The stability of spacecraft attitude is studied with considering sinusoidal disturbance. A passive attitude controller without angular velocity measurement for spacecraft described by quaternion is designed. The passive controller has no information related to system parameters. So it has robustness to model error and uncertainty of model parameters. The stability of spacecraft attitude control...

Small satellites are now capable of performing missions that require accurate attitude determination and control. However, low size, power, and cost requirements limit the types of attitude sensors that can be used on a small craft, making attitude estimation difficult. In particular, star trackers—often the attitude sensors of choice for larger spacecraft—are not practical for small satellites...

It's fitting that my first contribution in the new " Attitude and Behavior " column addresses the age-old question, which comes first-attitude or behavior? Actually, the more practical question is which should be targeted for change first-attitude or behavior? Education typically addresses " attitude " or internal and subjective dimensions of people by attempting to " think people into acting d...

A novel split field of view star tracker is being developed for the EO-3 GIFTS mission (2004). The camera is designed to be autonomously self-calibrating, and capable of a rapid/reliable solution of the lost-in-space problem as well as recursive attitude estimation. Two efficient Kalman filter algorithms for attitude, camera principal point offset, and focal length estimation are developed. The...

The effect of elaboration (i.e., information processing) on attitude strength has been a key prediction of some of the most influential theories of persuasion over the past few decades. This article provides a new look at this relationship. After reviewing support for the notion that structural processes (i.e., knowledge acquisition, structural consistency, and attitude accessibility) drive the...

People are able to explicitly resist using knowledge about one person to evaluate another person from the same group. After learning about positive and negative behaviors performed by one individual from each of two different groups, participants were introduced briefly to new individuals from the groups. Implicit evaluations of the original individuals readily generalized to the new individual...

In this paper, a new algorithm is developed for attitude estimation using Global Positioning System (GPS) signals. The new algorithm is based on a predictive filtering scheme designed for spacecraft without rate measuring devices. The major advantage of this new algorithm over traditional Kalman filter approaches is that the model error is not assumed to represented by an unbiased Gaussian nois...

The present study explores the effects of social-media messages that are presented in television content. In particular, the retention of content and changes in attitude through watching television programs was investigated. Thirty participants were randomly assigned to one of two conditions: one that included social-media messages and one that omitted socialmedia messages. The participants’ ey...

Positive attitude is thought to impact academic achievement and learning in children, but little is known about its underlying neurocognitive mechanisms. Using a large behavioral sample of 240 children, we found that positive attitude toward math uniquely predicted math achievement, even after we accounted for multiple other cognitive-affective factors. We then investigated the neural mechanism...

This study examines how different types of information processing routes influence a user’s attitude toward an Enterprise Resource Planning (ERP) system based on the Elaboration Likelihood Model. We tested the main effects of content quality (central route) and system credibility (peripheral route) on attitude change and the moderating effects of motivation and IT ability. Using student survey ...