The entropy of the noncommutative acoustic black hole based on generalized uncertainty principle

In this paper we investigate statistical entropy of a 3-dimensional rotating acoustic black hole based on generalized uncertainty principle. In our results we obtain an area entropy and a correction term associated with the noncommutative acoustic black hole when $\lambda$ introduced in the generalized uncertainty principle takes a specific value. However, in this method, it is not needed to introduce the ultraviolet cut-off and divergences are eliminated. Moreover, the small mass approximation is not necessary in the original brick-wall model.Comment: 9 pages, no figures; version to appear in PLB. arXiv admin note: substantial text overlap with arXiv:1210.773

Characterization of chip-size electrically-small antennas for smart wireless biomedical devices

The new requirements for smarter and smaller biomedical microsystems demand for new integration technologies, including antenna integration. This can be solved with the use of microfabrication technologies, allowing the fabrication of chip-size antennas that may be placed on top of silicon wafers. However, due to their ultra-small physical dimensions and special operating conditions (e.g., covered with body tissue phantoms), antenna characterization requires the use of auxiliary custom-made transitions between antenna and test equipment, which are much larger than the antennas under test. Since electrically small antennas show also very small gain, the use of test boards may carry a significant impact on the antenna's characteristics. This paper presents a methodology used to investigate the performance of chip-size 3D antennas (500x500x500 mu m(3)) designed to operate inside the human body in the frequency band 1-8 GHz.This work was supported by Portuguese Foundation for Science and Technology: FCT-PTDC/EEI-TEL/2881/2012, Programa Operacional Temático Fatores de Competitividade (COMPETE) and Fundo Comunitário Europeu FEDER.info:eu-repo/semantics/publishedVersio

60 GHz on-chip antenna array with efficiency improvement using 3D microfabrication technology

The 55-65 GHz band has very interesting characteristics, such as allowing high-bandwidth communications and improved security (due to high absorption). From the antenna point of view, it also has the interesting feature of allowing the fabrication of very small antennas. Because they're so small, these antennas can be placed directly on-chip. However, silicon is a high loss material at such high frequencies. This paper proposes a solution to obtain one antenna array with improved efficiency. Instead of designing the antennas on top of silicon, 3D antennas are designed to lie above the silicon substrate.This work was supported by Portuguese Foundation for Science and Technology: FCT-PTDC/EEI-TEL/2881/2012, Programa Operacional Temático Fatores de Competitividade (COMPETE) and Fundo Comunitário Europeu FEDER.info:eu-repo/semantics/publishedVersio

A hybrid recommendation approach for a tourism system

Many current e-commerce systems provide personalization when their content is shown to users. In this sense, recommender systems make personalized suggestions and provide information of items available in the system. Nowadays, there is a vast amount of methods, including data mining techniques that can be employed for personalization in recommender systems. However, these methods are still quite vulnerable to some limitations and shortcomings related to recommender environment. In order to deal with some of them, in this work we implement a recommendation methodology in a recommender system for tourism, where classification based on association is applied. Classification based on association methods, also named associative classification methods, consist of an alternative data mining technique, which combines concepts from classification and association in order to allow association rules to be employed in a prediction context. The proposed methodology was evaluated in some case studies, where we could verify that it is able to shorten limitations presented in recommender systems and to enhance recommendation quality

RF CMOS Wireless Implantable Microsystem for Sacral Roots Stimulation with On-Chip Antenna and Far-Field Wireless Powering

The use of heterogeneous integration technologies is the path for the development of further miniaturized, smarter, and energy autonomous microdevices, which are required to tackle the challenge of monitoring and/or control the health condition of everyone, everywhere. The interaction with human body requires the use of flexible materials, while the electronic component are based on rigid materials, like silicon substrates. Also, once inside the human body, it is desirable to have a wireless link for data communication, as well for RF powering, using energy harvesting techniques or dedicated powering RF links. This paper shows the design of an implantable microsystem to be used for functional electrical stimulation of sacral roots. The proposed system includes flexible electrodes, integrated with an RF CMOS chip, which is powered by a wireless link through an efficient on-chip antenna.This work was supported by the Portuguese Foundation for Science and Technology (SFRH/BD/62608/2009), FCT-PTDC/EEI-TEL/2881/2012, Programa Operacional Temático Fatores de Competitividade (COMPETE) and Fundo Comunitário Europeu FEDER.info:eu-repo/semantics/publishedVersio

Criança imigrante num serviço de pediatria: que problemas sociais?

Introdução: A zona suburbana de influência do hospital serve uma população que abrange imigrantes oriundos de países em vias de desenvolvimento. Objectivos: Caracterizar a população pediátrica imigrante internada e referenciada ao serviço social e compará-la com a restante população portuguesa. Material e Métodos: Estudo prospectivo realizado entre Novembro de 2004 a Março de 2005. Analisaram-se dados demográficos, sócio-económicos, motivo de internamento e de referenciação ao serviço social e encaminhamento da situação. Resultados: De um total de 35 crianças observadas, 22 (62,8%) eram filhas de imigrantes, 45% com menos de 12 meses, a maioria do sexo feminino (54,5%), raça negra (81,8%) e com más condições sócio-económicas (72,3%). A maioria dos pais (72,7%) era oriunda de um País Africano de Língua Oficial Portuguesa (PALOP) e 58,3% não estavam legalizados no nosso país. A maioria (81,3%) tinha médico de família atribuído. Dezanove (85,7%) foram internados por doença orgânica tendo o problema social sido detectado durante o internamento. Os problemas sociais identificados foram pobreza (9), negligência (7), agressão física (3), abandono (2), maus-tratos psicológicos (1), abuso sexual (1) e outras situações (3). Cinco crianças foram orientadas para a Comissão de Protecção de Menores e uma para o Tribunal. Foram ainda prestados apoios económicos (6) e sociais (4) pelo hospital e pelo Centro de Saúde (1). Comparativamente à população portuguesa avaliada, os problemas sociais são mais frequentes na população imigrante (20% vs 7,5%; p =0,001), com predomínio nas crianças de origem africana (81,8% versus 15,4%; p =0,00). Embora não seja estatisticamente significativo a pobreza (37,5% vs 26,6%% p =0,313) e agressão física (13% vs 8,3% p =0,313) são mais frequentes nos imigrantes, contrariamente à população nacional, que o problema social mais frequente foi a negligência (33,3% vs 29% p =0,313). Discussão: O número crescente de filhos de imigrantes e as deficiências socio económicas desta população, levantam importantes questões relacionadas com a prestação de cuidados sociais a cidadãos estrangeiros, gerando a necessidade de criação de estruturas de apoio social de forma a permitir a sua melhor integração na sociedade

Up-scaling Mate Marote: a university-industry interaction experience

The new digital era opens up great possiblilities in education. Mate Marote is a platform including activities and educational games for massive scale interventions. Recent creation of Fundación Sadosky, has favored the collaboration between industry and academia in projects involving novel methods and ideas with big scale software platforms which require experience in architecture and high-end software development. The collaboration established showed exceptional conditions for the mutual benefit: the incorporation of academic research in educational neuroscience in the industry and the transference of well-established methodology and software development experience in the academic environment.Sociedad Argentina de Informática e Investigación Operativa (SADIO

Up-scaling Mate Marote: a university-industry interaction experience

The new digital era opens up great possiblilities in education. Mate Marote is a platform including activities and educational games for massive scale interventions. Recent creation of Fundación Sadosky, has favored the collaboration between industry and academia in projects involving novel methods and ideas with big scale software platforms which require experience in architecture and high-end software development. The collaboration established showed exceptional conditions for the mutual benefit: the incorporation of academic research in educational neuroscience in the industry and the transference of well-established methodology and software development experience in the academic environment.Sociedad Argentina de Informática e Investigación Operativa (SADIO

Entropy analysis of high-definition transcranial electric stimulation effects on EEG dynamics

A foundation of medical research is time series analysis—the behavior of variables of interest with respect to time. Time series data are often analyzed using the mean, with statistical tests applied to mean differences, and has the assumption that data are stationary. Although widely practiced, this method has limitations. Here we present an alternative statistical approach with sample analysis that provides a summary statistic accounting for the non-stationary nature of time series data. This work discusses the use of entropy as a measurement of the complexity of time series, in the context of Neuroscience, due to the non-stationary characteristic of the data. To elucidate our argument, we conducted entropy analysis on a sample of electroencephalographic (EEG) data from an interventional study using non-invasive electrical brain stimulation. We demonstrated that entropy analysis could identify intervention-related change in EEG data, supporting that entropy can be a useful “summary” statistic in non-linear dynamical systems