VAGELIS HRISTIDIS (also Evangelos Christidis)

Dept. of Computer Science and Engineering
University of California, Riverside
Riverside, CA 92521
office tel.: +1 951 827-2478
Home Page: http://www.cs.ucr.edu/~vagelis

EDUCATION

Ph.D. in Computer Science, August 2004
 (Advisor: Prof. Yannis Papakonstaninou)
University of California, San Diego

M.S. in Computer Science, December 2000
University of California, San Diego
 
B.S. in Electrical Engneering & Computer Science, 1999
National Technical University of Athens

WORK EXPERIENCE

Professor, 2015-present
Dept. of Computer Science and Engineering
University of California, Riverside

Associate Professor, 2011-2015
Dept. of Computer Science and Engineering
University of California, Riverside

Associate Professor, 2010-2011
School of Computing and Information Sciences
Florida International University
 
Assistant Professor, 2004-2010
School of Computing and Information Sciences
Florida International University
 
Intern at Microsoft Research, Redmond, Summer 2003
Worked with Surajit Chaudhuri and Gautam Das on Automatically Ranking the Results of Queries. Studied and developed solutions for the problem.
 
DIMACS Scholar, Summer 2002
AT&T Labs-Research, Florham Park NJ
Worked with Nick Koudas and Divesh Srivastava on Keyword Search in XML.
 
Software Developer, 1997-1998
Worked for Syndesis Ltd in the development of CASE tools for fuzzy logic. Created the data schema specifications and implemented various software modules using Visual C++.

HONORS AND AWARDS

AWARDED GRANTS

  1. NSF IIS-2227669- $600K, 1/2023-12/2025
    Role: PI (co-PI: Yihan Sun)
    Title: III: Small: Rethinking the Data Organization and Lifecycle in LSM Storage Systems
  2. NSF IIS-1901379- $1.2M, 8/2019-7/2023
    Role: PI (co-PIs: Amit-Roy Chowdhury, Vagelis Papalexakis, Vassilis Tsotras, Konstantinos Karydis)
    Title: III: Medium: Efficient Collaborative Perception over Controllable Agent Networks
  3. NSF IIS-1838222 - $2.7M (including $750K AWS credit; UCR: $1.35M, UCI: $650K), 1/2019-12/2022
    Role: Lead PI of Collaborative Grant (co-PIs: Ahmed Eldawy, Vassilis Tsotras, Mike Carey (UCI))
    Title: BIGDATA: F: Collaborative Research: Optimizing Log-Structured-Merge-Based Big Data Management Systems
  4. NSF IIS-1746031 - $232,000, 8/2017-12/2019
    Role: PI (co-PIs: Amit-Roy Chowdhury, Vagelis Papalexakis, Vassilis Tsotras)
    Title: EAGER: Joint Modeling and Querying of Social Media and Video Data
  5. NSF III-1619463 - $500,000, 7/2016-6/2020
    Role: sole co-PI (PI: Neal Young)
    Title: III: Small: Increase the Throughput of Non-Relational Databases through Theoretical Modeling and Optimization
  6. NSF IIS-1447826 - $750,000, 9/2014-8/2019
    Role: sole co-PI (PI: V. Tsotras)
    Title: BIGDATA: F: DKM: Collaborative Research: Making Big Data Active: From Petabytes to Megafolks in Milliseconds
  7. NSF IIP-1448848 - $225,000, 1/2015-12/2015
    Role: sole co-PI (PI: M. Wiley)
    Title: STTR Phase I: A Social and Data-Driven Platform for Searching Healthcare Providers
  8. Intelligence Advanced Research Projects Activity (IARPA). $352,372, 8/2014-7/2015
    Role: PI (co-PIs: Amit Roy-Chowdhury, Harsha Madhyastha, Vassilis Tsotras)
    Title: Spatiotemporal Investigative Exploration of Large-Scale Social Networking Data
  9. UCR $72K 5/2014-4/2015
    Role: co-PI (PI: Miguel Angel Aragon Calvo)
    Title: Scientific discoveries in the age of Big Data: The case for a Big Data Center!
    UCR Collaborative Seed Grant Program
  10. Samsung Research Award. $100K/year, start: 2/2014
    Role: PI (co-PI: Laxmi Bhuyan)
    Title: IO Optimizations for Bigdata Stores
  11. DTRA HDTRA1-13-C-0078 - $480,692, 10/2013-4/2015
    Role: co-PI (PI: Harsha Madhyastha)
    Title: Leveraging Online Social Networks for Early Detection of Agricultural Bioterrorism
    Defense Threat Reduction Agency (DTRA)
  12. UCR $60K 9/2013-8/2014
    Role: co-PI (PI: K. Esterling)
    Title: The Role of, and Opportunities for, Online Social Media in Diabetes Care
    UCR Collaborative Seed Grant Program
  13. NSF CNS#1126619 - $678K, active from 9/1/2011 to 8/31/2014
    Role: co-PI (PI: Naphtali Rishe)
    Title: MRI: Development of an Integrated, Geospatial Analytics Research Instrument
    National Science Foundation, Division of Computer and Network Systems
  14. IBM Scalable Data Analytics for A Smarter Planet Innovation Award, $20K, awarded in 10/2010
    Role: co-PI (PI: Tao Li)
    Title: Knowledge Discovery and Information Delivery for Disaster Management
  15. Google Research Award, $70K, awarded in 8/2010
    Role: PI (co-PI Panos Ipeirotis)
    Title: Collaborative Adaptive Data Sharing
  16. NSF IIS# 0952347 - $525K, active from 4/2010 to 3/2015
    Role: sole PI
    Title: CAREER: A Collaborative Adaptive Data Sharing Platform
    National Science Foundation, Division of Information & Intelligent Systems
  17. NSF IIS# 0811922 - $366K, active from 9/2008 to 8/2011
    Role: sole PI
    Title: III-CXT-Small: Information Discovery on Domain Data Graphs
    National Science Foundation, Division of Information & Intelligent Systems
  18. DHS 2009-ST-062-000016 - $200K, active from 5/2009 to 4/2011
    Role: PI (co-PI: Tao Li)
    Title: Information Delivery and Knowledge Discovery for Hurricane Disaster Management
    Department of Homeland Security
  19. NSF CNS# 0821345 - $1M, active from 8/2008 to 7/2013
    Role: co-PI (PI: Naphtali Rishe)
    Title: MRI: Development of a High-Performance Database Appliance for Geospatial Applications
    National Science Foundation, Division of Computer and Network Systems
  20. NSF IIS# 0837716 - $150K, active from 6/2008 to 12/2009
    Role: co-PI (PI: Naphtali Rishe)
    Title: Investigation of Geospatial Data Management on MapReduce Platform
    National Science Foundation, Division of Industrial Innovation and Partnerships
  21. NSF IIP# 0829576 - $140K, active from 7/2008 to 7/2010
    Role: co-PI (PI: Naphtali Rishe)
    Title: Center for Advanced Knowledge Enablement
    National Science Foundation, Division of Industrial Innovation and Partnerships
  22. NSF HRD-0833093 - $1.5M, active from 9/1/08-8/31/13
    Role: co-PI (PI: Naphtali Rishe)
    Title: Subproject 1: Effective Access to Complex Multimodal Data with Applications in Disaster Management
    National Science Foundation, Division of Human Resource Development
  23. NSF IIS# 0534530 - $396K (excluding Supplements), active from 1/2006 to 12/2008
    Role: sole co-PI (PI: Raju Rangaswami)
    Title: Building Efficient, Native Storage Systems for Semi-structured Data
    National Science Foundation, Division of Information & Intelligent Systems
  24. NSF I/UCRC #0630322 - $10K, active from 9/1/2006 to 8/31/2007
    Role: co-PI (PI: Naphtali Rishe)
    Title: Collaborative Research: Science of Search: Data Search, Analytics, and Architectures Center (DSAAC)
    National Science Foundation, Directorate of Engineering
  25. Kauffman Foundation of Entrepreneurship- $10K, active from 2/1/2008 to 2/1/2009
    Role: sole PI
    Title: Effective Search on Patent Databases
  26. FIU Faculty Research Award- $12K, active from 6/1/2008 to 6/1/2009
    Role: sole PI
    Title: Effective Search on Patent Databases

PUBLICATIONS

The key scientific disciplines where I am actively publishing are: Databases, Information Retrieval, Data Mining and Health Informatics

Books
  1. Vagelis Hristidis. Information Discovery on Electronic Health Records. CRC - Taylor & Francis, December 2009 (also co-authored 4 chapters), ISBN: 9781420090383, ISBN 10: 1420090380
Conferences/Workshops
  1. Muhammad Shihab Rashid, Jannat Ara Meem and Vagelis Hristidis. NORMY: Non-Uniform History Modeling for Open Retrieval Conversational Question Answering. IEEE International Conference on Semantic Computing (ICSC) 2024
  2. Qizhong Mao, Vagelis Hristidis. Increase Merge Efficiency in LSM Trees Through Coordinated Partitioning of Sorted Runs. IEEE International Conference on Big Data in 2023 (short-paper, acceptance rate 38%)
  3. Xin Zhang, Qizhong Mao, Ahmed Eldawy, Vagelis Hristidis and Yihan Sun. Bi-directional Log-Structured Merge Tree. 34th International Conference on Scientific and Statistical Database Management, short paper (SSDBM 2022)
  4. M.H. Maqbool, Luxun Xu, A.B. Siddique, Niloofar Montazeri, Vagelis Hristidis, Hassan Foroosh. Zero-label Anaphora Resolution for Off-Script User Queries in Goal-Oriented Dialog Systems. IEEE International Conference on Semantic Computing (ICSC) 2022
  5. Tin Vu, Ahmed Eldawy, Vagelis Hristidis, Vassilis J. Tsotras. Incremental Partitioning for Efficient Spatial Data Analytics. Proceedings of the VLDB Endowment (PVLDB) 2022 (full research paper)
  6. Ahmed Eldawy, Vagelis Hristidis, Saheli Ghosh, Majid Saeedan, Akil Sevim, A.B. Siddique, Samriddhi Singla, Ganesh Sivaram, Tin Vu and Yaming Zhang. Beast: Scalable Exploratory Analytics on Spatio-temporal Data. ACM Conference on Information and Knowledge Management (CIKM) 2021 (full paper, applied track, acceptance rate 24%)
  7. Muhammad Shihab Rashid, Fuad Jamour and Vagelis Hristidis. QuAX: Mining the Web for High-utility FAQ. ACM Conference on Information and Knowledge Management (CIKM) 2021 (full paper, acceptance rate 21.7%)
  8. A.B. Siddique, Fuad Jamour, Luxun Xu, and Vagelis Hristidis. Generalized Zero-shot Intent Detection via Commonsense Knowledge. ACM SIGIR Conference on Research and Development in Information Retrieval 2021, Short Paper track (acceptance rate 27.6%)
  9. A.B. Siddique, Fuad Jamour and Vagelis Hristidis. Linguistically-Enriched and Context-Aware Zero-shot Slot filling. The Web Conference 2021 (acceptance rate 20.6%)
  10. Nhat Le, A.B. Siddique, Fuad Jamour, Samet Oymak and Vagelis Hristidis. Predictable and Adaptive Goal-oriented Dialog Policy Generation. IEEE International Conference on Semantic Computing (ICSC) 2021 (best paper award)
  11. Umar Farooq, A.B. Siddique, Fuad Jamour, Zhijia Zhao, Vagelis Hristidis. App-Aware Response Synthesis for User Reviews. IEEE International Conference on Big Data in 2020 (full-paper, acceptance rate 15.5%)
  12. Qizhong Mao, Mohiuddin Abdul Qader, Vagelis Hristidis. Comprehensive Comparison of LSM Architectures for Spatial Data. IEEE International Conference on Big Data in 2020 (short-paper, acceptance rate 32%)
  13. A.B. Siddique, Samet Oymak, Vagelis Hristidis .Unsupervised Paraphrasing via Deep Reinforcement Learning. ACM SIGKDD (International Conference on Knowledge Discovery and Data Mining) 2020 (full paper, acceptance rate 16.8%)
  14. A.B. Siddique, Ahmed Eldawy, and Vagelis Hristidis. Euler++: An Improved Selectivity Estimation for Rectangular Spatial Records. IEEE Big Spatial Data Workshop (co-located with IEEE International Conference on Big Data) 2019
  15. Qizhong Mao, Steven Jacobs, Waleed Amjad, Vagelis Hristidis, Vassilis J. Tsotras, and Neal E. Young. Experimental Evaluation of Bounded-Depth LSM Merge Policies. IEEE International Conference on Big Data in 2019 (acceptance rate 19%)
  16. Luxun Xu, Vagelis Hristidis and Nhat Le. Clustering-based Summarization of Transactional Chatbot Logs. IEEE Humanized Computing and Communication. Laguna Hills, CA, 2019
  17. Nhat Le, Neal Young and Vagelis Hristidis. Unsupervised Ontology- and Sentiment-aware Review Summarization, International Conference on Web Information Systems Engineering (WISE), 2019 (acceptance rate 24.6%)
  18. Muhammad Abu Bakar Siddique, Ahmed Eldawy, Vagelis Hristidis. Comparing Synopsis Techniques for Approximate Spatial Data Analysis. Proceedings of the VLDB Endowment (PVLDB), Volume 12 Issue 11, July 2019, Pages 1583-1596 (full research paper)
  19. Moloud Shahbazi, Renee Garett, Vagelis Hristidis, Sean Young. Using Social Media to Explore Mental Health-Related Behaviors and Discussions among Young Adults. Hawaii International Conference on System Sciences 2019, 7 pages, http://hdl.handle.net/10125/59871
  20. Nhat Le, Ryan Rivas, James Flegal and Vagelis Hristidis. Targeted Solicitation of Product Reviews. 13th IEEE International Conference on Semantic Computing, pp. 308-315, January 2019 (acceptance rate 24.8%)
  21. Mohiuddin Abdul Qader, Shiwen Cheng, Vagelis Hristidis. A Comparative Study of Secondary Indexing Techniques in LSM-based NoSQL Databases. ACM SIGMOD International Conference on Management of Data (SIGMOD), pages 551-566 , 2018
  22. Mohiuddin Abdul Qader and Vagelis Hristidis. DualDB: An Efficient LSM-based Publish-Subscribe Storage System. International Conference on Scientific and Statistical Database Management (SSDBM) 2017
  23. Pritom Ahmed, Mahbub Hasan, Abhijith Kashyap, Vagelis Hristidis and Vassilis J. Tsotras. Efficient Computation of Top-k Frequent Terms over Spatial-Temporal Ranges. ACM SIGMOD International Conference on Management of Data (SIGMOD), pages 1227-1241, 2017
  24. Shiwen Cheng, Marek Chorbak, Vagelis Hristidis. Slowing the Firehose: Multi-Dimensional Diversity on Social Post Streams. International Conference on Extending Database Technology (EDBT), pages 17-28, 2016 (acceptance rate 27%)
  25. Moloud Shahbazi, Joseph R. Barr, Vagelis Hristidis and Nani Narayanan Srinivasan. Estimation of the Investability of Real Estate Properties Through Text Analysis. IEEE International Conference on Semantic Computing (ICSC) 2016 (full paper, acceptance rate 30%)
  26. Azade Nazi, Saravanan Thirumuruganathan, Vagelis Hristidis, Nan Zhang, Khaled Shaban, and Gautam Das. Query Hidden Attributes in Social Networks. Third International Workshop on Intelligent Data Processing (IDP), collocated with ICDM 2014
  27. Anastasios Zouzias, Vagelis Hristidis, Michail Vlachos. Templated Search over Relational Databases. ACM Conference on Information and Knowledge Management (CIKM) 2014 (full paper, acceptance rate 20%)
  28. Mahbub Hasan, Abhijith Kashyap, Vagelis Hristidis, Vassilis Tsotras. User Effort Minimization Through Adaptive Diversification. ACM SIGKDD (International Conference on Knowledge Discovery and Data Mining) 2014 (full paper, acceptance rate 14.6%)
  29. Saravanan Thirumuruganathan, Nan Zhang, Vagelis Hristidis, and Gautam Das, Aggregate Estimation Over a Microblog Platform, ACM SIGMOD International Conference on Management of Data, 2014 (full research paper)
  30. Eduardo Ruiz, Vagelis Hristidis, Panos Ipeirotis. Efficient Filtering on Hidden Document Streams. AAAI Conference on Weblogs and Social Media (ICWSM) 2014 full paper and long presentation, acceptance rate: 23%, long presentation acceptance rate: 8.8%)
  31. Shiwen Cheng, Anastasios Arvanitis, Marek Chrobak, Vagelis Hristidis. Multi-Query Diversification in Microblogging Posts. International Conference on Extending Database Technology (EDBT) 2014 (full paper, acceptance rate: 20%)
  32. Anastasios Arvanitis, Matthew Wiley, Vagelis Hristidis Efficient Concept-based Document Ranking. International Conference on Extending Database Technology (EDBT) 2014 (full paper, acceptance rate: 20%)
  33. X. Luo, W. Najjar, and V. Hristidis. Efficient Near-Duplicate Document Detection using FPGAs. Workshop on Benchmarks, Performance Optimization, and Emerging hardware of Big Data Systems and Applications (BPOE), in conjunction with IEEE International Conference on Big Data, 2013
  34. Shiwen Cheng, Vagelis Hristidis, Michael Weiner. Leveraging User Query Sessions to Improve Searching of Medical Literature. American Medical Informatics Association (AMIA) Annual Symposium 2013
  35. Shiwen Cheng, Anastasios Arvanitis, Vagelis Hristidis. How Fresh Do You Want Your Search Results? ACM Conference on Information and Knowledge Management (CIKM) 2013 (full paper, acceptance rate 16.9%)
  36. Mahashweta Das, Habibur Rahman, Gautam Das, Vagelis Hristidis. Generating Informative Snippet to Maximize Item Visibility. ACM Conference on Information and Knowledge Management (CIKM) 2013 (short paper, acceptance rate 29.4%)
  37. Eduardo Ruiz, Vagelis Hristidis, Carlos Castillo and Aristides Gionis. Measuring and Summarizing Movement in Microblog Postings. AAAI Conference on Weblogs and Social Media (ICWSM 2013) (acceptance rate 20%)
  38. Michael Butkiewicz, Zhe Wu, Shunan Li, Pavithra Murali, Vagelis Hristidis, Harsha V. Madhyastha, Vyas Sekar. Enabling the Transition to the Mobile Web with WebSieve. ACM HotMobile 2013 (acceptance rate 31%)
  39. Shiwen Cheng, Arash Termehchy, Vagelis Hristidis. Predicting the Effectiveness of Keyword Queries on Databases. ACM Conference on Information and Knowledge Management (CIKM) 2012 (full paper, acceptance rate 13.4%)
  40. Abhijith Kashyap, Vagelis Hristidis. Comprehension-Based Result Snippets. ACM Conference on Information and Knowledge Management (CIKM) 2012 (full paper, acceptance rate 13.4%)
  41. Abhijith Kashyap, Reza Amini, Vagelis Hristidis. SonetRank: Leveraging Social Networks to Personalize Search. ACM Conference on Information and Knowledge Management (CIKM) 2012 (short paper, acceptance rate 27.7%)
  42. Abhijith Kashyap, Vagelis Hristidis. LogRank: Summarizing Social Activity Logs. 15th SIGMOD International Workshop on the Web and Databases (WebDB) 2012
  43. Eduardo J. Ruiz, Vagelis Hristidis, Carlos Castillo, Aristides Gionis, Alejandro Jaimes. Correlating Financial Time Series with Micro-Blogging Activity. ACM International Conference on Web Search and Data Mining (WSDM) 2012, full paper with presentation (acceptance rate 8%, acceptance rate regardless presentation was 20.7%, wide media publicity from NY Times, Forbes, Yahoo!, Washington Post)
  44. Mahashweta Das, Gautam Das, Vagelis Hristidis. Leveraging Collaborative Tagging for Web Item Design. ACM SIGKDD (International Conference on Knowledge Discovery and Data Mining) 2011 (full paper, acceptance rate 7.8%)
  45. Vagelis Hristidis, Louiqa Raschid, Yao Wu. Scalable Link-based Personalization for Ranking in Entity-Relationship Graphs. 14th SIGMOD International Workshop on the Web and Databases (WebDB) 2011 (acceptance rate 27.9%)
  46. Abhijith Kashyap, Vagelis Hristidis, Michalis Petropoulos. FACeTOR: Cost-Driven Exploration of Faceted Query Results. ACM Conference on Information and Knowledge Management (CIKM) 2010 (full paper, acceptance rate 13.4%) [Best Interdisciplinary Paper Award]
  47. Vagelis Hristidis, Eduardo Ruiz, Alejandro Hernández, Fernando Farfán, Ramakrishna Varadarajan. PatentsSearcher: A Novel Portal to Search and Explore Patents. 3rd International Workshop on Patent Information Retrieval, at ACM CIKM 2010
  48. Louiqa Raschid, Vagelis Hristidis, John Edmond, Hassan Sayyadi. Challenges in Personalized Authority Flow Based Ranking of Social Media. ACM Conference on Information and Knowledge Management (CIKM) 2010 (short paper, acceptance rate 17.9%)
  49. Benjamin Arai, Gautam Das, Dimitrios Gunopulos, Vagelis Hristidis, Nick Koudas. An Access Cost-Aware Approach for Object Retrieval over Multiple Sources. Proceedings of the VLDB Endowment (PVLDB) and VLDB Conference 2010.
  50. Li Zheng, Chao Shen, Liang Tang, Tao Li, Steve Luis, Shu-Ching Chen, Vagelis Hristidis. Using Data Mining Techniques to Address Critical Information Exchange Needs in Disaster Affected Public-Private Networks. ACM SIGKDD Conference (Industrial/Government Track) 2010 (full presentation, acceptance rate 11%)
  51. Vagelis Hristidis, Yuheng Hu, Panagiotis G. Ipeirotis. Ranked Queries over Sources with Boolean Query Interfaces without Ranking Support. IEEE International Conference on Data Engineering (ICDE) 2010, short paper (acceptance rate 20%)
  52. Vagelis Hristidis, Eduardo Ruiz. CADS: A Collaborative Adaptive Data Sharing Platform. VLDB Workshop on Personalized Access, Profile Management, and Context Awareness in Databases (PersDB) 2009.
  53. Ariel Cary, Zhengguo Sun, Vagelis Hristidis, Naphtali Rishe. Experiences on Processing Spatial Data with MapReduce. 21st International Conference on Scientific and Statistical Database Management (SSDBM), 2009
  54. Ramakrishna Varadarajan, Vagelis Hristidis, Louiqa Raschid, Maria-Esther Vidal, Luis lbanez and Hector Rodriguez-Drumond: Flexible and Efficient Querying and Ranking on Hyperlinked Data Sources, International Conference on Extending Database Technology (EDBT) 2009 (full paper, acceptance rate 33%)
  55. Medha Bhadkamkar, Jorge Guerra, Luis Useche, Sam Burnett, Jason Liptak, Raju Rangaswami, and Vagelis Hristidis. BORG: Block-reORGanization for Self-Optimizing Storage Systems. USENIX File and Storage Technologies (FAST) 2009 (acceptance rate 22%)
  56. Fernando Farfán, Vagelis Hristidis, Anand Ranganathan, and Michael Weiner. XOntoRank: Ontology-Aware Search of Electronic Medical Records. IEEE International Conference on Data Engineering (ICDE) 2009 (long paper, acceptance rate 17%)
  57. Abhijith Kashyap, Vagelis Hristidis, Michalis Petropoulos, and Sotiria Tavoulari. BioNav: Effective Navigation on Query Results of Biomedical Databases. IEEE International Conference on Data Engineering, (ICDE) 2009 (short paper, acceptance rate 27%)
  58. K. Saleem, S. Luis, Y. Deng, S-C. Chen, V. Hristidis, T. Li. Towards a Business Continuity Information Network for Rapid Disaster Recovery. 9th Annual International Conference on Digital Government Research 2008
  59. Muhammed Miah, Gautam Das, Vagelis Hristidis, Heikki Mannila. Standing Out in a Crowd: Selecting Attributes for Maximum Visibility. IEEE International Conference on Data Engineering (ICDE) 2008 (full paper, short presentation, acceptance rate 19%)
  60. Ian De Felipe, Vagelis Hristidis, Naphtali Rishe. Keyword Search on Spatial Databases. IEEE International Conference on Data Engineering (ICDE) 2008 (full paper, long presentation, acceptance rate 12%)
  61. Ramakrishna Varadarajan, Vagelis Hristidis, Louiqa Raschid. Explaining and Reformulating Authority Flow Queries. IEEE International Conference on Data Engineering (ICDE) 2008 (full paper, short presentation, acceptance rate 19%)
  62. Vagelis Hristidis, Fernando Farfán, Redmond P. Burke, Anthony F. Rossi, Jeffrey A. White. Information Discovery on Electronic Medical Records. National Science Foundation Symposium on Next Generation of Data Mining and Cyber-Enabled Discovery for Innovation (NGDM) 2007 (acceptance rate 28%)
  63. Fernando Farfán, Vagelis Hristidis, Raju Rangaswami. Beyond Lazy XML Parsing. 18th International Conference on Database and Expert Systems Applications (DEXA) 2007 (acceptance rate 32%)
  64. Vagelis Hristidis, Peter J. Clarke, Nagarajan Prabakar, Yi Deng, Jeffrey A. White, Redmond P. Burke. A Flexible Approach for Electronic Medical Records Exchange. International Workshop on Health Information and Knowledge Management (HIKM), in conjunction with ACM CIKM, 2006
  65. Ramakrishna Varadarajan, Vagelis Hristidis: A System for Query-Specific Document Summarization. ACM Conference on Information and Knowledge Management (CIKM)  2006 (acceptance rate 15%)
  66. Yi Deng, S. Masoud Sadjadi, Peter Clarke, Chi Zhang, Vagelis Hristidis, Raju Rangaswami, Nagarajan Prabakar. A Communication Virtual Machine. International Computer Software and Applications Conference (COMPSAC) 2006 (acceptance rate 31%)
  67. Gautam Das, Vagelis Hristidis, Nishant Kapoor, S. Sudarshan. Ordering the Attributes of Query Results. ACM SIGMOD International Conference on Management of Data, 2006 (acceptance rate 13%)
  68. Peter J. Clarke, Vagelis Hristidis, Yingbo Wang, Nagarajan Prabakar and Yi Deng. A Declarative Approach for Specifying User-Centric Communication. Symposium on Collaborative Technologies and Systems (CTS), 2006
  69. Ken Pu, Vagelis Hristidis, Nick Koudas. A Syntactic Rule Based Approach to Web Service Composition. IEEE International Conference on Data Engineering (ICDE) 2006 (acceptance rate 19%)
  70. Andrey Balmin, Vagelis Hristidis, Yannis Papakonstantinou: ObjectRank: Authority-Based Keyword Search in Databases. International Conference on Very Large Databases (VLDB) 2004 (acceptance rate 16%)
  71. Surajit Chaudhuri, Gautam Das, Vagelis Hristidis, Gerhard Weikum: Probabilistic Ranking of Database Query Results. International Conference on Very Large Databases (VLDB) 2004 (acceptance rate 16%)
  72. Vagelis Hristidis, Luis Gravano, Yannis Papakonstantinou: Efficient IR-Style Keyword Search over Relational Databases. International Conference on Very Large Databases (VLDB) 2003 (acceptance rate 14%)
  73. Vagelis Hristidis, Yannis Papakonstantinou, Andrey Balmin: Keyword Proximity Search on XML Graphs (extended version). IEEE International Conference on Data Engineering (ICDE) 2003 (acceptance rate 13%)
  74. Vagelis Hristidis, Yannis Papakonstantinou: DISCOVER: Keyword Search in Relational Databases. International Conference on Very Large Databases (VLDB)2002 (acceptance rate 16%)
  75. Vagelis Hristidis, Michalis Petropoulos: Semantic Caching of XML Databases. SIGMOD International Workshop on the Web and Databases (WebDB) 2002
  76. Vagelis Hristidis, Nick Koudas, Yannis Papakonstantinou: PREFER: A System for the Efficient Execution of Multi-parametric Ranked Queries. ACM SIGMOD International Conference on Management of Data, 2001 (acceptance rate 15%) 
Journals
  1. Lawson McLean, A., Wu, Y., Lawson McLean, A.C., Vagelis Hristidis. Large language models as decision aids in neuro-oncology: a review of shared decision-making applications. J Cancer Res Clin Oncol 150, 139 (2024). https://doi.org/10.1007/s00432-024-05673-x
  2. Deiner M, Deiner NA, Hristidis V, McLeod SD, Doan T, Lietman TM, Porco TC. Use of large language models to assess likelihood of epidemics from content of Tweets: Infodemiology Study. Journal of Medical Internet Research (JMIR) 2024
  3. Vagelis Hristidis, Nicole Ruggiano, Ellen L Brown, Sai Rithesh Reddy Ganta, Selena Stewart. ChatGPT vs. Google for Queries Related to Dementia and Other Cognitive Decline: Results Comparison. Journal of Medical Internet Research (JMIR), 2023
  4. Qizhong Mao, Mohiuddin Abdul Qader, Vagelis Hristidis. Comparison of LSM Indexing Techniques for Storing Spatial Data. Springer Journal of Big Data, 2023
  5. Pritom Ahmed, Ahmed Eldawy, Vagelis Hristidis, Vassilis J Tsotras. Reverse Spatial Top-k Keyword Queries. VLDB Journal 2022
  6. Ryan Rivas, Sudipta Paul, Vagelis Hristidis, Evangelos E. Papalexakis, Amit K. Roy-Chowdhury. Task-Agnostic Representation Learning of Multimodal Twitter Data for Downstream Applications. Journal of Big Data volume 9, Article number: 18 (2022)  (impact factor 10.835)
  7. Nhat Le, Muhammad Abu Bakar Siddique, Fuad Jamour, Samet Oymak, Vagelis Hristidis. Generating Predictable and Adaptive Dialog Policies in Single- and Multi-domain Goal-oriented Dialog Systems. International Journal of Semantic Computing (IJSC). Vol. 15, No. 04, pp. 419-439 (2021)
  8. Nhat Le, Abdulaziz Almaslukh, Moloud Shahbazi, Vagelis Hristidis. Query by Documents on Top of a Search Interface. Elsevier Information Systems Journal, Volume 101, November 2021, 2021 (Impact Factor: 2.466)
  9. Ruggiano N, Brown EL, Roberts L, Framil Suarez CV, Luo Y, Hao Z, Hristidis V. Chatbots to Support People with Dementia and Their Caregivers: A Systematic Review of Functions and Quality. Journal of Medical Internet Research (JMIR), Vol 23, No 6 (2021): June 2021
  10. Ryan Rivas, Vagelis Hristidis. Effective Social Post Classifiers on Top of Search Interfaces. Data Mining and Knowledge Discovery Journal, 35(3), pp 1809-1829, 2021
  11. Qizhong Mao, Steven Jacobs, Waleed Amjad, Vagelis Hristidis, Vassilis J. Tsotras, Neal E. Young. Comparison and Evaluation of State-of-the-Art LSM Merge Policies. The International Journal on Very Large Data Bases (VLDB Journal, Five year impact factor 3.508), 30, pages 361-378 (2021)
  12. Robert C. Wright, Doerte U. Junghaenel, Ryan Rivas, Vagelis Hristidis, Megan L. Robbins. A New Approach to Capturing Pain Disclosure in Daily Life In-Person and Online. Journal of Health Psychology, Vol 26, Issue 13, 2021 (impact factor 3.789)
  13. Nhat Le, Matthew Wiley, Antonio Loza, Vagelis Hristidis, Robert El-Kareh. Prediction of Medical Concepts in Electronic Health Records: Similar Patient Analysis. JMIR Medical Informatics (JMI), 2020;8(7), doi: 10.2196/16008 (impact factor 3.23)
  14. Ryan Rivas, Moloud Shahbazi, Renee Garett, Vagelis Hristidis, Sean Young. Mental Health-Related Behaviors and Discussions Among Young Adults: Analysis and Classification. Journal of Medical Internet Research (JMIR), 2020;22(5), doi: 10.2196/17224 (impact factor 7.08)
  15. Ryan Rivas, Shouq Sadah, Yuhang Guo, and Vagelis Hristidis. Classification of Health-Related Social Media Posts: Analysis and Evaluation. JMIR Public Health and Surveillance, 2020;6(2), doi: 10.2196/14952 (impact factor 14.56)
  16. My Hua, Shouq Sadah, Vagelis Hristidis,Prue Talbot. Health Effects Associated with Electronic Cigarette Use: Automated Mining of Online Forums. Journal of Medical Internet Research, 2020;22(1) (impact factor 4.9)
  17. Nhat Le, Ryan Rivas, James Flegal, Vagelis Hristidis. Decrease Product Rating Uncertainty Through Focused Reviews Solicitation. International Journal of Semantic Computing (IJSC) 13(4), 25 pages, December 2019
  18. Ryan Rivas, Dinesh Patil, Vagelis Hristidis, Joseph R. Barr, Narayanan Srinivasan. The Impact of Colleges and Hospitals to Local Real Estate Markets. Springer Journal of Big Data (CiteScore 2017 = 8.51, https://www.scopus.com/sourceid/21100791292), 24 pages, January 2019
  19. Nicole Ruggiano, Ellen Brown, S. Shaw, D. Geldmacher, Peter Clarke, Vagelis Hristidis, J. Bertram. The potential of information technology to navigate caregiving systems: Perspectives from dementia caregivers. Journal of Gerontological Social Work, Volume 62, Issue 4, 2019 (runner-up for 2020 Rose Dobrof Award)
  20. Ryan Rivas, Niloofar Montazeri, Nhat Le, Vagelis Hristidis. Automatic Classification of Online Doctor Reviews, Journal of Medical Internet Research, 2018
  21. Mohiuddin Abdul Qader, Vagelis Hristidis. High-throughput Publish/Subscribe on top of LSM-based Storage. Distributed and Parallel Databases (DAPD) Journal, March 2019, Volume 37, Issue 1, pp 101-132
  22. Louiqa Raschid, Hassan Sayyadi, Vagelis Hristidis. Learning to Rank in Entity Relationship Graphs. INFORMS Journal on Computing, June 2019
  23. Ellen Brown, Nicole Ruggiano, Juanjuan Li, Peter Clarke, Emma Sophia Kay, and Vagelis Hristidis. Smartphone-based Health Technologies for Dementia Care: Opportunities, Challenges, and Current Practices. Journal of Applied Gerontology, 2017
  24. Prajna Shetty, Ryan Rivas and Vagelis Hristidis. Correlating Health Insurance Plans' Ratings to Their Providers' Attributes. Journal of Medical Internet Research 2016 (impact factor 5.175)
  25. Shouq A Sadah, Moloud Shahbazi, Matthew T Wiley, Vagelis Hristidis. Demographic-Based Content Analysis of Online Health-Related Social Media. Journal of Medical Internet Research, 2016 (impact factor 5.175)
  26. Matthew T. Wiley, Ryan L. Rivas and Vagelis Hristidis. Provider attributes correlation analysis to their referral frequency and awards. BMC Health Services Research, volume 16, number 1, pages 1-13, 2016
  27. Ellen Leslie Brown, Nicole Ruggiano, Timothy F. Page, Lisa Roberts, Vagelis Hristidis, Karen L. Whiteman, Joana Castro. CareHeroes Web and Android Apps for Dementia Caregivers: A Feasibility Study. Research in Gerontological Nursing, July/August 2016 - Volume 9, Issue 4: 193-203, 2016
  28. Shouq A Sadah, Moloud Shahbazi, Matthew T Wiley, Vagelis Hristidis. A Study of the Demographics of Web-Based Health-Related Social Media Users. Journal of Medical Internet Research, Vol 17, No 8, 2015 (impact factor 5.175)
  29. Matthew Wiley, Canghong Jin, Vagelis Hristidis, Kevin M Esterling. Pharmaceutical Drugs Chatter on Online Social Networks. Elsevier Journal of Biomedical Informatics, Volume 49, Pages 245-254, June 2014 (featured in news media like Press-News, Medical Express, Redorbit, AccessRX)
  30. Eduardo J. Ruiz, Vagelis Hristidis, Panagiotis G. Ipeirotis. Facilitating Document Annotation using Content and Querying Value. IEEE Transactions on Knowledge and Data Engineering (TKDE)  Volume 26, Issue 2, pages 336-349, 2014
  31. Vagelis Hristidis, Yao Wu, Louiqa Raschid. Efficient Ranking on Entity Graphs with Personalized Relationships. IEEE Transactions on Knowledge and Data Engineering (TKDE), vol. 26 no. 4, pages 850-863, April 2014
  32. Shiwen Cheng, Arash Termehchy, Vagelis Hristidis. Efficient Prediction of Difficult Keyword Queries over Databases. IEEE Transactions on Knowledge and Data Engineering (TKDE), vol. 26 no. 6, June 2014
  33. Ramakrishna Varadarajan, Fernando Farfan, Vagelis Hristidis. Comparing Top-k XML Lists. Elsevier Information Systems, 2013
  34. Nicole Ruggiano, Ellen Brown, Vagelis Hristidis, Timothy F. Page. Adding home health care to the discussion on health information technology policy. Home Health Care Services Quarterly, 2013
  35. Vagelis Hristidis. Challenges and Communities of Medical Informatics Research. ACM SIGMOD Record, Dec. 2012
  36. Timothy F. Page, Ellen L. Brown, Nicole Ruggiano, Lisa Roberts, Vagelis Hristidis. Improving Care Delivery Using Health Information Technology in the Home Care Setting: Development of the Home Continuation Care Dashboard. Annals of Long-Term Care: Clinical Care and Aging. 2012;20(12):26-30
  37. N. Ruggiano, N. Shtompel, V. Hristidis, L. Roberts, J. Grochowski, E. L. Brown. Need and Potential Use of Information Technology for Case Manager-Physician Communication in Home Care. Home Healthcare Management and Practice. 2012
  38. Abhijith Kashyap, Vagelis Hristidis, Michalis Petropoulos, Sotiria Tavoulari: Effective Navigation of Query Results Based on Concept Hierarchies. IEEE Trans. Knowl. Data Eng. (TKDE) 23(4): 540-553 (2011)
  39. Vagelis Hristidis, Yuheng Hu, Panagiotis G. Ipeirotis: Relevance-Based Retrieval on Hidden-Web Text Databases without Ranking Support. IEEE Trans. Knowl. Data Eng. (TKDE) 23(10): 1555-1568 (2011)
  40. Vagelis Hristidis, Ramakrishna Varadarajan, Paul Biondich, Michael Weiner: Information Discovery on Electronic Medical Records Using Authority-Flow Techniques, In BMC Medical Informatics and Decision Making 2010, 10:64, pages 1-11
  41. Vagelis Hristidis, Shu-Ching Chen, Tao Li, Steven Luis, Yi Deng: Survey of data management and analysis in disaster situations. Journal of Systems and Software 83(10): 1701-1714 (2010)
  42. Vagelis Hristidis, Yannis Papakonstantinou, Ramakrishna Varadarajan: Using Proximity Search to Estimate Authority Flow. IEEE Trans. Knowl. Data Eng. (TKDE) 22(12):1803-1808 (2010)
  43. Vagelis Hristidis, Oscar Valdivia, Michail Vlachos, Philip S. Yu: Information discovery across multiple streams. Elsevier Information Sciences 179(19):3268-3285 (2009)
  44. Muhammed Miah, Gautam Das, Vagelis Hristidis, Heikki Mannila: Determining Attributes to Maximize Visibility of Objects. IEEE Trans. Knowl. Data Eng. (TKDE) 21(7):959-973 (2009)
  45. Medha Bhadkamkar, Fernando Farfán, Vagelis Hristidis, and Raju Rangaswami. Storing Semi-structured data on disk drives. ACM Transactions on Storage, Vol. 5, Issue # 2, May, 2009 .
  46. Fernando Farfán, Vagelis Hristidis, Raju Rangaswami. 2LP: A Double-Lazy XML Parser. Elsevier Information Systems 34 (2009), pp. 145-163
  47. Man Lung Yiu, Nikos Mamoulis, Vagelis Hristidis: Extracting k most important groups from data efficiently. Data Knowl. Eng. 66(2): 289-310 (2008).
  48. Yi Deng, Seyed Masoud Sadjadi, Peter J. Clarke, Vagelis Hristidis, Raju Rangaswami, Yingbo Wang: CVM - A communication virtual machine. Journal of Systems and Software 81(10): 1640-1662 (2008)
  49. Ramakrishna Varadarajan, Vagelis Hristidis, Tao Li: Beyond Single-Page Web Search Results. IEEE Trans. Knowl. Data Eng. (TKDE) 20(3): 411-424 (2008)
  50. Vagelis Hristidis, Heasoo Hwang, Yannis Papakonstantinou. Authority-Based Keyword Search in Databases. ACM Trans. Database Syst (TODS) 33(1), pages 1-40, 2008
  51. Yufei Tao, Vagelis Hristidis, Dimitris Papadias, Yannis Papakonstantinou. Branch-and-Bound Processing of Ranked Queries. Elsevier Information Systems Volume 32, Issue 3, May 2007, Pages 424-445
  52. Surajit Chaudhuri, Gautam Das, Vagelis Hristidis, Gerhard Weikum: Probabilistic Information Retrieval Approach for Ranking of Database Query Results. ACM Trans. Database Syst (TODS) 31, 3 (Sep. 2006), 1134-1168
  53. Vagelis Hristidis, Nick Koudas, Yannis Papakonstantinou, Divesh Srivastava. Keyword Proximity Search in XML Trees. IEEE Trans. Knowl. Data Eng. (TKDE) , April 2006 (Vol. 18, No. 4) pp. 525-539
  54. Vagelis Hristidis, Yannis Papakonstantinou: Algorithms and Applications for answering Ranked Queries using Ranked Views. VLDB Journal, Volume 13 , Issue 1, pages:49-70, January 2004
Book Chapters
  1. Vagelis Hristidis. Ranking Views. Encyclopedia of Databases, Springer, 2017
  2. Vagelis Hristidis, Fernando Farfán, Redmond P. Burke, Anthony F. Rossi, Jeffrey A. White. Challenges for Information Discovery on Electronic Medical Records. Book details: Next Generation of Data Mining. CRC - Taylor & Francis. Editors: Hillol Kargupta, Jiawei Han, Philip Yu, Rajeev Motwani, Vipin Kumar. 2008
Demos/Posters
  1. Ruggiano, N., Brown, E. L., Clarke, P., Roberts, L., Framil, C. V., Chevez, H., Hurley, S., Kopcsik, C., Allala, S. C., Hristidis, V., Agronin, M., & Geldmacher, D. S. (July 2023). Applying Implementation Frameworks to Health IT Development in Dementia Care: Lessons from the CareHeroes Project. Poster presented at the Alzheimer’s Association International Conference, Amsterdam, The Netherlands.
  2. Steven Jacobs, Md Yusuf Sarwar Uddin, Michael Carey, Vagelis Hristidis, Vassilis J. Tsotras, N. Venkatasubramanian, Yao Wu, Syed Safir, Purvi Kaul, Xikui Wang, Mohiuddin Abdul Qader, Yawei Li. A BAD Demonstration: Towards Big Active Data. Demo at VLDB 2017
  3. Shouq Sadah, Moloud Shahbazi, Vagelis Hristidis. Querying Documents Annotated by Interconnected Entities. AAAI Conference on Weblogs and Social Media (ICWSM) 2017 (poster, 4 pages)
  4. Nhat Le, Vagelis Hristidis and Neal Young. Ontology- and Sentiment-aware Review Summarization. IEEE International Conference on Data Engineering (ICDE) 2017, poster paper (4 pages)
  5. Moloud Shahbazi, Matthew Wiley and Vagelis Hristidis. IRanker: Query-Specific Ranking of Reviewed Items. IEEE International Conference on Data Engineering (ICDE) 2017, poster paper (4 pages)
  6. Nicole Ruggiano, Ellen L Brown, Lisa Roberts, Vagelis Hristidis, and Peter Clarke. Expanding Health Information Technology to Support Hispanic Caregivers And Improve Dementia Care. Gerontological Society of America (GSA), The Gerontologist, Volume 56, Issue Suppl_3, 1 November 2016
  7. Nicole Ruggiano, Ellen L Brown, Lisa Roberts, Vagelis Hristidis, and Peter Clarke. Health Information Technology for Rural Caregivers: Intersecting Science, Policy and Practice . 21st IAGG World Congress of Gerontology and Geriatrics, San Francisco, 2017
  8. Shiwen Cheng, James Fang, Vagelis Hristidis, Harsha V. Madhyastha, Niluthpol Chowdhury Mithun, Dorian Perkins, Amit K. Roy-Chowdhury, Moloud Shahbazi, and Vassilis J. Tsotras. OSNI: Searching for Needles in a Haystack of Social Network Data. Demo at International Conference on Extending Database Technology (EDBT) 2016
  9. Azade Nazi, Saravanan Thirumuruganathan, Vagelis Hristidis, Nan Zhang and Gautam Das. Answering Complex Queries in an Online Community Network. Poster Paper, AAAI Conference on Weblogs and Social Media (ICWSM) 2015 (acceptance rate 25%)
  10. Hassan Sayyadi, John Edmonds, Vagelis Hristidis, Louiqa Raschid. Challenges in Personalized Authority Flow Based Ranking of Social Media. Poster Paper, 4th Int'l AAAI Conference on Weblogs and Social Media (ICWSM), 2010.
  11. Abhijith Kashyap, Vagelis Hristidis, Michalis Petropoulos and Sotiria Tavoulari. Exploring Biomedical Databases with BioNav. Demo Paper, ACM SIGMOD Conference 2009 (acceptance rate 37%)
  12. Fernando Farfán, Vagelis Hristidis, Anand Ranganathan, Redmond P. Burke. Ontology-Aware Search on XML-based Electronic Medical Records. Poster Paper, IEEE International Conference on Data Engineering (ICDE) 2008 (acceptance rate 31%)
  13. Vagelis Hristidis, Oscar Valdivia, Michalis Vlachos, Philip Yu. A System for Keyword Search on Textual Streams. Short Paper, SIAM Conference on Data Mining (SDM) 2007 (acceptance rate 25%)
  14. Nishant Kapoor, Gautam Das, Vagelis Hristidis, S. Sudarshan, Gerhard Weikum. STAR: A System for Tuple and Attribute Ranking of Query Answers. Demo paper, International Conference on Data Engineering (ICDE) 2007
  15. Vagelis Hristidis, Oscar Valdivia, Michalis Vlachos, Philip S. Yu: Continuous Keyword Search on Multiple Text Streams. Poster paper, ACM Conference on Information and Knowledge Management (CIKM) 2006 (acceptance rate 25%)
  16. Ramakrishna Varadarajan, Vagelis Hristidis, Tao Li: Searching the Web Using Composed Pages. Poster paper, ACM SIGIR 2006
  17. Heasoo Hwang, Vagelis Hristidis, Yannis Papakonstantinou. ObjectRank: A System for Authority-based Search on Databases. Demo paper, ACM SIGMOD 2006
  18. Medha Bhadkamkar, Fernando Farfán, Vagelis Hristidis, and Raju Rangaswami. Storing Trees on Disk Drives. Proceedings of the File and Storage Technologies WiP, 2005.
  19. Ramakrishna Varadarajan, Vagelis Hristidis: Structure-Based Query-Specific Document Summarization. Poster paper, ACM Conference on Information and Knowledge Management (CIKM) 2005
  20. Andrey Balmin, Vagelis Hristidis, Nick Koudas, Yannis Papakonstantinou, Divesh Srivastava, Tianqiu Wang: A System for Keyword Search on XML Databases. Demo paper, International Conference on Very Large Databases (VLDB) 2003

Tutorials

  1. Chatbot Technologies and Challenges, tutorial at IEEE International Conference on Artificial Intelligence for Industries (ai4i), Laguna Hills, CA, September 2018

Technical Reports

  1. Vagelis Hristidis, Yannis Papakonstantinou: Merging results from Multi-parametric Ranked Queries. UCSD Technical Report, 2001

PATENTS/APPLICATIONS

  1. Searching digital information and databases, with Andrey Balmin and Yannis Papakonstantinou, US Patent No 8,862,594, filed Feb 19, 2010, issued Oct 14, 2014
  2. Ranking database query results using probabilistic models from information retrieval, with Surajit Chaudhuri, Gautam Das and Gerhard Weikum, US Patent No 7,383,262, filed June 29, 2004, issued June 3, 2008
  3. Searching digital information and databases, with Andrey Balmin and Yannis Papakonstantinou, US Patent No 7,698,267, filed August 29, 2005, issued April 13, 2010
  4. Communication Virtual Machine (CVM), with Yi Deng, Steven Luis, Masoud Sadjadi, Peter J Clarke, Raju Rangaswami. US Patent No 8,578,325, filed 10/2007, issued 11/2013
  5. Adding Context to XML Keyword Searches (U.S. Patent Application No. 10/826,638), with Nick Koudas and Divesh Srivastava, AT&T Research, filed 2004

PROFESSIONAL ACTIVITIES

KEYNOTES AND SELECTED PRESENTATIONS

  1. Invited talk at the IEEE Workshop of AI in Cybersecurity, Privacy and Software Engineering (ai4cp) 2022 (remote)
  2. Invited talk at Future Leaders in Advancing Society and Health through Technology (FLASH Tech) Conference 2022, Alabama (remote)
  3. Panelist at 22nd IEEE International Symposium on Multimedia, December 2020
  4. Panelist at IEEE Artificial Intelligence for Industries (ai4i), September 2020
  5. Analysis of Online Health-Related User-Generated Content, Variants given at:
    1. Invited talk at Opioid Hackathon, Irvine, CA, October 2018
    2. Keynote talk at DMAH Workshop at VLDB, Munich, 2017
    3. Keynote talk at the KDD bigdas Workshop, Halifax, 2017
  6. Chatbot Technologies and Challenges, Tutorial at Artificial Intelligence for Industries (ai4i), Laguna Hills, CA,  September 2018
  7. Correlating Financial and Other Time Series with Micro-Blogging Activity, IBM Zurich, 2013
  8. Collaborative Tagging for Web Item Design and Health Data Management Research, Microsoft Research, Redmond, 2012
  9. PatentsSearcher: A Novel Portal to Search and Explore Patents. 3rd International Workshop on Patent Information Retrieval, at ACM CIKM 2010, Toronto
  10. An Access Cost-Aware Approach for Object Retrieval over Multiple Sources, VLDB 2010, Singapore
  11. Information Discovery in Vertical Domains. Invited Talk, Variants given at:
    1. University of Athens, Greece, July 2010
    2. Yahoo! Research Barcelona, July 2010
    3. University of Waterloo, Canada, June 2010
    4. Free University of Bolzano, Bolzano, Italy, August 2009
    5. University of Roma Tre, Rome, Italy, July 2009
    6. University of Tsinghua, Beijing, China, April 2009
    7. University of Maryland, College Park, October 2008
  12. CADS: A Collaborative Adaptive Data Sharing Platform. VLDB Workshop on Personalized Access, Profile Management, and Context Awareness in Databases (PersDB 2009), Lyon, France, August 2009
  13. Experiences on Processing Spatial Data with MapReduce. 21st International Conference on Scientific and Statistical Database Management (SSDBM), New Orleans, 2009
  14. Towards a Business Continuity Information Network for Rapid Disaster Recovery. 9th Annual International Conference on Digital Government Research 2008, Montreal
  15. Search Electronic Medical Records. NSF Research Center, Bloomington, Indiana, January 2008
  16. Keyword Search on Spatial Databases. IEEE ICDE 2008, Cancun
  17. Information Discovery on Electronic Medical Records. National Science Foundation Symposium on Next Generation of Data Mining and Cyber-Enabled Discovery for Innovation (NGDM) 2007, Baltimore, 2007
  18. Information Discovery on Electronic Medical Records. Bioinformatics Journal, University of Miami, Miami, November 2007
  19. A Flexible Approach for Electronic Medical Records Exchange. International Workshop on Health Information and Knowledge Management (HIKM), Arlington, VA, November 2006
  20. Storing Trees on Disk Drives. Invited Talk, University of California, San Diego (UCSD), 1/13/2006
  21. Keyword Search in Databases. Invited Talk
    1. IBM T.J. Watson Research Center, May 2005
    2. University of Texas at Arlington, 11/12/04
    3. University of Toronto, 10/21/2004
  22. Probabilistic Ranking of Database Query Results. At VLDB 2004, Toronto
  23. Efficient IR-style Keyword Search over Relational Databases. At VLDB 2003, Berlin
  24. Keyword Search In Databases. At Microsoft Research, 7/2003
  25. XKeyword's presentation, at IEEE ICDE 2003, Bangalore, India
  26. DISCOVER's presentation, at VLDB 2002, Hong Kong.
  27. XCacher's presentation, at WebDB 2002, Madison, WI.
  28. PREFER's presentation, at ACM SIGMOD 2001, Santa Barbara, CA.

ENTREPRENEURSHIP

Founded UCR spin-off company SmartBot360 in 2018, which has been supported by an STTR (NSF IIP-1448848) and an SBIR (NSF IIP-1819362) grant. SmartBot360 offers a secure AI chatbot platform. It has employed over time several UCR students and graduates.

LANGUAGES

English (Cambridge Proficiency), Greek (native), German (Goethe Zertifikat)

REFERENCES

available upon request