Search results for " Operator"

Nambu-Poisson manifolds and associated n-ary Lie algebroids

2001

We introduce an n-ary Lie algebroid canonically associated with a Nambu-Poisson manifold. We also prove that every Nambu-Poisson bracket defined on functions is induced by some differential operator on the exterior algebra, and characterize such operators. Some physical examples are presented.

Linear dynamics induced by odometers

2022

Weighted shifts are an important concrete class of operators in linear dynamics. In particular, they are an essential tool in distinguishing variety dynamical properties. Recently, a systematic study of dynamical properties of composition operators on $L^p$ spaces has been initiated. This class of operators includes weighted shifts and also allows flexibility in construction of other concrete examples. In this article, we study one such concrete class of operators, namely composition operators induced by measures on odometers. In particular, we study measures on odometers which induce mixing and transitive linear operators on $L^p$ spaces.

Fast Decentralized Linear Functions via Successive Graph Shift Operators

2019

Decentralized signal processing performs learning tasks on data distributed over a multi-node network which can be represented by a graph. Implementing linear transformations emerges as a key task in a number of applications of decentralized signal processing. Recently, some decentralized methods have been proposed to accomplish that task by leveraging the notion of graph shift operator, which captures the local structure of the graph. However, existing approaches have some drawbacks such as considering special instances of linear transformations, or reducing the family of transformations by assuming that a shift matrix is given such that a subset of its eigenvectors spans the subspace of i…

Estimates for the Differences of Positive Linear Operators

2018

Continuity of the radon transform and its inverse on Euclidean space

1983

'I giovani adulti presi in carico dagli USSM siciliani. I risultati di una ricerca empirica'

2013

Surgical site infection after gastrointestinal surgery in high-income, middle-income, and low-income countries: a prospective, international, multice…

2018

Background Surgical site infection (SSI) is one of the most common infections associated with health care, but its importance as a global health priority is not fully understood. We quantified the burden of SSI after gastrointestinal surgery in countries in all parts of the world. Methods This international, prospective, multicentre cohort study included consecutive patients undergoing elective or emergency gastrointestinal resection within 2-week time periods at any health-care facility in any country. Countries with participating centres were stratified into high-income, middle-income, and low-income groups according to the UN's Human Development Index (HDI). Data variables from the Globa…

Improving operating room efficiency: an observational and multidimensional approach in the San Camillo-Forlanini Hospital, Rome

2017

SCOPO.Le sale operatorie (SOs) sono strutture organizzative caratterizzate da un elevato grado di comples- sità organizzativa e gestionale che pone un attento monitoraggio dei processi produttivi, in una logica “spendingreview”. Pertanto diviene necessario pianificare interventi di miglioramento ove questi siano applicabili. È in questo contesto che è stata realizzata questa indagine, al fine di migliorare l’efficienza del servizio reso a parità di costi METODI. E’ stato realizzato una analisi organizzativa tra i mesi di Aprile e Dicembre 2016 su un blocco operatorio dell’azienda ospedaliera, applicando la metodologia “process management” alla realtà delle SOs. Il progetto ha coinvolto due …

Some approximation properties of ( p , q ) $(p,q)$ -Bernstein operators

2016

This paper is concerned with the $(p,q)$ -analog of Bernstein operators. It is proved that, when the function is convex, the $(p,q)$ -Bernstein operators are monotonic decreasing, as in the classical case. Also, some numerical examples based on Maple algorithms that verify these properties are considered. A global approximation theorem by means of the Ditzian-Totik modulus of smoothness and a Voronovskaja type theorem are proved.

Ekspertu novērtējumu agregācija, balstoties uz ekvivalences attiecību

2016

Darbs ir veltīts vispārinātā agregācijas operatora speciālai konstrukcijai, kas balstīts uz nestriktu ekvivalences attiecību. Darba mērķis ir aprakstīt kā var agregēt ekspertu novērtējumus gadījumā, kad starp novērtētiem objektiem pastāv līdzība, kas uzdota ar nestriktu ekvivalences attiecību. Piedāvātā metode ir ilustrētā ar ekonomiska rakstura piemēru.