abstract   background: postural instability has been identified as a potential precursor of falls in elderly subjects. postural stability in quiet stance is commonly assessed with center of pressure (cop) measures. the purpose of this study was to determine testretest reliability and minimal detectable change (mdc) for the center of pressure (cop) measures in the elderly subjects.   methods: ei...

background: this study aimed at determining the drug abuse pattern and the frequency of high-risk behaviors among the clients of methadone maintenance treatment centers and drop-in centers in shahroud county of semnan province. methods: in this cross-sectional study, the data collection tool was a questionnaire including 10 general and 32 specific items about drug abuse pattern and high-risk be...

a survey of mottled enamel in a military educational center in karaj area of metropolitan tehran was conducted from august to september 1978, on a population of 1789 student, aged 18-23 gathered from 32 areas of iran. dean clinical standards used for diagnosing dental fluorsis and orion lonalyzer fluoride electrode was used to determine the fluoride content of communal waters of endemic areas. ...

background: although it is usually recommended that children begin care after their second or third year, some employed parents have to enroll their children in childcare from under the age of 6 months in iran. regardless of when children enter care parents and experts are concern about how childcare affects children’s language, social and intellectual development. the aim of this study was to ...

system evaluations were performed on 48 center pivots in different parts of saudi arabia. these systems, located on different farms in four different regions of the country, namely: riyadh, jouf, qassim and eastern regions, were evaluated to study the effect of lateral configuration on water application uniformity as regards the original vs. modified laterals. lateral configuration modification...

Solving geometric optimization problems over uncertain data have become increasingly important in many applications and have attracted a lot of attentions in recent years. In this paper, we study two important geometric optimization problems, the k-center problem and the j-flat-center problem, over stochastic/uncertain data points in Euclidean spaces. For the stochastic k-center problem, we wou...

Morton, Marcus, and Frankish (1976) defined "perceptual center," or "P-center," as a neutral term to describe that which is regular in a perceptually regular sequence of speech sounds_ This paper describes a paradigm for the determination of P-center location and the effect of various acoustic parameters on empirically determined P-center locations, It is shown that P-center location is affecte...