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Design of CNC milling machine
Žák, Petr ; Pavlík, Jan (referee) ; Blecha, Petr (advisor)
The diploma thesis includes design of vertical CNC milling machine. It also includes research in the field of CNC milling machines on the world market, which is carried out to select the appropriate machine parameters and the structural configuration of the machine. Another part of the thesis deals with the selection of suitable components, design calculations, manufacturing drawings and the 3D model showing the final design solution of proposed machine.
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Differential tackle
Žák, Petr ; Kašpárek, Jaroslav (referee) ; Malášek, Jiří (advisor)
This bachelor´s thesis deals with the proposal and calculation of self-locking differential tackle with lifting capacity of 450kg 3.8m lift. It includes among others proposal of construction free and fixed pulley block, the choice of hand and hoist chain in common with calculation of sprockets to afore mentioned chains. It performs important strength calculations with assessment limits and self-locking safety taking into account the manual manipulation. There is a drawing documentation according to the topic of the bachelor´s thesis, attached to this document.
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The Impact of the Implementation of CRM on SMEs profitability and growth in the Czech Republic
Žák, Petr ; Procházka, Jan (advisor) ; Gapko, Petr (referee)
Rapid development of online applications supporting the corporate activities causes that the CRM software is being implemented more and more. Firms are looking for the ways how to stay competitive and retain their own customers. This thesis deals with the influence of CRM implementation on the profitability and growth of SMEs in the Czech Republic. For its purpose it uses economic data from MagnusWeb database and data collected through online questionnaire. In the first part it offers theoretical summary of the concept of CRM and CRM implementation, including the critical factors for CRM success. In the second part it comments from theory point of view surprising results of the econometric analysis and possible reasons leading to such results.
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Forecasting the Exchange Rate in the Czech Republic Using Non-linear Threshold Models
Žák, Petr ; Stráský, Josef (advisor) ; Kočenda, Evžen (referee)
The aim of this thesis is to analyze the performance of nonlinear threshold models in forecasting the exchange rate of Czech koruna against EUR. Data for this study were obtained from Statistical Data Warehouse of European Central Bank (ECB) website, from Czech National Bank (CNB) Board decisions minutes and from the press releases of Governing Council of ECB. The data set was split into two periods - from 1999 until November, 2013 when CNB started to use interventions and from November, 2013 until April, 2016. Models used in the thesis are Self-Exciting Threshold Auto Regressive (SETAR) models with one and two thresholds and two Threshold Auto Regres- sive (TAR) models with different threshold variables - meetings of CNB Board as dummy variable and average volatility over recent periods. The forecasting results indicate that SETAR models did not outperform Random Walk in any period. TAR models offered promising results in the period before interventions and surprisingly failed in the period during interventions. This study supports the general belief of exchange rates being difficult to forecast and that it holds in case of Czech koruna as well. JEL Classification F12, F21, F23 H25, H71, H87 Keywords forecasting, exchange rate, time series, nonlin- earity, SETAR, TAR Author's e-mail zaka.one@gmail.com...
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Komplexní řešení veřejného osvětlení
Žák, Petr ; Švecová, Simona
Public lighting as well as every technical infrastructure has got its own lifetime, so the periodic renovation is needed. Public lighting in the Czech Republic was built during the 70´s of the last century and regular renovations were done only in larger cities. In small cities and villages, the public lighting systems are almost at the end of their life time and it is necessary to make the overall reconstruction. For a long time, relatively a little attention was paid to public lighting. The situation was changed in the last few years, where thanks to the pressure to lower the energy consumption, the attention was focused also on the public lighting. Solutions of problems with energy efficiency are usually accompanied by financial instruments in the form of subsidies, grants etc. which support the change of technical equipment with low efficiency for technical equipment with high efficiency. However, in above mention steps the considerations of the overall reconstruction of public lighting is missing. With reference to situation in public lighting systems it would be appropriate to combine their energy performance solutions with overall reconstruction. Older lighting systems and unfortunately, also some new lighting systems, are not only energy inefficient but in many cases they also visually disturb public spaces by their location, design or proportions. In addition, they are the sources of obtrusive light too. Public spaces are important part of human settlements and the scale of life quality. The light is an instrument for creating environment with regards to many aspects (cultural, historical, functional, etc.) of urban areas. It is necessary to perceive public lighting comprehensively taking into account not only the traffic safety and energy consumption but also architectural-urban aspects and aspects connected with minimizing of obtrusive light.
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Všeobecný výpočet vnitřního osvětlení
Panská, Zuzana ; Žák, Petr ; Habel, Jiří
Paper deals with problematic of evaluation artificial and daylight as one medium. By this assumption we have to deal with the different evaluation of each lighting system. Whereas artificial light is evaluated by the measured or calculated value of illuminance stated in lux, daylight is evaluated by the value of daylight factor expressed in %. In paper is discussed the example of the possible lighting calculation by using the light vector to define illuminance in the field of rectangular light source such as window, problematic of various conditions of daylight and possible using of this method.
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Dodávka světla do budov
Žák, Petr ; Habel, Jiří ; Panská, Zuzana
Current method of design and evaluation of interior lighting in buildings is pulverized to the solution of individual spaces. Separately is evaluated energy consumption for lighting in the building. In this situation is very difficult to optimize the lighting systems. The relationship between the needs for lighting and overall energy consumption for lighting is not obvious. Clearer connection can be found in the simplified view of the whole issue. The required lighting levels and thus energy consumption in buildings are affected by three basic aspects. The first aspect is the usage of the building, i.e. what types of visual tasks in a building are exercised. The basic parameter for quantitative evaluation of visual requirements in today's practice is the illuminance E (Ix). The second aspect is the size of the building, thus the dimensions of spaces in which the visual tasks are performed. In this case the basic parameter is the illuminated area A (m2). The last aspect is the time during which the visual tasks are performed, expressed by operating time T (h). In this view the issue of the interior lighting in buildings can be converted to the delivery of luminous flux Φ (lm) or quantity of light QV (lm.h / year). Such expression is conceptually close to requirements for the supply of other media to the buildings, such as heat, air, water etc. The above considerations set the desired amount of luminous flux, respectively quantity of light. The next step is to set lighting quality parameters such as a minimum proportion of daylight, uniformity, limitation of the glare, the colour properties of light. In the last step, the optimal technical solution is found by selecting the type of lighting systems, light sources and luminaires, which meets both quantitative and qualitative requirements of lighting. Such approaches allow the creation of ideas about lighting needs in the initial stages of project and convert them to specific technical solutions.
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Design of CNC milling machine
Žák, Petr ; Pavlík, Jan (referee) ; Blecha, Petr (advisor)
The diploma thesis includes design of vertical CNC milling machine. It also includes research in the field of CNC milling machines on the world market, which is carried out to select the appropriate machine parameters and the structural configuration of the machine. Another part of the thesis deals with the selection of suitable components, design calculations, manufacturing drawings and the 3D model showing the final design solution of proposed machine.
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