Topics
Features
Publications
Issue Archive
Tool for Merging Proposals Into DSN Schedules
A Practical Extraction and Reporting Language (Perl) script called “merge7da” has been developed to facilitate determination, by a project scheduler in NASA’s Deep Space Network, of whether a proposal for use of the DSN could create a conflict with the current DSN schedule. Prior to the development of merge7da, there was no way to quickly identify potential schedule conflicts: it was necessary to submit a proposal and wait a day or two for a response from a DSN scheduling facility. By using merge7da to detect and eliminate potential schedule conflicts before submitting a proposal, a project scheduler saves time and gains assurance that the proposal will probably be accepted. merge7da accepts two input files, one of which contains the current DSN schedule and is in a DSNstandard format called “7da.”
Simulation of Stochastic Processes by Coupled ODEPDE
A document discusses the emergence of randomness in solutions of coupled, fully deterministic ODEPDE (ordinary differential equationspartial differential equations) due to failure of the Lipschitz condition as a new phenomenon. It is possible to exploit the special properties of ordinary differential equations (represented by an arbitrarily chosen, dynamical system) coupled with the corresponding Liouville equations (used to describe the evolution of initial uncertainties in terms of joint probability distribution) in order to simulate stochastic processes with the proscribed probability distributions. The important advantage of the proposed approach is that the simulation does not require a randomnumber generator.
Genetic Algorithm Optimizes QLAW Control Parameters
A document discusses a multiobjective, genetic algorithm designed to optimize Lyapunov feedback control law (Qlaw) parameters in order to efficiently find Pareto optimal solutions for lowthrust trajectories for electronic propulsion systems. These would be propellantoptimal solutions for a given flight time, or flight time optimal solutions for a given propellant requirement. The approximate solutions are used as good initial solutions for highfidelity optimization tools. When the good initial solutions are used, the highfidelity optimization tools quickly converge to a locally optimal solution near the initial solution.
QuantumInspired Maximizer
A report discusses an algorithm for a new kind of dynamics based on a quantumclassical hybridquantuminspired maximizer. The model is represented by a modified Madelung equation in which the quantum potential is replaced by different, specially chosen “computational” potential. As a result, the dynamics attains both quantum and classical properties: it preserves superposition and entanglement of random solutions, while allowing one to measure its state variables, using classical methods. Such optimal combination of characteristics is a perfect match for quantuminspired computing. As an application, an algorithm for global maximum of an arbitrary integrable function is proposed. The idea of the proposed algorithm is very simple: based upon the Quantuminspired Maximizer (QIM), introduce a positive function to be maximized as the probability density to which the solution is attracted. Then the larger value of this function will have the higher probability to appear.
Spiking Neurons for Analysis of Patterns
Highperformance patternanalysis systems could be implemented as analog VLSI circuits.
Artificial neural networks comprising spiking neurons of a novel type have been conceived as improved pattern analysis and pattern recognition computational systems. These neurons are represented by a mathematical model denoted the state variable model (SVM), which among other things, exploits a computational parallelism inherent in spikingneuron geometry. Networks of SVM neurons offer advantages of speed and computational efficiency, relative to traditional artificial neural networks. The SVM also overcomes some of the limitations of prior spikingneuron models. There are numerous potential patternrecognition, tracking, and datareduction (data preprocessing) applications for these SVM neural networks on Earth and in exploration of remote planets.
Symmetric PhaseOnly Filtering in ParticleImage Velocimetry
Performance is enhanced significantly with little increase in computation time.
Symmetrical phaseonly filtering (SPOF) can be exploited to obtain substantial improvements in the results of data processing in particle image velocimetry (PIV). In comparison with traditional PIV data processing, SPOF PIV data processing yields narrower and larger amplitude correlation peaks, thereby providing moreaccurate velocity estimates. The higher signaltonoise ratios associated with the higher amplitude correlation peaks afford greater robustness and reliability of processing. SPOF also affords superior performance in the presence of surface flare light and/or background light. SPOF algorithms can readily be incorporated into preexisting algorithms used to process digitized image data in PIV, without significantly increasing processing times.
Supplier Management System
Supplier Management System (SMS) allows for a consistent, agencywide performance rating system for suppliers used by NASA. This version (2.0) combines separate databases into one central database that allows for the sharing of supplier data. Information extracted from the NBS/Oracle database can be used to generate ratings. Also, supplier ratings can now be generated in the areas of cost, product quality, delivery, and audit data. Supplier data can be charted based on realtime user input. Based on these individual ratings, an overall rating can be generated.
Improved CLARAty FunctionalLayer/DecisionLayer Interface
Improved interface software for communication between the CLARAty Decision and Functional layers has been developed. [The Coupled Layer Architecture for Robotics Autonomy (CLARAty) was described in “CoupledLayer Robotics Architecture for Autonomy” (NPO21218), NASA Tech Briefs, Vol. 26, No. 12 (December 2002), page 48. To recapitulate: the CLARAty architecture was developed to improve the modularity of robotic software while tightening coupling between planning/execution and basic control subsystems. Whereas prior robotic software architectures typically contained three layers, the CLARAty contains two layers: a decision layer (DL) and a functional layer (FL).] Types of communication supported by the present software include sending commands from DL modules to FL modules and sending data updates from FL modules to DL modules.
JAVA Stereo Display Toolkit
This toolkit provides a common interface for displaying graphical user interface (GUI) components in stereo using either specialized stereo display hardware (e.g., liquid crystal shutter or polarized glasses) or anaglyph display (red/blue glasses) on standard workstation displays. An application using this toolkit will work without modification in either environment, allowing stereo software to reach a wider audience without sacrificing highquality display on dedicated hardware.
PyPele Rewritten To Use MPI
A computer program known as “PyPele,” originally written as a Pythonlanguage extension module of a C++ language program, has been rewritten in pure Python language. The original version of PyPele dispatches and coordinates parallel processing tasks on cluster computers and provides a conceptual framework for spacecraftmission design and analysis software tools to run in an embarrassingly parallel mode. The original version of PyPele uses SSH (Secure Shell — a set of standards and an associated network protocol for establishing a secure channel between a local and a remote computer) to coordinate parallel processing. Instead of SSH, the present Python version of PyPele uses Message Passing Interface (MPI) [an unofficial defacto standard languageindependent application programming interface for messagepassing on a parallel computer] while keeping the same user interface.
Question of the Week

Will origamiinspired crawler robots support pipe inspection?
This week’s lead story featured an origamiinspired robot. Assistant professor Aimy Wissa sees possible pipe inspection applications for the crawler. "Pipes have different kinds of diameters, and you want something that can fit in there with ease,"...
Digital Edition
Newsletter
Subscribe today to receive the INSIDER, a FREE email newsletter from Tech Briefs featuring exclusive previews of upcoming articles, late breaking industry news, hot products and design ideas, links to online resources, and much more.
TRENDING THIS MONTH
 Pen Device Identifies Cancer in Seconds
 Learning to Crawl: Origami Robot Moves Like an Earthworm
 Should Pluto be restored as a planet?
 Designing the fuelefficient aircraft of the future
 Melt Infiltration of SiC/SiC Preforms Using CrSi Alloys
 Sprayable Aerogel Bead Compositions With High Shear Flow Resistance and High Thermal Insulation Value
 Wireless Tamper Detection Sensor and Sensing System
Stratasys
Read the latest white paper from Stratasys Direct Manufacturing on how 3D printing is transforming manufacturing through new technologies and greater design possibilities.