1,192 research outputs found
A framework for the global computing system
No full textThesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (p. 65).by Amit R. Patel.M.Eng
Objective selection of short-axis slices for automated quantification of left ventricular size and function by cardiovascular magnetic resonance
No full textBackground: Quantification of left ventricular (LV) volume from cardiovascular magnetic resonance images relies on subjective and often challenging selection of short-axis (SAX) slices. We hypothesized that this could be solved by defining mitral annular (MA) plane and apex in long-axis (LAX) views, which could be combined with automated LV volume analysis that does not rely on manual tracing of the endocardial border. Methods: SAX images from 50 subjects were analyzed using custom software. LV apex and insertion points of the mitral leaflets were marked on LAX views and used to approximate MA plane. End-systolic and end-diastolic LV volumes (ESV, EDV) were measured while including only slices or their parts located between MA plane and LV apex. Endocardial borders were automatically detected using our previously validated algorithm and also manually traced to obtain reference values. Results: Selection of anatomic landmarks in LAX views allowed automated measurement of LV volumes without the need for subjective slice selection. Intertechnique comparisons resulted in high correlations (EDV: r. = 0.95; ESV: r. = 0.96) and small biases (1 and 9 ml). Combined three-dimensional displays of LAX and SAX views with the MA plane showed that in 7/10 worst cases, intertechnique discordance was due to incorrect manual tracing at LV base that erroneously included part of atrial cavity in LV volume or excluded part of LV cavity, i.e., incorrect reference values. Conclusion: Defining the MA plane and apex in the LAX views obviates the need for subjective slice selection and eliminates errors in LV volume measurements
Exploring young students creativity: The effect of model eliciting activities
No full textThe aim of this paper is to show how engaging students in real-life mathematical situations can stimulate their mathematical creative thinking. We analyzed the mathematical modeling of two girls, aged 10 and 13 years, as they worked on an authentic task involving the selection of a track team. The girls displayed several modeling cycles that revealed their thinking processes, as well as cognitive and affective features that may serve as the foundation for a methodology that uses model-eliciting activities to promote the mathematical creative process
Hausdorff dimension of invariant sets and positive linear operators
No full textIn this thesis we obtain theorems which give the Hausdorff dimension of the invariant set for a family of contraction mappings on a complete, perfect metric space. We obtain results for the graph-directed systems similar to that of Mauldin and Williams [17] but for more general contraction mappings which are "infinitesimal similitudes" rather than just "similitudes". Also the underlying spaces are not assumed to be finite dimensional. For finite graph-directed systems our results are valid on any bounded, complete, perfect metric space. We use the theory of positive linear operators and generalizations of the Krein-Rutman theorem to characterize the Hausdorff dimension as the unique value of δ > 0 for which r(L δ) = 1, where Lδ , δ > 0, is a naturally associated family of positive linear operators and r(Lδ ) denotes the spectral radius of Lδ . We also obtain theorems for infinite graph-directed systems (with finitely many vertices and countably many edges) on compact, perfect metric spaces. In this case too we have a family of positive linear operators Lδ for δ > δ₀ > 0, and the Hausdorff dimension of the invariant set is given by the infimum of δ > δ₀ for which r(L δ) < 1. We discuss an infinte iterated function system given by complex continued fractions and obtain lower bound for the Hausdorff dimension of the invariant set. Our estimate improves the lower bound to 1.787 from 1.2484 obtained in [16]. Finally we also give a theorem proving the continuity of the Hausdorff dimension with respect to the contractions in the graph-directed systems.Ph. D.Includes bibliographical referencesIncludes vitaby Amit Priyadarsh
El proceso de creación de la película Bridge (2016): el proceso alquímico de transformarse individual y socialmente
No full textThe author and director of the film Bridge (2016), Amit R. Biswas, reflects on the process of film-making, using strategies that deal with self (and, therefore, social) transformation through art. In a sort of inner confession monologue, he delves not only into the more anecdotal part of the logistics and economic tour-de-force problems that producing a film involve; but also, and more interestingly, in the causes, nuances, and psychological details that are contained in the plot. Seen as a process of catharsis and posterior anagnorisis, the film unveils the subtle influences that underlie human contact, the transformation of the human psyche by means of compassionate attitudes, and the mutual redemption suffered by the seeming victim and his apparent saviour, in a sort of alchemic metempsychosis released by mutual understanding and empathy.El autor y director de la película Bridge (2016), Amit R. Biswas, reflexiona sobre el proceso de creación y producción cinematográficas, utilizando para ello estrategias que tienen que ver con la transformación del yo (y, por ende, de la sociedad) a través del arte. En una suerte de monólogo-confesión interior, el director profundiza no solo sobre esa parte más anecdótica de la logística y de los enormes problemas económicos que se suscitan cuando se produce un largometraje; lo hace también, lo que es más interesante, sobre las causas, matices y detalles psicológicos que están contenidos en la trama. Visto el film como un proceso de catarsis y posterior anagnórisis, se desvelan en él las sutiles influencias que subyacen en el contacto humano, la transformación de la psique por medio de unas actitudes compasivas, y la redención mutua que sufren la aparente víctima y el que parece su salvador, en una metempsícosis alquímica catalizada por la comprensión y la empatía mutuas
El proceso de creación de la película Bridge (2016): El proceso alquímico de transformarse individual y socialmente
No full textThe author and director of the film Bridge (2016), Amit R. Biswas, reflects on the process
of film-making, using strategies that deal with self (and, therefore, social) transformation
through art. In a sort of inner confession monologue, he delves not only into the more
anecdotal part of the logistics and economic tour-de-force problems that producing a film
involve; but also, and more interestingly, in the causes, nuances, and psychological details
that are contained in the plot. Seen as a process of catharsis and posterior anagnorisis, the
film unveils the subtle influences that underlie human contact, the transformation of the
human psyche by means of compassionate attitudes, and the mutual redemption suffered by
the seeming victim and his apparent saviour, in a sort of alchemic metempsychosis released
by mutual understanding and empathy.El autor y director de la película Bridge (2016), Amit R. Biswas, reflexiona sobre el proceso
de creación y producción cinematográficas, utilizando para ello estrategias que tienen que ver
con la transformación del yo (y, por ende, de la sociedad) a través del arte. En una suerte de
monólogo-confesión interior, el director profundiza no solo sobre esa parte más anecdótica
de la logística y de los enormes problemas económicos que se suscitan cuando se produce
un largometraje; lo hace también, lo que es más interesante, sobre las causas, matices y
detalles psicológicos que están contenidos en la trama. Visto el film como un proceso de
catarsis y posterior anagnórisis, se desvelan en él las sutiles influencias que subyacen en el
contacto humano, la transformación de la psique por medio de unas actitudes compasivas,
y la redención mutua que sufren la aparente víctima y el que parece su salvador, en una
metempsícosis alquímica catalizada por la comprensión y la empatía mutuas
An open letter to Mehra et al and The New England Journal of Medicine
No full textOpen letter to Mandeep R. Mehra, Sapan S. Desai, SreyRam Kuy, Timothy D. Henry, and Amit N. Patel, authors of “Cardiovascular Disease, Drug Therapy, and Mortality in Covid-19”. NEJM. 2020 May 1 DOI: 10.1056/NEJMoa2007621
and to Eric J Rubin (Editor-in-Chief of the New England Journal of Medicine and NEJM Group)
Diagnostic usefulness of myocardial perfusion imaging in patients reluctant to undergo angiography
No full textAkhil Narang, Amita Singh, Amit R Patel Department of Medicine, Section of Cardiology, University of Chicago, Chicago, IL, USA Abstract: Patients with known or suspected coronary artery disease are often referred for ischemic testing to aid in risk assessment and guide management when symptoms develop. Invasive coronary angiography and percutaneous intervention are typically reserved for patients with symptoms refractory to medical management. The use of noninvasive modalities with myocardial perfusion imaging is a powerful diagnostic and prognostic tool for patients reluctant to undergo angiography. This review focuses on evaluation of coronary artery disease with myocardial perfusion imaging using single-photon emission computerized tomography, positron emission tomography, myocardial contrast echocardiography, cardiovascular magnetic resonance, and cardiovascular computerized tomography. Keywords: noninvasive, myocardial perfusion imaging, coronary artery disease, stable angin
Amit Goswani's “Monist Idealism”: Assumption for a "quantum ethics"
No full textEste estudo tem como tema o idealismo monista de Amit Goswami, que postula a Consciência Quântica como princípio unificador e mediador de toda a realidade em suas diversas facetas, manifestas ou potenciais. Analisar-se-á conceitos e experimentos, elucidando os principais elementos teóricos para a efetivação de uma Ética Quântica. A pesquisa se justifica pelo fato de a Física Quântica ser fundamento teórico para muitas invenções tecnológicas e ainda não existirem estudos acadêmicos que mostrem as implicações éticas desta ciência, tecnicamente bem-sucedida. Existem algumas pesquisas nas ciências humanas e na filosofia que tomam a Física Quântica como matriz teórica orientadora, contudo, ainda não relacionam diretamente os seus princípios à Ética. Assim, objetiva-se responder ao questionamento sobre o pressuposto necessário para a edificação de uma ética quântica, a partir do pensamento de Goswami. A metodologia empregada é de análise bibliográfica crítica das principais obras do físico Amit Goswami, sendo O universo autoconsciente (2003) a principal, por oferecer os elementos teóricos básicos para compreensão da temática pesquisada, pois nas demais obras, o autor explora os conceitos fundamentais nela apresentados. Fragmentos das Enéadas de Plotino serão utilizados para a construção de uma analogia, deste modo, justificando o monismo idealista aqui proposto. Visto que no trabalho traça-se a trajetória que faz Goswami desembocar na teoria do Idealismo Monista, mediante as implicações contraditórias da interpretação da Física Quântica, quando subsidiada pelos princípios “materialistas”. O conceito de “consciência quântica” será trabalhado como sendo o agente causal de suas possibilidades intrínsecas com o “colapso da função de onda”. Espera-se, como resultado, evidenciar uma nova perspectiva de investigação da Ética a partir de uma abordagem sistêmica incluindo em seu arcabouço teórico elementos dinâmicos e estáticos enunciando a dialética da vida humana em suas relações.This study has as its theme the monist idealism of Amit Goswami, who postulates Quantum Consciousness as a unifying principle and mediator of all reality in its various facets, manifest or potential. Concepts and experiments will be analyzed, elucidating the main theoretical elements for the realization of a Quantum Ethics. The research is justified by the fact that Quantum Physics is a theoretical foundation for many technological inventions and there are still no academic studies that show the ethical implications of this technically successful science. There are some researches in the humanities and philosophy that take Quantum Physics as a guiding theoretical matrix, however, they do not yet directly relate its principles to Ethics. Thus, the objective is to answer the question about the necessary assumption for the construction of a quantum ethics, based on Goswami's thought. The methodology used is a critical bibliographic analysis of the main works of the physicist Amit Goswami, being O universo autoconsciente (2003) the main one, for offering the basic theoretical elements for understanding the researched theme, because in other works, the author explores the fundamental concepts in it presented. Fragments of Plotinus' Aeneas will be used to construct an analogy, thus justifying the idealistic monism proposed here. Since the work traces the trajectory that makes Goswami lead to the theory of Monist Idealism, through the contradictory implications of the interpretation of Quantum Physics, when subsidized by the “materialist” principles. The concept of "quantum consciousness" will be worked on as the causal agent of its intrinsic possibilities with the "collapse of the wave function". It is hoped, as a result, to highlight a new perspective of research on Ethics from a systemic approach including in its theoretical framework dynamic and static elements enunciating the dialectic of human life in its relations
First Clinical Experience With 3-Dimensional Echocardiographic Transillumination Rendering
No full text- …
