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Title: Tools for NDL Elaboration Author: Bc. Elena Myazina Department: Department of Software Engineering Supervisor of the master thesis: doc. Ing. Karel Richta, CSc., Dept. of Software Engineering, Faculty of Mathematics and Physics, Charles University in Prague Abstract: Current state of research of networks enables end users to create custom connections (lightpaths) for a given application and optical private networks (OPNs). Such adjustments require clear communication between the requesting application and the desired network. Language NDL (Network Description Language) is used to describe such optical networks. NDL is based on the Resource Description Framework (RDF). This thesis analyzes the network description language NDL and its treatment. Current status of the network can be loaded in the form of the description in the NDL and displayed as the graphical representation. The representation enables to find out paths in the network, or edit the network. The result can then be transformed back into NDL format. Keywords: NDL, RDF, optical technology.

Title: Tools for NDL Elaboration Author: Bc. Elena Myazina Department: Department of Software Engineering Supervisor of the master thesis: doc. Ing. Karel Richta, CSc., Dept. of Software Engineering, Faculty of Mathematics and Physics, Charles University in Prague Abstract: Current state of research of networks enables end users to create custom connections (lightpaths) for a given application and optical private networks (OPNs). Such adjustments require clear communication between the requesting application and the desired network. Language NDL (Network Description Language) is used to describe such optical networks. NDL is based on the Resource Description Framework (RDF). This thesis analyzes the network description language NDL and its treatment. Current status of the network can be loaded in the form of the description in the NDL and displayed as the graphical representation. The representation enables to find out paths in the network, or edit the network. The result can then be transformed back into NDL format. Keywords: NDL, RDF, optical technology.

<p dir="ltr">We propose a hardware driven solution to high dynamic range (HDR) imaging in the form of a single metasurface lens. Our design consists of a metasurface capable of forming nine low dynamic range (LDR) sub-images of varying intensities scaling by a factor of 2 onto an imaging sensor. After synthetically verifying the functionality of our design, the metasurface is fabricated and a prototype system is constructed for real world experiments. Utilizing the experimental system, the compatibility of our extracted LDR sub- images with pre-existing exposure bracketing solutions for multi-image HDR fusion is demonstrated. The resulting HDR images are highly robust to scene motion due to the instantaneous capture of multi-exposure LDR sub-images allowing for HDR video capabilities.</p>

<p>A previously designed lens system is constructed and characterized for possible application to engine diagnostics and 3D reconstructions of combusting flows. Since optical engines cannot be operated at the same conditions as a production engine, optical access to a production engine, with minimum changes in the engine geometry is necessary for developing a better understanding of the in-cylinder processes. The application of a probe designed to fit in the pressure transducer port of a diesel engine was demonstrated in this work. Measurement of various optical parameters established the ability of the lens system to have a good resolution over the entire stroke length of the cylinder. The temperature analysis of the probe and lens system confirmed its ability to withstand the high-temperature conditions in the engine cylinder head. The lens system design was coupled with imaging fibers to transmit images from the image plane of the probe to a high-speed camera located at a safe distance from the combusting environment. Due to the robust design of the probe and its compatibility with an imaging fiber, the probe was identified to be a good alternative as an inexpensive lens system for tomography in challenging environments. To validate its use, 3D reconstruction of a sewing pin using a range of views was demonstrated. Parameters affecting the reconstructions were identified and optimized to obtain high-quality reconstructions. </p>

<p>Management of incoming solar radiation and use of the sky as an ultimate heat sink are technological imperatives as climate change shifts our reliance from fossil fuels to sustainable sources.  Selective solar absorbers are a possible route for solar harvesting as they collect the incoming radiation for process heat or space heating.  Here, improvement in the performance of selective solar absorbers via photon recycling is investigated using a stepped index rugate filter.  The final proposed filter when integrated with a high vacuum selective solar absorber could see an improvment in solar-thermal conversion efficiency from 13% to 30.6%. Then, a frequency selective optical filter is fabricated with uses including improvement of radiative coolers.  The measured optical characteristics are compared with simulation data and found to match well.</p> <p><br></p> <p>The shift to sustainable sources of electricity will require an expansion of the electrical grid.  The backbone of the grid for converting high voltage AC to DC, and vice versa, is power electronics.  The current state-of-the-art technology is GaN HEMTs, but GaN MISHEMTs are poised to replace them since MISHEMTs reduce the gate leakage current; a deficiency of the GaN HEMT architecture.  First, time dependent dielectric breakdown in GaN MISHEMTs is investigated using concurrent electrical and thermoreflectance methods.  A susceptibility in the MISHEMT architecture is found and possible solutions are proposed.  Then, liquid cooling of GaN HEMT PAs is explored by demonstrating integration of an X-band front end module, printed circuit board, and fluid manifold.  The integration shows great promise as two-phase cooling performance improved with increasing power dissipated, while single-phase cooling performance degraded.</p>

The thesis is focused on an analysis of mounting and cable laying fiber optic lines. The first chapter includes an analysis is made comparing parameters fiber and copper cabling, mainly in terms of access networks. This part specifies the various transmission media and access networks that are operated on them. Attention is focused on the transmission rate and its possible impact, provided the capacity and other important values. This section also demands site maintenance, service, or any failure on the routes of these networks. With this goal in the second chapter was created several designs networks that provide insight into possible solutions to the situation for emerging networks, and for upgrading existing networks, using both management and elements of optical and copper, or combinations thereof. Provide information from expert sources and verified directs the work of the future and to clarify further the eventual development of individual technologies. Most other space and offers the potential of optical technology, nature, and therefore the third chapter is fully devoted to only the transmission medium. At the beginning of this section is a theoretical analysis of possible ways of cable laying fiber optic cabling with a comparison of advantages and disadvantages. The most stable is an underground installation, which is costly in standard cases. As a result of these factors proved to be a possible solution using the underground installation of water pipeline shutdown. Therefore, the optical path designed, organized and implemented laying of fiber optic cable. By completing the inspection measurement and evaluation of the cost compared with other ways of installing fiber optic cable.