نتایج جستجو برای: aor
تعداد نتایج: 7130 فیلتر نتایج به سال:
We consider a class of matrices that are of interest to numerical applications and are large, sparse, but not symmetric or diagonally dominant. We give a criterion for the existence of (and we actually construct) the inverse matrix in terms of powers of a "small" matrix. We use this criterion to find that the spectral radius of the Jacobi iteration matrix, corresponding to a block tridiagonal p...
We present a UML profile for an agent-oriented modeling approach called Agent-Object-Relationship (AOR) modeling, where an entity is either an agent, an event, an action, a claim, a commitment, or an ordinary object, and where special relationships between agents and events, actions, claims and commitments supplement the fundamental association, aggregation/composition and generalization relati...
روشهای تکراری در کنار روشهای مستقیم بوجود آمده اند و در مقایسه با آنها برای حل بسیاری از مسائل ریاضیات کاربردی و مسائل مشابه کاربرد وسیع تر و کاراتری دارند. از روشهای تکراری معروف می توان به روشهای ژاکوبی، گوس - سایدل و sor اشاره کرد که کاربردهای فراوانی در علوم و مهندسی دارند. روش ارائه شده در این پایان نامه یک تعمیم دوپارامتری از روش sor، موسوم به aor می باشد و در عمل نشان داده که از دیگر روش...
Factors associated with alcohol, tobacco and illicit drug use among Brazilian undergraduate students
ABSTRACT Objectives: to analyze the factors associated with use of alcohol, tobacco and illicit drugs among Brazilian undergraduate students. Methods: observational, cross-sectional study, convenience sampling, conducted in 2014/2015, involving institutional data a self-completed online questionnaire, analyzed using measures frequency, central tendency/dispersion logistic regression. Results: 1...
OBJECTIVES To estimate the prevalence of youth who use cannabis but have never been tobacco smokers and to assess the characteristics that differentiate them from those using both substances or neither substance. DESIGN School survey. SETTING Postmandatory schools. PARTICIPANTS A total of 5263 students (2439 females) aged 16 to 20 years divided into cannabis-only smokers (n = 455), cannab...
OBJECTIVE This study examined associations between the family environment and children's television (TV) viewing and likelihood of being low-active. RESEARCH METHODS AND PROCEDURES In 2001, children were recruited from 19 primary schools in Melbourne, Australia. Parents completed a questionnaire about their child's TV viewing and the family environment. Children also completed a questionnaire...
BACKGROUND Data on risk factors for influenza-associated hospitalizations in low- and middle-income countries are limited. METHODS We conducted active syndromic surveillance for hospitalized severe acute respiratory illness (SARI) and outpatient influenza-like illness (ILI) in 2 provinces of South Africa during 2012-2015. We compared the characteristics of influenza-positive patients with SAR...
Results: The percentage of persons with activity limitation was 12.1% of men and 15.6% of women. For men, low body mass index (BMI) (AOR: 2.02, p=0.008), high blood pressure (AOR: 1.53, p=0.021), high hemoglobin A1c (HbA1c) (AOR: 1.99, p=0.000), a small number of steps (AOR: 1.68, p=0.002), and high intake of salt (AOR: 0.69, p=0.010) were significantly associated with limitation of activity. F...
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