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Effect of acute sleep deprivation in different light conditions on the quality of recovery sleep
Zeithamlová, Barbora ; Kopřivová, Jana (advisor) ; Vlček, Kamil (referee)
Sleep is regulated by homeostatic and circadian processes. The circadian process is controlled by the internal biological clock, which is regularly synchronised with the external world by so-called zeitgebers. The most important zeitgeber for humans is light, therefore incorrect timing of light signals can lead to desynchronisation of the clock and sleep disruption; however, this depends on the intensity and spectral characteristics of the light. Dimmed red light is unlikely to significantly interfere with sleep regulation, but white light with a higher intensity could. White light is typically used when people stay awake during the night and experience acute total sleep deprivation. This could potentially interfere with the compensatory mechanisms occurring during subsequent recovery sleep. We therefore decided to test whether and how different lighting conditions during sleep deprivation can affect the structure of recovery sleep. We had 12 healthy uniform volunteers undergo two acute total sleep deprivations; one under normal white light, the other under dim red light. Using polysomnography, we measured the sleep parameters of both recovery sleeps and compared them. It turned out that sleep that occurred after the sleep deprivation in constant dim light conditions was less fragmented, had...
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The effect of environmental factors on mesenchymal stem cells
Hlávka, Jakub ; Krulová, Magdaléna (advisor) ; Vištejnová, Lucie (referee)
Mesenchymal stem cells (MSCs) have the potential to be a valuable therapeutic tool due to their capacity for differentiation and immunomodulation. However, in order to ensure their efficacy in clinical applications, it is necessary to gain a comprehensive understanding of the factors influecing their properties. This bachelor thesis investigates the influence of environmental factors, including physical activity, temperature and light exposure, on MSCs functionality. Additionally it desribes the underlying mechanisms involved in the action of these factors. Finally, it evaluates the theoretical implications of exploiting environmental cues to enhance MSCs properites. An understanding of how environmental conditions shape MSCs behavior is essential for optimising their therapeutic potential and advancing regenerative medicine strategies. Key words: mesenchymal stem cells, environmental factors, physical activity, temperature, light
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Palm liveness detection and identification
Kala, Adam ; Goldmann, Tomáš (referee) ; Sakin, Martin (advisor)
This bachelor's thesis is focused on the detection of liveness of the human hand and its identification from multispectral images. The main goal of the work is the recognition of a living hand and its forgeries based on the information we have obtained, the finding of minutiae for palm identification and their use. The work describes techniques for cropping the area of interest, extracting characteristic features from the palm, and subsequent detection of liveness and identification of the person. Liveness detection success reached over 90% and person identification with a False Acceptance Rate (FAR) of less than 2% for selected datasets.
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Sound of a low whisper
Krutsche, Karin ; Mladějovský, Josef (referee) ; Štindlová, Marie (advisor)
This bachelor's thesis examines the intersection of Christian themes with everyday life and draws inspiration directly from the Bible. The author focuses on her subjective interpretation of faith and reflects on the unexpected ways in which God's presence can manifest itself. Through her artwork, she visually depicts these themes, emphasizing the symbolism of light as a representation of God's transcendence.
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GLASS, LIGHT, OPTICS
Ilič, Andrej ; Fulínová, Katarína Kudějová - (referee) ; Tobola, Ondřej (advisor)
The bachelor thesis deals with the development of a glass pendant interior light. The author utilizes optical principles to achieve the desired lighting effect while contextualizing the piece within an interior space. The light design is conceived as a modular system, enabling the customer to assemble multiple units as a construction kit. The result of the thesis is a prototype ready for mass production.
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Usage of a luminance analyzer for analysis of natural light sources
Svoboda, Martin ; Baxant, Petr (referee) ; Novák, Filip (advisor)
This bachelor thesis is focused on the description of photometric quantities, presentation of methods of measuring illuminance and luminance, and explanation of the principle of devices used to measure these quantities. It also deals with the functions of the eye, its sensitivity, and changes in vision due to the alternation of day and night. The last chapter describes the origin of light in the natural sources of light, the Sun, the Moon, and fire, and then presents the measured values with their analysis.
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Gemini
Holcrová, Eliška ; Nový, Vítězslav (referee) ; Marek, Jiří (advisor)
The point of the proposal is to revitalize a high school for physically disadvantaged kids and the schools surroundings. The work includes a proposal for the revitalization of the school, the concept of a school garden, and a café with a community center. The result will be a suitable space for education, relaxation, and development, not only for the school students but also for the local residents.
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Measurement and creation of irradiance maps of irradiated surfaces
Šindelářová, Anna ; Jandová, Kristýna (referee) ; Křivík, Petr (advisor)
This diploma thesis deals with the measurement and creation of irradiance maps of irradiated surfaces. In the first part of the thesis, there are defined light and light radiation and its types and there are explained the basic concepts closely related to light radiation. Furthermore, this thesis also describes different types of radiation sources and their effect on irradiated surfaces. The theoretical part concludes with a chapter on radiation sensors, specifically pyranometers. In the second part of the thesis, the intensity of the radiation incident on the selected surface was measured by the selected radiation source, and then the radiation distribution was simulated using the Agilent VEE Pro 9.2 software environment. Subsequently, the measurement and its simulation were processed and evaluated.
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Zlín FCK Technology
Morávek, Jakub ; Kudla, David (referee) ; Štěpán, Marek (advisor)
The diploma thesis deals with the design of a residential building in the area of Malenovice near Zlín, where a new residential complex is to be built on the land of the current Malenovice sawmill, situated in close proximity to a four-lane road. The concept of this proposal is based on a detailed examination of human cycles and their impact on people in everyday life in relation to architecture. From the life cycle through the annual cycle and especially the daily cycle, professionally referred to as the circadian rhythm. The building, with its idea concept, orientation to the cardinal points, zoning of the apartment and also the shape solution, responds to the needs of man in terms of light comfort and at the same time addresses the greatest efficiency of the technologies used precisely in relation to light comfort, the form solution also creates conditions at the terrace level for the meeting of a wide range of inhabitants of the house - creating diversity. It reduces the need to illuminate the space during the day with artificial lighting, and after dark it addresses artificial lighting with respect to human health, thus also reducing energy consumption.
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Fragile Future
Jedličková, Eliška ; Sobotka, Jiří (referee) ; Gabriel, Michal (advisor)
Fragility, variability, immateriality... In my final master's thesis, I focused on the theme of fragility and shadow in visual art. I directed my initial idea towards the motif of fragility and transience. It's a topic that has interested me for quite some time. Where are the boundaries of fragility? How can the perception of this concept differ for each of us? Fragility can be understood as a certain material property, but also as an internal matter. In connection with this theme, I decided to work with shadow, which, for me, is in many ways fragile, elusive, variable, and has no material essence, real nature, or form. I thus chose to work with aesthetic and spiritual phenomena.
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