{"id":"https://openalex.org/W3038581437","doi":"https://doi.org/10.1587/transinf.2019edp7238","title":"Sparsity Reduction Technique Using Grouping Method for Matrix Factorization in Differentially Private Recommendation Systems","display_name":"Sparsity Reduction Technique Using Grouping Method for Matrix Factorization in Differentially Private Recommendation Systems","publication_year":2020,"publication_date":"2020-06-30","ids":{"openalex":"https://openalex.org/W3038581437","doi":"https://doi.org/10.1587/transinf.2019edp7238","mag":"3038581437"},"language":"en","primary_location":{"id":"doi:10.1587/transinf.2019edp7238","is_oa":true,"landing_page_url":"https://doi.org/10.1587/transinf.2019edp7238","pdf_url":"https://www.jstage.jst.go.jp/article/transinf/E103.D/7/E103.D_2019EDP7238/_pdf","source":{"id":"https://openalex.org/S2486202937","display_name":"IEICE Transactions on Information and Systems","issn_l":"0916-8532","issn":["0916-8532","1745-1361"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4320800604","host_organization_name":"Institute of Electronics, Information and Communication Engineers","host_organization_lineage":["https://openalex.org/P4320800604"],"host_organization_lineage_names":["Institute of Electronics, Information and Communication Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEICE Transactions on Information and Systems","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"diamond","oa_url":"https://www.jstage.jst.go.jp/article/transinf/E103.D/7/E103.D_2019EDP7238/_pdf","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5101736516","display_name":"Taewhan Kim","orcid":"https://orcid.org/0000-0003-2376-4970"},"institutions":[{"id":"https://openalex.org/I148751991","display_name":"Sogang University","ror":"https://ror.org/056tn4839","country_code":"KR","type":"education","lineage":["https://openalex.org/I148751991"]}],"countries":["KR"],"is_corresponding":true,"raw_author_name":"Taewhan KIM","raw_affiliation_strings":["Department of Computer Science and Engineering, Sogang University"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, Sogang University","institution_ids":["https://openalex.org/I148751991"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5076006367","display_name":"Kangsoo Jung","orcid":"https://orcid.org/0000-0003-2070-1050"},"institutions":[{"id":"https://openalex.org/I148751991","display_name":"Sogang University","ror":"https://ror.org/056tn4839","country_code":"KR","type":"education","lineage":["https://openalex.org/I148751991"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Kangsoo JUNG","raw_affiliation_strings":["Department of Computer Science and Engineering, Sogang University"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, Sogang University","institution_ids":["https://openalex.org/I148751991"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5090186230","display_name":"Seog Park","orcid":"https://orcid.org/0000-0002-4049-7950"},"institutions":[{"id":"https://openalex.org/I148751991","display_name":"Sogang University","ror":"https://ror.org/056tn4839","country_code":"KR","type":"education","lineage":["https://openalex.org/I148751991"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Seog PARK","raw_affiliation_strings":["Department of Computer Science and Engineering, Sogang University"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science and Engineering, Sogang University","institution_ids":["https://openalex.org/I148751991"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5101736516"],"corresponding_institution_ids":["https://openalex.org/I148751991"],"apc_list":null,"apc_paid":null,"fwci":0.1359,"has_fulltext":true,"cited_by_count":3,"citation_normalized_percentile":{"value":0.54762681,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":95},"biblio":{"volume":"E103.D","issue":"7","first_page":"1683","last_page":"1692"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10764","display_name":"Privacy-Preserving Technologies in Data","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10764","display_name":"Privacy-Preserving Technologies in Data","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11045","display_name":"Privacy, Security, and Data Protection","score":0.9959999918937683,"subfield":{"id":"https://openalex.org/subfields/3312","display_name":"Sociology and Political Science"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T10203","display_name":"Recommender Systems and Techniques","score":0.9937000274658203,"subfield":{"id":"https://openalex.org/subfields/1710","display_name":"Information Systems"},"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":0.8547530174255371},{"id":"https://openalex.org/keywords/differential-privacy","display_name":"Differential privacy","score":0.7668412923812866},{"id":"https://openalex.org/keywords/recommender-system","display_name":"Recommender system","score":0.7182171940803528},{"id":"https://openalex.org/keywords/personally-identifiable-information","display_name":"Personally identifiable information","score":0.5822746157646179},{"id":"https://openalex.org/keywords/information-retrieval","display_name":"Information retrieval","score":0.5316938161849976},{"id":"https://openalex.org/keywords/private-information-retrieval","display_name":"Private information retrieval","score":0.5155041813850403},{"id":"https://openalex.org/keywords/user-information","display_name":"User information","score":0.505214512348175},{"id":"https://openalex.org/keywords/identification","display_name":"Identification (biology)","score":0.4185205101966858},{"id":"https://openalex.org/keywords/data-mining","display_name":"Data mining","score":0.3725571632385254},{"id":"https://openalex.org/keywords/information-system","display_name":"Information system","score":0.3470708131790161},{"id":"https://openalex.org/keywords/computer-security","display_name":"Computer security","score":0.2345326542854309}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8547530174255371},{"id":"https://openalex.org/C23130292","wikidata":"https://www.wikidata.org/wiki/Q5275358","display_name":"Differential privacy","level":2,"score":0.7668412923812866},{"id":"https://openalex.org/C557471498","wikidata":"https://www.wikidata.org/wiki/Q554950","display_name":"Recommender system","level":2,"score":0.7182171940803528},{"id":"https://openalex.org/C169093310","wikidata":"https://www.wikidata.org/wiki/Q3702971","display_name":"Personally identifiable information","level":2,"score":0.5822746157646179},{"id":"https://openalex.org/C23123220","wikidata":"https://www.wikidata.org/wiki/Q816826","display_name":"Information retrieval","level":1,"score":0.5316938161849976},{"id":"https://openalex.org/C99221444","wikidata":"https://www.wikidata.org/wiki/Q1532069","display_name":"Private information retrieval","level":2,"score":0.5155041813850403},{"id":"https://openalex.org/C2777622855","wikidata":"https://www.wikidata.org/wiki/Q7901844","display_name":"User information","level":3,"score":0.505214512348175},{"id":"https://openalex.org/C116834253","wikidata":"https://www.wikidata.org/wiki/Q2039217","display_name":"Identification (biology)","level":2,"score":0.4185205101966858},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.3725571632385254},{"id":"https://openalex.org/C180198813","wikidata":"https://www.wikidata.org/wiki/Q121182","display_name":"Information system","level":2,"score":0.3470708131790161},{"id":"https://openalex.org/C38652104","wikidata":"https://www.wikidata.org/wiki/Q3510521","display_name":"Computer security","level":1,"score":0.2345326542854309},{"id":"https://openalex.org/C59822182","wikidata":"https://www.wikidata.org/wiki/Q441","display_name":"Botany","level":1,"score":0.0},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C119599485","wikidata":"https://www.wikidata.org/wiki/Q43035","display_name":"Electrical engineering","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1587/transinf.2019edp7238","is_oa":true,"landing_page_url":"https://doi.org/10.1587/transinf.2019edp7238","pdf_url":"https://www.jstage.jst.go.jp/article/transinf/E103.D/7/E103.D_2019EDP7238/_pdf","source":{"id":"https://openalex.org/S2486202937","display_name":"IEICE Transactions on Information and Systems","issn_l":"0916-8532","issn":["0916-8532","1745-1361"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4320800604","host_organization_name":"Institute of Electronics, Information and Communication Engineers","host_organization_lineage":["https://openalex.org/P4320800604"],"host_organization_lineage_names":["Institute of Electronics, Information and Communication Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEICE Transactions on Information and Systems","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.1587/transinf.2019edp7238","is_oa":true,"landing_page_url":"https://doi.org/10.1587/transinf.2019edp7238","pdf_url":"https://www.jstage.jst.go.jp/article/transinf/E103.D/7/E103.D_2019EDP7238/_pdf","source":{"id":"https://openalex.org/S2486202937","display_name":"IEICE Transactions on Information and Systems","issn_l":"0916-8532","issn":["0916-8532","1745-1361"],"is_oa":true,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4320800604","host_organization_name":"Institute of Electronics, Information and Communication Engineers","host_organization_lineage":["https://openalex.org/P4320800604"],"host_organization_lineage_names":["Institute of Electronics, Information and Communication Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEICE Transactions on Information and Systems","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G3034753964","display_name":null,"funder_award_id":"grant","funder_id":"https://openalex.org/F4320320671","funder_display_name":"National Research Foundation"},{"id":"https://openalex.org/G342704958","display_name":null,"funder_award_id":"funded","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G3942910960","display_name":null,"funder_award_id":"(NRF) grant","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G4310451945","display_name":null,"funder_award_id":"2017R1D1A1B0303","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G4900121520","display_name":null,"funder_award_id":"NRF-2017R1D1A1B","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G5022978564","display_name":null,"funder_award_id":"NRF-2017R1D1A1B0303","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G5853768159","display_name":null,"funder_award_id":"2017-0-00498","funder_id":"https://openalex.org/F4320335489","funder_display_name":"Institute for Information and Communications Technology Promotion"},{"id":"https://openalex.org/G6072120315","display_name":null,"funder_award_id":"funded","funder_id":"https://openalex.org/F4320335489","funder_display_name":"Institute for Information and Communications Technology Promotion"},{"id":"https://openalex.org/G6316855684","display_name":null,"funder_award_id":"NRF-2017R1D1A1B03036252","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G982292920","display_name":null,"funder_award_id":"NRF-20","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"}],"funders":[{"id":"https://openalex.org/F4320320671","display_name":"National Research Foundation","ror":"https://ror.org/05s0g1g46"},{"id":"https://openalex.org/F4320322120","display_name":"National Research Foundation of Korea","ror":"https://ror.org/013aysd81"},{"id":"https://openalex.org/F4320328359","display_name":"Ministry of Science and ICT, South Korea","ror":"https://ror.org/01wpjm123"},{"id":"https://openalex.org/F4320335489","display_name":"Institute for Information and Communications Technology Promotion","ror":"https://ror.org/01g0hqq23"}],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3038581437.pdf","grobid_xml":"https://content.openalex.org/works/W3038581437.grobid-xml"},"referenced_works_count":14,"referenced_works":["https://openalex.org/W1873763122","https://openalex.org/W1893900968","https://openalex.org/W2013823004","https://openalex.org/W2022097286","https://openalex.org/W2054141820","https://openalex.org/W2070786785","https://openalex.org/W2083287929","https://openalex.org/W2109426455","https://openalex.org/W2123147099","https://openalex.org/W2135930857","https://openalex.org/W2167094273","https://openalex.org/W2186434094","https://openalex.org/W2396511432","https://openalex.org/W2789607830"],"related_works":["https://openalex.org/W2290534421","https://openalex.org/W4366460314","https://openalex.org/W2508667469","https://openalex.org/W1598015880","https://openalex.org/W4285356634","https://openalex.org/W2102182846","https://openalex.org/W1984904811","https://openalex.org/W2596305496","https://openalex.org/W118448456","https://openalex.org/W2995499270"],"abstract_inverted_index":{"Web":[0],"service":[1],"users":[2,133],"are":[3],"overwhelmed":[4],"by":[5],"the":[6,18,36,83,92,107,122,143,153,160,183,219],"amount":[7],"of":[8,38,109,116,124,145,162,185],"information":[9,19,46,67,176],"presented":[10],"to":[11,51,99,165,181,217,223],"them":[12],"and":[13,47,71,134,222,228,238],"have":[14],"difficulties":[15],"in":[16,68,95,148,159,246],"finding":[17],"that":[20,27,79,211],"they":[21,103,196],"need.":[22],"Therefore,":[23,127,152],"a":[24,75,128,206,214],"recommendation":[25,41,69,100,166,209],"system":[26],"predicts":[28],"users'":[29,44],"taste":[30],"is":[31,118],"an":[32,249],"essential":[33],"factor":[34],"for":[35,132],"success":[37],"businesses.":[39],"However,":[40,86],"systems":[42,70,189],"require":[43],"personal":[45,66],"can":[48],"thus":[49],"lead":[50],"serious":[52],"privacy":[53,76,98,164,239],"violations.":[54],"To":[55],"solve":[56,218],"this":[57,202],"problem,":[58],"many":[59],"research":[60],"has":[61],"been":[62],"conducted":[63],"about":[64],"protecting":[65,173],"implementing":[72],"differential":[73,97,163],"privacy,":[74],"protection":[77,240],"technique":[78,234],"inserts":[80],"noise":[81],"into":[82],"original":[84],"data.":[85],"previous":[87,169],"studies":[88,170],"did":[89,104,178],"not":[90,105,179],"examine":[91],"following":[93],"factors":[94],"applying":[96],"systems.":[101,167],"First,":[102],"consider":[106],"sparsity":[108,154,220],"user":[110,146,174,199,229],"rating":[111,129,149,175,230,244],"information.":[112,231],"The":[113,232],"total":[114],"number":[115,123],"items":[117,135],"much":[119],"more":[120],"than":[121],"user-rated":[125,186,225],"items.":[126,187],"matrix":[130],"created":[131],"will":[136],"be":[137,157],"very":[138],"sparse.":[139],"This":[140],"characteristic":[141],"renders":[142],"identification":[144],"patterns":[147],"matrixes":[150],"difficult.":[151],"issue":[155,221],"should":[156,190],"considered":[158],"application":[161],"Second,":[168],"focused":[171],"on":[172,213,241],"but":[177],"aim":[180],"protect":[182,191,224],"lists":[184,194,227],"Recommendation":[188],"these":[192],"item":[193,226],"because":[195],"also":[197],"disclose":[198],"preferences.":[200],"In":[201],"study,":[203],"we":[204],"propose":[205],"differentially":[207],"private":[208],"scheme":[210],"bases":[212],"grouping":[215],"method":[216],"proposed":[233],"shows":[235],"better":[236],"performance":[237],"actual":[242],"movie":[243],"data":[245],"comparison":[247],"with":[248],"existing":[250],"technique.":[251]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1},{"year":2022,"cited_by_count":1}],"updated_date":"2026-04-10T15:06:20.359241","created_date":"2025-10-10T00:00:00"}