Numerical solution of generalized minimax problems
Lukšan, Ladislav; Matonoha, Ctirad; Vlček, Jan
2018 - anglický Klíčová slova: Numerical optimization; nonlinear approximation; nonsmooth optimization; generalized minimax problems; recursive quadratic programming methods; interior point methods; smoothing methods; algorithms; numerical experiments Plné texty jsou dostupné v digitálním repozitáři Akademie Věd. Numerical solution of generalized minimax problems

Lukšan, Ladislav; Matonoha, Ctirad; Vlček, Jan
Ústav informatiky, 2018

Feedhorn Coating - research report
Václavík, Jan
2017 - anglický The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT layer. The report contains the results and comments for future construction of similar types of devices. Klíčová slova: cnt layer; metalization; vacuum evaporation Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Feedhorn Coating - research report

The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT ...

Václavík, Jan
Ústav fyziky plazmatu, 2017

Chemical and microstructural characterization of the render, sampled from Gloriette, the US Embassy in Prague 1
Slížková, Zuzana; Frankeová, Dita; Viani, Alberto; Hauková, Petra; Koudelková, Veronika; Svoboda, Milan
2017 - anglický The aim of the work was to analyze the mortar taken from the Gloriette (US Embassy, Prague 1). Analyzes were performed for the binder and filler characterization and the sample was also dissolved in HCl to determine the mixing ratio. Klíčová slova: survey; material characterization; chemical composition; binder and aggregate characterization Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Chemical and microstructural characterization of the render, sampled from Gloriette, the US Embassy in Prague 1

The aim of the work was to analyze the mortar taken from the Gloriette (US Embassy, Prague 1). Analyzes were performed for the binder and filler characterization and the sample was also dissolved in ...

Slížková, Zuzana; Frankeová, Dita; Viani, Alberto; Hauková, Petra; Koudelková, Veronika; Svoboda, Milan
Ústav teoretické a aplikované mechaniky, 2017

Paleomagnetic research of the fill in the Kalacka Cave, Poland. Final report. Catalogue of primary paleomagnetic data.
Pruner, Petr; Čížková, Kristýna; Kdýr, Šimon
2017 - anglický Klíčová slova: palaeomagnetism; caves; Kalacka Cave, Poland Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Paleomagnetic research of the fill in the Kalacka Cave, Poland. Final report. Catalogue of primary paleomagnetic data.

Pruner, Petr; Čížková, Kristýna; Kdýr, Šimon
Geologický ústav, 2017

Semigroup Structure of Sets of Solutions to Equation X^s = X^m
Porubský, Štefan
2017 - anglický Using an idempotent semigroup approach we describe the semigroup and group structure of the set of solutions to equation X^m = X^s in successive steps over a periodic commutative semigroup, over multiplicative semigroups of factor rings of residually finite commutative rings and finally over multiplicative semigroups of factor rings of residually finite commutative principal ideal domains. The analysis is done through the use of the maximal subsemigroups and groups corresponding to an idempotent of the corresponding semigroup and in the case of residually finite PID’s employing the available analysis of the Euler-Fermat Theorem as given in [11]. In particular the case when this set of solutions is a union of groups is handled. As a simple application we show a not yet noticed group structure of the set of solutions to x^n = x connected with the message space of RSA cryptosystems and Fermat pseudoprimes. Klíčová slova: set of solutions; idempotent; maximal semigroup corresponding to an idempotent; maximal group corresponding to an idempotent; equation X^s = X^m; finite commutative ring with identity element; residually finite commutative principal ideal domains Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Semigroup Structure of Sets of Solutions to Equation X^s = X^m

Using an idempotent semigroup approach we describe the semigroup and group structure of the set of solutions to equation X^m = X^s in successive steps over a periodic commutative semigroup, over ...

Porubský, Štefan
Ústav informatiky, 2017

Appearance Acquisition and Analysis of Effect Coatings
Filip, Jiří; Maile, F. J.
2017 - anglický Klíčová slova: effect coatings; appearance capturing; polychromatic; particle orientation Dokument je dostupný na externích webových stránkách. Appearance Acquisition and Analysis of Effect Coatings

Filip, Jiří; Maile, F. J.
Ústav teorie informace a automatizace, 2017

Research report 2013-11-18 Calcite SSS6
Kumpová, Ivana; Vopálenský, Michal; Vavřík, Daniel
2017 - anglický Porosity was measured on a irregular sample of calcite, designated Calcite_SSS6, using the TORATOM device in the Centre of Excellence Telč. Klíčová slova: calcite; TORATOM; measuring Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Research report 2013-11-18 Calcite SSS6

Porosity was measured on a irregular sample of calcite, designated Calcite_SSS6, using the TORATOM device in the Centre of Excellence Telč.

Kumpová, Ivana; Vopálenský, Michal; Vavřík, Daniel
Ústav teoretické a aplikované mechaniky, 2017

Multi-period Factor Model of a Loan Portfolio
Šmíd, Martin; Dufek, J.
2017 - anglický We construct a general dynamic model of losses of a large loan portfolio, secured by collaterals. In the model, the wealth of a debtor and the price of the corresponding collateral depend each on two factors: a common one, having a general distribution, and an individual one, following an AR(1) process. The default of a loan happens if the wealth stops to be su cient for repaying the loan. We show that the mapping transforming the common factors into the probability of default (PD) and the loss given default (LGD) is one-to-one twice continuously differentiable. As the transformation is not analytically tractable, we propose a numerical technique for its computation and demonstrate its accuracy by a numerical study.\nWe show that the results given by our multi-period model may differ signi cantly from\nthose resulting from single-period models, and demonstrate that our model naturally replicates\nthe empirically observed decrease of PDs within a portfolio in time. In addition, we give a formula for the overall loss of the portfolio and, as an example of its application, we formulate a simple optimal scoring decision problem and discuss its solution. Klíčová slova: Credit Risk; Structural Factor Models; Loan Portfolio Management Dokument je dostupný na externích webových stránkách. Multi-period Factor Model of a Loan Portfolio

We construct a general dynamic model of losses of a large loan portfolio, secured by collaterals. In the model, the wealth of a debtor and the price of the corresponding collateral depend each on two ...

Šmíd, Martin; Dufek, J.
Ústav teorie informace a automatizace, 2017

Idempotents, Group Membership and their Applications
Porubský, Štefan
2017 - anglický S.Schwarz in his paper [165] proved the existence of maximal subgroups in periodic semigroups and a decade later he brought [167] into play the maximal subsemigroups and thus he embodied the idempotents in the structural description of semigroups. Later in his papers he showed that a proper description of these structural elements can be used to (re)prove many useful and important results in algebra and number theory. The present paper gives a survey of selected results scattered throughout the literature where an semigroup approach based on tools like idempotent, maximal subgroup or maximal subsemigroup either led to a new insight into the substance of the known results or helped to discover new approach to solve problems. Special attention will be given to some disregarded historical connections between semigroup and ring theory. Klíčová slova: multiplicative semigroup; finite semigroups; power semigroups; idempotent elements; finite commutative rings; principal ideal domain; Euler-Fermat theorem; Wilson theorem; matrices over fields; maximal groups contained in a semigroup; periodic sequence; multiplicative semigroup of Zm; semigroup of circulant Boolean matrices Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Idempotents, Group Membership and their Applications

S.Schwarz in his paper [165] proved the existence of maximal subgroups in periodic semigroups and a decade later he brought [167] into play the maximal subsemigroups and thus he embodied the ...

Porubský, Štefan
Ústav informatiky, 2017

Comprehensive geological characterization of URF Bukov – part II Geotechnical characterization.
Souček, Kamil; Vavro, Martin; Staš, Lubomír; Kaláb, Zdeněk; Koníček, Petr; Georgiovská, Lucie; Kaláb, Tomáš; Konečný, Pavel; Kolcun, Alexej; Králová, Lucie; Kubina, Lukáš; Lednická, Markéta; Malík, Josef; Martinec, Petr; Ptáček, Jiří; Vavro, Leona; Waclawik, Petr; Zajícová, Vendula
2017 - anglický This final report was processed as a part of Radioactive Waste Repository Authority project Research support for safety evaluation of the deep repository, which is a part of the preparation for the deep repository of nuclear waste (further DR). The aims of the project were collection and interpretation of geological data, the creation of models and obtaining information necessary for evaluation of potential sites for DR emplacement regarding long-term safety. On the basis of public submitting act, a 4-year contract was signed with ÚJV Řež, a.s. and its subcontractors: Czech Geological Survey, Czech Technical University in Prague, Technical University in Liberec, Institute of Geonics of Czech Academy of Sciences, and companies Arcadis CZ, Progeo, Chemcomex Praha and Centre for Research Řež about providing research support for evaluation of long-term safety. Klíčová slova: spent nuclear fuel; nuclear waste; behaviour of rock environment; radionuclide transport; safety of repository Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Comprehensive geological characterization of URF Bukov – part II Geotechnical characterization.

This final report was processed as a part of Radioactive Waste Repository Authority project Research support for safety evaluation of the deep repository, which is a part of the preparation for the ...

Souček, Kamil; Vavro, Martin; Staš, Lubomír; Kaláb, Zdeněk; Koníček, Petr; Georgiovská, Lucie; Kaláb, Tomáš; Konečný, Pavel; Kolcun, Alexej; Králová, Lucie; Kubina, Lukáš; Lednická, Markéta; Malík, Josef; Martinec, Petr; Ptáček, Jiří; Vavro, Leona; Waclawik, Petr; Zajícová, Vendula
Ústav geoniky, 2017