National Repository of Grey Literature
Not a member yet
574846 research outputs found
Sort by
The Geopolitics of the Outer Space: Dolman's astropolitik after 20 years
No full textAt the brink of the millennium, the book Astropolitik: Classical Geopolitics in the Space Age was published by the American author Everett C. Dolman. The book in question was subsequently considered as a ground-breaking work in strategic thinking about the outer space domain; however, the history of geopolitical thinking has a number of ambivalent experiences with such pioneering works. How Dolman's work has stood the test of time is the key question of this dissertation, which is examined through a comprehensive analysis of the book Astropolitik situated in the reality of contemporary space activities. Three core thematic segments are sequentially explored, starting with an analysis of Dolman's theoretical approach to geopolitical thinking about outer space through its fundamental principles, followed by a consideration of its correlation and influence in relation to contemporary geopolitical research. The second part focuses on Dolman's topographical projection of the outer space in relation to his geodeterministic ideas, which are then compared with the practices of space actors, thus providing answers about the relevance of this part of Astropolitik. Lastly, Astropolitik is analysed from the perspective of spacepower and its application in three identified domains, which include the civil,..
Traumatic event and the gloom of death from elite sport as a foundation for self-determination in the present
No full text“Fight Till Death” is a complex work of art that reflects the author's experiences from the past, when the acquired knowledge from the field of top sport is processed in an autobiographical way. The author uses his subcultural experiences that followed his end with whitewater rafting to form the subject matter, as indicated by the title of the work itself, motivated by a song by the American band Slayer. The title of the work is meant to stimulate the combativeness “beyond the grave” that is part of the motivation of acting in the field of elite sport, when the author, encouraged to dare to perform to the best of his ability, only came face to face with death. The work works primarily with the medium of video, in which ink drawing is also used, it is an exposition of different videos in the manner of a collage, with the music becoming an equal partner to the visual component. The aesthetics of drawings is in part noticeably stimulated by the work of Josef Váchal. The author presents a continuity with Váchal, namely with the illustrations from the book The Devil's Garden or the Natural History of Haunts, which he sees to some extent as a precursor of metal packaging “avant la lettre” before the emergence of metal itself. Furthermore, the author works with the depiction of an artificial face - a mask - in his drawings and in some of his videos, ergo drawing on Hans Belting's book Face and Mask: A Double History. The author's idea is to use the mask as a means to conceal qualities such as nihilism, chaos, death, loneliness, misanthropy, which are a consequence of the period of activities related to the top sport “Fight Till Death”. The result is an installation in the Káznice in Brno, the intention of which is to create the appearance of a metal club where a concert is currently taking place. The purpose is to create the impression in the recipient that he is present in the club at the concert, while the perception of metal music will stimulate him to be combative with the goal of victory
Impact of biodegradation of polyesters on selected ecosystems
No full textThe aim of this master’s thesis is to study the biodegradation of poly(3-hydroxybutyrate) (PHB) and polylactic acid (PLA) in the environment of selected sewage sludge and marine bacteria (WPN mixture) and to assess the influence of selected abiotic factors on this process. The initial experiment showed that the thermophilic sludge contained microorganisms capable of efficient PLA degradation, which was also supported by the elevated cultivation temperature. Based on these findings, abiotic tests were conducted to evaluate the effects of temperature, agitation, media components, and mechanical stress on the rate of polymer degradation. It was found that only the increased temperature had a significant effect, especially for amorphous PLA. In the experiments with mesophilic sludge and WPN mixture, biochemical oxygen demand (BOD) was continuously monitored using OxiTop systems and was found to be on average 20 % higher for the WPN mixture. However, higher mass losses were recorded for the mesophilic sludge, with a PHB loss of 3,52 %. Several other analyses were performed, including scanning electron microscopy (SEM), which revealed pores in the PHB caused by surface erosion, confirming the biodegradation potential of both the mesophilic sludge and WPN mixture. In contrast, no evidence of PLA biodegradation was found in these environments
Motion control of DeltaBot
No full textThe focus of the bachelor thesis is the control of the Deltabot robotic system using a PLC. The configuration of the individual software components, the creation of the HMI, and a simple motion program are described. Furthermore, the thesis describes the setup of a PI controller for the ACOPOS system that controls the servomotor. Finally, the possibility of controlling the torque of the servomotor is discussed
Creating a rolled fingerprint from multiple photos
No full textThis thesis presents an algorithm developed for processing finger images captured using a three-camera device utilizing appropriately selected wavelengths to obtain high-quality images. The algorithm aligns and merges individual images to extract a final 2D rolled fingerprint. To demonstrate its functionality, a web application was developed to visualize the image composition process and display the detected minutiae in the reconstructed rolled fingerprint. The quality of the results is evaluated by comparing them with reference fingerprints obtained from an optical tactile sensor. The thesis discusses the efficiency of the implemented solution and proposes potential extensions for practical deployment in biometric systems
Python library for parametrization of dysarthric voice
No full textThis thesis explores the application of modern speech signal processing methods for the diagnosis of hypokinetic dysarthria, a condition commonly associated with Parkinson’s disease. The theoretical part presents an overview of speech disorders linked to neurodegenerative diseases, as well as a comparison of conventional diagnostic approaches with algorithmic solutions based on speech analysis. In the practical part, a Python-based software library called VuVoPy was developed to extract selected speech parameters using algorithms such as SWIPE’ (for estimating the fundamental frequency F0), LevinsonDurbin recursion (for computing LPC coefficients and estimating formants F1 and F2), unvoiced/voiced detection via Gaussian Mixture Models, and harmonic-to-noise ratio (HNR) calculation through autocorrelation. The library is available as an open-source package on the PyPi platform and is supported by full documentation and unit tests. To validate the proposed solution, two stages of statistical analysis were performed. In the first phase, the performance of the core algorithms was compared to results obtained from the PRAAT software. In the second phase, the library was applied to a balanced subset of the PARCZ speech database, containing both healthy controls and Parkinson’s patients. The resulting correlation matrices and boxplots demonstrated the discriminative power of the extracted parameters across diagnostic and demographic groups. The findings confirm the potential of speech analysis as a valuable tool in the support of neurological disease diagnosis. VuVoPy represents a flexible framework, with future development focused on performance optimization and extended functionality
Benchmark for Edge AI applications in UWB IIoT
No full textThis master's thesis presents a comparative analysis of microcontrollers (MCUs) regarding their suitability for Edge AI applications in IIoT environments. The thesis defines a set of evaluation metrics and develops a comprehensive benchmark for testing the performance and efficiency of microcontrollers in processing artificial intelligence tasks. The research tested ten different microcontrollers on a total of 26 AI models. The testing primarily focused on models for person detection, keyword recognition, and noise reduction. MCU performance was evaluated in terms of inference speed, energy consumption, and memory requirements. The results show significant differences between platforms – while Teensy 4.0 excels in inference speed, STM32 L552ZE-Q offers the best energy efficiency. The thesis also identifies trade-offs between performance and energy consumption and provides recommendations for selecting suitable microcontrollers based on the specific requirements of particular Edge AI applications
Design of Electric Dump Truck
No full textThe construction sector is facing increasing demands to reduce emissions and increase operational efficiency, leading to a search for alternative solutions in the field of smaller construction equipment. This thesis focuses on the design of a compact electric powered dumper designed for rugged terrain and urban environments. The aim of the thesis is to present a complex design study of a machine that combines the functional, ergonomic and aesthetic requirements of contemporary construction. The design emphasises sustainability, simplicity of form and ease of maintenance. The cab and the overall design of the machine have been shaped to meet the needs of the operator and the modern requirements of safety and comfort. The resulting design offers not only emission-free operation, but also a refined aesthetic based on the principles of electromobility
Riding Hall
No full textThis bachelor thesis deals with the design and an assessment of a steel structure of a riding hall located in Rojetín. Floor plan dimensions are 25x50 m. Height of the structure at the very top is 8,3 m. The structure is made of 9 main frames where each consists of truss girders and column with the span of 25 m. Spacing of the main frames is 6,25 m each. Truss girders are stored on columns with joints. The spatial rigidity is in the transverse direction ensured by fixed columns and in the longitudinal directions i tis ensured by transverse and longitudinal bracing. Structural materiál is steel S235. Cladding cnsists of trapeze plates Precit Roof
A Research Study of Lattice Structures Applicable in Medicine
No full textThis bachelor’s thesis addresses the topic of lattice structures and their potential use in medicine, primarily for designing individualized implants. The aim of the thesis was to create an algorithm for generating geometric models of selected lattice structures, specifically triply periodic minimal surfaces (TPMS), and subsequently to perform deformation-stress analyses to evaluate their mechanical behavior. The theoretical part includes a literature review of the current state of knowledge in the field of lattice structures, commonly used materials, manufacturing technologies, and medical applications. The practical part focuses on the implementation of the algorithm in the MATLAB programming environment, which enables the generation of geometric models for various types of TPMS structures. Stress-strain analyses were performed on selected structures (Gyroid and Diamond), with their states determined using Finite Element Method (FEM) computational modeling in ANSYS software. Subsequently, their mechanical properties were investigated in relation to geometric parameters such as wall thickness and pore size. The results showed an approximated linear dependence of the apparent modulus of elasticity on wall thickness and a power-law dependence of the apparent modulus of elasticity on the pore size of the structure. To compare the computational models, an experimental compression test was performed on 3D-printed Gyroid samples, which showed agreement with the values determined by FEM. The conclusion summarizes the findings and proposes possibilities for further research, particularly in the area of gradient structures