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Statistical analysis in quality management
Chlebounová, Klára ; Knobloch, Josef (referee) ; Zahálka, Jiří (advisor)
The goal of this thesis is to create a literary research on the methods of statistical data processing in the field of quality management and to make their overview along with the possibilities of using them. A practical example shows how to determine manufacturing process stability and qualification determining, using the Shewhart’s control chart and capability indexes. This methodics should serve as a guideline for manufacturing process evaluation. As a brief summary of generally used statistical data processing methods, this thesis should serve all, who are engaged in quality management.
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Design of inspection procedure for selected revolver components
Úlehlová, Eva ; Šrámek, Jan (referee) ; Jankových, Róbert (advisor)
The goal of this master’s thesis was design of the inspection procedure for hammer and trigger of the specific revolver model. Thesis was developed in cooperation with the manufacturer of the revolvers. The theoretical part deals with the MSA methodology, which is used to assess acceptability of measurement systems. The practical part describes the current measurement system and performs gage repeatability and reproducibility study. It was confirmed that the current measurement system requires improvement. Subsequently coordinate systems were designed, based on functional features of the hammer and trigger. Automated optical measurements, based on the coordinate systems, were performed. The results from these measurements were again assessed by the gage R&R study. The analysis confirmed improvement of acceptability of the designed measurement systems. Based on these results, it is recommended to apply suggested procedures in practice. Results and recommendations of this master’s thesis can contribute to develop metrology in the company and improve the existing measurement system.
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Design of experiments for quality optimization
Havlásek, Radim ; Kosina, Petr (referee) ; Novotný, Radovan (advisor)
This thesis is aimed to Design of Experiments methodology. Main purpose of this thesis is to create detailed materials for lessons of Design of Experiments in Quality Control courses. Thesis contains case studies which are applicable for education purposes. Design of Experiments has been applied for solder joints quality evaluation. Solder joints have been modeled in software ANSYS and finite element method has been applied for thermomechanical stress evaluation.
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Selected random variables transformations used in classical linear regression
Tejkal, Martin ; Michálek, Jaroslav (referee) ; Hübnerová, Zuzana (advisor)
Klasická lineární regrese a z ní odvozené testy hypotéz jsou založeny na předpokladu normálního rozdělení a shodnosti rozptylu závislých proměnných. V případě že jsou předpoklady normality porušeny, obvykle se užívá transformací závisle proměnných. První část této práce se zabývá transformacemi stabilizujícími rozptyl. Značná pozornost je udělena náhodným veličinám s Poissonovým a negativně binomickým rozdělením, pro které jsou studovány zobecněné transformace stabilizující rozptyl obsahující parametry v argumentu navíc. Pro tyto parametry jsou stanoveny jejich optimální hodnoty. Cílem druhé části práce je provést srovnání transformací uvedených v první části a dalších často užívaných transformací. Srovnání je provedeno v rámci analýzy rozptylu testováním hypotézy shodnosti středních hodnot p nezávislých náhodných výběrů s pomocí F testu. V této části jsou nejprve studovány vlastnosti F testu za předpokladu shodných a neshodných rozptylů napříč výběry. Následně je provedeno srovnání silofunkcí F testu aplikovaného pro p výběrů z Poissonova rozdělení transformovanými odmocninovou, logaritmickou a Yeo Johnsnovou transformací a z negativně binomického rozdělení transformovaného argumentem hyperbolického sinu, logaritmickou a Yeo-Johnsnovou transformací.
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Quality management tools
Zachová, Zuzana ; Levek, Vladimír (referee) ; Novotný, Radovan (advisor)
This bachelor thesis deals with methods, and above all with quality management tools. It consists of four parts. In the first part of the thesis is briefly presented the history of approaches to quality management. In the second part, a basic overview of the seven basic tools for quality control is elaborated and in the case of those tools, which are statistical, the procedure of their construction in Minitab is outlined. In the third part are processed advanced statistical tools with a focus on the analysis of the measurement system. In the fourth, practical part, selected methods of analysis of the measurement system are analyzed by case studies.
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Key factors of financing small companies in early stages within digital economy services in Visegrad 4 member countries
Amankwaa-Opoku, Walter
This thesis focuses on achieving the objectives of identifying the key factors of efficient financing of small companies active in the digital economy services settled in Visegrad 4 member countries within their early life stage phases. These Visegrad 4 member countries include the Czech Republic, Slovakia, Poland, and Hungary. Many works of literature were reviewed in achieving this objective, these pieces of literature include literature on small companies in Visegrad 4-member countries, financing of small companies in Visegrad 4-member countries, literature on Altman Z-score and other bankruptcy models, and literature on non-financial factors that influence SMEs bankruptcy. The thesis was both qualitative and quantitative in nature and analyses were done on the financial statements and non-financial factors of sampled SMEs in the 4 Visegrad countries. Various analyses were undertaken to arrive at this objective, these analyses include analyzing the descriptive statistics, determining the Correlation Matrix, running the ANOVA test to determine the significance level of the key factors in determining the performance of these SMEs and consequently influencing their financing level and also analyzing selected non-financial factors readily available.
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Determination of elements in human hair
Gazda, Vojtěch ; Nováková, Eliška (advisor) ; Červený, Václav (referee)
The bachelor thesis is focused on the determination of selected elements in human hair. For the determination of 13 samples, a procedure for their digestion with concentrated HNO3 and elemental analysis using inductively coupled plasma mass spectrometry ICP-MS was proposed. The results were compared with other sources, if the cited works reported the geographical origin of the sample, the differences in our population are compared with the population in another country. The concentrations of heavy metals that were determined were not particularly different from the others, with the exception of Pb, here it was found that in the area where the samples were taken the concentration of Pb in hair is low and this finding shows that the people from whom the samples come are not exposed to Pb from the environment and work environment and from food and water. Subsequently, the samples were found to contain more Mg, Sr, Ni, Ba and Au compared to others reported in the literature. The next objective was to determine if the concentrations differed between the sexes. Men were found to have higher concentrations of K than women, while women's hair was found to contain almost 12 times more Ca and Mg than men's hair. Therefore, in order to prove whether there was a statistical difference between the...
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Difference of biomechanical parameters in individual categories in javelin throw
Krejnusová, Tereza ; Feher, Jan (advisor) ; Hojka, Vladimír (referee)
Title: Difference of biomechanical parameters in individual categories in javelin throw Objectives: The aim of this work is to determine whether the biomechanical parameters in javelin throw are different between age categories and gender categories. At the same time, this work deals with how much influence the individual parameters affect the throw distance and whether these ratios are the same or different for each category. Methods: During the research, kinematic analysis and video analysis using the Kinovea program were used. Statistical methods such as ANOVA, Tukey's post hoc analysis and hierarchical regression analysis were also used. Results: It was found that of the measured parameters, the value of 8 parameters differs between at least two categories. Only 2 parameters gave an insignificant result, so there are no different values between the categories. Furthermore, it was found that for 3 categories, the net distance has the greatest effect on the rate of estimation. The other selected parameters are only partially identical and there are some differences between the categories.. Keywords: javelin throw, biomechanical parameters, difference, category, ANOVA, hierarchical analysis
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Evaluation of results using different methods of experimental measuring of blood pressure amongst students of the First Faculty of Medicine of the Charles University
Sova, Jan ; Kymplová, Jaroslava (advisor) ; Jirsa, Jan (referee)
During the projects from biophysics of freshman students of the Faculty of Medicine the pressure measurement is run by several different methods; palpation, auscultatory and digital method. Students are learning to record the measurement in a systematic way, and they are learning to compare the results of every method to each other. The measurement of systolic and diastolic pressure are dependent on each other of course, as well they are dependent on the set of biometric and other information that is well available in healthy students (sex, height, weight, physical strain etc.). The aim of the thesis is to compare the results acquired by the methods of measurement mentioned above, related to the accuracy of the scattering of the measurement and related to the anticipated standard values of healthy individuals. The basis of the thesis is going to be project and creation of the regression model for the levels of systolic/diastolic pressure measured out that is dependent on biometric data along with the testing of statistical importance of parametres through the procedure of multifactorial ANOVA for the repeated measurement. The result will aim to show both advantages and disadvantages of different methods of the pressure measurement during accordingly varying conditions of experiments. The thesis...
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