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2015


Automatic LQR Tuning Based on Gaussian Process Optimization: Early Experimental Results
Automatic LQR Tuning Based on Gaussian Process Optimization: Early Experimental Results

Marco, A., Hennig, P., Bohg, J., Schaal, S., Trimpe, S.

Machine Learning in Planning and Control of Robot Motion Workshop at the IEEE/RSJ International Conference on Intelligent Robots and Systems (iROS), pages: , , Machine Learning in Planning and Control of Robot Motion Workshop, October 2015 (conference)

Abstract
This paper proposes an automatic controller tuning framework based on linear optimal control combined with Bayesian optimization. With this framework, an initial set of controller gains is automatically improved according to a pre-defined performance objective evaluated from experimental data. The underlying Bayesian optimization algorithm is Entropy Search, which represents the latent objective as a Gaussian process and constructs an explicit belief over the location of the objective minimum. This is used to maximize the information gain from each experimental evaluation. Thus, this framework shall yield improved controllers with fewer evaluations compared to alternative approaches. A seven-degree-of-freedom robot arm balancing an inverted pole is used as the experimental demonstrator. Preliminary results of a low-dimensional tuning problem highlight the method’s potential for automatic controller tuning on robotic platforms.

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PDF DOI Project Page [BibTex]

2015


PDF DOI Project Page [BibTex]


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Human Machine Interface for Dexto Eka: - The humanoid robot

Kumra, S., Mohan, M., Gupta, S., Vaswani, H.

In Proceedings of the IEEE International Conference on Robotics, Automation, Control and Embedded Systems (RACE), Chennai, India, Febuary 2015 (inproceedings)

Abstract
This paper illustrates hybrid control system of the humanoid robot, Dexto:Eka: focusing on the dependent or slave mode. Efficiency of any system depends on the fluid operation of its control system. Here, we elucidate the control of 12 DoF robotic arms and an omnidirectional mecanum wheel drive using an exo-frame, and a Graphical User Interface (GUI) and a control column. This paper comprises of algorithms, control mechanisms and overall flow of execution for the regulation of robotic arms, graphical user interface and locomotion.

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DOI [BibTex]

DOI [BibTex]


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Conception and development of Dexto:Eka: The Humanoid Robot - Part IV

Kumra, S., Mohan, M., Vaswani, H., Gupta, S.

In Proceedings of the IEEE International Conference on Robotics, Automation, Control and Embedded Systems (RACE), Febuary 2015 (inproceedings)

Abstract
This paper elucidates the fourth phase of the development of `Dexto:Eka: - The Humanoid Robot'. It lays special emphasis on the conception of the locomotion drive and the development of vision based system that aids navigation and tele-operation. The first three phases terminated with the completion of two robotic arms with six degrees of freedom each, structural development and the creation of a human machine interface that included an exo-frame, a control column and a graphical user interface. This phase also involved the enhancement of the exo-frame to a vision based system using a Kinect camera. The paper also focuses on the reasons behind choosing the locomotion drive and the benefits it has.

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DOI [BibTex]

DOI [BibTex]


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Probabilistic Interpretation of Linear Solvers

Hennig, P.

SIAM Journal on Optimization, 25(1):234-260, 2015 (article)

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Web PDF link (url) DOI [BibTex]

Web PDF link (url) DOI [BibTex]


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Inference of Cause and Effect with Unsupervised Inverse Regression

Sgouritsa, E., Janzing, D., Hennig, P., Schölkopf, B.

In Proceedings of the 18th International Conference on Artificial Intelligence and Statistics, 38, pages: 847-855, JMLR Workshop and Conference Proceedings, (Editors: Lebanon, G. and Vishwanathan, S.V.N.), JMLR.org, AISTATS, 2015 (inproceedings)

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Web PDF [BibTex]

Web PDF [BibTex]


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Structures of simple liquids in contact with nanosculptured surfaces

Singh, S. L., Schimmele, L., Dietrich, S.

Physical Review E, 91(3), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Line contribution to the critical Casimir force between a homogeneous and a chemically stepped surface

Parisen Toldin, F., Tröndle, M., Dietrich, S.

Journal of Physics: Condensed Matter, 27(21), IOP Publishing, Bristol, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Self-propulsion of a catalytically active particle near a planar wall: from reflection to sliding and hovering

Uspal, W. E., Popescu, M. N., Dietrich, S., Tasinkevych, M.

Soft Matter, 11(3):434-438, Royal Society of Chemistry, Cambridge, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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A size dependent evaluation of the cytotoxicity and uptake of nanographene oxide

Mendes, R. G., Koch, B., Bachmatiuk, A., Ma, X., Sanchez, S., Damm, C., Schmidt, O. G., Gemming, T., Eckert, J., Rümmeli, M. H.

Journal of Materials Chemistry B, 3(12):2522-2529, Royal Society of Chemistry, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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A bio-catalytically driven Janus mesoporous silica cluster motor with magnetic guidance

Ma, X., Sanchez, S.

Chemical Communications, 51(25):5467-5470, Royal Society of Chemistry, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Sperm Dynamics in Tubular Confinement

Magdanz, V., Koch, B., Sanchez, S., Schmidt, O. G.

Small, 11(7):781-785, Wiley Online Library, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Chromatic patchy particles: Effects of specific interactions on liquid structure

Vasilyev, O., Klumov, B. A., Tkachenko, A. V.

Physical Review E, 92(1), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Monte Carlo study of anisotropic scaling generated by disorder

Vasilyev, O., Berche, B., Dudka, M., Holovatch, Y.

Physical Review E, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Fluctuations and diffusion in sheared athermal suspensions of deformable particles

Gross, M., Krüger, T., Varnik, F.

EPL, 108(6), IoPP, Bristol, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Enzyme-Powered Hollow Mesoporous Janus Nanomotors

Ma, Xing, Jannasch, Anita, Albrecht, Urban-Raphael, Hahn, Kersten, Miguel-Lopéz, Albert, Schäfer, Erik, Sanchez, Samuel

Nano Letters, 15(10):7043-7050, American Chemical Society, Washington, DC, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Interaction between colloidal particles on an oil\textendashwater interface in dilute and dense phases

Parolini, L., Cicuta, A. D. P., Law, A. D., Maestro, A., Buzza, M. A.

Journal of Physics: Condensed Matter, 27(19), IOP Publishing, Bristol, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Anomalous Magnetotransport in Disordered Structures: Classical Edge-State Percolation

Schirmacher, Walter, Fuchs, Benedikt, Höfling, Felix, Franosch, Thomas

Physical Review Letters, 115, American Physical Society, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Precise Localization and Control of Catalytic Janus Micromotors using Weak Magnetic Fields

Khalil, I. S., Magdanz, V., Sanchez, S., Schmidt, O. G., Misra, S.

International Journal of Advanced Robotic Systems, 12, InTech, Rijeka, Croatia, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Nano-photocatalysts in microfluidics, energy conversion and environmental applications

Parmar, J., Jang, S., Soler, L., Kim, D., Sánchez, S.

Lab on a Chip, 15(11):2352-2356, Royal Society of Chemistry, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Static dielectric properties of dense ionic fluids

Zarubin, G., Bier, M.

The Journal of Chemical Physics, 142(18), American Institute of Physics, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Chemically Powered Micro-and Nanomotors

Sánchez, S., Soler, L., Katuri, J.

Angewandte Chemie, International Edition, 54(5):1414-1444, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 2015 (article)

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[BibTex]

[BibTex]


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Convergence of large-deviation estimators

Rohwer, C. M., Angeletti, F., Touchette, H.

Physical Review E, 92(5), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Geometrically Tuned Channel Permeability

Malgaretti, P., Pagonabarraga, I., Rubi, J. M.

Macromolecular Symposia, 357(1):178-188, WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces between planar and crenellated surfaces

Troendle, M., Harnau, L., Dietrich, S.

Journal of Physics: Condensed Matter, 27(21), IOP Publishing, Bristol, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Theory of rheology in confinement

Aerov, A. A., Krüger, M.

Physical Review E, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Implications of interface conventions for morphometric thermodynamics

Reindl, A., Bier, M., Dietrich, S.

Physical Review E, 91(2), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Linked topological colloids in a nematic host

Martinez, A., Hermosillo, L., Tasinkevych, M., Smalyukh, I. I.

Proceedings of the National Academy of Sciences of the United States of America, 112(15):4546-4551, National Academy of Sciences, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Colloidal spirals in nematic liquid crystals

Senyuk, B., Pandey, M.B., Liu, Q., Tasinkevych, M., Smalyukh, I. I.

Soft Matter, 11, pages: 8758-8767, Royal Society of Chemistry, Cambridge, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


Probabilistic Line Searches for Stochastic Optimization
Probabilistic Line Searches for Stochastic Optimization

Mahsereci, M., Hennig, P.

In Advances in Neural Information Processing Systems 28, pages: 181-189, (Editors: C. Cortes, N.D. Lawrence, D.D. Lee, M. Sugiyama and R. Garnett), Curran Associates, Inc., 29th Annual Conference on Neural Information Processing Systems (NIPS), 2015 (inproceedings)

Abstract
In deterministic optimization, line searches are a standard tool ensuring stability and efficiency. Where only stochastic gradients are available, no direct equivalent has so far been formulated, because uncertain gradients do not allow for a strict sequence of decisions collapsing the search space. We construct a probabilistic line search by combining the structure of existing deterministic methods with notions from Bayesian optimization. Our method retains a Gaussian process surrogate of the univariate optimization objective, and uses a probabilistic belief over the Wolfe conditions to monitor the descent. The algorithm has very low computational cost, and no user-controlled parameters. Experiments show that it effectively removes the need to define a learning rate for stochastic gradient descent. [You can find the matlab research code under `attachments' below. The zip-file contains a minimal working example. The docstring in probLineSearch.m contains additional information. A more polished implementation in C++ will be published here at a later point. For comments and questions about the code please write to mmahsereci@tue.mpg.de.]

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Matlab research code link (url) [BibTex]

Matlab research code link (url) [BibTex]


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Rheotaxis of spherical active particles near a planar wall

Uspal, W. E., Popescu, M. N., Dietrich, S., Tasinkevych, M.

Soft Matter, 11(33):6613-6632, Royal Society of Chemistry, Cambridge, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Applications of three-dimensional (3D) printing for microswimmers and bio-hybrid robotics

Stanton, M. M., Trichet-Paredes, C., Sanchez, S.

Lab on a Chip, 15(7):1634-1637, Royal Society of Chemistry, Cambridge, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Linear and nonlinear magnetic properties of ferrofluids

Szalai, I., Nagy, S., Dietrich, S.

Physical Review E, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Microfluidic-Assisted Fabrication of Flexible and Location Traceable Organo-Motor

Seo, K. D., Kwak, B. K., Sanchez, S., Kim, D. S.

IEEE Transactions on Nanobioscience, 14(3):298-304, IEEE, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Tracer diffusion of hard-sphere binary mixtures under nano-confinement

Marconi, U., Malgaretti, P., Pagonabarraga, I.

The Journal of Chemical Physics, 143(18), American Institute of Physics, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Fluctuating multicomponent lattice Boltzmann model

Belardinelli, D., Sbragaglia, M., Biferale, L., Gross, M., Varnik, F.

Physical Review E, 91(2), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Phase diagram of fluid phases in He3\textminusHe4 mixtures

Farahmand Bafi, N., Maciolek, A., Dietrich, S.

Physical Review E, 91(2), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Three-body critical Casimir forces

Gomes de Mattos, T., Harnau, L., Dietrich, S.

Physical Review E, 91(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Thermal and structural properties of ionic fluids

Bartsch, H., Dannenmann, O., Bier, M.

Physical Review E, 91(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Fluctuational electrodynamics for nonlinear media

Soo, H.

Universität Stuttgart, Stuttgart, 2015 (mastersthesis)

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[BibTex]

[BibTex]


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Micro- and Nanomachines
IEEE Transactions on Nanobioscience, 14, pages: 74, IEEE, New York, NY, 2015 (misc)

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[BibTex]

[BibTex]


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A Random Riemannian Metric for Probabilistic Shortest-Path Tractography

Hauberg, S., Schober, M., Liptrot, M., Hennig, P., Feragen, A.

In 18th International Conference on Medical Image Computing and Computer Assisted Intervention, 9349, pages: 597-604, Lecture Notes in Computer Science, MICCAI, 2015 (inproceedings)

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PDF DOI [BibTex]

PDF DOI [BibTex]


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Frenetic aspects of second order response

Basu, U., Krüger, M., Lazarescu, A., Maes, C.

Physical Chemistry Chemical Physics, 17(9):6653-6666, Royal Society of Chemistry, Cambridge, England, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces in the presence of random surface fields

Maciolek, A., Vasilyev, O., Dotsenko, V., Dietrich, S.

Physical Review E, 91(3), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Lab-in-a-tube systems as ultra-compact devices

Sanchez, S.

Lab chip, (3):610-613, 2015 (article)

Abstract
{In this Focus article, I will give an overview on the current and future interests of our multidisciplinary research group. One of our main interests is to develop highly integrated on-chip components towards ultra-compact devices for biosensing technologies (lab-in-a-tube). Our other activities are focused in developing self-powered devices that can generate either motion of a fluid or autonomous propulsion. We are particularly interested in three-dimensional (3D) nanofabrication technologies and stimuli responsive soft materials.}

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DOI [BibTex]

DOI [BibTex]


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Catalytic Mesoporous Janus Nanomotors for Active Cargo Delivery

Ma, X., Hahn, K., Sanchez, S.

Journal of the American Chemical Society, 137(15):4976-4979, ACS Publications, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Guest Editorial: Special Issue: Micro- and Nanomachines

Paxton, W., Sanchez, S., Nitta, T.

IEEE Transactions on Nanobioscience, 14(3):258-259, IEEE, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Self-Assembly via Microfluidics

Wang, L., Sanchez, S.

Lab on a Chip, 15(23):4383-4386, Royal Society of Chemistry, Cambridge, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Nonequilibrium interfacial tension during relaxation

Bier, M.

Physical Review E, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Evaporation and growth of liquid drops

Pöhnl, Ruben

Universität Stuttgart, Stuttgart, 2015 (mastersthesis)

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[BibTex]

[BibTex]


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Operator Formalism for Topology-Conserving Crossing Dynamics in Planar Knot Diagrams

Rohwer, C. M., Müller-Nedebock, K. K.

Journal of Statistical Physics, 159(1):120-157, Kluwer Academic Publishers [etc.], New York, 2015 (article)

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DOI [BibTex]

DOI [BibTex]