@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.nasa.gov/dataset/938e278d-413c-47e8-b090-5a12c00fe7ec> a dcat:Dataset ;
    dct:description "Within the area of systems health management, the task of prognostics centers on predicting when components will fail. Model-based prognostics exploits domain knowledge of the system, its components, and how they fail by casting the un- derlying physical phenomena in a physics-based model that is derived from first principles. Uncertainty cannot be avoided in prediction, therefore, algorithms are employed that help in managing these uncertainties. The particle filtering algorithm has become a popular choice for model-based prognostics due to its wide applicability, ease of implementation, and support for uncertainty management. We develop a general model- based prognostics methodology within a robust probabilistic framework using particle filters. As a case study, we consider a pneumatic valve from the Space Shuttle cryogenic refuel- ing system. We develop a detailed physics-based model of the pneumatic valve, and perform comprehensive simulation experiments to illustrate our prognostics approach and evalu- ate its effectiveness and robustness. The approach is demon- strated using historical pneumatic valve data from the refuel- ing system." ;
    dct:identifier "DASHLINK_758" ;
    dct:issued "2013-06-19"^^xsd:date ;
    dct:modified "2020-01-29"^^xsd:date ;
    dct:publisher <https://data.nasa.gov/organization/dbb294e4-8597-44f5-aaf4-c0baac12cdbc> ;
    dct:title "A Model-Based Prognostics Approach Applied to Pneumatic Valves" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Miryam Strautkalns" ;
            vcard:hasEmail <mailto:miryam.strautkalns@nasa.gov> ] ;
    dcat:distribution <https://data.nasa.gov/dataset/938e278d-413c-47e8-b090-5a12c00fe7ec/resource/3e9e8a04-c4c0-44b6-a9dd-db6e0a62255a> ;
    dcat:keyword "ames",
        "dashlink",
        "nasa" .

<https://data.nasa.gov/dataset/938e278d-413c-47e8-b090-5a12c00fe7ec/resource/3e9e8a04-c4c0-44b6-a9dd-db6e0a62255a> a dcat:Distribution ;
    dct:description "2011_IJPHM_valves.pdf" ;
    dct:format "PDF" ;
    dct:issued "2025-03-31T22:05:19.452041"^^xsd:dateTime ;
    dct:modified "2025-03-31T22:05:19.439040"^^xsd:dateTime ;
    dct:title "2011_IJPHM_valves.pdf" ;
    dcat:accessURL <https://c3.nasa.gov/dashlink/static/media/publication/2011_IJPHM_valves.pdf> ;
    dcat:mediaType "application/pdf" .

<https://data.nasa.gov/organization/dbb294e4-8597-44f5-aaf4-c0baac12cdbc> a foaf:Agent ;
    foaf:name "NASA" .