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In October 2019, a multidisciplinary team from the ERC HornEast project, led by Julien Loiseau, carried out a survey in Arra region (South Eastern Tigray, Ethiopia). The team was composed of Julien Loiseau (historian, Aix-Marseille University, director of the ERC HornEast project), Simon Dorso (archaeologist, Lyon-2 University, CIHAM), Bertrand Hirsch (historian, University Paris-1 Panthéon Sorbonne), Amélie Chekroun (historian, CNRS, IREMAM), Deresse Ayenachew (historian, Debre Berhan University, ERC HornEast), Hiluf Berhe, professor of archeology at Mekelle University. Also part of the team were Bruk Jifara, expert from the ARCCH (Addis Ababa) and Guesh Tsehaye, archaeologist, expert from the Cultural and Tourism Office of Tigray (Mekelle). During several days the team was accompanied by Nicolas Baker (CNRS Image), who produced a short documentary on the filed work. The data was processed and uploaded by Maryasha Barbé (Archivist, ERC HornEast, IREMAM) in 2022. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 726206).; Sheikh Nur Husayn Muhammad guides the team on the Habera plateau.; Le cheikh Nur Husayn Muhammad guide l’équipe sur le plateau d’Habera.

In December 2019, a multidisciplinary team from the ERC HornEast project, led by Julien Loiseau, carried out an archaeological excavation in Kwiḥa (South Eastern Tigray, Ethiopia). The team was composed of Julien Loiseau (historian, Aix-Marseille University, director of the ERC HornEast project), Simon Dorso (archaeologist, Lyon-2 University, CIHAM), Elise Mercier (archaeologist, Poitiers University, HERMA), Hiluf Berhe, professor of archeology at Mekelle University, David Ollivier (topographer and archaeologist , CNRS, LA3M), Bertrand Hirsch (historian, University Paris-1 Panthéon Sorbonne), Amélie Chekroun (historian, CNRS, IREMAM), Jean-François Breton (archaeologist, CNRS, ArScAn), Deresse Ayenachew (historian, Debre Berhan University, ERC HornEast), Robert Kool (archaeologist, Israel Antiquities Authority), Desta HaileYesus (archaeologist, Mekelle University). Also part of the team were Dawit Tibebu, expert from the ARCCH (Addis Ababa) and Guesh Tsehaye, archaeologist, expert from the Cultural and Tourism Office of Tigray (Mekelle), Goitom Admasu, expert from the Cultural and Tourism Office of Mekelle City. Students from the master's degree in archeology at Mekelle University actively participated in the excavations. The data was processed and uploaded by Maryasha Barbé (Archivist, ERC HornEast, IREMAM) in 2022. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 726206).; Diagnostic trenches to establish the hold of the medieval Muslim cemetery.; Tranchés diagnostiques en vue d’établir l’emprise du cimetière musulman médiéval.

In October 2019, a multidisciplinary team from the ERC HornEast project, led by Julien Loiseau, carried out a survey in Arra region (South Eastern Tigray, Ethiopia). The team was composed of Julien Loiseau (historian, Aix-Marseille University, director of the ERC HornEast project), Simon Dorso (archaeologist, Lyon-2 University, CIHAM), Bertrand Hirsch (historian, University Paris-1 Panthéon Sorbonne), Amélie Chekroun (historian, CNRS, IREMAM), Deresse Ayenachew (historian, Debre Berhan University, ERC HornEast), Hiluf Berhe, professor of archeology at Mekelle University. Also part of the team were Bruk Jifara, expert from the ARCCH (Addis Ababa) and Guesh Tsehaye, archaeologist, expert from the Cultural and Tourism Office of Tigray (Mekelle). During several days the team was accompanied by Nicolas Baker (CNRS Image), who produced a short documentary on the filed work. The data was processed and uploaded by Maryasha Barbé (Archivist, ERC HornEast, IREMAM) in 2022. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 726206).; Drone view of the site. Large circular surface marker surrounded by several smaller circular markers.; Vue par drone du site. Grand marqueur de surface circulaire entouré de plusieurs marqueurs circulaires plus petits.

In December 2019, a multidisciplinary team from the ERC HornEast project, led by Julien Loiseau, carried out an archaeological excavation in Kwiḥa (South Eastern Tigray, Ethiopia). The team was composed of Julien Loiseau (historian, Aix-Marseille University, director of the ERC HornEast project), Simon Dorso (archaeologist, Lyon-2 University, CIHAM), Elise Mercier (archaeologist, Poitiers University, HERMA), Hiluf Berhe, professor of archeology at Mekelle University, David Ollivier (topographer and archaeologist , CNRS, LA3M), Bertrand Hirsch (historian, University Paris-1 Panthéon Sorbonne), Amélie Chekroun (historian, CNRS, IREMAM), Jean-François Breton (archaeologist, CNRS, ArScAn), Deresse Ayenachew (historian, Debre Berhan University, ERC HornEast), Robert Kool (archaeologist, Israel Antiquities Authority), Desta HaileYesus (archaeologist, Mekelle University). Also part of the team were Dawit Tibebu, expert from the ARCCH (Addis Ababa) and Guesh Tsehaye, archaeologist, expert from the Cultural and Tourism Office of Tigray (Mekelle), Goitom Admasu, expert from the Cultural and Tourism Office of Mekelle City. Students from the master's degree in archeology at Mekelle University actively participated in the excavations. The data was processed and uploaded by Maryasha Barbé (Archivist, ERC HornEast, IREMAM) in 2022. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 726206).; Muhammad Ali Kahsay, serving mosques in the village of Arra, inspects graves in the cemetery of Sheikh Marjan, near the village of As-Segeda.; Muhammad Ali Kahsay, desservant des mosquées du village d’Arra, inspecte les tombes du cimetière de Cheikh Marjan, près du village d’As-Segeda.

ETP4HPC White Paper; International audience; We foresee an increasing need for integrated software ecosystems which combine current “island” solutions and bridge the gaps between them. These ecosystems must facilitate the full life cycle of Computing Continuum (CC) use cases, including initial modelling, programming, deployment, execution, optimization, as well as monitoring and control. It will be important to ensure adequate reproducibility of workflow results and to find ways for creating and managing trust when sharing systems, software and data. All of these will in turn require novel or improved hardware capabilities. This white paper provides an initial discussion of the gaps. Our objective is to accelerate progress in both hardware and software infrastructures to build CC use cases, with the ultimate goals of accelerating scientific discovery, improving timeliness, quality and sustainability of engineering artifacts, and supporting decisions in complex and potentially urgent situations.

Ce billet porte sur un incunable conservé à la Bibliothèque municipale de Lille.

Hardy, Andrew, Melody Shum and Vũ Ngọc Quyên. “The ‘F-System’ of Targeted Isolation: A Key Method In Vietnam’s Suppression of Covid-19”. CRISEA European Policy Brief, December 2020. http://crisea.eu/wp-content/uploads/2020/12/PB3-VN-containment-method-05.pdf

We present a decomposition of the Koopman operator based on the sparse structure of the underlying dynamical system, allowing one to consider the system as a family of subsystems interconnected by a graph. Using the intrinsic properties of the Koopman operator, we show that eigenfunctions for the subsystems induce eigenfunctions for the whole system. The use of principal eigenfunctions allows to reverse this result. Similarly for the adjoint operator, the Perron-Frobenius operator, invariant measures for the dynamical system induce invariant measures of the subsystems, while constructing invariant measures from invariant measures of the subsystems is less straightforward. We address this question and show that under necessary compatibility assumptions such an invariant measure exists. Based on these results we demonstrate that the a-priori knowledge of a decomposition of a dynamical system allows for a reduction of the computational cost for data driven approaches on the example of the dynamic mode decomposition.; We present a decomposition of the Koopman operator based on the sparse structure of the underlying dynamical system, allowing one to consider the system as a family of subsystems interconnected by a graph. Using the intrinsic properties of the Koopman operator, we show that eigenfunctions for the subsystems induce eigenfunctions for the whole system. The use of principal eigenfunctions allows to reverse this result. Similarly for the adjoint operator, the Perron-Frobenius operator, invariant measures for the dynamical system induce invariant measures of the subsystems, while constructing invariant measures from invariant measures of the subsystems is less straightforward. We address this question and show that under necessary compatibility assumptions such an invariant measure exists. Based on these results we demonstrate that the a-priori knowledge of a decomposition of a dynamical system allows for a reduction of the computational cost for data driven approaches on the example of the dynamic mode decomposition.

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