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Search Results: 1 - 10 of 4659 matches for " FR McMorris "
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Constructing majority-rule supertrees
Jianrong Dong, David Fernández-Baca, FR McMorris
Algorithms for Molecular Biology , 2010, DOI: 10.1186/1748-7188-5-2
Abstract: We study a variant of one of Cotton and Wilkinson's methods, called majority-rule (+) supertrees. After proving that a key underlying problem for constructing majority-rule (+) supertrees is NP-hard, we develop a polynomial-size exact integer linear programming formulation of the problem. We then present a data reduction heuristic that identifies smaller subproblems that can be solved independently. While this technique is not guaranteed to produce optimal solutions, it can achieve substantial problem-size reduction. Finally, we report on a computational study of our approach on various real data sets, including the 121-taxon, 7-tree Seabirds data set of Kennedy and Page.The results indicate that our exact method is computationally feasible for moderately large inputs. For larger inputs, our data reduction heuristic makes it feasible to tackle problems that are well beyond the range of the basic integer programming approach. Comparisons between the results obtained by our heuristic and exact solutions indicate that the heuristic produces good answers. Our results also suggest that the majority-rule (+) approach, in both its basic form and with data reduction, yields biologically meaningful phylogenies.A supertree method begins with a collection of phylogenetic trees with possibly different leaf (taxon) sets, and assembles them into a larger phylogenetic tree, a supertree, whose taxon set is the union of the taxon sets of the input trees. Interest in supertrees was sparked by Gordon's paper [1]. Since then, particularly during the past decade, there has been a flurry of activity with many supertree methods proposed and studied from the algorithmic, theoretical, and biological points of view. The appeal of supertree synthesis is that it can combine disparate data to provide a high-level perspective that is harder to attain from individual trees. A recent example of the use of this approach is the species-level phylogeny of nearly all extant Mammalia constructed by Bin
Automatization and Retention of Literacy Skills in Adult Learners
James M Bebko,Thomas Rhee,Carly McMorris,Magali Segers
Literacy and Numeracy Studies , 2012,
Abstract: Findings from recent efficacy studies comparing literacy program types suggest that struggling adult readers often make limited to moderate gains across varied types of literacy interventions, with no specific approach consistently surpassing others to date. An alternative to comparing program types is to investigate whether there are specific characteristics or skills that vary by individual that can predict higher gains and skill retention across program type. Using an experimental, prospective, longitudinal design, the present study examined the role of automatization (over-learning) of component skills involved in reading during participation in general literacy programs. On average, participants in the study gained the equivalent of one full reading grade-level after participation in programs for six months. The degree of automatization of reading skills was found to be the strongest predictor of gains made during programs; a measure of automatization was also the strongest predictor of subsequent retention of skills, months later at follow-up testing. Implications for adult literacy practitioners and directions for future research related to skill retention are discussed.
Youth report of healthcare transition counseling and autonomy support from their rheumatologist
Wells Courtney Kellerman,McMorris Barbara J,Horvath Keith J,Garwick Ann W
Pediatric Rheumatology , 2012, DOI: 10.1186/1546-0096-10-36
Abstract: Background To increase understanding of the healthcare transition (HCT) process for young people living with Juvenile Idopathic Arthritis (JIA) by examining: 1) the extent to which youth report discussing HCT topics with their rheumatologist and 2) the association between youth perceptions of autonomy support from their rheumatologist and HCT discussions. Methods Data are from an online survey of youth in the United States with rheumatologic conditions (n= 134). HCT discussion was measured by 4 questions from the National Survey of Children with Special Health Care Needs. Youth perception of autonomy support was measured using a validated 6-item scale. Results One third of the youth (33.7%) reported talking to their rheumatologist about transferring to adult medicine. Less than half (40.8%) of respondents talked with their rheumatologist about adult healthcare needs, and less than a quarter (22.0%) discussed acquiring health insurance as an adult. Nearly two-thirds of respondents (62.7%) reported that their rheumatologist usually/always encourages self-care responsibility. Multivariate analyses revealed significant associations between rheumatologist support for youth autonomy and HCT counseling. Conclusion The low frequency of HCT counseling reported indicates a continuing need to increase awareness among rheumatologist in the USA. The strong associations between rheumatologist’s support for youth autonomy and HCT counseling suggest that developmentally “in-tune” providers may deliver the best guidance about transition planning for youth living with arthritis.
Contribution of Physical Fitness, Cerebrovascular Reserve and Cognitive Stimulation to Cognitive Function in Post-Menopausal Women
Gail A. Eskes,Stewart Longman,Allison D. Brown,Carly A. McMorris,Kristopher D. Langdon,David B. Hogan,Marc Poulin
Frontiers in Aging Neuroscience , 2010, DOI: 10.3389/fnagi.2010.00137
Abstract: Studies of the effects of physical fitness on cognition suggest that exercise can improve cognitive abilities in healthy older adults, as well as delay the onset of age-related cognitive decline. The mechanisms for the positive benefit of exercise and how these effects interact with other variables known to influence cognitive function (e.g., involvement in cognitive activities) are less well understood. The current study examined the associations between the physical fitness, cerebrovascular blood flow regulation and involvement in cognitive activities with neuropsychological function in healthy post-menopausal women. Methods: Forty-two healthy women between the ages of 55 and 90 were recruited. Physical fitness ( max), cerebrovascular reserve (cerebral blood flow during rest and response to an increase in end-tidal (i.e., arterial) PCO2), and cognitive activity (self-reported number and hours of involvement in cognitive activities) were assessed. The association of these variables with neuropsychological performance was examined through linear regression. Results: Physical fitness, cerebrovascular reserve and total number of cognitive activities (but not total hours) were independent predictors of cognitive function, particularly measures of overall cognitive performance, attention and executive function. In addition, prediction of neuropsychological performance was better with multiple variables than each alone. Conclusions: Cognitive function in older adults is associated with multiple factors, including physical fitness, cerebrovascular health and cognitive stimulation. Interestingly, cognitive stimulation effects appear related more to the diversity of activities, rather than the duration of activity. Further examination of these relationships is ongoing in a prospective cohort study.
Various Perspectives on Performance Appraisals in the Health Service  [PDF]
Fr?ydis Vasset
Health (Health) , 2014, DOI: 10.4236/health.2014.610117
Abstract: Background: The health services are facing many new challenges, including a growing number of elderly patients, and an increasing use of technology in the work place. These challenges might require flexible and reflective conversations with the employees. Aim: This study examines whether some performance appraisals (PAs) are more efficient and more effective than others. The study also shows how some performance appraisals are more suitable for home care and nursing homes in municipal health services. Methods: Two datasets are used: 1) a questionnaire was distributed to a representative sample of 600 health personnel in Norway; and 2) a questionnaire was distributed to a representative sample of 60 employees (test-group: 10 groups; control-group: 30 employees), in pre-test, post-test 1 and post-test 2. SPSS. Findings: Managers are the only ones who receive training in PA techniques (factory perspective). Nurses versus auxiliary nurses experience more frequent dyadic relationships and exchanges in PAs (family perspective). PAs for employees from nursing homes are fairer than those administered to home care employees (jungle perspective). In organizations closest to carnival perspectives, employees participating in group-PAs are more active in the conversations than employees who have individual conversations in PAs. Conclusions: Health personnel involved in PAs experience different effects of the conversational, and employees working as a member of a team in the organization need to experience a high quality of relationships (family), justice (jungle), and participation in group-conversation (carnival) during performance appraisals.
Corrective mating methods in context of breeding theory
FR Allaire
Genetics Selection Evolution , 1978, DOI: 10.1186/1297-9686-10-4-596a
Abstract:
Morphology of immature stages in the neotropical nonfrugivorous Tephritinae Fruit Fly Species Rachiptera limbata Bigot (Diptera: Tephritidae) on Baccharis linearis (R. et Pav.) (Asteraceae)
Frías, Daniel;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000500006
Abstract: rachiptera limbata bigot develops on baccharis linearis (r. et pav.) in the areas around santiago, chile. the larvae feed on stem tissues and secrete a liquid that hardens to form a protective feeding and pupation chamber. the immature stages of neotropical species of tephritinae are poorly known. in this paper, the morphology of the immature stages of r. limbata are described and compared, in a phylogenetic context, with other tephritinae species. antennomaxillary complex, pads, oral ridge, cephalopharyngeal skeleton, anterior and posterior spiracles and anal lobes of first-, second-, third-instar larvae and pupae were studied with optical and scanning electron microscopy. the cephalopharyngeal skeleton is darkly sclerotized and shows an opening or window in the ventral cornua. this trait seems to be plesiomorphic in r. limbata and in other neotropical species. first-instar larvae anterior spiracles are absent; whereas in second and third instars spiracles are developed as a row of five short tubules. in first- and second-instar larvae, the posterior spiracular slit has only a single hair per bundle; whereas third-instar larvae lack hairs. this last trait seems to be consequence of a larval development delay and an apomorphic trait in r. limbata, compared to other neotropical and neartical species.
Els serveis personalitzats d'informació d'actualitat dels mitjans de comunicació espanyols per Internet
Frías, Amparo
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2006,
Abstract: L'objectiu de l'article és presentar un mapa aprofundit dels serveis personalitzats d'informació d'actualitat que els mitjans de comunicació espanyols ofereixen als usuaris per mitjà d'Internet. També s'assenyalen els serveis personalitzats que han estat creats tenint en compte les necessitats informatives dels receptors del servei, i que permeten la creació de perfils d'usuari en què la interacció d'aquest resulta imprescindible per aconseguir un servei d'acord amb els interessos informatius del receptor. El treball de camp portat a terme descriu els actors de la difusió de la informació d'actualitat a Espanya a la xarxa, i també presenta gràfics i taules que revelen l'estat de la qüestió de la tipologia de serveis oferts.The objective of this article is to provide an in-depth map of the personalised current awareness services (SP) offered by the Spanish mass media to their users, over the Internet. Likewise, there is a description of SPs created to meet the information needs of those using the system through the creation of user profiles which are a very important tool for achieving a service that matches the interests of those receiving the service. The field work carried out describes the main actors in the dissemination of Spanish current awareness services over the network, as well as presenting graphs and tables that reveal the current state of the art of this type of service.
Los servicios personalizados de información de actualidad de los medios de comunicación espa oles a través de Internet
Frías, Amparo
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2006,
Abstract: El objetivo del artículo es presentar un mapa en profundidad de los servicios personalizados de información de actualidad que los medios de comunicación espa oles ofrecen a los usuarios a través de Internet. Asimismo, se ponen de manifiesto aquellos servicios personalizados que han sido creados teniendo en cuenta las necesidades informativas de los receptores del servicio, que permiten la creación de perfiles de usuario donde la interacción de éste resulta imprescindible para conseguir un servicio de acuerdo con los intereses informativos del receptor. El trabajo de campo llevado a cabo, describe a los actores de la difusión de la información de actualidad en Espa a a través de la red, así como también presenta gráficos y las tablas que revelan, el estado del arte de esta tipología de servicios.The objective of this article is to provide an in-depth map of the personalised current awareness services (SP) offered by the Spanish mass media to their users, over the Internet. Likewise, there is a description of SPs created to meet the information needs of those using the system through the creation of user profiles which are a very important tool for achieving a service that matches the interests of those receiving the service. The field work carried out describes the main actors in the dissemination of Spanish current awareness services over the network, as well as presenting graphs and tables that reveal the current state of the art of this type of service.
Book Review - Inova o Estratégias e Comunidades de Conhecimento
Edimeri Frá
Revista de Administra??o Contemporanea , 2011,
Abstract:
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