136 results on '"Zámková, A."'
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2. The arising of ferromagnetism in Al-doped Mn2(Ga1−xAlx)C MAX phases
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Zhandun, Vyacheslav S., Zamkova, Natalia G., and Draganyuk, Oksana N.
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- 2024
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3. Magnetic structure and pressure-induced spin-crossover in Me3B2O6 (Me = Mn, Fe, Co, Ni) kotoites: Representation analysis and DFT calculations
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Zhandun, Vyacheslav S., Draganyuk, Oksana N., and Zamkova, Natalia G.
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- 2024
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4. Is there any hidden symmetry in the stripe structure of perovskite high temperature superconductors?
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Gavrichkov, Vladimir A., Shanko, Yury, Zamkova, Natalia G., and Bianconi, Antonio
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Condensed Matter - Superconductivity - Abstract
Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles and nanoscale phase separation in doped perovskites.It is known that the striped phases in doped perovskites are due to competing interactions involving charge, spin and lattice degrees of freedom,but while many theoretical models for spin and charge stripes have been proposed we are missing theoretical models describing the complex lattice striped modulations in doped perovskites. In this work we show that two different stripes can be represented as a superposition of a pair of stripes, U(theta_n) and D(theta_n), characterized by perovskite tilts where one of the pair is rotated in relation to the other partner by an angle Delta(theta _n)=pi/2. The spatial distribution of the U and D stripes is reduced to all possible maps in the well-known mathematical four-color theorem. Both the periodic striped puddles and random structures can be represented by using $planar$ graphs with a chromatic number. To observe the colors in mapping experiments, it is necessary to recover variously oriented tilting effects from the replica. It is established that there is an interplay between the annihilation/creation of new stripes and ordering/disordering tilts in relation to the theta _n angle in the CuO2 plane, where the characteristic shape of the stripes coincides with the tilting-ordered regions. By their origin, the boundaries between the stripes should be atomically sharp., Comment: 6 pages, 4 figures
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- 2019
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5. Lattice distortions and/or intercalation as ways to induce magnetism in a-FeSi2: a theoretical study
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Zhandun, V., Zamkova, N., Korzhavyi, P., and Sandalov, I.
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Condensed Matter - Strongly Correlated Electrons - Abstract
The possibilities to induce magnetism in the non-magnetic bulk alpha-FeSi2 by means of lattice distortions or intercalation with metal or non-metal ions of light elements is investigated theoretically by combined ab initio and model methods. We find that the distortions indeed can induce the formation of magnetic moment on iron atoms in certain local environments; however, the required strength of the distortions often is too large to be achieved in experiments. For this reason we suggest using "chemical pressure" that is, intercalating the alpha-FeSi2 films by light elements. We find that some of such variants have promising characteristic., Comment: 11 pages, 11 figures
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- 2018
6. Effect of substitution of Mn and Ga atoms by Fe atom in the Mn2GaC MAX phase
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Draganyuk, Oksana N., Zamkova, Natalia G., and Zhandun, Vyacheslav S.
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- 2022
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7. National Labelling System of Organic Agriculture and Food Products—How Familiar Are Czech Consumers with the National Organic Agri-Food Brand?
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Martina Zámková, Stanislav Rojík, Martin Prokop, Simona Činčalová, and Radek Stolín
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agri-food marketing ,agribusiness and food trade ,consumer behaviour and consumption ,national labelling system of organic agriculture and food products ,sustainable agriculture and food production ,organic agriculture and farming ,Agriculture (General) ,S1-972 - Abstract
The organic market in the Czech Republic has been growing dynamically, mainly in the last two decades. It is increasing the number of organic farms and producers of organic food. It was also identified as growing in popularity with Czech customers in the period before the COVID-19 pandemic. In the Czech Republic, organic products are labelled with a national brand called “bio zebra” under direct control of the Czech Ministry of Agriculture. The dependence of the recognition of this brand on selected socio-demographic indicators (gender, age, education, net monthly household income, number of household members, number of children in the family, size of the municipality) was evaluated in a sample of 1197 respondents in total using logistic regression, and the course of partial dependence on individual sociodemographic indicators was monitored in more detail using contingency table analysis. Significant relationships were found between the recognition of this agri-food brand and gender, education, net monthly household income, number of members and children in the family, and size of the municipality where the consumers live. The proportion of respondents who know the label was higher among women and increased with education level, net monthly household income, number of household members and municipality size.
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- 2024
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8. The Factors Influencing the Mathematics Exam Success Rate in the Study Programmes Taught at the College of Polytechnics Jihlava (2006-2015)
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Zámková, Martina, Prokop, Martin, and Stolín, Radek
- Abstract
This paper addresses the exam success rates in Mathematics 1 at the College of Polytechnics in Jihlava (CPJ). Primary data taken from the school information system cover the years 2006--2015. We carried out a success rate analysis based on several criteria (form of study, the reason for termination of studies, gender). We observed the dependence of the success rate on the aforementioned criteria and time. Plus a detailed analysis of the success rate with respect to the study programme was conducted. The contingency tables analysis and correspondence analysis were used to assess the dependencies. The research showed that the success rate in Mathematics 1 has been decreasing over the course of the monitored period of time. The success rate of full-time students is higher compared to the part-time students. Women have higher success rate than men. The respective study programmes showed equivalent results. Technical study programmes show lower success rate in mathematics. The research furthermore implies that mathematics may not always be the cause of a complete termination of studies. To reverse the trend of the growing failure rate we introduced an entrance test of high school basic mathematics followed by a course for those who fail at this test. As a part of our currently running project, our school have been innovating the e-learning modules and working on the textbooks for Seminar in Mathematics that may be completed in a form of an intensive summer or winter school in mathematics. This project's objective is an overall improvement of students' mathematical knowledge and skills.
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- 2016
9. Self-consistent mapping: Effect of local environment on formation of magnetic moment in alpha-FeSi2
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Zhandun, V. S., Zamkova, N. G., Ovchinnikov, S. G., and Sandalov, I. S.
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Condensed Matter - Materials Science - Abstract
We suggest here the method of the mapping of DFT calculations on the multiorbital model in a following way: the parameters of the formulated multiorbital model should be determined from the requirement that the self-consistent charge and spin densities found from the ab initio and model calculations have to be as close to each other as possible. The analysis of the model allows for detailed understanding of the role played by different parameters of the model in the physics of interest. As an example of the approach we present the study of the effect of silicon atoms substitution by the iron atoms and vice versa on the magnetic properties in the iron silicide alpha-FeSi2. The DFT+GGA calculations are mapped to the model with intraatomic Coulomb and exchange interactions, hoppings to nearest and next nearest atoms and exchange of the delocalized electrons between iron atoms; the magnetic moments on atoms and charge densities of the material are found self-consistently within the Hartree-Fock approximation. We find that while the stoichiometric alpha-FeSi2 is nonmagnetic, the substitutions generate different magnetic structures. For example, the substitution of three Si atoms by the Fe atoms results in the ferrimagnetic structure whereas the substitution of four Si atoms by Fe atoms gives rise to either the nonmagnetic or the ferromagnetic state depending on the type of local enviroment of the substitutional Fe atoms. Besides, contrary to the commonly accepted statement that the destruction of the magnetic moment is controlled only by the number of Fe-Si nearest neighbors, we find that actually it is controlled by the Fe-Fe next-nearest-neighbors. This finding led us to the counterintuitive conclusion: an increase of Si concentration in Fe1-xSi2+x ordered alloys may lead to a ferromagnetism. This conclusion is confirmed by the calculation within GGA-to-DFT.
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- 2016
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10. Effect of local environment on moment formation in iron silicides
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Zamkova, N. G., Zhandun, V. S., Ovchinnikov, S. G., and Sandalov, I. S.
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Condensed Matter - Materials Science - Abstract
The effect of local environment on the formation of magnetic moments on Fe atoms in iron silicides are studied by combination of ab initio and model calculations. The suggested model includes all Fe d- and Si p-orbitals, intra-atomic Coulomb interactions, inter-atomic Fe-Fe exchange and hopping of electrons to nearest and next nearest neighboring atoms and takes into account all symmetries within the Slater-Koster scheme. The parameters of the model are found from the requirement that self-consistent moments on atoms and density of states found from ab initio and model calculations within the Hartree-Fock approximation are close to each other as much as possible. Contrary to the commonly accepted statement that an increase of the Si concentration within nearest environment of Fe atoms in the ordered Fe3Si and FexSi1-x alloys leads to a decrease of Fe magnetic moment we find that a crucial role in the formation of magnetic moments is played by second coordination sphere of Fe atoms. Particularly, the Fe atoms have higher magnetic moments in amorphous films compared to the epitaxial ones due to decrease in the number of iron-atoms in the next nearest environment. Both our model and ab initio calculations confirm existence of known spin crossover with pressure and predict second crossover at higher pressure, Comment: 13 pages, 5 figures
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- 2016
11. Half-metallicity in Fe2MnSi and Mn2FeSi heusler compounds: A comparative ab initio study
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Draganyuk, Oksana N., Zhandun, Vyacheslav S., and Zamkova, Natalia G.
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- 2021
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12. Quasiparticles in Iron Silicides: GW versus LDA
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Zamkova, Natalie, Zhandun, Vyacheslav, Ovchinnikov, Sergey, and Sandalov, Igor
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Condensed Matter - Materials Science - Abstract
The angle-resolved photoemission spectroscopy, ARPES, is able to measure both the spectra and spectral weights of the quasiparticles in solids. Although it is common to interpret the band structure obtained within the density-functional-theory based methods as quasi-particle spectra, these methods are not able to provide the changes in spectral weights of the electron excitations. We use Vienna Ab initio Simulation Package, VASP, for evaluation of the quasiparticle spectra and their spectral weights within Hedin GW approximation for Fe3Si and FeSi2, providing, thus, a prediction for the ARPES experiments. Comparison of the band structures shows that both theories reflect peculiarities of the crystal structures in similar shape of the bands in certain k-directions, however, in general the difference is quite noticeable. We find that the spectral weight of quasiparticles in these compounds deviates from unity everywhere and shows non-monotonic behavior in those parts of bands where the delocalized states contribute to their formation. Both methods lead to the same conclusion: those of iron ions in Fe3Si which occupy the positions, where they are surrounded by only Fe ions, have the d-electrons localized and large magnetic moment whereas Fe ions with the Si nearest neighbors have d-electrons delocalized and the magnetic moments quenched. The Si influence on the Fe ion state is even more pronounced in the FeSi2 where all iron ions have the Si ions as nearest neighbors: both approaches produce zero moment on iron ions. The advantages and disadvantages of both approaches are discussed., Comment: 10 pages, 6 figures
- Published
- 2015
13. Consumers’ Behavior in the Field of Organic Agriculture and Food Products during the COVID-19 Pandemic in the Czech Republic: Focus on a Comparison of Hyper-, Super- and Farmers’ Markets and Direct Purchases from Producers
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Martina Zámková, Stanislav Rojík, Martin Prokop, Simona Činčalová, and Radek Stolín
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food customers’ behavior ,organic agriculture and food products ,organic farming ,agricultural value chain ,sustainable logistics chain ,sustainable development of rural areas ,Agriculture (General) ,S1-972 - Abstract
The aim of this paper is to assess Czech food consumers’ behavior when buying organic products during the COVID-19 pandemic, with an emphasis on the place of purchase of organic agriculture and food products—especially those purchases with the shortest logistics value chain, i.e., purchase at farmers’ markets, or directly from the producer—and a comparison with the current most common places of purchase of organic products in the Czech Republic, supermarkets and hypermarkets. Categorical data analysis methods were used to create a profile of the consumer according to the most frequent purchase locations. To create mathematical–statistical models and interpretations, the methods of logistic regression, correspondence analysis and contingency table analysis were chosen. According to the results of the survey, respondents under 25 years of age are the least likely to make purchases at farmers’ markets or directly from the producer. Consumers aged 26–35 and with a university degree are the most likely to buy organic agriculture and food products at this location, followed closely by older respondents in the categories 36–45 and 46+ and with a secondary education. It is important for manufacturers to have an overview of where, in what quantities, and for what reasons consumers buy their products, especially for reasons of production optimization and planning, ecological concerns, rural development, and the impact on local areas and the value chain.
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- 2023
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14. Non-Parametric Anova Methods Applied on Students' Performance Development in Course of Statistics
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Martina Zámková, Martin Prokop, and Radek Stolín
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College of Polytechnics Jihlava ,statistics ,success rate ,Mann-Whitney U test ,Kruskal-Wallis test ,non-parametric tests ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
This study intends to use non-parametric statistical methods for comparison of mean values in assessing the changes of overall grades in basic statistics at the College of Polytechnics in Jihlava. The data covering students' grades were transferred to the ordinal scale and evaluated with the use of the corresponding non-parametric statistical methods, due to failing the data normality test. In order to identify statistically significant grade differences over the years 2006–2018, we have used the test of equality of means as well as the relevant analyses of variance, i.e. the Mann-Whitney U test to compare two samples, the Kruskal-Wallis test to compare multiple samples, and the post hoc analysis. All tests that were carried out confirm that on average, women and Finance and Management students tend to achieve better grades in statistics, as opposed to men, and Travel and Tourism students. Mean grades have rather fluctuated over the years. In the beginning (2006–2009) and in the end (2014–2017) of the observed period the grades have been significantly superior to the grades in the in-between stage (2010–2013). The identified fluctuation in grades shall lead to implementation of measures aimed at achieving an overall increase in statistics' education quality and students' grades.
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- 2020
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15. National Labelling System of Organic Agriculture and Food Products—How Familiar Are Czech Consumers with the National Organic Agri-Food Brand?
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Zámková, Martina, primary, Rojík, Stanislav, additional, Prokop, Martin, additional, Činčalová, Simona, additional, and Stolín, Radek, additional
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- 2024
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16. Pre-COVID-19 Organic Market in the European Union—Focus on the Czech, German, and Slovak Markets
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Stanislav Rojík, Martina Zámková, Martina Chalupová, Ladislav Pilař, Martin Prokop, Radek Stolín, Karel Malec, Seth Nana Kwame Appiah-Kubi, Mansoor Maitah, Paweł Dziekański, and Piotr Prus
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consumer behaviour ,organic products ,foreign ,domestic and regional production ,Czech Republic ,Slovakia ,Agriculture (General) ,S1-972 - Abstract
This article compares attitudes to buying organic food in selected countries in Central Europe. The current research was conducted in 2019 on a total sample of 2800 respondents in the Czech Republic, Slovakia (Central Europe, with a relatively new organic food market), and Germany (a traditional Western Europe country with a mature food market). The study results demonstrate significant differences between the three selected markets. The product quality is the most important for German consumers. Slovak consumers consider organic food to be the least recognizable and least promoted of all the regions surveyed, and they are also the least likely to encounter targeted advertising for organic products. Germany is the country where most respondents regularly or occasionally buy organic food. In Slovakia, an interesting finding is the highest proportion of respondents who do not buy organic food at all. Czech respondents often buy organic products in specialized shops and like to grow organic products themselves. The results also suggest that Slovak consumers slightly more often prefer foreign organic products to the local ones, whereas consumers in Germany select regional organic products more often and prefer to buy regional products at farmers’ markets.
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- 2022
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17. Effect of local environment on moment formation in iron silicides
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Zamkova, N.G., Zhandun, V.S., Ovchinnikov, S.G., and Sandalov, I.S.
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- 2017
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18. A Profile of the Organic Produce Consumer
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Martina Zámková, Martin Prokop, and Radek Stolín
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organic produce ,organic food ,consumer profile ,organic farming ,test of independence ,correspondence map ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
Our paper explores the factors influencing the consumers who buy organic food. Analysis of these factors enabled us to sort the consumers into groups based on their gender, age, education, and other identifiers. Further research then revealed more detailed shopping preferences of each one of those groups. The findings generated recommendations for producers and organic produce vendors on the best way to provide target marketing for different groups of consumers and therefore increase their sales of organic produce and food made from organic produce. Considering the use of categorical data, contingency tables and correspondence maps served as the best representation and processing tools. Data analysis showed that organic produce is most frequently purchased by respondents in the age of 45+ years, who also tend to spend more money for this range of products. At the same time, these would be the respondents, who struggle the most when recognizing organic produce and who have often never seen any advertisement for it. The respondents aged 25 years and less tend to purchase organic produce least frequently; they also often do not care about the origin of organic produce. Almost the same applies to families with multiple children. However, young respondents often grow their own organic produce. There is still a not insignificant percentage of consumers, who consider organic produce to be expensive and who do not believe in their qualities. As it turns out, when it comes to organic produce the respondents purchase most frequently fruits and vegetables, milk and dairy products.
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- 2018
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19. Customer Preferences for Organic Agriculture Produce in the Czech Republic: 2016 and 2019
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Martina Zámková, Stanislav Rojík, Ladislav Pilař, Martina Chalupová, Martin Prokop, Radek Stolín, Paweł Dziekański, and Mansoor Maitah
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conventional agriculture ,consumer preferences ,Czech food market ,organic agriculture ,sustainable agriculture ,Agriculture (General) ,S1-972 - Abstract
The article analyses the customer attitude towards the qualities and benefits of organic agriculture production for farmers and customers in the Czech Republic, comparing the situation in 2016 and 2019. More than 2500 respondents were subject to the marketing research in the years 2016 and 2019. The data were processed using correspondence analysis and logistic regression. The research study shows that the number of respondents who consider organic food is growing; at the same time, there is a rather large share of consumers who believe organic food to be of better quality. The results show a favourable change in the popularity of organic food. While, in 2016, the main decisive factor in shopping for organic food was its price, in 2019, the main criterion, for the respondents, was quality, with the criterion of price being complemented by the perception of organic food as healthier than conventional food. At the same time, it was established that, the amount spent on organic food in 2019 was higher than that in 2016. This finding was in positive correlation with the increase in respondents’ income. For farmers, organic farming is a promising alternative to conventional agriculture due to a rising demand for organic produce.
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- 2021
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20. Factors Influencing Flight Delays of a European Airline
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Martina Zámková, Martin Prokop, and Radek Stolín
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flight delays ,delay causes ,European region ,correspondence analysis ,contingency tables ,chi‑squared test ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
The main aim of the paper was to investigate factors influencing flight delays of a European airline. Besides the identification and analysis of those factors the paper offers possible suggestions on how to eliminate the delays. The research is based on data acquired over the period of time spanning from June to September in 2008 – 2014. Analysis of contingency tables, including Pearson’s chi‑squared test, has been used for data processing. The dependencies have been presented in graphical form by using correspondence maps. The proportion of delayed flights reaches approx. 50 % during nearly the entire monitored period only in September the proportion drops to 45 %. Flight delays are most frequently caused by delays of previous flights of the same plane. These previous delayed flights are the main culprit of long delays and the frequency of delay occurrence caused by this reason increases significantly during the day. Longer delays of flights appear also due to technical maintenance or aircraft defects. On the contrary other factors such as operational control and crew duty norms, air traffic control and airport limitations tend to cause rather shorter delays of flights with the air traffic control encountering more problems with coordination of flights in the early morning. The supply and service companies also manage to eliminate long delays.
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- 2017
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21. The Evaluation of Factors Influencing Flights Delay at Czech International Airports
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Martina Zámková and Martin Prokop
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flights delay ,airlines delay codes ,international airports ,Czech Republic ,correspondence analysis ,contingency tables ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
The main goal of this article was examination of factors influencing flights delay at three most important international airports in Czech Republic. Data of selected Airlines operating in Czech Republic, whose flights are mainly oriented to international airports in Prague, Brno and Ostrava, were used for needs of this article. Analysis of contingency tables including Pearson chi-squared test was used for data processing. Dependences were presented in graphical form by correspondence analysis. Results from analysis showed that delay caused by technical reasons and maintenance is the most frequent in Prague as well as delay caused by high concentration of airspace, operational management and crew duty norms. Problems caused by departure delay from previous destination are significantly more frequent in Brno and Ostrava by reason of small number of alternative available aircraft. Delays caused by supplier (handling, catering, …) are mostly short, in particular by reason of potential penalty. Delays caused by technical problems and necessary maintenance service last mostly longer time and are more frequently on aircraft of type Boeing. Delays of borrowed aircraft of type Airbus are more frequently caused by rental and control of this aircraft by other companies which causes communication and planning difficulties.
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- 2015
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22. Factors Affecting the International Flight Delays and Their Impact on Airline Operation and Management and Passenger Compensations Fees in Air Transport Industry: Case Study of a Selected Airlines in Europe
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Martina Zámková, Stanislav Rojík, Martin Prokop, and Radek Stolín
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airline operation and management ,management and strategy ,marketing and quality of the services ,passengers and customers satisfaction ,air transport economics ,flight delays compensation ,Europe ,correspondence analysis ,Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Building and Construction ,Management, Monitoring, Policy and Law - Abstract
This paper aims to analyze the causes of flight delays of a selected airline operating in Europe and identify potential risks and reasons for delays in air transport, which carry risk, especially in connection with passenger dissatisfaction and the resulting need to pay compensation for delayed flights, according to EU law, which brings significant financial costs for airlines. Data collected from the years 2013–2019 have been used for the purposes of this article, including data on the duration and causes of the delays and the characteristics of individual flights, such as the flight type, aircraft type, time of departure, aircraft capacity, and the load factor. Multidimensional statistics methods have been applied for data processing, namely tests of independence and correspondence analysis. Dependencies have been presented in graphical form using correspondence maps. The analysis shows that the total share of delayed flights of the company in question does not increase over the mentioned period of time. The analysis furthermore proved that higher capacity aircraft were rather prone to longer delays. The share of delayed charter flights declined slightly over the period under review, while the number of delays caused by airline operating reasons, aircraft clearance by supplier companies, technical maintenance and aircraft defects, operating procedures, and crew flight standards and airport restrictions is increasing. The analysis also shows that the delays propagated by the delays of the previous flights are becoming more frequent, with the exception of the year 2019. In the last pre-COVID year, air traffic control could boast about a positive trend regarding the number of produced delays over the years, contributing to greater air passenger satisfaction and airline service quality. Due to the gradual revival of air transport after the COVID pandemic lockdowns, the topic of flight delays, passenger customer satisfaction and financial costs for the resulting delays is once again an actual issue for air management and operation.
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- 2022
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23. Flight Delay Causes at Selected Visegrad Group International Airports
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Martin Prokop, Radek Stolín, Luboš Střelec, and Martina Zámková
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Marketing ,Economics and Econometrics ,Flight delay ,Aeronautics ,Management of Technology and Innovation ,Business ,Business and International Management ,European region ,Finance ,Management Information Systems - Abstract
The aim of this article is to analyse the flight delay causes at base airports (Prague, Brno, Ostrava, Budapest, Bratislava, Katowice, and Warsaw), with a special focus on a selected airline company operating in the central European region. To process the data, methods of multivariable statistics, namely tests of independence in contingency tables, the Kruskal-Wallis testing, cluster analysis, and correspondence analysis were used. Apparently, both charter and scheduled flights have the same percentage of delayed flights, delays occur most frequently in June, and Boeing 737-800 reported delays more frequently than Airbus A320. The research has shown that the highest number of delayed flights occurs in Budapest, the lowest number in Katowice. During the night, short delays occur most often, long delays most frequently arise in the evening. The most common cause for longer delays is technical maintenance or an aircraft defect and previously delayed flights. The flight dispatch by supplier companies is the source accounting only for rather short delays. Overall, the delayed flights frequency increases with the size of the city and the airport.
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- 2021
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24. Factors Affecting the International Flight Delays and Their Impact on Airline Operation and Management and Passenger Compensations Fees in Air Transport Industry: Case Study of a Selected Airlines in Europe
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Zámková, Martina, primary, Rojík, Stanislav, additional, Prokop, Martin, additional, and Stolín, Radek, additional
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- 2022
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25. Czech Consumers’ Preference for Organic Products in Online Grocery Stores during the COVID-19 Pandemic
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Zámková, Martina, primary, Rojík, Stanislav, additional, Prokop, Martin, additional, Činčalová, Simona, additional, and Stolín, Radek, additional
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- 2022
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26. Comparison of Consumer Behavior of Slovaks and Czechs in the Market of Organic Products by Using Correspondence Analysis
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Martina Zámková and Martin Prokop
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organic products ,shopping patterns ,marketing research ,contingency tables ,correspondence analysis ,dependence analysis ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
This article aims to collect information related to organic farming. It also deals with the assessment and comparison of shopping behaviour in the organic food market in the Czech and Slovak Republics. Respondents from the Czech Republic and the Slovak Republic were addressed within the marketing research - survey and potential factors that could affect young people when buying organic products were formulated. There were also established recommendations to retailers of organic products on how to promote the sales of this item to the young generation of Czechs and Slovaks.For statistical data processing we used correspondence analysis and contingency tables analysis. Correspondence analysis is a multivariate statistical technique. The graphical representation of results from correspondence analysis is commonly done with so-called symmetric maps. Based on the results the target groups for marketing strategy were identified and proposals to increase the frequency of buying organic food were formulated.It has been proven in the Czech and the Slovak Republic that there is a negligible amount of young respondents who buy organic food regularly (less than 8%), and therefore it is necessary to change the existing marketing strategy and support the sale of this item.
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- 2014
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27. The differences in the marketability of organic products in Greece and the Czech Republic
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Martina ZÁMKOVÁ and Veronika BLAŠKOVÁ
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bio products (organic products) ,ecological agriculture ,organic farming ,shopping patterns ,statistical data processing ,Agriculture - Abstract
The paper is concerned with the marketability of organic products in Greece and the Czech Republic. We use marketing research in the form of a questionnaire survey to get an understanding of the organic-product shopping patterns in both countries. The data collected are then analysed by statistical methods and the differences presented between the marketability of organic products in Greece and the Czech Republic. In comparing the results, a chi-square test is used to test for their independence, further using a simple as well as multiple-sample testing of relative frequencies. Based on the results, there are then presented recommendations to producers and traders of organic products to support the popularity of this group of products and thereby to increase the marketability especially among the younger generation of consumers.
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- 2013
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28. Consumers behaviour of students when shopping for organic food in the Czech Republic
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Martina Zámková and Martin Prokop
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organic products ,shopping patterns ,contingency tables ,correspondence analysis ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
Organic farming and organic food are terms that attract the attention of not only farmers, but also economists. It is paper, which could address many consumers in the future. A healthier way of life is becoming more and more popular. This paper primarily aims to collect basic knowledge of organic farming, organic food and its labelling. Furthermore, according to conducted marketing research (1.289 respondents were addressed in questionnaire survey), it is aim to characterize the factors that influence respondents when buying organic food. Based on the results of research another goal is to identify the main factors that could make the younger generation of Czechs buy organic food more frequently. Then according to the statistical data processing this paper aims to formulate recommendations to producers and traders of organic products to entice young people to become customers of this article for many years. Next goal is to compare the results with some other European countries. Interesting relationship between frequency of organic food purchases and other indicators will be assessed by using analysis of contingency tables. An intention is also to identify the target group for marketing strategies. What the respondents most often link with various organic labelling will be identified by using correspondence analysis of monitored data and better flows of information will be proposed.It is clear from the research that organic food is most often bought by women and respondents with higher level of household life. It is purchased mainly fruit and vegetables, as well as dairy products. Respondents mostly make their purchases of organic food in hypermarkets and supermarkets. In addition to the primary reason of disinterest in buying organic food, which is the price, respondents also don’t believe that organic food is better than conventional food and it is not attractive for them.
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- 2013
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29. Factors affecting students’ attitude towards introduction of tuition fees for higher education in the Czech Republic
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Martina Zámková and Veronika Blašková
- Subjects
marketing research ,immediate tuition fees ,delayed tuition fees ,student loans ,university ,Czech Republic ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
Introduction of tuition fees has been much discussed in the Czech Republic over the recent years. Unfortunately, the current system of non-discriminate higher-education funding is no longer supportable, that is, provided that we do not want all universities to be evenly “mediocre”. A well configured tuition-fee system with low payments, suitably complemented by student loans covering not only the tuition fees but also the subsistence costs could be an acceptable vision of the future higher education. The obligation to pay for the study should also prevent from enrolment those applicants that only enter a university to avoid having to cater for themselves in real life. A survey was conducted to find out the views of Czech university students on the introduction of tuition fees and the possible methods of their payment. A subsequent analysis was made to see whether the introduction of tuition fees would aggravate students’ financial situation, whether they would be more motivated to complete the studies in due time, and whether they would be more concerned with the quality of teaching. The survey also analysed the relationship between a respondent’s view on the introduction of tuition fees and the current methods of financing the studies (accommodation, transport, meals, textbooks, …), the household income, and the gender. It also takes into account the attitude of respondents on the system of student loans proposed. In order to interpret the results correspondence and dependence analysis were used.
- Published
- 2013
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30. The popularity of organic products among young people in the Czech Republic
- Author
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Martina Zámková and Veronika Blašková
- Subjects
organic products ,organic farming ,shopping patterns ,statistical data processing ,Agriculture ,Biology (General) ,QH301-705.5 - Abstract
Organic farming and foods, which have been very promisingly evolving over the recent years, are areas of economy that are not only of interest for farmers themselves but also for economists. Recent trends in this sector indicate an ongoing increase in the demand for organic production. The first part of this paper is devoted to introducing the concept of organic farming and gathering all the factors influencing the consumer’s decisions in purchasing organic products. Based on these findings, a marketing research has been carried out. The aim of this research is to identify different shopping patterns among young males and females in the Czech Republic concerning organic products and new upcoming trends in this area. In the second part of this paper, the results of this research are summed up and used to give advice to producers and merchants of organic production on improving their marketing strategies.
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- 2012
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31. Consumers' Behavior in the Field of Organic Agriculture and Food Products during the COVID-19 Pandemic in the Czech Republic: Focus on a Comparison of Hyper-, Super- and Farmers' Markets and Direct Purchases from Producers.
- Author
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Zámková, Martina, Rojík, Stanislav, Prokop, Martin, Činčalová, Simona, and Stolín, Radek
- Subjects
CONSUMER behavior ,COVID-19 pandemic ,FARMERS' markets ,ORGANIC foods ,ORGANIC farming ,DIRECT marketing - Abstract
The aim of this paper is to assess Czech food consumers' behavior when buying organic products during the COVID-19 pandemic, with an emphasis on the place of purchase of organic agriculture and food products—especially those purchases with the shortest logistics value chain, i.e., purchase at farmers' markets, or directly from the producer—and a comparison with the current most common places of purchase of organic products in the Czech Republic, supermarkets and hypermarkets. Categorical data analysis methods were used to create a profile of the consumer according to the most frequent purchase locations. To create mathematical–statistical models and interpretations, the methods of logistic regression, correspondence analysis and contingency table analysis were chosen. According to the results of the survey, respondents under 25 years of age are the least likely to make purchases at farmers' markets or directly from the producer. Consumers aged 26–35 and with a university degree are the most likely to buy organic agriculture and food products at this location, followed closely by older respondents in the categories 36–45 and 46+ and with a secondary education. It is important for manufacturers to have an overview of where, in what quantities, and for what reasons consumers buy their products, especially for reasons of production optimization and planning, ecological concerns, rural development, and the impact on local areas and the value chain. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
32. Pre-COVID-19 Organic Market in the European Union—Focus on the Czech, German, and Slovak Markets
- Author
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Rojík, Stanislav, primary, Zámková, Martina, additional, Chalupová, Martina, additional, Pilař, Ladislav, additional, Prokop, Martin, additional, Stolín, Radek, additional, Malec, Karel, additional, Appiah-Kubi, Seth Nana Kwame, additional, Maitah, Mansoor, additional, Dziekański, Paweł, additional, and Prus, Piotr, additional
- Published
- 2022
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33. Czech Consumers’ Preference for Organic Products in Online Grocery Stores during the COVID-19 Pandemic
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Martina Zámková, Stanislav Rojík, Martin Prokop, Simona Činčalová, and Radek Stolín
- Subjects
Food Preferences ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Humans ,COVID-19 ,Supermarkets ,Consumer Behavior ,Child ,Pandemics ,consumer behavior ,organic food products ,sustainable agriculture ,food security and food safety ,human environment ,quality of life ,health behaviors ,sustainable development of rural and urban areas ,Czech Republic - Abstract
A major advantage of online organic produce shopping is the fact that it saves energy and reduces emissions otherwise generated by customers during their time spent on the road and while shopping. Organic products in general positively impact sustainability, the environment, and the regions of their origin along with the social changes in these regions and further rural development. Moreover, these products positively impact the perceived health benefits and quality of food labeled as organic. The Czech Republic has currently seen a rise in organic food purchasing and supply trends. This study maps the factors possibly influencing consumers’ decision to go shopping for organic food online. Observed factors include the following demographic characteristics of consumers (respondents): gender, age, education, household income, number of children in the household and number of household members. A total of 757 respondents from the Czech Republic from September 2020 to December 2020 took part in the research. Logistic regression, used for data processing, identified the statistically significant effects of education, income and number of household members on online purchases. These conclusions were confirmed by a detailed contingency tables analysis, including the almost monotonous trend of the dependencies, with only minor deviations in a maximum of one category. The strongest influence of some categories on the emergence of partial dependencies was found by residue analysis. The research confirmed that the frequency of online grocery shopping increases significantly with increasing education and income of respondents and decreases with increasing the number of household members. Most respondents apparently shop for groceries online because of time savings, better product choice and more convenient and easier search.
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- 2022
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34. Customer Preferences for Organic Agriculture Produce in the Czech Republic: 2016 and 2019
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Zámková, Martina, primary, Rojík, Stanislav, additional, Pilař, Ladislav, additional, Chalupová, Martina, additional, Prokop, Martin, additional, Stolín, Radek, additional, Dziekański, Paweł, additional, and Maitah, Mansoor, additional
- Published
- 2021
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- View/download PDF
35. Flight Delay Causes at Selected Visegrad Group International Airports
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Zámková, Martina, primary, Střelec, Luboš, additional, Prokop, Martin, additional, and Stolín, Radek, additional
- Published
- 2021
- Full Text
- View/download PDF
36. Structural properties and lattice dynamics of RbMnCl 3 crystal
- Author
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Vtyurin, A.N., Goryainov, S.V., Zamkova, N.G., Zinenko, V.I., Krylov, A.S., and Krylova, S.N.
- Published
- 2006
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- View/download PDF
37. Symmetry analysis of calculated vibrational spectra of Rb 2KScF 6 crystal
- Author
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Krylov, A.S., Bulou, A., Krylova, S.N., Voronov, V.N., Vtyurin, A.N., and Zamkova, N.G.
- Published
- 2006
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38. Vibrational spectra of KPb 2Cl 5 and KPb 2Br 5 crystals
- Author
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Vtyurin, A.N., Isaenko, L.I., Krylova, S.N., Yelisseyev, A., Shebanin, A.P., and Zamkova, N.G.
- Published
- 2006
- Full Text
- View/download PDF
39. Monitoring students’ success rate in college statistics with categorical data analysis
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Radek Stolín, Martin Prokop, and Martina Zámková
- Subjects
Contingency table ,Statistics ,Independence (mathematical logic) ,Subject (documents) ,Psychology ,Statistics education ,Everyday life ,Period (music) ,Correspondence analysis ,Test (assessment) - Abstract
The paper reviews the students’ success rate development trends in the course of basic statistics at the College of Polytechnics Jihlava from 2006 to 2018. The analysis confirmed a continuous downward trend in success rates over the first years, followed by a period of improvement in the last few years, unfortunately not strong enough to match the initial figures. The results have prompted certain modifications as well as the development of support measures to ensure better success rate and improved and more comprehensible approach to statistics education that would allow the students to form better relationship with the subject and understand its usefulness in everyday life. The available data were analysed using the categorical data analysis, i.e. the Pearson's chi-square test of independence in contingency tables, while the correspondence analysis served as a tool for graphical display of the sets of data.
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- 2020
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40. Characteristics of Long-Term Clients of Social Work in Municipalities in the Vysočina Region.
- Author
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Gabrielová, Jana, Dubnová, Markéta, Zámková, Martina, Černá, Martina, Řezníková, Vlasta, and Prokop, Martin
- Subjects
SOCIAL services ,SOCIAL impact ,SOCIAL workers ,SOCIAL problems ,DATA analysis - Abstract
OBJECTIVES: The paper aims to map socio-demographic indicators of long-term clients of social work in municipalities in the Vysočina Region and, in connection with this, verify whether there is a dependence between the record time length and selected socio-demographic indicators (age, sex, target group according to the prevailing social problem) for long-term clients of social work in municipalities. THEORETICAL BASE: Social work in municipalities is a vital tool to help vulnerable and disadvantaged citizens and people in an adverse social situation. Since 2014, the number of social work clients in municipalities has declined, but the work intensity with long-term clients has increased. METHODS: A quantitative analysis of 1,554 Standardised Records created by social workers of all authorised municipal offices of the Vysočina Region was performed. OUTCOMES: Based on the analysis of the obtained data, the basic socio-demographic characteristics of long-term clients are described. The research results show no statistically significant relationship between the record time length and sex. However, a statistically significant relationship between the record time length and age and between record time length and the target group was demonstrated. SOCIAL WORK IMPLICATIONS: The paper provides valuable and unique information about long-term social work clients in municipalities in the Czech Republic. [ABSTRACT FROM AUTHOR]
- Published
- 2022
41. THE FACTORS INFLUENCING THE MATHEMATICS EXAM SUCCESS RATE IN THE STUDY PROGRAMMES TAUGHT AT THE COLLEGE OF POLYTECHNICS JIHLAVA (2006–2015)
- Author
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Martin Prokop, Radek Stolín, and Martina Zámková
- Subjects
Contingency table ,Medical education ,business.industry ,mathematics ,education ,lcsh:LB5-3640 ,Education ,Test (assessment) ,Rate analysis ,lcsh:Theory and practice of education ,Vocational education ,College of Polytechnics Jihlava ,Mathematics education ,Information system ,Medicine ,lcsh:Q ,success rate ,business ,lcsh:Science ,students’ knowledge ,Mathematics - Abstract
This paper addresses the exam success rates in Mathematics 1 at the College of Polytechnics in Jihlava (CPJ). Primary data taken from the school information system cover the years 2006–2015. We carried out a success rate analysis based on several criteria (form of study, the reason for termination of studies, gender). We observed the dependence of the success rate on the aforementioned criteria and time. Plus a detailed analysis of the success rate with respect to the study programme was conducted. The contingency tables analysis and correspondence analysis were used to assess the dependencies. The research showed that the success rate in Mathematics 1 has been decreasing over the course of the monitored period of time. The success rate of full-time students is higher compared to the part-time students. Women have higher success rate than men. The respective study programmes showed equivalent results. Technical study programmes show lower success rate in mathematics. The research furthermore implies that mathematics may not always be the cause of a complete termination of studies. To reverse the trend of the growing failure rate we introduced an entrance test of high school basic mathematics followed by a course for those who fail at this test. As a part of our currently running project, our school have been innovating the e-learning modules and working on the textbooks for Seminar in Mathematics that may be completed in a form of an intensive summer or winter school in mathematics. This project’s objective is an overall improvement of students’ mathematical knowledge and skills.
- Published
- 2016
42. A review of flight delay causes at Spanish airports based on statistical analysis of categorical data
- Author
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Radek Stolín, Martina Zámková, and Martin Prokop
- Subjects
Contingency table ,Balearic islands ,Geography ,Flight delay ,Aeronautics ,government ,Statistical analysis ,Mainland ,government.political_district ,Air traffic control ,Categorical variable ,Correspondence analysis - Abstract
The central objective of this study is to explore the causes of delayed flights at Spanish airports and to examine them in further detail while taking into consideration additional factors. All the data originated from the internal database of an airline operating in the European area, widely used by Spanish airports for both regular and charter flights. Since the database consists mainly of linguistic variables, contingency tables and correspondence analysis were used for processing of the data. It was established in our research that there is a higher number of delayed flights in mainland Spain and the Balearic Islands, and lower in the Canary Islands. The most common reason for delayed flights at all airports is the propagation of the delay from previous flight, mostly on the Ibiza Island. Delays caused by the airport, air traffic control, and emergency situations are most frequent in Barcelona. At all airports the frequency of delays apparently decreases with their length, in other words – the shorter the delay, the more frequently it occurs. The longest delays are usually caused by the delay of the previous flight, and this cause seems to occur more frequently in the afternoon and in the evening, due to the propagation of delays over the course of the day.The central objective of this study is to explore the causes of delayed flights at Spanish airports and to examine them in further detail while taking into consideration additional factors. All the data originated from the internal database of an airline operating in the European area, widely used by Spanish airports for both regular and charter flights. Since the database consists mainly of linguistic variables, contingency tables and correspondence analysis were used for processing of the data. It was established in our research that there is a higher number of delayed flights in mainland Spain and the Balearic Islands, and lower in the Canary Islands. The most common reason for delayed flights at all airports is the propagation of the delay from previous flight, mostly on the Ibiza Island. Delays caused by the airport, air traffic control, and emergency situations are most frequent in Barcelona. At all airports the frequency of delays apparently decreases with their length, in other words – the shorter...
- Published
- 2019
- Full Text
- View/download PDF
43. A study of consumer shopping preferences based οn correspondence analysis and contingency tables
- Author
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Radek Stolín, Martina Zámková, and Martin Prokop
- Subjects
Contingency table ,Econometrics ,Psychology ,Correspondence analysis - Published
- 2019
- Full Text
- View/download PDF
44. Non-Parametric Anova Methods Applied on Students' Performance Development in Course of Statistics
- Author
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Zámková, Martina, primary, Prokop, Martin, additional, and Stolín, Radek, additional
- Published
- 2020
- Full Text
- View/download PDF
45. Monitoring students’ success rate in college statistics with categorical data analysis
- Author
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Zámková, Martina, primary, Prokop, Martin, additional, and Stolín, Radek, additional
- Published
- 2020
- Full Text
- View/download PDF
46. CAUSES AND FINANCIAL CONSEQUENCES OF FLIGHT DELAYS IN CZECH REPUBLIC
- Author
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Martina Zámková and Martin Prokop
- Subjects
Contingency table ,Czech ,Actuarial science ,media_common.quotation_subject ,Flight plan ,General Medicine ,Destinations ,Correspondence analysis ,language.human_language ,Excellence ,Chaining ,language ,Business ,Financial compensation ,media_common - Abstract
The article aims to analyse causes of flight delays in Czech Republic and to assess their financial consequences for airlines. Methods of multidimensional statistics were used for data processing, specifically independence tests in contingency tables and correspondence analysis. We see the biggest savings in assurance of excellence technical condition of aircraft. We would recommend idea of alternative aircraft (without flight plan) especially in case of long delays, of which the monitored airline has a large number and has to pay high financial amounts due to financial compensations for passengers. It is also possible according to our analysis to prevent longer delays by cooperation with flexible suppliers and appropriate form of penalties. Other causes of long delays were defined, but they can be hardly influenced, for example weather in destinations, transport of disabled people, necessity of treatment of passenger with healthy problems etc., these are delay reasons that doesn't mean necessity of paying out financial compensation, but they cause chaining of delays.
- Published
- 2015
- Full Text
- View/download PDF
47. Identification of factors affecting the aircraft delay in popular Greek destinations
- Author
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Veronika Blašková, Martina Zámková, and Ladislava Issever Grochová
- Subjects
Identification (information) ,Geography ,Evening ,Operations management ,Air traffic control ,Destinations ,European region ,Correspondence analysis - Abstract
The main goal of this article is to identify the factors influencing flight delays from popular Greek destinations – Kos, Chania, Corfu, Rhodes, Heraklion, and Zakynthos. An airline operating in European region was monitored. Factors were analysed by contingency tables analysis and correspondence analysis. Unique data were gained from airline’s database and contained information about various reasons of delay. The high season of years 2008-2014 was monitored. It was proved from the analysis that the most frequent delay occurs in Zakynthos. The least delays appear at the Kos airport. Big differences of delay frequencies among monitored airports are evident in the evening. Delay caused by the delayed preceding flight is the most frequent delay reason. Delays caused by the airlines and suppliers originate the least often. Delays caused by the problems at the airport and in air traffic control occur the most frequently in case of very short delays up to 15 minutes. Delayed preceding flights cause mainly longer delays at monitored airports.The main goal of this article is to identify the factors influencing flight delays from popular Greek destinations – Kos, Chania, Corfu, Rhodes, Heraklion, and Zakynthos. An airline operating in European region was monitored. Factors were analysed by contingency tables analysis and correspondence analysis. Unique data were gained from airline’s database and contained information about various reasons of delay. The high season of years 2008-2014 was monitored. It was proved from the analysis that the most frequent delay occurs in Zakynthos. The least delays appear at the Kos airport. Big differences of delay frequencies among monitored airports are evident in the evening. Delay caused by the delayed preceding flight is the most frequent delay reason. Delays caused by the airlines and suppliers originate the least often. Delays caused by the problems at the airport and in air traffic control occur the most frequently in case of very short delays up to 15 minutes. Delayed preceding flights cause mainly longe...
- Published
- 2018
- Full Text
- View/download PDF
48. The Evaluation of Factors Influencing Flights Delay at Czech International Airports
- Author
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Martin Prokop and Martina Zámková
- Subjects
Czech ,High concentration ,Operations research ,business.industry ,media_common.quotation_subject ,Control (management) ,Crew ,lcsh:S ,language.human_language ,contingency tables ,correspondence analysis ,lcsh:Agriculture ,Renting ,flights delay ,international airports ,Aeronautics ,lcsh:Biology (General) ,Service (economics) ,airlines delay codes ,language ,Business ,General Agricultural and Biological Sciences ,lcsh:QH301-705.5 ,media_common ,Czech Republic - Abstract
The main goal of this article was examination of factors influencing flights delay at three most important international airports in Czech Republic. Data of selected Airlines operating in Czech Republic, whose flights are mainly oriented to international airports in Prague, Brno and Ostrava, were used for needs of this article. Analysis of contingency tables including Pearson chi-squared test was used for data processing. Dependences were presented in graphical form by correspondence analysis.Results from analysis showed that delay caused by technical reasons and maintenance is the most frequent in Prague as well as delay caused by high concentration of airspace, operational management and crew duty norms. Problems caused by departure delay from previous destination are significantly more frequent in Brno and Ostrava by reason of small number of alternative available aircraft. Delays caused by supplier (handling, catering, ...) are mostly short, in particular by reason of potential penalty. Delays caused by technical problems and necessary maintenance service last mostly longer time and are more frequently on aircraft of type Boeing. Delays of borrowed aircraft of type Airbus are more frequently caused by rental and control of this aircraft by other companies which causes communication and planning difficulties.
- Published
- 2015
49. A review of flight delay causes at Spanish airports based on statistical analysis of categorical data
- Author
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Zámková, Martina, primary, Prokop, Martin, additional, and Stolín, Radek, additional
- Published
- 2019
- Full Text
- View/download PDF
50. On the way to better grades in mathematics at the College of Polytechnics in Jihlava
- Author
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Zámková, Martina, primary, Prokop, Martin, additional, and Stolín, Radek, additional
- Published
- 2019
- Full Text
- View/download PDF
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