396 research outputs found
Management of plastic bronchitis with nebulized tissue plasminogen activator: another brick in the wall.
No full textPlastic bronchitis is a rare complication of a variety of respiratory diseases and congenital heart disease surgery, particularly Fontan procedure. Bronchial casts with rubber-like consistency develop acutely and may cause severe life-threatening respiratory distress. The management of plastic bronchitis is yet not well defined. Early intermittent, self-administered nebulization of tissue plasminogen activator was found to be effective in preventing deterioration of acute respiratory symptoms in a patient with primary ciliary dyskinesia and recurrent cast formation. Further investigation into new therapeutic strategies for this devastating disease is advocated. © 2014 Colaneri et al.; licensee BioMed Central Ltd
Dictionnaire international des écrivains du monde latin. Supplément et index.
No full text"Index du Dictionnaire par matières, compilé par M. Giustino Colaneri" : p. [185]-251.[With his Dictionnaire ... Rome, 1905]Mode of access: Internet
Everolimus-induced near-resolution of giant cardiac rhabdomyomas and large renal angiomyolipoma in a newborn with tuberous sclerosis complex
No full textWe report a case of a newborn, affected by tuberous sclerosis complex, with a prenatally diagnosed giant cardiac rhabdomyoma associated with a large renal angiomyolipoma presenting as a duct-depending lesion not treatable by surgery. After receiving everolimus, a mammalian target of rapamycin inhibitor, we observed a rapid, significant, and durable reduction of both lesions without remarkable side effects
The value of knowing the market price of risk
No full textWe study an optimal allocation problem in a financial market with one risk-free and one risky asset, when the market is driven by a stochastic market price of risk. The problem is set in continuous time, for an investor with a constant relative risk aversion utility, under two scenarios: when the market price of risk is observable (the full information case), and when it is not (the partial information case). The corresponding market models are complete in the partial information case and incomplete under full information. We study how the access to more accurate information on the market price of risk affects the optimal strategies and we determine the maximum price that the investor would be willing to pay to receive such information. In particular, we examine two cases of additional information, when an exact observation of the market price of risk is available either at time 0 only (the initial information case), or during the whole investment period (the dynamic information case)
Co-positive lyapunov functions for the stabilization of positive switched systems
No full textIn this paper, exponential stabilizability of continuous-time positive switched systems is investigated. For two-dimensional systems, exponential stabilizability by means of a switching control law can be achieved if and only if there exists a Hurwitz convex combination of the (Metzler) system matrices. In the higher dimensional case, it is shown by means of an example that the existence of a Hurwitz convex combination is only sufficient for exponential stabilizability, and that such a combination can be found if and only if there exists a smooth, positively homogeneous and co-positive control Lyapunov function for the system. In the general case, exponential stabilizability ensures the existence of a concave, positively homogeneous and co-positive control Lyapunov function, but this is not always smooth. The results obtained in the first part of the paper are exploited to characterize exponential stabilizability of positive switched systems with delays, and to provide a description of all the switched equilibrium points of an affine positive switched system. © 1963-2012 IEEE
A stabilizable switched linear system does not necessarily admit a smooth homogeneous Lyapunov function
No full textThe contribution of this paper is twofold. Firstly, an example of a (positive) linear switched system that can be stabilized, via a controlled switching signal, but does not admit a smooth and positively homogeneous control Lyapunov function, is provided. The spectral properties of the subsystem matrices and of the Lyapunov candidates of the convex differential inclusion associated with the switched system, are thoroughly investigated. Secondly, by taking inspiration from the example, new feedback stabilization techniques for stabilizable positive switched systems are provided. © 2013 IEEE
Is stabilization of switched positive linear systems equivalent to the existence of an Hurwitz convex combination of the system matrices?
No full textAbstract|In this paper exponential stabilizability
of continuous-time positive switched systems is in-
vestigated. It is proved that, when dealing with two-
dimensional systems, exponential stabilizability can
be achieved if and only if there exists an Hurwitz
convex combination of the (Metzler) system matrices.
However, for systems of higher dimension this is not
true.
In general, exponential stabilizability corresponds
to the existence of a (positively homogeneous, concave
and co{positive) control Lyapunov function, but this
function is not necessarily smooth. The existence of
an Hurwitz convex combination is equivalent to the
stronger condition that the system is not only expo-
nentially stable, but it also admits a smooth control
Lyapunov function. These two conditions, in turn, are
equivalent to the fact that the stabilizing switching
law can always be based on a linear co{positive control
Lyapunov function. Finally, the characterization of
exponential stabilizability is exploited to provide a
description of all the \switched equilibrium points"
of a positive ane switched system
"From singular to non-singular filtering for periodic systems: filling the gap with the spectral interactor matrix
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