---
_id: '5590'
abstract:
- lang: eng
  text: 'Nowadays, providing employees with failure-free access to various systems,
    applications and services is a crucial factor for organizations? success as disturbances
    potentially inhibit smooth workflows and thereby harm productivity. However, it
    is a challenging task to assign access rights to employees? accounts within a
    satisfying time frame. In addition, the management of multiple accounts and identities
    can be very onerous and time consuming for the responsible administrator and therefore
    expensive for the organization. In order to meet these challenges, firms decide
    to invest in introducing an Identity and Access Management System (IAMS) that
    supports the organization by using policies to assign permissions to accounts,
    groups, and roles. In practice, since various versions of IAMSs exist, it is a
    challenging task to decide upon introduction of an IAMS. The following study proposes
    a first attempt of a decision support model for practitioners which considers
    four alternatives: Introduction of an IAMS with Role-based Access Control RBAC)
    or without and no introduction of IAMS again with or without RBAC. To underpin
    the practical applicability of the proposed model, we parametrize and operationalize
    it based on a real world use case using input from an expert interview.'
author:
- first_name: Eva
  full_name: Weishäupl, Eva
  last_name: Weishäupl
- first_name: Michael
  full_name: Kunz, Michael
  last_name: Kunz
- first_name: Emrah
  full_name: Yasasin, Emrah
  last_name: Yasasin
- first_name: Gerit
  full_name: Wagner, Gerit
  last_name: Wagner
- first_name: Julian
  full_name: Prester, Julian
  last_name: Prester
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
- first_name: Günther
  full_name: Pernul, Günther
  last_name: Pernul
citation:
  ama: 'Weishäupl E, Kunz M, Yasasin E, et al. Towards an Economic Approach to Identity
    and Access Management Systems Using Decision Theory. In: <i>2nd International
    Workshop on Security in Highly Connected IT Systems (SHCIS?15)</i>. ; 2015.'
  apa: Weishäupl, E., Kunz, M., Yasasin, E., Wagner, G., Prester, J., Schryen, G.,
    &#38; Pernul, G. (2015). Towards an Economic Approach to Identity and Access Management
    Systems Using Decision Theory. In <i>2nd International Workshop on Security in
    highly connected IT Systems (SHCIS?15)</i>.
  bibtex: '@inproceedings{Weishäupl_Kunz_Yasasin_Wagner_Prester_Schryen_Pernul_2015,
    title={Towards an Economic Approach to Identity and Access Management Systems
    Using Decision Theory}, booktitle={2nd International Workshop on Security in highly
    connected IT Systems (SHCIS?15)}, author={Weishäupl, Eva and Kunz, Michael and
    Yasasin, Emrah and Wagner, Gerit and Prester, Julian and Schryen, Guido and Pernul,
    Günther}, year={2015} }'
  chicago: Weishäupl, Eva, Michael Kunz, Emrah Yasasin, Gerit Wagner, Julian Prester,
    Guido Schryen, and Günther Pernul. “Towards an Economic Approach to Identity and
    Access Management Systems Using Decision Theory.” In <i>2nd International Workshop
    on Security in Highly Connected IT Systems (SHCIS?15)</i>, 2015.
  ieee: E. Weishäupl <i>et al.</i>, “Towards an Economic Approach to Identity and
    Access Management Systems Using Decision Theory,” in <i>2nd International Workshop
    on Security in highly connected IT Systems (SHCIS?15)</i>, 2015.
  mla: Weishäupl, Eva, et al. “Towards an Economic Approach to Identity and Access
    Management Systems Using Decision Theory.” <i>2nd International Workshop on Security
    in Highly Connected IT Systems (SHCIS?15)</i>, 2015.
  short: 'E. Weishäupl, M. Kunz, E. Yasasin, G. Wagner, J. Prester, G. Schryen, G.
    Pernul, in: 2nd International Workshop on Security in Highly Connected IT Systems
    (SHCIS?15), 2015.'
date_created: 2018-11-14T11:27:20Z
date_updated: 2022-01-06T07:02:04Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-07T11:46:28Z
  date_updated: 2018-12-13T15:09:54Z
  file_id: '6040'
  file_name: Towards an Economic Approach to IAMS.PDF
  file_size: 166015
  relation: main_file
file_date_updated: 2018-12-13T15:09:54Z
has_accepted_license: '1'
keyword:
- Identity and Access Management
- Economic Decision Making
- Information Systems
- Information Security Investment
- Decision Theory
language:
- iso: eng
oa: '1'
publication: 2nd International Workshop on Security in highly connected IT Systems
  (SHCIS?15)
status: public
title: Towards an Economic Approach to Identity and Access Management Systems Using
  Decision Theory
type: conference
user_id: '61579'
year: '2015'
...
---
_id: '11716'
abstract:
- lang: eng
  text: The accuracy of automatic speech recognition systems in noisy and reverberant
    environments can be improved notably by exploiting the uncertainty of the estimated
    speech features using so-called uncertainty-of-observation techniques. In this
    paper, we introduce a new Bayesian decision rule that can serve as a mathematical
    framework from which both known and new uncertainty-of-observation techniques
    can be either derived or approximated. The new decision rule in its direct form
    leads to the new significance decoding approach for Gaussian mixture models, which
    results in better performance compared to standard uncertainty-of-observation
    techniques in different additive and convolutive noise scenarios.
author:
- first_name: Ahmed H.
  full_name: Abdelaziz, Ahmed H.
  last_name: Abdelaziz
- first_name: Steffen
  full_name: Zeiler, Steffen
  last_name: Zeiler
- first_name: Dorothea
  full_name: Kolossa, Dorothea
  last_name: Kolossa
- 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: 'Abdelaziz AH, Zeiler S, Kolossa D, Leutnant V, Haeb-Umbach R. GMM-based significance
    decoding. In: <i>Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International
    Conference On</i>. ; 2013:6827-6831. doi:<a href="https://doi.org/10.1109/ICASSP.2013.6638984">10.1109/ICASSP.2013.6638984</a>'
  apa: Abdelaziz, A. H., Zeiler, S., Kolossa, D., Leutnant, V., &#38; Haeb-Umbach,
    R. (2013). GMM-based significance decoding. In <i>Acoustics, Speech and Signal
    Processing (ICASSP), 2013 IEEE International Conference on</i> (pp. 6827–6831).
    <a href="https://doi.org/10.1109/ICASSP.2013.6638984">https://doi.org/10.1109/ICASSP.2013.6638984</a>
  bibtex: '@inproceedings{Abdelaziz_Zeiler_Kolossa_Leutnant_Haeb-Umbach_2013, title={GMM-based
    significance decoding}, DOI={<a href="https://doi.org/10.1109/ICASSP.2013.6638984">10.1109/ICASSP.2013.6638984</a>},
    booktitle={Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International
    Conference on}, author={Abdelaziz, Ahmed H. and Zeiler, Steffen and Kolossa, Dorothea
    and Leutnant, Volker and Haeb-Umbach, Reinhold}, year={2013}, pages={6827–6831}
    }'
  chicago: Abdelaziz, Ahmed H., Steffen Zeiler, Dorothea Kolossa, Volker Leutnant,
    and Reinhold Haeb-Umbach. “GMM-Based Significance Decoding.” In <i>Acoustics,
    Speech and Signal Processing (ICASSP), 2013 IEEE International Conference On</i>,
    6827–31, 2013. <a href="https://doi.org/10.1109/ICASSP.2013.6638984">https://doi.org/10.1109/ICASSP.2013.6638984</a>.
  ieee: A. H. Abdelaziz, S. Zeiler, D. Kolossa, V. Leutnant, and R. Haeb-Umbach, “GMM-based
    significance decoding,” in <i>Acoustics, Speech and Signal Processing (ICASSP),
    2013 IEEE International Conference on</i>, 2013, pp. 6827–6831.
  mla: Abdelaziz, Ahmed H., et al. “GMM-Based Significance Decoding.” <i>Acoustics,
    Speech and Signal Processing (ICASSP), 2013 IEEE International Conference On</i>,
    2013, pp. 6827–31, doi:<a href="https://doi.org/10.1109/ICASSP.2013.6638984">10.1109/ICASSP.2013.6638984</a>.
  short: 'A.H. Abdelaziz, S. Zeiler, D. Kolossa, V. Leutnant, R. Haeb-Umbach, in:
    Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference
    On, 2013, pp. 6827–6831.'
date_created: 2019-07-12T05:26:53Z
date_updated: 2022-01-06T06:51:07Z
department:
- _id: '54'
doi: 10.1109/ICASSP.2013.6638984
keyword:
- Bayes methods
- Gaussian processes
- convolution
- decision theory
- decoding
- noise
- reverberation
- speech coding
- speech recognition
- Bayesian decision rule
- GMM
- Gaussian mixture models
- additive noise scenarios
- automatic speech recognition systems
- convolutive noise scenarios
- decoding approach
- mathematical framework
- reverberant environments
- significance decoding
- speech feature estimation
- uncertainty-of-observation techniques
- Hidden Markov models
- Maximum likelihood decoding
- Noise
- Speech
- Speech recognition
- Uncertainty
- Uncertainty-of-observation
- modified imputation
- noise robust speech recognition
- significance decoding
- uncertainty decoding
language:
- iso: eng
page: 6827-6831
publication: Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International
  Conference on
publication_identifier:
  issn:
  - 1520-6149
status: public
title: GMM-based significance decoding
type: conference
user_id: '44006'
year: '2013'
...
---
_id: '5632'
abstract:
- lang: eng
  text: 'Enduring doubts about the value of IS investments reveal that IS researchers
    have not fully managed to identify and to explain the economic benefits of IS.
    Three research tasks are essential requisites on the path towards addressing this
    criticism: the synthesis of knowledge, the identification of lack of knowledge,
    and the proposition of paths for closing knowledge gaps. This paper considers
    each of these tasks by a) synthesizing key research findings based on a comprehensive
    literature review, b) identifying and unfolding key limitations of current research,
    and c) applying a decision-theoretic perspective, which opens new horizons to
    IS business value research and shows paths for overcoming the limitations. The
    adoption of this perspective results in a decision-theoretic foundation of IS
    business value research and includes the proposition of a consistent terminology
    and a research model that frames further research.'
author:
- first_name: Guido
  full_name: Schryen, Guido
  id: '72850'
  last_name: Schryen
- first_name: Christian
  full_name: Bodenstein, Christian
  last_name: Bodenstein
citation:
  ama: 'Schryen G, Bodenstein C. A decision-theoretic foundation of IS business value
    research. In: <i>Proceedings of the 18th European Conference on Information Systems
    (ECIS 2010)</i>. ; 2010.'
  apa: Schryen, G., &#38; Bodenstein, C. (2010). A decision-theoretic foundation of
    IS business value research. In <i>Proceedings of the 18th European Conference
    on Information Systems (ECIS 2010)</i>.
  bibtex: '@inproceedings{Schryen_Bodenstein_2010, title={A decision-theoretic foundation
    of IS business value research}, booktitle={Proceedings of the 18th European Conference
    on Information Systems (ECIS 2010)}, author={Schryen, Guido and Bodenstein, Christian},
    year={2010} }'
  chicago: Schryen, Guido, and Christian Bodenstein. “A Decision-Theoretic Foundation
    of IS Business Value Research.” In <i>Proceedings of the 18th European Conference
    on Information Systems (ECIS 2010)</i>, 2010.
  ieee: G. Schryen and C. Bodenstein, “A decision-theoretic foundation of IS business
    value research,” in <i>Proceedings of the 18th European Conference on Information
    Systems (ECIS 2010)</i>, 2010.
  mla: Schryen, Guido, and Christian Bodenstein. “A Decision-Theoretic Foundation
    of IS Business Value Research.” <i>Proceedings of the 18th European Conference
    on Information Systems (ECIS 2010)</i>, 2010.
  short: 'G. Schryen, C. Bodenstein, in: Proceedings of the 18th European Conference
    on Information Systems (ECIS 2010), 2010.'
date_created: 2018-11-14T14:24:25Z
date_updated: 2022-01-06T07:02:14Z
ddc:
- '000'
department:
- _id: '277'
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hsiemes
  date_created: 2018-12-11T15:24:22Z
  date_updated: 2018-12-13T15:20:37Z
  file_id: '6193'
  file_name: IS business value - ECIS - Final Version.pdf
  file_size: 174368
  relation: main_file
file_date_updated: 2018-12-13T15:20:37Z
has_accepted_license: '1'
keyword:
- Decision theory
- IT value
- IS assessment
- IS evaluation
language:
- iso: eng
oa: '1'
publication: Proceedings of the 18th European Conference on Information Systems (ECIS
  2010)
status: public
title: A decision-theoretic foundation of IS business value research
type: conference
user_id: '61579'
year: '2010'
...