NASA Scientific and Technical Aerospace Reports

20060001694 Motorola, Inc., Schaumburg, IL, USA
The Architecture and Application of the Motorola DSP56000 Digital Signal Processor Family
Kloker, Kevin L.; IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ‘87); Volume 1; 1987,
pp. 523-526; In English; See also 20060001583; Copyright; Avail.: Other Sources
This paper describes the architecture and applications of the DSP56001, a RAM-based member of Motorola DSP56000
family of high performance, programmable CMOS digital signal processors. DSP56001 has 512 x 24 bits of program RAM
and special on-chip bootstrap hardware to download user programs from an external memory or host processor. DSP56001
also contains two 256 x 24 bit data and two 256 x 24 bit ROM lookup tables for Mu-law/A-law to linear data conversion and
sine/cosine functions. The processor architecture and instruction set are highly parallel, executing 10.25 million instructions
per second with a 20.5 MHz Fixed point arithmetic is performed by a 24 x 24 bit, non-pipelined multiply-accumulator with
56 bit product accumulation. Extensive I/C capability is provided by a full-speed memory expansion port, a wide host
processor interface, an asynchronous communications interface and a time division multiplexed, synchronous serial interface.
Author
Architecture (Computers); Applications Programs (Computers); Signal Processing; Digital Systems
20060001717 NYNEX Science and Technology, Inc., White Plains, NY, USA
A New Heuristic Edge Extraction Technique
Shu, Joseph S. P.; IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ‘87); Volume 1; 1987,
pp. 7.20.1-7.20.4; In English; See also 20060001583; Copyright; Avail.: Other Sources
The problem of detecting intensity changes within images is canonical in computer vision. This research paper presents
a new heuristic edge extraction (HEE) technique for solving the problem. The HEE consists of the following processes:
processing, Sobel edge detection, thinning edge operation, A Iota A* algorithm (minimum-cost-searching scheme), and chain
coding. The preprocessing improves image quality to facilitate edge extraction. Sobel edge detection is used for obtaining the
spatially accurate multi-pixel-wide edges within input images. The thinning edge operation yields one-pixel-wide edges by
processing the Sobel edges. A Iota A* algorithm extracts optimal curve edge segments based on the use of both thinned edge
intensity and Sobel edge direction (i.e. gradient direction). Finally, the chain coding technique is applied to encode extracted
optimal curse edge segments. The HEE provides, therefore, spatially accurate, high-quality, and exactly one-pixel-wide edges
as system output.
Author
Edge Detection; Edges; Heuristic Methods; Extraction
20060001769 Naval Research Lab., Washington, DC USA
A Formal Syntax and Semantics for the GSPML Language
McDermott, John P.; Oct. 31, 2005; 60 pp.; In English
Contract(s)/Grant(s): Proj-IT-235-007
Report No.(s): AD-A440151; NRL/MR/5540-05-8919; No Copyright; Avail.: Defense Technical Information Center (DTIC)
This report formally defines both a syntax and a semantics for the GSPML visual language. The syntax is defined with
a hypergraph grammar and the semantics is defined with Plotkin style structural operational semantics. A decorated trace
semantics is derived from the labeled transition system of the structural operational semantics. GSPML itself is motivated by
shortcomings in the visual security modeling capabilities of the Model Driven Architecture (MDA) .
DTIC
Computer Information Security; Computer Programming; Languages; Protocol (Computers); Security; Semantics;
Simulation; Software Engineering; Syntax
20060001784 Maryland Univ., Baltimore, MD USA
Combining Infrastructure and Ad Hoc Collaboration for Data Management in Mobile Wireless Networks
Ratsimor, Olga; Kodeswaran, Sethuram B.; Joshi, Anupam; Finin, Tim; Yesha, Yelena; Jan. 1, 2005; 11 pp.; In English
Contract(s)/Grant(s): F30602-00-2-0591
Report No.(s): AD-A440200; No Copyright; Avail.: Defense Technical Information Center (DTIC)
A mobile ad-hoc network is an autonomous system of mobile routers that are self-organizing and completely decentralized
with no requirements for dedicated infrastructure support. However, such infrastructure in terms of base stations is available
in many popular areas already. These base stations often offer high-speed data connectivity to a wired network. In this paper,
we describe an approach where a combination of infrastructure and ad hoc communication can be used to better manage the
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