Dimitrios Liarokapis
65 Middle Street,
Boston, MA 02127
(617) 4640277
dimitris@cs.umb.edu

EDUCATION

12/01. University of Massachusetts Boston, PhD in Computer Science with research interest in Databases. Dissertation Title: "Testing Isolation Levels of Relational Database Management Systems." Courses included : DATABASE INTERNALS (B-trees, Bitmaps, Concurrency Control, Isolation Levels, OLAP, Data Cube, Predicate Locking, Phantom Problem, Key Range Locking), HIGHER LEVEL LANGUAGES (Java Virtual Machine, Reflection, Metaobject Protocol, CLOS), PARALLEL COMPUTING (data parallel programming, shared memory thread programming and message passing; used Java Threads, HPFortran and Occam), DATA MINING SEMINAR (Mining association rules with the apriori algorithm, Learning Bayesian Networks, etc.)
5/91. University of Massachusetts Boston, MS in Computer Science, 3.92 GPA. Courses included: Advanced Software Engineering stressing Object Oriented Design, Data Base Management and Architecture, Compilers, Computer Networks, Computer Architecture, Digital Image Processing, etc.
6/89. University of Patras, Greece, Department of Computer Engineering and Informatics, 5-year degree(BS+). Special courses included: Statistics, Queuing Theory, Scientific Computing, Systems Theory, Stochastic Signals, Digital and Analog Electronics, Digital Telecommunications, Parallel Systems, VLSI, etc.

SOFTWARE KNOWLEDGE

OS: Unix, WinNT, VMS, Macintosh Toolbox, X Windows.
Languages: C, Java, SQL, C++, ADA, Pascal, LISP, FORTRAN, 68000 & 6502 assembly.
Databases: Oracle, DB2, Informix, Object Store, INGRES, Access, MAPPER.
Document Preparation: HTML, XML, MSWord, PW, LaTeX, TeX.
Network Protocols: TCP/IP.

HARDWARE KNOWLEDGE

Basic sequential and combinatorial logical circuits and lab tools.
Educational microprocessor boards (Rockwell, Motorola).
PC, Mac, and Workstations (installing and configuring peripherals and expansion cards).

EMPLOYMENT

10/99-present. Software Consultant, Intuit Boston, Waltham, MA. Participating in projects related to database support for an E-Commerce application, including stored procedure implementation, database performance measurements and creation of customized database reports. Using Oracle 8i, java, jdbc, servlets, XML and HTML. (Intuit is the company developing popular software for small businesses such as: QuickBooks, Quicken, TurboTax etc.)

7/99-9/99. Software Consultant, Frictionless Commerce, Cambridge, MA. Assisted in evaluating the deployment of an Object Oriented Database System (ObjectStore) for the persistence needs of company' s internet comparative shopping application. My contribution was to implement a port to ObjectStore with a minimal amount of software changes in order to perform comparative measurements between an OODB approach and the RDBMS approach that was used at the moment. Used ObjectStore 6.0, Java 1.2 and the VisualCafe IDE.

1/99-7/99. Principal Software Engineer, Plyasys Inc, Cambridge, MA. Implemented a Graphical User Interface (ACLStudio) for administering ACLBases. ACLBases are Accessor Control List Repositories that are used for Entitlement Management (ie. control of what user can access what object). They use bitmap technology for very fast adjudication of complex predicates (Entitlement Expressions). ACLStudio is a CORBA client to an ACLBase Server and is used to create and delete ACLBases, view the current contents of an ACLBase, create and delete new entities, import and export accessor, accessor lists and objects from/to SQL Tables (by using JDBC) and ascii files, evaluate current access and perform new entitlements. ACLStudio was implemented purely in Java by using the JBuilder2 IDE.

9/97-8/01. Database Administrator and Research Assistant, UMASS/Boston.

Supported DBA needs for classes and projects on several database systems: Oracle, DB2 and Informix.
Implemented a multithreaded application for examining the behavior and performance of vendor database systems running under different isolation levels. Used C, embedded and dynamic SQL, stored procedures etc. (NSF grant of Profs P. & E. O'Neil).
Participated in a www application for creating a Faculty Database (used applets, servlets, Java Web Server and Object Store).

6/95-8/97. Senior Software Engineer, True Software, Waltham, MA.(formerly SMDS). Participated in all phases of software development. Added new features in company's Software Configuration Management (SCM) product (used company's proprietary language Lakota), implemented automated test suites, fixed bugs, performed ports on UNIX and VMS platforms.

8/94-12/94. Software Consultant, Athens, Greece. Worked as a subcontractor in the automation of the General Store of Aluminium of Greece. It was a multiuser application and needed special attention for handling concurrency issues. Used Unisys' MAPPER.

6/92-6/94. Military Service, Hellenic Navy General Staff, Athens, Greece. Worked in the Office of Foreign Contracts. Used 386/486 PCs with Windows 3.1, and Word for Windows, Excel, and Access, etc., for maintaining information and producing reports regarding the surveillance of contracts, payments and loans and for preparing invitations for bids and other documents.

9/91-5/92. Software Engineer, SMDS, Concord, MA. Developed an ADA scanner to extract information (compilation units and dependencies), from ADA sources, related to configuration management. Worked in the encapsulation of Aide-de-Camp CM tool, the company's product, in the HP Softbench environment.

1/90-5/91. Research Assistant, University of Massachusetts Boston. Performed research related to digital typography and the psychophysics of visual perception. Implemented and maintained software for psychophysical experiments, in Think Pascal, on a Macintosh II.

PUBLICATIONS

"Prospective Surveillance of Hypertension in Firefighters", E. Soteriades, S. Kales, D. Liarokapis, D. Christani. Journal of Clinical Hypertension (in print). (Contributed in Statistical Analysis by using SAS)
"Lipid Profile of Firefighters Over Time: Opportunities for Prevention", E. Soteriades, S.Kales, D. Liarokapis, S. Christoudias, S. Tucker, D. Christiani. Journal of Occupational and Environmental Medicine, Vol 44, Num 9, Sep 2002. (Contributed in statistical analysis by using SAS.)
"Testing Isolation Levels of Relational Database Management Systems", Dimitrios Liarokapis, Doctoral Posters Presentation, VLDB 2002, Hong Kong, Aug 2002.
"How typeface variation and typographic scaling affect readability in small sizes". Robert A. Morris, Karl Berry, Kathryn A. Hargreaves, Dimitrios Liarokapis. Proceedings of the 7th International Congress on Advances in Non-Impact Printing Technologies, Portland Oregon, Oct.6-11, 1991, sponsored by the Society for Imaging Science and Technology.

EDUCATIONAL PROJECTS

Implemented a prototype for a database system that uses a combination of B-tree and Bitmap indexes. The index consists of a Btree. The nodes of the B-tree based on the cardinality of the indexed values were trasformed from RID lists to Bitmaps and reversely. Supported simple select statements and the common boolean operators. Implemented in C (UMASS/Boston 97).
Worked as a team member to implement an X Window interface for the Internet Statistics Collection Program (NNStat). Implemented in C on Sun 3 & Sun 4. Product provides a network image of local and other hosts displayed in a virtual circle. User can select, remove or rearrange hosts in the image, display a time-series for the traffic of a selected host or line and also see a history time-series over the last one hour. Responsibilities included: planning the project, specifying and analyzing the requirements, testing and documenting the product UMASS/Boston 90).
Wrote an elementary Pascal interpreter. Implemented: (a) constant and variable declarations of integer, real, char, string and array data types, (b) type checking by constructing and traversing a parse tree, (c) all the basic operations for the data types mentioned above using the Pascal association and precedence relations, (d) the basic statements: assignment, if-then-else, while-loop, for-loop, (e) code simplification and optimization. Used lex, yacc and C. (UMASS/Boston 90).

Last Revised: 07/07/03