QoS-Constrained Sum-Harvested Energy Maximization in OFDMA-based Wireless Cooperative Networks

Scientific Conference (2018, December)

We investigate the performances of the time-switching (TS) and power-splitting (PS) based energy harvesting models in a two-hop relay assisted network where the end-users are capable of decoding ... [more ▼]

We investigate the performances of the time-switching (TS) and power-splitting (PS) based energy harvesting models in a two-hop relay assisted network where the end-users are capable of decoding information and harvesting energy concurrently. In particular, we consider joint resource allocation and relay selection to realize Simultaneous Wireless Transmission of Information and Energy (Wi-TIE) in a multi-carrier multi-user cooperative system where the relays employ the amplify-and-forward (AF) protocol. First, we formulate based on the TS and PS Wi-TIE architectures an optimization problem to maximize the sum of energy harvested at the end-users, taking into consideration each user's quality-of-service (QoS) requirement as well as power constraints at the transmit and relaying nodes. We then solve the formulated problem to optimize the users' Wi-TIE splitting factors along with relay-user coupling, sub-carrier-user assignment, sub-carrier pairing, and power allocation. Finally, we demonstrate the benefits of the proposed framework via numerical results. [less ▲]

QTI Standard: The Challenge of Designing Usable and Compliant Interfaces

Scientific Conference (2014, September 22)

Qu'est-ce qu'un Luxembourgeois? Histoire de la nationalité luxembourgeoise du Code Napoléon à nos jours: une histoire sous influence française, belge et allemande

in Reuter, Antoinette; Ruiz, Jean-Philippe (Eds.) Retour de Babel. Itinéraires, mémoires et citoyenneté (2007)

Qu'est-ce qu'une archive du Web?

Book published by OpenEdition Press (2019)

Bien que le Web ait seulement trente ans, son patrimoine est déjà pléthorique : la fondation Internet Archive a collecté plus de 345 milliards de pages web depuis 1996. Cette fondation, qui fut l’un des ... [more ▼]

Bien que le Web ait seulement trente ans, son patrimoine est déjà pléthorique : la fondation Internet Archive a collecté plus de 345 milliards de pages web depuis 1996. Cette fondation, qui fut l’un des pionniers de l’archivage du Web, n’est pas seule à préserver et collecter aujourd’hui ce patrimoine dit « nativement numérique ». Au cours des années 2000, plusieurs pays ont en effet lancé de tels archivages, souvent confiés aux bibliothèques nationales, et cette tendance ne cesse de s’affirmer depuis. Ces initiatives introduisent des ruptures : dans la notion même d’archive, mais aussi dans les pratiques des professionnels des bibliothèques et du patrimoine, tout comme dans celles des chercheurs. Cet ouvrage se propose d’initier le lecteur aux enjeux humains et techniques de l’archivage de la Toile, de la collecte à l’analyse en passant par la création et le partage de corpus ou encore le cadre législatif. Il étudie de manière pragmatique cet archivage, en essayant de rendre palpable à la fois sa fabrique (technique, institutionnelle, juridique), la relation que ses acteurs entretiennent avec les publics et les évolutions qu’ont connues les collectes en une vingtaine d’années. Ce livre s’intéresse également à la manière dont les archives du Web, outre leur rôle patrimonial, peuvent aujourd’hui être exploitées par différents acteurs, notamment à des fins de recherche. [less ▲]

Qu’est-ce que la justice ?

in Le Portique (2013)

Qu'est-ce que, en droit, une exception?

in Fatin-Rouge Stefanini; Vidal-Naquet, Ariane (Eds.) La norme et ses exceptions. Quels défis pour la règle de droit ? (2014)

Quack Corporate Governance III? The Capital Requirements Directive IV´s Rules on Board Compensation

in Theoretical Inquiries in Law (2015), 16

Quadcopter see and avoid using a fuzzy controller

in Uncertainty modeling in knowlege engineering and decision making : proceedings of the 10th International FLINS Conference (2012)

Unmanned Aerial Vehicles (UAVs) industry is a fast growing sector. Nowadays, the market offers numerous possibilities for off-the-shelf UAVs such as quadrotors or fixed-wings. Until UAVs demonstrate ... [more ▼]

Unmanned Aerial Vehicles (UAVs) industry is a fast growing sector. Nowadays, the market offers numerous possibilities for off-the-shelf UAVs such as quadrotors or fixed-wings. Until UAVs demonstrate advance capabilities such as autonomous collision avoidance they will be segregated and restricted to flight in controlled environments. This work presents a visual fuzzy servoing system for obstacle avoidance using UAVs. To accomplish this task we used the visual information from the front camera. Images are processed off-board and the result send to the Fuzzy Logic controller which then send commands to modify the orientation of the aircraft. Results from flight test are presented with a commercial off-the-shelf platform. [less ▲]

Quadratic Surface Lyapunov Functions in the Analysis of Feedback Systems with Double Integrators and Saturations

in Proceedings of the 10th IEEE Mediterranean Conference on Control and Automation (2002)

Many systems like servo systems, satellites, harddisks, and CD players, can be modeled as linear systems with a single integrator and a saturation. Many times, such systems are controlled with a PI ... [more ▼]

Many systems like servo systems, satellites, harddisks, and CD players, can be modeled as linear systems with a single integrator and a saturation. Many times, such systems are controlled with a PI controller resulting in a feedback interconnection with a double integrator and a saturation. In this paper, we propose a loop transformation that results in bounded operators so that classical analysis tools like mu􀀀-analysis or IQCs can be applied. In order to show boundedness of all operators, we use quadratic surface Lyapunov functions to efficiently check if a double integrator in feedback with a saturation nonlinearity has L2 􀀀-gain less than gamma > 0 􀀀. We show that for many of such systems, the L2 􀀀-gain is non-conservative in the sense that this is approximately equal to the lower bound obtained by replacing the saturation with a constant gain of . [less ▲]

Quaestio juris, quaestio facti

in Kant-Lexikon (2015)