Browsing by Author "Weerasinghe, SN"

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item: Conference-Full-text
4onse – 4 times open and non-conventional technology for sensing the environment: an integrated low-cost environmental monitoring system (ems) for developing countries
(Information Technology Research Unit, Faculty of Information Technology, University of Moratuwa, Sri Lanka, 2017-12) Ratnayake, GR; Mahanama, PKS; Warusavitharana, EJ; Weerasinghe, SN; Warnakulasooriya, KMHK; Sudantha, BH; Jayasuriya, YP; Sudantha, BH
4 times Open & Non-conventional technologies for Sensing the Environment (4ONSE) is an ongoing joint research project between University of Moratuwa, Sri Lanka and University of Applied Sciences and Arts of Southern Switzerland. This project was initiated in a time where the necessity of a low-cost, non-conventional, and precise hydrometeorological monitoring system has been of great demand due to the increased number of weather-related environmental hazards and disasters in Sri Lanka. This work comprises an integrated approach to setting-up an experimental nonconventional Environment Monitoring System (EMS) based on open hardware, open software, open standards and open data which could measure the rainfall, wind speed, wind direction, relative humidity, air temperature, barometric pressure, soil moisture, light intensity, and the water level. With comparison to other available weather stations, this research argues the cost effectiveness of the 4ONSE system, in terms of its technology, hardware and software. Such a fully accessible, royalty-free and low cost system could provide developing countries with accessible technology for the so called ‘Internet of Things’ economy. Even though the use of technologically sound and low system is necessary to monitor the environmental data, less is known about use, validity, accuracy and cost effectiveness of such systems. This research explores the accuracy of 4ONSE’s measurements against those of a reference station and further explores and proves its effectiveness and suitability in terms of environmental monitoring in the context of developing countries.
item: Thesis-Abstract
Developing a strategy and an open module for N-SBC to eliminate DDOS attacks from sip based NGN IP interconnections
(2015-09-18) Weerasinghe, SN; Samarasinghe, K
The Session Initiation Protocol (SIP) is the communication protocol of the future. Used for Voice-over-IP (VoIP), Internet Multimedia Subsystem (IMS) and Internet Protocol Television (IPTV), SIP's concepts are based on mature and open standards and it is usage is increasing rapidly. However, with its acceptance as a mainstream communication platform, security concerns become ever more important for users and service providers. Usage of SIP for communication is currently spreading into the last mile of mobile and fixed line carriers making then very much vulnerable to the protocols ofthe internet domain. The posed threat can be understood by the increasing number of calls being initiated from the internet to mobile and fixed line devices. At the crust, in order to manage the threats coming in from the internet, operators usually go for tighter Security in the Session Boarder Gateway (SBC), the interface between internet and the operator's domain. Furthermore, rogue attempts to infiltrate the Operator's domain is now becoming a common occurrence and leading to losses beyond billions of dollars of revenue. Irony is that Operator's sometimes does not understand the scale of the exploitation until much later in the billing cycle. This thesis identifies the probable modes of attacks including DoS and DDoS, and provides a strategy and an implementation plan to identify these threats via pattern matching and heuristic logic which is built on leaning algorithms. Target is to introduce a solution capable of learning and identifying patterns which leads to DoS, DDoS attacks and eliminate the rogue communication threads from ever entering the realms of the operator. With this solution, general VOIP communications with Operators shall be more robust against DoS and Distributed DoS attacks and many other threats looming at the N-SBS level of an NGN network.
item: Article-Full-text
Local factors affecting the spatial diffusion of residential photovoltaic adoption in Sri Lanka
(Elsevier, 2018) Jayaweera, N; Jayasinghe, CL; Weerasinghe, SN
Literature has established many social, economic, residential and environmental factors affecting photovoltaics (PV) adoption in developed countries. However in developing countries, only limited research has been conducted on the viability of micro-generation PV as a main stream clean energy source for greening the electricity grid. This study provides an insight into how residential PV adoption operates in a small developing country. Using a zero-inflated negative binomial regression model (ZINBM), this study compares the influencing factors of PV adoption in the Colombo district of Sri Lanka, a lower-middle income country, against the well-established factors of PV adoption in developed countries. The results suggest that highly educated middle-aged persons and retirees in the Colombo district are more likely to adopt PV. In addition, early adopters reside in larger houses of average, or above average, housing quality. In the short term, policies focused on expanding the knowledge base on PV technology, as well as incentivising the initial costs of installation, could increase the adoption rate of PV systems in Sri Lanka. In the longer term, increasing opportunities for tertiary education could accelerate the diffusion of innovations, as well as narrow socioeconomic gaps by even distribution of benefits of technological innovations.