Photo of Matti Lassas
  • PL 68 (Pietari Kalmin katu 5)

    00014

    Finland

1997 …2025
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Publications 1997 2019

2019

Correlation imaging in inverse scattering is tomography on probability distributions

Caro, P., Helin, T., Kujanpää, A. & Lassas, M., Jan 2019, In : Inverse Problems. 35, 1, 20 p., 015010.

Research output: Contribution to journalArticleScientificpeer-review

Determination of a Riemannian manifold from the distance difference functions

Lassas, M. & Saksala, T., 2019, (Accepted/In press) In : Asian Journal of Mathematics.

Research output: Contribution to journalArticleScientificpeer-review

Inverse scattering for a random potential

Caro, P., Helin, T. & Lassas, M., Jul 2019, In : Analysis and Applications. 17, 4, p. 513-567 55 p.

Research output: Contribution to journalArticleScientificpeer-review

Learning the invisible: a hybrid deep learning-shearlet framework for limited angle computed tomography

Bubba, T. A., Kutyniok, G., Lassas, M., März, M., Samek, W., Siltanen, S. & Srinivasan, V., 30 May 2019, In : Inverse Problems. 35, 6, 38 p., 064002.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

The Poisson embedding approach to the Calderón problem

Lassas, M., Liimatainen, T. & Salo, M., 21 Mar 2019, In : Mathematische Annalen.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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Unique recovery of lower order coefficients for hyperbolic equations from data on disjoint sets

Kian, Y., Kurylev, Y., Lassas, M. & Oksanen, L., 5 Aug 2019, In : Journal of Differential Equations. 267, 4, p. 2210-2238 29 p.

Research output: Contribution to journalArticleScientificpeer-review

2018

Correlation based passive imaging with a white noise source

Helin, T., Lassas, M., Oksanen, L. & Saksala, T., Aug 2018, In : Journal de Mathematiques Pures et Appliquées. 116, p. 132-160 29 p.

Research output: Contribution to journalArticleScientificpeer-review

Fitting a Putative Manifold to Noisy Data

Fefferman, C., Ivanov, S., Kurylev, Y., Lassas, M. & Narayanan, H., 2018, Proceedings of COLT 2018 (Conference On Learning Theory). Bubeck, S., Perchet, V. & Rigollet, P. (eds.). Vol. 75. p. 688-720 32 p. (Proceedings of Machine Learning Research; vol. 75).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Inverse problems for linear and non-linear hyperbolic equations

Lassas, M. J., 2018, Proceedings of International Congress of Mathematicians ICM 2018. Sirakov, B. & Ney de Souza, P. (eds.). World Scientific, Vol. III.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Inverse problems for Lorentzian manifolds and non-linear hyperbolic equations

Kurylev, Y., Lassas, M. & Uhlmann, G., Jun 2018, In : Inventiones Mathematicae. 212, 3, p. 781-857 77 p.

Research output: Contribution to journalArticleScientificpeer-review

Inverse Problems for Semilinear Wave Equations on Lorentzian Manifolds

Lassas, M., Uhlmann, G. & Wang, Y., Jun 2018, In : Communications in Mathematical Physics. 360, 2, p. 555-609 55 p.

Research output: Contribution to journalArticleScientificpeer-review

On Absence and Existence of the Anomalous Localized Resonance without the Quasi-static Approximation

Kettunen, H., Lassas, M. & Ola, P., Feb 2018, In : SIAM Journal on Applied Mathematics. 78, 1, p. 609-628 20 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

On the Inverse Problem of Finding Cosmic Strings and Other Topological Defects

Lassas, M., Oksanen, L., Stefanov, P. & Uhlmann, G., Jan 2018, In : Communications in Mathematical Physics. 357, 2, p. 569-595 27 p.

Research output: Contribution to journalArticleScientificpeer-review

PROPAGATION AND RECOVERY OF SINGULARITIES IN THE INVERSE CONDUCTIVITY PROBLEM

Greenleaf, A., Lassas, M., Santacesaria, M., Siltanen, S. & Uhlmann, G., 2018, In : Analysis & PDE. 11, 8, p. 1901-1943 43 p.

Research output: Contribution to journalArticleScientificpeer-review

RECONSTRUCTION OF A COMPACT MANIFOLD FROM THE SCATTERING DATA OF INTERNAL SOURCES

Lassas, M., Saksala, T. & Zhou, H., Aug 2018, In : Inverse problems and imaging. 12, 4, p. 993-1031 39 p.

Research output: Contribution to journalArticleScientificpeer-review

Stability of the unique continuation for the wave operator via Tataru inequality: the local case

Bosi, R., Kurylev, Y. & Lassas, M., Feb 2018, In : Journal d'Analyse Mathematique. 134, 1, p. 157-199 43 p.

Research output: Contribution to journalArticleScientificpeer-review

SUPERDIMENSIONAL METAMATERIAL RESONATORS FROM SUB-RIEMANNIAN GEOMETRY

Greenleaf, A., Kettunen, H., Kurylev, Y., Lassas, M. & Uhlmann, G., 2018, In : SIAM Journal on Applied Mathematics. 78, 1, p. 437-456 20 p.

Research output: Contribution to journalArticleScientificpeer-review

Universal all-optical computing based on interconnected lasers

Von Lerber, T., Lassas, M., Trung Le, Q. & Küppers, F., 2018.

Research output: Conference materialsAbstractResearchpeer-review

2017

Amplitude Noise Suppression and Orthogonal Multiplexing Using Injection-Locked Single-Mode VCSEL

Lyubopytov, V. S., von Lerber, T., Lassas, M., Malekizandi, M., Chipouline, A. & Kueppers, F., 2017, OPTICAL FIBER COMMUNICATIONS CONFERENCE 2017. OSA Publishing, Vol. 2017. 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Conic singularities, generalized scattering matrix, and inverse scattering on asymptotically hyperbolic surfaces

Isozaki, H., Kurylev, Y. & Lassas, M., Mar 2017, In : Journal für die Reine und Angewandte Mathematik. 2017, 724, p. 53-103 51 p.

Research output: Contribution to journalArticleScientificpeer-review

DISTANCE DIFFERENCE REPRESENTATIONS OF SUBSETS OF COMPLETE RIEMANNIAN MANIFOLDS

Lassas, M. & Saksala, T., 2017, In : RIMS Kokyuroku. 2017.4, 2023, 19 p.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access

Injection-Locked Single-Mode VCSEL for Orthogonal Multiplexing and Amplitude Noise Suppression

Chipouline, A., Lyubopytov, V. S., Malekizandi, M., von Lerber, T., Lassas, M. & Küppers, F., 2017, 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC). IEEE, 1 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Inverse acoustic scattering problem in half-space with anisotropic random impedance

Helin, T. J., Lassas, M. J. & Päivärinta, L., 2017, In : Journal of Differential Equations. 262, 4, p. 3139-3168 30 p.

Research output: Contribution to journalArticleScientificpeer-review

Shearlet-based regularization in sparse dynamic tomography

Bubba, T. A., März, M., Purisha, Z., Lassas, M. & Siltanen, S., 24 Aug 2017, Wavelets and Sparsity XVII. Lu, Y. M., Van De Ville, D. & Papadakis, M. (eds.). Washington: SPIE - INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, 10 p. UNSP 103940Y. (Proceedings of SPIE; vol. 10394).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Superdimensional metamaterial resonators from sub-riemannian geometry

Greenleaf, A., Kettunen, H., Kurylev, Y., Lassas, M. & Uhlmann, G., 2017, p. 97. 1 p.

Research output: Conference materialsAbstractResearchpeer-review

2016

Determination of the spacetime from local time measurements

Lassas, M., Oksanen, L. & Yang, Y., Jun 2016, In : Mathematische Annalen. 365, 1-2, p. 271-307 37 p.

Research output: Contribution to journalArticleScientificpeer-review

Multiresolution Parameter Choice Method for Total Variation Regularized Tomography

Niinimäki, K., Lassas, M., Hämäläinen, K., Kallonen, A., Kolehmainen, V., Niemi, E. & Siltanen, S., 2016, In : SIAM journal on imaging sciences . 9, 3, p. 938-974 37 p.

Research output: Contribution to journalArticleScientificpeer-review

Positive-energy D-bar method for acoustic tomography: a computational study

de Hoop, M. V., Lassas, M., Santacesaria, M., Siltanen, S. & Tamminen, J. P., Feb 2016, In : Inverse Problems. 32, 2, 35 p., 025003.

Research output: Contribution to journalArticleScientificpeer-review

Posterior consistency and convergence rates for Bayesian inversion with hypoelliptic operators

Kekkonen, H., Lassas, M. & Siltanen, S., Aug 2016, In : Inverse Problems. 32, 8, 31 p., 085005.

Research output: Contribution to journalArticleScientificpeer-review

Regularization strategy for an inverse problem for a 1+1 dimensional wave equation

Korpela, J., Lassas, M. & Oksanen, L., Jun 2016, In : Inverse Problems. 32, 6, 24 p., 065001.

Research output: Contribution to journalArticleScientificpeer-review

Stability of the unique continuation for the wave operator via Tataru inequality and applications

Bosi, R., Kurylev, Y. & Lassas, M., 15 Apr 2016, In : Journal of Differential Equations. 260, 8, p. 6451-6492 42 p.

Research output: Contribution to journalArticleScientificpeer-review

THE BLOW-UP OF ELECTROMAGNETIC FIELDS IN 3-DIMENSIONAL INVISIBILITY CLOAKING FOR MAXWELL'S EQUATIONS

Lassas, M. & Zhou, T., 2016, In : SIAM Journal on Applied Mathematics. 76, 2, p. 457-478 22 p.

Research output: Contribution to journalArticleScientificpeer-review

THE BORDERLINES OF INVISIBILITY AND VISIBILITY IN CALDERON'S INVERSE PROBLEM

Astala, K., Lassas, M. & Päivärinta, L., 2016, In : Analysis & PDE. 9, 1, p. 43-98 56 p.

Research output: Contribution to journalArticleScientificpeer-review

The Calderon problem in transversally anisotropic geometries

Ferreira, D. D. S., Kurylev, Y., Lassas, M. & Salo, M., 2016, In : European Mathematical Society. Journal. 18, 11, p. 2579-2626 48 p.

Research output: Contribution to journalArticleScientificpeer-review

2015

Dynamic multi-source X-ray tomography using a spacetime level set method

Niemi, E., Lassas, M., Kallonen, A., Harhanen, L., Hamalainen, K. & Siltanen, S., 15 Jun 2015, In : Journal of Computational Physics. 291, p. 218-237 20 p.

Research output: Contribution to journalArticleScientificpeer-review

Inverse problems and invisibility cloaking for FEM models and resistor networks

Lassas, M., Salo, M. & Tzou, L., Feb 2015, In : Mathematical Models and Methods in Applied Sciences. 25, 2, 34 p.

Research output: Contribution to journalArticleScientificpeer-review

Inverse scattering on multi-dimensional asymptotically hyperbolic orbifolds

Isozaki, H., Kurylev, Y. & Lassas, M., 2015, Spectral Theory and Partial Differential Equations. Eskin, G., Friedlander, L. & Garnett, J. (eds.). American Mathematical Society, p. 71-85 15 p. (Contemporary Mathematics; vol. 640).

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Recovering the isometry type of a Riemannian manifold from local boundary diffraction travel times

de Hoop, M. V., Holman, S. F., Iversen, E., Lassas, M. & Ursin, B., Mar 2015, In : Journal de Mathematiques Pures et Appliquées. 103, 3, p. 830-848 19 p.

Research output: Contribution to journalArticleScientificpeer-review

2014

A direct reconstruction method for anisotropic electrical impedance tomography

Hamilton, S., Lassas, M. & Siltanen, M. S., Jul 2014, In : Inverse Problems. 30, 7, 33 p., 075007.

Research output: Contribution to journalArticleScientificpeer-review

Analysis of regularized inversion of data corrupted by white Gaussian noise

Kekkonen, H., Lassas, M. & Siltanen, M. S., Apr 2014, In : Inverse Problems. 30, 4, 18 p., 045009.

Research output: Contribution to journalArticleScientificpeer-review

Curvelet-based method for orientation estimation of particles from optical images

Sampo, J., Takalo, J. J., Siltanen, M. S., Miettinen, A., Lassas, M. & Timonen, J., Mar 2014, In : Optical Engineering. 53, 3, 10 p., 033109.

Research output: Contribution to journalArticleScientificpeer-review

D-bar method and exceptional points at positive energy: a computational study

Tamminen, J., de Hoop, M. V., Lassas, M. & Siltanen, S., 2014, In : Proceedings of the Project Review, Geo-Mathematical Imaging Group. 1, p. 389-415 27 p.

Research output: Contribution to journalArticleProfessional

Evaluation of the orientation distribution of fibers from reflection images of fibrous samples

Takalo, J., Timonen, J., Sampo, J., Marjanen, K., Siltanen, S. & Lassas, M., Jan 2014, In : European Physical Journal. Applied Physics. 65, 1, 10 p., 10703.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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Inverse Boundary Value Problems for the Perturbed Polyharmonic Operator

Krupchyk, K., Lassas, M. & Uhlmann, G., Jan 2014, In : Transactions of the American Mathematical Society. 366, 1, p. 95-112 18 p., PII S 0002-9947(2013)05713-3.

Research output: Contribution to journalArticleScientificpeer-review

INVERSE PROBLEM FOR THE RIEMANNIAN WAVE EQUATION WITH DIRICHLET DATA AND NEUMANN DATA ON DISJOINT SETS

Lassas, M. & Oksanen, L., 15 Apr 2014, In : Duke Mathematical Journal. 163, 6, p. 1071-1103 33 p.

Research output: Contribution to journalArticleScientificpeer-review

Inverse Problem for the Wave Equation with a White Noise Source

Helin, T., Lassas, M. & Oksanen, L., Dec 2014, In : Communications in Mathematical Physics. 332, 3, p. 933-953 21 p.

Research output: Contribution to journalArticleScientificpeer-review

Modelling and analysing oriented fibrous structures

Rantala, M., Lassas, M., Sampo, J., Takalo, J., Timonen, J. & Siltanen, M. S., 2014, In : Journal of Physics : Conference Series. 490, 4 p.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access
File

Reconstruction of a Conformally Euclidean Metric from Local Boundary Diffraction Travel Times

de Hoop, M. V., Holman, S. F., Iversen, E., Lassas, M. & Ursin, B., 2014, In : SIAM Journal on Mathematical Analysis. 46, 6, p. 3705-3726 22 p.

Research output: Contribution to journalArticleScientificpeer-review

Towards a "fingerprint" of paper network: separating forgeries from genuine by the properties of fibre structure

Takalo, J., Timonen, J., Sampo, J., Rantala, M., Siltanen, S. & Lassas, M., 2014, OPTICS AND PHOTONICS FOR COUNTERTERRORISM, CRIME FIGHTING, AND DEFENCE X: AND OPTICAL MATERIALS AND BIOMATERIALS IN SECURITY AND DEFENCE SYSTEMS TECHNOLOGY XI . Burgess, D., Owen, G., Rana, H., Zamboni, R., Kajzar, F. & Szep, AA. (eds.). Bellingham, WA: Washington SPIE , 10 p. 92530A. (Proceedings of SPIE; no. 9253).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Using the fibre structure of paper to determine authenticity of the documents: Analysis of transmitted light images of stamps and banknotes

Takalo, J., Timonen, J., Sampo, J., Rantala, M., Siltanen, S. & Lassas, M., Nov 2014, In : Forensic Science International. 244, p. 252-258 7 p.

Research output: Contribution to journalArticleScientificpeer-review