106 research outputs found
Notas acerca de la sobreproducción de arte, la posfotografía y lo digital
No full textEn aquest assaig es fa una anàlisi del decàleg de la postfotografia. Es discuteixen quatre dels seus aspectes: l'autoria, la prescripció del sentit, el reciclatge com a estratègia postcreativa, allò lúdic i la trinxera. Malgrat reconèixer els fenòmens registrats, es mostrarà que les solucions proposades no resolen els problemes, ja que fan falta la relació més profunda amb les qüestions filosòfiques de la postmodernitat, la revisió dels pressupostos moderns que implícitament queden en el concepte d'art i la relació amb els processos creatius i productius característics dels mitjans digitals. En les conclusions es presentaran algunes hipòtesis de recerca teòrica i artística alternatives, que, en vista de les eines digitals, valen per a totes les arts, els llenguatges expressius i els mitjans de comunicació.This essay discusses the post-photography statement in terms of its most important concepts: the author, poiesis as a prescription of meaning, recycling as artistic strategy, serendipity and art’s social and political struggle. Even sharing the fundamentals of Fontcuberta’s decalogue, it is necessary to underline that problems of overproduction cannot be actually solved. Something more is needed: a structural relationship with postmodern philosophical problems; a suppression of unrecognized modern aesthetic foundations; and a deeper analysis of the properties of digital media and technologies. Moreover, the photographic point of view is too narrow to grasp all the aesthetic consequences of the described artistic postmodern conditions. As a conclusion, some different hypotheses concerning uncommon theoretical and artistic practices are discussed. En este ensayo se hace un análisis del decálogo de la posfotografía. Se discuten cuatro de sus aspectos: la autoría, la prescripción del sentido, el reciclaje como estrategia poscreativa, lo lúdico y la trinchera. A pesar de reconocer los fenómenos registrados, se mostrará que las soluciones propuestas no resuelven los problemas, pues hacen falta la relación más profunda con las cuestiones filosóficas de la posmodernidad, la revisión de los presupuestos modernos que implícitamente quedan en el concepto de arte, y la relación con los procesos creativos y productivos característicos de los medios digitales. En las conclusiones se presentarán algunas hipótesis de investigación teórica y artística alternativas, que a la luz de las herramientas digitales valen para todas las artes, los lenguajes expresivos y los medios de comunicación
Criticisms of digital art: Foundations and theoretical limits
No full textThis article attempts a critical examination of the actual digital art production, posing key questions about its artistic value inside the contemporary esthetic discourse, including the relationships with the art system. Considering the properties of the numeric language, two important topics will be discussed: the dialectic artwork-process and the meaning of digital multimedia. With the support of up-to-date computational creativity theories and the evidences of experimental digital art, the treacherous influence of the romantic aesthetic paradigm and the traditional art system will be tested. As a possible solution, the author suggests rethinking the components of software as meta-medium, such as its information assets, its algorithms, the code textual properties, interactivity and interfaces. In the conclusions it will be stressed that the immateriality of software is paramount to avoid misunderstandings and to open new fields of research. For instance, natural computation, ethnomathematics and ethno-computing are valuable social and educational contents and meanings that could substantially improve digital art
25 años de Cirugía Vascular en La Plata (31/12/56 al 31/12/81)
No full textThe author exposes et experience o f 25 years in vascularsurgery ahalyzing 2092 operation's results.E I autor expone la experiencia de 25 años de cirugíavascular, analizando los resultados obtenidos en2092 interv enciones quirúrgicas
Contributions to the understanding of Bayesian consistency.
No full textConsistency of Bayesian nonparametric procedures has been the focus of a considerable amount of research. Here we deal with strong consistency for Bayesian density estimation. An awkward consequence of inconsistency is pointed out. We investigate reasons for inconsistency and precisely identify the notion of “data tracking”. Specific examples in which this phenomenon can not occur are discussed. When it can happen, we show how and where things can go wrong, in particular the type of sets where the posterior can put mass.Bayesian consistency; Density estimation; Hellinger distance; Weak neighborhood
On consistency of nonparametric normal mixtures for Bayesian density estimation.
No full textThe past decade has seen a remarkable development in the area of Bayesian nonparametric inference both from a theoretical and applied perspective. As for the latter, the celebrated Dirichlet process has been successfully exploited within Bayesian mixture models leading to many interesting applications. As for the former, some new discrete nonparametric priors have been recently proposed in the literature: their natural use is as alternatives to the Dirichlet process in a Bayesian hierarchical model for density estimation. When using such models for concrete applications, an investigation of their statistical properties is mandatory. Among them a prominent role is to be assigned to consistency. Indeed, strong consistency of Bayesian nonparametric procedures for density estimation has been the focus of a considerable amount of research and, in particular, much attention has been devoted to the normal mixture of Dirichlet process. In this paper we improve on previous contributions by establishing strong consistency of the mixture of Dirichlet process under fairly general conditions: besides the usual Kullback–Leibler support condition, consistency is achieved by finiteness of the mean of the base measure of the Dirichlet process and an exponential decay of the prior on the standard deviation. We show that the same conditions are sufficient for mixtures based on priors more general than the Dirichlet process as well. This leads to the easy establishment of consistency for many recently proposed mixture models.Bayesian nonparametrics; Density estimation; Mixture of Dirichlet process; Normal mixture model; Random discrete distribution; Strong consistency
Domestication and divergence of Saccharomyces cerevisiae beer yeasts
No full textWhereas domestication of livestock, pets, and crops is well documented, it is still unclear to what extent microbes associated with the production of food have also undergone human selection and where the plethora of industrial strains originates from. Here, we present the genomes and phenomes of 157 industrial Saccharomyces cerevisiae yeasts. Our analyses reveal that today's industrial yeasts can be divided into five sublineages that are genetically and phenotypically separated from wild strains and originate from only a few ancestors through complex patterns of domestication and local divergence. Large-scale phenotyping and genome analysis further show strong industry-specific selection for stress tolerance, sugar utilization, and flavor production, while the sexual cycle and other phenotypes related to survival in nature show decay, particularly in beer yeasts. Together, these results shed light on the origins, evolutionary history, and phenotypic diversity of industrial yeasts and provide a resource for further selection of superior strains
What drives the adoption of SHRM in Indian Companies?
No full textManagerial innovation and its critical importance in today's global business is well documented. The crucial role of managerial innovation in strategic human resource management is becoming increasingly prevalent in both business and academic literature. However, practically no such study has been undertaken in an emerging country scenario as India. This study identifies the drivers of adoption of innovative strategic human resource practices (SHRM) in Indian organizations. This study is of critical importance against the backdrop of the liberalization of the Indian economy which started in 1991. The structural adjustments due to liberalization have created a hyper-competitive and turbulent environment. Drawing from both innovation and SHRM literature this research report discusses five main propositions of adoption of innovative SHRM practices in Indian organizations. The generalisability, applicability, acceptability, and the diffusion of practices are discussed.Strategic planning; HRM; Innovation; India
Efeito de plantas de cobertura de inverno sobre cultivos de milho e feijão em sistema de plantio direto em três regiões do estado de Santa Catarina
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Agrárias, Programa de Pós-Graduação em Agroecossistemas, Florianópolis, 2009O sistema vigente de plantio direto depende do uso intensivo de herbicidas. A utilização de plantas de cobertura de inverno é um fator de grande importância nas estratégias que visam substituir o uso desses agrotóxicos e viabilizar a transição desse sistema para o sistema agroecológico. Este estudo teve como objetivos definir a melhor proporção de Secale cereale, Vicia sativa e Raphanus sativus para o controle de plantas espontâneas e promoção do rendimento de milho e feijão em mono e em policultivo no sistema de plantio direto. Os experimentos foram conduzidos nas Estações Experimentais da Epagri de Chapecó, Campos Novos e Ituporanga. Mensurou-se a fitomassa de plantas de cobertura de inverno e de plantas espontâneas durante o ciclo das plantas de cobertura (t/ha matéria seca), a cobertura do solo pelas plantas de cobertura de inverno (%), o rendimento das culturas comerciais em mono e policultivo (t/ha) e a fitomassa de plantas espontâneas durante o ciclo das culturas de verão (t/ha matéria seca). De maneira geral, nas três regiões, os tratamentos estudados não apresentaram diferenças estatísticas quanto á produção de fitomassa de plantas de cobertura de inverno e de plantas espontâneas, cobertura do solo e supressão das plantas espontâneas de verão. Em Ituporanga a produção de fitomassa de plantas de cobertura e a supressão de plantas espontâneas foram bem superiores em relação ao observado nos outros experimentos. Essa diferença deve-se ao fato de ter sido utilizado um acréscimo de 140% sobre a quantidade de sementes de plantas de cobertura testada em Chapecó e Campos Novos. Nos três experimentos não houve produção de grãos viáveis de feijão uma vez que o desenvolvimento foi prejudicado por fatores de competição com plantas espontâneas e de clima. Os rendimentos de milho nos experimentos de Campos Novos e Chapecó foram baixos em razão da grande quantidade de plantas espontâneas que se desenvolveram no local. Em Ituporanga foram obtidos bons rendimentos com o milho cultivado em sistema de mono e policultivo, que alcançaram produções de 6,7 e 5,3 t/ha respectivamente. No policultivo houve diferença estatística entre os tratamentos estudados, em que os tratamentos com predominância de centeio e com mistura das culturas de cobertura em partes iguais apresentaram o maior rendimento de grãos. Com base nos valores de rendimento de grãos da cultura do milho cultivado no experimento de Ituporanga, e nos valores gastos com as sementes das plantas de cobertura de inverno, verificou-se a viabilidade econômica do plantio direto sem herbicidas para essa cultura quando em sucessão às diferentes coberturas de inverno combinadas e semeadas nas densidades adequadas para esse sistema
Erratum: Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory
No full textExposure calculation Due to a mistake in the numerical integration following eq. (6.2) of the original article [1], the exposure shown in figure 5 of the original article was incorrect. The correct exposure is shown in figure 1. 2 Upper limits on the integral photon flux and fraction The incorrect exposure affects the calculation of the upper limits on the integral photon flux following eq. (6.1) of the original article. The correct values for the upper limits are 0.038, 0.010, 0.009, 0.008 and 0.007 km−2 sr−1 yr−1 for threshold energies of 1, 2, 3, 5 and 10 EeV. The correct values for the upper limits on the integral photon fraction subsequently derived are 0.14 %, 0.17 %, 0.42 %, 0.86 % and 2.9 % for the same threshold energies. 3 Author list The author list of this erratum also corrects a mistake made in the original article, where F. Zuccarello was missing and Z. Zong was listed twice
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