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Author Gutierrez, C.; Hurtado, C.A.; Mendelzon, A.O.; Perez, J. pdf  doi
openurl 
  Title Foundations of Semantic Web databases Type
  Year 2011 Publication Journal Of Computer And System Sciences Abbreviated Journal J. Comput. Syst. Sci.  
  Volume 77 Issue 3 Pages 520-541  
  Keywords Semantic Web; RDF model; Query language  
  Abstract The Semantic Web is based on the idea of a common and minimal language to enable large quantities of existing data to be analyzed and processed. This triggers the need to develop the database foundations of this basic language, which is the Resource Description Framework (RDF). This paper addresses this challenge by: 1) developing an abstract model and query language suitable to formalize and prove properties about the RDF data and query language; 2) studying the RDF data model, minimal and maximal representations, as well as normal forms; 3) studying systematically the complexity of entailment in the model, and proving complexity bounds for the main problems; 4) studying the notions of query answering and containment arising in the RDF data model; and 5) proving complexity bounds for query answering and query containment. (C) 2010 Elsevier Inc. All rights reserved.  
  Address [Gutierrez, Claudio] Univ Chile, Dept Comp Sci, Santiago, Chile, Email: cgutierr@dcc.uchile.cl  
  Corporate Author Thesis  
  Publisher Academic Press Inc Elsevier Science Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0022-0000 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000288474800006 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 129  
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Author Tachiquin, R.; Velazquez, R.; Del-Valle-Soto, C.; Gutierrez, C.A.; Carrasco, M.; De Fazio, R.; Trujillo-Leon, A.; Visconti, P.; Vidal-Verdu, F. doi  openurl
  Title Wearable Urban Mobility Assistive Device for Visually Impaired Pedestrians Using a Smartphone and a Tactile-Foot Interface Type
  Year 2021 Publication Abbreviated Journal  
  Volume 21 Issue 16 Pages 5274  
  Keywords assistive technology (AT); augmented GPS (A-GPS); navigation mobile app; outdoor orientation; tactile-foot interface; visually impaired pedestrians; urban mobility  
  Abstract This paper reports on the progress of a wearable assistive technology (AT) device designed to enhance the independent, safe, and efficient mobility of blind and visually impaired pedestrians in outdoor environments. Such device exploits the smartphone's positioning and computing capabilities to locate and guide users along urban settings. The necessary navigation instructions to reach a destination are encoded as vibrating patterns which are conveyed to the user via a foot-placed tactile interface. To determine the performance of the proposed AT device, two user experiments were conducted. The first one requested a group of 20 voluntary normally sighted subjects to recognize the feedback provided by the tactile-foot interface. The results showed recognition rates over 93%. The second experiment involved two blind voluntary subjects which were assisted to find target destinations along public urban pathways. Results show that the subjects successfully accomplished the task and suggest that blind and visually impaired pedestrians might find the AT device and its concept approach useful, friendly, fast to master, and easy to use.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1424-8220 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000690130600001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1457  
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