Keijo Ruotsalainen


Oulun yliopisto                            University of Oulu
Tieto- ja Sähkötekniikan tiedekunta        Faculty of Information and Electrical Engineering
Sovellettu ja Laskennallinen Matematiikka  Applied and Computational Mathematics
PL 4500                                    PB 4500
90401 OULU                                 FIN-90401 OULU FINLAND
                                                 
Puh.  : 0294 482651                        Tel.  : +358294482651
  
Huone : EO204                              Room  : EO204

sähköpostiosoite etunimipistesukunimiatoulupistefi

Teaching (Opetus)

Kurssit kevätlukukaudella 2017/Courses on Spring term

Kurssit syyslukukaudella 2017

Optimoinnin perusteet (Introduction to Optimization)

Tutkimus (Research)

Julkaisuja viime vuosilta (some recent publications):

  1. V. Chiad\'o Piat, S.A. Nazarov, K. M. Ruotsalainen; Spectral gaps and non-Bragg resonances in a water channel, to appear in Rendiconti dei Linzei Matematica è Applicazioni (2017).

  2. S.A. Nazarov, K. M. Ruotsalainen and P. Uusitalo; Localized waves in carbon nano-structures with connected and disconnected open waveguides, Materials Physics and Mechanics (2016), vol. 29, issue 2, pp. 116-124.

  3. S.A. Nazarov, K. M. Ruotsalainen and P. Uusitalo; Multifarious transmission conditions in the graph models of carbon nano-structures, Materials Physics and Mechanics (2016), vol. 29, issue 2, pp. 107-115.

  4. Nazarov S.A., Ruotsalainen M. and Silvola M.; Trapped modes in piezoelectric and elastic waveguides, Journal of Elasticity, Vol. 124, No. 2, pp. 193-223 (2016), DOI 10.1007/s10659-015-9565-y

  5. S.A. Nazarov and K. M. Ruotsalainen; A rigorous interpretation of approximate computations for embedded eigenfrequencies of water waves, ZAA (2016), 35(2), 211–242 (DOI: 10.4171/ZAA/1563)

  6. S.A. Nazarov, K. M. Ruotsalainen and M. Silvola; Trapped modes under interaction of elastic and electric fields in a piezoelectric waveguide, Doklady Physics (2015) 60(10):451-455, (DOI: 10.1134/S1028335815100043)

  7. S.A. Nazarov, K.M. Ruotsalainen, P. Uusitalo; Asymptotics of the spectrum of the Dirichlet Laplacian on a thin carbon nano-structure, Comptes Rendue M\'{e}canique (2015), vol. 343, 360--364, (DOI: 10.1016/j.crme.2015.03.001)

  8. Kemppainen J., Nazarov S.A. and Ruotsalainen K. M.; Perturbation analysis of embedded eigenvalues for water waves, J. Math. Anal. Appl. (2015), DOI:10.1016/j.jmaa.2015.02.050.

  9. S.A. Nazarov, K. M. Ruotsalainen and P. Uusitalo; Bound states of waveguides with two right-angled bends, Journal of Math. Phys., 56, 021505 (2015); doi: 10.1063/1.4907559.

  10. F.L. Bakharev, K. M. Ruotsalainen and J. Taskinen; Spectral gaps in the spectrum of the problem on surface waves in a periodic channel, Quartely Journal of Mechanics and Applied Mathematics (2014), vol. 67:3, 343-362 (doi:10.1093/qjmam/hbu009).

  11. S.A. Nazarov and K. M. Ruotsalainen; Criteria for trapped modes in a cranked channel with fixed and freely floating bodies, Z. Angew. Math. Phys. (2014), vol. 65:5, 977-1002 (DOI 10.1007/s00033-013-0386-1).

  12. S.A. Nazarov, K. M. Ruotsalainen and P. Uusitalo; The Y-junction of quantum waveguides, Z. angew. Math. Mech.(2013). doi: 10.1002/zamm.201200255.

  13. V. Chiadó Piat, S.A. Nazarov, K. Ruotsalainen; Spectral gaps for water waves above a corrugated bottom, Proc. Royal Soc. London A (2013), vol. 469, article no. 2149 20120545 (doi: 10.1098/rspa.2012.0545).

  14. F.L. Bakharev, S.A. Nazarov, K. M. Ruotsalainen; A gap in the spectrum of the Neumann-Laplacian on a singularly perturbed periodic waveguide, Appl. Anal., 92, issue 3, 2013 (http://dx.doi.org/10.1080/00036811.2012.711819).  

  15. G. Cardone, S.A. Nazarov, K. M. Ruotsalainen; Bound states of a converging quantum waveguide, ESAIM: Mathematical modelling and Numerical Analysis, vol. 47 (2013), p. 305-315 (DOI: 10.1051/m2an/2012033).

  16. Nazarov S.A., Ruotsalainen K. and Taskinen J.; Gaps in the spectrum of the Neumann problem in the perforated plane (in Russian), Dokl. Russ. Akad. Nauk. Vol. 444, No. 2, p. 151-156, 2012. (English transl.: Doklady Mathematics, 2012, Vol. 86, No.1, pp. 574-578).

  17. G. Cardone, S.A. Nazarov, K. Ruotsalainen; Asymptotics of an eigenvalue in the continuous spectrum of a converging waveguide (in Russian), Mat. Sbornik, Vol. 203, No. 2, 2012 (Engl. translation: Asymptotic behaviour of an eigenvalue in the continuous spectrum of a narrowed waveguide, Mat. Sb. Vol. 203, 2012).

  18. L. Korhonen and K. Ruotsalainen; Diffusion Tracking Algorithm for Image Segmentation, IGMAP and WINSYS 2012 - Proceedings of the International Conference on Signal Processing and Multimedia Applications and International Conference on Wireless Information Networksand Systems, Rome, Italy, 24-27 July, 2012.

  19. Nazarov S.A., Ruotsalainen K. M. and Taskinen J.; Spectral gaps in the Dirichlet and Neumann problems on the plane perforated by double-periodic family of circular holes, Journal of Mathematical Sciences, Vol. 181, No.2, pp. 164-222, 2012 (DOI: 10.1007/s10958-012-0681-y).

  20. Nazarov S.A., Ruotsalainen K. M. and Taskinen J.; Spectral gaps in the Dirichlet and Neumann problems on the plane perforated by double-periodic family of circular holes (in Russian), Problems in Mathematical Analysis 62, pp. 51-100, 2011.

  21. J. Kemppainen and K. M. Ruotsalainen; On the spline collocation method for the single layer equation related to time-fractional diffusion, Numer. Algor., Vol. 56 (2011) (DOI:http://dx-doi.org/10.1007/s11075-010-9430-9).

  22. S.A. Nazarov, K. M. Ruotsalainen and J. Taskinen; Essential spectrum of a periodic elastic waveguide may contain arbitrarily many gaps, Appl. Anal., vol. 90, No.1 (2010), pp.109--124.

  23. J. Kemppainen and K. Ruotsalainen; Boundary Integral solution of the time-fractional diffusion equation, Integr. Eq. Oper. Theory, vol. 64, pp. 239-249 (2009).

  24. S.A. Nazarov, K. M. Ruotsalainen and J. Taskinen; Gaps in the essential spectrum of infinite periodic necklace-shaped elastic waveguide, Comptes Rendus Mecanique, vol. 337, issue 2, 2009.

  25. Y. Wu, K. M. Ruotsalainen and M. Juntti; Unitary Space-Time Constellations Design Based on the Chernoff Bound of the Pairwise Error Probability, IEEE Trans. Inform. Theory, vol. 54, No. 8 (2008). 



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