Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421907
K.E. Kishani, A. de Alwis, M.K.S. Dimithra, K. De Silva, H.Y. Ranjit Perera, W. Wijayapala
Hydropower is the oldest and the main renewable source of electricity generation in Sri Lanka. It has two main sources i.e. conventional and non-conventional. The available conventional hydro resource in Sri Lanka has already been harnessed to its maximum economic potential. The non-conventional hydropower generation i.e. mini-hydropower generation is predominantly run of river type. Yet, they are not dispatchable and operate when the flow of water is available. When analyzing the distribution of mini hydro projects, there are a number of locations having the capability of the addition of a storage capacity. It allows the plant to capture a certain amount of water to operate when it is required. This paper presents a comprehensive feasibility analysis of introducing dispatchable mini hydro plants to Sri Lankan power sector through low cost high efficient and environmentally friendly energy solutions. In this research, a technical, economic and environmental feasibility of introducing storage capacity is evaluated for Bulathwatta Mini Hydro Plant (MHP) and Batathota Mini Hydro Plant (MHP). The potential increment of mini-hydropower generation is evaluated with coal and fossil fuel displacement.
{"title":"Technical, Environmental and Economic Feasibility of Introducing Added Storage to Run of River Mini Hydro Plants to Improve Dispatchability","authors":"K.E. Kishani, A. de Alwis, M.K.S. Dimithra, K. De Silva, H.Y. Ranjit Perera, W. Wijayapala","doi":"10.1109/MERCON.2018.8421907","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421907","url":null,"abstract":"Hydropower is the oldest and the main renewable source of electricity generation in Sri Lanka. It has two main sources i.e. conventional and non-conventional. The available conventional hydro resource in Sri Lanka has already been harnessed to its maximum economic potential. The non-conventional hydropower generation i.e. mini-hydropower generation is predominantly run of river type. Yet, they are not dispatchable and operate when the flow of water is available. When analyzing the distribution of mini hydro projects, there are a number of locations having the capability of the addition of a storage capacity. It allows the plant to capture a certain amount of water to operate when it is required. This paper presents a comprehensive feasibility analysis of introducing dispatchable mini hydro plants to Sri Lankan power sector through low cost high efficient and environmentally friendly energy solutions. In this research, a technical, economic and environmental feasibility of introducing storage capacity is evaluated for Bulathwatta Mini Hydro Plant (MHP) and Batathota Mini Hydro Plant (MHP). The potential increment of mini-hydropower generation is evaluated with coal and fossil fuel displacement.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"19 1","pages":"488-493"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89066111","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421890
P. Nanayakkara, Surangika Ranathunga
News aggregators help readers to handle large numbers of news items in a convenient manner by collecting them into a single place with meaningful groupings. Such news aggregators/clusters are available for English and some other popular languages. However, no such tools are available for Sinhala language. To address this void, this paper presents a system to collect news articles published across the web and group related articles using corpus-based similarity measures. Despite the simplicity of the technique and morphological richness of Sinhala, we achieved very promising results that prove the viability of the presented technique.
{"title":"Clustering Sinhala News Articles Using Corpus-Based Similarity Measures","authors":"P. Nanayakkara, Surangika Ranathunga","doi":"10.1109/MERCON.2018.8421890","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421890","url":null,"abstract":"News aggregators help readers to handle large numbers of news items in a convenient manner by collecting them into a single place with meaningful groupings. Such news aggregators/clusters are available for English and some other popular languages. However, no such tools are available for Sinhala language. To address this void, this paper presents a system to collect news articles published across the web and group related articles using corpus-based similarity measures. Despite the simplicity of the technique and morphological richness of Sinhala, we achieved very promising results that prove the viability of the presented technique.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"437-442"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88568355","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421952
Kc Ratnayake, S. Nanayakkara
The design of water retaining structures is mainly based on the serviceability limit state crack control. The allowable crack width depends on the self-healing ability of concrete and the use of supplementary cementitious material like fly ash in concrete mixes might affect it. Therefore, an experimental investigation was carried out to find the influence of fly ash on self-healing process. Water is sent through artificially induced cracks in a specimen for autogenous healing to take place at a constant pressure gradient across the specimen. To determine the level of self-healing, the flow through the crack was measured with time to obtain the sealing time. Fly ash percentages of 20%, 30% and 40% were tested along with a 0% fly ash mix. Insignificant variation was shown for initial drop in flow rate across fly ash percentages used in this study. Significant reduction in sealing time was observed for 20% and 30% fly ash mixes as compared to 0% fly ash whereas higher fly ash percentages (40%) showed insignificant reduction.
{"title":"Effect of Fly Ash on Self-healing of Cracks in Concrete","authors":"Kc Ratnayake, S. Nanayakkara","doi":"10.1109/MERCON.2018.8421952","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421952","url":null,"abstract":"The design of water retaining structures is mainly based on the serviceability limit state crack control. The allowable crack width depends on the self-healing ability of concrete and the use of supplementary cementitious material like fly ash in concrete mixes might affect it. Therefore, an experimental investigation was carried out to find the influence of fly ash on self-healing process. Water is sent through artificially induced cracks in a specimen for autogenous healing to take place at a constant pressure gradient across the specimen. To determine the level of self-healing, the flow through the crack was measured with time to obtain the sealing time. Fly ash percentages of 20%, 30% and 40% were tested along with a 0% fly ash mix. Insignificant variation was shown for initial drop in flow rate across fly ash percentages used in this study. Significant reduction in sealing time was observed for 20% and 30% fly ash mixes as compared to 0% fly ash whereas higher fly ash percentages (40%) showed insignificant reduction.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"5 1","pages":"264-269"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89285344","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421965
S.A.I.B.S. Arachchi, I. Perera
Agile practices with Continuous Integration and Continuous Delivery (CICD) pipeline approach has increased the efficiency of projects. In agile, new features are introduced to the system in each sprint delivery, and although it may be well developed, the delivery failures are possible due to performance issues. By considering delivery timeline, moving for system scaling is common solution in such situations. But, how much system should be scaled? System scale requires current system benchmark status and expected system status. Benchmarking the production is a critical task, as it interrupts the live system. The new version should go through a load test to measure expected system status. The traditional load test methods are unable to identify production performance behavior due to simulated traffic patterns are highly deviated from production. To overcome those issues, this approach has extended CICD pipeline to have three automation phases named benchmark, load test and scaling. It minimizes the system interruption by using test bench approach when system benchmarking and it uses the production traffic for load testing which gives more accurate results. Once benchmark and load test phases are completed, system scaling can be evaluated. Initially, the pipeline was developed using Jenkins CI server, Git repository and Nexus repository with Ansible automation. Then GoReplay is used for traffic duplication from production to test bench environment. Nagios monitoring is used to analyze the system behavior in each phase and the result of test bench has proven that scaling is capable to handle the same load while changing the application software, but it doesn't optimize response time of application at significant level and it helps to reduce the risk of application deployment by integrating this three phase approach as CICD automation extended feature. Thereby the research provides effective way to manage Agile based CICD projects.
{"title":"Continuous Integration and Continuous Delivery Pipeline Automation for Agile Software Project Management","authors":"S.A.I.B.S. Arachchi, I. Perera","doi":"10.1109/MERCON.2018.8421965","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421965","url":null,"abstract":"Agile practices with Continuous Integration and Continuous Delivery (CICD) pipeline approach has increased the efficiency of projects. In agile, new features are introduced to the system in each sprint delivery, and although it may be well developed, the delivery failures are possible due to performance issues. By considering delivery timeline, moving for system scaling is common solution in such situations. But, how much system should be scaled? System scale requires current system benchmark status and expected system status. Benchmarking the production is a critical task, as it interrupts the live system. The new version should go through a load test to measure expected system status. The traditional load test methods are unable to identify production performance behavior due to simulated traffic patterns are highly deviated from production. To overcome those issues, this approach has extended CICD pipeline to have three automation phases named benchmark, load test and scaling. It minimizes the system interruption by using test bench approach when system benchmarking and it uses the production traffic for load testing which gives more accurate results. Once benchmark and load test phases are completed, system scaling can be evaluated. Initially, the pipeline was developed using Jenkins CI server, Git repository and Nexus repository with Ansible automation. Then GoReplay is used for traffic duplication from production to test bench environment. Nagios monitoring is used to analyze the system behavior in each phase and the result of test bench has proven that scaling is capable to handle the same load while changing the application software, but it doesn't optimize response time of application at significant level and it helps to reduce the risk of application deployment by integrating this three phase approach as CICD automation extended feature. Thereby the research provides effective way to manage Agile based CICD projects.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"148 1","pages":"156-161"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73685003","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421968
K. V. Jeeva Padmini, P. Kankanamge, H. Bandara, G. Perera
In the agile framework developers and testers are part of a hyper-productive, self-organizing team. Testing scope changes when user stories are added, updated, or deleted. Moreover, test cases need to be re-written or update when user stories change or removed from the sprint, which wastes time and makes agile testers frustrated. Furthermore, the mini-waterfall model adopted within a sprint could develop unwanted stress in agile testers. Despite these challenges little seem to be understood about the challenges faced by agile testers. We fill this gap by closely studying the challenges faced by agile testers in a multinational IT services organization. We first set up a forum for agile testers to discuss their challenges, malpractices, and best practices. We then conducted an online survey based on the findings from the forum and literature review. Through this, we identified 15 challenges and best practices to overcome those 15 challenges. We further conducted a set of interviews with the subject matter expertise to identify a suitable set of solutions such as conducting retrospective in a fun and engaging way, managing story lifecycle using collaborative tools, setting up ground rules for geographically distributed teams, and introducing innovative sprints.
{"title":"Challenges Faced by Agile Testers: A Case Study","authors":"K. V. Jeeva Padmini, P. Kankanamge, H. Bandara, G. Perera","doi":"10.1109/MERCON.2018.8421968","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421968","url":null,"abstract":"In the agile framework developers and testers are part of a hyper-productive, self-organizing team. Testing scope changes when user stories are added, updated, or deleted. Moreover, test cases need to be re-written or update when user stories change or removed from the sprint, which wastes time and makes agile testers frustrated. Furthermore, the mini-waterfall model adopted within a sprint could develop unwanted stress in agile testers. Despite these challenges little seem to be understood about the challenges faced by agile testers. We fill this gap by closely studying the challenges faced by agile testers in a multinational IT services organization. We first set up a forum for agile testers to discuss their challenges, malpractices, and best practices. We then conducted an online survey based on the findings from the forum and literature review. Through this, we identified 15 challenges and best practices to overcome those 15 challenges. We further conducted a set of interviews with the subject matter expertise to identify a suitable set of solutions such as conducting retrospective in a fun and engaging way, managing story lifecycle using collaborative tools, setting up ground rules for geographically distributed teams, and introducing innovative sprints.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"21 1","pages":"431-436"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74134452","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421894
Nilani Algiryage
Web crawlers are programs or automated scripts that scan web pages methodically to create indexes. Search engines such as Google, Bing use crawlers in order to provide web surfers with relevant information. Today there are also many crawlers that impersonate well-known web crawlers. For example, it has been observed that Google’s Googlebot crawler is impersonated to a high degree. This raises ethical and security concerns as they can potentially be used for malicious purposes. In this paper, we present an effective methodology to detect fake Googlebot crawlers by analyzing web access logs. We propose using Markov chain models to learn profiles of real and fake Googlebots based on their patterns of web resource access sequences. We have calculated log-odds ratios for a given set of crawler sessions and our results show that the higher the log-odds score, the higher the probability that a given sequence comes from the real Googlebot. Experimental results show, at a threshold log-odds score we can distinguish the real Googlebot from the fake.
{"title":"Distinguishing Real Web Crawlers from Fakes: Googlebot Example","authors":"Nilani Algiryage","doi":"10.1109/MERCON.2018.8421894","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421894","url":null,"abstract":"Web crawlers are programs or automated scripts that scan web pages methodically to create indexes. Search engines such as Google, Bing use crawlers in order to provide web surfers with relevant information. Today there are also many crawlers that impersonate well-known web crawlers. For example, it has been observed that Google’s Googlebot crawler is impersonated to a high degree. This raises ethical and security concerns as they can potentially be used for malicious purposes. In this paper, we present an effective methodology to detect fake Googlebot crawlers by analyzing web access logs. We propose using Markov chain models to learn profiles of real and fake Googlebots based on their patterns of web resource access sequences. We have calculated log-odds ratios for a given set of crawler sessions and our results show that the higher the log-odds score, the higher the probability that a given sequence comes from the real Googlebot. Experimental results show, at a threshold log-odds score we can distinguish the real Googlebot from the fake.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"214 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73791574","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421897
Sachinthana Pathiranage, Ishara Paranawithana, Monty Perera, A. C. De Silva
In recent times, Steady State Visually Evoked Potentials (SSVEP) based BCI have gained popularity over different types of brain signals as they prove to demonstrate interesting results. It is important to understand the behavior of brain signals with the change of frequency and distance to the stimuli used to evoke them. In this paper, we have looked at the behavior of the SSVEP signals over 4 varying stimuli frequencies and 4 varying distances between the subject and the stimulus. It was found that the strongest SSVEP were elicited in the lower frequency range around 8Hz and a distance up to 100 cm can have a significant effect on the elicited SSVEP signals.
{"title":"An In-depth Study of SSVEP Signals Against Stimulus Frequency and Distance to the Stimulus","authors":"Sachinthana Pathiranage, Ishara Paranawithana, Monty Perera, A. C. De Silva","doi":"10.1109/MERCON.2018.8421897","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421897","url":null,"abstract":"In recent times, Steady State Visually Evoked Potentials (SSVEP) based BCI have gained popularity over different types of brain signals as they prove to demonstrate interesting results. It is important to understand the behavior of brain signals with the change of frequency and distance to the stimuli used to evoke them. In this paper, we have looked at the behavior of the SSVEP signals over 4 varying stimuli frequencies and 4 varying distances between the subject and the stimulus. It was found that the strongest SSVEP were elicited in the lower frequency range around 8Hz and a distance up to 100 cm can have a significant effect on the elicited SSVEP signals.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"25 1","pages":"60-65"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75182353","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421930
O. P. C. Randil, H. Mallikarachchi
Full-field deformation measurements plays a vital role in designing, monitoring and retrofitting many engineering products ranging from civil engineering structure to aerospace applications. Optics-based measurements have gained a vast popularity over last two decades. This paper attempts to establish a method in measuring displacements in a 3D environment, using optics-based measurements, in a cost-effective manner. The study focuses on measuring displacements of a moving object with two stationary cameras. Images acquired from two cameras are processed through MATLAB software package and selected region of the object is reconstructed in a virtual 3D environment at each step. Digital image correlation technique is then adopted to measure displacement by comparing the coordinates of reconstructed objects in each step. It is shown that the displacements can be measured to an accuracy of 0.15 mm (in 20 mm) for the selected object giving an accuracy of 98%.
{"title":"3D Full-Field Deformation Measuring Technique with Optics-Based Measurements","authors":"O. P. C. Randil, H. Mallikarachchi","doi":"10.1109/MERCON.2018.8421930","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421930","url":null,"abstract":"Full-field deformation measurements plays a vital role in designing, monitoring and retrofitting many engineering products ranging from civil engineering structure to aerospace applications. Optics-based measurements have gained a vast popularity over last two decades. This paper attempts to establish a method in measuring displacements in a 3D environment, using optics-based measurements, in a cost-effective manner. The study focuses on measuring displacements of a moving object with two stationary cameras. Images acquired from two cameras are processed through MATLAB software package and selected region of the object is reconstructed in a virtual 3D environment at each step. Digital image correlation technique is then adopted to measure displacement by comparing the coordinates of reconstructed objects in each step. It is shown that the displacements can be measured to an accuracy of 0.15 mm (in 20 mm) for the selected object giving an accuracy of 98%.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"56 1","pages":"179-184"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72676258","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421893
A. Abeysinghe, K. Waidyasekara, D. G. Melagoda
There is a significant contribution of materials to be handled, transferred, and used; further, large logistics operations are related to transporting, storing, moving, and reloading in large scale construction projects. Thus, the research aims to investigate issues that occur beyond the site, material handling, and transportation in large-scale construction projects. Accordingly, extensive literature was synthesized to identify the usage of materials in large-scale construction projects, their significance, and procedures of material handling and transportation. This study adopted a qualitative research approach by selecting a multiple case study strategy. Five large-scale construction projects in Colombo Metropolitan area were selected and semi-structured interviews were conducted with three different levels of site personnel from each case study. Finally, the gathered information was analyzed using computer-based content analysis and further supported by data collected through observations. The outcomes disclosed various issues in material handling and transportation with respective causes and possible solutions to minimize identified issues in large scale construction projects. Accidents, adverse weather conditions, lack of material handling equipment, lack of labors, improper packing systems, misplace and steal of materials, lack of pre-arrangements, bulk quantities, limited site area, delay in taking approvals, improper supervision and unawareness of the handling process were identified as common material handling and transportation issues. It was identified these can be mitigated by proper supervision, providing a manual to handle each material, labeling material, maintaining good communication with laborers and arranging a gate pass system. Further, recommendations for improving material handling and transportation were provided for industry practitioners.
{"title":"Beyond Site Material Handling and Transportation in Large-Scale Construction Projects","authors":"A. Abeysinghe, K. Waidyasekara, D. G. Melagoda","doi":"10.1109/MERCON.2018.8421893","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421893","url":null,"abstract":"There is a significant contribution of materials to be handled, transferred, and used; further, large logistics operations are related to transporting, storing, moving, and reloading in large scale construction projects. Thus, the research aims to investigate issues that occur beyond the site, material handling, and transportation in large-scale construction projects. Accordingly, extensive literature was synthesized to identify the usage of materials in large-scale construction projects, their significance, and procedures of material handling and transportation. This study adopted a qualitative research approach by selecting a multiple case study strategy. Five large-scale construction projects in Colombo Metropolitan area were selected and semi-structured interviews were conducted with three different levels of site personnel from each case study. Finally, the gathered information was analyzed using computer-based content analysis and further supported by data collected through observations. The outcomes disclosed various issues in material handling and transportation with respective causes and possible solutions to minimize identified issues in large scale construction projects. Accidents, adverse weather conditions, lack of material handling equipment, lack of labors, improper packing systems, misplace and steal of materials, lack of pre-arrangements, bulk quantities, limited site area, delay in taking approvals, improper supervision and unawareness of the handling process were identified as common material handling and transportation issues. It was identified these can be mitigated by proper supervision, providing a manual to handle each material, labeling material, maintaining good communication with laborers and arranging a gate pass system. Further, recommendations for improving material handling and transportation were provided for industry practitioners.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"233 1","pages":"66-71"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87278846","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}
Pub Date : 2018-05-01DOI: 10.1109/MERCON.2018.8421967
S. Arshad, Asanka S. Rodrigo
Metal Oxide Surge Arresters (MOSA) are proven to be reliable protective devices for power distribution and electrical transmission system. MOSA are subjected to electrical ageing or degradation due to constant AC conduction or transient voltages. Leakage current measured from surge arresters are used to observe its degradation and the resistive leakage component is extracted from the total to determine the health of the surge arresters. If resistive current increases, life of the surge arresters decreases. Generally, leakage current is measured using current shunts or current transformers where it’s necessary to measure the applied voltage which is very hard to measure in online condition. This paper develops an easy and accurate method to separate the resistive leakage current from the total leakage current without any voltage measurements by using a technique called Modified Phase Shifted Method (MPSM) and simulated in MATLAB which enables online monitoring system and easy to apply into a device.
{"title":"Modified Phase Shifting of Leakage Current to Condition Monitoring of Metal Oxide Surge Arresters in Power System","authors":"S. Arshad, Asanka S. Rodrigo","doi":"10.1109/MERCON.2018.8421967","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421967","url":null,"abstract":"Metal Oxide Surge Arresters (MOSA) are proven to be reliable protective devices for power distribution and electrical transmission system. MOSA are subjected to electrical ageing or degradation due to constant AC conduction or transient voltages. Leakage current measured from surge arresters are used to observe its degradation and the resistive leakage component is extracted from the total to determine the health of the surge arresters. If resistive current increases, life of the surge arresters decreases. Generally, leakage current is measured using current shunts or current transformers where it’s necessary to measure the applied voltage which is very hard to measure in online condition. This paper develops an easy and accurate method to separate the resistive leakage current from the total leakage current without any voltage measurements by using a technique called Modified Phase Shifted Method (MPSM) and simulated in MATLAB which enables online monitoring system and easy to apply into a device.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"17 1","pages":"300-305"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82773910","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}
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