{"id":"https://openalex.org/W2081598885","doi":"https://doi.org/10.1109/hpcsim.2014.6903675","title":"Solving a very large-scale sparse linear system with a parallel algorithm in the Gaia mission","display_name":"Solving a very large-scale sparse linear system with a parallel algorithm in the Gaia mission","publication_year":2014,"publication_date":"2014-07-01","ids":{"openalex":"https://openalex.org/W2081598885","doi":"https://doi.org/10.1109/hpcsim.2014.6903675","mag":"2081598885"},"language":"en","primary_location":{"id":"doi:10.1109/hpcsim.2014.6903675","is_oa":false,"landing_page_url":"https://doi.org/10.1109/hpcsim.2014.6903675","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2014 International Conference on High Performance Computing & Simulation (HPCS)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5069218099","display_name":"U. Becciani","orcid":"https://orcid.org/0000-0002-4389-8688"},"institutions":[{"id":"https://openalex.org/I4210122196","display_name":"Osservatorio Astrofisico di Catania","ror":"https://ror.org/02my7ff12","country_code":"IT","type":"facility","lineage":["https://openalex.org/I4210122196","https://openalex.org/I875825670"]}],"countries":["IT"],"is_corresponding":true,"raw_author_name":"Ugo Becciani","raw_affiliation_strings":["INAF Astrophysical Observatory of Catania"],"affiliations":[{"raw_affiliation_string":"INAF Astrophysical Observatory of Catania","institution_ids":["https://openalex.org/I4210122196"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5053068096","display_name":"\u202c\u202c\u202c\u202c\u202c\u202cEva Sciacca","orcid":"https://orcid.org/0000-0002-5574-2787"},"institutions":[{"id":"https://openalex.org/I4210122196","display_name":"Osservatorio Astrofisico di Catania","ror":"https://ror.org/02my7ff12","country_code":"IT","type":"facility","lineage":["https://openalex.org/I4210122196","https://openalex.org/I875825670"]}],"countries":["IT"],"is_corresponding":false,"raw_author_name":"Eva Sciacca","raw_affiliation_strings":["INAF Astrophysical Observatory of Catania"],"affiliations":[{"raw_affiliation_string":"INAF Astrophysical Observatory of Catania","institution_ids":["https://openalex.org/I4210122196"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5107030660","display_name":"Marilena Bandieramonte","orcid":null},"institutions":[{"id":"https://openalex.org/I4210122196","display_name":"Osservatorio Astrofisico di Catania","ror":"https://ror.org/02my7ff12","country_code":"IT","type":"facility","lineage":["https://openalex.org/I4210122196","https://openalex.org/I875825670"]},{"id":"https://openalex.org/I39063666","display_name":"University of Catania","ror":"https://ror.org/03a64bh57","country_code":"IT","type":"education","lineage":["https://openalex.org/I39063666"]}],"countries":["IT"],"is_corresponding":false,"raw_author_name":"Marilena Bandieramonte","raw_affiliation_strings":["Dept. of Physics and Astronomy, University of Catania","INAF Astrophysical Observatory of Catania"],"affiliations":[{"raw_affiliation_string":"Dept. of Physics and Astronomy, University of Catania","institution_ids":["https://openalex.org/I39063666"]},{"raw_affiliation_string":"INAF Astrophysical Observatory of Catania","institution_ids":["https://openalex.org/I4210122196"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5047515672","display_name":"Alberto Vecchiato","orcid":"https://orcid.org/0000-0003-1399-5556"},"institutions":[{"id":"https://openalex.org/I4210155633","display_name":"Astronomical Observatory","ror":"https://ror.org/04t4pcw17","country_code":"RS","type":"facility","lineage":["https://openalex.org/I4210155633"]}],"countries":["RS"],"is_corresponding":false,"raw_author_name":"Alberto Vecchiato","raw_affiliation_strings":["INAF Astronomical Observatory of Torino"],"affiliations":[{"raw_affiliation_string":"INAF Astronomical Observatory of Torino","institution_ids":["https://openalex.org/I4210155633"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5057015887","display_name":"B. Bucciarelli","orcid":"https://orcid.org/0000-0002-5303-0268"},"institutions":[{"id":"https://openalex.org/I4210155633","display_name":"Astronomical Observatory","ror":"https://ror.org/04t4pcw17","country_code":"RS","type":"facility","lineage":["https://openalex.org/I4210155633"]}],"countries":["RS"],"is_corresponding":false,"raw_author_name":"Beatrice Bucciarelli","raw_affiliation_strings":["INAF Astronomical Observatory of Torino"],"affiliations":[{"raw_affiliation_string":"INAF Astronomical Observatory of Torino","institution_ids":["https://openalex.org/I4210155633"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5020776665","display_name":"M. G. Lattanzi","orcid":"https://orcid.org/0000-0003-0429-7748"},"institutions":[{"id":"https://openalex.org/I4210155633","display_name":"Astronomical Observatory","ror":"https://ror.org/04t4pcw17","country_code":"RS","type":"facility","lineage":["https://openalex.org/I4210155633"]}],"countries":["RS"],"is_corresponding":false,"raw_author_name":"Mario G. Lattanzi","raw_affiliation_strings":["INAF Astronomical Observatory of Torino"],"affiliations":[{"raw_affiliation_string":"INAF Astronomical Observatory of Torino","institution_ids":["https://openalex.org/I4210155633"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":6,"corresponding_author_ids":["https://openalex.org/A5069218099"],"corresponding_institution_ids":["https://openalex.org/I4210122196"],"apc_list":null,"apc_paid":null,"fwci":0.2065,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.67647287,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":97},"biblio":{"volume":null,"issue":null,"first_page":"104","last_page":"111"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.9977999925613403,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.9977999925613403,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12917","display_name":"Astronomy and Astrophysical Research","score":0.9937000274658203,"subfield":{"id":"https://openalex.org/subfields/3105","display_name":"Instrumentation"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13126","display_name":"Scientific Research and Discoveries","score":0.9915000200271606,"subfield":{"id":"https://openalex.org/subfields/3109","display_name":"Statistical and Nonlinear Physics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.655217707157135},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.6121771931648254},{"id":"https://openalex.org/keywords/normalization","display_name":"Normalization (sociology)","score":0.5554172992706299},{"id":"https://openalex.org/keywords/ibm","display_name":"IBM","score":0.5031284689903259},{"id":"https://openalex.org/keywords/convergence","display_name":"Convergence (economics)","score":0.4799802005290985},{"id":"https://openalex.org/keywords/parallel-computing","display_name":"Parallel computing","score":0.33643582463264465},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.12645798921585083}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.655217707157135},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.6121771931648254},{"id":"https://openalex.org/C136886441","wikidata":"https://www.wikidata.org/wiki/Q926129","display_name":"Normalization (sociology)","level":2,"score":0.5554172992706299},{"id":"https://openalex.org/C70388272","wikidata":"https://www.wikidata.org/wiki/Q5968558","display_name":"IBM","level":2,"score":0.5031284689903259},{"id":"https://openalex.org/C2777303404","wikidata":"https://www.wikidata.org/wiki/Q759757","display_name":"Convergence (economics)","level":2,"score":0.4799802005290985},{"id":"https://openalex.org/C173608175","wikidata":"https://www.wikidata.org/wiki/Q232661","display_name":"Parallel computing","level":1,"score":0.33643582463264465},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.12645798921585083},{"id":"https://openalex.org/C162324750","wikidata":"https://www.wikidata.org/wiki/Q8134","display_name":"Economics","level":0,"score":0.0},{"id":"https://openalex.org/C144024400","wikidata":"https://www.wikidata.org/wiki/Q21201","display_name":"Sociology","level":0,"score":0.0},{"id":"https://openalex.org/C19165224","wikidata":"https://www.wikidata.org/wiki/Q23404","display_name":"Anthropology","level":1,"score":0.0},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.0},{"id":"https://openalex.org/C50522688","wikidata":"https://www.wikidata.org/wiki/Q189833","display_name":"Economic growth","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/hpcsim.2014.6903675","is_oa":false,"landing_page_url":"https://doi.org/10.1109/hpcsim.2014.6903675","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2014 International Conference on High Performance Computing & Simulation (HPCS)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320318240","display_name":"European Space Agency","ror":"https://ror.org/03wd9za21"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":11,"referenced_works":["https://openalex.org/W1978523809","https://openalex.org/W1983534948","https://openalex.org/W2034600161","https://openalex.org/W2047488287","https://openalex.org/W2063880337","https://openalex.org/W2097897435","https://openalex.org/W2169455070","https://openalex.org/W2990747251","https://openalex.org/W3015864866","https://openalex.org/W4292954804","https://openalex.org/W6776013679"],"related_works":["https://openalex.org/W3126131865","https://openalex.org/W4253186488","https://openalex.org/W2044344400","https://openalex.org/W1996938127","https://openalex.org/W2083611981","https://openalex.org/W2072507639","https://openalex.org/W4231814374","https://openalex.org/W2155964760","https://openalex.org/W2043380045","https://openalex.org/W2099557065"],"abstract_inverted_index":{"Gaia":[0,67],"is":[1,19,65,98],"a":[2,23,73,89,125,130,145,157],"5-year":[3],"ESA":[4],"(European":[5],"Space":[6],"Agency)":[7],"cornerstone":[8],"mission":[9,182],"launched":[10],"at":[11,38,112],"the":[12,20,31,35,39,59,66,107,114,133,136,141,148,153,163,172,181],"end":[13],"of":[14,22,34,47,52,58,75,102,106,116,124,132,135,147,177,180],"2013.":[15],"Its":[16],"main":[17,56],"goal":[18],"production":[21],"5-parameter":[24],"astrometric":[25,68],"catalogue":[26],"(i.e.":[27],"positions,":[28],"parallaxes":[29],"and":[30,83,92,165],"two":[32],"components":[33],"proper":[36],"motions)":[37],"micro-arcsecond":[40],"level":[41],"for":[42],"about":[43],"1":[44],"billion":[45,79],"stars":[46],"our":[48],"Galaxy":[49],"by":[50,72,100],"means":[51,101],"high-precision":[53],"measurements.":[54],"The":[55],"task":[57],"code":[60],"presented":[61],"in":[62,88,129],"this":[63],"paper":[64],"core":[69],"solution,":[70],"represented":[71],"system":[74,94,137,160],"up":[76],"to":[77,139,185],"72":[78],"linear":[80],"observations":[81],"equations":[82],"600":[84],"million":[85],"unknowns,":[86],"resulting":[87],"very":[90],"large":[91],"sparse":[93],"matrix.":[95],"This":[96],"problem":[97],"solved":[99],"an":[103],"ad-hoc":[104],"implementation":[105],"PC-LSQR":[108],"iterative":[109],"algorithm":[110],"aimed":[111],"maximizing":[113],"number":[115],"adjustable":[117],"stellar":[118],"objects,":[119],"which":[120],"makes":[121],"also":[122,169],"use":[123],"pre-conditioning":[126],"technique":[127],"consisting":[128],"re-normalization":[131],"columns":[134],"matrix":[138],"improve":[140],"convergence":[142],"speed.":[143],"After":[144],"description":[146],"parallel":[149],"algorithm,":[150],"we":[151],"present":[152],"results":[154],"obtained":[155,174],"on":[156,171],"IBM":[158],"BlueGeneQ":[159],"using":[161],"both":[162],"message-passing":[164],"OpenMP":[166],"paradigms.":[167],"We":[168],"report":[170],"performances":[173],"from":[175,183],"simulations":[176],"different":[178],"stages":[179],"beginning":[184],"end.":[186]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":3},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}