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Míry podobnosti pro nominální data v hierarchickém shlukování
Šulc, Zdeněk ; Řezanková, Hana (advisor) ; Šimůnek, Milan (referee) ; Žambochová, Marta (referee)
This dissertation thesis deals with similarity measures for nominal data in hierarchical clustering, which can cope with variables with more than two categories, and which aspire to replace the simple matching approach standardly used in this area. These similarity measures take into account additional characteristics of a dataset, such as frequency distribution of categories or number of categories of a given variable. The thesis recognizes three main aims. The first one is an examination and clustering performance evaluation of selected similarity measures for nominal data in hierarchical clustering of objects and variables. To achieve this goal, four experiments dealing both with the object and variable clustering were performed. They examine the clustering quality of the examined similarity measures for nominal data in comparison with the commonly used similarity measures using a binary transformation, and moreover, with several alternative methods for nominal data clustering. The comparison and evaluation are performed on real and generated datasets. Outputs of these experiments lead to knowledge, which similarity measures can generally be used, which ones perform well in a particular situation, and which ones are not recommended to use for an object or variable clustering. The second aim is to propose a theory-based similarity measure, evaluate its properties, and compare it with the other examined similarity measures. Based on this aim, two novel similarity measures, Variable Entropy and Variable Mutability are proposed; especially, the former one performs very well in datasets with a lower number of variables. The third aim of this thesis is to provide a convenient software implementation based on the examined similarity measures for nominal data, which covers the whole clustering process from a computation of a proximity matrix to evaluation of resulting clusters. This goal was also achieved by creating the nomclust package for the software R, which covers this issue, and which is freely available.
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Communications Intercultural Aspect in Working Environment of a chosen Firm
Jenšovský, Šimon ; Hiršová, Miloslava (advisor) ; Balgová, Dagmar (referee)
The thesis covers cultural differences among employees of a multi-national corporation in relation to communication and task execution. Thesis aims to construct a theoretical framework to map these cultural differences and apply gathered insights in practical research targeting the effect of cultural differences on communication and task execution. Research questionnaire replicates Hofstede's work and also builds on practical application of Hofstede's work by several authors. Research data were gathered via digital questionnaire. Data refinement and evaluation was conducted using frequency description and statistical methods of structure comparison. The thesis provides a set of practical recommendations as a result. These are aimed to help reduce or possibly eliminate negative effects of cultural differences in the workplace.
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Protection against DDoS attacks in the cloud computing
Vavroch, Zdeněk ; Karkošková, Soňa (advisor) ; Jelínek, Ivan (referee)
DDoS Attacks are nowadays huge threat on the internet. Many people and companies are dependent on accessibility of their data, services or applications. And that is what attackers try to abuse. In some cases, site or application that is not working, can make very bad name for the company in public. DDoS attacks are dangerous for people working at home, for corporate networks and mainly for huge clouds. Cloud are often targets of attacks because of how many people are affected by it. This thesis is focused on types of DDoS attacks we know and goal of the thesis is to find best defense solutions, mainly for defending the cloud computing. I will choose and describe the most common methods we know and use. In theoretical part I will describe what is cloud computing and DDoS attacks and what types of DDoS we know. In practical part I will describe the most common and efficient methods of defense.
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Building and use of smaller computer networks
Kyzivát, Marek ; Pinkas, Otakar (advisor) ; Šmejkal, Ivo (referee)
The thesis describes the initial state of the computer network Basic Schools and Kindergartens Ohradní (ZŠMŠ Ohradní) in Prague 4 and then its reconstruction, which I largely contributed. ZŠMŠ Ohradní consists of four pavilions and from one building on the other side of the street. The aim of this study is to assess the initial state of the network and point out the shortcomings that we discovered. We found deficiencies in the operation stress tests, measurements and data cabling overall analysis. Original networks connectivity was 100Mb/s. Together with a colleague, we are network administrators. Furthermore, I am going to introduce a new form of network, which has identified deficiencies improved, by using on newer technologies. I will describe its structure, address allocation, active and passive components, and operated services. New network is capable of 1Gb/s, and its spine is going to be 10Gb/s soon. Benefits of this reconstruction is faster, more stable and more modern network that will facilitate the work of employees of ZŠMŠ Ohradní. To these improvements, I have mainly contributed by measurements. I participated in the design and implementation of new form of data network. I collaborated with fellow Poc to the configuration of active elements and network services in reconstructed network.
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Design of marketing strategy in the company Imperium Finance
Petrovič, Marko ; Čermák, Radim (advisor) ; Sova, Martin (referee)
Internet marketing is currently one of the most important components of marketing. However, Internet marketing as a whole is much more important than mere webdesign, mere search engine optimization (SEO) or a simple PPC advertising. Most companies have recently made it throught with a website and that was all their presentation on the Internet. However, the internet is one of the fastest growing technology today and the number of its users is growing every year. Constantly there are new technologies that allow us to have a better user experience and also bring us new ways of presentation and promotion. Most of the companies make a mistake early on and underestimate the preparation, don't know their goals, customers or competitors. Internet marketing is the process and the contents of this process is the recognition, analysis, design, implementation, and ultimately verify that you achieve the goals of the organization. In the theoretical part it is defined internet marketing and its advantages over offline marketing. Briefly sum up the history and major milestones of Internet marketing that shaped its present form. Further, it's described current trends in Internet marketing and detail expands upon the selected Internet marketing tools and tools for evaluating the success of campaigns. The practical part deals with the proposal of marketing strategy in the company Imperium Finance. The main objective is to analyze the requirements of the company Imperium Finance, from analysis to draw specific conclusions and devise a marketing strategy that will support the vision and strategy of the company in the following period. All steps were carried out within the company Imperium Finance on real data from active clients and tested in action. The result is a proposal of a marketing strategy that will drive Imperium Finance, and a marketing plan for the company. The biggest benefit of this work is so real use theoretical knowledge in practice.
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The Centralisation of the Management of the Agriculture Commodities Transportation
Šťastná, Tereza ; Rathouský, Bedřich (advisor) ; Mervart, Michal (referee)
The main objective of my thesis is to evaluate a suitability of the project of the centralisation of management of agriculture commodities transportation in AGF Logistics. The evaluation is based on the analysis of operational and economic data. The results of the application of theoretical models confirmed my hypothesis that the project of a centralisation is a suitable solution for performance optimisation. It is possible to compare the actual state of the project with expected goals based on acquired data and find out the opportunities and risks connected with the project.
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Transformation of Network Data Reporting Process
Tolar, Tomáš ; Matuštík, Ondřej (advisor) ; Malinová, Ludmila (referee)
This thesis deals with transformation of network data reporting process in a Telecom company. The current process is MS Excel based and is inadequate and inefficient. The goal is to find the right tools and to implement them. The thesis is divided into three parts. First part is focused on theoretical background of reporting, i.e. Business Intelligence and other approaches. Second part explains general Network reporting principles and trends. In contrast with these theoretical recommendations, the actual level of the company's process is depicted. The last part of this thesis covers a practical implementation of selected applications. First, a choice is made within a variety of tools based on department's needs then the architecture is proposed and applications are implemented. The final part of the thesis provides an assessment of the benefits attained by this project.
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Analysing company's behaviour and communication on social networks
Němec, Milan ; Molnár, Zdeněk (advisor) ; Jelínek, Ivan (referee)
This thesis focuses on measuring company´s communication and behaviour on social networks. To capture the interaction between the company and its users the thesis uses web analytics tools. Therefore, the main objective of the thesis is analysis of these tools. To achieve this goal, the thesis characterizes social networks and their marketing opportunities for business promotion. Thanks to this, needs of using these tools is identified. The needs are: competitive analysis, optimizing communication, measuring achievement of objectives or detection competitive viral content. Research questions were determined and then analysis tools found answers to research questions. It was found that the tools provide various views of data and create a complete system for measuring and analysing behaviour and communication companies on social networks. The results were validated in a case study focused on the Facebook profile of the University of Economics in Prague. The study analysed the interaction profile of the school and its users and compared with others schools. In the results the analysis tools are validated and it is designed recommendation for improve engagement. This thesis revealed strengths and weaknesses of tools for measuring company´s communication and behaviour on social networks. It was found that these tools have wide range of use. They can be used for understanding the company's profile, its users, for purposes of competitive analysis, monitor corporate goals and optimize communications on social networks.
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Comparison of Investment Options of Eden Jinolice Resort
Adámek, Vojtěch ; Sieber, Patrik (advisor) ; Kuchár, Róbert (referee)
This thesis deals with the issue of investment decision. The goal of thesis is to evaluate for the company owners optimal investment variant of predetermined investment opportunities. Thesis is divided into theoretical-methodological part, which summarizes all the methods and procedures and practical part. The practical part consists mainly of net present value calculations, which chosen input data will be afterwards analyzed by sensitivity test. Application of these apparatuses will reveal the best investment opportunity, respectively their combination
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