109 research outputs found
Read counts at multiple attenuation levels as an object localization technique using passive RFID tags
No full textRadio Frequency Technologies (RFID) are experiencing rapid development and business, retail, manufacturing and healthcare are the major application areas benefiting from it. We describe and analyze an algorithm which helps in tracking of medical equipment and personnel and patients in a Trauma Bay. We adapt the Read Count algorithm to be used at multiple attenuation levels as a localization technique. The input parameter to the algorithm is the read count value which gives a measure of number of times the back-scattered radio frequencies from passive tags has been received by the antenna. Special attention has to be given to the placement of antennas to get the optimum result. The detection of multiple tags and human occlusion are two major concerns which we have tried to solve by suing multiple horizontal antennas along with 1 vertical antenna. We have discussed the results and analysis of such a configuration and accordingly given a conclusion. The problems associated with the configuration have also been discussed which can form part of future work.M.S.Includes bibliographical referencesby Ankit Sard
Book review: Age of entanglement: German and Indian intellectuals across Empire by Kris Manjapara
No full text"Age of Entanglement: German and Indian Intellectuals across Empire." Kris Manjapara. Harvard University Press. January 2014. --- In this book, Kris Manjapara sets out to explore patterns of connection linking German and Indian intellectuals from the nineteenth century to the years after the Second World War. The author attempts to trace the intersecting ideas and careers of a diverse collection of individuals from South Asia and Central Europe who shared ideas, formed networks, and studied one another’s worlds. Ankit Kumar recommends this book to those studying world history, geopolitics, postcolonialism and development
RETRACTED ARTICLE: Psychological predictors behind the intention to drink and drive among female drivers: Application of extended theory of planned behavior
No full textWe, the Editor and Publisher of Traffic Injury Prevention, have retracted the following article: Ankit Kumar Yadav. Psychological predictors behind the intention to drink and drive among female drivers: Application of extended theory of planned behavior. Traffic Injury Prevention. 2020. https://doi.org/10.1080/15389588.2019.1703961. The author has requested the retraction of his article due to an error in one of the collected psychological measures. During data extraction, the responses for ‘attitude’ and ‘intention’ measures were switched and may have influenced the findings from the developed regression model and its results. As a result, the Editor and Publisher have agreed to retract the article in full. We have investigated and have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.</p
Pianotap: improving tap authentication on mobile devices
No full textIn this thesis, we study authentication on mobile devices by performing simple taps on the touchscreen. First, we have replicated a previously proposed system Pass- Chords - a tap based authentication system. Based on the lessons learned, we present an improved system called Pianotaps, which theoretically provides an orders of mag- nitude larger password space. We conducted a preliminary informal user study of PassChords, Pianotaps and PINs towards understanding the bene ts and drawbacks of these approaches. Our results indicate that Pianotaps provides enhanced security over shoulder sur ng attacks while also being faster to authenticate with.M.S.Includes bibliographical referencesby Ankit Sha
Effect of Twin Island Configuration on Airwake Aerodynamics over Generic Aircraft Carrier using CFD
No full textThe technological advancements have led to the evolution of numerous concepts in an aircraft carrier’s topdeck design, the twin island concept being the latest entrant. An aircraft carrier’s bluff body geometry presents many challenges to the pilot, landing on deck being the most critical. The present study aims to undertake a computational investigation of the aerodynamic analysis of a Twin Island GAC (Generic Aircraft Carrier) conceptualized vis- à-vis its base variant. The flow over the twin island GAC flight deck and downstream is analysed using various transverse planes perpendicular to the flow direction as detailed in the paper. Subsequently, a parametric study was undertaken for understanding the effects of longitudinal translations of the two islands with respect to the baseline GAC position. The results depict the advantage of certain variants of twin islands over a single island, and ~68 % reduction in turbulence is achieved along the glideslope by one of the variations which could aid in reducing pilot workload. The data can act as a catalyst for utilization and incorporation in future floating platform designs and further studies in this field
Homogenization and elastic-plastic transitions in random and FGM microstructures
No full textThe research presented here uses homogenization as a tool to estimate the effective properties of heterogeneous materials with varying microstructures. Separation of scales (Micro (d), Meso(δ), Macro (L)), in these microstructures leads to the problem of determination of the Representative Volume Element (RVE) that corresponds to the effective properties of materials. Microstructural randomness is inherent in these materials and hence we study the scaling from Statistical Volume Element (SVE) to RVE. Using Hill condition, the RVE is achieved when the material response becomes independent of the two boundary conditions (kinematic and static boundary condition) setup on the SVE. Elastic responses of 2d microstructures such as two-phase random checkerboard are considered, and RVE of the same is also identified. This technique is consistent with the Hill-Mandel macrohomogenity condition. We propose to homogenize the elastic response of FGM (functionally graded materials) type microstructure in 3d using the same technique. Since the Hill condition is independent of the microstructure, hence it is counter-intuitive that FGM microstructure can- not be easily homogenized using the same approach. The inelastic response of FGM microstructures in 2d and 3d are also studied here. The elastic-plastic transition in multiphase materials is smooth (not sudden), suggesting fractal nature of the evolving plasticity in the material. An attempt is made to calculate the fractal dimension of these evolving plastic grains in the 2d and 3d FGM microstructure. In 3d, this results in massive simulations performed in parallel using commercially available FEM package called ABAQUS. The simulations were carried out using the computational resources available at the National Center for Supercomputing Applications (NCSA). This opens up the possibility of assessing plastic damage in material through fractals. Preliminary experimental study using viscoelastic materials for FGM microstructure is also presented here. Furthermore, we also present the scaling effect under finite mesoscale size quantified in the form of normalized scaling function. We propose to study the effect of this scaling function for the two-phase correlated microstructures of Gaussian type, formulation of which is also presented here. Comparison with existing experimental data shows our numerical model is well in agreement with the experimental data for various volume fractions of the constituent phases.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01The student, Ankit Saharan, accepted the attached license on 2015-04-22 at 10:05.The student, Ankit Saharan, submitted this Dissertation for approval on 2015-04-22 at 10:16.This Dissertation was approved for publication on 2015-04-23 at 07:34.DSpace SAF Submission Ingestion Package generated from Vireo submission #8012 on 2015-07-22 at 14:26:06Made available in DSpace on 2015-07-22T22:45:57Z (GMT). No. of bitstreams: 4
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Previous issue date: 2015-04-23Embargo set by: Seth Robbins for item 80013
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Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 80013 on 2017-07-23T09:15:24Z
Constructing an inclusive vision of sustainable transition to decentralised energy: Local practices, knowledge, values and narratives in the case of community-managed grids in rural India
No full textThis chapter claims that the global North’s vision of sustainable energy transition (SET), which informs policies and infrastructure developments, holds a partial account of diverse energy-related practices and associated values that are endemic to local communities. Referring to the EU directive, this chapter points towards the implicit bias about the role of advanced technologies in SET. The vision of SET expressed in the EU directive has the interlocked relation with market designs, economic growth and underlying rational values that might result in a mismatch with needs, values and practices of local communities. This chapter presents empirical observations from an ethnographic field-research on community-managed solar mini-grids in rural India to hint at alternative possibilities and contribute to a more inclusive vision of SET. In particular, it demonstrates that practices of improvisation, redistribution of energy and adaptation of mini-grid informed by the villagers’ social, cultural and economic needs are entangled with local knowledge and values. By learning from the local practices, knowledge, values and narratives with energy technologies, this chapter proposes to take a step towards a “big picture” of the sustainable transition to decentralised energy.Ethics & Philosophy of TechnologyDesign Conceptualization and Communicatio
Cosmological N-body simulations: a challenge for scalable generative models: Tensorflow checkpoints
No full text<p><strong>Tensorflow checkpoints: Cosmological N-body simulations: a challenge for scalable generative models</strong></p>
<p>This corresponds to the Tensorflow checkpoints for the experiments in the paper <strong>Cosmological N-body simulations: a challenge for scalable generative models</strong> by Nathanaël Perraudin, Ankit Srivastava, Aurelien Lucchi, Tomasz Kacprzak, Thomas Hofmann, Alexandre Refregier, Adam Amara.</p>
<pre><code>@inproceedings{perraudin2019cosmological,
title = {Cosmological N-body simulations: a challenge for scalable generative models},
author = {Nathana\"el, Perraudin and Ankit, Srivastava and Kacprzak, Tomasz and Lucchi, Aurelien and Hofmann, Thomas and R{\'e}fr{\'e}gier, Alexandre},
year = {2019},
archivePrefix = {arXiv},
eprint = {1908.05519},
url = {https://arxiv.org/abs/1908.05519},
}
</code></pre>
<p>Please check the assotiated github page <a href="https://github.com/nperraud/3DcosmoGAN">https://github.com/nperraud/3DcosmoGAN</a> for additional information.</p>
<p>This corresponds to the Tensorflow checkpoints for the experiments in the paper<br>
**Cosmological N-body simulations: a challenge for scalable generative models** by<br>
Nathanaël Perraudin, Ankit Srivastava, Aurelien Lucchi, Tomasz Kacprzak, Thomas Hofmann, Alexandre Refregier, Adam Amara.</p>
<p>Please check the assotiated github page <a href="https://github.com/nperraud/3DcosmoGAN">https://github.com/nperraud/3DcosmoGAN</a> for additional information.</p>
Heat transfer in Sisko fluid past an unsteady stretching surface with heat source/sink and viscous dissipation effects
No full text- …
