degree of deacetylation (DD) of chitosan. Simplified models such as, pseudo first order, pseudo second order and intra-particle diffusion models were used to analyze the experimental data. The result showed that the adsorption capacity strongly depends on pH and DD. It was clearly seen that higher adsorption of heavy metals occur at comparatively high pH and high DD. Equilibrium experimental data were analyzed by using two different isotherm models namely, Langmuir and Freundlich. The characteristic parameters for each isotherm and related correlation coefficients were determined by using mathematical modeling software. Isotherms show that adsorption process of Cd and Pb is a heterogeneous process.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124506025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Improvement of physico-mechanical properties of calcium carbonate filled natural nubber and low density polyethylene blends with titanate coupling agent 钛酸盐偶联剂对碳酸钙填充天然纤维和低密度聚乙烯共混物物理力学性能的改善
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112350
W. Sampath, D. Edirisinghe, S. Egodage
{"title":"Improvement of physico-mechanical properties of calcium carbonate filled natural nubber and low density polyethylene blends with titanate coupling agent","authors":"W. Sampath, D. Edirisinghe, S. Egodage","doi":"10.1109/MERCON.2015.7112350","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112350","url":null,"abstract":"Nonblack particulate fillers most used with thermoplastic and rubber are calcium carbonate, silica, talc and alumina hydrates. The main characteristics, which control the effectiveness and the dispersion of filler in the polymer, are structure, surface area and chemical activity of filler. The mechanical behavior of rubber-thermoplastic blends depends greatly on interactions and compatibility that develop between the two polymers and the filler. The main objective of this study is to improve physico-mechanical properties of calcium carbonate (CaCO3) filled natural rubber (NR) and low density polyethylene (LDPE) blends using a titanate coupling agent. Two series of NR/LDPE blends, with and without titanate coupling agent, were prepared by varying LDPE loading from 10% to 90% at 10% intervals. 20 parts by weight of CaCO3 per 100 parts of combined polymer was incorporated into every blend composition. The blends were prepared using a Brabender plasticorder by melt mixing at a temperature of 130 °C, and at a rotor speed of 60 rpm. Physico-mechanical properties such as tensile properties, hardness, tear strength and morphology of the blends were studied. These properties were determined according to ISO standards. Morphology of the tensile fracture surface of blends was observed using a transmitted light microscopy. Tensile strength, tear strength and hardness of NR/LDPE blends increase with increase in LDPE loading while elongation at break decreases. NR/LDPE blends with titanate coupling agent exhibited enhanced properties at every LDPE loading. NR/LDPE blends having 30% of LDPE loading showed highest tensile strength. In this blend, NR was dispersed in LDPE matrix with good adhesion between NR and LDPE.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Identifying the cruising dynamics of a medium scale UAV I: Longitudinal dynamics 中等规模无人机的巡航动力学辨识I:纵向动力学
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112331
C. I. Gamage, S. Samarasekera, A. Tennakoon, R. Lalantha, R. Munasinghe
{"title":"Identifying the cruising dynamics of a medium scale UAV I: Longitudinal dynamics","authors":"C. I. Gamage, S. Samarasekera, A. Tennakoon, R. Lalantha, R. Munasinghe","doi":"10.1109/MERCON.2015.7112331","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112331","url":null,"abstract":"Pitch and airspeed responses of a medium scale UAV were identified using the prediction error method. Data collection was conducted with an active closed loop autopilot control system. A naive SISO open loop transfer function was estimated using the parametric direct approach. Since its predictability was not significant, better estimators were developed using MISO parametric direct, and SISO parametric indirect method. The model validations were done to quantify their predictability.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122315004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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