@article{28011, author = {{Brand-Miller, Jennie and Buyken, Anette}}, issn = {{1078-8956}}, journal = {{Nature Medicine}}, pages = {{828--830}}, title = {{{Mapping postprandial responses sets the scene for targeted dietary advice}}}, doi = {{10.1038/s41591-020-0909-1}}, year = {{2020}}, } @article{28242, abstract = {{Abstract Background Due to the increasing use of information and communication technology, computer-related skills are important for all students in order to participate in the digital age (Fraillon, J., Ainley, J., Schulz, W., Friedman, T. & Duckworth, D. (2019). Preparing for life in a digital world: IEA International Computer and Information Literacy Study 2018 International Report. Amsterdam: International Association for the Evaluation of Educational Achievement (IEA). Retrieved from https://www.iea.nl/sites/default/files/2019-11/ICILS%202019%20Digital%20final%2004112019.pdf). Educational systems play a key role in the mediation of these skills (Eickelmann. Second Handbook of Information Technology in Primary and Secondary Education. Cham: Springer, 2018). However, previous studies have shown differences in students’ computer and information literacy (CIL). Although various approaches have been used to explain these differences, process data, such as response times, have never been taken into consideration. Based on data from the IEA-study ICILS 2013 of the Czech Republic, Denmark and Germany, this secondary analysis examines to what extent response times can be used as an explanatory approach for differences in CIL also within different groups of students according to student background characteristics (gender, socioeconomic background and immigrant background). Methods First, two processing profiles using a latent profile analysis (Oberski, D. (2016). Mixture Models: Latent Profile and Latent Class Analysis. In J. Robertson & M. Kaptein (Eds.), Modern Statistical Methods for HCI (pp. 275–287). Switzerland: Springer. 10.1007/978-3-319-26633-6) based on response times are determined—a fast and a slow processing profile. To detect how these profiles are related to students’ CIL, also in conjunction with students’ background characteristics (socioeconomic and immigrant background), descriptive statistics are used. Results The results show that in the Czech Republic and Germany, students belonging to the fast processing profile have on average significantly higher CIL than students allocated to the slow processing profile. In Denmark, there are no significant differences. Concerning the student background characteristics in the Czech Republic, there are significant negative time-on-task effects for all groups except for students with an immigrant background and students with a high parental occupational status. There are no significant differences in Denmark. For Germany, a significant negative time-on-task effect can be found among girls. However, the other examined indicators for Germany are ambiguous. Conclusions The results show that process data can be used to explain differences in students’ CIL: In the Czech Republic and Germany, there is a correlation between response times and CIL (significant negative time-on-task effect). Further analysis should also consider other aspects of CIL (e.g. reading literacy). What becomes clear, however, is that when interpreting and explaining differences in competence, data should also be included that relates to the completion process during testing. }}, author = {{Heldt, Melanie and Massek, Corinna and Drossel, Kerstin and Eickelmann, Birgit}}, issn = {{2196-0739}}, journal = {{Large-scale Assessments in Education}}, number = {{1}}, pages = {{1--20}}, title = {{{The relationship between differences in students’ computer and information literacy and response times: an analysis of IEA-ICILS data}}}, doi = {{10.1186/s40536-020-00090-1}}, volume = {{8}}, year = {{2020}}, } @article{2834, author = {{Gutt, Dominik and von Rechenberg, Tobias and Kundisch, Dennis}}, journal = {{Journal of Business Research}}, pages = {{277--287}}, publisher = {{Elsevier}}, title = {{{Goal Achievement, Subsequent User Effort and the Moderating Role of Goal Difficulty}}}, doi = {{10.1016/j.jbusres.2018.06.019}}, volume = {{106}}, year = {{2020}}, } @article{28341, author = {{Grimminger-Seidensticker, Elke and Möhwald, Aiko Julia}}, issn = {{1740-8989}}, journal = {{Physical Education and Sport Pedagogy}}, number = {{3}}, pages = {{316--329}}, title = {{{Enhancing social cohesion in PE classes within an intercultural learning program: results of a quasi-experimental intervention study}}}, doi = {{10.1080/17408989.2020.1741532}}, volume = {{25}}, year = {{2020}}, } @article{28351, abstract = {{This article investigates learners’ accounts of and reactions to interlocutors’ evaluations of their L2 pronunciation. Previous studies demonstrate both the pervasiveness of social evaluation processes in native and non-native speaker interactions and the impact of learners’ beliefs about pronunciation on their learning and communicative behavior. Adding to these strands of research, this project sheds light on how learners perceive evaluative reactions to their accents by native speakers and the relationship between such evaluations and learners’ reported evaluative, emotional and behavioral responses. The study draws on 8 international students at a German university. The data were collected in semi-structured interviews and analyzed within the framework of qualitative content analysis. The results give insight into conditions and strategies that may support learners in establishing constructive interpretations of the effects of their accents on their social acceptance.}}, author = {{Müller, Mareike and Settinieri, Julia}}, journal = {{Fremdsprachen Lehren und Lernen}}, number = {{2}}, pages = {{46--63}}, title = {{{"Solange dieser Mann gut Deutsch sprechen kann, ist auch kein Problem...": Evaluative Reaktionen auf einen L2-Akzent aus Sicht von Sprecher*innen}}}, doi = {{10.2357/FLuL-2020-0018}}, volume = {{49}}, year = {{2020}}, } @phdthesis{28367, author = {{Echterfeld, Julian}}, isbn = {{978-3-947647-12-5}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur Digitalisierung von Produktprogrammen}}}, volume = {{393}}, year = {{2020}}, } @phdthesis{28369, author = {{Lukei, Meinolf}}, isbn = {{978-3-947647-14-9}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur integrativen Entwicklung von mechatronischen Produkten und deren Prüfmittel}}}, volume = {{395}}, year = {{2020}}, } @phdthesis{28416, author = {{Homt, Martina}}, title = {{{Die Anbahnung einer forschenden Grundhaltung im Praxissemester – eine empirische Analyse von Bedingungen und Entwicklungsverläufen}}}, year = {{2020}}, } @inproceedings{24021, abstract = {{This paper presents a broadband track-and-hold amplifier (THA) based on switched-emitter-follower (SEF) topology. The THA exhibits both large- and small-signal bandwidth exeeding 60 GHz. It achieves an effective number of bits (ENOB) of 7 bit at 34 GHz input frequency and an ENOB of >5 bit over the whole input frequency bandwidth at sampling rate of 10 GS/s. Much higher sampling rates are possible but lead to somewhat worse performance. The chip was fabricated in a 130 nm SiGe BiCMOS technology from IHP (SG13G2). It draws 78 mA from a -4.8 V supply voltage, dissipating 375 mW.}}, author = {{Wu, Liang and Weizel, Maxim and Scheytt, Christoph}}, booktitle = {{2020 IEEE International Symposium on Circuits and Systems (ISCAS)}}, isbn = {{978-1-7281-3320-1}}, issn = {{2158-1525 }}, publisher = {{IEEE}}, title = {{{Above 60 GHz Bandwidth 10 GS/s Sampling Rate Track-and-Hold Amplifier in 130 nm SiGe BiCMOS Technology}}}, doi = {{10.1109/ISCAS45731.2020.9180947}}, year = {{2020}}, } @inproceedings{24022, abstract = {{In this paper we propose a novel low-power receiver architecture which uses a direct-detection receiver in combination with a 2.44 GHz 13 bit Barker Code SAW correlator for improvement of co-channel interference. Furthermore, to improve receiver sensitivity, a narrowband baseband correlator which uses pulse position modulation (PPM) is proposed. The receiver can be used as a Wake-up Receiver (WuRx) in Wireless Sensor Networks (WSN) to minimize the power dissipation and provide asynchronous and on-demand data communication. We present a rigorous analysis of the receiver. It shows that the RF front-end (SAW correlator and envelope detector) alone suffers from poor sensitivity due to the high baseband bandwidth and the absence of an RF low noise amplifier. However, by adding the narrowband correlator with an innovative Pulse Position Modulation (PPM) scheme, the overall sensitivity of the receiver reaches -63.1 dB with an improvement of 17.7 dB due to the use of the narrowband correlator that reduces the baseband bandwidth from 50 to 0.84 MHz. By scaling the narrowband correlator bandwidth further down, the receiver sensitivity can be further improved.}}, author = {{Abughannam, Saed and Scheytt, Christoph}}, booktitle = {{IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2020) }}, publisher = {{IEEE}}, title = {{{Sensitivity Analysis of a Low-Power Wake-Up Receiver Using an RF Barker Code SAW Correlator and a Baseband Narrowband Correlator}}}, doi = {{10.1109/PIMRC48278.2020.9217198}}, year = {{2020}}, } @inproceedings{24027, abstract = {{Fault effect simulation is a well-established technique for the qualification of robust embedded software and hardware as required by different safety standards. Our article introduces a Virtual Prototype based approach for the fault analysis and fast simulation of a set of automatically generated and target compiled software programs. The approach scales to different RISC-V ISA standard subset configurations and is based on an instruction and hardware register coverage for automatic fault injections of permanent and transient bitflips. The analysis of each software binary evaluates its opcode type and register access coverage including the addressed memory space. Based on this information dedicated sets of fault injected hardware models, i.e., mutants, are generated. The simulation of all mutants conducted with the different binaries finally identifies the cases with a normal termination though executed on a faulty hardware model. They are identified as a subject for further investigations and improvements by the implementation of additional hardware or software safety countermeasures. Our final evaluation results with automatic C code generation, compilation, analysis, and simulation show that QEMU provides an adequate efficient platform, which also scales to more complex scenarios.}}, author = {{Adelt, Peer and Koppelmann, Bastian and Müller, Wolfgang and Scheytt, Christoph}}, booktitle = {{MBMV 2020 - Methods and Description Languages for Modelling and Verification of Circuits and Systems; GMM/ITG/GI-Workshop}}, title = {{{A Scalable Platform for QEMU Based Fault Effect Analysis for RISC-V Hardware Architectures}}}, year = {{2020}}, } @article{24029, abstract = {{In this paper we present the system and circuit level analysis and feasibility study of applying microwave Radio Frequency Identification (RFID) systems with multipleinput multiple-output (MIMO) reader technology for tracking machining tools in multipath fading conditions of production environments. In the proposed system the MIMO reader interrogates single-antenna tags, and a high RFID frequency of 5.8 GHz is chosen to reduce the size of the reader's antenna array. According to the requirements dictated by the performed system analysis at 5.8 GHz, a low power fully integrated analog frontend (AFE) is designed and fabricated in a standard 65-nm CMOS technology for low power passive transponders. Performance of the Differential Drive Rectifier (DDR) topology as the core of the energy harvesting unit is investigated in detail. A multi-stage DDR power scavenging unit is dimensioned to provide a 1.2 V rectified voltage for 20-30 kQ load range, with a high power conversion efficiency (PCE) for high frequency and low input power level signals. The rectified voltage is then converted to a 1 V regulated voltage for the AFE and the baseband processor with 30 to 50 μW of estimated power consumption. Transistors with standard threshold voltage (VT) have been used for implementation. Measurements of the fabricated multi-stage configuration of the circuit show a maximum PCE of 68.8% at -12.46 dBm, and an input quality factor (Q-factor) of approximately 10. Amplitude-shift keying (ASK) demodulator and backscattering modulator with 80% modulation index, operating according to EPC-C1G2 protocol are applied for data transfer. The AFE consumes less than 1 μW in the reading mode. The AFE tag chip is 0.55 × 0.58 mm 2 .}}, author = {{Haddadian, Sanaz and Scheytt, Christoph}}, journal = {{IEEE Journal of Radio Frequency Identification}}, pages = {{1--1}}, title = {{{Analysis, Design and Implementation of a Fully Integrated Analog Front-End for Microwave RFIDs at 5.8 GHz to be Used with Compact MIMO Readers}}}, doi = {{10.1109/JRFID.2020.3009741}}, year = {{2020}}, } @inproceedings{24030, abstract = {{Low-power receivers use direct-detection receiver architecture for its design simplicity and its low power dissipation. However, the direct-detection based receivers suffer from co-channel interference which significantly degrades the communication reliability. Co-channel interference robustness can be improved by using a BPSK Barker code modulated Surface Acoustic Wave (SAW) correlator as a prior stage to the RF direct detection circuit. This paper reports in details the design, fabrication and measurements of a 2.45 GHz SAW correlator with 13 bits length Barker code. The device is fabricated on Lithium Niobate LiNbO3 substrate and it is composed of an input non-coded Inter Digital Transducers (IDT), a Piezoelectric substrate and an output coded IDT. The device wavelength λ is set to 1.6 μm, considering a phase velocity of the wave equal to 3970 m.s-1. Several configurations of the device were designed and fabricated, particularly varying the aperture and the non-coded IDT length to find out the optimal device configuration. All devices were found to operate with Insertion Loss (IL) ranging from 12 to 15 dB at 2.45 GHz with a tip probing measurement setup, while a packaged sample has an IL of 12.45 dB at 2.44 GHz mounted on a PCB with external 50 Ω LC matching network. Additionally, time-domain measurement for the packaged device shows that the output has a correlation peak with a peak-to-side-lobe (PSL) ratio of 4:1 for a -0.5 dBm input BPSK Barker code signal.}}, author = {{Ballandras, Sylvain and Abughannam, Saed and Courjon, Emilie and Scheytt, Christoph}}, booktitle = {{GeMiC 2020 - German Microwave Conference}}, title = {{{Design and Fabrication of Barker Coded Surface Acoustic Wave (SAW) Correlator at 2.45 GHz for Low-Power Wake-up Receivers}}}, year = {{2020}}, } @article{24031, author = {{Schraeder, Dirk Theodor and Schafran, Tommy and Geisen, Bärbel and Rubbert, Lisa}}, journal = {{Orthopädie Technik}}, pages = {{32--37}}, title = {{{Ein interdisziplinärer und akutmedizinischer Ansatz zur frühestmöglichen Intervention bei Patienten mit Diabetischem Fußsyndrom}}}, volume = {{71 (9)}}, year = {{2020}}, } @article{24120, abstract = {{Abstract In two-phase flows in which the Capillary number is low, errors in the computation of the surface tension force at the interface cause Front-Capturing methods such as Volume of Fluid (VOF) and Level-Set (LS) to develop interfacial spurious currents. To better solve low Capillary number flows, special treatment is required to reduce such spurious currents. Smoothing the phase indicator field to more accurately compute the curvature or adding interfacial artificial viscosity are techniques that can treat this problem. This study explores OpenFOAM, Fluent and StarCCM+ VOF solvers for the classical case of a static bubble/droplet immersed in a continuous aqueous phase, with the focus on the ability of these solvers to adequately reduce spurious currents. The results are expected to be helpful for practicing chemical engineers who use multiphase CFD solvers in their work.}}, author = {{Inguva, Venkatesh and Schulz, Andreas and Kenig, Eugeny Y.}}, issn = {{1934-2659}}, journal = {{Chemical Product and Process Modeling}}, title = {{{On methods to reduce spurious currents within VOF solver frameworks. Part 1: a review of the static bubble/droplet}}}, doi = {{10.1515/cppm-2020-0052}}, year = {{2020}}, } @misc{24133, author = {{Schöppner, Volker and Austermeier, Laura and Dietl, Kilian}}, booktitle = {{Blasformen & Extrusionswerkzeuge}}, keywords = {{Compoundieren, Doppenschneckenextruder, Energieeintrag}}, pages = {{7}}, title = {{{Der richtige Dreh für Simulationen}}}, year = {{2020}}, } @misc{24134, author = {{Schöppner, Volker and Austermeier, Laura and Dietl, Kilian}}, booktitle = {{K Zeitung}}, keywords = {{Compoundieren, Doppenschneckenextruder, Energieeintrag}}, title = {{{SKZ simuliert Doppelschnecke}}}, year = {{2020}}, } @inproceedings{24145, author = {{Ramaswamy, Arunselvan}}, booktitle = {{2020 28th Euromicro International Conference on Parallel, Distributed and Network-Based Processing (PDP)}}, pages = {{54--62}}, title = {{{DSPG: Decentralized Simultaneous Perturbations Gradient Descent Scheme}}}, year = {{2020}}, } @inproceedings{24146, author = {{Heid, Stefan Helmut and Ramaswamy, Arunselvan and Hüllermeier, Eyke}}, booktitle = {{Proceedings-30. Workshop Computational Intelligence: Berlin, 26.-27. November 2020}}, pages = {{247}}, title = {{{Constrained Multi-Agent Optimization with Unbounded Information Delay}}}, volume = {{26}}, year = {{2020}}, } @article{24147, author = {{Ramaswamy, Arunselvan and Bhatnagar, Shalabh and Quevedo, Daniel E}}, journal = {{IEEE Transactions on Automatic Control}}, publisher = {{IEEE}}, title = {{{Asynchronous stochastic approximations with asymptotically biased errors and deep multi-agent learning}}}, year = {{2020}}, }