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IEEE International Conference on Systems, Man and Cybernetics

作者： Roman Senkerik Aleksander Byrski Hubert Guzowski Peter Janku Tomas Kadavy Zuzana Kominkova Oplatkova Radek Matusu Michal Pluhacek Libor Pekar Maciej Smolka Adam Viktorin Department of Informatics and Artificial Intelligence A.I. Lab Faculty of Applied Informatics Tomas Bata University in Zlin Czech Republic Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlin Czech Republic Institute of Computer Science AGH University of Science and Technology Krakow Poland

This paper presents an experimental study that compares the performance of four selected metaheuristic algorithms for optimizing a time delay system model. Time delay system models are complex and challenging to optimize due to their inherent characteristics, such as non-linearity, multi-modality, and constraints. The study includes an explanation of the choice and core functionality of the selected algorithms, which are both baseline and state-of-the-art variants of self-organizing migrating algorithm (SOMA), state-of-the-art variant from the Success-History-based Adaptive Differential Evolution family of algorithms, with emphasis on diverse search (DISH algorithm), and Covariance Matrix Adaptation Evolution Strategy (CMA-ES) algorithm. The hyperparameters of the metaheuristic algorithms were set using the iRace automatic algorithm configuration framework. The paper emphasizes the importance of metaheuristic algorithms in control engineering for time-delay systems to develop more effective and efficient control strategies and precise model identifications. The experimental results highlight the effectiveness of the state-of-the-art algorithms with specific adaptive mechanisms like population organization process, diverse search and adaptation mechanisms ensuring a gradual transition from exploration to exploitation. Overall, this study contributes to understanding the challenges and advantages of using metaheuristic algorithms in control engineering for time delay systems. The results provide valuable insights into the performance of modern metaheuristic algorithms and can help guide the selection of appropriate adaptive mechanisms of metaheuristics.

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Smart few-mode fiber multiplexer using multiplane light conversion

Smart few-mode fiber multiplexer using multiplane light conv...

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Pohle, Dennis Barbosa, Fabio A. Ferreira, Filipe M. Rothe, Stefan Czarske, Juergen W. Faculty of Electrical and Computer Engineering TU Dresden Dresden01069 Germany Optical Networks Group Department of Electronic and Electrical Engineering University College London WC1E 7JE United Kingdom Institute of Applied Physics School of Science TU Dresden Dresden01069 Germany

We propose a digital twin using multiplane light conversion and neural networks for a digitally programmable multiplexer for space division multiplexing. The new approach is promising for few-mode fiber communication.... 详细信息

ISBN: (纸本)9781957171296

关键词： Few mode fibers Fiber optic communications Neural networks Single mode fibers Space division multiplexing Spatial light modulators

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Higher order cumulants of transverse momentum and harmonic flow in relativistic heavy ion collisions

arXiv

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arXiv 2021年

作者： Bożek, Piotr Samanta, Rupam AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 Cracow30-059 Poland

Higher order symmetric cumulants of global collective observables in heavy ion collisions are studied. The symmetric cumulants can be straightforwardly constructed for scalar observables: the average transverse momentum, the multiplicity, and the squares of harmonic flow vectors. Third and fourth order cumulants are calculated in the hydrodynamic model. A linear predictor of the average transverse momentum and harmonic flow coefficients in a collision is used to predict the values of the cumulants from the moments of the initial distribution. The symmetric cumulants divided by the averages (or the standard deviations) of the considered observables can be used as a fine tool to study correlations present in the initial state of the collision. © 2021, CC BY.

关键词： Heavy ions

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Local Universal Explainer (LUX) – a rule-based explainer with factual, counterfactual and visual explanations

arXiv

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arXiv 2023年

作者： Bobek, Szymon Nalepa, Grzegorz J. Faculty of Physics Astronomy and Applied Computer Science Institute of Applied Computer Science Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research ul. prof. Stanislawa Lojasiewicza 11 Krakow30-348 Poland

Explainable artificial intelligence (XAI) is one of the most intensively developed area of AI in recent years. It is also one of the most fragmented with multiple methods that focus on different aspects of explanations. This makes difficult to obtain the full spectrum of explanation at once in a compact and consistent way. To address this issue, we present Local Universal Explainer (LUX), which is a rule-based explainer that can generate factual, counterfactual and visual explanations. It is based on a modified version of decision tree algorithms that allows for oblique splits and integration with feature importance XAI methods such as *** limits the use data generation in opposite to other algorithms, but is focused on selecting local concepts in a form of high-density clusters of real data that have the highest impact on forming the decision boundary of the explained model and generating artificial samples with novel SHAP-guided sampling algorithm. We tested our method on real and synthetic datasets and compared it with state-of-the-art rule-based explainers such as LORE, EXPLAN and Anchor. Our method outperforms the existing approaches in terms of simplicity, fidelity, representativeness, and consistency. Copyright © 2023, The Authors. All rights reserved.

关键词： Decision trees

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Electron and neutrino scattering off the deuteron in a relativistic framework

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Physical Review C 2023年第2期107卷 024617-024617页

作者： A. Grassi J. Golak W. N. Polyzou R. Skibiński H. Witała H. Kamada M. Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University PL-30348 Kraków Poland Department of Physics and Astronomy The University of Iowa Iowa City Iowa 52242 USA Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan

We build a relativistic model to perform calculations of exclusive, semiexclusive, and inclusive unpolarized cross sections and various polarization observables in electron and neutrino scattering experiments with deuteron targets. The strong interaction dynamics is defined by an explicit dynamical unitary representation of the Poincaré group, where representations of space translations and rotations in the interacting and noninteracting representations are the same. The Argonne V18 potential is used to construct a relativistic nucleon-nucleon interaction reproducing the experimental deuteron binding energy and nucleon-nucleon scattering observables. Our formalism does not include the pion production channel and neglects two-body contributions in the electromagnetic as well as in the weak nuclear current operator. We show that it is applicable to processes at kinematics, where the internal two-nucleon energy remains below the pion production threshold but the magnitude of the three-momentum transfer extends at least to several GeV.

关键词： Electroweak interactions in nuclear physics Nuclear reactions Polarization phenomena Special relativity Few-body systems

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Negative result about the construction of genuinely entangled subspaces from unextendible product bases

arXiv

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arXiv 2022年

作者： Demianowicz, Maciej Institute of Physics and Applied Computer Science Faculty of Applied Physics and Mathematics Gdansk University of Technology Narutowicza 11/12 Gdansk80-233 Poland

Unextendible product bases (UPBs) provide a versatile tool with various applications across different areas of quantum information theory. Their comprehensive characterization is thus of great importance and has been a subject of vital interest for over two decades now. An open question asks about the existence of UPBs, which are genuinely unextendible, i.e., they are not extendible even with biproduct vectors. In other words, the problem is to verify whether there exist genuinely entangled subspaces (GESs), subspaces composed solely of genuinely multiparty entangled states, complementary to UPBs. We solve this problem in the negative for many sizes of UPBs in different multipartite scenarios. In particular, in the all-important case of equal local dimensions, we show that there are always forbidden cardinalities for such UPBs, including the minimal ones corresponding to GESs of the maximal dimensions. Copyright © 2022, The Authors. All rights reserved.

关键词： Vectors

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Mrs. Correct and majority colorings

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Discrete Mathematics 2025年第11期348卷

作者： Anholcer, Marcin Bosek, Bartłomiej Grytczuk, Jarosław Gutowski, Grzegorz Przybyło, Jakub Zając, Mariusz Institute of Informatics and Quantitative Economics Poznań University of Economics and Business Poznań Poland Institute of Theoretical Computer Science Faculty of Mathematics and Computer Science Jagiellonian University Kraków Poland Faculty of Mathematics and Information Science Warsaw University of Technology Warsaw Poland AGH University of Krakow Faculty of Applied Mathematics al. A. Mickiewicza 30 Kraków 30-059 Poland

A majority coloring of a directed graph is a vertex coloring in which each vertex has the same color as at most half of its out-neighbors. In this note we simplify some proof techniques and generalize previously known results on various generalizations of majority coloring. In particular, our unified and simplified approach works for paintability – an on-line analog of the list coloring. © 2025 The Author(s)

关键词： List coloring Majority coloring Paintability

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Electronic structure, electron-phonon coupling and superconductivity in noncentrosymmetric ThCoC2 from ab initio calculations

arXiv

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arXiv 2021年

作者： Kuderowicz, Gabriel Wójcik, Pawel Wiendlocha, Bartlomiej Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 Krakow30-059 Poland

Superconductors without inversion symmetry in their crystal structure are known to exhibit unconventional properties. Recently, based on the measured temperature dependence of the magnetic field penetration depth, superconductivity in noncentrosymmetric ThCoC2 was proposed to be a nodal d-wave and mediated by the spin fluctuations. Moreover, a non-BCS behavior of the temperature dependence of the electronic specific heat and the magnetic upper critical field were reported. In this work, the electronic structure, phonons and electron-phonon coupling are studied in ThCoC2 on the basis of ab initio computations. The effect of the spin-orbit coupling on the electronic structure and electron-phonon interaction is analyzed, and a large splitting of the electronic band structure is found. The calculated electron-phonon coupling constant λ = 0.59 remains in decent agreement with the experimental estimates, suggesting that the electron-phonon interaction is strong enough to explain superconductivity with Tc 2.5 K. Nevertheless, we show that the conventional isotropic Eliashberg formalism is unable to describe the thermodynamic properties of the superconducting state, as calculated temperature dependence of the electronic specific heat and magnetic penetration depth deviate from experiments, which is likely driven by the strong spin-orbit coupling and inversion symmetry breaking. In addition, to shed more light on the pairing mechanism, we propose to measure the carbon isotope effect, as our calculations based on the electron-phonon coupling predict the observation of the isotope effect with an exponent α 0.15. Copyright © 2021, The Authors. All rights reserved.

关键词： Electron-phonon interactions

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Approximate method for helical particle trajectory reconstruction in high energy physics experiments

arXiv

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arXiv 2022年

作者： Topolnicki, Kacper Bold, T. M. Smoluchowski Institute of Physics Jagiellonian University Kraków30-348 Poland Agh University of Science and Technology Dept. of Physics and Applied Computer Science Krakow Poland

High energy physics experiments, in particular experiments at the LHC, require the reconstruction of charged particle trajectories. Methods of reconstructing such trajectories have been known for decades, yet the applications at High Luminosity LHC require this reconstruction to be fast enough to be suitable for online event filtering. A particle traversing the detector volume leaves signals in active detector elements from which the trajectory is reconstructed. If the detector is submerged in a uniform magnetic field that trajectory is approximately helical. Since a collision event results in the production of many particles, especially at high luminosities, the first phase of trajectory reconstruction is the formation of candidate trajectories composed of a small subset of detector measurements that are then subject of resource intensive precise track parameters estimation. In this paper, we suggest a new approach that could be used to perform this classification. The proposed procedure utilizes the z coordinate in the longitudinal direction in addition to the x, y coordinates in the plane perpendicular to the direction of the magnetic field. The suggested algorithm works equally well for helical trajectories with different proximities to the beamline which is beneficial when searching for products of particles with longer lifetimes. Copyright © 2022, The Authors. All rights reserved.

关键词： Luminance

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Discrete dynamics in the set of quantum measurements

arXiv

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arXiv 2023年

作者： Rico, Albert Zyczkowski, Karol Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University Kraków30-348 Poland Center for Theoretical Physics Polish Academy of Sciences Warszawa02-668 Poland

A quantum measurement, often referred to as positive operator-valued measurement (POVM), is a set of positive operators Pj = Pj† ≥ 0 summing to identity, Pj Pj = 1. This can be seen as a generalization of a probability distribution of positive real numbers summing to unity, whose evolution is given by a stochastic matrix. We describe transformations in the set of quantum measurements induced by blockwise stochastic matrices, composed of positive blocks that sum columnwise to identity, using the notion of sequential product of matrices. We show that such transformations correspond to a sequence of quantum measurements. Imposing additionally the dual condition that the sum of blocks in each row is equal to identity we arrive at blockwise bistochastic matrices (also called quantum magic squares). Analyzing their dynamical properties, we formulate our main result: a quantum analog of the Ostrowski description of the classical Birkhoff polytope, which introduces the notion of majorization between quantum measurements. Our framework provides a dynamical characterization of the set of blockwise bistochastic matrices and establishes a resource theory in the set of quantum measurements. Copyright © 2023, The Authors. All rights reserved.

关键词： Probability distributions

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