Superposition frames for adaptive time-frequency analysis and fast reconstruction

In this article we introduce a broad family of adaptive, linear time-frequency representations termed superposition frames, and show that they admit desirable fast overlap-add reconstruction properties akin to standard short-time Fourier techniques. This approach stands in contrast to many adaptive time-frequency representations in the extant literature, which, while more flexible than standard fixed-resolution approaches, typically fail to provide efficient reconstruction and often lack the regular structure necessary for precise frame-theoretic analysis. Our main technical contributions come through the development of properties which ensure that this construction provides for a numerically stable, invertible signal representation. Our primary algorithmic contributions come via the introduction and discussion of specific signal adaptation criteria in deterministic and stochastic settings, based respectively on time-frequency concentration and nonstationarity detection. We conclude with a short speech enhancement example that serves to highlight potential applications of our approach.Comment: 16 pages, 6 figures; revised versio

Freud : paradigma del suicidio asistido

1 archivo PDF (14 páginas)Cuando Sigmund Freud falleció en Londres, el 23 de septiembre de 1939, la comunidad médica y el público en general, recibieron la noticia sin sobresaltos, como un deceso más, entre otros, de un destacado médico, neurólogo y psiquiatra, que se encontraba aquejado por una enfermedad terminal, que tarde o temprano, pondría fin a su vida. Tuvieron que pasar 33 años para que conociéramos la verdad sobre ese suceso. Freud le pidió a su médico, el doctor Max Schur, que lo ayudara a bien morir, es decir, le solicitó que lo “asistiera” en este duro trance. La importancia del personaje y las peculiaridades que rodean el acto nos parecieron interesantes para compartirlas con los lectores pues pensamos que la manera en que se realizó ejemplifica un paradigma o modelo del suicidio asistido. When Sigmund Freud died in London, on September 23rd 1939, medical community and public in general received the news without any shock; it was another passing, from a prominent neurologist and phychiatrist, whom had a terminal disease. It took thirty three years to know the true of this event. Freud asked his physician Dr. Max Schur, to help on his well die, meaning to help him to commit assisted suicide. The transcendence of this wellknown person and the peculiarity around his death are in this paper to share with the reader an example of the paradigm or model for assisted suicide. Palabras clave / Key words: Sigmund Freud, suicidio asistido por un médico, literatura y psicoanálisis / Sigmund Freud, physician-assisted suicide, literature and psychoanalysis. tyvlx

Food balancing assessment : a three-way approach

Purpose: The aim of this article is the improvement of the theoretical bases and the development of a scientifically grounded approach balancing the food supply from the economic and the practical application for a complex social and economic assessment of development of the food sphere as a whole. Design/Methodology/Approach: In the process of research the authors’ approach was used to consider the balance of food supply from the position of three structural and consistently interrelated elements-phenomena, process and state. The authors’ interpretation of each element is given, the method of their evaluation is developed, based on the structural division of indicators into balanced ones, exceeding the level of balance and being below the specified level. These indicators are differentiated into 7 functional groups (from the minimum to the maximum degree of balance). Findings: The result is a comparative assessment of the level of balance of food supply in the UK, France, Czech Republic, Latvia and Russia and the definition on its basis of priority directions of development of agriculture in each of the allocated states. Practical Implications: The results of the work can be used by governing bodies to make specific practical decisions in the food sector, and to adjust the directions of its development. Originality/Value: Materials of the article are original and have not been previously published. The calculations were based on official data from the European Statistical Agency, Eurostat and the Federal State Statistics Service of Russia, which indicates the reliability of the presented scientific materials.peer-reviewe