390 research outputs found
El Tlacuache Núm. 624 (2014). 624 Año 13 (2014) junio. El Tlacuache
No full textLa Empatía: Fundamentos teóricos, medición, estimulación, y su percepción social por Marte E. Roel Lesur. - El cóndor del sur y el águila de norte en resistencia por Georgina Galván Medina
Minimum Scan Cover and Variants - Theory and Experiments
Full text linkWe consider a spectrum of geometric optimization problems motivated by contexts such as satellite communication and astrophysics. In the problem Minimum Scan Cover with Angular Costs, we are given a graph G that is embedded in Euclidean space. The edges of G need to be scanned, i.e., probed from both of their vertices. In order to scan their edge, two vertices need to face each other; changing the heading of a vertex incurs some cost in terms of energy or rotation time that is proportional to the corresponding rotation angle. Our goal is to compute schedules that minimize the following objective functions: (i) in Minimum Makespan Scan Cover (MSC-MS), this is the time until all edges are scanned; (ii) in Minimum Total Energy Scan Cover (MSC-TE), the sum of all rotation angles; (iii) in Minimum Bottleneck Energy Scan Cover (MSC-BE), the maximum total rotation angle at one vertex.
Previous theoretical work on MSC-MS revealed a close connection to graph coloring and the cut cover problem, leading to hardness and approximability results. In this paper, we present polynomial-time algorithms for 1D instances of MSC-TE and MSC-BE, but NP-hardness proofs for bipartite 2D instances. For bipartite graphs in 2D, we also give 2-approximation algorithms for both MSC-TE and MSC-BE. Most importantly, we provide a comprehensive study of practical methods for all three problems. We compare three different mixed-integer programming and two constraint programming approaches, and show how to compute provably optimal solutions for geometric instances with up to 300 edges. Additionally, we compare the performance of different meta-heuristics for even larger instances
Metal-Metal Cooperativity in Well-defined Dinuclear Complexes; Understanding the Reactivity of Dicopper and Dicobalt Complexes Using the PNNP Expanded Pincer Ligand
No full textThis datapackage contains one PDF file containing the supporting information for the experimental chapters of the PhD thesis: "Metal-Metal Cooperativity in Well-defined Dinuclear Complexes; Understanding the Reactivity of Dicopper and Dicobalt Complexes Using the PNNP Expanded Pincer Ligand"
Author: Roel L. M. Bienenmann
Co-promotor: Daniël L. J. Broere
Promotor: Robertus J. M. Klein Gebbink
For each experimental chapter there is a seperate folder containing the files which contain the spectroscopic and computational data corresponding to these chapters. Some of these overlap with the datapackages from the papers on which the chapters are based. These datapackages of publications are mentioned below in the meta-data
Eredoctoraat prof. mr. Geert Corstens
No full textOn October 17, 2023, during the 100th Dies Natalis of Radboud University, Geert Corstens received an honorary doctorate from Radboud University. This honorary doctorate was awarded to him because of his tireless efforts for a strong, fair and equal constitutional state. This edition includes the laudation of honorary supervisor Roel Schutgens, the acceptance speech of Geert Corstens and the Van der Grint lecture given by Geert Corstens during the week of the Dies Natalis.
Geert Corstens was president of the Supreme Court of the Netherlands from 2008 to 2014. Immediately after his appointment, he was known for his assertive attitude towards the political apparatus. The independence of the constitutional state should not be threatened by the wishes and needs of politicians and other outsiders, Corstens believed. He has also made a formidable contribution to public-oriented communication and explanation of the rule of law. Corstens also wrote, among other things, the books Our constitutional state and The judge seizes power: And other misconceptions about the democratic constitutional state to promote general communication about rights and democracy in the Netherlands. Corstens is also the author of the standard work Dutch criminal procedural law and was professor of criminal law at Radboud University from 1982 to 1995
Nonparametric estimation of a distribution function from doubly truncated data under dependence
No full textThe NPMLE of a distribution function from doubly truncated data was introduced in the seminal paper of Efron and Petrosian (J Am Stat Assoc 94:824-834, 1999). The consistency of the NPMLE depends however on the assumption of independent truncation. In this work we introduce an extension of the Efron-Petrosian NPMLE when the variable of interest and the truncation variables may be dependent. The proposed estimator is constructed on the basis of a copula function which represents the dependence structure between the variable of interest and the truncation variables. Two different iterative algorithms to compute the estimator in practice are introduced, and their performance is explored through an intensive Monte Carlo simulation study. We illustrate the use of the estimators on two real data examples.Work supported by the Grant MTM2017-89422-P (MINECO/AEI/FEDER, UE) and by Portuguese Funds through FCT FundacAo Ciencia e Tecnologia, within the Projects UIDB/00013/2020 and UIDP/00013/2020. Financial support from the Xunta de Galicia (Centro singular de investigacion de Galicia accreditation 2019-2022) and the EU (ERDF), Ref. ED431G2019/06, is acknowledged too. The authors would like to gratefully acknowledge the financial support from the Interuniversity Attraction Poles Programme (IAP-network P7/06) of the Belgian Science Policy Office.Moreira, C (corresponding author), Univ Minho, CMAT Ctr Math, Braga, Portugal.
[email protected]; [email protected]; [email protected]
The degree of international trade and exchange rateexposure - Firm-level evidence from two small openeconomies
No full textThis study investigates exchange rate exposure by comparing Dutch and Belgian listed firms at each point in time using monthly data from 2006 to 2015. Gaps in previous research are addressed by using disaggregated firm-level data to construct trade-weighted firm-specific effective exchange indices and by applying copula theory. Our findings are as follows. First, extreme events leading to non-normality of stock returns are, at least partially, caused by a firm's international trade status. Second, Dutch listed firms experience stronger exchange rate exposure since they engage more into trade outside the Eurozone than the Belgian listed firms. Third, listed importing firms experience stronger exchange rate exposure than listed exporting firms, which indicates a dual effect of exchange rate risk arising from cash flow effects in both the domestic economy and the foreign market. Overall, our proposed methodology contributes to a better understanding of the link between exchange rate changes and trade, and may therefore be of use to policy makers involved with exchange rate or monetary policy.The authors gratefully acknowledge the financial support of the NBB (Project No. 3H130602) and also thank the NBB for dealing with the foreign trade and national accounts database from the Central Balance Sheet Office. The views expressed in this article represent the views of the authors and not necessarily those of the National Bank of Belgium or Statistics Netherlands.
We would like to thank the participants of the internal seminar at the National Bank of Belgium on the 17th of September 2018 in Brussels and the participants of the 4th International Workshop on Financial Markets and Nonlinear Dynamics (FMND–www.fmnd.fr) from 31 May to June 1, 2019 in Paris for fruitful discussions.Annelies, V (corresponding author), Hasselt Univ, Fac Business Econ, Martelarenlaan 42, B-3500 Hasselt, Belgium.
[email protected]
A mathematical analysis of fairness in shootouts
Full text linkA shootout is a popular mechanism to identify a winner of a match between two teams. It consists of rounds in which each team gets, sequentially, an opportunity to score a point. It has been shown empirically that shooting first or shooting second in a round has an impact on the scoring probability. This raises a fairness question: is it possible to specify a sequence such that identical teams have equal chance of winning? We show that, for a sudden death, no repetitive sequence can be fair. In addition, we show that the so-called Prohuet-Thue-Morse sequence is not fair. There is, however, an algorithm that outputs a fair sequence whenever one exists. We also analyze the popular best-of- shootouts and show that no fair sequence exists in this situation. In addition, we find explicit expressions for the degree of unfairness in a best-of- shootout; this allows sports administrators to asses the effect of the length of the shootout on the degree of unfairness
How to schedule the Volleyball Nations League
Full text linkThe Volleyball Nations League is the elite annual international competition within volleyball, with the sixteen best nations per gender contesting the trophy in a tournament that spans over 6 weeks. The first five weeks contain a single round robin tournament, where matches are played in different venues across the globe. As a consequence, each team follows an intensive travel plan, where it happens quite often that there is a large discrepancy between travel burdens of opposing teams. This is considered a disadvantage for the team that travelled more. We analyse this problem, and find that it is closely related to the well-known Social Golfer Problem: we name the resulting problem the Traveling Social Golfer Problem (TSGP). We propose a decomposition approach for the TSGP, leading to the so-called Venue Assignment Problem and the Nation Assignment Problem. We prove that a solution to the Venue Assignment problem determines the amount of unfairness, and we also prove that any solution of the Venue Assignment problem can be extended to a solution to the Nation Assignment problem satisfying the so-called home-venue property. Using integer programming methods, we find, for real-life instances, the fairest schedules with respect to the difference in travel distance
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