检索结果-内蒙古大学图书馆

Robust Feature Engineering Techniques for Designing Efficient Motor Imagery-Based BCI-Systems

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Gardezi, Syed Saim Jawed, Soyiba Khan, Mahnoor Bukhari, Muneeba Khan, Rizwan Ahmed Department of Biomedical Engineering Faculty of Engineering Salim Habib University Karachi Pakistan Department of Computer Software Engineering College of Electrical and Mechanical Engineering NUST Islamabad Pakistan Department of Physics Faculty of Applied Sciences Riphah International University Islamabad Pakistan Department of Biomedical Engineering Faculty of Engineering NED University Karachi Pakistan Department of Computer Science School of Mathematics and Computer Science Institute of Business Administration Karachi Pakistan

A multitude of individuals across the globe grapple with motor disabilities. Neural prosthetics utilizing Brain-computer Interface (BCI) technology exhibit promise for improving motor rehabilitation outcomes. The intricate nature of EEG data poses a significant hurdle for current BCI systems. Recently, a qualitative repository of EEG signals tied to both upper and lower limb execution of motor and motor imagery tasks has been unveiled. Despite this, the productivity of the Machine Learning (ML) Models that were trained on this dataset was alarmingly deficient, and the evaluation framework seemed insufficient. To enhance outcomes, robust feature engineering (signal processing) methodologies are implemented. A collection of time domain, frequency domain, and wavelet-derived features was obtained from 16-channel EEG signals, and the Maximum Relevance Minimum Redundancy (MRMR) approach was employed to identify the four most significant features. For classification K Nearest Neighbors, Support Vector Machine, Decision Tree, and Naïve Bayes models were implemented with these selected features, evaluating their effectiveness through metrics such as testing accuracy, precision, recall, and F1 Score. By leveraging SVM with a Gaussian Kernel, a remarkable maximum testing accuracy of 92.50% for motor activities and 95.48% for imagery activities is achieved. These results are notably more dependable and gratifying compared to the previous study, where the peak accuracy was recorded at 74.36%. This research work provides an in-depth analysis of the MI Limb EEG dataset and it will help in designing and developing simple, cost-effective and reliable BCI systems for neuro-rehabilitation. © 2024, CC BY-NC-ND.

关键词： Support vector machines

Discrete Imprecise Copulas

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Košir, Tomaž Perrone, Elisa Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 Ljubljana1000 Slovenia Department of Mathematics and Computer Science Eindhoven University of Technology Groene Loper 5 Eindhoven5612 AZ Netherlands

In this paper, we study discrete quasi-copulas associated with imprecise copulas. We focus on discrete imprecise copulas that are in correspondence with the Alternating Sign Matrices and provide some construction techniques of dual pairs. Additionally, we show how to obtain (full-domain) self-dual imprecise copulas through patchwork techniques. We further investigate the properties of the constructed dual pairs and prove that they are coherent and avoiding sure *** Codes 62H05, 52B99 Copyright © 2024, The Authors. All rights reserved.

关键词： Matrix algebra

Synthesis, structural characterization, and magnetic properties of La3+- and Bi3+-Doped Co–Ni–Zn–Cu ferrite nanoparticles

学校读者我要写书评

暂无评论

Ceramics International 2025年

作者： Almousawi, Mohammad Aridi, Amani El Sayed, Malak Yasser Abdallah, Alaa Labban, Wafic Habchi, Roland Awad, Ramadan EC2M Faculty of Sciences Campus Pierre Gemayel – Fanar Lebanese University 90656 Lebanon Public Health Department Faculty of Health Sciences Modern University for Business and Science Beirut Lebanon Department of Physics Faculty of Science Beirut Arab University Beirut Lebanon Functional Materials Group Gulf University for Science and Technology Hawally32093 Kuwait Department of Physics Faculty of Science Alexandria University Alexandria21511 Egypt Department of Basic Sciences Faculty of Computer Science and Artificial Intelligence Pharos University in Alexandria Alexandria Egypt

In this study, the synthesis and characterization of new nanoferrites were performed. The structural, morphological and magnetic properties of these materials were enhanced by Fe-site doping. Spinel ferrite nanoparticles with the composition Co0.3Ni0.3Zn0.2Cu0.2Fe2O4 along with codoped variants Co0.3Ni0.3Zn0.2Cu0.2Fe1.8La0.2−xBixO4 (where x = 0, 0.02, 0.04, 0.08, and 0.12) were synthesized by the coprecipitation method. A comprehensive investigation of their structural, morphological, and magnetic properties was conducted. X-ray diffraction (XRD) confirmed the formation of a cubic spinel structure with a minor hematite phase, which decreased with La3+ and Bi3+. A reduction in crystallite size from 16.69 to 6.67 nm was observed with increasing x from 0 to 0.12. Furthermore, the lattice parameter increased from 8.343 Å in the pure sample to 8.355 Å in the Bi0.12 sample. X-ray photoelectron spectroscopy (XPS) confirmed the oxidation states of constituent elements and indicated that La3+ and Bi3+ occupy the octahedral sites. The presence of two bands in the Fourier-transform infrared spectroscopy spectra within the ranges of 500–600 and 385–450 cm−1 indicated the formation of the spinel structure. Energy-dispersive X-ray (EDX) results confirmed that the actual composition of the constituent elements matches closely with the theoretical one. The particle size and lattice parameter, determined through transmission electron microscopy and selected area electron diffraction, were consistent with those obtained from XRD. Magnetic measurements showed a notable reduction in saturation magnetization, coercivity, and remanent magnetization upon codoping ferrite nanoparticles. Codoping with La3+ and Bi3+ ions considerably increased the superparamagnetic contribution from 1.27 % to 66.96 % and the paramagnetic contribution from 6.22 % to 32.65 % while reducing the ferromagnetic contribution from 92.51 % to 0.39 %. These results suggest that the nanoparticles can be used in magneti

关键词： Fourier transform infrared spectroscopy

Optical Coherence Tomography Classification Based on Transfer Learning and RA-Attention 11th

学校读者我要写书评

暂无评论

Optical Coherence Tomography Classification Based on Transfe...

11th International Conference on Health Information science, HIS 2022

作者： Lian, Xiaoyi Chen, Lina Ji, Xiayan Shen, Fangyao Guo, Hongjie Gao, Hong College of Physics and Electronic Information Engineering Zhejiang Normal University Zhejiang321004 China College of Mathematics and Computer Science Zhejiang Normal University Zhejiang321004 China Faculty of Computing Harbin Institute of Technology Harbin150001 China

ISBN: (纸本)9783031206269

Macular disease is one of the major causes of blindness. Optical coherence tomography (OCT) is a commonly used ophthalmic diagnostic technique to assist ophthalmologists in their analysis and treatment. However, manual analysis is a time-consuming, heavy and subjective process. In this paper, we propose an improved EfficientNet model for retinal OCT image classification, named TL-RA-EfficientNet. It introduces a Re-Attention module to enable the model to identify the lesions with small areas and fuzzy shapes. During training, a data augmentation strategy is introduced to solve the class-imbalance problem, and a transfer learning strategy is adopted to speed up the convergence of the model. The experimental results on the UCSD dataset show that the average recognition accuracy, sensitivity and specificity of our model are 99.9%, 99.9% and 99.97%, respectively, which are more effective than previous classification methods. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Optical tomography

A VNS Approach for Batch Sequencing and Route Planning in Manual Picking System with Time Windows 1

学校读者我要写书评

暂无评论

7th International Conference on Variable Neighborhood Search, ICVNS 2019

作者： Duda, Jerzy Stawowy, Adam Department of Applied Computer Science Faculty of Management AGH University of Science and Technology Gramatyka St. 10 Krakow30-067 Poland

ISBN: (数字)9783030449322

ISBN: (纸本)9783030449315

In this paper an order picking and route planning problem is studied. The main objective is to minimize the number of pickers involved in collecting the order pool and the total distance covered by the pickers. Since the problem under study is NP-hard, a variable neighborhood search (VNS) is proposed as a heuristic solution approach. Neighborhood is changed according to VNS scheme employing four tailored structures. Finally, computational tests demonstrate that the proposed VNS algorithm can find good quality solutions for all practical problems examined. The objective values, regarding both the number of pickers employed and the total distance covered by them, are better than the results of genetic algorithm and close to the ones obtained by CPLEX Solver, if it was able to provide a feasible solution. © 2020, Springer Nature Switzerland AG.

关键词： Genetic algorithms

Formation of Metastable Solid Solutions in Bi – Ge Films at Low-Temperature Treatment

学校读者我要写书评

暂无评论

SSRN

SSRN 2024年

作者： Bogatyrenko, Sergiy Kryshtal, Pavlo Gruszczyński, Adam Kryshtal, Aleksandr Department of Physics and Technology V.N. Karazin Kharkiv National University 4 Svobody sq. Kharkiv61022 Ukraine Faculty of Metals Engineering and Industrial Computer Science AGH University of Krakow Al. A. Mickiewicza 30 KrakówPL-30 059 Poland

AbstractWe investigated the mechanism and kinetics of formation of metastable BiGe solid phases during amorphous to crystalline transformation of Ge films in contact with Bi. Ge/Bi/Ge sandwich films with Bi film between amorphous Ge films, which were fabricated by sequential deposition of components in vacuum, were used in the study. The total thickness and composition of the sandwich films varied in the range from 30 to 400 nm and 22 – 48 wt% Bi, respectively. Electron diffraction, high-resolution (S)TEM imaging, EDX and EEL spectroscopy were used for in situ and ex-situ characterization of morphology, composition, and structure of Ge/Bi/Ge films in a temperature range 20-271°*** proved formation of polycrystalline Ge films containing up to 28 wt% Bi during low temperature treatment. The interaction process was activated at ≈150 °C resulting in crystallization of Ge with simultaneous formation of homogeneous supersaturated solid solution in the whole volume of the film already at ≈210 °C. We showed that the formation of crystalline Ge films with extended solid solubility of Bi depended on the overall composition of the tri-layer film and not on its thickness. The role of the metal-induced crystallization of the amorphous germanium in the formation of the supersaturated solid phases is discussed. © 2024, The Authors. All rights reserved.

关键词： Solubility

Algebraic curves as a source of separable multi-Hamiltonian systems

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Blaszak, Maciej Marciniak, Krzysztof Faculty of Physics Department of of Mathematical Physics and Computer Modelling A. Mickiewicz University Poznań61-614 Poland Department of Science and Technology Campus Norrköping Linköping University Norrköping601-74 Sweden

In this paper we systematically consider various ways of generating integrable and separable Hamiltonian systems in canonical and in non-canonical representations from algebraic curves on the plane. In particular, we consider Stäckel transform between two pairs of Stäckel systems, generated by 2n-parameter algebraic curves on the plane, as well as Miura maps between Stäckel systems generated by (n+N)-parameter algebraic curves, leading to multi-Hamiltonian representation of these *** Codes 14H70, 37J35, 70H20 © 2024, CC BY.

关键词： Hamiltonians

Establishing a leader in a pairwise comparisons method

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Szybowski, Jacek Kulakowski, Konrad Mazurek, Jiri Ernst, Sebastian AGH University of Krakow The Faculty of Applied Mathematics al. A. Mickiewicza 30 Krakow30-059 Poland AGH University of Krakow The Department of Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland Silesian University in Opava School of Business Administration in Karvina Univerzitní nám. 1934 Karviná733 40 Czech Republic

Like electoral systems, decision-making methods are also vulnerable to manipulation by decision-makers. The ability to effectively defend against such threats can only come from thoroughly understanding the manipulation mechanisms. In the presented article, we show two algorithms that can be used to launch a manipulation attack. They allow for equating the weights of two selected alternatives in the pairwise comparison method and, consequently, choosing a leader. The theoretical considerations are accompanied by a Monte Carlo simulation showing the relationship between the size of the PC matrix, the degree of inconsistency, and the ease of manipulation. This work is a continuation of our previous research published in the paper [30]. © 2024, CC BY.

关键词： Monte Carlo methods

Cartesian Genetic Programming Approach for Designing Convolutional Neural Network

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Krzywda, Maciej Lukasik, Szymon Gandomi, Amir H. Faculty of Physics and Applied Computer Science AGH University of Krakow al. Mickiewicza 30 Kraków30-059 Poland Systems Research Institute Polish Academy of Sciences ul. Newelska 6 Warsaw01-447 Poland Faculty of Engineering and IT University of Technology Sydney 5 Broadway UltimoNSW2007 Australia Óbuda University Bécsi út 96/B Budapest1034 Hungary

The present study covers an approach to neural architecture search (NAS) using Cartesian genetic programming (CGP) for the design and optimization of Convolutional Neural Networks (CNNs). In designing artificial neural networks, one crucial aspect of the innovative approach is suggesting a novel neural architecture. Currently used architectures have mostly been developed manually by human experts, which is a time-consuming and error-prone process. In this work, we use pure Genetic Programming Approach to design CNNs, which employs only one genetic operation, i.e., mutation. In the course of preliminary experiments, our methodology yields promising results. © 2024, CC BY.

关键词： Convolutional neural networks