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Suche nach „[2015]“ hat 276 Publikationen gefunden
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    DigitalF: Angewandte Informatik

    Zeitschriftenartikel

    J. Li, A. Wang, Wang, J., Marcus Barkowsky, P. Le Callet

    Visual Discomfort Induced by Three-Dimensional Display Technology (in Chinese)

    Laser and Optoelectronics Progress, vol. 52, no. 3

    2015

    DigitalF: Angewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    K. Berger, Y. Koudota, Marcus Barkowsky, P. Le Callet

    Subjective Quality Assessment Comparing UHD and HD Resolution in HEVC Transmission Chain

    2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX)

    2015

    Abstract anzeigen

    Ultra High Definition Television (UHDTV) is an emerging broadcasting system, aiming to replace the current High Definition Television (HDTV) in the near future. One aspect of UHDTV is to allow for higher resolutions, notably UHD1, which requires a four times increased datarate for uncompressed transmission compared to Full-HD resolution. As bandwidth for transmission channels in television broadcast is often a fixed value, this study provides information about the perceived quality for transmitting UHD1 content compared to Full-HD content at the same bitrate encoded with HEVC. Content influence is tested with 15 video contents and 4 bitrates are individually chosen per content to span the range of the perceptual scale. The methodology of Absolute Category Rating with Hidden Reference (ACR-HR) is used to collect votes from 24 viewers. The statistical analysis of the collected data shows that, in most cases, there is no significant quality difference between videos transmitted in Full-HD and UHD1 resolution but that the results strongly depend on the content type and on the capture quality. It is also shown that the required bitrate for achieving a chosen broadcast quality level varies with content by a factor of about 14 in HEVC coding.

    DigitalF: Angewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    G. van Wallendael, N. Staelens, E. Masala, Marcus Barkowsky

    Full-HD HEVC-Encoded Video Quality Assessment Database

    Ninth International Workshop on Video Processing and Quality Metrics (VPQM) [Feb 2015; Chandler, AZ, USA]

    2015

    DigitalF: Angewandte Informatik

    Zeitschriftenartikel

    Marcus Barkowsky, E. Masala, G. van Wallendael, K. Brunnström, N. Staelens, P. Le Callet

    Objective Video Quality Assessment ‐- Towards Large Scale Video Database Enhanced Model Development

    IEICE Transactions on Communications, vol. E-98b, no. 1, pp. 2-11

    2015

    Abstract anzeigen

    The current development of video quality assessment algorithms suffers from the lack of available video sequences for training, verification and validation to determine and enhance the algorithm's application scope. The Joint Effort Group of the Video Quality Experts Group (VQEG-JEG) is currently driving efforts towards the creation of large scale, reproducible, and easy to use databases. These databases will contain bitstreams of recent video encoders (H.264, H.265), packet loss impairment patterns and impaired bitstreams, pre-parsed bitstream information into files in XML syntax, and well-known objective video quality measurement outputs. The database is continuously updated and enlarged using reproducible processing chains. Currently, more than 70,000 sequences are available for statistical analysis of video quality measurement algorithms. New research questions are posed as the database is designed to verify and validate models on a very large scale, testing and validating various scopes of applications, while subjective assessment has to be limited to a comparably small subset of the database. Special focus is given on the principles guiding the database development, and some results are given to illustrate the practical usefulness of such a database with respect to the detailed new research questions.

    DigitalF: Bauingenieurwesen und Umwelttechnik

    Zeitschriftenartikel

    Gerd Maurer

    Digitale Integrale Planung. Ziele und Erfolgsfaktoren einer BIM-gestützten Gebäudeplanung

    Umrisse, no. 2-3, pp. 22-26

    2015

    F: Angewandte Wirtschaftswissenschaften

    Buch (Monographie)

    S. Müllbacher, Wolfgang Nagl

    Distributional and Incentive Effects of the Austrian Pension System

    Studie im Auftrag von Global Equity Partners

    2015

    F: Angewandte Wirtschaftswissenschaften

    Buch (Monographie)

    Wolfgang Nagl, H. Hofer

    Zumutbarkeitsbestimmungen auf dem österreichischen Arbeitsmarkt

    Studie im Auftrag des Bundesministeriums der Finanzen

    2015

    F: Angewandte Wirtschaftswissenschaften

    Buch (Monographie)

    A. Eck, S. Gralka, J. Heller, Wolfgang Nagl, J. Ragnitz

    Hochschulfinanzierung in Mecklenburg-Vorpommern

    ifo Dresden Studien, München, vol. 75

    2015

    ISBN: 978-3-88512-561-7

    Abstract anzeigen

    Im Land Mecklenburg-Vorpommern finden sich zwei staatliche (Voll-)Universitäten, drei staatliche Fachhochschulen und eine staatliche Hochschule für Musik und Theater. Im Vergleich zu den Einnahmen des Landes steigen die Finanzmittel der Hochschulen überproportional. Im Rahmen des Forschungsprojektes sollte deshalb die Finanzmittelausstattung und die Leistung der Hochschulen in Mecklenburg-Vorpommern vergleichend untersucht werden. Dabei wurden die Finanzierung der Hochschulen im Allgemeinen, die Verteilung der Finanzmittel sowie die Qualität der Lehre und Forschung sowohl im Ländervergleich als auch gegenüber ausgewählten einzelnen Vergleichshochschulen analysiert.

    F: Angewandte Wirtschaftswissenschaften

    Buch (Monographie)

    E. Delkic, A. Kemnitz, J. Kluge, G. Marquart, T. Motzek, Wolfgang Nagl, M. Thum, P. Zwerschke

    Auswirkungen des demografischen Wandels im Einwanderungsland Deutschland

    Studie im Auftrag der Abteilung Wirtschafts- und Sozialpolitik der Friedrich-Ebert-Stiftung (Hrsg.): Gesprächskreis Migration und Integration

    2015

    DigitalF: Angewandte WirtschaftswissenschaftenS: TC Grafenau

    Zeitschriftenartikel

    Michael Scholz, V. Dorner, M. Franz, O. Hinz

    Measuring consumers' willingness to pay with utility-based recommendation systems

    Decision Support Systems, vol. 72, no. April

    2015

    DOI: 10.1016/j.dss.2015.02.006

    Abstract anzeigen

    Our paper addresses two gaps in research on recommendation systems: first, leveraging them to predict consumers' willingness to pay; second, estimating non-linear utility functions – which are generally held to provide better approximations of consumers' preference structures than linear functions – at a reasonable level of cognitive consumer effort. We develop an approach to simultaneously estimate exponential utility functions and willingness to pay at a low level of cognitive consumer effort. The empirical evaluation of our new recommendation system's utility and willingness to pay estimates with the estimates of a system based on linear utility functions indicates that exponential utility functions are better suited for predicting optimal recommendation ranks for products. Linear utility functions perform better in estimating consumers' willingness to pay. Based on our experimental data set, we show how retailers can use these willingness to pay estimates for profit-maximizing pricing decisions.

    DigitalI: Zentrum für Akademische WeiterbildungP: DEG-DLM1

    Buch (Monographie)

    Karina Fisch, Martina Reitmaier-Krebs

    Bedarf an didaktischer Gestaltung von Lernprozessen in berufsbegleitenden Weiterbildungen

    2015

    MobilF: Angewandte InformatikS: TC Grafenau

    Vortrag

    Christian Kluge

    Optimierung der Reichweitenschätzung für Elektrofahrzeuge im Verbundprojekt E-WALD

    E-WALD Projekttag, Teisnach

    2015

    MobilNachhaltigS: TC Plattling MoMo

    Vortrag

    A. Dunst, Michael Sternad, V. Epp, M. Wilkening

    Fast Li Self-Diffusion in Amorphous Li-Si Electrochemically Prepared from Semiconductor Grade, Monocrystalline Silicon — Insights from Spin-Locking Nuclear Magnetic Relaxometry

    Poster presentation

    20th International Conference on Solid State Ionics, Keystone, CO, USA

    2015

    MobilNachhaltigS: TC Plattling MoMo

    Patent

    Michael Sternad, K. Rowold

    Zelle eines Energiespeichers für ein Fahrzeug

    2015

    MobilNachhaltigS: TC Plattling MoMo

    Patent

    Michael Sternad, M. Forster, K. Schmut, B. Goller, Zieger G., M. Sorger, et al.

    LITHIUM BATTERY, METHOD FOR MANUFACTURING A LITHIUM BATTERY, INTEGRATED CIRCUIT AND METHOD OF MANUFACTURING AN INTEGRATED CIRCUIT

    2015

    MobilNachhaltigS: TC Plattling MoMo

    Zeitschriftenartikel

    W. Schmidt, P. Bottke, Michael Sternad, P. Gollob, V. Hennige, M. Wilkening

    Small Change—Great Effect: Steep Increase of Li Ion Dynamics in Li 4 Ti 5 O 12 at the Early Stages of Chemical Li Insertion

    Chemistry of Materials, vol. 27, no. 5, pp. 1740-1750

    2015

    DOI: 10.1021/cm504564k

    Abstract anzeigen

    Lithium titanate (LTO) is one of the most promising anode materials for large-scale stationary electrochemical storage of energy produced from renewable sources. Besides many other aspects, such as negligible formation of passivation layers and no volume expansion during lithiation, the success of LTO is mainly based on its ability to easily accommodate and release Li ions in a fully reversible way. This feature is tightly connected with Li self-diffusion. As yet, little information is available about microscopic Li diffusion properties and elementary steps of Li hopping at low intercalation levels, i.e., at values of x being significantly smaller than 1. Here, we used 7Li spin-locking NMR relaxometry to probe absolute hopping rates of LTO (homogeneous) solid solutions in quasi-thermodynamic equilibrium. As a result, the largest increase of Li diffusivity is observed when small amounts of Li are inserted. Strong Coulomb repulsions caused by the simultaneous occupation of neighboring 8a and 16c sites serve as an explanation for the enhanced Li diffusivity found. At even larger values of x, Li mobility slows down but is still much faster than in the host material with x = 0. Our results experimentally corroborate the outcome of recently published calculations on the DFT level focusing on both dynamic and structural aspects. The findings favor the formation of LTO solid solutions upon chemical lithiation; the steep increase in Li diffusivity found might also help with understanding the flat insertion potential observed.

    MobilNachhaltigS: TC Plattling MoMo

    Zeitschriftenartikel

    J. Langer, V. Epp, Michael Sternad, M. Wilkening

    Diffusion-induced 7Li NMR relaxation of layer-structured tin disulphide — Li diffusion along the buried interfaces in Li0.17SnS2

    Solid State Ionics, vol. 276, no. August, pp. 56-61

    2015

    DOI: 10.1016/j.ssi.2015.03.039

    Abstract anzeigen

    7Li NMR relaxation has been used to study lithium-ion diffusion in layer-structured SnS2. Keeping the Li intercalation degree in LixSnS2 below x = 0.49, the Li ions preferentially occupy sites in the van der Waals gap between the SnS2 sheets. In contrast to conventional NMR spin-lattice relaxation (SLR) rate measurements in the laboratory frame of reference, which are sensitive to rather fast Li exchange processes, with the help of spin-locking SLR NMR slower Li motions were extracted from characteristic diffusion-induced rate peaks. The latter contain information on both Li+ activation energies Ea and Li ion jump rates τ− 1 characterizing the elementary steps of Li+ hopping. Our results point to two different diffusion processes (Ea(I) = 0.38 eV; Ea(II) = 0.28 eV), a slower and a faster one, observable directly after chemical Li insertion. Interestingly, the diffusion behaviour irreversibly changes when the sample has been exposed to temperatures as high as 573 K. Diffusion-induced NMR rates and corresponding line shapes are discussed with respect to an inhomogenous distribution of Li ions in SnS2, which seems to be present directly after Li intercalation.

    MobilNachhaltigS: TC Plattling MoMo

    Zeitschriftenartikel

    A. Dunst, Michael Sternad, V. Epp, M. Wilkening

    Fast Li+ Self-Diffusion in Amorphous Li–Si Electrochemically Prepared from Semiconductor Grade, Monocrystalline Silicon: Insights from Spin-Locking Nuclear Magnetic Relaxometry

    The Journal of Physical Chemistry C, vol. 119, no. 22, pp. 12183-12192

    2015

    DOI: 10.1021/acs.jpcc.5b02490

    Abstract anzeigen

    Silicon is one of the most promising anode materials for lithium-based rechargeable batteries. Provided the volume changes during Li uptake can be brought under control, Li ion diffusivity is expected to crucially determine the performance of such next-generation energy storage systems. Therefore, studying diffusion properties in e.g. amorphous Li–Si underpins applied research that is being directed toward the development of powerful storage devices. So far, only little information is available on Li+ self-diffusion in amorphous Si. Here, we used 7Li NMR spectroscopy to precisely quantify microscopic activation energies and Li jump rates in amorphous Li–Si which is primarily formed if monocrystalline Si is lithiated electrochemically. Surprisingly, our results reveal relatively fast Li ion diffusivity with low activation energies for localized Li+ motions being in agreement with results from theory. The average activation energy for long-range ion transport is as high as ca. 0.65 eV; jump rates turn out to be in the order of 2.5 × 105 s–1 at 246 K. Our results point to complex dynamics that is most likely governed by nonexponential motional correlation functions originating from a distribution of activation energies. The data obtained might help optimizing Li-based silicon batteries whose performance critically depend on fast Li ion transport.

    MobilNachhaltigS: TC Plattling MoMo

    Vortrag

    A. Dunst, Michael Sternad, V. Epp, M. Wilkening

    Lithium ion dynamics in amorphous Li-Si electrochemically prepared from semiconductor grade, monocrystalline silicon — An NMR Study

    Poster presentation

    Materials Day 2015, Graz, Österreich

    2015