[{"status":"public","page":"343-360","_id":"8179","user_id":"71541","volume":10,"citation":{"ieee":"S. Gharibian, “Strong NP-hardness of the quantum separability problem,” <i>Quantum Information &#38; Computation</i>, vol. 10, no. 3{\\ &#38; }4, pp. 343–360, 2010.","mla":"Gharibian, Sevag. “Strong NP-Hardness of the Quantum Separability Problem.” <i>Quantum Information &#38; Computation</i>, vol. 10, no. 3{\\ &#38; }4, 2010, pp. 343–60.","apa":"Gharibian, S. (2010). Strong NP-hardness of the quantum separability problem. <i>Quantum Information &#38; Computation</i>, <i>10</i>(3{\\ &#38; }4), 343–360.","bibtex":"@article{Gharibian_2010, title={Strong NP-hardness of the quantum separability problem}, volume={10}, number={3{\\ &#38; }4}, journal={Quantum Information &#38; Computation}, author={Gharibian, Sevag}, year={2010}, pages={343–360} }","chicago":"Gharibian, Sevag. “Strong NP-Hardness of the Quantum Separability Problem.” <i>Quantum Information &#38; Computation</i> 10, no. 3{\\ &#38; }4 (2010): 343–60.","short":"S. Gharibian, Quantum Information &#38; Computation 10 (2010) 343–360.","ama":"Gharibian S. Strong NP-hardness of the quantum separability problem. <i>Quantum Information &#38; Computation</i>. 2010;10(3{\\ &#38; }4):343-360."},"external_id":{"arxiv":["0810.4507"]},"oa":"1","year":"2010","title":"Strong NP-hardness of the quantum separability problem","author":[{"id":"71541","full_name":"Gharibian, Sevag","first_name":"Sevag","last_name":"Gharibian","orcid":"0000-0002-9992-3379"}],"publication_status":"published","date_updated":"2023-02-28T11:04:38Z","article_type":"original","intvolume":"        10","main_file_link":[{"url":"https://arxiv.org/abs/0810.4507","open_access":"1"}],"language":[{"iso":"eng"}],"issue":"3{\\&}4","publication":"Quantum Information & Computation","extern":"1","abstract":[{"text":"Given the density matrix rho of a bipartite quantum state, the quantum separability problem asks whether rho is entangled or separable. In 2003, Gurvits showed that this problem is NP-hard if rho is located within an inverse exponential (with respect to dimension) distance from the border of the set of separable quantum states. In this paper, we extend this NP-hardness to an inverse polynomial distance from the separable set. The result follows from a simple combination of works by Gurvits, Ioannou, and Liu. We apply our result to show (1) an immediate lower bound on the maximum distance between a bound entangled state and the separable set (assuming P != NP), and (2) NP-hardness for the problem of determining whether a completely positive trace-preserving linear map is entanglement-breaking.","lang":"eng"}],"date_created":"2019-03-01T12:09:59Z","type":"journal_article","department":[{"_id":"623"},{"_id":"7"}]},{"author":[{"id":"21863","full_name":"Fuchs, Christian","orcid":"0000-0003-0589-4579","first_name":"Christian","last_name":"Fuchs"},{"first_name":"Matthias","last_name":"Schafranek","full_name":"Schafranek, Matthias"},{"first_name":"David","last_name":"Hakken","full_name":"Hakken, David"},{"full_name":"Breen, Marcus","first_name":"Marcus","last_name":"Breen"}],"year":"2010","status":"public","title":"Co-editor of the special issue “Capitalist crisis, communication & culture“","intvolume":"         8","date_updated":"2023-03-08T03:18:05Z","language":[{"iso":"eng"}],"_id":"41660","page":"193-309","main_file_link":[{"url":"https://www.triple-c.at/index.php/tripleC/issue/view/20","open_access":"1"}],"volume":8,"user_id":"49063","citation":{"bibtex":"@article{Fuchs_Schafranek_Hakken_Breen_2010, title={Co-editor of the special issue “Capitalist crisis, communication &#38; culture“}, volume={8}, number={2}, journal={tripleC (cognition, communication, co-operation)}, author={Fuchs, Christian and Schafranek, Matthias and Hakken, David and Breen, Marcus}, year={2010}, pages={193–309} }","ama":"Fuchs C, Schafranek M, Hakken D, Breen M. Co-editor of the special issue “Capitalist crisis, communication &#38; culture“. <i>tripleC (cognition, communication, co-operation)</i>. 2010;8(2):193-309.","mla":"Fuchs, Christian, et al. “Co-Editor of the Special Issue “Capitalist Crisis, Communication &#38; Culture“.” <i>TripleC (Cognition, Communication, Co-Operation)</i>, vol. 8, no. 2, 2010, pp. 193–309.","chicago":"Fuchs, Christian, Matthias Schafranek, David Hakken, and Marcus Breen. “Co-Editor of the Special Issue “Capitalist Crisis, Communication &#38; Culture“.” <i>TripleC (Cognition, Communication, Co-Operation)</i> 8, no. 2 (2010): 193–309.","short":"C. Fuchs, M. Schafranek, D. Hakken, M. Breen, TripleC (Cognition, Communication, Co-Operation) 8 (2010) 193–309.","ieee":"C. Fuchs, M. Schafranek, D. Hakken, and M. Breen, “Co-editor of the special issue “Capitalist crisis, communication &#38; culture“,” <i>tripleC (cognition, communication, co-operation)</i>, vol. 8, no. 2, pp. 193–309, 2010.","apa":"Fuchs, C., Schafranek, M., Hakken, D., &#38; Breen, M. (2010). Co-editor of the special issue “Capitalist crisis, communication &#38; culture“. <i>TripleC (Cognition, Communication, Co-Operation)</i>, <i>8</i>(2), 193–309."},"issue":"2","publication":"tripleC (cognition, communication, co-operation)","extern":"1","date_created":"2023-02-03T23:50:47Z","department":[{"_id":"136"}],"oa":"1","type":"journal_article"},{"status":"public","_id":"41676","page":"41-59","volume":2,"user_id":"49063","citation":{"ama":"Fuchs C, Hofkirchner W, Schafranek M, Raffl C, Sandoval M, Bichler R. Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0. <i>Future Internet</i>. 2010;2(1):41-59. doi:<a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>","bibtex":"@article{Fuchs_Hofkirchner_Schafranek_Raffl_Sandoval_Bichler_2010, title={Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0}, volume={2}, DOI={<a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>}, number={1}, journal={Future Internet}, author={Fuchs, Christian and Hofkirchner, Wolfgang and Schafranek, Matthias and Raffl, Celina and Sandoval, Marisol and Bichler, Robert}, year={2010}, pages={41–59} }","mla":"Fuchs, Christian, et al. “Theoretical Foundations of the Web: Cognition, Communication, and Co-Operation. Towards an Understanding of Web 1.0, 2.0, 3.0.” <i>Future Internet</i>, vol. 2, no. 1, 2010, pp. 41–59, doi:<a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>.","short":"C. Fuchs, W. Hofkirchner, M. Schafranek, C. Raffl, M. Sandoval, R. Bichler, Future Internet 2 (2010) 41–59.","chicago":"Fuchs, Christian, Wolfgang Hofkirchner, Matthias Schafranek, Celina Raffl, Marisol Sandoval, and Robert Bichler. “Theoretical Foundations of the Web: Cognition, Communication, and Co-Operation. Towards an Understanding of Web 1.0, 2.0, 3.0.” <i>Future Internet</i> 2, no. 1 (2010): 41–59. <a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>.","apa":"Fuchs, C., Hofkirchner, W., Schafranek, M., Raffl, C., Sandoval, M., &#38; Bichler, R. (2010). Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0. <i>Future Internet</i>, <i>2</i>(1), 41–59. <a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>","ieee":"C. Fuchs, W. Hofkirchner, M. Schafranek, C. Raffl, M. Sandoval, and R. Bichler, “Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0,” <i>Future Internet</i>, vol. 2, no. 1, pp. 41–59, 2010, doi: <a href=\"https://doi.org/10.3390/fi2010041\">https://doi.org/10.3390/fi2010041</a>."},"oa":"1","author":[{"full_name":"Fuchs, Christian","first_name":"Christian","orcid":"0000-0003-0589-4579","last_name":"Fuchs","id":"21863"},{"first_name":"Wolfgang","last_name":"Hofkirchner","full_name":"Hofkirchner, Wolfgang"},{"first_name":"Matthias","last_name":"Schafranek","full_name":"Schafranek, Matthias"},{"full_name":"Raffl, Celina","first_name":"Celina","last_name":"Raffl"},{"last_name":"Sandoval","first_name":"Marisol","full_name":"Sandoval, Marisol"},{"last_name":"Bichler","first_name":"Robert","full_name":"Bichler, Robert"}],"title":"Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0","year":"2010","intvolume":"         2","date_updated":"2023-03-08T03:23:22Z","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://doi.org/10.3390/fi2010041","open_access":"1"}],"doi":"https://doi.org/10.3390/fi2010041","publication":"Future Internet","issue":"1","extern":"1","date_created":"2023-02-04T00:18:55Z","department":[{"_id":"136"}],"type":"journal_article"},{"status":"public","_id":"41659","page":"193-204","volume":8,"user_id":"49063","citation":{"mla":"Fuchs, Christian, et al. “Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of TripleC.” <i>TripleC (Cognition, Communication, Co-Operation): Journal for a Global Sustainable Information Society</i>, vol. 8, no. 2, 2010, pp. 193–204, doi:<a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>.","ama":"Fuchs C, Schafranek M, Hakken D, Breen M. Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of tripleC. <i>tripleC (Cognition, Communication, Co-operation): Journal for a Global Sustainable Information Society</i>. 2010;8(2):193-204. doi:<a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>","bibtex":"@article{Fuchs_Schafranek_Hakken_Breen_2010, title={Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of tripleC}, volume={8}, DOI={<a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>}, number={2}, journal={tripleC (Cognition, Communication, Co-operation): Journal for a Global Sustainable Information Society}, author={Fuchs, Christian and Schafranek, Matthias and Hakken, David and Breen, Marcus}, year={2010}, pages={193–204} }","apa":"Fuchs, C., Schafranek, M., Hakken, D., &#38; Breen, M. (2010). Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of tripleC. <i>TripleC (Cognition, Communication, Co-Operation): Journal for a Global Sustainable Information Society</i>, <i>8</i>(2), 193–204. <a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>","ieee":"C. Fuchs, M. Schafranek, D. Hakken, and M. Breen, “Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of tripleC,” <i>tripleC (Cognition, Communication, Co-operation): Journal for a Global Sustainable Information Society</i>, vol. 8, no. 2, pp. 193–204, 2010, doi: <a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>.","short":"C. Fuchs, M. Schafranek, D. Hakken, M. Breen, TripleC (Cognition, Communication, Co-Operation): Journal for a Global Sustainable Information Society 8 (2010) 193–204.","chicago":"Fuchs, Christian, Matthias Schafranek, David Hakken, and Marcus Breen. “Capitalist Crisis, Communication, &#38; Culture – Introduction to the Special Issue of TripleC.” <i>TripleC (Cognition, Communication, Co-Operation): Journal for a Global Sustainable Information Society</i> 8, no. 2 (2010): 193–204. <a href=\"https://doi.org/10.31269/triplec.v8i2.228\">https://doi.org/10.31269/triplec.v8i2.228</a>."},"oa":"1","author":[{"full_name":"Fuchs, Christian","first_name":"Christian","last_name":"Fuchs","orcid":"0000-0003-0589-4579","id":"21863"},{"full_name":"Schafranek, Matthias","first_name":"Matthias","last_name":"Schafranek"},{"last_name":"Hakken","first_name":"David","full_name":"Hakken, David"},{"last_name":"Breen","first_name":"Marcus","full_name":"Breen, Marcus"}],"title":"Capitalist Crisis, Communication, & Culture – Introduction to the Special Issue of tripleC","year":"2010","intvolume":"         8","date_updated":"2023-03-08T03:02:53Z","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://doi.org/10.31269/triplec.v8i2.228","open_access":"1"}],"doi":"https://doi.org/10.31269/triplec.v8i2.228","publication":"tripleC (Cognition, Communication, Co-operation): Journal for a Global Sustainable Information Society","issue":"2","extern":"1","date_created":"2023-02-03T23:44:42Z","department":[{"_id":"136"}],"type":"journal_article"},{"related_material":{"record":[{"id":"22761","relation":"other","status":"public"}]},"abstract":[{"lang":"eng","text":"We present an implementation of the GW approximation for the electronic self-energy within the full-potential linearized augmented-plane-wave (FLAPW) method. The algorithm uses an all-electron mixed product basis for the representation of response matrices and related quantities. This basis is derived from the FLAPW basis and is exact for wave-function products. The correlation part of the self-energy is calculated on the imaginary-frequency axis with a subsequent analytic continuation to the real axis. As an alternative we can perform the frequency convolution of the Green function G and the dynamically screened Coulomb interaction W explicitly by a contour integration. The singularity of the bare and screened interaction potentials gives rise to a numerically important self-energy contribution, which we treat analytically to achieve good convergence with respect to the k-point sampling. As numerical realizations of the GW approximation typically suffer from the high computational expense required for the evaluation of the nonlocal and frequency-dependent self-energy, we demonstrate how the algorithm can be made very efficient by exploiting spatial and time-reversal symmetry as well as by applying an optimization of the mixed product basis that retains only the numerically important contributions of the electron-electron interaction. This optimization step reduces the basis size without compromising the accuracy and accelerates the code considerably. Furthermore, we demonstrate that one can employ an extrapolar approximation for high-lying states to reduce the number of empty states that must be taken into account explicitly in the construction of the polarization function and the self-energy. We show convergence tests, CPU timings, and results for prototype semiconductors and insulators as well as ferromagnetic nickel."}],"publication":"Physical Review B","issue":"12","department":[{"_id":"296"},{"_id":"35"},{"_id":"15"},{"_id":"170"}],"type":"journal_article","date_created":"2020-08-28T11:26:20Z","file":[{"date_created":"2020-08-28T11:29:11Z","access_level":"open_access","file_name":"PhysRevB.81.125102.pdf","creator":"schindlm","description":"© 2010 American Physical Society","file_size":330212,"date_updated":"2020-08-30T15:06:54Z","relation":"main_file","content_type":"application/pdf","file_id":"18559","title":"Efficient implementation of the GW approximation within the all-electron FLAPW method"}],"intvolume":"        81","article_type":"original","date_updated":"2023-04-20T14:57:10Z","publication_status":"published","author":[{"first_name":"Christoph","last_name":"Friedrich","full_name":"Friedrich, Christoph"},{"first_name":"Stefan","last_name":"Blügel","full_name":"Blügel, Stefan"},{"id":"458","first_name":"Arno","last_name":"Schindlmayr","orcid":"0000-0002-4855-071X","full_name":"Schindlmayr, Arno"}],"publication_identifier":{"issn":["1098-0121"],"eissn":["1550-235X"]},"year":"2010","title":"Efficient implementation of the GW approximation within the all-electron FLAPW method","doi":"10.1103/PhysRevB.81.125102","language":[{"iso":"eng"}],"article_number":"125102","quality_controlled":"1","citation":{"bibtex":"@article{Friedrich_Blügel_Schindlmayr_2010, title={Efficient implementation of the GW approximation within the all-electron FLAPW method}, volume={81}, DOI={<a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">10.1103/PhysRevB.81.125102</a>}, number={12125102}, journal={Physical Review B}, publisher={American Physical Society}, author={Friedrich, Christoph and Blügel, Stefan and Schindlmayr, Arno}, year={2010} }","ama":"Friedrich C, Blügel S, Schindlmayr A. Efficient implementation of the GW approximation within the all-electron FLAPW method. <i>Physical Review B</i>. 2010;81(12). doi:<a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">10.1103/PhysRevB.81.125102</a>","mla":"Friedrich, Christoph, et al. “Efficient Implementation of the GW Approximation within the All-Electron FLAPW Method.” <i>Physical Review B</i>, vol. 81, no. 12, 125102, American Physical Society, 2010, doi:<a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">10.1103/PhysRevB.81.125102</a>.","chicago":"Friedrich, Christoph, Stefan Blügel, and Arno Schindlmayr. “Efficient Implementation of the GW Approximation within the All-Electron FLAPW Method.” <i>Physical Review B</i> 81, no. 12 (2010). <a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">https://doi.org/10.1103/PhysRevB.81.125102</a>.","short":"C. Friedrich, S. Blügel, A. Schindlmayr, Physical Review B 81 (2010).","ieee":"C. Friedrich, S. Blügel, and A. Schindlmayr, “Efficient implementation of the GW approximation within the all-electron FLAPW method,” <i>Physical Review B</i>, vol. 81, no. 12, Art. no. 125102, 2010, doi: <a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">10.1103/PhysRevB.81.125102</a>.","apa":"Friedrich, C., Blügel, S., &#38; Schindlmayr, A. (2010). Efficient implementation of the GW approximation within the all-electron FLAPW method. <i>Physical Review B</i>, <i>81</i>(12), Article 125102. <a href=\"https://doi.org/10.1103/PhysRevB.81.125102\">https://doi.org/10.1103/PhysRevB.81.125102</a>"},"isi":"1","file_date_updated":"2020-08-30T15:06:54Z","oa":"1","external_id":{"arxiv":["1003.0316"],"isi":["000276248900039"]},"has_accepted_license":"1","status":"public","volume":81,"ddc":["530"],"user_id":"16199","_id":"18558","publisher":"American Physical Society"},{"oa":"1","department":[{"_id":"681"}],"type":"working_paper","place":"Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, Lüneburg","date_created":"2024-11-27T10:10:09Z","citation":{"apa":"Pfeifer, C., Janssen, S., Yang, P., &#38; Backes-Gellner, U. (2010). <i> Training participation of an aging workforce in an internal  labor market</i> (Vol. 170).","ieee":"C. Pfeifer, S. Janssen, P. Yang, and U. Backes-Gellner, <i> Training participation of an aging workforce in an internal  labor market</i>, vol. 170. Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, Lüneburg, 2010.","short":"C. Pfeifer, S. Janssen, P. Yang, U. Backes-Gellner,  Training Participation of an Aging Workforce in an Internal  Labor Market, Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, Lüneburg, 2010.","chicago":"Pfeifer, Christian, Simon Janssen, Philip Yang, and Uschi Backes-Gellner. <i> Training Participation of an Aging Workforce in an Internal  Labor Market</i>. Vol. 170. Working Paper Series in  Economics. Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, Lüneburg, 2010.","mla":"Pfeifer, Christian, et al. <i> Training Participation of an Aging Workforce in an Internal  Labor Market</i>. 2010.","ama":"Pfeifer C, Janssen S, Yang P, Backes-Gellner U. <i> Training Participation of an Aging Workforce in an Internal  Labor Market</i>. Vol 170.; 2010.","bibtex":"@book{Pfeifer_Janssen_Yang_Backes-Gellner_2010, place={Leuphana Universität Lüneburg, Institut für Volkswirtschaftslehre, Lüneburg}, series={Working Paper Series in  Economics}, title={ Training participation of an aging workforce in an internal  labor market}, volume={170}, author={Pfeifer, Christian and Janssen, Simon and Yang, Philip and Backes-Gellner, Uschi}, year={2010}, collection={Working Paper Series in  Economics} }"},"volume":170,"user_id":"80877","_id":"57456","language":[{"iso":"eng"}],"series_title":"Working Paper Series in  Economics","main_file_link":[{"open_access":"1","url":"https://www.econstor.eu/handle/10419/57165"}],"intvolume":"       170","date_updated":"2025-04-09T10:57:27Z","author":[{"first_name":"Christian","last_name":"Pfeifer","full_name":"Pfeifer, Christian"},{"full_name":"Janssen, Simon","last_name":"Janssen","first_name":"Simon"},{"id":"100432","last_name":"Yang","first_name":"Philip","full_name":"Yang, Philip"},{"full_name":"Backes-Gellner, Uschi","last_name":"Backes-Gellner","first_name":"Uschi"}],"status":"public","year":"2010","title":" Training participation of an aging workforce in an internal  labor market"},{"volume":81,"user_id":"16199","ddc":["530"],"publisher":"American Physical Society","_id":"18560","has_accepted_license":"1","status":"public","oa":"1","external_id":{"arxiv":["1002.4897"],"isi":["000274998000084"]},"quality_controlled":"1","citation":{"bibtex":"@article{Şaşıoğlu_Schindlmayr_Friedrich_Freimuth_Blügel_2010, title={Wannier-function approach to spin excitations in solids}, volume={81}, DOI={<a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">10.1103/PhysRevB.81.054434</a>}, number={5054434}, journal={Physical Review B}, publisher={American Physical Society}, author={Şaşıoğlu, Ersoy and Schindlmayr, Arno and Friedrich, Christoph and Freimuth, Frank and Blügel, Stefan}, year={2010} }","chicago":"Şaşıoğlu, Ersoy, Arno Schindlmayr, Christoph Friedrich, Frank Freimuth, and Stefan Blügel. “Wannier-Function Approach to Spin Excitations in Solids.” <i>Physical Review B</i> 81, no. 5 (2010). <a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">https://doi.org/10.1103/PhysRevB.81.054434</a>.","short":"E. Şaşıoğlu, A. Schindlmayr, C. Friedrich, F. Freimuth, S. Blügel, Physical Review B 81 (2010).","ama":"Şaşıoğlu E, Schindlmayr A, Friedrich C, Freimuth F, Blügel S. Wannier-function approach to spin excitations in solids. <i>Physical Review B</i>. 2010;81(5). doi:<a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">10.1103/PhysRevB.81.054434</a>","ieee":"E. Şaşıoğlu, A. Schindlmayr, C. Friedrich, F. Freimuth, and S. Blügel, “Wannier-function approach to spin excitations in solids,” <i>Physical Review B</i>, vol. 81, no. 5, Art. no. 054434, 2010, doi: <a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">10.1103/PhysRevB.81.054434</a>.","apa":"Şaşıoğlu, E., Schindlmayr, A., Friedrich, C., Freimuth, F., &#38; Blügel, S. (2010). Wannier-function approach to spin excitations in solids. <i>Physical Review B</i>, <i>81</i>(5), Article 054434. <a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">https://doi.org/10.1103/PhysRevB.81.054434</a>","mla":"Şaşıoğlu, Ersoy, et al. “Wannier-Function Approach to Spin Excitations in Solids.” <i>Physical Review B</i>, vol. 81, no. 5, 054434, American Physical Society, 2010, doi:<a href=\"https://doi.org/10.1103/PhysRevB.81.054434\">10.1103/PhysRevB.81.054434</a>."},"isi":"1","file_date_updated":"2020-08-30T15:06:10Z","doi":"10.1103/PhysRevB.81.054434","language":[{"iso":"eng"}],"article_number":"054434","article_type":"original","intvolume":"        81","publication_status":"published","date_updated":"2025-12-16T11:09:51Z","author":[{"full_name":"Şaşıoğlu, Ersoy","last_name":"Şaşıoğlu","first_name":"Ersoy"},{"orcid":"0000-0002-4855-071X","first_name":"Arno","last_name":"Schindlmayr","full_name":"Schindlmayr, Arno","id":"458"},{"full_name":"Friedrich, Christoph","last_name":"Friedrich","first_name":"Christoph"},{"first_name":"Frank","last_name":"Freimuth","full_name":"Freimuth, Frank"},{"first_name":"Stefan","last_name":"Blügel","full_name":"Blügel, Stefan"}],"publication_identifier":{"eissn":["1550-235X"],"issn":["1098-0121"]},"year":"2010","title":"Wannier-function approach to spin excitations in solids","department":[{"_id":"296"},{"_id":"35"},{"_id":"15"},{"_id":"170"},{"_id":"230"}],"type":"journal_article","date_created":"2020-08-28T11:31:26Z","file":[{"date_created":"2020-08-28T11:33:17Z","description":"© 2010 American Physical Society","creator":"schindlm","file_id":"18561","content_type":"application/pdf","title":"Wannier-function approach to spin excitations in solids","file_name":"PhysRevB.81.054434.pdf","access_level":"open_access","file_size":711970,"relation":"main_file","date_updated":"2020-08-30T15:06:10Z"}],"abstract":[{"text":"We present a computational scheme to study spin excitations in magnetic materials from first principles. The central quantity is the transverse spin susceptibility, from which the complete excitation spectrum, including single-particle spin-flip Stoner excitations and collective spin-wave modes, can be obtained. The susceptibility is derived from many-body perturbation theory and includes dynamic correlation through a summation over ladder diagrams that describe the coupling of electrons and holes with opposite spins. In contrast to earlier studies, we do not use a model potential with adjustable parameters for the electron-hole interaction but employ the random-phase approximation. To reduce the numerical cost for the calculation of the four-point scattering matrix we perform a projection onto maximally localized Wannier functions, which allows us to truncate the matrix efficiently by exploiting the short spatial range of electronic correlation in the partially filled d or f orbitals. Our implementation is based on the full-potential linearized augmented-plane-wave method. Starting from a ground-state calculation within the local-spin-density approximation (LSDA), we first analyze the matrix elements of the screened Coulomb potential in the Wannier basis for the 3d transition-metal series. In particular, we discuss the differences between a constrained nonmagnetic and a proper spin-polarized treatment for the ferromagnets Fe, Co, and Ni. The spectrum of single-particle and collective spin excitations in fcc Ni is then studied in detail. The calculated spin-wave dispersion is in good overall agreement with experimental data and contains both an acoustic and an optical branch for intermediate wave vectors along the [100] direction. In addition, we find evidence for a similar double-peak structure in the spectral function along the [111] direction. To investigate the influence of static correlation we finally consider LSDA+U as an alternative starting point and show that, together with an improved description of the Fermi surface, it yields a more accurate quantitative value for the spin-wave stiffness constant, which is overestimated in the LSDA.","lang":"eng"}],"publication":"Physical Review B","issue":"5"},{"oa":"1","citation":{"bibtex":"@inproceedings{Classen_Förstner_Meier_Schuhmann_2010, title={Enhanced FDTD edge correction for nonlinear effects calculation}, DOI={<a href=\"https://doi.org/10.1109/aps.2010.5562017\">10.1109/aps.2010.5562017</a>}, number={11515155}, booktitle={2010 IEEE Antennas and Propagation Society International Symposium}, publisher={IEEE}, author={Classen, C and Förstner, Jens and Meier, Torsten and Schuhmann, R}, year={2010} }","ama":"Classen C, Förstner J, Meier T, Schuhmann R. Enhanced FDTD edge correction for nonlinear effects calculation. In: <i>2010 IEEE Antennas and Propagation Society International Symposium</i>. IEEE; 2010. doi:<a href=\"https://doi.org/10.1109/aps.2010.5562017\">10.1109/aps.2010.5562017</a>","short":"C. Classen, J. Förstner, T. Meier, R. Schuhmann, in: 2010 IEEE Antennas and Propagation Society International Symposium, IEEE, 2010.","chicago":"Classen, C, Jens Förstner, Torsten Meier, and R Schuhmann. “Enhanced FDTD Edge Correction for Nonlinear Effects Calculation.” In <i>2010 IEEE Antennas and Propagation Society International Symposium</i>. IEEE, 2010. <a href=\"https://doi.org/10.1109/aps.2010.5562017\">https://doi.org/10.1109/aps.2010.5562017</a>.","ieee":"C. Classen, J. Förstner, T. Meier, and R. Schuhmann, “Enhanced FDTD edge correction for nonlinear effects calculation,” presented at the 2010 IEEE international Symposium Antennas, Toronto, ON, Canada, 2010, doi: <a href=\"https://doi.org/10.1109/aps.2010.5562017\">10.1109/aps.2010.5562017</a>.","mla":"Classen, C., et al. “Enhanced FDTD Edge Correction for Nonlinear Effects Calculation.” <i>2010 IEEE Antennas and Propagation Society International Symposium</i>, 11515155, IEEE, 2010, doi:<a href=\"https://doi.org/10.1109/aps.2010.5562017\">10.1109/aps.2010.5562017</a>.","apa":"Classen, C., Förstner, J., Meier, T., &#38; Schuhmann, R. (2010). Enhanced FDTD edge correction for nonlinear effects calculation. <i>2010 IEEE Antennas and Propagation Society International Symposium</i>, Article 11515155. 2010 IEEE international Symposium Antennas, Toronto, ON, Canada. <a href=\"https://doi.org/10.1109/aps.2010.5562017\">https://doi.org/10.1109/aps.2010.5562017</a>"},"file_date_updated":"2018-09-04T19:31:42Z","ddc":["530"],"user_id":"16199","urn":"41677","_id":"4167","publisher":"IEEE","has_accepted_license":"1","conference":{"end_date":"2010-07-17","location":"Toronto, ON, Canada","name":"2010 IEEE international Symposium Antennas","start_date":"2010-07-11"},"status":"public","department":[{"_id":"61"},{"_id":"15"},{"_id":"293"},{"_id":"170"},{"_id":"230"},{"_id":"35"},{"_id":"34"}],"keyword":["tet_topic_numerics"],"type":"conference","date_created":"2018-08-28T08:34:52Z","file":[{"creator":"hclaudia","date_created":"2018-08-28T08:36:44Z","relation":"main_file","date_updated":"2018-09-04T19:31:42Z","file_name":"2010 Classen,Förstner, Meier T,Schuhmann_Enhanced FDTD edge correction for nonlinear effects calculation.pdf","access_level":"open_access","file_size":209412,"file_id":"4168","content_type":"application/pdf"}],"abstract":[{"lang":"eng","text":"The electromagnetic field in the vicinity of sharp edges needs a special treatment in numeric calculation whenever accurate, fast converging results are necessary. One of the fundamental works concerning field singularities has been proposed in 1972 [1] and states that the electromagnetic energy density must be integrable over any finite\r\ndomain, even if this domain contains singularities. It is shown, that the magnetic field \u0002H(\u0003, ϕ) and electric field \u0002E(\u0003, ϕ) are proportional to ∝ \u0003(t−1) for \u0003 → 0. The variable \u0003 is the distance to the edge and t has to fulfill the integrability condition and thus is restricted to 0 < t < 1. This result is often used to reduce the error corresponding to the singularity without increasing the numerical effort [2 - 5]. For this purpose, a correction factor K is estimated by inserting the proportionality into the wave equation. It is shown, that this method improves the accuracy of the result significantly, however the order of convergence is often not studied. In [4] a method to modify the material parameters in order to use analytic results to improve the numeric calculation is presented. In this contribution we will - inspired by the scheme given in [4] - develop a new method to estimate a correction factor for perfect conducting materials (PEC) and demonstrate the improvement of the results compared to the standard edge correction. Therefore analytic results (comparable to [1]) are consequently merged with the scheme in [4]. The main goal of this work is the calculation of the second harmonic generation (SHG) in the wave response of so-called metamaterials [6]. Frequently these structures\r\ncontain sharp metallic edges with field singularities at the interfaces which have a strong impact on the SHG signals. Thus, an accurate simulation of singularities is highly important. However, the following approach can also be applied to many other setups, and one of them is shown in the example below."}],"publication":"2010 IEEE Antennas and Propagation Society International Symposium","doi":"10.1109/aps.2010.5562017","language":[{"iso":"eng"}],"article_number":"11515155 ","date_updated":"2025-12-16T12:35:39Z","publication_status":"published","publication_identifier":{"isbn":["9781424449675","9781424449682"]},"author":[{"full_name":"Classen, C","last_name":"Classen","first_name":"C"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens","id":"158"},{"id":"344","first_name":"Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","full_name":"Meier, Torsten"},{"first_name":"R","last_name":"Schuhmann","full_name":"Schuhmann, R"}],"title":"Enhanced FDTD edge correction for nonlinear effects calculation","year":"2010"},{"date_created":"2018-08-28T08:50:06Z","file":[{"file_id":"4173","content_type":"application/pdf","relation":"main_file","date_updated":"2018-09-04T20:02:01Z","file_name":"2010 Piegdon,Declair,Förstner,Meier T,Matthias,Urbanski,Kitzerow,Reuter,Wieck,Lorcke,Meier C_Tuning quantum-dot based photonic devices with liquid crystals.pdf","access_level":"open_access","file_size":627755,"date_created":"2018-08-28T08:52:50Z","creator":"hclaudia"}],"department":[{"_id":"15"},{"_id":"287"},{"_id":"293"},{"_id":"292"},{"_id":"35"},{"_id":"230"},{"_id":"313"},{"_id":"170"},{"_id":"27"},{"_id":"34"},{"_id":"61"}],"type":"journal_article","keyword":["tet_topic_qd","tet_topic_microdisk"],"issue":"8","publication":"Optics Express","abstract":[{"text":"Microdisks made from GaAs with embedded InAs quantum dots are immersed in the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as emitters feeding the optical modes of the photonic cavity. By changing temperature, the liquid crystal undergoes a phase transition from the isotropic to the nematic state, which can be used\r\nas an effective tuning mechanism of the photonic modes of the cavity. In the nematic state, the uniaxial electrical anisotropy of the liquid crystal molecules can be exploited for orienting the material in an electric field,\r\nthus externally controlling the birefringence of the material. Using this effect, an electric field induced tuning of the modes is achieved. Numerical simulations using the finite-differences time-domain (FDTD) technique\r\nemploying an anisotropic dielectric medium allow to understand the alignment of the liquid crystal molecules on the surface of the microdisk resonator.","lang":"eng"}],"language":[{"iso":"eng"}],"article_number":"7946","doi":"10.1364/oe.18.007946","publication_identifier":{"issn":["1094-4087"]},"author":[{"full_name":"Piegdon, Karoline A.","first_name":"Karoline A.","last_name":"Piegdon"},{"first_name":"Stefan","last_name":"Declair","full_name":"Declair, Stefan"},{"id":"158","last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"},{"first_name":"Torsten","orcid":"0000-0001-8864-2072","last_name":"Meier","full_name":"Meier, Torsten","id":"344"},{"full_name":"Matthias, Heiner","last_name":"Matthias","first_name":"Heiner"},{"full_name":"Urbanski, Martin","first_name":"Martin","last_name":"Urbanski"},{"id":"254","last_name":"Kitzerow","first_name":"Heinz-Siegfried","full_name":"Kitzerow, Heinz-Siegfried"},{"id":"37763","full_name":"Reuter, Dirk","last_name":"Reuter","first_name":"Dirk"},{"first_name":"Andreas D.","last_name":"Wieck","full_name":"Wieck, Andreas D."},{"full_name":"Lorke, Axel","first_name":"Axel","last_name":"Lorke"},{"first_name":"Cedrik","orcid":"https://orcid.org/0000-0002-3787-3572","last_name":"Meier","full_name":"Meier, Cedrik","id":"20798"}],"title":"Tuning quantum-dot based photonic devices with liquid crystals","year":"2010","article_type":"original","intvolume":"        18","publication_status":"published","date_updated":"2025-12-16T16:44:44Z","oa":"1","citation":{"ieee":"K. A. Piegdon <i>et al.</i>, “Tuning quantum-dot based photonic devices with liquid crystals,” <i>Optics Express</i>, vol. 18, no. 8, Art. no. 7946, 2010, doi: <a href=\"https://doi.org/10.1364/oe.18.007946\">10.1364/oe.18.007946</a>.","apa":"Piegdon, K. A., Declair, S., Förstner, J., Meier, T., Matthias, H., Urbanski, M., Kitzerow, H.-S., Reuter, D., Wieck, A. D., Lorke, A., &#38; Meier, C. (2010). Tuning quantum-dot based photonic devices with liquid crystals. <i>Optics Express</i>, <i>18</i>(8), Article 7946. <a href=\"https://doi.org/10.1364/oe.18.007946\">https://doi.org/10.1364/oe.18.007946</a>","chicago":"Piegdon, Karoline A., Stefan Declair, Jens Förstner, Torsten Meier, Heiner Matthias, Martin Urbanski, Heinz-Siegfried Kitzerow, et al. “Tuning Quantum-Dot Based Photonic Devices with Liquid Crystals.” <i>Optics Express</i> 18, no. 8 (2010). <a href=\"https://doi.org/10.1364/oe.18.007946\">https://doi.org/10.1364/oe.18.007946</a>.","short":"K.A. Piegdon, S. Declair, J. Förstner, T. Meier, H. Matthias, M. Urbanski, H.-S. Kitzerow, D. Reuter, A.D. Wieck, A. Lorke, C. Meier, Optics Express 18 (2010).","mla":"Piegdon, Karoline A., et al. “Tuning Quantum-Dot Based Photonic Devices with Liquid Crystals.” <i>Optics Express</i>, vol. 18, no. 8, 7946, The Optical Society, 2010, doi:<a href=\"https://doi.org/10.1364/oe.18.007946\">10.1364/oe.18.007946</a>.","bibtex":"@article{Piegdon_Declair_Förstner_Meier_Matthias_Urbanski_Kitzerow_Reuter_Wieck_Lorke_et al._2010, title={Tuning quantum-dot based photonic devices with liquid crystals}, volume={18}, DOI={<a href=\"https://doi.org/10.1364/oe.18.007946\">10.1364/oe.18.007946</a>}, number={87946}, journal={Optics Express}, publisher={The Optical Society}, author={Piegdon, Karoline A. and Declair, Stefan and Förstner, Jens and Meier, Torsten and Matthias, Heiner and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Reuter, Dirk and Wieck, Andreas D. and Lorke, Axel and et al.}, year={2010} }","ama":"Piegdon KA, Declair S, Förstner J, et al. Tuning quantum-dot based photonic devices with liquid crystals. <i>Optics Express</i>. 2010;18(8). doi:<a href=\"https://doi.org/10.1364/oe.18.007946\">10.1364/oe.18.007946</a>"},"file_date_updated":"2018-09-04T20:02:01Z","project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"urn":"41725","_id":"4172","publisher":"The Optical Society","volume":18,"user_id":"16199","ddc":["530"],"status":"public","has_accepted_license":"1"},{"user_id":"405","editor":[{"full_name":"French, Simon","last_name":"French","first_name":"Simon"},{"first_name":"Brian","last_name":"Tomaszewski","full_name":"Tomaszewski, Brian"},{"last_name":"Zobel","first_name":"Chris","full_name":"Zobel, Chris"}],"main_file_link":[{"url":"http://idl.iscram.org/files/pottebaum/2010/847_Pottebaum_etal2010.pdf","open_access":"1"}],"_id":"24065","language":[{"iso":"eng"}],"date_updated":"2026-03-31T03:52:00Z","status":"public","year":"2010","title":"Design and modeling of a domain ontology for fire protection","author":[{"last_name":"Pottebaum","orcid":"http://orcid.org/0000-0001-8778-2989","first_name":"Jens","full_name":"Pottebaum, Jens","id":"405"},{"last_name":"Japs","first_name":"Anna Maria","full_name":"Japs, Anna Maria"},{"full_name":"Prödel, Stephan","last_name":"Prödel","first_name":"Stephan"},{"last_name":"Koch","first_name":"Rainer","full_name":"Koch, Rainer"}],"type":"conference","keyword":["Command and control process","Command and control systems","Design and modeling","Domain ontologies","Emergency response","Fire extinguishers","Fire protection","Heterogeneous domains","Information analysis","Information sharing","Information systems","Interoperability","Ontology language","Semantic technologies","Semantic Web","Semantics"],"oa":"1","date_created":"2021-09-09T12:27:14Z","place":"Seattle, WA","quality_controlled":"1","publication":"ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management","citation":{"ieee":"J. Pottebaum, A. M. Japs, S. Prödel, and R. Koch, “Design and modeling of a domain ontology for fire protection,” in <i>ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management</i>, 2010.","apa":"Pottebaum, J., Japs, A. M., Prödel, S., &#38; Koch, R. (2010). Design and modeling of a domain ontology for fire protection. In S. French, B. Tomaszewski, &#38; C. Zobel (Eds.), <i>ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management</i>.","chicago":"Pottebaum, Jens, Anna Maria Japs, Stephan Prödel, and Rainer Koch. “Design and Modeling of a Domain Ontology for Fire Protection.” In <i>ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management</i>, edited by Simon French, Brian Tomaszewski, and Chris Zobel. Seattle, WA, 2010.","short":"J. Pottebaum, A.M. Japs, S. Prödel, R. Koch, in: S. French, B. Tomaszewski, C. Zobel (Eds.), ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management, Seattle, WA, 2010.","mla":"Pottebaum, Jens, et al. “Design and Modeling of a Domain Ontology for Fire Protection.” <i>ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management</i>, edited by Simon French et al., 2010.","bibtex":"@inproceedings{Pottebaum_Japs_Prödel_Koch_2010, place={Seattle, WA}, title={Design and modeling of a domain ontology for fire protection}, booktitle={ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management}, author={Pottebaum, Jens and Japs, Anna Maria and Prödel, Stephan and Koch, Rainer}, editor={French, Simon and Tomaszewski, Brian and Zobel, Chris}, year={2010} }","ama":"Pottebaum J, Japs AM, Prödel S, Koch R. Design and modeling of a domain ontology for fire protection. In: French S, Tomaszewski B, Zobel C, eds. <i>ISCRAM 2010 -- 7th International Conference on Information Systems for Crisis Response and Management</i>. ; 2010."}},{"main_file_link":[{"open_access":"1","url":"https://link.springer.com/chapter/10.1007/978-3-531-92108-2_18"}],"language":[{"iso":"ger"}],"publication_status":"published","date_updated":"2026-08-29T07:35:03Z","year":"2010","title":"Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung","author":[{"full_name":"Hirschauer, Maria","last_name":"Hirschauer","first_name":"Maria"},{"first_name":"Harry","orcid":"0000-0001-5488-5105","last_name":"Kullmann","full_name":"Kullmann, Harry","id":"77972"}],"publication_identifier":{"isbn":["978-3-531-16856-2"]},"type":"book_chapter","department":[{"_id":"556"}],"date_created":"2022-04-05T10:21:11Z","publication":"Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung","user_id":"105186","editor":[{"full_name":"Hagedorn, Jörg","first_name":"Jörg","last_name":"Hagedorn"},{"first_name":"Verena","last_name":"Schurt","full_name":"Schurt, Verena"},{"last_name":"Steber","first_name":"Corinna","full_name":"Steber, Corinna"},{"first_name":"Wiebke","last_name":"Waburg","full_name":"Waburg, Wiebke"}],"page":"351–374","_id":"30765","publisher":"VS Verlag für Sozialwissenschaften","edition":"1","status":"public","oa":"1","place":"Wiesbaden","citation":{"short":"M. Hirschauer, H. Kullmann, in: J. Hagedorn, V. Schurt, C. Steber, W. Waburg (Eds.), Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung, 1st ed., VS Verlag für Sozialwissenschaften, Wiesbaden, 2010, pp. 351–374.","chicago":"Hirschauer, Maria, and Harry Kullmann. “Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung.” In <i>Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung</i>, edited by Jörg Hagedorn, Verena Schurt, Corinna Steber, and Wiebke Waburg, 1st ed., 351–374. Wiesbaden: VS Verlag für Sozialwissenschaften, 2010.","ieee":"M. Hirschauer and H. Kullmann, “Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung,” in <i>Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung</i>, 1st ed., J. Hagedorn, V. Schurt, C. Steber, and W. Waburg, Eds. Wiesbaden: VS Verlag für Sozialwissenschaften, 2010, pp. 351–374.","apa":"Hirschauer, M., &#38; Kullmann, H. (2010). Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung. In J. Hagedorn, V. Schurt, C. Steber, &#38; W. Waburg (Eds.), <i>Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung</i> (1st ed., pp. 351–374). VS Verlag für Sozialwissenschaften.","bibtex":"@inbook{Hirschauer_Kullmann_2010, place={Wiesbaden}, edition={1}, title={Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung}, booktitle={Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung}, publisher={VS Verlag für Sozialwissenschaften}, author={Hirschauer, Maria and Kullmann, Harry}, editor={Hagedorn, Jörg and Schurt, Verena and Steber, Corinna and Waburg, Wiebke}, year={2010}, pages={351–374} }","ama":"Hirschauer M, Kullmann H. Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung. In: Hagedorn J, Schurt V, Steber C, Waburg W, eds. <i>Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung</i>. 1st ed. VS Verlag für Sozialwissenschaften; 2010:351–374.","mla":"Hirschauer, Maria, and Harry Kullmann. “Lehrerprofessionalität im Zeichen von Heterogenität - Stereotype bei Lehrkräften als kollegial zu bearbeitende Herausforderung.” <i>Ethnizität, Geschlecht, Familie und Schule. Heterogenität als erziehungswissenschaftliche Herausforderung</i>, edited by Jörg Hagedorn et al., 1st ed., VS Verlag für Sozialwissenschaften, 2010, pp. 351–374."}},{"department":[{"_id":"556"}],"keyword":["Beispiel","Gymnasium","Kooperation","Lehrerkooperation","Unterricht"],"type":"book","date_created":"2022-04-05T10:34:02Z","language":[{"iso":"ger"}],"series_title":"Empirische Erziehungswissenschaft","main_file_link":[{"open_access":"1","url":"https://d-nb.info/1235068307/34"}],"publication_status":"published","date_updated":"2026-08-29T08:18:46Z","author":[{"id":"77972","full_name":"Kullmann, Harry","orcid":"0000-0001-5488-5105","first_name":"Harry","last_name":"Kullmann"}],"publication_identifier":{"isbn":["978383092396"]},"year":"2010","title":"Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien","oa":"1","place":"Münster","quality_controlled":"1","citation":{"ieee":"H. Kullmann, <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien</i>, vol. Band 26. Münster: Waxmann, 2010.","apa":"Kullmann, H. (2010). <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien: Vol. Band 26</i>. Waxmann.","chicago":"Kullmann, Harry. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien</i>. Vol. Band 26. Empirische Erziehungswissenschaft. Münster: Waxmann, 2010.","short":"H. Kullmann, Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien, Waxmann, Münster, 2010.","mla":"Kullmann, Harry. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien</i>. Waxmann, 2010.","bibtex":"@book{Kullmann_2010, place={Münster}, series={Empirische Erziehungswissenschaft}, title={Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien}, volume={Band 26}, publisher={Waxmann}, author={Kullmann, Harry}, year={2010}, collection={Empirische Erziehungswissenschaft} }","ama":"Kullmann H. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen Unterrichts an Gymnasien</i>. Vol Band 26. Waxmann; 2010."},"volume":"Band 26","user_id":"105186","_id":"30778","publisher":"Waxmann","jel":["I21"],"status":"public"},{"date_updated":"2022-01-06T06:58:42Z","has_accepted_license":"1","status":"public","title":"Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens","year":"2009","author":[{"last_name":"Liske","first_name":"Gennadij","full_name":"Liske, Gennadij"}],"user_id":"25078","ddc":["000"],"urn":"28960","_id":"2896","file_date_updated":"2018-07-12T09:41:46Z","citation":{"mla":"Liske, Gennadij. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>. 2009.","ama":"Liske G. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>.; 2009.","bibtex":"@book{Liske_2009, title={Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens}, author={Liske, Gennadij}, year={2009} }","apa":"Liske, G. (2009). <i>Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens</i>.","ieee":"G. Liske, <i>Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens</i>. 2009.","short":"G. Liske, Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens, 2009.","chicago":"Liske, Gennadij. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>, 2009."},"supervisor":[{"full_name":"Blömer, Johannes","last_name":"Blömer","first_name":"Johannes"}],"type":"bachelorsthesis","department":[{"_id":"64"}],"oa":"1","file":[{"creator":"feidens","date_created":"2018-05-25T09:30:58Z","access_level":"open_access","file_size":1196648,"file_name":"2009_Liske_AnalyseUndEvaluationEinesIdentitaetsbasiertenSigncryptionVerfahrens.pdf","date_updated":"2018-07-12T09:41:46Z","relation":"main_file","content_type":"application/pdf","file_id":"2897"}],"date_created":"2018-05-25T09:31:04Z"},{"page":"771--780","_id":"1930","publisher":"Springer","urn":"19304","ddc":["040"],"user_id":"15504","volume":5878,"status":"public","has_accepted_license":"1","oa":"1","file_date_updated":"2018-04-13T10:05:53Z","citation":{"apa":"Jacob, R., Ritscher, S., Scheideler, C., &#38; Schmid, S. (2009). A Self-stabilizing and Local Delaunay Graph Construction. In <i>Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings</i> (Vol. 5878, pp. 771--780). Springer. <a href=\"https://doi.org/10.1007/978-3-642-10631-6_78\">https://doi.org/10.1007/978-3-642-10631-6_78</a>","ieee":"R. Jacob, S. Ritscher, C. Scheideler, and S. Schmid, “A Self-stabilizing and Local Delaunay Graph Construction,” in <i>Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings</i>, 2009, vol. 5878, pp. 771--780.","chicago":"Jacob, Riko, Stephan Ritscher, Christian Scheideler, and Stefan Schmid. “A Self-Stabilizing and Local Delaunay Graph Construction.” In <i>Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings</i>, 5878:771--780. Lecture Notes in Computer Science. Springer, 2009. <a href=\"https://doi.org/10.1007/978-3-642-10631-6_78\">https://doi.org/10.1007/978-3-642-10631-6_78</a>.","short":"R. Jacob, S. Ritscher, C. Scheideler, S. Schmid, in: Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings, Springer, 2009, pp. 771--780.","mla":"Jacob, Riko, et al. “A Self-Stabilizing and Local Delaunay Graph Construction.” <i>Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings</i>, vol. 5878, Springer, 2009, pp. 771--780, doi:<a href=\"https://doi.org/10.1007/978-3-642-10631-6_78\">10.1007/978-3-642-10631-6_78</a>.","ama":"Jacob R, Ritscher S, Scheideler C, Schmid S. A Self-stabilizing and Local Delaunay Graph Construction. In: <i>Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings</i>. Vol 5878. Lecture Notes in Computer Science. Springer; 2009:771--780. doi:<a href=\"https://doi.org/10.1007/978-3-642-10631-6_78\">10.1007/978-3-642-10631-6_78</a>","bibtex":"@inproceedings{Jacob_Ritscher_Scheideler_Schmid_2009, series={Lecture Notes in Computer Science}, title={A Self-stabilizing and Local Delaunay Graph Construction}, volume={5878}, DOI={<a href=\"https://doi.org/10.1007/978-3-642-10631-6_78\">10.1007/978-3-642-10631-6_78</a>}, booktitle={Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings}, publisher={Springer}, author={Jacob, Riko and Ritscher, Stephan and Scheideler, Christian and Schmid, Stefan}, year={2009}, pages={771--780}, collection={Lecture Notes in Computer Science} }"},"series_title":"Lecture Notes in Computer Science","doi":"10.1007/978-3-642-10631-6_78","title":"A Self-stabilizing and Local Delaunay Graph Construction","year":"2009","author":[{"full_name":"Jacob, Riko","first_name":"Riko","last_name":"Jacob"},{"last_name":"Ritscher","first_name":"Stephan","full_name":"Ritscher, Stephan"},{"id":"20792","full_name":"Scheideler, Christian","first_name":"Christian","last_name":"Scheideler"},{"last_name":"Schmid","first_name":"Stefan","full_name":"Schmid, Stefan"}],"date_updated":"2022-01-06T06:54:02Z","intvolume":"      5878","file":[{"date_updated":"2018-04-13T10:05:53Z","relation":"main_file","file_size":139275,"access_level":"open_access","file_name":"isaac09.pdf","content_type":"application/pdf","file_id":"2342","creator":"florida","date_created":"2018-04-13T10:05:53Z"}],"date_created":"2018-03-29T09:12:59Z","type":"conference","department":[{"_id":"79"}],"publication":"Algorithms and Computation, 20th International Symposium, ISAAC 2009, Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings"},{"oa":"1","citation":{"chicago":"Grodecka, A., P. Machnikowski, and Jens Förstner. “Indirect Spin Dephasing via Charge-State Decoherence in Optical Control Schemes in Quantum Dots.” <i>Physical Review A</i> 79, no. 4 (2009). <a href=\"https://doi.org/10.1103/physreva.79.042331\">https://doi.org/10.1103/physreva.79.042331</a>.","short":"A. Grodecka, P. Machnikowski, J. Förstner, Physical Review A 79 (2009).","ieee":"A. Grodecka, P. Machnikowski, and J. Förstner, “Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots,” <i>Physical Review A</i>, vol. 79, no. 4, 2009.","apa":"Grodecka, A., Machnikowski, P., &#38; Förstner, J. (2009). Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots. <i>Physical Review A</i>, <i>79</i>(4). <a href=\"https://doi.org/10.1103/physreva.79.042331\">https://doi.org/10.1103/physreva.79.042331</a>","bibtex":"@article{Grodecka_Machnikowski_Förstner_2009, title={Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots}, volume={79}, DOI={<a href=\"https://doi.org/10.1103/physreva.79.042331\">10.1103/physreva.79.042331</a>}, number={4042331}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Grodecka, A. and Machnikowski, P. and Förstner, Jens}, year={2009} }","ama":"Grodecka A, Machnikowski P, Förstner J. Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots. <i>Physical Review A</i>. 2009;79(4). doi:<a href=\"https://doi.org/10.1103/physreva.79.042331\">10.1103/physreva.79.042331</a>","mla":"Grodecka, A., et al. “Indirect Spin Dephasing via Charge-State Decoherence in Optical Control Schemes in Quantum Dots.” <i>Physical Review A</i>, vol. 79, no. 4, 042331, American Physical Society (APS), 2009, doi:<a href=\"https://doi.org/10.1103/physreva.79.042331\">10.1103/physreva.79.042331</a>."},"file_date_updated":"2018-09-04T19:36:35Z","urn":"41826","_id":"4182","publisher":"American Physical Society (APS)","volume":79,"user_id":"158","ddc":["530"],"status":"public","has_accepted_license":"1","date_created":"2018-08-28T09:32:32Z","file":[{"creator":"hclaudia","date_created":"2018-08-28T09:33:22Z","relation":"main_file","date_updated":"2018-09-04T19:36:35Z","file_name":"2009 Grodecka,Machnikowski,Förstner_Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots.pdf","access_level":"open_access","file_size":192120,"file_id":"4183","content_type":"application/pdf"}],"department":[{"_id":"15"}],"type":"journal_article","keyword":["tet_topic_qd"],"publication":"Physical Review A","issue":"4","abstract":[{"lang":"eng","text":"We demonstrate that an optically driven spin of a carrier in a quantum dot undergoes indirect dephasing via\r\nconditional optically induced charge evolution even in the absence of any direct interaction between the spin\r\nand its environment. A generic model for the indirect dephasing with a three-component system with spin,\r\ncharge, and reservoir is proposed. This indirect decoherence channel is studied for the optical spin manipulation\r\nin a quantum dot with a microscopic description of the charge-phonon interaction taking into account its\r\nnon-Markovian nature."}],"language":[{"iso":"eng"}],"article_number":"042331","doi":"10.1103/physreva.79.042331","author":[{"full_name":"Grodecka, A.","first_name":"A.","last_name":"Grodecka"},{"last_name":"Machnikowski","first_name":"P.","full_name":"Machnikowski, P."},{"full_name":"Förstner, Jens","first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","id":"158"}],"publication_identifier":{"issn":["1050-2947","1094-1622"]},"year":"2009","title":"Indirect spin dephasing via charge-state decoherence in optical control schemes in quantum dots","article_type":"original","intvolume":"        79","publication_status":"published","date_updated":"2022-01-06T07:00:31Z"},{"year":"2009","title":"Elektronische Wahlen: Verifizierung vs. Zertifizierung","status":"public","author":[{"first_name":"Melanie","last_name":"Volkamer","full_name":"Volkamer, Melanie"},{"full_name":"Schryen, Guido","first_name":"Guido","last_name":"Schryen","id":"72850"},{"last_name":"Langer","first_name":"Lucie","full_name":"Langer, Lucie"},{"full_name":"Schmidt, Axel","last_name":"Schmidt","first_name":"Axel"},{"last_name":"Buchmann","first_name":"Johannes","full_name":"Buchmann, Johannes"}],"date_updated":"2022-01-06T07:02:05Z","has_accepted_license":"1","language":[{"iso":"eng"}],"_id":"5597","user_id":"61579","ddc":["000"],"file_date_updated":"2018-12-18T13:15:26Z","publication":"Workshop Elektronische Wahlen, elektronische Teilhabe, Societyware, 39th GI-Jahrestagung","citation":{"ieee":"M. Volkamer, G. Schryen, L. Langer, A. Schmidt, and J. Buchmann, “Elektronische Wahlen: Verifizierung vs. Zertifizierung,” in <i>Workshop Elektronische Wahlen, elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>, 2009.","apa":"Volkamer, M., Schryen, G., Langer, L., Schmidt, A., &#38; Buchmann, J. (2009). Elektronische Wahlen: Verifizierung vs. Zertifizierung. In <i>Workshop Elektronische Wahlen, elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>.","short":"M. Volkamer, G. Schryen, L. Langer, A. Schmidt, J. Buchmann, in: Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung, 2009.","chicago":"Volkamer, Melanie, Guido Schryen, Lucie Langer, Axel Schmidt, and Johannes Buchmann. “Elektronische Wahlen: Verifizierung vs. Zertifizierung.” In <i>Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>, 2009.","mla":"Volkamer, Melanie, et al. “Elektronische Wahlen: Verifizierung vs. Zertifizierung.” <i>Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>, 2009.","bibtex":"@inproceedings{Volkamer_Schryen_Langer_Schmidt_Buchmann_2009, title={Elektronische Wahlen: Verifizierung vs. Zertifizierung}, booktitle={Workshop Elektronische Wahlen, elektronische Teilhabe, Societyware, 39th GI-Jahrestagung}, author={Volkamer, Melanie and Schryen, Guido and Langer, Lucie and Schmidt, Axel and Buchmann, Johannes}, year={2009} }","ama":"Volkamer M, Schryen G, Langer L, Schmidt A, Buchmann J. Elektronische Wahlen: Verifizierung vs. Zertifizierung. In: <i>Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>. ; 2009."},"extern":"1","abstract":[{"lang":"eng","text":"Der Beitrag diskutiert die kontroversen Ans{\\\"a}tze ? Verifizierung versus Evaluation/Zertifizierung ? zur Sicherung elektronischer Wahlen mit Wahlger{\\\"a}ten. Dabei spielt das Urteils des Bundesverfassungsgerichts [BVG099] eine zentrale Rolle. Hierin wird entschieden, dass die Zertifizierung des Wahlger{\\\"a}tes nicht ausreicht und es werden Verifizierungsfunktionen gefordert, die den W{\\\"a}hlern die M{\\\"o}glichkeit geben sich von der Integrit{\\\"a}t des Wahlergebnisses zu {\\\"u}berzeugen. Der Beitrag zeigt auf, dass auch mit der Implementierung entsprechender Verifizierungsfunktionen nicht auf Zertifizierung verzichtet werden kann, da an ein Wahlger{\\\"a}t auch andere Anforderungen wie etwa hinsichtlich des Wahlgeheimnisses gestellt werden. Es wird au{\\ss}erdem die Frage diskutiert, warum der Zertifizierung hinsichtlich dieser zus{\\\"a}tzlichen Anforderungen vertraut werden kann, w{\\\"a}hrend dies nicht der Fall bei der Integrit{\\\"a}tsanforderung ist."}],"file":[{"creator":"hsiemes","date_created":"2018-12-18T13:15:26Z","date_updated":"2018-12-18T13:15:26Z","relation":"main_file","file_size":60870,"access_level":"open_access","file_name":"Elektronische Wahlen - GI 2009.pdf","content_type":"application/pdf","file_id":"6313"}],"date_created":"2018-11-14T11:49:04Z","type":"conference","department":[{"_id":"277"}],"oa":"1"},{"oa":"1","citation":{"mla":"Schryen, Guido, and Eliot Rich. “Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland.” <i>IEEE Transactions on Information Forensics \\&#38; Security</i>, vol. 4, no. 4 Part, IEEE, 2009, pp. 729–44.","bibtex":"@article{Schryen_Rich_2009, title={Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland}, volume={4}, number={4 Part}, journal={IEEE Transactions on Information Forensics \\&#38; Security}, publisher={IEEE}, author={Schryen, Guido and Rich, Eliot}, year={2009}, pages={729–744} }","ama":"Schryen G, Rich E. Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland. <i>IEEE Transactions on Information Forensics \\&#38; Security</i>. 2009;4(4 Part):729-744.","ieee":"G. Schryen and E. Rich, “Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland,” <i>IEEE Transactions on Information Forensics \\&#38; Security</i>, vol. 4, no. 4 Part, pp. 729–744, 2009.","apa":"Schryen, G., &#38; Rich, E. (2009). Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland. <i>IEEE Transactions on Information Forensics \\&#38; Security</i>, <i>4</i>(4 Part), 729–744.","short":"G. Schryen, E. Rich, IEEE Transactions on Information Forensics \\&#38; Security 4 (2009) 729–744.","chicago":"Schryen, Guido, and Eliot Rich. “Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland.” <i>IEEE Transactions on Information Forensics \\&#38; Security</i> 4, no. 4 Part (2009): 729–44."},"file_date_updated":"2018-12-18T13:16:07Z","_id":"5621","publisher":"IEEE","page":"729-744","volume":4,"ddc":["000"],"user_id":"61579","status":"public","has_accepted_license":"1","date_created":"2018-11-14T14:06:44Z","file":[{"date_created":"2018-12-18T13:16:07Z","creator":"hsiemes","content_type":"application/pdf","file_id":"6316","access_level":"open_access","file_size":1544790,"file_name":"JOURNAL VERSION.pdf","date_updated":"2018-12-18T13:16:07Z","relation":"main_file"}],"department":[{"_id":"277"}],"type":"journal_article","keyword":["e-voting","Internet voting","Internet election","security","verifiability","RIES","Estonia","Neuch{\\^a}tel"],"publication":"IEEE Transactions on Information Forensics \\& Security","issue":"4 Part","abstract":[{"lang":"eng","text":"Remote voting through the Internet provides convenience and access to the electorate. At the same time, the security concerns facing any distributed application are magnified when the task is so crucial to democratic society. In addition, some of the electoral process loses transparency when it is encapsulated in information technology. In this paper, we examine the public record of three recent elections that used Internet voting. Our specific goal is to identify any potential flaws that security experts would recognize, but may have not been identified in the rush to implement technology. To do this, we present a multiple exploratory case study, looking at elections conducted between 2006 and 2007 in Estonia, Netherlands, and Switzerland. These elections were selected as particularly interesting and accessible, and each presents its own technical and security challenges. The electoral environment, technical design and process for each election are described, including reconstruction of details which are implied but not specified within the source material. We found that all three elections warrant significant concern about voter security, verifiability, and transparency. Usability, our fourth area of focus, seems to have been well-addressed in these elections. While our analysis is based on public documents and previously published reports, and therefore lacking access to any confidential materials held by electoral officials, this comparative analysis provides interesting insight and consistent questions across all these cases. Effective review of Internet voting requires an aggressive stance towards identifying potential security and operational flaws, and we encourage the use of third party reviews with critical technology skills during design, programming, and voting to reduce the changes of failure or fraud that would undermine public confidence."}],"extern":"1","language":[{"iso":"eng"}],"author":[{"full_name":"Schryen, Guido","last_name":"Schryen","first_name":"Guido","id":"72850"},{"first_name":"Eliot","last_name":"Rich","full_name":"Rich, Eliot"}],"title":"Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections in Estonia, The Netherlands, and Switzerland","year":"2009","intvolume":"         4","date_updated":"2022-01-06T07:02:12Z"},{"file":[{"creator":"hsiemes","date_created":"2018-12-18T13:14:09Z","file_size":456497,"access_level":"open_access","file_name":"ACM VERSION.pdf","date_updated":"2018-12-18T13:14:09Z","relation":"main_file","content_type":"application/pdf","file_id":"6310"}],"date_created":"2018-11-14T14:12:27Z","keyword":["Open source software","Closed source software","Security","Metrics"],"type":"conference","department":[{"_id":"277"}],"publication":"24th Annual ACM Symposium on Applied Computing","abstract":[{"lang":"eng","text":"The increasing availability and deployment of open source software in personal and commercial environments makes open source software highly appealing for hackers, and others who are interested in exploiting software vulnerabilities. This deployment has resulted in a debate ?full of religion? on the security of open source software compared to that of closed source software. However, beyond such arguments, only little quantitative analysis on this research issue has taken place. We discuss the state-of-the-art of the security debate and identify shortcomings. Based on these, we propose new metrics, which allows to answer the question to what extent the review process of open source and closed source development has helped to fix vulnerabilities. We illustrate the application of some of these metrics in a case study on OpenOffice (open source software) vs. Microsoft Office (closed source software)."}],"extern":"1","language":[{"iso":"eng"}],"title":"Open Source vs. Closed Source Software: Towards Measuring Security","year":"2009","author":[{"first_name":"Guido","last_name":"Schryen","full_name":"Schryen, Guido","id":"72850"},{"first_name":"Rouven","last_name":"Kadura","full_name":"Kadura, Rouven"}],"date_updated":"2022-01-06T07:02:13Z","oa":"1","file_date_updated":"2018-12-18T13:14:09Z","citation":{"ieee":"G. Schryen and R. Kadura, “Open Source vs. Closed Source Software: Towards Measuring Security,” in <i>24th Annual ACM Symposium on Applied Computing</i>, 2009.","apa":"Schryen, G., &#38; Kadura, R. (2009). Open Source vs. Closed Source Software: Towards Measuring Security. In <i>24th Annual ACM Symposium on Applied Computing</i>.","chicago":"Schryen, Guido, and Rouven Kadura. “Open Source vs. Closed Source Software: Towards Measuring Security.” In <i>24th Annual ACM Symposium on Applied Computing</i>, 2009.","short":"G. Schryen, R. Kadura, in: 24th Annual ACM Symposium on Applied Computing, 2009.","mla":"Schryen, Guido, and Rouven Kadura. “Open Source vs. Closed Source Software: Towards Measuring Security.” <i>24th Annual ACM Symposium on Applied Computing</i>, 2009.","bibtex":"@inproceedings{Schryen_Kadura_2009, title={Open Source vs. Closed Source Software: Towards Measuring Security}, booktitle={24th Annual ACM Symposium on Applied Computing}, author={Schryen, Guido and Kadura, Rouven}, year={2009} }","ama":"Schryen G, Kadura R. Open Source vs. Closed Source Software: Towards Measuring Security. In: <i>24th Annual ACM Symposium on Applied Computing</i>. ; 2009."},"_id":"5625","ddc":["000"],"user_id":"61579","status":"public","has_accepted_license":"1"},{"language":[{"iso":"eng"}],"_id":"5646","user_id":"61579","ddc":["000"],"author":[{"id":"72850","last_name":"Schryen","first_name":"Guido","full_name":"Schryen, Guido"}],"year":"2009","title":"A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors","status":"public","has_accepted_license":"1","date_updated":"2022-01-06T07:02:19Z","date_created":"2018-11-14T14:40:04Z","file":[{"access_level":"open_access","file_size":594302,"file_name":"Conference Version.pdf","date_updated":"2018-12-18T13:14:48Z","relation":"main_file","content_type":"application/pdf","file_id":"6311","creator":"hsiemes","date_created":"2018-12-18T13:14:48Z"}],"department":[{"_id":"277"}],"oa":"1","type":"conference","citation":{"short":"G. Schryen, in: 5th International Conference on IT Security Incident Management \\&#38; IT Forensics, 2009.","chicago":"Schryen, Guido. “A Comprehensive and Comparative Analysis of the Patching Behavior of Open Source and Closed Source Software Vendors.” In <i>5th International Conference on IT Security Incident Management \\&#38; IT Forensics</i>, 2009.","ieee":"G. Schryen, “A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors,” in <i>5th International Conference on IT Security Incident Management \\&#38; IT Forensics</i>, 2009.","apa":"Schryen, G. (2009). A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors. In <i>5th International Conference on IT Security Incident Management \\&#38; IT Forensics</i>.","bibtex":"@inproceedings{Schryen_2009, title={A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors}, booktitle={5th International Conference on IT Security Incident Management \\&#38; IT Forensics}, author={Schryen, Guido}, year={2009} }","ama":"Schryen G. A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors. In: <i>5th International Conference on IT Security Incident Management \\&#38; IT Forensics</i>. ; 2009.","mla":"Schryen, Guido. “A Comprehensive and Comparative Analysis of the Patching Behavior of Open Source and Closed Source Software Vendors.” <i>5th International Conference on IT Security Incident Management \\&#38; IT Forensics</i>, 2009."},"file_date_updated":"2018-12-18T13:14:48Z","publication":"5th International Conference on IT Security Incident Management \\& IT Forensics","extern":"1","abstract":[{"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 is still weak. Addressing this research gap, this paper presents a comprehensive empirical investigation of the patching behavior of software vendors/communities of widely deployed open source and closed source software packages, including operating systems, database systems, web browsers, email clients, and office systems. As the value of any empirical study relies on the quality of data available, this paper also discusses in detail data issues, explains to what extent the empirical analysis can be based on vulnerability data contained in the NIST National Vulnerability Database, and shows how data on vulnerability patches was collected by the author to support this study. The results of the analysis suggest that it is not the particular software development style that determines patching behavior, but rather the policy of the particular software vendor.","lang":"eng"}]},{"date_updated":"2022-01-06T07:02:19Z","title":"Security of open source and closed source software: An empirical comparison of published vulnerabilities","year":"2009","author":[{"last_name":"Schryen","first_name":"Guido","full_name":"Schryen, Guido","id":"72850"}],"language":[{"iso":"eng"}],"extern":"1","abstract":[{"text":"Reviewing literature on open source and closed source security reveals that the discussion is often determined by biased attitudes toward one of these development styles. The discussion specifically lacks appropriate metrics, methodology and hard data. This paper contributes to solving this problem by analyzing and comparing published vulnerabilities of eight open source software and nine closed source software packages, all of which are widely deployed. Thereby, it provides an extensive empirical analysis of vulnerabilities in terms of mean time between vulnerability disclosures, the development of disclosure over time, and the severity of vulnerabilities, and allows for validating models provided in the literature. The investigation reveals that (a) the mean time between vulnerability disclosures was lower for open source software in half of the cases, while the other cases show no differences, (b) in contrast to literature assumption, 14 out of 17 software packages showed a significant linear or piecewise linear correlation between time and the number of published vulnerabilities, and (c) regarding the severity of vulnerabilities, no significant differences were found between open source and closed source.","lang":"eng"}],"publication":"15th Americas Conference on Information Systems","type":"conference","keyword":["Vulnerabilities","security","open source software","closed source software","empirical comparison"],"department":[{"_id":"277"}],"file":[{"creator":"hsiemes","date_created":"2018-12-18T13:16:39Z","file_size":483690,"access_level":"open_access","file_name":"Security of Open Source and Closed Source Software An Empirical - AMCIS Version.pdf","date_updated":"2018-12-18T13:16:39Z","relation":"main_file","content_type":"application/pdf","file_id":"6317"}],"date_created":"2018-11-14T14:41:24Z","has_accepted_license":"1","status":"public","user_id":"61579","ddc":["000"],"_id":"5647","file_date_updated":"2018-12-18T13:16:39Z","citation":{"mla":"Schryen, Guido. “Security of Open Source and Closed Source Software: An Empirical Comparison of Published Vulnerabilities.” <i>15th Americas Conference on Information Systems</i>, 2009.","bibtex":"@inproceedings{Schryen_2009, title={Security of open source and closed source software: An empirical comparison of published vulnerabilities}, booktitle={15th Americas Conference on Information Systems}, author={Schryen, Guido}, year={2009} }","ama":"Schryen G. Security of open source and closed source software: An empirical comparison of published vulnerabilities. In: <i>15th Americas Conference on Information Systems</i>. ; 2009.","ieee":"G. Schryen, “Security of open source and closed source software: An empirical comparison of published vulnerabilities,” in <i>15th Americas Conference on Information Systems</i>, 2009.","apa":"Schryen, G. (2009). Security of open source and closed source software: An empirical comparison of published vulnerabilities. In <i>15th Americas Conference on Information Systems</i>.","short":"G. Schryen, in: 15th Americas Conference on Information Systems, 2009.","chicago":"Schryen, Guido. “Security of Open Source and Closed Source Software: An Empirical Comparison of Published Vulnerabilities.” In <i>15th Americas Conference on Information Systems</i>, 2009."},"oa":"1"}]