1,350 research outputs found
Homogeneous polar foliations of complex hyperbolic spaces
We prove that, up to isometric congruence, there are exactly 2n+1 homogeneous
polar foliations of the complex hyperbolic space. We also give an explicit
description of each of these foliations.Comment: minor corrections, one reference adde
Model and neural control of the depth of anesthesia during surgery
At present, the experimentation of anesthetic drugs on
patients requires a regulation protocol, and the response of each patient
to several doses of entry drug must be well known. Therefore, the
development of pharmacological dose control systems is a promising
field of research in anesthesiology.
In this paper it has been developed a non-linear compartmental
pharmacokinetic-pharmacodynamical model which describes the
anesthesia depth effect on a sufficiently reliable way over a set of
patients with the depth effect quantified by the Bi-Spectral Index.
Afterwards, an Artificial Neural Network (ANN) predictive controller
has been designed based on the depth of anesthesia model so as to keep
the patient on the optimum condition while he undergoes surgical
treatment.
For the purpose of quantifying the efficiency of the neural predictive
controller, a classical proportional-integral-derivative controller has
also been developed to compare both strategies. Results show the
superior performance of predictive neural controller during Bi-
Spectral Index reference tracking.Universidad de Málaga. Campus de Excelencia Internacional AndalucĂa Tech
The LISA PathFinder DMU and Radiation Monitor
The LISA PathFinder DMU (Data Management Unit) flight model was formally
accepted by ESA and ASD on 11 February 2010, after all hardware and software
tests had been successfully completed. The diagnostics items are scheduled to
be delivered by the end of 2010. In this paper we review the requirements and
performance of this instrumentation, specially focusing on the Radiation
Monitor and the DMU, as well as the status of their programmed use during
mission operations, on which work is ongoing at the time of writing.Comment: 11 pages, 7 figures, prepared for the Proceedings of the 8th
International LISA Symposium, Classical and Quantum Gravit
Late-stage diagnosis of HIV infection in Brazilian children: evidence from two national cohort studies
This study analyzed data from two consecutive retrospective cohort samples (1983 to 1998 and 1999 to 2002) of Brazilian children with AIDS (N = 1,758) through mother-to-child-transmission. Late-stage diagnosis (CDC category C) was investigated in relation to the following variables: year of birth, year of HIV diagnosis, and time periods related to changes in government treatment guidelines. Late-stage diagnosis occurred in 731 (41.6%) of cases and was more prevalent in infants under 12 months of age. The rate of late-stage diagnosis decreased from 48% to 36% between the two periods studied. We also observed a reduction in the proportion of late-stage diagnoses and the time lapse between HIV diagnosis and ART initiation. A significant association was found between timely diagnosis and having been born in recent years (OR = 0.62; p = 0.009) and year of HIV diagnosis (OR = 0.72; p = 0.002/OR = 0.62; p < 0.001). Infants under the age of 12 months were more likely to be diagnosed at a late stage than older children (OR = 1.70; p = 0.004). Despite advances, there is a need to improve the effectiveness of policies and programs focused on improving early diagnosis and management of HIV/AIDS
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