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See detailThe discrete Pompeiu problem on the plane
Kiss, Gergely UL

Presentation (2018, November 27)

The discrete Pompeiu problem is stemmed from an integral-geometric question on the plane. The problem is whether we can reconstruct a function if we know the average values of the function on every ... [more ▼]

The discrete Pompeiu problem is stemmed from an integral-geometric question on the plane. The problem is whether we can reconstruct a function if we know the average values of the function on every congruent copy of a given pattern. After introducing the theory of spectral analysis on discrete Abelian groups, I show some results for the discrete version of the problem. One of the arguments is connected to a coloring problem of the plane. One of them is a geometric construction and some others based on some geometric and combinatoric properties of the plane. I also mention some unsolved questions of the topic. My talk is based on a joint work with M. Laczkovich and Cs. Vincze. [less ▲]

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See detailLe rapport Werner en suspens. Les débats autour de l'Union économique et monétaire en 1973
Danescu, Elena UL

in Wilkens, Andreas (Ed.) Une année particulière: 1973 et les tourments de l'Europe (2018)

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See detailToward a Prosecutor for the European Union. Vol. 2: Draft Rules of procedure
Ligeti, Katalin UL

Book published by Hart Publishing (2018)

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See detailComparative Study of Genetic and Discrete Firefly Algorithm for Combinatorial Optimization
Tessaro Lunardi, Willian UL; Voos, Holger UL

in 33rd ACM/SIGAPP Symposium On Applied Computing, Pau, France, April 9 - 13, 2018 (2018, April)

Flexible job-shop scheduling problem (FJSP) is one of the most challenging combinatorial optimization problems. FJSP is an extension of the classical job shop scheduling problem where an operation can be ... [more ▼]

Flexible job-shop scheduling problem (FJSP) is one of the most challenging combinatorial optimization problems. FJSP is an extension of the classical job shop scheduling problem where an operation can be processed by several different machines. The FJSP contains two sub-problems, namely machine assignment problem and operation sequencing problem. In this paper, we propose and compare a discrete firefly algorithm (FA) and a genetic algorithm (GA) for the multi-objective FJSP. Three minimization objectives are considered, the maximum completion time, workload of the critical machine and total workload of all machines. Five well-known instances of FJSP have been used to evaluate the performance of the proposed algorithms. Comparisons among our methods and state-of-the-art algorithms are also provided. The experimental results demonstrate that the FA and GA have achieved improvements in terms of efficiency. Solutions obtained by both algorithms are comparable to those obtained by algorithms with local search. In addition, based on our initial experiments, results show that the proposed discrete firefly algorithm is feasible, more effective and efficient than our proposed genetic algorithm for solving multi-objective FJSP. [less ▲]

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See detailRobert Triffin, a 'personal equation'
Danescu, Elena UL

in The Journal of European Economic History (2018)

Robert Triffin (1911-1993), a Belgian-born economist who spent much of his career in America, had a major influence on 20th-century economic thinking. He is particularly known for his monetary approach ... [more ▼]

Robert Triffin (1911-1993), a Belgian-born economist who spent much of his career in America, had a major influence on 20th-century economic thinking. He is particularly known for his monetary approach. His intellectual legacy revolves ariund the 'Triffin dilemma' or 'Triffin paradox'. Triffin accurately predicted the end of the Bretton Woods system, though not for the right reasons. Triffin stuck by his monetary theory that it was much harder to achieve sound international economic management with flexible exchange rates and that best practices were by no means a guarantee of global stability if they were not accompanied by genuine international coordination. Triffin was also a committed European. He was close to Jean Monnet and Pierre Werner and worked alongside them from the early 1960's onwards in favour of European monetary integration. [less ▲]

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See detailThe Werner report and the financial crisis during the 1970s
Danescu, Elena UL; Tedeschi, Paolo

in Leboutte, René; Tedeschi, Paolo (Eds.) Euro changes: European Responses to Economics and Social Changes. From de 1970s to the new Millennium. (2018)

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See detailHarnack estimates for a nonlinear parabolic equation under Ricci flow
Li, Yi UL; Zhu, Xiaorui

in Differential Geometry & its Applications (2018), 56

In this paper, we consider the Harnack estimates for a nonlinear parabolic equation under the Ricci flow. The gradient estimates for positive solutions as well as Li-Yau type inequalities are also given.

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See detailThe Deformation Area Difference (DAD) method for condition assessment of reinforced structures
Erdenebat, Dolgion UL; Waldmann, Danièle UL; Scherbaum, Frank et al

in Engineering Structures (2018), 155

The investigation and condition assessment of bridges have a very high priority in the construction industry today. Particularly, due to the fact that many bridge structures are getting old and partly ... [more ▼]

The investigation and condition assessment of bridges have a very high priority in the construction industry today. Particularly, due to the fact that many bridge structures are getting old and partly reach the end of their useful life, the control and condition assessment of bridge structures have become very important and essential. The present research work introduces an efficient new method for condition assessment called the Deformation Area Difference (DAD) Method. This new method represents an attractive alternative to visual inspection and long-term monitoring. In this paper, the new method with its theoretical background is presented and explained by means of a laboratory experiment and some additional theoretical calculation examples. The experimental investigations have been realised on a reinforced concrete beam, which has been gradually loaded until failure. For each load step, the stiffness reduction and the apparent cracking have been monitored. High-precision measurements such as close-range photogrammetry, digital levelling and displacement sensors have been used for the determination of the deflection curve. The DAD method has been applied to identify the area of the crack pattern of the laboratory experiment. Furthermore, the method is discussed with regard to the load level and the precision of the deformation measurements. On the basis of the laboratory experiment, the applicability of the DAD method for damage detection could be proven. Furthermore, the sensitivity of the method with regard to the damage degree, the static system, the damage position and the impact of temperature variation were analysed. [less ▲]

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See detailÉvaluations numériques: quel rôle pour l’expérience utilisateur ?
Pere, Maxime UL; Lallemand, Carine UL; Koenig, Vincent UL

Scientific Conference (2018, January)

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See detailTyranny of Writing: Ideologies of the Written Word
Weth, Constanze UL; Juffermans, Kasper UL

Book published by Bloomsbury (2018)

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See detailIntroduction: The Tyranny of Writing in Language and Society
Weth, Constanze UL; Juffermans, Kasper UL

in Weth, Constanze; Juffermans, Kasper (Eds.) Tyranny of Writing: Ideologies of the Written Word (2018)

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See detail‘Cruise to the Edge’. How 1970s prog-rock dinos found a safe haven on the cruise ship
Hesse, Markus UL

in Monios, Jason; Wilmsmeier, Gordon (Eds.) Maritime Mobilities (2018)

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See detailÖffentlichkeiten als Räume ästhetischer Praxis. Zur politischen Ästhetik Hannah Arendts
Pavlik, Jennifer UL

in Büttner, Urs (Ed.) Öffentlichkeiten. Theorie und Geschichte ästhetisch-­politischer Praxen (2018)

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See detailLinks between socio-emotional skills, behaviour and cognitive development of preschool children in Serbia: A longitudinal study
Aleksic, Gabrijela UL; Merrell, Christine; Ferring, Dieter UL et al

in European Journal of Psychology of Education (2018)

Young children’s socio-emotional skills are important for understanding their own and other’s behaviours and interactions. No study in Serbia has investigated this before. In this study we explored the ... [more ▼]

Young children’s socio-emotional skills are important for understanding their own and other’s behaviours and interactions. No study in Serbia has investigated this before. In this study we explored the links between early socio-emotional skills, behaviour and cognitive development of preschool children in Serbia over time. Children (N=159) aged 5-8 were rated by the teachers on their socio-emotional skills and behaviour, and their literacy and mathematics assessed, at three-time points over 14 months. At Time 3, children’s socio-emotional skills and behaviour were associated with gender and mathematics. Mathematics was associated with children’s social skills and literacy. Literacy was associated with adjustment, gender and mathematics. At all three times, girls were rated more positively than boys. This study offers the first insight into the relationship between socio-emotional skills, behaviour and mathematics and literacy performance of preschool children in Serbia which will inform the development and evaluation of interventions. Attrition of the sample limits the findings. [less ▲]

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See detailEvaluation of a regional real-time precise positioning system based on GPS/BeiDou observations in Australia
Ding, Wenwu UL; Tan, Bingfeng; Chen, Yongchang et al

in Advances in Space Research (2018)

The performance of real-time (RT) precise positioning can be improved by utilizing observations from multiple Global Navigation Satellite Systems (GNSS) instead of one particular system. Since the end of ... [more ▼]

The performance of real-time (RT) precise positioning can be improved by utilizing observations from multiple Global Navigation Satellite Systems (GNSS) instead of one particular system. Since the end of 2012, BeiDou, independently established by China, began to provide operational services for users in the Asia-Pacific regions. In this study, an regional RT precise positioning system in Australia is developed to evaluate the performance of GPS/BeiDou observations in providing high precision positioning services for users. Fixing three hourly updated satellite orbits, RT correction messages are generated and broadcasted by processing RT observation/navigation data streams from AUSCORS at the server side. At the user side, RT PPP is realized by processing RT data streams and the RT correction messages received. RT clock offsets, for which the accuracy reached 0.07 and 0.25 ns for GPS and BeiDou, respectively, can be determined. Based on these corrections, an accuracy of 12.2, 30.0 and 45.6 cm in the North, East and Up directions was achieved for the BeiDou-only solution after 30 minutes while the GPS-only solution reached 5.1, 15.3 and 15.5 cm for the same components at the same time. A further improvement of 43.7, 36.9 and 45.0 percent in the three directions, respectively, was achieved for the combined GPS/BeiDou solution. After the initialization process, the North, East and Up positioning accuracies were 5.2, 8.1 and 17.8 cm, respectively, for the BeiDou-only solution, while 1.5, 3.0, and 4.7 cm for the GPS-only solution. However, we only noticed a 20.9% improvement in the East direction was obtained for the GPS/BeiDou solution, while no improvements in the other directions were detected. It is expected that such improvements may become bigger with the increasing accuracy of the BeiDou-only solution. [less ▲]

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See detailPhilosophy as a Kind of Scepticism
Heidemann, Dietmar UL

in Machuca, Diego (Ed.) Skepticism: From Antiquity to the Present (2018)

Detailed reference viewed: 180 (6 UL)