@article{Herder2001, author = {Herder, Jens}, title = {Interactive Content Creation with Virtual Set Environments}, series = {Journal of the 3D-Forum Society}, volume = {15}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {53 -- 56}, year = {2001}, abstract = {Digital broadcasting enables interactive \sc tv studios with virtual set environments. This presentation reviews current technology and describes the requirements for such systems. Interoperability over the production, streaming, and viewer levels requires open interfaces. As the technology allow more interaction, it becomes inherent difficult to control the quality of the viewers experience.}, language = {en} } @article{GriesertWalczakHerder2003, author = {Griesert, Arnfried and Walczak, Oliver and Herder, Jens}, title = {Interactive Realtime Terrain Visualization for Virtual Set Applications}, series = {Journal of the 3D-Forum Society}, volume = {17}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {20 -- 26}, year = {2003}, abstract = {Virtual set environments for broadcasting become more sophisticated as well as the visual quality improves. Realtime interaction and production-specific visualization implemented through plugin mechanism enhance the existing systems like the virtual studio software 3DK. This work presents an algorithm which can dynamically manage textures of high resolution by prefetching them depending on their requirement in memory and map them on a procedural mesh in realtime. The main goal application of this work is the virtual representation of a flight over a landscape as part of weather reports in virtual studios and the interaction by the moderator.}, language = {en} } @inproceedings{HerderVonolfenGriesertetal.2004, author = {Herder, Jens and Vonolfen, Wolfgang and Griesert, Arnfried and Heuer, Stefan and Hoffmann, Ansgar and H{\"o}ppner, Bernd}, title = {Interactive Virtual Set Applications for Post Production}, series = {University of Aizu 2004 - Seventh International Conference on Human}, booktitle = {University of Aizu 2004 - Seventh International Conference on Human}, address = {Aizu-Wakamatsu}, year = {2004}, abstract = {Virtual set environments for broadcasting become more sophisticated as well as the visual quality improves. Realtime interaction and production-specific visualization implemented through plugin mechanism enhance the existing systems like the 3DK. This work presents the integration of the Intersense IS-900 SCT camera tracking and 3D interaction into the 3DK virtual studio environment. The main goal of this work is the design of a virtual studio environment for post productions, which includes video output as well as media streaming formats such as MPEG-4. The systems allows high quality offline rendering during post production and 3D interaction by the moderator during the recording.}, language = {en} } @techreport{Khabyuk2011, author = {Khabyuk, Olexiy}, title = {Introducing state-distant public broadcasting in Ukraine}, volume = {Arbeitspapiere des Instituts f{\"u}r Rundfunk{\"o}konomie an der Universit{\"a}t zu K{\"o}ln}, number = {286}, publisher = {Inst. f{\"u}r Rundfunk{\"o}konomie, Univ. K{\"o}ln}, address = {K{\"o}ln}, organization = {Inst. f{\"u}r Rundfunk{\"o}konomie, Univ. K{\"o}ln}, isbn = {978-3-938933-94-7}, year = {2011}, language = {en} } @article{Benim2022, author = {Benim, Ali Cemal}, title = {Introducing the "Mathematical Modelling and Numerical Simulation of Combustion and Fire" Section of the Journal Fire}, series = {fire}, volume = {5}, journal = {fire}, number = {6}, publisher = {MDPI}, issn = {2571-6255}, doi = {10.3390/fire5060178}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-40257}, year = {2022}, language = {en} } @article{TarlaoSteffensGuastavino2021, author = {Tarlao, Cynthia and Steffens, Jochen and Guastavino, Catherine}, title = {Investigating contextual influences on urban soundscape evaluations with structural equation modeling}, series = {Building and Environment}, volume = {188}, journal = {Building and Environment}, publisher = {Elsevier}, issn = {0360-1323}, doi = {10.1016/j.buildenv.2020.107490}, year = {2021}, language = {en} } @misc{Thielen2023, type = {Master Thesis}, author = {Thielen, Sven}, title = {Investigating JackTrip's Software Architecture: A Case Study On Prominent Reasons For Architectural Erosion In Open Source Software Originating From Academia}, publisher = {Hochschule D{\"u}sseldorf}, address = {D{\"u}sseldorf}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-44153}, school = {Hochschule D{\"u}sseldorf}, pages = {161}, year = {2023}, abstract = {Sustainable software architecture is crucial for the success of an evolving system that is affected by its context and environment. However, deviations between software design and implementation are often uncontrolled and induce architectural erosion. The literature describes several symptoms and observes this phenomenon in open source software. Prominent reasons for the occurrence of architectural erosion include a rushed evolution, recurring changes, a lack of developers' awareness, time pressures, and the accumulation of design decisions. Architectural erosion is also prevalent in academic projects, but it still needs to be researched in-depth in a real-life setting. In this work, a single case study investigates the symptoms and reasons for architectural erosion in open source software originating from academia by employing a mixed-methods approach. Architectural metrics from a static code analysis using ARCADE Core are contrasted with developers' perspectives sourced from semistructured interviews. The investigated project is JackTrip, a cross-platform application for realtime networked music performances and Internet reverberation research. The first research question aims at assessing the trend of structural symptoms for architectural erosion in JackTrip. The results show a significant increase in link overload smells in the course of the evolution, which reached 11 as of version 1.6.2. This supports the developers' perception of a rushed evolution corresponding to the second research question, which asks to what extent prominent causes for architectural erosion apply. Additionally, the interview data evince time constraints related to tight research funding and the commercialization of the project. Research question 3 investigates how the academic environment and the problem domain relate to the symptoms and reasons for architecture erosion. It has been found that these influences shape the development approach and impact contributor selection. In relation to a certain inexperience and lack of commitment of open source developers as a reason for architectural erosion, the results suggest further studies and opt for ending the discussion regarding skills. Currently, the role of an architect or dedicated architectural work does not seem to be present in the JackTrip project. However, structural issues described in this work should not be considered as categorical statements about its software architecture as they would need to be confirmed on a code level.}, language = {en} } @inproceedings{VersuemerSteffens2024, author = {Vers{\"u}mer, Siegbert and Steffens, Jochen}, title = {Investigating real indoor soundscapes and their predictability for known and unknown subjects [Vortrag]}, series = {Fortschritte der Akustik - DAGA 2024, 18. - 21. M{\"a}rz 2024, Hannover}, booktitle = {Fortschritte der Akustik - DAGA 2024, 18. - 21. M{\"a}rz 2024, Hannover}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, address = {Berlin}, year = {2024}, abstract = {Understanding people's perception of everyday sound involves a complex interplay of various acoustic and non-acoustic factors. Our objective is to uncover important predictors for predicting real indoor soundscapes. To this end, we re-analyzed soundscape data recorded and evaluated by individuals in their homes, aiming for the utmost ecological validity. Given the intricate nature of sound perception and potential non-linear effects of acoustic and psychoacoustic predictors, we utilized machine-learning methods combined with hierarchical linear modeling to analyze 6375 soundscapes from 96 participants including acoustical, psychoacoustical, as well as situational und person-related predictors. Based on this analysis, we measured both the variability within and between subjects and obtained model fits for the prediction of both soundscape pleasantness and eventfulness. In order to discuss cases where predictions for known individuals or places are of interest, we employed (nested) cross-validation using different data-splitting methods. By doing so, our study sheds light on the generalizability of empirical findings when predicting soundscape evaluations for unknown or known subjects and thus supports a deeper understanding of everyday sound perception.}, language = {en} } @article{EliassonWeberVogeletal.2016, author = {El{\´i}asson, Jonas and Weber, Konradin and Vogel, Andreas and P{\´a}lsson, Thorgeir and Yoshitani, Junichi and Miki, Daisuke}, title = {Investigation and Separation of Turbulent Fluctuations in Airborne Measurements of Volcanic Ash with Optical Particle Counters}, series = {Journal of Disaster Research}, volume = {11}, journal = {Journal of Disaster Research}, number = {1}, publisher = {Fuji Technology Press Ltd.}, issn = {1883-8030}, doi = {10.20965/jdr.2016.p0072}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-50023}, pages = {72 -- 84}, year = {2016}, abstract = {The science of measuring airborne volcanic ash concentrations supports research in such fields as atmospheric environmental science and the modeling of atmospheric pollution from volcanoes, and is thus very valuable to the aviation industry. These measurements show large scatter directly traceable to turbulent fluctuations responsible for diffusing volcanic dust. Before semistationary components in observations can be compared to each other or to simulation results, they must be separated from fluctuations. In the design of the separation process, however, neither seasonal or diurnal periodicity nor random disturbance with known properties exists to serve as a guideline. It has been suggested that fluctuations could be eliminated through repeated convolutions of a simple 3-point filter enough times. The number of convolutions is chosen from the change in the rate of increase of a special variability parameter. When semistationary concentrations are separated from fluctuations, their statistics are compared to turbulence parameters and the autocorrelation of the series. The method is demonstrated using three measurement series from Sakurajima, Japan measured in 2013. It is concluded that this new method is simple and trustworthy where knowledge and experience of the environmental parameters can be utilized to support the results. They indicate a variability of 40\% in the relative fluctuations of the PM10 and around 20\% of the PM2.5. The relative fluctuations may be considered completely random, but normally distributed rather than a white noise with an evenly distributed variance spectrum.}, language = {en} } @inproceedings{LauxGoebelNeefetal.2015, author = {Laux, Christoph and Goebel, Johannes and Neef, Matthias and Gotter, Andreas}, title = {Investigation in the Technical and Economic Feasibility of a Low-Pressure Steam Cycle for the Waste Heat Utilization of a Cogeneration Plant}, series = {Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2015 : presented at the ASME 2015 Turbo Expo: Turbine Technical Conference and Exposition, June 15 - 19, 2015, Montreal, Quebec, Canada / sponsored by the International Gas Turbine Institute}, volume = {3: Coal, biomass and alternative fuels - cycle innovations - electric power - industrial and cogeneration}, booktitle = {Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2015 : presented at the ASME 2015 Turbo Expo: Turbine Technical Conference and Exposition, June 15 - 19, 2015, Montreal, Quebec, Canada / sponsored by the International Gas Turbine Institute}, publisher = {International Gas Turbine Institute (ASME)}, address = {New York}, isbn = {978-0-7918-5667-3}, year = {2015}, abstract = {This paper deals with the investigation in the technical and economic feasibility of a low-pressure steam cycle for the waste heat utilization of a combined heat and power (CHP) plant. The proposed steam cycle uses a pressure level below atmospheric pressure which allows to use the heat from the motor's coolant for evaporation. The cycle is designed to increase the maximum electrical efficiency of a gas fired reciprocating engine and to increase operational flexibility for varying heat demand. Since organic Rankine cycle (ORC) plants are already being successfully used for waste heat recovery, advantages of the low-pressure steam Rankine cycle (SRC) over an ORC are highlighted. Many ORC fluids are toxic or flammable and thus have an increased risk potential compared to water. An additional advantage of water compared to ORC fluids is the possibility of superheating above 500 °C. The technical feasibility of the proposed cycle is studied by the detailed design of the individual system components such as turbine, heat exchangers and auxiliary parts. This includes the detailed thermodynamic design of the full cycle for the calculation of plant efficiencies. As a basis for future experimental investigations, a cogeneration plant with an electrical output of 50 kWel was selected as a heat source for the steam cycle. The design geometries of the turbine and the heat exchanger are presented along with efficiency and cost predictions. A subsonic radial turbine with a rotational speed of 155,000 rpm was selected. The maximum turbine output is about 7.5 kW. The use of a flash evaporator is investigated to reduce the size and the costs for the evaporator. The suggested steam cycle helps to increase the electrical efficiency of the CHP plant by 4.5\% points from an original 36.5\% to 41.0\%. The steam cycle itself has an electrical efficiency of approximately 9\%. Additionally, the condensation temperature in this steam cycle is high enough to be extracted as useful heat output to generate domestic water with a temperature of 50°C.}, language = {en} }