3 research outputs found
Mobile activity recognition and fall detection system for elderly people using Ameva algorithm
Currently, the lifestyle of elderly people is regularly monitored in order to establish
guidelines for rehabilitation processes or ensure the welfare of this segment of the
population. In this sense, activity recognition is essential to detect an objective set of
behaviors throughout the day. This paper describes an accurate, comfortable and efficient
system, which monitors the physical activity carried out by the user. An extension to an
awarded activity recognition system that participated in the EvAAL 2012 and EvAAL 2013
competitions is presented. This approach uses data retrieved from accelerometer sensors
to generate discrete variables and it is tested in a non-controlled environment. In order
to achieve the goal, the core of the algorithm Ameva is used to develop an innovative
selection, discretization and classification technique for activity recognition. Moreover,
with the purpose of reducing the cost and increasing user acceptance and usability, the
entire system uses only a smartphone to recover all the information requiredMinisterio de Econom铆a y Competitividad HERMES TIN2013-46801-C4-1-rJunta de Andaluc铆a Simon P11-TIC-8052Junta de Andaluc铆a M-Learning P11-TIC-712
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Major requirements for building Smart Homes in Smart Cities based on Internet of Things technologies
The recent boom in the Internet of Things (IoT) will turn Smart Cities and Smart Homes (SH) from hype to reality. SH is the major building block for Smart Cities and have long been a dream for decades, hobbyists in the late 1970s made Home Automation (HA) possible when personal computers started invading home spaces. While SH can share most of the IoT technologies, there are unique characteristics that make SH special. From the result of a recent research survey on SH and IoT technologies, this paper defines the major requirements for building SH. Seven unique requirement recommendations are defined and classified according to the specific quality of the SH building blocks
Desarrollo y versatilidad del algoritmo de discretizaci贸n Ameva.
Esta tesis presentada como un compendio de art铆culos, analiza el problema de reconocimiento de actividades y detecci贸n de ca铆das en dispositivos m贸viles donde el consumo de bater铆a y la precisi贸n del sistema son las principales 谩reas de investigaci贸n. Estos problemas se abordan mediante el establecimiento de un nuevo algoritmo de selecci贸n, discretizaci贸n y clasificaci贸n basado en el n煤cleo del algoritmo Ameva. Gracias al proceso de discretizaci贸n, se obtiene un sistema eficiente en t茅rminos de energ铆a y precisi贸n. El nuevo algoritmo de reconocimiento de actividad ha sido dise帽ado para ejecutarse en dispositivos m贸viles y smartphones, donde el consumo de energ铆a es la caracter铆stica m谩s importante a tener en cuenta. Adem谩s, el algoritmo es eficiente en t茅rminos de precisi贸n dando un resultado en tiempo real. Estas caracter铆sticas se probaron tanto en una amplia gama de dispositivos m贸viles utilizando diferentes datasets del estado del arte en reconocimiento de actividades as铆 como en escenarios reales como la competici贸n EvAAL donde personas no relacionadas con el equipo de investigaci贸n llevaron un smartphone con el sistema desarrollado. En general, ha sido posible lograr un equilibrio entre la precisi贸n y el consumo de energ铆a. El algoritmo desarrollado se present贸 en el track de reconocimiento de actividades de la competici贸n EvAAL (Evaluation of Ambient Assisted Living Systems through Competitive Benchmarking), que tiene como objetivo principal la medici贸n del rendimiento de hardware y software. El sistema fue capaz de detectar las actividades a
trav茅s del conjunto establecido de puntos de referencia y m茅tricas de evaluaci贸n. Se desarroll贸 para varias clases de actividades y obtiene una gran precisi贸n cuando hay aproximadamente el dataset est谩 balanceado en cuanto al n煤mero de ejemplos para cada clase durante la fase de entrenamiento. La soluci贸n logr贸 el primer premio en la edici贸n de 2012 y el tercer premio en la edici贸n de 2013.This thesis, presented as a set of research papers, studies the problem of activity recognition and fall detection in mobile systems where the battery draining and the
accuracy are the main areas of researching. These problems are tackled through the
establishment of a new selection, discretization and classification algorithm based on the core of the algorithm Ameva. Thanks to the discretization process, it allows to get an efficient system in terms of energy and accuracy.
The new activity recognition algorithm has been designed to be run in mobile
systems, smartphones, where the energy consumption is the most important feature to take into account. Also, the algorithm had to be efficient in terms of accuracy giving an output in real time. These features were tested both in a wide range of mobile devices by applying usage data from recognized databases and in some real scenarios like the EvAAL competition where non-related people carried a smartphone with the developed system. In general, it had therefore been possible to achieve a trade-off between accuracy and energy consumption. The developed algorithm was presented in the Activity Recognition track of the competition EvAAL (Evaluation of Ambient Assisted Living Systems through Competitive Benchmarking), which has as main objective the measurement of hardware and software performance. The system was capable of detecting some activities through the established set of benchmarks and evaluation metrics. It has been developed for multi-class datasets and obtains a good accuracy when there is approximately the same number of examples for each class during the training phase. The solution achieved the first award in 2012 competition and the third award in 2013
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