PhD defense of Sarkis Moussa – 30 June 2023

30 June 2023

Date: Friday, June 30, 2023. 2pm Place: thesis room (salle des thèses) at the Hannah Arendt campus. For those unable to attend, here is the BBB link for the video conference: https://v-au.univ-avignon.fr/live/bbb-soutenance-de-these-sarkis-moussa-30-juin-2023/ Title: Architecture and Protocols for Public Safety Users in the 5G Cellular Networks Abstract: Public Safety Networks (PSNs) are wireless communication systems designed to meet the needs of emergency responders, including firefighters, police, and many other Public Safety (PS) agencies. These networks are used to prevent or respond to incidents that pose a threat to people or property. Traditionally, these PSNs were supported by reliable, but low-rate radio technologies that provide limited services such as voice communication among Public Safety Users (PSUs). Consequently, their capability to take advantage of recent developments in wireless networks and broadband applications was restricted. At the forefront of wireless communication technologies, 5th Generation (5G) and beyond Cellular Networks (CNs), are ideal for this purpose due to their advanced infrastructure and tailored techniques developed for broadband services. Their capacity for high data transmission, low latency in data exchange, and ability to support a significant number of connected devices make them perfectly suited to overcome the limitations associated with PSNs. Integrating PSNs into 5G can Plus d'infos

Cornet Seminar – Éric Bourreau – 23/06/2023

23 June 2023

In the context of team Cornet’s seminars, Éric Bourreau (LIRMM) will present his research work on Quantum Computers, a New Information Technology Revolution?, on June 23, 2023, at 11:35 in the meeting room. Abstract: The concept of quantum computing dates back to the late 1980s, and the first quantum algorithms were born in the 1990s. However, the novelty of recent years is the construction of actual quantum machines that are beginning to validate the theory. This seminar will attempt to explain how the definition of QuBits (quantum bits) gives rise to a new paradigm of computation. We will try to understand what computational power is now being offered and at what point quantum optimization could become competitive with ‘classical’ optimization methods.

Cornet Seminar – Paolo Zappala – 09/06/2023

9 June 2023

In the context of team Cornet’s seminars, Paolo Zappala (LIA/Orange) will present his research work on Extensive-form games with perfect information, on June 6, 2023, at 11:35 in the meeting room.

FOPPA – Open Database of French Public Procurement Award Notices

1 May 2023

The FOPPA database (French Open Public Procurement Award notices) is a database constituted in the framework of the ANR DeCoMaP project (ANR-19-CE38-0004). It contains public procurement notices published in France from 2010 to 2020. It relies on a subset of the TED database (Tenders Electronic Daily, an appendix of the EU official bulletin). These data have a number of issues, the most serious being that the unique ID of most involved agents are missing. We performed a number of operations to solve these issues and obtain a usable database. These operations and their outcomes are described in detail in the below technical report. Production date: 2019–2024 Publicly available database: 10.5281/zenodo.7433154  Source code used to build the base: https://github.com/CompNet/FoppaInit/  Technical report explaining the processing: Lucas Potin, Vincent Labatut, Rosa Figueiredo, Christine Largeron, Pierre-Henri Morand. FOPPA: A database of French Open Public Procurement Award notices. Technical Report, Avignon Université. 2022. ⟨hal-03796734⟩ Data paper describing the database (cite this paper if you use these data): Lucas Potin, Vincent Labatut, Pierre-Henri Morand, Christine Largeron. FOPPA: an open database of French public procurement award notices from 2010–2020. Scientific Data 10:303 (2023). DOI: 10.1038/s41597-023-02213-z ⟨hal-04101350⟩

Cornet Seminar – Shane Mannion – 05/04/2023

5 April 2023

In the context of team Cornet’s seminars, Shane Mannion (University of Limerick) will present his research work on Correlations on complex networks and their degree distributions, on April 5, 2023, at 11:35 in the meeting room. Abstract: First we look at long range correlations in complex networks. The assortativity of a network, that is, the correlation between properties of neighboring nodes can have important practical implications. For example, a targeted vaccination program will be less effective in an assortative social network (where high-degree people mix with others of high degree). We are concerned with whether these correlations between nodes extend to nodes that are separated by more than a single edge. In this talk I will discuss how the correlation between properties of connected nodes in a social network changes as the distances between those nodes increases. This lead us to research on fitting degree distributions, where we introduce a method for fitting to the degree distributions of complex network datasets, such that the most appropriate distribution from a set of candidate distributions is chosen while maximizing the portion of the distribution to which the model is fit. Current methods for fitting to degree distributions in the literature are inconsistent Plus d'infos

Cornet Seminar – Rachid Elazouzi – 31/03/2023

31 March 2023

In the context of team Cornet’s seminars, Rachid Elazouzi (LIA) will present his research work on Controlled Matching Game for Resource Allocation and User Association in WLANs, on March 31, 2023, at 11:35 in the meeting room. Abstract: In multi-rate IEEE 802.11 WLANs, the traditional user association based on the strongest received signal and the well known anomaly of the MAC protocol can lead to overloaded Access Points (APs), and poor or heterogeneous performance. Our goal is to propose an alternative game-theoretic approach for association. We model the joint resource allocation and user association as a matching game with complementarities and peer effects consisting of selfish players solely interested in their individual throughputs. Using recent game-theoretic results we first show that various resource sharing protocols actually fall in the scope of the set of stability-inducing resource allocation schemes. The game makes an extensive use of the Nash bargaining and some of its related properties that allow to control the incentives of the players. We show that the proposed mechanism can greatly improve the efficiency of 802.11 with heterogeneous nodes and reduce the negative impact of peer effects such as its MAC anomaly. The mechanism can be implemented as a virtual Plus d'infos

Cornet Seminar – Mandar Datar – 10/03/2023

10 March 2023

In the context of team Cornet’s seminars, Mandar Datar (LIA) will present her research work on Online algorithms in games and convex optimization, on March 10, 2023, at 11:35 in the meeting room.

Cornet Seminar – Panagiotis Andrianesis – 24/02/2023

24 February 2023

In the context of team Cornet’s seminars, Panagiotis Andrianesis (Boston University) will present his research work on Optimal Distributed Energy Resource Coordination: A Hierarchical Decomposition Method Based on Distribution Locational Marginal Costs, on February 23, 2023, at 11:35 in the meeting room. Abstract: In this work, we consider the day-ahead operational planning problem of a radial distribution network hosting Distributed Energy Resources (DERs) including rooftop solar and storage-like loads, such as electric vehicles. We present a novel hierarchical decomposition method that is based on a centralized AC Optimal Power Flow (AC OPF) problem interacting iteratively with self-dispatching DER problems adapting to real and reactive power Distribution Locational Marginal Costs. We illustrate the applicability and tractability of the proposed method on an actual distribution feeder, while modeling the full complexity of spatiotemporal DER capabilities and preferences, and accounting for instances of non-exact AC OPF convex relaxations. We show that the proposed method achieves optimal Grid-DER coordination, by successively improving feasible AC OPF solutions, and discovers spatiotemporally varying marginal costs in distribution networks that are key to optimal DER scheduling by modeling losses, ampacity and voltage congestion, and, most importantly, dynamic asset degradation.

Cornet Seminar – Sébastien De Valeriola – 10/02/2023

10 February 2023

In the context of team Cornet’s seminars, Sébastien De Valeriola (Free University of Brussels) will present his research work on “Fading Footprints in the Sand”: Analysis of Historical Networks and Robustness of Centrality Metrics, on February 10, 2023, at 11:35 in the room S6. Abstract: In this presentation, we consider centrality measures in their use in the analysis of historical networks. Since the sources used by historians to construct such networks are inherently incomplete and imperfect, it is necessary to take into account the robustness of these metrics as much as possible, i.e., their stability in the face of the vagaries that time has subjected historical documents to. To study this, we apply a battery of tests to three networks constructed from medieval history data. The first is a network of political history, representing the connections among the key figures in the conflict for the episcopal seat of Cambrai in the 11th century. The second is a network of socio-economic history, describing credit relationships among merchants in Ypres in the 13th century. The third is a hagiographical network depicting the connections between the lives of saints often compiled together in manuscripts. These tests are designed to simulate the processes of Plus d'infos

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