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...

Introduction: The Joint Milli-Arcsecond Pathfinder Survey 1 (JMAPS) is a Department of the Navy space astrometry mission to conduct an all-sky, bright star astrometric and spectrophotometric survey. The primary goal of the mission is to update the bright star catalog currently used by Department of Defense, NASA, and commercial star tracker manufacturers for spacecraft attitude determination. S...

In this paper we present a PID+ backstepping controller, as a solution to the problem of coordinated attitude control in spacecraft formations. The control scheme is based on quaternions and modified Rodriguez parameters as attitude representation of the relative attitude error. Utilizing the invertibility of the modified Rodriguez parameter kinematic differential equation, a globally exponenti...

In this paper, we explore the utility of attitude types for improving question answering (QA) on both web-based discussions and news data. We present a set of attitude types developed with an eye toward QA and show that they can be reliably annotated. Using the attitude annotations, we develop automatic classifiers for recognizing two main types of attitudes: sentiment and arguing. Finally, we ...

BACKGROUND Domestic violence (DV) is a serious problem all over the world which had been extended to boundaries of countries, economical, cultural and racial classes. 10-69 percent of women are exposed to physical, sexual and emotional violence which has numerous physical and emotional consequences. Therefore, males' attitude towards women is one of the strongest predicting factors of violence ...

We present and test a formal framework for expressing the idea that taking account of the multiple meanings conveyed by natural language may help economists to better understand the impact of pre-play free-form communication. We model coordination games where each player simultaneously requests others to take a particular action. We assume requests include two independent features: the desired ...

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...