The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

Pierre Rouchon - One of the best experts on this subject based on the ideXlab platform.

  • Stabilization of photon-number states via single-photon corrections: A Convergence analysis under imperfect measurements and feedback delays
    European Journal of Control, 2018
    Co-Authors: Hector Bessa Silveira, Paulo Sérgio Pereira Da Silva, Pierre Rouchon
    Abstract:

    This paper presents a Mathematical Convergence analysis of a Fock states feedback stabilization scheme via single-photon corrections. This measurement-based feedback has been developed and experimentally tested in 2012 by the cavity quantum electrodynamics group of the Laboratoire Kastler Brossel. Here, we consider an infinite-dimensional Markov model corresponding to a realistic experimental set-up where imperfect measurements and feedback delays are taken into account. In this realistic context, we show that any goal Fock state can be stabilized by a Lyapunov-based feedback for any initial quantum state belonging to the dense subset of finite rank density operators with support in a finite photon-number subspace. Closed-loop simulations illustrate the performance of the feedback law.

  • Stabilization of photon-number states via single-photon corrections: a first Convergence analysis under an ideal set-up
    2015 54th IEEE Conference on Decision and Control (CDC), 2015
    Co-Authors: Hector Bessa Silveira, Paulo Sérgio Pereira Da Silva, Pierre Rouchon
    Abstract:

    This paper presents a first Mathematical Convergence analysis of a Fock states feedback stabilization scheme via single-photon corrections. This measurement-based feedback has been developed and experimentally tested in 2012 by the cavity quantum electrodynamics group of Serge Haroche and Jean-Michel Raimond. Here, we consider the infinite-dimensional Markov model corresponding to the ideal set-up where detection errors and feedback delays have been disregarded. In this ideal context, we show that any goal Fock state can be stabilized by a Lyapunov-based feedback for any initial quantum state belonging to the dense subset of finite rank density operators with support in a finite photon-number sub-space. Closed-loop simulations illustrate the performance of the feedback law.

Dae-eun Kim - One of the best experts on this subject based on the ideXlab platform.

  • Task Allocation Into a Foraging Task With a Series of Subtasks in Swarm Robotic System
    IEEE Access, 2020
    Co-Authors: Won-ki Lee, Neil Vaughan, Dae-eun Kim
    Abstract:

    In swarm robotic systems, task allocation is a challenging problem aiming to decompose complex tasks into a series of subtasks. We propose a self-organizing method to allocate a swarm of robots to perform a foraging task consisting of sequentially dependent subtasks. The method regulates the proportion of robots to meet the task demands for given tasks. Our proposed method is based on the response threshold model, mapping the intensity of task demands to the probability of responding to candidate tasks depending on the response threshold. Each robot is suitable for all tasks but some robots have higher probability of taking certain tasks and lower probability of taking others. In our task allocation method, each robot updates its response threshold depending on the associated task demand as well as the number of neighbouring robots performing the task. It relies neither on a centralized mechanism nor on information exchange amongst robots. Repetitive and continuous task allocations lead to the desired task distribution at a swarm level. We also analyzed the Mathematical Convergence of the task distribution among a swarm of robots. We demonstrate that the method is effective and robust for a foraging task under various conditions on the number of robots, the number of tasks and the size of the arena. Our simulation results may support the hypothesis that social insects use a task allocation method to handle the foraging task required for a colony’s survival.

Hector Bessa Silveira - One of the best experts on this subject based on the ideXlab platform.

  • Stabilization of photon-number states via single-photon corrections: A Convergence analysis under imperfect measurements and feedback delays
    European Journal of Control, 2018
    Co-Authors: Hector Bessa Silveira, Paulo Sérgio Pereira Da Silva, Pierre Rouchon
    Abstract:

    This paper presents a Mathematical Convergence analysis of a Fock states feedback stabilization scheme via single-photon corrections. This measurement-based feedback has been developed and experimentally tested in 2012 by the cavity quantum electrodynamics group of the Laboratoire Kastler Brossel. Here, we consider an infinite-dimensional Markov model corresponding to a realistic experimental set-up where imperfect measurements and feedback delays are taken into account. In this realistic context, we show that any goal Fock state can be stabilized by a Lyapunov-based feedback for any initial quantum state belonging to the dense subset of finite rank density operators with support in a finite photon-number subspace. Closed-loop simulations illustrate the performance of the feedback law.

  • Stabilization of photon-number states via single-photon corrections: a first Convergence analysis under an ideal set-up
    2015 54th IEEE Conference on Decision and Control (CDC), 2015
    Co-Authors: Hector Bessa Silveira, Paulo Sérgio Pereira Da Silva, Pierre Rouchon
    Abstract:

    This paper presents a first Mathematical Convergence analysis of a Fock states feedback stabilization scheme via single-photon corrections. This measurement-based feedback has been developed and experimentally tested in 2012 by the cavity quantum electrodynamics group of Serge Haroche and Jean-Michel Raimond. Here, we consider the infinite-dimensional Markov model corresponding to the ideal set-up where detection errors and feedback delays have been disregarded. In this ideal context, we show that any goal Fock state can be stabilized by a Lyapunov-based feedback for any initial quantum state belonging to the dense subset of finite rank density operators with support in a finite photon-number sub-space. Closed-loop simulations illustrate the performance of the feedback law.

Won-ki Lee - One of the best experts on this subject based on the ideXlab platform.

  • Task Allocation Into a Foraging Task With a Series of Subtasks in Swarm Robotic System
    IEEE Access, 2020
    Co-Authors: Won-ki Lee, Neil Vaughan, Dae-eun Kim
    Abstract:

    In swarm robotic systems, task allocation is a challenging problem aiming to decompose complex tasks into a series of subtasks. We propose a self-organizing method to allocate a swarm of robots to perform a foraging task consisting of sequentially dependent subtasks. The method regulates the proportion of robots to meet the task demands for given tasks. Our proposed method is based on the response threshold model, mapping the intensity of task demands to the probability of responding to candidate tasks depending on the response threshold. Each robot is suitable for all tasks but some robots have higher probability of taking certain tasks and lower probability of taking others. In our task allocation method, each robot updates its response threshold depending on the associated task demand as well as the number of neighbouring robots performing the task. It relies neither on a centralized mechanism nor on information exchange amongst robots. Repetitive and continuous task allocations lead to the desired task distribution at a swarm level. We also analyzed the Mathematical Convergence of the task distribution among a swarm of robots. We demonstrate that the method is effective and robust for a foraging task under various conditions on the number of robots, the number of tasks and the size of the arena. Our simulation results may support the hypothesis that social insects use a task allocation method to handle the foraging task required for a colony’s survival.

Dennis Guster - One of the best experts on this subject based on the ideXlab platform.

  • Full dimensional computer simulations to study pulsatile blood flow in vessels, aortic arch and bifurcated veins: Investigation of blood viscosity and turbulent effects
    2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009
    Co-Authors: Renat A. Sultanov, Dennis Guster
    Abstract:

    We report computational results of blood flow through a model of the human aortic arch and a vessel of actual diameter and length. A realistic pulsatile flow is used in all simulations. Calculations for bifurcation type vessels are also carried out and presented. Different Mathematical methods for numerical solution of the fluid dynamics equations have been considered. The non-Newtonian behaviour of the human blood is investigated together with turbulence effects. A detailed time-dependent Mathematical Convergence test has been carried out. The results of computer simulations of the blood flow in vessels of three different geometries are presented: for pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and the widely used method in the literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, the wall shear stress distribution, is found in the region of the aortic arch. Turbulent effects are found to be important, particularly in the case of bifurcation vessels.

  • Computer Simulations of Pulsatile Human Blood Flow Through 3D-Models of the Human Aortic Arch, Vessels of Simple Geometry and a Bifurcated Artery: Investigation of Blood Viscosity and Turbulent Effects
    arXiv: Fluid Dynamics, 2008
    Co-Authors: Renat A. Sultanov, Dennis Guster
    Abstract:

    We report computational results of blood flow through a model of the human aortic arch and a vessel of actual diameter and length. On the top of the aortic arch the branching of the %%three arteries are included: the subclavian and jugular. A realistic pulsatile flow is used in all simulations. Calculations for bifurcation type vessels are also carried out and presented. Different Mathematical methods for numerical solution of the fluid dynamics equations have been considered. The non-Newtonian behaviour of the human blood is investigated together with turbulence effects. A detailed time-dependent Mathematical Convergence test has been carried out. The results of computer simulations of the blood flow in vessels of three different geometries are presented: for pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and the widely used method in the literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, a wall shear stress distribution, is found in the region of the aortic arch. Turbulent effects are found to be important, particularly in the case of bifurcation vessels.

  • 3D Computer Simulations of Pulsatile Human Blood Flows in Vessels and in the Aortic Arch: Investigation of Non-Newtonian Characteristics of Human Blood
    arXiv: Computational Physics, 2008
    Co-Authors: Renat A. Sultanov, Dennis Guster, Brent Engelbrekt, Richard Blankenbecler
    Abstract:

    Methods of Computational Fluid Dynamics are applied to simulate pulsatile blood flow in human vessels and in the aortic arch. The non-Newtonian behaviour of the human blood is investigated in simple vessels of actual size. A detailed time-dependent Mathematical Convergence test has been carried out. The realistic pulsatile flow is used in all simulations. Results of computer simulations of the blood flow in vessels of two different geometries are presented. For pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and widely used method in literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, wall sear stress distribution, is found in the region of the aortic arch. We consider this result as theoretical evidence that supports existing clinical observations and those models not using non-Newtonian treatment underestimate the risk of disruption to the human vascular system.

  • CSE - 3D Computer Simulations of Pulsatile Human Blood Flows in Vessels and in the Aortic Arch: Investigation of Non-Newtonian Characteristics of Human Blood
    2008 11th IEEE International Conference on Computational Science and Engineering, 2008
    Co-Authors: Renat A. Sultanov, Dennis Guster, Brent Engelbrekt, Richard Blankenbecler
    Abstract:

    Methods of Computational Fluid Dynamics are applied to simulate pulsatile blood flow in human vessels and in the aortic arch. The non-Newtonian behaviour of the human blood is investigated in simple vessels of actual size. Turbulence effects are taken into account. A detailed time-dependent Mathematical Convergence test has been carried out. The realistic pulsatile flow is used in all simulations. Results of computer simulations of the blood flow in vessels of two different geometries are presented. For pressure, strain rate and velocity component distributions we found significant disagreements between our results obtained with realistic non-Newtonian treatment of human blood and widely used method in literature: a simple Newtonian approximation. A significant increase of the strain rate and, as a result, wall sear stress distribution, is found in the region of the aortic arch. We consider this result astheoretical evidence that supports existing clinical observations and those models not using non-Newtonian treatment underestimate the risk of disruption to the human vascular system.