OBJECTIVES The purpose of this study was to examine associations between intention to smoke, and 3 constructs of the Theory of Planed Behavior, including attitude, subjective norm, and perceived behavioral control related to smoking among adolescents in South Korea. METHODS We used a cross-sectional correlational design. The survey was conducted on 13- to 15-year-old adolescents (N = 740) in ...

This chapter presents a Higher Order Sliding Mode (HOSM) Control for automatic docking between two space vehicles. The problem considered requires controlling the vehicles’ relative position and relative attitude. This type of problem is generally addressed using optimal control techniques that are, unfortunately, not robust. The combination of optimum control and Higher Order Sliding Mode Cont...

A robust control allocation scheme is developed for rigid spacecraft attitude stabilization in the presence of actuator partial loss fault, actuator failure, and actuator misalignment. First, a neural network fault detection scheme is proposed, Second, an adaptive attitude tracking strategy is employed which can realize fault tolerance control under the actuator partial loss and actuator failur...

This paper considers the problem of controlling relative attitude between two spacecrafts, so as to follow a smoothly time varying desired relative attitude trajectory. The spacecrafts are modelled as rigid bodies and attitudes are represented in non-linear state space of SO(3). The attitude control law proposed does not need relative attitude measurement and is determined from line of sight (L...

It is well known that three momentum wheel actuators can be used to control the attitude of a rigid spacecraft and that arbitrary reorientation maneuvers of the spacecraft can be accomplished using smooth feedback. If failure of one of the momentum wheel actuators occurs, we demonstrate that two momentum wheel actuators can be used to control the attitude of a rigid spacecraft and that arbitrar...

This article presents a robust and almost global feedback attitude tracking control scheme in conjunction with a robust deterministic estimator that constructs state estimates for feedback. These control and the estimation schemes use the natural and globally unique representation of rigid body attitude provided by rotation matrices. Attitude and angular velocity state estimates are constructed...

This paper develops a fault tolerant attitude controller for next generation nanosatellites. The proposed fault tolerant attitude control algorithms in this study are based on first order and high order sliding mode control theory as well as fuzzy logic systems to achieve low cost and real time autonomy. A locally asymptotically stable adaptive fuzzy first order sliding mode controller is chose...

The main purpose of this paper is to propose a nonlinear H∞ and mixed 2 / H H∞ self-fuzzy algorithm to solve large-angle robust control problem. The attitude control is one of the studied problems in recent years. Under the space environment, there often exists an unpredictable interference which results some deviations of satellite’s attitude. Therefore, it needs to develop a controller still ...

Generally, the attitude estimation and the measurement of the angular velocity are a requirement for the attitude control. As a result, the computational cost and the complexity of the control loop are relatively high. In the present paper, a technique for attitude stabilization is proposed; the technique proposed is designed with attitude estimation based in data fusion of an Attitude and Head...

This paper addresses the attitude tracking of a rigid body using a quaternion description. Global finite-time attitude controllers are designed with three types of measurements, namely, full states, attitude plus constant-biased angular velocity, and attitude only. In all three scenarios hybrid control techniques are utilized to overcome the well-known topological constraint on the attitude man...