background: human resources, especially medical staff is one of the main components of health care system and organizational development. the purpose of this study was to estimate the required nurses for hospitals affiliated to tehran university of medical sciences based on the models of the world health organization and levine. methods: this study was cross-sectional and descriptive. seven hos...

Current multisensor fusion tracking systems can be easily overwhelmed by incoming data, especially as the number of targets and sensors increases. Sensor management schemes have been proposed to reduce the computational demand of these systems while minimizing the loss of tracking performance. This paper presents a system that will maintain a desired covariance level for each target while reduc...

The Bieberbach estimate, a pivotal result in the classical theory of univalent functions, states that any injective holomorphic function f on the open unit disc D satisfies |f ′′(0)| ≤ 4|f ′(0)|. We generalize the Bieberbach estimate by proving a version of the inequality that applies to all injective smooth conformal immersions f : D → Rn, n ≥ 2. The new estimate involves two correction terms....

This study analyzes the relationship between arsenic exposure through drinking water and bladder cancer mortality. The county-specific white male bladder cancer mortality data (1950-1979) and county-specific groundwater arsenic concentration data were obtained for 133 U.S. counties known to be exclusively dependent on groundwater for their public drinking water supply. No arsenic-related increa...

Background Although chemotherapy is used routinely in pediatric medulloblastoma (MB) patients, its benefit for adult MB is unclear. We evaluated the survival impact of adjuvant chemotherapy in adult MB. Methods Using the National Cancer Data Base, we identified patients aged 18 years and older who were diagnosed with MB in 2004-2012 and underwent surgical resection and adjuvant craniospinal i...

OBJECTIVE This study attempted to compare two models for selective (people at elevated risk) and indicated (those with subsyndromal depressive symptoms) prevention and to determine the optimal strategy for prevention of late-life depression. METHOD Onset was assessed at 3 years with the Geriatric Mental State AGECAT in a randomly selected cohort of 1,940 nondepressed and nondemented older peo...

over the credibility of the randomized screening mammography trials are red herrings. The overall results of the trials suggest that screening very likely reduces breast cancer mortality. Despite some peccadillos of the trials, I agree with the overall conclusion. I always have. So why have I been painted as being anti-screening? It is because I am less enthusiastic about the consequences of sc...

BACKGROUND Interest in assessing the value of health-care services in Germany has considerably increased since the foundation of the Institut für Qualität und Wirtschaftlichkeit im Gesundheitswesen, IQWiG (Institute for Quality and Efficiency in Health Care). The practical application of value assessment illustrates how problematic the process can be. In all decisions made for the provision of ...

1.Introduction Large national sample surveys often use sample designs to cover the complexity of study objectives. Sample weights based on the features of the sample design are often incorporated into calculations to generate population estimates. The most common components of the sample weight are the base weight that reflects the different probabilities of selection and nonresponse adjustment...