This page provides a brief introduction on a number of selected research
projects that I have done.
- EML: EML is an E-model data query language
extending the SQL-89 standard with enhanced features: (1)
unstructured query, (2) semantic query expansion, (3) temporal
query, (4) ranked ordering, (5) path query, and (6) natural join. An
E-model prototype is implemented on top of relational database.
Hundreds of SQL procedures and functions are developed to support
full operations. The idea is that a database system adds the E-model
database to existing databases, then a user can query the database
in the mixture of structured queries and E-model queries. EML
implements such ideas with an extended SQL language that supports
both structured and unstructured queries with various feature
- EFIM: EFIM is a prototype information
system development project using an event-based function information
model. This project pursues to develop a new information engine for
information chronicling. To meet complex demands in heterogeneous
data archiving, EFIM has a number of unique features: unified data
indexing, progressive event logging and trace back supports,
behavior pattern generation and matching, and functional
summarization in multiple levels of granularity.
- eChronicle: eChronicle is an information
chronicling system that supports general purpose information
archiving using its specialized information model and the EFIM
back-end. It features using events as its core to organize the
- Personal chronicling
tools: PCT supports
enterprise knowledge workers for digital event archiving and
collaboration-oriented publishing. PCT is composed of four primary
tools: (1) event monitoring, (2) interactive annotation, (3)
browse/search, and (4) edit/publish. All are designed to exploit
existing enterprise infrastructure, storing captured raw data and
metadata in secure databases. PCT is developed during my summer IBM
research internship in 2004 at IBM T.J. Watson research
- Media event tagging
system: METS is a
multimedia event processing system that combines human expertise
with algorithmic processing capabilities. Our approach pursues to
bridging the “signal-to-symbol” barrier which is based on a
3-layered event-processing architecture composed of a lower data
event layer, higher domain event layer, and an elemental event layer
in the middle, which links data and domains with symbolic indices.
METS is supported by HP Labs and I was the main developer.
- Experiential meeting
system: EMS is an
experiential meeting system to allow people to be tele-present in a
remote meeting and to be able to review proceedings of a meeting or
of several meetings using all the data recorded in a meeting. We
consider this as a problem in management and experiential access to
all multimedia data acquired in a meeting.
- Hierarchical mean field algorithms for stereo vision: HMEAN builds
the 3-D disparity map from two binocular images. It is featured in
three contributions: (1) horizontal and vertical line processes to
detect the matching point, (2) hierarchical architecture to minimize
the disparity errors in MRF(Markov random fields) modeled 3-D
worlds, (3) robust parameter optimization techniques.
GIS information processing
- Container ship pattern
The CSPR project is to recognize the container ship entering the
harbor gate to control their access and manage according harbor
assets to have the traffic flow efficient and cost-minimizing
purposes. Our team is currently working with the U.S. States
government engineering team to exploit its usage on the the Georgia
Savannah harbor. This project is
launched in 2007 and currently under extensive research reviews to
specify its topics and coverage.
Software development (selected)
- Roughing mill process design software
RMSIM is an enginerring software package
composed of 0.25 million lines MFC/C++ codes with hundreds of
classes. It gives users the power to design the complex roughing
mill plant design. Its simple interface with highly automated
parameter setting features astonished users in the industry. At the
time it was developed, RMSIM was the
only software in the world that supports the full roughing mill
plant design, plant simulation and computing optimal production
schedules. This is funded by POSCO for 3
years (1999-2001) with $0.5 million and I, as the main software
developer in this project, converted existing FORTRAN simulation
codes into C++ and all other GUI interfaces.
- Finishing mill setup simulator
FSUSIM is a finishing mill line
simulation software which is built on top of real plant operation
data. FSUSIM provides fully interactive
GUIs for users as if they actually set up the product schedule with
the real operation data. This software was at first developed for
the research simulation and later being populated by the workers at
the plant. I was invited to give talks and educate users on
FSUSIM three times.
FSUSIM is funded by
POSCO for two years (1995-1996) with $0.2
- Heavy ingot reduction scheduler (HIRS):
HIRS is an engineering software producing
the optimized ingot reduction schedule.
HIRS algorithms are developed by
extensive FEM (Finite Element Method) simulation results with two
years on-line operation data.
- Scale prediction software for finishing mill and downcoiler
predicts the scale thickness during air-cooling time when a downcoil
passed the final finishing mill line in the hot-coil and is placed
at the yard for cooling. SPFM simulates
3-dimensional temparature environments using non-linear computation
libraries. We developed the main SPFM
algorithm with extensive engineering data for simulation.
SPFM comes with 3D analysis and display
packages to visualize the growth of scales on coil over time.
Industrial automation (selected)
- Real-time hot slab warping control system
RTWARP is a real-time video processing
system working in hazardous steel plant environments.
RTWARP also controls the roughing mill
system to flatten the warp that causes serious impair of the roll
and even stopping the steel production.
RTWARP detects and measures the
curvature of the slab end in real time and controls the milling
speed in real time. The RTWARP project
was funded by POSCO for 3 years with $1.5
million budget. I joined RTWARP at its
2nd year (1994) as the main hardware and software engineer to
developed the next generation RTWARP to
enhances its performance and stabilize the system.
RTWARP won several major awards and
also copied to other steel plants successfully.
- Slab size meter using laser range sensors
(SSM): SSM is a
real-time sensing system prototype to measure the size of a moving
slab in real time using three laser range sensors and one
tachometer. SSM was built in 1995 at
POSCO and achieved 0.1 mm accuracy in
- Precise roll gap setup technology for edger roll in roughing mill
is developed to measure the diameter of the edger roll in roughing
mill to set up the slab width with very high accuracy. It is
installed directly under the rough mill and regularly measures the
edger gap width. The roll gap is measured using the robotic arm
equipped with LVDT (Linear Vertical Displacement Transducer) and
built on top of the hydro-powered telescopic cylinder for up and