Performance Degradation Due To Specular Multipath Intersymbol Interference

Plots of performance degradation are used to compare the effects of fading and intersymbol interference in a two-component specular multipath digital communications channel. Similar plots are then used to compare two practical receivers designed to combat the interference. Degradation plots are shown to allow easy identification of each receiver\u27s range of usefulness, as well as identification of variance bounds demanded of channel parameter estimates which the receivers require. Copyright © 1973 by The Institute of Electrical and Electronics Engineers, Inc

The Effect of Participation in Organized Soccer on Fitnessgram Scores in 11-12 Year Old Girls

Purpose: Childhood obesity is increasing at an alarming rate throughout the United States and has been associated with multiple health complications such as heart disease and diabetes. Due to these increasing rates and health effects, there is a need to determine effective methods to measure physical activity as well as promote physical activity. One form of determining a child\u27s level of fitness is through the Fitnessgram. This study was designed to determine if formally testing fitness levels with the Fitnessgram in 11-12 year old girls participating in organized soccer is correlated with changes in fitness levels from pre-season to post-season, determine if using a measure such as the Fitnessgram influences the motivation to participate in organized and nonorganized physical activities, and determine if girls participating in organized soccer have higher fitness levels when compared to normative data. Subjects: Subjects were recruited from a soccer club and consisted of four female soccer players ages 11 to 12. Inclusion was based on participation in organized girls soccer and exclusion was based on parent/guardian and/or player\u27s refusal to consent to participation. Instrumentation: The Fitnessgram was used to provide feedback on whether or not the child achieved the criterion referenced age and gender specific standards for physical activity or fitness. In addition, participants were asked to complete questionnaires relative to the study. Procedure: Fitnessgram protocol was followed to evaluate strength, flexibility, body composition, and endurance. Subjects completed six tests both pre and post season which included curl-ups, trunk lifts, push-ups, PACER, skinfold measurements and sit and reach. Data Analysis: A related sample t-test compared pre and post-season measurements for curl-ups, trunk lift, push-ups, PACER test, and sit and each measurements. Results: Results of this study revealed no significant difference in preseason Fitnessgram scores compared to post-season scores. Conclusion and Clinical Implications: A major focus of physical therapy is to promote health and wellness across the lifespan. This includes advocating the benefits of exercise, encouraging participation in physical activity, and educating on the risks of obesity. In the future health professionals as well and educators could utilize the Fitnessgram to provide an objective measure of a child\u27s fitness level in reference to standardized age and gender specific norms

Improved Poincare inequalities with weights

In this paper we prove that if $\Omega\in\mathbb{R}^n$ is a bounded John domain, the following weighted Poincare-type inequality holds: $$\inf_{a\in \mathbb{R}}\| (f(x)-a) w_1(x) \|_{L^q(\Omega)} \le C \|\nabla f(x) d(x)^\alpha w_2(x) \|_{L^p(\Omega)}$$ where $f$ is a locally Lipschitz function on $\Omega$, $d(x)$ denotes the distance of $x$ to the boundary of $\Omega$, the weights $w_1, w_2$ satisfy certain cube conditions, and $\alpha \in [0,1]$ depends on $p,q$ and $n$. This result generalizes previously known weighted inequalities, which can also be obtained with our approach

Null sets of harmonic measure on NTA domains: Lipschitz approximation revisited

We show the David-Jerison construction of big pieces of Lipschitz graphs inside a corkscrew domain does not require its surface measure be upper Ahlfors regular. Thus we can study absolute continuity of harmonic measure and surface measure on NTA domains of locally finite perimeter using Lipschitz approximations. A partial analogue of the F. and M. Riesz Theorem for simply connected planar domains is obtained for NTA domains in space. As a consequence every Wolff snowflake has infinite surface measure.Comment: 22 pages, 6 figure

Boundary Asymptotic Analysis for an Incompressible Viscous Flow: Navier Wall Laws

We consider a new way of establishing Navier wall laws. Considering a bounded domain $\Omega$ of R N , N=2,3, surrounded by a thin layer $\Sigma \epsilon$, along a part $\Gamma$2 of its boundary $\partial \Omega$, we consider a Navier-Stokes flow in $\Omega \cup \partial \Omega \cup \Sigma \epsilon$ with Reynolds' number of order 1/$\epsilon$ in $\Sigma \epsilon$. Using $\Gamma$-convergence arguments, we describe the asymptotic behaviour of the solution of this problem and get a general Navier law involving a matrix of Borel measures having the same support contained in the interface $\Gamma$2. We then consider two special cases where we characterize this matrix of measures. As a further application, we consider an optimal control problem within this context

Screening for Diabetes and Pre-Diabetes With Proposed A1C-Based Diagnostic Criteria

OBJECTIVE — An International Expert Committee (IEC) and the American Diabetes Asso-ciation (ADA) proposed diagnostic criteria for diabetes and pre-diabetes based on A1C levels. We hypothesized that screening for diabetes and pre-diabetes with A1C measurements would differ from using oral glucose tolerance tests (OGTT). RESEARCH DESIGN AND METHODS — We compared pre-diabetes, dysglycemia (diabetes or pre-diabetes), and diabetes identified by the proposed criteria (A1C 6.5 % for diabetes and 6.0–6.4 % [IEC] or 5.7–6.4 % [ADA] for high risk/pre-diabetes) with standard OGTT diagnoses in three datasets. Non-Hispanic white or black adults without known diabetes who had A1C and 75-g OGTT measurements were included from the prospective Screening for Impaired Glucose Tolerance study (n 1,581), and from the National Health and Nutrition Examination Survey (NHANES) III (n 2014), and NHANES 2005–2006 (n 1,111). RESULTS — OGTTs revealed pre-diabetes in 35.8 % and diabetes in 5.2 % of combined study subjects. A1C provided receiver operating characteristic (ROC) curve areas for diabetes of 0.79– 0.83, but ROC curve areas were 0.70 for dysglycemia or pre-diabetes. The proposed criteria missed 70 % of individuals with diabetes, 71–84 % with dysglycemia, and 82–94 % with pre