SIS is a Satellite controller Integrated with Star sensors, which has been developed as a prototype model of a compact, low-cost satellite controller. SIS integrates attitude sensors into a star sensor and integrates several electronics for star identification, attitude determination, attitude control, and data handling into a single processing unit. SIS meets high reliability requirements by a...

Proper modeling of the Global Positioning System (GPS) satellite yaw attitude is important in high-precision applications. A new model for the GPS satellite yaw attitude is introduced that constitutes a significant improvement over the previously available model in terms of efficiency, flexibility, and portability. The model is described in detail, and implementation issues, including the prope...

This paper describes an obstacle detection system for a high-speed and agile unmanned surface vehicle (USV), running at speeds up to 30 m/s. The aim is a real-time and high performance obstacle detection system using both radar and vision technologies to detect obstacles within a range of 175 m. A computer vision horizon detector enables a highly accurate attitude estimation despite large and s...

A teachable-agent arithmetic game is presented and evaluated in terms of student performance, attitude and self-efficacy. An experimental prepost study design was used, enrolling 153 3 and 5 grade students in Sweden. The playing group showed significantly larger gains in math performance and self-efficacy beliefs, but not in general attitude towards math, compared to control groups. The contrib...

Background: Exclusive breastfeeding is one of the most important issues for public health and Pediatricians in developing countries. Despite the importance of exclusive breastfeeding, only 39% of children in the world are breastfed during the first six months of life.Methods: This study was a Cross-sectional descriptive-analysis conducted on a total number of 396 breastfeeding mothers in ...