Joseph F. JaJa Institute for Advanced Computer Studies National Socio-Environmental Synthesis Center Department of Electrical and Computer Engineering University of Maryland College Park, MD 20742 Phone: 301-405-1925 Fax: 301-314-9658 Email: joseph at umiacs.umd.edu

Research Interests: High Performance and Data Intensive Computing, Web Archiving, Scientific Visualization, Long Term Data Management and Preservation.

Teaching:

• Fall 2012: ENEE244: Digital Logic Design
• Fall 2011: ENEE641: Mathematical Foundations for Computer Systems More details available through ELMS
• Spring 2010: ENEE459M: Topics in Computer Engineering: Machine Learning and Data Mining
• Fall 2009: ENEE752 - Computational Intelligence and Knowledge Engineering
• Spring 2009: ENEE324 - Engineering Probability

Biographical Sketch:

• Professor: Electrical and Computer Engineering, and Institute for Advanced Computer Studies, University of Maryland, and Director of Cyberinfrastructure, National Socio-Environmental Synthesis Center.
• 2010-2011: Interim VP and CIO, University of Maryland, College Park.
• 1994-2004: Director of the University of Maryland Institute for Advanced Computer Studies (UMIACS)
• 2002-2004: Interim Director of the Center for Bioinformatics and Computational Biology
• Ph.D. 1977, M.S. 1976, Applied Mathematics, Division of Engineering and Applied Physics, Harvard University.
• Over 160 refereed publications in parallel and distributed computing, data intensive computing, combinatorial algorithms, algebraic complexity, and VLSI architectures.
• IEEE and ACM Fellow
• more

Current Projects:

• A Time Machine for the Web. This project is developing a new approach and related core technologies that will allow users to search the web as it existed during a specific point or period in the past or to surf the web as it existed in the past.
• Simulation and Visualization of Large Scale Fluid-Structure Interactions. The main objective of this NSF-funded PetaApps project is the development of high-performance computing algorithms applicable to fluid-structure interactions in viscous incompressible flows. This project involves a collaboration between the University of Maryland and the University of Chicago FLASH Center.
• National Socio-Environmental Synthesis Center (SESYNC). The Center is dedicated to fostering actionable synthesis and scholarship related to the structure, functioning, and sustainability of socio-environmental systems. This project is developing computational tools and services to analyze, model, and visualize heterogeneous datasets from social and environmental sciences.
• ADAPT: An Approach to Digital Archiving and Preservation Technology. The ADAPT project is developing technologies for building a scalable and reliable infrastructure for the long-term access and preservation of digital contents. A particular focus concerns the development of methodologies to enable efficient and scalable information retrieval for a "time machine" for the web.
• Performance and Management of Distributed Heterogeneous Networks. A Partnership between the University of Maryland and the Laboratory for Telecommunications Sciences which involves a broad research program in networking and telecommunications technologies.

Selected Recent Publications:

• High Performance FFT Based Poisson Solver on a CPU-GPU Heterogeneous Platform, J. Wu and J. JaJa, International Parallel and Distributed Processing Symposium (IPDPS), May 2013, Boston, Massachusetts.
• Hierarchical Exploration of Volumes Using Multilevel Segmentation of the Intensity-Gradient Histograms, C. Yiu Ip, A. Varshney, and J. JaJa, VIS 2012, October 2012 (won Best Paper Award for SciVis 2012)
• An Effective Approach to Temporally Anchored Information Retrieval, Z. Wei and J. JaJa, UMIACS-TR-2012-10, University of Maryland, College Park, August, 2012.
• Optimized Strategies for Mapping Three-dimensional FFTs onto CUDA GPUs, J. Wu and J. JaJa, Proceedings of Innovative Parallel Computing (INPAR) Workshop, San Jose, CA, May 13-14, 2012.
• Constructing Inverted Files: To MapReduce or Not Revisited, Z. Wei and J. JaJa, Technical Report, University of Maryland, College Park, 2011. Also, to appear in IEEE Transactions on Parallel and Distributed Computing.
• A Fast Algorithm for Constructing Inverted Files on Heterogeneous Platforms, Z. Wei and J. JaJa, International Parallel and Distributed Processing Symposium (IPDPS), May 2011, Anchorage, Alaska.
• Optimization of Linked List Prefix Computations on Multithreaded GPUs Using CUDA, Z Wei and J. JaJa, International Parallel and Distributed Processing Symposium (IPDPS), April 2010, Atlanta, GA.
• Streaming Based Volume Ray Casting on the Cell Broadband Engine, J. Kim and J. JaJa, Scientific Programming, Special Issue on High-Performance Computing on the Cell BE, 17(number 1-2), 173-184, 2009.
• Techniques to Audit and Certify the Long Term Integrity of Digital Archives, S. Song and J. JaJa, International Journal of Digital Libraries, 2010.
• Quantifying the astrocytoma cell response to candidate pharmaceutical from F-ACTIN image analysis, Chi Cui, Joseph JaJa, Thomas Turbyville, John Beutler, Prabhakar Gudla, Kaustav Nandy and Stephen Lockett, EMBC2009, Minneapolis, Minnesota
• Interactive Direct Volume Rendering on Desktop Multicore Processors, Q. Wang and J. JaJa, Concurrency and Computation: Practice and Experience, 21, 2199-2212, September 2009.
• Robust Tools and Services for Long-Term Preservation of Digital Information, J. JaJa and S. Song, Library Trends Special Issue: Library of Congress National Digital Information and Preservation Parntership, 57:3, 580-594, 2009.
• Search and Access Strategies for Web Archives, S Song and J. JaJa, Proceedings of Archiving 2009, May 4-7, 2009.
• A Case Study in Distributed Collection Monitoring and Auditing Using the Audit Control Environment (ACE), M. Smorul and J. JaJa, Proceeding of Archiving 2009, 183-186, May 4-7, 2009.
• Streaming Model Based Volume Ray Casting Implementation for Cell Broadband Engine, Jusub Kim and Joseph JaJa, Proceedings of Eurographics Symposium on Parallel Graphics and Visualization, 2008.
• Fast Browsing of Archived Web Contents, Sangchul Song and Joseph JaJa, to appear in Proceedings of the International Web Archiving Workshop, September 18-19, 2008, Aarhus, Denmark.
• Archiving Temporal Web Information: Organization of Web Contents for Fast Access and Compact Storage, Sangchul Song and Joseph JaJa, UMIACS-TR-2008-08.
• Parallel Algorithms for Volumetric Surface Construction, J. JaJa, Q. Shi, and A. Varshney, a chapter in Parallel Computing: Models, Algorithms, and Applications, S. Rajasekaran and J. Reif, eds., Chapman & Hall/CRC, 2008.
• Interactive High-Resolution Isosurface Ray Casting on Multi-core Processors, Q. Wang and J. JaJa, IEEE Transactions on Visualization and Computer Graphics, 2008.
• An Efficient and Scalable Parallel Algorithm for Out-of-Core Isosurface Extraction and Rendering, Q.  Wang, J. J.JaJa, A. Varshney, Journal of Parallel and Distributed Computing, 67(5), 592-603, 2007.
• Component-based Data Layout for Efficient Slicing of Very Large Multidimensional Volumetric Data, Jusub Kim and Joseph JaJa, Proceedings of the 2007 International Conference on Scientific and Statistical Database Management, July 9-11, 2007, Banff, Canada.
• Information Aware Tree for Efficient out-of-core Indexing of Very Large Multidimensional Volumetric Data, Jusub Kim and Joseph JaJa, Proceedings of the 2007 International Conference on Scientific and Statistical Database Management, July 9-11, 2007, Banff, Canada.
• ACE: A Novel Software Platform to Ensure the Integrity of Long Term Archives, S. Song and J. JaJa, 90-93, Proceedings of the Archiving 2007 Conference, May 2007, Washington, DC. 
• New Techniques for Ensuring the Long Term Integrity of Digital Archives, Sangchul  Song and Joseph JaJa, Proceedings of the 8^th Annual International Conference on Digital Government Research, 57-65, Philadelphia, May 20-23, 2007.
• Isosurface Extraction and Spatial Filtering Using Persistent Octree (POT), Q. Shi and J. JaJa, IEEE Transactions on Visualization and Computer Graphics, 12(5), September/October 2006.
• Using Scalable and Secure Web Technologies to Design a Global Digital Format Registry Prototype: Architecture, Implementation, and Testing, M. Geremew, S. Song, and J. JaJa, Archiving 2006, 92-96, May 23-26, 2006, Ottawa, Canada.
• A Novel Information-Aware Octree for the Visualization of Large Scale Time-Varying Data, J. Kim and J. JaJa, UMIACS-TR-2006-03, University of Maryland, College Park, April 2006.
• Novel Transformation Techniques Using Q-Heaps with Applications to Computational Geometry, Q. Shi and J. JaJa, SIAM J. Computing, 34(6), 1471-1492, 2005.
• Optimal and Near-Optimal Algorithms for Generalized Intersection Reporting on Pointer Machines, Q. Shi and J. JaJa, Information Processing Letters, 95, 382-388, 2005.
• A New Framework for Addressing Temporal Range Queries with some Preliminary Results, Q. Shi and J. JaJa, Theoretical Computer Science, 332, 109-121, 2005
• Scalable, Reliable Marshalling and Organization of Distributed Large Scale Data Onto Enterprise Storage Environments, J. JaJa, M. Smorul, F. McCall, and Y. Wang, Proceedings of the NASA/IEEE Conference on Mass Storage Systems and Techniques, April 2005, Monterey, CA.

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Last Updated: January, 2012.