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Long-living periodic solutions of complex cubic-quintic Ginzburg-Landau equation in the presence of intrapulse Raman scattering: A bifurcation and numerical study

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Physical Review E 2024年第2期110卷 024214页

作者： Ivan M. Uzunov Svetoslav G. Nikolov Todor N. Arabadzhiev Zhivko D. Georgiev Department of Applied Physics Faculty of Applied Mathematics and Informatics Department of Mechanics Department of Theoretical Electrical Egineering

We have found long-living periodic solutions of the complex cubic-quintic Ginzburg-Landau equation (CCQGLE) perturbed with intrapulse Raman scattering. To achieve this we have applied a model system of ordinary differential equations (SODE). A set of the fixed points of the system has been described. A complete phase portrait as well as phase portraits near the fixed points have been built for a proper choice of parameters. The behavior of the model system near the fixed points has been determined. We have presented a detailed description of the subcritical Poincaré-Andronov-Hopf bifurcation due to the intrapulse Raman scattering that appears at one of the fixed points. We have established that there appears an unstable limit cycle in the SODE. To check the validity of the obtained results from the model system we have compared them with the results of the numerical solution of the CCQGLE perturbed with intrapulse Raman scattering. There has been found a remarkable correspondence between the obtained numerical results for the amplitude and frequency of the soliton pulses and the results for these parameters of the bifurcation theory. We have observed that the numerical characteristics of the propagating solitonlike pulses—amplitude, frequency, width, and position—periodically change if we change the distance with a period determined by the bifurcation analysis.

关键词： Bifurcations Nonlinear optics Ultrafast optics Fiber lasers Optical fibers

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Advanced Feature Extraction and Machine Learning Techniques for Classifying Steam Game Feedback

International Journal of Interactive Mobile Technologies

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International Journal of Interactive Mobile Technologies 2025年第1期19卷 107-125页

作者： Al Tawil, Arar Fathi, Hanaa Alzoubi, Sharaf Shaban, Amneh Almazaydeh, Laiali H. Faculty of Information Technology Applied Science Private University Amman Jordan College of Computer Science and Informatics Amman Arab University Amman Jordan College of Engineering AbuDhabi University Abu Dhabi United Arab Emirates

The gaming industry produces vast amounts of user-generated feedback, making it challenging for developers to efficiently analyze and respond to real-time reviews. This study addresses the problem of classifying large-scale unstructured user feedback from Steam reviews. In this paper an approach that integrates traditional machine learning models and deep learning models is proposed. XGBoost is used to manage feature-rich datasets, reducing overfitting. Long-short-term memory (LSTM) and Bi-directional LSTM are used to enhance the accuracy and robustness of classification. Feature extraction techniques, such as sentiment analysis and topic modeling, are employed to enrich the dataset and improve model performance. The experimental results show that the XGBoost model achieved the highest performance with an accuracy of 0.9499 and a ROC-AUC score of 0.6113, demonstrating superior performance in distinguishing between positive and negative feedback. In comparison, deep learning models such as LSTM and Bi-directional LSTM showed lower ROC-AUC scores, indicating less effectiveness in handling the classification task. This approach offers game developers a reliable and scalable solution for classifying user sentiment, leading to better game improvements based on user reviews. © 2025 by the authors of this article.

关键词： Contrastive Learning

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Utilizing Citizen-Driven Scientific Endeavors for Freshwater Pollution Surveillance: A case report of Lake Sevan, Armenia 22

Utilizing Citizen-Driven Scientific Endeavors for Freshwater...

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2024 IEEE 22nd World Symposium on applied Machine Intelligence and informatics, SAMI 2024

作者： Voskanyan, Marine Ghorbani, Hamzeh Azodinia, Reza Faculty of General Medicine 38a Marshal Babajanyan St. Yerevan0040 Armenia Obuda University Doctoral School of Applied Informatics and Applied Mathematics Budapest Hungary

ISBN: (纸本)9798350317206

The escalating demand for freshwater is intricately influenced by climatic fluctuations, ongoing economic development, and a growing population. Exploring innovative approaches, such as citizen science (CSc) integration, becomes imperative in preserving our vital water resources. This article delves into a comprehensive monitoring strategy and success factors within a CSc initiative, centered on evaluating water quality in Lake Sevan, a crucial contributor to the broader South Caucasus region's environmental and political landscape. The deteriorating water quality in Lake Sevan can be attributed to a combination of external factors, including the discharge of domestic, agricultural, and industrial effluents, the expansion of waterlogged forested areas, and rising temperatures. According to a rigorous five-Tier grading system, Lake Sevan's water quality is currently graded at the 4th tier, indicating severe impairment in its ability to recover. Visible algal blooms on the water's surface exacerbate an already precarious situation, aggravated further by insufficient data due to the lack of human resources and inadequate investments from governmental and international entities like Deutsche Gesellschaft fur Internationale Zusammenarbeit (GIZ) and the United Nations Development Programme (UNDP). This study aims to address vital research questions, primarily concerning the dynamics of water quality changes and the development of a tailored CSc monitoring plan. The research methodology involves analyzing water quality datasets from both government sources and publicly accessible records over the past three years. Additionally, a comprehensive review of international CSc projects serves as a reference for this case study. The findings unmistakably indicate that Lake Sevan's water quality is critically rated at the 4th tier. To comprehensively understand and monitor the lake's dynamics, the implementation of a well-designed water quality monitoring framework with critical s

关键词： Water quality

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Adapting Is Difficult! Introducing a Generic Adaptive Learning Framework for Learner Modeling and Task Recommendation Based on Dynamic Bayesian Networks 15

Adapting Is Difficult! Introducing a Generic Adaptive Learni...

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15th International Conference on Computer Supported Education, CSEDU 2023

作者： Gnadlinger, Florian Selmanagić, André Simbeck, Katharina Kriglstein, Simone Faculty of Computer Science Communication and Economics University of Applied Sciences Berlin Germany Faculty of Informatics Masaryk University Czech Republic

ISBN: (纸本)9789897586415

The process of learning is a personal experience, strongly influenced by the learning environment. Virtual learning environments (VLEs) provide the potential for adaptive learning, which aims to individualize learning experiences in order to improve learning outcomes. Adaptive learning environments achieve individualization by analyzing the learners and altering the instruction according to their specific needs and goals. Despite ongoing research in adaptive learning, the effort to design, develop and implement such environments remains high. Therefore, we introduce a novel, generalized adaptive learning framework based on the methodological Evidence-Centered Design (ECD) framework. Our framework focuses on the analysis of learners’ competencies and the subsequent recommendation of tasks with an appropriate difficulty level. With this paper and the open-source adaptive learning framework, we contribute to the ongoing discussion about generalized adaptive learning technology. Copyright © 2023 by SCITEPRESS – Science and Technology Publications, Lda.

关键词： E-learning

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On the Uncrossed Number of Graphs 32

On the Uncrossed Number of Graphs

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32nd International Symposium on Graph Drawing and Network Visualization, GD 2024

作者： Balko, Martin Hliněný, Petr Masařík, Tomáš Orthaber, Joachim Vogtenhuber, Birgit Wagner, Mirko H. Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic Faculty of Informatics Masaryk University Brno Czech Republic Institute of Informatics Faculty of Mathematics Informatics and Mechanics University of Warsaw Poland Institute of Software Technology Graz University of Technology Austria Institute of Computer Science Osnabrück University Germany

ISBN: (纸本)9783959773430

Visualizing a graph G in the plane nicely, for example, without crossings, is unfortunately not always possible. To address this problem, Masařík and Hliněný [GD 2023] recently asked for each edge of G to be drawn without crossings while allowing multiple different drawings of G. More formally, a collection D of drawings of G is uncrossed if, for each edge e of G, there is a drawing in D such that e is uncrossed. The uncrossed number unc(G) of G is then the minimum number of drawings in some uncrossed collection of G. No exact values of the uncrossed numbers have been determined yet, not even for simple graph classes. In this paper, we provide the exact values for uncrossed numbers of complete and complete bipartite graphs, partly confirming and partly refuting a conjecture posed by Hliněný and Masařík [GD 2023]. We also present a strong general lower bound on unc(G) in terms of the number of vertices and edges of G. Moreover, we prove NP-hardness of the related problem of determining the edge crossing number of a graph G, which is the smallest number of edges of G taken over all drawings of G that participate in a crossing. This problem was posed as open by Schaefer in his book [Crossing Numbers of Graphs 2018]. © Martin Balko, Petr Hliněný, Tomáš Masařík, Joachim Orthaber, Birgit Vogtenhuber, and Mirko H. Wagner.

关键词： Graph theory

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Analysis of Possible Eufectic Composition of Fuel and Blanket Salts for Liquid Fluoride Thorium Reactor on Martian Surface

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JBIS - Journal of the British Interplanetary Society 2022年第9期75卷 300-304页

作者： Pawlicki, Diana Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 Lodz90-236 Poland

With the newly landed Perseverance Mars rover utilizing the power of the atom the question of effective power in extraterrestrial environment, especially on Mars, turns in the direction of nuclear even more prominently. With many options in that field considered, reworked and tested, perhaps one of the most promising is Liquid Fluoride Thorium Reactor, which can be modually produced, mounted, and gives the best results with the least risk. Optimizing for its effectivity brought research on in-situ production of its salt components and while it shows great promise, possible eutectics should be considered. This paper stands as a research and analysis of such eutectics' composition, in order to avoid the usage of beryllium and other harmful and rare components as well as optimize the reactor for in-situ production and functionality in Martian environment. © 2022 British Interplanetary Society. All rights reserved.

关键词： Fluorine compounds

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Verifying EFL Autonomous Learning by Digital Gaming: Definitions and Concepts

International Journal of Emerging Technologies in Learning

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International Journal of Emerging Technologies in Learning 2023年第5期18卷 253-260页

作者： Al-Obaydi, Liqaa Habeb Pikhart, Marcel Klimova, Blanka English Department College of Education for Human Sciences University of Diyala Baqubah Iraq Department of Applied Linguistics Faculty of Informatics and Management University of Hradec Kralove Czech Republic

Currently, basically everyone is surrounded by digital media and they are used for various human activities, including learning. The aim of this study is to verify how much digital gaming can be used for unintentional language acquisition within the concept of autonomous learning. A few young participants took part in the research in which they were observed how much digital gaming in their free time can influence autonomy in their learning of a foreign language. Several definitions from authoritative sources were chosen and applied in the given context. The final results of the study demonstrate that no real language leaning and no real autonomous learning is found in such an accidental learning environment as digital gaming. It does not provide any stimulation for the participants and these findings could be important for those who are responsible for the design of various digital tools available so that they could make them more stimulating in the area of autonomy as there is a vast potential in it © 2023, International Journal of Emerging Technologies in *** Rights Reserved.

关键词： Digital storage

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Computer Verifications of Regular Representations of Groups of Orders Smaller than 33 via k-Hypergraphs 22

Computer Verifications of Regular Representations of Groups ...

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22nd Conference Information Technologies - Applications and Theory, ITAT 2022

作者： Mihálová, Dominika Comenius University Faculty of Mathematics Physics and Informatics Department of Applied Informatics Bratislava Slovakia

Given a finite group G, the hypergraphical regular representation problem asks about the existence of a hypergraph whose full automorphism group is equal to G acting regularly on the set of its vertices. In our paper, we work with k-hypergraphs which are hypergraphs in which each hyperedge is of the same size k. Since the existence or non-existence of hypergraphical regular representations for groups of the order exceeding the value 32 has been proved theoretically, our focus is on a computational verification of hypergraphical regular representation via k-hypergraphs for groups of order smaller than or equal to 32. For all groups of order less than or equal to 32, except for the group Z52, we computationally proved a conjecture stating that if a group G admits a hypergraphical regular representation via some n-hypergraph, it admits the hypergraphical regular representation for every k-hypergraph in the range n ≤ k ≤ |G| − n. To obtain our results, we created and implemented algorithms in the computational system GAP. © 2022 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： computer verification k-kypergraphs regular representation

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An Algorithmic Approach to Determining Spectra of Orders of (k, g)-Graphs 23

An Algorithmic Approach to Determining Spectra of Orders of ...

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23rd Conference Information Technologies - Applications and Theory, ITAT 2023

作者： Eze, Leonard Chidiebere Jajcay, Robert Mihálová, Dominika Department of Algebra and Geometry Faculty of Mathematics Physics and Informatics Comenius University Mlynska Dolina Bratislava84248 Slovakia Department of Applied Informatics Faculty of Mathematics Physics and Informatics Comenius University Mlynska Dolina Bratislava84248 Slovakia

A (k, g)-graph Γ, k ≥ 2, g ≥ 3, is k-regular of girth g. We refer to the complete set of possible orders of connected (k, g)-graphs for each pair of parameters (k, g) as the spectrum of orders of (k, g)-graphs;or the (k, g)-spectrum. The smallest member of the (k, g)-spectrum is the order n(k, g) of a smallest (k, g)-graph;called a (k, g)-cage. Determining the complete spectrum of orders of connected (k, g)-graphs for a specific pair (k, g) is extremely difficult as it requires (among other things) determining the cage order n(k, g), which is a notoriously hard problem. This paper provides an algorithmic approach for producing (k, g)-graphs of larger orders from smaller (k, g)-graphs in a manner allowing for repeated applications. We use this approach to determine/estimate the smallest member N(k, g) of a (k, g)-spectrum having the property that starting from N(k, g) all (even;in case of odd k) n ≥ N(k, g) belong to the (k, g)-spectrum;i.e., for all (even) n ≥ N(k, g), there exists a (k, g)-graph of order n. © 2022 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). CEUR Workshop Proceedings (***)

关键词： Graphic methods

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Enhancing Diabetes Management Through GRU Analysis of Physical Activity Effects 22

Enhancing Diabetes Management Through GRU Analysis of Physic...

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22nd IEEE International Symposium on Intelligent Systems and informatics, SISY 2024

作者： Simon, Barbara Hartveg, Ádam Siket, Máté Denes-Fazakas, Lehel Kovács, Levente Szilagyi, Laszlo Kertesz, Gabor Eigner, Gyorgy University Research and Innovation Center Physiological Controls Research Center Óbuda University Budapest Hungary Óbuda University John von Neumann Faculty of Informatics Budapest Hungary Óbuda University Applied Informatics and Applied Mathematics Doctoral School Budapest Hungary

ISBN: (纸本)9798350385601

This study addresses the insufficient consideration of physical activity in managing Type 1 diabetes mellitus, using real patient data from the Ohio dataset to assess its impact. We utilize GRU models, known for capturing temporal dependencies, to analyze physical activity patterns and their influence on glycemic state. Additionally, we examine various parameters affecting GRU performance, such as input sequence length, hidden units, and learning rates, to understand how they impact accurate prediction of physical activity effects on glycemic state. By lever-aging the Ohio dataset and exploring different GRU parameters, we aim to improve personalized diabetes management strategies tailored to individual patient requirements. © 2024 IEEE.

关键词： Diseases

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