Meeting Agenda
Wednesday, 13 December 1995
- Location:
- DC 1304
- Time:
- 1:30 PM
- Chair:
- Stewart Chao
1. Adoption of the Agenda - additions or deletions
2. Coffee Hour
- Coffee hour this week:
- Wolfgang
- Coffee hour next week:
- ???
3. Next week's meeting
- Date:
- 20 December 1995
- Location:
- DC 1304
- Time:
- 1:30 PM
- Chair:
- Wilkin Chau
- Technical presentation:
- Leith Chan
4. Forthcoming
- Chairs:
- Bill Cowan
- Matthew Davidchuk
- Ed Dengler
- Tech Presenters:
- Leo Chan
- Stewart Chao
- Wilkin Chau
5. Technical Presentation
- Presenter:
- Ian Bell
Title:
A Figment of your Imagination
6. General Discussion Items
- Anne: What is a good time for meetings next term?
7. Action List
- Richard: Side FX visit; February
- Rob: U of T visit; March 8th
8. Director's Meeting
9. Seminars
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DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
MASTER'S THESIS PRESENTATION
-Thursday, December 14, 1995
Kar Yan Ng, graduate student, Dept. Comp. Sci., Univ.
Waterloo, will speak on "The Use of Test/Relational
Database System to Support Document Management".
TIME: 11:00 a.m. -12:00 p.m.
ROOM: DC 1331
ABSTRACT
Two major data models in which documents are
represented and stored are :
a relational data model, where all text contents in
a document are represented in relations, each with
several attributes, or
a text data model, where documents are represented
as contiguous characters, typically interspersed
with tags to capture their various logical,
semantic, and presentational features and
relationships
Each approach has its own strengths and limitations. In
our work, we study how a hybrid system based on a
combined text/relational model can support document
management. We describe database design trade-offs
involving the appropriate placement of information in
the text and relational database components. With an
appropriate design, the advantages of both models can
be exploited, while the shortcomings of using them
individually are diminished.
We propose a set of primitive operations and a
methodology of using it to evaluate the various
alternatives for data placement. The methodology
consists of simulating pre-defined, representative,
document management tasks using the primitive
operations and studying the numbers, types, and the
time performance of the operations involved.
Finally, we also pinpoint some directions for future
research.
=======================================================
DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
MASTER'S THESIS PRESENTATION
-Wednesday, December 20, 1995
Jonathan Man-Tsun Wong, graduate student, Dept. Comp.
Sci., Univ. Waterloo will speak on "A Graphical User
Interface for Data Entry and Querying in QL/G".
TIME: 11 a.m. - 12:00 p.m.
ROOM: DC 1331
ABSTRACT
A Spatial Database Management Systems (SDBMS) is a
database management system which allows to store,
manipulate and retrieve spatial data. In order for the
stored data to be of use it must be possible to express
them in some externally useful form. Therefore,
visualization is important to make the data accessible,
manageable and comprehensible. Furthermore, interaction
is also fundamental and crucial to spatial
visualization. This thesis will propose a graphical
user interface design providing interactive
visualization for data entry and querying in the
prototype QL/G which is a SDBMS developed at the
University of Waterloo.
=======================================================
DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
MASTER'S THESIS PRESENTATION
-Thursday, December 14, 1995
Don Peter Dragomatz, graduate student, Dept. Comp.
Sci., Univ. Waterloo will speak on "Numerical Control
Tool Path Generation Using Space-Filling Curves and
Pixel Models."
TIME: 2:00-3:00 p.m.
ROOM: DC 1331
ABSTRACT
Two methods for generating numerical control tool paths
have appeared recently, one using pixel models, the
other using Hilbert curves. The pixel model approach
is able to represent many aspects of path generation,
but requires large amounts of storage for physically
large objects represented at high accuracy. The
Hilbert curve approach uses the local refinement
property of Hilbert space-filling curves to create an
adaptive sampling approach that increases the density
of path points only where necessary. In this thesis, I
propose and implement a hybrid technique that uses
elements of each method, retaining the major benefits
of both without incurring the storage costs of the
pixel model. The scheme supports the creation of both
roughing paths and surface machining paths, but is
non-optimal for the latter. The addition of
containment and exclusion zones to the method leads to
a promising paradigm for partitioning object geometry
into machinable regions.
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DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
MASTER'S THESIS PRESENTATION
-Tuesday, December 19, 1995
Wolfgang Heidrich, graduate student, Dept. Comp. Sci.,
Univ. Waterloo, will speak on "Spline Extensions for
the MAPLE Plot System".
TIME: 10:00-11:00 a.m.
ROOM: DC 1304
ABSTRACT
Traditionally computer algebra systems use lines and
polygons to represent mathematical functions
graphically. While these geometric primitives can
easily be rendered on conventional raster graphics
hardware, a smooth representation using splines would
provide a wider range of tradeoffs between image
quality and rendering performance. Since modern
computer graphics hardware directly supports rendering
of spline objects, their use becomes more and more
interesting.
In this talk we examine the possibilities for replacing
traditional representations of functions and graphs by
spline representations. We describe the use of
B-splines for interpolation and approximation, and
discuss several approaches for generating
parameterizations for these tasks. Finally we present
some novel results regarding the use of rational
splines for curve and surface fitting.
10. Lab Cleanup (until 2:30 or 5 minutes)