References of "2013"
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See detailZwischen Politik, Polemik und Partizipation. Schule und Schulreform im Tageblatt.
Lenz, Thomas UL; Voss, Peter UL

in Scuto, Denis; Steichen, Yves; Lesch, Paul (Eds.) Un journal dans son siècle. Tageblatt 1913-2013. (2013)

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See detailMarket Perceptions of US and European policy actions around the subprime crisis
Lehnert, Thorsten UL

Scientific Conference (2013, December)

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See detailMulti-precision Squaring for Public-Key Cryptography on Embedded Microprocessors
Seo, Hwajeong; Liu, Zhe UL; Choi, Jongseok et al

in The 14th International Conference on Cryptology in India -- INDOCRYPT 2013 (2013), 8250

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See detailSNR Estimation for Multi-dimensional Cognitive Receiver under Correlated Channel/Noise
Sharma, Shree Krishna UL; Chatzinotas, Symeon UL; Ottersten, Björn UL

in IEEE Transactions on Wireless Communications (2013), 12(12), 6392-6405

In addition to Spectrum Sensing (SS) capability required by a Cognitive Radio (CR), Signal to Noise Ratio (SNR) estimation of the primary signals at the CR receiver is crucial in order to adapt its ... [more ▼]

In addition to Spectrum Sensing (SS) capability required by a Cognitive Radio (CR), Signal to Noise Ratio (SNR) estimation of the primary signals at the CR receiver is crucial in order to adapt its coverage area dynamically using underlay techniques. In practical scenarios, channel and noise may be correlated due to various reasons and SNR estimation techniques with the assumption of white noise and uncorrelated channel may not be suitable for estimating the primary SNR. In this paper, firstly, we study the performance of different eigenvaluebased SS techniques in the presence of channel or/and noise correlation. Secondly, we carry out detailed theoretical analysis of the signal plus noise hypothesis to derive the asymptotic eigenvalue probability distribution function (a.e.p.d.f.) of the received signal’s covariance matrix under the following two cases: (i) correlated channel and white noise, and (ii) correlated channel and correlated noise, which is the main contribution of this paper. Finally, an SNR estimation technique based on the derived a.e.p.d.f is proposed in the presence of channel/noise correlation and its performance is evaluated in terms of normalized Mean Square Error (MSE). It is shown that the PU SNR can be reliably estimated when the CR sensing module is aware of the channel/noise correlation. [less ▲]

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See detailImproving Portfolio Selection Using Option-Implied Volatility and Skewness
DeMiguel, Victor; Plyakha, Yuliya UL; Uppal, Raman et al

in Journal of Financial and Quantitative Analysis (2013), 48(06), 1813-1845

Our objective in this paper is to examine whether one can use option-implied information to improve the selection of mean-variance portfolios with a large number of stocks, and to document which aspects ... [more ▼]

Our objective in this paper is to examine whether one can use option-implied information to improve the selection of mean-variance portfolios with a large number of stocks, and to document which aspects of option-implied information are most useful to improve their out-of-sample performance. Portfolio performance is measured in terms of volatility, Sharpe ratio, and turnover. Our empirical evidence shows that using option-implied volatility helps to reduce portfolio volatility. Using option-implied correlation does not improve any of the metrics. Using option-implied volatility, risk premium, and skewness to adjust expected returns leads to a substantial improvement in the Sharpe ratio, even after prohibiting short sales and accounting for transaction costs. [less ▲]

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See detailDeveloping number–space associations: SNARC effects using a color discrimination task in 5-year-olds
Hoffmann, Danielle UL; Hornung, Caroline UL; Martin, Romain UL et al

in Journal of Experimental Child Psychology (2013), 116

Human adults’ numerical representation is spatially oriented; consequently, participants are faster to respond to small/large numerals with their left/right hand, respectively, when doing a binary ... [more ▼]

Human adults’ numerical representation is spatially oriented; consequently, participants are faster to respond to small/large numerals with their left/right hand, respectively, when doing a binary classification judgment on numbers, known as the SNARC (spatial– numerical association of response codes) effect. Studies on the emergence and development of the SNARC effect remain scarce. The current study introduces an innovative new paradigm based on a simple color judgment of Arabic digits. Using this task, we found a SNARC effect in children as young as 5.5 years. In contrast, when preschool children needed to perform a magnitude judgment task necessitating exact number knowledge, the SNARC effect started to emerge only at 5.8 years. Moreover, the emergence of a magnitude SNARC but not a color SNARC was linked to proficiency with Arabic digits. Our results suggest that access to a spatially oriented approximate magnitude representation from symbolic digits emerges early in ontogenetic development. Exact magnitude judgments, on the other hand, rely on experience with Arabic digits and, thus, necessitate formal or informal schooling to give access to a spatially oriented numerical representation. [less ▲]

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See detailProtocols and Stability Analysis for Energy Harvesting TDMA Systems with/without Relaying
Ottersten, Björn UL; Krikidis, Ioannis; Zheng, Gan UL

in IEEE Global Telecommunications Conference (GLOBECOM) (2013, December)

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See detailLe plein office du juge et le rôle des parties
Menetrey, Séverine UL

in JurisNews – Arbitrage et procédure civile (2013)

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See detailSingular spectrum analysis for modeling seasonal signals from GPS time series
Chen, Qiang; van Dam, Tonie UL; Sneeuw, Nico et al

in Journal of Geodynamics (2013), 72

Seasonal signals in GPS time series are of great importance for understanding the evolution of regional mass fluctuations, i.e., ice, hydrology, and ocean mass. Conventionally these signals quasi-annual ... [more ▼]

Seasonal signals in GPS time series are of great importance for understanding the evolution of regional mass fluctuations, i.e., ice, hydrology, and ocean mass. Conventionally these signals quasi-annual and semi-annual signals are modeled by least-squares fitting harmonic terms with a constant amplitude and phase. In reality, however, such seasonal signals are modulated, i.e., they will have a time-variable amplitude and phase. Recently, Davis et al.(2012) proposed a Kalman filter based approach to capture the stochastic seasonal behavior of geodetic time series. Singular Spectrum Analysis (SSA) is a non-parametric method, which uses time domain data to extract information from short and noisy time series without a priori knowledge of the dynamics affecting the time series. A prominent benefit is that trends obtained in this way are not necessarily linear. Further, true oscillations can be amplitude and phase modulated. In this work, we will assess the value of SSA for extracting time-variable seasonal signals from GPS time series. We compare our SSA-based results to those obtained using 1) least-squares analysis and 2) Kalman filtering. Our results demonstrate that SSA is a viable and complementary tool for extracting modulated oscillations from GPS time series. [less ▲]

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See detailSuburbaner Raum im Lebenszyklus
Reicher, Christa; Hesse, Markus UL

Report (2013)

The central part of the study deals with the question of how to approach the temporarily differentiated development dynamics of suburban spaces within a systematic, conceptual analysis framework. The ... [more ▼]

The central part of the study deals with the question of how to approach the temporarily differentiated development dynamics of suburban spaces within a systematic, conceptual analysis framework. The temporal variation and trajectory analysis however remains descriptive in this study, as the method still has not been developed into an autonomous explanatory system. The study concentrates on the integration of the particular phases and cycles into a broader context of the suburban system and - as far as possible - to describe interdependencies of trigger factors as well as of the local and regional framework. This makes the approach different to a static spatial analysis. Those phases contain, in most cases, the Growth, Maturity, Transition and Resiliency. The latter describes the capability of a system to encounter decline or even to reach a development turn. The phases develop into cycles when temporal periodic changes occur, following a certain logic determined by definable factors and strategies. [less ▲]

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See detailA Systematic Review of Model-Driven Security
Nguyen, Phu Hong UL; Klein, Jacques UL; Kramer, Max et al

in The 20th Asia-Pacific Software Engineering Conference Proceedings (2013, December)

To face continuously growing security threats and requirements, sound methodologies for constructing secure systems are required. In this context, Model-Driven Security (MDS) has emerged since more than a ... [more ▼]

To face continuously growing security threats and requirements, sound methodologies for constructing secure systems are required. In this context, Model-Driven Security (MDS) has emerged since more than a decade ago as a specialized Model-Driven Engineering approach for supporting the development of secure systems. MDS aims at improving the productivity of the development process and quality of the resulting secure systems, with models as the main artifact. This paper presents how we systematically examined existing published work in MDS and its results. The systematic review process, which is based on a formally designed review protocol, allowed us to identify, classify, and evaluate different MDS approaches. To be more specific, from thousands of relevant papers found, a final set of the most relevant MDS publications has been identified, strictly selected, and reviewed. We present a taxonomy for MDS, which is used to synthesize data in order to classify and evaluate the selected MDS approaches. The results draw a wide picture of existing MDS research showing the current status of the key aspects in MDS as well as the identified most relevant MDS approaches.We discuss the main limitations of the existing MDS approaches and suggest some potential research directions based on these insights. [less ▲]

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See detailQuantification of Financial News for Economic Surveys
Minev, Mihail UL

in International Conference on Data Mining Workshops (2013, December)

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See detailOn the capability to derive mass estimates from high-low satellite-to-satellite tracking data
Weigelt, Matthias UL; van Dam, Tonie UL; Tourian, M. J. et al

Poster (2013, December)

Recently it has been shown that it is possible to derive time-variable gravity signals from high-low satellite-to-satellite tracking (hl-SST) missions (Weigelt et al. 2013, JGR:Solid Earth, doi:10.1002 ... [more ▼]

Recently it has been shown that it is possible to derive time-variable gravity signals from high-low satellite-to-satellite tracking (hl-SST) missions (Weigelt et al. 2013, JGR:Solid Earth, doi:10.1002/jgrb.50283). Based on the GPS information only, we will present results derived from the dedicated gravity field missions CHAMP, GRACE and GOCE which allow us to determine mass estimates for various applications. Hydrologically induced mass changes on land cause the strongest mass variations in the gravity field and can be easily identified in the hl-SST data, especially in areas with strong signals such as the Amazon basin. Ice melt in Greenland can be derived from the data and mass estimates compare well to corresponding GRACE estimates. Also, loading time series based on these gravity field solutions agree well with GPS observations for various stations around the globe. We also discuss the limitations of the data, e.g. in detecting signals related to glacial isostatic adjustment or earthquake-induced gravity field changes. Overall, we will demonstrate that the quality of the GPS data is sufficient nowadays and with a proper processing strategy it is possible to derive reasonable mass estimates. As such, this type of observations may allow to bridge a possible gap between GRACE and its successor GRACE Follow-On scheduled for launch in 2017. [less ▲]

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See detailEnhanced Service Delivery for Cognitive Systems within Multiple Antenna Scenarios
Hassouneh, Nesreen; Alodeh, Maha UL

in IEEE Jordan Conference on Applied Electrical Engineering and Computing Technologies (2013, December)

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See detailInvited talk - Schulübergangsentscheidung in Luxemburg
Krolak-Schwerdt, Sabine UL

Conference given outside the academic context (2013)

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See detailKonsekvenser av att EU:s institutioner genom direkt tillämplig sekundärlagstiftning begränsar rätten att ta del av allmänna handlingar i Sverige
Östlund, Allison UL; Hallberg, Jonas

in Förvaltningsrättslig tidskrift (2013), 4(2013), 457-478

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See detailLes Épreuves Standardisées vues par les acteurs du terrain. Étude exploratoire.
Milmeister, Marianne UL; Milmeister, Paul UL; Weis, Christiane UL

Report (2013)

Afin de dépasser le stade des hypothèses, il a été décidé de récolter des informations quantitatives (au moyen d'un questionnaire à large échelle) et qualitatives (au travers de focus groups) quant à la ... [more ▼]

Afin de dépasser le stade des hypothèses, il a été décidé de récolter des informations quantitatives (au moyen d'un questionnaire à large échelle) et qualitatives (au travers de focus groups) quant à la façon dont sont perçues et utilisées les Épreuves Standardisées. Le but en est de mieux comprendre comment les différents acteurs concernés (directeurs, inspecteurs, enseignants, élèves et parents) perçoivent le dispositif des Épreuves Standardisées et tiennent compte des informations qui leur sont envoyées en retour (rapport NATIONAL, rapport ECOLE, rapport CLASSE, rapports ELEVE). Une attention particulière est portée à la compréhension et l'usage des rapports mis à disposition ainsi qu'aux éventuelles pistes d'amélioration de l'outil proposées par les acteurs concernés. Le présent document synthétise la phase exploratoire de l'étude qualitative (menée en 2013) en présentant (1) les guides d'entretien utilisés (et leur modification) et (2) une première analyse quant aux contenus développés par les personnes interrogées. [less ▲]

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See detailInégalités de formation lors de l’accès à l’enseignement supérieur selon le sexe et le contexte migratoire: résultats de l’analyse des situations suisse, allemande et française
Griga, Dorit; Hadjar, Andreas UL

in Schweizerische Zeitschrift fur Bildungswissenschaften = Rivista Svizzera di Scienze dell'Educazione = Revue Suisse des Sciences de l'Education (2013), 35(3), 493-513

The paper deals with the transition to Higher Education focusing on educational inequalities at the intersection of gender and migrant background. At the core of the analyses, theorized referring to ... [more ▼]

The paper deals with the transition to Higher Education focusing on educational inequalities at the intersection of gender and migrant background. At the core of the analyses, theorized referring to decision theory, is a comparison of Switzerland (TREE), Germany (HIS-Studienberechtigte 2002) and France (Panel d’élèves du second degré 1995). Results indicate increased transition rates to Higher Education for second-generation males from some socially disadvantaged migrant groups for Switzerland and Germany, if controlled for social origin. Evidence confirming a female disadvantage for second generation females originating from countries characterised by a rather patriarchal culture were not found in any of the countries under consideration. [less ▲]

Detailed reference viewed: 128 (6 UL)