{"id":"https://openalex.org/W2133889471","doi":"https://doi.org/10.1109/isspa.2007.4555274","title":"Determination of the group velocity using the time-varying autoregressive TVAR","display_name":"Determination of the group velocity using the time-varying autoregressive TVAR","publication_year":2007,"publication_date":"2007-02-01","ids":{"openalex":"https://openalex.org/W2133889471","doi":"https://doi.org/10.1109/isspa.2007.4555274","mag":"2133889471"},"language":"en","primary_location":{"id":"doi:10.1109/isspa.2007.4555274","is_oa":false,"landing_page_url":"https://doi.org/10.1109/isspa.2007.4555274","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2007 9th International Symposium on Signal Processing and Its Applications","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/A5110656812","display_name":"Rachid Latif","orcid":"https://orcid.org/0000-0001-9833-1614"},"institutions":[{"id":"https://openalex.org/I4210088687","display_name":"Universit\u00e9 Ibn Zohr","ror":"https://ror.org/006sgpv47","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210088687"]},{"id":"https://openalex.org/I29607241","display_name":"\u00c9cole Normale Sup\u00e9rieure - PSL","ror":"https://ror.org/05a0dhs15","country_code":"FR","type":"funder","lineage":["https://openalex.org/I2746051580","https://openalex.org/I29607241"]}],"countries":["FR","MA"],"is_corresponding":true,"raw_author_name":"R. Latif","raw_affiliation_strings":["LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","Ecole Nat. des Sci. Appl., Univ. Ibn Zohr, Agadir"],"affiliations":[{"raw_affiliation_string":"LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","institution_ids":["https://openalex.org/I4210088687"]},{"raw_affiliation_string":"Ecole Nat. des Sci. Appl., Univ. Ibn Zohr, Agadir","institution_ids":["https://openalex.org/I29607241"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5109237807","display_name":"El Houcein Aassif","orcid":null},"institutions":[{"id":"https://openalex.org/I4210088687","display_name":"Universit\u00e9 Ibn Zohr","ror":"https://ror.org/006sgpv47","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210088687"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"E. Aassif","raw_affiliation_strings":["LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","LMTI, Laboratoire de M\u00e9trologie et de Traitement de l\u00bfInformation, Universit\u00e9 Ibn Zohr, Agadir, Maroc, France"],"affiliations":[{"raw_affiliation_string":"LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","institution_ids":["https://openalex.org/I4210088687"]},{"raw_affiliation_string":"LMTI, Laboratoire de M\u00e9trologie et de Traitement de l\u00bfInformation, Universit\u00e9 Ibn Zohr, Agadir, Maroc, France","institution_ids":[]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5112729639","display_name":"M. Laaboubi","orcid":null},"institutions":[{"id":"https://openalex.org/I4210088687","display_name":"Universit\u00e9 Ibn Zohr","ror":"https://ror.org/006sgpv47","country_code":"MA","type":"education","lineage":["https://openalex.org/I4210088687"]}],"countries":["MA"],"is_corresponding":false,"raw_author_name":"M. Laaboubi","raw_affiliation_strings":["LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","LMTI, Laboratoire de M\u00e9trologie et de Traitement de l\u00bfInformation, Universit\u00e9 Ibn Zohr, Agadir, Maroc, France"],"affiliations":[{"raw_affiliation_string":"LMTI, Laboratoirede Metrologie etde Traitementde l Information, Universite Ibn Zohr, Agadir, Morocco","institution_ids":["https://openalex.org/I4210088687"]},{"raw_affiliation_string":"LMTI, Laboratoire de M\u00e9trologie et de Traitement de l\u00bfInformation, Universit\u00e9 Ibn Zohr, Agadir, Maroc, France","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5111769380","display_name":"G. Maz\u00e9","orcid":null},"institutions":[{"id":"https://openalex.org/I141576021","display_name":"Universit\u00e9 Le Havre Normandie","ror":"https://ror.org/05v509s40","country_code":"FR","type":"education","lineage":["https://openalex.org/I141576021","https://openalex.org/I4210105918"]}],"countries":["FR"],"is_corresponding":false,"raw_author_name":"G. Maze","raw_affiliation_strings":["Laboratoire dAcoustique Ultrasonoreet dElectronique, LAUE, Le Havre, France","LAUE, Laboratoire d\u00bfAcoustique Ultrasonore et d\u00bfElectronique, Le Havre, France"],"affiliations":[{"raw_affiliation_string":"Laboratoire dAcoustique Ultrasonoreet dElectronique, LAUE, Le Havre, France","institution_ids":["https://openalex.org/I141576021"]},{"raw_affiliation_string":"LAUE, Laboratoire d\u00bfAcoustique Ultrasonore et d\u00bfElectronique, Le Havre, France","institution_ids":["https://openalex.org/I141576021"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5110656812"],"corresponding_institution_ids":["https://openalex.org/I29607241","https://openalex.org/I4210088687"],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.16770602,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"10","issue":null,"first_page":"1","last_page":"4"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10662","display_name":"Ultrasonics and Acoustic Wave Propagation","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2211","display_name":"Mechanics of Materials"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10662","display_name":"Ultrasonics and Acoustic Wave Propagation","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2211","display_name":"Mechanics of Materials"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11698","display_name":"Underwater Acoustics Research","score":0.998199999332428,"subfield":{"id":"https://openalex.org/subfields/1910","display_name":"Oceanography"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11160","display_name":"Acoustic Wave Resonator Technologies","score":0.9962000250816345,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/autoregressive-model","display_name":"Autoregressive model","score":0.829575777053833},{"id":"https://openalex.org/keywords/antisymmetric-relation","display_name":"Antisymmetric relation","score":0.7736944556236267},{"id":"https://openalex.org/keywords/spectral-density","display_name":"Spectral density","score":0.5399567484855652},{"id":"https://openalex.org/keywords/signal","display_name":"SIGNAL (programming language)","score":0.5028724074363708},{"id":"https://openalex.org/keywords/dispersion","display_name":"Dispersion (optics)","score":0.4796357750892639},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.46971315145492554},{"id":"https://openalex.org/keywords/group-velocity","display_name":"Group velocity","score":0.45726048946380615},{"id":"https://openalex.org/keywords/representation","display_name":"Representation (politics)","score":0.4335315227508545},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.4324430227279663},{"id":"https://openalex.org/keywords/mode","display_name":"Mode (computer interface)","score":0.43130627274513245},{"id":"https://openalex.org/keywords/mathematical-analysis","display_name":"Mathematical analysis","score":0.40611353516578674},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.258294016122818},{"id":"https://openalex.org/keywords/optics","display_name":"Optics","score":0.20939233899116516},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.1539144217967987}],"concepts":[{"id":"https://openalex.org/C159877910","wikidata":"https://www.wikidata.org/wiki/Q2202883","display_name":"Autoregressive model","level":2,"score":0.829575777053833},{"id":"https://openalex.org/C152401794","wikidata":"https://www.wikidata.org/wiki/Q583760","display_name":"Antisymmetric relation","level":2,"score":0.7736944556236267},{"id":"https://openalex.org/C168110828","wikidata":"https://www.wikidata.org/wiki/Q1331626","display_name":"Spectral density","level":2,"score":0.5399567484855652},{"id":"https://openalex.org/C2779843651","wikidata":"https://www.wikidata.org/wiki/Q7390335","display_name":"SIGNAL (programming language)","level":2,"score":0.5028724074363708},{"id":"https://openalex.org/C177562468","wikidata":"https://www.wikidata.org/wiki/Q182893","display_name":"Dispersion (optics)","level":2,"score":0.4796357750892639},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.46971315145492554},{"id":"https://openalex.org/C181341577","wikidata":"https://www.wikidata.org/wiki/Q217361","display_name":"Group velocity","level":2,"score":0.45726048946380615},{"id":"https://openalex.org/C2776359362","wikidata":"https://www.wikidata.org/wiki/Q2145286","display_name":"Representation (politics)","level":3,"score":0.4335315227508545},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.4324430227279663},{"id":"https://openalex.org/C48677424","wikidata":"https://www.wikidata.org/wiki/Q6888088","display_name":"Mode (computer interface)","level":2,"score":0.43130627274513245},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.40611353516578674},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.258294016122818},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.20939233899116516},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.1539144217967987},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.0},{"id":"https://openalex.org/C94625758","wikidata":"https://www.wikidata.org/wiki/Q7163","display_name":"Politics","level":2,"score":0.0},{"id":"https://openalex.org/C37914503","wikidata":"https://www.wikidata.org/wiki/Q156495","display_name":"Mathematical physics","level":1,"score":0.0},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0},{"id":"https://openalex.org/C199539241","wikidata":"https://www.wikidata.org/wiki/Q7748","display_name":"Law","level":1,"score":0.0},{"id":"https://openalex.org/C17744445","wikidata":"https://www.wikidata.org/wiki/Q36442","display_name":"Political science","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/isspa.2007.4555274","is_oa":false,"landing_page_url":"https://doi.org/10.1109/isspa.2007.4555274","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2007 9th International Symposium on Signal Processing and Its Applications","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":15,"referenced_works":["https://openalex.org/W1497968110","https://openalex.org/W1606627838","https://openalex.org/W2042796267","https://openalex.org/W2062186317","https://openalex.org/W2082293743","https://openalex.org/W2102557862","https://openalex.org/W2103234008","https://openalex.org/W2115737494","https://openalex.org/W2119483567","https://openalex.org/W2138148439","https://openalex.org/W2148981399","https://openalex.org/W2188563164","https://openalex.org/W3151807103","https://openalex.org/W4309573086","https://openalex.org/W6677648337"],"related_works":["https://openalex.org/W1968494762","https://openalex.org/W2527696949","https://openalex.org/W3196557860","https://openalex.org/W2075821346","https://openalex.org/W2385749544","https://openalex.org/W4378550401","https://openalex.org/W1976222415","https://openalex.org/W2077398250","https://openalex.org/W2072823176","https://openalex.org/W2355143115"],"abstract_inverted_index":{"A":[0,136],"time-varying":[1,73],"autoregressive":[2],"ldquoTVARrdquo":[3],"approach":[4],"is":[5,14,79,139],"used":[6],"for":[7,58],"modeling":[8],"nonstationary":[9],"signals,":[10],"and":[11,90],"frequency":[12],"information":[13],"then":[15],"extracted":[16],"from":[17],"the":[18,26,29,33,49,59,64,82,85,107,114,127,133],"TVAR":[19,30,60],"parameters.":[20],"In":[21],"this":[22,44],"study,":[23],"we":[24,111],"present":[25],"application":[27],"of":[28,43,67,84,87],"spectrum":[31,74],"on":[32],"acoustic":[34],"signal":[35,69],"backscattered":[36],"by":[37,48,126],"an":[38],"elastic":[39],"tube.":[40],"The":[41,52,72],"parameters":[42],"model":[45],"are":[46,121],"determined":[47],"adaptive":[50,53],"algorithm.":[51],"methods":[54],"may":[55],"be":[56],"sufficient":[57],"parameter":[61],"estimation,":[62],"if":[63],"nonstationay":[65],"part":[66],"a":[68,97,100],"changes":[70],"slowly.":[71],"ldquoTVARSrdquo":[75],"(power":[76],"spectral":[77],"density)":[78],"applied":[80],"to":[81,104],"analysis":[83],"dispersion":[86],"symmetric":[88],"S0":[89],"antisymmetric":[91],"A1":[92],"circumferential":[93],"waves":[94],"propagating":[95],"around":[96],"tube":[98],"with":[99,117,123],"radii":[101],"ratio":[102],"equal":[103],"0.95.":[105],"From":[106],"TFAR":[108],"representation":[109],"obtained,":[110],"have":[112],"estimated":[113],"group":[115],"velocity":[116],"precision.":[118],"These":[119],"velocities":[120],"compared":[122],"those":[124],"computed":[125],"proper":[128],"mode":[129],"theory":[130],"given":[131],"in":[132],"scientific":[134],"literature.":[135],"good":[137],"agreement":[138],"obtained.":[140]},"counts_by_year":[{"year":2013,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}