hig.sePublications
Change search
Refine search result
1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Klang, David
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Barham, Allan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Faktorer kring äldres måltidssituation och deras påverkan på lönsamhet: Innovativa lösningar genom offentlig upphandling2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to examine how innovative solutions within public procurement concerning the elderly with aid decisions affect well-being and economic performance. Many decisions concerning human resources are taken without consideration for its economic effect. This means that measures to achieve improvement in this area are only seen as economic costs for organizations instead of investments since the positive effects on profitability is not calculated. To be able to predict the profitability of measures concerning human resources, there is a need to be able to measure the economic impact of these actions and then get a picture of the total costs of their implementation. In Söderhamns municipality, the distribution of food supplies to the elderly living at home in Trönö/Norrala was transferred to a private company. To measure the impact of this action empirical was data gathered from the municipality concerning current expenses and the nutritional status of the elderly. Interviews and own calculations were made in order to estimate costs that the municipality did not have in its own calculations. The results of this study showed a trend towards increased well-being of the elderly, which could mean a cost reduction in medical costs in the future. The private company that now handles the food distribution also hired more staff, which leads to increased tax revenue for the municipality. Even with these factors, the total cost of the new system is still higher than the old system. However, these factors do mean a lower total cost compared to previous cost estimates of the municipality for the new system. To get a more accurate picture of the total costs off this action more extensive calculations is required. However, this study is a step forward in how these kinds of actions can be measured financially in a way that sees more to how they affect society as a whole instead of just its affect in certain areas.

  • 2. Lagovsky, Boris A.
    et al.
    Samokhin, Alexander B.
    Shestopalov, Yury V.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Superresolution based on the methods of extrapolation2015In: PIERS 2015 Prague: Progress in Electromagnetics Research Symposium : Proceedings, Cambridge, MA: The Electromagnetics Academy , 2015, p. 1548-1551Conference paper (Refereed)
    Abstract [en]

    A new method of signal processing by smart antennas is proposed and justified. It allows to improve the accuracy of angle measurement and to restore the image of the object with superresolution. The method is based on the extrapolation of the signals received by each element of the antenna array, outside the aperture. This allows introducing new virtual elements and thus synthesizing significantly larger antenna array. The method is tested in numerical experiments using a mathematical model and the maximum effective angular resolution is found for different cases and objects. Algorithms based on the method of digital aperture synthesis provide angular superresolution 3-7 times greater than that according to the Rayleigh criterion for a signal/noise ratio of 12-13 dB.

  • 3.
    Samokhin, Alexander
    et al.
    Moscow Technological University (MIREA), Moscow, Russia.
    Samokhina, Anna
    Trapeznikov Institute of Control Sciences of the Russian Academy of Sciences, Moscow, Russia.
    Shestopalov, Yury
    Moscow Technological University (MIREA), Moscow, Russia.
    Analysis and solution method for problems of electromagnetic wave scattering on dielectric and perfectly conducting structures2017In: Differential equations, ISSN 0012-2661, E-ISSN 1608-3083, Vol. 53, no 9, p. 1165-1173Article in journal (Refereed)
    Abstract [en]

    Problems of electromagnetic wave scattering on 3D dielectric structures in the presence of bounded perfectly conducting surfaces are reduced to a system of singular integral equations. We study this system mathematically and suggest a numerical solution method.

  • 4.
    Samokhin, Alexander
    et al.
    Moscow Technical University MIREA, Moscow, Russia.
    Samokhina, Anna
    Trapeznikov Institute of Control Sciences of the Russian Academy of Sciences, Moscow, Russia.
    Shestopalov, Yury
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Discretization Methods for Three-Dimensional Singular Integral Equations of Electromagnetism2018In: Differential equations, ISSN 0012-2661, E-ISSN 1608-3083, Vol. 54, no 9, p. 1225-1235Article in journal (Refereed)
    Abstract [en]

    Theorems providing the convergence of approximate solutions of linear operator equations to the solution of the original equation are proved. The obtained theorems are used to rigorously mathematically justify the possibility of numerical solution of the 3D singular integral equations of electromagnetism by the Galerkin method and the collocation method.

  • 5.
    Shestopalov, Yury
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    How to overcome nonuniqueness of permittivity reconstruction in inverse waveguide problems2018Conference paper (Refereed)
  • 6.
    Shestopalov, Yury
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Kuzmina, Ekaterina
    Russian Technological University MIREA, Moscow, Russia.
    On a rigorous proof of the existence of complex waves in a dielectric waveguide of circular cross section2018In: Progress in Electromagnetics Research B, ISSN 1937-6472, E-ISSN 1937-6472, Vol. 82, p. 137-164Article in journal (Refereed)
    Abstract [en]

    Existence of symmetric complex waves in a dielectric rod (DR) - a dielectric waveguide of circular cross section - is proved by analyzing functional properties of the dispersion equations (DEs) using the theory of functions of several complex variables and validating the existence of complex roots of DE. A closed-form iteration procedure for calculating the roots in the complex domain supplied with efficient choice of initial approximation is proposed. Numerical modeling is performed with the help of a parameter-differentiation method applied to the analytical and numerical solution of DEs.

  • 7.
    Shestopalov, Yury
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Samokhin, Alexander
    Russian Technological University MIREA.
    Lagovsky, Boris
    Russian Technological University MIREA.
    Increasing the Range of UWB Radars2018In: IET Conference Publications 2018, Piscataway, New Jersey, USA: IEEE, 2018, Vol. CP741, article id 1570403971Conference paper (Refereed)
    Abstract [en]

    The use of UWB radars makes it possible to detect, recognize, and carry out measurements of coordinate and velocities of hardly noticeable radar targets. The variational problems of searching for the maximum range of UWB-radar operation using optimization of the shape and duration of UWB-pulses are justified and solved.

  • 8.
    Shestopalov, Yury
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Smirnov, Yury G.
    Penza State University, Russian Federation .
    Derevyanchuk, Ekaterina D.
    Penza State University, Russian Federation .
    Permittivity reconstruction of a diaphragm in a rectangular waveguide: Unique solvability of benchmark inverse problems2015In: PIERS 2015 Prague: Progress in Electromagnetics Research Symposium : Proceedings, Cambridge, MA: The Electromagnetics Academy , 2015, p. 1528-1532Conference paper (Refereed)
    Abstract [en]

    This work is devoted to the analysis of inverse problems of permittivity reconstruction of diaphragms loaded in a rectangular waveguide including justification of the solution to a benchmark inverse problem of reconstructing permittivity of a one-sectional diaphragm. We perform comparison of theoretical and numerical results based on the measurement data to validate the efficiency of the proposed technique. The obtained solutions can be implemented in practical measurements for investigation of new artificial materials and media and can be applied in optics, nanotechnology, and design of microwave devices.

  • 9.
    Smolkin, Eugene
    Penza State University, Penza, Russian Federation.
    Numerical Method for Electromagnetic Wave Propagation Problem in a Cylindrical Inhomogeneous Metal Dielectric Waveguiding Structures2017In: Mathematical Modelling and Analysis, ISSN 1392-6292, E-ISSN 1648-3510, Vol. 22, no 3, p. 271-282Article in journal (Refereed)
    Abstract [en]

    The propagation of monochromatic electromagnetic waves in metal circular cylindrical dielectric waveguides filled with inhomogeneous medium is considered. The physical problem is reduced to solving a transmission eigenvalue problem for a system of ordinary differential equations. Spectral parameters of the problem are propagation constants of the waveguide. Numerical results are found with a projection method. The comparison with known exact solutions (for particular values of parameters) is made.

  • 10. Smolkin, Eugene Y.
    et al.
    Shestopalov, Yury V.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Nonlinear goubau line: Numerical study of te-polarized waves2015In: PIERS 2015 Prague: Progress in Electromagnetics Research Symposium : Proceedings, Cambridge, MA: The Electromagnetics Academy , 2015, p. 1513-1517Conference paper (Refereed)
    Abstract [en]

    The propagation of monochromatic electromagnetic TE waves in the Goubau line (conducting cylinder covered by a concentric dielectric layer) filled with nonlinear inhomogeneous medium is considered. Two types of nonlinearity are studied. A physical problem is reduced to solving a nonlinear transmission eigenvalue problem for an ordinary differential equation. Eigenvalues of the problem correspond to propagation constants of the waveguide. A method is proposed for finding approximate eigenvalues of the nonlinear problem based on solving an auxiliary Cauchy problem (by the shooting method). The existence of eigenvalues that correspond to a new propagation regime is predicted. A comparison with the linear case is given.

  • 11.
    Söderhäll, Bengt
    University of Gävle, Department of Education and Psychology, Ämnesavdelningen för didaktik.
    Siffror, siffror, siffror...2003In: Gefle Dagblad, ISSN 1103-9302, Vol. 28 februariArticle, book review (Other (popular science, discussion, etc.))
    Abstract [sv]

    Det tog tio år för den marockanske matematikern och matematikläraren - och en sån lärare! - Georges Ifrah att fara runt jorden och leta reda på siffror och tal och skriva den Räknekonstens kulturhistoria i två delar som nu även finns på svenska. (Del 1 anmäld i GD 9 september förra året.)

  • 12.
    Tomasek, Pavel
    et al.
    Tomas Bata University, Zlin, Czech Republic .
    Shestopalov, Yury
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Verification of computational model of transmission coefficients of waveguide filters2015In: PIERS 2015 Prague: Progress in Electromagnetics Research Symposium : Proceedings, Cambridge, MA: The Electromagnetics Academy , 2015, p. 1538-1541Conference paper (Refereed)
    Abstract [en]

    Owing to the recent research a method of estimating transmission coefficients for a waveguide of rectangular cross-section loaded with multi-layered parallel-plane dielectrics is found. Consequently, the analysis of the transmitted and reflected fields in terms of the scattering matrix formalism can be performed explicitly. This article is mainly based on comparisons between real measured and computed transmission coefficients of a waveguide filter. the computation employs analysis of closed-form solutions and numerical multi-parameter optimization. the presented waveguide filter is formed by multi-sectional diaphragms placed in a waveguide of rectangular cross-section. Comparison of the computed and measured transmission coefficients demonstrates that the difference is very low, rather marginal and thus the output of the work is considerably promising.

1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf