Research output per year
Research output per year
Personal profile
Profile
Ph.D. 1993 Dr.scient 2002
Research interests: Harmonic analysis, frame expansions, wavelets, Gabor systems
Other information
Visiting researcher at Georgia Institute of Technology (1997), University of Missouri (1998), University of Vienna (2002). Guest professor at University of San Luis, Argentina, 3 months in 1999, 2000, 2004. Held Ph.D. courses in Argentina, Germany, and South Korea. Extensive collaborations with KAIST in Korea and NUS in Singapore.
Research areas
Functional analysis Wavelet analysis Series expansions in Hilbert spacesEducation/Academic qualification
Ph.D., University of Aarhus, University of Vienna
1991 → 1993
Ph.D., University of Aarhus, University of Vienna
1991 → 1993
Master of Science, University of Aarhus
1985 → 1990
Master of Science, University of Aarhus
1985 → 1990
Keywords
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Collaborations and top research areas from the last five years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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A Survey on Frame Representations and Operator Orbits
Christensen, O. & Hasannasab, M., 2024, Applied and Numerical Harmonic Analysis. Springer, p. 349-370 (Applied and Numerical Harmonic Analysis).Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review
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The mystery of Carleson frames
Christensen, O., Hasannasab, M., Philipp, F. & Stoeva, D., 2024, In: Applied and Computational Harmonic Analysis. 72, 5 p., 101659.Research output: Contribution to journal › Letter › peer-review
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Truncations of generalized shift-invariant systems
Alvarez, P. G., Christensen, O. & Kim, R. Y., 2024, In: Canadian Mathematical Bulletin. 67, 2, p. 504-515Research output: Contribution to journal › Journal article › Research › peer-review
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Frames and generalized operator orbits
Christensen, O. & Hasannasab, M., 2023, In: Sampling Theory, Signal Processing, and Data Analysis. 21, 7 p., 22.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile49 Downloads (Pure) -
Approximate frame representations via iterated operator systems
Christensen, O. & Hasannasab, M., 2022, In: Studia Mathematica. 263, 19 p.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile288 Downloads (Pure)
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European Consortium for Mathematics in Industry (ECMI)
Sørensen, M. P. (Project Manager), Poulsen, N. K. (Project Participant), Brøns, M. (Project Participant), Hjorth, P. G. (Project Participant), Skovgaard, O. (Project Participant) & Christensen, O. (Project Participant)
01/01/1991 → …
Project: Research
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The frame set for Gabor systems generated by B-splines
Nielsen, K. H. (PhD Student), Lemvig, J. (Main Supervisor), Christensen, O. (Supervisor), Knudsen, K. (Examiner), Romero, J. L. (Examiner) & Nielsen, M. (Examiner)
Technical University of Denmark
01/08/2016 → 11/12/2019
Project: PhD
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Mathematic and Efficient Signal Representation
Hasannasabjaldehbakhani, M. (PhD Student), Christensen, O. (Main Supervisor), Lemvig, J. (Supervisor), Knudsen, K. (Examiner), Grosse-Erdmann, K. (Examiner) & Nielsen, M. (Examiner)
01/12/2015 → 12/12/2018
Project: PhD