Dept. of Computer Science
University of Maryland
College Park, MD 20742
(O)  301-405-8162 (H) 301-982-1157 (FAX) 301-405-6707
Email: kdryu@cs.umd.edu
Web: http://www.cs.umd.edu/~kdryu

RESEARCH INTEREST

• Cluster Computing, Meta (Grid) Computing
• High Performance Distributed and Parallel Systems
• Wide-Area Distributed Information Systems
• Computer Networks

• 9/1995 - Present    Ph.D candidate in Computer Science

                              University of Maryland, College Park (GPA 3.91)
                                  (Advisor: Dr. Jeffrey Hollingsworth, Expected Graduation: May 2001)
                                  (Thesis: Using Idle Resources in Networks of Workstations)
• 9/1995 - 12/1997     M.S in Computer Science

                              University of Maryland, College Park (GPA 3.90)
                                  (Advisor: Dr. Jeffrey Hollingsworth)
• 3/1993 -   2/1995     M.S. in Computer Engineering

                               Seoul National University, Seoul, Korea (GPA 4.0)
                                  (Advisor: Dr. Hyoung-Joo Kim)
                                  (Thesis: Extending C++ for Transparent Client Server Computing)
• 3/1988 -   2/1993     B.S. in Computer Engineering

                               Seoul National University, Seoul, Korea (GPA 3.65)
                                  (Graduated with honors, Cum Laude)

• 6/1997 - Present    Graduate Research Assistant

                                   Dept. of Computer Science, University of Maryland, College Park
                                  (Project: Active Harmony: Global Resource Management)
• 9/2000 - 12/2000     Research Intern

                                   IBM T.J. Watson Research Center, Hawthorne, NY
                                  (Project: Oceano: multi-enterprise web hosting infrastructure)
• 9/1995 -   5/1997     Graduate Teaching Assistant

                                   Dept. of Computer Science University of Maryland, College Park
                                  (Computer Architectures, Database Design, Computer Networks and more)
• 3/1993 -   5/1995     Graduate Research Assistant

                                  Object-Oriented Systems Lab. Dept. of Computer Engineering
                                   Seoul National University, Seoul, Korea
                                  (Project: SNU Client-Server Relational DBMS Platform)
• 3/1995 -   4/1995     Instructor

                                  Bit Computer Institute, Seoul Korea
                                  (Lecture and Lab: C++, Assembly Language)
• 6/1993 -   8/1993     Instructor

                                   Education and Research Computer Center
                                   Seoul National University, Seoul, Korea
                                   (Lecture: C++, Object-Oriented Database)

• Adaptive Computing on Networks of Workstations

(Distributed and Parallel Systems, Operating Systems; Ph.D. Research)
Developing the Linger-Longer system to better support background sequential
and parallel jobs running by harvesting idle resources from Networks of Workstations
(June,1997 to present)
• Block Paging in Linux
  (Operating Systems, Parallel Systems; Internship at IBM TJ Watson Research Center)
  Designed and Implemented Block Paging in Linux kernel to support efficient gang scheduling in a linux cluster.
  The results showed that our Block Paging using user-level scheduler information can reduce up to
  70% of memory paging overhead. (Sep. 2000 to Dec. 2000)
• Linux Cluster Administration

(Distributed and Parallel Systems, Operating Systems)
Administrating twelve pentium II PC cluster running Linux OS. The machines
are connected in two ways:Gigabit Mirinet Switch and 100 Mbps switched
ethernet. The cluster usually running parallel jobs and resource-intensive sequential jobs.
(July, 1998 to present)
• Simulation Study on Dynamic Parallel Application Adaptation

(Distributed and Parallel Systems; Class Project)
Conducted simulation study to investigate use of NOW to run parallel applications
utilizing idle cycles. Process number adaptation and process migration techniques were investigated.
(4 months)
• Temporally Deterministic TCP/IP Implementation on Maruti Hard Real Time System

(Computer Network ; Real Time Systems; Class Project)
Implemented TCP/IP protocol on MARUTI hard real-time system
to support temporally deterministic communications. (4 months)
• Multi-user DBMS Implementation

(Database; Class Project)
Implemented a small relational DBMS engine from scratch.
It includes page buffer manager, unordered file layer, B+ tree index,
query processor, simple query optimizer and concurrency controller
to support multiple users. (4 months)
• C++ Language Extension for Transparent Client-Server Computing

(Distributed System; Master thesis)
Developed CSC++ (Client-Server C++) preprocessor and run-time library
based on socket interface to support Transparent Client Server Computing
in heterogeneous environment: MS Windows and Unix. (2 years)

      Book Chapters

• Resource-Aware Meta-Computing

Jeffrey K. Hollingsworth, Peter Keleher and Kyung D. Ryu
In Advances in Computers Vol 53, edited by Marvin V. Zelkowitz, Academic Press, 2000.

• Exploiting Fine Grained Idle Periods in Networks of Workstations

Kyung D. Ryu and Jeffrey Hollingsworth
In IEEE Transactions on Parallel and Distributed Systems (TPDS), Vol 11(7), July 2000.
• Extending C++ Language to support Client-Server Computing

Kyung Dong Ryu, Kang-Woo Lee and Hyoung-Joo Kim
Journal of Korean Information Science Society, Part B, March 1996

• Rate Windows for Efficient Network and I/O Throttling

Kyung Dong Ryu, Jeffrey K. Hollingsworth and Peter Keleher
submitted for publication, 2000.
• Mechanisms and Policies for Supporting Fine-Grained Cycle Stealing

Kyung Dong Ryu, Jeffrey K. Hollingsworth and Peter Keleher
In the 18th ACM Int'l Conference on Supercomputing (ICS'99),Rhodes Greece, June 1999.
• Linger-Longer: Fine-Grain Cycle Stealing for Networks of Workstations

Kyung Dong Ryu and Jeffrey K. Hollingsworth
In SC'98 (Supercomputing), Orlando Florida, September 1998.

• ACM SIGMETRICS Travel Stipend Award from Telegif, 1999.
• Samsung Science Thesis Competition Finalist, 1998
• Graduated with Honors, Cum Laude, from Seoul National University, Feb 1993.
• Scholarship from Iljoo Scholarship Foundation, 1995-2000
• Scholarship from IBM Korea, 1993-1994
• Scholarship from Korea Electrics and Communications, 1991-1992.
• Scholarship from Seoul National University, 1990

• Refree for Real Time Systems Symposium(RTSS),  International Parallel Processing Symposium(IPPS),

International Journal of High Performance Computing Applications, International Parallel and Distributed Processing Symposium(IPDPS).
• Student Member of Graduate Program Admission Commitee in Computer Science at UMCP (1998-2000)
• President of Korean Graduate Student Assoication in Computer Science at UMCP (1996-1997)

    Language: English (fluent), Korean (mother tongue), German (a little)
    Computer:

•   Language: C/C++, JAVA, Lisp, Prolog, Tk/Tcl, HTML, AWK
•   Operating Systems: UNIX(Solaris, Linux) and X Windows, MS Windows, Mac OS
• *Simulation: using CSIM.
• *OS Kernel Extension: Linux kernel modification for resource management

                                    (CPU, memory, I/O and Comm. throttling)
                                    TCP/IP porting on a Real-Time OS
                                    (Thorough knowledge on Linux at source code level)
• System Softwares and Tool Kits: TCP/IP, Winsock, PVM
• Applications: MS office applications, Oracle DBMS(ESQLC) and others

         available upon request.