157 research outputs found
Broadband mm-wave signal generation and amplification in CMOS using synthetic impedance
No full textThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 75-76).This thesis explores the concept of synthesizing tunable impedances by establishing the appropriate phase relationship between the drain voltage and drain current of a MOS transistor. A high frequency, wide tuning range 105-121GHz oscillator and a small-footprint 20-40GHz oscillator using synthetic resonance are presented. The concept of impedance synthesis is also used to generate a novel frequency-adaptive loss compensation scheme for distributed amplifiers which is shown to improve the bandwidth by 30%. The performance of these circuits was analyzed and simulated on a TSMC 65nm bulk CMOS process.by Pranav R Kaundinya.M. Eng
Predicting-wildlife-reservoirs-of-Flaviviruses
No full text<p>The first release of the codes for manuscript</p>
<p>Predicting wildlife reservoirs and global vulnerability to zoonotic Flaviviruses P. Pandit, M. Doyle, K. Smart, C. Young, G. Drape, C.K. Johnson</p>
Homogeneous catalyst mediated glucose mutarotation studies using vibrational spectroscopy
No full textThe pitfalls of overdependence on fossil fuels are well documented. Current research aims to focus on biomass obtained from renewable cellulose for the production of fuels and chemicals. In that regard, with cellulose as source, 5-hydroxymethylfurfural (HMF) is a versatile platform chemical for the production of chemicals like levulinic acid. The isomerization of glucose to fructose is one of the steps in the synthesis of HMF from cellulose. Glucose exists in several anomeric forms and it has been shown that the isomerization reaction is anomer specific. This work focuses on the study of mutarotation in glucose in the presence of homogeneous Lewis acid catalysts. A combination of spectroscopic tools: ATR-IR and Raman spectroscopy are used to study the vibrational modes of glucose in aqueous solution. At room temperature, changes in vibrational modes can be attributed to the mutarotation reaction. This work compares the rate of mutarotation in different concentrations of AlCl3, CrCl3 and SnCl4. The influence of metal salts in solution, pH and ionic strength were also probed by comparing with the rates obtained in Brönsted acids. The mutarotation in Lewis acid is faster than that in water. It is fastest in SnCl4 and increases with increase in concentration of SnCl4. Results also indicate a lack of glucose-Lewis acid interactions. However, rates vary depending on the nature of metal salts in solution indicating that the mutarotation is influenced by the nature of Lewis acid-water interactions.M.S.Includes bibliographical referencesby Pranav Rames
Do share pledges by insiders influence firm performance and value?
No full textThe first chapter demonstrates the prevalence and importance of pledging of shares by insiders in the U.S. I create the first comprehensive database of share pledges by insiders in the U.S. to reveal the prevalence of this practice and its role in encouraging earnings management. I find that, during the fiscal years 2006 to 2014, insiders at one of every three S&P1500 firms pledged their ownership in the firm as collateral to obtain loans at least once. I exploit a 2012 market-wide advisory against share pledges by Institutional Shareholder Services, the largest proxy advisory firm, as a quasi-natural experiment. A difference-in-differences estimation reveals that, after the shock, insiders curtailed share pledge activity by approximately 40% and firms with share pledges reduced earnings manipulation by an average 15% of their reported profits. The results suggest that share pledges distort the incentives of insiders and motivate them to inflate earnings.
The second chapter segregates the two types of share pledges and shows that they have divergent effects on firm performance and value. Insiders pledge their ownership in the firm to offer collateral for not only their personal loans but also the loans to the firm. Pledging of shares modifies their payoff structure without altering their control rights. This modification in the payoff structure can influence the incentives of controlling shareholders and have real effects on the firm's value and performance. Using hand-collected data from India,I find that share pledges for personal loans reduce the effective ownership of controlling shareholders and destroy firm value. In contrast, share pledges for firm's loans mitigate borrowing constraints for the firm and add value to firms with limited access to debt finance or high growth opportunities.
The third and last chapter documents that share pledges by insiders create moral hazards by motivating them to alter the risk-taking ability of firms and encouraging them to avoid reporting small losses. During the years 2009 to 2015, firms in India displayed a higher tendency to avoid reporting small losses by converting them to small profits when their controlling shareholders pledged shares. Share pledges for personal loans and firm's loans have contrasting effects on the aggregate risk-taking ability of firms. Share pledges for personal loans predict a decline in the risk-taking ability of firms over the subsequent year. On the contrary, share pledges for firm's loans may lead to excessive risk-taking.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01The student, Pranav Singh, accepted the attached license on 2019-04-07 at 18:54.The student, Pranav Singh, submitted this Dissertation for approval on 2019-04-07 at 19:05.This Dissertation was approved for publication on 2019-04-12 at 07:42.DSpace SAF Submission Ingestion Package generated from Vireo submission #13508 on 2019-08-22 at 16:20:51Made available in DSpace on 2019-08-23T20:44:39Z (GMT). No. of bitstreams: 2
SINGH-DISSERTATION-2019.pdf: 1321352 bytes, checksum: 1b00d9f433e722c1273016276b719f37 (MD5)
LICENSE.txt: 4209 bytes, checksum: 5f96c7408b374276fbaebbc846b3b679 (MD5)
Previous issue date: 2019-04-12Embargo set by: Seth Robbins for item 112285
Lift date: 2021-08-23T20:44:50Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 112285
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Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 112285
Lift date: 2021-08-23T20:47:38Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 112285
Lift date: 2021-08-23T20:48:32Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 112285 on 2021-08-24T09:15:31Z
PanditPranav/PREDICT_network_analysis: PREDICT_network_analysis
No full textCode and data for manuscript:
Predicting the potential for zoonotic transmission and host associations for novel viruse
PanditPranav/MultiDrugResistance_DairyCattle: First release for submission of the manuscript
No full textHerd management practices associated with multi-drug resistance in fecal bacterial commensals and Salmonella shed by cull dairy cows, a machine learning approac
Moduli problems in derived noncommutative geometry
No full textWe study moduli spaces of boundary conditions in 2D topological field theories. To a compactly generated linear ∞-category [special characters omitted], we associate a moduli functor [special characters omitted] parametrizing compact objects in [special characters omitted]. The Barr-Beck-Lurie monadicity theorem allows us to establish the descent properties of [special characters omitted], and show that [special characters omitted] is a derived stack. The Artin-Lurie representability criterion makes manifest the relation between finiteness conditions on [special characters omitted], and the geometricity of [special characters omitted]. If [special characters omitted] is fully dualizable (smooth and proper), then [special characters omitted] is geometric, recovering a result of Toën-Vaquie from a new perspective. Properness of [special characters omitted] does not imply geometricity in general: perfect complexes with support is a counterexample. However, if [special characters omitted] is proper and perfect (symmetric monoidal, with compact = dualizable ), then [special characters omitted] is geometric. The final chapter studies the moduli of Noncommutative Calabi-Yau Spaces (oriented 2D-topological field theories). The Cobordism Hypothesis and Deligne\u27s Conjecture are used to outline an approach to proving the unobstructedness of this space, and constructing a Frobenius structure on it
Data for Contrasting action and posture coding with hierarchical deep neural network models of proprioception
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Contrasting action and posture coding with hierarchical deep neural network models of proprioception, eLife 2023
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Authors: Kai J Sandbrink, Pranav Mamidanna, Claudio Michaelis, Matthias Bethge, Mackenzie W Mathis and Alexander Mathis
Affiliation: Brain Mind Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Switzerland, The Rowland Institute at Harvard, Harvard University, United States; Tübingen AI Center, Eberhard Karls Universität Tübingen & Institute for Theoretical Physics, Germany
Date of upload: December, 2024
Earlier the data was available via dropbox (see github).
Link to the eLife article:
https://elifesciences.org/articles/81499
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Here we provide the data and code for this project:
We share the proprioceptive character recognition dataset (contained in 'pcr_data.zip') it has approximately ~29GB when uncompressed.
We share the weights of all the trained networks (contained in 'network-weights.zip'): about ~3.5GB
The compressed code is also available here ('DeepDrawCode.zip').
The activations are shared in a separate Zenodo project (due to the size). Check out the repository below to find the link.
The up to date code is at: https://github.com/amathislab/DeepDraw
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The datasets, weights, activations and predictions are released with Creative Commons Attribution 4.0 license.
If you find this useful, please cite:
@article{sandbrink2023contrasting, title={Contrasting action and posture coding with hierarchical deep neural network models of proprioception}, author={Sandbrink, Kai J and Mamidanna, Pranav and Michaelis, Claudio and Bethge, Matthias and Mathis, Mackenzie Weygandt and Mathis, Alexander}, journal={Elife}, volume={12}, pages={e81499}, year={2023}, publisher={eLife Sciences Publications Limited}}UPAMATHISUPMWMATHI
Constructing Buildings and Harmonic Maps
No full textIn a continuation of our previous work, we outline a theory which should lead to the construction of a universal pre-building and versal building with a -harmonic map from a Riemann surface, in the case of two-dimensional buildings for the group . This will provide a generalization of the space of leaves of the foliation defined by a quadratic differential in the classical theory for . Our conjectural construction would determine the exponents for WKB problems, and it can be put into practice on examples
Retrospective study on admission trends of Californian hummingbirds found in urban habitats (1991–2016)
No full text- …
