Project Computer Science
Resume:
Patrick Stein Minneapolis, MN ****9-1404
(formerly Patrick Fleckenstein) ***@******.***
http://www.csh.rit.edu/~pat/me/resume/
Objective
I am seeking challenging employment which will exercise and extend my skills. Jobs offering
a focus in mathematics, image processing, operating systems, or networking are preferred.
Publications
LUT Filters for Quantized Processing of Signals. Ricardo L. de Queiroz and Patrick Fleck-
enstein. IEEE Transactions on Signal Processing, Vol. 52, pp. 687 693 (March 2004).
Signal Processing Using LUT Filters Based on Hierarchical VQ. Ricardo L. de Queiroz and
Patrick Fleckenstein. Proceedings of IEEE International Conference on Acoustic, Speech, and
Signal Processing, (ICASSP), SPTM-P1 (May 2001).
Very Fast JPEG Compression Using Hierarchical Vector Quantization. Ricardo L. de Queiroz
and Patrick Fleckenstein. IEEE Signal Processing Letters, Vol. 7, No. 5 (May 2000).
Fast JPEG Encoding for Color Fax Using HVQ. Ricardo L. de Queiroz and Patrick Flecken-
stein. Proceedings of IS&T/SPIE Symposium on Electronic Imaging, Color Imaging, San Jose
(Jan 2000).
Patents
Patent 6,683,994: HVQ-based Filtering Method. Ricardo L. de Queiroz and Patrick Flecken-
stein. Issued January 27, 2004.
Patent 6,286,026: Method and Apparatus for Integrating Pull and Push Tasks in Pipeline
Data Processing. Dennis L. Venable, Patrick A. Fleckenstein, James E. Bollman. Issued
September 4, 2001.
Patent 6,292,168: Period-based Bit Conversion Method and Apparatus for Digital Image
Processing. Dennis L. Venable, Patrick A. Fleckenstein, William A. Fuss. Issued Septem-
ber 18, 2001.
Technical Familiarity
Languages: C++, Lisp, Perl, Unix shells, Objective-C, C, sed, make, Java, PHP, JSP, XML,
HTML, XSLT, CSS, and SQL. Also: lex, yacc, PostScript, python, Fortran, Modula-2, COBOL,
Logo, BASIC, and various assembly languages.
Operating Systems (and hardware): Mac OS X (x86/ppc), Linux (x86), Solaris and SunOS
(various), BeOS (x86), NetBSD (CCI Okee, x86, DECStation, Sparc), Ultrix (MIPS, DECStation,
KIMStation, VAX), System V/88 (Motorola 88k), and Windows NT/95/3.1 (x86).
Concepts and Packages: POSIX, STL, CORBA, UML, SDL, Kerberos V, XLib, threads, and
sockets. Also: emacs, vi, git, Subversion, CVS, LaTeX, noweb, gnuplot, and gcc/g++.
Mathematics & Computer Science Education
B.S. in Computational Mathematics from the Rochester Institute of Technology in Rochester, NY.
Mathematics courses include: Numerical methods, discrete mathematics, math modeling,
probability, applied statistics, set theory, abstract algebra, complex variables, real variables,
graph theory, game theory, number theory, differential equations, and topology.
Computer Science courses include: Data communications, data organization and manage-
ment, assembly language, and digital image processing.
Work Experience
Team lead and C++ developer
I am the team lead of and a developer for the Data Central Services team in the ERAM
Display Systems group and I am co-lead of the Display Systems failure analysis group.
We are developing the next generation of the National Air Traf c Control System. The
Data Central Services is responsible for the infrastructure used to synchronize display
settings between the active and backup channels of the system.
This work involved extensive development in C++, extensive debugging in a large C++/Ada
environment, and team management.
Lockheed Martin, Eagan, MN. 2010 present.
Information technology professional
For this team, I did development and maintenance for the University of Minnesota s
MyU Portal . A large piece of that effort involved collating, several times a day, disparate
data sources and learning tools into a cohesive list of courses for each of the 170,000
users. This job also required frequent culling of log outputs and databases to generate
reports and to narrow down problems.
I had toyed with Perl before this job. Thanks to this job, I am now an expert Perl pro-
grammer.
For this team, I also administered software packages and did user support for a small,
research computing cluster owned by the Department of Soil, Water, and Climate in the
College of Food, Agriculture, and Natural Resource Sciences.
University of Minnesota s Academic and Distributed Computing Services, Minneapolis, MN.
2007 2008.
System software engineer
On this project, I developed a geoimaging archive and access interface employing Google
Maps, Java, and SQL.
Earlier, we integrated the various science instruments on the NASA/USRA SOFIA project
and put the framework in place to allow relentless observing. I did a great deal of design
work and implementation for this project in C++, C, and Java with heavy use of CORBA,
XML, XSLT, JSP, and SQL.
Rochester Institute of Technology s Center for Imaging Science, Rochester, NY. 1999 2007.
Computer graphics programmer
In this position, I did a wide variety of things relating to digital image processing. For
the last year, I was lead programmer for our project. I received an appreciation award
for work I did with a sibling group to design an API for their toolkit and another award
for work I did integrating the image processing modules, communication module, and
user-interface for another project. I did a great deal in this position doing image com-
pression research, developing new image processing algorithms, creating and parsing
image description languages, creating user-interfaces, integrating large-scale projects,
and developing for platform-independence.
Xerox Corporation [DITC/Cadisys/Sandpiper], Rochester, NY. 1991 1995, 1996 1999.
Natural language database retrieval programmer
I hit the ground running when I joined this startup company. The company s lead prod-
uct is a natural language interface to several databases (focusing on software prior art
and nancial advising). The system architecture is client-server with the server being
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composed of many separate daemons running on an arbitrary number of machines. My
initial work on this product was implementing various sections of the server.
I quickly became involved in all aspects of the client-server system. I did much of the
work on the communications layers in both the client and server, chunks of the user-
interface, various logging and debugging mechanisms, and overall system integrity.
This project, even more so than my work at Xerox, highlighted my ability to see and
work with the gestalt in a complex system. I am quite proud of this ability.
Manning and Napier Information Services, Rochester, NY. 1995 1996.
Multimedia education software programmer (PanVision)
I designed and implemented (not necessarily linearly) a programming language for the
creation of multimedia applications under Windows 3.1. This software has been incorpo-
rated in several educational CD-ROMs geared toward German pre-reading-age students
and in several promotional CD-ROMs.
PanVision, Essen, Germany. 1994 1996.
Advanced research group member
As a member of the Advanced Research Group at Computer Science House, I have par-
ticipated in many projects. In addition to the day-to-day system administration of a
network of BSD, System V, and Ultrix machines, I have worked on software for our light
show, our Coke machine, and the four projects listed below.
Computer Science House, Rochester, NY. 1993 1998.
NetBSD kernel port
Two others and I (working from some sketchy documentation, the NetBSD Amiga
release, and the 4.3 BSD port for the Power 6/32) ported NetBSD to the CCI Power
6/40 Okee architecture. This project involved implementing
locore.s and the Okee speci c device drivers. Most of the work I did on this project
was in porting the device driver for the VersaBus SMD disk controller. I also assisted
in debugging several device drivers and the whole of locore.
X Windows Server port
Computer Science House received a large donation from Kodak of 2-bit grayscale,
high-resolution workstations. We ported the X Windows sample server to run on
these machines under Ultrix. I made many modi cations to the server code to get
the server functioning well, including many xes on the server side to deal with X
clients that were less-than-intelligent about dealing with 2-bit displays.
On this project, I learned X Windows from the inside out. I had perused Volume 0,
but the rest I learned from reading the include les. I have employed this method of
learning on various systems, and it has proved particularly effective for me.
Inferno DIS disassembler
I wrote a disassembler for DIS objects in C. I based it on the documentation provided
on the web about the DIS virtual machine. This project was the rst step toward
implementing a DIS virtual machine, but my interest in this project waned before
completion of the VM.
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Virtual Reality network
I was a key implementer and designer in the early revisions of the Virtual Real-
ity/Learning Systems Development project at Computer Science House. On this
project, I made extensive use of socket communication under Unix and AmigaDOS.
Other Programming Activities
Just Change Law
I designed an implemented this website/CMS using PHP and MySQL.
Just Change Law, St. Paul, MN. 2008 2009.
MN Writes
In less than a month of spare time, I did all of the PHP and MySQL which drove the now
defunct Minnesota Writes web site.
Minnesota Writes, Minneapolis, MN. 2005.
nklein software
I started the web site for the distribution of my own software projects. Most of my
focus has been on software with a multi-dimensional bent. Several of these projects are
highlighted below.
nklein software. 1998 present.
iPhone app for kids
I built an iPhone app that helps children learn to spell basic words in English,
French, or Spanish. I wrote the application in Objective-C atop the iPhone-cocos2d
framework. I did all interface design, artwork, and coding for this application.
n-dimensional raytracing
I have developed a raytracer which supports an arbitrary number of spatial dimen-
sions. It supports cylindrical objects (with an arbitrary number of round dimen-
sions), quadratic surfaces, CSG objects, convex hulls, Coxeter polytopes, extrusions,
arbitrary rotations, arbitrary scalings, JPEG output, ppm output, PostScript out-
put, multiple light sources, directional light sources, texture-mapping, re ections,
and refraction. The original implementation was in C++. There is a partial re-
implemenation in Common Lisp.
Clifford algebras library
I created a C++ template library for Clifford algebras and employed them to do color
convolution ltering and fractal generation.
I recently updated this library to allow one to do the wedge product in addition to
the Clifford product.
54321
This C++ program is ve games in four-, three-, and two-dimensions for one player.
This game won an honorable mention in the SDL 1MB Linux Game Programming
Contest sponsored by No Starch Press, Linux Journal, and Loki Software.
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DVD Tracks
I developed the entire DVD Tracks web site with PHP and MySQL in less than two weeks
of my spare time. This site is no longer in use.
DVD Tracks, Minneapolis, MN. 2002 2004.
Operating systems overview seminars
I prepared and gave a two-hour presentation on the fundamental concepts of mod-
ern operating systems. This presentation was given as the introductory session of the
Computer Science House Operating System Seminar Series. For this seminar, I focused
mainly on how system calls differ from library calls and how the operating system arbi-
trates device contention.
Computer Science House, Rochester, NY. 1996.
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