---
_id: '18560'
abstract:
- lang: eng
  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.
article_number: '054434'
article_type: original
author:
- first_name: Ersoy
  full_name: Şaşıoğlu, Ersoy
  last_name: Şaşıoğlu
- first_name: Arno
  full_name: Schindlmayr, Arno
  id: '458'
  last_name: Schindlmayr
  orcid: 0000-0002-4855-071X
- first_name: Christoph
  full_name: Friedrich, Christoph
  last_name: Friedrich
- first_name: Frank
  full_name: Freimuth, Frank
  last_name: Freimuth
- first_name: Stefan
  full_name: Blügel, Stefan
  last_name: Blügel
citation:
  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>
  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>
  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>.
  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>.'
  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>.
  short: E. Şaşıoğlu, A. Schindlmayr, C. Friedrich, F. Freimuth, S. Blügel, Physical
    Review B 81 (2010).
date_created: 2020-08-28T11:31:26Z
date_updated: 2025-12-16T11:09:51Z
ddc:
- '530'
department:
- _id: '296'
- _id: '35'
- _id: '15'
- _id: '170'
- _id: '230'
doi: 10.1103/PhysRevB.81.054434
external_id:
  arxiv:
  - '1002.4897'
  isi:
  - '000274998000084'
file:
- access_level: open_access
  content_type: application/pdf
  creator: schindlm
  date_created: 2020-08-28T11:33:17Z
  date_updated: 2020-08-30T15:06:10Z
  description: © 2010 American Physical Society
  file_id: '18561'
  file_name: PhysRevB.81.054434.pdf
  file_size: 711970
  relation: main_file
  title: Wannier-function approach to spin excitations in solids
file_date_updated: 2020-08-30T15:06:10Z
has_accepted_license: '1'
intvolume: '        81'
isi: '1'
issue: '5'
language:
- iso: eng
oa: '1'
publication: Physical Review B
publication_identifier:
  eissn:
  - 1550-235X
  issn:
  - 1098-0121
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Wannier-function approach to spin excitations in solids
type: journal_article
user_id: '16199'
volume: 81
year: '2010'
...
---
_id: '4167'
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 \x02H(\x03, ϕ) and electric field \x02E(\x03,
    ϕ) are proportional to ∝ \x03(t−1) for \x03 → 0. The variable \x03 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."
article_number: '11515155 '
author:
- first_name: C
  full_name: Classen, C
  last_name: Classen
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: R
  full_name: Schuhmann, R
  last_name: Schuhmann
citation:
  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>'
  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>
  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} }'
  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>.
  short: 'C. Classen, J. Förstner, T. Meier, R. Schuhmann, in: 2010 IEEE Antennas
    and Propagation Society International Symposium, IEEE, 2010.'
conference:
  end_date: 2010-07-17
  location: Toronto, ON, Canada
  name: 2010 IEEE international Symposium Antennas
  start_date: 2010-07-11
date_created: 2018-08-28T08:34:52Z
date_updated: 2025-12-16T12:35:39Z
ddc:
- '530'
department:
- _id: '61'
- _id: '15'
- _id: '293'
- _id: '170'
- _id: '230'
- _id: '35'
- _id: '34'
doi: 10.1109/aps.2010.5562017
file:
- access_level: open_access
  content_type: application/pdf
  creator: hclaudia
  date_created: 2018-08-28T08:36:44Z
  date_updated: 2018-09-04T19:31:42Z
  file_id: '4168'
  file_name: 2010 Classen,Förstner, Meier T,Schuhmann_Enhanced FDTD edge correction
    for nonlinear effects calculation.pdf
  file_size: 209412
  relation: main_file
file_date_updated: 2018-09-04T19:31:42Z
has_accepted_license: '1'
keyword:
- tet_topic_numerics
language:
- iso: eng
oa: '1'
publication: 2010 IEEE Antennas and Propagation Society International Symposium
publication_identifier:
  isbn:
  - '9781424449675'
  - '9781424449682'
publication_status: published
publisher: IEEE
status: public
title: Enhanced FDTD edge correction for nonlinear effects calculation
type: conference
urn: '41677'
user_id: '16199'
year: '2010'
...
---
_id: '4172'
abstract:
- lang: eng
  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."
article_number: '7946'
article_type: original
author:
- first_name: Karoline A.
  full_name: Piegdon, Karoline A.
  last_name: Piegdon
- first_name: Stefan
  full_name: Declair, Stefan
  last_name: Declair
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: Heiner
  full_name: Matthias, Heiner
  last_name: Matthias
- first_name: Martin
  full_name: Urbanski, Martin
  last_name: Urbanski
- first_name: Heinz-Siegfried
  full_name: Kitzerow, Heinz-Siegfried
  id: '254'
  last_name: Kitzerow
- first_name: Dirk
  full_name: Reuter, Dirk
  id: '37763'
  last_name: Reuter
- first_name: Andreas D.
  full_name: Wieck, Andreas D.
  last_name: Wieck
- first_name: Axel
  full_name: Lorke, Axel
  last_name: Lorke
- first_name: Cedrik
  full_name: Meier, Cedrik
  id: '20798'
  last_name: Meier
  orcid: https://orcid.org/0000-0002-3787-3572
citation:
  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>
  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>
  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} }'
  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>.
  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>.'
  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>.
  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).
date_created: 2018-08-28T08:50:06Z
date_updated: 2025-12-16T16:44:44Z
ddc:
- '530'
department:
- _id: '15'
- _id: '287'
- _id: '293'
- _id: '292'
- _id: '35'
- _id: '230'
- _id: '313'
- _id: '170'
- _id: '27'
- _id: '34'
- _id: '61'
doi: 10.1364/oe.18.007946
file:
- access_level: open_access
  content_type: application/pdf
  creator: hclaudia
  date_created: 2018-08-28T08:52:50Z
  date_updated: 2018-09-04T20:02:01Z
  file_id: '4173'
  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
  file_size: 627755
  relation: main_file
file_date_updated: 2018-09-04T20:02:01Z
has_accepted_license: '1'
intvolume: '        18'
issue: '8'
keyword:
- tet_topic_qd
- tet_topic_microdisk
language:
- iso: eng
oa: '1'
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'
publication: Optics Express
publication_identifier:
  issn:
  - 1094-4087
publication_status: published
publisher: The Optical Society
status: public
title: Tuning quantum-dot based photonic devices with liquid crystals
type: journal_article
urn: '41725'
user_id: '16199'
volume: 18
year: '2010'
...
---
_id: '24065'
author:
- first_name: Jens
  full_name: Pottebaum, Jens
  id: '405'
  last_name: Pottebaum
  orcid: http://orcid.org/0000-0001-8778-2989
- first_name: Anna Maria
  full_name: Japs, Anna Maria
  last_name: Japs
- first_name: Stephan
  full_name: Prödel, Stephan
  last_name: Prödel
- first_name: Rainer
  full_name: Koch, Rainer
  last_name: Koch
citation:
  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.'
  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>.
  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} }'
  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.
  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.
  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.
  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.'
date_created: 2021-09-09T12:27:14Z
date_updated: 2026-03-31T03:52:00Z
editor:
- first_name: Simon
  full_name: French, Simon
  last_name: French
- first_name: Brian
  full_name: Tomaszewski, Brian
  last_name: Tomaszewski
- first_name: Chris
  full_name: Zobel, Chris
  last_name: Zobel
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
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://idl.iscram.org/files/pottebaum/2010/847_Pottebaum_etal2010.pdf
oa: '1'
place: Seattle, WA
publication: ISCRAM 2010 -- 7th International Conference on Information Systems for
  Crisis Response and Management
quality_controlled: '1'
status: public
title: Design and modeling of a domain ontology for fire protection
type: conference
user_id: '405'
year: '2010'
...
---
_id: '30778'
author:
- first_name: Harry
  full_name: Kullmann, Harry
  id: '77972'
  last_name: Kullmann
  orcid: 0000-0001-5488-5105
citation:
  ama: Kullmann H. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des
    naturwissenschaftlichen Unterrichts an Gymnasien</i>. Vol Band 26. Waxmann; 2010.
  apa: 'Kullmann, H. (2010). <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel
    des naturwissenschaftlichen Unterrichts an Gymnasien: Vol. Band 26</i>. Waxmann.'
  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} }'
  chicago: 'Kullmann, Harry. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel
    des naturwissenschaftlichen Unterrichts an Gymnasien</i>. Vol. Band 26. Empirische
    Erziehungswissenschaft. Münster: Waxmann, 2010.'
  ieee: 'H. Kullmann, <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel
    des naturwissenschaftlichen Unterrichts an Gymnasien</i>, vol. Band 26. Münster:
    Waxmann, 2010.'
  mla: Kullmann, Harry. <i>Lehrerkooperation – Ausprägung und Wirkungen am Beispiel
    des naturwissenschaftlichen Unterrichts an Gymnasien</i>. Waxmann, 2010.
  short: H. Kullmann, Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des
    naturwissenschaftlichen Unterrichts an Gymnasien, Waxmann, Münster, 2010.
date_created: 2022-04-05T10:34:02Z
date_updated: 2026-08-22T13:31:12Z
department:
- _id: '556'
keyword:
- Beispiel
- Gymnasium
- Kooperation
- Lehrerkooperation
- Unterricht
language:
- iso: ger
main_file_link:
- open_access: '1'
  url: https://d-nb.info/1235068307/34
oa: '1'
place: Münster
publication_identifier:
  isbn:
  - '978383092396'
publication_status: published
publisher: Waxmann
quality_controlled: '1'
series_title: Empirische Erziehungswissenschaft
status: public
title: Lehrerkooperation – Ausprägung und Wirkungen am Beispiel des naturwissenschaftlichen
  Unterrichts an Gymnasien
type: book
user_id: '105186'
volume: Band 26
year: '2010'
...
---
_id: '2896'
author:
- first_name: Gennadij
  full_name: Liske, Gennadij
  last_name: Liske
citation:
  ama: Liske G. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>.;
    2009.
  apa: Liske, G. (2009). <i>Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens</i>.
  bibtex: '@book{Liske_2009, title={Analyse und Evaluation eines identitätsbasierten
    Signcryption-Verfahrens}, author={Liske, Gennadij}, year={2009} }'
  chicago: Liske, Gennadij. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>,
    2009.
  ieee: G. Liske, <i>Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens</i>.
    2009.
  mla: Liske, Gennadij. <i>Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens</i>.
    2009.
  short: G. Liske, Analyse Und Evaluation Eines Identitätsbasierten Signcryption-Verfahrens,
    2009.
date_created: 2018-05-25T09:31:04Z
date_updated: 2022-01-06T06:58:42Z
ddc:
- '000'
department:
- _id: '64'
file:
- access_level: open_access
  content_type: application/pdf
  creator: feidens
  date_created: 2018-05-25T09:30:58Z
  date_updated: 2018-07-12T09:41:46Z
  file_id: '2897'
  file_name: 2009_Liske_AnalyseUndEvaluationEinesIdentitaetsbasiertenSigncryptionVerfahrens.pdf
  file_size: 1196648
  relation: main_file
file_date_updated: 2018-07-12T09:41:46Z
has_accepted_license: '1'
oa: '1'
status: public
supervisor:
- first_name: Johannes
  full_name: Blömer, Johannes
  last_name: Blömer
title: Analyse und Evaluation eines identitätsbasierten Signcryption-Verfahrens
type: bachelorsthesis
urn: '28960'
user_id: '25078'
year: '2009'
...
---
_id: '1930'
author:
- first_name: Riko
  full_name: Jacob, Riko
  last_name: Jacob
- first_name: Stephan
  full_name: Ritscher, Stephan
  last_name: Ritscher
- first_name: Christian
  full_name: Scheideler, Christian
  id: '20792'
  last_name: Scheideler
- first_name: Stefan
  full_name: Schmid, Stefan
  last_name: Schmid
citation:
  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>'
  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>
  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} }'
  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>.
  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.
  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>.
  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.'
date_created: 2018-03-29T09:12:59Z
date_updated: 2022-01-06T06:54:02Z
ddc:
- '040'
department:
- _id: '79'
doi: 10.1007/978-3-642-10631-6_78
file:
- access_level: open_access
  content_type: application/pdf
  creator: florida
  date_created: 2018-04-13T10:05:53Z
  date_updated: 2018-04-13T10:05:53Z
  file_id: '2342'
  file_name: isaac09.pdf
  file_size: 139275
  relation: main_file
file_date_updated: 2018-04-13T10:05:53Z
has_accepted_license: '1'
intvolume: '      5878'
oa: '1'
page: 771--780
publication: Algorithms and Computation, 20th International Symposium, ISAAC 2009,
  Honolulu, Hawaii, USA, December 16-18, 2009. Proceedings
publisher: Springer
series_title: Lecture Notes in Computer Science
status: public
title: A Self-stabilizing and Local Delaunay Graph Construction
type: conference
urn: '19304'
user_id: '15504'
volume: 5878
year: '2009'
...
---
_id: '4182'
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."
article_number: '042331'
article_type: original
author:
- first_name: A.
  full_name: Grodecka, A.
  last_name: Grodecka
- first_name: P.
  full_name: Machnikowski, P.
  last_name: Machnikowski
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
citation:
  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>
  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}
    }'
  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>.
  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.
  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>.
  short: A. Grodecka, P. Machnikowski, J. Förstner, Physical Review A 79 (2009).
date_created: 2018-08-28T09:32:32Z
date_updated: 2022-01-06T07:00:31Z
ddc:
- '530'
department:
- _id: '15'
doi: 10.1103/physreva.79.042331
file:
- access_level: open_access
  content_type: application/pdf
  creator: hclaudia
  date_created: 2018-08-28T09:33:22Z
  date_updated: 2018-09-04T19:36:35Z
  file_id: '4183'
  file_name: 2009 Grodecka,Machnikowski,Förstner_Indirect spin dephasing via charge-state
    decoherence in optical control schemes in quantum dots.pdf
  file_size: 192120
  relation: main_file
file_date_updated: 2018-09-04T19:36:35Z
has_accepted_license: '1'
intvolume: '        79'
issue: '4'
keyword:
- tet_topic_qd
language:
- iso: eng
oa: '1'
publication: Physical Review A
publication_identifier:
  issn:
  - 1050-2947
  - 1094-1622
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Indirect spin dephasing via charge-state decoherence in optical control schemes
  in quantum dots
type: journal_article
urn: '41826'
user_id: '158'
volume: 79
year: '2009'
...
---
_id: '5597'
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.
author:
- first_name: Melanie
  full_name: Volkamer, Melanie
  last_name: Volkamer
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
- first_name: Lucie
  full_name: Langer, Lucie
  last_name: Langer
- first_name: Axel
  full_name: Schmidt, Axel
  last_name: Schmidt
- first_name: Johannes
  full_name: Buchmann, Johannes
  last_name: Buchmann
citation:
  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.'
  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>.'
  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} }'
  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.'
  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.'
  mla: 'Volkamer, Melanie, et al. “Elektronische Wahlen: Verifizierung vs. Zertifizierung.”
    <i>Workshop Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung</i>,
    2009.'
  short: 'M. Volkamer, G. Schryen, L. Langer, A. Schmidt, J. Buchmann, in: Workshop
    Elektronische Wahlen, Elektronische Teilhabe, Societyware, 39th GI-Jahrestagung,
    2009.'
date_created: 2018-11-14T11:49:04Z
date_updated: 2022-01-06T07:02:05Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-18T13:15:26Z
  date_updated: 2018-12-18T13:15:26Z
  file_id: '6313'
  file_name: Elektronische Wahlen - GI 2009.pdf
  file_size: 60870
  relation: main_file
file_date_updated: 2018-12-18T13:15:26Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
publication: Workshop Elektronische Wahlen, elektronische Teilhabe, Societyware, 39th
  GI-Jahrestagung
status: public
title: 'Elektronische Wahlen: Verifizierung vs. Zertifizierung'
type: conference
user_id: '61579'
year: '2009'
...
---
_id: '5621'
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.
author:
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
- first_name: Eliot
  full_name: Rich, Eliot
  last_name: Rich
citation:
  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.'
  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.'
  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} }'
  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.'
  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.'
  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.'
  short: G. Schryen, E. Rich, IEEE Transactions on Information Forensics \&#38; Security
    4 (2009) 729–744.
date_created: 2018-11-14T14:06:44Z
date_updated: 2022-01-06T07:02:12Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-18T13:16:07Z
  date_updated: 2018-12-18T13:16:07Z
  file_id: '6316'
  file_name: JOURNAL VERSION.pdf
  file_size: 1544790
  relation: main_file
file_date_updated: 2018-12-18T13:16:07Z
has_accepted_license: '1'
intvolume: '         4'
issue: 4 Part
keyword:
- e-voting
- Internet voting
- Internet election
- security
- verifiability
- RIES
- Estonia
- Neuch{\^a}tel
language:
- iso: eng
oa: '1'
page: 729-744
publication: IEEE Transactions on Information Forensics \& Security
publisher: IEEE
status: public
title: 'Security in Large-Scale Internet Elections: A Retrospective Analysis of Elections
  in Estonia, The Netherlands, and Switzerland'
type: journal_article
user_id: '61579'
volume: 4
year: '2009'
...
---
_id: '5625'
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).
author:
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
- first_name: Rouven
  full_name: Kadura, Rouven
  last_name: Kadura
citation:
  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.'
  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>.'
  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} }'
  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.'
  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.'
  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.'
  short: 'G. Schryen, R. Kadura, in: 24th Annual ACM Symposium on Applied Computing,
    2009.'
date_created: 2018-11-14T14:12:27Z
date_updated: 2022-01-06T07:02:13Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-18T13:14:09Z
  date_updated: 2018-12-18T13:14:09Z
  file_id: '6310'
  file_name: ACM VERSION.pdf
  file_size: 456497
  relation: main_file
file_date_updated: 2018-12-18T13:14:09Z
has_accepted_license: '1'
keyword:
- Open source software
- Closed source software
- Security
- Metrics
language:
- iso: eng
oa: '1'
publication: 24th Annual ACM Symposium on Applied Computing
status: public
title: 'Open Source vs. Closed Source Software: Towards Measuring Security'
type: conference
user_id: '61579'
year: '2009'
...
---
_id: '5646'
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 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.
author:
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
citation:
  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.'
  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} }'
  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.
  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.
  short: 'G. Schryen, in: 5th International Conference on IT Security Incident Management
    \&#38; IT Forensics, 2009.'
date_created: 2018-11-14T14:40:04Z
date_updated: 2022-01-06T07:02:19Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-18T13:14:48Z
  date_updated: 2018-12-18T13:14:48Z
  file_id: '6311'
  file_name: Conference Version.pdf
  file_size: 594302
  relation: main_file
file_date_updated: 2018-12-18T13:14:48Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
publication: 5th International Conference on IT Security Incident Management \& IT
  Forensics
status: public
title: A comprehensive and comparative analysis of the patching behavior of open source
  and closed source software vendors
type: conference
user_id: '61579'
year: '2009'
...
---
_id: '5647'
abstract:
- lang: eng
  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.
author:
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
citation:
  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.'
  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>.'
  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}
    }'
  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.'
  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.'
  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.'
  short: 'G. Schryen, in: 15th Americas Conference on Information Systems, 2009.'
date_created: 2018-11-14T14:41:24Z
date_updated: 2022-01-06T07:02:19Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-18T13:16:39Z
  date_updated: 2018-12-18T13:16:39Z
  file_id: '6317'
  file_name: Security of Open Source and Closed Source Software An Empirical - AMCIS
    Version.pdf
  file_size: 483690
  relation: main_file
file_date_updated: 2018-12-18T13:16:39Z
has_accepted_license: '1'
keyword:
- Vulnerabilities
- security
- open source software
- closed source software
- empirical comparison
language:
- iso: eng
oa: '1'
publication: 15th Americas Conference on Information Systems
status: public
title: 'Security of open source and closed source software: An empirical comparison
  of published vulnerabilities'
type: conference
user_id: '61579'
year: '2009'
...
---
_id: '11723'
abstract:
- lang: eng
  text: In this paper we present a novel vehicle tracking algorithm, which is based
    on multi-level sensor fusion of GPS (global positioning system) with Inertial
    Measurement Unit sensor data. It is shown that the robustness of the system to
    temporary dropouts of the GPS signal, which may occur due to limited visibility
    of satellites in narrow street canyons or tunnels, is greatly improved by sensor
    fusion. We further demonstrate how the observation and state noise covariances
    of the employed Kalman filters can be estimated alongside the filtering by an
    application of the Expectation-Maximization algorithm. The proposed time-variant
    multi-level Kalman filter is shown to outperform an Interacting Multiple Model
    approach while at the same time being computationally less demanding.
author:
- first_name: Maik
  full_name: Bevermeier, Maik
  last_name: Bevermeier
- first_name: Sven
  full_name: Peschke, Sven
  last_name: Peschke
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Bevermeier M, Peschke S, Haeb-Umbach R. Robust vehicle localization based
    on multi-level sensor fusion and online parameter estimation. In: <i>6th Workshop
    on Positioning Navigation and Communication (WPNC 2009)</i>. ; 2009:235-242. doi:<a
    href="https://doi.org/10.1109/WPNC.2009.4907833">10.1109/WPNC.2009.4907833</a>'
  apa: Bevermeier, M., Peschke, S., &#38; Haeb-Umbach, R. (2009). Robust vehicle localization
    based on multi-level sensor fusion and online parameter estimation. In <i>6th
    Workshop on Positioning Navigation and Communication (WPNC 2009)</i> (pp. 235–242).
    <a href="https://doi.org/10.1109/WPNC.2009.4907833">https://doi.org/10.1109/WPNC.2009.4907833</a>
  bibtex: '@inproceedings{Bevermeier_Peschke_Haeb-Umbach_2009, title={Robust vehicle
    localization based on multi-level sensor fusion and online parameter estimation},
    DOI={<a href="https://doi.org/10.1109/WPNC.2009.4907833">10.1109/WPNC.2009.4907833</a>},
    booktitle={6th Workshop on Positioning Navigation and Communication (WPNC 2009)},
    author={Bevermeier, Maik and Peschke, Sven and Haeb-Umbach, Reinhold}, year={2009},
    pages={235–242} }'
  chicago: Bevermeier, Maik, Sven Peschke, and Reinhold Haeb-Umbach. “Robust Vehicle
    Localization Based on Multi-Level Sensor Fusion and Online Parameter Estimation.”
    In <i>6th Workshop on Positioning Navigation and Communication (WPNC 2009)</i>,
    235–42, 2009. <a href="https://doi.org/10.1109/WPNC.2009.4907833">https://doi.org/10.1109/WPNC.2009.4907833</a>.
  ieee: M. Bevermeier, S. Peschke, and R. Haeb-Umbach, “Robust vehicle localization
    based on multi-level sensor fusion and online parameter estimation,” in <i>6th
    Workshop on Positioning Navigation and Communication (WPNC 2009)</i>, 2009, pp.
    235–242.
  mla: Bevermeier, Maik, et al. “Robust Vehicle Localization Based on Multi-Level
    Sensor Fusion and Online Parameter Estimation.” <i>6th Workshop on Positioning
    Navigation and Communication (WPNC 2009)</i>, 2009, pp. 235–42, doi:<a href="https://doi.org/10.1109/WPNC.2009.4907833">10.1109/WPNC.2009.4907833</a>.
  short: 'M. Bevermeier, S. Peschke, R. Haeb-Umbach, in: 6th Workshop on Positioning
    Navigation and Communication (WPNC 2009), 2009, pp. 235–242.'
date_created: 2019-07-12T05:27:01Z
date_updated: 2022-01-06T06:51:07Z
department:
- _id: '54'
doi: 10.1109/WPNC.2009.4907833
keyword:
- covariance matrices
- expectation-maximisation algorithm
- expectation-maximization algorithm
- global positioning system
- Global Positioning System
- GPS
- inertial measurement unit
- interacting multiple model approach
- Kalman filters
- multilevel sensor fusion
- narrow street canyons
- narrow tunnels
- online parameter estimation
- parameter estimation
- road vehicles
- robust vehicle localization
- sensor fusion
- state noise covariances
- time-variant multilevel Kalman filter
- vehicle tracking algorithm
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/BePeHa09.pdf
oa: '1'
page: 235-242
publication: 6th Workshop on Positioning Navigation and Communication (WPNC 2009)
status: public
title: Robust vehicle localization based on multi-level sensor fusion and online parameter
  estimation
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11724'
abstract:
- lang: eng
  text: In this paper we present a novel vehicle tracking method which is based on
    multi-stage Kalman filtering of GPS and IMU sensor data. After individual Kalman
    filtering of GPS and IMU measurements the estimates of the orientation of the
    vehicle are combined in an optimal manner to improve the robustness towards drift
    errors. The tracking algorithm incorporates the estimation of time-variant covariance
    parameters by using an iterative block Expectation-Maximization algorithm to account
    for time-variant driving conditions and measurement quality. The proposed system
    is compared to an interacting multiple model approach (IMM) and achieves improved
    localization accuracy at lower computational complexity. Furthermore we show how
    the joint parameter estimation and localizaiton can be conducted with streaming
    input data to be able to track vehicles in a real driving environment.
author:
- first_name: Maik
  full_name: Bevermeier, Maik
  last_name: Bevermeier
- first_name: Sven
  full_name: Peschke, Sven
  last_name: Peschke
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Bevermeier M, Peschke S, Haeb-Umbach R. Joint Parameter Estimation and Tracking
    in a Multi-Stage Kalman Filter for Vehicle Positioning. In: <i>IEEE 69th Vehicular
    Technology Conference (VTC 2009 Spring)</i>. ; 2009:1-5. doi:<a href="https://doi.org/10.1109/VETECS.2009.5073634">10.1109/VETECS.2009.5073634</a>'
  apa: Bevermeier, M., Peschke, S., &#38; Haeb-Umbach, R. (2009). Joint Parameter
    Estimation and Tracking in a Multi-Stage Kalman Filter for Vehicle Positioning.
    In <i>IEEE 69th Vehicular Technology Conference (VTC 2009 Spring)</i> (pp. 1–5).
    <a href="https://doi.org/10.1109/VETECS.2009.5073634">https://doi.org/10.1109/VETECS.2009.5073634</a>
  bibtex: '@inproceedings{Bevermeier_Peschke_Haeb-Umbach_2009, title={Joint Parameter
    Estimation and Tracking in a Multi-Stage Kalman Filter for Vehicle Positioning},
    DOI={<a href="https://doi.org/10.1109/VETECS.2009.5073634">10.1109/VETECS.2009.5073634</a>},
    booktitle={IEEE 69th Vehicular Technology Conference (VTC 2009 Spring)}, author={Bevermeier,
    Maik and Peschke, Sven and Haeb-Umbach, Reinhold}, year={2009}, pages={1–5} }'
  chicago: Bevermeier, Maik, Sven Peschke, and Reinhold Haeb-Umbach. “Joint Parameter
    Estimation and Tracking in a Multi-Stage Kalman Filter for Vehicle Positioning.”
    In <i>IEEE 69th Vehicular Technology Conference (VTC 2009 Spring)</i>, 1–5, 2009.
    <a href="https://doi.org/10.1109/VETECS.2009.5073634">https://doi.org/10.1109/VETECS.2009.5073634</a>.
  ieee: M. Bevermeier, S. Peschke, and R. Haeb-Umbach, “Joint Parameter Estimation
    and Tracking in a Multi-Stage Kalman Filter for Vehicle Positioning,” in <i>IEEE
    69th Vehicular Technology Conference (VTC 2009 Spring)</i>, 2009, pp. 1–5.
  mla: Bevermeier, Maik, et al. “Joint Parameter Estimation and Tracking in a Multi-Stage
    Kalman Filter for Vehicle Positioning.” <i>IEEE 69th Vehicular Technology Conference
    (VTC 2009 Spring)</i>, 2009, pp. 1–5, doi:<a href="https://doi.org/10.1109/VETECS.2009.5073634">10.1109/VETECS.2009.5073634</a>.
  short: 'M. Bevermeier, S. Peschke, R. Haeb-Umbach, in: IEEE 69th Vehicular Technology
    Conference (VTC 2009 Spring), 2009, pp. 1–5.'
date_created: 2019-07-12T05:27:02Z
date_updated: 2022-01-06T06:51:07Z
department:
- _id: '54'
doi: 10.1109/VETECS.2009.5073634
keyword:
- computational complexity
- expectation-maximisation algorithm
- Global Positioning System
- inertial measurement unit
- inertial navigation
- interacting multiple model
- iterative block expectation-maximization algorithm
- Kalman filters
- multi-stage Kalman filter
- parameter estimation
- road vehicles
- vehicle positioning
- vehicle tracking
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/BePeHa09-1.pdf
oa: '1'
page: 1-5
publication: IEEE 69th Vehicular Technology Conference (VTC 2009 Spring)
status: public
title: Joint Parameter Estimation and Tracking in a Multi-Stage Kalman Filter for
  Vehicle Positioning
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11725'
author:
- first_name: Maik
  full_name: Bevermeier, Maik
  last_name: Bevermeier
- first_name: Sven
  full_name: Peschke, Sven
  last_name: Peschke
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Bevermeier M, Peschke S, Haeb-Umbach R. Eine Plattform fuer Mehrwertdienste
    im Bereich Logistik - Drahtlose Fahrzeug- und Laderaumueberwachung fuer LKW mit
    Hilfe einer Maut-On-Board Unit. In: <i>DGON Navigationskonvent 2009</i>. ; 2009.'
  apa: Bevermeier, M., Peschke, S., &#38; Haeb-Umbach, R. (2009). Eine Plattform fuer
    Mehrwertdienste im Bereich Logistik - Drahtlose Fahrzeug- und Laderaumueberwachung
    fuer LKW mit Hilfe einer Maut-On-Board Unit. In <i>DGON Navigationskonvent 2009</i>.
  bibtex: '@inproceedings{Bevermeier_Peschke_Haeb-Umbach_2009, title={Eine Plattform
    fuer Mehrwertdienste im Bereich Logistik - Drahtlose Fahrzeug- und Laderaumueberwachung
    fuer LKW mit Hilfe einer Maut-On-Board Unit}, booktitle={DGON Navigationskonvent
    2009}, author={Bevermeier, Maik and Peschke, Sven and Haeb-Umbach, Reinhold},
    year={2009} }'
  chicago: Bevermeier, Maik, Sven Peschke, and Reinhold Haeb-Umbach. “Eine Plattform
    Fuer Mehrwertdienste Im Bereich Logistik - Drahtlose Fahrzeug- Und Laderaumueberwachung
    Fuer LKW Mit Hilfe Einer Maut-On-Board Unit.” In <i>DGON Navigationskonvent 2009</i>,
    2009.
  ieee: M. Bevermeier, S. Peschke, and R. Haeb-Umbach, “Eine Plattform fuer Mehrwertdienste
    im Bereich Logistik - Drahtlose Fahrzeug- und Laderaumueberwachung fuer LKW mit
    Hilfe einer Maut-On-Board Unit,” in <i>DGON Navigationskonvent 2009</i>, 2009.
  mla: Bevermeier, Maik, et al. “Eine Plattform Fuer Mehrwertdienste Im Bereich Logistik
    - Drahtlose Fahrzeug- Und Laderaumueberwachung Fuer LKW Mit Hilfe Einer Maut-On-Board
    Unit.” <i>DGON Navigationskonvent 2009</i>, 2009.
  short: 'M. Bevermeier, S. Peschke, R. Haeb-Umbach, in: DGON Navigationskonvent 2009,
    2009.'
date_created: 2019-07-12T05:27:03Z
date_updated: 2022-01-06T06:51:07Z
department:
- _id: '54'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/BePeHa09-2.pdf
oa: '1'
publication: DGON Navigationskonvent 2009
status: public
title: Eine Plattform fuer Mehrwertdienste im Bereich Logistik - Drahtlose Fahrzeug-
  und Laderaumueberwachung fuer LKW mit Hilfe einer Maut-On-Board Unit
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11847'
abstract:
- lang: eng
  text: In this paper we present a new feature space dereverberation technique for
    automatic speech recognition. We derive an expression for the dependence of the
    reverberant speech features in the log-mel spectral domain on the non-reverberant
    speech features and the room impulse response. The obtained observation model
    is used for a model based speech enhancement based on Kalman filtering. The performance
    of the proposed enhancement technique is studied on the AURORA5 database. In our
    currently best configuration, which includes uncertainty decoding, the number
    of recognition errors is approximately halved compared to the recognition of unprocessed
    speech.
author:
- first_name: Alexander
  full_name: Krueger, Alexander
  last_name: Krueger
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Krueger A, Haeb-Umbach R. Model based feature enhancement for automatic speech
    recognition in reverberant environments. In: <i>Interspeech 2009</i>. ; 2009.'
  apa: Krueger, A., &#38; Haeb-Umbach, R. (2009). Model based feature enhancement
    for automatic speech recognition in reverberant environments. In <i>Interspeech
    2009</i>.
  bibtex: '@inproceedings{Krueger_Haeb-Umbach_2009, title={Model based feature enhancement
    for automatic speech recognition in reverberant environments}, booktitle={Interspeech
    2009}, author={Krueger, Alexander and Haeb-Umbach, Reinhold}, year={2009} }'
  chicago: Krueger, Alexander, and Reinhold Haeb-Umbach. “Model Based Feature Enhancement
    for Automatic Speech Recognition in Reverberant Environments.” In <i>Interspeech
    2009</i>, 2009.
  ieee: A. Krueger and R. Haeb-Umbach, “Model based feature enhancement for automatic
    speech recognition in reverberant environments,” in <i>Interspeech 2009</i>, 2009.
  mla: Krueger, Alexander, and Reinhold Haeb-Umbach. “Model Based Feature Enhancement
    for Automatic Speech Recognition in Reverberant Environments.” <i>Interspeech
    2009</i>, 2009.
  short: 'A. Krueger, R. Haeb-Umbach, in: Interspeech 2009, 2009.'
date_created: 2019-07-12T05:29:24Z
date_updated: 2022-01-06T06:51:11Z
department:
- _id: '54'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/KrHa09.pdf
oa: '1'
publication: Interspeech 2009
status: public
title: Model based feature enhancement for automatic speech recognition in reverberant
  environments
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11859'
abstract:
- lang: eng
  text: In this paper we present an Uncertainty Decoding rule which exploits feature
    reliability information and interframe correlation for noise robust speech recognition.
    The reliability information can be obtained either from conditional Bayesian estimation,
    where speech and noise feature vectors are tracked jointly, or by augmenting conventional
    point estimation methods with heuristics about the estimator's reliability. Experimental
    results on the AURORA2 database demonstrate on the one hand that Uncertainty Decoding
    improves recognition performance, while on the other hand it is seen that the
    severe approximations needed to arrive at computationally tractable solutions
    have their noticable impact on recognition performance.
author:
- first_name: Volker
  full_name: Leutnant, Volker
  last_name: Leutnant
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Leutnant V, Haeb-Umbach R. On the Estimation and Use of Feature Reliability
    Information for Noise Robust Speech Recognition. In: <i>International Conference
    on Acoustics (NAG/DAGA 2009)</i>. ; 2009.'
  apa: Leutnant, V., &#38; Haeb-Umbach, R. (2009). On the Estimation and Use of Feature
    Reliability Information for Noise Robust Speech Recognition. In <i>International
    Conference on Acoustics (NAG/DAGA 2009)</i>.
  bibtex: '@inproceedings{Leutnant_Haeb-Umbach_2009, title={On the Estimation and
    Use of Feature Reliability Information for Noise Robust Speech Recognition}, booktitle={International
    Conference on Acoustics (NAG/DAGA 2009)}, author={Leutnant, Volker and Haeb-Umbach,
    Reinhold}, year={2009} }'
  chicago: Leutnant, Volker, and Reinhold Haeb-Umbach. “On the Estimation and Use
    of Feature Reliability Information for Noise Robust Speech Recognition.” In <i>International
    Conference on Acoustics (NAG/DAGA 2009)</i>, 2009.
  ieee: V. Leutnant and R. Haeb-Umbach, “On the Estimation and Use of Feature Reliability
    Information for Noise Robust Speech Recognition,” in <i>International Conference
    on Acoustics (NAG/DAGA 2009)</i>, 2009.
  mla: Leutnant, Volker, and Reinhold Haeb-Umbach. “On the Estimation and Use of Feature
    Reliability Information for Noise Robust Speech Recognition.” <i>International
    Conference on Acoustics (NAG/DAGA 2009)</i>, 2009.
  short: 'V. Leutnant, R. Haeb-Umbach, in: International Conference on Acoustics (NAG/DAGA
    2009), 2009.'
date_created: 2019-07-12T05:29:38Z
date_updated: 2022-01-06T06:51:11Z
department:
- _id: '54'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/LeHa09-1.pdf
oa: '1'
publication: International Conference on Acoustics (NAG/DAGA 2009)
status: public
title: On the Estimation and Use of Feature Reliability Information for Noise Robust
  Speech Recognition
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11860'
abstract:
- lang: eng
  text: In this paper we present an analytic derivation of the moments of the phase
    factor between clean speech and noise cepstral or log-mel-spectral feature vectors.
    The development shows, among others, that the probability density of the phase
    factor is of sub-Gaussian nature and that it is independent of the noise type
    and the signal-to-noise ratio, however dependent on the mel filter bank index.
    Further we show how to compute the contribution of the phase factor to both the
    mean and the vari- ance of the noisy speech observation likelihood, which relates
    the speech and noise feature vectors to those of noisy speech. The resulting phase-sensitive
    observation model is then used in model-based speech feature enhancement, leading
    to significant improvements in word accuracy on the AURORA2 database.
author:
- first_name: Volker
  full_name: Leutnant, Volker
  last_name: Leutnant
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Leutnant V, Haeb-Umbach R. An analytic derivation of a phase-sensitive observation
    model for noise robust speech recognition. In: <i>Interspeech 2009</i>. ; 2009.'
  apa: Leutnant, V., &#38; Haeb-Umbach, R. (2009). An analytic derivation of a phase-sensitive
    observation model for noise robust speech recognition. In <i>Interspeech 2009</i>.
  bibtex: '@inproceedings{Leutnant_Haeb-Umbach_2009, title={An analytic derivation
    of a phase-sensitive observation model for noise robust speech recognition}, booktitle={Interspeech
    2009}, author={Leutnant, Volker and Haeb-Umbach, Reinhold}, year={2009} }'
  chicago: Leutnant, Volker, and Reinhold Haeb-Umbach. “An Analytic Derivation of
    a Phase-Sensitive Observation Model for Noise Robust Speech Recognition.” In <i>Interspeech
    2009</i>, 2009.
  ieee: V. Leutnant and R. Haeb-Umbach, “An analytic derivation of a phase-sensitive
    observation model for noise robust speech recognition,” in <i>Interspeech 2009</i>,
    2009.
  mla: Leutnant, Volker, and Reinhold Haeb-Umbach. “An Analytic Derivation of a Phase-Sensitive
    Observation Model for Noise Robust Speech Recognition.” <i>Interspeech 2009</i>,
    2009.
  short: 'V. Leutnant, R. Haeb-Umbach, in: Interspeech 2009, 2009.'
date_created: 2019-07-12T05:29:39Z
date_updated: 2022-01-06T06:51:11Z
department:
- _id: '54'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/LeHa09-2.pdf
oa: '1'
publication: Interspeech 2009
status: public
title: An analytic derivation of a phase-sensitive observation model for noise robust
  speech recognition
type: conference
user_id: '44006'
year: '2009'
...
---
_id: '11881'
abstract:
- lang: eng
  text: A combination of GPS (global positioning system) and INS (inertial navigation
    system) is known to provide high precision and highly robust vehicle localization.
    Notably during times when the GPS signal has a poor quality, e.g. due to the lack
    of a sufficiently large number of visible satellites, the INS, which may consist
    of a gyroscope and an odometer, will lead to improved positioning accuracy. In
    this paper we show how velocity information obtained from GSM (global system for
    mobile communications) signalling, rather than from a tachometer, can be used
    together with a gyroscope sensor to support localization in the presence of temporarily
    unavailable GPS data. We propose a sensor fusion system architecture and present
    simulation results that show the effectiveness of this approach.
author:
- first_name: Sven
  full_name: Peschke, Sven
  last_name: Peschke
- first_name: Maik
  full_name: Bevermeier, Maik
  last_name: Bevermeier
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Peschke S, Bevermeier M, Haeb-Umbach R. A GPS positioning approach exploiting
    GSM velocity estimates. In: <i>6th Workshop on Positioning Navigation and Communication
    (WPNC 2009)</i>. ; 2009:195-202. doi:<a href="https://doi.org/10.1109/WPNC.2009.4907827">10.1109/WPNC.2009.4907827</a>'
  apa: Peschke, S., Bevermeier, M., &#38; Haeb-Umbach, R. (2009). A GPS positioning
    approach exploiting GSM velocity estimates. In <i>6th Workshop on Positioning
    Navigation and Communication (WPNC 2009)</i> (pp. 195–202). <a href="https://doi.org/10.1109/WPNC.2009.4907827">https://doi.org/10.1109/WPNC.2009.4907827</a>
  bibtex: '@inproceedings{Peschke_Bevermeier_Haeb-Umbach_2009, title={A GPS positioning
    approach exploiting GSM velocity estimates}, DOI={<a href="https://doi.org/10.1109/WPNC.2009.4907827">10.1109/WPNC.2009.4907827</a>},
    booktitle={6th Workshop on Positioning Navigation and Communication (WPNC 2009)},
    author={Peschke, Sven and Bevermeier, Maik and Haeb-Umbach, Reinhold}, year={2009},
    pages={195–202} }'
  chicago: Peschke, Sven, Maik Bevermeier, and Reinhold Haeb-Umbach. “A GPS Positioning
    Approach Exploiting GSM Velocity Estimates.” In <i>6th Workshop on Positioning
    Navigation and Communication (WPNC 2009)</i>, 195–202, 2009. <a href="https://doi.org/10.1109/WPNC.2009.4907827">https://doi.org/10.1109/WPNC.2009.4907827</a>.
  ieee: S. Peschke, M. Bevermeier, and R. Haeb-Umbach, “A GPS positioning approach
    exploiting GSM velocity estimates,” in <i>6th Workshop on Positioning Navigation
    and Communication (WPNC 2009)</i>, 2009, pp. 195–202.
  mla: Peschke, Sven, et al. “A GPS Positioning Approach Exploiting GSM Velocity Estimates.”
    <i>6th Workshop on Positioning Navigation and Communication (WPNC 2009)</i>, 2009,
    pp. 195–202, doi:<a href="https://doi.org/10.1109/WPNC.2009.4907827">10.1109/WPNC.2009.4907827</a>.
  short: 'S. Peschke, M. Bevermeier, R. Haeb-Umbach, in: 6th Workshop on Positioning
    Navigation and Communication (WPNC 2009), 2009, pp. 195–202.'
date_created: 2019-07-12T05:30:04Z
date_updated: 2022-01-06T06:51:11Z
department:
- _id: '54'
doi: 10.1109/WPNC.2009.4907827
keyword:
- cellular radio
- distance measurement
- global positioning system
- Global Positioning System
- global system for mobile communications
- GPS positioning approach
- GSM velocity
- gyroscopes
- gyroscope sensor
- inertial navigation
- inertial navigation system
- odometer
- sensor fusion system architecture
- sensors
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2009/PeBeHa09-1.pdf
oa: '1'
page: 195-202
publication: 6th Workshop on Positioning Navigation and Communication (WPNC 2009)
status: public
title: A GPS positioning approach exploiting GSM velocity estimates
type: conference
user_id: '44006'
year: '2009'
...
