B. Glanc, A. Jakubowicz (2003)
Applicationes Mathematicae
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The description of the special Reissner-Nordström space-time in the Planck era is presented and its comparison with the Robertson-Walker space-time is given.
Meri Lisi, Silvia Totaro (2009)
Bollettino dell'Unione Matematica Italiana
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In this paper, we study a one-dimensional mathematical model for a contracting interstellar cloud, with a star inside. Existence and uniqueness of a positive solution are proved by means of the fixed point theorem. A time discretization procedure is given and the case of an expanding interstellar cloud is also considered.
Jakub Szotek (2015)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
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In the paper we give a mathematical overview of the CreditRisk+ model as a tool used for calculating credit risk in a portfolio of debts and suggest some other applications of the same method of analysis.
Akito Tsuboi (2009)
Colloquium Mathematicae
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Let p(x) be a nonprincipal type. We give a sufficient condition for a model M to have a proper elementary extension omitting p(x). As a corollary, we obtain a generalization of Steinhorn's omitting types theorem to the supersimple case.
Alexander Loskutov, Sergei Rybalko, Ekaterina Zhuchkova (2003)
Banach Center Publications
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A quite general model of the nonlinear interaction of two impulse systems describing some types of cardiac arrhythmias is developed. Taking into account a refractory time the phase locking phenomena are investigated. Effects of the tongue splitting and their interweaving in the parametric space are found. The results obtained allow us to predict the behavior of excitable systems with two pacemakers depending on the type and intensity of their interaction and the initial phase. ...
Branzov, Todor (2016)
Serdica Journal of Computing
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The paper studies the approaches to development of goods with active participation of virtual community members. The concept of community-sourcing is presented as an alternative to the open source model and crowdsourcing. On that foundation a conceptual model of resource management system that use some current good practices of the IT industry is proposed. Results obtained in a virtual community implementing the model are presented as a validation attempt. ACM Computing Classification...
D. Banjević (1974)
Matematički Vesnik
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F. Castiglione, S. Motta, F. Pappalardo, M. Pennisi (2012)
Mathematical Modelling of Natural Phenomena
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About twenty five years ago the first discrete mathematical model of the immune system was proposed. It was very simple and stylized. Later, many other computational models have been proposed each one adding a certain level of sophistication and detail to the description of the system. One of these, the Celada-Seiden model published back in 1992, was already mature at its birth, setting apart from the topic-specific nature of the other ...
Miodrag Makmaz, Slobodan Lazović, Zoran Bojković (1996)
The Yugoslav Journal of Operations Research
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Zihan Chen, Yu Xing, Huashu Qin (2019)
Kybernetika
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This paper studies a new model of social opinion dynamics in multiagent system by counting in two important factors, individual susceptibility and anchoring effect. Different from many existing models only focusing on one factor, this model can exhibit not only agreement phenomena, but also disagreement phenomena such as clustering and fluctuation, during opinion evolution. Then we provide several conditions to show how individual susceptibility and anchoring effect work on steady-state...
Enrico Carlon (2008)
Banach Center Publications
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DNA microarrays have been widely used in molecular biology laboratories. The main current application of these devices is the determination of the gene expression level for thousands of genes simultaneously. Here we review a recently introduced physical model for hybridization (i.e. the binding of complementary DNA strands) in Affymetrix arrays and compare it to experimental results. The experimental data follow rather well the microscopic model and the approach offers several advantages...
Saharon Shelah (2012)
Colloquium Mathematicae
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We sort out to a large extent when a (first order complete theory) T has a superlimit model in a cardinal λ. Also we deal with related notions of being limit.