A critical requirement in achieving robust space situational awareness (SSA) is the ability to process and reduce the number of uncorrelated tracks (UCTs), which are newly acquired tracks on objects that do not associate (correlate) with any known objects in the space catalog.1 While there are many reasons for UCTs, a common source is that of a maneuvering space object. The ability to assess th...

JONATHAN M. WATERS1,∗, STEVEN A. TREWICK2, ADRIAN M. PATERSON3, HAMISH G. SPENCER1, MARTYN KENNEDY1, DAVE CRAW4, CHRISTOPHER P. BURRIDGE5, AND GRAHAM P. WALLIS6 1Allan Wilson Centre for Molecular Ecology and Evolution, Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand; 2Ecology Group, IAE, Massey University, Private Bag 11-222, Palmerston North, New Zealand; 3Departmen...

The probability distribution function of the avalanche size in the sandpile model does not verify strict self-similarity under changes of the sandpile size. Here we show the existence of avalanches with different space-time structure, and each type of avalanche has a different scaling with the sandpile size. This is the main cause of the lack of self-similarity of the probability distribution f...

Theories of shapes are important for object recognition and for reasoning about the behaviour of objects, both tasks strongly constrained by shape. Whereas the extraction of shape properties has extensively been studied in vision, there is still a lack of qualitative shape descriptions which allow reasoning about shapes with AI techniques in a flexible manner. In this paper we present a qualita...

Certain systems with slow driving and avalanche–like dissipation events are naturally close to a critical point when the ratio of two energy scales is large. The first energy scale is the threshold above which an avalanche is triggered, the second scale is the threshold above which a site is affected by an avalanche. I present results of computer simulations, and a mean–field theory. PACS numbe...

Power estimation and optimization has become a key issue in embedded system design, especially in the rapidly growing market of mobile handheld computing, communication, internet devices that are driven by battery power. It is of paramount importance to estimate and optimize power of those systems during an early design stage at a high level of abstraction in order to efficiently explore the de...