Pub Date : 2016-04-05DOI: 10.1109/MERCON.2016.7480131
W. A. H. R. Weerathunge, D. Bandara, M. G. B. Amaratunga, A. C. De Silva
At present, 2 to 4 out of every 1000 births are affected with hearing impairments. In enforcing mandatory hearing screening for neonates, robust algorithms are required to make the process fast and efficient. In this paper, we present a novel algorithm to automate objective hearing screening using auditory brainstem response (referred to as ABR). An effective stimulus delivery mechanism, an efficient signal processing algorithm and an automatic peak detection algorithm are consolidated to reduce test time while maintaining accuracy. Simultaneously, compensation for ambient noise levels in clinical environments as opposed to sound proof environments are also considered. The Chirp Stimulus, Empirical Mode Decomposition and High Curvature Detection have been rigorously verified by MATLAB® simulations for data collected by ADInstruments® PowerLab. The algorithms utilized in screening reduce testing time to 8% of the gold standard hearing screening procedure, i.e. Click Stimulus based synchronized averaging. Moreover, the resultant ABR waveforms acquired are de-noised making them comparatively convenient to diagnose. The findings highlighted in the paper provide a superior methodology for robust and accurate newborn hearing screening compared to existing gold standard procedure.
{"title":"Robust algorithm for objective hearing screening of newborns using Automated Auditory Brain-stem Response","authors":"W. A. H. R. Weerathunge, D. Bandara, M. G. B. Amaratunga, A. C. De Silva","doi":"10.1109/MERCON.2016.7480131","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480131","url":null,"abstract":"At present, 2 to 4 out of every 1000 births are affected with hearing impairments. In enforcing mandatory hearing screening for neonates, robust algorithms are required to make the process fast and efficient. In this paper, we present a novel algorithm to automate objective hearing screening using auditory brainstem response (referred to as ABR). An effective stimulus delivery mechanism, an efficient signal processing algorithm and an automatic peak detection algorithm are consolidated to reduce test time while maintaining accuracy. Simultaneously, compensation for ambient noise levels in clinical environments as opposed to sound proof environments are also considered. The Chirp Stimulus, Empirical Mode Decomposition and High Curvature Detection have been rigorously verified by MATLAB® simulations for data collected by ADInstruments® PowerLab. The algorithms utilized in screening reduce testing time to 8% of the gold standard hearing screening procedure, i.e. Click Stimulus based synchronized averaging. Moreover, the resultant ABR waveforms acquired are de-noised making them comparatively convenient to diagnose. The findings highlighted in the paper provide a superior methodology for robust and accurate newborn hearing screening compared to existing gold standard procedure.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127731444","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480172
K. P. Deashapriya, P. Sampath, W. Wijekoon, N. Jayaweera, A. Kulasekera
Conventional robot manipulators have singularities in their workspaces and constrained spatial movements. Flexible and soft robots provide a unique solution to overcome this limitation. Flexible robot arms have biologically inspired characteristics as flexible limbs and redundant degrees of freedom. From these special characteristics, flexible manipulators are able to develop abilities such as bend, stretch and adjusting stiffness to traverse a complex maze. Many researchers are working to improve capabilities of flexible arms by improving the number of degrees of freedoms and their methodologies. The proposed flexible robot arm is composed of multiple sections and each section contains three similar segments and a base segment. These segments act as the backbone of the basic structure and each section can be controlled by changing the length of three control wires. These control wires pass through each segment and are held in place by springs. This design provides each segment with 2 DOF. The proposed system single section can be bent 90° with respective to its centre axis. Kinematics of the flexible robot is derived with respect to the base segment.
{"title":"Biomimetic flexible robot arm design and kinematic analysis of a novel flexible robot arm","authors":"K. P. Deashapriya, P. Sampath, W. Wijekoon, N. Jayaweera, A. Kulasekera","doi":"10.1109/MERCON.2016.7480172","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480172","url":null,"abstract":"Conventional robot manipulators have singularities in their workspaces and constrained spatial movements. Flexible and soft robots provide a unique solution to overcome this limitation. Flexible robot arms have biologically inspired characteristics as flexible limbs and redundant degrees of freedom. From these special characteristics, flexible manipulators are able to develop abilities such as bend, stretch and adjusting stiffness to traverse a complex maze. Many researchers are working to improve capabilities of flexible arms by improving the number of degrees of freedoms and their methodologies. The proposed flexible robot arm is composed of multiple sections and each section contains three similar segments and a base segment. These segments act as the backbone of the basic structure and each section can be controlled by changing the length of three control wires. These control wires pass through each segment and are held in place by springs. This design provides each segment with 2 DOF. The proposed system single section can be bent 90° with respective to its centre axis. Kinematics of the flexible robot is derived with respect to the base segment.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127749483","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480148
C. Gamage, J. M. Nupehewa, K. K. J. Kodikara, S. Chathuranga, R. Samarasinghe, J. R. Lucas
Capacitance and tan δ measurements are usually carried out to check the healthiness of an insulation. Measuring equipment based on different methodologies to test insulation in cables, transformer bushings etc. are available. This paper presents the development of such a measuring equipment for a high voltage (HV) laboratory of a University. The design is divided into three parts as filter unit, test unit, and the measuring unit. These units are separately modeled and simulated using software (MATLAB and PSpice). Filter unit and the test unit are combined to analyze the results through simulation. Simulation results are used to improve the design.
{"title":"Capacitance and tan δ measuring equipment for high voltage insulation modelling and simulation","authors":"C. Gamage, J. M. Nupehewa, K. K. J. Kodikara, S. Chathuranga, R. Samarasinghe, J. R. Lucas","doi":"10.1109/MERCON.2016.7480148","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480148","url":null,"abstract":"Capacitance and tan δ measurements are usually carried out to check the healthiness of an insulation. Measuring equipment based on different methodologies to test insulation in cables, transformer bushings etc. are available. This paper presents the development of such a measuring equipment for a high voltage (HV) laboratory of a University. The design is divided into three parts as filter unit, test unit, and the measuring unit. These units are separately modeled and simulated using software (MATLAB and PSpice). Filter unit and the test unit are combined to analyze the results through simulation. Simulation results are used to improve the design.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127872738","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480178
E. Edirisinghe, R. Lakmal, T. Lakshitha, S. Sirimanna, A. G. Buddhika P. Jayasekara
Service robots are used in a vast range of service applications. Domestic service robots have the requirement of a human-like appearance and inevitably a human-like interactive behaviors. In this paper, a human-like robot head mechanism is proposed while including the features of eye mechanism, neck mechanism in addition to its human-like appearance. This design is done identifying the average human eye and neck in each movement for more human-like interaction. In addition, the implementation of human emotions using a combination of eye and neck movements is also discussed in this paper. Basic human emotions as a response to an input given to the robot head are also analyzed.
{"title":"Design of a human-like robot head with emotions","authors":"E. Edirisinghe, R. Lakmal, T. Lakshitha, S. Sirimanna, A. G. Buddhika P. Jayasekara","doi":"10.1109/MERCON.2016.7480178","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480178","url":null,"abstract":"Service robots are used in a vast range of service applications. Domestic service robots have the requirement of a human-like appearance and inevitably a human-like interactive behaviors. In this paper, a human-like robot head mechanism is proposed while including the features of eye mechanism, neck mechanism in addition to its human-like appearance. This design is done identifying the average human eye and neck in each movement for more human-like interaction. In addition, the implementation of human emotions using a combination of eye and neck movements is also discussed in this paper. Basic human emotions as a response to an input given to the robot head are also analyzed.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127178237","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480149
N. Sameera, J. A. P. A. Ovinda, N. A. Palayangoda, A. D. Sanjeewa, S. Abeygunawardane
Demand side management provides benefits to both the utility and the consumers. The effective implementation of demand side management can be achieved by introducing a proper energy management system. To popularize such an energy management system among domestic consumers in developing countries, initial cost of the system should be affordable and it should be able to assist the consumers to significantly reduce their electricity bill. This paper proposes a smart energy tracking system that can monitor the energy usage at different time slots, compare the energy usage with past data and provide details about the daily energy usage and helpful instructions to manage the energy consumption. Hence, the proposed system assists the consumers to reduce their electricity bill and the utilities to implement demand side management in the domestic sector.
{"title":"Smart energy tracking system for domestic consumers","authors":"N. Sameera, J. A. P. A. Ovinda, N. A. Palayangoda, A. D. Sanjeewa, S. Abeygunawardane","doi":"10.1109/MERCON.2016.7480149","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480149","url":null,"abstract":"Demand side management provides benefits to both the utility and the consumers. The effective implementation of demand side management can be achieved by introducing a proper energy management system. To popularize such an energy management system among domestic consumers in developing countries, initial cost of the system should be affordable and it should be able to assist the consumers to significantly reduce their electricity bill. This paper proposes a smart energy tracking system that can monitor the energy usage at different time slots, compare the energy usage with past data and provide details about the daily energy usage and helpful instructions to manage the energy consumption. Hence, the proposed system assists the consumers to reduce their electricity bill and the utilities to implement demand side management in the domestic sector.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128411965","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480150
N. Wickramarachchi, W. Amaradasa, H. K. J. Amarasinghe, H. K. T. R. Karunarathna, W. Wijekoon
Testing of MCBs involve sending a preset current through the MCB under test until it trips or if not for a pre-defined period of time. The operational state of the MCB should be recorded for variable currents. Automation of the testing process for household MCBs is presented in this paper. This paper includes design of the testing process and simulation of the controllable current source. Maximum current which can be injected by the current source is 390 A for a short time duration.
{"title":"Design and construction of an automated test bench for MCB testing","authors":"N. Wickramarachchi, W. Amaradasa, H. K. J. Amarasinghe, H. K. T. R. Karunarathna, W. Wijekoon","doi":"10.1109/MERCON.2016.7480150","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480150","url":null,"abstract":"Testing of MCBs involve sending a preset current through the MCB under test until it trips or if not for a pre-defined period of time. The operational state of the MCB should be recorded for variable currents. Automation of the testing process for household MCBs is presented in this paper. This paper includes design of the testing process and simulation of the controllable current source. Maximum current which can be injected by the current source is 390 A for a short time duration.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"154 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114017803","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480153
Vithyashini Sethuraman, B. Perera, D. Sumanarathna
Procurement is considered as a standard procedure accepted as an approach for delivering construction projects. Construction projects can be categorised in to two major classifications as building construction projects and infrastructure construction projects. This study is intended to focus on as to whether there is any significant difference between procurement selection criteria adopted in building and infrastructure construction projects. To analyse this issue, efforts were made to identify and analyse an assortment of parameters which can influence the selection of the procurement method. Three rounds of extensive Delphi survey were conducted through the quantitative approach with the assistance of thirty four industry experts towards identifying a set of parameters and their degree of influence on infrastructure and building construction procurement adoption. Analysis revealed the most important parameters which influence the choice of the procurement method in both infrastructure and building construction and the relationship between the selection criteria of the procurement method in the two categories of construction was identified through the application of Pearson's Correlation Coefficient. Having concerned on the level of significance of all the identified parameters it is guided in selecting a proper procurement path to derive a successful project outcome.
{"title":"Factors influencing procurement adoption in construction: Building vs infrastructure projects","authors":"Vithyashini Sethuraman, B. Perera, D. Sumanarathna","doi":"10.1109/MERCON.2016.7480153","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480153","url":null,"abstract":"Procurement is considered as a standard procedure accepted as an approach for delivering construction projects. Construction projects can be categorised in to two major classifications as building construction projects and infrastructure construction projects. This study is intended to focus on as to whether there is any significant difference between procurement selection criteria adopted in building and infrastructure construction projects. To analyse this issue, efforts were made to identify and analyse an assortment of parameters which can influence the selection of the procurement method. Three rounds of extensive Delphi survey were conducted through the quantitative approach with the assistance of thirty four industry experts towards identifying a set of parameters and their degree of influence on infrastructure and building construction procurement adoption. Analysis revealed the most important parameters which influence the choice of the procurement method in both infrastructure and building construction and the relationship between the selection criteria of the procurement method in the two categories of construction was identified through the application of Pearson's Correlation Coefficient. Having concerned on the level of significance of all the identified parameters it is guided in selecting a proper procurement path to derive a successful project outcome.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116304698","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480144
T. Weerasinghe, S. Nanayakkara
Plastic shrinkage cracking is a common phenomenon associated with concreting in hot and windy weather. Excess evaporation of bleed water causes loss of water from the concrete surface and plastic shrinkage occurs due to that at very early stage i.e. within the first 4-6 hours. Tensile strain will be developed as a result of this shrinkage and cracking will occur when it exceeds the tensile strain capacity of concrete. This paper is aimed at developing a model to simulate such behavior and determine the tensile strain development with time. First, key factors affecting shrinkage, bleeding and evaporation, were modelled and the starting time of drying was identified. Subsequent loss of water was calculated and incorporated in a finite element model to simulate the tensile strain development. Calculated strains were very similar to the measured strains and therefore the model can be used to accurately predict the development of early age tensile strain due to plastic shrinkage.
{"title":"Modelling of early age tensile strain development of fresh concrete","authors":"T. Weerasinghe, S. Nanayakkara","doi":"10.1109/MERCON.2016.7480144","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480144","url":null,"abstract":"Plastic shrinkage cracking is a common phenomenon associated with concreting in hot and windy weather. Excess evaporation of bleed water causes loss of water from the concrete surface and plastic shrinkage occurs due to that at very early stage i.e. within the first 4-6 hours. Tensile strain will be developed as a result of this shrinkage and cracking will occur when it exceeds the tensile strain capacity of concrete. This paper is aimed at developing a model to simulate such behavior and determine the tensile strain development with time. First, key factors affecting shrinkage, bleeding and evaporation, were modelled and the starting time of drying was identified. Subsequent loss of water was calculated and incorporated in a finite element model to simulate the tensile strain development. Calculated strains were very similar to the measured strains and therefore the model can be used to accurately predict the development of early age tensile strain due to plastic shrinkage.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133018035","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480146
W. Wickramaarachchi, M. Narayana
North Western coastal area of Sri Lanka is identified as a region with substantial wind power potential. Favorable geographical location and the terrain conditions have effected for higher wind power generation. Presently, the Sri Lankan government is promoting wind power generation in the country. This study is intended to evaluate impact of climate change on wind power generation in Mannar area. Wind data collected in Mannar was used to develop generalized wind atlas for the region. To generate wind atlas for the region measured wind data, topography and elevation details are required. To evaluate cost of wind energy generation in Mannar, suitable commercial wind turbines were micro-sitted by superimposing generalized wind atlas on selected wind turbine locations with the effect of ground roughness. Wind power generation was evaluated by considering wind turbine characteristics and predicted wind potential of the locations. General Circulation Models (GCM) and Regional Climate Downscaling (RCD) model was predicted wind speed change trend in the region and positive trend was identified. In the micro-sitting wake effect in wind farms were also calculated. This study validated the potential of wind power development target in Mannar with viable cost of wind energy generation.
{"title":"Impact of climate change on wind energy generation in Mannar-Sri Lanka","authors":"W. Wickramaarachchi, M. Narayana","doi":"10.1109/MERCON.2016.7480146","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480146","url":null,"abstract":"North Western coastal area of Sri Lanka is identified as a region with substantial wind power potential. Favorable geographical location and the terrain conditions have effected for higher wind power generation. Presently, the Sri Lankan government is promoting wind power generation in the country. This study is intended to evaluate impact of climate change on wind power generation in Mannar area. Wind data collected in Mannar was used to develop generalized wind atlas for the region. To generate wind atlas for the region measured wind data, topography and elevation details are required. To evaluate cost of wind energy generation in Mannar, suitable commercial wind turbines were micro-sitted by superimposing generalized wind atlas on selected wind turbine locations with the effect of ground roughness. Wind power generation was evaluated by considering wind turbine characteristics and predicted wind potential of the locations. General Circulation Models (GCM) and Regional Climate Downscaling (RCD) model was predicted wind speed change trend in the region and positive trend was identified. In the micro-sitting wake effect in wind farms were also calculated. This study validated the potential of wind power development target in Mannar with viable cost of wind energy generation.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130448281","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 : 2016-04-05DOI: 10.1109/MERCON.2016.7480134
M. Udantha, Surangika Ranathunga, G. Dias
Web logs can provide a wealth of information on user access patterns of a corresponding website, when they are properly analyzed. However, finding interesting patterns hidden in the low-level log data is non-trivial due to large log volumes, and the distribution of the log files in cluster environments. This paper presents a novel technique, the application of Density-Based Spatial Clustering of Applications with Noise (DBSCAN) and Expectation Maximization (EM) algorithms in an iterative manner for clustering web user sessions. Each cluster corresponds to one or more web user activities. The unique user access pattern of each cluster is identified by frequent pattern mining and sequential pattern mining techniques. When compared with the clustering output of EM, DBSCAN, and k-means algorithms, this technique shows better accuracy in web session mining, and it is more effective in identifying cluster changes with time. We demonstrate that the implemented system is capable of not only identifying common user behaviors, but also of identifying cyber-attacks.
{"title":"Modelling website user behaviors by combining the EM and DBSCAN algorithms","authors":"M. Udantha, Surangika Ranathunga, G. Dias","doi":"10.1109/MERCON.2016.7480134","DOIUrl":"https://doi.org/10.1109/MERCON.2016.7480134","url":null,"abstract":"Web logs can provide a wealth of information on user access patterns of a corresponding website, when they are properly analyzed. However, finding interesting patterns hidden in the low-level log data is non-trivial due to large log volumes, and the distribution of the log files in cluster environments. This paper presents a novel technique, the application of Density-Based Spatial Clustering of Applications with Noise (DBSCAN) and Expectation Maximization (EM) algorithms in an iterative manner for clustering web user sessions. Each cluster corresponds to one or more web user activities. The unique user access pattern of each cluster is identified by frequent pattern mining and sequential pattern mining techniques. When compared with the clustering output of EM, DBSCAN, and k-means algorithms, this technique shows better accuracy in web session mining, and it is more effective in identifying cluster changes with time. We demonstrate that the implemented system is capable of not only identifying common user behaviors, but also of identifying cyber-attacks.","PeriodicalId":184790,"journal":{"name":"2016 Moratuwa Engineering Research Conference (MERCon)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116310736","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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