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

Associate Professor, 2011-present
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
 
Graduate Research Assistant, 1999-2004
Database Laboratory of Computer Science & Engineering Dept
University of California, San Diego
 
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.
 
Teaching Assistant, 1999-2002
Computer Science & Engineering Dept
University of California, San Diego
 
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. 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
  2. NSF IIS-1447826 - $750,000, 9/2014-8-2018
    Role: sole co-PI (PI: V. Tsotras)
    Title: BIGDATA: F: DKM: Collaborative Research: Making Big Data Active: From Petabytes to Megafolks in Milliseconds
  3. 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
  4. Samsung Research Award. $100K/year, start: 2/2014
    Role: PI (co-PI: Laxmi Bhuyan)
    Title: IO Optimizations for Bigdata Stores
  5. 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)
  6. 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
  7. 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
  8. 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
  9. Google Research Award, $70K, awarded in 8/2010
    Role: PI (co-PI Panos Ipeirotis)
    Title: Collaborative Adaptive Data Sharing
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. Kauffman Foundation of Entrepreneurship- $10K, active from 2/1/2008 to 2/1/2009
    Role: sole PI
    Title: Effective Search on Patent Databases
  20. 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. 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%)
  2. 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%)
  3. 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)
  4. 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%)
  5. 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%)
  6. Anastasios Arvanitis, Matthew Wiley, Vagelis Hristidis Efficient Concept-based Document Ranking. International Conference on Extending Database Technology (EDBT) 2014 (full paper, acceptance rate: 20%)
  7. 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
  8. Shiwen Cheng, Vagelis Hristidis, Michael Weiner. Leveraging User Query Sessions to Improve Searching of Medical Literature. American Medical Informatics Association (AMIA) Annual Symposium 2013
  9. 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%)
  10. 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%)
  11. 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%)
  12. 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%)
  13. 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%)
  14. Abhijith Kashyap, Vagelis Hristidis. Comprehension-Based Result Snippets. ACM Conference on Information and Knowledge Management (CIKM) 2012 (full paper, acceptance rate 13.4%)
  15. 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%)
  16. Abhijith Kashyap, Vagelis Hristidis. LogRank: Summarizing Social Activity Logs. 15th SIGMOD International Workshop on the Web and Databases (WebDB) 2012
  17. 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)
  18. 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%)
  19. 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%)
  20. 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]
  21. 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
  22. 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%)
  23. 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.
  24. 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%)
  25. 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%)
  26. 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.
  27. 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
  28. 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%)
  29. 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%)
  30. 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%)
  31. 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%)
  32. 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
  33. 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%)
  34. 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%)
  35. 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%)
  36. 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%)
  37. Fernando Farfán, Vagelis Hristidis, Raju Rangaswami. Beyond Lazy XML Parsing. 18th International Conference on Database and Expert Systems Applications (DEXA) 2007 (acceptance rate 32%)
  38. 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
  39. Ramakrishna Varadarajan, Vagelis Hristidis: A System for Query-Specific Document Summarization. ACM Conference on Information and Knowledge Management (CIKM)  2006 (acceptance rate 15%)
  40. 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%)
  41. 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%)
  42. 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
  43. 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%)
  44. Andrey Balmin, Vagelis Hristidis, Yannis Papakonstantinou: ObjectRank: Authority-Based Keyword Search in Databases. International Conference on Very Large Databases (VLDB) 2004 (acceptance rate 16%)
  45. 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%)
  46. 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%)
  47. 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%)
  48. Vagelis Hristidis, Yannis Papakonstantinou: DISCOVER: Keyword Search in Relational Databases. International Conference on Very Large Databases (VLDB)2002 (acceptance rate 16%)
  49. Vagelis Hristidis, Michalis Petropoulos: Semantic Caching of XML Databases. SIGMOD International Workshop on the Web and Databases (WebDB) 2002
  50. 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. Matthew Wiley, Canghong Jin, Vagelis Hristidis, Kevin M Esterling. Pharmaceutical Drugs Chatter on Online Social Networks. Elsevier Journal of Biomedical Informatics, Volume 49, Pages 245254, June 2014 (featured in news media like Press-News, Medical Express, Redorbit, AccessRX)
  2. 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
  3. 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
  4. 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
  5. Ramakrishna Varadarajan, Fernando Farfan, Vagelis Hristidis. Comparing Top-k XML Lists. Elsevier Information Systems, 2013
  6. 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
  7. Vagelis Hristidis. Challenges and Communities of Medical Informatics Research. ACM SIGMOD Record, Dec. 2012
  8. 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
  9. 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
  10. 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)
  11. 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)
  12. 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
  13. 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)
  14. Vagelis Hristidis, Yannis Papakonstantinou, Ramakrishna Varadarajan: Using Proximity Search to Estimate Authority Flow. IEEE Trans. Knowl. Data Eng. (TKDE) 22(12):1803-1808 (2010)
  15. Vagelis Hristidis, Oscar Valdivia, Michail Vlachos, Philip S. Yu: Information discovery across multiple streams. Elsevier Information Sciences 179(19):3268-3285 (2009)
  16. 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)
  17. 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 .
  18. Fernando Farfán, Vagelis Hristidis, Raju Rangaswami. 2LP: A Double-Lazy XML Parser. Elsevier Information Systems 34 (2009), pp. 145-163
  19. Man Lung Yiu, Nikos Mamoulis, Vagelis Hristidis: Extracting k most important groups from data efficiently. Data Knowl. Eng. 66(2): 289-310 (2008).
  20. 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)
  21. Ramakrishna Varadarajan, Vagelis Hristidis, Tao Li: Beyond Single-Page Web Search Results. IEEE Trans. Knowl. Data Eng. (TKDE) 20(3): 411-424 (2008)
  22. Vagelis Hristidis, Heasoo Hwang, Yannis Papakonstantinou. Authority-Based Keyword Search in Databases. ACM Trans. Database Syst (TODS) 33(1), pages 1-40, 2008
  23. 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
  24. 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
  25. 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
  26. 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, 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. 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.
  2. Abhijith Kashyap, Vagelis Hristidis, Michalis Petropoulos and Sotiria Tavoulari. Exploring Biomedical Databases with BioNav. Demo Paper, ACM SIGMOD Conference 2009 (acceptance rate 37%)
  3. 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%)
  4. 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%)
  5. 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
  6. 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%)
  7. Ramakrishna Varadarajan, Vagelis Hristidis, Tao Li: Searching the Web Using Composed Pages. Poster paper, ACM SIGIR 2006
  8. Heasoo Hwang, Vagelis Hristidis, Yannis Papakonstantinou. ObjectRank: A System for Authority-based Search on Databases. Demo paper, ACM SIGMOD 2006
  9. Medha Bhadkamkar, Fernando Farfán, Vagelis Hristidis, and Raju Rangaswami. Storing Trees on Disk Drives. Proceedings of the File and Storage Technologies WiP, 2005.
  10. Ramakrishna Varadarajan, Vagelis Hristidis: Structure-Based Query-Specific Document Summarization. Poster paper, ACM Conference on Information and Knowledge Management (CIKM) 2005
  11. 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
Technical Reports
  1. Vagelis Hristidis, Yannis Papakonstantinou: Merging results from Multi-parametric Ranked Queries. UCSD Technical Report, 2001

PATENTS/APPLICATIONS

  1. 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
  2. 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
  3. 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
  4. 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

PRESENTATIONS AND INVITED LECTURES

  1. PatentsSearcher: A Novel Portal to Search and Explore Patents. 3rd International Workshop on Patent Information Retrieval, at ACM CIKM 2010, Toronto
  2. An Access Cost-Aware Approach for Object Retrieval over Multiple Sources, VLDB 2010, Singapore
  3. Information Discovery in Vertical Domains. Invited Talk, Variants given at:
    a. University of Athens, Greece, July 2010
    b. Yahoo! Research Barcelona, July 2010
    c. University of Waterloo, Canada, June 2010
    d. Free University of Bolzano, Bolzano, Italy, August 2009
    e. University of Roma Tre, Rome, Italy, July 2009
    f. University of Tsinghua, Beijing, China, April 2009
    g. University of Maryland, College Park, October 2008
  4. 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
  5. Experiences on Processing Spatial Data with MapReduce. 21st International Conference on Scientific and Statistical Database Management (SSDBM), New Orleans, 2009
  6. Towards a Business Continuity Information Network for Rapid Disaster Recovery. 9th Annual International Conference on Digital Government Research 2008, Montreal
  7. Search Electronic Medical Records. NSF Research Center, Bloomington, Indiana, January 2008
  8. Keyword Search on Spatial Databases. IEEE ICDE 2008, Cancun
  9. 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
  10. Information Discovery on Electronic Medical Records. Bioinformatics Journal, University of Miami, Miami, November 2007
  11. A Flexible Approach for Electronic Medical Records Exchange. International Workshop on Health Information and Knowledge Management (HIKM), Arlington, VA, November 2006
  12. Storing Trees on Disk Drives. Invited Talk, University of California, San Diego (UCSD), 1/13/2006
  13. Keyword Search in Databases. Invited Talk
    a. IBM T.J. Watson Research Center, May 2005
    b. University of Texas at Arlington, 11/12/04
    c. University of Toronto, 10/21/2004
    d. FIU SCIS Colloquium, October 2004
  14. Probabilistic Ranking of Database Query Results. At VLDB 2004, Toronto
  15. Efficient IR-style Keyword Search over Relational Databases. At VLDB 2003, Berlin
  16. Keyword Search In Databases. At Microsoft Research, 7/2003
  17. XKeyword's presentation, at IEEE ICDE 2003, Bangalore, India
  18. Random Walk in Stuctured Databases, at UCSD Research Seminar, 2003
  19. Thesis Proposal, at UCSD, 2002
  20. DISCOVER's presentation, at VLDB 2002, Hong Kong.
  21. XCacher's presentation, at WebDB 2002, Madison, WI.
  22. PREFER's presentation, at ACM SIGMOD 2001, Santa Barbara, CA.

LANGUAGES

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

REFERENCES

available upon request