Footfall based biometric system is perhaps the only person identification technique which does no... more Footfall based biometric system is perhaps the only person identification technique which does not hinder the natural movement of an individual. This is a clear edge over all other biometric systems which require a formidable amount of human intervention and encroach upon an individual's privacy to some extent or the other. This paper presents a Fog computing architecture for implementing footfall based biometric system using widespread geographically distributed geophones (vibration sensor). Results were stored in an Internet of Things (IoT) cloud. We have tested our biometric system on an indigenous database (created by us) containing 46000 footfall events from 8 individuals and achieved an accuracy of 73%, 90% and 95% in case of 1, 5 and 10 footsteps per sample. We also proposed a basis pursuit based data compression technique DS8BP for wireless transmission of footfall events to the Fog. DS8BP compresses the original footfall events (sampled at 8 kHz) by a factor of 108 and also acts as a smoothing filter. These experimental results depict the high viability of our technique in the realm of person identification and access control systems.
International Conference on Graphic and Image Processing (ICGIP 2012), 2013
ABSTRACT Atmospheric turbulence can cause significant performance degradation in free space optic... more ABSTRACT Atmospheric turbulence can cause significant performance degradation in free space optical (FSO) communication system. Major effects on the beam such as beam wander and beam scintillation degrades the performance at the receiver. We investigate the impact of diversity technique and aperture averaging technique on the performance of FSO system. Performance evaluation is made in terms of average bit error rate and scintillation index.
Abstract: Spatial diversity technique is one of the mitigation techniques to combat the effect of... more Abstract: Spatial diversity technique is one of the mitigation techniques to combat the effect of atmospheric turbulence. In this paper, a spatial diversity technique with equal gain combining (EGC) is employed to analyze the performance of ground to deep space optical link ...
2011 Third International Conference on Advanced Computing, 2011
ABSTRACT Ubiquitous sensing applications often involve the sensor based data collection with a la... more ABSTRACT Ubiquitous sensing applications often involve the sensor based data collection with a large coverage in space in and time. From a return on investment perspective the value of information needs to be attractive with the cost of infrastructure to acquire it. The role of participative sensing and human centric sensing has been widely explored for collecting and analyzing data for use in social science, environmental and health applications. The wide availability of smart phones integrated with variety of sensors is becoming platform for people to document a neighborhood, gather evidence, study behaviors and is accelerating the pace of exploration in new application areas. Many of the current applications involve the monitoring of public spaces involving the participation of citizen in general. Participative surveillance is an application that can bring substantial social benefit. There are many challenges in effectively deploying such applications. It includes the privacy issues, trustworthiness of the data, human factors that affect the quality of sensing, variability of devices, enrolling and motivating participants, and a sustainable business model. Further it should be supported with a sound framework for deployment where the participant has control over data, transparency in data handling and intuitive user interface supporting multi-modal interactions. This presentation will discuss the above aspects with a few illustrative use case scenarios.
2014 Fifth International Symposium on Electronic System Design, 2014
—We present Pratham, an embedded platform with programmable wireless communication range and Over... more —We present Pratham, an embedded platform with programmable wireless communication range and Over-The-Air programming capability. It is a new design for wireless node hardware aimed at creating a class of heterogeneous sensor networks which bridge the gap between ultra-low power short range and high power long range wireless sensor nodes, while maintaining ease of use and robustness of software. The wireless link created by Pratham nodes is characterised for throughput, quality and power profiles for elementary operations. The supported Over-The-Air programming process is modelled as a Colored Petri Net to analyse its performance. Typical network lifetimes are discussed and the effect of post-deployment remote programming on the life of the node is calculated.
Internet of Things (IoT) refers to the paradigm of having sensor-enabled devices represented on a... more Internet of Things (IoT) refers to the paradigm of having sensor-enabled devices represented on a global inter-connected web. A sensor network is a customized network of sensor nodes deployed for a specific objective. Due to the variety of application areas, objectives and end-user requirements of sensor networks can differ widely between deployments. IoT, on the other hand, envisions a homogeneous presentation of information from sensor nodes for mining and analysis. It promises support for machine-to-machine (M2M) communication between sensor nodes. To tackle such conflicting requirements, we present RAPIDSNAP-a scriptable application framework for rapid deployment of sensor networks-which acts as a smart middleware to adapt sensor networks for IoT. RAPIDSNAP provides script-based extensions to facilitate development of customized sensor network applications while providing bridge-interfaces for integrating them with IoT repositories such as Wisekar. We illustrate the impact of RAPIDSNAP and Wisekar by using them to propose extensions to a sensor network based health application-Gaitsense. We conclude by comparing RAPIDSNAP with other frameworks.
In this paper we study the impact of combined nonlinear effects (i.e. stimulated Raman scattering... more In this paper we study the impact of combined nonlinear effects (i.e. stimulated Raman scattering (SRS) and four wave mixing (FWM)) and their interplay with amplified spontaneous emission (ASE) noise on the performance of all optical WDM network in terms of Quality factor (Q-factor) for various system parameters based on ITU-T Recommendation G.692 for applications on G.653 fibers. The worst affected channels due to SRS has been considered for performance evaluation. The accuracy of the proposed model is confirmed by the match found between the results obtained theoretically and those using OptSim TM software. In both the cases it is observed that performance of the network is severely limited by the combined nonlinear effects and ASE noise generated by the amplifier.
Footfall based biometric system is perhaps the only person identification technique which does no... more Footfall based biometric system is perhaps the only person identification technique which does not hinder the natural movement of an individual. This is a clear edge over all other biometric systems which require a formidable amount of human intervention and encroach upon an individual's privacy to some extent or the other. This paper presents a Fog computing architecture for implementing footfall based biometric system using widespread geographically distributed geophones (vibration sensor). Results were stored in an Internet of Things (IoT) cloud. We have tested our biometric system on an indigenous database (created by us) containing 46000 footfall events from 8 individuals and achieved an accuracy of 73%, 90% and 95% in case of 1, 5 and 10 footsteps per sample. We also proposed a basis pursuit based data compression technique DS8BP for wireless transmission of footfall events to the Fog. DS8BP compresses the original footfall events (sampled at 8 kHz) by a factor of 108 and also acts as a smoothing filter. These experimental results depict the high viability of our technique in the realm of person identification and access control systems.
International Conference on Graphic and Image Processing (ICGIP 2012), 2013
ABSTRACT Atmospheric turbulence can cause significant performance degradation in free space optic... more ABSTRACT Atmospheric turbulence can cause significant performance degradation in free space optical (FSO) communication system. Major effects on the beam such as beam wander and beam scintillation degrades the performance at the receiver. We investigate the impact of diversity technique and aperture averaging technique on the performance of FSO system. Performance evaluation is made in terms of average bit error rate and scintillation index.
Abstract: Spatial diversity technique is one of the mitigation techniques to combat the effect of... more Abstract: Spatial diversity technique is one of the mitigation techniques to combat the effect of atmospheric turbulence. In this paper, a spatial diversity technique with equal gain combining (EGC) is employed to analyze the performance of ground to deep space optical link ...
2011 Third International Conference on Advanced Computing, 2011
ABSTRACT Ubiquitous sensing applications often involve the sensor based data collection with a la... more ABSTRACT Ubiquitous sensing applications often involve the sensor based data collection with a large coverage in space in and time. From a return on investment perspective the value of information needs to be attractive with the cost of infrastructure to acquire it. The role of participative sensing and human centric sensing has been widely explored for collecting and analyzing data for use in social science, environmental and health applications. The wide availability of smart phones integrated with variety of sensors is becoming platform for people to document a neighborhood, gather evidence, study behaviors and is accelerating the pace of exploration in new application areas. Many of the current applications involve the monitoring of public spaces involving the participation of citizen in general. Participative surveillance is an application that can bring substantial social benefit. There are many challenges in effectively deploying such applications. It includes the privacy issues, trustworthiness of the data, human factors that affect the quality of sensing, variability of devices, enrolling and motivating participants, and a sustainable business model. Further it should be supported with a sound framework for deployment where the participant has control over data, transparency in data handling and intuitive user interface supporting multi-modal interactions. This presentation will discuss the above aspects with a few illustrative use case scenarios.
2014 Fifth International Symposium on Electronic System Design, 2014
—We present Pratham, an embedded platform with programmable wireless communication range and Over... more —We present Pratham, an embedded platform with programmable wireless communication range and Over-The-Air programming capability. It is a new design for wireless node hardware aimed at creating a class of heterogeneous sensor networks which bridge the gap between ultra-low power short range and high power long range wireless sensor nodes, while maintaining ease of use and robustness of software. The wireless link created by Pratham nodes is characterised for throughput, quality and power profiles for elementary operations. The supported Over-The-Air programming process is modelled as a Colored Petri Net to analyse its performance. Typical network lifetimes are discussed and the effect of post-deployment remote programming on the life of the node is calculated.
Internet of Things (IoT) refers to the paradigm of having sensor-enabled devices represented on a... more Internet of Things (IoT) refers to the paradigm of having sensor-enabled devices represented on a global inter-connected web. A sensor network is a customized network of sensor nodes deployed for a specific objective. Due to the variety of application areas, objectives and end-user requirements of sensor networks can differ widely between deployments. IoT, on the other hand, envisions a homogeneous presentation of information from sensor nodes for mining and analysis. It promises support for machine-to-machine (M2M) communication between sensor nodes. To tackle such conflicting requirements, we present RAPIDSNAP-a scriptable application framework for rapid deployment of sensor networks-which acts as a smart middleware to adapt sensor networks for IoT. RAPIDSNAP provides script-based extensions to facilitate development of customized sensor network applications while providing bridge-interfaces for integrating them with IoT repositories such as Wisekar. We illustrate the impact of RAPIDSNAP and Wisekar by using them to propose extensions to a sensor network based health application-Gaitsense. We conclude by comparing RAPIDSNAP with other frameworks.
In this paper we study the impact of combined nonlinear effects (i.e. stimulated Raman scattering... more In this paper we study the impact of combined nonlinear effects (i.e. stimulated Raman scattering (SRS) and four wave mixing (FWM)) and their interplay with amplified spontaneous emission (ASE) noise on the performance of all optical WDM network in terms of Quality factor (Q-factor) for various system parameters based on ITU-T Recommendation G.692 for applications on G.653 fibers. The worst affected channels due to SRS has been considered for performance evaluation. The accuracy of the proposed model is confirmed by the match found between the results obtained theoretically and those using OptSim TM software. In both the cases it is observed that performance of the network is severely limited by the combined nonlinear effects and ASE noise generated by the amplifier.
Seminar on Next Generation Networks – Implementations and Implications, Telecom Regulatory Author... more Seminar on Next Generation Networks – Implementations and Implications, Telecom Regulatory Authority of India, New Delhi, 25- 26 Aug 2011
Seminar on Regulatory Framework for Emerging Telecom Environment, Telecom Regulatory Authority of... more Seminar on Regulatory Framework for Emerging Telecom Environment, Telecom Regulatory Authority of India (TRAI), New Delhi, 6- 8 Sep 2011
Students who are already in engineering institutes often have questions like "What next after BTe... more Students who are already in engineering institutes often have questions like "What next after BTech/MTech ?" “Is a PhD needed for engineers ?” "Should I go abroad or stay in India ?" "Are Internships necessary ?" "Which engineering jobs should I choose ?" "Management or Engineering ?" "Is coaching a must for GATE?"
What does a Class 12 student typically feel about Engineering ?
What are the factors that drive ... more What does a Class 12 student typically feel about Engineering ?
What are the factors that drive a student towards engineering careers ?
How does one choose / which engineering is good for one ?
What should influence your choice ? Jobs, career, interest ?
How to excel in engineering / having fun while doing it ?
Options for a engineering undergraduate ?
Fourth International Training College on Optical Fibers and Lasers, International Centre for Theo... more Fourth International Training College on Optical Fibers and Lasers, International Centre for Theoretical Physics, Trieste, Italy, Jan 1993
Uploads
Papers by Subrat Kar
2011
What are the factors that drive a student towards engineering careers ?
How does one choose / which engineering is good for one ?
What should influence your choice ? Jobs, career, interest ?
How to excel in engineering / having fun while doing it ?
Options for a engineering undergraduate ?