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- Özdemir, Metin, 1977-, et al.
(author)
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Improving dissemination of evidence‐based programs through researcher–practitioner collaboration
- 2014
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In: New Directions for Youth Development. - : Wiley. - 1533-8916 .- 1537-5781. ; 141, s. 107-116
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Journal article (peer-reviewed)abstract
- Prevention field has achieved major advances in developing, implementing, and testing the efficacy of preventive interventions in controlled settings. Nevertheless, there is still a gap in translating the success of programs in efficacy trials into real-life settings. Dissemination of evidence-based programs is a major challenge. The authors argue that promoting adoption of evidence-based programs requires further improvements in three areas, and collaboration between researchers and practitioners. First, there is a need to develop a holistic assessment system encompassing both risk/need and readiness assessments. Second, there is need for new methods for improving implementation quality. Third, prevention research needs to focus more on identifying the mechanisms that explain how programs work and the core elements of the program. Both researchers and practitioners have roles and opportunities to collaborate to achieve developments in these areas.
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- Özdogan, Özgecan, et al.
(author)
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Massive MIMO With Spatially Correlated Rician Fading Channels
- 2019
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In: IEEE Transactions on Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0090-6778 .- 1558-0857. ; 67:5, s. 3234-3250
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Journal article (peer-reviewed)abstract
- This paper considers multi-cell massive multiple-input multiple-output systems, where the channels are spatially correlated Rician fading. The channel model is composed of a deterministic line-of-sight path and a stochastic non-line-of-sight component describing a practical spatially correlated multipath environment. We derive the statistical properties of the minimum mean squared error (MMSE), element-wise MMSE, and least-square channel estimates for this model. Using these estimates for maximum ratio combining and precoding, rigorous closed-form uplink (UL) and downlink (DL) achievable spectral efficiency (SE) expressions are derived and analyzed. The asymptotic SE behavior, when using the different channel estimators, are also analyzed. The numerical results show that the SE is higher when using the MMSE estimator than that of the other estimators, and the performance gap increases with the number of antennas.
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- Özdogan, Özgecan, et al.
(author)
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Performance of Cell-Free Massive MIMO With Rician Fading and Phase Shifts
- 2019
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In: IEEE Transactions on Wireless Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 1536-1276 .- 1558-2248. ; 18:11, s. 5299-5315
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Journal article (peer-reviewed)abstract
- In this paper, we study the uplink (UL) and downlink (DL) spectral efficiency (SE) of a cell-free massive multiple-input-multiple-output (MIMO) system over Rician fading channels. The phase of the line-of-sight (LoS) path is modeled as a uniformly distributed random variable to take the phase-shifts due to mobility and phase noise into account. Considering the availability of prior information at the access points (APs), the phase-aware minimum mean square error (MMSE), non-aware linear MMSE (LMMSE), and least-square (LS) estimators are derived. The MMSE estimator requires perfectly estimated phase knowledge whereas the LMMSE and LS are derived without it. In the UL, a two-layer decoding method is investigated in order to mitigate both coherent and non-coherent interference. Closed-form UL SE expressions with phase-aware MMSE, LMMSE, and LS estimators are derived for maximum-ratio (MR) combining in the first layer and optimal large-scale fading decoding (LSFD) in the second layer. In the DL, two different transmission modes are studied: coherent and non-coherent. Closed-form DL SE expressions for both transmission modes with MR precoding are derived for the three estimators. Numerical results show that the LSFD improves the UL SE performance and coherent transmission mode performs much better than non-coherent transmission in the DL. Besides, the performance loss due to the lack of phase information depends on the pilot length and it is small when the pilot contamination is low.
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5. |
- Aad, G., et al.
(author)
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:8
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Journal article (peer-reviewed)
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- Ottosson, S.
(author)
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- 1998
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In: Technovation. - Amsterdam : Elsevier. - 0166-4972 .- 1879-2383. ; 18:4, s. 235-244
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Journal article (peer-reviewed)abstract
- This paper describes some of the complex relationships that exist between R&D (research and development) and M&S (marketing and sales). Factors impacting R&D and M&S are analysed such as company size, company age, wishes for changes in the individual company, etc. Seven propositions are presented. One specific finding from the study is that, for different product life cycles (PLCs), R&D and M&S often counteract so that when R&D spendings are allowed to increase, M&S spendings are reduced and vice versa. Management of technology (MoT) is not an exact science, and therefore the paper focuses on magnitudes of order instead of decimals in R&D and M&S expenditures for individual companies depending on branch, and differing situations. One important result of the investigation is that short PLCs means larger R&D spendings, and vice versa. (C) 1998 Elsevier Science Ltd. All rights reserved.
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8. |
- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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9. |
- Miranda Carranza, Pablo, 1972-, et al.
(author)
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- 2009
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Conference paper (other academic/artistic)abstract
- This paper gives an overview of the approach of working methods at the Aedas R&DComputational Design and Research [CDR] Group. It first contextualizes research inarchitectural practice and tries to propose an explanation for the difficulties inimplementing it; then explains the evolution of the groups’ computing approach frombespoke to heuristic sets of lightweight applications. It concludes with examples of thedeveloped computational design approach.
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10. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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