@phdthesis{Garc{\´i}a Rodr{\´i}guez2023, type = {Master Thesis}, author = {Garc{\´i}a Rodr{\´i}guez, Saul}, title = {Design and FPGA implementation of a highly resource-efficient AES-256 encryption and decryption engine}, doi = {10.26205/opus-3747}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-37471}, pages = {263}, year = {2023}, abstract = {Growing demand for security in a wide range of fields gives raise to research for more efficient and modern methods. Additionally, the increase of systems that are deployed on hardware requires security to be embedded in small area to protect intellectual property, hardware, and integrity and confidentially of sensible data. Therefore, in this work a design and FPGA implementation of a highly resource-efficient AES-256 encryption and decryption engine is presented, as well as its comparison with state-of-the-art designs. The design shows a reduction in the resources used due to its architecture to reuse hardware throughout all the processing. The design is implemented on a Xilinx Artix-7 FPGA.}, language = {en} } @techreport{Vormann2023, type = {Working Paper}, author = {Vormann, Claus}, title = {Say what you pay? Pay Information Disclosure in German Job Postings}, doi = {10.26205/opus-3740}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-37407}, pages = {13}, year = {2023}, abstract = {Purpose - Pay transparency is a promising topic both for research and practice. In particular, the new European directive on compensation transparency will increase its importance. However, research is still relatively sparse compared to other areas of HRM. In particular, state-of-the-art and use of pay information disclosure in job postings is neglected. This paper aims to shed light on this HRM topic. Methodology - The paper summarizes the findings of a preliminary study conducted among German companies researching the proportion of firms offering compensation information in job postings and digging into the reasons behind it. Findings - Only 17 \% of the participating companies disclose meaningful information about compensation in their job postings. Doing so mainly depends on the company's attitude towards pay transparency. The age of the company has a minor negative influence, i.e.~older companies are less prone to disclose salary information. Industry, size, and existing overall pay transparency in the company do not determine if pay information is disclosed in job postings. Research limitations - The main limitation of this survey is its small size of 88 participants and the snowball sampling approach employed. This limits its representativeness and calls for follow-up studies involving more companies and a wider variation of positions included. Practical implications - While the EU directive will make it obligatory to communicate about pay before the first interview, some companies do it already. The study helps HR departments that think about changing their practice before it becomes compulsory to better judge the current standards.}, language = {en} } @phdthesis{Sarangi2023, type = {Master Thesis}, author = {Sarangi, Jitikantha}, title = {Digital Calibration, Closed Loop Regulation and Implementation of Digital Debugging Features for the Delay Asymmetry Compensation Logic of a 3D Polarization Camera Based on Time-of-Flight Principle}, publisher = {Fachhochschule Dortmund}, address = {Dortmund}, doi = {10.26205/opus-3732}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-37323}, pages = {107}, year = {2023}, abstract = {The work presented in this thesis deals with the distance measurement aspect of a 3D Polarization ToF camera for automotive applications that uses a Time-to-Digital Converter (TDC) to measure the time interval between the emission of light from a source and its reception. Based on the measurement of the time interval, distance can be calculated by applying the equation of motion. In application, achieving an exact distance measurement is quite strenuous because the operating conditions of the design are susceptible to change due to environmental factors. Therefore, to achieve accuracy in distance measurement, the time interval between the emission and reception of light must be measured precisely. For this purpose, a delay asymmetry compensation logic is developed. This thesis elaborates the addition of debugging features, redesign of some components, digital calibration approach and the entire testbench environment of the delay asymmetry compensation logic. It also sheds light on the implementation of the designed logic for its successful realisation in real hardware. Lastly, it concludes by narrating future prospects and further scopes of development.}, language = {en} } @phdthesis{Jung2023, type = {Master Thesis}, author = {Jung, Richard}, title = {Radiation Qualification of the Cologne Chip GateMate A1 FPGA}, doi = {10.26205/opus-3364}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33643}, pages = {118}, year = {2023}, abstract = {In this thesis, the radiation sensitivity of the novel Cologne Chip GateMate A1 field-programmable gate array (FPGA) is evaluated. An initial introduction of radiation mechanisms and their effects on electronics is given, followed by a brief overview of radiation test standards. The common elements present in FPGAs are discussed, which is followed by details of the GateMate FPGA device and a description of the software design flow. Afterwards, the development of a purpose-built printed circuit board (PCB) for radiation tests with the GateMate FPGA is detailed. Four components of the GateMate have been tested during three radiation campaigns, as well as a benchmark circuit to compare the radiation performance of the GateMate with other FPGAs tested at the European Organization for Nuclear Research (CERN). The test architecture consists of the device under test (DUT) FPGA and a TESTER FPGA whose task is to provide inputs to the DUT and record its response. The DUT and TESTER designs developed for all tests are discussed in detail. Finally, the results obtained during the irradiation campaigns are presented, showing that the GateMate FPGA performs similarly to other FPGAs using the same process technology. Only the benchmark test was not finalized, as implementation problems prevented its completion in the given time frame. The thesis concludes with a comprehensive summary and outlook.}, language = {en} } @unpublished{LattnerGellerKluck2023, author = {Lattner, Yannick and Geller, Marius and Kluck, Norbert}, title = {Efficiency Approximation of Centrifugal Compressors in the Cordier Diagram}, doi = {10.26205/opus-3366}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33661}, pages = {12}, year = {2023}, abstract = {We present a simulation data-based efficiency approximation for radial turbocompressors, which is implemented in the well-known Cordier diagram. A sophisticated CAE workflow is used to calculate the operational characteristics of 50 machine designs with 50 impeller geometry variations each. A Kriging-based surrogate model is trained to approximate the efficiency of any machine designs' best geometry design. The models are implemented into a machine design workflow. As a result, duty-specific Cordier lines are introduced. They are automatically generated for a set of machine design parameters. The efficiency of the designs along the duty-specific Cordier lines is approximated. Using optimization techniques, an optimal compressor design for the given duty on every specific Cordier line may be identified. This highly increases the amount of information available in the early design stages for radial turbocompressors.}, language = {en} } @article{LattnerGeller2023, author = {Lattner, Yannick and Geller, Marius}, title = {Radial Turbocompressor Chord Length Approximation for the Reynold's Number Calculation}, doi = {10.26205/opus-3335}, url = {https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33351}, year = {2023}, abstract = {We present an approximation model for the chord length of radial turbocompressors. The model enables the calculation of a compressor's chord Reynold's number during the machine design process. The chord Reynold's number is shown to be the most accurate representation of the fluid dynamic properties inside the radial turbocompressor's impeller. It — however — requires the computation of the chord length, which is only available after defining the final impeller geometry. The method presenting in this paper only employs the compressors principal dimensions to approximate the chord length. The chord is modelled using a B{\´e}zier spline and quarter ellipse. This enables the earlier use of the chord Reynold's number during the machine design process of radial turbocompressors.}, language = {en} }