{"id":"https://openalex.org/W3164576244","doi":"https://doi.org/10.3390/s21113630","title":"Using High-Frequency Information and RH to Estimate AQI Based on SVR","display_name":"Using High-Frequency Information and RH to Estimate AQI Based on SVR","publication_year":2021,"publication_date":"2021-05-23","ids":{"openalex":"https://openalex.org/W3164576244","doi":"https://doi.org/10.3390/s21113630","mag":"3164576244","pmid":"https://pubmed.ncbi.nlm.nih.gov/34071076"},"language":"en","primary_location":{"id":"doi:10.3390/s21113630","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21113630","pdf_url":"https://www.mdpi.com/1424-8220/21/11/3630/pdf?version=1621767950","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj","pubmed"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://www.mdpi.com/1424-8220/21/11/3630/pdf?version=1621767950","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5004371889","display_name":"Jiun\u2010Jian Liaw","orcid":"https://orcid.org/0000-0002-0012-0227"},"institutions":[{"id":"https://openalex.org/I126145234","display_name":"Chaoyang University of Technology","ror":"https://ror.org/04xwksx09","country_code":"TW","type":"education","lineage":["https://openalex.org/I126145234"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Jiun-Jian Liaw","raw_affiliation_strings":["Department of Information and Communication Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 413310, Taiwan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Information and Communication Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 413310, Taiwan","institution_ids":["https://openalex.org/I126145234"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5115603153","display_name":"Kuan\u2010Yu Chen","orcid":"https://orcid.org/0000-0002-6036-2199"},"institutions":[{"id":"https://openalex.org/I126145234","display_name":"Chaoyang University of Technology","ror":"https://ror.org/04xwksx09","country_code":"TW","type":"education","lineage":["https://openalex.org/I126145234"]}],"countries":["TW"],"is_corresponding":true,"raw_author_name":"Kuan-Yu Chen","raw_affiliation_strings":["Department of Information and Communication Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 413310, Taiwan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Information and Communication Engineering, Chaoyang University of Technology, 168, Jifeng E. Rd., Wufeng District, Taichung 413310, Taiwan","institution_ids":["https://openalex.org/I126145234"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5115603153"],"corresponding_institution_ids":["https://openalex.org/I126145234"],"apc_list":{"value":2400,"currency":"CHF","value_usd":2673},"apc_paid":{"value":2400,"currency":"CHF","value_usd":2673},"fwci":0.5439,"has_fulltext":true,"cited_by_count":11,"citation_normalized_percentile":{"value":0.5748594,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":98},"biblio":{"volume":"21","issue":"11","first_page":"3630","last_page":"3630"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12120","display_name":"Air Quality Monitoring and Forecasting","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12120","display_name":"Air Quality Monitoring and Forecasting","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10689","display_name":"Remote-Sensing Image Classification","score":0.9955000281333923,"subfield":{"id":"https://openalex.org/subfields/2214","display_name":"Media Technology"},"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/T10766","display_name":"Urban Heat Island Mitigation","score":0.992900013923645,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/visibility","display_name":"Visibility","score":0.9421383142471313},{"id":"https://openalex.org/keywords/air-quality-index","display_name":"Air quality index","score":0.7186861634254456},{"id":"https://openalex.org/keywords/pixel","display_name":"Pixel","score":0.5851490497589111},{"id":"https://openalex.org/keywords/air-pollution","display_name":"Air pollution","score":0.5042234659194946},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.49535834789276123},{"id":"https://openalex.org/keywords/set","display_name":"Set (abstract data type)","score":0.4584150016307831},{"id":"https://openalex.org/keywords/region-of-interest","display_name":"Region of interest","score":0.44967132806777954},{"id":"https://openalex.org/keywords/environmental-science","display_name":"Environmental science","score":0.43781858682632446},{"id":"https://openalex.org/keywords/data-set","display_name":"Data set","score":0.4244837462902069},{"id":"https://openalex.org/keywords/meteorology","display_name":"Meteorology","score":0.33692800998687744},{"id":"https://openalex.org/keywords/remote-sensing","display_name":"Remote sensing","score":0.321120023727417},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.26273930072784424},{"id":"https://openalex.org/keywords/geography","display_name":"Geography","score":0.12914758920669556}],"concepts":[{"id":"https://openalex.org/C123403432","wikidata":"https://www.wikidata.org/wiki/Q654068","display_name":"Visibility","level":2,"score":0.9421383142471313},{"id":"https://openalex.org/C126314574","wikidata":"https://www.wikidata.org/wiki/Q2364111","display_name":"Air quality index","level":2,"score":0.7186861634254456},{"id":"https://openalex.org/C160633673","wikidata":"https://www.wikidata.org/wiki/Q355198","display_name":"Pixel","level":2,"score":0.5851490497589111},{"id":"https://openalex.org/C559116025","wikidata":"https://www.wikidata.org/wiki/Q131123","display_name":"Air pollution","level":2,"score":0.5042234659194946},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.49535834789276123},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.4584150016307831},{"id":"https://openalex.org/C19609008","wikidata":"https://www.wikidata.org/wiki/Q2138203","display_name":"Region of interest","level":2,"score":0.44967132806777954},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.43781858682632446},{"id":"https://openalex.org/C58489278","wikidata":"https://www.wikidata.org/wiki/Q1172284","display_name":"Data set","level":2,"score":0.4244837462902069},{"id":"https://openalex.org/C153294291","wikidata":"https://www.wikidata.org/wiki/Q25261","display_name":"Meteorology","level":1,"score":0.33692800998687744},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.321120023727417},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.26273930072784424},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.12914758920669556},{"id":"https://openalex.org/C178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","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/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0}],"mesh":[],"locations_count":5,"locations":[{"id":"doi:10.3390/s21113630","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21113630","pdf_url":"https://www.mdpi.com/1424-8220/21/11/3630/pdf?version=1621767950","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},{"id":"pmid:34071076","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/34071076","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors (Basel, Switzerland)","raw_type":null},{"id":"pmh:oai:doaj.org/article:bc254404227a4ee6940395bee3c907f9","is_oa":true,"landing_page_url":"https://doaj.org/article/bc254404227a4ee6940395bee3c907f9","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":"cc-by-sa","license_id":"https://openalex.org/licenses/cc-by-sa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors, Vol 21, Iss 11, p 3630 (2021)","raw_type":"article"},{"id":"pmh:oai:mdpi.com:/1424-8220/21/11/3630/","is_oa":true,"landing_page_url":"https://dx.doi.org/10.3390/s21113630","pdf_url":null,"source":{"id":"https://openalex.org/S4306400947","display_name":"MDPI (MDPI AG)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210097602","host_organization_name":"Multidisciplinary Digital Publishing Institute (Switzerland)","host_organization_lineage":["https://openalex.org/I4210097602"],"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":"Sensors; Volume 21; Issue 11; Pages: 3630","raw_type":"Text"},{"id":"pmh:oai:pubmedcentral.nih.gov:8197084","is_oa":true,"landing_page_url":"https://www.ncbi.nlm.nih.gov/pmc/articles/8197084","pdf_url":null,"source":{"id":"https://openalex.org/S2764455111","display_name":"PubMed Central","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"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":"Sensors (Basel)","raw_type":"Text"}],"best_oa_location":{"id":"doi:10.3390/s21113630","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21113630","pdf_url":"https://www.mdpi.com/1424-8220/21/11/3630/pdf?version=1621767950","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"sustainable_development_goals":[{"score":0.4099999964237213,"id":"https://metadata.un.org/sdg/15","display_name":"Life in Land"}],"awards":[],"funders":[],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3164576244.pdf","grobid_xml":"https://content.openalex.org/works/W3164576244.grobid-xml"},"referenced_works_count":36,"referenced_works":["https://openalex.org/W48880850","https://openalex.org/W75861454","https://openalex.org/W195739245","https://openalex.org/W1964357740","https://openalex.org/W1964940342","https://openalex.org/W1979755484","https://openalex.org/W1994347246","https://openalex.org/W1998050127","https://openalex.org/W2003010652","https://openalex.org/W2007178835","https://openalex.org/W2016659043","https://openalex.org/W2017388934","https://openalex.org/W2032799636","https://openalex.org/W2035527619","https://openalex.org/W2109349690","https://openalex.org/W2134726061","https://openalex.org/W2137226992","https://openalex.org/W2153114748","https://openalex.org/W2153567120","https://openalex.org/W2160866193","https://openalex.org/W2170892587","https://openalex.org/W2174335611","https://openalex.org/W2255698143","https://openalex.org/W2289128632","https://openalex.org/W2316206413","https://openalex.org/W2785180216","https://openalex.org/W2789245474","https://openalex.org/W2965681108","https://openalex.org/W3018779413","https://openalex.org/W3080766356","https://openalex.org/W3112411260","https://openalex.org/W3152849518","https://openalex.org/W3158353704","https://openalex.org/W6601993179","https://openalex.org/W6680532697","https://openalex.org/W6696332616"],"related_works":["https://openalex.org/W2991488401","https://openalex.org/W1603912562","https://openalex.org/W3080344894","https://openalex.org/W4318499393","https://openalex.org/W2066546759","https://openalex.org/W2733363865","https://openalex.org/W2082703639","https://openalex.org/W2019104286","https://openalex.org/W2512873846","https://openalex.org/W2120024962"],"abstract_inverted_index":{"The":[0,23,135,146,193],"Environmental":[1],"Protection":[2],"Administration":[3],"of":[4,47,63,132,149,173,189],"Taiwan\u2019s":[5],"Executive":[6],"Yuan":[7],"has":[8,114],"set":[9],"up":[10],"many":[11],"air":[12,18,33,36],"quality":[13,37],"monitoring":[14],"stations":[15],"to":[16,31,54,72,92,129,142,164,185,203],"monitor":[17],"pollution":[19],"in":[20,137,209],"the":[21,45,56,98,104,138,166,179,187,190,197],"environment.":[22],"current":[24],"weather":[25],"forecast":[26],"also":[27,115],"includes":[28],"information":[29,148],"used":[30,128,156,163,184,202],"predict":[32],"pollution.":[34],"Since":[35],"indicators":[38],"have":[39],"a":[40,48,60,68,77,117,210],"considerable":[41],"impact":[42],"on":[43],"people,":[44],"development":[46],"simple,":[49,211],"fast,":[50,212],"and":[51,85,123,152,213],"low-cost":[52,214],"method":[53,69,199],"measure":[55],"AQI":[57,86,99,154,169,205],"value":[58,100],"is":[59,103],"worthy":[61],"topic":[62],"research.":[64],"In":[65],"this":[66],"study,":[67],"was":[70,90,155,162,176],"proposed":[71,191,198],"estimate":[73,204],"AQI.":[74,82],"Visibility":[75],"had":[76],"clear":[78],"positive":[79],"relationship":[80],"with":[81,97,112,121,206],"When":[83],"images":[84,113],"were":[87,127,140,183],"compared,":[88],"it":[89],"easy":[91],"see":[93],"that":[94,196],"visibility":[95,111],"decreased":[96],"increase.":[101],"Distance":[102],"main":[105],"factor":[106],"affecting":[107],"visibility,":[108],"so":[109],"measuring":[110],"become":[116],"research":[118],"topic.":[119],"Images":[120],"high":[122],"low":[124],"PM2.5":[125],"concentrations":[126],"obtain":[130,143],"regions":[131],"interest":[133],"(RoI).":[134],"pixels":[136],"RoI":[139],"calculated":[141],"high-frequency":[144,147],"information.":[145],"RoI,":[150],"RH,":[151],"true":[153],"for":[157,168,178],"training":[158],"via":[159],"SVR,":[160],"which":[161],"generate":[165],"model":[167],"estimation.":[170],"One":[171],"year":[172],"experimental":[174],"samples":[175],"collected":[177],"experiment.":[180],"Two":[181],"indices":[182],"evaluate":[186],"performance":[188,208],"method.":[192],"results":[194],"showed":[195],"could":[200],"be":[201],"acceptable":[207],"way.":[215]},"counts_by_year":[{"year":2026,"cited_by_count":2},{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":2},{"year":2023,"cited_by_count":2},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":1}],"updated_date":"2026-07-22T07:51:19.307946","created_date":"2025-10-10T00:00:00"}