{"id":"https://openalex.org/W1966767672","doi":"https://doi.org/10.1145/2187980.2188058","title":"H2RDF","display_name":"H2RDF","publication_year":2012,"publication_date":"2012-04-16","ids":{"openalex":"https://openalex.org/W1966767672","doi":"https://doi.org/10.1145/2187980.2188058","mag":"1966767672"},"language":"en","primary_location":{"id":"doi:10.1145/2187980.2188058","is_oa":false,"landing_page_url":"https://doi.org/10.1145/2187980.2188058","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the 21st International Conference on World Wide Web","raw_type":"proceedings-article"},"type":"conference-paper","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"http://doi.org/10.1145/2187980.2188058","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5032003787","display_name":"Nikolaos Papailiou","orcid":"https://orcid.org/0000-0001-6030-2762"},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Nikolaos Papailiou","raw_affiliation_strings":["Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","institution_ids":["https://openalex.org/I174458059"]},{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#","institution_ids":["https://openalex.org/I174458059"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5004421134","display_name":"Ioannis Konstantinou","orcid":"https://orcid.org/0000-0002-7142-8106"},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Ioannis Konstantinou","raw_affiliation_strings":["Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","institution_ids":["https://openalex.org/I174458059"]},{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#","institution_ids":["https://openalex.org/I174458059"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5005628435","display_name":"Dimitrios Tsoumakos","orcid":"https://orcid.org/0000-0003-4420-8949"},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Dimitrios Tsoumakos","raw_affiliation_strings":["Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","institution_ids":["https://openalex.org/I174458059"]},{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#","institution_ids":["https://openalex.org/I174458059"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5023526161","display_name":"Nectarios Koziris","orcid":"https://orcid.org/0000-0002-4890-8427"},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]}],"countries":["GR"],"is_corresponding":false,"raw_author_name":"Nectarios Koziris","raw_affiliation_strings":["Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece","institution_ids":["https://openalex.org/I174458059"]},{"raw_affiliation_string":"Computing Systems Laboratory, School of ECE, National Technical University of Athens, Athens, Greece#TAB#","institution_ids":["https://openalex.org/I174458059"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I174458059"],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":false,"cited_by_count":121,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"397","last_page":"400"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11106","display_name":"Data Management and Algorithms","score":0.996999979019165,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"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/T11106","display_name":"Data Management and Algorithms","score":0.996999979019165,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"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/T10317","display_name":"Advanced Database Systems and Queries","score":0.9962999820709229,"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":0.9957000017166138,"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/computer-science","display_name":"Computer science","score":0.9036444425582886},{"id":"https://openalex.org/keywords/joins","display_name":"Joins","score":0.8864200115203857},{"id":"https://openalex.org/keywords/scalability","display_name":"Scalability","score":0.7840688824653625},{"id":"https://openalex.org/keywords/sparql","display_name":"SPARQL","score":0.7056105136871338},{"id":"https://openalex.org/keywords/join","display_name":"Join (topology)","score":0.606146514415741},{"id":"https://openalex.org/keywords/nosql","display_name":"NoSQL","score":0.5626224279403687},{"id":"https://openalex.org/keywords/rdf","display_name":"RDF","score":0.5047911405563354},{"id":"https://openalex.org/keywords/database","display_name":"Database","score":0.4736146628856659},{"id":"https://openalex.org/keywords/distributed-computing","display_name":"Distributed computing","score":0.4361634850502014},{"id":"https://openalex.org/keywords/simple","display_name":"Simple (philosophy)","score":0.4145134389400482},{"id":"https://openalex.org/keywords/information-retrieval","display_name":"Information retrieval","score":0.2112513780593872},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.12198808789253235},{"id":"https://openalex.org/keywords/semantic-web","display_name":"Semantic Web","score":0.12150758504867554}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.9036444425582886},{"id":"https://openalex.org/C2778692605","wikidata":"https://www.wikidata.org/wiki/Q4041866","display_name":"Joins","level":2,"score":0.8864200115203857},{"id":"https://openalex.org/C48044578","wikidata":"https://www.wikidata.org/wiki/Q727490","display_name":"Scalability","level":2,"score":0.7840688824653625},{"id":"https://openalex.org/C41009113","wikidata":"https://www.wikidata.org/wiki/Q54871","display_name":"SPARQL","level":4,"score":0.7056105136871338},{"id":"https://openalex.org/C2776124973","wikidata":"https://www.wikidata.org/wiki/Q3183033","display_name":"Join (topology)","level":2,"score":0.606146514415741},{"id":"https://openalex.org/C2779599972","wikidata":"https://www.wikidata.org/wiki/Q82231","display_name":"NoSQL","level":3,"score":0.5626224279403687},{"id":"https://openalex.org/C147497476","wikidata":"https://www.wikidata.org/wiki/Q54872","display_name":"RDF","level":3,"score":0.5047911405563354},{"id":"https://openalex.org/C77088390","wikidata":"https://www.wikidata.org/wiki/Q8513","display_name":"Database","level":1,"score":0.4736146628856659},{"id":"https://openalex.org/C120314980","wikidata":"https://www.wikidata.org/wiki/Q180634","display_name":"Distributed computing","level":1,"score":0.4361634850502014},{"id":"https://openalex.org/C2780586882","wikidata":"https://www.wikidata.org/wiki/Q7520643","display_name":"Simple (philosophy)","level":2,"score":0.4145134389400482},{"id":"https://openalex.org/C23123220","wikidata":"https://www.wikidata.org/wiki/Q816826","display_name":"Information retrieval","level":1,"score":0.2112513780593872},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.12198808789253235},{"id":"https://openalex.org/C2129575","wikidata":"https://www.wikidata.org/wiki/Q54837","display_name":"Semantic Web","level":2,"score":0.12150758504867554},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.0},{"id":"https://openalex.org/C111472728","wikidata":"https://www.wikidata.org/wiki/Q9471","display_name":"Epistemology","level":1,"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/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1145/2187980.2188058","is_oa":false,"landing_page_url":"https://doi.org/10.1145/2187980.2188058","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the 21st International Conference on World Wide Web","raw_type":"proceedings-article"},{"id":"pmh:oai:dspace.lib.ntua.gr:123456789/36469","is_oa":true,"landing_page_url":"http://doi.org/10.1145/2187980.2188058","pdf_url":null,"source":{"id":"https://openalex.org/S4377196837","display_name":"DSpace - NTUA (National Technical University of Athens)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I174458059","host_organization_name":"National Technical University of Athens","host_organization_lineage":["https://openalex.org/I174458059"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"WWW'12 - Proceedings of the 21st Annual Conference on World Wide Web Companion","raw_type":"info:eu-repo/semantics/conferenceObject"}],"best_oa_location":{"id":"pmh:oai:dspace.lib.ntua.gr:123456789/36469","is_oa":true,"landing_page_url":"http://doi.org/10.1145/2187980.2188058","pdf_url":null,"source":{"id":"https://openalex.org/S4377196837","display_name":"DSpace - NTUA (National Technical University of Athens)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I174458059","host_organization_name":"National Technical University of Athens","host_organization_lineage":["https://openalex.org/I174458059"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"WWW'12 - Proceedings of the 21st Annual Conference on World Wide Web Companion","raw_type":"info:eu-repo/semantics/conferenceObject"},"sustainable_development_goals":[{"display_name":"Decent work and economic growth","id":"https://metadata.un.org/sdg/8","score":0.5899999737739563}],"awards":[],"funders":[{"id":"https://openalex.org/F4320320300","display_name":"European Commission","ror":"https://ror.org/00k4n6c32"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":13,"referenced_works":["https://openalex.org/W1495014783","https://openalex.org/W1578906473","https://openalex.org/W1989009626","https://openalex.org/W2034103898","https://openalex.org/W2089247435","https://openalex.org/W2101491706","https://openalex.org/W2102440263","https://openalex.org/W2113582899","https://openalex.org/W2135577024","https://openalex.org/W2137152505","https://openalex.org/W2169080911","https://openalex.org/W2173213060","https://openalex.org/W6903180130"],"related_works":["https://openalex.org/W3097775534","https://openalex.org/W3147541650","https://openalex.org/W2615202182","https://openalex.org/W4206665951","https://openalex.org/W3085073370","https://openalex.org/W2904139343","https://openalex.org/W2529794967","https://openalex.org/W2393491644","https://openalex.org/W650102067","https://openalex.org/W2966995102"],"abstract_inverted_index":{"In":[0,118],"this":[1,119],"work":[2],"we":[3,121],"present":[4],"H2RDF,":[5],"a":[6,18,91,157],"fully":[7],"distributed":[8,20,64,101],"RDF":[9],"store":[10],"that":[11,29,48],"combines":[12],"the":[13,123,176,183,189,196,200],"MapReduce":[14],"processing":[15,32],"framework":[16],"with":[17],"NoSQL":[19],"data":[21,185,197],"store.":[22],"Our":[23,72],"system":[24,73],"features":[25],"two":[26],"unique":[27],"characteristics":[28],"enable":[30],"efficient":[31],"of":[33,44,94,143,160,178,192],"both":[34,76,195],"simple":[35,77],"and":[36,58,63,79,83,105,167,199],"multi-join":[37,104],"SPARQL":[38,139],"queries":[39,82,107,140,155],"on":[40,141],"virtually":[41],"unlimited":[42],"number":[43,159],"triples:":[45],"Join":[46],"algorithms":[47],"execute":[49,135],"joins":[50,78],"according":[51],"to":[52,55,86,112,134,174],"query":[53,70],"selectivity":[54],"reduce":[56],"processing;":[57],"adaptive":[59],"choice":[60],"among":[61],"centralized":[62,113],"(MapReduce-based)":[65],"join":[66,148],"execution":[67,180],"for":[68],"fast":[69],"responses.":[71],"efficiently":[74],"answers":[75],"complex":[80],"multivariate":[81],"easily":[84],"scales":[85],"3":[87],"billion":[88],"triples":[89],"using":[90,146],"small":[92],"cluster":[93,161,165],"9":[95],"worker":[96,202],"nodes.":[97],"H2RDF":[98,193],"outperforms":[99],"state-of-the-art":[100],"solutions":[102,114],"in":[103,115],"nonselective":[106],"while":[108],"achieving":[109],"comparable":[110],"performance":[111],"selective":[116],"queries.":[117],"demonstration":[120],"showcase":[122],"system's":[124],"functionality":[125],"through":[126],"an":[127],"interactive":[128],"GUI.":[129],"Users":[130],"will":[131,171],"be":[132,172],"able":[133,173],"predefined":[136],"or":[137],"custom-made":[138],"datasets":[142],"different":[144,147,158,179],"sizes,":[145],"algorithms.":[149],"Moreover,":[150],"they":[151],"can":[152],"repeat":[153],"all":[154],"utilizing":[156],"resources.":[162,203],"Using":[163],"real-time":[164],"monitoring":[166],"detailed":[168],"statistics,":[169],"participants":[170],"understand":[175],"advantages":[177],"schemes":[181],"versus":[182],"input":[184],"as":[186,188],"well":[187],"scalability":[190],"properties":[191],"over":[194],"size":[198],"available":[201]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":4},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":6},{"year":2020,"cited_by_count":7},{"year":2019,"cited_by_count":7},{"year":2018,"cited_by_count":11},{"year":2017,"cited_by_count":11},{"year":2016,"cited_by_count":17},{"year":2015,"cited_by_count":15},{"year":2014,"cited_by_count":23},{"year":2013,"cited_by_count":12},{"year":2012,"cited_by_count":4}],"updated_date":"2026-07-14T23:27:15.235271","created_date":"2016-06-24T00:00:00"}
