Metoda citlivé optoelektronické detekce a její aplikace

Katedra telekomunikační technik

Additional Drive of Road HPV

Tato bakalářská práce je zaměřena na popis moderních trendů v oblasti pomocných po-honů silničních vozidel poháněných lidskou silou. Zabývá se jejich základní konstrukcí, nej-důležitějšími součástmi, možností rekuperace a naznačuje budoucí vývoj.This bachelor’s thesis is focused on the description of modern trends in additional drives of human powered vehicles study. It deals with the basic structures, the most important parts, recovery possibility and suggests future developments.

Generalization of coloring linear transformation

The paper is focused on the technique of linear transformation between correlated and uncorrelated Gaussian random vectors, which is more or less commonly used in the reliability analysis of structures. These linear transformations are frequently needed to transform uncorrelated random vectors into correlated vectors with a prescribed covariance matrix (coloring transformation), and also to perform an inverse (whitening) transformation, i.e. to decorrelate a random vector with a non-identity covariance matrix. Two well-known linear transformation techniques, namely Cholesky decomposition and eigendecomposition (also known as principal component analysis, or the orthogonal transformation of a covariance matrix), are shown to be special cases of the generalized linear transformation presented in the paper. The proposed generalized linear transformation is able to rotate the transformation randomly, which may be desired in order to remove unwanted directional bias. The conclusions presented herein may be useful for structural reliability analysis with correlated random variables or random fields

Database of fracture-mechanical concrete parameters and its implementation into software FReET

Příspěvek přibližuje tvorbu databáze lomově-mechanických parametrů betonů vybraných pevnostních tříd a její implementaci do pravděpodobnostního softwaru FReET. Podklad databáze představují výsledky dříve provedených lomových zkoušek trámců se zářezem, na jejichž realizaci se podílely širší týmy pracovníků Ústavu stavební mechaniky a Ústavu stavebního zkušebnictví fakulty stavební VUT v Brně. Implementovaná databáze bude využita pro potřeby pravděpodobnostních výpočtů betonových konstrukcí.The paper presents the database of fracture-mechanical parameters of selected concrete strength classes and its implementation into probabilistic software FReET. A basis for the database were the results of earlier performed fracture tests of notched beams, which were realized in close cooperation of research teams from Institute of Structural Mechanics and Institute of Testing, Faculty of Civil Engineering, Brno University of Technology. The implemented database will be used for the reliability calculations in mentioned software

Probabilistic assessment and sensitivity analysis of existing concrete bridge via surrogate modeling

The paper is focused on probabilistic assessment and sensitivity analysis of existing prestressed concrete bridge using surrogate model in form of Polynomial Chaos Expansion (PCE). The bridge was selected in the framework of the European Project INTERREG AUSTRIA-CZECH REPUBLIC "TCZ190 SAFEBRIDGE" focused on advanced numerical analysis of existing bridges represented by non-linear finite element model. In this study, surrogate model in form of PCE was created, which represents very efficient type of surrogate model. One of significant advantages of PCE is powerful post-processing including sensitivity and moment analysis of the response, which is important part of probabilistic analysis. The obtained numerical results of advanced stochastic analysis consisting of uncertainty quantification and sensitivity analysis of the existing bridge structure are presented in the paper

Semi-probabilistic assessment of existing bridge using simplified methods for estimation of variance

The paper is focused on assessment of existing prestressed concrete bridge by simplified methods for estimation of coefficient of variation. The bridge was selected in the framework of the European Project INTERREG AUSTRIA-CZECH REPUBLIC "ATCZ190 SAFEBRIDGE" focused on advanced numerical analysis of existing bridges represented by non-linear finite element model. The key ingredient in semi-probabilistic design and assessment of structures is an estimation of coefficient of variation (ECoV). Recently, correlation interval approach together with novel Eigen ECoV were proposed by authors of this paper and theoretically proved to be an efficient and accurate alternative to existing methods. This contribution is focused on practical application of Eigen ECoV on real example solved by NLFEM and its comparison with other existing simplified methods

On Taylor Series Expansion for Statistical Moments of Functions of Correlated Random Variables dagger

The paper is focused on Taylor series expansion for statistical analysis of functions of random variables with special attention to correlated input random variables. It is shown that the standard approach leads to significant deviations in estimated variance of non-linear functions. Moreover, input random variables are often correlated in industrial applications; thus, it is crucial to obtain accurate estimations of partial derivatives by a numerical differencing scheme. Therefore, a novel methodology for construction of Taylor series expansion of increasing complexity of differencing schemes is proposed and applied on several analytical examples. The methodology is adapted for engineering applications by proposed asymmetric difference quotients in combination with a specific step-size parameter. It is shown that proposed differencing schemes are suitable for functions of correlated random variables. Finally, the accuracy, efficiency, and limitations of the proposed methodology are discussed

Design of a Universal B2B Web Portal for Spare Parts in Chosen Company

Diplomová práce se zabývá návrhem univerzálního webového portálu, který umožní propojení informačního systému zvolené firmy s libovolným informačním systémem jak dodavatelů, tak odběratelů. Webový portál obsahuje především informace o skladových zásobách, cenách jednotlivých produktů a nabízí moduly jako je správa účtů obchodních partnerů, vytváření slevových akcí a možnost objednávky předem vybraných produktů. Implementace je provedena v jazyce PHP za podpory databáze MySQL. Dílčím cílem diplomové práce je nasazení takto vytvořeného portálu ve zvolené společnosti a pro její obchodní partnery.The master's thesis deals with the design of a universal web portal, which will allow any information system of a selected company to be interconnected with any information system of suppliers and customers. The web portal will contain information about availability, product pricing, and offers modules such as managing business partners accounts, creating special offers and ordering pre-selected products. Implementation is performed in PHP with MySQL database support. The partial aim of this master's thesis is to deploy the designed portal in the chosen company and for its business partners.

Two sensor temperature measurement

Tato práce se zabývá návrhem desky plošných spojů a naprogramováním mikrokontroléru AVR, který komunikuje s WiFi modulem a číslicovými teploměry značky Dallas. WiFi modul posíla data dále do databáze uložené na internetu. Při selhání komunikace se počítá se zápisem do paměti EEPROM uvnitř mikrokontroléru. Při obnovení komunikace jsou data z EEPROM vyjmuta a odeslána do databáze.This thesis deals with PCB design and programming of microcontroller AVR, that communicates with WiFi module and Dallas brand thermometers. Wifi module sends data to internet database. In case of communication malfunction informations are saved into microcontroler´s EEPROM. When communication is restored informations are send to database.