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    DigitalF: Maschinenbau und MechatronikI: Fraunhofer AWZ CTMT

    Zeitschriftenartikel

    F. Heilmeier, R. Koos, M. Singer, C. Bauer, Peter Hornberger, Jochen Hiller, W. Volk

    Evaluation of Strain Transition Properties between Cast-In Fibre Bragg Gratings and Cast Aluminium during Uniaxial Straining

    Sensors, vol. 20, no. 21

    2020

    DOI: 10.3390/s20216276

    Abstract anzeigen

    Current testing methods are capable of measuring strain near the surface on structural parts, for example by using strain gauges. However, stress peaks often occur within the material and can only be approximated. An alternative strain measurement incorporates fibre-optical strain sensors (Fiber Bragg Gratings, FBG) which are able to determine strains within the material. The principle has already been verified by using embedded FBGs in tensile specimens. The transition area between fibre and aluminium, however, is not yet properly investigated. Therefore, strains in tensile specimens containing FBGs were measured by neutron diffraction in gauge volumes of two different sizes around the Bragg grating. As a result, it is possible to identify and decouple elastic and plastic strains affecting the FBGs and to transfer the findings into a fully descriptive FE-model of the strain transition area.We thus accomplished closing the gap between the external load and internal straining obtained from cast-in FBG and generating valuable information about the mechanisms within the strain transition area.It was found that the porosity within the casting has a significant impact on the stiffness of the tensile specimen, the generation of excess microscopic tensions and thus the formation of permanent plastic strains, which are well recognized by the FBG. The knowledge that FBG as internal strain sensors function just as well as common external strain sensors will now allow for the application of FBG in actual structural parts and measurements under real load conditions. In the future, applications for long-term monitoring of cast parts will also be enabled and are currently under development.

    DigitalF: Maschinenbau und MechatronikI: Fraunhofer AWZ CTMT

    Zeitschriftenartikel

    Jochen Hiller, Peter Landstorfer, Philipp Marx, Matthias Herbst

    Evaluation of the impact of faulty scanning trajectories in robot-based x-ray computed tomography

    Measurement Science and Technology, vol. 32, no. 1

    2020

    DOI: 10.1088/1361-6501/abaf2a

    Abstract anzeigen

    X-ray computed tomography (CT) imaging for industrial applications is limited to certain physical conditions to be fulfilled. The size of the measuring object and the accumulated wall thickness are two fundamental conditions. An omission of these conditions by not capturing object attenuation information by the x-ray detector leads to missing data in the 3D reconstruction process and results as a consequence in image degradation and artifacts. Conventional industrial x-ray CT is based on cone-beam projections and circular or helical scanning trajectories using linear axis and a rotary (lift) table. For many inspection tasks on big-sized or unusually shaped objects the physical limits for obtaining a sufficient high image quality are reached very quickly when using conventional CT systems. Industrial six-axis robots offer much more flexibility with respect to the conditions mentioned earlier and can overcome the limitations of conventional scanners. In the present work we characterized an industrial six-axis robot in its working space following ISO 9283 in terms of pose accuracy and pose repeatability. These results are then used to simulate faulty scanning trajectories in terms of pose deviations where a single robot is used as an object manipulator to rotate virtual specimens on a circular trajectory resulting in different (faulty) reconstruction datasets. These datasets are evaluated visually and by using performance parameters and geometrical features in order to determine the reproduction fidelity (performance) of a one arm robot-based CT system depending on different pose errors. With the results obtained it was shown that a robot-based CT system of type B (in our classification scheme) using one robot as object manipulator should be able to reach a spatial resolution power in the range of the voxel size (in our case 200 µm) and smaller (neglecting effects from focal spot size, detector unsharpness from x-ray to light conversation and scatter radiation) if systematic pose errors are compensated using appropriate calibration methods.

    DigitalF: Maschinenbau und MechatronikI: Fraunhofer AWZ CTMT

    Zeitschriftenartikel

    S. Zabler, M. Maisl, Peter Hornberger, Jochen Hiller, C. Fella, R. Hanke

    X-ray imaging and computed tomography for engineering applications

    tm - Technisches Messen, vol. 87, no. Online veröffentlicht: 08.04.2020

    2020

    DOI: 10.1515/teme-2019-0151

    Abstract anzeigen

    After an incremental development which took place over four decades, X-ray imaging has become an important tool for non-destructive testing and evaluation. Computed Tomography (CT) in particular beholds the power of determining the location of flaws and inclusions (e. g. in castings and composites) in three-dimensional object coordinates. Therefore, and thanks to a speed-up of the measurement, CT is now routinely considered for in-line inspection of electronics, castings and composites. When precision and not speed is important, Micro-CT (μCT) can be employed for Dimensional Measurements (DM, e. g. quality assurance and shape verification), as well as for in situ testing, and for characterizing micro-structures in metals and composites. Using appropriate image processing and analysis μCT can determine the local fibre orientation in composites, the granular morphology of battery cathodes or the inter-connectivity of certain phases in casting alloys. Today, the large variety of X-ray instruments and methods poses an application problem which requires experience and a lot of knowledge for deciding which technique applies best to the task at hand. Application-specific guidelines exist for X-ray radiography testing (RT) only, whereas standardization has been applied to CT, unfortunately leaving out high resolution subμ CT, and nano-CT. For the latter exist an equally high number of NDT applications, however these instruments still necessitate a profound expertise. The task is to identify key industrial applications and push CT from system standardization to application specific automation.

    DigitalS: TC Grafenau

    Zeitschriftenartikel

    Ali Fallah-Tehrani

    The Choquet Kernel on the use of Regression Problem

    Information Sciences, no. 08 December 2020

    2020

    DOI: 10.1016/j.ins.2020.11.051

    Abstract anzeigen

    Recently, we have presented a new family of kernels on the basis of the discrete Choquet integral. While a naïve computation of this kernel has an exponential complexity in the number of features, we have proposed an efficient approach with computational complexity of 1. This kernel family is able to recognize dependencies between features and moreover it can be regularized through a proper selection of q-additivity. In fact, to reduce the effect of over-fitting there is an opportunity to restrict the flexibility of kernel to a lower degree. A key feature of the Choquet integral in a data-driven way is its monotonicity, however, this representation does not consider any monotonicity constraint; hence it is versatile for other applications, too. This issue is highlighted in the experimental study. In this regard, we apply the Choquet kernel for regression task and compare the performance of the proposed kernel versus state-of-the-art support kernel-based regression methods as well as random forest.

    DigitalMobilS: TC Freyung

    Beitrag (Sammelband oder Tagungsband)

    M. Novàk, J. Geyer, M. Prokýšek, M. Hais, S. Gril, M. Davidková, P. Doležal, Peter Hofmann, Rajan Paudyal

    Construction of a Multisensor UAV System for Early Detection of Forest Pests

    Advances in Intelligent Systems and Computing V, Cham, Switzerland, vol. 1293

    2020

    ISBN: 978-3-030-63270-0

    DigitalNachhaltigF: Europan Campus Rottal-Inn

    Zeitschriftenartikel

    Kueppers. M., C. Perau, M. Franken, H. Heger, Matthias Huber, M. Metzger, S. Niessen

    Data-Driven Regionalization of Decarbonized Energy Systems for Reflecting Their Changing Topologies in Planning and Optimization

    Energies, vol. 13, no. 16

    2020

    DOI: 10.3390/en13164076

    Abstract anzeigen

    The decarbonization of energy systems has led to a fundamental change in their topology since generation is shifted to locations with favorable renewable conditions. In planning, this change is reflected by applying optimization models to regions within a country to optimize the distribution of generation units and to evaluate the resulting impact on the grid topology. This paper proposes a globally applicable framework to find a suitable regionalization for energy system models with a data-driven approach. Based on a global, spatially resolved database of demand, generation, and renewable profiles, hierarchical clustering with fine-tuning is performed. This regionalization approach is applied by modeling the resulting regions in an optimization model including a synthesized grid. In an exemplary case study, South Africa’s energy system is examined. The results show that the data-driven regionalization is beneficial compared to the common approach of using political regions. Furthermore, the results of a modeled 80% decarbonization until 2045 demonstrate that the integration of renewable energy sources fundamentally changes the role of regions within South Africa’s energy system. Thereby, the electricity exchange between regions is also impacted, leading to a different grid topology. Using clustered regions improves the understanding and analysis of regional transformations in the decarbonization process.

    DigitalS: TC Freyung

    Beitrag (Sammelband oder Tagungsband)

    M. K. Vichrová, P. Hájek, M. Kepka, Laura Fiegler, Mariann Juha, Wolfgang Dorner, R. Fiala

    Current Digital Travel Guide of Peregrinus Silva Bohemica Project

    Proceedings of the 2020 10th International Conference on Advanced Computer Information Technologies (ACIT) [September 6-8, 2020; Deggendorf]

    2020

    DOI: 10.1109/ACIT49673.2020.9208922

    Abstract anzeigen

    Delivering a piece of proper and interesting information to tourists is always a challenge to deal with. It can be provided by many possible ways using traditional analogue materials (flyers, information table or paper maps) or using modern technologies such as web pages, mobile applications or an online multimedia tourist guide. One of online tourist guides is a travel guide created in Peregrinus Silva Bohemica project. This paper provides information about the final stage of such a guide from content and a technical point of view, to point out the complexity and usefulness of such a tool for tourists.

    DigitalS: TC Freyung

    Beitrag (Sammelband oder Tagungsband)

    M. Novàk, M. Prokýšek, P. Doležal, M. Hais, S. Gril, M. Davídková, J. Geyer, Peter Hofmann, Rajan Paudyal

    Multisensor UAV System for the Forest Monitoring

    Proceedings of the 2020 10th International Conference on Advanced Computer Information Technologies (ACIT) [September 6-8, 2020; Deggendorf]

    2020

    DOI: 10.1109/ACIT49673.2020.9208993

    Abstract anzeigen

    In recent years, unmanned aerial vehicles (UAV) of various shapes, sizes and functions have been increasingly used for civilian applications in a wide range of fields. UAVs are flexible, inexpensive, with the ability to carry high resolution sensing systems. UAVs fill the gap between manned aircraft and satellite remote sensing systems. When searching for new methodologies, especially in forestry research, UAVs are a unique platform. Remote forest sensing, forest mapping, forest precise measurement, forest fire monitoring and support for intensive forest management are areas in which remote sensing is fully utilized. The advantages of remote sensing are mainly low material and operating costs, flexible space and time deployment, and high intensity data collection. In order to move remote sensing applications from the experimental phase into real deployment, it is necessary to come up with new methodologies that can be determined using UAVs.

    DigitalGesundF: Angewandte GesundheitswissenschaftenS: TC Freyung

    Beitrag (Sammelband oder Tagungsband)

    Ludwig Schiller, Manuela Wühr, Rainer Pöschl, Wolfgang Dorner

    Concept for the Large Scale Deployment of Ambient Assisted Living Systems

    Proceedings of the 2020 10th International Conference on Advanced Computer Information Technologies (ACIT) [September 6-8, 2020; Deggendorf]

    2020

    DOI: 10.1109/ACIT49673.2020.9208911

    Abstract anzeigen

    This paper deals with the problem of equipping 100 households in Lower Bavarian with sensors using different interfaces and protocols. This sensor set in the households is used in the context of the research project DeinHaus 4.0 of Deggendorf Institute of Technology. This project focuses on supporting technologies to enable elderly people to live as long as possible in their own house or apartment. Therefore, a set of sensors and Ambient Assisted Living (AAL) technologies are used to build a supporting system. Furthermore, the system collects, anonymizes and stores the sensor data for further technical and social analysis.

    DigitalF: Angewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    Heribert Popp, Monica I. Ciolacu, Leon Binder

    Education 4.0: IoT- und CoP-unterstützte Smarte E-Learning Prozesse

    Tagungsband zum 19. E-Learning-Tag der FH JOANNEUM: Innovation & Reflexion – Henne oder Ei? , vol. 130

    2020

    Abstract anzeigen

    Studierende erleben im Lernmanagementsystem (LMS) „Moodle“ smarte E-Learning Prozesse in Mathematik- und Wissensmanagement-Kursen. „Smartes E-Learning“ besteht in Anlehnung an „smarte Produkte“ aus einer physischen, einer intelligenten und einer Vernetzungs-Komponente. Vernetzt sind die StudentInnen mit dem LMS einerseits in „Communities of Practice“ (CoP) zur Reflexion und andererseits über die Sensoren ihrer Smartphones oder Smartwatches (physische Komponente). Damit lässt sich dieses Lernumfeld der Kategorie “Internet of Things” (IoT) zuordnen. Im Lernprozess können die eingebetteten Sensoren mit den Biosignalen „Puls“ (HR) und „Herzfrequenzvariabilität“ (HRV) zur Selbstreflexion der Lernenden, zur Steuerung des Lernsystems und zur Personalisierung des Nutzungserlebnisses dienen. Erste Tests fanden u.a. Korrelationen zwischen erreichten Punkten in den Kontrollfragen und den Werten der Biosignale. Als intelligente Komponenten sind BenutzerInnenmodellierung, Chatbot, maschinelles Lernen usw. bei „Education 4.0“ im Einsatz.

    DigitalF: Angewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    Monica I. Ciolacu, Ali Fallah-Tehrani, P. M. Svasta, I. Tache, D. Stoichescu

    Education 4.0: An Adaptive Framework with Artificial Intelligence, Raspberry Pi and Wearables- Innovation for Creating Value

    Proceedings of the 2020 IEEE 26th International Symposium for Design and Technology in Electronic Packaging (SIITME)

    2020

    DOI: 10.1109/SIITME50350.2020.9292148

    Abstract anzeigen

    The Education 4.0 process can be used to foster students' performance, to motivate them by means of adaptive and personalized learning, to automate answering routine questions and to improve the quality of online examinations. It releases teachers from routine tasks, and it enables them to be more involved in the individualization of the educational process and in innovation. We apply artificial intelligence methodology to motivate students to improve their performance, and to identify early in course which students are at-risk of dropping out. In the adaptive Education 4.0 loT framework, the environmental and embedded sensors from wearables examine biosignals with biofeedback, such as pulse (HR) and heart rate variability (HRV), thereby increasing students' self-reflection, and allowing for a more personalized learning experience. The first experiments corroborate meaningful correlations between the data-points reached in the self-assessments, and values of the biosignals.

    DigitalF: Angewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    Monica I. Ciolacu, P. M. Svasta, D. Hartl, S. Görzen

    Education 4.0: Smart Blended Learning assisted by Artificial Intelligence, Biofeedback and Sensors

    Proceedings of the 2020 IEEE 14th International Symposium on Electronics and Telecommunications (ISETC2020)

    2020

    DOI: 10.1109/ISETC50328.2020.9301034

    Abstract anzeigen

    The paper presents smart blended learning for fostering students’ performance. It uses models of student activity and detects causes of a possible drop out, using learning analytics and real-time data. Taking advantage of embedded sensors (non-invasive, low-cost, flexible and distraction free) built into wearable devices real-time data can be used to support students’ success, well-being and health. In our contribution to the research topic we evaluate the students' experience with smart blended learning using biofeedback methods, sensor data extracted from wearables for five specific lectures, during study periods and in examinations. The preliminary results indicate a correlation between the physiological signals and the grades in examination.

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Buch (Monographie)

    Franz Xaver Röhrl

    Ein flexibles Leiterplatten-Technologiekonzept für Anwendungen im Millimeterwellenbereich

    Dissertationsschrift

    Elektrotechnik, München

    2020

    ISBN: 978-3-8439-4537-0

    Abstract anzeigen

    Die vorliegende Arbeit beschreibt ein Konzept zum Betrieb von millimeterwellentauglichen Schaltungen auf konventionellen Leiterplatten. Dazu werden neben den technologischen Grundlagen und neuen Leiterplattentechnologien auch konkrete Realisierungen von Schaltungen vorgestellt. Der Fokus liegt dabei auf einer toleranzarmen, fertigungstechnisch prozesssicheren Umsetzung. Die entwickelten Fertigungsverfahren und Optimierungen erlauben die Herstellung von bisher nicht realisierbaren Feinstleiter-Strukturen auf Außenlagen und ermöglichen dadurch auch eine breitbandige dämpfungsarme Signalführung. Ein großer Vorteil der hier vorgestellten Umsetzung ist, dass die Verfahren zum Großteil mit konventionellen Leiterplattenprozessen umgesetzt werden können und auch eine beliebige Kombination mit bestehenden Leiterplattenprozessen zulässig ist. Es wird versucht möglichst viele Funktionen und Herausforderungen direkt auf der kostengünstigen Leiterplatte zu lösen. Das Konzept beinhaltet zudem eine breite Auswahl an Möglichkeiten zur reflexionsarmen Kontaktierung der Leiterplatte von Signalen im Millimeterwellenbereich. Außerdem wird die Anbindung von aktiven Bausteinen und anderen Schaltungsträgern detailliert behandelt. Die Ergebnisse werden sowohl mit dem aktuellen Stand der Leiterplattentechnologie als auch mit alternativen Fertigungstechnologien verglichen und bewertet.

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Zeitschriftenartikel

    Felix Sepaintner, Andreas Scharl, Franz Xaver Röhrl, Werner Bogner, Stefan Zorn

    Characterization and Production of PCB Structures With Increased Ratio of Electromagnetic Field in Air

    IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 6, pp. 2134-2143

    2020

    DOI: 10.1109/TMTT.2020.2983934

    Abstract anzeigen

    Producing passive printed circuit board (PCB) structures in the millimeter-wave range includes some fundamental challenges, such as low manufacturing costs and high fabrication accuracy. These aspects, in general, have to be combined with low signal attenuation, precise simulation models, and a reliable producibility. This article shows a new method to manufacture different kinds of passive RF waveguides with reduced attenuation and decreased electrical length on low-cost PCB substrates. First, the complex material parameters of the used substrate and the used copper foil are extracted from 10 to 100 GHz to have accurate simulation models in CST Microwave Studio. This is necessary because the parameters provided by the manufacturer are often no longer generally valid in this frequency range. In addition, PCB materials have a significantly higher surface roughness compared with conventional materials for millimeter-wave applications. Therefore, the correct determination and the correct modeling of surface roughness is particularly important. Next, laminate is removed partially on the outer layer of the PCB to increase the electromagnetic field ratio in air. The undesired substrate is removed by a CO2 laser drilling machine by setting narrow drills sequentially. The RF performance of these waveguides is compared with those manufactured in conventional PCB technology according to attenuation and producibility.

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Zeitschriftenartikel

    E. Hassan, B. Scheiner, F. Michler, M. Berggren, E. Wadbro, Franz Xaver Röhrl, Stefan Zorn, R. Weigel, F. Lurz

    Multi-Layer Topology Optimization of Wideband SIW-to-Waveguide Transitions

    IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 4, pp. 1326-1339

    2020

    DOI: 10.1109/TMTT.2019.2959759

    Abstract anzeigen

    This article utilizes a topology optimization approach to design planar multilayer transitions between substrate integrated waveguides (SIWs) and rectangular waveguides (RWGs). The optimization problem is formulated based on the modal field analyses and Maxwell's equations in the time domain solved by the finite-difference time-domain (FDTD) method. We present a time-domain boundary condition based on the Klein-Gordon equation to split traveling waves at homogeneous waveguide ports. We employ the boundary condition to compute portal quantities and to devise an adjoint-field system that enabled an efficient computation of the objective function gradient. We solve design problems that include more than 105 000 design variables by using less than 400 solutions of Maxwell's equations. Moreover, a new formulation that effectively combats the development of in-band resonances in the design is presented. The transition configuration allows the direct mount of conventional RWG sections on the circuit board and aims to cover the entire K-band. The guiding structure of the optimized transition requires blind vias, which is realized by a simple and cost-efficient technique. In addition, the transition is optimized for three different setups that can be used to provide different field polarizations. The proposed transitions show less than 1-dB insertion loss and around 15-dB return loss over the frequency interval 18-28 GHz. Several prototypes are fabricated with an excellent match between the simulation and measurement results.

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Beitrag (Sammelband oder Tagungsband)

    Felix Sepaintner, Andreas Scharl, Florian Keck, Kevin Kunze, Franz Xaver Röhrl, Werner Bogner, Stefan Zorn

    Cost-Effective Implementation of Air-Filled Waveguides on Printed Circuit Boards

    [Invited Talk]

    Proceedings of the IEEE Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS)

    2020

    DOI: 10.1109/EPEPS48591.2020.9231382

    Abstract anzeigen

    This paper presents a new cost-effective method to produce air-filled waveguides out of a printed circuit board (PCB) with a milling machine and how to implement them with standard PCB technology. For this purpose, low cost substrates like FR-4 are used. For the baseboard to waveguide transition in the E-Band (60-90GHz) a WR12 waveguide connector [1] was used. The WR12 waveguide was manufactured and analyzed on mechanical deviations. The RF performance in the E-Band was measured and compared to common PCB waveguides like microstrip lines (MS) and grounded coplanar waveguides (GCPW).

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Beitrag (Sammelband oder Tagungsband)

    Felix Sepaintner, Andreas Scharl, Franz Xaver Röhrl, Werner Bogner, Stefan Zorn

    Extracting Complex PCB Substrate Permittivity from a Transmission Line using the Finite Difference Integral Method from 10 GHz - 100 GHz

    [Invited Talk]

    Proceedings of the 2020 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

    2020

    DOI: 10.1109/IMWS-AMP49156.2020.9199738

    Abstract anzeigen

    This paper presents a new numerical method to deduce the complex permittivity εr of PCB (printed circuit board) substrates. First, the attenuation and phase of an on board transmission line are measured with a vector network analyzer (VNA). The transmission line is then simulated with the finite difference integral method (FDI) with the substrate substituted by air. The measured and simulated phases are used, to calculate the effective permittivity and the real part of the complex permittivity εr ' . With known εr ' , the electromagnetic field distribution can be calculated, which is necessary to deduce the imaginary part of the permittivity. The shown algorithms can be used for frequencies up to 100 GHz and without any iterative processes.

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Beitrag (Sammelband oder Tagungsband)

    Andreas Scharl, Felix Sepaintner, Franz Xaver Röhrl, Werner Bogner, Stefan Zorn

    Design and Comparison of Filter Structures in the Millimetre Wave Frequency Range on Outer- and Inner-Layers of Organic Circuits Boards

    [Invited Talk]

    Proceedings of the 2020 European Microwave Conference (EuMC)

    2020

    DigitalF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: IPH Teisnach

    Beitrag (Sammelband oder Tagungsband)

    Andreas Scharl, Felix Sepaintner, Franz Xaver Röhrl, Werner Bogner, Stefan Zorn

    Simulation and Measurement of PCB Crossover Structures from DC up to 70 GHz

    [Invited Talk]

    Proceedings of the 2020 German Microwave Conference (GeMiC)

    2020

    Abstract anzeigen

    In this paper, 4 different crossover structures in a 6-layered printed circuit board (PCB) for high operation frequencies are presented. The design for all structures is based on grounded coplanar waveguide (GCPW). Two fully planar structures, a quasi-coaxial transition and coaxial transition are realized and have a measured bandwidth from DC to 50 GHz and DC to 60 GHz, respectively. Moreover, two structures are designed in submount technology. Especially the connection between baseboard and package (solder junction) plays an important role to guarantee best signal integrity. Therefore, the quality of the solder junction is analysed in detail with TDR (time domain reflectometry) measurement as well as with X-ray images. The submount transitions show good radio frequency (RF) characteristics from DC to 70 GHz.

    DigitalI: Zentrum für Akademische WeiterbildungP: DEG-DLM2

    Buch (Monographie)

    Caroline Weber

    Ein Review zum empfohlenen Einsatz von automatisierten Vorlesungsaufzeichnungen an Hochschulen.

    2020