11,317 research outputs found
A Data Fusion System to Study Synchronization in Social Activities
As the world population gets older, the healthcare system must be adapted,
among others by providing continuous health monitoring at home and in the city.
The social activities have a significant role in everyone health status. Hence,
this paper proposes a system to perform a data fusion of signals sampled on
several subjects during social activities. This study implies the time
synchronization of data coming from several sensors whether these are embedded
on people or integrated in the environment. The data fusion is applied to
several experiments including physical, cognitive and rest activities, with
social aspects. The simultaneous and continuous analysis of four subjects
cardiac activity and GPS coordinates provides a new way to distinguish
different collaborative activities comparing the measurements between the
subjects and along time.Comment: Healthcom 201
Modular design of data-parallel graph algorithms
Amorphous Data Parallelism has proven to be a suitable vehicle for implementing concurrent graph algorithms effectively on multi-core architectures. In view of the growing complexity of graph algorithms for information analysis, there is a need to facilitate modular design techniques in the context of Amorphous Data Parallelism. In this paper, we investigate what it takes to formulate algorithms possessing Amorphous Data Parallelism in a modular fashion enabling a large degree of code re-use. Using the betweenness centrality algorithm, a widely popular algorithm in the analysis of social networks, we demonstrate that a single optimisation technique can suffice to enable a modular programming style without loosing the efficiency of a tailor-made monolithic implementation
Modeling the lowest-cost splitting of a herd of cows by optimizing a cost function
Animals live in groups to defend against predation and to obtain food.
However, for some animals --- especially ones that spend long periods of time
feeding --- there are costs if a group chooses to move on before their
nutritional needs are satisfied. If the conflict between feeding and keeping up
with a group becomes too large, it may be advantageous to some animals to split
into subgroups of animals with similar nutritional needs. We model the costs
and benefits of splitting by a herd of cows using a cost function (CF) that
quantifies individual variation in hunger, desire to lie down, and predation
risk. We model the costs associated with hunger and lying desire as the
standard deviations of individuals within a group, and we model predation risk
as an inverse exponential function of group size. We minimize the cost function
over all plausible groups that can arise from a given herd and study the
dynamics of group splitting. We explore our model using two examples: (1) we
consider group switching and group fission in a herd of relatively homogeneous
cows; and (2) we examine a herd with an equal number of adult males (larger
animals) and adult females (smaller animals).Comment: 19 pages, 10 figure
Installing, Configuring and Implementing an SMF in Joomla
This paper’s goal is to show how an asynchronous communication component which can also be used in teaching activities was installed, configured and implemented on the website of the Department of Accounting and Economic Informatics of the Economics Faculty within the Dunarea de Jos University in Galati. This component is known under the name of forum or discussion board.Web 2.0, forum, CMS
A Mathematical Model for the Dynamics and Synchronization of Cows
We formulate a mathematical model for daily activities of a cow (eating,
lying down, and standing) in terms of a piecewise affine dynamical system. We
analyze the properties of this bovine dynamical system representing the single
animal and develop an exact integrative form as a discrete-time mapping. We
then couple multiple cow "oscillators" together to study synchrony and
cooperation in cattle herds. We comment on the relevant biology and discuss
extensions of our model. With this abstract approach, we not only investigate
equations with interesting dynamics but also develop interesting biological
predictions. In particular, our model illustrates that it is possible for cows
to synchronize \emph{less} when the coupling is increased.Comment: to appear in Physica
Recommended from our members
The role of HG in the analysis of temporal iteration and interaural correlation
- …