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The Use of Metohods of the Project Management in Company
Krčmář, Vít ; Zeman, Jan (referee) ; Smolíková, Lenka (advisor)
Dissertation deals with a draft of the system for monitoring and planning of attendance of promoters on the stores of the Slovakian store chain NAY, where the project management is used for securing of versatilely effective project. PEST, SWOT, RIPRAN of analysis and analysis of risks are used in this draft. It contains the plan of solution from the schematic imaging to the graphic previews and time schedule of realization. This is the real project from practice which should be realized based on this dissertation and commercially spread and innovated.
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Information System Assessment and a Proposal for ICT Modification
Zeman, Jan ; Potměšil, Tomáš (referee) ; Koch, Miloš (advisor)
This diploma thesis analyzes the information system named TDoC, which is operated at company Siemens, s.r.o., Industrial Turbomachinery, subsidiary company. The theoretical part focuses on defining the theory and history of information systems and databases, as well as on the description of the risk analysis. The aim of this work is to analyze the current state of information system, assessment of the condition, finding risks and propose measures to improve the current situation and elimination the risks.
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Rheological study of high-molecular weight hyaluronan-protonated aminoacids interactions
Zeman, Jan ; Běťák, Jiří (referee) ; Chytil, Martin (advisor)
The study deals with interactions of hyaluronic acid with protonized amino acids Lysin and 6-aminocaproic acid. To study the interactions pH-metry, conductance measurement and reometry were used. The mixtures of hyaluronan and the aminoacids of different concentrations were measured and the data were compered with data obtained from measurement of amino acid samples in pure water. Observed interactions occured in the aminoacids concentrations between 0 to 10 mmolxdm3, then the HyA carboxylic groups were fully bonded by amino acids and no more interactions were recognized.
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Investigation of Polyelectrolytes Interactions with Cationic Aminogroups-containing Amphiphiles
Zeman, Jan ; Běťák, Jiří (referee) ; Chytil, Martin (advisor)
The study deals with interactions of polyelectrolytes polystyrene sulfonate and hyaluronic acid with nitrogenic amphiphilic substances, represented by lysine and albumine. To study the interactions pH-metry, conductance, viscositic and turbidity measurement, DLS and reometry were used. All mixtures of different concentrations were measured and the data were compered with data obtained from measurement of samples with amphiphilic sumstances without polyelectrolytes. Observed interactions occured in the aminoacid concentrations between 0 to 20 mmoldm-3, then the PSS interaction groups were fully bonded by lysine and no more interactions were recognized. The same behaviour were observed in albumine solutions with concentration under 2 gdm-3.
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The effect of the covid-19 pandemic on the spatial organisation of air transport in Africa.
ZEMAN, Jan
The key topic of this bachelor thesis is the analysis of the spatial organization intracontinental of the air transport in Africa in 2019 and 2020 when it was affected by the covid 19 pandemic. In the introductory part, the bachelor thesis is presented, the objectives of the thesis are set and also hypotheses that will be later confirmed or refuted. The introductory part is followed by the theoretical part where the theory of the air transport is introduced, concepts related to this mode of the transport in general and then concepts that are typical for transport in Africa. In the second part of the thesis is a transition from the theoretical to the analytical part. The analytical part has two subchapters, the first deals with the analysis of the domestic air transport in 2019 when it was not yet limited by the covid 19 pandemic. The second subchapter is 2020 when the covid 19 pandemic has already greatly affected air transport. The data for processing the analysis are from the ICAO - International Civil Aviation Organization database. Based on this data, intracontinental air transport was compared between 2019 and 2020 when the covid 19 pandemic was spreading.
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Spectral collocation methods in solid mechanics
Trnka, Ladislav ; Průša, Vít (advisor) ; Zeman, Jan (referee)
Spectral collocation methods are advertised as a powerful tool for a numerical so- lution of boundary value problems for ordinary as well as partial differential equations. The methods are based on a polynomial approximation, typically using Chebyshev poly- nomials. In one-dimensional setting, the properties of the methods are well known, and there exist several software packages implementing the methods. Our goal is to assess the applicability of spectral collocation methods in solving two-dimensional boundary value problems. We solve a classical problem in linearised two-dimensional elasticity, namely the deflection of a semi-infinite elastic medium subject to a surface load. The numerical results are compared to the analytical solution, which allows us to evaluate the performance of the given numerical method in solving boundary value problems in linearised elasticity. 1
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Matematické modelování magnetosriktních látek
Vermach, Lukáš ; Kružík, Martin (advisor) ; Zeman, Jan (referee)
4 Title: Mathematical modeling of magnetostrictive materials Author: Lukáš Vermach Department: Mathematical Institute of Charles University Advisor: Priv.-Doz. Dr. habil. RNDr. Martin Kružík Ph.D., Institute of Information Theory and Automation, Academy of Sciences of the Czech Republic Advisor's e-mail address: kruzik@utia.cas.cz Abstract In the present work we introduce an isotermic mathematical model of ferromagnetic shape memory alloys (FSMAs). FSMAs are a special class of magnetostrictive materials, i.e. materials which deform their shape on account of external magnetic field or which change magnetization as a consequence of strain. This property originates from phase transformations that occur within the material when being exposed to external loading. First, the stationary model of FSMA is formulated. The thermodynamical potential is composed (Helmholz free energy) and its non-quasiconvexity is discussed. The quasicon- vexification is performed via the relaxation theory, i.e. quasiconvex envelope construction. For such a model the existence theory is built. Then, taking advantage of the stationary case the evolutionary model is developed. The attention is drawn to hysteresis, which arises from energy dissipation. The time discretization leads to a sequence of hysteresis-modified stationary problems (the...
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Goal-oriented a posteriori error estimates and adaptivity for the numerical solution of partial differential equations
Roskovec, Filip ; Dolejší, Vít (advisor) ; Kanschat, Guido (referee) ; Zeman, Jan (referee)
A posteriori error estimation is an inseparable component of any reliable numerical method for solving partial differential equations. The aim of the goal-oriented a posteriori error estimates is to control the computational error directly with respect to some quantity of interest, which makes the method very convenient for many engineering applications. The resulting error estimates may be employed for mesh adaptation which enables to find a numerical approximation of the quantity of interest under some given tolerance in a very efficient manner. In this thesis, the goal-oriented error estimates are derived for discontinuous Galerkin discretizations of the linear scalar model problems, as well as of the Euler equations describing inviscid compressible flows. It focuses on several aspects of the goal-oriented error estimation method, in particular, higher order reconstructions, adjoint consistency of the discretizations, control of the algebraic errors arising from iterative solutions of both algebraic systems, and linking the estimates with the hp-anisotropic mesh adaptation. The computational performance is demonstrated by numerical experiments.
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Variational Methods in Thermomechanics of Solids
Pelech, Petr ; Kružík, Martin (advisor) ; Dondl, Patrick (referee) ; Zeman, Jan (referee)
The thesis is devoted to study of continuum mechanics and thermodynamics and the related mathematical analysis. It consists of four self-contained chapters dealing with different aspects. The first chapter focuses on peridynamics, a non-local theory of continuum mechanics, and its relation to conventional local theory of Cauchy-Green elasticity. Similar compar- isons has been used for proving consistency and for determining some of the material coefficients in peridynamics, provided the material parameters in the local theory are known. In this chapter the formula for the non-local force-flux is computed in terms of the peridynamic interaction, relating the fundamental concepts of these two theories and establishing hence a new connection, not present in the previous works. The second and third chapters are both devoted to Rate-Independent Systems (RIS) and their applications to continuum mechanics. RIS represents a suitable approximation when the internal, viscous, and thermal effects can be neglected. RIS has been proven to be useful in modeling hysteresis, phase transitions in solids, elastoplasticity, damage, or fracture in both small and large strain regimes. In the second chapter the existence of solutions to an evolutionary rate-independ- ent model of Shape Memory Alloys (SMAs) is proven. The model...
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