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Sökning: LAR1:lu > Gustafsson Mats

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1.
  • Alayón, Claudia, et al. (författare)
  • Sustainable production adoption by surface treatment SMEs : Challenges and enablers
  • 2015
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The adoption to sustainable production is a continuous but necessary strive for manufacturing operations, including small and medium enterprises, SMEs. Meeting the future needs of the economic, social and environmental dimensions provides challenges for SMEs. In order for these challenges to be met understanding of internal and external enablers is required. Studies focusing on the enablers for sustainability amongst SMEs are rare; hence these companies are important players in the supply chain to focal companies. In order to enhance the understanding of the adoption of sustainable production for the sector surface treatment SMEs, an explorative study has been conducted. In this study, the focus has been placed in the identification and analysis of the challenges and enablers for adoption of sustainable production. Two stages of empirical data collection were undertaken: a focus group session and an online questionnaire. The findings present challenges based on the limitations of the surface treatment process but also where enablers for the social, economic and environmental for meeting those challenges are strongly linked. The results showed that these SMEs face challenges in their way towards sustainable production, mainly due to: low economic profitability, need for improvement in old working procedures, lack of fully understanding regarding environmental legislation, difficulty in ensuring workforce, lack of technology development and resistance towards change. These challenges could be faced through internal and external enablers, where the support of large-size customers and other stakeholders is critical for these SMEs.
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2.
  • Alayon Glazunov, Andres (författare)
  • Mean effective gain of user equipment antennas in double directional channels
  • 2004
  • Ingår i: Proc. 15th IEEE Int. Symp. Personal, Indoor and Mobile Radio Communications PIMRC 2004. ; , s. 432-436
  • Konferensbidrag (refereegranskat)abstract
    •  This paper presents a revised definition of the Mean Effective Gain (MEG) of terminal antennas. It now includes the gain pattern of both the transmitting (BS) and receiving (MS) antennas, the path gain matrix as well as the joint angular power distributions of the two orthogonal polarizations at both ends. A closed form equation is provided followed by the analysis of some special cases and their practical implications.
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3.
  • Alayon Glazunov, Andres, et al. (författare)
  • MIMO Over-the-Air Testing
  • 2012
  • Ingår i: LTE-Advanced and Next Generation Wireless Networks. - Chichester, U.K. : John Wiley & Sons. - 9781119976707 ; , s. 411-441
  • Bokkapitel (refereegranskat)
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4.
  • Alayon Glazunov, Andres, et al. (författare)
  • On the mean effective gain expressed in terms of the spherical vector wave expansion of the electromagnetic field
  • 2008
  • Konferensbidrag (refereegranskat)abstract
    • The mode expansion o®ers a general framework for the analysis of the interaction between antennas andpropagation channels. In this paper, the Mean E®ective Gain (MEG) of an antenna is expressed in termsof the spherical vector wave expansion of the electromagnetic ¯eld. An explicit expression of the MEG isprovided as a function of the normalized average power of modes excited in the propagation channel andthe correlation between the channel modes due to the polarization and spatial selectivity of plane wavesimpinging at the antenna.
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6.
  • Alayon Glazunov, Andres, et al. (författare)
  • On the Physical Limitations of the Interaction of a Spherical Aperture and a Random Field
  • 2011
  • Ingår i: IEEE Transactions on Antennas and Propagation. - : IEEE. - 0018-926X .- 1558-2221. ; 59:1, s. 119-128
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper derives physical limitations on the interactions of antennas exciting TM or TE modes (but not both) and wireless propagation channels. The derivation is based on the spherical vector wave expansion of the electromagnetic field outside a sphere circumscribing the antennas. The result is an extension of the seminal work of Chu on the classical limitations on maximum antenna gain and radiation Q. Rather than maximizing antenna gain in a single direction we obtain physical limitations on the antenna gain pattern, which is directly translated to more condensed parameters, i.e., the instantaneous effective gain G(i) and the mean effective gain G(e) if instantaneous realizations or correlation statistics of the expansion coefficients of the electromagnetic field are known, spectively. The obtained limitations are on the maximum of G(i)/Q and G(e)/Q, which establish a trade-off between link gain and Q.
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