{"id":"https://openalex.org/W2116274755","doi":"https://doi.org/10.1109/percom.2011.5767597","title":"uDirect: A novel approach for pervasive observation of user direction with mobile phones","display_name":"uDirect: A novel approach for pervasive observation of user direction with mobile phones","publication_year":2011,"publication_date":"2011-03-01","ids":{"openalex":"https://openalex.org/W2116274755","doi":"https://doi.org/10.1109/percom.2011.5767597","mag":"2116274755"},"language":"en","primary_location":{"id":"doi:10.1109/percom.2011.5767597","is_oa":false,"landing_page_url":"https://doi.org/10.1109/percom.2011.5767597","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2011 IEEE International Conference on Pervasive Computing and Communications (PerCom)","raw_type":"proceedings-article"},"type":"conference-paper","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/A5082598720","display_name":"Seyed Amir Hoseinitabatabaei","orcid":"https://orcid.org/0000-0002-0716-3908"},"institutions":[{"id":"https://openalex.org/I28290843","display_name":"University of Surrey","ror":"https://ror.org/00ks66431","country_code":"GB","type":"education","lineage":["https://openalex.org/I28290843"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Seyed Amir Hoseinitabatabaei","raw_affiliation_strings":["Center for Communication Systems Research, University of Surrey, Guildford, UK","Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, UK","institution_ids":["https://openalex.org/I28290843"]},{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#","institution_ids":["https://openalex.org/I28290843"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5112625241","display_name":"Alexander Gluhak","orcid":null},"institutions":[{"id":"https://openalex.org/I28290843","display_name":"University of Surrey","ror":"https://ror.org/00ks66431","country_code":"GB","type":"education","lineage":["https://openalex.org/I28290843"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Alexander Gluhak","raw_affiliation_strings":["Center for Communication Systems Research, University of Surrey, Guildford, UK","Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, UK","institution_ids":["https://openalex.org/I28290843"]},{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#","institution_ids":["https://openalex.org/I28290843"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5032549075","display_name":"Rahim Tafazolli","orcid":"https://orcid.org/0000-0002-6062-8639"},"institutions":[{"id":"https://openalex.org/I28290843","display_name":"University of Surrey","ror":"https://ror.org/00ks66431","country_code":"GB","type":"education","lineage":["https://openalex.org/I28290843"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Rahim Tafazolli","raw_affiliation_strings":["Center for Communication Systems Research, University of Surrey, Guildford, UK","Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, UK","institution_ids":["https://openalex.org/I28290843"]},{"raw_affiliation_string":"Center for Communication Systems Research, University of Surrey, Guildford, GU2 7JN, United Kingdom#TAB#","institution_ids":["https://openalex.org/I28290843"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I28290843"],"apc_list":null,"apc_paid":null,"fwci":6.2651,"has_fulltext":false,"cited_by_count":28,"citation_normalized_percentile":{"value":0.97450229,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":90,"max":99},"biblio":{"volume":null,"issue":null,"first_page":"74","last_page":"83"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10326","display_name":"Indoor and Outdoor Localization Technologies","score":0.9998000264167786,"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":0.9998000264167786,"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/T10444","display_name":"Context-Aware Activity Recognition Systems","score":0.9905999898910522,"subfield":{"id":"https://openalex.org/subfields/1707","display_name":"Computer Vision and Pattern Recognition"},"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/T11980","display_name":"Human Mobility and Location-Based Analysis","score":0.9900000095367432,"subfield":{"id":"https://openalex.org/subfields/3313","display_name":"Transportation"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/accelerometer","display_name":"Accelerometer","score":0.8285598754882812},{"id":"https://openalex.org/keywords/orientation","display_name":"Orientation (vector space)","score":0.7378224730491638},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.7252111434936523},{"id":"https://openalex.org/keywords/global-positioning-system","display_name":"Global Positioning System","score":0.7180847525596619},{"id":"https://openalex.org/keywords/mobile-phone","display_name":"Mobile phone","score":0.5053234696388245},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.49431681632995605},{"id":"https://openalex.org/keywords/magnetometer","display_name":"Magnetometer","score":0.47394683957099915},{"id":"https://openalex.org/keywords/acceleration","display_name":"Acceleration","score":0.47178006172180176},{"id":"https://openalex.org/keywords/phase","display_name":"Phase (matter)","score":0.4473443031311035},{"id":"https://openalex.org/keywords/phone","display_name":"Phone","score":0.434641033411026},{"id":"https://openalex.org/keywords/real-time-computing","display_name":"Real-time computing","score":0.38979649543762207},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.3721071779727936},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.3548945188522339},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.11942994594573975},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.07363644242286682}],"concepts":[{"id":"https://openalex.org/C89805583","wikidata":"https://www.wikidata.org/wiki/Q192940","display_name":"Accelerometer","level":2,"score":0.8285598754882812},{"id":"https://openalex.org/C16345878","wikidata":"https://www.wikidata.org/wiki/Q107472979","display_name":"Orientation (vector space)","level":2,"score":0.7378224730491638},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7252111434936523},{"id":"https://openalex.org/C60229501","wikidata":"https://www.wikidata.org/wiki/Q18822","display_name":"Global Positioning System","level":2,"score":0.7180847525596619},{"id":"https://openalex.org/C2777421447","wikidata":"https://www.wikidata.org/wiki/Q17517","display_name":"Mobile phone","level":2,"score":0.5053234696388245},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.49431681632995605},{"id":"https://openalex.org/C153946474","wikidata":"https://www.wikidata.org/wiki/Q333921","display_name":"Magnetometer","level":3,"score":0.47394683957099915},{"id":"https://openalex.org/C117896860","wikidata":"https://www.wikidata.org/wiki/Q11376","display_name":"Acceleration","level":2,"score":0.47178006172180176},{"id":"https://openalex.org/C44280652","wikidata":"https://www.wikidata.org/wiki/Q104837","display_name":"Phase (matter)","level":2,"score":0.4473443031311035},{"id":"https://openalex.org/C2778707766","wikidata":"https://www.wikidata.org/wiki/Q202064","display_name":"Phone","level":2,"score":0.434641033411026},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.38979649543762207},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.3721071779727936},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.3548945188522339},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.11942994594573975},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.07363644242286682},{"id":"https://openalex.org/C74650414","wikidata":"https://www.wikidata.org/wiki/Q11397","display_name":"Classical mechanics","level":1,"score":0.0},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.0},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.0},{"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/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.0},{"id":"https://openalex.org/C115260700","wikidata":"https://www.wikidata.org/wiki/Q11408","display_name":"Magnetic field","level":2,"score":0.0},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.1109/percom.2011.5767597","is_oa":false,"landing_page_url":"https://doi.org/10.1109/percom.2011.5767597","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2011 IEEE International Conference on Pervasive Computing and Communications (PerCom)","raw_type":"proceedings-article"},{"id":"pmh:oai:alma.44SUR_INST:11139412220002346","is_oa":false,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4210197018","display_name":"View","issn_l":"2688-268X","issn":["2688-268X","2688-3988"],"is_oa":false,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"","raw_type":""},{"id":"pmh:oai:epubs.surrey.ac.uk:805510","is_oa":false,"landing_page_url":"http://epubs.surrey.ac.uk/805510/1/uDirect-v2%20%282%29.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306400680","display_name":"Surrey Research Insight Open Access (The University of Surrey)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I28290843","host_organization_name":"University of Surrey","host_organization_lineage":["https://openalex.org/I28290843"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Conference or Workshop Item"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/16","score":0.6299999952316284,"display_name":"Peace, Justice and strong institutions"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":33,"referenced_works":["https://openalex.org/W175891030","https://openalex.org/W418709959","https://openalex.org/W1482049143","https://openalex.org/W1507712797","https://openalex.org/W1606643854","https://openalex.org/W1899364738","https://openalex.org/W1982434105","https://openalex.org/W2025755794","https://openalex.org/W2055104126","https://openalex.org/W2060371114","https://openalex.org/W2098362174","https://openalex.org/W2100045296","https://openalex.org/W2101803280","https://openalex.org/W2108512685","https://openalex.org/W2111355799","https://openalex.org/W2112146163","https://openalex.org/W2117811484","https://openalex.org/W2120863707","https://openalex.org/W2121459188","https://openalex.org/W2129813476","https://openalex.org/W2129912474","https://openalex.org/W2135067781","https://openalex.org/W2138135354","https://openalex.org/W2138636377","https://openalex.org/W2172135120","https://openalex.org/W2277786500","https://openalex.org/W2532881485","https://openalex.org/W3148244168","https://openalex.org/W4233222313","https://openalex.org/W4234782453","https://openalex.org/W6607157301","https://openalex.org/W6639712047","https://openalex.org/W6678110751"],"related_works":["https://openalex.org/W2765080098","https://openalex.org/W2385749422","https://openalex.org/W2009888974","https://openalex.org/W2355290145","https://openalex.org/W2353465659","https://openalex.org/W3023105672","https://openalex.org/W2355539379","https://openalex.org/W2074940407","https://openalex.org/W4231410700","https://openalex.org/W2112493694"],"abstract_inverted_index":{"In":[0,117],"this":[1],"paper":[2],"we":[3],"present":[4],"the":[5,24,36,50,71,79,83,94,105,128,136,148,155,159],"uDirect":[6],"algorithm":[7,72,95,137,177],"as":[8,115],"a":[9,18,60,172],"novel":[10],"approach":[11],"for":[12,66,89,163,188],"mobile":[13,106],"phone":[14],"centric":[15],"observation":[16],"of":[17,53,59,75,78,87,104,126,150,158,181],"user's":[19],"facing":[20],"direction,":[21],"through":[22],"which":[23,81],"device":[25,37,80],"and":[26,44,101,183],"user":[27,68,84],"orientations":[28],"relative":[29],"to":[30,112,132],"earth":[31],"coordinate":[32],"are":[33],"estimated.":[34],"While":[35],"orientation":[38,77],"estimation":[39],"is":[40,64,73,109,130],"based":[41,174,186],"on":[42,98,175],"accelerometer":[43,100],"magnetometer":[45,102],"measurements":[46],"in":[47],"standing":[48],"mode,":[49],"unique":[51,156],"behavior":[52],"measured":[54],"acceleration":[55],"during":[56,123],"stance":[57,161],"phase":[58,162],"human's":[61],"walking":[62,127,189],"cycle":[63],"used":[65],"detecting":[67],"direction.":[69],"Furthermore,":[70],"independent":[74,121],"initial":[76,168],"gives":[82],"higher":[85],"space":[86],"freedom":[88],"long":[90],"term":[91],"observations.":[92],"As":[93],"only":[96],"relies":[97],"embedded":[99],"sensors":[103],"phone,":[107],"it":[108],"not":[110],"susceptible":[111],"shadowing":[113],"effect":[114],"GPS.":[116],"addition,":[118],"by":[119],"performing":[120],"estimations":[122],"each":[124],"step":[125],"model":[129,153],"robust":[131],"error":[133],"accumulation.":[134],"Evaluating":[135],"with":[138],"180":[139],"data":[140],"samples":[141],"from":[142],"10":[143],"participates":[144],"has":[145,170],"empirically":[146],"confirmed":[147],"assumptions":[149],"our":[151,167,176],"analytical":[152],"about":[154],"characteristics":[157],"human":[160],"direction":[164],"estimation.":[165],"Moreover,":[166],"inspection":[169],"shown":[171],"system":[173],"outperforms":[178],"conventional":[179],"use":[180],"GPS":[182],"PCA":[184],"analysis":[185],"techniques":[187],"distances":[190],"more":[191],"than":[192],"2":[193],"steps.":[194]},"counts_by_year":[{"year":2022,"cited_by_count":2},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":1},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":4},{"year":2014,"cited_by_count":4},{"year":2013,"cited_by_count":7},{"year":2012,"cited_by_count":3}],"updated_date":"2026-07-29T14:22:42.915294","created_date":"2025-10-10T00:00:00"}