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Université de Fribourg

CPG graphs : Some Structural and Hardness Results

Champseix, Nicolas ; Galby, Esther ; Munaro, Andrea ; Ries, Bernard

In: Discrete Applied Mathematics, 2021, vol. 290, p. 17-35

In this paper we continue the systematic study of Contact graphs of Paths on a Grid (CPG graphs) initiated in Deniz et al. (2018). A CPG graph is a graph for which there exists a collection of pairwise interiorly disjoint paths on a grid in one-to-one correspondence with its vertex set such that two vertices are adjacent if and only if the corresponding paths touch at a grid-point. If every...

Università della Svizzera italiana

Vitamin D status among male late adolescents living in southern Switzerland : role of body composition and lifestyle

Rabufetti, Andrea ; Milani, Gregorio P. ; Lava, Sebastiano A. G. ; Edefonti, Valeria ; Bianchetti, Mario G. ; Stettbacher, Andreas ; Muggli, Franco ; Simonetti, Giacomo

In: Nutrients, 2019, vol. 11, no. 11, p. 2727

Background: Poor vitamin D status is a worldwide health problem. Yet, knowledge about vitamin D status among adolescents in Southern Europe is limited. This study investigated concentrations and modulating factors of vitamin D in a healthy population of male late adolescents living in Southern Switzerland. Methods: All apparently healthy subjects attending for the medical evaluation before the...

Università della Svizzera italiana

Conceptualizing the "corporate nervous net" : decentralized strategic communication based on a digital reporting indicator framework

Knebel, Sebastian ; Seele, Peter

In: International journal of strategic communication, 2019, vol. 13, no. 5, p. 23 p

The digital revolution challenges strategic communication. Artificial Intelligence (AI), Big Data, and the Internet of Things (IoT) create a rapidly changing environment for organizations as well as system complexities. To fulfill its task in ensuring the long-lasting success of organizations strategic communication needs to continuously adopt to this revolution. This article approaches the...

Università della Svizzera italiana

Statistical solutions for regressions-type models with big spatial data

Ghiringhelli, Chiara ; Mira, Antonietta (Dir.) ; Arbia, Giuseppe (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2020 ; 2020ECO011.

These last decades have witnessed an explosion of data collection and diffusion in all fields of human society. In many scientific fields researchers are becoming aware of a big data problem and of the need to manage it properly, combining the tools offered by statistics, computer, data science and informatics. This is particularly true for geo-located data, which can be collected in a...

Haute école de gestion de Genève

Multi-generational teams : the appropriate leadership style to achieve positive team dynamics : Which leadership style should leaders of multi-generational teams adopt to achieve positive team dynamics in medium-sized to big multinationals located in Geneva ?

Chikono, Charlene ; Walden, Dana (Dir.)

Mémoire de bachelor : Haute école de gestion de Genève, 2020 ; TDIBM 73.

Over the course of many decades, the level of importance attributed to generational dif-ferences has considerably increased. In recent years, the topic of generations has been the focus of numerous academic papers, books, articles, and blogs. Companies are faced with the pressure of how they acknowledge such age differences in the makeup of the workforce as part of the Diversity and Inclusion...

Université de Fribourg

Characterizations of cographs as intersection graphs of paths on a grid

Cohen, Elad ; Golumbic, Martin Charles ; Ries, Bernard

In: Discrete Applied Mathematics, 2014, vol. 178, p. 46-57

A cograph is a graph which does not contain any induced path on four vertices. In this paper, we characterize those cographs that are intersection graphs of paths on a grid in the following two cases: (i) the paths on the grid all have at most one bend and the intersections concern edges (→ B1-EPG); (ii) the paths on the grid are not bended and the intersections concern vertices (→...

Université de Fribourg

Some properties of edge intersection graphs of single-bend paths on a grid

Asinowski, Andrei ; Ries, Bernard

In: Discrete Mathematics, 2012, vol. 312, no. 2, p. 427-440

In this paper we consider graphs G whose vertices can be represented as single-bend paths (i.e., paths with at most one turn) on a rectangular grid, such that two vertices are adjacent in G if and only if the corresponding paths share at least one edge of the grid. These graphs, called B1-EPG graphs, were first introduced in Golumbic et al. (2009) [13]. Here we show that the neighborhood of every...

Université de Fribourg

Auditors and fiscal policy: Empirical evidence on a little big institution

Schelker, Mark ; Eichenberger, Reiner

In: Journal of Comparative Economics, 2010, vol. 38, no. 4, p. 357-380

Various political institutions designed to control the government have been analyzed in the academic literature. However, an important institution has been neglected so far: independent auditing institutions with an extended mandate to audit the budget draft and individual policy proposals. We argue that such auditors improve transparency and provide essential information on the impact of policy...

Université de Fribourg

Notes on the cheek region of the Late Jurassic theropod dinosaur Allosaurus

Evers, Serjoscha W. ; Foth, Christian ; Rauhut, Oliver W.M.

In: PeerJ, 2020, vol. 8, p. e8493

Allosaurus, from the Late Jurassic of North America and Europe, is a model taxon for Jurassic basal tetanuran theropod dinosaurs. It has achieved an almost iconic status due to its early discovery in the late, 19th century, and due to the abundance of material from the Morrison Formation of the western U.S.A., making Allosaurus one of the best-known theropod taxa. Despite this, various...