5,214 research outputs found
A Jones polynomial for braid-like isotopies of oriented links and its categorification
A braid-like isotopy for links in 3-space is an isotopy which uses only those
Reidemeister moves which occur in isotopies of braids. We define a refined
Jones polynomial and its corresponding Khovanov homology which are, in general,
only invariant under braid-like isotopies.Comment: 19 pages, many figure
Track association performance of the best hypotheses search method
Uncontrolled space objects in the geostationary orbit domain
are hazardous threats for active satellites. Catalogs
need to be build up, in order to protect this precious
domain. The Swiss ZimSMART telescope, located
in Zimmerwald, regularly scans the geostationary ring in
order to provide a homogenous coverage. This surveying
technique typically yields short measurement arcs,
called tracklets. Each tracklet provides information about
the line-of-sight and the rates of change but typically not
about the full state of the observed object. Computationally
intensive multi-hypothesis filter methods have been
developed to associate tracklets with each other. An effective
implementation to this approach is presented that
uses an optimization algorithm to reduce the number of
initial hypotheses. The method is tested with a set of real
measurements of the aforementioned telescope
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