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Modelos de Correcci 3n de Error no Lineal entre Mercados Accionarios Latinoamericanos y el Mercado Accionario de Estados Unidos
Arturo Lorenzo Vald？？s
Revista de Análisis Económico (RAE) , 2006,
Abstract: The intention of the present work is to evaluate long-run relations in the stock markets of six Latin American countries (Argentina, Brazil, Chile, Colombia, Mexico and Peru) and the United States stock market, by means of a model in which a cointegration relation exists between the principals prices stock indexes but allowing that the movements towards the long-run equilibrium only happen in some periods. For the previous thing threshold autoregressive models are considered. The idea is that the movements towards the long-run equilibrium need not occur every period but in a specific regime. We find that the specification is better in nonlinear than linear models and the cointegration relation only appears in four of the six analyzed Latin American countries.
No linealidad en los mercados accionarios latinoamericanos
Arturo Lorenzo Valdés
Análisis Económico , 2005,
Abstract: Se evalúa la dinámica no lineal en los precios de los índices accionarios de Argentina, Brasil, Chile Colombia, México y Perú. Se utiliza un modelo de cambio de régimen (SETAR) con tres regímenes. La idea de estos tres regímenes es que existen inversionistas no informados que provocan una dinámica diferente para rendimientos grandes (positivos y negativos) y rendimientos peque os (cercanos al equilibrio). Se encuentra que los modelos no lineales son estadísticamente más adecuados y presentan medidas de desempe o de ajuste y predicción mejores para los casos analizados.
EL DERECHO COMPARADO DEL SIGLO XXI
Sixto SáNCHEZ LORENZO
Boletín mexicano de derecho comparado , 2008,
Abstract:
Cómo evaluar un paciente con miotonía
Herrera Lorenzo,Orestes Andrés;
Revista Archivo M？？dico de Camag？？ey , 2012,
Abstract: introduction: myotonia is a muscle disorder, characterized by a delayed relaxation of a skeletal muscle after a voluntary contraction or by percussion. development: the physiopathology in the light of current knowledge regarding genetic defects associated with channelopathies is presented. positive and differential diagnosis, classification, main clinical forms and treatment are discussed. conclusions: despite a growing understanding of the genetic basis of these disorders, clinical features and the electro-diagnostic remain as insuperable allies in positive and differential diagnosis. on myotonia no dystrophica there are some answers, with many more questions both its medical examination and its classification and treatment.
Se acude menos a consulta en un entorno de crisis económica? Do people go to the doctor less in times of economic crisis?
J. J. Mira,S. Lorenzo
Anales del Sistema Sanitario de Navarra , 2011,
Abstract:
Comment on "Two Dimensional Ordering and Fluctuations in alpha'-NaV2O5"
S. Ravy,J. E. Lorenzo
Physics , 2000,
Abstract: We claim that the analysis presented by Gaulin et al. (Phys. Rev. Lett. 84, 3446 (2000)) does not prove the two-dimensional character of the transition in NaV2O5 nor the charge ordering mechanism of the transition.
Timed pushdown automata revisited
Lorenzo Clemente,S？awomir Lasota
Computer Science , 2015,
Abstract: This paper contains two results on timed extensions of pushdown automata (PDA). As our first result we prove that the model of dense-timed PDA of Abdulla et al. collapses: it is expressively equivalent to dense-timed PDA with timeless stack. Motivated by this result, we advocate the framework of first-order definable PDA, a specialization of PDA in sets with atoms, as the right setting to define and investigate timed extensions of PDA. The general model obtained in this way is Turing complete. As our second result we prove NEXPTIME upper complexity bound for the non-emptiness problem for an expressive subclass. As a byproduct, we obtain a tight EXPTIME complexity bound for a more restrictive subclass of PDA with timeless stack, thus subsuming the complexity bound known for dense-timed PDA.
Reachability analysis of first-order definable pushdown systems
Lorenzo Clemente,S？awomir Lasota
Computer Science , 2015,
Abstract: We study pushdown systems where control states, stack alphabet, and transition relation, instead of being finite, are first-order definable in a fixed countably-infinite structure. We show that the reachability analysis can be addressed with the well-known saturation technique for the wide class of oligomorphic structures. Moreover, for the more restrictive homogeneous structures, we are able to give concrete complexity upper bounds. We show ample applicability of our technique by presenting several concrete examples of homogeneous structures, subsuming, with optimal complexity, known results from the literature. We show that infinitely many such examples of homogeneous structures can be obtained with the classical wreath product construction.
Infection prophylaxis and management of viral infection
Emily S. Clausen,Lorenzo Zaffiri
- , 2020, DOI: 10.21037/atm.2019.11.85
Abstract: CARV are common after lung transplantation. In immunocompromised patients these infections can involve the lower respiratory tract and are often associated with significant mortality (1,2). The viral pathogens frequently reported include: influenza A and B, respiratory syncytial virus (RSV), adenovirus, parainfluenza (PIV), human metapneumovirus (hMPV)
Is it plausible to expect a close encounter of the Earth with a yet undiscovered astronomical object in the next few years?  [PDF]
Lorenzo Iorio
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.211146
Abstract: We analytically and numerically investigate the possibility that a still undiscovered body X, moving along an unbound hyperbolic path from outside the solar system, may penetrate its inner regions in the next few years posing a threat to the Earth. By conservatively using as initial position of X the lower bounds on the present‐day distance of X dynamically inferred from the gravitational perturbations induced by it on the orbital motions of the planets of the solar system, both the analyses show that, in order to reach the Earth’s orbit in the next 2 yr, X should move at a highly unrealistic speed , whatever its mass is. For example, by assuming for it a solar ( M ) or brown dwarf mass ( ), now at not less than kau (1 kau=1000 astronomical units), v would be of the order of and of the speed of light c, respectively. By assuming larger present‐day distances for X, on the basis of the lacking of direct observational evidences of electromagnetic origin for it, its speed would be even higher. Instead, the fastest solitary massive objects known so far, like hypervelocity stars (HVSs) and supernova remnants (SRs), travel at , having acquired so huge velocities in some of the most violent astrophysical phenomena like interactions with supermassive galactic black holes and supernova explosions. It turns out that the orbit of the Earth would not be macroscopically altered by a close (0.2 au) passage of such an ultrafast body X in the next 2 yr. On the contrary, our planet would be hurled into the space if a Sun‐sized body X would encounter it by moving at . On the other hand, this would imply that such a X should be now at just 20-30 au, contrary to all direct observational and indirect dynamical evidences.
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