Universidade Federal de Minas Gerais

About: Universidade Federal de Minas Gerais is a education organization based out in Belo Horizonte, Minas Gerais, Brazil. It is known for research contribution in the topics: Population & Context (language use). The organization has 41631 authors who have published 75688 publications receiving 1249905 citations.

Fault management in event-driven wireless sensor networks

Abstract: Wireless Sensor Networks (WSNs) have emerged as a new monitoring and control solution for a variety of applications. Although the behavior of a WSN is characterized by the type of its application, a common element exist: faults are a normal fact, not isolated events as in traditional networks. Thus, in order to guarantee the network quality of service it is essential for the WSN to be able to detect failures and perform something akin to healing, recovering from events that might cause some of its parts to malfunction. In this work we propose and evaluate a failure detection scheme using a management architecture for WSNs, called MANNA. We take a deep look at its fault management capabilities supposing the existence of an event-driven WSN. This is a challenging and attractive kind of WSN and we show how the use of automatic management services defined by MANNA can provide self-configuration, self-diagnostic, and self-healing (some of the self-managing capabilities). We also show that the management solution promote the resources productivity without incurring a high cost to the network.

Mortalidade perinatal e evitabilidade: revisão da literatura

Abstract: This is a literature review onperinatal mortality focusing its evitability. A Medline and Lilacs (Latin-America and Caribbean) search was conducted for the 90s. There are few research studies on this subject in Brazil due to the great number of underreported fetal deaths and the low quality information provided in death certificates. Different proposals for perinatal death classification are presented. Most are based on grouping the underlying causes of deaths in a functional system in order to facilitate the analysis. In the Wigglesworth classification system, one of the most recommended methods, deaths are related to the different stages of care for pregnant women and children, evidencing the possibilities of their prevention. The evitability approach of perinatal deaths in Brazil is highly recommended, as mortality rates are still very high and most of the deaths are considered avoidable. Premature deaths could be avoided improving the quality of health care. Besides improving the medical assistance, the organization of health care regarding pre-natal, birth and neonatal care must also be better developed to ensure access to qualified assistance.

Brain-Selective Overexpression of Human Angiotensin-Converting Enzyme Type 2 Attenuates Neurogenic Hypertension

Abstract: Rationale: Angiotensin converting enzyme type 2 (ACE2) is a new member of the brain renin-angiotensin system, that might be activated by an overactive renin-angiotensin system. Objective: To clarify the role of central ACE2 using a new transgenic mouse model with human (h)ACE2 under the control of a synapsin promoter, allowing neuron-targeted expression in the central nervous system. Methods and Results: Syn-hACE2 (SA) transgenic mice exhibit high hACE2 protein expression and activity throughout the brain. Baseline hemodynamic parameters (telemetry), autonomic function, and spontaneous baroreflex sensitivity (SBRS) were not significantly different between SA mice and nontransgenic littermates. Brain-targeted ACE2 overexpression attenuated the development of neurogenic hypertension (Ang II infusion: 600 ng/kg per minute for 14 days) and the associated reduction of both SBRS and parasympathetic tone. This prevention of hypertension by ACE2 overexpression was reversed by blockade of the Ang-(1-7) receptor (d...