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arXiv 2023年

作者： Lin, Hsiu-Hsien Scholz, Paul Ng, Cherry Pen, Ue-Li Bhardwaj, Mohit Chawla, Pragya Curtin, Alice P. Li, Dongzi Newburgh, Laura Reda, Alex Sand, Ketan R. Tendulkar, Shriharsh P. Andersen, Bridget Bandura, Kevin Brar, Charanjot Cassanelli, Tomas Cook, Amanda M. Dobbs, Matt Dong, Fengqiu Adam Eadie, Gwendolyn Fonseca, Emmanuel Gaensler, B.M. Giri, Utkarsh Herrera-Martin, Antonio Hill, Alex S. Kaczmarek, Jane Kania, Joseph Kaspi, Victoria Khairy, Kholoud Lanman, Adam E. Leung, Calvin Masui, Kiyoshi W. Mena-Parra, Juan Meyers, Bradley W. Michilli, Daniele Milutinovic, Nikola Ordog, Anna Pearlman, Aaron B. Pleunis, Ziggy Rafiei-Ravandi, Masoud Rahman, Mubdi Ransom, Scott Sanghavi, Pranav Shin, Kaitlyn Smith, Kendrick Stairs, Ingrid Stenning, David C. Vanderlinde, Keith Wulf, Dallas Institute of Astronomy and Astrophysics Academia Sinica Astronomy-Mathematics Building No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Canadian Institute for Theoretical Astrophysics 60 St. George Street TorontoONM5S 3H8 Canada Dunlap Institute for Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Department of Physics and Astronomy York University 4700 Keele Street TorontoONMJ3 1P3 Canada Laboratoire de Physique et Chimie de l'Environnement et de l'Espace Université d'Orléans CNRS Orléans45071 Cedex 02 France Canadian Institute for Advanced Research MaRS Centre 661 University Avenue TorontoONM5G 1M1 Canada Perimeter Institute for Theoretical Physics 31 Caroline Street N WaterlooONN25 2YL Canada Department of Physics Carnegie Mellon University 5000 Forbes Avenue PittsburghPA15213 United States Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Trottier Space Institute McGill University 3550 rue University MontréalQCH3A 2A7 Canada Department of Physics McGill University 3600 rue University MontréalQCH3A 2T8 Canada Cahill Center for Astronomy and Astrophysics California Institute of Technology 1216 E California Boulevard PasadenaCA91125 United States Department of Physics Yale University New HavenCT06520 United States Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Mumbai400005 India National Centre for Radio Astrophysics Post Bag 3 Ganeshkhind Pune411007 India Lane Department of Computer Science and Electrical Engineering 1220 Evansdale Drive PO Box 6109 MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States Department of Electrical Engineering Universidad de Chile Av. Tupper 2007 Santiago8370451 Chile David A. Dunlap Department of Astronomy & Astrophysics University of Toront

We report ten fast radio bursts (FRBs) detected in the far side-lobe region (i.e., ≥ 5° off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from 2018 August 28 to 2021 August 31. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far side-lobe events have on average ∼500 times greater fluxes than events detected in CHIME's main lobe. We show that the side-lobe sample is therefore statistically ∼20 times closer than the main-lobe sample. We find promising host galaxy candidates (Pcc Copyright © 2023, The Authors. All rights reserved.

关键词： Poisson distribution

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Corrigendum to "Design and implementation of a low-cost, tabletop MRI scanner for education and research prototyping" [J. Magn. Reson. 310 (2020) 106625]

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Journal of magnetic resonance (San Diego, Calif. : 1997) 2020年 317卷 106764页

作者： Clarissa Zimmerman Cooley Jason P Stockmann Thomas Witzel Cris LaPierre Azma Mareyam Feng Jia Maxim Zaitsev Wenhui Yang Wang Zheng Pascal Stang Greig Scott Elfar Adalsteinsson Jacob K White Lawrence L Wald A. A. Martinos Center for Biomedical Imaging Department of Radiology Massachusetts General Hospital Charlestown MA USA Harvard Medical School Boston MA USA. Electronic address: clarissa@nmr.mgh.harvard.edu. Harvard Medical School Boston MA USA. A. A. Martinos Center for Biomedical Imaging Department of Radiology Massachusetts General Hospital Charlestown MA USA. Dept. of Radiology Medical Physics Medical Center University of Freiburg Faculty of Medicine University of Freiburg Freiburg Germany. Institute of Electrical Engineering Chinese Academy of Sciences Beijing China. Procyon Engineering San Jose CA USA Department of Electrical Engineering Stanford University Stanford CA USA. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Harvard-MIT Division of Health Sciences Technology Cambridge MA USA. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA. Harvard Medical School Boston MA USA

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Constraints on the Intergalactic and Local Dispersion Measure of Fast Radio Bursts with the CHIME/FRB far side-lobe events

arXiv

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arXiv 2023年

作者： Lin, Hsiu-Hsien Scholz, Paul Ng, Cherry Pen, Ue-Li Li, D.Z. Newburgh, Laura Reda, Alex Andersen, Bridget Bandura, Kevin Bhardwaj, Mohit Brar, Charanjot Cassanelli, Tomas Chawla, Pragya Cook, Amanda M. Curtin, Alice P. Dobbs, Matt Dong, Fengqiu Adam Fonseca, Emmanuel Gaensler, B.M. Giri, Utkarsh Hill, Alex S. Kaczmarek, Jane Kania, Joseph Kaspi, Victoria Khairy, Kholoud Leung, Calvin Masui, Kiyoshi W. Mena-Parra, Juan Meyers, Bradley W. Ordog, Anna Pearlman, Aaron B. Pleunis, Ziggy Rafiei-Ravandi, Masoud Rahman, Mubdi Ransom, Scott Sand, Ketan R. Sanghavi, Pranav Shin, Kaitlyn Smith, Kendrick Stairs, Ingrid Tendulkar, Shriharsh P. Vanderlinde, Keith Wulf, Dallas Institute of Astronomy and Astrophysics Academia Sinica Astronomy-Mathematics Building No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Canadian Institute for Theoretical Astrophysics 60 St. George Street TorontoONM5S 3H8 Canada Dunlap Institute for Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Department of Physics and Astronomy York University 4700 Keele Street TorontoONMJ3 1P3 Canada Canadian Institute for Advanced Research MaRS Centre West Tower 661 University Avenue Suite 505 Canada Perimeter Institute for Theoretical Physics 31 Caroline Street N WaterlooONN25 2YL Canada TAPIR Walter Burke Institute for Theoretical Physics Mail Code 350-17 Caltech PasadenaCA91125 United States Department of Physics Yale University New HavenCT06520 United States Department of Physics McGill University 3600 rue University MontréalQCH3A 2T8 Canada Trottier Space Institute McGill University 3550 rue University MontréalQCH3A 2A7 Canada Lane Department of Computer Science and Electrical Engineering 1220 Evansdale Drive PO Box 6109 MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States Department of Physics Carnegie Mellon University 5000 Forbes Avenue PittsburghPA15213 United States Department of Electrical Engineering Universidad de Chile Av. Tupper 2007 Santiago8370451 Chile Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Department of Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road VancouverBCV6T 1Z1 Canada Department of Physics and Astronomy West Virginia University P.O. Box 6315 MorgantownWV26506 United States Department of Physics University of Wisconsin-Madison 1150 Univers

We study the 10 fast radio bursts (FRBs) detected in the far side-lobe region of the CHIME telescope from 2018 August 28 to 2021 August 31. We find that the far side-lobe events have on average ∼500 times greater fluxes than events detected in CHIME’s main lobe. We show that the side-lobe sample is therefore statistically ∼20 times closer than the main-lobe sample. The median dispersion measure (DM) excess, after removing the Galactic disk component using the NE2001 for the free electron density distribution of the Milky Way, of the 10 far side-lobe and 471 non-repeating main-lobe FRBs in the first CHIME/FRB catalog is 183.0 and 433.9 pc cm−3, respectively. By comparing the DM excesses of the two populations under reasonable assumptions, we statistically constrain that the local degenerate contributions (from the Milky Way halo and the host galaxy) and the intergalactic contribution to the excess DM of the 471 non-repeating main-lobe FRBs for the NE2001 model are 131.2−158.3 and 302.7−275.6 pc cm−3, respectively, which corresponds to a median redshift for the main-lobe FRB sample of ∼0.3. These constraints are useful for population studies of FRBs, and in particular for constraining the location of the missing baryons. Copyright © 2023, The Authors. All rights reserved.

关键词： Galaxies

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Shape-independent hardness estimation using deep learning and a GelSight tactile sensor

Shape-independent hardness estimation using deep learning an...

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2017 IEEE International Conference on Robotics and Automation, ICRA 2017

作者： Yuan, Wenzhen Zhu, Chenzhuo Owens, Andrew Srinivasan, Mandayam A. Adelson, Edward H. MIT CambridgeMA02139 United States CSAIL MIT CambridgeMA United States Electrical Engineering and Computer Science Department U.C. Berkeley and CSAIL MIT CambridgeMA02139 United States Research Laboratory of Electronics Department of Mechanical Engineering MIT CambridgeMA02139 United States Department of Brain and Cognitive Sciences CSAIL MIT CambridgeMA02139 United States

ISBN: (纸本)9781509046331

Hardness is among the most important attributes of an object that humans learn about through touch. However, approaches for robots to estimate hardness are limited, due to the lack of information provided by current tactile sensors. In this work, we address these limitations by introducing a novel method for hardness estimation, based on the GelSight tactile sensor, and the method does not require accurate control of contact conditions or the shape of objects. A GelSight has a soft contact interface, and provides high resolution tactile images of contact geometry, as well as contact force and slip conditions. In this paper, we try to use the sensor to measure hardness of objects with multiple shapes, under a loosely controlled contact condition. The contact is made manually or by a robot hand, while the force and trajectory are unknown and uneven. We analyze the data using a deep constitutional (and recurrent) neural network. Experiments show that the neural net model can estimate the hardness of objects with different shapes and hardness ranging from 8 to 87 in Shore 00 scale. © 2017 IEEE.

关键词： Hardness

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Structural properties of multiple zeta values

arXiv

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arXiv 2018年

作者： Wakhare, Tanay Vignat, Christophe Department of Electrical Engineering and Computer Science MIT CambridgeMA02139 United States LSS Centrale Supelec Univerité Paris Saclay Gif sur Yvette91192 France Department of Mathematics Tulane University New OrleansLA70118 United States

We study some classical identities for multiple zeta values and show that they still hold for zeta functions built from an arbitrary sequence of nonzero complex numbers. We introduce the complementary zeta function of a system, which naturally occurs when lifting identities for multiple zeta values to identities for quasisymmetric functions. Copyright © 2018, The Authors. All rights reserved.

关键词： Functions

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The Brain Tumor Sequence Registration (BraTS-Reg) Challenge: Establishing Correspondence Between Pre-Operative and Follow-up MRI Scans of Diffuse Glioma Patients

arXiv

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arXiv 2021年

作者： Baheti, Bhakti Chakrabarty, Satrajit Akbari, Hamed Bilello, Michel Wiestler, Benedikt Schwarting, Julian Calabrese, Evan Rudie, Jeffrey Abidi, Syed Mousa, Mina Villanueva-Meyer, Javier Fields, Brandon K.K. Kofler, Florian Shinohara, Russell Takeshi Iglesias, Juan Eugenio Mok, Tony C.W. Chung, Albert C.S. Wodzinski, Marek Jurgas, Artur Marini, Niccolò Atzori, Manfredo Müller, Henning Grosbröhmer, Christoph Siebert, Hanna Hansen, Lasse Heinrich, Mattias P. Canalini, Luca Klein, Jan Gerken, Annika Heldmann, Stefan Hering, Alessa Hahn, Horst K. Meng, Mingyuan Bi, Lei Feng, Dagan Kim, Jinman Zeineldinal, Ramy A. Karar, Mohamed E. Mathis-Ullrich, Franziska Burgert, Oliver Abderezaei, Javid Pionteck, Aymeric Chopra, Agamdeep Kurt, Mehmet Yan, Kewei Yan, Yonghong Tang, Zhe Ma, Jianqiang Nasser, Sahar Almahfouz Kurian, Nikhil Cherian Meena, Mohit Shamsi, Saqib Sethi, Amit Tustison, Nicholas J. Avants, Brian B. Cook, Philip Gee, James C. Tian, Lin Greer, Hastings Niethammer, Marc Hoopesar, Andrew Hoffmannas, Malte Dalcaar, Adrian V. Christodoulidis, Stergios Estiene, Théo Vakalopoulou, Maria Paragios, Nikos Marcus, Daniel S. Davatzikos, Christos Sotiras, Aristeidis Menze, Bjoern Bakas, Spyridon Waldmannstetter, Diana Division of Computational Pathology Department of Pathology and Laboratory Medicine Indiana University School of Medicine IndianapolisIN United States Department of Electrical and Systems Engineering Washington University in St. Louis St. LouisMO United States GE HealthCare San RamonCA United States University of Pennsylvania PhiladelphiaPA United States Department of Radiology Perelman School of Medicine University of Pennsylvania PhiladelphiaPA United States Mallinckrodt Institute of Radiology Washington University School of Medicine St. LouisMO United States Institute for Informatics Data Science & Biostatistics Washington University School of Medicine St. LouisMO United States Department of Bioengineering Santa Clara University Santa ClaraCA United States Department of Quantitative Biomedicine University of Zurich Zurich Switzerland Department of Computer Science TUM School of Computation Information and Technology Technical University of Munich Munich Germany Department of Diagnostic and Interventional Neuroradiology School of Medicine Klinikum rechts der Isar Technical University of Munich Munich Germany Department of Nuclear Medicine University Hospital Regensburg Regensburg Germany University Hospital Regensburg Regensburg Germany Department of Radiology & Biomedical Imaging University of California San FranciscoCA United States Department of Radiology Duke University Medical Center DurhamNC United States Department of Radiology University of California San DiegoCA United States Helmholtz AI Helmholtz Munich Neuherberg Germany Penn Statistics in Imaging and Visualization Center Department of Biostatistics Epidemiology and Informatics University of Pennsylvania Philadelphia United States Massachusetts General Hospital Harvard Medical School United States Centre for Medical Imaging Computing University College London United Kingdom The Hong Kong University of Science and Technology Hong Kong University of Applied Sciences West

Registration of longitudinal brain Magnetic Resonance Imaging (MRI) scans containing pathologies is challenging due to dramatic changes in tissue appearance. Although there has been considerable progress in developing general-purpose medical image registration techniques, they have not yet attained the requisite precision and reliability for this task, highlighting its inherent complexity. Here we describe the Brain Tumor Sequence Registration (BraTS-Reg) challenge, as the first public benchmark environment for deformable registration algorithms focusing on estimating correspondences between pre-operative and follow-up scans of the same patient diagnosed with a diffuse brain glioma. The challenge was conducted in conjunction with both the IEEE International Symposium on Biomedical Imaging (ISBI) 2022 and the International Conference on Medical Image Computing and computer-Assisted Intervention (MICCAI) 2022. The BraTS-Reg data comprise de-identified multi-institutional multi-parametric MRI (mpMRI) scans, curated for size and resolution according to a canonical anatomical template, and divided into training, validation, and testing sets. Clinical experts annotated ground truth (GT) landmark points of anatomical locations distinct across the temporal domain. The training data with their GT annotations, were publicly released to enable the development of registration algorithms. The validation data, without their GT annotations, were also released to allow for algorithmic evaluation prior to the testing phase, which only allowed submission of containerized algorithms for evaluation on hidden hold-out testing data. Quantitative evaluation and ranking was based on the Median Euclidean Error (MEE), Robustness, and the determinant of the Jacobian of the displacement field. The top-ranked methodologies yielded similar performance across all evaluation metrics and shared several methodological commonalities, including pre-alignment, deep neural networks, inverse consistency

关键词： Magnetic resonance imaging

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One-way travel-time inverted ultra-short baseline localization for low-cost autonomous underwater vehicles

One-way travel-time inverted ultra-short baseline localizati...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： Nicholas R. Rypkema Erin M. Fischell Henrik Schmidt Electrical Engineering and Computer Science Department MIT Cambridge MA USA Mechanical Engineering Department MIT Cambridge MA USA

This paper presents an acoustic localization system for small and low-cost autonomous underwater vehicles (AUVs). Accurate and robust localization for low-cost AUVs would lower the barrier toward multi-AUV research in river and ocean environments. However, these AUVs introduce size, power, and cost constraints that prevent the use of conventional AUV sensors and acoustic positioning systems, adding great difficulty to the problem of underwater localization. Our system uses a single acoustic transmitter placed at a reference point and is acoustically passive on the AUV, reducing cost and power use, and enabling multi-AUV localization. The AUV has an ultra-short baseline (USBL) receiver array that uses one-way travel-time (OWTT) and phased-array beamforming to calculate range, azimuth, and inclination to the transmitter, providing an instantaneous estimate of the vehicle location. This estimate is fed to a particle filter and graph-based smoothing algorithm to generate a consistent AUV trajectory. We describe the complete processing pipeline of our system, and present results based on experiments using a low-cost AUV. To the authors' knowledge, this work constitutes the first practical demonstration of the feasibility of OWTT inverted USBL navigation for AUVs.

关键词： Acoustics Sonar equipment Array signal processing Global Positioning System Acoustic arrays Data acquisition

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Optimization of surface-mount permanent magnet synchronous machines for low duty-cycle, high-Torque applications

Optimization of surface-mount permanent magnet synchronous m...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Angle, Matthew G. Lang, Jeffrey H. Kirtley, James L. Kim, Sangbae Otten, David Department of Electrical Engineering and Computer Science MIT Cambridge United States Department of Mechanical Engineering MIT Cambridge United States

ISBN: (纸本)9781509042814

A motor is designed and tested for the mit Robotic Cheetah project. The robot presents unique motor design challenges as it contains eight separate motors with different drive cycles, each consisting of short duration large torque commands followed by periods of lesser torque requirement. The ratio between maximum torque and rated torque is approximately 10:1. A design was selected through use of a brute-force grid sweep that makes use of a fast-running hybrid modeling technique. This design was then built and tested, resulting in a machine that weighs 810 g and produces 30 Nm of torque, or 60%c of the mass and 300% of the torque of a commercially-Available machine with the same outer diameter. © 2017 IEEE.

关键词： Torque

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Coherent multiple-antenna block-fading channels at finite blocklength

arXiv

引用

arXiv 2017年

作者： Collins, Austin Polyanskiy, Yury Department of Electrical Engineering and Computer Science MIT CambridgeMA02139 United States

In this paper we consider a channel model that is often used to describe the mobile wireless scenario: multiple-antenna additive white Gaussian noise channels subject to random (fading) gain with full channel state information at the receiver. Dynamics of the fading process are approximated by a piecewise-constant process (frequency non-selective isotropic block fading). This work addresses the finite blocklength fundamental limits of this channel model. Specifically, we give a formula for the channel dispersion - a quantity governing the delay required to achieve capacity. The multiplicative nature of the fading disturbance leads to a number of interesting technical difficulties that required us to enhance traditional methods for finding the channel dispersion. Alas, one difficulty remains: the converse (impossibility) part of our result holds under an extra constraint on the growth of the peak-power with blocklength. Our results demonstrate, for example, that while capacities of nt × nr and nr × nt antenna configurations coincide (under fixed received power), the coding delay can be sensitive to this switch. For example, at the received SNR of 20 dB the 16 × 100 system achieves capacity with codes of length (delay) which is only 60% of the length required for the 100 × 16 system. Another interesting implication is that for the MISO channel, the dispersion-optimal coding schemes require employing orthogonal designs such as Alamouti's scheme - a surprising observation considering the fact that Alamouti's scheme was designed for reducing demodulation errors, not improving coding rate. Finding these dispersion-optimal coding schemes naturally gives a criteria for producing orthogonal design-like inputs in dimensions where orthogonal designs do not exist. Copyright © 2017, The Authors. All rights reserved.

关键词： Gaussian noise (electronic)

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Sum of squares certificates for stability of planar, homogeneous, and switched systems

arXiv

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arXiv 2017年

作者： Ahmadi, Amir Ali Parrilo, Pablo A. Department of Operations Research and Financial Engineering Princeton University Department of Electrical Engineering and Computer Science Mit

We show that existence of a global polynomial Lyapunov function for a homogeneous polynomial vector field or a planar polynomial vector field (under a mild condition) implies existence of a polynomial Lyapunov function that is a sum of squares (sos) and that the negative of its derivative is also a sum of squares. This result is extended to show that such sos-based certificates of stability are guaranteed to exist for all stable switched linear systems. For this class of systems, we further show that if the derivative inequality of the Lyapunov function has an sos certificate, then the Lyapunov function itself is automatically a sum of squares. These converse results establish cases where semidefinite programming is guaranteed to succeed in finding proofs of Lyapunov inequalities. Finally, we demonstrate some merits of replacing the sos requirement on a polynomial Lyapunov function with an sos requirement on its top homogeneous component. In particular, we show that this is a weaker algebraic requirement in addition to being cheaper to impose computationally. Copyright © 2017, The Authors. All rights reserved.

关键词： Polynomials

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