{"id":"https://openalex.org/W3023550073","doi":"https://doi.org/10.1155/2020/7684710","title":"Density Estimation System of Space Users Using High Frequencies of Speaker","display_name":"Density Estimation System of Space Users Using High Frequencies of Speaker","publication_year":2020,"publication_date":"2020-05-10","ids":{"openalex":"https://openalex.org/W3023550073","doi":"https://doi.org/10.1155/2020/7684710","mag":"3023550073"},"language":"en","primary_location":{"id":"doi:10.1155/2020/7684710","is_oa":true,"landing_page_url":"http://doi.org/10.1155/2020/7684710","pdf_url":"https://downloads.hindawi.com/journals/misy/2020/7684710.pdf","source":{"id":"https://openalex.org/S152111507","display_name":"Mobile Information Systems","issn_l":"1574-017X","issn":["1574-017X","1875-905X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310318577","host_organization_name":"IOS Press","host_organization_lineage":["https://openalex.org/P4310318577"],"host_organization_lineage_names":["IOS Press"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mobile Information Systems","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"hybrid","oa_url":"https://downloads.hindawi.com/journals/misy/2020/7684710.pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5060064993","display_name":"Myoungbeom Chung","orcid":"https://orcid.org/0000-0002-3082-3601"},"institutions":[{"id":"https://openalex.org/I4210117332","display_name":"Sungkyul University","ror":"https://ror.org/02dzzka09","country_code":"KR","type":"education","lineage":["https://openalex.org/I4210117332"]}],"countries":["KR"],"is_corresponding":true,"raw_author_name":"Myoungbeom Chung","raw_affiliation_strings":["Division of Computer Engineering, Sungkyul University, Anyang 14097, Republic of Korea"],"raw_orcid":"https://orcid.org/0000-0002-3082-3601","affiliations":[{"raw_affiliation_string":"Division of Computer Engineering, Sungkyul University, Anyang 14097, Republic of Korea","institution_ids":["https://openalex.org/I4210117332"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5060064993"],"corresponding_institution_ids":["https://openalex.org/I4210117332"],"apc_list":{"value":2100,"currency":"USD","value_usd":2100},"apc_paid":{"value":2100,"currency":"USD","value_usd":2100},"fwci":0.0,"has_fulltext":true,"cited_by_count":2,"citation_normalized_percentile":{"value":0.03636127,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":95},"biblio":{"volume":"2020","issue":null,"first_page":"1","last_page":"9"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10326","display_name":"Indoor and Outdoor Localization Technologies","score":0.9997000098228455,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"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/T10326","display_name":"Indoor and Outdoor Localization Technologies","score":0.9997000098228455,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"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/T12740","display_name":"Gait Recognition and Analysis","score":0.9866999983787537,"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"}},{"id":"https://openalex.org/T10860","display_name":"Speech and Audio Processing","score":0.9822999835014343,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.8098208904266357},{"id":"https://openalex.org/keywords/microphone","display_name":"Microphone","score":0.6959861516952515},{"id":"https://openalex.org/keywords/space","display_name":"Space (punctuation)","score":0.5587443709373474},{"id":"https://openalex.org/keywords/density-estimation","display_name":"Density estimation","score":0.5434437394142151},{"id":"https://openalex.org/keywords/estimation","display_name":"Estimation","score":0.4613720178604126},{"id":"https://openalex.org/keywords/real-time-computing","display_name":"Real-time computing","score":0.4508107900619507},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.2187855839729309},{"id":"https://openalex.org/keywords/operating-system","display_name":"Operating system","score":0.07303920388221741},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.06624007225036621},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.05861854553222656},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.05725488066673279}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8098208904266357},{"id":"https://openalex.org/C2778263558","wikidata":"https://www.wikidata.org/wiki/Q46384","display_name":"Microphone","level":3,"score":0.6959861516952515},{"id":"https://openalex.org/C2778572836","wikidata":"https://www.wikidata.org/wiki/Q380933","display_name":"Space (punctuation)","level":2,"score":0.5587443709373474},{"id":"https://openalex.org/C189508267","wikidata":"https://www.wikidata.org/wiki/Q17088227","display_name":"Density estimation","level":3,"score":0.5434437394142151},{"id":"https://openalex.org/C96250715","wikidata":"https://www.wikidata.org/wiki/Q965330","display_name":"Estimation","level":2,"score":0.4613720178604126},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.4508107900619507},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.2187855839729309},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.07303920388221741},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.06624007225036621},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.05861854553222656},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.05725488066673279},{"id":"https://openalex.org/C201995342","wikidata":"https://www.wikidata.org/wiki/Q682496","display_name":"Systems engineering","level":1,"score":0.0},{"id":"https://openalex.org/C185429906","wikidata":"https://www.wikidata.org/wiki/Q1130160","display_name":"Estimator","level":2,"score":0.0},{"id":"https://openalex.org/C68115822","wikidata":"https://www.wikidata.org/wiki/Q1068172","display_name":"Sound pressure","level":2,"score":0.0}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.1155/2020/7684710","is_oa":true,"landing_page_url":"http://doi.org/10.1155/2020/7684710","pdf_url":"https://downloads.hindawi.com/journals/misy/2020/7684710.pdf","source":{"id":"https://openalex.org/S152111507","display_name":"Mobile Information Systems","issn_l":"1574-017X","issn":["1574-017X","1875-905X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310318577","host_organization_name":"IOS Press","host_organization_lineage":["https://openalex.org/P4310318577"],"host_organization_lineage_names":["IOS Press"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mobile Information Systems","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:d912373013fa484dab65ebca46d1d85f","is_oa":false,"landing_page_url":"https://doaj.org/article/d912373013fa484dab65ebca46d1d85f","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Mobile Information Systems, Vol 2020 (2020)","raw_type":"article"},{"id":"pmh:oai:hindawi.com:10.1155/2020/7684710","is_oa":true,"landing_page_url":"https://doi.org/10.1155/2020/7684710","pdf_url":null,"source":{"id":"https://openalex.org/S4306400340","display_name":"Hindawi Journal of Chemistry (Hindawi)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210126990","host_organization_name":"Hindawi (United Kingdom)","host_organization_lineage":["https://openalex.org/I4210126990"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Research Article"}],"best_oa_location":{"id":"doi:10.1155/2020/7684710","is_oa":true,"landing_page_url":"http://doi.org/10.1155/2020/7684710","pdf_url":"https://downloads.hindawi.com/journals/misy/2020/7684710.pdf","source":{"id":"https://openalex.org/S152111507","display_name":"Mobile Information Systems","issn_l":"1574-017X","issn":["1574-017X","1875-905X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310318577","host_organization_name":"IOS Press","host_organization_lineage":["https://openalex.org/P4310318577"],"host_organization_lineage_names":["IOS Press"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mobile Information Systems","raw_type":"journal-article"},"sustainable_development_goals":[{"score":0.4399999976158142,"display_name":"Affordable and clean energy","id":"https://metadata.un.org/sdg/7"}],"awards":[{"id":"https://openalex.org/G181774628","display_name":null,"funder_award_id":"NRF-2019R1H1A1079104","funder_id":"https://openalex.org/F4320321408","funder_display_name":"Ministry of Education"},{"id":"https://openalex.org/G5243150141","display_name":null,"funder_award_id":"NRF-2016R1C1B2007930","funder_id":"https://openalex.org/F4320321408","funder_display_name":"Ministry of Education"}],"funders":[{"id":"https://openalex.org/F4320321408","display_name":"Ministry of Education","ror":"https://ror.org/01p262204"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3023550073.pdf","grobid_xml":"https://content.openalex.org/works/W3023550073.grobid-xml"},"referenced_works_count":14,"referenced_works":["https://openalex.org/W22865276","https://openalex.org/W1969937884","https://openalex.org/W1975282432","https://openalex.org/W2028880308","https://openalex.org/W2060022598","https://openalex.org/W2072489003","https://openalex.org/W2083194870","https://openalex.org/W2093525562","https://openalex.org/W2163009692","https://openalex.org/W2163993204","https://openalex.org/W2175083358","https://openalex.org/W2298908048","https://openalex.org/W2321327828","https://openalex.org/W2999214452"],"related_works":["https://openalex.org/W2357191878","https://openalex.org/W1997078944","https://openalex.org/W1968065688","https://openalex.org/W1552846815","https://openalex.org/W2142945567","https://openalex.org/W4289829835","https://openalex.org/W2030332364","https://openalex.org/W2005459225","https://openalex.org/W4220830676","https://openalex.org/W2917961983"],"abstract_inverted_index":{"In":[0],"this":[1,126],"paper,":[2],"we":[3,89,114],"propose":[4],"a":[5],"density":[6,11,40,95,123,132,145],"estimation":[7,41,96,146],"system":[8,75,97,109,118,127],"of":[9,19,23,38,57,85,147,152],"user":[10,131],"at":[12,47,133,156],"the":[13,31,35,39,48,51,55,64,70,74,79,86,94,104,107,117,134,144],"closed":[14,32,135],"space":[15,33,49,148,153],"using":[16,154],"high":[17,52,65],"frequencies":[18,27,53,66],"speaker":[20,37],"and":[21,43,73,98,113,137,150],"microphone":[22,56],"smart":[24,44,61,80,100],"device.":[25,59],"High":[26],"are":[28],"sent":[29],"to":[30,69,103],"by":[34],"server":[36,71],"system,":[42,72,88],"devices":[45,62],"located":[46],"detect":[50],"via":[54],"each":[58],"The":[60],"detecting":[63],"send":[67],"data":[68,77],"calculates":[76],"from":[78],"devices.":[81,101],"To":[82],"evaluate":[83],"performance":[84],"proposed":[87,108],"did":[90],"some":[91],"experiments":[92],"with":[93],"20":[99],"According":[102],"test":[105],"results,":[106],"showed":[110],"96.5%":[111],"accuracy,":[112],"confirm":[115],"that":[116],"is":[119],"very":[120],"useful":[121,141],"for":[122,143],"estimation.":[124],"Therefore,":[125],"can":[128],"precisely":[129],"estimate":[130],"space,":[136],"it":[138],"could":[139],"be":[140],"technology":[142],"users":[149],"measurement":[151],"state":[155],"indoor":[157],"space.":[158]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1}],"updated_date":"2026-05-06T08:25:59.206177","created_date":"2025-10-10T00:00:00"}
