JavaGrid A Java High Performance Computing and Communication Framework for multi physics simulation.
ShowMe3D A visualization and debugging tool for various 3D formats dealing with JavaGrid.
JGrass A Java benchmark suite for scientific High Performance Computing and Communication.
JavaPar Internet based Parallel Computational Fluid Dynamics Solver using the Java-Thread Concept.
Current CFD codes are mostly written in Fortran. Only few  codes have been implented in  C. The major benefits derived from object-oriented-programming techniques and the world-wide-web with its collaborative engineering and multimedia features, therefore, cannot directly be implemented in these codes. Maintaining, understanding or extending these codes is a costly and  highly errorprone undertaking . Paralleization has to be achieved via parallel libraries that also have to be maintained. Dynamic loadbalancing cannot be obtained directly, but needs a dedicated effort.  A GUI for such a code generally is written in TCL/TK or Java. However, Java is not only the language for the Internet but also the lanuage  for computational science and engineering, as has been shown by  Geoffrey Fox, NPAC  and others. This project, therefore, has the goal to produce a fully 3D parallel Navier-Stokes solver completely		written in Java, capable of handling any type of geometrical complexity, like ParNSS, that is portable, based on the client-server concept and, at the same time, is fully WWW capable, supporting the exchange of construction data, computed results, and project status information in multimedia format, using a web browser as well as Java applets. The Java Thread concept is a unique feature for code parallelization based on the decomposition of complex multiblock grids,  generated, for example, by  GridPro .  Threads are dynamically  implemented  by the operating system, providing methods for communication  and thus will lead straightforwardly to a dynamically load-balanced application without having to use parallel libraries. Moreover, Java offers portability, object-oriented design, world-wide-web capability  as well as graphics features and the envrionment to quickly design a GUI.

Teaching Activities

Java for real beginners

is a one-semester free voluntary introduction into the java language and the java technologies.

An introduction into the programming language 'Java'

OOP, Java language syntax and semantics, AWT, Swing, IO, Threads, Debugging

Advanced programming in 'Java'

JDBC, RMI, Beans, Servlets, JSP, JNDI, JNI

Visualization and Multimedia with Java

Graphics 2D, Advanced Imaging API, Java Media FrameWork, Java 3D

High Performance Computing and Communications using 'Java'

Massive parallel Programming, Dynamic load balancing, Synchronization, ...

An introduction into UNIX system software development

is a one-semester free voluntary course containing the programming of system calls, processes, basic io, interprocess commumication, signals, pipes and network programming using sockets.

Advanced UNIX system software development and network administration

is a one-semester course containing the programming of threads, x11, OSF/Motif , the art of graphical user interface design and administaton of network services (NIS, DNS, LDAP, NFS, ...)

An introduction into the programming language 'C/C++'

is a one-semester course

Advanced programming in 'C/C++'

is a one-semester course

Papers

Häuser, Ludewig, Th., Gollnick, T., Williams, Roy D.
Javagrid: An Innovative Software for HPCC
paper presented at ECCOMAS Computational Fluid Dynamics 2001 Conference, Swansea, UK, September 4th to 7th, 2001

Häuser,J., Ludewig, Th., Williams, Roy D., Winkelmann, R., Gollnick, T., Brunett, S., Muylaert, J.
ATest Suite for High Performance Parallel Java
paper presented at NASA 5th National Symposium
on Large-Scale Analysis, Design and Intelligent Synthesis Environments
Williamsburg, VA, October 12th to 15th, 1999

Häuser,J., Ludewig, Th., Williams, Roy D., Winkelmann, R., Gollnick, T., Brunett, S., Muylaert, J.
NASA Panel Java Soundbytes
paper presented at NASA 5th National Symposium
on Large-Scale Analysis, Design and Intelligent Synthesis Environments
Williamsburg, VA, October 12th to 15th, 1999

Häuser J.,  Ludewig, Th., Gollnick T., Winkelmann R., Williams R. D., Muylaert J., Spel M.,
A Pure Java Parallel Flow Solver,
Proceedings of the 37th AIAII Aerospace Sciences Meeting and Exhibit, AIAA 99-0549
Reno, NV, USA, 11-14 January 1999.

Professional Experience and Skills

System Administrator


Operating Systems SPARC/x86 Solaris, SPARC SunOS (since 1990), DigitalUNIX, Ultrix, IRIX, Linux, MacOS, WinNT, Win95

Network Services NIS, NIS+, NFS, SMTP, SNMP, HTTP, FTP, NNTP, LDAP, SMB/CIFS

Programming Languages
1998 - Sun Certified Java Programmer
1995 - Java (jdk 1.0 alpha 3)
1993 - Perl
1991 - C++
1990 - UNIX System Administrator
1987 - Modula2
1986 - C, Pascal
1980 - Assembler


Z80, 8080, 8051, 80535, 8086-80486, 6502, 68HC11,
68000-68030, SPARC

1980 - BASIC


Database:
Oracle, Informix, MySQL, mSQL

Internet:


WebMaster (since 1992) Apache httpd, Java WebServer, Squid, CERN Jigsaw, NCSA httpd, CERN httpd, Netscape Enterprise, Netscape Fasttrack, Netscape Proxy Server

Programming and Development for the Web
Java Applets and Servlets
Common Gatway Interfaces (CGI) using Perl, C and C-Shell
Database to WWW connectivity (JDBC, Perl DBI/DBD, w3-msql)

Web Publishing
HTML, CSS, VRML, Java, JavaScript

Biographical Sketch

From 1987 to 1992 Thorsten Ludewig studied at the University of Applied Sciences, Braunschweig/Wolfenbüttel, Germany finishing with a Diploma in Computer Science. 

 

Since April 1992 Employee at computing center of the University of Applied Sciences, Braunschweig/Wolfenbüttel tasked with the development of software for UNIX systems and public internet services. 

 

Since 1996 Affiliated with Sun Microsystems - SunService as trainer for Java education. 

 

Since 1998 In 1998 Thorsten Ludewig has been project and team leader named for the UNIX workstations and servers including internet and intranet services, database servers, backup systems and for common system and data security at the computing center of the University of Applied Sciences.

TitleCentral Server and IT Division Head,
Computing Center, University of Applied Sciences Wolfenbuettel