![Frank Langbein](https://profiles-cardiff.imgix.net/attachments/1589?w=200&h=200&auto=format&crop=faces&fit=crop&q=90")
Dr Frank Langbein
Senior Lecturer
- Media commentator
- Available for postgraduate supervision
Overview
I am a senior lecturer in Computer Science at Cardiff University, where I am a member of the Visual Computing Research Section. I co-lead the Qyber\black international research network in quantum control, which arose from the Quantum Technologies and Engineering research priority area at Cardiff University, and the Healthcare Technologies Research Group at the School of Computer Science and Informatics.
My research interests lie in control, machine learning and geometry applied in quantum technologies, visual computing, geometric modelling and healthcare. My teaching responsibilities cover individual and group projects and various programming techniques.
See my website Ex Tenebris Scientia for recent results and full details.
Publication
2025
- Weidner, C. et al. 2025. Robust quantum control in closed and open systems: Theory and practice. Automatica 172, article number: 111987. (10.1016/j.automatica.2024.111987)
- Alwadee, E. J., Sun, X., Qin, Y. and Langbein, F. C. 2025. LATUP-Net: A lightweight 3D attention U-Net with parallel convolutions for brain tumor segmentation. Computers in Biology and Medicine 184, article number: 109353. (10.1016/j.compbiomed.2024.109353)
2024
- O'Neil, S. P., Weidner, C. A., Jonckheere, E. A., Langbein, F. C. and Schirmer, S. G. 2024. Robustness of dynamic quantum control: Differential sensitivity bounds. AVS Quantum Science 6(3), article number: 32001. (10.1116/5.0196110)
- Muftah, A., Shermer, S. and Langbein, F. 2024. Texture feature analysis for classification of early-stage prostate cancer in mpMRI. Presented at: First International Conference on Artificial Intelligence in Healthcare, Swansea, UK, 4-6 September 2024 Presented at Xie, X. et al. eds.Artificial Intelligence in Healthcare, Vol. 14976. Lecture Notes in Computer Science Vol. 14976. Springer, (10.1007/978-3-031-67285-9_9)
- Alwadee, E., Sun, X., Qin, Y. and Langbein, F. 2024. Assessing and enhancing the robustness of brain tumor segmentation using a probabilistic deep learning architecture. Presented at: 2024 ISMRM & ISMRT Annual Meeting & Exhibition, Singapore, 04-09 May 2024Proceedings 2024 ISMRM & ISMRT Annual Meeting & Exhibition. Vol. 4526. International Society for Magnetic Resonance in Medicine pp. 1-6.
- O'Neil, S., Schirmer, S., Langbein, F. C., Weidner, C. A. and Jonckheere, E. A. 2024. Time-domain sensitivity of the tracking error. IEEE Transactions on Automatic Control 69(4), pp. 2340-2351. (10.1109/TAC.2023.3331681)
2023
- O'Neil, S. P., Langbein, F. C., Jonckheere, E. and Shermer, S. 2023. Robustness of energy landscape control to dephasing. Research Directions: Quantum Technologies 1, article number: e13. (10.1017/qut.2023.6)
- O'Neil, S. P., Langbein, F. C., Jonckheere, E. and Shermer, S. 2023. Robustness of energy landscape controllers for spin rings under coherent excitation transport. Research Directions: Quantum Technologies 1, article number: e12. (10.1017/qut.2023.5)
- O'Neil, S. P., Khalid, I., Rompokos, A. A., Weidner, C. A., Langbein, F. C., Schirmer, S. and Jonckheere, E. A. 2023. Analyzing and unifying robustness measures for excitation transfer control in spin networks. IEEE Control Systems Letters 7, pp. 2475-1456. (10.1109/LCSYS.2023.3279797)
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Shermer, S. G. and Langbein, F. C. 2023. Sample-efficient model-based reinforcement learning for quantum control. [Online]. arXiv. (10.48550/arXiv.2304.09718) Available at: https://arxiv.org/abs/2304.09718
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Shermer, S. G. and Langbein, F. 2023. Statistically characterizing robustness and fidelity of quantum controls and quantum control algorithms. Physical Review A 107, article number: 32606. (10.1103/PhysRevA.107.032606)
2022
- Schirmer, S. G., Langbein, F. C., Weidner, C. A. and Jocnkheere, E. 2022. Robust control performance for open quantum systems. IEEE Transactions on Automatic Control 67(11), pp. 6012-6024. (10.1109/TAC.2022.3181249)
- Rompokos, A. A., Langbein, F. C. and Jonckheere, E. 2022. Information transfer in spintronics networks under worst case uncertain parameter errors. Presented at: IEEE 61st Conference on Decision and Control (CDC), Cancún, Mexico, 6-9 December 20222022 IEEE 61st Conference on Decision and Control (CDC). IEEE pp. 5824-5830., (10.1109/CDC51059.2022.9993088)
- Weidner, C. A., Schirmer, S. G., Langbein, F. C. and Jonckheere, E. 2022. Applying classical control techniques to quantum systems: entanglement versus stability margin and other limitations. Presented at: IEEE Conference Decision and Control 2022, Cancún, Mexico, 6-9 December 2022IEEE 61st Conference on Decision and Control (CDC). IEEE pp. 5813-5818., (10.1109/CDC51059.2022.9992337)
- Langbein, F. 2022. Finding and characterising robust quantum controls. Presented at: Bristol Quantum Information Technologies Workshop (BQIT 2022), Bristol, England, 25-28 April 2022.
2021
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Schirmer, S. G. and Langbein, F. C. 2021. Reinforcement learning vs. gradient-based optimisation for robust energy landscape control of spin-1/2 quantum networks. Presented at: 60th IEEE Conference of Decision and Control (CDC 2021), Austin, TX, USA, 13-15 December 2021.
- Schirmer, S. G., Langbein, F. C., Weidner, C. A. and Jonckheere, E. A. 2021. Robustness of quantum systems subject to decoherence: structured singular value analysis?. Presented at: 60th IEEE Conference of Decision and Control (CDC 2021), Austin, TX, USA, 13-15 December 2021.
- Langbein, F. 2021. Finding and characterising robust quantum controls. Presented at: 2nd European Quantum Technologies Virtual Conference (EQTC 2021), Virtual, 29 November - 02 December 2021.
- Langbein, F. C. 2021. Learning to control quantum systems robustly. Presented at: AI3SD Autumn Seminar 2021 - Quantum Machine Learning, Virtual, 10 November 2021.
2019
- Jenkins, C., Chandler, M., Langbein, F. and Shermer, S. 2019. Quantification of edited magnetic resonance spectroscopy: a comparative phantom based study of analysis methods. Presented at: ISMRM 27th Annual Meeting & Exhibition, Montréal, QC, Canada, 11-16 May 2019. pp. -.
- Jonckheere, E., Schirmer, S. and Langbein, F. 2019. Effect of quantum mechanical global phase factor on error vs sensitivity limitation in quantum routing. Presented at: 58th IEEE Conf. Decision and Control (CDC 2019), Nice, France, 11th-13th December 2019Proceedings of 58th IEEE Conf. Decision and Control (CDC 2019). IEEE
- Thorpe, B., Langbein, F., Schirmer, S. and Kalna, K. 2019. Temperature affected non-equilibrium spin transport in nanoscale In0.3Ga0.7As transistors. Presented at: 20th International Workshop on Computational Nanotechnology (IWCN), Evanston, IL, USA, 20-24 May 2019.
- Evans, J. E., Burwell, G., Langbein, F., Shermer, S. and Kalna, K. 2019. Dilute magnetic contact for a spin GaN HEMT. Presented at: Semiconductor and Integrated OptoElectronics Conference (SIOE) Conference, Cardiff, UK, 16-18 April 2019Semiconductor and Integrated OptoElectronics Conference (SIOE) Conference. pp. -.
- Thorpe, B., Langbein, F., Schirmer, S. and Kalna, K. 2019. Temperature affected non-equilibrium spin transport in nanoscale In0.3Ga0.7As transistors. Presented at: 20th International Workshop on Computational Nanotechnology (IWCN), Evanston, IL, USA, 20-24 May 2019.
2018
- Schirmer, S. G., Jonckheere, E. A. and Langbein, F. C. 2018. Design of feedback control laws for information transfer in spintronics networks. IEEE Transactions on Automatic Control 63(8), pp. 2523-2536. (10.1109/TAC.2017.2777187)
- Schirmer, S., Jonckheere, E., O'Neil, S. and Langbein, F. C. 2018. Robustness of energy landscape control for spin networks under decoherence. Presented at: IEEE 57th Annual Conference on Decision and Control (CDC), Miami Beach, FL, USA, 17-19 December 2018. IEEE
- Jonckheere, E., Schirmer, S. and Langbein, F. 2018. Jonckheere-Terpstra test for nonclassical error versus log-sensitivity relationship of quantum spin network controllers. International Journal of Robust and Nonlinear Control 28(6), pp. 2383-2403. (10.1002/rnc.4022)
- Rahimi, N., Kerfriden, P., Langbein, F. C. and Martin, R. R. 2018. CAD Model simplification error estimation for electrostatics problems. SIAM Journal on Scientific Computing 40(1), pp. B196-B227. (10.1137/16M1078641)
- O'Neil, S., Jonckheere, E., Schirmer, S. and Langbein, F. C. 2018. Sensitivity and robustness of quantum spin-1/2 rings to parameter uncertainty. Presented at: IEEE 56th Annual Conference on Decision and Control (CDC) 2017, Melbourne, Australia, 12-15 December 2017IEEE 56th Annual Conference on Decision and Control (CDC) 2017. IEEE pp. 6137-6142., (10.1109/CDC.2017.8264584)
2017
- Jonckheere, E. A., Schirmer, S. G. and Langbein, F. C. 2017. Structured singular value analysis for spintronics network information transfer control. IEEE Transactions on Automatic Control 62(12), pp. 6568-6574. (10.1109/TAC.2017.2714623)
- Thorpe, B., Kalna, K., Langbein, F. C. and Schirmer, S. 2017. Monte Carlo simulations of spin transport in a strained nanoscale InGaAs field effect transistor. Journal of Applied Physics 122(22), article number: 223903. (10.1063/1.4994148)
- Thorpe, B., Kalna, K., Langbein, F. C. and Schirmer, S. G. 2017. Spin recovery in the 25nm gate length InGaAs field effect transistore. Presented at: International Workshop on Computational Nanotechnology, Windermere, UK, 6-9 June 2017Proc. International Workshop on Computational Nanotechnology. pp. 168-169.
2015
- Jonckheere, E., Langbein, F. C. and Schirmer, S. G. 2015. Information transfer fidelity in spin networks and ring-based quantum routers. Quantum Information Processing 14, pp. 4751-4785. (10.1007/s11128-015-1136-4)
- Langbein, F. C., Schirmer, S. and Jonckheere, E. 2015. Time optimal information transfer in spintronics networks. Presented at: 2015 IEEE 54th Annual Conference on Decision and Control (CDC), Osaka, Japan, 15-18 December 20152015 IEEE 54th Annual Conference on Decision and Control (CDC) December 15-18, 2015. Osaka, Japan. IEEE pp. 6454-6459.
- Niu, Z., Martin, R. R., Langbein, F. C. and Sabin, M. A. 2015. Rapidly finding CAD features using database optimization. Computer-Aided Design 69, pp. 35-50. (10.1016/j.cad.2015.08.001)
- Schirmer, S. G. and Langbein, F. C. 2015. Ubiquitous problem of learning system parameters for dissipative two-level quantum systems: Fourier analysis versus Bayesian estimation. Physical Review A 91(2), pp. -., article number: 22125. (10.1103/PhysRevA.91.022125)
- Niu, Z., Martin, R. R., Sabin, M., Langbein, F. C. and Bucklow, H. 2015. Applying database optimization technologies to feature recognition in CAD. Computer-aided design and applications 12(3), pp. 373-382. (10.1080/16864360.2014.981468)
2014
- Jonckheere, E., Langbein, F. C. and Schirmer, S. 2014. Quantum networks: anti-core of spin chains. Quantum Information Processing 13, pp. 1607-1637. (10.1007/s11128-014-0755-5)
- Schirmer, S. and Langbein, F. C. 2014. Characterization and control of quantum spin chains and rings. Presented at: 2014 6th International Symposium on Communications, Control and Signal Processing (ISCCSP), Athens, 21 - 23 May 2014Communications, Control and Signal Processing (ISCCSP), 2014 6th International Symposium on. IEEE pp. 615-619., (10.1109/ISCCSP.2014.6877950)
2013
- Quinn, J. A., Langbein, F. C., Lai, Y. and Martin, R. R. 2013. Generalized anisotropic stratified surface sampling. IEEE Transactions on Visualization and Computer Graphics 19(7), pp. 1143-1157. (10.1109/TVCG.2012.305)
- Tam, G. K. L. et al. 2013. Registration of 3D point clouds and meshes: A survey from rigid to nonrigid. IEEE Transactions on Visualization and Computer Graphics 19(7), pp. 1199-1217. (10.1109/TVCG.2012.310)
- Wu, J. et al. 2013. Making bas-reliefs from photographs of human faces. Computer-Aided Design 45(3), pp. 671-682. (10.1016/j.cad.2012.11.002)
2012
- Quinn, J. A., Sun, F., Langbein, F. C., Lai, Y., Wang, W. and Martin, R. R. 2012. Improved initialisation for centroidal Voronoi tessellation and optimal Delaunay triangulation. Computer-Aided Design 44(11), pp. 1062-1071. (10.1016/j.cad.2012.05.002)
- Jonckheere, E., Langbein, F. C. and Schirmer, S. G. 2012. Curvature of quantum rings. Presented at: 5th International Symposium on Communications Control and Signal Processing (ISCCSP, Rome, Italy, 2-4 May 2012Communications Control and Signal Processing (ISCCSP), 2012 5th International Symposium on. IEEE pp. 1-6., (10.1109/ISCCSP.2012.6217863)
2011
- Jonckheere, E., Schirmer, S. G. and Langbein, F. C. 2011. Geometry and curvature of spin networks. Presented at: 2011 IEEE Multi-Conference on Systems and Control, Denver, CO, USA, 28-30 September 20112011 IEEE International Conference on Control Applications (CCA). Los Alamitos, CA: IEEE pp. 786-791., (10.1109/CCA.2011.6044395)
2010
- Li, M., Langbein, F. C. and Martin, R. R. 2010. Detecting design intent in approximate CAD models using symmetry. Computer-Aided Design 42(3), pp. 183-201. (10.1016/j.cad.2009.10.001)
- Li, W., Martin, R. R. and Langbein, F. C. 2010. Merging and smoothing machining boundaries on cutter location surfaces. Presented at: 14th ACM Symposium on Solid and Physical Modeling, Haifa, Israel, 1-3 September 2010 Presented at Keyser, J. and Kim, M. eds.Proceedings of the 14th ACM Symposium on Solid and Physical Modeling, 1-3 September 2010, Haifa, Israel. New York: ACM pp. 165-170., (10.1145/1839778.1839803)
- Schirmer, S. G. and Langbein, F. C. 2010. Quantum system identification: Hamiltonian estimation using spectral and Bayesian analysis. Presented at: 4th International Symposium on Communications, Control and Signal Processing (ISCCSP 2010), Limassol, Cyprus, 3-5 March 2010 Presented at Constantinides, A. G. and Mitra, S. K. eds.Proceedings of the 4th International Symposium on Communications, Control and Signal Processing (ISCCSP) 2010. Los Alamitos, CA: IEEE, (10.1109/ISCCSP.2010.5463437)
2009
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Random walks for feature-preserving mesh denoising. Computer Aided Geometric Design 25(7), pp. 437-456. (10.1016/j.cagd.2007.12.008)
- Li, W., Martin, R. R. and Langbein, F. C. 2009. Molds for meshes: computing smooth parting lines and undercut removal. IEEE Transactions on Automation Science and Engineering 6(3), pp. 423-432. (10.1109/TASE.2009.2021324)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Noise analysis and synthesis for 3D laser depth scanners. Graphical Models 71(2), pp. 34-48. (10.1016/j.gmod.2008.12.002)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Bas-relief generation using adaptive histogram equalization. IEEE Transactions on Visualization and Computer Graphics 15(4), pp. 642-653. (10.1109/TVCG.2009.21)
2008
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2008. Noise in 3D laser range scanner data. Presented at: 10th International Conference on Shape Modeling and Applications, Stony Brook, NY, USA, 4-6 June 2008 Presented at Michela Spagnuolo, M., Cohen-Or;, D. and Gu, X. D. G. eds.Shape Modeling and Applications, 2008. SMI 2008. IEEE International Conference. Los Alamitos, CA: IEEE Computer Society pp. 37-45., (10.1109/SMI.2008.4547945)
- Langbein, F. C., Li, M. and Martin, R. R. 2008. A comment on 'constructing regularity feature trees for solid models'. Lecture Notes in Computer Science 4975, pp. 603. (10.1007/978-3-540-79246-8_53)
- Li, M., Langbein, F. C. and Martin, R. R. 2008. Detecting approximate symmetries of discrete point subsets. Computer-Aided Design 40(1), pp. 76-93. (10.1016/j.cad.2007.06.007)
2007
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2007. Fast and Effective Feature-Preserving Mesh Denoising. IEEE Transactions on Visualization and Computer Graphics 13(5), pp. 925-938. (10.1109/TVCG.2007.1065)
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Background surface estimation for reverse engineering of reliefs. International Journal of CAD/CAM 7(1), pp. 1-17.
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Segmenting geometric reliefs from textured background surfaces. Computer-aided design and applications 4(5), pp. 565-583.
- Li, M., Langbein, F. C. and Martin, R. R. 2007. Detecting approximate incomplete symmetries in discrete point sets. Presented at: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007 : ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 335-340., (10.1145/1236246.1236294)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2007. Random walks for mesh denoising. Presented at: SPM 2007: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007 : ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 11-22., (10.1145/1236246.1236252)
- Li, W., Martin, R. R. and Langbein, F. C. 2007. Generating smooth parting lines for mold design for meshes. Presented at: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007: ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 193-204., (10.1145/1236246.1236274)
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Segmenting periodic reliefs on triangle meshes. Presented at: 12th IMA International Conference, Sheffield, UK, 4-6 September 2007Mathematics of surfaces XII : 12th IMA international conference, Sheffield, UK, September 4-6, 2007 : proceedings. Lecture notes in computer science Vol. 4647. Berlin, Germany: Springer pp. 290-306., (10.1007/978-3-540-73843-5_18)
- Quinn, J. A., Langbein, F. C. and Martin, R. R. 2007. Low-discrepancy point sampling of meshes for rendering. Presented at: Eurographics/IEEE VGTC Symposium on Point-based graphics 2007, Prague, Czech Republic, 2-3 September 2007Point-based graphics 2007 : Eurographics/IEEE VGTC Symposium proceedings, Prague, Czech Republic, September 2-3, 2007. Aire-la-Ville, Switzerland: Eurographics pp. 19-28., (10.2312/SPBG/SPBG07/019-028)
2006
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2006. Segmenting reliefs on triangle meshes. Presented at: SPM 2006: ACM Symposium on Solid and Physical Modeling, Cardiff, UK, 6-8 June 2006Proceedings, SPM 2006 : ACM Symposium on Solid and Physical Modeling : Cardiff, Wales, United Kingdom, June 06-08, 2006, Vol. SPM06. New York, USA: Association for Computing Machinery pp. 7-16., (10.1145/1128888.1128890)
- Li, M., Langbein, F. C. and Martin, R. R. 2006. Constructing regularity feature trees for solid models. Presented at: Geometric Modeling and Processing (GMP 2006), Pittsburgh, PA, USA, 26-28 July 2006 Presented at Kim, M. S. and Shimada, K. eds.Geometric Modeling and Processing-GMP 2006. Lecture notes in computer science Vol. 4077. Berlin-Heidelberg: Springer Verlag pp. 267-286., (10.1007/11802914_19)
- Quinn, J. A., Langbein, F. C., Martin, R. R. and Elber, G. 2006. Density-controlled sampling of parametric surfaces using adaptive space-filling curves. Presented at: Geometric Modeling and Processing (GMP 2006), Pittsburgh, PA, USA, 26-28 July 2006 Presented at Kim, M. and Shimada, K. eds.Geometric Modeling and Processing - GMP 2006. Lecture notes in computer science Vol. 4077. Berlin-Heidelberg: Springer Verlag pp. 465-484., (10.1007/11802914_33)
2004
- Langbein, F. C., Marshall, A. D. and Martin, R. R. 2004. Choosing Consistent Constraints for Beautification of Reverse Engineered Geometric Models. Computer-Aided Design 36(3), pp. 261-278. (10.1016/S0010-4485(03)00108-8)
- Langbein, F. C., Gao, C. H., Mills, B. I., Marshall, A. D. and Martin, R. R. 2004. Topological and geometric beautification of reverse engineered geometric models. Presented at: 9th ACM Symposium on Solid Modeling and Applications, Genoa, Italy, 9-11 June 2004 Presented at Fellner, D. W. et al. eds.Solid Modeling 2004. Aire- la- Ville, Switzerland: Eurographics Association pp. 255-260.
- Gao, C. H., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2004. Local topological beautification of reverse engineered models. Computer-Aided Design 36(13), pp. 1337-1355. (10.1016/j.cad.2004.02.004)
- Gao, C., Langbein, F. C., Marshall, A. D., Martin, R. R., Li, Y. and Yang, Z. 2004. Partial approximate symmetry detection of geometric model. Materials Science Forum 471/2, pp. 702-706. (10.4028/www.scientific.net/MSF.471-472.702)
2003
- Gao, C., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2003. Approximate congruence detection of model features for reverse engineering. Presented at: Shape Modeling International Conference 2003, 12-15 May 2003Proceedings of the Shape Modeling International Conference 2003. IEEE pp. 69-77., (10.1109/SMI.2003.1199603)
2002
- Langbein, F. C., Marshall, A. D. and Martin, R. R. 2002. Numerical methods for beautification of reverse engineered geometric models. Presented at: Geometric Modeling and Processing, Wako, Saitama, Japan, 10-12 July 2002Proceedings of Geometric Modeling and Processing. IEEE pp. 159-168., (10.1109/GMAP.2002.1027507)
2001
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Approximate Geometric Regularities. International Journal of Shape Modeling 7(2), pp. 129-162. (10.1142/S0218654301000096)
- Mills, B. I., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2001. Approximate Symmetry Detection for Reverse Engineering. Presented at: Proceedings of the 6th ACM Symposium on Solid Modeling and Applications. , (10.1145/376957.376985)
- Langbein, F. C., Mills, B., Marshall, A. D. and Martin, R. R. 2001. Finding approximate shape regularities for reverse engineering. Journal of Computing and Information Science in Engineering 1(4), pp. 282-290. (10.1115/1.1430232)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Finding approximate shape regularities in reverse engineered solid models bounded by simple surfaces. Presented at: ACM Symposium on Solid and Physical Modeling, Ann Arbor, MI, USA, 4-8 June 2001 Presented at Anderson, D. C. ed.Proceedings of the sixth ACM symposium on Solid modeling and applications (SMA '01). New York: ACM pp. 206-215., (10.1145/376957.376981)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Recognizing geometric patterns for beautification of reconstructed solid models. Presented at: SMI 2001 International Conference on Shape Modeling and Applications, Genova, Italy, 7-11 May 2001Proceedings of the SMI 2001 International Conference on Shape Modeling and Applications. IEEE pp. 10-19., (10.1109/SMA.2001.923370)
Articles
- Weidner, C. et al. 2025. Robust quantum control in closed and open systems: Theory and practice. Automatica 172, article number: 111987. (10.1016/j.automatica.2024.111987)
- Alwadee, E. J., Sun, X., Qin, Y. and Langbein, F. C. 2025. LATUP-Net: A lightweight 3D attention U-Net with parallel convolutions for brain tumor segmentation. Computers in Biology and Medicine 184, article number: 109353. (10.1016/j.compbiomed.2024.109353)
- O'Neil, S. P., Weidner, C. A., Jonckheere, E. A., Langbein, F. C. and Schirmer, S. G. 2024. Robustness of dynamic quantum control: Differential sensitivity bounds. AVS Quantum Science 6(3), article number: 32001. (10.1116/5.0196110)
- O'Neil, S., Schirmer, S., Langbein, F. C., Weidner, C. A. and Jonckheere, E. A. 2024. Time-domain sensitivity of the tracking error. IEEE Transactions on Automatic Control 69(4), pp. 2340-2351. (10.1109/TAC.2023.3331681)
- O'Neil, S. P., Langbein, F. C., Jonckheere, E. and Shermer, S. 2023. Robustness of energy landscape control to dephasing. Research Directions: Quantum Technologies 1, article number: e13. (10.1017/qut.2023.6)
- O'Neil, S. P., Langbein, F. C., Jonckheere, E. and Shermer, S. 2023. Robustness of energy landscape controllers for spin rings under coherent excitation transport. Research Directions: Quantum Technologies 1, article number: e12. (10.1017/qut.2023.5)
- O'Neil, S. P., Khalid, I., Rompokos, A. A., Weidner, C. A., Langbein, F. C., Schirmer, S. and Jonckheere, E. A. 2023. Analyzing and unifying robustness measures for excitation transfer control in spin networks. IEEE Control Systems Letters 7, pp. 2475-1456. (10.1109/LCSYS.2023.3279797)
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Shermer, S. G. and Langbein, F. 2023. Statistically characterizing robustness and fidelity of quantum controls and quantum control algorithms. Physical Review A 107, article number: 32606. (10.1103/PhysRevA.107.032606)
- Schirmer, S. G., Langbein, F. C., Weidner, C. A. and Jocnkheere, E. 2022. Robust control performance for open quantum systems. IEEE Transactions on Automatic Control 67(11), pp. 6012-6024. (10.1109/TAC.2022.3181249)
- Schirmer, S. G., Jonckheere, E. A. and Langbein, F. C. 2018. Design of feedback control laws for information transfer in spintronics networks. IEEE Transactions on Automatic Control 63(8), pp. 2523-2536. (10.1109/TAC.2017.2777187)
- Jonckheere, E., Schirmer, S. and Langbein, F. 2018. Jonckheere-Terpstra test for nonclassical error versus log-sensitivity relationship of quantum spin network controllers. International Journal of Robust and Nonlinear Control 28(6), pp. 2383-2403. (10.1002/rnc.4022)
- Rahimi, N., Kerfriden, P., Langbein, F. C. and Martin, R. R. 2018. CAD Model simplification error estimation for electrostatics problems. SIAM Journal on Scientific Computing 40(1), pp. B196-B227. (10.1137/16M1078641)
- Jonckheere, E. A., Schirmer, S. G. and Langbein, F. C. 2017. Structured singular value analysis for spintronics network information transfer control. IEEE Transactions on Automatic Control 62(12), pp. 6568-6574. (10.1109/TAC.2017.2714623)
- Thorpe, B., Kalna, K., Langbein, F. C. and Schirmer, S. 2017. Monte Carlo simulations of spin transport in a strained nanoscale InGaAs field effect transistor. Journal of Applied Physics 122(22), article number: 223903. (10.1063/1.4994148)
- Jonckheere, E., Langbein, F. C. and Schirmer, S. G. 2015. Information transfer fidelity in spin networks and ring-based quantum routers. Quantum Information Processing 14, pp. 4751-4785. (10.1007/s11128-015-1136-4)
- Niu, Z., Martin, R. R., Langbein, F. C. and Sabin, M. A. 2015. Rapidly finding CAD features using database optimization. Computer-Aided Design 69, pp. 35-50. (10.1016/j.cad.2015.08.001)
- Schirmer, S. G. and Langbein, F. C. 2015. Ubiquitous problem of learning system parameters for dissipative two-level quantum systems: Fourier analysis versus Bayesian estimation. Physical Review A 91(2), pp. -., article number: 22125. (10.1103/PhysRevA.91.022125)
- Niu, Z., Martin, R. R., Sabin, M., Langbein, F. C. and Bucklow, H. 2015. Applying database optimization technologies to feature recognition in CAD. Computer-aided design and applications 12(3), pp. 373-382. (10.1080/16864360.2014.981468)
- Jonckheere, E., Langbein, F. C. and Schirmer, S. 2014. Quantum networks: anti-core of spin chains. Quantum Information Processing 13, pp. 1607-1637. (10.1007/s11128-014-0755-5)
- Quinn, J. A., Langbein, F. C., Lai, Y. and Martin, R. R. 2013. Generalized anisotropic stratified surface sampling. IEEE Transactions on Visualization and Computer Graphics 19(7), pp. 1143-1157. (10.1109/TVCG.2012.305)
- Tam, G. K. L. et al. 2013. Registration of 3D point clouds and meshes: A survey from rigid to nonrigid. IEEE Transactions on Visualization and Computer Graphics 19(7), pp. 1199-1217. (10.1109/TVCG.2012.310)
- Wu, J. et al. 2013. Making bas-reliefs from photographs of human faces. Computer-Aided Design 45(3), pp. 671-682. (10.1016/j.cad.2012.11.002)
- Quinn, J. A., Sun, F., Langbein, F. C., Lai, Y., Wang, W. and Martin, R. R. 2012. Improved initialisation for centroidal Voronoi tessellation and optimal Delaunay triangulation. Computer-Aided Design 44(11), pp. 1062-1071. (10.1016/j.cad.2012.05.002)
- Li, M., Langbein, F. C. and Martin, R. R. 2010. Detecting design intent in approximate CAD models using symmetry. Computer-Aided Design 42(3), pp. 183-201. (10.1016/j.cad.2009.10.001)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Random walks for feature-preserving mesh denoising. Computer Aided Geometric Design 25(7), pp. 437-456. (10.1016/j.cagd.2007.12.008)
- Li, W., Martin, R. R. and Langbein, F. C. 2009. Molds for meshes: computing smooth parting lines and undercut removal. IEEE Transactions on Automation Science and Engineering 6(3), pp. 423-432. (10.1109/TASE.2009.2021324)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Noise analysis and synthesis for 3D laser depth scanners. Graphical Models 71(2), pp. 34-48. (10.1016/j.gmod.2008.12.002)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Bas-relief generation using adaptive histogram equalization. IEEE Transactions on Visualization and Computer Graphics 15(4), pp. 642-653. (10.1109/TVCG.2009.21)
- Langbein, F. C., Li, M. and Martin, R. R. 2008. A comment on 'constructing regularity feature trees for solid models'. Lecture Notes in Computer Science 4975, pp. 603. (10.1007/978-3-540-79246-8_53)
- Li, M., Langbein, F. C. and Martin, R. R. 2008. Detecting approximate symmetries of discrete point subsets. Computer-Aided Design 40(1), pp. 76-93. (10.1016/j.cad.2007.06.007)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2007. Fast and Effective Feature-Preserving Mesh Denoising. IEEE Transactions on Visualization and Computer Graphics 13(5), pp. 925-938. (10.1109/TVCG.2007.1065)
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Background surface estimation for reverse engineering of reliefs. International Journal of CAD/CAM 7(1), pp. 1-17.
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Segmenting geometric reliefs from textured background surfaces. Computer-aided design and applications 4(5), pp. 565-583.
- Langbein, F. C., Marshall, A. D. and Martin, R. R. 2004. Choosing Consistent Constraints for Beautification of Reverse Engineered Geometric Models. Computer-Aided Design 36(3), pp. 261-278. (10.1016/S0010-4485(03)00108-8)
- Gao, C. H., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2004. Local topological beautification of reverse engineered models. Computer-Aided Design 36(13), pp. 1337-1355. (10.1016/j.cad.2004.02.004)
- Gao, C., Langbein, F. C., Marshall, A. D., Martin, R. R., Li, Y. and Yang, Z. 2004. Partial approximate symmetry detection of geometric model. Materials Science Forum 471/2, pp. 702-706. (10.4028/www.scientific.net/MSF.471-472.702)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Approximate Geometric Regularities. International Journal of Shape Modeling 7(2), pp. 129-162. (10.1142/S0218654301000096)
- Langbein, F. C., Mills, B., Marshall, A. D. and Martin, R. R. 2001. Finding approximate shape regularities for reverse engineering. Journal of Computing and Information Science in Engineering 1(4), pp. 282-290. (10.1115/1.1430232)
Conferences
- Muftah, A., Shermer, S. and Langbein, F. 2024. Texture feature analysis for classification of early-stage prostate cancer in mpMRI. Presented at: First International Conference on Artificial Intelligence in Healthcare, Swansea, UK, 4-6 September 2024 Presented at Xie, X. et al. eds.Artificial Intelligence in Healthcare, Vol. 14976. Lecture Notes in Computer Science Vol. 14976. Springer, (10.1007/978-3-031-67285-9_9)
- Alwadee, E., Sun, X., Qin, Y. and Langbein, F. 2024. Assessing and enhancing the robustness of brain tumor segmentation using a probabilistic deep learning architecture. Presented at: 2024 ISMRM & ISMRT Annual Meeting & Exhibition, Singapore, 04-09 May 2024Proceedings 2024 ISMRM & ISMRT Annual Meeting & Exhibition. Vol. 4526. International Society for Magnetic Resonance in Medicine pp. 1-6.
- Rompokos, A. A., Langbein, F. C. and Jonckheere, E. 2022. Information transfer in spintronics networks under worst case uncertain parameter errors. Presented at: IEEE 61st Conference on Decision and Control (CDC), Cancún, Mexico, 6-9 December 20222022 IEEE 61st Conference on Decision and Control (CDC). IEEE pp. 5824-5830., (10.1109/CDC51059.2022.9993088)
- Weidner, C. A., Schirmer, S. G., Langbein, F. C. and Jonckheere, E. 2022. Applying classical control techniques to quantum systems: entanglement versus stability margin and other limitations. Presented at: IEEE Conference Decision and Control 2022, Cancún, Mexico, 6-9 December 2022IEEE 61st Conference on Decision and Control (CDC). IEEE pp. 5813-5818., (10.1109/CDC51059.2022.9992337)
- Langbein, F. 2022. Finding and characterising robust quantum controls. Presented at: Bristol Quantum Information Technologies Workshop (BQIT 2022), Bristol, England, 25-28 April 2022.
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Schirmer, S. G. and Langbein, F. C. 2021. Reinforcement learning vs. gradient-based optimisation for robust energy landscape control of spin-1/2 quantum networks. Presented at: 60th IEEE Conference of Decision and Control (CDC 2021), Austin, TX, USA, 13-15 December 2021.
- Schirmer, S. G., Langbein, F. C., Weidner, C. A. and Jonckheere, E. A. 2021. Robustness of quantum systems subject to decoherence: structured singular value analysis?. Presented at: 60th IEEE Conference of Decision and Control (CDC 2021), Austin, TX, USA, 13-15 December 2021.
- Langbein, F. 2021. Finding and characterising robust quantum controls. Presented at: 2nd European Quantum Technologies Virtual Conference (EQTC 2021), Virtual, 29 November - 02 December 2021.
- Langbein, F. C. 2021. Learning to control quantum systems robustly. Presented at: AI3SD Autumn Seminar 2021 - Quantum Machine Learning, Virtual, 10 November 2021.
- Jenkins, C., Chandler, M., Langbein, F. and Shermer, S. 2019. Quantification of edited magnetic resonance spectroscopy: a comparative phantom based study of analysis methods. Presented at: ISMRM 27th Annual Meeting & Exhibition, Montréal, QC, Canada, 11-16 May 2019. pp. -.
- Jonckheere, E., Schirmer, S. and Langbein, F. 2019. Effect of quantum mechanical global phase factor on error vs sensitivity limitation in quantum routing. Presented at: 58th IEEE Conf. Decision and Control (CDC 2019), Nice, France, 11th-13th December 2019Proceedings of 58th IEEE Conf. Decision and Control (CDC 2019). IEEE
- Thorpe, B., Langbein, F., Schirmer, S. and Kalna, K. 2019. Temperature affected non-equilibrium spin transport in nanoscale In0.3Ga0.7As transistors. Presented at: 20th International Workshop on Computational Nanotechnology (IWCN), Evanston, IL, USA, 20-24 May 2019.
- Evans, J. E., Burwell, G., Langbein, F., Shermer, S. and Kalna, K. 2019. Dilute magnetic contact for a spin GaN HEMT. Presented at: Semiconductor and Integrated OptoElectronics Conference (SIOE) Conference, Cardiff, UK, 16-18 April 2019Semiconductor and Integrated OptoElectronics Conference (SIOE) Conference. pp. -.
- Thorpe, B., Langbein, F., Schirmer, S. and Kalna, K. 2019. Temperature affected non-equilibrium spin transport in nanoscale In0.3Ga0.7As transistors. Presented at: 20th International Workshop on Computational Nanotechnology (IWCN), Evanston, IL, USA, 20-24 May 2019.
- Schirmer, S., Jonckheere, E., O'Neil, S. and Langbein, F. C. 2018. Robustness of energy landscape control for spin networks under decoherence. Presented at: IEEE 57th Annual Conference on Decision and Control (CDC), Miami Beach, FL, USA, 17-19 December 2018. IEEE
- O'Neil, S., Jonckheere, E., Schirmer, S. and Langbein, F. C. 2018. Sensitivity and robustness of quantum spin-1/2 rings to parameter uncertainty. Presented at: IEEE 56th Annual Conference on Decision and Control (CDC) 2017, Melbourne, Australia, 12-15 December 2017IEEE 56th Annual Conference on Decision and Control (CDC) 2017. IEEE pp. 6137-6142., (10.1109/CDC.2017.8264584)
- Thorpe, B., Kalna, K., Langbein, F. C. and Schirmer, S. G. 2017. Spin recovery in the 25nm gate length InGaAs field effect transistore. Presented at: International Workshop on Computational Nanotechnology, Windermere, UK, 6-9 June 2017Proc. International Workshop on Computational Nanotechnology. pp. 168-169.
- Langbein, F. C., Schirmer, S. and Jonckheere, E. 2015. Time optimal information transfer in spintronics networks. Presented at: 2015 IEEE 54th Annual Conference on Decision and Control (CDC), Osaka, Japan, 15-18 December 20152015 IEEE 54th Annual Conference on Decision and Control (CDC) December 15-18, 2015. Osaka, Japan. IEEE pp. 6454-6459.
- Schirmer, S. and Langbein, F. C. 2014. Characterization and control of quantum spin chains and rings. Presented at: 2014 6th International Symposium on Communications, Control and Signal Processing (ISCCSP), Athens, 21 - 23 May 2014Communications, Control and Signal Processing (ISCCSP), 2014 6th International Symposium on. IEEE pp. 615-619., (10.1109/ISCCSP.2014.6877950)
- Jonckheere, E., Langbein, F. C. and Schirmer, S. G. 2012. Curvature of quantum rings. Presented at: 5th International Symposium on Communications Control and Signal Processing (ISCCSP, Rome, Italy, 2-4 May 2012Communications Control and Signal Processing (ISCCSP), 2012 5th International Symposium on. IEEE pp. 1-6., (10.1109/ISCCSP.2012.6217863)
- Jonckheere, E., Schirmer, S. G. and Langbein, F. C. 2011. Geometry and curvature of spin networks. Presented at: 2011 IEEE Multi-Conference on Systems and Control, Denver, CO, USA, 28-30 September 20112011 IEEE International Conference on Control Applications (CCA). Los Alamitos, CA: IEEE pp. 786-791., (10.1109/CCA.2011.6044395)
- Li, W., Martin, R. R. and Langbein, F. C. 2010. Merging and smoothing machining boundaries on cutter location surfaces. Presented at: 14th ACM Symposium on Solid and Physical Modeling, Haifa, Israel, 1-3 September 2010 Presented at Keyser, J. and Kim, M. eds.Proceedings of the 14th ACM Symposium on Solid and Physical Modeling, 1-3 September 2010, Haifa, Israel. New York: ACM pp. 165-170., (10.1145/1839778.1839803)
- Schirmer, S. G. and Langbein, F. C. 2010. Quantum system identification: Hamiltonian estimation using spectral and Bayesian analysis. Presented at: 4th International Symposium on Communications, Control and Signal Processing (ISCCSP 2010), Limassol, Cyprus, 3-5 March 2010 Presented at Constantinides, A. G. and Mitra, S. K. eds.Proceedings of the 4th International Symposium on Communications, Control and Signal Processing (ISCCSP) 2010. Los Alamitos, CA: IEEE, (10.1109/ISCCSP.2010.5463437)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2008. Noise in 3D laser range scanner data. Presented at: 10th International Conference on Shape Modeling and Applications, Stony Brook, NY, USA, 4-6 June 2008 Presented at Michela Spagnuolo, M., Cohen-Or;, D. and Gu, X. D. G. eds.Shape Modeling and Applications, 2008. SMI 2008. IEEE International Conference. Los Alamitos, CA: IEEE Computer Society pp. 37-45., (10.1109/SMI.2008.4547945)
- Li, M., Langbein, F. C. and Martin, R. R. 2007. Detecting approximate incomplete symmetries in discrete point sets. Presented at: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007 : ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 335-340., (10.1145/1236246.1236294)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2007. Random walks for mesh denoising. Presented at: SPM 2007: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007 : ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 11-22., (10.1145/1236246.1236252)
- Li, W., Martin, R. R. and Langbein, F. C. 2007. Generating smooth parting lines for mold design for meshes. Presented at: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007: ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 193-204., (10.1145/1236246.1236274)
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2007. Segmenting periodic reliefs on triangle meshes. Presented at: 12th IMA International Conference, Sheffield, UK, 4-6 September 2007Mathematics of surfaces XII : 12th IMA international conference, Sheffield, UK, September 4-6, 2007 : proceedings. Lecture notes in computer science Vol. 4647. Berlin, Germany: Springer pp. 290-306., (10.1007/978-3-540-73843-5_18)
- Quinn, J. A., Langbein, F. C. and Martin, R. R. 2007. Low-discrepancy point sampling of meshes for rendering. Presented at: Eurographics/IEEE VGTC Symposium on Point-based graphics 2007, Prague, Czech Republic, 2-3 September 2007Point-based graphics 2007 : Eurographics/IEEE VGTC Symposium proceedings, Prague, Czech Republic, September 2-3, 2007. Aire-la-Ville, Switzerland: Eurographics pp. 19-28., (10.2312/SPBG/SPBG07/019-028)
- Liu, S., Martin, R. R., Langbein, F. C. and Rosin, P. L. 2006. Segmenting reliefs on triangle meshes. Presented at: SPM 2006: ACM Symposium on Solid and Physical Modeling, Cardiff, UK, 6-8 June 2006Proceedings, SPM 2006 : ACM Symposium on Solid and Physical Modeling : Cardiff, Wales, United Kingdom, June 06-08, 2006, Vol. SPM06. New York, USA: Association for Computing Machinery pp. 7-16., (10.1145/1128888.1128890)
- Li, M., Langbein, F. C. and Martin, R. R. 2006. Constructing regularity feature trees for solid models. Presented at: Geometric Modeling and Processing (GMP 2006), Pittsburgh, PA, USA, 26-28 July 2006 Presented at Kim, M. S. and Shimada, K. eds.Geometric Modeling and Processing-GMP 2006. Lecture notes in computer science Vol. 4077. Berlin-Heidelberg: Springer Verlag pp. 267-286., (10.1007/11802914_19)
- Quinn, J. A., Langbein, F. C., Martin, R. R. and Elber, G. 2006. Density-controlled sampling of parametric surfaces using adaptive space-filling curves. Presented at: Geometric Modeling and Processing (GMP 2006), Pittsburgh, PA, USA, 26-28 July 2006 Presented at Kim, M. and Shimada, K. eds.Geometric Modeling and Processing - GMP 2006. Lecture notes in computer science Vol. 4077. Berlin-Heidelberg: Springer Verlag pp. 465-484., (10.1007/11802914_33)
- Langbein, F. C., Gao, C. H., Mills, B. I., Marshall, A. D. and Martin, R. R. 2004. Topological and geometric beautification of reverse engineered geometric models. Presented at: 9th ACM Symposium on Solid Modeling and Applications, Genoa, Italy, 9-11 June 2004 Presented at Fellner, D. W. et al. eds.Solid Modeling 2004. Aire- la- Ville, Switzerland: Eurographics Association pp. 255-260.
- Gao, C., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2003. Approximate congruence detection of model features for reverse engineering. Presented at: Shape Modeling International Conference 2003, 12-15 May 2003Proceedings of the Shape Modeling International Conference 2003. IEEE pp. 69-77., (10.1109/SMI.2003.1199603)
- Langbein, F. C., Marshall, A. D. and Martin, R. R. 2002. Numerical methods for beautification of reverse engineered geometric models. Presented at: Geometric Modeling and Processing, Wako, Saitama, Japan, 10-12 July 2002Proceedings of Geometric Modeling and Processing. IEEE pp. 159-168., (10.1109/GMAP.2002.1027507)
- Mills, B. I., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2001. Approximate Symmetry Detection for Reverse Engineering. Presented at: Proceedings of the 6th ACM Symposium on Solid Modeling and Applications. , (10.1145/376957.376985)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Finding approximate shape regularities in reverse engineered solid models bounded by simple surfaces. Presented at: ACM Symposium on Solid and Physical Modeling, Ann Arbor, MI, USA, 4-8 June 2001 Presented at Anderson, D. C. ed.Proceedings of the sixth ACM symposium on Solid modeling and applications (SMA '01). New York: ACM pp. 206-215., (10.1145/376957.376981)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Recognizing geometric patterns for beautification of reconstructed solid models. Presented at: SMI 2001 International Conference on Shape Modeling and Applications, Genova, Italy, 7-11 May 2001Proceedings of the SMI 2001 International Conference on Shape Modeling and Applications. IEEE pp. 10-19., (10.1109/SMA.2001.923370)
Websites
- Khalid, I., Weidner, C. A., Jonckheere, E. A., Shermer, S. G. and Langbein, F. C. 2023. Sample-efficient model-based reinforcement learning for quantum control. [Online]. arXiv. (10.48550/arXiv.2304.09718) Available at: https://arxiv.org/abs/2304.09718
- Quinn, J. A., Sun, F., Langbein, F. C., Lai, Y., Wang, W. and Martin, R. R. 2012. Improved initialisation for centroidal Voronoi tessellation and optimal Delaunay triangulation. Computer-Aided Design 44(11), pp. 1062-1071. (10.1016/j.cad.2012.05.002)
- Li, M., Langbein, F. C. and Martin, R. R. 2010. Detecting design intent in approximate CAD models using symmetry. Computer-Aided Design 42(3), pp. 183-201. (10.1016/j.cad.2009.10.001)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Random walks for feature-preserving mesh denoising. Computer Aided Geometric Design 25(7), pp. 437-456. (10.1016/j.cagd.2007.12.008)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2009. Bas-relief generation using adaptive histogram equalization. IEEE Transactions on Visualization and Computer Graphics 15(4), pp. 642-653. (10.1109/TVCG.2009.21)
- Li, M., Langbein, F. C. and Martin, R. R. 2008. Detecting approximate symmetries of discrete point subsets. Computer-Aided Design 40(1), pp. 76-93. (10.1016/j.cad.2007.06.007)
- Sun, X., Rosin, P. L., Martin, R. R. and Langbein, F. C. 2007. Fast and Effective Feature-Preserving Mesh Denoising. IEEE Transactions on Visualization and Computer Graphics 13(5), pp. 925-938. (10.1109/TVCG.2007.1065)
- Li, M., Langbein, F. C. and Martin, R. R. 2007. Detecting approximate incomplete symmetries in discrete point sets. Presented at: ACM Symposium on Solid and Physical Modeling, Beijing, China, 4-6 June 2007Proceedings, SPM 2007 : ACM Symposium on Solid and Physical Modeling : Beijing, China, June 04-06, 2007. New York, USA: Association for Computing Machinery pp. 335-340., (10.1145/1236246.1236294)
- Quinn, J. A., Langbein, F. C. and Martin, R. R. 2007. Low-discrepancy point sampling of meshes for rendering. Presented at: Eurographics/IEEE VGTC Symposium on Point-based graphics 2007, Prague, Czech Republic, 2-3 September 2007Point-based graphics 2007 : Eurographics/IEEE VGTC Symposium proceedings, Prague, Czech Republic, September 2-3, 2007. Aire-la-Ville, Switzerland: Eurographics pp. 19-28., (10.2312/SPBG/SPBG07/019-028)
- Langbein, F. C., Marshall, A. D. and Martin, R. R. 2004. Choosing Consistent Constraints for Beautification of Reverse Engineered Geometric Models. Computer-Aided Design 36(3), pp. 261-278. (10.1016/S0010-4485(03)00108-8)
- Langbein, F. C., Mills, B. I., Marshall, A. D. and Martin, R. R. 2001. Approximate Geometric Regularities. International Journal of Shape Modeling 7(2), pp. 129-162. (10.1142/S0218654301000096)
- Mills, B. I., Langbein, F. C., Marshall, A. D. and Martin, R. R. 2001. Approximate Symmetry Detection for Reverse Engineering. Presented at: Proceedings of the 6th ACM Symposium on Solid Modeling and Applications. , (10.1145/376957.376985)
Research
My research interests lie in control, machine learning and geometry applied in quantum technologies, geometric modelling, computer graphics, computer vision and healthcare.
My current work is focused on robust quantum control, developing a theory of robust, controlled quantum processes and associated algorithms to find and analyse such controls. It includes work on optimisation and reinforcement learning approaches as well as process tomography and simulation techniques. Initially focused on quantum information transfer, it has been expanded to quantum simulation and computing. The approaches are relevant to a wide range of hardware platforms, e.g., ultra-cold atoms, ion traps and superconducting circuits.
I also work on robust quantum control and machine learning techniques to improve magnetic resonance imaging and spectroscopy. A specific aim is to improve the accuracy of in-vivo quantification of metabolites by developing algorithms to find chemically specific pulse sequences and quantify metabolites in the resulting spectra. I am further interested in learning physical laws and constructing control models from empirical data for biochemical and quantum processes.
Moreover, my work encompasses geometric and solid modelling, processing of meshes, curves and surfaces, pattern recognition, graphics, and computational geometry. Special interests include point-based modelling, design intent of geometric models, approximate symmetries and reverse engineering geometric models.
Further details on my work are available on my website Ex Tenebris Scientia and the Qyber\black international research network in quantum control.
Teaching
I am currently coordinating undergraduate individual and group projects and provide support to students on these projects. I teach a range of programming techniques, from functional programming, including analog and differentiable approaches, to quantum computing. I have also been teaching imperative and object-oriented languages and can cover anything from machine code, backend, frontend to architecture and operations. I have also been teaching graphics and artificial intelligence.
Teaching material and further details are available on my website Ex Tenebris Scientia and the Qyber\black international research network in quantum control.
Biography
Frank C. Langbein received his Mathematics degree from Stuttgart University, Germany, in 1998 and a PhD on “Beautification of Reverse Engineered Geometric Models” from Cardiff University, Wales, UK, in 2003. He is currently a senior lecturer at the School of Computer Science and Informatics, Cardiff University, where he is a member of the Visual Computing Research Section and co-leads the Qyber\black international research network in quantum control and the Healthcare Technologies Research Group. He led the research programme on vision-based geometric modelling and the interface with science at the One Wales Research Institute for Visual Computing (RIVIC). His research interests include control, machine learning and geometry applied in quantum technologies, visual computing, geometric modelling and healthcare. He is a member of the Institute of Electrical and Electronics Engineers (IEEE) and the American Mathematical Society (AMS).
Education
- 2003: PhD (Computer Science, Geometric Modelling), Cardiff University, UK.
- 1998: Diploma in Mathematics (comparable to MSc), Stuttgart University, Germany.
Career Overview
- 1999 - present: Cardiff University School of Computer Science and Informatics
- 1994 - 1999: Stuttgart University, Mathematical Institute A & B
- 1991 - 1996: Owner of a small computer business
Professional memberships
Supervisions
I am interested in supervising PhD students on topics in quantum control and magnetic resonance imaging and spectroscopy:
- Quantum control for quantum technologies:
- Robust quantum control
- Quantum reinforcement learning
- Analog quantum computing
- Learning physical laws and control models
- Magnetic resonance imaging and spectroscopy (MRI/S)
- Pulse sequence programming and quantum control
- Metabolite quantification, spectroscopy
- Early-stage cancer and dementia diagnosis
- Biochemical mechanisms and control models
Current supervision
Asmail Muftah Muftah
Research student
Muhammad Irtaza Khalid
Research student
Contact Details
LangbeinFC@cardiff.ac.uk
+44 29208 70110
Abacws, Room 3.06, Senghennydd Road, Cathays, Cardiff, CF24 4AG
+44 29208 70110
Abacws, Room 3.06, Senghennydd Road, Cathays, Cardiff, CF24 4AG
Research themes
Specialisms
- geometric modelling
- quantum control
- Machine learning
- magnetic resonance imaging and spectroscopy
- medical imaging