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Detection of significant events in systems baased on phase OTDR
Makówka, David ; Petyovský, Petr (referee) ; Valach, Soběslav (advisor)
This diploma thesis concerns the design, implementation and testing of a system that classifies events captured using optic fiber along a perimeter of guarded objects. A theoretical part introduces physical principles, main structures of measuring systems, methods of measuring, data format, pre-processing options and classification using convolutional neural networks. A practical part describes implementation of a software for convolutional neural networks training and testing, process of samples extraction from measured data, its annotation and conversion to format required by neural networks. Results of measured data analysis and results of achieved classification accuracy using convolutional neural networks for both post processing of measured data and for deployment of neural network into real time processing system are presented.
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New organic semiconductors for bioelectronics
Malečková, Romana ; Salyk, Ota (referee) ; Vala, Martin (advisor)
This thesis focuses on the characterization of PEDOT:DBSA, a new semiconducting polymer for use in bioelectronic devices. It also deals with possibilities of surface treatment in order to enhance its biocompatibility and stability in aqueous environments. For this purpose, the organic polymer films were crosslinked with two crosslinking agents – GOPS and DVS. The ability of these agents to prevent leaching of some fractions of the polymer films in an aqueous environment and the ability to bind polymer molecules to each other as well as to the glass substrate was studied using the delamination test. Subsequently, the effects of these crosslinking agents on the film properties essential for the proper functions of bioelectronics made of these materials, was studied by contact angle measurements and four-point probes respectively. Moreover, several OECTs were prepared using original and crosslinked material as an active layer and were characterized by measuring transconductance and volumetric capacitance. PEDOT:DBSA has been shown to be a suitable material for use in bioelectronics, but its thin layers need to be stabilized in an aqueous environment. The agent DVS appears to be unsuitable for this purpose, mainly due to its insufficient film stabilization and its increased hydrophilicity of the film surface, thus increased tendency to interact with water, resulting in degradation of these thin layers. In contrast, GOPS, despite some reduction in film conductivity, has been able to stabilize the polymer layer over the long term, and thus appears to be a suitable way to stabilize PEDOT:DBSA.
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Detection of significant events in systems baased on phase OTDR
Makówka, David ; Petyovský, Petr (referee) ; Valach, Soběslav (advisor)
This diploma thesis concerns the design, implementation and testing of a system that classifies events captured using optic fiber along a perimeter of guarded objects. A theoretical part introduces physical principles, main structures of measuring systems, methods of measuring, data format, pre-processing options and classification using convolutional neural networks. A practical part describes implementation of a software for convolutional neural networks training and testing, process of samples extraction from measured data, its annotation and conversion to format required by neural networks. Results of measured data analysis and results of achieved classification accuracy using convolutional neural networks for both post processing of measured data and for deployment of neural network into real time processing system are presented.
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New organic semiconductors for bioelectronics
Malečková, Romana ; Salyk, Ota (referee) ; Vala, Martin (advisor)
This thesis focuses on the characterization of PEDOT:DBSA, a new semiconducting polymer for use in bioelectronic devices. It also deals with possibilities of surface treatment in order to enhance its biocompatibility and stability in aqueous environments. For this purpose, the organic polymer films were crosslinked with two crosslinking agents – GOPS and DVS. The ability of these agents to prevent leaching of some fractions of the polymer films in an aqueous environment and the ability to bind polymer molecules to each other as well as to the glass substrate was studied using the delamination test. Subsequently, the effects of these crosslinking agents on the film properties essential for the proper functions of bioelectronics made of these materials, was studied by contact angle measurements and four-point probes respectively. Moreover, several OECTs were prepared using original and crosslinked material as an active layer and were characterized by measuring transconductance and volumetric capacitance. PEDOT:DBSA has been shown to be a suitable material for use in bioelectronics, but its thin layers need to be stabilized in an aqueous environment. The agent DVS appears to be unsuitable for this purpose, mainly due to its insufficient film stabilization and its increased hydrophilicity of the film surface, thus increased tendency to interact with water, resulting in degradation of these thin layers. In contrast, GOPS, despite some reduction in film conductivity, has been able to stabilize the polymer layer over the long term, and thus appears to be a suitable way to stabilize PEDOT:DBSA.
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