1,320 research outputs found
A Survey of Clock Synchronization Over Packet-Switched Networks
Clock synchronization is a prerequisite for the realization of emerging applications in various domains such as industrial automation and the intelligent power grid. This paper surveys the standardized protocols and technologies for providing synchronization of devices connected by packet-switched networks. A review of synchronization impairments and the state-of-the-art mechanisms to improve the synchronization accuracy is then presented. Providing microsecond to sub-microsecond synchronization accuracy under the presence of asymmetric delays in a cost-effective manner is a challenging problem, and still an open issue in many application scenarios. Further, security is of significant importance for systems where timing is critical. The security threats and solutions to protect exchanged synchronization messages are also discussed
Persistence of Problematic Sexual Behaviors in Children
The purpose of this study was to identify personal and family predictors and correlates of persistence of problematic sexual behaviors (PSB) in children. Participants were the families of 49 children (ages 4–11 years) referred by Child Protective Services in 4 administrative districts of Quebec. Caregivers completed interviews and questionnaires twice at a 1-year interval. Results showed that 43% of children persisted with PSB. When age was controlled, greater exposure to sexualized behaviors in the family proved both a correlate and a predictor of PSB persistence in children 12 months later.\ud
Externalizing problems and somatic complaints emerged as correlates of PSB as well. Maltreatment subtypes did not predict PSB persistence
Verb Production in Semantic Dementia: Impact of Semantic Memory Impairment on Derivational Morphology
Perceived community environment and physical activity involvement in a northern-rural Aboriginal community
This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens
Quantum Information Approach to the Implementation of a Neutron Cavity
Using the quantum information model of dynamical diffraction we consider a
neutron cavity composed of two perfect crystal silicon blades capable of
containing the neutron wavefunction. We show that the internal confinement of
the neutrons through Bragg diffraction can be modelled by a quantum random
walk. Good agreement is found between the simulation and the experimental
implementation. Analysis of the standing neutron waves is presented in regards
to the crystal geometry and parameters; and the conditions required for
well-defined bounces are derived. The presented results enable new approaches
to studying the setups utilizing neutron confinement, such as the experiments
to measure neutron magnetic and electric dipole moments.Comment: 6 pages, 5 figure
Novel Evidence That the Mannan-Binding Lectin Pathway of Complement Activation Plays a Pivotal Role in Triggering Mobilization of Hematopoietic Stem/Progenitor Cells by Activation of Both the Complement and Coagulation Cascades
- …