Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailExponential actions and maximal D-invariant ideals
Molitor-Braun, Carine UL

in Manuscripta Mathematica (1998), 96(1), 23-35

Detailed reference viewed: 25 (0 UL)
Full Text
Peer Reviewed
See detailExponential actions, orbits and their kernels
Ludwig, Jean; Molitor-Braun, Carine UL

in Bulletin of the Australian Mathematical Society (1998), 57

Detailed reference viewed: 117 (0 UL)
Full Text
Peer Reviewed
See detailExponential contraction in Wasserstein distance on static and evolving manifolds
Cheng, Li Juan UL; Thalmaier, Anton UL; Zhang, Shao-Qin

in Revue Roumaine de Mathématiques Pures et Appliquées (2021), 66(1), 107-129

In this article, exponential contraction in Wasserstein distance for heat semigroups of diffusion processes on Riemannian manifolds is established under curvature conditions where Ricci curvature is not ... [more ▼]

In this article, exponential contraction in Wasserstein distance for heat semigroups of diffusion processes on Riemannian manifolds is established under curvature conditions where Ricci curvature is not necessarily required to be non-negative. Compared to the results of Wang (2016), we focus on explicit estimates for the exponential contraction rate. Moreover, we show that our results extend to manifolds evolving under a geometric flow. As application, for the time-inhomogeneous semigroups, we obtain a gradient estimate with an exponential contraction rate under weak curvature conditions, as well as uniqueness of the corresponding evolution system of measures. [less ▲]

Detailed reference viewed: 140 (32 UL)
Full Text
Peer Reviewed
See detailExponential Growth and the Shifting Global Center of Gravity of Science Production, 1900-2011
Zhang, Liang; Powell, Justin J W UL; Baker, David P.

in Change. The Magazine of Higher Learning (2015), 47(4), 46-49

The unprecedented, exponential growth in article production reflects the increased importance of science in countries worldwide. The shifting center of gravity away from the US emphasizes its relative ... [more ▼]

The unprecedented, exponential growth in article production reflects the increased importance of science in countries worldwide. The shifting center of gravity away from the US emphasizes its relative decline as Asian and European countries invest heavily in their national higher education and research capacity. At the same time, cutting-edge knowledge production increasingly relies on building international and intercultural bridges between scholars. Thus, research and development requires investment not only in individuals within organizations but also in the networks, connections, and exchanges that facilitate discoveries. Competition is complemented by collaboration. The simultaneous shift and eastward movement of the centers of economic prosperity and scientific production since the 1950s is not surprising. Economic development provides the resources necessary for scientific production, which in turn spurs further economic growth. Although causality cannot be inferred from this concurrent movement, decades of economic research have shown that education, science, and technology have played crucial and mutually reinforcing roles in economic growth. They are likely to do so even more in an increasingly knowledge-driven global economy. [less ▲]

Detailed reference viewed: 248 (30 UL)
Full Text
Peer Reviewed
See detailExponential integrability and exit times of diffusions on sub-Riemannian and metric measure spaces
Thompson, James UL; Thalmaier, Anton UL

in Bernoulli (2020), 26(3), 2202-2225

In this article we derive moment estimates, exponential integrability, concentration inequalities and exit times estimates for canonical diffusions in two settings each beyond the scope of Riemannian ... [more ▼]

In this article we derive moment estimates, exponential integrability, concentration inequalities and exit times estimates for canonical diffusions in two settings each beyond the scope of Riemannian geometry. Firstly, we consider sub-Riemannian limits of Riemannian foliations. Secondly, we consider the non-smooth setting of RCD*(K,N) spaces. In each case the necessary ingredients are an Ito formula and a comparison theorem for the Laplacian, for which we refer to the recent literature. As an application, we derive pointwise Carmona-type estimates on eigenfunctions of Schrodinger operators. [less ▲]

Detailed reference viewed: 191 (44 UL)
Full Text
Peer Reviewed
See detailExponential Observer-Based Stabilization for a Class of Affine Nonlinear Systems
Ndoye, Ibrahima UL; Zasadzinski, Michel; Radhy, Nour-Eddine et al

in 14th International IEEE/IFAC Conference Methods and Models in Automation and Robotics, MMAR’09botics MMAR'09, Poland, 19 - 21 August 2009 (2009)

In this paper, we investigate the problem of stabilizing a class of nonlinear affine systems by using the generalization of Gronwall-Bellman lemma with two control laws: first a nonlinear state feedback ... [more ▼]

In this paper, we investigate the problem of stabilizing a class of nonlinear affine systems by using the generalization of Gronwall-Bellman lemma with two control laws: first a nonlinear state feedback and second a nonlinear observer-based control. The obtained closed-loop stability is exponential. [less ▲]

Detailed reference viewed: 81 (0 UL)
Full Text
Peer Reviewed
See detailExponential S-Boxes: a Link Between the S-Boxes of BelT and Kuznyechik/Streebog
Perrin, Léo Paul UL; Udovenko, Aleksei UL

in IACR Transactions on Symmetric Cryptology (2017), 2016(2), 99-124

The block cipher Kuznyechik and the hash function Streebog were recently standardized by the Russian Federation. These primitives use a common 8-bit S-Box, denoted 𝜋, which is given only as a look-up ... [more ▼]

The block cipher Kuznyechik and the hash function Streebog were recently standardized by the Russian Federation. These primitives use a common 8-bit S-Box, denoted 𝜋, which is given only as a look-up table. The rationale behind its design is, for all practical purposes, kept secret by its authors. In a paper presented at Eurocrypt 2016, Biryukov et al. reverse-engineered this S-Box and recovered an unusual Feistel-like structure relying on finite field multiplications. In this paper, we provide a new decomposition of this S-Box and describe how we obtained it. The first step was the analysis of the 8-bit S-Box of the current standard block cipher of Belarus, BelT. This S-Box is a variant of a so-called exponential substitution, a concept we generalize into pseudo-exponential substitution. We derive distinguishers for such permutations based on properties of their linear approximation tables and notice that 𝜋 shares some of them. We then show that 𝜋 indeed has a decomposition based on a pseudo-exponential substitution. More precisely, we obtain a simpler structure based on an 8-bit finite field exponentiation, one 4-bit S-Box, a linear layer and a few modular arithmetic operations. We also make several observations which may help cryptanalysts attempting to reverse-engineer other S-Boxes. For example, the visual pattern used in the previous work as a starting point to decompose 𝜋 is mathematically formalized and the use of differential patterns involving operations other than exclusive-or is explored. [less ▲]

Detailed reference viewed: 198 (9 UL)
Full Text
Peer Reviewed
See detailExponential Stability Criteria for Uncertain Stochastic Systems
Li, Yumei UL; Guan, Xinping; Peng, Dan et al

in The 27th Chinese Control Conference (2008)

This paper considers the problem of delay-dependent exponential stability in mean square for a class of stochastic systems with polytopic-type uncertainties and time-varying delay. Based on the ... [more ▼]

This paper considers the problem of delay-dependent exponential stability in mean square for a class of stochastic systems with polytopic-type uncertainties and time-varying delay. Based on the application of the descriptor model transformation and free weighting matrices to express this relationship among the system variables and among the terms in the Newton-Leibniz formula, some new delay-dependent exponential stability criteria are obtained in terms of linear matrix inequalities(LMIs). The new criteria are less conservative than existing ones. Numerical examples demonstrate the new criteria are effective and are an improvement over existing ones. [less ▲]

Detailed reference viewed: 78 (0 UL)
Full Text
Peer Reviewed
See detailExponential Stabilization of a Class of Nonlinear Systems : A Generalized Gronwall-Bellman Lemma Approach
Ndoye, Ibrahima UL; Zasadzinski, Michel; Darouach, Mohamed et al

in Nonlinear Analysis: Theory, Methods & Applications (2011), 74

In this paper, stabilizing control design for a class of nonlinear affine systems is presented by using a new generalized Gronwall-Bellman lemma approach. The nonlinear systems under consideration can be ... [more ▼]

In this paper, stabilizing control design for a class of nonlinear affine systems is presented by using a new generalized Gronwall-Bellman lemma approach. The nonlinear systems under consideration can be non Lipschitz. Two cases are treated for the exponential stabilization: the static state feedback and the static output feedback. The robustness of the proposed control laws with regards to parameter uncertainties is also studied. A numerical example is given to show the effectiveness of the proposed method. [less ▲]

Detailed reference viewed: 126 (8 UL)
Full Text
Peer Reviewed
See detailExponential Synchronization for a New Class of Complex Dynamical Network with PIPC and Hybrid TVD
Pan, Lin UL; Voos, Holger UL; Darouach, Mohamed

in IEEE Multi-Conference on Systems and Control, MSC 2014 (2014, October 08)

Detailed reference viewed: 100 (6 UL)
Peer Reviewed
See detailExport Behavior and Firm Productivity in German Manufacturing - A Firm-Level Analysis
Hussinger, Katrin UL; Arnold, Jens Matthias

in Review of World Economics (2005)

This paper examines the causal relationship between productivity and exporting in German manufacturing. We find a causal link from high productivity to presence in foreign markets, as postulated by a ... [more ▼]

This paper examines the causal relationship between productivity and exporting in German manufacturing. We find a causal link from high productivity to presence in foreign markets, as postulated by a recent literature on international trade with heterogeneous firms. We apply a matching technique in order to analyze whether the presence in international markets enables firms to achieve further productivity improvements, without finding significant evidence for this. We conclude that high-productivity firms self-select themselves into export markets, while exporting itself does not play a significant role for the productivity of German firms. [less ▲]

Detailed reference viewed: 132 (4 UL)
Full Text
Peer Reviewed
See detailExports versus FDI in German Manufacturing: Firm Performance and Participation in International Markets
Arnold, Jens Matthias; Hussinger, Katrin UL

in Review of World Economics (2010)

This paper tests some of the predictions of recent advances in trade theory that have focused on different trade patterns of firms within the same sector. Helpman, Melitz and Yeaple (2005) develop a model ... [more ▼]

This paper tests some of the predictions of recent advances in trade theory that have focused on different trade patterns of firms within the same sector. Helpman, Melitz and Yeaple (2005) develop a model in which innate productivity differences between firms determine the degree of international engagement of firms: The least productive firms produce for the domestic market, better performers engage in export activities, and the top firms establish foreign subsidiaries. Using German firm-level data from 1996 to 2002, we test this prediction using non-parametric methods, by examining the distribution functions of the three subsets of firms for stochastic dominance. Rather than just comparing first moments, this technique allows us to compare productivity over the entire distribution. Our results show robust support for the prediction from theory. [less ▲]

Detailed reference viewed: 145 (2 UL)
Full Text
See detailAs Exposições universais como mídia para a circulação transnacional de saberes sobre o ensino primário na segunda metade do século 19
Dittrich, Klaus UL

in História da educação (2013), 17(41), 213-234

The study examines the approach of cultural transfer thought to the educational field of universal exhibitions during the second half of the 19th century. The issue of knowledge circulation on education ... [more ▼]

The study examines the approach of cultural transfer thought to the educational field of universal exhibitions during the second half of the 19th century. The issue of knowledge circulation on education was adressed and, specially, the progress in primary education, made possible by the movement of some actors, as well as their specific goals around this subject. Focuses on analyzing four countries: Japan, France, Germany and the United States and discuss that cultural transfer on primary school was operated by the sections that, in the universal expositions, explored the progresses on pedagogical objects, written documents, designs of school buildings, as well as models adopted by the exchanges and learning experiences from abroad. Finally, verifies the different sociocultural influences that guided the search for models by those nations. [less ▲]

Detailed reference viewed: 170 (5 UL)
See detailExposition collective
Cicotti, Claudio UL; Portante, Jean; Sacchelli, Oreste et al

Book published by Kulturschapp (2017)

Detailed reference viewed: 46 (1 UL)
Full Text
Peer Reviewed
See detailL’exposition d’objets ou de collections de « marque » : cobranding, réécriture, réénonciation
Schall, Céline UL

in Laval, Sylvie (Ed.) Marques muséales : un espace public revisité ? (in press)

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités  ... [more ▼]

Le cobranding est une pratique habituelle du secteur marchand. Mais lorsque deux musées réalisent ensemble une exposition, peut-on parler de cobranding muséal ? Quelles en seraient les spécificités ? Quels effets peut avoir cette démarche sur la communication ou sur l’exposition ? Notamment, le musée d’accueil s’approprie-t-il simplement l’imaginaire et les valeurs de la marque invitée par un phénomène de « transfert » ? Pour répondre à ces questions, nous étudions trois expositions qui reprennent des objets ou collections de musées dont la marque est internationalement reconnue. L’analyse sémiotique des images de marque du musée d’accueil et du musée invité ainsi que l’analyse sémiopragmatique des expositions montrent l’impact de la présence d’une grande marque internationale sur l’exposition et réciproquement, l’impact de l’exposition sur l’image de marque du musée d’accueil. Plus qu’un simple cobranding, c’est une réécriture impliquant une réénonciation du discours et des valeurs portés par les marques qui est proposée à travers ces expositions. Le processus aboutit à la création de nouveaux espaces symboliques et d’expositions réflexives, avec plusieurs niveaux de lecture. [less ▲]

Detailed reference viewed: 227 (6 UL)
See detailL'Exposition Internationale des Bâtiments (IBA) du Parc de la Emscher Une contribution à la révitalisation du bassin de la Ruhr
Helfer, Malte UL

in Région Urbaine de Lyon (Ed.) Des loisirs de proximité au tourisme - de nouvelles perspectives en région urbaine de Lyon, III.9 (2002)

Detailed reference viewed: 64 (0 UL)
Full Text
Peer Reviewed
See detailThe exposome and health: Where chemistry meets biology
Vermeulen, Roel; Schymanski, Emma UL; Barabási, Albert-László et al

in Science (2020), 367(6476), 392--396

Despite extensive evidence showing that exposure to specific chemicals can lead to disease, current research approaches and regulatory policies fail to address the chemical complexity of our world. To ... [more ▼]

Despite extensive evidence showing that exposure to specific chemicals can lead to disease, current research approaches and regulatory policies fail to address the chemical complexity of our world. To safeguard current and future generations from the increasing number of chemicals polluting our environment, a systematic and agnostic approach is needed. The \textquotedblleftexposome\textquotedblright concept strives to capture the diversity and range of exposures to synthetic chemicals, dietary constituents, psychosocial stressors, and physical factors, as well as their corresponding biological responses. Technological advances such as high-resolution mass spectrometry and network science have allowed us to take the first steps toward a comprehensive assessment of the exposome. Given the increased recognition of the dominant role that nongenetic factors play in disease, an effort to characterize the exposome at a scale comparable to that of the human genome is warranted. [less ▲]

Detailed reference viewed: 181 (2 UL)
Peer Reviewed
See detailExposure to Sexualized Pictures Primes Occupational Stereotypes
Melzer, André UL; Ramsperger, Stephan

Scientific Conference (2017, September 05)

Gender stereotypes in advertisements, magazines, or videogames often appear in the form of sexualized portrayals of women characterized by inappropriately foregrounding female sexuality. Women are shown ... [more ▼]

Gender stereotypes in advertisements, magazines, or videogames often appear in the form of sexualized portrayals of women characterized by inappropriately foregrounding female sexuality. Women are shown with highly revealing clothing and engaging in seductive acts. Sexualization may serve as a motivator to adopt congruent gender-related stereotypes in the viewers and, thus, influence beliefs about women in the real world, including negative effects on self-efficacy of women (Behm-Morawitz & Mastro, 2009). In two studies, sexualization had similar adverse effects on participants’ spontaneous judgments of occupational stereotypes and job classification. In a field study (Study 1, N=128), sexualized female game characters were spontaneously associated with jobs of lower prestige (e.g., hairdresser). In contrast, non-sexualized portrayals were linked to jobs of higher status (i.e., physician, educator). This detrimental effect of sexualized portrayal on occupational status was replicated for depictions of male and female fashion models in an online survey (Study 2, N=459). Moreover, this effect was partially mediated by ratings of lower perceived competence for sexualized portrayals of both men and women. The findings of the present studies extend the multifaceted negative effects of sexualization on stereotyping by showing that the resulting spontaneous competence judgments may have detrimental job-related consequences. [less ▲]

Detailed reference viewed: 82 (4 UL)