@inproceedings{19788, abstract = {{März 2017}}, author = {{Büker, Petra}}, title = {{{Forschen – Irritieren – Reflektieren: Das Paderborner Zentrum für KinderBildungsForschung (KiBi-Z) unterstützt Studierende beim Lernen in der Praxis. Symposiumsbeitrag im Rahmen des 2. Internationalen Kongresses "Lernen in der Praxis - Professionalisierungsprozesse im Kontext schulpraktischer Studien in der Lehrerbildung" an der Ruhr-Universität Bochum}}}, year = {{2017}}, } @inproceedings{20134, author = {{Meyer, Sebastian and Meschut, Gerson and Behrens, Bernd-Arno and Hübner, Sven and Neumann, Andre}}, title = {{{Einbringen von Funktionselementen bei der Warmumformung von 22MnB5}}}, year = {{2017}}, } @article{20288, author = {{Folgar, Ribadas H. and Böddeker, T. and Chergui, A. and Ivanjko, Martin and Gili, F. and Behrens, S.}}, journal = {{Procedia Structural Integrity}}, pages = {{516--523}}, title = {{{Joining TWIP-Steel Simulation Models}}}, year = {{2017}}, } @inproceedings{20291, author = {{Böddeker, Tobias and Ivanjko, Martin and Chergui, Azeddine and Gili, Flavia and Behrens, Sabine and Runkel, Dirk and Mašek, Martin}}, booktitle = {{7. Fügetechnisches Gemeinschaftskolloquium}}, title = {{{JoiningTWIP – TWIP-steels for multi material design in automotive industry using low heat joining technologies II}}}, year = {{2017}}, } @inproceedings{20296, author = {{Günter, Heinrich and Janzen, Vitalij and Meschut, Gerson}}, booktitle = {{Tagungsband zum 7. Fügetechnischen Gemeinschaftskolloquium}}, location = {{Dresden}}, title = {{{Vorlochfreies Fügen stahlintensiver Leichtbaustrukturen durch vorkonfektioniertes und selbststanzendes Widerstandselementschweißen}}}, year = {{2017}}, } @techreport{2801, author = {{Kundisch, Dennis}}, pages = {{182--183}}, title = {{{Developing and Using an Audience Response System}}}, volume = {{60 (2)}}, year = {{2017}}, } @inproceedings{28022, author = {{Bloh, Bea and van Ophuysen, Stefanie and Behrmann, Lars and Homt, Martina and Schürer, Sina}}, location = {{Münster}}, title = {{{„Ich kann das Forschungsgedöns ja doch gebrauchen!“ – Zur Konzeption und Evaluation der Lehrveranstaltungen im Praxissemester an der WWU Münster}}}, year = {{2017}}, } @misc{28231, author = {{Bodden, Eric and Dressler, Falko and Meyer auf der Heide, Friedhelm and Scheytt, Christoph and Trächtler, Ansgar}}, isbn = {{978-3-942647-88-5}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Intelligente technische Systeme}}}, volume = {{369}}, year = {{2017}}, } @phdthesis{28232, author = {{Kühn, Arnon Theodor}}, isbn = {{978-3-942647-89-2}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur Release-Planung intelligenter technischer Systeme}}}, volume = {{370}}, year = {{2017}}, } @article{28345, author = {{Grimminger-Seidensticker, Elke and Möhwald, Aiko Julia}}, issn = {{1740-8989}}, journal = {{Physical Education and Sport Pedagogy}}, number = {{5}}, pages = {{445--458}}, title = {{{Intercultural education in physical education: results of a quasi-experimental intervention study with secondary school students}}}, doi = {{10.1080/17408989.2016.1225030}}, volume = {{22}}, year = {{2017}}, } @article{28348, abstract = {{This article explores the interplay between learners’ linguistic and personal objectives as well as evaluations of their achievements in study-abroad contexts, an area that has thus far remained widely unexplored given the prevalence of product-oriented, outcomes-based research. The study draws on the case of one Canadian student of German who studied abroad at a German university for one year. To adopt an emic perspective, the data gained from a learning history questionnaire, semi-structured interviews, and e-journals were analyzed and interpreted within the framework of narrative analysis. The results show not only that learners’ sojourn objectives may be complex, dynamic, and contradictory in nature but also that they need to be examined beyond their face value, as they are entangled with learners’ negotiations of desirable subject positions and attempts to integrate their sojourn experiences, successes, and frustrations in a coherent and positive life narrative.}}, author = {{Müller, Mareike}}, issn = {{0008-4506}}, journal = {{The Canadian Modern Language Review}}, keywords = {{individual differences, learner beliefs, narrative analysis, sojourn objectives and evaluations, study abroad}}, number = {{1}}, pages = {{24--47}}, title = {{{“As a person, I feel I’ve changed pretty immensely”: Sojourners’ aspirations and self-perceived achievements}}}, doi = {{10.3138/cmlr.3319}}, volume = {{73}}, year = {{2017}}, } @article{28354, abstract = {{This paper discusses the findings of an empirical study that explores the relationship between study-abroad experiences, learner identity, and pronunciation. We argue that the role of pronunciation as a personal domain of meaning-making warrants more attention than it has hitherto received. To this end, we investigate the narratives of Canadian learners, studying abroad in Germany, in relation to discourses of language learning, culture, and identity, using a Critical Discourse Analysis approach. Our data, which we gained from semi-structured interviews and e-journals, shows that learners’ perceptions of pronunciation are closely linked to their views of the native-speaker ideal, impacting their self-constructions and interpretations of learning experience. In conclusion, we argue for a more differentiated understanding of pronunciation and its implications for language teaching and study abroad.}}, author = {{Müller, Mareike and Schmenk, Barbara}}, issn = {{0802-6106}}, journal = {{International Journal of Applied Linguistics}}, keywords = {{learner identity, study abroad, pronunciation, native-speaker ideal, critical discourse analysis}}, number = {{1}}, pages = {{132--151}}, title = {{{Narrating the sound of self: The role of pronunciation in learners’ self-constructions in study-abroad contexts}}}, doi = {{10.1111/ijal.12109}}, volume = {{27}}, year = {{2017}}, } @misc{28359, author = {{Gausemeier, Jürgen}}, isbn = {{978-3-942647-93-9}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Vorausschau und Technologieplanung. 13. Symposium für Vorausschau und Technologieplanung, Heinz Nixdorf Institut, 23. und 24. November 2017}}}, volume = {{374}}, year = {{2017}}, } @inbook{28420, author = {{Homt, Martina and van Ophuysen, Stefanie}}, booktitle = {{Schulpraktische Lehrerprofessionalisierung als Ort der Zusammenarbeit}}, editor = {{Pilypaityte, Lina and Siller, Hans-Stefan}}, pages = {{255--260}}, publisher = {{Springer VS}}, title = {{{Gelingensbedingungen für den Aufbau einer forschenden Grundhaltung im Praxissemester – eine qualitative vergleichende Fallstudie}}}, doi = {{10.1007/978-3-658-17086-8_19}}, year = {{2017}}, } @inproceedings{28430, author = {{Homt, Martina and van Ophuysen, Stefanie}}, title = {{{Forschendes Lernen im Praxissemester – Der universitäre und schulische Kontext}}}, year = {{2017}}, } @inproceedings{28431, author = {{Homt, Martina}}, title = {{{Gelingensbedingungen für den Aufbau einer forschenden Grundhaltung im Praxissemester – eine qualitative vergleichende Fallstudie}}}, year = {{2017}}, } @inproceedings{2851, author = {{Markarian, Christine}}, booktitle = {{International Conference on Operations Research (OR)}}, location = {{Berlin}}, title = {{{Leasing with Uncertainty}}}, doi = {{10.1007/978-3-319-89920-6_57}}, year = {{2017}}, } @article{2856, abstract = {{Taxi ridesharing1 (TRS) is an advanced form of urban transportation that matches separate ride requests with similar spatio-temporal characteristics to a jointly used taxi. As collaborative consumption, TRS saves customers money, enables taxi companies to economize use of their resources, and lowers greenhouse gas emissions. We develop a one-to-one TRS approach that matches rides with similar start and end points. We evaluate our approach by analyzing an open dataset of > 5 million taxi trajectories in New York City. Our empirical analysis reveals that the proposed approach matches up to 48.34% of all taxi rides, saving 2,892,036 km of travel distance, 231,362.89 l of gas, and 532,134.64 kg of CO2 emissions per week. Compared to many-to-many TRS approaches, our approach is competitive, simpler to implement and operate, and poses less rigid assumptions on data availability and customer acceptance.}}, author = {{Barann, Benjamin and Beverungen, Daniel and Müller, Oliver}}, journal = {{Decision Support Systems}}, keywords = {{Taxi ridesharing Collaborative consumption Transportation Open data Sustainability Shared mobility}}, pages = {{86----95}}, title = {{{An open-data approach for quantifying the potential of taxi ridesharing}}}, doi = {{10.1016/j.dss.2017.05.008}}, year = {{2017}}, } @inproceedings{2860, abstract = {{Although many methods have been proposed for engineering services and customer solutions, most of these approaches give little consideration to recombinant service innovation. In an age of smart products and smart data, we can, however, expect that many of future service innovations need to be based on adding, transferring, dissociating, and associating existing value propositions. The purpose of this paper is to outline what properties constitute recombinant service innovation and to identify if current service engineering approaches fulfill these properties. Based on a conceptual in-depth analysis of 24 service engineering methods, we identify that most methods focus on designing value propositions instead of service systems, view service independent of physical goods, are linear or iterative, and incompletely address the mechanisms of recombinant innovation. We discuss how these deficiencies can be remedied and propose a first conceptual model of a revised se rvice system engineering approach.}}, author = {{Beverungen, Daniel and Lüttenberg, Hedda and Wolf, Verena}}, booktitle = {{Proceedings der 13. Internationalen Tagung Wirtschaftsinformatik (WI 2017)}}, editor = {{Leimeister, Jan Marco and Brenner, Walter}}, keywords = {{Service engineering, recombinant innovation, (product - )service system, literature analysis, new service development}}, location = {{St. Gallen, Switzerland}}, pages = {{136--150}}, title = {{{Recombinant Service System Engineering}}}, year = {{2017}}, } @article{28624, author = {{Eickelmann, Birgit and Drossel, Kerstin}}, journal = {{Dreizehn – Zeitschrift für Jugendsozialarbeit}}, pages = {{24--29}}, title = {{{Digitale Bildung – eine neue Perspektive auf Bildungsgerechtigkeit?}}}, volume = {{18}}, year = {{2017}}, } @inbook{28626, author = {{Gerick, Julia and Eickelmann, Birgit and Bos, Wilfried}}, booktitle = {{Individualisierung im Grundschulunterricht: Anspruch, Realisierung und Risiken }}, editor = {{Heinzel, Friederike and Koch, Katja}}, pages = {{131--136}}, publisher = {{Springer}}, title = {{{Zum Stellenwert neuer Technologien für die individuelle Förderung im Deutschunterricht in der Grundschule}}}, volume = {{21}}, year = {{2017}}, } @article{28627, author = {{Eickelmann, Birgit}}, journal = {{Tertium Comparationis. Journal für International und Interkulturell Vergleichende Erziehungswissenschaft}}, number = {{1}}, pages = {{47--61}}, title = {{{Computational Thinking als internationales Zusatzmodul zu ICILS 2018 – Konzeptionierung und Perspektiven für die empirische Bildungsforschung}}}, volume = {{23}}, year = {{2017}}, } @article{28628, author = {{Eickelmann, Birgit}}, journal = {{Neue Deutsche Schule. Die Zeitschrift der Bildungsgewerkschaft}}, number = {{14}}, title = {{{Digitalisierung. Neue Herausforderungen für Schulen und Schulaufsicht}}}, volume = {{9}}, year = {{2017}}, } @article{28629, author = {{Eickelmann, Birgit}}, journal = {{Zeitschrift Schul-Management}}, number = {{5}}, pages = {{15--19}}, title = {{{Digitale Kompetenzen im internationalen Vergleich. Welche Impulse geben die Studien ICILS 2013 und ICILS 2018?}}}, volume = {{48}}, year = {{2017}}, } @article{28630, author = {{Eickelmann, Birgit}}, journal = {{Basisartikel im Heft 'Digitalisierung in der Schule'. Lernende Schule}}, number = {{79}}, pages = {{4--9}}, title = {{{Lernende Schulen in der digitalen Welt – Herausforderungen und Perspektiven}}}, volume = {{20}}, year = {{2017}}, } @book{28631, author = {{Eickelmann, Birgit}}, publisher = {{Friedrich-Ebert-Stiftung}}, title = {{{Kompetenzen in der digitalen Welt. Konzepte und Perspektiven}}}, year = {{2017}}, } @inbook{28633, author = {{Eickelmann, Birgit and Gerick, Julia}}, booktitle = {{Lehren und Lernen mit digitalen Medien. Strategien, internationale Trends und pädagogische Orientierungen}}, editor = {{Scheiter, Katharina and Riecke-Baulecke, Thomas}}, pages = {{54--81}}, publisher = {{Oldenbourg}}, title = {{{Lehren und Lernen mit digitalen Medien - Zielsetzungen, Rahmenbedingungen und Implikationen für die Schulentwicklung}}}, volume = {{4}}, year = {{2017}}, } @inbook{28650, author = {{Eickelmann, Birgit}}, booktitle = {{Bildung im Digitalen Zeitalter - Bilanz und Perspektiven}}, editor = {{Nixdorf MuseumsForum, Heinz}}, pages = {{24--45}}, publisher = {{HNF}}, title = {{{Computer Literacy im schulischen Kontext – eine internationale Perspektive}}}, year = {{2017}}, } @article{28651, author = {{Eickelmann, Birgit and Drossel, Kerstin}}, journal = {{Medienimpulse}}, title = {{{Computer- und informationsbezogene Kompetenzen in der IEA-Studie ICILS 2013 und der Zusammenhang mit der Lesekompetenz}}}, doi = {{10.21243/mi-04-17-08}}, volume = {{4}}, year = {{2017}}, } @misc{28652, author = {{Gerick, Julia and Eickelmann, Birgit}}, publisher = {{Universität Hamburg/Universität Paderborn}}, title = {{{Abschlussbericht im Rahmen der wissenschaftlichen Begleitung der Evaluation des Projekts „Lernen mit digitalen Medien“ in Schleswig-Holstein}}}, year = {{2017}}, } @article{28653, author = {{Gerick, Julia and Eickelmann, Birgit and Rolff, Hans-Günter}}, journal = {{Journal für Schulentwicklung}}, number = {{3}}, pages = {{5--7}}, title = {{{Digitale Medien in Schule und Unterricht – Herausforderungen für die Schulentwicklung}}}, volume = {{21}}, year = {{2017}}, } @article{28655, author = {{Gerick, Julia and Eickelmann, Birgit and Ramm, Gesa and Kühn, Thore-Olaf}}, journal = {{Journal für Schulentwicklung}}, number = {{3}}, pages = {{8--14}}, title = {{{Gelingensbedingungen für den Transfer schulischer Innovationen mit digitalen Medien. Ergebnisse aus einem Modellprojekt}}}, volume = {{21}}, year = {{2017}}, } @article{28656, author = {{Eickelmann, Birgit}}, journal = {{Journal für Schulentwicklung}}, number = {{3}}, pages = {{49--52}}, title = {{{Schulische Medienkonzepte als Instrument der Schulentwicklung}}}, volume = {{21}}, year = {{2017}}, } @misc{28658, booktitle = {{Journal für Schulentwicklung}}, editor = {{Gerick, Julia and Eickelmann, Birgit and Kühn, Thore-Olaf}}, title = {{{Digitale Medien in Schule und Unterricht. Herausforderungen für die Schulentwicklung [Themenheft]}}}, year = {{2017}}, } @inbook{28659, author = {{Eickelmann, Birgit and Lorenz, Ramona and Endberg, Manuela}}, booktitle = {{Schule digital – der Länderindikator 2017. Schulische Medienbildung in der Sekundarstufe I mit besonderem Fokus auf MINT-Fächer im Bundesländervergleich und Trends von 2015 bis 2017}}, editor = {{Lorenz, Ramona and Bos, Wilfried and Endberg, Manuela and Eickelmann, Birgit and Grafe, Silke and Vahrenhold, Jan}}, pages = {{231--260}}, publisher = {{Waxmann}}, title = {{{Lernaktivitäten mit digitalen Medien im Fachunterricht der Sekundarstufe I im Bundesländervergleich mit besonderem Fokus auf MINT-Fächer}}}, year = {{2017}}, } @inbook{28663, author = {{Lorenz, Ramona and Endberg, Manuela and Eickelmann, Birgit}}, booktitle = {{Schule digital – der Länderindikator 2017. Schulische Medienbildung in der Sekundarstufe I mit besonderem Fokus auf MINT-Fächer im Bundesländervergleich und Trends von 2015 bis 2017}}, editor = {{Lorenz, Ramona and Bos, Wilfried and Endberg, Manuela and Eickelmann, Birgit and Grafe, Silke and Vahrenhold, Jan}}, pages = {{84--121}}, publisher = {{Waxmann}}, title = {{{Unterrichtliche Nutzung digitaler Medien durch Lehrpersonen in der Sekundarstufe I im Bundesländervergleich und im Trend von 2015 bis 2017}}}, year = {{2017}}, } @book{28665, editor = {{Lorenz, Ramona and Bos, Wilfried and Endberg, Manuela and Eickelmann, Birgit and Grafe, Silke and Vahrenhold, Jan}}, publisher = {{Waxmann}}, title = {{{Schule digital – der Länderindikator 2017. Schulische Medienbildung in der Sekundarstufe I mit besonderem Fokus auf MINT-Fächer im Bundesländervergleich und Trends von 2015 bis 2017}}}, year = {{2017}}, } @article{28669, author = {{Gerick, Julia and Eickelmann, Birgit and Bos, Wilfried}}, issn = {{2196-0739}}, journal = {{Large-scale Assessments in Education}}, number = {{1}}, pages = {{1--13}}, title = {{{School-level predictors for the use of ICT in schools and students’ CIL in international comparison}}}, doi = {{10.1186/s40536-017-0037-7}}, volume = {{5}}, year = {{2017}}, } @article{28670, author = {{Drossel, Kerstin and Eickelmann, Birgit and Gerick, Julia}}, issn = {{1360-2357}}, journal = {{Education and Information Technologies}}, number = {{2}}, pages = {{551--573}}, title = {{{Predictors of teachers’ use of ICT in school – the relevance of school characteristics, teachers’ attitudes and teacher collaboration}}}, doi = {{10.1007/s10639-016-9476-y}}, volume = {{22}}, year = {{2017}}, } @article{28671, author = {{Eickelmann, Birgit and Gerick, Julia and Koop, Christian}}, issn = {{1360-2357}}, journal = {{Education and Information Technologies}}, number = {{4}}, pages = {{1527--1551}}, title = {{{ICT use in mathematics lessons and the mathematics achievement of secondary school students by international comparison: Which role do school level factors play?}}}, doi = {{10.1007/s10639-016-9498-5}}, volume = {{22}}, year = {{2017}}, } @article{28672, abstract = {{ In the debate on the integration of information and communication technologies (ICT) into schools, the beliefs and attitudes of teachers towards ICT in teaching and learning have always been regarded as central criteria for successful implementation of new technologies. In this context, a study in 2013 by the International Association for the Evaluation of Educational Achievement, IEA, provided insights into teachers’ beliefs regarding ICT and showed that perceptions of the pedagogical advantages of technologies differ between countries. With regard to this finding, this paper seeks to determine whether there is a typology of teachers with different attitudes towards the potential of ICTs for learning. This question is addressed by conducting latent class analyses on a sample of teacher data from three European countries – the Czech Republic, Germany and Norway. Furthermore, the paper investigates how the use of computers by teachers varies between the groups to which these teachers can be assigned. In doing so the research reported at hand connects, arguably for the first time, representative data on teacher typologies of attitudes towards and beliefs about ICT in teaching and learning with data on computer use in schools. }}, author = {{Eickelmann, Birgit and Vennemann, Mario}}, issn = {{1474-9041}}, journal = {{European Educational Research Journal}}, number = {{6}}, pages = {{733--761}}, title = {{{Teachers‘ attitudes and beliefs regarding ICT in teaching and learning in European countries}}}, doi = {{10.1177/1474904117725899}}, volume = {{16}}, year = {{2017}}, } @article{28673, abstract = {{ The International Computer and Information Literacy Study (ICILS 2013) provides, for the first time, information about students’ computer and information literacy (CIL), as well as its acquisition, based on a computer-based test for students and background questionnaires. Among the 21 education systems that participated in ICILS 2013, there are 12 European countries, making secondary comparative in-depth analyses at a European level particularly fruitful. Accordingly, while the four articles in this Special Issue each deal with different topics and adopt different methodologies, they all share a common element and provide European comparisons in the ICILS context. The editorial in turn outlines the aim of the ICILS 2013 study and its relevance for European education research as well as its contextual framework and approach to the measurement of students’ CIL. The potential and challenges of such large-scale assessment studies are also discussed. }}, author = {{Gerick, Julia and Eickelmann, Birgit and Bos, Wilfried}}, issn = {{1474-9041}}, journal = {{European Educational Research Journal}}, number = {{6}}, pages = {{707--715}}, title = {{{The international computer and information literacy study from a European perspective: Introduction to the Special Issue}}}, doi = {{10.1177/1474904117735417}}, volume = {{16}}, year = {{2017}}, } @inbook{28675, author = {{Drossel, Kerstin and Eickelmann, Birgit}}, booktitle = {{Tomorrow's learning: involving everyone. Learning with and about technologies and computing }}, editor = {{Tatnall, Arthur and Webb, Mary}}, issn = {{1868-4238}}, pages = {{114--124}}, publisher = {{Springer International Publishing}}, title = {{{The Use of Tablets in Secondary Schools and Its Relationship with Computer Literacy}}}, doi = {{10.1007/978-3-319-74310-3_14}}, year = {{2017}}, } @inbook{28676, author = {{Eickelmann, Birgit}}, booktitle = {{Medienkompetenz. Herausforderung für Politik, politische Bildung und Medienbildung}}, editor = {{Gapski, Harald and Oberle, Monika and Staufer, Walter}}, pages = {{146--154}}, publisher = {{Bundeszentrale für Politische Bildung}}, title = {{{Schulische Medienkompetenzförderung}}}, year = {{2017}}, } @article{24109, author = {{Wiesener, Markus and Peters, K. and Taube, Alexander and Keller, Adrian and Hoyer, Kay-Peter and Niendorf, Thomas and Grundmeier, Guido}}, issn = {{0947-5117}}, journal = {{Materials and Corrosion}}, pages = {{1028--1036}}, title = {{{Corrosion properties of bioresorbable FeMn-Ag alloys prepared by selective laser melting}}}, doi = {{10.1002/maco.201709478}}, year = {{2017}}, } @inbook{24117, author = {{Taube, Alexander and Reschetnik, Wadim and Pauli, Lorenz and Hoyer, Kay-Peter and Kullmer, Gunter and Schaper, Mirko}}, booktitle = {{Additive Fertigung von Bauteilen und Strukturen}}, isbn = {{978-3-658-17779-9}}, publisher = {{Springer Vieweg}}, title = {{{Numerische und mechanische Untersuchung additiv gefertigter TiAl6V4 Gitterstrukturen}}}, doi = {{10.1007/978-3-658-17780-5_13}}, year = {{2017}}, } @inproceedings{24119, author = {{Brüggemann, Jan-Peter and Reschetnik, Wadim and Kullmer, Gunter and Richard, Hans Albert and Aydinöz, Mehmet Esat and Hoyer, Kay-Peter and Schaper, Mirko}}, booktitle = {{DVM - Tagung - Bruchmechanische Werkstoff- Und Bauteilbewertung: Beanspruchungsanalyse, Prüfmethoden und Anwendungen}}, pages = {{11--22}}, title = {{{Optimierung der Werkstoffeigenschaften von selektiv lasergeschmolzenem Alumi-nium 7075, }}}, year = {{2017}}, } @article{24152, author = {{Ramaswamy, Arunselvan and Bhatnagar, Shalabh}}, journal = {{IEEE Transactions on Automatic Control}}, number = {{5}}, pages = {{1465--1471}}, publisher = {{IEEE}}, title = {{{Analysis of gradient descent methods with nondiminishing bounded errors}}}, volume = {{63}}, year = {{2017}}, } @article{24153, author = {{Ramaswamy, Arunselvan and Bhatnagar, Shalabh}}, journal = {{Mathematics of Operations Research}}, number = {{3}}, pages = {{648--661}}, publisher = {{INFORMS}}, title = {{{A generalization of the Borkar-Meyn theorem for stochastic recursive inclusions}}}, volume = {{42}}, year = {{2017}}, } @inproceedings{24215, abstract = {{Wireless Sensor Networks (WSN) consist of large number of distributed sensors nodes which are able to sense, read and transmit physical measurements such as temperature, humidity and pressure over wireless communication links. WSN nodes are often powered by batteries or can use energy harvesting methods from environmental energy sources. One of the major challenges in the design of WSN nodes is the high level of power dissipation for sensing, processing and communication. Operating at low-power levels reduces maintenance effort for periodic battery replacement or can even provide unlimited operation by means of energy harvesting. Since the communication process is the most power hungry process, ultra-low-power wireless communication is an enabler for network applications such as cyber-physical systems, Internet-of-Things and Industry 4.0 etc. Our research is based on Wake-up Receivers (WuR) architectures. Each of the WSN nodes contains a WuR which is always-on, listening for a wake-up signal from other nodes or the base station, and activating the node only when a wake-up signal is detected. By this scheme the communication with the base station becomes asynchronous, real-time and on-demand. Due to the centrally-coordinated, collision-free communication such WSNs can be scaled to very large node numbers. Designing always-on WuR at ultra-low-power dissipation levels makes the WSN nodes very energy efficient because they are only activated when a wake-up-signal is received. Additionally, the WuR must be robust to noise and co-channel interference in order to operate safely in parallel to other wireless systems. We investigate a novel radio architecture for the WuR using Linear Frequency Modulation (LFM) and passive analog signal processing by means of a Surface Acoustic Wave (SAW) correlator. The base station sends the required WSN node ID using LFM signal at 2.4 GHz. The node ID is encoded as chirp up or chirp down signal with chirping bandwidth of 80MHz. On the receiver side, the SAW chirp correlator demodulates the received LFM signal while suppressing other wireless signals. In order to achieve proper demodulation and high Signal-to-Noise Ratio (SNR), the SAW correlator is designed to behave like a Matched Filter (MF) which boosts up the SNR. After that the signal is amplified/detected by baseband amplifier stage, it is compared with the unique ID of the node, and the node's Wake up signal is asserted accordingly. Since the SAW correlator operates completely passive, the WuR can be implemented in a very energy-efficient way, without the need to use power hungry device such as Low Noise Amplifiers (LNA) or down conversion Local Oscillators (LO)}}, author = {{Abughannam, Saed and Scheytt, Christoph}}, booktitle = {{Kleinheubacher Tagung 2017}}, pages = {{47}}, title = {{{ Low-Power wake up receiver based on Surface Acoustic Wave Correlator}}}, year = {{2017}}, }