We present a novel ‘‘spectral subtraction algorithm’’ (SSA) technique to remove speckle noise. It consists of a loworder and a high-order SSA and is based on a three-dimensional image spectroscopy in which the three-dimensional data cube is available and thus the speckle noise introduced by the wave-front error can be efficiently subtracted. For the low-order SSA, speckles up to the second or t...

The Space Surveillance Telescope (SST), developed by MIT Lincoln Laboratory through sponsorship of the Defense Advanced Research Projects Agency (DARPA), has demonstrated significant capability improvements over legacy ground-based optical space surveillance systems. To fulfill better the current and future space situational awareness (SSA) requirements, the Air Force would benefit from a globa...

The neural network-based nonlinear singular spectrum analysis (NLSSA) is applied to the zonal winds in the 70-10 hPa region (roughly 20-30 km altitude) measured at near-equatorial stations during 1956-2000. The data are pre-filtered by the linear singular spectrum analysis (SSA), with the leading 8 SSA principal components (PCs) used as inputs for the NLSSA. The NLSSA fits a curve to the data i...

Analysis of symbolic expressions beneets from a suitable program representation. We show how to build thinned gated single-assignment (TGSA) form, a value-oriented program representation which is more complete than standard SSA form, deened on all reducible programs , and better for representing symbolic expressions than program dependence graphs or original GSA form. We present practical algor...

ASIP processors are tuned for optimized mapping of narrow application sets in heterogeneous platforms. Their successful development relies on compiler-based design space exploration. The careful design of the compiler intermediate language is a necessity, due to its dual purpose as both the program representation and an abstract target machine. Its design affects the complexity, efficiency and ...

Spaced seeds are important tools for similarity search in bioinformatics, and using several seeds together often significantly improves their performance. With existing approaches, however, for each seed we keep a separate linear-size data structure, either a hash table or a spaced suffix array (SSA). In this paper we show how to compress SSAs relative to normal suffix arrays (SAs) and still su...

By 2050, half of the net increase in world’s population is expected to reside sub-Saharan Africa (SSA), driving high urbanization rates and drastic land cover changes. However, data-scarce environment SSA limits our understanding urban dynamics region. In this context, Earth Observation (EO) an opportunity gather accurate up-to-date spatial information on extents. During last decade, adoption o...

background: sialic acid is a component of serum that is elevated in diseases such as diabetes and certain malignancies.  the normal range of ssa concentration and serum neuraminidase activity in different populations are varied, probably due to racial differences.   objective: the purpose of the present study was to obtain the average ssa concentration and serum neuraminidase activity, in an ir...

As a result of continual space activity since the 1950s, there are now a large number of man-made Resident Space Objects (RSOs) orbiting the Earth. Because of the large number of items and their relative speeds, the possibility of destructive collisions involving important space assets is now of significant concern to users and operators of space-borne technologies. Consequently, a growing numb...