{"id":"https://openalex.org/W6889602082","doi":"https://doi.org/10.26174/thesis.lboro.21632669.v1","title":"Conjunctive queries for logic-based information extraction","display_name":"Conjunctive queries for logic-based information extraction","publication_year":2022,"publication_date":"2022-01-01","ids":{"openalex":"https://openalex.org/W6889602082","doi":"https://doi.org/10.26174/thesis.lboro.21632669.v1"},"language":"en","primary_location":{"id":"pmh:oai:figshare.com:article/21632669","is_oa":true,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4377196282","display_name":"Figshare","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210132348","host_organization_name":"Figshare (United Kingdom)","host_organization_lineage":["https://openalex.org/I4210132348"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Text"},"type":"article","indexed_in":["datacite"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":null,"any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Thompson, Sam M","orcid":"https://orcid.org/0000-0002-3476-6739"},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Thompson, Sam M","raw_affiliation_strings":[],"raw_orcid":"https://orcid.org/0000-0002-3476-6739","affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.27949024,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":true,"primary_topic":{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.17990000545978546,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"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/T10317","display_name":"Advanced Database Systems and Queries","score":0.17990000545978546,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"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/T10215","display_name":"Semantic Web and Ontologies","score":0.1378999948501587,"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/T10181","display_name":"Natural Language Processing Techniques","score":0.09809999912977219,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/conjunctive-query","display_name":"Conjunctive query","score":0.7465000152587891},{"id":"https://openalex.org/keywords/boolean-conjunctive-query","display_name":"Boolean conjunctive query","score":0.6833000183105469},{"id":"https://openalex.org/keywords/equivalence","display_name":"Equivalence (formal languages)","score":0.6064000129699707},{"id":"https://openalex.org/keywords/word","display_name":"Word (group theory)","score":0.517300009727478},{"id":"https://openalex.org/keywords/semantics","display_name":"Semantics (computer science)","score":0.47760000824928284},{"id":"https://openalex.org/keywords/conjunction","display_name":"Conjunction (astronomy)","score":0.47269999980926514},{"id":"https://openalex.org/keywords/context","display_name":"Context (archaeology)","score":0.44699999690055847},{"id":"https://openalex.org/keywords/binary-relation","display_name":"Binary relation","score":0.423799991607666},{"id":"https://openalex.org/keywords/query-language","display_name":"Query language","score":0.4140999913215637},{"id":"https://openalex.org/keywords/binary-number","display_name":"Binary number","score":0.39959999918937683}],"concepts":[{"id":"https://openalex.org/C65647387","wikidata":"https://www.wikidata.org/wiki/Q1781706","display_name":"Conjunctive query","level":3,"score":0.7465000152587891},{"id":"https://openalex.org/C24755975","wikidata":"https://www.wikidata.org/wiki/Q4943354","display_name":"Boolean conjunctive query","level":5,"score":0.6833000183105469},{"id":"https://openalex.org/C2780069185","wikidata":"https://www.wikidata.org/wiki/Q7977945","display_name":"Equivalence (formal languages)","level":2,"score":0.6064000129699707},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5396999716758728},{"id":"https://openalex.org/C90805587","wikidata":"https://www.wikidata.org/wiki/Q10944557","display_name":"Word (group theory)","level":2,"score":0.517300009727478},{"id":"https://openalex.org/C184337299","wikidata":"https://www.wikidata.org/wiki/Q1437428","display_name":"Semantics (computer science)","level":2,"score":0.47760000824928284},{"id":"https://openalex.org/C59656382","wikidata":"https://www.wikidata.org/wiki/Q191536","display_name":"Conjunction (astronomy)","level":2,"score":0.47269999980926514},{"id":"https://openalex.org/C2779343474","wikidata":"https://www.wikidata.org/wiki/Q3109175","display_name":"Context (archaeology)","level":2,"score":0.44699999690055847},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.42719998955726624},{"id":"https://openalex.org/C65180967","wikidata":"https://www.wikidata.org/wiki/Q130901","display_name":"Binary relation","level":2,"score":0.423799991607666},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.4205999970436096},{"id":"https://openalex.org/C192028432","wikidata":"https://www.wikidata.org/wiki/Q845739","display_name":"Query language","level":2,"score":0.4140999913215637},{"id":"https://openalex.org/C48372109","wikidata":"https://www.wikidata.org/wiki/Q3913","display_name":"Binary number","level":2,"score":0.39959999918937683},{"id":"https://openalex.org/C157692150","wikidata":"https://www.wikidata.org/wiki/Q2919848","display_name":"Query optimization","level":2,"score":0.39320001006126404},{"id":"https://openalex.org/C2776235265","wikidata":"https://www.wikidata.org/wiki/Q18392052","display_name":"Fragment (logic)","level":2,"score":0.3646000027656555},{"id":"https://openalex.org/C90119067","wikidata":"https://www.wikidata.org/wiki/Q43260","display_name":"Polynomial","level":2,"score":0.3531000018119812},{"id":"https://openalex.org/C311688","wikidata":"https://www.wikidata.org/wiki/Q2393193","display_name":"Time complexity","level":2,"score":0.3481999933719635},{"id":"https://openalex.org/C102993220","wikidata":"https://www.wikidata.org/wiki/Q387196","display_name":"Description logic","level":2,"score":0.34529998898506165},{"id":"https://openalex.org/C25343380","wikidata":"https://www.wikidata.org/wiki/Q277521","display_name":"Relation (database)","level":2,"score":0.31380000710487366},{"id":"https://openalex.org/C156103551","wikidata":"https://www.wikidata.org/wiki/Q130998","display_name":"Equivalence relation","level":2,"score":0.3125999867916107},{"id":"https://openalex.org/C69562738","wikidata":"https://www.wikidata.org/wiki/Q200694","display_name":"Propositional calculus","level":2,"score":0.3116999864578247},{"id":"https://openalex.org/C134752490","wikidata":"https://www.wikidata.org/wiki/Q374182","display_name":"Logical consequence","level":2,"score":0.30059999227523804},{"id":"https://openalex.org/C195807954","wikidata":"https://www.wikidata.org/wiki/Q1662562","display_name":"Information extraction","level":2,"score":0.2863999903202057},{"id":"https://openalex.org/C148230440","wikidata":"https://www.wikidata.org/wiki/Q1172264","display_name":"Datalog","level":2,"score":0.28529998660087585},{"id":"https://openalex.org/C16221470","wikidata":"https://www.wikidata.org/wiki/Q846564","display_name":"Conjunctive normal form","level":2,"score":0.28369998931884766},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.28279998898506165},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.2793000042438507},{"id":"https://openalex.org/C74640108","wikidata":"https://www.wikidata.org/wiki/Q1372900","display_name":"Propositional formula","level":5,"score":0.27489998936653137},{"id":"https://openalex.org/C156325763","wikidata":"https://www.wikidata.org/wiki/Q1930895","display_name":"Operational semantics","level":3,"score":0.2703999876976013},{"id":"https://openalex.org/C179799912","wikidata":"https://www.wikidata.org/wiki/Q205084","display_name":"Computational complexity theory","level":2,"score":0.26820001006126404},{"id":"https://openalex.org/C115988155","wikidata":"https://www.wikidata.org/wiki/Q3262192","display_name":"Decision problem","level":2,"score":0.25429999828338623},{"id":"https://openalex.org/C195818886","wikidata":"https://www.wikidata.org/wiki/Q5421724","display_name":"Expressive power","level":2,"score":0.2533999979496002},{"id":"https://openalex.org/C204321447","wikidata":"https://www.wikidata.org/wiki/Q30642","display_name":"Natural language processing","level":1,"score":0.2531000077724457}],"mesh":[],"locations_count":2,"locations":[{"id":"pmh:oai:figshare.com:article/21632669","is_oa":true,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4377196282","display_name":"Figshare","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210132348","host_organization_name":"Figshare (United Kingdom)","host_organization_lineage":["https://openalex.org/I4210132348"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Text"},{"id":"doi:10.26174/thesis.lboro.21632669.v1","is_oa":true,"landing_page_url":"https://doi.org/10.26174/thesis.lboro.21632669.v1","pdf_url":null,"source":{"id":"https://openalex.org/S4306402585","display_name":"Loughborough University Research Repository (Loughborough University)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I143804889","host_organization_name":"Loughborough University","host_organization_lineage":["https://openalex.org/I143804889"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":null,"raw_source_name":null,"raw_type":"article-journal"}],"best_oa_location":{"id":"pmh:oai:figshare.com:article/21632669","is_oa":true,"landing_page_url":null,"pdf_url":null,"source":{"id":"https://openalex.org/S4377196282","display_name":"Figshare","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210132348","host_organization_name":"Figshare (United Kingdom)","host_organization_lineage":["https://openalex.org/I4210132348"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Text"},"sustainable_development_goals":[{"display_name":"Peace, Justice and strong institutions","id":"https://metadata.un.org/sdg/16","score":0.7253611087799072}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":[],"abstract_inverted_index":{"This":[0,170,262,351],"thesis":[1],"offers":[2],"two":[3],"logic-based":[4],"approaches":[5],"to":[6,57,84,173,255,348,354,364,380],"conjunctive":[7,24,376,392],"queries":[8,377,393],"in":[9,82,164,241,270],"the":[10,21,28,49,55,58,76,91,150,156,176,192,209,257,264,289,296,307,319,336,344,361,382],"context":[11],"of":[12,23,27,60,80,98,102,158,178,186,191,203,237,260,267,288,306,329,338],"information":[13],"extraction.":[14],"The":[15,138,251],"first":[16,73],"and":[17,31,36,95,112,129,134,144,208,218,342,402],"main":[18],"approach":[19,253],"is":[20,40,66,146,152,167,211,216,248,254,346,407],"introduction":[22],"query":[25,92,201,210,340],"fragments":[26,97],"logics":[29],"FC":[30,39,67,180],"FC[REG],":[32],"denoted":[33],"as":[34,110,132],"FC-CQ":[35,128,143,151,166,231,235],"FC[REG]-CQ":[37,81,99,130,145],"respectively.":[38],"a":[41,184,200,271,275,278,293,339,367],"first-order":[42,312,404],"logic":[43,313,362,405],"based":[44,359],"on":[45,360],"word":[46,162,181,188,206,239],"equations,":[47],"where":[48,160,322],"semantics":[50],"are":[51,136,378,395],"defined":[52],"by":[53],"limiting":[54],"universe":[56,276,290],"factors":[59],"some":[61,101],"finite":[62],"input":[63],"word.":[64],"FC[REG]":[65],"extended":[68],"with":[69,105,277,282],"regular":[70,113],"constraints.":[71],"Our":[72],"results":[74,222],"consider":[75,256],"comparative":[77],"expressive":[78,398,409],"power":[79],"relation":[83],"document":[85],"spanners":[86],"(a":[87],"formal":[88],"framework":[89],"for":[90,127,142,298,302],"language":[93,107],"AQL),":[94],"various":[96],"\u2013":[100,154],"which":[103],"coincide":[104],"well-known":[106],"generators,":[108],"such":[109,370],"patterns":[111],"expressions.":[114],"Then,":[115,285],"we":[116,219,317,373,388],"look":[117,174],"at":[118,175,311],"decision":[119,125],"problems.":[120],"We":[121,224],"show":[122,374,389],"that":[123,228,246,303,375,390],"many":[124],"problems":[126],"(such":[131],"equivalence":[133],"regularity)":[135],"undecidable.":[137],"model":[139,214],"checking":[140,215],"problem":[141],"NP-complete":[147],"even":[148],"if":[149,295],"acyclic":[153,234],"under":[155],"definition":[157],"acyclicity":[159],"each":[161,286,328],"equation":[163,182],"an":[165,168,179,226,230,233,371],"atom.":[169],"leads":[171],"us":[172],"\u201cdecomposition\u201d":[177],"into":[183,232],"conjunction":[185],"binary":[187,205,238],"equations":[189,207,240],"(i.e.,":[190],"form":[193],"x":[194],"=\u02d9":[195],"y":[196],"\u00b7":[197],"z).":[198],"If":[199],"consists":[202],"only":[204,332],"acyclic,":[212],"then":[213],"tractable":[217],"can":[220,291,324],"enumerate":[221],"efficiently.":[223],"give":[225],"algorithm":[227],"decomposes":[229],"consisting":[236],"polynomial":[242],"time,":[243],"or":[244],"determines":[245],"this":[247],"not":[249],"possible.":[250],"second":[252],"dynamic":[258,320,355,391,403],"complexity":[259,357],"FC.":[261],"uses":[263],"common":[265],"way":[266],"encoding":[268],"words":[269],"relational":[272],"structure":[273],"using":[274],"linear":[279],"order":[280],"along":[281],"symbol":[283,294,300],"predicates.":[284],"element":[287],"carry":[292],"predicate":[297],"said":[299],"holds":[301],"element.":[304],"Instead":[305],"\u201cusual":[308],"way\u201d":[309],"(looking":[310],"over":[314],"these":[315,330],"structures),":[316],"study":[318],"complexity,":[321],"symbols":[323],"be":[325,349],"modified.":[326],"As":[327],"modifications":[331],"changes":[333],"one":[334],"position,":[335],"result":[337],"before":[341],"after":[343],"modification":[345],"likely":[347],"related.":[350],"gives":[352],"rise":[353],"descriptive":[356],"classes":[358],"needed":[363],"incrementally":[365],"maintain":[366,381],"query.":[368],"For":[369],"approach,":[372],"sufficient":[379],"so-called":[383],"core":[384,400,412],"spanners.":[385,413],"In":[386],"fact,":[387],"(DynCQ)":[394],"actually":[396],"more":[397,408],"than":[399,410],"spanners,":[401],"(DynFO)":[406],"generalized":[411]},"counts_by_year":[],"updated_date":"2025-11-06T06:51:31.235846","created_date":"2025-10-10T00:00:00"}
