Value Stream Management in the "Lean Manufacturing Laboratory"

Presentation (2015, July 08)

A Bayesian inversion approach to recovering material parameters in hyperelastic solids using dolfin-adjoint

Presentation (2015, July 01)

In the first part of the talk I will describe in general terms the link between classical optimisation techniques and the Bayesian approach to statistical inversion as outlined in the seminal book of ... [more ▼]

In the first part of the talk I will describe in general terms the link between classical optimisation techniques and the Bayesian approach to statistical inversion as outlined in the seminal book of [Kaipio and Somersalo, 2005]. Under the assumption of an additive Gaussian noise model, a Gaussian prior distribution and a linear parameter-to-observable map, it is possible to uniquely characterise the Bayesian posterior as Gaussian with the maximum aposteriori (MAP) point equal to the minimum of a classic regularised minimisation problem and covariance matrix equal to the inverse of the Hessian of the functional evaluated at the MAP point. I will also discuss techniques that can be used when these assumptions break down. In the second part of the talk I will describe a method implemented within dolfin-adjoint [Funke and Farrell, arXiv 2013] to quantify the uncertainty in the recovered material parameters of a hyperelastic solid from partial and noisy observations of the displacement field in the domain. The finite element discretisation of the adjoint and higher-order adjoint (Hessian) equations are derived automatically from the high-level UFL representation of the problem. The resulting equations are solved using PETSc. I will concentrate on finding the eigenvalue decomposition of the posterior covariance matrix (Hessian). The eigenvectors associated with the lowest eigenvalues of the Hessian correspond with the directions in parameter space least constrained by the observations [Flath et al. 2011]. This eigenvalue problem is tricky to solve efficiently because the Hessian is very large (on the order of the number of parameters) and dense (meaning that only its action on a vector can be calculated, each involving considerable expense). Finally, I will show some illustrative examples including the uncertainty associated with deriving the material properties of a 3D hyperelastic block with a stiff inclusion with knowledge only of the displacements on the boundary of the domain. J. Kaipio and E. Somersalo, Statistical and Computational Inverse Problems, vol. 160. New York: Springer-Verlag, 2005. S. W. Funke and P. E. Farrell, “A framework for automated PDE-constrained optimisation,” arXiv:1302.3894 [cs], Feb. 2013. H. P. Flath, L. C. Wilcox, V. Akçelik, J. Hill, B. van Bloemen Waanders, and O. Ghattas, “Fast Algorithms for Bayesian Uncertainty Quantification in Large-Scale Linear Inverse Problems Based on Low-Rank Partial Hessian Approximations,” SIAM J. Sci. Comput., vol. 33, no. 1, pp. 407–432, Feb. 2011. [less ▲]

Migrant Workers and Illegality - A European Perspective

Presentation (2015, June 30)

Freezing and confiscation of proceeds of crime: making use of the new EU Directive

Presentation (2015, June 24)

Regenbogenfamilien: Forschungsfelder und Befunde zu Kindern in gleichgeschlechtlichen Partnerschaften

Presentation (2015, June 18)

Leben an der Grenze: die Großregion SaarLorLux - Chancen und Herausforderungen grenzüberschreitender Mobilität in der Praxis

Presentation (2015, June 15)

This presentation gave an overview about the geographical development of the Greater Region and population and settlement development in this region.

Integrated likelihood based inference for nonlinear panel data models with unobserved effects

Presentation (2015, June 10)

MicroDYN and MicroFIN

Presentation (2015, June 06)

Colloquium: Moulding New Citizens for 20th Century Europe? A Comparison of Elite Training in the Belgian-German and Polish-German Borderlands (1920-1940 and 1945-1960)

Presentation (2015, June 04)

Some naturally defined star products on Kaehler manifolds

Presentation (2015, June 04)

An overview of the limitations to the dissemination of data

Presentation (2015, June 03)

The changes occurred during the last decades have made data one of the most important business assets. With this evolution, together with the no man's land that the Internet was in its early years, came ... [more ▼]

The changes occurred during the last decades have made data one of the most important business assets. With this evolution, together with the no man's land that the Internet was in its early years, came the awareness of the inherent dangers and potential damages involved in collecting and transferring data. Therefore, the attention of lawmakers has focused more and more on addressing the various risks related to this new asset. Limitations exist under different perspectives, sometimes protecting private interests, sometimes public. Rules impose limitations on the basis of traffic in arms; trade secret; copyright and author's rights; and, most prominently, the protection of personal data. The last topic is particularly complex. The Internet has drastically changed the landscape for the protection of personal data, and the existing patchwork of rules is no longer adequate. The very ownership of the data has been overthrown, making it hard to understand where liability rests. The changing context calls for a major revision of the existing rules on data protection. The European Union is discussing the reform, with provisions that are more high-level, but introducing significant penalties for violations. However, the reform is facing delays and difficulties, and it is still unknown when it will enter into force. [less ▲]

Motorisches Lernen im Kindes- und Jugendalter

Presentation (2015, June)

Heureux fuyeurs, Ignobles fuyards. Imaginaires politiques du déracinement de Gide à Le Clézio

Presentation (2015, June)

Parafermions in time-reversal invariant topological insulators

Presentation (2015, June)

Dissipation in a crystallization process

Presentation (2015, June)

Promoting solidarity in crisis times: Building on the EU Budget and the EU Funds

Presentation (2015, June)

Deference in International Courts and Tribunals

Presentation (2015, May 27)

University Competition and Transnational Education: The Choice of Branch Campus

Presentation (2015, May 26)

Bridging Democracy and Human Rights: Perspectives from Strasbourg

Presentation (2015, May 21)

Identität und sexuelle Orientierung: Empirisch-psychologische Forschung nicht nur zum Coming Out

Presentation (2015, May 21)

Differentiating Equality? The different advancements in the protected grounds in the case law of the Court of Justice

Presentation (2015, May 18)

Lehr-und Lernforschung: Perspektiven von AES und dem BScE

Presentation (2015, May 16)

A tutorial on multiple crack growth and intersections with XFEM

Presentation (2015, May 12)

LuST: a 24-hour Scenario of Luxembourg City for SUMO Traffic simulations

Presentation (2015, May 07)

Various vehicular communities ranging from telecommunication to infrastructure are working on problems related to traffic congestion, intelligent transportation systems, and mobility patterns using ... [more ▼]

Various vehicular communities ranging from telecommunication to infrastructure are working on problems related to traffic congestion, intelligent transportation systems, and mobility patterns using information collected from a variety of sensors. In order to test the solutions, the first step is to use a vehicular traffic simulator and an appropriate scenario. Many mobility simulators are available, but a common problem is finding a realistic traffic scenario. The aim of this work is to provide a scenario able to meet all the common requirements in terms of size, realism and duration, in order to have a common basis for the evaluations. In the interest of building a realistic scenario, we decided to start from a real city with a standard topology common in mid-size European cities, and real information concerning traffic demands and mobility patterns. In this paper we show the process used to build the Luxembourg SUMO Traffic (LuST) Scenario, and present a summary of its characteristics together with an overview of its possible uses. [less ▲]

Mixed-Methods Approach

Presentation (2015, May 05)

Percolation Revisited

Presentation (2015, May)

Cross-currciculare Kompetenzen und 21st Century Skills in internationalen Large-Scale Assessments: Neues von PISA 2012 und PISA 2015

Presentation (2015, May)

An isogeometric boundary element method for fracture modeling

Presentation (2015, May)

Human rights and business at crossroads

Presentation (2015, May)

Battle Shocks in Early Life and Health/Wealth Accumulation: Theory and a Quasi-Natural Experiment in China

Presentation (2015, May)

Kelsen et Luhmann sur la justice

Presentation (2015, May)

Critique systémique de la démocratie

Presentation (2015, May)

Economic Analysis of the International Environmental Law Disputes

Presentation (2015, May)

Illegal youth organisations in East Upper Silesia 1947-1956

Presentation (2015, April 30)

Corporate Governance in Europe : Recent Evolutions

Presentation (2015, April 22)

Reduced order methods

Presentation (2015, April 16)

Genus 3 curves and explicit realisations of symplectic groups as Galois groups over Q

Presentation (2015, April 06)

Abstract: Let n be a natural number and l a prime number. Given a genus n curve C defined over Q, the group of l-torsion points defined over an algebraic closure of Q of its Jacobian variety J_C is ... [more ▼]

Abstract: Let n be a natural number and l a prime number. Given a genus n curve C defined over Q, the group of l-torsion points defined over an algebraic closure of Q of its Jacobian variety J_C is endowed with an action of the absolute Galois group G_Q , giving rise to a Galois representation ρ: G_Q → GSp(2n, l). When ρ is surjective, it provides us with a realisation of GSp(2n, l) as a Galois group over Q. To study Galois realisations (over Q) with particular ramification properties at l, it is of great interest to have conditions at auxiliary primes different from l that ensure surjectivity, while allowing great flexibility in the behaviour at the prime l. In this talk we focus on the case n = 3, and provide an explicit construction of curves C defined over Q such that ρ is surjective for a prefixed prime l. This is joint work with Cécile Armana, Valentijn Karemaker, Marusia Rebolledo, Lara Thomas and Núria Vila, and was initiated as a working group in the Conference Women in Numbers Europe (CIRM, 2013). [less ▲]

Biological Tissue Cutting Mechanics and Dynamics

Presentation (2015, April 02)

Brownian stress relaxation in sheared nanocomposites: Non-monotonic concentration dependency of relaxation frequencies

Presentation (2015, April)

Gender differences in complex problem solving. Females outperform males in knowledge acquisition, males outperform females in knowledge application.

Presentation (2015, April)

Number-space associations depend on inhibitory control in atypical young adults with attention-deficit/hyperactivity disorder

Presentation (2015, April)

Crystallization and Percolation Revisited

Presentation (2015, April)

Human Rights And Business: Searching For International Standards For Corporate Conduct In Domestic Case Law

Presentation (2015, April)

Digital Humanities: Teaching and Research

Presentation (2015, March 27)

Abortion in the Third Reich: Ideology and the Penal System Concerning Women in the Penal Institution in Saarbrücken, Germany

Presentation (2015, March 21)

With the help of almost 200 dossiers of the Penal Institution in Saarbrücken (Germany) from the period from 1928 to 1944, I examine the situation of imprisoned German women during the Nazi Regime. I am ... [more ▼]

With the help of almost 200 dossiers of the Penal Institution in Saarbrücken (Germany) from the period from 1928 to 1944, I examine the situation of imprisoned German women during the Nazi Regime. I am focusing on the cases of illegal abortions by examining individual cases as well as common ideological and legal conceptions. The dossiers helped me to make conclusions about the gap between ideological ideas concerning the German woman and the complex and dark reality of life conditions for women. Insufficient medical and sexual education along with a legal inferiority shaped the „abortion epidemics“ among lower class women. Secondary and primary sources show that along with the gradual descent of the whole legal system into a system of institutionalized crime, economic conditions also influenced the catastrophic conditions for the pregnant lower class woman. The complexity of the cases is striking: Along with the lack of understanding for the female body, economic misery, legal problems and war, many other factors appear during the research. Pressure from the own family, social norms and Christian morals played a role. Furthermore, men were an essential part of this history as husbands, fathers or rapists. Moreover, abortions developed into a business, as groups of men and women started to help other undergo abortion for money. I also explain the most common procedure of abortion and its risks. [less ▲]

Wohnt jedem Anfang wohl ein Zauber inne? Aufhängung der Erzählung und Anknüpfung des Erzählfadens am Anfang des Romans. Eine Fallstudie für das 13. Jahrhundert.

Presentation (2015, March 12)

Working both ends of the trajectory: texts, stamps, bureaucracy and unpacking the black box of migration from Africa to Europe

Presentation (2015, March)

Slow dynamics in sheared DGEBA/SiO2 suspensions

Presentation (2015, March)

Multi-Layered Spaces for Unequal Positioning in ECEC Systems

Presentation (2015, March)

« A socio-history of the institutionalization of a field of knowledge : following the elderly through 19th, 20th and 21st centuries updates of the Dewey Decimal Classification »

Presentation (2015, February 13)