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Analysis of load behavior in demand response (DR) schemes is important to evaluate the performance of participants. Very few real-world experiments have been carried out and quantification and characterization of the response is a difficult task. Nevertheless it will be a necessary tool for portfolio management of consumers in a DR framework. In this paper we develop methods to quantify and characterize...
The Ultra Wide-Band (UWB) technology is now emerging. But the difficulty to design antennas having all the UWB features still restrains its deployment. Indeed, in the case of wireless multimedia communication systems, the antennas have to: be compact, low cost, easy to fabricate and integrate; they also have to be matched from 3.1 to 10.6 GHz, and to transmit very short pulses without distorting them...
Congestion management can delay grid reinforcements needed due to the growth of distributed technologies like photovoltaics and electric vehicles. This paper presents a method of congestion management for low voltage feeders using indirect control from the smart grid demonstration EcoGrid EU, where five minute electricity pricing is sent to demand. A method for forecasting demand and generating prices...
This papers explores the perceptual characteristics associated with the application of active noise cancelation (ANC) technologies to headphones. In this popular application, both noise cancelation performance is evaluated in noise & also the impact on the perception of music reproduction in noise. Environmental scenarios were reproduced from B-format recording over a 5-channel loudspeaker setup...
In many practical robotics problems, knowledge of the team configuration and capabilities is crucial in coordination of multiple heterogeneous robots. In a challenging environment with costly, sporadic, or absent communication, inferencing based on observed spatio-temporal state transitions is necessary for learning and reasoning. In this paper, we present a general purpose inference engine that takes...
In the area of autonomous multi-robot cooperation, much emphasis has been placed on how to coordinate individual robot behaviors in order to achieve an optimal solution to task completion as a team. This paper presents an approach to cooperative multi-robot reinforcement learning based on a hybrid state space representation of the environment to achieve both task learning and heterogeneous role emergence...
We report on the development of a liquid-xenon time-projection chamber, designed to validate a new medical imaging concept named ??3?? imaging??. The advantages of detection gamma-induced scintillation light with a gaseous photomultiplier (GPM) operating in cryogenic mode are discussed; first results are presented.
We derive conditions for which a circular formation of nonholonomic robots under potential function control is stable, where robots assume a radially-directed pose at equilibrium. In addition to the delay-free case, we investigate the stability of the equilibrium when communication and local processing introduce delay. It is shown that while sufficiently large processing delay always leads to instability,...
A decoupled Kalman Filter for GPS-INS sensor fusion is developed for a high-speed multi-robot system with computational resource constraints. An eighth-order filter describing system and bias dynamics is decoupled into four second-order filters. Process and measurement noise statistics and first-order bias dynamics are derived from experimental data. The decoupled filter reduces computation time by...
A compact representation of UWB antennas is given by the poles/residues modeling, both in frequency and time domain. This simple procedure is achieved by measuring a UWB link (using two identical antennas). However the measure has to be done adequately to obtain a good accuracy. In particular the SNR has to be greater than 30 dB over the whole band. It implies to use several techniques to improve...
Research activities on antenna miniaturisation are particularly important to meet systems' requirements in terms of compact, integrated antennas including broadband antennas for high data rate communications. IETR has been involved with such a topic for several years. As far as compact and broadband antennas are concerned, one has to deal with specific characterisation issues. Among different factors,...
A UWB stripline slot antenna is presented in frequency and in time domain. This structure is studied with and without filtering of the 5-6 GHz band. Experiments are carried out to investigate its return loss, its radiation behavior, and its time domain response. The antenna offers a 125% impedance bandwidth. Moreover its 108% radiation bandwidth covers the UWB band with a linear radiated far field...
Two UWB antennas have been presented and compared. Classical parameters, as the impedance matching or the maximum level of gain in E-plane and H-plane, have been used. But in order to characterize their transient behaviour, special 2D-view of radiation patterns and phase have been produced. In addition, the transmitted pulse shape is analysed in several directions and compared with the pulse exciting...
Microstrip antennas are attractive for various applications: easy to fabricate and integrate, compact, well-known and controlled. Even so, they are inescapably narrow band, which remains a definite drawback for numerous systems emerging, for example in communication and sensor areas. Nowadays, the need of broadband antennas is constantly growing. That is why many solutions are studied to increase...
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