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2005


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Moment Inequalities for Functions of Independent Random Variables

Boucheron, S., Bousquet, O., Lugosi, G., Massart, P.

To appear in Annals of Probability, 33, pages: 514-560, 2005 (article)

Abstract
A general method for obtaining moment inequalities for functions of independent random variables is presented. It is a generalization of the entropy method which has been used to derive concentration inequalities for such functions cite{BoLuMa01}, and is based on a generalized tensorization inequality due to Lata{l}a and Oleszkiewicz cite{LaOl00}. The new inequalities prove to be a versatile tool in a wide range of applications. We illustrate the power of the method by showing how it can be used to effortlessly re-derive classical inequalities including Rosenthal and Kahane-Khinchine-type inequalities for sums of independent random variables, moment inequalities for suprema of empirical processes, and moment inequalities for Rademacher chaos and $U$-statistics. Some of these corollaries are apparently new. In particular, we generalize Talagrands exponential inequality for Rademacher chaos of order two to any order. We also discuss applications for other complex functions of independent random variables, such as suprema of boolean polynomials which include, as special cases, subgraph counting problems in random graphs.

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PDF [BibTex]

2005


PDF [BibTex]


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A tutorial on v-support vector machines

Chen, P., Lin, C., Schölkopf, B.

Applied Stochastic Models in Business and Industry, 21(2):111-136, 2005 (article)

Abstract
We briefly describe the main ideas of statistical learning theory, support vector machines (SVMs), and kernel feature spaces. We place particular emphasis on a description of the so-called -SVM, including details of the algorithm and its implementation, theoretical results, and practical applications. Copyright © 2005 John Wiley & Sons, Ltd.

ei

PDF [BibTex]

PDF [BibTex]


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Robust EEG Channel Selection Across Subjects for Brain Computer Interfaces

Schröder, M., Lal, T., Hinterberger, T., Bogdan, M., Hill, J., Birbaumer, N., Rosenstiel, W., Schölkopf, B.

EURASIP Journal on Applied Signal Processing, 2005(19, Special Issue: Trends in Brain Computer Interfaces):3103-3112, (Editors: Vesin, J. M., T. Ebrahimi), 2005 (article)

Abstract
Most EEG-based Brain Computer Interface (BCI) paradigms come along with specific electrode positions, e.g.~for a visual based BCI electrode positions close to the primary visual cortex are used. For new BCI paradigms it is usually not known where task relevant activity can be measured from the scalp. For individual subjects Lal et.~al showed that recording positions can be found without the use of prior knowledge about the paradigm used. However it remains unclear to what extend their method of Recursive Channel Elimination (RCE) can be generalized across subjects. In this paper we transfer channel rankings from a group of subjects to a new subject. For motor imagery tasks the results are promising, although cross-subject channel selection does not quite achieve the performance of channel selection on data of single subjects. Although the RCE method was not provided with prior knowledge about the mental task, channels that are well known to be important (from a physiological point of view) were consistently selected whereas task-irrelevant channels were reliably disregarded.

ei

Web DOI [BibTex]

Web DOI [BibTex]


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Nonlinear optical spectroscopy of chiral molecules

Fischer, P., Hache, F.

CHIRALITY, 17(8):421-437, 2005 (article)

Abstract
We review nonlinear optical processes that are specific to chiral molecules in solution and on surfaces. In contrast to conventional natural optical activity phenomena, which depend linearly on the electric field strength of the optical field, we discuss how optical processes that are nonlinear (quadratic, cubic, and quartic) functions of the electromagnetic field strength may probe optically active centers and chiral vibrations. We show that nonlinear techniques open entirely new ways of exploring chirality in chemical and biological systems: The cubic processes give rise to nonlinear circular dichroism and nonlinear optical rotation and make it possible to observe dynamic chiral processes at ultrafast time scales. The quadratic second-harmonic and sum-frequency-generation phenomena and the quartic processes may arise entirely in the electric-dipole approximation and do not require the use of circularly polarized light to detect chirality: They provide surface selectivity and their observables can be relatively much larger than in linear optical activity. These processes also give rise to the generation of light at a new color, and in liquids this frequency conversion only occurs if the solution is optically active. We survey recent chiral nonlinear optical experiments and give examples of their application to problems of biophysical interest. (C) 2005 Wiley-Liss, Inc.

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DOI [BibTex]

DOI [BibTex]


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Negative refraction at optical frequencies in nonmagnetic two-component molecular media

Chen, Y., Fischer, P., Wise, F.

PHYSICAL REVIEW LETTERS, 95(6), 2005 (article)

Abstract
There is significant motivation to develop media with negative refractive indices at optical frequencies, but efforts in this direction are hampered by the weakness of the magnetic response at such frequencies. We show theoretically that a nonmagnetic medium with two atomic or molecular constituents can exhibit a negative refractive index. A negative index is possible even when the real parts of both the permittivity and permeability are positive. This surprising result provides a route to isotropic negative-index media at optical frequencies.

pf

DOI [BibTex]

DOI [BibTex]


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A model of smooth pursuit based on learning of the target dynamics using only retinal signals

Shibata, T., Tabata, H., Schaal, S., Kawato, M.

Neural Networks, 18, pages: 213-225, 2005, clmc (article)

Abstract
While the predictive nature of the primate smooth pursuit system has been evident through several behavioural and neurophysiological experiments, few models have attempted to explain these results comprehensively. The model we propose in this paper in line with previous models employing optimal control theory; however, we hypothesize two new issues: (1) the medical superior temporal (MST) area in the cerebral cortex implements a recurrent neural network (RNN) in order to predict the current or future target velocity, and (2) a forward model of the target motion is acquired by on-line learning. We use stimulation studies to demonstrate how our new model supports these hypotheses.

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link (url) [BibTex]

link (url) [BibTex]


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From colloidal Co/CoO core/shell nanoparticles to arrays of metallic nanomagnets: surface modification and magnetic properties

Wiedwald, U., Fauth, K., Hessler, M., Boyen, H. G., Weigl, F., Hilgendorff, M., Giersig, M., Schütz, G., Ziemann, P., Farle, M.

{ChemPhysChem}, 6(12):2522-2526, 2005 (article)

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[BibTex]

[BibTex]


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Competition between order and phase separation in Au-Ni

Reichert, H., Schöps, A., Ramsteiner, I. B., Bugaev, V. N., Shchyglo, O., Udyansky, A., Dosch, H., Asta, M., Drautz, R., Honkimäki, V.

{Physical Review Letters}, 95(23), 2005 (article)

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[BibTex]

[BibTex]


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Influence of faceting-roughening on triple-junction migration in zinc

Straumal, B. B., Sursaeva, V. G., Gomakova, A. S.

{Zeitschrift f\"ur Metallkunde}, 96(10):1147-1151, 2005 (article)

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[BibTex]

[BibTex]


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Damping of spin dynamics in nanostructures: an ab initio study

Steiauf, D., Fähnle, M.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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Test of the hypothesis of transient molten state diffusion for swift-heavy-ion induced mixing

Srivastava, S. K.., Avasthi, D. K., Assmann, W., Wang, Z. G., Kucal, H., Jaquet, E., Carstanjen, H. D., Toulemonde, M.

{Physical Review B}, 71, 2005 (article)

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[BibTex]

[BibTex]


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Hydrogen physisorption in metal-organic porous crystals

Panella, B., Hirscher, M.

{Advanced Materials}, 17(5):538-541, 2005 (article)

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[BibTex]

[BibTex]


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The influence of misorientation deviation on the faceting of \Sigma3 grain boundaries in aluminium

Kogtenkova, O., Straumal, B., Protasova, S., Tsurekawa, S., Watanabe, T.

{Zeitschrift f\"ur Metallkunde}, 96(2):216-219, 2005 (article)

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[BibTex]

[BibTex]


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Metal-oxide interfacial reactions: encapsulation of Pd on TiO2(110)

Fu, Q., Wagner, Th., Olliges, S., Carstanjen, H. D.

{Journal of Physical Chemistry B}, 109, pages: 944-951, 2005 (article)

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[BibTex]

[BibTex]


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Faceting of \Sigma3 and \Sigma9 grain boundaries in Cu-Bi alloys

Straumal, B. B., Polyakov, S. A., Bischoff, E., Gust, W., Baretzky, B.

{Acta Materialia}, 53(2):247-254, 2005 (article)

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[BibTex]

[BibTex]


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Dependence of damage efficiency of ions in diamond on electronic stopping

Friedland, E., Carstanjen, H. D., Myberg, G., Nasr, M. A.

{Nuclear Instruments and Methods in Physics Research B}, 230, pages: 129-132, 2005 (article)

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[BibTex]

[BibTex]


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Volumetric measurement of hydrogen storage in HCl-treated polyaniline and polypyrrole

Panella, B., Kossykh, L., Dettlaff-Weglikowska, U., Hirscher, M., Zerbi, G., Roth, S.

{Synthetic Metals}, 151, pages: 208-210, 2005 (article)

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[BibTex]

[BibTex]


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Permanent magnet alloys based on Sm2Co17; phase evolution in the quinary system Sm-Zr-FeCo-Cu

Stadelmaier, H. H., Goll, D., Kronmüller, H.

{Zeitschrift f\"ur Metallkunde}, 96(1):17-23, 2005 (article)

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[BibTex]

[BibTex]


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Parametric and Non-Parametric approaches for nonlinear tracking of moving objects

Hidaka, Y, Theodorou, E.

Technical Report-2005-1, 2005, clmc (article)

am

PDF [BibTex]

PDF [BibTex]


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Anisotropic temperature-dependent current densities in vicinal YBCO

Djupmyr, M., Cristiani, G., Habermeier, H.-U., Albrecht, J.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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Effects of catalysts on the dehydriding of alanates monitored by proton NMR

Majer, G., Stanik, E., Valiente-Banuet, L. E., Grinberg, F., Kircher, O., Fichtner, M.

{Journal of Alloys and Compounds}, 404, pages: 738-742, 2005 (article)

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[BibTex]

[BibTex]


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Kinetics of carbon precipitation and re-solution in low Si-content silicon iron

Walz, F., Wakisaka, T., Kronmüller, H.

{Physica Status Solidi A}, 202(14):2667-2678, 2005 (article)

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[BibTex]

[BibTex]


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Highly homogeneous MgB2 films prepared by a new post-annealing process

Matveev, A., Albrecht, J., Konuma, M., Stuhlhofer, B., Starke, U., Habermeier, H.-U.

{Superconductor Science and Technology}, 18, pages: 1313-1316, 2005 (article)

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[BibTex]

[BibTex]


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Spin-polarized quasiparticle injection effects in YBCO thin films

Soltan, S., Albrecht, J., Habermeier, H.-U.

{Solid State Communications}, 135, pages: 461-465, 2005 (article)

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[BibTex]

[BibTex]


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Thermodynamic properties from ab-initio calculations: New theoretical developments, and applications to various materials systems

Fähnle, M., Drautz, R., Lechermann, F., Singer, R., Diaz-Ortiz, A., Dosch, H.

{Physica Status Solidi (B)}, 242, pages: 1159-1173, 2005 (article)

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[BibTex]

[BibTex]


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Nuclear magnetic resonance measurements of the hydrogen dynamics in nanocrystalline graphite

Stanik, E., Majer, G., Orimo, S., Ichikawa, T., Fujii, H.

{Journal of Applied Physics}, 98, 2005 (article)

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[BibTex]

[BibTex]


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Oxygen K-edge shift at the Verwey transition of magnetite

Goering, E., Gold, S., Lafkioti, M., Schütz, G., Brabers, V. A. M.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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First-principles investigation of the Ni-Fe-Al system

Lechermann, F., Fähnle, M., Sanchez, J. M.

{Intermetallics}, 13((10)):1096-1109, 2005 (article)

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[BibTex]

[BibTex]


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GdN thin films: Bulk and local electronic and magnetic properties

Leuenberger, F., Parge, A., Felsch, W., Fauth, K., He\ssler, M.

{Physical Review B}, 72(1), 2005 (article)

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[BibTex]

[BibTex]


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Hydrogen permeation through Pd/Fe and Pd/Ni multilayer systems

Yamakawa, K., Ege, M., Hirscher, M., Ludescher, B., Kronmüller, H.

{Journal of Alloys and Compounds}, 393(1-2):5-10, 2005 (article)

mms

[BibTex]

[BibTex]


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Parametrization of the magnetic energy at the atomic level

Drautz, R., Fähnle, M.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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Time-scales of electronic processes in Fe3O4 - An attempt to resolve a recently accentuated controversy

Fähnle, M., Kronmüller, H., Walz, F.

{Physica B}, 369, pages: 177-180, 2005 (article)

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[BibTex]

[BibTex]


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Interlayer contraction in MgB2 upon replacement of Mg by Al: Effect of the covalent bond energy

Bester, G., Fähnle, M.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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First-principles atomistic modeling of ordering phenomena and phase diagrams

Fähnle, M., Drautz, R., Lechermann, F., Singer, R., Diaz-Ortiz, A., Dosch, H.

{TMS Letters}, 2(1):7-8, 2005 (article)

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[BibTex]

[BibTex]


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Constrained spin-density functional theory for excited magnetic configurations in an adiabatic approximation

Singer, R., Fähnle, M., Bihlmayer, G.

{Physical Review B}, 71, 2005 (article)

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[BibTex]

[BibTex]


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The influence of magnetism on atomic defects and diffusion: model calculations and ab initio electron theory

Fähnle, M., Schimmele, L.

{Defect and Diffusion Forum}, 237-240, pages: 19-29, 2005 (article)

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[BibTex]

[BibTex]


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X-ray magnetic circular dichroism sum rule correction for the light transition metals

Goering, E.

{Philosophical Magazine}, 85, pages: 2895-2911, 2005 (article)

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[BibTex]

[BibTex]


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Temperature dependence of the magnetocrystalline anisotropy energy and projected microscopic magnetic moments in epitaxial CrO2 films

Gold, S., Goering, E., König, C., Rüdiger, U., Güntherodt, G., Schütz, G.

{Physical Review B}, 71(22), 2005 (article)

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On the imaging of the flux-line lattice of a type-II superconductor by soft X-ray absorption spectroscopy

Fähnle, M., Albrecht, J., Eimüller, T., Fisher, P., Goering, E., Steiauf, D., Schütz, G.

{Journal of Synchrotron Radiation}, 12, pages: 251-253, 2005 (article)

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[BibTex]

[BibTex]


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Grain-boundary melting phase transition in the Cu-Bi system

Divinski, S., Lohmann, M., Herzig, C., Straumal, B., Baretzky, B., Gust, W.

{Physical Review B}, 71, 2005 (article)

mms

[BibTex]

[BibTex]


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A fast ab initio approach to the simulation of spin dynamics

Fähnle, M., Drautz, R., Singer, R., Steiauf, D., Berkov, D. V.

{Computational Materials Science}, 32, pages: 118-122, 2005 (article)

mms

[BibTex]

[BibTex]


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Hydrogen adsorption in different carbon nanostructures

Panella, B., Hirscher, M., Roth, S.

{Carbon}, 43, pages: 2209-2214, 2005 (article)

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[BibTex]

[BibTex]


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Synthesis of the nanocrystalline MgS and its interaction with hydrogen

Goo, N. H., Hirscher, M.

{Journal of Alloys and Compounds}, 404, pages: 503-506, 2005 (article)

mms

[BibTex]

[BibTex]


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Time-scales of electronic processes in Fe3O4 - An attempt to resolve a recently accentuated controversy

Fähnle, M., Kronmüller, H., Walz, F.

{Physica B}, 369, pages: 177-180, 2005 (article)

mms

[BibTex]

[BibTex]


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Bending of magnetic avalanches in MgB2 thin films

Albrecht, J., Matveev, A., Djupmyr, M., Schütz, G., Stuhlhofer, B., Habermeier, H.

{Applied Physics Letters}, 87, 2005 (article)

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[BibTex]

[BibTex]


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Magnetic pinning of flux lines in heterostructures of cuprates and manganites

Albrecht, J., Soltan, S., Habermeier, H.-U.

{Physical Review B}, 72, 2005 (article)

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[BibTex]

[BibTex]


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On the pair-potential modelling of alloy surfaces

Drautz, R., Fähnle, M.

{Surface Science}, 585, pages: 108-112, 2005 (article)

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[BibTex]

[BibTex]


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Crystal field parameters at the (0001) surface of rare-earth metals: an ab initio study

Welsch, F., Fähnle, M., Jensen, P. J.

{Journal of Physics: Condensed Matter}, 17, pages: 2061-2072, 2005 (article)

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[BibTex]

[BibTex]


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Spatially resolved ferromagnetic resonance: Imaging of ferromagnetic eigenmodes

Puzic, A., Van Waeyenberge, B., Chou, K. W., Fischer, P., Stoll, H., Schütz, G., Tyliszczak, T., Rott, K., Brückl, H., Reiss, G., Neudecker, I., Haug, T., Buess, M., Back, C. H.

{Journal of Applied Physics}, 97, 2005 (article)

mms

DOI [BibTex]

DOI [BibTex]


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Proton magnetic resonance spectra of YH3 and LuH3

Brady, S. K., Conradi, M. S., Majer, G., Barnes, R. G.

{Physical Review B}, 72, 2005 (article)

mms

[BibTex]

[BibTex]