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AMMOS-PDS Pipeline Service (APPS) — Label Design Tool (LDT)

NASA’s Jet Propulsion Laboratory, Pasadena, California A software program builds PDS4 science product label (metadata) and automatically generates its description as part of the software interface specification (SIS) document. This software allows the mission system engineer to interact programmatically with the PDS4 information model, and retrieve science product metadata information via graphical user interfaces (GUIs). This capability will greatly improve the processes of creating and generating software interface specification documents for science instruments. Given that PDS4 is a newly defined standard, most of the work that is simplified by this software suite is being done manually. This improvement allows the definition and design of PDS4 science data archive models for generating PDS4 compliant labels.

Posted in: Briefs, TSP

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Activity Model Problem Translator

NASA’s Jet Propulsion Laboratory, Pasadena, California The Problem Translator is a software program that translates functional Unified Modeling Language (fUML) activity models into a behavior-based computational problem representation language called Behavior XML (BXML). The BXML translation may then be solved by engines such as the Behavior and Analysis Engine. The translation software uniquely adds timing and richer problem-solving semantics to the standard fUML by translating activity models, augmented with timing and other constraints on events and state variables, into a tool-agnostic behavioral XML specification.

Posted in: Briefs

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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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Computer Aided Design of Suspension Mechanisms

Automobile suspension mechanisms have to date been designed using two-dimensional graphic oriented methods. Computer-aided design has allowed many two-dimensional mechanisms to be designed much more accurately. However, this has not translated to suspension mechanisms because these mechanisms are not two-dimensional but instead three-dimensional.

Posted in: White Papers, Electronics & Computers

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