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2011


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Optimal Reinforcement Learning for Gaussian Systems

Hennig, P.

In Advances in Neural Information Processing Systems 24, pages: 325-333, (Editors: J Shawe-Taylor and RS Zemel and P Bartlett and F Pereira and KQ Weinberger), Twenty-Fifth Annual Conference on Neural Information Processing Systems (NIPS), 2011 (inproceedings)

Abstract
The exploration-exploitation trade-off is among the central challenges of reinforcement learning. The optimal Bayesian solution is intractable in general. This paper studies to what extent analytic statements about optimal learning are possible if all beliefs are Gaussian processes. A first order approximation of learning of both loss and dynamics, for nonlinear, time-varying systems in continuous time and space, subject to a relatively weak restriction on the dynamics, is described by an infinite-dimensional partial differential equation. An approximate finitedimensional projection gives an impression for how this result may be helpful.

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PDF Web [BibTex]

2011


PDF Web [BibTex]


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Collective dynamics of colloids at fluid interfaces

Bleibel, J., Dominguez, A., Oettel, M., Dietrich, S.

European Physical Journal E, 34(11), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Anomalous transport of a tracer on percolating clusters

Spanner, M., Höfling, F., Schröder-Turk, G. E., Mecke, K., Franosch, T.

Journal of Physics: Condensed Matter, 23(23), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Dynamics of colloids in confined geometries

Almenar, L., Rauscher, M.

Journal of Physics: Condensed Matter, 23(18), 2011 (article)

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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The structure and melting transition of two-dimensional colloidal alloys

Law, A. D., Horozov, T. S., Buzza, D. M. A.

Soft Matter, 7(19):8923-8931, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Second harmonic light scattering from spherical polyelectrolyte brushes

Schürer, B., Hoffmann, M., Wunderlich, S., Harnau, L., Peschel, U., Ballauff, M., Peukert, W.

Journal of Physical Chemistry C, 115, pages: 18302-18309, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Solvation forces in Ising films with long-range boundary fields: density-matrix renormalization-group study

Drzewinski, A., Maciolek, A., Barasinski, A.

Molecular Physics, 109(7-10):1133-1141, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Pulling and pushing a cargo with a catalytically active carrier

Popescu, M. N., Tasinkevych, M., Dietrich, S.

Europhysics Letters, 95(2), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces for Ising films with variable boundary fields

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

Physical Review E, 84(4), 2011 (article)

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DOI [BibTex]


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Study of \pi\pi correlations at LHC and RHIC energies in pp collisions within the quark-gluon string model

Nilsson, M. S., Bravina, L. V., Zabrodin, E. E., Malinina, L. V., Bleibel, J.

Physical Review D, 84(5), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Micro-rheology on (polymer-grafted) colloids using optical tweezers

Gutsche, C., Elmahdy, M. M., Kegler, K., Semenov, I., Stangner, T., Otto, O., Ueberschär, O., Keyser, U. F., Krüger, M., Rauscher, M., Weeber, R., Harting, J., Kim, Y. W., Lobaskin, V., Netz, R., Kremer, F.

Journal of Physics: Condensed Matter, 23(18), IOP Publishing, Bristol, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Debye-Scherrer rings from block copolymer films with powder-like order

Busch, P., Rauscher, M., Moulin, J.-F., Müller-Buschbaum, P.

Journal of Applied Crystallography, 44(2):370-379, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Effective interactions and equilibrium configurations of colloidal particles on a sessile droplet

Guzowski, J., Tasinkevych, M., Dietrich, S.

Soft Matter, 7(9):4189-4197, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Capillary interactions in Pickering emulsions

Guzowski, J., Tasinkevych, M., Dietrich, S.

Physical Review E, 84(3), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces steered by patterned substrates

Gambassi, A., Dietrich, S.

Soft Matter, 7(4):1247-1253, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Interaction strength between proteins and polyelectrolyte brushes: A small angle X-ray scattering study

Henzler, K., Haupt, B., Rosenfeldt, S., Harnau, L., Narayanan, T., Ballauff, M.

Physical Chemistry Chemical Physics, 13, pages: 17599-17605, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Annealing of single lamella nanoparticles of polyethylene

Rochette, C. N., Rosenfeldt, S., Henzler, K., Polzer, F., Ballauff, M., Tong, Q., Mecking, S., Drechsler, M., Narayanan, T., Harnau, L.

Macromolecules, 44(12):4845-4851, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Trapping colloids near chemical stripes via critical Casimir forces

Tröndle, M., Zvyagolskaya, O., Gambassi, A., Vogt, D., Harnau, L., Bechinger, C., Dietrich, S.

Molecular Physics, 109, pages: 1169-1185, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Electrostatic interactions in critical solvents

Bier, M., Gambassi, A., Oettel, M., Dietrich, S.

Europhysics Letters, 95, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Structural investigation of thin diblock copolymer films using time-of-flight grazing-incidence small-angle neutron scattering

Metwalli, E., Moulin, J.-F., Rauscher, M., Kaune, G., Ruderer, M. A., Van Bürck, U., Haese-Seiller, M., Kampmann, R., Müller-Buschbaum, P.

Journal of Applied Crystallography, 44(1):84-92, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Complexation of beta-lactoglobulin fibrils and sulfated polysaccharides

Jones, O. G., Handschin, S., Adamcik, J., Harnau, L., Bolisetty, S., Mezzenga, R.

Biomacromolecules, 12, pages: 3056-3065, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Magnetization of multicomponent ferrofluids

Szalai, I., Dietrich, S.

Journal of Physics: Condensed Matter, 23(32), 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Space-resolved dynamics of a tracer in a disordered solid

Franosch, T., Spanner, M., Bauer, T., Schröder-Turk, G. E., Höfling, F.

Journal of Non-Crystalline Solids, 357(2):472-478, 2011 (article)

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DOI [BibTex]

DOI [BibTex]


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Long-wavelength anomalies in the asymptotic behavior of mode-coupling theory

Schnyder, S. K., Höfling, F., Franosch, T., Voigtmann, T.

Journal of Physics: Condensed Matter, 23(23), 2011 (article)

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DOI [BibTex]

DOI [BibTex]

2010


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Using an Infinite Von Mises-Fisher Mixture Model to Cluster Treatment Beam Directions in External Radiation Therapy

Bangert, M., Hennig, P., Oelfke, U.

In pages: 746-751 , (Editors: Draghici, S. , T.M. Khoshgoftaar, V. Palade, W. Pedrycz, M.A. Wani, X. Zhu), IEEE, Piscataway, NJ, USA, Ninth International Conference on Machine Learning and Applications (ICMLA), December 2010 (inproceedings)

Abstract
We present a method for fully automated selection of treatment beam ensembles for external radiation therapy. We reformulate the beam angle selection problem as a clustering problem of locally ideal beam orientations distributed on the unit sphere. For this purpose we construct an infinite mixture of von Mises-Fisher distributions, which is suited in general for density estimation from data on the D-dimensional sphere. Using a nonparametric Dirichlet process prior, our model infers probability distributions over both the number of clusters and their parameter values. We describe an efficient Markov chain Monte Carlo inference algorithm for posterior inference from experimental data in this model. The performance of the suggested beam angle selection framework is illustrated for one intra-cranial, pancreas, and prostate case each. The infinite von Mises-Fisher mixture model (iMFMM) creates between 18 and 32 clusters, depending on the patient anatomy. This suggests to use the iMFMM directly for beam ensemble selection in robotic radio surgery, or to generate low-dimensional input for both subsequent optimization of trajectories for arc therapy and beam ensemble selection for conventional radiation therapy.

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Web DOI [BibTex]

2010


Web DOI [BibTex]


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Coherent Inference on Optimal Play in Game Trees

Hennig, P., Stern, D., Graepel, T.

In JMLR Workshop and Conference Proceedings Volume 9: AISTATS 2010, pages: 326-333, (Editors: Teh, Y.W. , M. Titterington ), JMLR, Cambridge, MA, USA, Thirteenth International Conference on Artificial Intelligence and Statistics, May 2010 (inproceedings)

Abstract
Round-based games are an instance of discrete planning problems. Some of the best contemporary game tree search algorithms use random roll-outs as data. Relying on a good policy, they learn on-policy values by propagating information upwards in the tree, but not between sibling nodes. Here, we present a generative model and a corresponding approximate message passing scheme for inference on the optimal, off-policy value of nodes in smooth AND/OR trees, given random roll-outs. The crucial insight is that the distribution of values in game trees is not completely arbitrary. We define a generative model of the on-policy values using a latent score for each state, representing the value under the random roll-out policy. Inference on the values under the optimal policy separates into an inductive, pre-data step and a deductive, post-data part. Both can be solved approximately with Expectation Propagation, allowing off-policy value inference for any node in the (exponentially big) tree in linear time.

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PDF Web [BibTex]

PDF Web [BibTex]


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Comment on biomimetic ultrathin whitening by capillary-force-induced random clustering of hydrogel micropillar arrays

Bernardino, N. R., Dietrich, S.

ACS Applied Materials \& Interfaces, 2(3):603-604, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Wetting of surfaces covered by elastic hairs

Bernardino, N. R., Blickle, V., Dietrich, S.

Langmuir, 26(10):7233-7241, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Phase diagrams of binary mixtures of oppositely charged colloids

Bier, M., van Roij, R., Dijkstra, M.

Journal of Chemical Physics, 133(12), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Narrow-escape times for diffusion in microdomains with a particle-surface affinity: mean-field results

Oshanin, G., Tamm, M., Vasilyev, O.

Journal of Chemical Physics, 132(23), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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The localization transition of the two-dimensional Lorentz model

Bauer, T., Höfling, Felix, Munk, T., Frey, E., Franosch, T.

European Physical Journal - Special Topics, 189(1):103-118, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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DDFT for Brownian particles and hydrodynamics

Rauscher, M.

Journal of Physics: Condensed Matter, 22(36), 2010 (article)

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Colloidal particles in liquid crystal films and at interfaces

Tasinkevych, M., Andrienko, D.

Condensed Matter Physics, 13(3), 2010 (article)

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[BibTex]

[BibTex]


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Nanofluidics of thin liquid films

Rauscher, M., Dietrich, S.

In Handbook of Nanophysics, Principles and Methods, 1, pages: 11-1-11-23, Handbook of Nanophysics, CRC Press, Boca Raton, 2010 (incollection)

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[BibTex]

[BibTex]


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Phase behavior of ionic liquid crystals

Kondrat, S., Bier, M., Harnau, L.

The Journal of Chemical Physics, 132, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Nanoindentation studies on crosslinking and curing effects of PDMS

Deuschle, J. K., de Souza, E. J., Arzt, E., Enders, S.

International Journal of Materials Research, 101(8):1014-1023, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Fundamental measure theory for hard-sphere mixtures: a review

Roth, R.

Journal of Physics: Condensed Matter, 22(6), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Universality of the glassy transitions in the two-dimensional \pmJ Ising model

Parisen Toldin, F., Pelissetto, A, Vicari, E.

Physical Review E, 82(2), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Phoretic motion of spheroidal particles due to self-generated solute gradients

Popescu, M. N., Dietrich, S., Tasinkevych, M., Ralston, J.

European Physical Journal E, 31(04):351-367, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces involving a chemically structured substrate

Parisen Toldin, F., Dietrich, S.

In International Journal of Modern Physics, 25, pages: 355-359, University of Oklahoma, USA, 2010 (inproceedings)

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DOI [BibTex]

DOI [BibTex]


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Vapor pressure of ionic liquids

Bier, M., Dietrich, S.

Molecular Physics, 108(2):211-214, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Colloidal aggregation and critical Casimir forces

Gambassi, A., Dietrich, S.

Physical Review Letters, 105(5), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Localization phenomena in models of ion-conduction glass formers

Horbach, J., Voigtmann, T., Höfling, F., Franosch, T.

European Physical Journal - Special Topics, 189(1):141-145, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Tensorial density functional theory for non-spherical hard-body fluids

Hansen-Goos, H., Mecke, K.

Journal of Physics: Condensed Matter, 22(36), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Thermoresponsive colloidal molecules

Hoffmann, M., Siebenbürger, M., Harnau, L., Hund, M., Hanske, C., Wagner, C. S., Drechsler, M., Ballauff, M.

Soft Matter, 6, pages: 1125-1128, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces and adsorption profiles in the presence of a chemically structured substrate

Parisen Toldin, F., Dietrich, S.

Journal of Statistical Mechanics: Theory and Experiment, (Nov.), 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Free energy of colloidal particles at the surface of sessile drops

Guzowski, J., Tasinkevych, M., Dietrich, S.

European Physical Journal, 33(3):219-242, 2010 (article)

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DOI [BibTex]

DOI [BibTex]


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Casimir interactions in Ising strips with boundary fields: exact results

Abraham, D. B., Maciolek, A.

Physical Review Letters, 105(5), 2010 (article)

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DOI [BibTex]

DOI [BibTex]