30,260 research outputs found
Нейронні звичайні диференціальні рівняння для реконструкції часових рядів
No full textAndrosov D. V. Neural ordinary differential equations for time series reconstruction / D. V. Androsov // Радіоелектроніка, інформатика, управління. – 2023. – № 4 (67). – C. 69-75.EN: Context. Neural Ordinary Differential Equations is a deep neural networks family that leverage numerical methods approaches for solving the problem of time series reconstruction, given small amount of unevenly distributed samples.
Objective. The goal of the following research is the synthesis of a deep neural network that is able to solve input signal reconstruction and time series extrapolation task.
Method. The proposed method exhibits the benefits of solving time series extrapolation task over forecasting one. A model that implements encoder-decoder architecture with differential equation solving in latent space, is proposed. The latter approach was proven to demonstrate outstanding performance in solving time series reconstruction task given a small percentage of noisy and uneven distributed input signals. The proposed Latent Ordinary Differential Equations Variational Autoencoder (LODE-VAE) model was benchmarked on synthetic non-stationary data with added white noise and randomly sampled with random intervals between each signal.
Results. The proposed method was implemented via deep neural network to solve time series extrapolation task.
Conclusions. The conducted experiments have confirmed that proposed model solves the given task effectively and is recommended to apply it to solving real-world problems that require reconstructing dynamics of non-stationary processes. The prospects for further research may include the process of computational optimization of proposed models, as well as conducting additional experiments involving different baselines, e. g. Generative Adversarial Networks or attention Networks.
UK: Актуальність. Розглянуто задачу реконструкції нестаціонарних часових рядів на основі моделей кодувальник-декодувальник за допомогою нейронних звичайних диференціальних рівнянь. Об’єктом дослідження є задача відновлення та прогнозування нестаціонарних часовиї рядів та процесів в неперевному часі. Мета роботи – синтез моделі на основі архітектури кодувальник-декодувальник та з використанням моделей типу нейронних звичайних диференційних рівнянь для реконструкції часових рядів по зашумленими, нерівномірно розподіленими у час, вхідними сигналами.
Метод. Запропоновано метод, що реалізує архітектуру кодувальника-декодувальника та аппарат штучних нейронних мереж з розв’язанням диференціальних рівнянь у латентному просторі. Було встановлено, що даний підхід демонструє високу ефективність та якість прогнозів при вирішенні задачі реконструкції часових рядів по зашумленим вхідним сигналам з випадковими інтервалами між сигналами. Запропонована модель варіаційного автокодувальника на з використанням апарату нейронних мереж була протестована на синтетичних нестаціонарних даних з додаваням білим шумом і семплінгом з випадковими інтервалами між кожним сигналом.
Результати. Розроблені показники реалізовані програмно і досліджені при вирішенні задачі реконструкції нестацонарного ряду з сезонністю.
Висновки. Проведені експерименти підтвердили, що запропонована модель ефективно вирішує задану задачу і рекомендується застосовувати її для вирішення реальних завдань, що вимагають реконструкції динаміки нестаціонарних процесів. Перспективи включають в себе подальші дослідження різних архітектур нейронних мереж, окрім рекурентних нейронних мереж та архітектур автокодувальників. Зокрема пропонується використовувати інші підходи генеративного нейромережевого моделювання, як генеративно-змагальні мережі у контексті відновлення структури часового ряд
Water Mass Transport Changes through the Venice Lagoon Inlets from Projected Sea-Level Changes under a Climate Warming Scenario
No full textIn this study, an ensemble of numerical simulations with a state-of-the-art hydrodynamic model for coastal applications is used to characterize, for the first time, the expected mid-21st-century changes in circulation and associated sea-level height inside the Venice lagoon induced by projected Mediterranean sea level rise and atmospheric circulation changes over the Adriatic Sea under the RCP8.5 emission scenario. Our results show that water transports through the three inlets connecting the Venice lagoon to the open sea are expected to change significantly, with consequent significant persistent alterations of the circulation and sea-level height inside the lagoon. The projected water mass redistributions motivate further studies on the implications of climate change for the lagoon environment
Dynamics of finite-sized light spheres in turbulence
No full textWe report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (ReY) is varied from 180 to 300, and the study covers a range of size ratios (4 < D/η < 16) for marginally light spheres. We find that the normalised acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model. We also present preliminary results on the rotational dynamics of large light spheres in turbulence
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
1ST MEASUREMENT OF GAMMA(D(S)(+)-]MU+NU)/GAMMA(D(S)(+)-]PHI-PI+)
No full textComplete Author List:
ACOSTA D, ATHANAS M, MASEK G, PAAR H, BEAN A, GRONBERG J, KUTSCHKE R, MENARY S, MORRISON RJ, NAKANISHI S, NELSON HN, NELSON TK, RICHMAN JD, RYD A, TAJIMA H, SCHMIDT D, SPERKA D, WITHERELL MS, PROCARIO M, YANG S, BALEST R, CHO K, DAOUDI M, FORD WT, JOHNSON DR, LINGEL K, LOHNER M, RANKIN P, SMITH JG, ALEXANDER JP, BEBEK C, BERKELMAN K, BESSON D, BROWDER TE, CASSEL DG, CHO HA, COFFMAN DM, DRELL PS, EHRLICH R, GALIK RS, GARCIASCIVERES M, GEISER B, GITTELMAN B, GRAY SW, HARTILL DL, HELTSLEY BK, JONES CD, JONES SL, KANDASWAMY J, KATAYAMA N, KIM PC, KREINICK DL, LUDWIG GS, MASUI J, MEVISSEN J, MISTRY NB, NG CR, NORDBERG E, OGG M, PATTERSON JR, PETERSON D, RILEY D, SALMAN S, SAPPER M, WORDEN H, WURTHWEIN F, AVERY P, FREYBERGER A, RODRIGUEZ J, STEPHENS R, YELTON J, CINABRO D, HENDERSON S, KINOSHITA K, LIU T, SAULNIER M, SHEN F, WILSON R, YAMAMOTO H, ONG B, SELEN M, SADOFF AJ, AMMAR R, BALL S, BARINGER P, COPPAGE D, COPTY N, DAVIS R, HANCOCK N, KELLY M, KWAK N, LAM H, KUBOTA Y, LATTERY M, NELSON JK, PATTON S, PERTICONE D, POLING R, SAVINOV V, SCHRENK S, WANG R, ALAM MS, KIM IJ, NEMATI B, ONEILL JJ, SEVERINI H, SUN CR, ZOELLER MM, CRAWFORD G, DAUBENMIER CM, FULTON R, FUJINO D, GAN KK, HONSCHEID K, KAGAN H, KASS R, LEE J, MALCHOW R, MORROW F, SKOVPEN Y, SUNG M, WHITE C, WHITMORE J, WILSON P, BUTLER F, FU X, KALBFLEISCH G, LAMBRECHT M, ROSS WR, SKUBIC P, SNOW J, WANG PL, WOOD M, BORTOLETTO D, BROWN DN, FAST J, MCILWAIN RL, MIAO T, MILLER DH, MODESITT M, SCHAFFNER SF, SHIBATA EI, SHIPSEY IPJ, WANG PN, BATTLE M, ERNST J, KROHA H, ROBERTS S, SPARKS K, THORNDIKE EH, WANG CH, DOMINICK J, SANGHERA S, SHELKOV V, SKWARNICKI T, STROYNOWSKI R, VOLOBOUEV I, ZADOROZHNY P, ARTUSO M, HE D, GOLDBERG M, HORWITZ N, KENNETT R, MONETI GC, MUHEIM F, MUKHIN Y, PLAYFER S, ROZEN Y, STONE S, THULASIDAS M, VASSEUR G, ZHU G, BARTELT J, CSORNA SE, EGYED Z, JAIN V, SHELDON P, AKERIB DS, BARISH B, CHADHA M, CHAN S, COWEN DF, EIGEN G, MILLER JS, OGRADY C, URHEIM J, WEINSTEIN A
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
No full textThe asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 K_S pi+ decay is negligible. No significant dependence on \eta or p_T is observed
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
A matrix characterization for the D-v-semiclassical and D-v-coherent orthogonal polynomials
No full textWe present a new structure relation for the sequence of orthogonal polynomials associated with a D-v-semiclassical linear functional of class s, and then we use it to obtain a matrix characterization of the D-v-semiclassical orthogonal polynomials in terms of the Jacobi matrix associated with the multiplication operator in the basis of orthonormal polynomials, and the nonsingular lower triangular matrix that represents the orthogonal polynomials with respect to some bases of polynomials. We also provide a matrix characterization of D-v-coherent pairs of linear functionals.The work of the first author was supported by a grant of the Secretar´ıa de
Educaci´on P´ublica of M´exico and the Mexican Government. The work of the
second author was supported by Consejo Nacional de Ciencia y Tecnolog´ıa of
M´exico, grant 156668. The work of the third author was supported by Direcci
´on General de Investigaci´on Cient´ıfica y T´ecnica, Ministerio de Econom´ıa y
Competitividad of Spain, grant MTM2012-36732-C03-01. The authors thank
the anonymous referee for her/his valuable comments and suggestions. They
contributed to improve the presentation of the manuscript
Dvouúrovňová hra v kontextu životního prostředí: Postavení ruské federace v mezinárodních klimatických jednáních
No full textPříspěvek pojednává o ruské environmentální politice s využitím teorie dvouúrovňové hry, kterou v roce 1988 představil Robert D. Putnаm v článku „Diplomacy and Domestiс Politiсs: The Logiс of Two-Level Gаmes“. S pomocí zmíněné teorie jsou na mezinárodní i domácí úrovni zkoumány dvě mezinárodní smlouvy týkající se problematiky klimatu: Kjótský protokol a Pařížská dohoda. Autorka se pokouší definovat charakter a velikost tzv. win-setů které každé z jednání přineslo Rusku, na základě těchto informací je možné provést srovnání výhod každé ze smluv. Příspěvek také ukazuje vývoj ruské environmentální politiky, protože zvolené časové období pokrývá přibližně 20 let historie moderního Ruska. Autor odkrývá místo klimatické agendy v ruské mezinárodní a domácí politice.The paper deals with the Russian environmental politics, using the theory of the Two-Level Game, presented by Robert D. Putnаm in 1988 in the article “Diplomасy аnd Domestiс Politiсs: The Logiс of Two-Level Gаmes”. With the help of the mentioned theory two international treaties regarding climate issue: the Kyoto Protocol and the Paris Agreement are examined on the international as well as on the domestic level. The author tries to define the character and the size of the so-called win-sets that each of the negotiation brought to Russia, based on this information the comparison of the benefits of each of the treaty is possible to be done. The paper also shows the development of the Russian environmental policy as the chosen period of time covers around 20 years of the history of modern Russia. The author uncovers the place of the climate agenda in the Russian international and domestic policy
Philosophical heritage of D. V. Pivovarov: vectors of religious spirituality
No full textThe relevance of the study of D. V. Pivovarov’s philosophical heritage, his proposed approach to understanding religious spirituality, the developed concept of forms of religion and religiosity (cosmocentrism, egocentrism, sociocentrism) is related to the fact that today Russia is in search of that spiritual foundation that could unite all Russians.
The purpose of the article is to show the methodological possibilities of applying D. V. Pivovarov’s concept to comprehend the phenomenon of «new spirituality» expressed through such concepts introduced by modern Russian legal acts: «Russian nation», «all-Russian civil identity», «common cultural (civilizational) code of the Russian people».
To describe the approach of D.V. Pivovarov, the principles of system analysis are used, which allows us to evaluate the contribution of an outstanding Ural scientist to Russian religious studies; the judgments and conclusions of the author of the concept are used as methodological guidelines for the analysis of the phenomenon of «new spirituality».
As a result of the study, the authors came to the conclusion that it is possible to interpret the phenomenon of «new spirituality» as an attempt to create such a «solid core» of sacred values of the unified Russian culture, which will ensure the non-conflict coexistence of the ideals of cosmocentrism, sociocentrism and egocentrism.
The practical significance is seen in the fact that, being an important methodological tool, the approach proposed by D. V. Pivovarov will find application in the study and explanation of new religious ideas and spiritual practices adequate to the needs of the time, in the teaching of historical and religious studies courses, in assessing the effectiveness of mechanisms for strengthening Russian identity
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