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31.
  • Baravdish, George, et al. (författare)
  • Damped second order flow applied to image denoising
  • 2019
  • Ingår i: IMA Journal of Applied Mathematics. - OXFORD UNIV PRESS. - 0272-4960 .- 1464-3634. ; 84:6, s. 1082-1111
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we introduce a new image denoising model: the damped flow (DF), which is a second order nonlinear evolution equation associated with a class of energy functionals of an image. The existence, uniqueness and regularization property of DF are proven. For the numerical implementation, based on the Stormer-Verlet method, a discrete DF, SV-DDF, is developed. The convergence of SV-DDF is studied as well. Several numerical experiments, as well as a comparison with other methods, are provided to demonstrate the efficiency of SV-DDF.
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32.
  • Baravdish, George, et al. (författare)
  • Extension of p-Laplace Operator for Image Denoising
  • 2016
  • Ingår i: 27th IFIP TC 7 Conference, CSMO 2015, Sophia Antipolis, France, June 29 - July 3, 2015, Revised Selected Papers. - Springer. - 9783319557946 - 9783319557953 ; s. 107-116
  • Bokkapitel (övrigt vetenskapligt)abstract
    • In this work we introduce a novel operator $$\displaystyle \varDelta _(p,q)$$ as an extended family of operators that generalize the p-Laplace operator. The operator is derived with an emphasis on image processing applications, and particularly, with a focus on image denoising applications. We propose a non-linear transition function, coupling p and q, which yields a non-linear filtering scheme analogous to adaptive spatially dependent total variation and linear filtering. Well-posedness of the final parabolic PDE is established via pertubation theory and connection to classical results in functional analysis. Numerical results demonstrates the applicability of the novel operator $$\displaystyle \varDelta _(p,q)$$ .
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33.
  • Baravdish, George, et al. (författare)
  • Extension of p-Laplace operator for image denoising
  • 2016
  • Ingår i: System Modeling and Optimization. - Springer. - 1868-4238. - 978-3-319-55795-3
  • Konferensbidrag (refereegranskat)abstract
    • In this work we introduce a novel operator ∆_(p;q) as an extended family of operators that generalize the p-Laplace operator. The operator is derived with an emphasis on image processing applications, and particularly, with a focus on image denoising applications. We propose a non-linear transition function, coupling p and q, which yields a non-linear ltering scheme analogous to adaptive spatially dependent total variation and linear ltering. Well-posedness of the nal parabolic PDE is established via pertubation theory and connection to classical results in functional analysis. Numerical results demonstrates the applicability of the novel operator∆_ (p;q).
34.
  • Baravdish, George, et al. (författare)
  • On Backward p(x)-Parabolic Equations for Image Enhancement
  • 2015
  • Ingår i: Numerical Functional Analysis and Optimization. - Taylor & Francis. - 0163-0563. ; 36:2, s. 147-168
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, we investigate the backward p(x)-parabolic equation as a new methodology to enhance images. We propose a novel iterative regularization procedure for the backward p(x)-parabolic equation based on the nonlinear Landweber method for inverse problems. The proposed scheme can also be extended to the family of iterative regularization methods involving the nonlinear Landweber method. We also investigate the connection between the variable exponent p(x) in the proposed energy functional and the diffusivity function in the corresponding Euler-Lagrange equation. It is well known that the forward problems converges to a constant solution destroying the image. The purpose of the approach of the backward problems is twofold. First, solving the backward problem by a sequence of forward problems we obtain a smooth image which is denoised. Second, by choosing the initial data properly we try to reduce the blurriness of the image. The numerical results for denoising appear to give improvement over standard methods as shown by preliminary results.
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35.
  • Baravdish, George, et al. (författare)
  • PDE-SVD Based Audio Denoising
  • 2012
  • Ingår i: Proceedings of the 5th International Symposium on Communications Control and Signal Processing (ISCCSP), 2012. - Piscataway, NJ, USA : IEEE. - 978-1-4673-0274-6 ; s. 1-6
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present a new method for denoising audio signals. The method is based on the Singular Value Decomposition (SVD) of the frame matrix representing the signal inthe Overlap Add decomposition. Denoising is performed by modifying both the singular values, using a tapering model, and the singular vectors of the representation, using a nonlinear PDE method. The performance of the method is evaluated and compared with denoising obtained by filtering.
36.
  • Berggren, Magnus, et al. (författare)
  • PEDOT : PSS-Based Electrochemical Transistors for Ion-to-Electron Transduction and Sensor Signal Amplification
  • 2008
  • Ingår i: Organic Semiconductors in Sensor Applications. - Springer. - 978-3-540-76314-7 - 978-3-540-76313-0 - 978-3-642-09517-7 ; s. 263-280
  • Bokkapitel (övrigt vetenskapligt)abstract
    • The chapter reports the use of organic electrochemical transistors in sensor applications. These transistors are excellent ion-to-electron transducers and can serve as very sensitive transducers in amperometric sensor applications. To further improve their sensitivity, we outline various amplification circuits all realized in organic electrochemical transistors.
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37.
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38.
  • Berntsson Svensson, Richard, 1978-, et al. (författare)
  • BAM backlog assessment method
  • 2019
  • Ingår i: Lecture Notes in Business Information Processing : AGILE PROCESSES IN SOFTWARE ENGINEERING AND EXTREME PROGRAMMING, XP 2019. - Springer Verlag. - 9783030190330 ; s. 53-68
  • Konferensbidrag (refereegranskat)abstract
    • The necessity of software as stand-alone products, and as central parts of non-traditional software products have changed how software products are developed. It started with the introduction of the agile manifesto and has resulted in a change of how software process improvements (SPI) are conducted. Although there are agile SPI methods and several agile practices for evaluating and improving current processes and ways-of-working, no method or practices for evaluating the backlog exists. To address this gap, the Backlog Assessment Method (BAM) was developed and applied in collaboration with Telenor Sweden. BAM enables agile organizations to assess backlogs, and assure that the backlog items are good-enough for their needs and well aligned with the decision process. The results from the validation show that BAM is feasible and relevant in an industrial environment, and it indicates that BAM is useful as a tool to perform analysis of items in a specific backlog. © The Author(s) 2019.
39.
40.
  • Bjärstig, Therese, 1978-, et al. (författare)
  • Between protocol and reality Swedish municipal comprehensive planning
  • 2018
  • Ingår i: European Planning Studies. - 0965-4313. ; 26:1, s. 35-54
  • Tidskriftsartikel (refereegranskat)abstract
    • Spatial planning using a landscape approach has been recognized as being essential for reconciling ecological, cultural and socioeconomic dimensions in sustainable development (SuD). Although embraced as a concept, there is a lack of planning tools capable of incorporating multi-level, multifunctional and multi-sectoral perspectives, especially in a rural context. The departure point in this paper is the legal requirements for municipal comprehensive planning (MCP) in Sweden and an e-mail survey about incentives, stakeholder involvement, policy integration and implementation in MCP in all 15 Swedish mountain municipalities. The purpose of this explorative study is to examine whether MCP could be a tool in planning for SuD. Results indicate a general lack of resources and a low status of MCP that affect, and even limit, stakeholder involvement, policy integration and implementation. However, legal requirements for MCP are targeted at SuD, and municipal personnel responsible for planning appreciate the potential of MCP. Therefore, there is potential to develop the MCP into an effective landscape planning tool. To accomplish this, the status of an active planning process has to be raised, the mandate of the local planning agency has to be secured, and residents and land users have to be involved throughout the planning process.
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