NMT’s Computer Science and Engineering Education & Research Programs Dr. Lorie M. Liebrock Chair, Computer Science and Engineering

Associate Professor Ph.D., Computer Science, University of Massachusetts Subhasish Mazumdar Specialities Mobile data management Document databases Integrating heterogeneous data sources

Subhasish Mazumdar Sample Research: Mobile Data Management Mobile devices have increasingly powerful computational ability, but limited computing resources, e.g., battery, storage; possibility of disconnections in network connectivity; Likelihood of loss and theft. Can mobile users be empowered just like users on desktops? No! What if a mobile client locks server data and disconnects (voluntarily/involuntarily)? Server resources may become unavailable to all other clients forever!

Subhasish Mazumdar New solutions are needed to address integrity & security. Our approach assumes a three-tier architecture: (i)server, (ii)stationary support stations, and (iii) the mobile hosts; rewrites global constraints into sufficient local constraints; allows local execution when disconnected while enforcing global integrity constraints; thwarts attempts to reconstruct a database from a stolen portable device; or even from a single query; develops the idea of a lease, i.e., a contract along with the cached data; illuminates the interaction between lease durations and user authority levels; shows that changing range constraints on data in mobile hosts is useful for security.