This paper contrasts three different schemes of reference relevant to understanding systems of perceptual representation: a location-based system dubbed "feature-placing", a system of "visual indices" referring to things called "proto-objects", and the full sortal-based individuation allowed by a natural language. The first three sections summarize some of the key arguments (in Clark 2000) to t...

Maneuver detection is a very important task for maintaining the catalog of the orbital objects and space situational awareness. This paper mainly focuses on the typical maneuver scenario, where space objects only perform tangential orbital maneuvers during a relative long gap. Particularly, only two classical and commonly applied orbital transition manners are considered, i.e. the twice tangent...

Consider the ordinary situations where we perceptually interact with our immediate environment. We identify and recognize objects and their sensible features by perceiving them. Our immediate focus and interest are normally the objects of our perception , understood in the broadest possible way (states, events, processes, conditions or their sensible features, etc.). We see the apple on the tab...