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Search Results: 1 - 10 of 25782 matches for " Alberto Pinto "
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Multi-model Music Content Description and Retrieval Using IEEE 1599 XML Standard
Alberto Pinto
Journal of Multimedia , 2009, DOI: 10.4304/jmm.4.1.30-39
Abstract: The new format IEEE 1599 for music and audio content description defines a standard for the representation of retrieval models within music and music/audio formats that makes use of XML documents as content descriptors. In this article, it is described how music/audio semantics can be actually represented within the Structural Layer of IEEE 1599, thanks to the introduction of novel Music Information Retrieval (MIR) objects that can be exploited by music search engines. A complete description of MIR objects is provided and it is shown how they can be used to embed metadata relative to specific music retrieval models, thus allowing for the description of music content in different retrieval contexts. To this aim, a new concept for MIR Model is introduced together with its formalization and tools provided by category theory. The role of MIR objects and morphisms in music content description and retrieval is explained. Furthermore, a concrete example is given with the implementation of a graph-based model within the IEEE 1599 framework.
Reflections on national identity and the state in Latin America Reflexiones sobre la identidad nacional y el Estado en América Latina
Pinto M. Alberto
Cuadernos de Economía , 1998,
Abstract: This article describes and interprets the violent shock to which the native communities of America were subjected. How their forms of social organization were destroyed and how they were replaced by States which took charge of redistributing the natural resources of the continent. In this context, it tries to find the identity of a continent that denies its indigenous past and the knowledge that allowed those communities to coexist in permanent equilibrium with the environment. En este artículo se describe e interpreta el choque violento a que fueron sometidas las comunidades nativas de América. Cómo se destruyeron sus formas de organización social y cómo se remplazaron por Estados que se encargaron de redistribuir los recursos naturales del continente. En este contexto, se pretende encontrar la identidad de un continente que reniega de su pasado indígena y de los conociemientos que permitieron que esas comunidades convivieran en un equilibrio permanente con el medio ambiente.
O regime remuneratório do Centro de Saúde S. Jo?o: "Tubo de Ensaio"
Hespanhol,Alberto; Pinto,Alexandre Sousa;
Arquivos de Medicina , 2005,
Abstract: the aims of this paper was todescribe the experiment on doctors? remunerations in the s?o jo?o health centre and to find an eventual correlation between its evolution and the prescription of medicines (md?s) and diagnostic tests (ead?s) during five years at work. doctors? gross remunerations were noted monthly from the account of the department of general practice, and separated into its components; the amounts spent in mds and ead?s were registered monthly, from the porto health sub region. after starting the new remunerative system, in the second semester of 2002, the incomes showed an upward tendency, continued during the first semester of 2003. during the second semester of 2003 and the year 2004, along with the application of changes to the remunerative system, there was a tendency for stability or even a downward tendency of the incomes. in the beginning of 2002, there was an upward tendency of the total expenses, which was maintained all over 2002 and the next two years. expenses in md increased steadily while those with ead?s were stable. it was not found an evident relationship between doctors? incomes and expenses in md?s and ead?s, permitting the allegation that the incentives to the productivity in the conditions established in this health centre do not have remarkable consequences on the expenses. the incentives established in this experiment resulted in an average increase of the incomes in about 40%, the most significant contribution being given by the incentives to rational prescription.
Cinco anos do Centro de Saúde S. Jo?o: "Tubo de Ensaio"
Hespanhol,Alberto; Pinto,Alexandre Sousa;
Arquivos de Medicina , 2005,
Abstract: the aims of this work was to describe, in general, the work done at s?o jo?o health centre and its cost in five years of activity. data from the functioning of s?o jo?o health centre, available at the computer system of the department of general practice and of the porto health sub region, were collected monthly. the results of the health care programs in s?o jo?o health centre, in the years 1999 to 2004 are quite similar to those found in many other portuguese health centres. they demonstrate that it has been possible to deliver satisfactory primary health care at the cost of 129.31 ? per year, per registered patient. the increase of the indexes of price per consultation and per registered patient during the period were similar, the latter showing some tendency to stabilise in the last year. the average price per prescription showed some stability, showing an upward tendency in 2004. the annual capitation per registered patient, 129.31 ?, didn?t include the expenses in the premises, in the equipment, with the public health staff, with vaccines, contraceptive pills and the nhs forms. however, in addition to the expenses with the staff, therapeutic drugs, diagnostic tests, maintenance of the premises and of the equipment, were included "other expenses". the "other expenses" included dressing materials, physiotherapy, oxygen therapy, aerosoltherapy, nebulizations and mechanical ventilation (cpaps) prescribed in s?o jo?o health centre. absurdly, high expenses with haemodialysis of patients registered in s?o jo?o health centre were also included.
Capa: a produ o, o consumo e a qualidade da manga no Brasil
Pinto Alberto Carlos de Queiroz
Revista Brasileira de Fruticultura , 2002,
Universality in the stock exchange
Rui Gon?alves,Alberto Pinto
Physics , 2008,
Abstract: We analyze the constituents stocks of the Dow Jones Industrial Average (DJIA30) and the Standard & Poor's 100 index (S&P100) of the NYSE stock exchange market. Surprisingly, we discover the data collapse of the histograms of the DJIA30 price fluctuations and of the S&P100 price fluctuations to the universal non-parametric Bramwell-Holdsworth-Pinton (BHP) distribution. Since the BHP probability density function appears in several other dissimilar phenomena, our result reveals an universal feature of the stock exchange market.
Synchrony-optimized power grids
Rafael S. Pinto,Alberto Saa
Physics , 2014,
Abstract: We investigate synchronization in power grids, which we assume to be modeled by a network of Kuramoto oscillators with inertia. More specifically, we study the optimization of the power grid topology to favor the network synchronization. We introduce a rewiring algorithm which consists basically in a hill climb scheme where the edges of the network are swapped in order enhance the main measures of synchronization. As a byproduct of the optimization algorithm, we typically have also the anticipation of the synchronization onset for the optimized network. We perform several robustness tests for the synchrony-optimized power grids, including the impact of consumption peaks. In our analyses, we investigate synthetic random networks, which we consider as hypothetical decentralized power generation situations, and also a network based in the actual power grid of Spain, which corresponds to the current paradigm of centralized power grids. The synchrony-optimized power grids obtained by our algorithm have some interesting generic properties and patterns. Typically, they have the majority of edges connecting only consumers to generators in the decentralized case, whereas synchrony optimized centralized power grids have a minimal number of vertices with just one or two neighbors, known generically as dead ends and which have been recently identified as extremely vulnerable and responsible for cascade faults. Despite the extreme simplifications adopted in our model, our results, among others recently obtained in the literature, can provide interesting principles to guide future growth and development of real power grids.
Explosive synchronization with partial degree-frequency correlation
Rafael S. Pinto,Alberto Saa
Physics , 2014, DOI: 10.1103/PhysRevE.91.022818
Abstract: Networks of Kuramoto oscillators with a positive correlation between the oscillators frequencies and the degree of the their corresponding vertices exhibits the so-called explosive synchronization behavior, which is now under intensive investigation. Here, we study and report explosive synchronization in a situation that has not yet been considered, namely when only a part, typically small, of the vertices is subjected to a degree frequency correlation. Our results show that in order to have explosive synchronization, it suffices to have degree-frequency correlations only for the hubs, the vertices with the highest degrees. Moreover, we show that a partial degree-frequency correlation does not only promotes but also allows explosive synchronization to happen in networks for which a full degree-frequency correlation would not allow it. We perform exhaustive numerical experiments for synthetic networks and also for the undirected and unweighted version of the neural network of the worm Caenorhabditis elegans. The latter is an explicit example where partial degree-frequency correlation leads to explosive synchronization with hysteresis, in contrast with the fully correlated case, for which no explosive synchronization is observed.
Optimal synchronization of Kuramoto oscillators: a dimensional reduction approach
Rafael S. Pinto,Alberto Saa
Physics , 2015, DOI: 10.1103/PhysRevE.92.062801
Abstract: A recently proposed dimensional reduction approach for studying synchronization in the Kuramoto model is employed to build optimal network topologies to favor or to suppress synchronization. The approach is based in the introduction of a collective coordinate for the time evolution of the phase locked oscillators, in the spirit of the Ott-Antonsen ansatz. We show that the optimal synchronization of a Kuramoto network demands the maximization of the quadratic function $\omega^T L \omega$, where $\omega$ stands for the vector of the natural frequencies of the oscillators, and $L$ for the network Laplacian matrix. Many recently obtained numerical results can be re-obtained analytically and in a simpler way from our maximization condition. A computationally efficient {hill climb} rewiring algorithm is proposed to generate networks with optimal synchronization properties. Our approach can be easily adapted to the case of the Kuramoto models with both attractive and repulsive interactions, and again many recent numerical results can be rederived in a simpler and clearer analytical manner.
Rigidity of $C^2$ Infinitely Renormalizable Unimodal Maps
Wellington de Melo,Alberto Pinto
Mathematics , 1999, DOI: 10.1007/s002200050749
Abstract: Given $C^2$ infinitely renormalizable unimodal maps $f$ and $g$ with a quadratic critical point and the same bounded combinatorial type, we prove that they are $C^{1+\alpha}$ conjugate along the closure of the corresponding forward orbits of the critical points, for some $\alpha>0$.
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