@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix org: <http://www.w3.org/ns/org#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.nasa.gov/dataset/2d3ae664-901f-4636-9e47-64339ac670dd> a dcat:Dataset ;
    dct:description "Model-based prognostics exploits domain knowl- edge of the system, its components, and how they fail by casting the underlying physical phenom- ena in a physics-based model that is derived from first principles. In most applications, uncertain- ties from a number of sources cause the predic- tions to be inaccurate and imprecise even with accurate models. Therefore, algorithms are em- ployed that help in managing these uncertainties. Particle filters have become a popular choice to solve this problem due to their wide applicability and ease of implementation. We present a gen- eral model-based prognostics methodology using particle filters. In order to provide more accu- rate and precise estimates, and, therefore, more accurate and precise predictions, we investigate the use of fixed-lag filters. We develop a detailed physics-based model of a pneumatic valve, and perform comprehensive simulation experiments to illustrate our prognostics approach. The exper- iments demonstrate the advantages that fixed-lag filters may provide in the context of prognostics, as measured by prognostics performance metrics." ;
    dct:identifier "DASHLINK_769" ;
    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 "Model-based Prognostics with Fixed-lag Particle Filters" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Miryam Strautkalns" ;
            vcard:hasEmail <mailto:miryam.strautkalns@nasa.gov> ] ;
    dcat:distribution <https://data.nasa.gov/dataset/2d3ae664-901f-4636-9e47-64339ac670dd/resource/caddfb70-117f-455b-a7c6-13bb108d68bb> ;
    dcat:keyword "ames",
        "dashlink",
        "nasa" .

<https://data.nasa.gov/dataset/2d3ae664-901f-4636-9e47-64339ac670dd/resource/caddfb70-117f-455b-a7c6-13bb108d68bb> a dcat:Distribution ;
    dct:description "2009_PHM_ValveFixedLagFilter.pdf" ;
    dct:format "PDF" ;
    dct:identifier "caddfb70-117f-455b-a7c6-13bb108d68bb" ;
    dct:issued "2025-03-31T21:07:05.131563"^^xsd:dateTime ;
    dct:modified "2025-03-31T21:07:05.119539"^^xsd:dateTime ;
    dct:title "2009_PHM_ValveFixedLagFilter.pdf" ;
    dcat:accessURL <https://c3.nasa.gov/dashlink/static/media/publication/2009_PHM_ValveFixedLagFilter.pdf> ;
    dcat:mediaType "application/pdf" .

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