Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Nilavra Pathak is active.

Publication


Featured researches published by Nilavra Pathak.


Pervasive and Mobile Computing | 2016

Fine-grained appliance usage and energy monitoring through mobile and power-line sensing

Nirmalya Roy; Nilavra Pathak; Archan Misra

To promote energy-efficient operations in residential and office buildings, non-intrusive load monitoring (NILM) techniques have been proposed to infer the fine-grained power consumption and usage patterns of appliances from power-line measurement data. Fine-grained monitoring of everyday appliances (such as toasters and coffee makers) can not only promote energy-efficient building operations, but also provide unique insights into the context and activities of individuals. Current building-level NILM techniques are unable to identify the consumption characteristics of relatively low-load appliances, whereas smart-plug based solutions incur significant deployment and maintenance costs. In this paper, we investigate an intermediate architecture, where smart circuit breakers provide measurements of aggregate power consumption at room (or section) level granularity. We then investigate techniques to identify the usage and energy consumption of individual appliances from such measurements. We first develop a novel correlation-based approach called CBPA to identify individual appliances based on both their unique transient and steady-state power signatures. While promising, CBPA fails when the set of candidate appliances is too large. To further improve the accuracy of appliance level usage estimation, we then propose a hybrid system called AARPA, which uses mobile sensing to first infer high-level activities of daily living (ADLs), and then uses knowledge of such ADLs to effectively reduce the set of candidate appliances that potentially contribute to the aggregate readings at any point. We evaluate two variants of this algorithm, and show, using real-life data traces gathered from 10 domestic users, that our fusion of mobile and power-line sensing is very promising: it identified all devices that were used in each data trace, and it identified the usage duration and energy consumption of low-load consumer appliances with ~ 87% accuracy.


international conference on pervasive computing | 2015

Demo abstract: A microphone sensor based system for green building applications

Abdullah Al Hafiz Khan; Sheung Lu; Nirmalya Roy; Nilavra Pathak

Acoustic sensing has influenced many applications in green building energy management, such as designing multi-modal energy disaggregation algorithms through fine-grained appliance state identifications or efficiently controlling the HVAC system based on the occupancy of the environment. In this demo paper we build a low-cost system prototype using off-the-shelf commercially available hardware (Raspberry Pi and super high gain microphone) to handle both acoustic sensing and its processing that is portable and easily deployable in any indoor environment. Our system is useful in detecting appliance noise for fine-grained energy metering and human voice for managing building energy footprint. We use the decibel strength of the sound to determine if it should be filtered out as a silence or stored in as an audio of interest. A fast fourier transform that quickly converts the sinusoidal input of the audio signals into its associated frequencies is implemented along with the Mel-Frequency Cepstral Coefficients (MFCCs) feature to distinguish between a human voice and an appliance noise. We also implement all the computations on-chip to quantify the energy-delay benefits.


mobile data management | 2015

AARPA: Combining Mobile and Power-Line Sensing for Fine-Grained Appliance Usage and Energy Monitoring

Nirmalya Roy; Nilavra Pathak; Archan Misra

To promote energy-efficient operations in residential and office buildings, non-intrusive load monitoring (NILM) techniques have been proposed to infer the fine-grained power consumption and usage patterns of appliances from power-line measurement data. Fine-grained monitoring of everyday appliances (such as toasters and coffee makers) can not only promote energy-efficient building operations, but also provide unique insights into the context and activities of individuals. Current building-level NILM techniques are unable to identify the consumption characteristics of relatively low-load appliances, whereas smart-plug based solutions incur significant deployment and maintenance costs. In this paper, we investigate an intermediate architecture, where smart circuit breakers provide measurements of aggregate power consumption at room (or section) level granularity. We then investigate techniques to identify the usage and energy consumption of individual appliances from such measurements. We first develop a novel correlation-based approach called CBPA to identify individual appliances based on both their unique transient and steady-state power signatures. While promising, CBPA fails when the set of candidate appliances is too large. To further improve the accuracy of appliance level usage estimation, we then propose a hybrid system called AARPA, which uses mobile sensing to first infer high-level activities of daily living (ADLs), and then uses knowledge of such ADLs to effectively reduce the set of candidate appliances that potentially contribute to the aggregate readings at any point. We evaluate two variants of this algorithm, and show, using real-life data traces gathered from 10 domestic users, that our fusion of mobile and power-line sensing is very promising: it identified all devices that were used in each data trace, and it identified the usage duration and energy consumption of low-load consumer appliances with 87% accuracy.


international conference on systems for energy efficient built environments | 2017

Longitudinal energy waste detection with visualization

David Lachut; Nilavra Pathak; Nilanjan Banerjee; Nirmalya Roy; Ryan Robucci

Leaky windows and doors, open refrigerators, unattended appliances, left-on lights, and other sources subtly leak energy accounting for a large portion of waste. Formal energy audits are expensive and time consuming and do not capture many sources of leakage and waste. In this short paper, we present a hybrid IR/RGB imaging system for an end-user to deploy to perform longitudinal detection of energy waste. The system uses a low resolution, 16 x 4 IR camera and a low cost digital camera mounted on a steerable platform to automatically scan a room, periodically taking low resolution IR and RGB images. The system uses image stitching to create an IR/RGB hybrid panoramic image and segmentation to determine temperature extrema in the scanned room. Finally, this data is combined with thermostat set-point information to highlight hot-spots or cold-spots which likely indicate energy leakage or wastage. The system obviates the need for expensive, time-consuming waste detection methods, for professional setup, and for more intrusive instrumentation of the home.


ieee international conference on pervasive computing and communications | 2015

Acoustic based appliance state identifications for fine-grained energy analytics

Nilavra Pathak; Abdullah Al Hafiz Khan; Nirmalya Roy


international green and sustainable computing conference | 2015

Iterative signal separation assisted energy disaggregation

Nilavra Pathak; Nirmalya Roy; Animikh Biswas


international conference of distributed computing and networking | 2018

Non-Intrusive Air Leakage Detection in Residential Homes

Nilavra Pathak; David Lachut; Nirmalya Roy; Nilanjan Banerjee; Ryan Robucci


ieee international conference on smart computing | 2018

Forecasting Gas Usage for Big Buildings Using Generalized Additive Models and Deep Learning

Nilavra Pathak; Amadou Ba; Joern Ploennigs; Nirmalya Roy


ieee international conference on smart computing | 2018

PhD Forum: Scalable Energy Disaggregation: Data, Dimension and Beyond

Nilavra Pathak


EAI Endorsed Transactions on Ubiquitous Environments | 2015

Mobeacon: An iBeacon-Assisted Smartphone-Based Real Time Activity Recognition Framework

Mohammad Arif Ul Alam; Nilavra Pathak; Nirmalya Roy

Collaboration


Dive into the Nilavra Pathak's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Archan Misra

Singapore Management University

View shared research outputs
Top Co-Authors

Avatar

Animikh Biswas

University of North Carolina at Charlotte

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Sheung Lu

University of Maryland

View shared research outputs
Researchain Logo
Decentralizing Knowledge