197,875 research outputs found
Selección de características relevantes usando información mutua
No full textUn nuevo método para la selección de atributos relevantes basado en Información Mutua es
presentado. Este se basa en el concepto de probabilidad de relevancia de cada atributo, el cual es medido a
través de una prueba de permutación, y permite descartar variables irrelevantes así como ordenar por
importancia aquellas relevantes. La metodología propuesta es probada usando tres problemas de clasificación
bien conocidos. Igualmente, se realiza una investigación con miras a esclarecer su robustez cuando las
variables relevantes están contaminadas con ruido, o existen variables aleatorias artificiales irrelevantes. Los
resultados indican las bondades de la metodología propuesta, por lo que se sugiere que ella debe ser una
parte integral de las herramientas usadas en la selección de características relevantes
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Exclusión mutua para coordinación de sistemas distribuidos
No full textEl problema de exclusión mutua se basa en el acceso a un único e indivisible recurso.
Con el auge de los sistemas distribuidos esta problemática se convirtió en una necesidad en diferentes tipos de aplicaciones. Los algoritmos para soportar exclusión mutua en ambientes distribuidos se clasifican en: pasajes de mensajes y datos compartidos (memoria compartida distribuida). El trabajo se basa en algoritmos distribuidos de memoria compartida asincrónica. A partir del algoritmo de Tournament se desarrolla un protocolo de simple escritura y múltiple lectura.
Obteniendo ventajas en el diseño e implementación del mismo, ya que es mucho más costoso el acceso a variables compartidas de múltiple escritura que a variables compartidas de simple escritura.Eje: Programación concurrenteRed de Universidades con Carreras en Informática (RedUNCI
Exclusión mutua para coordinación de sistemas distribuidos
No full textEl problema de exclusión mutua se basa en el acceso a un único e indivisible recurso.
Con el auge de los sistemas distribuidos esta problemática se convirtió en una necesidad en diferentes tipos de aplicaciones. Los algoritmos para soportar exclusión mutua en ambientes distribuidos se clasifican en: pasajes de mensajes y datos compartidos (memoria compartida distribuida). El trabajo se basa en algoritmos distribuidos de memoria compartida asincrónica. A partir del algoritmo de Tournament se desarrolla un protocolo de simple escritura y múltiple lectura.
Obteniendo ventajas en el diseño e implementación del mismo, ya que es mucho más costoso el acceso a variables compartidas de múltiple escritura que a variables compartidas de simple escritura.Eje: Programación concurrenteRed de Universidades con Carreras en Informática (RedUNCI
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Exclusión mutua para grupos de procesos utilizando un actor
No full textLas aplicaciones distribuidas están formadas por un conjunto de procesos, los cuales pueden competir por utilizar un recurso o trabajar en forma conjunta para resolver una tarea. Estas aplicaciones requieren protocolos que permitan concurrencia entre los procesos que trabajan cooperativamente y exclusión mutua para aquellos que compiten por utilizar el recurso. En este trabajo se presenta un algoritmo para exclusión mutua para grupos de procesos basándose en el modelo de memoria compartida asincrónica, donde cada conjunto de procesos que realice una actividad conjunta compiten conjuntamente para acceder al recurso.VIII Workshop de Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Exclusión mutua para grupos de procesos utilizando un actor
No full textLas aplicaciones distribuidas están formadas por un conjunto de procesos, los cuales pueden competir por utilizar un recurso o trabajar en forma conjunta para resolver una tarea. Estas aplicaciones requieren protocolos que permitan concurrencia entre los procesos que trabajan cooperativamente y exclusión mutua para aquellos que compiten por utilizar el recurso. En este trabajo se presenta un algoritmo para exclusión mutua para grupos de procesos basándose en el modelo de memoria compartida asincrónica, donde cada conjunto de procesos que realice una actividad conjunta compiten conjuntamente para acceder al recurso.VIII Workshop de Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI
Calcium channel blockers for people with chronic kidney disease requiring dialysis
No full textBackground: Calcium channel blockers (CCBs) are used to manage hypertension which is highly prevalent among people with chronic kidney disease (CKD). The treatment for hypertension is particularly challenging in people undergoing dialysis. Objectives: To assess the benefits and harms of calcium channel blockers in patients with chronic kidney disease requiring dialysis. Search methods: We searched the Cochrane Kidney and Transplant Register of Studies to 27 April 2020 through contact with the Information Specialist using search terms relevant to this review. Studies in the Specialised Register are identified through searches of CENTRAL, MEDLINE, and EMBASE, conference proceedings, the International Clinical Trials Register (ICTRP) Search Portal and ClinicalTrials.gov. Selection criteria: All randomised controlled trials (RCTs) and quasi-RCTs that compared any type of CCB with other CCB, different doses of the same CCB, other antihypertensives, control or placebo were included. The minimum study duration was 12 weeks. Data collection and analysis: Two authors independently assessed study quality and extracted data. Statistical analyses were performed using a random-effects model and results expressed as risk ratio (RR), risk difference (RD) or mean difference (MD) with 95% confidence intervals (CI). Main results: This review included 13 studies (24 reports) randomising 1459 participants treated with long-term haemodialysis. Nine studies were included in the meta-analysis (622 participants). No studies were performed in children or in those undergoing peritoneal dialysis. Overall, risk of bias was assessed as unclear to high across most domains. Random sequence generation and allocation concealment were at low risk of bias in eight and one studies, respectively. Two studies reported low risk methods for blinding of participants and investigators, and outcome assessment was blinded in 10 studies. Three studies were at low risk of attrition bias, eight studies were at low risk of selective reporting bias, and five studies were at low risk of other potential sources of bias. Overall, the certainty of the evidence was low to very low for all outcomes. No events were reported for cardiovascular death in any of the comparisons. Other side effects were rarely reported and studies were not designed to measure costs. Five studies (451 randomised adults) compared dihydropyridine CCBs to placebo or no treatment. Dihydropyridine CCBs may decrease predialysis systolic (1 study, 39 participants: MD -27.00 mmHg, 95% CI -43.33 to -10.67; low certainty evidence) and diastolic blood pressure level (2 studies, 76 participants; MD -13.56 mmHg, 95% CI -19.65 to -7.48; I2 = 0%, low certainty evidence) compared to placebo or no treatment. Dihydropyridine CCBs may make little or no difference to occurrence of intradialytic hypotension (2 studies, 287 participants; RR 0.54, 95% CI 0.25 to 1.15; I2 = 0%, low certainty evidence) compared to placebo or no treatment. Other side effects were not reported. Eight studies (1037 randomised adults) compared dihydropyridine CCBs to other antihypertensives. Dihydropyridine CCBs may make little or no difference to predialysis systolic (4 studies, 180 participants: MD 2.44 mmHg, 95% CI -3.74 to 8.62; I2 = 0%, low certainty evidence) and diastolic blood pressure (4 studies, 180 participants: MD 1.49 mmHg, 95% CI -2.23 to 5.21; I2 = 0%, low certainty evidence) compared to other antihypertensives. There was no evidence of a difference in the occurrence of intradialytic hypotension (1 study, 92 participants: RR 2.88, 95% CI 0.12 to 68.79; very low certainty evidence) between dihydropyridine CCBs to other antihypertensives. Other side effects were not reported. Dihydropyridine CCB may make little or no difference to predialysis systolic (1 study, 40 participants: MD -4 mmHg, 95% CI -11.99 to 3.99; low certainty evidence) and diastolic blood pressure (1 study, 40 participants: MD -3.00 mmHg, 95% CI -7.06 to 1.06; low certainty evidence) compared to non-dihydropyridine CCB. There was no evidence of a difference in other side effects (1 study, 40 participants: RR 0.13, 95% CI 0.01 to 2.36; very low certainty evidence) between dihydropyridine CCB and non-dihydropyridine CCB. Intradialytic hypotension was not reported. Authors' conclusions: The benefits of CCBs over other antihypertensives on predialysis blood pressure levels and intradialytic hypotension among people with CKD who required haemodialysis were uncertain. Effects of CCBs on other side effects and cardiovascular death also remain uncertain. Dihydropyridine CCBs may decrease predialysis systolic and diastolic blood pressure level compared to placebo or no treatment. No studies were identified in children or peritoneal dialysis. Available studies have not been designed to measure the effects on costs. The shortcomings of the studies were that they recruited very few participants, had few events, had very short follow-up periods, some outcomes were not reported, and the reporting of outcomes such as changes in blood pressure was not done uniformly across studies. Well-designed RCTs, conducted in both adults and children with CKD requiring both haemodialysis and peritoneal dialysis, evaluating both dihydropyridine and non-dihydropyridine CCBs against other antihypertensives are required. Future research should be focused on outcomes relevant to patients (including death and cardiovascular disease), blood pressure changes, risk of side effects and healthcare costs to assist decision-making in clinical practice
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