Browsing by Author "Fernando, C"

Now showing 1 - 6 of 6

item: Article-Full-text
Chest X-ray analysis empowered with deep learning: A systematic review
(Elsevier, 2022) Meedeniya, D; Kumarasinghe, H; Kolonne, S; Fernando, C; Díez, IDLT; Marques, G
Chest radiographs are widely used in the medical domain and at present, chest X-radiation particularly plays an important role in the diagnosis of medical conditions such as pneumonia and COVID-19 disease. The recent developments of deep learning techniques led to a promising performance in medical image classification and prediction tasks. With the availability of chest X-ray datasets and emerging trends in data engineering techniques, there is a growth in recent related publications. Recently, there have been only a few survey papers that addressed chest X-ray classification using deep learning techniques. However, they lack the analysis of the trends of recent studies. This systematic review paper explores and provides a comprehensive analysis of the related studies that have used deep learning techniques to analyze chest X-ray images. We present the state-of-the-art deep learning based pneumonia and COVID-19 detection solutions, trends in recent studies, publicly available datasets, guidance to follow a deep learning process, challenges and potential future research directions in this domain. The discoveries and the conclusions of the reviewed work have been organized in a way that researchers and developers working in the same domain can use this work to support them in taking decisions on their research.
item: Conference-Abstract
Development of driving cycle for Sri Lanka
(Department of Civil Engineering, University of Moratuwa., 2012-07) Gamalath, I; Fernando, C; Galgamuwa, U; Perera, L; Bandara, JMSJ; Pasindu, HR
A driving cycle is a speed time profile which represents the driving characteristics of a selected area. This can be of use to legislative and non legislative purposes such as development of emission standard, determination of fuel consumption, etc. Established driving cycles such as European driving cycle and United States driving cycles cannot be used in Sri Lankan context as the traffic constituents, driver behaviour and road conditions vary significantly that from the conditions of those countries. Hence the objective of this research is to develop a standard driving cycle(s) which represent urban and rural conditions in Sri Lanka and to establish emission standards in future based on such cycle(s). To achieve stated objectives, it is necessary to collect and analyse on road speed-time data on a selected route which will represent the typical driving pattern of an urban or rural condition. Due the restriction of time and resources, this study was limited to development of driving cycle for urban condition and for light duty vehicles. However, this study would facilitate further studies on this area and development of driving cycles for urban, sub urban, rural and express way conditions and this could be of great use for traffic engineering studies, road safety and sustainable development. A sample driving cycle was developed based on the time series data collected on the Galle Road, section from Katubedda to Fort. Due to the time constraint, on board method was used to collect data using a hand held GPS device. More than 30 samples were collected in this section during different times of the day and different days of the week to represent many prevailing traffic conditions at this urban road section.
item: Conference-Full-text
Do the surrounding conditions of jogging tracks create stress in joggers? a case study of jogging tracks in suburban Sri Lanka
(Department of Architecture, University of Moratuwa, Sri Lanka, 2020-12-15) Fernando, C; Dayaratne, R
Urbanization has brought half of the world’s population into urban areas while transforming the way people live, work, travel and building network. Similarly, the urbanization made a significant impact on lifestyles in urban and sub-urban Sri Lanka. However, urbanization often brings stress to people's lives, and jogging has been found as one way of avoiding such busy environments. In Sri Lanka, there are few dedicated tracks for jogging in urban and suburban areas. Unfortunately, the absence of proper design and surroundings of a jogging track may result in increased stress of its users, i.e., joggers. This study examines the impact of design conditions and landscape features of jogging tracks in Sri Lanka towards the level of stress of joggers. We selected two jogging tracks in the capital of Sri Lanka, Sri Jayewardenepura Kotte as our case study. Further, we used online surveys and face to face interviews with joggers as data collection methods. We triangulated our data with experts’ opinions that are gathered from park managers and landscape architects in government authorities. Mixed methods are used to analyse the collected data. Our results identify six main factors that increase the level of stress of joggers, namely, temperature, seeing amphibians in the surrounding, excessive traffic noise, vehicle smoke, dust particles in the atmosphere, and level differences of the jogging tracks. This research further presents a set of recommendations for maintaining, restructuring, and developing jogging tracks in Sri Lanka in order to reduce the stress of joggers.
item: Conference-Full-text
Methodology to Develop a Driving Cycle for a Given Mode and Traffic Corridor; Case Study for Galle Road, Colombo, Sri Lanka
(2014-05-08) Gamalath, I; Fernando, C; Galgamuwa, U; Perera, L; Bandara, S
A driving cycle is a speed time profile which represents the driving characteristics of a selected area. This can be of use to both legislative and non legislative purposes such as development of emission inventory, determination of fuel consumption etc. As driving cycles are dependent on the traffic constituents, driver behaviour and road conditions established driving cycles cannot be used in Sri Lanka. Hence the objective of this research is to develop a methodology and to constructa driving cycle(s) which represent given set of conditions in Sri Lanka such that it can be use to establish emission inventory in future. To achieve these objectives, it is necessary to collect and analyse the on road speed-time data on selected routes which will represent the driving patterns of urban or rural conditions. Due to the restriction of time and resources, study was limited to one transport corridor, anurban condition and for light vehicles only. A sample driving cycle was developed based on the data collected on the Galle Road, section from Katubedda to Fort using on board method. Cycle was developed using micro trip based cycle construction and computer application was developed to aid this purpose. In this study we observed average speed 21.37km/h, average running speed 25.78km/h, average acceleration 2.03km/h/s and average deceleration 2.02km/h/s with acceleration, deceleration, cruising and idling proportions of 27.37%, 23.70%, 31.43% and 17.49% respectively for selected urban condition. This study would facilitate the further studies on development of driving cycles for other conditions and could be of use for traffic engineering studies as well as sustainable development.
item: Conference-Full-text
Methodology to develop a driving cycle for a given mode and traffic corridor; case study for Galle Road, Colombo, Sri Lanka
(Department of Civil Engineering, University of Moratuwa, 2012-12) Gamlath, I; Fernando, C; Galgamuwa, U; Perera, L; Bandara, S; Nawagamuwa, U; de Silva, LIN
A driving cycle is a speed time profile which represents the driving characteristics of a selected area. This can be of use to both legislative and non legislative purposes such as development of emission inventory, determination of fuel consumption etc. As driving cycles are dependent on the traffic constituents, driver behaviour and road conditions established driving cycles cannot be used in Sri Lanka. Hence the objective of this research is to develop a methodology and to constructa driving cycle(s) which represent given set of conditions in Sri Lanka such that it can be use to establish emission inventory in future. To achieve these objectives, it is necessary to collect and analyse the on road speed-time data on selected routes which will represent the driving patterns of urban or rural conditions. Due to the restriction of time and resources, study was limited to one transport corridor, anurban condition and for light vehicles only. A sample driving cycle was developed based on the data collected on the Galle Road, section from Katubedda to Fort using on board method. Cycle was developed using micro trip based cycle construction and computer application was developed to aid this purpose. In this study we observed average speed 21.37km/h, average running speed 25.78km/h, average acceleration 2.03km/h/s and average deceleration 2.02km/h/s with acceleration, deceleration, cruising and idling proportions of 27.37%, 23.70%, 31.43.6 and 17.49% respectively for selected urban condition. This study would facilitate the further studies on development of driving cycles for other conditions and could be of use for traffic engineering studies development.
item: Conference-Full-text
Strengthening of damaged out of plane curved reinforced concrete beam using carbon fiber reinforced polymer
(IEEE, 2020-07) Kulendren, S; Fernando, C; Gamage, P; Weeraddana, C; Edussooriya, CUS; Abeysooriya, RP
Curved major structures will get cracks and it will be costly and difficult to replace. So retrofitting technique in this paper will enable the engineers to retrofit these beams without replacing them. This experimental study aims at investigating the behaviour of damaged curved Reinforced Concrete (RC) beams strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets. Two sets of curved RC beam specimens, with 4000 mm radii were used. The beams were pre cracked and repaired by using epoxy grout prior to strengthening. The beams were retrofitted using an alternative bond arrangement of Near Surface Mounted (NSM) CFRP sheets. The specimens were tested under four-point bending test method. On average 51% increase in flexural gain was observed from retrofitted beams with respect to non-cracked control samples.