{"id":"https://openalex.org/W2035470678","doi":"https://doi.org/10.1007/bf01582875","title":"Uneven distribution of ventilation\u2014perfusion ratios in lungs estimated by a modified Newton method","display_name":"Uneven distribution of ventilation\u2014perfusion ratios in lungs estimated by a modified Newton method","publication_year":1991,"publication_date":"1991-05-01","ids":{"openalex":"https://openalex.org/W2035470678","doi":"https://doi.org/10.1007/bf01582875","mag":"2035470678"},"language":"en","primary_location":{"id":"doi:10.1007/bf01582875","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf01582875","pdf_url":null,"source":{"id":"https://openalex.org/S193920097","display_name":"Mathematical Programming","issn_l":"0025-5610","issn":["0025-5610","1436-4646"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Programming","raw_type":"journal-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/A5076345883","display_name":"Takeo Kawashiro","orcid":null},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]},{"id":"https://openalex.org/I4210107168","display_name":"Keio University Hospital","ror":"https://ror.org/01k8ej563","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210107168"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Takeo Kawashiro","raw_affiliation_strings":["Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","Department of Medicine, School of Medicine, Keio University, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103","https://openalex.org/I4210107168"]},{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5043596628","display_name":"Fumihiro Yamasawa","orcid":"https://orcid.org/0000-0001-6315-8479"},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]},{"id":"https://openalex.org/I4210107168","display_name":"Keio University Hospital","ror":"https://ror.org/01k8ej563","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210107168"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Fumihiro Yamasawa","raw_affiliation_strings":["Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","Department of Medicine, School of Medicine, Keio University, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103","https://openalex.org/I4210107168"]},{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5047992278","display_name":"Yasumasa Okada","orcid":"https://orcid.org/0000-0003-4774-8684"},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]},{"id":"https://openalex.org/I4210107168","display_name":"Keio University Hospital","ror":"https://ror.org/01k8ej563","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210107168"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Yasumasa Okada","raw_affiliation_strings":["Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","Department of Medicine, School of Medicine, Keio University, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103","https://openalex.org/I4210107168"]},{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5056002586","display_name":"Hirosuke Kobayashi","orcid":null},"institutions":[{"id":"https://openalex.org/I203951103","display_name":"Keio University","ror":"https://ror.org/02kn6nx58","country_code":"JP","type":"education","lineage":["https://openalex.org/I203951103"]},{"id":"https://openalex.org/I4210107168","display_name":"Keio University Hospital","ror":"https://ror.org/01k8ej563","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210107168"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Hirosuke Kobayashi","raw_affiliation_strings":["Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","Department of Medicine, School of Medicine, Keio University, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Shinano-machi, Shinjuku-ku, 160, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103","https://openalex.org/I4210107168"]},{"raw_affiliation_string":"Department of Medicine, School of Medicine, Keio University, Tokyo, Japan","institution_ids":["https://openalex.org/I203951103"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5111956089","display_name":"Kunio Tanabe","orcid":null},"institutions":[{"id":"https://openalex.org/I4210134673","display_name":"The Institute of Statistical Mathematics","ror":"https://ror.org/03jcejr58","country_code":"JP","type":"facility","lineage":["https://openalex.org/I1319490839","https://openalex.org/I4210134673","https://openalex.org/I4210158934"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Kunio Tanabe","raw_affiliation_strings":["The Institute of Statistical Mathematics, 4-6-7 Minami-Azabum Minato-ku, 106, Tokyo, Japan","The Institute of Statistical Mathematics, Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"The Institute of Statistical Mathematics, 4-6-7 Minami-Azabum Minato-ku, 106, Tokyo, Japan","institution_ids":["https://openalex.org/I4210134673"]},{"raw_affiliation_string":"The Institute of Statistical Mathematics, Tokyo, Japan","institution_ids":["https://openalex.org/I4210134673"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":2890,"currency":"USD","value_usd":2890},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.10709654,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"52","issue":"1-3","first_page":"1","last_page":"9"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10322","display_name":"Respiratory Support and Mechanisms","score":0.9925000071525574,"subfield":{"id":"https://openalex.org/subfields/2740","display_name":"Pulmonary and Respiratory Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10322","display_name":"Respiratory Support and Mechanisms","score":0.9925000071525574,"subfield":{"id":"https://openalex.org/subfields/2740","display_name":"Pulmonary and Respiratory Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11700","display_name":"Hemodynamic Monitoring and Therapy","score":0.9918000102043152,"subfield":{"id":"https://openalex.org/subfields/2746","display_name":"Surgery"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10143","display_name":"Chronic Obstructive Pulmonary Disease (COPD) Research","score":0.986299991607666,"subfield":{"id":"https://openalex.org/subfields/2740","display_name":"Pulmonary and Respiratory Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/smoothing","display_name":"Smoothing","score":0.5767189264297485},{"id":"https://openalex.org/keywords/weighting","display_name":"Weighting","score":0.49498313665390015},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.4894019663333893},{"id":"https://openalex.org/keywords/distribution","display_name":"Distribution (mathematics)","score":0.4879719614982605},{"id":"https://openalex.org/keywords/ventilation","display_name":"Ventilation (architecture)","score":0.4492895305156708},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.41509079933166504},{"id":"https://openalex.org/keywords/applied-mathematics","display_name":"Applied mathematics","score":0.38413485884666443},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.36560022830963135},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.35678625106811523},{"id":"https://openalex.org/keywords/mathematical-analysis","display_name":"Mathematical analysis","score":0.3014078140258789},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.25558924674987793},{"id":"https://openalex.org/keywords/thermodynamics","display_name":"Thermodynamics","score":0.1709122359752655}],"concepts":[{"id":"https://openalex.org/C3770464","wikidata":"https://www.wikidata.org/wiki/Q775963","display_name":"Smoothing","level":2,"score":0.5767189264297485},{"id":"https://openalex.org/C183115368","wikidata":"https://www.wikidata.org/wiki/Q856577","display_name":"Weighting","level":2,"score":0.49498313665390015},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.4894019663333893},{"id":"https://openalex.org/C110121322","wikidata":"https://www.wikidata.org/wiki/Q865811","display_name":"Distribution (mathematics)","level":2,"score":0.4879719614982605},{"id":"https://openalex.org/C200457457","wikidata":"https://www.wikidata.org/wiki/Q584049","display_name":"Ventilation (architecture)","level":2,"score":0.4492895305156708},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.41509079933166504},{"id":"https://openalex.org/C28826006","wikidata":"https://www.wikidata.org/wiki/Q33521","display_name":"Applied mathematics","level":1,"score":0.38413485884666443},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.36560022830963135},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.35678625106811523},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.3014078140258789},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.25558924674987793},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.1709122359752655},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/bf01582875","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf01582875","pdf_url":null,"source":{"id":"https://openalex.org/S193920097","display_name":"Mathematical Programming","issn_l":"0025-5610","issn":["0025-5610","1436-4646"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Programming","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W58737682","https://openalex.org/W1787652680","https://openalex.org/W1879303347","https://openalex.org/W1986939523","https://openalex.org/W1993152017","https://openalex.org/W2000382273","https://openalex.org/W2028503162","https://openalex.org/W2053419780","https://openalex.org/W2066069559","https://openalex.org/W2095973298","https://openalex.org/W2133936382","https://openalex.org/W2175133747","https://openalex.org/W2229993205","https://openalex.org/W2289587704","https://openalex.org/W2487741461","https://openalex.org/W6666777128"],"related_works":["https://openalex.org/W2180954594","https://openalex.org/W2052835778","https://openalex.org/W2049003611","https://openalex.org/W2127804977","https://openalex.org/W2108418243","https://openalex.org/W164103134","https://openalex.org/W2787352659","https://openalex.org/W1970611213","https://openalex.org/W4206560911","https://openalex.org/W4372260270"],"abstract_inverted_index":null,"counts_by_year":[{"year":2020,"cited_by_count":1}],"updated_date":"2026-07-23T08:03:31.855105","created_date":"2025-10-10T00:00:00"}