@inproceedings{40868, abstract = {{Recently, a generalization of the magnitude squared coherence (MSC) spectrum for more than two random processes has been proposed. The generalized MSC (GMSC) spectrum definition, which is based on the largest eigenvalue of a matrix containing all the pairwise complex coherence spectra, provides a frequency-dependent measure of the linear relationship among several stationary random processes. Moreover, it can be easily estimated by solving a generalized eigenvalue problem. In this paper we apply the GMSC spectrum for detecting the presence of a common signal from a set of linearly distorted and noisy observations. Specifically, the new statistic for the multiple-channel detection problem is the integral of the square root of the GMSC, which can be estimated as the sum of the $P$ largest generalized canonical correlations (typically $P=1$ is enough in practice). Unlike previous approaches, the new statistic implicitly takes into account the spectral characteristics of the signal to be detected (e.g., its bandwidth). Finally, the performance of the proposed detector is compared in terms of its receiver operating characteristic (ROC) curve with the generalized coherence (GC) showing a clear improvement in most scenarios.}}, author = {{Ramírez, D. and Vía, J. and Santamaría, I.}}, booktitle = {{Proc.\ IAPR Work. Cognitive Information Process.}}, title = {{{Multiple-Channel Signal Detection using the Generalized Coherence spectrum}}}, year = {{2008}}, } @inproceedings{40866, abstract = {{This paper is concerned with orthogonal frequencydivision multiplexing interleave-division multiple-access (OFDMIDMA) systems over frequency-selective fading channels. Deliberate clipping is applied to reduce the peak-to-average power ratio (PAPR) of each user’s transmitted signal. An iterative multiuser detection (MUD) technique is developed to recover the performance loss due to clipping. A semi-analytical signal-to-noise ratio (SNR) evolution technique is proposed, which can provide quick and accurate prediction of the iterative MUD performance. Numerical results show that the performance of OFDM-IDMA is not sensitive to the frequency selectivity of channels, and OFDM-IDMA is more power-efficient than other alternative multi-carrier transmission techniques}}, author = {{Tong, Jun and Guo, Qinghua and Ping, Li}}, booktitle = {{IEEE 10th\ Int.\ Symp.\ Spread Spectrum Techn.\ & Appl.}}, pages = {{555–559}}, title = {{{Performance analysis of OFDM-IDMA systems with peak-power limitation}}}, doi = {{10.1109/ISSSTA.2008.109}}, year = {{2008}}, } @inproceedings{40858, abstract = {{In this paper, we study the iterative detection problem for a coded system with multi-ary modulation. We show that, with iterative linear minimum-mean-square-error (LMMSE) detection, superposition coded modulation (SCM) can provide performance superior to that with other traditional signaling schemes used in trellis coded modulation (TCM) and bit-interleaved coded modulation (BICM). This finding provides a useful guideline for system design considering inter-symbol interference (ISI) and other forms of interference. Simulation results are provided to illustrate the efficiency of the iterative LMMSE detection with different signaling schemes.}}, author = {{Ping, Li and Tong, Jun and Yuan, Xiaojun and Guo, Qinghua}}, booktitle = {{Proc.\ IEEE Global Telecomm.\ Conf.}}, pages = {{1–5}}, title = {{{Impact of signaling schemes on iterative linear minimum-mean-square-error detection}}}, doi = {{10.1109/GLOCOM.2008.ECP.665}}, year = {{2008}}, } @article{40859, abstract = {{A complex random vector is called improper if it is correlated with its complex conjugate. We introduce a measure for the degree of impropriety, which is a function of the canonical correlations between the vector and its complex conjugate (sometimes called the circularity spectrum). This measure is invariant under linear transformation, and it relates the entropy of an improper Gaussian random vector to its corresponding proper version. For vectors with given spectrum, we present upper and lower bounds on the attainable degree of impropriety, in terms of the eigenvalues of the augmented covariance matrix.}}, author = {{Schreier, Peter J.}}, journal = {{IEEE Signal Process.\ Lett.}}, pages = {{190–193}}, title = {{{Bounds on the Degree of Impropriety of Complex Random Vectors}}}, doi = {{10.1109/LSP.2007.913134}}, volume = {{15}}, year = {{2008}}, } @inproceedings{40867, abstract = {{We study linear minimum mean square error (LMMSE) filters for estimating a nonstationary second-order continuous-time stochastic process from a noisy observation. The equation for the optimal filter is treated in the Weyl symbol domain, and the involved Weyl symbols are assumed to belong to certain modulation spaces. By discretizing this equation using a Gabor frame we transform it into a matrix equation and obtain a formula for the filter by matrix inversion. The inverse matrix has off-diagonal decay at a rate that increases the more underspread the process is.}}, author = {{Wahlberg, Patrik and Schreier, Peter J.}}, booktitle = {{Proc. 16th\ European Signal Process.\ Conf.}}, title = {{{A time-frequency formula for LMMSE filters for nonstationary underspread continuous-time stochastic processes}}}, year = {{2008}}, } @misc{35461, author = {{Alpsancar, Suzana and Denker, Kai and Kaminski, Andreas and Rölli, Marc and Sabrowski, Maxine and Hetzel, Andreas}}, pages = {{79--86}}, title = {{{Bericht zum XXI. Deutschen Kongress für Philosophie ‚Lebenswelt und Wissenschaft' - Essen, 15.-19.09.2008}}}, year = {{2008}}, } @article{40370, author = {{Haller, Melanie and Fleischle-Braun, Claudia and Stabel (Hg.), Ralf}}, journal = {{TanzForschung und TanzAusbildung. Dokumentation des Jubiläumssymposiums der Gesellschaft für Tanzforschung im Oktober 2007, Hamburg, S. 132-139}}, title = {{{Paartanz als nonverbale Kommunikation und sein (Inter-?) Subjekt. Theoretische Skizze eines Forschungsvorhabens.}}}, year = {{2008}}, } @article{40372, author = {{Haller, Melanie and Funke-Wieneke, Jürgen and Klein (Hg.), Gabriele}}, journal = {{Bewegungsraum und Stadtkultur. Sozial- und kulturwissenschaftliche Perspektiven, Bielefeld 2008, S.51-74 (zusammen mit Gabriele Klein)}}, title = {{{Café Buenos Aires und Galeria del Latino. Zur Translokalität und Hybridität städtischer Tanzkulturen}}}, year = {{2008}}, } @article{40375, author = {{Haller, Melanie and Rehberg (Hg.), Karl-Siegbert }}, journal = {{Die Natur der Gesellschaft. Verhandlungen des 33. Kongresses der Deutschen Gesellschaft für Soziologie 2006), Frankfurt a. M., S. 2734-2747 (zusammen mit Gabriele Klein)}}, title = {{{Die 'Natur der Subjekte'. Subjektivierungsprozesse im Tanz}}}, year = {{2008}}, } @article{40369, author = {{Haller, Melanie}}, journal = {{In: Ästhetik und Kommunikation, Hf. 146, 40 Jahrgang, S. 96-97}}, title = {{{Der einzelne Schritt wird zum Erlebnis“ oder warum tanzt der Mensch}}}, year = {{2008}}, } @article{14935, author = {{Sureth-Sloane, Caren and Maiterth, Ralf}}, issn = {{1863-6683}}, journal = {{Review of Managerial Science}}, number = {{2}}, pages = {{81--110}}, title = {{{The impact of minimum taxation by an imputable wealth tax on capital budgeting and business strategy of German companies}}}, doi = {{10.1007/s11846-008-0016-z}}, volume = {{2}}, year = {{2008}}, } @article{14933, author = {{Niemann, Rainer and Sureth-Sloane, Caren}}, issn = {{0344-9327}}, journal = {{Journal für Betriebswirtschaft}}, number = {{3}}, pages = {{121--140}}, title = {{{Steuern und Risikobereitschaft in Modellen irreversibler Investitionen}}}, doi = {{10.1007/s11301-008-0037-3}}, volume = {{58}}, year = {{2008}}, } @article{41276, author = {{Graziola, Francesco and Girardi, Fabrizio and Bauer, Matthias and Di Maggio, Rosa and Rovezzi, Mauro and Bertagnolli, Helmut and Sada, Cinzia and Rossetto, Gilberto and Gross, Silvia}}, issn = {{0032-3861}}, journal = {{Polymer}}, keywords = {{Polymers and Plastics, Materials Chemistry, Organic Chemistry}}, number = {{20}}, pages = {{4332--4343}}, publisher = {{Elsevier BV}}, title = {{{UV-photopolymerisation of poly(methyl methacrylate)-based inorganic–organic hybrid coatings and bulk samples reinforced with methacrylate-modified zirconium oxocluster}}}, doi = {{10.1016/j.polymer.2008.08.005}}, volume = {{49}}, year = {{2008}}, } @inproceedings{17275, abstract = {{How to teach actions to a robot as well as how a robot learns actions is an important issue to be discussed in designing robot learning systems. Inspired by human parent-infant interaction, we hypothesize that a robot equipped with infant-like abilities can take advantage of parental proper teaching. Parents are known to significantly alter their infant-directed actions versus adult-directed ones, e.g. make more pauses between movements, which is assumed to aid the infants’ understanding of the actions. As a first step, we analyzed parental actions using a primal attention model. The model based on visual saliency can detect likely important locations in a scene without employing any knowledge about the actions or the environment. Our statistical analysis revealed that the model was able to extract meaningful structures of the actions, e.g. the initial and final state of the actions and the significant state changes in them, which were highlighted by parental action modifications. We further discuss the issue of designing an infant-like robot that can induce parent-like teaching, and present a human-robot interaction experiment evaluating our robot simulation equipped with the saliency model.}}, author = {{Nagai, Yukie and Muhl, Claudia and Rohlfing, Katharina}}, booktitle = {{The 2008 IEEE International Conference on Robotics and Automation}}, keywords = {{icra08}}, pages = {{3545--3550}}, title = {{{Toward Designing a Robot that Learns Actions from Parental Demonstrations}}}, doi = {{10.1109/robot.2008.4543753}}, year = {{2008}}, } @inproceedings{17278, abstract = {{This paper investigates the influence of feedback provided by an autonomous robot (BIRON) on users’ discursive behavior. A user study is described during which users show objects to the robot. The results of the experiment indicate, that the robot’s verbal feedback utterances cause the humans to adapt their own way of speaking. The changes in users’ verbal behavior are due to their beliefs about the robots knowledge and abilities. In this paper they are identified and grouped. Moreover, the data implies variations in user behavior regarding gestures. Unlike speech, the robot was not able to give feedback with gestures. Due to the lack of feedback, users did not seem to have a consistent mental representation of the robot’s abilities to recognize gestures. As a result, changes between different gestures are interpreted to be unconscious variations accompanying speech.}}, author = {{Lohse, Manja and Rohlfing, Katharina and Wrede, Britta and Sagerer, Gerhard}}, isbn = {{1050-4729}}, keywords = {{discursive behavior, autonomous robot, BIRON, man-machine systems, robot abilities, robot knowledge, user gestures, robot verbal feedback utterance, speech processing, user verbal behavior, service robots, human-robot interaction, human computer interaction, gesture recognition}}, pages = {{3481--3486}}, title = {{{“Try something else!” — When users change their discursive behavior in human-robot interaction}}}, doi = {{10.1109/ROBOT.2008.4543743}}, year = {{2008}}, } @inproceedings{17273, abstract = {{Parents significantly alter their infant-directed actions compared to adult-directed ones, which is assumed to assist the infants’ processing of the actions. This paper discusses differences in parental action modification depending on whether the goal or the means is more crucial. When demonstrating a task to an infant, parents try to emphasize the important aspects of the task by suppressing or adding their movement. Our hypothesis is that in a goal-crucial task, the initial and final states of the task should be highlighted by parental actions, whereas in a means-crucial task the movement is underlined. Our analysis using a saliency-based attention model partially verified it: When focusing on the goal, parents tended to emphasize the initial and final states of the objects used in the task by taking a long pause before/after they started/fulfilled the task. When focusing on the means, parents shook the object to highlight it, which consequently made its state invisible. We discuss our findings regarding the uniqueness and commonality of the parental action modification. We also describe our contribution to the development of robots capable of imitating human actions.}}, author = {{Nagai, Yukie and Rohlfing, Katharina}}, booktitle = {{The IEEE 7th International Conference on Development and Learning}}, title = {{{Parental Action Modification Highlighting the Goal versus the Means}}}, doi = {{10.1109/devlrn.2008.4640796}}, year = {{2008}}, } @inbook{17277, author = {{Rohlfing, Katharina}}, booktitle = {{Handbook of Communication Competence}}, editor = {{Rickheit, G. and Strohner, H.}}, isbn = {{978-3-11-018829-5}}, pages = {{103--124}}, publisher = {{Mouton de Gruyter}}, title = {{{Cognitive Foundations}}}, year = {{2008}}, } @inproceedings{17274, author = {{Nagai, Yukie and Rohlfing, Katharina}}, booktitle = {{The 16th International Conference on Infant Studies}}, title = {{{Computational Analysis of Motionese: What can infants learn from parental actions?}}}, year = {{2008}}, } @inbook{17276, author = {{Rohlfing, Katharina}}, booktitle = {{The Bielefeld Introduction to Applied Linguistics}}, editor = {{Gramley, V.}}, title = {{{Language acquisition — a multimodal avenue}}}, year = {{2008}}, } @article{26076, author = {{Han, Xiao-Feng and Weng, Yu-Xiang and Wang, Rui and Chen, Xi-Hao and Luo, Kai Hong and Wu, Ling-An and Zhao, Jimin}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Single-photon level ultrafast all-optical switching}}}, doi = {{10.1063/1.2909540}}, year = {{2008}}, }