[{"urn":"40467","_id":"4046","publisher":"American Physical Society (APS)","page":"041301(R)","volume":84,"user_id":"16199","ddc":["530"],"status":"public","has_accepted_license":"1","oa":"1","citation":{"mla":"Hübner, J., et al. “Electron G-Factor Anisotropy in Symmetric (110)-Oriented GaAs Quantum Wells.” <i>Physical Review B</i>, vol. 84, no. 4, American Physical Society (APS), 2011, p. 041301(R), doi:<a href=\"https://doi.org/10.1103/physrevb.84.041301\">10.1103/physrevb.84.041301</a>.","bibtex":"@article{Hübner_Kunz_Oertel_Schuh_Pochwała_Duc_Förstner_Meier_Oestreich_2011, title={Electron g-factor anisotropy in symmetric (110)-oriented GaAs quantum wells}, volume={84}, DOI={<a href=\"https://doi.org/10.1103/physrevb.84.041301\">10.1103/physrevb.84.041301</a>}, number={4}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Hübner, J. and Kunz, S. and Oertel, S. and Schuh, D. and Pochwała, M. and Duc, H. T. and Förstner, Jens and Meier, Torsten and Oestreich, M.}, year={2011}, pages={041301(R)} }","ama":"Hübner J, Kunz S, Oertel S, et al. Electron g-factor anisotropy in symmetric (110)-oriented GaAs quantum wells. <i>Physical Review B</i>. 2011;84(4):041301(R). doi:<a href=\"https://doi.org/10.1103/physrevb.84.041301\">10.1103/physrevb.84.041301</a>","ieee":"J. Hübner <i>et al.</i>, “Electron g-factor anisotropy in symmetric (110)-oriented GaAs quantum wells,” <i>Physical Review B</i>, vol. 84, no. 4, p. 041301(R), 2011, doi: <a href=\"https://doi.org/10.1103/physrevb.84.041301\">10.1103/physrevb.84.041301</a>.","apa":"Hübner, J., Kunz, S., Oertel, S., Schuh, D., Pochwała, M., Duc, H. T., Förstner, J., Meier, T., &#38; Oestreich, M. (2011). Electron g-factor anisotropy in symmetric (110)-oriented GaAs quantum wells. <i>Physical Review B</i>, <i>84</i>(4), 041301(R). <a href=\"https://doi.org/10.1103/physrevb.84.041301\">https://doi.org/10.1103/physrevb.84.041301</a>","chicago":"Hübner, J., S. Kunz, S. Oertel, D. Schuh, M. Pochwała, H. T. Duc, Jens Förstner, Torsten Meier, and M. Oestreich. “Electron G-Factor Anisotropy in Symmetric (110)-Oriented GaAs Quantum Wells.” <i>Physical Review B</i> 84, no. 4 (2011): 041301(R). <a href=\"https://doi.org/10.1103/physrevb.84.041301\">https://doi.org/10.1103/physrevb.84.041301</a>.","short":"J. Hübner, S. Kunz, S. Oertel, D. Schuh, M. Pochwała, H.T. Duc, J. Förstner, T. Meier, M. Oestreich, Physical Review B 84 (2011) 041301(R)."},"file_date_updated":"2018-09-04T19:28:55Z","language":[{"iso":"eng"}],"doi":"10.1103/physrevb.84.041301","publication_identifier":{"issn":["1098-0121","1550-235X"]},"author":[{"full_name":"Hübner, J.","last_name":"Hübner","first_name":"J."},{"full_name":"Kunz, S.","first_name":"S.","last_name":"Kunz"},{"last_name":"Oertel","first_name":"S.","full_name":"Oertel, S."},{"first_name":"D.","last_name":"Schuh","full_name":"Schuh, D."},{"first_name":"M.","last_name":"Pochwała","full_name":"Pochwała, M."},{"full_name":"Duc, H. T.","last_name":"Duc","first_name":"H. T."},{"last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens","id":"158"},{"full_name":"Meier, Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten","id":"344"},{"full_name":"Oestreich, M.","first_name":"M.","last_name":"Oestreich"}],"year":"2011","title":"Electron g-factor anisotropy in symmetric (110)-oriented GaAs quantum wells","article_type":"original","intvolume":"        84","publication_status":"published","date_updated":"2025-12-16T16:19:20Z","date_created":"2018-08-22T10:20:23Z","file":[{"content_type":"application/pdf","file_id":"4047","date_updated":"2018-09-04T19:28:55Z","relation":"main_file","file_size":339595,"access_level":"open_access","file_name":"2011 Hübner,Kunz,Örtel,Schuh,Pochwala,Duc,Förstner,Meier,Östreich_Electron g -factor anisotropy in symmetric (110)-oriented GaAs quantum wells.pdf","date_created":"2018-08-22T10:22:40Z","creator":"hclaudia"}],"department":[{"_id":"15"},{"_id":"293"},{"_id":"170"},{"_id":"230"},{"_id":"35"},{"_id":"34"},{"_id":"61"}],"type":"journal_article","keyword":["tet_topic_qw"],"publication":"Physical Review B","issue":"4","abstract":[{"lang":"eng","text":"We demonstrate by spin quantum beat spectroscopy that in undoped symmetric (110)-oriented GaAs/AlGaAs\r\nsingle quantum wells, even a symmetric spatial envelope wave function gives rise to an asymmetric in-plane\r\nelectron Land´e g-factor. The anisotropy is neither a direct consequence of the asymmetric in-plane Dresselhaus\r\nsplitting nor a direct consequence of the asymmetric Zeeman splitting of the hole bands, but rather it is a pure\r\nhigher-order effect that exists as well for diamond-type lattices. The measurements for various well widths are\r\nvery well described within 14 × 14 band k·p theory and illustrate that the electron spin is an excellent meter\r\nvariable for mapping out the internal—otherwise hidden—symmetries in two-dimensional systems. Fourth-order\r\nperturbation theory yields an analytical expression for the strength of the g-factor anisotropy, providing a\r\nqualitative understanding of the observed effects."}]},{"jel":["I24"],"status":"public","volume":21,"editor":[{"first_name":"Hartmut","last_name":"Giest","full_name":"Giest, Hartmut"},{"full_name":"Kaiser, Astrid","first_name":"Astrid","last_name":"Kaiser"},{"full_name":"Schomaker, Claudia","last_name":"Schomaker","first_name":"Claudia"}],"user_id":"105186","publisher":"Klinkhardt","_id":"31018","page":"97–106","citation":{"bibtex":"@inbook{Kullmann_Ziegler_Grygier_Hartinger_2011, place={Bad Heilbrunn}, series={PROBLEME UND PERSPEKTIVEN DES SACHUNTERRICHTS}, title={Das Modellprojekt “GribS” – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler}, volume={21}, booktitle={Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU}, publisher={Klinkhardt}, author={Kullmann, Harry and Ziegler, Florian and Grygier, Patricia and Hartinger, Andreas}, editor={Giest, Hartmut and Kaiser, Astrid and Schomaker, Claudia}, year={2011}, pages={97–106}, collection={PROBLEME UND PERSPEKTIVEN DES SACHUNTERRICHTS} }","ama":"Kullmann H, Ziegler F, Grygier P, Hartinger A. Das Modellprojekt “GribS” – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler. In: Giest H, Kaiser A, Schomaker C, eds. <i>Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU</i>. Vol 21. PROBLEME UND PERSPEKTIVEN DES SACHUNTERRICHTS. Klinkhardt; 2011:97–106.","mla":"Kullmann, Harry, et al. “Das Modellprojekt ‘GribS’ – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler.” <i>Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU</i>, edited by Hartmut Giest et al., vol. 21, Klinkhardt, 2011, pp. 97–106.","chicago":"Kullmann, Harry, Florian Ziegler, Patricia Grygier, and Andreas Hartinger. “Das Modellprojekt ‘GribS’ – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler.” In <i>Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU</i>, edited by Hartmut Giest, Astrid Kaiser, and Claudia Schomaker, 21:97–106. PROBLEME UND PERSPEKTIVEN DES SACHUNTERRICHTS. Bad Heilbrunn: Klinkhardt, 2011.","short":"H. Kullmann, F. Ziegler, P. Grygier, A. Hartinger, in: H. Giest, A. Kaiser, C. Schomaker (Eds.), Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU, Klinkhardt, Bad Heilbrunn, 2011, pp. 97–106.","ieee":"H. Kullmann, F. Ziegler, P. Grygier, and A. Hartinger, “Das Modellprojekt ‘GribS’ – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler,” in <i>Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU</i>, vol. 21, H. Giest, A. Kaiser, and C. Schomaker, Eds. Bad Heilbrunn: Klinkhardt, 2011, pp. 97–106.","apa":"Kullmann, H., Ziegler, F., Grygier, P., &#38; Hartinger, A. (2011). Das Modellprojekt “GribS” – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler. In H. Giest, A. Kaiser, &#38; C. Schomaker (Eds.), <i>Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU</i> (Vol. 21, pp. 97–106). Klinkhardt."},"oa":"1","place":"Bad Heilbrunn","intvolume":"        21","publication_status":"published","date_updated":"2026-08-29T07:18:30Z","publication_identifier":{"isbn":["3781517985"]},"author":[{"id":"77972","orcid":"0000-0001-5488-5105","first_name":"Harry","last_name":"Kullmann","full_name":"Kullmann, Harry"},{"first_name":"Florian","last_name":"Ziegler","full_name":"Ziegler, Florian"},{"last_name":"Grygier","first_name":"Patricia","full_name":"Grygier, Patricia"},{"full_name":"Hartinger, Andreas","first_name":"Andreas","last_name":"Hartinger"}],"title":"Das Modellprojekt \"GribS\" – Grundschulen zur individuellen Förderung bayerischer Schülerinnen und Schüler","year":"2011","series_title":"PROBLEME UND PERSPEKTIVEN DES SACHUNTERRICHTS","language":[{"iso":"ger"}],"main_file_link":[{"open_access":"1","url":"https://www.researchgate.net/publication/334303886_Das_Modellprojekt_GribS_-_Grundschulen_zur_individuellen_Forderung_bayerischer_Schulerinnen_und_Schuler"}],"abstract":[{"text":"Science education in German primary schools faces four major challenges. Issues related to chemistry and physics are widely neglected (1), often because teachers lack the indispensable content knowledge. If these issues are taught, however, hands-on experiments are rarely conducted (2). If such experiments are integrated into the teaching process, they are often not analyzed in a way so that students can broaden their concepts about science. Rather, the students are just conducting experiments by the book (3). As well, individual ways of knowledge achievement are not offered in a systematic fashion (4). This article describes the GribS-Project which takes on these challenges by a four year program of professional development and joint implementation of teaching innovations. Selected results show that teachers'\r\nknowledge of the topic “air” increased as result of participation in contentspecific training.","lang":"eng"}],"publication":"Sachunterricht - auf dem Weg zur Inklusion. 21. Jahresband der GDSU","department":[{"_id":"556"}],"type":"book_chapter","date_created":"2022-05-03T06:36:25Z"},{"department":[{"_id":"556"}],"type":"journal_article","date_created":"2022-04-05T10:35:23Z","abstract":[{"text":"Im Kontext der Debatte um Lehrerprofessionalität begegnet man mitunter der Formel des forschenden Habitus. Nähert man sich dessen programmatischer Bedeutung, trifft man auf viele Ziele, die vor dem Hintergrund des zugehörigen Forschungsstands plausibel sind. Unklar bleibt indes häufig, was mit dem forschenden Habitus konkret gemeint ist bzw. welche theoretischen Konzeptionen mit ihm verbunden werden. Es ergibt sich dann die Frage, welchen Beitrag der forschende Habitus zu einer um theoretische und sprachliche Präzision bemühten Debatte über Lehrerprofessionalität leisten kann. Letzteres auch deshalb, weil der Begriff zunächst gegenüber der Habituskonzeption des französischen Soziologen Pierre Bourdieu in Relation zu setzen wäre, welche den wissenschaftlichen Habitusdiskurs noch immer dominiert. Dem somit aufgespannten Problemfeld ist der vorliegende Beitrag gewidmet.","lang":"ger"}],"issue":"2","publication":"TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation","language":[{"iso":"ger"}],"main_file_link":[{"url":"https://www.researchgate.net/publication/323399916_Der_forschende_Habitus_als_Element_der_Lehrerprofessionalitat_-_eine_kritische_Analyse_anhand_der_Habituskonzeption_von_Pierre_Bourdieu","open_access":"1"}],"intvolume":"         6","article_type":"original","date_updated":"2026-08-29T08:43:06Z","publication_status":"published","author":[{"full_name":"Kullmann, Harry","last_name":"Kullmann","first_name":"Harry","orcid":"0000-0001-5488-5105","id":"77972"}],"publication_identifier":{"isbn":["978-3-643-99882-8"]},"year":"2011","title":"Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu","oa":"1","citation":{"mla":"Kullmann, Harry. “Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu.” <i>TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation</i>, vol. 6, no. 2, 2011, pp. 147–158.","ama":"Kullmann H. Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu. <i>TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation</i>. 2011;6(2):147–158.","bibtex":"@article{Kullmann_2011, title={Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu}, volume={6}, number={2}, journal={TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation}, author={Kullmann, Harry}, year={2011}, pages={147–158} }","apa":"Kullmann, H. (2011). Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu. <i>TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation</i>, <i>6</i>(2), 147–158.","ieee":"H. Kullmann, “Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu,” <i>TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation</i>, vol. 6, no. 2, pp. 147–158, 2011.","short":"H. Kullmann, TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation 6 (2011) 147–158.","chicago":"Kullmann, Harry. “Der forschende Habitus als Element der Lehrerprofessionalität – eine kritische Analyse anhand der Habituskonzeption von Pierre Bourdieu.” <i>TriOS – Forum für schulnahe Forschung, Schulentwicklung und Evaluation</i> 6, no. 2 (2011): 147–158."},"volume":6,"user_id":"105186","_id":"30781","page":"147–158","jel":["I21"],"status":"public"},{"date_updated":"2022-01-06T07:02:32Z","title":"Applying heuristic methods for job scheduling in storage markets","year":"2010","author":[{"first_name":"Josef","last_name":"Finkbeiner","full_name":"Finkbeiner, Josef"},{"last_name":"Bodenstein","first_name":"Christian","full_name":"Bodenstein, Christian"},{"last_name":"Schryen","first_name":"Guido","full_name":"Schryen, Guido","id":"72850"},{"first_name":"Dirk","last_name":"Neumann","full_name":"Neumann, Dirk"}],"language":[{"iso":"eng"}],"abstract":[{"text":"In double-sided markets for computing resources an optimal allocation schedule among job offers and requests subject to relevant capacity constraints can be determined. With increasing storage demands and emerging storage services the question how to schedule storage jobs becomes more and more interesting. Since such scheduling problems are often in the class NP-complete an exact computation is not feasible in practice. On the other hand an approximation to the optimal solution can easily be found by means of using heuristics. The problem with this attempt is that the suggested solution may not be exactly optimal and is thus less satisfying. Considering the two above mentioned solution approaches one can clearly find a trade-off between the optimality of the solution and the efficiency to get to a solution at all. This work proposes to apply and combine heuristics in optimization to gain from both of their benefits while reducing the problematic aspects. Following this method it is assumed to get closer to the optimal solution in a shorter time compared to a full optimization.","lang":"eng"}],"extern":"1","publication":"18th European Conference on Information Systems (ECIS 2010)","type":"conference","keyword":["Decision Support System","Algorithms","Optimization","Market Engineering"],"department":[{"_id":"277"}],"file":[{"relation":"main_file","date_updated":"2018-12-13T15:19:40Z","file_name":"s1-ln7055316-1881058806-1939656818Hwf-1884822883IdV-5442784107055316PDF_HI0001.pdf","file_size":171336,"access_level":"open_access","file_id":"6188","content_type":"application/pdf","creator":"hsiemes","date_created":"2018-12-11T15:21:06Z"}],"date_created":"2018-11-14T15:45:11Z","has_accepted_license":"1","status":"public","ddc":["000"],"user_id":"61579","_id":"5685","file_date_updated":"2018-12-13T15:19:40Z","citation":{"ieee":"J. Finkbeiner, C. Bodenstein, G. Schryen, and D. Neumann, “Applying heuristic methods for job scheduling in storage markets,” in <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","apa":"Finkbeiner, J., Bodenstein, C., Schryen, G., &#38; Neumann, D. (2010). Applying heuristic methods for job scheduling in storage markets. In <i>18th European Conference on Information Systems (ECIS 2010)</i>.","mla":"Finkbeiner, Josef, et al. “Applying Heuristic Methods for Job Scheduling in Storage Markets.” <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","bibtex":"@inproceedings{Finkbeiner_Bodenstein_Schryen_Neumann_2010, title={Applying heuristic methods for job scheduling in storage markets}, booktitle={18th European Conference on Information Systems (ECIS 2010)}, author={Finkbeiner, Josef and Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}, year={2010} }","ama":"Finkbeiner J, Bodenstein C, Schryen G, Neumann D. Applying heuristic methods for job scheduling in storage markets. In: <i>18th European Conference on Information Systems (ECIS 2010)</i>. ; 2010.","short":"J. Finkbeiner, C. Bodenstein, G. Schryen, D. Neumann, in: 18th European Conference on Information Systems (ECIS 2010), 2010.","chicago":"Finkbeiner, Josef, Christian Bodenstein, Guido Schryen, and Dirk Neumann. “Applying Heuristic Methods for Job Scheduling in Storage Markets.” In <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010."},"oa":"1"},{"date_created":"2018-11-14T15:48:39Z","file":[{"date_created":"2018-12-11T15:22:41Z","creator":"hsiemes","content_type":"application/pdf","file_id":"6191","file_size":247621,"access_level":"open_access","file_name":"Take it or leave it - ECIS - Proof.pdf","date_updated":"2018-12-13T15:20:13Z","relation":"main_file"}],"department":[{"_id":"277"}],"keyword":["Posted Price","Ultimatum Game","Energy Efficiency","Mechanism Design"],"type":"conference","publication":"18th European Conference on Information Systems (ECIS 2010)","abstract":[{"lang":"eng","text":"In a world, where more and more businesses seem to trade in an online market, the supply of online services to supply the ever-growing demand could quickly reach its capacity limits. Online service providers may find themselves maxed out at peak operation levels during high-traffic timeslots but too little demand during low-traffic timeslots, although the latter is becoming less frequent. At this point not only deciding which user is allocated what level of service becomes essential, but also the magnitude of the service provided, can be controlled by pricing. Pricing is an important factor when efficient and acceptable allocation of resources between individuals must be reached. Without prices, transferring or sharing goods would be impossible. In sharing information, pricing a product however is not as simple as relatively pricing an apple or a pear. Often the costs, and hence the prices are simply unknown. Backed by this scenario, the online services market could be combined with the market design mechanism of diamonds. For this we propose an ultimatum pricing strategy which effectively allows for valuations to be accounted for, but no longer a necessity when pricing in grid, cloud or other online computing environments."}],"extern":"1","language":[{"iso":"eng"}],"author":[{"full_name":"Bodenstein, Christian","last_name":"Bodenstein","first_name":"Christian"},{"id":"72850","first_name":"Guido","last_name":"Schryen","full_name":"Schryen, Guido"},{"first_name":"Dirk","last_name":"Neumann","full_name":"Neumann, Dirk"}],"title":"From \"Take-it-or-leave-it\" offers to \"Take-it-or-be-left-out\" Ultimatum - A trade mechanism for Online Services","year":"2010","date_updated":"2022-01-06T07:02:34Z","oa":"1","citation":{"ieee":"C. Bodenstein, G. Schryen, and D. Neumann, “From ‘Take-it-or-leave-it’ offers to ‘Take-it-or-be-left-out’ Ultimatum - A trade mechanism for Online Services,” in <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","apa":"Bodenstein, C., Schryen, G., &#38; Neumann, D. (2010). From “Take-it-or-leave-it” offers to “Take-it-or-be-left-out” Ultimatum - A trade mechanism for Online Services. In <i>18th European Conference on Information Systems (ECIS 2010)</i>.","chicago":"Bodenstein, Christian, Guido Schryen, and Dirk Neumann. “From ‘Take-It-or-Leave-It’ Offers to ‘Take-It-or-Be-Left-out’ Ultimatum - A Trade Mechanism for Online Services.” In <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","short":"C. Bodenstein, G. Schryen, D. Neumann, in: 18th European Conference on Information Systems (ECIS 2010), 2010.","mla":"Bodenstein, Christian, et al. “From ‘Take-It-or-Leave-It’ Offers to ‘Take-It-or-Be-Left-out’ Ultimatum - A Trade Mechanism for Online Services.” <i>18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","bibtex":"@inproceedings{Bodenstein_Schryen_Neumann_2010, title={From “Take-it-or-leave-it” offers to “Take-it-or-be-left-out” Ultimatum - A trade mechanism for Online Services}, booktitle={18th European Conference on Information Systems (ECIS 2010)}, author={Bodenstein, Christian and Schryen, Guido and Neumann, Dirk}, year={2010} }","ama":"Bodenstein C, Schryen G, Neumann D. From “Take-it-or-leave-it” offers to “Take-it-or-be-left-out” Ultimatum - A trade mechanism for Online Services. In: <i>18th European Conference on Information Systems (ECIS 2010)</i>. ; 2010."},"file_date_updated":"2018-12-13T15:20:13Z","_id":"5690","ddc":["000"],"user_id":"61579","status":"public","has_accepted_license":"1"},{"issue":"11","publication":"Physical Review B","abstract":[{"lang":"eng","text":"A quantum dot molecule doped with a single electron in the presence of diagonal and off-diagonal carrierphonon\r\ncouplings is studied by means of a nonperturbative quantum kinetic theory. The interaction with acoustic phonons by deformation potential and piezoelectric coupling is taken into account. We show that the phonon-mediated relaxation is fast on a picosecond time scale and is dominated by the usually neglected off-diagonal coupling to the lattice degrees of freedom leading to phonon-assisted electron tunneling. We show that in the parameter regime of current electrical and optical experiments, the microscopic non-Markovian theory has to be employed."}],"file":[{"date_created":"2018-08-28T08:58:21Z","creator":"hclaudia","file_id":"4175","content_type":"application/pdf","relation":"main_file","date_updated":"2018-09-04T19:58:41Z","file_name":"2010 Grodecka-Grad,Förstner_Theory of phonon-mediated relaxation in doped quantum dot molecules.pdf","file_size":680408,"access_level":"open_access"}],"date_created":"2018-08-28T08:57:24Z","keyword":["tet_topic_qd"],"type":"journal_article","department":[{"_id":"15"}],"year":"2010","title":"Theory of phonon-mediated relaxation in doped quantum dot molecules","publication_identifier":{"issn":["1098-0121","1550-235X"]},"author":[{"full_name":"Grodecka-Grad, A.","first_name":"A.","last_name":"Grodecka-Grad"},{"last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens","id":"158"}],"date_updated":"2022-01-06T07:00:29Z","publication_status":"published","intvolume":"        81","article_type":"original","article_number":"115305","language":[{"iso":"eng"}],"doi":"10.1103/physrevb.81.115305","file_date_updated":"2018-09-04T19:58:41Z","citation":{"ieee":"A. Grodecka-Grad and J. Förstner, “Theory of phonon-mediated relaxation in doped quantum dot molecules,” <i>Physical Review B</i>, vol. 81, no. 11, 2010.","apa":"Grodecka-Grad, A., &#38; Förstner, J. (2010). Theory of phonon-mediated relaxation in doped quantum dot molecules. <i>Physical Review B</i>, <i>81</i>(11). <a href=\"https://doi.org/10.1103/physrevb.81.115305\">https://doi.org/10.1103/physrevb.81.115305</a>","short":"A. Grodecka-Grad, J. Förstner, Physical Review B 81 (2010).","chicago":"Grodecka-Grad, A., and Jens Förstner. “Theory of Phonon-Mediated Relaxation in Doped Quantum Dot Molecules.” <i>Physical Review B</i> 81, no. 11 (2010). <a href=\"https://doi.org/10.1103/physrevb.81.115305\">https://doi.org/10.1103/physrevb.81.115305</a>.","mla":"Grodecka-Grad, A., and Jens Förstner. “Theory of Phonon-Mediated Relaxation in Doped Quantum Dot Molecules.” <i>Physical Review B</i>, vol. 81, no. 11, 115305, American Physical Society (APS), 2010, doi:<a href=\"https://doi.org/10.1103/physrevb.81.115305\">10.1103/physrevb.81.115305</a>.","bibtex":"@article{Grodecka-Grad_Förstner_2010, title={Theory of phonon-mediated relaxation in doped quantum dot molecules}, volume={81}, DOI={<a href=\"https://doi.org/10.1103/physrevb.81.115305\">10.1103/physrevb.81.115305</a>}, number={11115305}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Grodecka-Grad, A. and Förstner, Jens}, year={2010} }","ama":"Grodecka-Grad A, Förstner J. Theory of phonon-mediated relaxation in doped quantum dot molecules. <i>Physical Review B</i>. 2010;81(11). doi:<a href=\"https://doi.org/10.1103/physrevb.81.115305\">10.1103/physrevb.81.115305</a>"},"oa":"1","status":"public","has_accepted_license":"1","publisher":"American Physical Society (APS)","_id":"4174","urn":"41740","ddc":["530"],"user_id":"158","volume":81},{"status":"public","has_accepted_license":"1","_id":"5598","user_id":"61579","ddc":["000"],"citation":{"apa":"Volkamer, M., &#38; Schryen, G. (2010). Measuring eTrust in distributed systems - General Concept and Application to Internet Voting. In <i>Proceedings of the 23rd Bled eConference</i>.","ieee":"M. Volkamer and G. Schryen, “Measuring eTrust in distributed systems - General Concept and Application to Internet Voting,” in <i>Proceedings of the 23rd Bled eConference</i>, 2010.","short":"M. Volkamer, G. Schryen, in: Proceedings of the 23rd Bled EConference, 2010.","chicago":"Volkamer, Melanie, and Guido Schryen. “Measuring ETrust in Distributed Systems - General Concept and Application to Internet Voting.” In <i>Proceedings of the 23rd Bled EConference</i>, 2010.","mla":"Volkamer, Melanie, and Guido Schryen. “Measuring ETrust in Distributed Systems - General Concept and Application to Internet Voting.” <i>Proceedings of the 23rd Bled EConference</i>, 2010.","ama":"Volkamer M, Schryen G. Measuring eTrust in distributed systems - General Concept and Application to Internet Voting. In: <i>Proceedings of the 23rd Bled EConference</i>. ; 2010.","bibtex":"@inproceedings{Volkamer_Schryen_2010, title={Measuring eTrust in distributed systems - General Concept and Application to Internet Voting}, booktitle={Proceedings of the 23rd Bled eConference}, author={Volkamer, Melanie and Schryen, Guido}, year={2010} }"},"file_date_updated":"2018-12-13T15:16:50Z","oa":"1","author":[{"last_name":"Volkamer","first_name":"Melanie","full_name":"Volkamer, Melanie"},{"full_name":"Schryen, Guido","last_name":"Schryen","first_name":"Guido","id":"72850"}],"year":"2010","title":"Measuring eTrust in distributed systems - General Concept and Application to Internet Voting","date_updated":"2022-01-06T07:02:06Z","language":[{"iso":"eng"}],"publication":"Proceedings of the 23rd Bled eConference","extern":"1","abstract":[{"text":"Emerging digital environments and infrastructures, such as distributed services and computing services, have generated new options of communication, information sharing, and resource utilization in past years. Different distributed trust concepts are applied to increase trust in such systems. However, these concepts yield to rather complex architectures which make it difficult to determine which component or system needs to be trusted. This paper presents a novel trust measurement method for distributed systems which enables the t identification of weak points in the overall system architecture. The measurement method includes the specification of a formal trust language and its representation by means of propositional logic formulas. The applicability of the proposed concepts is demonstrated by conducting a case study on the Internet voting system that was used in the 2007 parliamentary elections in Estonia.","lang":"eng"}],"date_created":"2018-11-14T11:49:50Z","file":[{"date_created":"2018-12-11T15:14:05Z","creator":"hsiemes","content_type":"application/pdf","file_id":"6185","date_updated":"2018-12-13T15:16:50Z","relation":"main_file","file_size":243413,"access_level":"open_access","file_name":"06_Schryen.pdf"}],"department":[{"_id":"277"}],"keyword":["distributed trust concepts","measuring etrust","Internet voting"],"type":"conference"},{"ddc":["000"],"user_id":"61579","language":[{"iso":"eng"}],"_id":"5631","has_accepted_license":"1","date_updated":"2022-01-06T07:02:14Z","author":[{"full_name":"Schryen, Guido","last_name":"Schryen","first_name":"Guido","id":"72850"},{"first_name":"Rich","last_name":"Eliot","full_name":"Eliot, Rich"}],"title":"Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question","status":"public","year":"2010","oa":"1","department":[{"_id":"277"}],"type":"conference","date_created":"2018-11-14T14:23:45Z","file":[{"date_created":"2018-12-11T15:23:33Z","creator":"hsiemes","file_id":"6192","content_type":"application/pdf","file_name":"vendors behavior - UPDATED IEEE version.pdf","access_level":"open_access","file_size":299380,"relation":"main_file","date_updated":"2018-12-13T15:20:23Z"}],"abstract":[{"lang":"eng","text":"While many theoretical arguments against or in favor of open source and closed source software development have been presented, the empirical basis for the assessment of arguments and the development of models is still weak. Addressing this research gap, this paper presents the first comprehensive empirical investigation of published vulnerabilities and patches of 17 widely deployed open source and closed source software packages, including operating systems, database systems, web browsers, email clients, and office systems. The empirical analysis uses comprehensive vulnerability data contained in the NIST National Vulnerability Database and a newly compiled data set of vulnerability patches. The results suggest that it is not the particular software development style that determines the severity of vulnerabilities and vendors? patching behavior, but rather the specific application type and the policy of the particular development community, respectively."}],"extern":"1","citation":{"apa":"Schryen, G., &#38; Eliot, R. (2010). Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question. In <i>43rd Annual Hawaii International Conference on System Sciences</i>.","ieee":"G. Schryen and R. Eliot, “Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question,” in <i>43rd Annual Hawaii International Conference on System Sciences</i>, 2010.","chicago":"Schryen, Guido, and Rich Eliot. “Increasing Software Security through Open Source or Closed Source Development? Empirics Suggest That We Have Asked the Wrong Question.” In <i>43rd Annual Hawaii International Conference on System Sciences</i>, 2010.","short":"G. Schryen, R. Eliot, in: 43rd Annual Hawaii International Conference on System Sciences, 2010.","mla":"Schryen, Guido, and Rich Eliot. “Increasing Software Security through Open Source or Closed Source Development? Empirics Suggest That We Have Asked the Wrong Question.” <i>43rd Annual Hawaii International Conference on System Sciences</i>, 2010.","ama":"Schryen G, Eliot R. Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question. In: <i>43rd Annual Hawaii International Conference on System Sciences</i>. ; 2010.","bibtex":"@inproceedings{Schryen_Eliot_2010, title={Increasing software security through open source or closed source development? Empirics suggest that we have asked the wrong question}, booktitle={43rd Annual Hawaii International Conference on System Sciences}, author={Schryen, Guido and Eliot, Rich}, year={2010} }"},"publication":"43rd Annual Hawaii International Conference on System Sciences","file_date_updated":"2018-12-13T15:20:23Z"},{"language":[{"iso":"eng"}],"date_updated":"2022-01-06T07:02:14Z","author":[{"id":"72850","last_name":"Schryen","first_name":"Guido","full_name":"Schryen, Guido"},{"full_name":"Bodenstein, Christian","last_name":"Bodenstein","first_name":"Christian"}],"title":"A decision-theoretic foundation of IS business value research","year":"2010","department":[{"_id":"277"}],"type":"conference","keyword":["Decision theory","IT value","IS assessment","IS evaluation"],"date_created":"2018-11-14T14:24:25Z","file":[{"date_created":"2018-12-11T15:24:22Z","creator":"hsiemes","content_type":"application/pdf","file_id":"6193","file_size":174368,"access_level":"open_access","file_name":"IS business value - ECIS - Final Version.pdf","date_updated":"2018-12-13T15:20:37Z","relation":"main_file"}],"extern":"1","abstract":[{"text":"Enduring doubts about the value of IS investments reveal that IS researchers have not fully managed to identify and to explain the economic benefits of IS. Three research tasks are essential requisites on the path towards addressing this criticism: the synthesis of knowledge, the identification of lack of knowledge, and the proposition of paths for closing knowledge gaps. This paper considers each of these tasks by a) synthesizing key research findings based on a comprehensive literature review, b) identifying and unfolding key limitations of current research, and c) applying a decision-theoretic perspective, which opens new horizons to IS business value research and shows paths for overcoming the limitations. The adoption of this perspective results in a decision-theoretic foundation of IS business value research and includes the proposition of a consistent terminology and a research model that frames further research.","lang":"eng"}],"publication":"Proceedings of the 18th European Conference on Information Systems (ECIS 2010)","user_id":"61579","ddc":["000"],"_id":"5632","has_accepted_license":"1","status":"public","oa":"1","citation":{"ama":"Schryen G, Bodenstein C. A decision-theoretic foundation of IS business value research. In: <i>Proceedings of the 18th European Conference on Information Systems (ECIS 2010)</i>. ; 2010.","bibtex":"@inproceedings{Schryen_Bodenstein_2010, title={A decision-theoretic foundation of IS business value research}, booktitle={Proceedings of the 18th European Conference on Information Systems (ECIS 2010)}, author={Schryen, Guido and Bodenstein, Christian}, year={2010} }","mla":"Schryen, Guido, and Christian Bodenstein. “A Decision-Theoretic Foundation of IS Business Value Research.” <i>Proceedings of the 18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","chicago":"Schryen, Guido, and Christian Bodenstein. “A Decision-Theoretic Foundation of IS Business Value Research.” In <i>Proceedings of the 18th European Conference on Information Systems (ECIS 2010)</i>, 2010.","short":"G. Schryen, C. Bodenstein, in: Proceedings of the 18th European Conference on Information Systems (ECIS 2010), 2010.","apa":"Schryen, G., &#38; Bodenstein, C. (2010). A decision-theoretic foundation of IS business value research. In <i>Proceedings of the 18th European Conference on Information Systems (ECIS 2010)</i>.","ieee":"G. Schryen and C. Bodenstein, “A decision-theoretic foundation of IS business value research,” in <i>Proceedings of the 18th European Conference on Information Systems (ECIS 2010)</i>, 2010."},"file_date_updated":"2018-12-13T15:20:37Z"},{"citation":{"ieee":"G. Schryen, “A Fuzzy Model for IT Security Investments,” in <i>Sicherheit 2010 : Sicherheit, Schutz und Zuverl{\\\"a}ssigkeit ; Konferenzband der 5. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft f{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin</i>, 2010, vol. 170, pp. 289–304.","apa":"Schryen, G. (2010). A Fuzzy Model for IT Security Investments. In F. C. Freiling (Ed.), <i>Sicherheit 2010 : Sicherheit, Schutz und Zuverl{\\\"a}ssigkeit ; Konferenzband der 5. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft f{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin</i> (Vol. 170, pp. 289–304). Bonn: Gesellschaft für Informatik.","short":"G. Schryen, in: F. C. Freiling (Ed.), Sicherheit 2010 : Sicherheit, Schutz Und Zuverl{\\\"a}ssigkeit ; Konferenzband Der 5. Jahrestagung Des Fachbereichs Sicherheit Der Gesellschaft F{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin, Gesellschaft für Informatik, Bonn, 2010, pp. 289–304.","chicago":"Schryen, Guido. “A Fuzzy Model for IT Security Investments.” In <i>Sicherheit 2010 : Sicherheit, Schutz Und Zuverl{\\\"a}ssigkeit ; Konferenzband Der 5. Jahrestagung Des Fachbereichs Sicherheit Der Gesellschaft F{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin</i>, edited by Felix C. Freiling, 170:289–304. GI-Edition: Lecture Notes in Informatics. Proceedings. Bonn: Gesellschaft für Informatik, 2010.","mla":"Schryen, Guido. “A Fuzzy Model for IT Security Investments.” <i>Sicherheit 2010 : Sicherheit, Schutz Und Zuverl{\\\"a}ssigkeit ; Konferenzband Der 5. Jahrestagung Des Fachbereichs Sicherheit Der Gesellschaft F{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin</i>, edited by Felix C. Freiling, vol. 170, Gesellschaft für Informatik, 2010, pp. 289–304.","bibtex":"@inproceedings{Schryen_2010, place={Bonn}, series={GI-Edition: lecture notes in informatics. Proceedings}, title={A Fuzzy Model for IT Security Investments}, volume={170}, booktitle={Sicherheit 2010 : Sicherheit, Schutz und Zuverl{\\\"a}ssigkeit ; Konferenzband der 5. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft f{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin}, publisher={Gesellschaft für Informatik}, author={Schryen, Guido}, editor={C. Freiling, FelixEditor}, year={2010}, pages={289–304}, collection={GI-Edition: lecture notes in informatics. Proceedings} }","ama":"Schryen G. A Fuzzy Model for IT Security Investments. In: C. Freiling F, ed. <i>Sicherheit 2010 : Sicherheit, Schutz Und Zuverl{\\\"a}ssigkeit ; Konferenzband Der 5. Jahrestagung Des Fachbereichs Sicherheit Der Gesellschaft F{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin</i>. Vol 170. GI-Edition: lecture notes in informatics. Proceedings. Bonn: Gesellschaft für Informatik; 2010:289-304."},"file_date_updated":"2018-12-13T15:20:03Z","place":"Bonn","oa":"1","status":"public","has_accepted_license":"1","publisher":"Gesellschaft für Informatik","_id":"5642","page":"289-304","volume":170,"editor":[{"full_name":"C. Freiling, Felix","last_name":"C. Freiling","first_name":"Felix"}],"user_id":"61579","ddc":["000"],"publication":"Sicherheit 2010 : Sicherheit, Schutz und Zuverl{\\\"a}ssigkeit ; Konferenzband der 5. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft f{\\\"u}r Informatik e.V. (GI), 5. - 7. Oktober 2010 in Berlin","extern":"1","abstract":[{"lang":"eng","text":"This paper presents a fuzzy set based decision support model for taking uncertainty into account when making security investment decisions for distributed systems. The proposed model is complementary to robabilistic approaches and useful in situations where probabilistic information is either unavailable or not appropriate to reliably predict future conditions. We ?rst present the speci?cation of a formal security language that allows to specify under which conditions a distributed system is protected against security violations. We show that each term of the security language can be transformed into an equivalent propositional logic term. Then we use propositional logic terms to de?ne a fuzzy set based decision model. This optimization model incorporates uncertainty with regard to the impact of investments on the achieved security levels of components of the distributed system. The model also accounts for budget and security constraints, in order to be applicable in practice."}],"date_created":"2018-11-14T14:35:59Z","file":[{"date_created":"2018-12-11T15:22:12Z","creator":"hsiemes","file_id":"6190","content_type":"application/pdf","file_name":"security_fuzzy_LNI Version.pdf","access_level":"open_access","file_size":372660,"relation":"main_file","date_updated":"2018-12-13T15:20:03Z"}],"department":[{"_id":"277"}],"type":"conference","author":[{"first_name":"Guido","last_name":"Schryen","full_name":"Schryen, Guido","id":"72850"}],"year":"2010","title":"A Fuzzy Model for IT Security Investments","intvolume":"       170","date_updated":"2022-01-06T07:02:18Z","language":[{"iso":"eng"}],"series_title":"GI-Edition: lecture notes in informatics. Proceedings"},{"_id":"5643","ddc":["000"],"user_id":"61579","status":"public","has_accepted_license":"1","oa":"1","citation":{"mla":"Schryen, Guido. “An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness.” <i>Proceedings of the First Scandinavian Conference on Information Systems (SCIS)</i>, 2010.","bibtex":"@inproceedings{Schryen_2010, title={An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness}, booktitle={Proceedings of the First Scandinavian Conference on Information Systems (SCIS)}, author={Schryen, Guido}, year={2010} }","ama":"Schryen G. An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness. In: <i>Proceedings of the First Scandinavian Conference on Information Systems (SCIS)</i>. ; 2010.","ieee":"G. Schryen, “An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness,” in <i>Proceedings of the First Scandinavian Conference on Information Systems (SCIS)</i>, 2010.","apa":"Schryen, G. (2010). An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness. In <i>Proceedings of the First Scandinavian Conference on Information Systems (SCIS)</i>.","chicago":"Schryen, Guido. “An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness.” In <i>Proceedings of the First Scandinavian Conference on Information Systems (SCIS)</i>, 2010.","short":"G. Schryen, in: Proceedings of the First Scandinavian Conference on Information Systems (SCIS), 2010."},"file_date_updated":"2018-12-13T15:17:00Z","language":[{"iso":"eng"}],"author":[{"id":"72850","first_name":"Guido","last_name":"Schryen","full_name":"Schryen, Guido"}],"title":"An Analysis of Literature Reviews on IS Business Value: How Deficiencies in Methodology and Theory Use Resulted in Limited Effectiveness","year":"2010","date_updated":"2022-01-06T07:02:18Z","date_created":"2018-11-14T14:36:26Z","file":[{"file_id":"6186","content_type":"application/pdf","file_name":"2010_Book_ScandinavianInformationSystems - Schryen.pdf","access_level":"open_access","file_size":302340,"relation":"main_file","date_updated":"2018-12-13T15:17:00Z","date_created":"2018-12-11T15:14:51Z","creator":"hsiemes"}],"department":[{"_id":"277"}],"type":"conference","keyword":["Literature review","Business value","Information systems","Methodology","Theory"],"publication":"Proceedings of the First Scandinavian Conference on Information Systems (SCIS)","abstract":[{"text":"Enduring doubts about the value of IS investments reveal that IS researchers have not fully managed to identify and to explain the economic benefits of IS. This paper assumes that literature reviews, which represent a powerful instrument for the identification and synthesis of knowledge, have not tapped their full potential to address this issue due to deficiencies in methodology. The analysis of 18 literature reviews published in pertinent academic outlets during the past 20 years shows such deficiencies. Two of the most critical weaknesses identified are (1) the lack of theory use in most reviews and (2) a weak linkage of reviews, resulting in little progress in theory and framework development. The systematic identification of these weaknesses and the extraction of promising methodological examples from past literature are the main contributions of this work, which supports the composition of more effective literature reviews in future research.","lang":"eng"}],"extern":"1"},{"user_id":"61579","ddc":["000"],"volume":52,"page":"225-237","_id":"5644","publisher":"Springer","has_accepted_license":"1","status":"public","oa":"1","file_date_updated":"2018-12-13T15:17:12Z","citation":{"mla":"Schryen, Guido. “Preserving Knowledge on IS Business Value: What Literature Reviews Have Done.” <i>Business \\&#38; Information Systems Engineering (BISE)</i>, vol. 52, no. 4, Springer, 2010, pp. 225–37.","ama":"Schryen G. Preserving knowledge on IS business value: what literature reviews have done. <i>Business \\&#38; Information Systems Engineering (BISE)</i>. 2010;52(4):225-237.","bibtex":"@article{Schryen_2010, title={Preserving knowledge on IS business value: what literature reviews have done}, volume={52}, number={4}, journal={Business \\&#38; Information Systems Engineering (BISE)}, publisher={Springer}, author={Schryen, Guido}, year={2010}, pages={225–237} }","apa":"Schryen, G. (2010). Preserving knowledge on IS business value: what literature reviews have done. <i>Business \\&#38; Information Systems Engineering (BISE)</i>, <i>52</i>(4), 225–237.","ieee":"G. Schryen, “Preserving knowledge on IS business value: what literature reviews have done,” <i>Business \\&#38; Information Systems Engineering (BISE)</i>, vol. 52, no. 4, pp. 225–237, 2010.","chicago":"Schryen, Guido. “Preserving Knowledge on IS Business Value: What Literature Reviews Have Done.” <i>Business \\&#38; Information Systems Engineering (BISE)</i> 52, no. 4 (2010): 225–37.","short":"G. Schryen, Business \\&#38; Information Systems Engineering (BISE) 52 (2010) 225–237."},"language":[{"iso":"eng"}],"date_updated":"2022-01-06T07:02:19Z","intvolume":"        52","year":"2010","title":"Preserving knowledge on IS business value: what literature reviews have done","author":[{"id":"72850","full_name":"Schryen, Guido","first_name":"Guido","last_name":"Schryen"}],"type":"journal_article","keyword":["Business value","Information systems","Literature review","Meta review"],"department":[{"_id":"277"}],"file":[{"creator":"hsiemes","date_created":"2018-12-11T15:19:37Z","relation":"main_file","date_updated":"2018-12-13T15:17:12Z","file_name":"BISE-PreservingknowledgeonISbusinessvalue-Manuscript-1.pdf","file_size":525443,"access_level":"open_access","file_id":"6187","content_type":"application/pdf"}],"date_created":"2018-11-14T14:38:02Z","extern":"1","abstract":[{"lang":"eng","text":"The economic relevance of information systems has been studied for many years and has attracted an abundance of research papers. However, the ?productivity paradoxon? of the 90s, Carr?s widely recognized paper ?IT doesn?t matter?, and several studies that do not find a positive correlation between IS investments and economic performance reveal long-lasting difficulties for IS researchers to explain ?IS business value?. Business executives and researchers also continue to question the value of IS investments. This raises the question of whether literature reviews have tapped their potential to address the concerns by covering key research areas of IS business value and preserving their key findings. In order to address this question, this paper identifies and describes 12 key research areas, and synthesizes what literature reviews published in pertinent academic outlets have done to preserve knowledge. The analysis of 22 literature reviews shows that some crucial areas have not been (sufficiently) covered. They provide fertile areas for future literature reviews. As this work is based on the results of more than 200 research papers, it is capable of drawing a comprehensive picture of the current state-of-the-art in IS business value research."}],"issue":"4","publication":"Business \\& Information Systems Engineering (BISE)"},{"file_date_updated":"2018-12-13T15:19:50Z","citation":{"bibtex":"@article{Schryen_2010, title={Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done)}, volume={52}, number={4}, journal={Wirtschaftsinformatik}, publisher={Gabler; Springer}, author={Schryen, Guido}, year={2010}, pages={225–237} }","ama":"Schryen G. Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done). <i>Wirtschaftsinformatik</i>. 2010;52(4):225-237.","mla":"Schryen, Guido. “Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews Zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done).” <i>Wirtschaftsinformatik</i>, vol. 52, no. 4, Gabler; Springer, 2010, pp. 225–37.","short":"G. Schryen, Wirtschaftsinformatik 52 (2010) 225–237.","chicago":"Schryen, Guido. “Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews Zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done).” <i>Wirtschaftsinformatik</i> 52, no. 4 (2010): 225–37.","ieee":"G. Schryen, “Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done),” <i>Wirtschaftsinformatik</i>, vol. 52, no. 4, pp. 225–237, 2010.","apa":"Schryen, G. (2010). Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done). <i>Wirtschaftsinformatik</i>, <i>52</i>(4), 225–237."},"oa":"1","status":"public","has_accepted_license":"1","page":"225-237","_id":"5645","publisher":"Gabler; Springer","user_id":"61579","ddc":["000"],"volume":52,"publication":"Wirtschaftsinformatik","issue":"4","extern":"1","abstract":[{"lang":"eng","text":"The economic relevance of information systems has been studied for many years and has attracted an abundance of research papers. However, the ?productivity paradoxon? of the 1990s, Carr?s widely recognized paper ?IT doesn?t matter?, and several studies that do not find a positive correlation between IS investments and economic performance reveal long-lasting difficulties for IS researchers to explain ?IS business value?. Business executives and researchers also continue to question the value of IS investments. This raises the question of whether literature reviews have tapped their potential to address the concerns by covering key research areas of IS business value and preserving their key findings. In order to address this question, this paper identifies and describes 12 key research areas, and synthesizes what literature reviews published in pertinent academic outlets have done to preserve knowledge. The analysis of 22 literature reviews shows that some crucial areas have not been (sufficiently) covered. They provide fertile areas for future literature reviews. As this work is based on the results of more than 200 research papers, it is capable of drawing a comprehensive picture of the current state-of-the-art in IS business value research."}],"file":[{"content_type":"application/pdf","file_id":"6189","date_updated":"2018-12-13T15:19:50Z","relation":"main_file","file_size":850718,"access_level":"open_access","file_name":"Schryen2010_Article_ÖkonomischerWertVonInformation.pdf","date_created":"2018-12-11T15:21:36Z","creator":"hsiemes"}],"date_created":"2018-11-14T14:38:45Z","type":"journal_article","department":[{"_id":"277"}],"title":"Ökonomischer Wert von Informationssystemen - Beitrag von Literatur-Reviews zum Wissenserhalt ( = Preserving Knowledge on IS Business Value. What Literature Reviews Have Done)","year":"2010","author":[{"id":"72850","full_name":"Schryen, Guido","first_name":"Guido","last_name":"Schryen"}],"date_updated":"2022-01-06T07:02:19Z","intvolume":"        52","language":[{"iso":"eng"}]},{"doi":"10.1109/WPNC.2010.5650745","user_id":"44006","page":"128-134","main_file_link":[{"open_access":"1","url":"https://groups.uni-paderborn.de/nt/pubs/2010/BeWaPeHa10.pdf"}],"_id":"11726","language":[{"iso":"eng"}],"date_updated":"2022-01-06T06:51:07Z","year":"2010","status":"public","title":"Barometric height estimation combined with map-matching in a loosely-coupled Kalman-filter","author":[{"full_name":"Bevermeier, Maik","first_name":"Maik","last_name":"Bevermeier"},{"first_name":"Oliver","last_name":"Walter","full_name":"Walter, Oliver"},{"full_name":"Peschke, Sven","last_name":"Peschke","first_name":"Sven"},{"id":"242","first_name":"Reinhold","last_name":"Haeb-Umbach","full_name":"Haeb-Umbach, Reinhold"}],"keyword":["altitude measurement unit","barometers","barometric altimeter","barometric error Kalman filter","barometric height estimation","direct cosine matrix","global positioning system","Global Positioning System","GPS device","height information","height measurement","inertial measurement unit","Kalman filters","loosely-coupled error state space Kalman filter","loosely-coupled Kalman-filter","map matching","robust information","robust location estimation","sensor fusion","topographic map information","vertical user position"],"type":"conference","oa":"1","department":[{"_id":"54"}],"date_created":"2019-07-12T05:27:04Z","abstract":[{"text":"In this paper we present a robust location estimation algorithm especially focused on the accuracy in vertical position. A loosely-coupled error state space Kalman filter, which fuses sensor data of an Inertial Measurement Unit and the output of a Global Positioning System device, is augmented by height information from an altitude measurement unit. This unit consists of a barometric altimeter whose output is fused with topographic map information by a Kalman filter to provide robust information about the current vertical user position. These data replace the less reliable vertical position information provided the GPS device. It is shown that typical barometric errors like thermal divergences and fluctuations in the pressure due to changing weather conditions can be compensated by the topographic map information and the barometric error Kalman filter. The resulting height information is shown not only to be more reliable than height information provided by GPS. It also turns out that it leads to better attitude and thus better overall localization estimation accuracy due to the coupling of spatial orientations via the Direct Cosine Matrix. Results are presented both for artificially generated and field test data, where the user is moving by car.","lang":"eng"}],"publication":"7th Workshop on Positioning Navigation and Communication (WPNC 2010)","citation":{"chicago":"Bevermeier, Maik, Oliver Walter, Sven Peschke, and Reinhold Haeb-Umbach. “Barometric Height Estimation Combined with Map-Matching in a Loosely-Coupled Kalman-Filter.” In <i>7th Workshop on Positioning Navigation and Communication (WPNC 2010)</i>, 128–34, 2010. <a href=\"https://doi.org/10.1109/WPNC.2010.5650745\">https://doi.org/10.1109/WPNC.2010.5650745</a>.","short":"M. Bevermeier, O. Walter, S. Peschke, R. Haeb-Umbach, in: 7th Workshop on Positioning Navigation and Communication (WPNC 2010), 2010, pp. 128–134.","apa":"Bevermeier, M., Walter, O., Peschke, S., &#38; Haeb-Umbach, R. (2010). Barometric height estimation combined with map-matching in a loosely-coupled Kalman-filter. In <i>7th Workshop on Positioning Navigation and Communication (WPNC 2010)</i> (pp. 128–134). <a href=\"https://doi.org/10.1109/WPNC.2010.5650745\">https://doi.org/10.1109/WPNC.2010.5650745</a>","ieee":"M. Bevermeier, O. Walter, S. Peschke, and R. Haeb-Umbach, “Barometric height estimation combined with map-matching in a loosely-coupled Kalman-filter,” in <i>7th Workshop on Positioning Navigation and Communication (WPNC 2010)</i>, 2010, pp. 128–134.","ama":"Bevermeier M, Walter O, Peschke S, Haeb-Umbach R. Barometric height estimation combined with map-matching in a loosely-coupled Kalman-filter. In: <i>7th Workshop on Positioning Navigation and Communication (WPNC 2010)</i>. ; 2010:128-134. doi:<a href=\"https://doi.org/10.1109/WPNC.2010.5650745\">10.1109/WPNC.2010.5650745</a>","bibtex":"@inproceedings{Bevermeier_Walter_Peschke_Haeb-Umbach_2010, title={Barometric height estimation combined with map-matching in a loosely-coupled Kalman-filter}, DOI={<a href=\"https://doi.org/10.1109/WPNC.2010.5650745\">10.1109/WPNC.2010.5650745</a>}, booktitle={7th Workshop on Positioning Navigation and Communication (WPNC 2010)}, author={Bevermeier, Maik and Walter, Oliver and Peschke, Sven and Haeb-Umbach, Reinhold}, year={2010}, pages={128–134} }","mla":"Bevermeier, Maik, et al. “Barometric Height Estimation Combined with Map-Matching in a Loosely-Coupled Kalman-Filter.” <i>7th Workshop on Positioning Navigation and Communication (WPNC 2010)</i>, 2010, pp. 128–34, doi:<a href=\"https://doi.org/10.1109/WPNC.2010.5650745\">10.1109/WPNC.2010.5650745</a>."}},{"status":"public","page":"1692-1707","_id":"11846","user_id":"44006","volume":18,"citation":{"mla":"Krueger, Alexander, and Reinhold Haeb-Umbach. “Model-Based Feature Enhancement for Reverberant Speech Recognition.” <i>IEEE Transactions on Audio, Speech, and Language Processing</i>, vol. 18, no. 7, 2010, pp. 1692–707, doi:<a href=\"https://doi.org/10.1109/TASL.2010.2049684\">10.1109/TASL.2010.2049684</a>.","ama":"Krueger A, Haeb-Umbach R. Model-Based Feature Enhancement for Reverberant Speech Recognition. <i>IEEE Transactions on Audio, Speech, and Language Processing</i>. 2010;18(7):1692-1707. doi:<a href=\"https://doi.org/10.1109/TASL.2010.2049684\">10.1109/TASL.2010.2049684</a>","bibtex":"@article{Krueger_Haeb-Umbach_2010, title={Model-Based Feature Enhancement for Reverberant Speech Recognition}, volume={18}, DOI={<a href=\"https://doi.org/10.1109/TASL.2010.2049684\">10.1109/TASL.2010.2049684</a>}, number={7}, journal={IEEE Transactions on Audio, Speech, and Language Processing}, author={Krueger, Alexander and Haeb-Umbach, Reinhold}, year={2010}, pages={1692–1707} }","apa":"Krueger, A., &#38; Haeb-Umbach, R. (2010). Model-Based Feature Enhancement for Reverberant Speech Recognition. <i>IEEE Transactions on Audio, Speech, and Language Processing</i>, <i>18</i>(7), 1692–1707. <a href=\"https://doi.org/10.1109/TASL.2010.2049684\">https://doi.org/10.1109/TASL.2010.2049684</a>","ieee":"A. Krueger and R. Haeb-Umbach, “Model-Based Feature Enhancement for Reverberant Speech Recognition,” <i>IEEE Transactions on Audio, Speech, and Language Processing</i>, vol. 18, no. 7, pp. 1692–1707, 2010.","short":"A. Krueger, R. Haeb-Umbach, IEEE Transactions on Audio, Speech, and Language Processing 18 (2010) 1692–1707.","chicago":"Krueger, Alexander, and Reinhold Haeb-Umbach. “Model-Based Feature Enhancement for Reverberant Speech Recognition.” <i>IEEE Transactions on Audio, Speech, and Language Processing</i> 18, no. 7 (2010): 1692–1707. <a href=\"https://doi.org/10.1109/TASL.2010.2049684\">https://doi.org/10.1109/TASL.2010.2049684</a>."},"oa":"1","title":"Model-Based Feature Enhancement for Reverberant Speech Recognition","year":"2010","author":[{"full_name":"Krueger, Alexander","first_name":"Alexander","last_name":"Krueger"},{"last_name":"Haeb-Umbach","first_name":"Reinhold","full_name":"Haeb-Umbach, Reinhold","id":"242"}],"date_updated":"2022-01-06T06:51:11Z","intvolume":"        18","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2010/KrHa10.pdf","open_access":"1"}],"language":[{"iso":"eng"}],"doi":"10.1109/TASL.2010.2049684","issue":"7","publication":"IEEE Transactions on Audio, Speech, and Language Processing","abstract":[{"lang":"eng","text":"In this paper, we present a new technique for automatic speech recognition (ASR) in reverberant environments. Our approach is aimed at the enhancement of the logarithmic Mel power spectrum, which is computed at an intermediate stage to obtain the widely used Mel frequency cepstral coefficients (MFCCs). Given the reverberant logarithmic Mel power spectral coefficients (LMPSCs), a minimum mean square error estimate of the clean LMPSCs is computed by carrying out Bayesian inference. We employ switching linear dynamical models as an a priori model for the dynamics of the clean LMPSCs. Further, we derive a stochastic observation model which relates the clean to the reverberant LMPSCs through a simplified model of the room impulse response (RIR). This model requires only two parameters, namely RIR energy and reverberation time, which can be estimated from the captured microphone signal. The performance of the proposed enhancement technique is studied on the AURORA5 database and compared to that of constrained maximum-likelihood linear regression (CMLLR). It is shown by experimental results that our approach significantly outperforms CMLLR and that up to 80\\% of the errors caused by the reverberation are recovered. In addition to the fact that the approach is compatible with the standard MFCC feature vectors, it leaves the ASR back-end unchanged. It is of moderate computational complexity and suitable for real time applications."}],"date_created":"2019-07-12T05:29:23Z","keyword":["ASR","AURORA5 database","automatic speech recognition","Bayesian inference","belief networks","CMLLR","computational complexity","constrained maximum likelihood linear regression","least mean squares methods","LMPSC computation","logarithmic Mel power spectrum","maximum likelihood estimation","Mel frequency cepstral coefficients","MFCC feature vectors","microphone signal","minimum mean square error estimation","model-based feature enhancement","regression analysis","reverberant speech recognition","reverberation","RIR energy","room impulse response","speech recognition","stochastic observation model","stochastic processes"],"type":"journal_article","department":[{"_id":"54"}]},{"type":"conference","department":[{"_id":"54"}],"oa":"1","date_created":"2019-07-12T05:29:36Z","abstract":[{"lang":"eng","text":"Traditionally, ASR systems are based on hidden Markov models with Gaussian mixtures modelling the state-conditioned feature distribution. The inherent assumption of conditional independence, stating that a feature's likelihood solely depends on the current HMM state, makes the search computationally tractable, nevertheless has also been identified to be a major reason for the lack of robustness of such systems. Linear dynamic models have been proposed to overcome this weakness by employing a hidden dynamic state process underlying the observed features. Though performance of linear dynamic models on continuous speech/phone recognition tasks has been shown to be superior to that of equivalent static models, this approach still cannot compete with the established acoustic models. In this paper we consider the combination of hidden Markov models based on Gaussian mixture densities (GMM-HMMs) and linear dynamic models (LDMs) as the acoustic model for automatic speech recognition systems. In doing so, the individual strengths of both models, i.e. the modelling of long-term temporal dependencies by the GMM-HMM and the direct modelling of statistical dependencies between consecutive feature vectors by the LDM, are exploited. Phone classification experiments conducted on the TIMIT database indicate the prospective use of this approach for the application to continuous speech recognition."}],"publication":"36. Deutsche Jahrestagung fuer Akustik (DAGA 2010)","citation":{"chicago":"Leutnant, Volker, and Reinhold Haeb-Umbach. “Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR.” In <i>36. Deutsche Jahrestagung Fuer Akustik (DAGA 2010)</i>, 2010.","short":"V. Leutnant, R. Haeb-Umbach, in: 36. Deutsche Jahrestagung Fuer Akustik (DAGA 2010), 2010.","ieee":"V. Leutnant and R. Haeb-Umbach, “Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR,” in <i>36. Deutsche Jahrestagung fuer Akustik (DAGA 2010)</i>, 2010.","apa":"Leutnant, V., &#38; Haeb-Umbach, R. (2010). Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR. In <i>36. Deutsche Jahrestagung fuer Akustik (DAGA 2010)</i>.","bibtex":"@inproceedings{Leutnant_Haeb-Umbach_2010, title={Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR}, booktitle={36. Deutsche Jahrestagung fuer Akustik (DAGA 2010)}, author={Leutnant, Volker and Haeb-Umbach, Reinhold}, year={2010} }","ama":"Leutnant V, Haeb-Umbach R. Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR. In: <i>36. Deutsche Jahrestagung Fuer Akustik (DAGA 2010)</i>. ; 2010.","mla":"Leutnant, Volker, and Reinhold Haeb-Umbach. “Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR.” <i>36. Deutsche Jahrestagung Fuer Akustik (DAGA 2010)</i>, 2010."},"user_id":"44006","main_file_link":[{"open_access":"1","url":"https://groups.uni-paderborn.de/nt/pubs/2010/LeHa10-1.pdf"}],"language":[{"iso":"eng"}],"_id":"11857","date_updated":"2022-01-06T06:51:11Z","title":"Options for Modelling Temporal Statistical Dependencies in an Acoustic Model for ASR","year":"2010","status":"public","author":[{"last_name":"Leutnant","first_name":"Volker","full_name":"Leutnant, Volker"},{"full_name":"Haeb-Umbach, Reinhold","first_name":"Reinhold","last_name":"Haeb-Umbach","id":"242"}]},{"date_created":"2019-07-12T05:29:37Z","department":[{"_id":"54"}],"oa":"1","type":"conference","citation":{"bibtex":"@inproceedings{Leutnant_Haeb-Umbach_2010, title={On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition}, booktitle={Interspeech 2010}, author={Leutnant, Volker and Haeb-Umbach, Reinhold}, year={2010} }","ama":"Leutnant V, Haeb-Umbach R. On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition. In: <i>Interspeech 2010</i>. ; 2010.","mla":"Leutnant, Volker, and Reinhold Haeb-Umbach. “On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition.” <i>Interspeech 2010</i>, 2010.","short":"V. Leutnant, R. Haeb-Umbach, in: Interspeech 2010, 2010.","chicago":"Leutnant, Volker, and Reinhold Haeb-Umbach. “On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition.” In <i>Interspeech 2010</i>, 2010.","ieee":"V. Leutnant and R. Haeb-Umbach, “On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition,” in <i>Interspeech 2010</i>, 2010.","apa":"Leutnant, V., &#38; Haeb-Umbach, R. (2010). On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition. In <i>Interspeech 2010</i>."},"publication":"Interspeech 2010","abstract":[{"text":"Linear dynamic models (LDMs) have been shown to be a viable alternative to hidden Markov models (HMMs) on small-vocabulary recognition tasks, such as phone classification. In this paper we investigate various statistical model combination approaches for a hybrid HMM-LDM recognizer, resulting in a phone classification performance that outperforms the best individual classifier. Further, we report on continuous speech recognition experiments on the AURORA4 corpus, where the model combination is carried out on wordgraph rescoring. While the hybrid system improves the HMM system in the case of monophone HMMs, the performance of the triphone HMM model could not be improved by monophone LDMs, asking for the need to introduce context-dependency also in the LDM model inventory.","lang":"eng"}],"language":[{"iso":"eng"}],"_id":"11858","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2010/LeHa10-2.pdf","open_access":"1"}],"user_id":"44006","author":[{"full_name":"Leutnant, Volker","first_name":"Volker","last_name":"Leutnant"},{"id":"242","last_name":"Haeb-Umbach","first_name":"Reinhold","full_name":"Haeb-Umbach, Reinhold"}],"title":"On the Exploitation of Hidden Markov Models and Linear Dynamic Models in a Hybrid Decoder Architecture for Continuous Speech Recognition","status":"public","year":"2010","date_updated":"2022-01-06T06:51:11Z"},{"type":"conference","oa":"1","department":[{"_id":"54"}],"date_created":"2019-07-12T05:30:10Z","abstract":[{"text":"We describe an algorithm that performs regularized non-negative matrix factorization (NMF) to find independent components in non-negative data. Previous techniques proposed for this purpose require the data to be grounded, with support that goes down to 0 along each dimension. In our work, this requirement is eliminated. Based on it, we present a technique to find a low-dimensional decomposition of spectrograms by casting it as a problem of discovering independent non-negative components from it. The algorithm itself is implemented as regularized non-negative matrix factorization (NMF). Unlike other ICA algorithms, this algorithm computes the mixing matrix rather than an unmixing matrix. This algorithm provides a better decomposition than standard NMF when the underlying sources are independent. It makes better use of additional observation streams than previous non-negative ICA algorithms.","lang":"eng"}],"publication":"Interspeech 2010","citation":{"mla":"Raj, Bhiksha, et al. “Ungrounded Independent Non-Negative Factor Analysis.” <i>Interspeech 2010</i>, 2010.","ama":"Raj B, Wilson KW, Krueger A, Haeb-Umbach R. Ungrounded Independent Non-Negative Factor Analysis. In: <i>Interspeech 2010</i>. ; 2010.","bibtex":"@inproceedings{Raj_Wilson_Krueger_Haeb-Umbach_2010, title={Ungrounded Independent Non-Negative Factor Analysis}, booktitle={Interspeech 2010}, author={Raj, Bhiksha and Wilson, Kevin W. and Krueger, Alexander and Haeb-Umbach, Reinhold}, year={2010} }","apa":"Raj, B., Wilson, K. W., Krueger, A., &#38; Haeb-Umbach, R. (2010). Ungrounded Independent Non-Negative Factor Analysis. In <i>Interspeech 2010</i>.","ieee":"B. Raj, K. W. Wilson, A. Krueger, and R. Haeb-Umbach, “Ungrounded Independent Non-Negative Factor Analysis,” in <i>Interspeech 2010</i>, 2010.","short":"B. Raj, K.W. Wilson, A. Krueger, R. Haeb-Umbach, in: Interspeech 2010, 2010.","chicago":"Raj, Bhiksha, Kevin W. Wilson, Alexander Krueger, and Reinhold Haeb-Umbach. “Ungrounded Independent Non-Negative Factor Analysis.” In <i>Interspeech 2010</i>, 2010."},"user_id":"44006","main_file_link":[{"open_access":"1","url":"https://groups.uni-paderborn.de/nt/pubs/2010/RaWiKrHa10.pdf"}],"language":[{"iso":"eng"}],"_id":"11887","date_updated":"2022-01-06T06:51:11Z","status":"public","year":"2010","title":"Ungrounded Independent Non-Negative Factor Analysis","author":[{"full_name":"Raj, Bhiksha","first_name":"Bhiksha","last_name":"Raj"},{"full_name":"Wilson, Kevin W.","first_name":"Kevin W.","last_name":"Wilson"},{"full_name":"Krueger, Alexander","first_name":"Alexander","last_name":"Krueger"},{"id":"242","full_name":"Haeb-Umbach, Reinhold","first_name":"Reinhold","last_name":"Haeb-Umbach"}]},{"oa":"1","department":[{"_id":"54"}],"type":"conference","date_created":"2019-07-12T05:30:39Z","abstract":[{"lang":"eng","text":"In this contribution we provide a unified treatment of blind source separation (BSS) and noise suppression, two tasks which have traditionally been considered different and for which quite different techniques have been developed. Exploiting the sparseness of the sources in the short time frequency domain and using a probabilistic model which accounts for the presence of additive noise and which captures the spatial information of the multi-channel recording, a speech enhancement system is developed which suppresses noise and simultaneously separates speakers in case multiple speakers are active. Source activity estimation and model parameter estimation form the E-step and the M-step of the Expectation Maximization algorithm, respectively. Experimental results obtained on the dataset of the Signal Separation Evaluation Campaign 2010 demonstrate the effectiveness of the proposed system."}],"citation":{"ieee":"D. H. Tran Vu and R. Haeb-Umbach, “An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression,” in <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)</i>, 2010.","apa":"Tran Vu, D. H., &#38; Haeb-Umbach, R. (2010). An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression. In <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)</i>.","short":"D.H. Tran Vu, R. Haeb-Umbach, in: International Workshop on Acoustic Echo and Noise Control (IWAENC 2010), 2010.","chicago":"Tran Vu, Dang Hai, and Reinhold Haeb-Umbach. “An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression.” In <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)</i>, 2010.","mla":"Tran Vu, Dang Hai, and Reinhold Haeb-Umbach. “An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression.” <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)</i>, 2010.","bibtex":"@inproceedings{Tran Vu_Haeb-Umbach_2010, title={An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression}, booktitle={International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)}, author={Tran Vu, Dang Hai and Haeb-Umbach, Reinhold}, year={2010} }","ama":"Tran Vu DH, Haeb-Umbach R. An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression. In: <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)</i>. ; 2010."},"publication":"International Workshop on Acoustic Echo and Noise Control (IWAENC 2010)","user_id":"44006","language":[{"iso":"eng"}],"_id":"11912","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2010/DaHa10-1.pdf","open_access":"1"}],"date_updated":"2022-01-06T06:51:12Z","author":[{"full_name":"Tran Vu, Dang Hai","first_name":"Dang Hai","last_name":"Tran Vu"},{"id":"242","first_name":"Reinhold","last_name":"Haeb-Umbach","full_name":"Haeb-Umbach, Reinhold"}],"title":"An EM Approach to Integrated Multichannel Speech Separation and Noise Suppression","year":"2010","status":"public"},{"author":[{"first_name":"Dang Hai","last_name":"Tran Vu","full_name":"Tran Vu, Dang Hai"},{"full_name":"Haeb-Umbach, Reinhold","last_name":"Haeb-Umbach","first_name":"Reinhold","id":"242"}],"year":"2010","title":"Blind speech separation employing directional statistics in an Expectation Maximization framework","status":"public","date_updated":"2022-01-06T06:51:12Z","language":[{"iso":"eng"}],"_id":"11913","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2010/DaHa10-2.pdf","open_access":"1"}],"page":"241-244","user_id":"44006","doi":"10.1109/ICASSP.2010.5495994","citation":{"mla":"Tran Vu, Dang Hai, and Reinhold Haeb-Umbach. “Blind Speech Separation Employing Directional Statistics in an Expectation Maximization Framework.” <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)</i>, 2010, pp. 241–44, doi:<a href=\"https://doi.org/10.1109/ICASSP.2010.5495994\">10.1109/ICASSP.2010.5495994</a>.","ama":"Tran Vu DH, Haeb-Umbach R. Blind speech separation employing directional statistics in an Expectation Maximization framework. In: <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)</i>. ; 2010:241-244. doi:<a href=\"https://doi.org/10.1109/ICASSP.2010.5495994\">10.1109/ICASSP.2010.5495994</a>","bibtex":"@inproceedings{Tran Vu_Haeb-Umbach_2010, title={Blind speech separation employing directional statistics in an Expectation Maximization framework}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2010.5495994\">10.1109/ICASSP.2010.5495994</a>}, booktitle={IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)}, author={Tran Vu, Dang Hai and Haeb-Umbach, Reinhold}, year={2010}, pages={241–244} }","apa":"Tran Vu, D. H., &#38; Haeb-Umbach, R. (2010). Blind speech separation employing directional statistics in an Expectation Maximization framework. In <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)</i> (pp. 241–244). <a href=\"https://doi.org/10.1109/ICASSP.2010.5495994\">https://doi.org/10.1109/ICASSP.2010.5495994</a>","ieee":"D. H. Tran Vu and R. Haeb-Umbach, “Blind speech separation employing directional statistics in an Expectation Maximization framework,” in <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)</i>, 2010, pp. 241–244.","short":"D.H. Tran Vu, R. Haeb-Umbach, in: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010), 2010, pp. 241–244.","chicago":"Tran Vu, Dang Hai, and Reinhold Haeb-Umbach. “Blind Speech Separation Employing Directional Statistics in an Expectation Maximization Framework.” In <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)</i>, 241–44, 2010. <a href=\"https://doi.org/10.1109/ICASSP.2010.5495994\">https://doi.org/10.1109/ICASSP.2010.5495994</a>."},"publication":"IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010)","abstract":[{"lang":"eng","text":"In this paper we propose to employ directional statistics in a complex vector space to approach the problem of blind speech separation in the presence of spatially correlated noise. We interpret the values of the short time Fourier transform of the microphone signals to be draws from a mixture of complex Watson distributions, a probabilistic model which naturally accounts for spatial aliasing. The parameters of the density are related to the a priori source probabilities, the power of the sources and the transfer function ratios from sources to sensors. Estimation formulas are derived for these parameters by employing the Expectation Maximization (EM) algorithm. The E-step corresponds to the estimation of the source presence probabilities for each time-frequency bin, while the M-step leads to a maximum signal-to-noise ratio (MaxSNR) beamformer in the presence of uncertainty about the source activity. Experimental results are reported for an implementation in a generalized sidelobe canceller (GSC) like spatial beamforming configuration for 3 speech sources with significant coherent noise in reverberant environments, demonstrating the usefulness of the novel modeling framework."}],"date_created":"2019-07-12T05:30:40Z","department":[{"_id":"54"}],"oa":"1","keyword":["array signal processing","blind source separation","blind speech separation","complex vector space","complex Watson distribution","directional statistics","expectation-maximisation algorithm","expectation maximization algorithm","Fourier transform","Fourier transforms","generalized sidelobe canceller","interference suppression","maximum signal-to-noise ratio beamformer","microphone signal","probabilistic model","spatial aliasing","spatial beamforming configuration","speech enhancement","statistical distributions"],"type":"conference"}]