323,772 research outputs found
On sheaves of Abelian groups and universality
No full text[EN] Universal elements are one of the most essential parts in research fields, investigating if there exist (or not) universal elements in different classes of objects. For example, classes of spaces and frames have been studied under the prism of this universality property. In this paper, studying classes of sheaves of Abelian groups, we construct proper universal elements for these classes, giving a positive answer to the existence of such elements in these classes. Moscow Center of Fundamental and Applied MathematicsIliadis, S.; Sadovnichy, YV. (2021). On sheaves of Abelian groups and universality. Applied General Topology. 22(1):149-167. https://doi.org/10.4995/agt.2021.14422OJS149167221G. E. Bredon, Sheaf Theory, McGraw-Hill, New York, 1967T. Dube, S. Iliadis, J. van Mill and I. Naidoo, Universal frames, Topology and its Applications 160, no. 18 (2013), 2454-2464. https://doi.org/10.1016/j.topol.2013.07.039D. N. Georgiou, S. D. Iliadis and A. C. Megaritis, On base dimension-like functions of the type Ind, Topology and its Applications 160, no. 18 (2013), 2482-2494. https://doi.org/10.1016/j.topol.2013.07.042D. N. Georgiou, S. D. Iliadis, A. C. Megaritis and F. Sereti, Universality property and dimension for frames, Order 37, no. 3 (2019), 427-444. https://doi.org/10.1007/s11083-019-09513-3D. N. Georgiou, S. D. Iliadis, A. C. Megaritis and F. Sereti, Small inductive dimension and universality on frames, Algebra Universalis 80, no. 2 (2019), 21-51. https://doi.org/10.1007/s00012-019-0593-5P. S. Gevorgyan, S. D. Iliadis and Yu V. Sadovnichy, Universality on frames, Topology and its Applications 220 (2017), 173-188. https://doi.org/10.1016/j.topol.2017.02.010S. D. Iliadis, A construction of containing spaces, Topology and its Applications 107 (2000), 97-116. https://doi.org/10.1016/S0166-8641(00)90095-6S. D. Iliadis, Mappings and universality, Topology and its Applications 137, no. 1-3 (2004), 175-186. https://doi.org/10.1016/S0166-8641(03)00207-4S. D. Iliadis, Universal Spaces and Mappings, North-Holland Mathematics Studies 198, Elsevier, 2005.S. D. Iliadis, On isometrically universal spaces, mappings, and actions of groups, Topology and its Applications 155, no. 14 (2008), 1502-1515. https://doi.org/10.1016/j.topol.2008.03.006S. D. Iliadis, Universal elements in some classes of mappings and classes of G-spaces, Topology and its Applications 156, no. 1 (2008), 76-82. https://doi.org/10.1016/j.topol.2008.04.010S. D. Iliadis, A separable complete metric space of dimension n containing isometrically all compact metric spaces of dimension n, Topology and its Applications 160, no. 11 (2013), 1271-1283. https://doi.org/10.1016/j.topol.2013.04.020S. D. Iliadis and I. Naidoo, On isometric embeddings of compact metric spaces of a countable dimension, Topology and its Applications 160, no. 11 (2013), 1284-1291. https://doi.org/10.1016/j.topol.2013.04.021S. D. Iliadis, On embeddings of topological groups, Fundamental and Applied Mathematics 20, no. 2 (2015), 105-112 (Russian). Journal of Mathematical Sciences 223, no. 6 (2017), 720-724 (English). https://doi.org/10.1007/s10958-017-3381-9S. D. Iliadis, On isometric embeddings of separable metric spaces, Topology and its Applications 179 (2015), 91-98. https://doi.org/10.1016/j.topol.2014.08.019S. D. Iliadis, Dimension and universality on frames, Topology and its Applications 201 (2016), 92-109. https://doi.org/10.1016/j.topol.2015.12.029S. D. Iliadis, On spaces continuously containing topological groups, Topology and its Applications 272 (2020),107072. https://doi.org/10.1016/j.topol.2020.107072S. D. Iliadis, On actions of spaces continuously containing topological groups, Topology and its Applications 275 (2020), 107035. https://doi.org/10.1016/j.topol.2019.10703
Brain-inspired computing and machine learning
No full textIliadis LS, Kurkova V, Hammer B. Brain-inspired computing and machine learning. NEURAL COMPUTING & APPLICATIONS. 2020
ART-based Fusion of Multi-Modal Information for Mobile Robots
No full textBerghöfer E, Schulze D, Tscherepanow M, Wachsmuth S. ART-based Fusion of Multi-Modal Information for Mobile Robots. In: Iliadis L, Jayne C, eds. Proceedings of the International Conference on Engineering Applications of Neural Networks (EANN). IFIP Advances in Information and Communication Technology. Vol 363. Berlin: Springer; 2011: 1-10.Robots operating in complex environments shared with humans are confronted with numerous problems. One important problem is the identification of obstacles and interaction partners. In order to reach this goal, it can be beneficial to use data from multiple available sources, which need to be processed appropriately. Furthermore, such environments are not static. Therefore, the robot needs to learn novel objects. In this paper, we propose a method for learning and identifying obstacles based on multi-modal information. As this approach is based on Adaptive Resonance Theory networks, it is inherently capable of incremental online learning
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
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
The Thermonuclear Runaway and the Classical Nova Outburst
No full textNova explosions occur on the white dwarf component of a Cataclysmic Variable binary stellar system that is accreting matter lost by its companion. When sufficient material has been accreted by the white dwarf, a thermonuclear runaway occurs and ejects material in what is observed as a Classical Nova explosion. We describe both the recent advances in our understanding of the progress of the outburst and outline some of the puzzles that are still outstanding. We report on the effects of improving both the nuclear reaction rate library and including a modern nuclear reaction network in our one-dimensional, fully implicit, hydrodynamic computer code. In addition, there has been progress in observational studies of Supernovae Ia with implications about the progenitors and we discuss that in this review. Starrfield, S; Iliadis, C; Hix, W
Statistical methods for thermonuclear reaction rates and nucleosynthesis simulations
No full textabstract: Rigorous statistical methods for estimating thermonuclear reaction rates and nucleosynthesis are becoming increasingly established in nuclear astrophysics. The main challenge being faced is that experimental reaction rates are highly complex quantities derived from a multitude of different measured nuclear parameters (e.g., astrophysical S-factors, resonance energies and strengths, particle and γ-ray partial widths). We discuss the application of the Monte Carlo method to two distinct, but related, questions. First, given a set of measured nuclear parameters, how can one best estimate the resulting thermonuclear reaction rates and associated uncertainties? Second, given a set of appropriate reaction rates, how can one best estimate the abundances from nucleosynthesis (i.e., reaction network) calculations? The techniques described here provide probability density functions that can be used to derive statistically meaningful reaction rates and final abundances for any desired coverage probability. Examples are given for applications to s-process neutron sources, core-collapse supernovae, classical novae, and Big Bang nucleosynthesis.Copyright IOP Publishing. This is the authors' final, peer-reviewed manuscript. Iliadis, Christian, Longland, Richard, Coc, Alain, Timmes, F. X., & Champagne, Art E. (2015). Statistical methods for thermonuclear reaction rates and nucleosynthesis simulations. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 42, 034007. The final version as published can be viewed online at http://dx.doi.org/10.1088/0954-3899/42/3/03400
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Fuzzy-logic inference for early detection of sleep onset in car driver
No full textHeart rate variability (HRV) is an important sign because it reflects
the activity of the autonomic nervous system (ANS), which controls most of the
physiological activity of the subjects, including sleep. The balance between the
sympathetic and parasympathetic branches of the nervous system is an effective indicator of heart rhythm and, indirectly, heart rhythm is related to a patient’s state of wakefulness or sleep. In this paper we present a research that models a
fuzzy logic inference engine for early detection of the onset of sleep in people driving a car or a public transportation vehicle. ANS activity reflected in the HRV signal is measured by electrocardiogram (ECG). Power spectrum density (PSD) is computed from the HRV signal and ANS frequency activity is then measured. Crisp measurements such as very low, low, and high HRV and lowto-high frequency ratio variability are fuzzified and evaluated by a set of fuzzylogic rules that make inferences about the onset of sleep in automobile drivers. An experimental test environment has been developed to evaluate this method and its effectiveness
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