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arXiv 2020年

作者： Förster, Francisco Cabrera-Vives, G. Castillo-Navarrete, E. Estévez, P.A. Sánchez-Sáez, P. Arredondo, J. Bauer, F.E. Carrasco-Davis, R. Catelan, M. Elorrieta, F. Eyheramendy, S. Huijse, P. Pignata, G. Reyes, E. Reyes, I. Rodríguez-Mancini, D. Ruz-Mieres, D. Valenzuela, C. Álvarez-Maldonado, I. Astorga, N. Borissova, J. Clocchiatti, A. de Cicco, D. Donoso-Oliva, C. Graham, M.J. Kurtev, R. Mahabal, A. Maureira, J.C. Molina-Ferreiro, R. Moya, A. Palma, W. Prez-Carrasco, M. Protopapas, P. Romero, M. Sabatini-Gacitua, L. Snchez, A. San Martín, J. Sepúlveda-Cobo, C. Vera, E. Vergara, J.R. Center for Mathematical Modeling University of Chile AFB170001 Chile Millennium Institute of Astrophysics Nuncio Monseñor Sótero Sanz 100 Providencia Santiago Chile Departamento de Astronomía Universidad de Chile Casilla 36D Santiago Chile Department of Computer Science University of Concepcin Chile Department of Electrical Engineering Universidad de Chile Av. Tupper 2007 Santiago8320000 Chile Instituto de Astrofísica Facultad de Física Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul Santiago7820436 Chile Department of Engineering and Science Universidad Adolfo Ibaez Av. Diagonal Las Torres 2700 Santiago Chile Centro de Astroingeniería Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul Santiago7820436 Chile Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States Department of Mathematics and Computer Science Universidad de Santiago de Chile Av. Libertador Bernardo OHiggins 3663 Estación Central Santiago Chile Instituto de Informática Universidad Austral de Chile General Lagos 2086 Valdivia Chile Departamento de Ciencias Físicas Universidad Andres Bello Avda. Republica 252 Santiago Chile Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Instituto de Física y Astronomía Universidad de Valparaíso Av. Gran Bretaña 1111 Playa Ancha Casilla5030 Chile Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Center for Data Driven Discovery California Institute of Technology PasadenaCA91125 United States Institute for Applied Computational Science Harvard University CambridgeMA United States Departmento de Informática y Computación Universidad Tecnológica Metropolitana Santiago Chile

We introduce the Automatic Learning for the Rapid Classification of Events (ALeRCE) broker, an astronomical alert broker designed to provide a rapid and self–consistent classification of large etendue telescope alert streams, such as that provided by the Zwicky Transient Facility (ZTF) and, in the future, the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). ALeRCE is a Chilean–led broker run by an interdisciplinary team of astronomers and engineers, working to become intermediaries between survey and follow–up facilities. ALeRCE uses a pipeline which includes the real–time ingestion, aggregation, cross–matching, machine learning (ML) classification, and visualization of the ZTF alert stream. We use two classifiers: a stamp–based classifier, designed for rapid classification, and a light–curve–based classifier, which uses the multi–band flux evolution to achieve a more refined classification. We describe in detail our pipeline, data products, tools and services, which are made public for the community (see https://***). Since we began operating our real–time ML classification of the ZTF alert stream in early 2019, we have grown a large community of active users around the globe. We describe our results to date, including the real–time processing of 9.7×107 alerts, the stamp classification of 1.9 × 107 objects, the light curve classification of 8.5 × 105 objects, the report of 3088 supernova candidates, and different experiments using LSST-like alert streams. Finally, we discuss the challenges ahead to go from a single-stream of alerts such as ZTF to a multi–stream ecosystem dominated by LSST. Copyright © 2020, The Authors. All rights reserved.

关键词： Surveys

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Moving Object Real-time Detection and Tracking Method Based on Improved Gaussian Mixture Model

Moving Object Real-time Detection and Tracking Method Based ...

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IEEE data Driven Control and Learning Systems Conference

作者： Shanliang Zhu Xin Gao Haoyu Wang Guangwei Xu Qiuling Xie Shuguo Yang Research Center for Mathematical Modeling School of Mathematics and Physics Qingdao University of Science and Technology Qingdao 266061 China Finance Office Qingdao University of Science and Technology Qingdao 266061 China Institute of Intelligence Science & Data Technology School of Mathematics and Physics Qingdao University of Science and Technology Qingdao 266061 China

ISBN: (纸本)9781538626191

In order to improve the reliability of moving objects detection and tracking, this paper presents a method for moving object real-time detection and tracking based on Vibe and Gaussian mixture model (GMM). This method uses the "Virtual" background model that is trained by video sequence instead of the first frame image for background modeling. And then the foreground object is extracted based on the pixel classification. Finally, according to the morphological method, the clearer moving targets are conducted to realize the real-time detection and tracking. The experimental results show that, in comparison with the current mainstream background subtraction techniques, our approach effectively works on a wide range of complex scenarios, with faster detection speed and more reliable detection results.

关键词： Moving object detection Vibe Gaussian mixture model Pixel classification

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Elastic Neumann-Poincaré operators on three dimensional smooth domains: Polynomial compactness and spectral structure

arXiv

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arXiv 2017年

作者： Ando, Kazunori Kang, Hyeonbae Miyanishi, Yoshihisa Department of Electrical and Electronic Engineering and Computer Science Ehime University Ehime790-8577 Japan Department of Mathematics Inha University Incheon402-751 Korea Republic of Center for Mathematical Modeling and Data Science Osaka University Osaka560-8631 Japan

We prove that the elastic Neumann-Poincaré operator defined on the smooth boundary of a bounded domain in three dimensions, which is known to be noncompact, is in fact polynomially compact. As a consequence, we prove that the spectrum of the elastic Neumann-Poincaré operator consists of three non-empty sequences of eigenvalues accumulating to certain numbers determined by Lamé parameters. These results are proved using the surface Riesz transform, calculus of pseudodifferential operators and the spectral mapping theorem.35J47 (Primary), 35P05 (Secondary) Copyright © 2017, The Authors. All rights reserved.

关键词： mathematical operators

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Effectiveness of dispatcher instructions-dependent or independent bystander cardiopulmonary resuscitation on neurological survival among patients with out-of-hospital cardiac arrest

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Resuscitation 2019年 142卷 e103-e104页

作者： Hatakeyama, Toshihiro Kiguchi, Takeyuki Kobayashi, Daisuke Nakamura, Naotoshi Nishiyama, Chika Hayashida, Sumito Kiyohara, Kosuke Kitamura, Tetsuhisa Kawamura, Takashi Iwami, Taku Department of Emergency and Critical Care Medicine Emergency and Critical Care Center Dokkyo Medical University Saitama Medical Center Koshigaya City Japan Kyoto University Health Service Kyoto City Japan Center for Mathematical Modeling and Data Science Osaka University Toyonaka City Japan Department of Critical Care Nursing Kyoto University Graduate School of Human Health Science Kyoto City Japan Osaka Municipal Fire Department Osaka City Japan Department of Food Science Otsuma Women's University Chiyoda-ku Tokyo Japan Division of Environmental Medicine and Population Sciences Department of Social and Environmental Medicine Graduate School of Medicine Osaka University Suita City Japan

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Alert classification for the ALeRCE broker system: The light curve classifier

arXiv

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arXiv 2020年

作者： Sánchez-Sáez, Paula Reyes, I. Valenzuela, C. Förster, F. Eyheramendy, S. Elorrieta, F. Bauer, F.E. Cabrera-Vives, G. Estévez, P.A. Catelan, M. Pignata, G. Huijse, P. de Cicco, D. Arévalo, P. Carrasco-Davis, R. Abril, J. Kurtev, R. Borissova, J. Arredondo, J. Castillo-Navarrete, E. Rodriguez, D. Ruz-Mieres, D. Moya, A. Sabatini-Gacitúa, L. Sepúlveda-Cobo, C. Camacho-Iñiguez, E. Nuncio Monseñor Sótero Sanz 100 Providencia Santiago Chile Instituto de Astrofísica Facultad de Física Pontificia Universidad Católica de Chile Casilla 306 Santiago 22 Chile Faculty of Engineering and Sciences Universidad Adolfo Ibañez Diagonal Las Torres 2700 Peñalolén Santiago Chile Center for Mathematical Modeling Universidad de Chile Beauchef 851 North building 7th floor Santiago8320000 Chile Department of Electrical Engineering Universidad de Chile Av. Tupper 2007 Santiago8320000 Chile Data Observatory Diagonal Las Torres 2640 Peñalolén Santiago Chile Departmento de Matemáticas Facultad de Ciencia Universidad de Santiago de Chile Estación Central Av. Libertador Bernardo O'Higgins 3663 Santiago Chile Departamento de Astronomía Universidad de Chile Casilla 36D Santiago Chile Centro de Astroingeniería Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Macul Santiago7820436 Chile Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States Department of Computer Science University of Concepcón Edmundo Larenas 219 Concepción Chile Departamento de Ciencias Fisícas Universidad Andres Bello Avda. Republica 252 Santiago Chile Informatics Institute Universidad Austral de Chile General Lagos 2086 Valdivia Chile Instituto de Física y Astronomía Facultad de Ciencias Universidad de Valparaíso Gran Bretana No. 1111 Playa Ancha Valparaíso Chile Alonso de Córdova 3107 Vitacura Santiago Chile - Unidad Asociada al CSIC Plaza San Juan 1 TeruelE-44001 Spain

We present the first version of the ALeRCE (Automatic Learning for the Rapid Classification of Events) broker light curve classifier. ALeRCE is currently processing the Zwicky Transient Facility (ZTF) alert stream, in preparation for the Vera C. Rubin Observatory. The ALeRCE light curve classifier uses variability features computed from the ZTF alert stream, and colors obtained from AllWISE and ZTF photometry. We apply a Balanced Random Forest algorithm with a two-level scheme, where the top level classifies each source as periodic, stochastic, or transient, and the bottom level further resolves each of these hierarchical classes, amongst 15 total classes. This classifier corresponds to the first attempt to classify multiple classes of stochastic variables (including core- and host-dominated active galactic nuclei, blazars, young stellar objects, and cataclysmic variables) in addition to different classes of periodic and transient sources, using real data. We created a labeled set using various public catalogs (such as the Catalina Surveys and Gaia DR2 variable stars catalogs, and the Million Quasars catalog), and we classify all objects with ≥ 6 g-band or ≥ 6 r-band detections in ZTF (868,371 sources as of 2020/06/09), providing updated classifications for sources with new alerts every day. For the top level we obtain macro-averaged precision and recall scores of 0.96 and 0.99, respectively, and for the bottom level we obtain macro-averaged precision and recall scores of 0.57 and 0.76, respectively. Updated classifications from the light curve classifier can be found at the ALeRCE Explorer website. Copyright © 2020, The Authors. All rights reserved.

关键词： Surveys

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Spectral Structure of Elastic Neumann–Poincaré Operators

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Journal of Physics: Conference Series 2018年第1期965卷

作者： Yoshihisa Miyanishi Kazunori Ando Hyeonbae Kang Center for Mathematical Modeling and Data Science Osaka University Osaka 560-8631 Japan Department of Electrical and Electronic Engineering and Computer Science Ehime University Ehime 790-8577 Japan Department of Mathematics and Institute of Applied Mathematics Inha University Incheon 22212 S. Korea

In [1, 2], it is proved that the elastic Neumann–Poincaré operator defined on the smooth boundary of a bounded domain, which is known to be non-compact, is in fact polynomially compact. As a consequence, it is shown that the spectrum of the elastic Neumann-Poincaré operator consists of non-empty sets of eigenvalues accumulating to certain numbers determined by Lamé parameters. The purpose of this paper is to review these results and their proofs, and to discuss about some questions related to these results.

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Optimal Off-Exchange Execution with Closing Price

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Journal of mathematical Finance 2016年 7卷 54-64页

作者： Seiya Kuno Masamitsu Ohnishi Peilu Shimizu Center for Mathematical Modeling and Data Science Osaka University Osaka Japan Graduate School of Economics Osaka University Osaka Japan

The purpose of this paper is to examine whether the closing price guaranteed execution is possible contract, and if possible, how an institutional investor who affects the security price allocates execution volumes to both traditional trading and off-exchange (over-the-counter, OTC) trading venues. With a generalized price model at the traditional venue which considers the permanent impact effect explicitly, we derive an optimal execution strategy in the traditional trading venue and the allocation of the order volume to both venues in the framework of dynamic programming. By proving that an optimal execution strategy is in the static class, we further show that the closing price guaranteed contract may be established and the trading volume at the time of agreement of the contract can be controlled. Moreover, by some numerical examples, we illustrate a possibility for the institutional investor to manipulate the market in order to seek a profit under some trading situation.

关键词： Optimal Execution Algorithmic Trading Off-Exchange Trading Closing Price Guaranteed Execution

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The binary systems associated with short and long gamma-ray bursts and their detectability 14

The binary systems associated with short and long gamma-ray ...

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14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories

作者： Rueda, Jorge A. Aimuratov, Y. Barres De Almeida, U. Becerra, L. Bianco, C.L. Cherubini, C. Filippi, S. Karlica, M. Kovacevic, M. Melon Fuksman, J.D. Moradi, R. Muccino, M. Penacchioni, A.V. Pisani, G.B. Primorac, D. Ruffini, R. Sahakyan, N. Shakeri, S. Wang, Y. ICRANet Piazza Della Repubblica 10 PescaraI-65122 Italy Dip. di Fisica and ICRA Sapienza Università di Roma P.le Aldo Moro 5 RomeI-00185 Italy ICRANet-Rio Centro Brasileiro de Pesquisas Físicas Rua Dr. Xavier Sigaud 150 Rio de Janeiro22290-180 Brazil Université de Nice Sophia Antipolis Grand Château Parc Valrose Nice Cedex 2 France Centro Brasileiro de Pesquisas Físicas Rua Dr. Xavier Sigaud 150 Rio de Janeiro22290-180 Brazil Unit of Nonlinear Physics and Mathematical Modeling Università Campus Bio-Medico di Roma Via A. del Portillo 21 RomeI-00128 Italy ICRA Università Campus Bio-Medico di Roma Via A. del Portillo 21 RomeI-00128 Italy ASI Science Data Center Via del Politecnico s.n.c. RomeI-00133 Italy Dept. of Physical Sciences Earth and Environment University of Siena Via Roma 56 SienaI-53100 Italy ICRANet-Yerevan Marshall Baghramian Avenue 24a Yerevan0019 Armenia Department of Physics Isfahan University of Technology 84156-83111 Iran

ISBN: (纸本)9789813226593

Short and long-duration gamma-ray bursts (GRBs) have been recently sub-classified into seven families according to the binary nature of their progenitors. For short GRBs, mergers of neutron star binaries (NS-NS) or neutron star-black hole binaries (NS-BH) are proposed. For long GRBs, the induced gravitational collapse (IGC) paradigm proposes a tight binary system composed of a carbon-oxygen core (COcore) and a NS companion. The explosion of the COcore as supernova (SN) triggers a hypercritical accretion process onto the NS companion which might reach the critical mass for the gravitational collapse to a BH. Thus, this process can lead either to a NS-BH or to NS-NS depending on whether or not the accretion is sufficient to induce the collapse of the NS into a BH. We shall discuss for the above compact object binaries: (1) the role of the NS structure and the equation-of-state on their final fate;(2) their occurrence rates as inferred from the X and gamma-ray observations;(3) the expected number of detections of their gravitational wave (GW) emission by the Advanced LIGO interferometer. Copyright © 2018 by the *** rights reserved.

关键词： Gravitational effects

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The Transcutaneous Vagus Nerve Stimulation Output of the NuCalm Device of Solace Lifesciences Is Found to Be a Multifractal and Therefore It Is Indicated in the Treatment of Heart Rate Variability in the Dysfunction of Autonomic Nervous System in Anxiety, Depression and Stress

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Journal of Behavioral and Brain science 2017年第11期7卷 532-543页

作者： Sergio Conte Fang Wang Nicoletta Sala Francesco Losito Casciaro Franco Orsucci Giuseppe Serafini Ferda Kaleagasioglu Leonardo Mendolicchio Rich Norman Elio Conte School of Advanced International Studies on Applied Theoretical and Non Linear Methodologies of Physics Bari Italy College of Science/Agricultural Mathematical Modeling and Data Processing Center Hunan Agricultural University Changsha China University of Lugano ISSI/Cerfim Lugano Swizerland Department of Biomedical Sciences and Human Oncology University of Bari Bari Italy Division of Psychology University College London England Tor Vergata University Rome Italy Faculty of Medicine Near East University North Nicosia Turkish Republic of Northern Cyprus Clinic Villa Miralago ASL Varese Italy

We have investigated the Nu Calm Transcutaneous Vagus Nerve Stimulation device of the NuCalm Solace Lifesciences founding that it gives a multifractal output. A diminishing fractal/multifractal HRV is consistently reported in literature as related to a serious Autonomic Nervous System (ANS) dysfunction that of course we observe in several psychological and psychiatric disorders. Therefore, we suggest the investigators to apply such a device in subjects affected from anxiety, depression and stress using the method of inducing tVNS stimulation.

关键词： Depression Anxiety Stress Transcutaneous Vagus Nerve Stimulation Neuromodulation Heart Rate Variablity Multifractals

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Basic methods of change-point detection of financial fluctuations

Basic methods of change-point detection of financial fluctua...

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International Conference on Noise and Fluctuations (ICNF)

作者： Hideki Takayasu Graduate School of Advanced Mathematical Science MIMS Meiji Univ. Tokyo Japan Center for TDB-Advanced Data Analysis and Modeling Tokyo Institute of Technology Yokohama Japan Sony Computer Science Laboratories Tokyo Japan

Financial market time series are usually approximated by random walks, however, we can easily find significant deviation from a simple random walk by analyzing high frequency market data. It is important to detect change-points of potential statistical properties automatically from given time series. We apply Fisher's exact test for detection of trends in time series and show that the method works well for various types of temporal fluctuations. We show an example of application of this method for a foreign exchange market time series.

关键词： Noise Fluctuations Conferences

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