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arXiv 2024年

作者： Hirsbrunner, Mark R. Mullinax, J. Wayne Shen, Yizhi Williams-Young, David B. Klymko, Katherine Van Beeumen, Roel Tubman, Norm M. Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States USRA Research Institute for Advanced Computer Science Mountain ViewCA94043 United States KBR Inc. NASA Ames Research Center Moffett FieldCA94035 United States Intelligent Systems Division NASA Ames Research Center Moffett FieldCA94035 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Lab BerkeleyCA94720 United States NERSC Lawrence Berkeley National Lab BerkeleyCA94720 United States

Recent research has shown that wavefunction evolution in real- and imaginary-time can generate quantum subspaces with significant utility for obtaining accurate ground state energies. Inspired by these methods, we propose combining quantum subspace techniques with the variational quantum eigensolver (VQE). In our approach, the parameterized quantum circuit is divided into a series of smaller subcircuits. The sequential application of these subcircuits to an initial state generates a set of wavefunctions that we use as a quantum subspace to obtain high-accuracy groundstate energies. We call this technique the circuit subspace variational quantum eigensolver (CSVQE) algorithm. By benchmarking CSVQE on a range of quantum chemistry problems, we show that it can achieve significant error reduction in the best case compared to conventional VQE, particularly for poorly optimized circuits, greatly improving convergence rates. Furthermore, we demonstrate that when applied to circuits trapped at a local minima, CSVQE can produce energies close to the global minimum of the energy landscape, making it a potentially powerful tool for diagnosing local minima. © 2024, CC BY-NC-SA.

关键词： Ground state

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"Self-Wiener" filtering: Data-driven deconvolution of deterministic signals

arXiv

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arXiv 2020年

作者： Weiss, Amir Nadler, Boaz The Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States The Department of Computer Science and Applied Mathematics Faculty of Mathematics and Computer Science Weizmann Institute of Science 234 Herzl Street Rehovot7610001 Israel

We consider the problem of robust deconvolution, and particularly the recovery of an unknown deterministic signal convolved with a known filter and corrupted by additive noise. We present a novel, non-iterative data-driven approach. Specifically, our algorithm works in the frequency-domain, where it tries to mimic the optimal unrealizable non-linear Wiener-like filter as if the unknown deterministic signal were known. This leads to a threshold-type regularized estimator, where the threshold at each frequency is determined in a data-driven manner. We perform a theoretical analysis of our proposed estimator, and derive approximate formulas for its Mean Squared Error (MSE) at both low and high Signal-to-Noise Ratio (SNR) regimes. We show that in the low SNR regime our method provides enhanced noise suppression, and in the high SNR regime it approaches the optimal unrealizable solution. Further, as we demonstrate in simulations, our solution is highly suitable for (approximately) bandlimited or frequency-domain sparse signals, and provides a significant gain of several dBs relative to other methods in the resulting MSE. Copyright © 2020, The Authors. All rights reserved.

关键词： Mean square error

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On the Choice of Thresholding Parameters for Non-Gaussian Noise Distribution

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Journal of Mathematical sciences (United States) 2020年第4期246卷 519-524页

作者： Kudryavtsev, A.A. Shestakov, O.V. Department of Mathematical Statistics Faculty of Computational Mathematics and Cybernetics M. V. Lomonosov Moscow State University Moscow Russian Federation Institute of Informatics Problems Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences Moscow Russian Federation

The paper considers the problem of estimating the signal function from noisy observations using threshold processing of its wavelet expansion coefficients. Under general assumptions about the properties of the noise distribution, the asymptotic order of the optimal threshold is calculated, minimizing the loss function, based on the probability that the maximum error in the wavelet coefficients exceeds a given critical level. © 2020, Springer science+Business Media, LLC, part of Springer Nature.

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Adaptive Intelligent System for Monitoring and Control the Parameters of Pipelines Electrochemical Corrosion Protection

Adaptive Intelligent System for Monitoring and Control the P...

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2022 International Conference on Smart Information Systems and Technologies, SIST 2022

作者： Khussanov, Zhakhongir Prokhorov, Oleksandr Prokhorov, Valeriy Tevyashev, Andriy Turdybekova, Dilfuza Shatalov, Oleksii 'Structural And Biochemical Materials' M. Auezov South Kazakhstan University Regional Laboratory Of Engineering Shymkent Kazakhstan National Aerospace University 'Kharkiv Aviation Institute' Department Of Computer Science And Information Technologies Kharkiv Ukraine Natioanal University Of Radio Electronics Problematic Scientifically Adv. Lab. For Radio Monitoring And Proc. Of Radio Technical Information Kharkiv Ukraine National University Of Radio Electronics Department Of Applied Mathematics Kharkiv Ukraine M. Auezov South Kazakhstan University Shymkent Kazakhstan National University Of Radio Electronics Department Of Artificial Intelligence Kharkiv Ukraine

ISBN: (数字)9781665467902

ISBN: (纸本)9781665467902

The paper is dedicated to the creation of adaptive intelligent system that provides control and management of parameters of cathodic protection stations, taking into account changes in external conditions in some sections of pipelines. Multicriteria task of optimization of operation modes of cathodic protection stations is considered, as optimization is performed both by the criterion of optimality of protective potential distribution (uniformity of protective total potential distribution along the pipeline length) and by the criterion of minimum total protective current of stations. The system provides increase of reliability of electrochemical protection system as a whole and accordingly prevents possible emergencies at pipeline system, as well as reduces costs of current repair of pipelines, due to reliability and uninterrupted protection. © 2022 IEEE.

关键词： Adaptive control systems

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Exploring the Non-Thermal Effects of Electromagnetic Field on Biological Structures: Importance of Experimental Design and Measurement Conditions

SSRN

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SSRN 2023年

作者： Bajtos, Marek Carnecka, Lucia Dang, Nhat Gurhan, Hakki Pobocikova, Ivana Radil, Roman Janousek, Ladislav The Department of Electromagnetic and Biomedical Engineering Faculty of Electrical Engineering and Information Technology University of Zilina Univerzitna 8215 Zilina010 26 Slovakia The Department of Electrical Computer and Energy Engineering The University of Colorado Boulder BoulderCO80309 United States The Ann and H.J. Smead Department of Aerospace Engineering Sciences College of Engineering and Applied Science University of Colorado Boulder BoulderCO80309 United States The Department of Applied Mathematics Faculty of Mechanical Engineering University of Zilina Univerzitna 8215 Zilina010 26 Slovakia

This study delves into the non-thermal effects of electromagnetic fields (EMF) on living organisms, emphasizing experimental design, precise measurements, and simulation verification. Grounded in Ion Parametric Resonance theory, it investigates the interaction between time-varying EMF and the Earth's geomagnetic field. The research comprises experiments assessing the Earth's magnetic field at various locations using a magnetometer. These measurements reveal variations influenced by location and surrounding metallic elements. Complementary simulations confirm these measurements and assess high-permeability metal shielding's effectiveness in reducing geomagnetic field fluctuations within the experimental area. Crucial findings arise from experiments involving 50 Hz EMF exposure on Saccharomyces cerevisiae yeasts for seven hours. Statistical analysis supports the impact on yeast cells and identifies an optimal shielding setup for future low-frequency EMF experiments. This research provides valuable insights into EMF's effects on organisms, enhances experimental precision, and guides EMF exposure shielding strategies. © 2023, The Authors. All rights reserved.

关键词： Yeast

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Tunable phonon-driven magnon-magnon entanglement at room temperature

arXiv

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arXiv 2022年

作者： Liu, Yuefei Bergman, Anders Bagrov, Andrey Delin, Anna Thonig, Danny Pereiro, Manuel Eriksson, Olle Streib, Simon Sjöqvist, Erik Azimi-Mousolou, Vahid Department of Applied Physics School of Engineering Sciences KTH Royal Institute of Technology AlbaNova University Center StockholmSE-10691 Sweden Department of Physics and Astronomy Uppsala University Box 516 UppsalaSE-751 20 Sweden Institute for Molecules and Materials Radboud University Heyendaalseweg 135 Nijmegen6525AJ Netherlands KTH Royal Institute of Technology StockholmSE-10044 Sweden School of Science and Technology Örebro University ÖrebroSE-701 82 Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan81746-73441 Iran

We report the existence of entangled steady-states in bipartite quantum magnonic systems at elevated temperatures. We consider dissipative dynamics of two magnon modes in a bipartite antiferromagnet, subjected to interaction with a phonon mode and an external rotating magnetic field. To quantify the bipartite magnon-magnon entanglement, we use entanglement negativity and compute its dependence on temperature and magnetic field. We provide evidence that the coupling between magnon and phonon modes is necessary for the entanglement, and that, for any given phonon frequency and magnon-phonon coupling rate, there are always ranges of the magnetic field amplitudes and frequencies for which magnon-magnon entanglement persists at room temperature. Copyright © 2022, The Authors. All rights reserved.

关键词： Room temperature

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A new multi-criteria model for ranking chess players

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Procedia computer science 2021年 192卷 4290-4299页

作者： Aleksandra Kaczyńska Joanna Kołodziejczyk Wojciech Sałabun Research Team on Intelligent Decision Support Systems Department of Artificial Intelligence and Applied Mathematics Faculty of Computer Science and Information Technology West Pomeranian University of Technology in Szczecin ul. Żołnierska 49 71-210 Szczecin Poland

Chess is a very demanding sport as it requires advanced planning and strategic thinking skills. The degree of difficulty of the game also depends on the time allotted for a game, which can range from a few minutes to several tens of minutes. For this reason, the games are divided into several categories: standard, blitz, and bullet. However, as many chess players specialize in only some of the categories, it is difficult to determine the best chess player. It is very important to keep a proper ranking of the players. One way to recognize their achievements is the FIDE (Fédération Internationale des Échecs) titles awarded to the best players. However, there is still the problem of how to determine the best among the Grandmasters. There are many very talented players competing in chess. Creating a single ranking for all types of chess, regardless of the time allotted for the game, is a difficult challenge, as many undeniably outstanding chess players do not specialize in all types. Creating a ranking for only one type would not accurately describe the level of players. Therefore, a ranking was created based on all of them using the COMET method, which belongs to the multi-criteria decision-making methods (MCDA). It is based on fuzzy logic and uses characteristic objects for the assessment of alternatives, which guarantees immunity to the paradox of reversal rankings. Expert opinion was used for correct evaluation. This article presents the ranking of chess players regardless of the type of game they specialize in, to prove that it should be possible to identify the single best chess player.

关键词： Chess MCDA COMET players evaluation decision making

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How strongly do rank similarity coefficients differ used in decision making problems?

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Procedia computer science 2021年 192卷 4570-4577页

作者： Andrii Shekhovtsov Research Team on Intelligent Decision Support Systems Department of Artificial Intelligence and Applied Mathematics Faculty of Computer Science and Information Technology West Pomeranian University of Technology in Szczecin ul. Żołnierska 49 71-210 Szczecin Poland

It is common practice in the MCDA to use several multi-criteria decision methods and then compares obtained rankings with one or two different rank correlation coefficients. The problem is that different rank correlation coefficient gives different values for the same pair of rankings, and the number of studies which tries to investigate it is small. Studying the similarity of rankings is a very important challenge in multi-criteria decision support, and the coefficients themselves seem to be the most practical ways of evaluating rankings. This paper compares chosen rank correlation coefficients to show how much different they are. Spearman’s, Weighted Spearman’s, Kendall Tau and Rank similarity correlation coefficient are compared statistically. The paper confirms that the coefficients are closely related, and their dependence is graphically represented, which initiates research towards allows for their better selection in the future. In conclusions, directions of further development are indicated.

关键词： MCDA ranking rank correlation

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A fuzzy assessment model for freestyle swimmers - a comparative analysis of the MCDA methods

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Procedia computer science 2021年 192卷 4148-4157页

作者： Jakub Więckowski Larisa Dobryakova Research Team on Intelligent Decision Support Systems Department of Artificial Intelligence and Applied Mathematics Faculty of Computer Science and Information Technology West Pomeranian University of Technology in Szczecin ul.Żołnierska 49 71-210 Szczecin Poland

Multi-Criteria Decision Analysis methods are readily used in decision support models. However, many methods in this group of methods cause a problem with choosing an appropriate method for a given problem. One of such methods is COMET (Characteristic Objects Method), which compares pairs of Characteristic Objects (COs) when calculating preference values of alternatives. In this paper, the COMET method was used to create a model that evaluates swimming athletes regarding their predisposition to compete in freestyle sprint events. Besides, to reduce the complexity of the problem, a division of the initial structure was applied, which made it possible to reduce the number of comparisons to 0.7e -8 % of their initial number. To verify the obtained results, it was decided to use selected MCDA methods to solve the same problem. The correlation between the rankings was examined using the Pearson correlation coefficient and the WS similarity coefficient. Based on the results obtained, it can be concluded that the proposed model gives results that guarantee a high correlation with the results from the other methods. Moreover, it can be useful in evaluating and selecting swimming athletes for participation in given events.

关键词： Sport management COMET MCDA Swimming

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Comparative study on atomic ionization in bicircular laser fields by length and velocity gauges S-matrix theory

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Chinese Physics B 2020年第2期29卷 254-261页

作者： Hong Xia Xin-Yan Jia Xiao-Lei Hao Li Guo Dai-He Fan Gen-Bai Chu Jing Chen School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China Institute of Theoretical Physics and Department of Physics Shanxi UniversityTaiyuan 030006China State Key Laboratory for Quantum Optics and Center for Cold Atom Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterChina Academy of Engineering PhysicsMianyang 621900China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Ionization of atoms in counter-rotating and co-rotating bicircular laser fields is studied using the S-matrix theory in both length and velocity *** show that for both the bicircular fields,ionization rates are enhanced when the two circularly polarized lights have comparable *** addition,the curves of ionization rate versus the field amplitude ratio of the two colors for counter-rotating and co-rotating fields coincide with each other in the length gauge case at the total laser intensity 5×10^14 W/cm^2,which agrees with the experimental ***,the degree of the coincidence between the ionization rate curves of the two bicircular fields decreases with the increasing field amplitude ratio and decreasing total laser *** the help of the ADK theory,the above characteristics of the ionization rate curves can be well interpreted,which is related to the transition from the tunneling to multiphoton ionization mechanism.

关键词： above-threshold ionization(ATI) bicircular laser fields length gauge velocity gauge S-matrix theory

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