59 research outputs found
Testing the Structure of a Gaussian Graphical Model with Reduced Transmissions in a Distributed Setting
Testing a covariance matrix following a Gaussian graphical model (GGM) is
considered in this paper based on observations made at a set of distributed
sensors grouped into clusters. Ordered transmissions are proposed to achieve
the same Bayes risk as the optimum centralized energy unconstrained approach
but with fewer transmissions and a completely distributed approach. In this
approach, we represent the Bayes optimum test statistic as a sum of local test
statistics which can be calculated by only utilizing the observations available
at one cluster. We select one sensor to be the cluster head (CH) to collect and
summarize the observed data in each cluster and intercluster communications are
assumed to be inexpensive. The CHs with more informative observations transmit
their data to the fusion center (FC) first. By halting before all transmissions
have taken place, transmissions can be saved without performance loss. It is
shown that this ordering approach can guarantee a lower bound on the average
number of transmissions saved for any given GGM and the lower bound can
approach approximately half the number of clusters when the minimum eigenvalue
of the covariance matrix under the alternative hypothesis in each cluster
becomes sufficiently large
Teaching and learning intuition: Some implications for HRD and coaching practice
Purpose: examine conceptual and theoretical links between intuition and coaching; investigate accomplished coachesâ practical experiences of intuition; identify skill set of an intuitive coach; discuss implications of findings for coachesâ, HRD professionals and line managersâ learning and development.
Method and Sample: in-depth, semi-structured, individual interviews with 14 accomplished experienced executive coaches (eight males and six females) averaging 14.5 years as a coach.
Findings: outline of core attributes of an intuitive coach.
Implications: immersion in experience, a reflective approach to practice, effective feedback and supervision, and attending to personal well-being are likely to enable coaches, HRD practitioners and line managers to take a more informed and intelligent approach to âgoing with their gutâ in coaching situations
Prevalence of Infection-Competent Serogroup 6 \u3cem\u3eLegionella pneumophila\u3c/em\u3e within Premise Plumbing in Southeast Michigan
Coinciding with major changes to its municipal water system, Flint, MI, endured Legionnairesâ disease outbreaks in 2014 and 2015. By sampling premise plumbing in Flint in the fall of 2016, we found that 12% of homes harbored legionellae, a frequency similar to that in residences in neighboring areas. To evaluate the genetic diversity of Legionella pneumophila in Southeast Michigan, we determined the sequence type (ST) and serogroup (SG) of the 18 residential isolates from Flint and Detroit, MI, and the 33 clinical isolates submitted by hospitals in three area counties in 2013 to 2016. Common to one environmental and four clinical samples were strains of L. pneumophila SG1 and ST1, the most prevalent ST worldwide. Among the Flint premise plumbing isolates, 14 of 16 strains were of ST367 and ST461, two closely related SG6 strain types isolated previously from patients and corresponding environmental samples. Each of the representative SG1 clinical strains and SG6 environmental isolates from Southeast Michigan infected and survived within macrophage cultures at least as well as a virulent laboratory strain, as judged by microscopy and by enumerating CFU. Likewise, 72 h after infection, the yield of viable-cell counts increased \u3e 100-fold for each of the representative SG1 clinical isolates, Flint premise plumbing SG6 ST367 and -461 isolates, and two Detroit residential isolates. We verified by immunostaining that SG1-specific antibody does not cross-react with the SG6 L. pneumophila environmental strains. Because the widely used urinary antigen diagnostic test does not readily detect non-SG1 L. pneumophila, Legionnairesâ disease caused by SG6 L. pneumophila is likely underreported worldwide
Preliminary archaeoentomological analyses of permafrost-preserved cultural layers from the pre-contact Yupâik Eskimo site of Nunalleq, Alaska : implications, potential and methodological considerations
Acknowledgements Site excavation and samples collection were conducted by archaeologists from the University of Aberdeen, with the help of archaeologists and student excavators from the University of Aberdeen University of Alaska Fairbanks and Bryn Mawr College, Kuskokwim Campus, College of Rural Alaska and residents of Quinhagak and Mekoryuk. This study is funded through AHRC grant to the project âUnderstanding Cultural Resilience and Climate Change on the Bering Sea through Yupâik Ecological Knowledge, Lifeways, Learning and Archaeologyâ to Rick Knecht, Kate Britton and Charlotta Hillderal (University of Aberdeen; AH/K006029/1). Thanks are due to Qanirtuuq Inc. and Quinhagak, Alaska for sampling permissions and to entomologists working at the CNC in Ottawa for allowing access to reference collections of beetles, lice and fleas. Yves Bousquet, Ales Smetana and Anthony E. Davies are specially acknowledged for their help with the identification of coleopteran specimens. Finally, we would also like to thank Scott Elias for useful comments on the original manuscript.Peer reviewedPublisher PD
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