Electrical/Electronics

Ontological System for Context Artifacts and Resources (OSCAR)

NASA’s Jet Propulsion Laboratory, Pasadena, California Current data systems catalog and link data using a synthetic modeling approach that requires much domain knowledge in order to interact with the system. Domain knowledge includes what keyword to look for and how data artifacts are linked. OSCAR offers a semantic solution to data management by using ontology and reasoning. Information is automatically linked according to its internal ontology. An internal ontological reasoning engine handles information inference. Artifacts are linked by information mined from the input metadata and reasoned according to the internal ontology.

Posted in: Briefs, TSP

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SPSCGR

NASA’s Jet Propulsion Laboratory, Pasadena, California SPSCGR generates a contact graph suitable for use by the ION (Interplanetary Overlay Network) DTN (Delay/Disruption Tolerant Network) implementation from data provided by the JPL SPS (Service Preparation System) Portal. Prior to SPSCGR, there was no way for a mission or other entity to route DTN traffic across the DSN without manually constructing a contact graph. SPSCGR automates this process of contact graph construction.

Posted in: Briefs, TSP

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Retools: Restriping Tools for Lustre

Ames Research Center, Moffett Field, California Modern parallel file systems achieve high performance by distributing (“striping”) the contents of a single file across multiple physical disks to overcome single-disk I/O bandwidth limitations. The striping characteristics of a file determine how many disks it will be striped across and how large each stripe is. These characteristics can only be set at the time a file is created, and cannot be changed later. Standard open-source tools do not typically take striping into account when creating files, so files created by those tools will have their striping characteristics set to the default. The default stripe count is typically set to a small number to favor small files that are more numerous. A small default stripe count, however, penalizes large files that use the default settings, as they will be striped over fewer disks so access to these files will only achieve a fraction of the performance that is possible with a larger stripe count. A large default stripe count, however, causes small files to be striped over too many disks, which increases contention and reduces performance of the file system as a whole.

Posted in: Briefs

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Method and Program Code for Improving Machine Efficiency in the Computation of Nearly-Singular Integrals

Lyndon B. Johnson Space Center, Houston, Texas Currently, there is a need for the computational handling of near-singularities that arise in many branches of physics, particularly for handling near-strong singularities. An example of such singularities is presented by the case of gradients of Newton-type potentials and modified Newton-type potentials. Currently, practitioners resort to multiple methods that do not work well, suffer from accuracy issues, or work only for very specialized cases. Accuracy issues provide results that cannot be trusted. Using codes that work only for specialized cases results in either misapplication of the code, and hence reduced accuracy, or failed attempts at a solution or infrequent and expensive code modifications to handle new cases.

Posted in: Briefs, TSP

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2015 Create the Future Design Contest: Electronics Category Winner

Real-Time Fiber Optic Sensing System Lance Richards NASA Armstrong Flight Research Center Edwards, CA A team at NASA Armstrong has developed fiber optic sensing system (FOSS) technology that represents a major breakthrough in high-speed operational monitoring and sensing. Driven by ultra-efficient algorithms, FOSS can be used to determine, in real time, a variety of critical parameters including strain, shape deformation, temperature, liquid level, and operational loads. This state-of-the-art sensor system delivers reliable measurements in the most demanding environments confronted by aerospace, automotive, and energy sectors. FOSS is ideal for monitoring the structural health of aircraft, buildings, and dams; improving the efficiency of turbines and industrial equipment; and detecting instabilities within tunnels and power plants.

Posted in: Articles, Electronics

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When Wire Feedthroughs Make Sense

Engineers who work with pressure and vacuum chambers usually reach for off-the-shelf sealed bulkhead connectors when they need to pass power and signal wires through the chamber wall. And while these connectors may seem like the best or only way to breach the chamber walls, they can actually drive cost, impose unnecessary mechanical design constraints and trigger electrical problems. So what’s the alternative? Wire feedthroughs hermetically sealed with epoxy. Learn more in our white paper.

Posted in: White Papers

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Traceability Best Practices for Systems Engineers

Serious situations: In the middle of a project, your best customer changes a high-level business requirement. How will this change impact the system spec your engineers are working on right now? How will it impact scope for the upcoming release?

Posted in: White Papers, Electronics

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