| 1. |
- Bergfors, Markus, et al.
(author)
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- 2006
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Conference paper (peer-reviewed)abstract
- Effective and efficient organisation of research and development is critical for firm performance. In this regard the centralisation versus decentralisation of R&D is a key issue that has been debated heavily. The resource-based view argues that R&D activities that are of strategic importance, have a wide applicability within the firms, or are potentially disruptive should be under tighter corporate control. However, while previous research has redominantly focused on product innovation, often equating R&D with the development of new products, this study examines the centralisation-decentralisation issue from a product, as well as a process innovation perspective. In this regard, case studies of three multinational companies, representing food and beverage, mining and minerals, and pulp and paper industry sectors advances the understanding of organising intrafirm R&D. The study reveals dual structures within the R&D organisation; one for product innovation and one for process innovation. A matrix consisting of product-process innovation on one axis and centralisation-decentralisation on the other is presented to illustrate nine forms in which the intrafirm R&D organisation can be configured. Depending on the objective of product and process innovation the R&D organisation should be either centralised or decentralised. Thus, by examining intrafirm centralisation-decentralisation in R&D organisations through a product and process innovation perspective this study opens up the R&D organisation and provide guidelines for organising intrafirm R&D.
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| 2. |
- Öztürk, Ahmet Erdi, et al.
(author)
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Diyanet as a Turkish Foreign Policy Tool: Evidence from the Netherlands and Bulgaria
- 2018
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In: Politics and Religion. - : CAMBRIDGE UNIV PRESS. - 1755-0483 .- 1755-0491. ; 11:3, s. 624-648
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Journal article (peer-reviewed)abstract
- How does Turkeys Presidency of Religious Affairs (Diyanet) act as an instrument of foreign policy (FP)? What are the factors that allow such an instrumentalization of Islam in Turkish FP? In addressing these questions, this paper uses semi-structured expert interviews from Bulgaria and the Netherlands. Although both countries host a sizeable Muslim minority, these populations differ in their characteristics and historical ties with Turkey. Comparing Diyanets role in the Netherlands with its recent Turkish-Muslim diaspora, and in Bulgaria with its centuries-old Muslim minority allows us to reveal variation in the practical engagement strategies that Diyanet adopts in different country contexts. Thus, this paper advances two main claims; first, Diyanet serves as a primary FP tool of Turkey in countries with a significant Turkish-Muslim minority. Secondly, this instrumentalization destabilizes secularization projects both at home and abroad.
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| 3. |
- Öztürk, Cüneyd, et al.
(author)
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On the Impact of Hardware Impairments on RIS-aided Localization
- 2022
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In: IEEE International Conference on Communications. - 1550-3607. ; 2022-May, s. 2846-2851
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Conference paper (peer-reviewed)abstract
- We investigate a reconfigurable intelligent surface (RIS)-aided near-field localization system with single-antenna user equipment (UE) and base station (BS) under hardware impairments by considering a practical phase-dependent RIS amplitude variations model. To analyze the localization performance under the mismatch between the practical model and the ideal model with unit-amplitude RIS elements, we employ the misspecified Cramér-Rao bound (MCRB). Based on the MCRB derivation, the lower bound (LB) on the mean-squared error for estimation of UE position is evaluated and shown to converge to the MCRB at low signal-to-noise ratios (SNRs). Simulation results indicate more severe performance degradation due to the model misspecification with increasing SNR. In addition, the mismatched maximum likelihood (MML) estimator is derived and found to be tight to the LB in the high SNR regime. Finally, we observe that the model mismatch can lead to an order-of-magnitude localization performance loss at high SNRs.
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| 4. |
- Özyagci, Ali, 1982-
(author)
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Selfish Dynamic Spectrum Access in Multichannel Wireless Networks : Complete and incomplete information analysis
- 2011
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Licentiate thesis (other academic/artistic)abstract
- The increasing popularity and widespread deployment of wireless data systems fuel the increasing demand for more spectrum. On the other hand, various studies measuring spectrum utilization show that there is a huge variation in spectrum utilization at different times and locations. In view of this, various dynamic spectrum access (DSA) methods have been proposed in order to achieve more efficient utilization of spectrum resources by virtue of exploiting the variations in spectrum demand over time and space. Implementing DSA systems in a centralized way can lead to complexity and scalability problems due to the extensive control signaling involved. Therefore distributed implementations of DSA systems in which the users can access the system resources at their own discretion have been proposed. These distributed mechanisms typically incorporate cognitive radio systems which act as agents on behalf of users to measure the radio environment and make decisions based on these measurements. On the other hand, the freedom of the users in distributed systems to form their actions can lead each user to try to maximize its benefit from the system without regard the overall performance of the DSA system. Therefore, selfish behavior can prevail in distributed systems, which is likely to degrade the system performance.In this thesis we investigate the implications of selfish decision making in dynamic spectrum access systems. To address this broad problem, we focus our analysis on a particular system which can represent the essential properties of DSA systems and thus can shed light on the performance of the broad class of DSA systems with selfish users. Specifically, we model a DSA system as a multichannel random access system which uses ALOHA for medium access, and we analyze the behavior of the selfish users by modeling the system as a non-cooperative game. In this analysis we incorporate the effect of channel state information on the decision making of the users; we consider both cases when the users act on global (complete) and on local (incomplete) information. We determine the behavior of the selfish users at the Nash equilibria of the non-cooperative game and measure the performance of the system in terms of sum and individual utilities for various user loads and amount of available resources. We try to identify how the performance of the DSA system with selfish users compares with its cooperative counterpart. By performing these analyses we provide insights into the broader question of whether selfish users can utilize spectrum resources in a DSA system as well as cooperative users.
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| 5. |
- Aghasi, Keivan, 1983-, et al.
(author)
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Other publication (other academic/artistic)abstract
- The present paper reviews the literature on the role of top management teams (TMT) in mergers and acquisitions (M&A). Given variety of theoretical lenses applied in this field - such as agency theory or upper echelon – and the plethora of on-going empirical studies in the last three decades, we believe this literature review has a crucial value for the existing strand of studies and future studies to come. In particular, it systematizes the extant knowledge by documenting the contradictory results of prior empirical studies, making argument on the sources of these contradictions, and pointing out future directions of research.
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| 6. |
- Birgersson, Tobias, 1973
(author)
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- 2018
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In: November 10 -18th 2018, Täby Kulturcentrum, Karby Gård, Sweden..
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Artistic work (other academic/artistic)
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| 7. |
- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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| 8. |
- Aad, G., et al.
(author)
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- 2011
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swepub:Mat__t (peer-reviewed)
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| 9. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 10. |
- Aad, G., et al.
(author)
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- 2011
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swepub:Mat__t (peer-reviewed)
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