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Asta Kärkkäinen
Principal Scientist, System Design and Technologies
NRC, Advanced System Engineering, Concept Design & Prototyping
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I received my Ph.D on the area of Atom, Molecule and Laser Physics from the University of Helsinki, in 1997. I worked as a teaching assistant at the Department of Physics and as a researcher in Quantum Optics group where my main interest was how to control molecules using ultra short laser pulses. I joined NRC in 1997. My main research fields in Nokia have been acoustics, multiphysics, nanosciences and recently how we can impact user experience with new technologies.
 

Professional Activities

I was the member of the Council of the Finnish Physical Society 2007-2008. I am a member of the division of the area protection of the Scientific Advisory Board for Defence. I am also the member of the Board of the FiDiPro H. Yamauchi and the NGS-nano Ph.D school.
 

Research Interests

I am analyzing diverse set of technologies from our NRC laboratories and outside for creation of the user experience of the future mobile devices. Every technological solution contains constraints on performance, latency, and energy consumption. On the other hand, size, reliability and manufacturability will also affect the productization of the new designs and concepts. In addition, the interdependencies between multiple devices and servers will challenge usability and scalability of the solution. My goal is to combine these aspects together for proposed solutions and provide information and data for productization decisions.
 

Research Projects

I have led projects in the area of acoustics developing simulation methods in collaboration with Research Institutes and Universities. My multi scale acoustics simulation tasks have included a hybrid method for car acoustics to optimize multi microphone beamforming, Head Related Transfer Function simulations for 3d audio with Ultra Weak Variational Formulation method, and coupled linearized Navier-Stokes FEM and Helmholtz Multilevel Fast Multipole BEM for predicting the full acoustics chain for mobile phones. As a research manager of the Predictive Engineering group in Mechanics and Integration competence area in Multi Media Technology laboratory, I have coordinated the research on Multidisciplinary design to enable optimal structural, thermal, acoustical and chemical performance of future Nokia devices. Within our research in the area of Nano Sciences we generated the Morph concept, a wearable – small, transparent, and stretchable - context aware device for mobile internet using the methods of nanotechnology. We won the Red Dot award from the concept design of Morph in 2008. My own research interest has been to build an analog machine for sensing and signal processing using nanocomponents and machine learning. With our partners (Helsinki University of Technology, University of Cambridge, CSC – Center of Scientific Computing) we have developed methods to design, fabricate, tailor and test devices with externally controllable functional materials and new kind of architectures suitable for the nano sized elements. Currently, I am analyzing diverse set of technologies from our NRC laboratories and outside for creation of the user experience of the future mobile devices. 
 

Publications

Some selected publications:
  • Paloviita, K.-A. Suominen, and S. Stenholm, “Molecular excitation by chirped pulses, “ Journal of Physics B: Atomic, Molecular and Optical Physics 28 (1995).
  • A. Paloviita, “Molecular Excitation by chirped pulses with independent time scales,” Optics Communications 119 (1995).       
  • A.Paloviita and K.-A. Suominen, “Molecular excitation by large-area ultrashort pulse,” Phys. Rev. A 55,  (1997).
  • S. Stenholm, and A. Paloviita, “States prepared by decay, “   Journal of Modern Optics (1997).
  • A. Paloviita, K.-A. Suominen and S. Stenholm, ” Weisskopf-Wiegner model for the wave packet excitation,” Journal of Physics B: Atomic, Molecular and Optical Physics (1997).
  • Tomi Huttunen, Eira T. Seppälä, Ole Kirkeby, Asta Kärkkäinen, and Leo Kärkkäinen, “Simulation of the transfer function for a head-and torso model over the entire audible frequency range,” Journal of Computational Acoustics, 15 (2007).
  • Y. Hancock, S. Haque, M. Karppinen, A. Kärkkäinen, L. Kärkkäinen, R. Lehtineimi, P. Pasanen, J. Perälä, E. Sahramo, K. Saloriutta, ”Atomic Layer Deposition (ALD) methods for fabricating graphene devices - theory and experiments”, APS March meeting 2009, Pittsburgh, Pennsylvania.
  • K. Saloriutta, Y. Hancock, A. Kärkkäinen, L. Kärkkäinen, A.-P. Jauho, M.J.Puska,”Transport properties of protruded graphene nanoribbons”, Physics Days 2009, Espoo.
  • A. Budde, S. Lacour, A. Kärkkäinen, T. Ryhänen, J. Saunamäki, and M. Welland, “Nokia Morph”, in P. Antonelli, Design and the Elastic Mind, the Museum on Modern Art, New Yourk, (2008), p.155.
  • M.A. Uusitalo, P. Andrew, M. Heino, A. Kärkkäinen, M. Rouvala, D. Wei, and T. Ryhänen, “Green technology options for future mobile devices”, Workshop on green wireless at WPMC08.
  • Y. Hancock, A. Kärkkäinen, R. Lehtiniemi, S. Haque, L. Kärkkäinen, M. Puska, R. Danneau, P. Hakonen, K. Saloriutta, A. Harju, Andreas Uppstu, “Electronic devices from graphene”, NTNE 2008, Copenhagen.
  • S. Haque, Y. Hancock, P. Hakonen, R. Lehtiniemi, L. Kärkkäinen, A. Kärkkäinen,”Graphene..”, Graphene week, (2008) Trieste, August 2008.
  • A. Kärkkäinen, “Nanoteknologian avulla tieto kulkee aina mukana”, Tietosuoja, 2008.
  • Kirkeby, E. Seppälä, A. Kärkkäinen, L. Kärkkäinen, and T. Huttunen, "Some Effects of The Torso on Head-Related Transfer Functions” Audio Engireering Society conferences," May5-8, 2007 Vienna, Austria.
  • Ermolov V., Heino M., Kärkkäinen A., Lehtiniemi, R., Nefedov N., Pasanen P., Radivojevic Z., Rouvala M., Ryhänen T., Seppälä, E., and Uusitalo M. A., "Significance of nanotechnology for future wireless devices and communicationS", The 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'07), Athens, Greece, 3.-7.9.2007.
  • J. Turku , M. Vilermo, E. Seppälä, M. Pölönen, O. Kirkeby, A. Kärkkäinen, L. Kärkkäinen, proceedings paper “Perceptual evaluation of numerically simulated Head-Related Transfer Functions”, AES 124th Convention in Amsterdam, May 17-20, 2008.
  • M. Malinen, S. Järvenpää, A. Kärkkäinen, L. Kärkkäinen, P. Råback, E. Seppälä, and P. Ylä-Oijala, "A Domain Decomposition Method for Coupled Equations of Acoustic Wave Motion," an extended (4 page, “conf. proc. paper”) abstract “ECCOMAS, Coupled problems 2007 –conference, May 21-23, Ibiza, Spain.
  • E.T. Seppälä, O. Kirkeby, A. Kärkkäinen,L. Kärkkäinen, T. Huttunen, ”Simulations of head-related transfer functions in wideband acoustics”, The Journal of the Acoustical Society of America,May 2006, 119, Issue 5, p. 3430.
  • E. Seppälä, A. Kärkkäinen, L. Kärkkäinen, “Analytical Solutions for Testing Finite Element, Boundary Element, and Ultra Weak Variational Formulation Method in Acoustics Simulations of Closed Cavities,” International Conference on Computational and Experimental Engineering & Science, Proceedings of ICCES’05, 1-10 December 2005, INDIA.
  • J. Rahola, A. Kärkkäinen, A. Ptchelintsev, and T. Aapro, "Designing mobile phones with multiphysics simulations," CSCnews (2005).
  • M. Malinen M. Lyly, P. Råback, A. Kärkkäinen, and L. Kärkkäinen, “A Finite Element Method for the Modelling of the Thermo-Viscous Effects in Acoustics,” Proceedings of European Congress on Computational Methods in Applied Sciences and Engineering ECCOMAS 2004, http://www.csc.fi/elmer/papers/eccomas2004-acoustics.pdf 
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  • A. Kärkkäinen, L. Kärkkäinen, “A sound in a box with different complex impedances on its walls,” Baltic-Nordic Acoustic Meeting 2004, proceedings, Marianhamina June 6-8. http://www.acoustics.hut.fi/asf/bnam04/webprosari/papers/o29.pdf.
  • A. Kärkkäinen, L. Kärkkäinen, J. Cozens, M. Malinen, P. Råback, “FEM Simulations of Thermal and Viscous Boundary Effects in Acoustics,”  ICA (Internartional Conference on Acoutics) Kyoto 2004.

 

 

Presentations

  • A. Kärkkäinen, “Future mobile devices”, RADECS 2008, 12.9.2008, Jyväskylä, invited talk
  • A. Kärkkäinen, “Nanotechnology for mobile devices”, ANM 2008, Aveiro, invited talk,
  • A. Kärkkäinen,”Challenges for future mobile phones”, Leti annual review, (2007), Grenoble, invited talk
  • A. Kärkkäinen, “Nanotechnology and environmental solutions”, The way we live next, (2007) Oulu

 
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