CITI seminar – Raul De Lacerda (CentraleSupélec) – 2/12 at 14:20

Title: L’observabilité du spectre radio et ses opportunités

Date and Place: December 2nd 14h20, salle Vitrine (CITI Lab, INSA-Lyon, Batiment Claude Chappe), 6 avenue des arts, 69621 Villeurbanne

Speaker: Dr.Raul De Lacerda (CentraleSupélec)

 

Abstract: 

Depuis l’apparition des télécommunications, des stratégies d’organisation du spectre radio a été mis en place pour permettre les différentes technologies à cohabiter/coexister. Le rôle de l’Union Internationale des Télécommunications (UIT) a évolué au long des décennies et elle a accompagné les évolutions qui ont dû se mettre en place pour répondre aux besoins du monde connecté. Malheureusement, le spectre radio est devenu une ressource rare dont la nouvelle révolution s’appuiera sur le développement de nouveaux services et des nouvelles technologies qui puissent se développer sans nécessairement remettre en question le plan de répartition des bandes de fréquence. Nous nous concentrons dans cette présentation sur les ambitions et résultats de projets que nous développons au sein du L2S. Le premier, qui s’inscrit dans le cadre d’un FUI en coordination avec Télécom Paris, Thales et ERTE Bowen, nous présentons une solution de détection des objets volants (ovnis) à partir des ondes 4G. Le deuxième, concerne l’amélioration des techniques de localisation indoor par empreinte numérique des balises wifi. Le dernier, s’inscrit dans l’ambition d’intégrer des techniques de Machine Learning pour extraire des informations sur le spectre radio.

 

 

 


CITI seminar – Alexandre Guitton (Université Clermont Auvergne) – 22/11 at 10:30

Title: Présentation de travaux passés sur les boucles de routage et la couche MAC LoRaWAN, et de projets sur LoRa

Date and Place: November 22th 10h30, Amphi Chappe (CITI Lab, INSA-Lyon, Batiment Claude Chappe), 6 avenue des arts, 69621 Villeurbanne

Speaker: Dr. Alexandre Guitton (Université Clermont Auvergne)

 

Abstract: 

Alexandre va être accueilli en délégation dans l’équipe AGORA du laboratoire CITI pour l’année 2021-2022. Dans cet exposé, il va présenter ses travaux passés les plus significatifs, et son projet de travaux pour la délégation.
1/ J’ai travaillé sur les boucles de routage qui se produisent lorsque deux protocoles de routage sont utilisés simultanément dans un réseau. Cette situation peut se produire dans plusieurs situations : si le protocole de routage est mis à jour (de manière désynchronisée), si le protocole de routage dépend de la priorité des paquets, si deux protocoles de routage sont utilisés sur deux time-slots différents, etc. Les propositions qui seront présentées permettent de garantir une transition rapide sans boucle.
2/ J’ai aussi travaillé sur la récupération de signaux LoRa qui sont en collision, en faisant l’hypothèse que leur puissance de réception est proche. Pour cela, j’utilise des informations temporelles liées à l’écart des instants de transmission entre les trames, et d’autres liées à la modulation LoRa.

 

Biography:

Alexandre Guitton est professeur en informatique à l’Isima (école interne de Clermont Auvergne INP, établissement composante de l’Université Clermont Auvergne). Il effectue sa recherche au LIMOS (UMR CNRS). Il est spécialisé dans le domaine des réseaux sans fil et de l’intérêt des objets, et travaille plus précisément sur la conception de protocoles d’accès au médium pour la surveillance (généralement environnementale) par des réseaux de capteurs sans fil. Récemment, il s’est concentré sur la technologie LoRa et cherche à trouver des algorithmes efficaces permettant de récupérer des messages qui entrent en collision.

 


CITI seminar – Valeria Loscri (Inria) – 25/11 at 14:00

Title: Software Defined Approaches for Non-Conventional Wireless Communication Paradigms

Date and Place: November 25th 14h00, room TBA (CITI Lab, INSA-Lyon, Batiment Claude Chappe), 6 avenue des arts, 69621 Villeurbanne

Speaker: Dr. Valeria Loscri (Inria)

 

Abstract: 

The increasing demand of high data rate, bandwidth, low latency in wireless communication systems, imposes the urgence to investigate on new communication paradigms.
New communication technologies should be integrated in communication systems to make them as much flexible as possible and capable to dynamically reacting to external conditions based on the status of each node. Based on these considerations, in this talk two main concepts will be discussed: 1) wireless systems based on Software Defined (SD) approaches and 2) non-conventional communication paradigms. The synergic combination of these two concepts seems to have a great potential for responding to the demand of new communication services. The non-conventional wireless communication paradigms as Visible Light Communication (VLC) and the integration of Reconfigurable Intelligent (Meta)Surface in the wireless systems, allow to extend the range of wireless systems and to meet the urgence of Sustainable ICT. The SD approach may provide a sufficient degree of flexibility and adaptivity for making the coexistence of non-conventional wireless solutions with the traditional wireless approaches very smooth.

 

Biography:

Valeria Loscri is a permanent research scientist at Inria Lille – Nord Europe since October 2013. From December 2006 to September 2013, she was research fellow in the TITAN Lab at the University of Calabria, Italy. She received her M.Sc. and Ph.D degrees in computer science in 2003 and 2007, respectively, from the University of Calabria and her HDR (Habilitation à diriger des recherches) in 2018 from the Université de Lille (France). Her prominent research interests focus on emerging technologies for new communication paradigms such as Visible Light Communication (VLC), reconfigurable Intelligent (Meta)Surfaces (RIM) based systems and cyber security in wireless communication systems. She has been involved in several European Projects (H2020 CyberSANE, FP7 EU VITAL) and national projects. She is on the editorial board of IEEE COMST, Elsevier ComNet, ComCom, JNCA, IEEE Transaction on NanoBioscience. Since 2019, she is Scientific International Delegate for Inria Lille – Nord Europe.

 


CITI seminar – Mohamed Maouche (Inria) – 17/11 at 14:00

Title: Recent Approaches of Speaker Anonymization Techniques

Date and Place: November 17th 14h00, Citi (room TBD) + visio

Speaker: Dr. Mohamed Maouche (Postdoc Inria)

 

Abstract: 

An increasing number of smart devices embed speech-commands. The usage of speech offers simplicity, accessibility and it also opens new human-computer interactions. However, the gathering and exploitation of this type of data raise many privacy threats as speech data is sensitive in nature. Personal information about the speaker can be inferred (e.g., gender, emotion…). In addition, speech is a biometric characteristic, it can be used to identify speakers. To address this issue anonymization techniques have been proposed. In this talk, we are going to present the recent approaches for speech anonymization techniques with a focus on x-vector based anonymization.

 

Biography:

Starting October 2021, I’m a post-doc in Privatics (Inria) at Lyon working on privacy in Federated Learning in the Chaire DSVD supported by Renault and Labex IMU. Previously, I was a post-doc with Magnet (Inria) at Lille for two years, working on speech privacy. Before, I have received my Ph.D. in 2019 from Insa Lyon which I did under the supervision of Sara Bouchenak and Sonia Ben Mokhtar in Liris Lab working on Location Privacy. My main interest throughout my research is the re-identification and anonymization problem, especially while facing peculiar data.

 

 


CITI seminar – Miriam Kolar (Stanford University) – 16/11 at 14:00

Title: Human Centered Archaeoacoustics

Date and Place: November 16th 14h00-16h00, Amphi Chappe (CITI Lab, INSA-Lyon, Batiment Claude Chappe), 6 avenue des arts, 69621 Villeurbanne

Speaker: Dr. Miriam Kolar (Adjunct professor at Stanford University)

 

Abstract: 

Despite over 125 years of modern room acoustics, spatial acoustics has only recently been applied in archaeological research. Likewise, musical instrument acoustics remains a growing but infrequent archaeometric approach. Auditory science is even less frequently incorporated. Since 2008, Miriam Kolar has led archaeoacoustics fieldwork and instrument performance studies at the 3,000-year-old UNESCO World Heritage Centre archaeological complex Chavín de Huántar, Perú, with a second Andean project about sound as an Inca administrative tool. In this presentation, Dr. Kolar will share case-study examples from her work in developing methodologies for “human-centered” archaeometric research, relating acoustics to human experience and social behavior in ancient contexts. Acoustical and psychoacoustical experiments in archaeological settings and with artifact sound-producing instruments enable data-driven reconstructions of heritage sites and instruments in use. Physics-based evaluations of human sensory perspectives support the ecological validity of heritage acoustics, opening a new technological frontier for cultural heritage research, preservation, and knowle.

 

Biography:

Miriam A. Kolar, M.F.A., Ph.D., is an Adjunct Professor at the Center for Computer Research in Music and Acoustics (CCRMA) at Stanford University and a Visiting Professor at Amherst College (USA). She studies human-sonic interrelationships across time and geography, applying acoustical and auditory perceptual science methodologies within an anthropological framework. Principal investigator of the integrative archaeoacoustics project at the 3,000-year-old Andean ceremonial site and UNESCO World Heritage Centre Chavín de Huántar, Peru, Dr. Kolar collaborates on novel applications of digital technologies for cultural heritage research and engagement. Her cultural acoustics research (http://culturalacoustics.org) leverages cross-disciplinary theories and tools to understand sonic experiential aspects of past and present life. In current work, and as co-organizer of the NEH-supported Digital Aural Heritage project (http://auralheritage.org), she explores the potential of auralizations for scholarship and public interfacing. Topics of interest include contextual knowledge representation, information ethics, and ecological validity.

This talk is organized in the context of the creation of the Emeraude team which is a collaboration between the Grame institute and Citi-lab at Insa-Lyon (https://team.inria.fr/emeraude/).

 


Félicitations à Razvan, reconnu « meilleur chercheur junior 2021 » du GdR RSD !

Chaque année le GdR RSD met en lumière des chercheurs. Cette année, le jury a sélectionné Razvan Stanica de l’équipe Agora du laboratoire CITI co-lauréats du prix du meilleur chercheur 2021 du GDR RSD dans la catégorie junior, aux côtés d’Alain Tchana (ENS / LIP).

En particulier, le jury a estimé que :

“Les deux candidats ont fait un travail exceptionnel, avec de nombreuses publications dans des conférences ou journaux de premier plan, une influence dans leur domaine comme en témoigne le nombre de citations de leurs travaux, une expérience établie de direction de recherche et d’animation scientifique et de fructueuses collaborations avec le monde universitaire et l’industrie.

Razvan Stanica a d’abord contribué au domaine des réseaux véhiculaires avant d’élargir ses thématiques de recherche aux stratégies de collecte de données des réseaux mobiles, à leur analyse pour caractériser les usages aussi bien que les performances et enfin aux architectures et protocoles réseaux en proposant une approche innovante de convergence du réseau d’accès et du réseau coeur. L’impact de son travail est reflété par un grand nombre de citations et par son leadership dans six projets de recherche, avec des partenaires académiques et industriels, dont un JCJC de l’ANR, qui débutera en 2021.”

Félicitations à Razvan pour l’obtention de ce prix et félicitations à l’équipe Agora pour l’environnement stimulant et aux moyens nécessaires à cet accomplissement !

 


CITI seminar – El Hourcine Bergou (INRAE) – 09/04 at 15:00

Title:  Stochastic Three Points Method For Unconstrained Smooth Minimization

Date and Place: 9th April 2021 15:00 – link

Speaker: Dr El Hourcine Bergou (INRAE)

 

Abstract: 

In this work, we consider the unconstrained minimization problem of a smooth function in a setting where only function evaluations are possible. We design a novel randomized derivative-free algorithm—the stochastic three points (STP) method—and analyze its iteration complexity. At each iteration, STP generates a random search direction according to a certain fixed probability law. Our assumptions on this law are very mild: roughly speaking, all laws which do not concentrate all measure on any halfspace passing through the origin will work. Although, our approach is designed to not explicitly use derivatives, it covers some first order methods. For instance, if the probability law is chosen to be the Dirac distribution concentrated on the sign of the gradient, then STP recovers the Signed Gradient Descent method. If the probability law is the uniform distribution on the coordinates of the gradient, then STP recovers the Randomized Coordinate Descent Method.
The complexity of STP depends on the probability law via a simple characteristic closely related to the cosine measure which is used in the analysis of deterministic direct search (DDS) methods. Unlike in DDS, where $O(n)$ ($n$ is the dimension of the problem) function evaluations must be performed in each iteration in the worst case, our method only requires two new function evaluations per iteration. Consequently, while the complexity of DDS depends quadratically on $n$, our method depends linearly on $n$.

 

Biography:

Dr l Hourcine Bergou is a research scientist at INRAE. My research interests are in all areas that intersect with optimization, including algorithms, machine learning, statistics, and operations research. I am particularly interested in algorithms for large scale optimization including randomized and distributed optimization methods.

 


CITI seminar – Michael Barros (University of Essex, UK) – 01/04 at 14:00

Title:  Molecular Communications using Astrocytes for Boolean logic gates implementation in mammalian cells

Date and Place: 1st April 2021 14:00 – link

Speaker: Dr Michael Barros (University of Essex, UK)

 

Abstract: 

In this talk we will show the use of astrocytes to realize Boolean logic gates, through manipulation of the threshold of Ca2+ ion fows between the cells based on the input signals. Through wet-lab experiments that engineer the astrocytes cells with pcDNA3.1-hGPR17 genes as well as chemical compounds, we show that both AND and OR gates can be implemented by controlling Ca2+ signals that fow through the population. A reinforced learning platform is also presented in the paper to optimize the Ca2+ activated level and time slot of input signals Tb into the gate. This design platform caters for any size and connectivity of the cell population, by taking into consideration the delay and noise produced from the signalling between the cells. To validate the efectiveness of the reinforced learning platform, a Ca2+ signalling simulator was used to simulate the signalling between the astrocyte cells. The results from the simulation show that an optimum value for both the Ca2+ activated level and time slot of input signals Tb is required to achieve up to 90% accuracy for both the AND and OR gates. Our method can be used as the basis for future Neural–Molecular Computing chips, constructed from engineered astrocyte cells, which can form the basis for a new generation of brain implants.

 

Biography:

Dr Barros is an Assistant Professor (Lecturer) since June 2020 in the School of Computer Science and Electronic Engineering at the University of Essex, UK. He is also a MSCA-IF Research Fellow (part-time) at the Tampere University, Finland. He received the PhD in Computer Science at the Waterford Institute of Technology in 2016. He previously held multiple academic positions as a Research Fellow in the Waterford Institute of Technology, Ireland.
He has over 70 research peer-reviewed scientific publications in top journals and conferences such as Nature Scientific Reports, IEEE Transactions on Communications, IEEE Transactions on Vehicular Technology, in the areas of molecular and unconventional communications, biomedical engineering, bionano science and 6G. Since 2020, he is a review editor for the Frontiers in Communications and Networks journal in the area of unconventional communications. He also served as guest editor for the IEEE Transactions on Molecular, Biological and Multi-Scale Communications and Digital Communications Networks journals. He received the CONNECT Prof. Tom Brazil Excellence in Research Award in 2020. Dr Barros was awarded also the Irish Research Council’s (IRC) Government of Ireland Post-doc Fellow from 2016-2018 and the Enterprise Ireland’s (EI) Commercialization Funding from 2018-2019.

 


CITI seminar – Somantika Datta (Univ. Idaho, USA) – 18/02 at 14:00

Title: Construction and properties of certain real multi-angle tight frames

Date and Place: 18th February 2021 14:00 – link

Speaker: Prof. Somantika Datta (Univ. Idaho, USA)

 

Abstract: 

Frames are now standard tools in signal processing, and have applications ranging from compressed sensing, to communication systems and quantum sensing. Designing frames with some special structure such as equiangularity and tightness is highly desirable in applications. However, constructing equiangular tight frames (ETFs) with a given size in a specific dimension can be difficult or impossible in some cases. This leads one to consider the construction of frames with few distinct angles among pairs of frame vectors. In the special case of d+1 vectors in a d-dimensional space, it is well known that the vertices of a regular simplex will give an ETF. Using this, we will show a specific construction which, for a given dimension d and integer 1 < k ≤ d, gives a real unit norm tight frame such that the number of distinct angles among the vectors is bounded above by k. We will present several properties of this multi-angle tight frame. We also show how one can strategically choose subsets of such a multi-angle tight frame that will be equiangular or orthogonal. This property is meaningful in the context of erasures. We will also discuss a connection between certain unit norm tight frames with three angles and adjacency matrices of regular graphs.

 

Biography:

Somantika Datta is an associate professor of mathematics at the University of Idaho. She received a Ph.D. in mathematics from the University of Maryland, College Park. This was followed by postdoctoral positions at Arizona State University and Princeton University. Her research interests lie in the area of applied harmonic analysis with focus on frame theory and applications in signal processing.

 


CITI seminar – Daryus Chandra (University of Southampton, UK) – 11/02 at 14:00

Title: Quantum Communications over Noisy Entanglement

Date and Place: 11th February 2021 14:00 – link

Speaker: Dr Daryus Chandra (University of Southampton, UK)

 

Abstract: 

Within the Quantum Internet framework, multiple quantum devices are interconnected via pre-shared maximally-entangled quantum states for enabling various applications, including the on-demand classical and quantum communication. Hence, the pre-shared entanglement, which is constituted by the EPR pair, can be viewed as the primary consumable resources within the Quantum Internet. However, the generation and the distribution of the EPR pairs are subject to quantum decoherence imposed by the quantum channels, which will manifest as quantum errors. Similar to the classical domain, the quantum errors imposed by the quantum channels can be mitigated using quantum error-correction codes. In this talk, we will explore two approaches for achieving reliable quantum communication over noisy entanglement by incorporating quantum error-correction codes. More specifically, the first approach is constituted by the consecutive steps of quantum entanglement distillation followed by quantum teleportation, while the second approach can be viewed as the direct quantum communication over noisy entanglement. We will also discuss the pros and the cons of each approach while examining their compatibilities for a broader range of applications for the Quantum Internet framework.

 

Biography:

Daryus Chandra is a research fellow at the Next-Generation Wireless Research Group, School of Electronics and Computer Science, University of Southampton, UK. He received the B.Eng. and M.Eng. degree from the Department of Electrical Engineering and Information Technology, Universitas Gadjah Mada, Indonesia, in 2013 and 2014, respectively. He obtained his PhD with the Next-Generation Wireless Research Group, School of Electronics and Computer Science, University of Southampton, UK, in 2020. He returned to Southampton in 2021 after completing a one-year postdoctoral research fellowship at Quantum Internet Research Group, University of Naples Federico II, Italy.