OBJECTIVES Our aims were (1) to describe rates of suboptimal control and controller medication underuse in a diverse population of children with asthma and (2) to identify potentially modifiable parental behaviors and beliefs associated with these outcomes. METHODS We conducted telephone interviews with parents of 2- to 12-year-old children with persistent asthma, in a Medicaid plan and a lar...

This paper presents a successive approximation method (SAM) for solving a large class of optimal control problems. The proposed analytical-approximate method, successively solves the Two-Point Boundary Value Problem (TPBVP), obtained from the Pontryagin's Maximum Principle (PMP). The convergence of this method is proved and a control design algorithm with low computational complexity is present...

In this paper we show how to compute suboptimal H 1 controllers, for a class of (possibly) unstable and (possibly) innnite dimensional plants, from a nite set of linear equations. A solution to the H 1 suboptimal control problem for innnite dimensional stable plants was obtained in 6]. Also, in 13] and 14] the H 1 optimal control problem was solved for unstable distributed plants. Our solution ...

A state feedback H 1 suboptimal control problem on T SO(3) for a rigid spacecraft with three control torques and disturbances is addressed. The Hamilton-Jacobi inequality associated with a corresponding state feedback H 1 suboptimal control problem on T S 3 is solved globally. The H 1 suboptimal state feedback on T S 3 involves the Euler parameters and solves the original problem on T SO(3) whe...

In the present paper we address a state feedback H 1 suboptimal control problem for a rigid spacecraft with three control torques and disturbances. The state feedback H 1 suboptimal control problem on T SO(3) is transferred to a corresponding state feedback H 1 suboptimal control problem on T S 3 , and the Hamilton-Jacobi inequality associated with this problem is solved. We obtain a state feed...

BACKGROUND Although periconceptional glycemic control directly impacts perinatal outcome for pregestational diabetic women, these women still frequently enter pregnancy with suboptimal control of glycemia. OBJECTIVES To determine how frequently diabetic women enter pregnancy with suboptimal glycemic control and to identify factors associated with not achieving optimal periconceptual control o...