3,899 research outputs found
A Microcontroller Based System for Controlling Patient Respiratory Guidelines
The need of making improvements in obtaining (in a non-invasive
way) and monitoring the breathing rate parameters in a patient emerges due to
(1) the great amount of breathing problems our society suffer, (2) the problems
that can be solved, and (3) the methods used so far. Non-specific machines are
usually used to carry out these measures or simply calculate the number of
inhalations and exhalations within a particular timeframe. These methods lack of
effectiveness and precision thus, influencing the capacity of getting a good
diagnosis. This proposal focuses on drawing up a technology composed of a
mechanism and a user application which allows doctors to obtain the breathing
rate parameters in a comfortable and concise way. In addition, such parameters
are stored in a database for potential consultation as well as for the medical
history of the patients. For this, the current approach takes into account the
needs, the capacities, the expectations and the user motivations which have been
compiled by means of open interviews, forum discussions, surveys and application
uses. In addition, an empirical evaluation has been conducted with a set of
volunteers. Results indicate that the proposed technology may reduce cost and
improve the reliability of the diagnosis.Ministerio de EconomÃa y Competitividad TIN2016-76956-C3-2-RMinisterio de EconomÃa y Competitividad TIN2015-71938-RED
Maximal slicings in spherical symmetry: local existence and construction
We show that any spherically symmetric spacetime locally admits a maximal
spacelike slicing and we give a procedure allowing its construction. The
construction procedure that we have designed is based on purely geometrical
arguments and, in practice, leads to solve a decoupled system of first order
quasi-linear partial differential equations. We have explicitly built up
maximal foliations in Minkowski and Friedmann spacetimes. Our approach admits
further generalizations and efficient computational implementation. As by
product, we suggest some applications of our work in the task of calibrating
Numerical Relativity complex codes, usually written in Cartesian coordinates.Comment: 25 pages, 6 figure
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