Faculty Publications

Now showing 1 - 4 of 4

Solar Radiation Assessment and Forecasting Using Satellite Data
(Springer Nature, 2019) Masoom, A.; Kashyap, Y.; Bansal, A.
Since the availability of ground data is very sparse, satellite data provides an alternative method to estimate solar irradiation. Satellite data across various spectral bands may be employed to distinguish weather signatures, such as dust, aerosols, fog, and clouds. For a tropical country like India, which is potentially rich in solar energy resources, the study of these parameters is of crucial importance from the perspective of solar energy. Furthermore, a complete utilization of the solar energy depends on its proper integration with power grids. Because of its variable nature, incorporation of photovoltaic energy into electricity grids suffers technical challenges. Solar radiation is subjected to reflection, scattering and absorption by air molecules, clouds, and aerosols in the atmosphere. Clouds can block most of the direct radiation. Modern solar energy forecasting systems rely on real-time Earth observation from the satellite for detecting clouds and aerosols. © 2019, Springer Nature Singapore Pte Ltd.
Effectiveness of SIP messages on SIP server
(2013) Bansal, A.; Kulkarni, P.; Pais, A.R.
Voice over Internet Protocol (Voice over IP, VoIP) is one of a family of communication protocols, and transmission technologies. It is used for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks. Session Initiation Protocol (SIP) is a signaling protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP). There are several DoS attacks by which we can disturb SIP server. In this paper, more importance has been given to DoS attack by flooding of different SIP-messages. A little work is done to analyze the performance of SIP server and quality of ongoing VoIP calls under DoS attacks. We show the utilization of CPU and memory during the multiple simultaneous calls. We have done our study using a customized analysis tool that has the ability to synthesize and launch flooding of different SIP messages. We define the performance metrics to measure the quality of VoIP calls under DoS attack. We have developed some programs and integrated them in a real SIP test bed environment to measure the performance of SIP server and quality of VoIP calls under DoS attack. Our measurements show that a standard SIP server can be easily overloaded by simple call requests. It also shows that simple call request can degrade quality of ongoing calls. Â© 2013 IEEE.
Mitigation of flooding based denial of service attack against session initiation protocol based VoIP system
(Institute of Electrical and Electronics Engineers Inc., 2015) Bansal, A.; Pais, A.R.
The Session Initiation Protocol (SIP) is the most popular signaling protocol used in Voice over Internet Protocol (VoIP). The flooding based DoS attack can be performed by sending only hundreds of SIP messages per second to a SIP server. In this paper, we have proposed a new mitigation scheme for SIP based VoIP system which can protect it from flooding based DoS attack. This scheme is based on the INVITE and BYE messages of the SIP protocol. A prototype system for the flooding based DoS attack on SIP server and a mitigation mechanism has been designed and implemented. The performance of the proposed system has been evaluated and found to be better than other existing mechanisms. Â© 2015 IEEE.
Rooftop photovoltaic energy production management in india using earth-observation data and modeling techniques
(MDPI AG rasetti@mdpi.com Postfach Basel CH-4005, 2020) Masoom, A.; Kosmopoulos, P.; Kashyap, Y.; Kumar, S.; Bansal, A.
This study estimates the photovoltaic (PV) energy production from the rooftop solar plant of the National Institute of Technology Karnataka (NITK) and the impact of clouds and aerosols on the PV energy production based on earth observation (EO)-related techniques and solar resource modeling. The post-processed satellite remote sensing observations from the INSAT-3D have been used in combination with Copernicus Atmosphere Monitoring Service (CAMS) 1-day forecasts to perform the Indian Solar Irradiance Operational System (INSIOS) simulations. NITK experiences cloudy conditions for a major part of the year that attenuates the solar irradiance available for PV energy production and the aerosols cause performance issues in the PV installations and maintenance. The proposed methodology employs cloud optical thickness (COT) and aerosol optical depth (AOD) to perform the INSIOS simulations and quantify the impact of clouds and aerosols on solar energy potential, quarter-hourly monitoring, forecasting energy production and financial analysis. The irradiance forecast accuracy was evaluated for 15 min, monthly, and seasonal time horizons, and the correlation was found to be 0.82 with most of the percentage difference within 25% for clear-sky conditions. For cloudy conditions, 27% of cases were found to be within ±50% difference of the percentage difference between the INSIOS and silicon irradiance sensor (SIS) irradiance and it was 60% for clear-sky conditions. The proposed methodology is operationally ready and is able to support the rooftop PV energy production management by providing solar irradiance simulations and realistic energy production estimations. © 2020 by the authors.

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