@inproceedings{38194, author = {{Hoya, Fabian Karl and Hellmich, Frank}}, publisher = {{Technische Universität Braunschweig}}, title = {{{Individuelles Feedback in heterogen zusammengesetzten Lerngruppen im Leseunterricht der Grundschule – Befunde aus einer empirischen Studie. Vortrag auf der Tagung „Gemeinsam anders lehren und lernen – Wege in die inklusive Bildung“. Gemeinsame Jahrestagung der DGfE Kommission Grundschulforschung und Didaktik der Primarstufe und der DGfE Sektion Sonderpädagogik}}}, year = {{2013}}, } @inproceedings{38192, author = {{Förster, Sabrina and Hellmich, Frank}}, publisher = {{Humboldt Universität zu Berlin}}, title = {{{Möglichkeiten der Lesestrategieförderung bei leistungsschwächeren Kindern im Leseunterricht der Grundschule. Vortrag auf der Tagung der Deutschen Gesellschaft für Lesen und Schreiben (DGLS)}}}, year = {{2013}}, } @article{40352, author = {{Wallmeier, Nadine and Menke, Kirsten}}, journal = {{Korrespondenzblatt des Vereins für niederdeutsche Sprachforschung}}, number = {{2}}, pages = {{41--52}}, title = {{{Tagungsbericht: 126. Jahresversammlung des Vereins für niederdeutsche Sprachforschung in Flensburg.}}}, volume = {{120}}, year = {{2013}}, } @article{40070, author = {{Graczyk, Piotr and Jakubowski, Tomasz and Luks, Tomasz}}, issn = {{1385-1292}}, journal = {{Positivity}}, number = {{4}}, pages = {{1043--1070}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Martin representation and Relative Fatou Theorem for fractional Laplacian with a gradient perturbation}}}, doi = {{10.1007/s11117-012-0220-6}}, volume = {{17}}, year = {{2013}}, } @inbook{36549, abstract = {{Wie ist der derzeitige Wissensstand in der Gemeinwesenarbeit? Das Handbuch systematisiert und aktualisiert das Theorie- und Praxiswissen für dieses Gebiet. Vorgestellt werden Traditionen und Diskussionen insbesondere in Deutschland, Österreich und der Schweiz. In der Praxis stellt sich Gemeinwesenarbeit einerseits als Arbeitsprinzip und als Fachkonzept dar, das an Aktualität gewonnen hat, andererseits aber zwischen Sozialraumorientierung und aktivierendem Sozialstaat zu verschwimmen droht. Die AutorInnen arbeiten daher das Konzept Gemeinwesenarbeit historisch auf und überprüfen es daraufhin, welche Beiträge es für eine fachtheoretische Weiterentwicklung der Sozialen Arbeit aktuell einbringen kann. Es werden die verschiedenen Handlungsfelder der Gemeinwesenarbeit betrachtet, nicht mit dem Ziel einer „Leistungsschau“, sondern vielmehr als kritische Würdigung.}}, author = {{Landhäußer, Sandra}}, booktitle = {{Handbuch Gemeinwesenarbeit}}, editor = {{Stövesand, Sabine and Stoik, Christoph and Troxler, Ueli}}, isbn = {{ISBN: 978-3-86649-411-4 }}, keywords = {{Gemeinwesenarbeit, Sozialraum, Zivilgesellschaft}}, pages = {{154--160}}, publisher = {{Barbara Budrich}}, title = {{{Gemeinwesenarbeit und die Aktivierung von sozialem Kapital}}}, year = {{2013}}, } @inbook{40634, abstract = {{Das Forschende Lernen gehörte von Beginn an zu den expliziten Grundprinzipien von Lernwerkstattsarbeit. So formulierte Karin Ernst bereits 1993: „… dass Erwachsene selbst anders lernen müssen – aktiv, forschend, entdeckend, kreativ, offen –, um mit Kindern auf andere Weise Schule machen zu können“ (Ernst 1993, 18).}}, author = {{Kottmann, Brigitte}}, booktitle = {{Studieren in Lernwerkstätten – Potentiale und Herausforderungen für die Lehrerbildung}}, editor = {{Coelen, Hendrik and Müller-Naendrup, Barbera}}, isbn = {{9783658003142}}, pages = {{183--191}}, publisher = {{Springer VS}}, title = {{{Forschendes Lernen in Lernwerkstätten}}}, doi = {{10.1007/978-3-658-00315-9_1}}, year = {{2013}}, } @article{40796, abstract = {{In this paper we study the existence of locally most powerful invariant tests (LMPIT) for the problem of testing the covariance structure of a set of Gaussian random vectors. The LMPIT is the optimal test for the case of close hypotheses, among those satisfying the invariances of the problem, and in practical scenarios can provide better performance than the typically used generalized likelihood ratio test (GLRT). The derivation of the LMPIT usually requires one to find the maximal invariant statistic for the detection problem and then derive its distribution under both hypotheses, which in general is a rather involved procedure. As an alternative, Wijsman’s theorem provides the ratio of the maximal invariant densities without even finding an explicit expression for the maximal invariant. We first consider the problem of testing whether a set of N-dimensional Gaussian random vectors are uncorrelated or not, and show that the LMPIT is given by the Frobenius norm of the sample coherence matrix. Second, we study the case in which the vectors under the null hypothesis are uncorrelated and identically distributed, that is, the sphericity test for Gaussian vectors, for which we show that the LMPIT is given by the Frobenius norm of a normalized version of the sample covariance matrix. Finally, some numerical examples illustrate the performance of the proposed tests, which provide better results than their GLRT counterparts.}}, author = {{Ramírez, D. and Vía, J. and Santamaría, I. and Scharf, L. L.}}, journal = {{IEEE Trans.\ Inform.\ Theory}}, number = {{4}}, pages = {{2128–2141}}, title = {{{Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors}}}, doi = {{10.1109/TIT.2012.2232705}}, volume = {{59}}, year = {{2013}}, } @article{40800, abstract = {{In this paper, we study the multiple-input multiple-output two-way relay channel (MIMO-TWRC) when the nodes and relay use analog beamforming. Following the amplify-andforward (AF) strategy, the problem consists of finding the transmit and receive beamformers of the nodes and relay (as well as the power allocated to each one) that achieve the boundary of the optimal rate region. To solve it, we first express the optimal node beamformers in terms of relay beamformers and then show that the optimal rate region can efficiently be characterized using convex optimization techniques. We also extend our study to the multiple-relay scenario when the source nodes are single antenna and propose a distributed algorithm to compute the relay beamforming matrices. The proposed algorithm consists of solving two different subproblems. First, each individual TWRC is optimized independently. Next, a distributed beamforming is applied to make the signals from the relays add up coherently at the source nodes. Numerical examples are provided to illustrate the performance of the proposed techniques and to compare the performance of analog beamforming architectures against conventional MIMO schemes that operate at the baseband.}}, author = {{Lameiro, Christian and Vía, Javier and Santamaría, Ignacio}}, journal = {{IEEE Trans. Veh. Techn.}}, pages = {{642–654}}, title = {{{Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming}}}, doi = {{10.1109/TVT.2012.2226612}}, volume = {{62}}, year = {{2013}}, } @inproceedings{40793, abstract = {{In this paper we provide an efficient procedure to compute the total number of degrees of freedom (DoF), achievable by linear beamforming, of the $K$-user multiple-input multiple-output (MIMO) interference channel with an arbitrary number of Tx-Rx antennas at each link. Firstly, we derive an analytical outer bound that generalizes the results that exist for the symmetric $K$-user $M\timesN$ interference channel. Secondly, we obtain a tighter bound by solving a convex optimization problem that includes as constraints the DoF characterizations for point-to-point MIMO links and for 2-user interference channels. The solution to this convex problem admits an interesting waterfilling interpretation. Finally, exploiting this outer bound and using a recently proposed feasibility test, we show that it is possible to obtain the DoF for any interference channel in an efficient way. Some simulations results are included to illustrate the tightness of the derived bounds, as well as to study the DoF achievable for the 4-user channel when we distribute the total number of antennas among users and between transmitters and receivers in different ways.}}, author = {{Lameiro, Christian and Vía, Javier and Beltrán, Carlos and Santamaría, Ignacio}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}}, title = {{{Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels}}}, doi = {{10.1109/ICASSP.2013.6638491}}, year = {{2013}}, } @article{40794, abstract = {{This paper gives a solution to the problem of verifying stability of networks consisting of integral input-to-state stable (iISS) subsystems. The iISS small-gain theorem developed recently has been restricted to interconnections of two subsystems. For large-scale systems, stability criteria relying only on gain-type information that were previously developed address only input-to-state stable (ISS) subsystems. To address the stability problem involving iISS subsystems interconnected in general structure, this paper shows how to construct Lyapunov functions of the network by means of a sum of nonlinearly rescaled individual Lyapunov functions of subsystems under an appropriate small-gain condition.}}, author = {{Ito, Hiroshi and Jiang, Zhong-Ping and Dashkovskiy, Sergey and Rüffer, Björn S.}}, journal = {{{IEEE} Trans. Autom. Control}}, number = {{5}}, pages = {{1192–1207}}, title = {{{Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions}}}, doi = {{10.1109/TAC.2012.2231552}}, volume = {{58}}, year = {{2013}}, } @inproceedings{40791, abstract = {{This work presents a variation of canonical correlation analysis (CCA), where the correlation coefficient between the instantaneous power of the projections is maximized, rather than between the projections themselves. The resulting optimization problem is not convex, and we have to resort to a sub-optimal approach. Concretely, we propose a two-step solution consisting of the singular value decomposition (SVD) of a "coherence" matrix followed by a rank-one matrix approximation. This technique is applied to blindly recovering signals in a model that is motivated by the study of neuronal dynamics in humans using electroencephalography (EEG) and magnetoencephalography (MEG). A distinctive feature of this model is that it allows recovery of amplitude-amplitude coupling between neuronal processes.}}, author = {{Ramírez, D. and Schreier, P. J. and Vía, J. and Nikulin, V. V.}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}}, title = {{{Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections}}}, doi = {{10.1109/ICASSP.2013.6638864}}, year = {{2013}}, } @inproceedings{40797, author = {{Stein, Manuel and Mezghani, Amine and Nossek, Josef A.}}, booktitle = {{Proc.\ ITG Int.\ Work. Smart Ant.}}, title = {{{Quantization-loss analysis for array signal-source localization}}}, year = {{2013}}, } @inproceedings{40801, author = {{Wendler, Friederike and Stein, Manuel and Mezghani, Amine and Nossek, Josef A.}}, booktitle = {{ION Int.\ Tech. Meet.}}, title = {{{Quantization-loss reduction for 1-bit BOC positioning}}}, year = {{2013}}, } @article{40785, abstract = {{Two concerns often arise simultaneously when applying linear estimation in communication systems: the computational complexity can be prohibitively high when the system size is large, and the performance may degrade dramatically when the presumed model is mismatched with the actual system. In this paper, we introduce a subspace expansion framework to jointly address these concerns, in which the observation is first projected onto a lower-dimensional subspace and then the solution of the projected problem is regularized. We discuss two projection methods based on eigensubspace and Krylov subspace expansions. We show that the Krylov subspace projection provides an economical solution to regularized linear estimation. We also compare different regularization methods, such as principal components and diagonal loading. We show that diagonal loading generally outperforms other alternatives and that Krylov subspace rank reduction can yield a regularization effect close to diagonal loading. Finally, we investigate the impact of preconditioning on the performance and complexity for mismatched modeling and propose a loaded preconditioner, which can reduce complexity as well as preserve the regularization effect. Under the proposed framework, various regularization schemes are studied and some guidelines for choosing the right scheme are provided.}}, author = {{Tong, Jun and Schreier, Peter J.}}, journal = {{Signal Process.}}, number = {{9}}, pages = {{2671–2686}}, title = {{{A unified framework for regularized linear estimation in communication systems}}}, doi = {{10.1016/j.sigpro.2013.03.002}}, volume = {{93}}, year = {{2013}}, } @inproceedings{40781, abstract = {{This article is concerned with global asymptotic stability (GAS) of dynamical networks. The case when subsystems are integral input-to-state stable (iISS) has been recognized as notoriously difficult to deal with in the literature. In fact, the lack of energy dissipation for large input denies direct application of the small-gain argument for input-to-state stable (ISS) subsystems. Here for networks consisting of iISS subsystems it is demonstrated that a two-phase approach allows us to make use of the ISS small-gain argument by separating a trajectory into a transient and a subsequent convergence. In contrast to the previous iISS results, the two-phase approach immediately leads to a sufficient criterion for GAS of general nonlinear networks in a matrix-like form (order condition).}}, author = {{Ito, Hiroshi and Rüffer, Björn S.}}, booktitle = {{Proc. IEEE American Contr. Conf.}}, pages = {{4838–4843}}, title = {{{A Two-Phase Approach to Stability of Networks Given in iISS Framework: Utilization of a Matrix-Like Criterion}}}, year = {{2013}}, } @article{40782, abstract = {{Two similar stability notions are considered; one is the long established notion of convergent systems, the other is the younger notion of incremental stability. Both notions require that any two solutions of a system converge to each other. Yet these stability concepts are different, in the sense that none implies the other, as is shown in this paper using two examples. It is shown under what additional assumptions one property indeed implies the other. Furthermore, this paper contains necessary and sufficient characterizations of both properties in terms of Lyapunov functions.}}, author = {{Rüffer, Björn S. and van de Wouw, Nathan and Mueller, Markus}}, journal = {{Systems Control Lett.}}, pages = {{277–285}}, title = {{{Convergent Systems vs. Incremental Stability}}}, doi = {{10.1016/j.sysconle.2012.11.015}}, volume = {{62}}, year = {{2013}}, } @inproceedings{40779, abstract = {{This paper provides sufficient conditions for the incremental stability of time-delayed nonlinear systems. It relies on the Razumikhin-Lyapunov approach, which consists in invoking small-gain arguments by treating the delayed state as a feedback perturbation. The results are valid for multiple delays, as well as bounded time-varying delays. We provide conditions under which the limit solution of a time-delayed nonlinear system to a periodic (resp. constant) input is itself periodic and of the same period (resp. constant). As an illustration, a specific focus is given on a class of delayed Lur’e systems.}}, author = {{Chaillet, Antoine and Yu. Pogromsky, Alexander and Rüffer, Björn S.}}, booktitle = {{Proc. 52nd IEEE Conf. Decis. Control}}, pages = {{1596–1601}}, title = {{{A Razumikhin approach for the incremental stability of delayed nonlinear systems}}}, year = {{2013}}, } @article{40780, author = {{Real, Eusebio and Eguizabal, Alma and Pontón, Alejandro and Díez, Marta Calvo and Val-Bernal, José Fernando and Mayorga, Marta and Revuelta, José M. and López-Higuera, José M. and Conde, Olga M.}}, journal = {{J. Biomed. Opt.}}, number = {{12}}, pages = {{126003–126003}}, title = {{{Optical coherence tomography assessment of vessel wall degradation in thoracic aortic aneurysms}}}, doi = {{10.1117/1.JBO.18.12.126003}}, volume = {{18}}, year = {{2013}}, } @inproceedings{40778, abstract = {{Separable Lyapunov functions play vital roles, for example, in stability analysis of large-scale systems. A Lyapunov function is called max-separable if it can be decomposed into a maximum of functions with one-dimensional arguments. Similarly, it is called sum-separable if it is a sum of such functions. In this paper it is shown that for a monotone system on a compact state space, asymptotic stability implies existence of a max-separable Lyapunov function. We also construct two systems on a non-compact state space, for which a max-separable Lyapunov function does not exist. One of them has a sum-separable Lyapunov function. The other does not.}}, author = {{Rantzer, Anders and Rüffer, Björn S. and Dirr, Gunther}}, booktitle = {{Proc. 52nd IEEE Conf. Decis. Control}}, pages = {{4590–4594}}, title = {{{Separable Lyapunov functions for monotone systems}}}, year = {{2013}}, } @article{40786, author = {{Tong, Jun and Schreier, Peter J.}}, journal = {{IEEE Wireless Comm. Lett.}}, number = {{4}}, pages = {{367–370}}, title = {{{Regularized Preconditioning for Krylov Subspace Equalization of OFDM Systems over Doubly Selective Channels}}}, doi = {{10.1109/WCL.2013.042313.130096}}, volume = {{2}}, year = {{2013}}, }