Research Interests

• Parallel and distributed file I/O and storage system design
• Data management for large-scale scientific applications
• Computational model design for large-scale applications on parallel and distributed environment
• Data mining algorithm design and their parallelization
• Software development for Parallel netCDF

Research

• The Center for Ultra-scale Computing and Information Security (CUCIS)

• Major Research Projects
  • September 1, 2010 - August 31, 2013
    Understanding Climate Change: A Data Driven Approach
    -- sponsored by NSF under the program of Expeditions in Computing
  • October 2010 - September 2013
    X-Analytics - Scalable and Power Efficient Data Analytics for Hybrid Exascale Systems
    -- sponsored by DOE Office of Science, Advanced Scientific Computing Research (ASCR)
  • October 2010 - September 2013
    Damsel - A Data Model Storage Library for Exascale
    -- sponsored by DOE Office of Science, Advanced Scientific Computing Research (ASCR)
  • May 1, 2010 --- April 30, 2013
    An Application Driven I/O Optimization Approach for PetaScale Systems and Scientific Discoveries
    -- sponsored by NSF under the program of HECURA
  • October 2008 -
    High-Performance DNA Sequence Mapping
  • August 1, 2007 --- July 31, 2011
    Parallel I/O Software Infrastructure for Petascale Systems
    -- sponsored by NSF under the program of SDCI HPC
  • January 2004 ---
    Design, Development and Evaluation of High Performance Data Mining Systems
    -- sponsored by Intel
  • July 2001 ---
    Scientific Data Management Center
    -- sponsored by DOE under the program of Scientific Discovery through Advanced Computing (SciDAC)
  • July 2002 --- 2006
    Scalable implementation for overlapping file access in MPI-IO
    -- sponsored by DOE Sandia National Laboratory
  • August 1999 --- August 2002
    High-Performance Data Management, Access, and Storage Techniques for Tera-scale Scientific Applications
  • Jan. 1997 --- May 1999
    Design, Implementation and Evaluation of Parallel Pipelined Space-Time Adaptive Processing on Parallel Computers

Selected Publications:

1. Arifa Nisar, Wei-keng Liao, and Alok Choudhary. Delegation-based I/O Mechanism for High Performance Computing Systems. In the IEEE Transactions on Parallel and Distributed Sytems, vol. 23, no. 2, pages 271-79, February 2012.
2. Wei-keng Liao, and Alok Choudhary. Dynamically Adapting File Domain Partitioning Methods for Collective I/O Based on Underlying Parallel File System Locking Protocols. In the Proceedings of International Conference for High Performance Computing, Networking, Storage and Analysis, Austin, Texas, November 2008. ---- (This paper proposes MPI-IO optimizations for Lustre and GPFS parallel file systems.)

Recent Publications: (since September)

1. Alok Choudhary, William Hendrix, Kathy Lee, Diana Palsetia, and Wei-keng Liao. Social Media Evolution of The Egyptian Revolution. In the Communications of the ACM, Volume 55 Issue 5, pages 74-80, May 2012.
2. Rob Latham, Chris Daley, Wei-keng Liao, Kui Gao, Rob Ross, Anshu Dubey and Alok Choudhary. A Case Study for Scientific I/O: Improving the FLASH Astrophysics Code. In the Computational Science and Discovery, vol. 5, 2012. DOI. 10.1088/1749-4699/5/1/015001
3. William Hendrix, Isaac Tetteh, Ankit Agrawal, Fredrick Semazzi, Wei-keng Liao, and Alok Choudhary. Community Dynamics and Analysis of Decadal Trends in Climate Data. In the Workshop on Knowledge Discovery from Climate Data: Prediction, Extremes, and Impacts, held in conjunction with the the IEEE International Conference on Data Mining, December 2011.
4. Kunpeng Zhang, Yu Cheng, Yusheng Xie, Ankit Agrawal, Diana Palsetia, Kathy Lee, Wei-keng Liao, and Alok Choudhary. SES: Sentiment Elicitation System for Social Media Data. In the Workshop on Sentiment Elicitation from Natural Text for Information Retrieval and Extraction, held in conjunction with the IEEE International Conference on Data Mining, December 2011.
5. Yu Cheng, Kunpeng Zhang, Yusheng Xie, Ankit Agrawal, Wei-keng Liao, and Alok Choudhary. Learning to Group Web Text Incorporating Prior Information. In the Workshop on Optimization Based Methods for Emerging Data Mining Problems, held in conjunction with the the IEEE International Conference on Data Mining, December 2011.
6. Kui Gao, Chen Jin, Alok Choudhary, and Wei-keng Liao. Supporting Computational Data Model Representation with High-performance I/O in Parallel netCDF. In the EEE International Conference on High Performance Computing, December 2011.
7. Yuhong Zhang, Md. Mostofa Ali Patwary, Sanchit Misra, Ankit Agrawal, Wei-keng Liao, and Alok Choudhary. Enhancing Parallelism of Pairwise Statistical Significance Estimation for Local Sequence Alignment. In the Workshop on Hybrid Multicore Computing, held in conjunction with the IEEE International Conference on High Performance Computing, December 2011.
8. Chen Jin, Saba Sehrish, Wei-keng Liao, Alok Choudhary, and Karen Schuchardt. Improving the Average Response Time in Collective I/O. In the EuroMPI conference, Santorini, Greece, September 2011.

Software packages

• Parallel implementations for K-means data clustering algorithm -- including MPI, OpenMP, serial versions.