3,912 research outputs found
Predicting Destinations by Nearest Neighbor Search on Training Vessel Routes
The DEBS Grand Challenge 2018 is set in the context of maritime route
prediction. Vessel routes are modeled as streams of Automatic Identification
System (AIS) data points selected from real-world tracking data. The challenge
requires to correctly estimate the destination ports and arrival times of
vessel trips, as early as possible. Our proposed solution partitions the
training vessel routes by reported destination port and uses a nearest neighbor
search to find the training routes that are closer to the query AIS point.
Particular improvements have been included as well, such as a way to avoid
changing the predicted ports frequently within one query route and automating
the parameters tuning by the use of a genetic algorithm. This leads to
significant improvements on the final score
Exploiting the open clusters in the Kepler and CoRoT fields
The open clusters in the Kepler and CoRoT fields potentially provide tight
constraints for tests of stellar models and observational methods because they
allow a combination of complementary methods. We are in the process of identi-
fying and measuring parameters for detached eclipsing binaries (dEBs) in the
open clusters in the Kepler and CoRoT fields. We make use of measurements of
dEBs in the clusters to test the accuracy of asteroseismic scaling relations
for mass. We are able to provide strong indications that the asteroseismic
scaling relations over- estimate the stellar mass, but we are not yet able to
distinguish between different proposed corrections from the literature. We
argue how our ongoing measurements of more dEBs in more clusters, complemented
by dEBs in the field, should be able to break the degeneracy. We also briefly
describe how we can identify cluster stars that have evolved through
non-standard evolution by making use of ensemble asteroseismology.Comment: Proc. of the workshop "Asteroseismology of stellar populations in the
Milky Way" (Sesto, 22-26 July 2013), Astrophysics and Space Science
Proceedings, (eds. A. Miglio, L. Girardi, P. Eggenberger, J. Montalban
Contemporary Social Historical Perspectives on Mental Health Reform
The argument presented in this article is that a new role has been developing in law which can and should be used as a strategy in the provision of services. It will be further argued that there is an important place for the law in setting limits on established psychiatric measures relating, for example, to compulsory admission and treatment, and even to particularly hazardous measures taken with the consent of the patient. The final role of law is to ensure the civil status of those who are the consumers of psychiatric services. One must accept the fact that pernicious legal and social consequences sometimes are secondary features of the receipt of psychiatric services. Here the law can make a distinctive contribution to uphold a person\u27s personal status and dignity. This approach does not pretend to offer a solution to the more collective problems relating to deficiency in services, but the more individualistic approach of the law has its own legitimacy in upholding the integrity of people who have felt dehumanized by institutions, by the opprobrium of society and by the discriminatory character of legislation
Montessori Education and a Neighborhood School: A Case Study of Two Early Childhood Education Classrooms
Project SYNC (Systems, Yoked through Nuanced Collaboration) details perspectives of a community of stakeholders committed to the enhancement of early childhood (i.e., prekindergarten through grade 3) education. Although there is a growing number of public-school programs informed by the Montessori philosophy, Montessori educational experiences often take place within affluent communities. SYNC aimed to enhance the prekindergarten through grade 3 educational experiences for traditionally underserved students by transforming two traditional early childhood classrooms to Montessori settings within a diverse, Title I school. Montessori pedagogy, curricula, and materials aligned with the school’s dedicated commitment to social justice. The study, one in a series, explored the impact of Montessori education on a neighborhood school community as evidenced through stakeholder opinions, project implementation, and teacher attitudes. Project data illustrate that a Montessori educational experience created learning opportunities that supported children from culturally and ethnically diverse communities in a traditional, Title I elementary school
Precision atomic gravimeter based on Bragg diffraction
We present a precision gravimeter based on coherent Bragg diffraction of
freely falling cold atoms. Traditionally, atomic gravimeters have used
stimulated Raman transitions to separate clouds in momentum space by driving
transitions between two internal atomic states. Bragg interferometers utilize
only a single internal state, and can therefore be less susceptible to
environmental perturbations. Here we show that atoms extracted from a
magneto-optical trap using an accelerating optical lattice are a suitable
source for a Bragg atom interferometer, allowing efficient beamsplitting and
subsequent separation of momentum states for detection. Despite the inherently
multi-state nature of atom diffraction, we are able to build a Mach-Zehnder
interferometer using Bragg scattering which achieves a sensitivity to the
gravitational acceleration of with an
integration time of 1000s. The device can also be converted to a gravity
gradiometer by a simple modification of the light pulse sequence.Comment: 13 pages, 11 figure
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