Horizon from Taiwan

Horizon Angle from Video

This article details the work of the authors towards the goal of using video processing for autonomous flight control of small unmanned aircraft (UAVs). The work reports on procedures that were designed by the authors to determine the roll of an aircraft from video imagery of the horizon, using video and computing equipment small and light enough to be carried by the aircraft. Theory and result...

Analyzing the Impact of Credit Ratings on Firm Performance and Stock Returns: Evidence from Taiwan

The respective study covers three aspects; factors determining credit rating, credit rating impact on performance of entities and the relation between stock returns and credit rating. The study focuses on the firms listed in Taiwan Stock Exchange (TSE) of Taiwan. The empirical analysis uses the data of 50 firms rated by Taiwan Ratings Corporation (TRC) for the period 2010-2015. Two estimation t...

Tales From Taiwan: Mourning

Isolated Horizon , Killing Horizon and Event Horizon

We consider space-times which in addition to admitting an isolated horizon also admit Killing horizons with or without an event horizon. We show that an isolated horizon is a Killing horizon provided either (1) it admits a stationary neighbourhood or (2) it admits a neighbourhood with two independent, commuting Killing vectors. A Killing horizon is always an isolated horizon. For the case when ...

Aircraft attitude estimation from horizon video

Measurement of aircraft attitude is a necessary step for the autonomous control of the aircraft. Autonomous aircraft are useful for a range of military and civilian purposes. A method of very low computational complexity is presented that allows the pitch and roll angles of an aircraft to be measured onboard an unmanned aircraft from real-time video of the horizon. This method can be used for m...