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C-JAE: 3 DOF Robotic Ankle Exoskeleton with Compatible Joint Axes C-JAE:具有兼容关节轴的3自由度机器人踝关节外骨骼
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8422004
A. Weerasingha, A.D.K.H. Pragnathilaka, W. Withanage, R. Ranaweera, R. Gopura
{"title":"C-JAE: 3 DOF Robotic Ankle Exoskeleton with Compatible Joint Axes","authors":"A. Weerasingha, A.D.K.H. Pragnathilaka, W. Withanage, R. Ranaweera, R. Gopura","doi":"10.1109/MERCON.2018.8422004","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8422004","url":null,"abstract":"This paper proposes a three degrees of freedom (DOF) robotic ankle exoskeleton with compatible joint axes, named C-JAE. The device consists of three separate units to achieve triplanar motions. The plantarflexion-dorsiflexion and inversion-eversion are externally powered, whereas internal-external rotation is passively supported. C-JAE is capable of complying with the functional and ergonomic requirements of the biological ankle joint. This is achieved by accurately mapping exoskeleton axes of rotation with the oblique axes of rotation of talocrural and subtalar joints of ankle. All mechanisms including the drive units are located anterior to shank and foot segments to carry out robotic rehabilitation and/or to provide locomotion assistance for humans having mobility disorders. Control experiments were conducted to assess aptitude of C-JAE to carry out ankle rehabilitation exercises. The results verified potential benefits of the proposed design to generate desired movement patterns of daily activities while providing power-assistance.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"9 1","pages":"270-275"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84285651","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: 5
Development of a Vibration Energy Harvesting Device Using Piezoelectric Sensors 基于压电传感器的振动能量收集装置的研制
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421913
W. Jayarathne, W. A. T. Nimansala, S. Adikary
{"title":"Development of a Vibration Energy Harvesting Device Using Piezoelectric Sensors","authors":"W. Jayarathne, W. A. T. Nimansala, S. Adikary","doi":"10.1109/MERCON.2018.8421913","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421913","url":null,"abstract":"Piezoelectric energy harvesting has become popular among researchers because of the ease of converting mechanical energy into electrical energy using piezoelectric materials. In this context, a vibration energy harvesting device was developed to harvest vibration energy from vehicles. Lead zirconate titanate (PZT) was selected as the piezoelectric material. First the vibration sources were analyzed to identify the resonant frequency. Piezoelectric energy harvester was developed using the cantilever type configuration. Euler–Bernoulli beam theory was used to analyze the cantilever beam under free vibration. Finite element analysis (FEA) was used to identify the design parameters of the prototype which includes the metal beam, tip mass and the PZT plate. The maximum theoretical voltage was obtained as 5.99V according to the FEA modeling. The prototype was developed and voltage was measured fixing the prototype to the motor bike. The average voltage output was 3.65V.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"63 1","pages":"197-202"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87712909","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: 18
Log Periodic Antenna Based Partial Discharge Detector for Condition Monitoring of High Voltage Insulators 基于对数周期天线的高压绝缘子局部放电检测器
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421927
H. De Zoysa, M. G. D. Madushani, G. Siriwardhana, K. U. N. S. S. Wijethunge, J. R. Lucas, R. Samarasinghe
{"title":"Log Periodic Antenna Based Partial Discharge Detector for Condition Monitoring of High Voltage Insulators","authors":"H. De Zoysa, M. G. D. Madushani, G. Siriwardhana, K. U. N. S. S. Wijethunge, J. R. Lucas, R. Samarasinghe","doi":"10.1109/MERCON.2018.8421927","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421927","url":null,"abstract":"This paper discusses the use of electromagnetic method of partial discharge detection for detecting and localizing partial discharges in high voltage insulators. In a power system, the condition of power line insulation used in transmission and distribution networks play a vital role in providing an uninterrupted power supply. Partial discharges that form in the insulators may be one of the main reasons for the failure of power line insulators. Therefore, pre-identifying partial discharges in high voltage insulators is essential in maintaining a reliable power system. In this study, a log periodic antenna is designed in order to detect the electromagnetic signals emitted from partial discharges, which are in a wide frequency band. Although the acoustic method can be used to localize the source of partial discharges, background noise can interfere with the process. Thus, in order to detect the electromagnetic signals in the wide frequency band, a log periodic antenna in the range 0.9 – 2 GHz has been designed. To localize and measure the severity of the source of partial discharges on the insulators, the designed antenna is mounted on an unmanned aerial vehicle.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"76 1","pages":"477-481"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83841942","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
Clustering Sinhala News Articles Using Corpus-Based Similarity Measures 使用基于语料库的相似性度量聚类僧伽罗语新闻文章
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421890
P. Nanayakkara, Surangika Ranathunga
{"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}
引用次数: 9
Effect of Fly Ash on Self-healing of Cracks in Concrete 粉煤灰对混凝土裂缝自愈的影响
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421952
Kc Ratnayake, S. Nanayakkara
{"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}
引用次数: 2
Distinguishing Real Web Crawlers from Fakes: Googlebot Example 区分真正的网络爬虫和假货:Googlebot的例子
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421894
Nilani Algiryage
{"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}
引用次数: 6
An In-depth Study of SSVEP Signals Against Stimulus Frequency and Distance to the Stimulus SSVEP信号对刺激频率和距离的深入研究
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421897
Sachinthana Pathiranage, Ishara Paranawithana, Monty Perera, A. C. De Silva
{"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}
引用次数: 1
3D Full-Field Deformation Measuring Technique with Optics-Based Measurements 基于光学测量的三维全场变形测量技术
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421930
O. P. C. Randil, H. Mallikarachchi
{"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}
引用次数: 1
Beyond Site Material Handling and Transportation in Large-Scale Construction Projects 大型建筑项目中的现场物料搬运和运输
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421893
A. Abeysinghe, K. Waidyasekara, D. G. Melagoda
{"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}
引用次数: 0
Modified Phase Shifting of Leakage Current to Condition Monitoring of Metal Oxide Surge Arresters in Power System 电力系统金属氧化物避雷器状态监测中泄漏电流相移法的改进
2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421967
S. Arshad, Asanka S. Rodrigo
{"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}
引用次数: 3
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