@article{BoeckmannBrueckner2001, author = {B{\"o}ckmann, Christine and Br{\"u}ckner, Axel}, title = {100 years of the Runge-Kutta method : a brief editing for schools}, issn = {0268-3679}, year = {2001}, abstract = {This paper reports on the historical development of the Runge-Kutta methods beginning with the simple Euler method up to an embedded 13-stage method. Moreover, the design and the use of those methods under error order, stability and computation time conditions is edited for students of numerical analysis at undergraduate level. The second part presents applications in natural sciences, compares different methods and illustrates some of the difficulties of numerical solutions.}, language = {en} } @article{BoesenbergAlpersBoeckmannetal.1998, author = {B{\"o}senberg, Jens and Alpers, Matthias and B{\"o}ckmann, Christine and J{\"a}ger, Horst and Matthias, Volker and Trickl, Thomas and Wandinger, Ulla and Wiegner, Matthias}, title = {A Lidar Network for the Establishment of an Aerosol Climatology}, year = {1998}, language = {en} } @article{Boeckmann1995, author = {B{\"o}ckmann, Christine}, title = {A modification of the trust-region Gauss-Newton method to solve separable nonlinear least squares problems}, year = {1995}, language = {en} } @book{Boeckmann1992, author = {B{\"o}ckmann, Christine}, title = {A modification of the Trust-Region Gauss-Newton method to solve separable nonlinear least squares problems}, series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik}, volume = {1992, 17}, journal = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik}, publisher = {Univ.}, address = {Potsdam}, pages = {14 Bl.}, year = {1992}, language = {en} } @misc{PornsawadSapsakulBoeckmann2019, author = {Pornsawad, Pornsarp and Sapsakul, Nantawan and B{\"o}ckmann, Christine}, title = {A modified asymptotical regularization of nonlinear ill-posed problems}, series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {1335}, issn = {1866-8372}, doi = {10.25932/publishup-47343}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-473433}, pages = {19}, year = {2019}, abstract = {In this paper, we investigate the continuous version of modified iterative Runge-Kutta-type methods for nonlinear inverse ill-posed problems proposed in a previous work. The convergence analysis is proved under the tangential cone condition, a modified discrepancy principle, i.e., the stopping time T is a solution of โˆฅ๐น(๐‘ฅ๐›ฟ(๐‘‡))-๐‘ฆ๐›ฟโˆฅ=๐œ๐›ฟ+ for some ๐›ฟ+>๐›ฟ, and an appropriate source condition. We yield the optimal rate of convergence.}, language = {en} } @article{PornsawadSapsakulBoeckmann2019, author = {Pornsawad, Pornsarp and Sapsakul, Nantawan and B{\"o}ckmann, Christine}, title = {A modified asymptotical regularization of nonlinear ill-posed problems}, series = {Mathematics}, volume = {7}, journal = {Mathematics}, edition = {5}, publisher = {MDPI}, address = {Basel, Schweiz}, issn = {2227-7390}, doi = {10.3390/math7050419}, pages = {19}, year = {2019}, abstract = {In this paper, we investigate the continuous version of modified iterative Runge-Kutta-type methods for nonlinear inverse ill-posed problems proposed in a previous work. The convergence analysis is proved under the tangential cone condition, a modified discrepancy principle, i.e., the stopping time T is a solution of โˆฅ๐น(๐‘ฅ๐›ฟ(๐‘‡))-๐‘ฆ๐›ฟโˆฅ=๐œ๐›ฟ+ for some ๐›ฟ+>๐›ฟ, and an appropriate source condition. We yield the optimal rate of convergence.}, language = {en} } @book{BoeckmannNiebsch1996, author = {B{\"o}ckmann, Christine and Niebsch, Jenny}, title = {A mollifier method for aerosol size}, series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik}, volume = {1996, 07}, journal = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik}, publisher = {Univ.}, address = {Potsdam}, pages = {[5] Bl.}, year = {1996}, language = {en} } @article{BoeckmannWandingerAnsmannetal.2004, author = {B{\"o}ckmann, Christine and Wandinger, Ulla and Ansmann, Albert and B{\"o}senberg, Jens and Amiridis, Vassilis and Boselli, Antonella and Delaval, Arnaud and De Tomasi, Ferdinando de and Frioud, Max and Grigorov, Ivan Videnov and Hagard, Arne and Horvat, Matej and Iarlori, Marco and Komguem, Leonce and Kreipl, Stephan and Larchevque, Gilles and Matthias, Volker and Papayannis, Alexandros and Pappalardo, GGelsomina and Rocadenbosch, Francesc and Rodrigues, Jose Ant{\ยดo}nio and Schneider, Johannes and Shcherbakov, Valery and Wiegner, Matthias}, title = {Aerosol lidar intercomparison in the framework of the EARLINET project : 2. Aerosol backscatter algorithms}, issn = {0003-6935}, year = {2004}, abstract = {An intercomparison of aerosol backscatter lidar algorithms was performed in 2001 within the framework of the European Aerosol Research Lidar Network to Establish an Aerosol Climatology (EARLINET). The objective of this research was to test the correctness of the algorithms and the influence of the lidar ratio used by the various lidar teams involved in the EARLINET for calculation of backscatter-coefficient profiles from the lidar signals. The exercise consisted of processing synthetic lidar signals of various degrees of difficulty. One of these profiles contained height- dependent lidar ratios to test the vertical influence of those profiles on the various retrieval algorithms. Furthermore, a realistic incomplete overlap of laser beam and receiver field of view was introduced to remind the teams to take great care in the nearest range to the lidar. The intercomparison was performed in three stages with increasing knowledge on the input parameters. First, only the lidar signals were distributed; this is the most realistic stage. Afterward the lidar ratio profiles and the reference values at calibration height were provided. The unknown height- dependent lidar ratio had the largest influence on the retrieval, whereas the unknown reference value was of minor importance. These results show the necessity of making additional independent measurements, which can provide us with a suitable approximation of the lidar ratio. The final stage proves in general, that the data evaluation schemes of the different groups of lidar systems work well. (C) 2004 Optical Society of America}, language = {en} } @article{BoeckmannBieleNeuber1998, author = {B{\"o}ckmann, Christine and Biele, Jens and Neuber, Roland}, title = {Analysis of multi-wavelength lidar data by inversion with mollifier method}, year = {1998}, language = {en} } @article{Boeckmann1998, author = {B{\"o}ckmann, Christine}, title = {Auswertung von multispektralen LidarmeรŸdaten}, year = {1998}, language = {de} } @phdthesis{Boeckmann2002, author = {B{\"o}ckmann, Christine}, title = {Bestimmung atmosph{\"a}rischer Aerosolparameter mit Hilfe von regularisierenden Inversionsverfahren}, pages = {167 S. : Anh.}, year = {2002}, language = {de} } @article{KammaneeBoeckmann2009, author = {Kammanee, Athassawat and B{\"o}ckmann, Christine}, title = {Boundary value method for inverse Sturm-Liouville problems}, issn = {0096-3003}, doi = {10.1016/j.amc.2009.04.002}, year = {2009}, abstract = {In this paper we present a method to recover symmetric and non-symmetric potential functions of inverse Sturm- Liouville problems from the knowledge of eigenvalues. The linear multistep method coupled with suitable boundary conditions known as boundary value method (BVM) is the main tool to approximate the eigenvalues in each iteration step of the used Newton method. The BVM was extended to work for Neumann-Neumann boundary conditions. Moreover, a suitable approximation for the asymptotic correction of the eigenvalues is given. Numerical results demonstrate that the method is able to give good results for both symmetric and non-symmetric potentials.}, language = {en} } @article{BoeckmannKammanee2011, author = {B{\"o}ckmann, Christine and Kammanee, Athassawat}, title = {Broyden method for inverse non-symmetric Sturm-Liouville problems}, series = {BIT : numerical mathematics ; the leading applied mathematics journal for all computational mathematicians}, volume = {51}, journal = {BIT : numerical mathematics ; the leading applied mathematics journal for all computational mathematicians}, number = {3}, publisher = {Springer}, address = {Dordrecht}, issn = {0006-3835}, doi = {10.1007/s10543-011-0317-5}, pages = {513 -- 528}, year = {2011}, abstract = {In this paper, we propose a derivative-free method for recovering symmetric and non-symmetric potential functions of inverse Sturm-Liouville problems from the knowledge of eigenvalues. A class of boundary value methods obtained as an extension of Numerov's method is the major tool for approximating the eigenvalues in each Broyden iteration step. Numerical examples demonstrate that the method is able to reduce the number of iteration steps, in particular for non-symmetric potentials, without accuracy loss.}, language = {en} } @article{BoeckmannSarkoeziAlthausen1999, author = {B{\"o}ckmann, Christine and Sark{\"o}zi, Janos and Althausen, Dietrich}, title = {Collocation Methods for Ill-posed Inverse Problems of Multiwavelength Lidar Measurements and Applications on LACE 98-Data}, year = {1999}, language = {en} } @misc{PornsawadSungcharoenBoeckmann2020, author = {Pornsawad, Pornsarp and Sungcharoen, Parada and B{\"o}ckmann, Christine}, title = {Convergence rate of the modified Landweber method for solving inverse potential problems}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {1034}, issn = {1866-8372}, doi = {10.25932/publishup-47194}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-471942}, pages = {24}, year = {2020}, abstract = {In this paper, we present the convergence rate analysis of the modified Landweber method under logarithmic source condition for nonlinear ill-posed problems. The regularization parameter is chosen according to the discrepancy principle. The reconstructions of the shape of an unknown domain for an inverse potential problem by using the modified Landweber method are exhibited.}, language = {en} } @article{PornsawadSungcharoenBoeckmann2020, author = {Pornsawad, Pornsarp and Sungcharoen, Parada and B{\"o}ckmann, Christine}, title = {Convergence rate of the modified Landweber method for solving inverse potential problems}, series = {Mathematics : open access journal}, volume = {8}, journal = {Mathematics : open access journal}, number = {4}, publisher = {MDPI}, address = {Basel}, issn = {2227-7390}, doi = {10.3390/math8040608}, pages = {22}, year = {2020}, abstract = {In this paper, we present the convergence rate analysis of the modified Landweber method under logarithmic source condition for nonlinear ill-posed problems. The regularization parameter is chosen according to the discrepancy principle. The reconstructions of the shape of an unknown domain for an inverse potential problem by using the modified Landweber method are exhibited.}, language = {en} } @article{Boeckmann1996, author = {B{\"o}ckmann, Christine}, title = {Curve fitting and identification of physical spectra}, year = {1996}, language = {en} } @article{Boeckmann1996, author = {B{\"o}ckmann, Christine}, title = {Curve fitting and identification of physical spectra}, year = {1996}, language = {en} } @book{Boeckmann1992, author = {B{\"o}ckmann, Christine}, title = {Curve fitting and identification of physical spectra}, series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik}, volume = {1992, 18}, journal = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik}, publisher = {Univ.}, address = {Potsdam}, pages = {17 Bl.}, year = {1992}, language = {en} } @article{Boeckmann2000, author = {B{\"o}ckmann, Christine}, title = {Evaluation of Multi-spectral Lidar Measurements of the Tropo- and Stratosphere via Modern Mathematical Methods for Inverse III- posed Problems to Determine the Aerosol Size Distribution}, year = {2000}, language = {en} }