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arXiv 2017年

作者： Price, D.C. Greenhill, L.J. Fialkov, A. Bernardi, G. Garsden, H. Barsdell, B.R. Kocz, J. Anderson, M.M. Bourke, S.A. Craig, J. Dexter, M.R. Dowell, J. Eastwood, M.W. Eftekhari, T. Ellingson, S.W. Hallinan, G. Hartman, J.M. Kimberk, R. W. Lazio, T. Joseph Leiker, S. MacMahon, D. Monroe, R. Schinzel, F. Taylor, G.B. Tong, E. Werthimer, D. Woody, D.P. Harvard-Smithsonian Center for Astrophysics 60 Garden Street CambridgeMA02138 United States University of California Berkeley 501 Campbell Hall BerkeleyCA94720 United States Centre for Astrophysics & Supercomputing Swinburne University of Technology PO Box 218 HawthornVIC3122 Australia SKA SA 3rd Floor The Park Park Road Pinelands7405 South Africa Department of Physics and Electronics Rhodes University PO Box 94 Grahamstown6140 South Africa NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States California Institute of Technology 1200 E California Blvd PasadenaCA91125 United States Department of Physics and Astronomy University of New Mexico AlbuquerqueNM87131 United States Bradley Dept. of Electrical & Computer Engineering Virginia Tech BlacksburgVA24061 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr. PasadenaCA91106 United States National Radio Astronomy Observatory P.O. Box O SocorroNM87801 United States

The Large-Aperture Experiment to Detect the Dark Age (LEDA) was designed to detect the predicted O(100) mK sky-averaged absorption of the Cosmic Microwave Background by Hydrogen in the neutral pre- and intergalactic medium just after the cosmological Dark Age. The spectral signature would be associated with emergence of a diffuse Lyα background from starlight during ‘Cosmic Dawn’. Recently, Bowman et al. (2018) have reported detection of this predicted absorption feature, with an unexpectedly large amplitude of 530 mK, centered at 78 MHz. Verification of this result by an independent experiment, such as LEDA, is pressing. In this paper, we detail design and characterization of the LEDA radiometer systems, and a first-generation pipeline that instantiates a signal path model. Sited at the Owens Valley Radio Observatory Long Wavelength Array, LEDA systems include the station correlator, five well-separated redundant dual polarization radiometers and backend electronics. The radiometers deliver a 30–85 MHz band (16 Copyright © 2017, The Authors. All rights reserved.

关键词： Radiometers

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The ${\cal H}_{2} $ Control Problem for Quadratically Invariant Systems With Delays

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IEEE Transactions on Automatic Control 2015年第7期60卷 1945-1950页

作者： Andrew Lamperski John C. Doyle Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA Control and Dynamical Systems California Institute of Technology Pasadena CA USA

This technical note gives a new solution to the output feedback H 2 problem for quadratically invariant communication delay patterns. A characterization of all stabilizing controllers satisfying the delay constraints is given and the decentralized H 2 problem is cast as a convex model matching problem. The main result shows that the model matching problem can be reduced to a finite-dimensional quadratic program. A recursive state-space method for computing the optimal controller based on vectorization is given.

关键词： Delays Computational modeling Finite impulse response filters Matrix decomposition Optimal control Regulators Dynamic programming

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(OA32) Chronic Radiation-Associated Dysphagia in Oropharyngeal Cancer Survivors: Towards Age-Adjusted Dose Constraints for Deglutitive Muscles

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International Journal of Radiation Oncology*Biology*Physics 2018年第2期101卷 e14-e14页

作者： Kaitlin Christopherson Alokananda Ghosh Abdallah Sherif Radwan Mohamed Mona Jomaa G. Brandon Gunn Liz Marai Guadalupe Canahuate David Vock Timothy Dale Jayashree Kalpathy-Cramer Jay Messer Adam S. Garden Hesham Elhalawani Steven J. Frank Jan Lewin Stephen Y. Lai Beth M. Beadle William H. Morrison Clifton D. Fuller Department of Radiation Oncology The University of Texas MD Anderson Cancer Center Houston TX USA Department of Biostatistics University of Texas School of Public Health Houston TX USA Department of Clinical Oncology University of Alexandria Alexandria Egypt Head and Neck Surgery The University of Texas MD Anderson Cancer Center Houston TX USA Department of Computer Science University of Pittsburgh Pittsburgh PA Thoracic & Head and Neck Oncology The University of Texas MD Anderson Cancer Center Houston TX USA Department of Electrical and Computer Engineering The University of Iowa Iowa City IA Division of Biostatistics School of Public Health University of Minnesota Minneapolis MN Baylor College of Medicine Houston TX USA Athinoula A. Martinos Center for Biomedical Imaging/Massachusetts General Hospital/Massachusetts Institute of Technology Charlestown MA USA Department of Radiation Oncology The University of Texas Medical Branch Galveston TX USA Department of Radiation Oncology Stanford University Palo Alto CA USA Medical Physics Program The University of Texas Graduate School of Biomedical Sciences Houston TX USA

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Computation of Kamada-Kawai Algorithm Using Barzilai-Borwein Method

Computation of Kamada-Kawai Algorithm Using Barzilai-Borwein...

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Lukas Pospisil Martin Hasal Jana Nowakova Jan Platos Faculty of Electrical Engineering and Computer Science VŠB-Technical University of Ostrava Ostrava Czech Republic Faculty of Electrical Engineering and Computer Science Institute of Geonics AS CR Ostrava Czech Republic Faculty of Electrical Engineering and Computer Science VŠB-Technical University of Ostrava IT4Innovations National Supercomputing Center Ostrava Czech Republic

Graph type of data may be found all around us and it can help to simplify the description of many very complicated situations as well as it presents a different description of any complex system with respect to mutual relationships between system parts. There is lot of known methods for graph drawing. In the paper it is suggested to use the algorithm presented by Kamada and Kawai. The main idea of the presented work is to present the comparison of classic Kamada-Kawai algorithm with Newton-Raphson method used for the minimization and the Kamada-Kawai algorithm with Barzilai-Borwein method used instead the Newton-Raphson method. For all cases the results are presented in 2D. As it was proved the computation time was rapidly changed using the suggested Barzilai-Borwein.

关键词： Minimization Approximation algorithms Layout Clustering algorithms Newton method Springs Optimization

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Finding high-redshift strong lenses in DES using convolutional neural networks

arXiv

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arXiv 2018年

作者： Jacobs, C. Collett, T. Glazebrook, K. McCarthy, C. Qin, A.K. Abbott, T.M.C. Abdalla, F.B. Annis, J. Avila, S. Bechtol, K. Bertin, E. Brooks, D. Buckley-Geer, E. Burke, D.L. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. da Costa, L.N. Davis, C. de Vicente, J. Desai, S. Diehl, H.T. Doel, P. Eifler, T.F. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Gerdes, D.W. Goldstein, D.A. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hartley, W.G. Hollowood, D.L. Honscheid, K. Hoyle, B. James, D.J. Kuehn, K. Kuropatkin, N. Lahav, O. Li, T.S. Lima, M. Lin, H. Maia, M.A.G. Martini, P. Miller, C.J. Miquel, R. Nord, B. Plazas, A.A. Sanchez, E. Scarpine, V. Schubnell, M. Serrano, S. Sevilla-Noarbe, I. Smith, M. Soares-Santos, M. Sobreira, F. Suchyta, E. Swanson, M.E.C. Tarle, G. Vikram, V. Walker, A.R. Zhang, Y. Zuntz, J. Centre for Astrophysics & Supercomputing Swinburne University of Technology Victoria3122 Australia Institute of Cosmology & Gravitation University of Portsmouth PortsmouthPO1 3FX United Kingdom School of Software and Electrical Engineering Swinburne University of Technology P.O. Box 218 HawthornVIC3122 Australia Cerro Tololo Inter-American Observatory National Optical Astronomy Observatory Casilla 603 La Serena Chile Department of Physics & Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Department of Physics and Electronics Rhodes University PO Box 94 Grahamstown6140 South Africa Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States LSST 933 North Cherry Avenue TucsonAZ85721 United States CNRS UMR 7095 Institut d’Astrophysique de Paris ParisF-75014 France Sorbonne Universités UPMC Univ Paris 06 UMR 7095 Institut d’Astrophysique de Paris ParisF-75014 France Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 Rio de Janeiro RJ20921-400 Brazil Observatório Nacional Rua Gal. José Cristino 77 Rio de Janeiro RJ20921-400 Brazil Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Barcelona Institute of Science and Technology Campus UAB Bellaterra [Barcelona08193 Spain Madrid Spain Department of Physics IIT Hyderabad KandiTelangana502285 India Department of Astronomy/Steward Observatory 933 North Cherry Avenue TucsonAZ85721-0065 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr. PasadenaCA91109 United States Kavli Institute for Cosmological Physics

We search Dark Energy Survey (DES) Year 3 imaging data for galaxy-galaxy strong gravitational lenses using convolutional neural networks. We generate 250,000 simulated lenses at redshifts > 0.8 from which we create a data set for training the neural networks with realistic seeing, sky and shot noise. Using the simulations as a guide, we build a catalogue of 1.1 million DES sources with 1.8 19, g_mag > 20 and i_mag > 18.2. We train two ensembles of neural networks on training sets consisting of simulated lenses, simulated non-lenses, and real sources. We use the neural networks to score images of each of the sources in our catalogue with a value from 0 to 1, and select those with scores greater than a chosen threshold for visual inspection, resulting in a candidate set of 7,301 galaxies. During visual inspection we rate 84 as "probably" or "definitely" lenses. Four of these are previously known lenses or lens candidates. We inspect a further 9,428 candidates with a different score threshold, and identify four new candidates. We present 84 new strong lens candidates, selected after a few hours of visual inspection by astronomers. This catalogue contains a comparable number of high-redshift lenses to that predicted by simulations. Based on simulations we estimate our sample to contain most discoverable lenses in this imaging and at this redshift range. Copyright © 2018, The Authors. All rights reserved.

关键词： Lenses

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Restricted Isometry Property of Random Subdictionaries

Restricted Isometry Property of Random Subdictionaries

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作者： Barg, Alexander Mazumdar, Arya Wang, Rongrong Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College ParkMD20742 United States Institute for Problems of Information Transmission Russian Academy of Sciences Moscow Russia University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Minnesota-Twin Cities MinneapolisMN55455 United States Department of Mathematics University of British Columbia VancouverBC V6T 1Z4 Canada

We study statistical restricted isometry, a property closely related to sparse signal recovery, of deterministic sensing matrices of size m \times N. A matrix is said to have a statistical restricted isometry property (StRIP) of order k if most submatrices with k columns define a near-isometric map of {\mathbb R}^{k} into {\mathbb R}^{m}. As our main result, we establish sufficient conditions for the StRIP property of a matrix in terms of the mutual coherence and mean square coherence. We show that for many existing deterministic families of sampling matrices, m=O(k) rows suffice for k-StRIP, which is an improvement over the known estimates of either m = \Theta (k \log N) or m = \Theta (k\log k). We also give examples of matrix families that are shown to have the StRIP property using our sufficient conditions. © 1963-2012 IEEE.

关键词： Linear matrix inequalities

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From categorical to numerical: Multiple transitive distance learning and embedding

From categorical to numerical: Multiple transitive distance ...

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SIAM International Conference on Data Mining 2015, SDM 2015

作者： Zhang, Kai Wang, Qiaojun Chen, Zhengzhang Marsic, Ivan Kumar, Vipin Jiang, Guofei Zhang, Jie School of Computer Science Southwest Petroleum University Chengdu Sichuan Province610500 China Institute of Data Science and Technology Alibaba Group SeattleWA98101 United States Department of Electrical and Computer Engineering Rutger-s the State University of New Jersey NJ08854 United States NEC Laboratories America Inc. PrincetonNJ08540 United States Department of Electrical Engineering and Computer Science Northwestern University EvanstonIL60208 United States Department of Computer Science and Engineering University of Minnesota MinneapolisMN55455 United States Center for Computational Systems Biology Fudan University Shanghai200433 China

ISBN: (纸本)9781510811522

Categorical data are ubiquitous in real-world databases. However, due to the lack of an intrinsic proximity measure, many powerful algorithms for numerical data analysis may not work well on their categorical counterparts, making it a bottleneck in practical applications. In this paper, we propose a novel method to transform categorical data to numerical representations, so that abundant numerical learning methods can be exploited in categorical data mining. Our key idea is to learn a pairwise dissimilarity among categorical symbol-s, henceforth a continuous embedding, which can then be used for subsequent numerical treatment. There are two important criteria for learning the dissimilarities. First, it should capture the important "transitivity" which has shown to be particularly useful in measuring the proximity relation in categorical data. Second, the pairwise sample geometry arising from the learned symbol distances should be maximally consistent with prior knowledge (e.g., class labels) to obtain a good generalization performance. We achieve them through multiple transitive distance learning and embedding. Encouraging results are observed on a number of benchmark classification tasks against state-of-the-art. Copyright © SIAM.

关键词： Distance education

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The design, systems integration, and testing of a multi-purpose, autonomous, small unmanned aerial system 46

The design, systems integration, and testing of a multi-purp...

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46th Annual International Symposium of the Society of Flight Test Engineers 2015

作者： Brady, Jesse Lauer, Nathan Katona, Brian Branyan, Callie Goodstein, Mack Gupta, Ateev Katzman, Jon Krause, Joel Siburt, Matthew Smith, Melissa Szczubelek, Jeffrey Weber, Adam Mechanical Engineering University of Alaska Anchorage United States Aerospace Engineering Computer Scienc University of Marylande United States Kent State University Aeronautics United States Mechanical Engineering University of Arizona United States Electrical and Computer Engineering University at Buffalo United States Mechanical Engineering Purdue University United States Aerospace Engineering University of Miami United States Aerospace Engineering University of Minnesota United States Aerospace Engineering Mechanical Engineering West Virginia University United States Aerospace Engineering Rensselaer Polytechnic Institute United States Technology and Education Wilmington University United States Aerospace Engineering University of Michigan United States

ISBN: (纸本)9781510813724

The 2014 Langley Aeronautics Academy, which consisted of a multi-disciplinary team of twelve student researchers, was challenged to design, build, and test fly a cost effective, fully autonomous, dual-use, small Unmanned Aerial System (sUAS) in a ten- week time frame. This airborne science platform was designed for applications in Precision Agriculture (PA) and Search and Rescue (SAR) missions, while legally operating within the National Airspace System (NAS). Two tiers of success were defined for each application, the threshold and the objective. The threshold represented the adequate level of performance, while the objective represented the ideal operating capability of the respective application. The threshold level of success for the SAR mission was to demonstrate the flight endurance to transit two kilometers to a search grid, image a four square kilometer area while transmitting a real-time video downlink of the search area to a ground station, and then transit another two kilometers to return to the point of launch. Additionally, the SAR objective required the sUAS to autonomously locate people in the search grid. The threshold level of success for the PA application was to demonstrate the flight endurance to image a one thousand acre farm in a single flight and to discern stressed plants to a resolution of one foot, through use of the Normalized Difference Vegetation Index, while flying at altitudes up to 400 feet. Additionally, the objective was to autonomously provide an orthorectified map indicating the location of the stressed plants. Self-set goals were then established as PA and SAR applications were researched and professionals in the respective fields were interviewed to determine opportunities for improvement. Human factors engineering was a main consideration throughout the project lifecycle, from preliminary design through test flight, as this system was developed for use by individuals without technical experience. Upon investigation, it was dete

关键词： Cost effectiveness

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Comparison of Pulsar Positions from Timing and Very Long Baseline Astrometry

arXiv

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arXiv 2017年

作者： Wang, J.B. Coles, W.A. Hobbs, G. Shannon, R.M. Manchester, R.N. Kerr, M. Yuan, J.P. Wang, N. Bailes, M. Bhat, N.D.R. Dai, S. Dempsey, J. Keith, M.J. Lasky, P.D. Levin, Y. Lowski, S. Os Ravi, V. Reardon, D.J. Rosado, P.A. Russell, C.J. Spiewak, R. van Straten, W. Toomey, L. Wen, L. You, X.-P. Zhu, X.-J. Xinjiang Astronomical Observatory Chinese Academy of Science 150 Science 1-Street Urumqi Xinjiang830011 China Key Laboratory of Radio Astronomy Chinese Academy of Science 150 Science 1-Street Urumqi Xinjiang830011 China CSIRO Astronomy & Space Science PO Box 76 EppingNSW1710 Australia Electrical and Computer Engineering University of California at San Diego La JollaCA United States International Centre for Radio Astronomy Research Curtin University BentleyWA6102 Australia Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC20375 United States Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 HawthornVIC3122 Australia CSIRO Information Management & Technology Box 225 DicksonACT2602 Jodrell Bank Centre for Astrophysics University of Manchester M13 9PL United Kingdom Monash Centre for Astrophysics School of Physics and Astronomy Monash University VIC3800 Australia Cahill Center for Astronomy and Astrophysics California Institute of Technology MC 249-17 PasadenaCA91125 United States CSIRO Scientific Computing Services Australian Technology Park Locked Bag 9013 AlexandriaNSW1435 Australia School of Physics University of Western Australia CrawleyWA6009 Australia School of Physical Science and Technology Southwest University Chongqing400715 China

Pulsar positions can be measured with high precision using both pulsar timing methods and very-long-baseline interferometry (VLBI). Pulsar timing positions are referenced to a solar-system ephemeris, whereas VLBI positions are referenced to distant quasars. Here we compare pulsar positions from published VLBI measurements with those obtained from pulsar timing data from the Nanshan and Parkes radio telescopes in order to relate the two reference frames. We find that the timing positions differ significantly from the VLBI positions (and also differ between different ephemerides). A statistically significant change in the obliquity of the ecliptic of 2.16 ± 0.33 mas is found for the JPL ephemeris DE405, but no significant rotation is found in subsequent JPL ephemerides. The accuracy with which we can relate the two frames is limited by the current uncertainties in the VLBI reference source positions and in matching the pulsars to their reference source. Not only do the timing positions depend on the ephemeris used in computing them, but also different segments of the timing data lead to varying position estimates. These variations are mostly common to all ephemerides, but slight changes are seen at the 10µas level between ephemerides. Copyright © 2017, The Authors. All rights reserved.

关键词： Pulsars

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Synrtgistic effects of nanotopography and surface matrix patterning on contact guided migration of human breast cancer cells 19

Synrtgistic effects of nanotopography and surface matrix pat...

引用

19th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2015

作者： Nam, K.H. Kim, P. Provenzano, P.P. Kwon, S. Kim, D.H. Department of Bioengineering University of Washington SeattleWA98195 United States Division of Instrumentation Development Korea Basic Science Institute Deajeon305-806 Korea Republic of Institute for Stem Cell and Regenerative Medicine Center for Cardiovascular Biology University of Washington SeattleWA98195 United States Department of Biomedical Engineering Masonic Cancer Center Stem Cell Institute University of Minnesota MinneapolisMN55455 United States Department of Electrical and Computer Engineering Seoul National University Seoul151-742 Korea Republic of Center for Nanoparticle Research Institute for Basic Science Seoul151-742 Korea Republic of

ISBN: (纸本)9780979806483

Cells are highly sensitive to topographic and mechanical features of the surrounding extracellular matrix (ECM) environment. Indeed, cells respond to these physical cues to coordinate adhesion-mediated signaling and the dynamic cytoskeletal remodeling underlying locomotion. Inspired by this biophysical relationship between cells and the ECM, particularly within the tumor microenvironment, we engineered an innovative biomimetic platform using substrate nanotopography and surface modification techniques in order to guide and promote the migration of oncogenic PIK3CA knockin mutants compared to their wild type non-transformed counterpart, MCF-10A human breast epithelial cells. Results demonstrate that human mammary epithelial cells collectively interact with the engineered microstructural environment, which regulates cell migration with increased velocity and persistence time. © 15CBMS-0001.

关键词： Cells

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