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Strain and stress analysis of the car buffer zone under impact loading
Nedělka, Pavel ; Obdržálek, Vít (referee) ; Vrbka, Jan (advisor)
The master thesis deals with a stress-strain analysis of the front crash structure of a race car by using the finite element method. The structure is loaded by an impact loading. This type of analysis belongs to the transient analysis so the explicit formulation of the finite element method is used. The LS-DYNA software was used for calculations. The goal of this thesis is to express the influence of the crash structure to the change of the car's kinetic energy as well as the amount of absorbed energy in case of frontal impact.
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Automatic detection of myocardial infarction in ECG
Nejedlý, Lukáš ; Kozumplík, Jiří (referee) ; Smíšek, Radovan (advisor)
This master’s thesis deals with the automatic detection of myocardial infarction in ECG. Semester work consists of two parts. The theoretical part provides a description of the electrical conduction system of the heart, spreading of electrical activity through the heart muscle, the methods of ECG scanning and the ECG curve. There are also mentioned the causes of myocardial ischemia and various methods of its detection. Another part is devoted to high-frequency ECG, analysis of HFQRS and clinical studies which describe the use of high-frequency ECG in diagnosis of myocardial infarction. In the practical part is proposed an algorithm using low-frequency components ECG and an algorithm using high-frequency components ECG for automatic detection of myocardial infarction. The proposed algorithms are implemented in programming environment MATLAB and tested on signals from the PTB database. The final part of the master‘s thesis is devoted to the comparison of the success of myocardial infarction by means of low frequency and high frequency components of ECG and comparison of achieved results with results from clinical studies.
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Glottal Stop and Linking in Czech English
SALABOVÁ, Dita
This diploma thesis focuses on some aspects of pronunciation of Czech speakers of English, which receive relatively little attention, notably on phenomena known as glottal stop and lin-king. The thesis starts from a comparison of the Czech and English phonological system, fol-lowed by a detailed description of the glottal stop and its use. It also provides an explanation of phenomena in English used for smooth transition between words, i.e. linking phonemes r, l and w, and intrusive r, which lie in the focus of the work. In Chapter Six the main focus turns onto a text containing the above mentioned features and its analysis. The research itself is based on authentic recordings of both Czech and native English speakers reading the text. In the following part are analysed established features. In Chapter Seven the author formulates the general principles and implications for teaching methodology, which could help students of English improve their pronunciation with respect to linking and minimise the interference between the languages, manifested as an overuse of glottal stop in spoken English.
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Use of glottalization as a factor enabling speaker identification
Skákal, Ladislav ; Skarnitzl, Radek (advisor) ; Bořil, Tomáš (referee)
While handling the task of speaker identification, forensic phoneticians use a combination of various parameters contained in different levels of speech signal. The main aim of the present thesis is to explore whether glottalization in Czech may be considered as a potentially useful parameter in this sense. In our research, we focus on the rate of prevocalic glottalization at word boundaries and we distinguish between different realisations of glottalization: canonical glottal stop and its hypoarticulated form - creaky voice. The studied material consists of repeated recordings of three male and four female speakers and contains both read text and spontaneous speech. The results do not indicate that the same speaker would use glottalization differently in the first and second recording, but a difference in glottalization is found between speakers. From the forensic phonetics point of view, this finding seems to be useful. Marginally, some other factors which are not directly connected with the speaker (height of following vowel, lexical factors and speech rate) were examined, but no influence on glottalization was found. Keywords: glottal stop, glottalization, forensic phonetics, speaker identification
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Automatic detection of myocardial infarction in ECG
Nejedlý, Lukáš ; Kozumplík, Jiří (referee) ; Smíšek, Radovan (advisor)
This master’s thesis deals with the automatic detection of myocardial infarction in ECG. Semester work consists of two parts. The theoretical part provides a description of the electrical conduction system of the heart, spreading of electrical activity through the heart muscle, the methods of ECG scanning and the ECG curve. There are also mentioned the causes of myocardial ischemia and various methods of its detection. Another part is devoted to high-frequency ECG, analysis of HFQRS and clinical studies which describe the use of high-frequency ECG in diagnosis of myocardial infarction. In the practical part is proposed an algorithm using low-frequency components ECG and an algorithm using high-frequency components ECG for automatic detection of myocardial infarction. The proposed algorithms are implemented in programming environment MATLAB and tested on signals from the PTB database. The final part of the master‘s thesis is devoted to the comparison of the success of myocardial infarction by means of low frequency and high frequency components of ECG and comparison of achieved results with results from clinical studies.
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Glottalization in the combination with non-syllabic prepositions in the Czech speech of Russian speakers
Tolkunova, Yana ; Veroňková, Jitka (advisor) ; Confortiová, Helena (referee)
Glottalization, as significant irregularity of glottal pulsing, fulfils a number of linguistic functions and can occur in various contexts. This paper examines the rate of vowel-related glottalization of non-syllabic prepositions when native Russian speakers read Czech speech. In Czech, just like in other languages there is a relatively high frequency of glottalization. The purpose of this study is to examine the factors that could influence it. The speakers produced a short read text which contained 59 potential neslabičné prepositions where glottalization could occur in standard pronunciation. The basic set of the perceptual analysis and statistical processing consisted of 582 items. The rate of glottalization in individual speakers ranged from 0 % to 90 % , where the average volume is regulary based at 49 %. Statistical significance of differences in the frequency of the analyzed groups created on the basis of monitored aspects were calculated using the chi-square test.
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Use of glottalization as a factor enabling speaker identification
Skákal, Ladislav ; Skarnitzl, Radek (advisor) ; Bořil, Tomáš (referee)
While handling the task of speaker identification, forensic phoneticians use a combination of various parameters contained in different levels of speech signal. The main aim of the present thesis is to explore whether glottalization in Czech may be considered as a potentially useful parameter in this sense. In our research, we focus on the rate of prevocalic glottalization at word boundaries and we distinguish between different realisations of glottalization: canonical glottal stop and its hypoarticulated form - creaky voice. The studied material consists of repeated recordings of three male and four female speakers and contains both read text and spontaneous speech. The results do not indicate that the same speaker would use glottalization differently in the first and second recording, but a difference in glottalization is found between speakers. From the forensic phonetics point of view, this finding seems to be useful. Marginally, some other factors which are not directly connected with the speaker (height of following vowel, lexical factors and speech rate) were examined, but no influence on glottalization was found. Keywords: glottal stop, glottalization, forensic phonetics, speaker identification
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Relationship between the strength of foreign accent and the presence of glottalization
Moravcová, Jana ; Skarnitzl, Radek (advisor) ; Weingartová, Lenka (referee)
In this paper, we are interested in what the part of glottalization is in a foreign accent. We focus on Czech speakers of English and an evaluation of their utterances. Those speakers analyzed for the purposes of this paper were evaluated in advance by a perceptual test. In accordance with the results of the test, they were divided into three groups: A, containing those speakers with an English close to the native standard; C, containing speakers with a strong Czech accent; and B, containing speakers with a detectable foreign accent which, however, is not evaluated as a Czech one. The aim of this paper is to determine in what way speakers of each group use glottalization and whether the use is identical to the assumptions of the previous studies.
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