Communication Networks for Wearable Robots

Brunetti, F.; Pons, José L; Vanhala, Jukka; Ruiz, A. F.; Martí, José V.; Marı́n, R.; Fernández, Juan Carlos Fernández; Núñez, Manuela; Rajadell, Olga; Nomdedeu, L.; Sales, Jorge Henrique; Agustí, Pau; Fabregat, Antonio; Pobil, Ángel P. del

doi:10.1002/9780470987667.ch7

Cited by 4 publications

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“…Hypothesis 3 in Theorem 2.1 could appear as a strong requirement about the continuity properties enjoyed by the background state ω. We would like to stress that the continuity condition (2.11) is satisfied by the massless vacuum on a Minkowski background [BM11] (see also the appendix). Furthermore, on a curved spacetime it is possible to construct states that have similar properties [DPP10].…”

Section: Commentsmentioning

confidence: 99%

“…In this appendix we would like to show that the continuity condition (2.11), given in hypothesis 3 of Theorem 2.1, holds for the Minkowski massless vacuum ω. These computations are inspired by work in progress of R. Brunetti and V. Moretti [BM11], which is our pleasure to thank for discussing with us their results. We reproduce them here for the convenience of the reader.…”

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confidence: 98%

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On Quantum Spacetime and the horizon problem

Doplicher¹,

Morsella²,

Pinamonti³

2013

Journal of Geometry and Physics

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In the special case of a spherically symmetric solution of Einstein equations coupled to a scalar massless field, we examine the consequences on the exact solution imposed by a semiclassical treatment of gravitational interaction when the scalar field is quantized. In agreement with Doplicher et al. (1995) [2], imposing the principle of gravitational stability against localization of events, we find that the region where an event is localized, or where initial conditions can be assigned, has a minimal extension, of the order of the Planck length. This conclusion, though limited to the case of spherical symmetry, is more general than that of [2] since it does not require the use of the notion of energy through the Heisenberg Principle, nor of any approximation as the linearized Einstein equations. We shall then describe the influence of this minimal length scale in a cosmological model, namely a simple universe filled with radiation, which is effectively described by a conformally coupled scalar field in a conformal KMS state. Solving the backreaction, a power law inflation scenario appears close to the initial singularity. Furthermore, the initial singularity becomes light like and thus the standard horizon problem is avoided in this simple model. This indication goes in the same direction as those drawn at a heuristic level from a full use of the principle of gravitational stability against localization of events, which point to a background dependence of the effective Planck length, through which a-causal effects may be transmitted. (C) 2013 Elsevier B.V. All rights reserved

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Section: Commentsmentioning

confidence: 99%

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confidence: 98%

On Quantum Spacetime and the horizon problem

Doplicher¹,

Morsella²,

Pinamonti³

2013

Journal of Geometry and Physics

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“…Put in a broader context, the information about non-thermal phenomena inside and outside galaxy clusters can complement the information derived from the hot, X-ray-emitting gas. Turbulence, in particular, is of utmost importance because of the apparent link to the acceleration mechanisms of cosmic rays (CRs) and to the cluster diffuse radio emission (Ferrari et al 2008;Brunetti 2009;Brunetti et al 2009;Cassano 2009;Cassano et al 2010). Turbulent velocity fluctuations are also considered to be important for amplifying magnetic fields in the intracluster medium (ICM) (Subramanian, Shukurov & Haugen 2006) and in the IGM (Ryu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Turbulence production and turbulent pressure support in the intergalactic medium

Iapichino

Schmidt

Niemeyer

et al. 2011

Monthly Notices of the Royal Astronomical Society

113

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The injection and evolution of turbulence in the intergalactic medium is studied by means of mesh‐based hydrodynamical simulations, including a subgrid‐scale (SGS) model for small‐scale unresolved turbulence. The simulations show that the production of turbulence has a different redshift dependence in the intracluster medium (ICM) and the warm‐hot intergalactic medium (WHIM). We show that the turbulence in the ICM is produced chiefly by merger‐induced shear flows, whereas the production in the WHIM is dominated by shock interactions. Secondly, the effect of dynamical pressure support on the gravitational contraction has been studied. This turbulent support is stronger in the WHIM gas at baryon overdensities 1 ≲δ≲ 100 and less relevant for the ICM. Although the relative mass fraction of the gas with large vorticity is considerable (52 per cent in the ICM), we find that for only about 10 per cent in mass this is dynamically relevant, namely not associated with an equally large thermal pressure support. According to this result, a significant non‐thermal pressure support counteracting the gravitational contraction is a localized characteristic in the cosmic flow, rather than a widespread feature.

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“…Seamless integration of wearable robots in ambient intelligence spaces appears as one of the major challenges for ubiquitous environments. Future trends will try to incorporate these robots in an overall network architecture for control and monitoring purposes [9]. Our vision is that a wearable robot can be seen as a smart object interoperating with other smart objects disseminated in the environment and on the wearer, providing a physical assistive service.…”

Section: Wearable Robots: Integration In Ambient Intelligence Spacesmentioning

confidence: 99%

“…Future trends will try to incorporate wearable robots in an overall network architecture for a continuous monitoring and health management system. On one side, these smart devices serve for live monitoring and control purposes; on the other side, they will be interconnected with the environment through high-level network platforms accessed by others (administrators, physicians) [9]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Lower-Limb Movement Assistance through Wearable Robots: State of the Art and Challenges

2012

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Recent technological advances made necessary the use of robots in various types of applications. Unlike traditional robot-like scenarios dedicated to industrial applications with repetitive tasks, the current focus of attention is on applications that require close human interactions. One of the main fields of such applications concerns assisting and rehabilitating of dependent/elderly persons. In this study, the state-of-the-art of the main research advances in lower-limbs human assistance is presented. This includes a review on research covering mainly lower-limb actuated exoskeletons. Some case studies related to full-limb exoskeletons are presented as well. Lower-limb movement restoration using functional electrical stimulation and treadmillbased rehabilitation devices is also investigated. In addition, the seamless integration of wearable robots in ambient intelligence spaces appears as one of the major challenges for ubiquitous environments and ambient assisted living. Some open issues related to this integration are discussed in this paper.

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Communication Networks for Wearable Robots

Cited by 4 publications

References 0 publications

On Quantum Spacetime and the horizon problem

On Quantum Spacetime and the horizon problem

Turbulence production and turbulent pressure support in the intergalactic medium

Lower-Limb Movement Assistance through Wearable Robots: State of the Art and Challenges

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