Thierry Val

Institut de Recherche en Informatique de Toulouse · Réseaux - Mobiles - Embarqués - Sans fil - Satellites (RMESS)

The Blockchain is a common data record system that keeps permanent information about all transactions involving two parts. Blockchain consistently and dependably establishes the fictitious possession of each transaction that occurs. Once a transaction has been cryptographically verified and accepted by other participants, it is recorded as a “block...

A wireless data collection network (DCN) is the key constituent of the IoT. It is used in many applications such as transport, logistics, security and monitoring. Despite the continuous development of DCN, communication between nodes in such network presents several challenges. The major issue is the deployment of connected objects and, more precis...

The ability to localise a smart device is very useful to visually or cognitively impaired people. Localisation-capable technologies are becoming more readily available as off-the-shelf components. In this paper, we highlight the need for such a service in the field of health and autonomy, especially for disabled people. We introduce a model for Sem...

The existing multi-objective optimizers are not so efficient in resolving optimization problems with large number of objectives. For instance, we can mention the multi-objective Grey Wolf Optimizer (MOGWO) used to resolve many engineering problems. Despite its importance, the MOGWO performance is lower, compared to that of other recently-developed...

Recently, the IoT has gained great importance, which results in the evolution of communication technologies to meet the needs of different IoT applications. In addition, several domains integrate the IoT technologies in several applications of our professional life and daily activities. However, the IoT still presents many challenges and issues. Th...

IoT data collection networks have recently become one of the important research areas due to their fundamental role and wide application in many domains. The establishment of networks of objects is based essentially on the deployment of connected objects to process the collected data and transmit them to the various locations. Subsequently, a large...

IoT data collection networks have recently become one of the important research areas due to their fundamental role and wide application in many domains. The establishment of networks of objects is based essentially on the deployment of connected objects to process the collected data and transmit them to the various locations. Subsequently, a large...

—Bluetooth Low Energy (BLE) has revealed for decades manyinteresting opportunities especially in the field of positioning that made of it one of the most used technologies in indoor localization solutions. The system we propose is a combination of BLE, Acoustic and LiFi technologies. Our approachis not just arithmetic but using real time computed m...

LocURa4IoT (Localisation and UWB-Based Ranging testbed for the Internet of Things) is a testbed dedicated to the evaluation of ranging and synchronisation protocols in wireless networks. The platform is also equipped to support the study of indoor localisation using the Time of Flight of radio signals to evaluate the distance between nodes. Althoug...

Due to the exponential increase in the number of IoT connected objects, limited resource constraints and dynamic topology in IoT networks, routing of these connected nodes on the wireless networks faces several challenges and issues that need to be addressed. IoT routing protocols must be able to efficiently transmit data while meeting certain perf...

Several radio frequency direction finding algorithms exist for Internet of Things (IoT) applications that use angle-of-arrival (AoA) measurements to estimate target position. However, providing reliable and accurate direction system capability still remains a challenge. In this paper, we are interested in measuring the angle-of-arrival (AoA) of LoR...

GDR RSD, Journées LPWAN, Clermont-Ferrand

The purpose of this book is to review the recent advances in E-health technologies and applications. In particular, the book investigates the recent advancements in physical design of medical devices, signal processing and emergent wireless technologies for E-health. In a second part, novel security and privacy solutions for IoT-based E-health appl...

IoT data collection networks, formerly known as wireless sensor networks, have become one of the most active areas of research in the field of information technology. The deployment of connected objects represents a fundamental phase on the establishment of IoT collection networks. The IoT deployment problem consists in positioning all the sensors...

Wireless nodes localization has become a major research theme in recent years. Distributed and collaborative solutions are particularly interesting since the nodes can compute their own localisation without depending on external computational resources. In this paper, we present the context of distributed and cooperative localisation and the princi...

As the elderly demographic grows larger, the need for efficient healthcare becomes pressing. One solution is to introduce Artificial Intelligence in the healthcare domain, which implies relevant dataset exploitation. In this paper, we address the issue of imbalance prediction using open-access sensor-based datasets recorded on both young adults and...

Localisation is a major topic in the Wireless Sensor Networks and the Internet Of Things. This Work-in-Progress paper introduces ALO, an Ad-hoc Localisation Object proposed to help in designing in-stack localisation services, i.e. a service that enables the computation of mobile node positions, relying only on information from the protocol stack su...

When resolving many-objective problems, multi-objective optimization algorithms encounter several difficulties degrading their performances. These difficulties may concern the exponential execution time, the effectiveness of the mutation and recombination operators or finding the tradeoff between diversity and convergence. In this paper, the issue...

Wireless Sensor Networks (WSN) is an evolving field of research with various applications. Deploying sensors is a decisive operation that greatly influences the performance and the functioning of the network. Comparing the 2D deployment with the 3D one, the latter is more complex because of its ability to attend more constraints imposed by real pro...

Housing under a shared housing organisation enables frail elderly persons to live in a semi autonomous way, thanks to cooperation between residents and an assistant. The social organization of this new type of housing also has an impact on the social participation of users. This article is based on a pilot study and deals with the benefits of digit...

Due to the cost-effective advantage, range-free localization schemes are attractive for low-cost Internet of Things applications. As a distinguishing range-free scheme, DV-Hop localization can localize those unknown nodes which have less than 3 or even no neighbor anchors. However, the localization results by existing DV-Hop based algorithm are fou...

With the rapid surge of M‐Health and smart city systems, the need to accommodate sensors and actuators to achieve effective automation turns out to be imposed, for an efficient machine‐to‐machine communication to be maintained. In this regard, the key elements necessary for a successful M‐Health system to take place are discovered to be the power c...

Low-power wide area networks (LPWANs) has recently emerged as a popular long-range and low-speed radio communication technology as a result of the important growth of the Internet of Things (IoT) market. In fact, LoRa, Sigfox and NB-IoT are the three major LPWAN technologies which compete for IoT deployment. In this manuscript, we analyze and compa...

Energy presents a crucial subject of study for researchers and specialists. Our work is interested in the technology of IEEE 802.15.4. Indeed, the latter proves to display a num- ber of noticeable specificities and characteristics qualifying it, displaying two different operating modes, namely the Beacon enabled mode and the non-Beacon enabled one....

Afin d'assurer le suivi des patients atteints de l'arthrose du genou, il est indispensable de les équiper d'un dispositif connecté. Ce dispositif peut être utilisé pour les accompagner à faire leurs exercices à la maison correctement, de les diriger et permettre à un tiers (médecin ou kiné) le suivi à distance. Le prototype initial de la genouillèr...

3D Deployment plays a fundamental role in setting up efficient wireless sensor networks (WSNs) and IoT networks. In general, WSN are widely utilized in a set of real contexts such as monitoring smart houses and forest fires with parachuted sensors. This study focus on planned 3D deployment in which the sensor nodes must be accurately positioned at...

Durant la dernière décennie, les personnes âgées vivant seules sont de plus en plus nombreuses. Ainsi, afin de leur assurer une assistance à domicile continue, la notion de "maison intelligente" est apparue. Notre travail consiste à combiner trois technologies (Bluetooth Low Energy, audio et LiFi) afin de proposer un système hybride de localisation...

Due to the rising number of aged people in the last decades, many apprehensions about their quality of life and their personal security in their own homes came to surface especially when these persons prefer to live alone. Compared to other age groups, old persons are more susceptive to domestic incidents, such as sudden illnesses and falls. Theref...

3D Deployment represents a fundamental role in setting up an efficient wireless sensor network (WSNs) and IoT network. In general, WSN are widely used in a variety of applications ranging from monitoring a smart house to monitoring forest fires with parachuted sensors. In this paper, we focus on planned 3D deployment, which the sensor nodes must be...

Avec la croissance rapide du marché de l'Internet des objets (IoT), les réseaux étendus de faible puissance (LPWAN) sont devenus une des technologies populaires pour les communications radio à longue portée et à faible débit. Plusieurs réseaux LPWAN actuels utilisent des technologies concurrentes pour le déploiement de l'IoT. Cet article propose un...

Indoor positioning is a growing demand for many uses: orientation in subways, shopping promotions, Internet of Things (IoT). These radio systems need dedicated wireless infrastructure deployment in order to provide users orientation information. In this paper, we present an emergency hybrid localization system which could help policemen or firefigh...

Wireless Sensor Network (WSN) based on IEEE 802.15.4 technology continues to gain considerable importance. The present work is based on this standard and a cluster tree network topology. This network is divided into many subgroups each of which is charac- terized by its special IEEE parameters (Beacon Order (BO) and Superframe Order (SO)). A mathem...

Autism spectrum disorders (ASD) are characterized by difficulties of socialization, disorders of verbal communication, restricted and stereotyped patterns of behaviors. Firstly, the paper reports tools of the user-centered design (UCD) used as well participants involved in the design of interactive collaborative system for children with ASD. Then,...

Bluetooth Low Energy (BLE) has revealed for decades manyinteresting opportunities especially in the field of positioning that made of it one of the most used technologies in indoor localization solutions. The system we propose is a combination of BLE, Acoustic and LiFi technologies. Our approachis not just arithmetic but using real time computed me...

Les habitats partagés permettent à des personnes âgées fragiles de vivre de façon semi-autonome grâce à une coopération entre résidents encadrée par une accompagnatrice. Ce papier pose la question de l’apport des technologies numériques et de l’intelligence ambiante pour répondre à des besoins propres à ce nouveau mode de vie. La réalisation de cet...

The 3D indoor deployment of sensor nodes is a complex real world problem, proven to be NP-hard and difficult to resolve using classical methods. In this context, we propose a hybrid approach relying on a novel bird's accent-based many objective particle swarm optimization algorithm (named acMaPSO) to resolve the problem of 3D indoor deployment on t...

Compared with the two-dimensional deployment, the three-dimensional deployment of sensor networks is more challenging. We studied the problem of 3D repositioning of sensor nodes in wireless sensor networks. We aim essentially to add a set of nodes to the initial architecture. The positions of the added nodes are determined by the proposed algorithm...

Compared with ...

Le département Réseaux et Télécommunications (RT) de l’IUT de Blagnac est impliqué dans le montage et l’animation d’une formation à distance sur les objets connectés. Cette formation de type e-learning est composée de MOOC (Massive Open Online Course) puis de SPOC (Small Private Online Courses), incluant des activités pédagogiques en présentiel pou...

présentation des travaux de recherche liés au projet CANet depuis 10 ans

As many applications of the Internet of Things assume the knowledge of mobile object position, localisation has become a hot topic in the academic research community as well as for industrial R&D departments. Although distance measurements (ranging) and localisation can be studied though simulations, using real nodes provides more accurate and real...

In order to deploy the various solutions for the Device Layer of the Internet of Things, these proposals must be evaluated in terms of performance, scalability and repeatability. This chapter introduces our test platform that was designed to support these types of tests. We describe the wireless nodes that make up the test platform and present a se...

The Internet of Things and particularly energy constraint object revealed these last years some radio frequencies technologies which allow to realize wireless transmissions at long range and with low energy. This change of paradigm makes tip over the problems of multi-hop networks to multi-channel MAC networks. The LoRa™ technology arises from this...

The Internet of Things and particularly energy constraint object revealed these last years some radio frequencies technologies which allow to realize wireless transmissions at long range and with low energy. This change of paradigm makes tip over the problems of multi-hop networks to multi-channel MAC networks. The Open image in new window technolo...

In the healthcare domain, Wireless Body Area Network (WBAN) has emerged as a vital technology that is capable of providing better methods to diagnose various hazardous diseases. The CANet projet is a project that proposes alternative monitoring solutions. This paper studies the possibility of transmitting different types of information through an I...

The 3D indoor redeployment of connected objects in IoT collection networks is a complex problem that influences the overall performance of the network. In this paper, we aim to resolve this problem using a real prototyping system based on a real-world deployment. The aim is to choose the best positions to add a set of connected objects while optimi...

Ambient Assisted Living (AAL) represents one of the most promising Internet of Things applications due to its influence on the quality of life and health of the elderly people. However, the interoper- ability is one of the major issues that needs to be addressed to promote the adoption of AAL solutions in real environments, and to find a way of com...

Among typical range-free localization schemes for sensor networks, DV-Hop has its distinguishing advantage of the capability to localize unknown nodes which have less than 3 or even no neighbor anchors. However, existing DV-Hop based localization methods have not considered the problem of packet collisions, which can frequently happen during the th...

Ambient Assisted Living (AAL) represents one of the most promising Internet of Things applications due to its influence on the quality of life and health of the elderly people. However, the interoperability is one of the major issues that needs to be addressed to promote the adoption of AAL solutions in real environments, and to find a way of commo...