In this paper, a star tracker attitude estimation procedure with increased robustness and efficiency, using the AIM (Attitude Estimation using optimal Image Matching) algorithm, is presented and validated. The unique approach of the AIM algorithm allows us to introduce a reliable quality check which can be efficiently calculated. Unlike existing validation methods, this quality check not only d...

This survey of attitude theory and research published between 1996 and 1999 covers the conceptualization of attitude, attitude formation and activation, attitude structure and function, and the attitude-behavior relation. Research regarding the expectancy-value model of attitude is considered, as are the roles of accessible beliefs and affective versus cognitive processes in the formation of at...

One of the key concepts in the research on political attitudes is attitude strength. Strong attitudes are durable and impactful, while weak attitudes are fluctuating and inconsequential. Recently, the Causal Attitude Network (CAN) model was proposed as a comprehensive measurement model of attitudes. In this model, attitudes are conceptualized as networks of causally connected evaluative reactio...

Research Article Khim-Yong Goh National University of Singapore [email protected] Jerry Wenjie Ping National University of Singapore [email protected] Advergames are increasingly popular for online advertising campaigns. However, few IS studies have investigated the effectiveness of this unique advertising strategy. This study sheds light on the effectiveness of advergames by study...

The Unaided Single Frequency/Single Epoch Global Navigation Satellite System (SF/SE GNSS) model is the most challenging scenario for ambiguity resolution in the GNSS attitude determination application. To improve the performance of SF/SE-GNSS ambiguity resolution without excessive cost, the Micro-Electro-Mechanical System Inertial Measurement Unit (MEMS-IMU) is a proper choice for the auxiliary...

This paper describes a quaternion implementation of an Unscented Kalman Filter for attitude estimation on CubeSats using measurements of a sun vector, a magnetic field vector and angular velocity. For faster convergence of the attitude estimate, a SVD-method solving Wahba’s problem has been proposed, which provides an initial attitude estimate. Using unit quaternions provides a singularity free...

OBJECTIVE To examine the relationship of psychosocial stress and attitude toward illness to psychological adjustment among youth with chronic arthritis. METHODS Seventy-five youths with chronic arthritis aged 8-18 years were administered a semi-structured interview assessing illness-related and nonillness-related stressors in important life domains. Children also completed measures of attitud...

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...

Two experiments were conducted to examine the impact on anonymity and accountability on the expression of group-mediated attitude-behaviour consistency. In Study 1, low and high identifiers (N = 106) were exposed to an attitude-congruent norm and provided information on intentions under anonymous and in-group accountable conditions. In Study 2, salience of identity was manipulated, participants...

This paper considers the problem of attitude synchronization for a group of flexible spacecraft based on distributed attitude cooperative control strategy. Based on the backstepping design, non-smooth control, and the neighbor-based design rule, a distributed attitude control law is constructed step by step. Under the proposed control law, it is shown that the attitude synchronization is achiev...