Wichita State University

About: Wichita State University is a education organization based out in Wichita, Kansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 4988 authors who have published 9563 publications receiving 253824 citations. The organization is also known as: WSU & Fairmount College.

Validation of measures from the smartphone sway balance application: a pilot study

Abstract: Purpose/Background: A number of different balance assessment techniques are currently available and widely used These include both subjective and objective assessments The ability to provide quantitative measures of balance and posture is the benefit of objective tools, however these instruments are not generally utilized outside of research laboratory settings due to cost, complexity of operation, size, duration of assessment, and general practicality The purpose of this pilot study was to assess the value and validity of using software developed to access the iPod and iPhone accelerometers output and translate that to the measurement of human balance Methods: Thirty healthy college-aged individuals (13 male, 17 female; age = 261 ± 85 years) volunteered Participants performed a static Athlete’s Single Leg Test protocol for 10 sec, on a Biodex Balance System SD while concurrently utilizing a mobile device with balance software Anterior/posterior stability was recorded using both devices, described as the displacement in degrees from level, and was termed the “balance score” Results: There were no significant differences between the two reported balance scores (p = 0818 Mean balance score on the balance platform was 141 ± 090, as compared to 138 ± 072 using the mobile device Conclusions: There is a need for a valid, convenient, and cost-effective tool to objectively measure balance Results of this study are promising, as balance score derived from the Smartphone accelerometers were consistent with balance scores obtained from a previously validated balance system However, further investigation is necessary as this version of the mobile software only assessed balance in the anterior/posterior direction Additionally, further testing is necessary on a healthy populations and as well as those with impairment of the motor control system Level of Evidence: Level 2b (Observational study of validity) 1

Design of Automatic Landing Systems Using Mixed H/H Control

Abstract: Mixed H2/HX control technique is employed to develop controllers for auto-landing systems for a commercial airplane. A linear model of the aircraft in longitudinal motion is established using the appropriate aerodynamic coefficients. With the control actuator, tracking errors, and altitude motion, the aircraft is shown to be governed by an augmentation system along with its filter model. Two kinds of optimal and robust control requirements are designed, which need to be satisfied simultaneously. One of requirements is with respect to an optimal trajectory selection for landing routes. The H2 method is used to minimize a cost function such that the optimal gain for trajectory optimization can be obtained. The other requirement is with respect to the disturbance attenuation. The Hm technique is employed to obtain the necessary formulation for the robust control gain to minimize the affection of the disturbance to the performance output. An algorithm is developed based on the convex theory for the mixed H2I Hn control and filter gains, which provides a suboptimal solution. A large commercial aircraft (Boeing 747-200) is employed to illustrate the potential of the proposed method. It is shown that the glide slope capture motion and flare maneuver of the aircraft are accomplished quite well, and the amplitudes of all maneuver are within FAA requirements. L INTRODUCTION Control of aircraft under difficult maneuvers is a problem of both theoretical and practical interest. Control under one of these difficult maneuvers, that of landing, is discussed and addressed in this paper. Design of automatic landing systems has been achieved using both robust and optimal control methods [1-3]. Reference [1] employed the #„ synthesis to design an automatic landing controller for an F-14 aircraft. Design of landing systems encountering windshear is given in

Feasible Nonparametric Estimation of Multiargument Monotone Functions

Abstract: This article presents a two-stage estimation procedure that uses an ad hoc but very easily implemented isotonization of a kernel estimator. This procedure yields an isotonic estimator with the convergence properties of the kernel estimator. Although the isotonization in the second stage does not satisfy the least squares condition, this hybrid estimator may be considered to be a multidimensional generalization of similar procedures for the one-dimensional case suggested by Friedman and Tibshirani and by Mukarjee. We derive some of the asymptotic properties of our estimator and demonstrate other statistical properties with Monte Carlo studies. We conclude by providing a real data example.

β-hydroxy-β-methylbutyrate (HMB) kinetics and the influence of glucose ingestion in humans

Abstract: The dietary supplement, β-hydroxy-β-methylbutyrate (HMB), has been shown to decrease muscle proteolysis during the stress of exercise and disease. The aim of this investigation was to determine the time course kinetics of HMB and to determine whether oral glucose ingestion alters the kinetics. In Study 1, eight males (32 ± 10 yrs) participated in two randomize trials: 1) oral ingestion of 1g of HMB with water in capsule form (HMB), and 2) placebo. Blood samples were obtained prior to ingestion of treatment and at 30, 60, 90, 120, 150, and 180 min for the measurement of plasma HMB. Additional blood samples were obtained at 6, 9, and 12 hr. Urine was collected prior to ingestion and at 3, 6, 9, and 12 h for the measurement of urinary HMB. In Study 2, eight males (25 ± 6 yrs) followed the same study design and testing procedure as for Study 1. Treatments were 1) modified glucose tolerance test (75 g glucose) (GLU), 2) oral ingestion of 3 g of HMB with water (HMB), and 3) ingestion of 3 g of HMB with 75 g of glucose (HMB+GLU). Blood samples were analyzed for insulin, glucose, and HMB. Additional blood samples were obtained at 24h and 36h for the measurement of HMB. Additional urine samples were collected at 24h and 36h. In Study 1, plasma HMB peaked at 120 nmol/ml at 2.0 ± 0.4 hr in HMB trial. Half-life was 2.37 ± 0.1 hr. Following the consumption of 1g of HMB, ∼14% of the HMB consumed accumulated in the urine. In Study 2, plasma glucose and insulin levels were significantly greater in GLU and HMB+GLU treated subjects compared to HMB treated subject at minutes 30, 60 and 90. Plasma HMB peaked at 487.9 ± 19.0 nmol/ml at 1.0 ± 0.1 hr in the HMB treated subjects and at 352.1 ± 15.3 nmol/ml at 1.94 ± 0.2 hr when subjects consumed HMB+GLU. The time to reach peak was different (P

Parent’s Social Support for Children’s Outdoor Physical Activity: Do Weekdays and Weekends Matter?

Abstract: In this study we examined the relationships among parental social supportive behaviors for children’s weekday and weekend outdoor physical activity (OPA). Thirty-nine girls and 29 boys 8 to 11 years wore pedometers for 7 days. Sixty-five mothers and 50 fathers responded to a social support questionnaire about OPA that was comprised of four dimensions: encouragement, playing with, use of activity as family recreation, and watch. After controlling for age and sport participation, regression analyses indicated that mothers’ use of activity as recreation was positively associated with girls’ weekday OPA. On the weekend, fathers’ play with son was positively related to OPA. The effectiveness of family-based activity interventions depends on when parents have opportunities to be present for their child’s activity and gender differences in the support provided.