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Outputs (663)

An Adaptive Course Generation Framework (2010)
Journal Article
Li, F., Lau, R., & Dharmendran, P. (2010). An Adaptive Course Generation Framework. International Journal of Distance Education Technologies, 8(3), 74-85. https://doi.org/10.4018/jdet.2010070104

Existing adaptive e-learning methods are supported by student (user) profiling for capturing student characteristics, and course structuring for organizing learning materials according to topics and levels of difficulties. Adaptive courses are then g... Read More about An Adaptive Course Generation Framework.

Technology Supports for Distributed and Collaborative Learning over the Internet (2008)
Journal Article
Li, Q., Lau, R., Shih, T., & Li, F. (2008). Technology Supports for Distributed and Collaborative Learning over the Internet. ACM Transactions on Internet Technology, 8(2), Article 10. https://doi.org/10.1145/1323651.1323656

With the advent of Internet and World Wide Web (WWW) technologies, distance education (e-learning or Web-based learning) has enabled a new era of education. There are a number of issues that have significant impact on distance education, including th... Read More about Technology Supports for Distributed and Collaborative Learning over the Internet.

Multi-pen Sketch Recognition in a Learning Environment. (2009)
Journal Article
Don, L., & Ivrissimtzis, I. (2009). Multi-pen Sketch Recognition in a Learning Environment. Journal of multimedia, 4(2), 80-86. https://doi.org/10.4304/jmm.4.2.80-86

Virtual physics environments are becoming increasingly popular as a teaching tool for high school level mechanical physics. While useful, these tools often offer a complex user interface, lacking the intuitive nature of the traditional whiteboard. Fu... Read More about Multi-pen Sketch Recognition in a Learning Environment..

An Efficient Method for Simulating Flexible Connectors (2009)
Journal Article
Li, F., Zhao, J., Lam, B., & Lau, R. (2009). An Efficient Method for Simulating Flexible Connectors. Journal of multimedia, 4(2), 94-100. https://doi.org/10.4304/jmm.4.2.94-100

Physically-based dynamic simulation has been an active research area for many years. It is an important technique to enhance the realism of interactive multimedia or computer graphics applications. However, while most of these applications require re... Read More about An Efficient Method for Simulating Flexible Connectors.

An interpolating 4-point C2 ternary stationary subdivision scheme (2002)
Journal Article
Hassan, M., Ivrissimtzis, I., Dodgson, N., & Sabin, M. (2002). An interpolating 4-point C2 ternary stationary subdivision scheme. Computer Aided Geometric Design, 19(1), 1-18. https://doi.org/10.1016/s0167-8396%2801%2900084-x

A novel 4-point ternary interpolatory subdivision scheme with a tension parameter is analyzed. It is shown that for a certain range of the tension parameter the resulting curve is C2. The role of the tension parameter is demonstrated by a few example... Read More about An interpolating 4-point C2 ternary stationary subdivision scheme.

Modal liquid crystal devices in optical tweezing: 3D control and oscillating potential wells (2006)
Journal Article
Hands, P., Tatarkova, S., Kirby, A., & Love, G. (2006). Modal liquid crystal devices in optical tweezing: 3D control and oscillating potential wells. Optics Express, 14(10), 4525-4537. https://doi.org/10.1364/oe.14.004525

We investigate the use of liquid crystal (LC) adaptive optics elements to provide full 3 dimensional particle control in an optical tweezer. These devices are suitable for single controllable traps, and so are less versatile than many of the competin... Read More about Modal liquid crystal devices in optical tweezing: 3D control and oscillating potential wells.

The refinability of the 4-point scheme. (2002)
Journal Article
Ivrissimtzis, I., Dodgson, N., Hassan, M., & Sabin, M. (2002). The refinability of the 4-point scheme. Computer Aided Geometric Design, 19(4), 235-238

Evolutions of Polygons in the Study of Subdivision Surfaces (2004)
Journal Article
Ivrissimtzis, I., & Seidel, H. (2004). Evolutions of Polygons in the Study of Subdivision Surfaces. Computing, 72(1-2), 93-103. https://doi.org/10.1007/s00607-003-0049-8

We employ the theory of evolving n-gons in the study of subdivision surfaces. We show that for subdivision schemes with small stencils the eige¬nanalysis of an evolving polygon, corresponding either to a face or to the 1-¬ring neighborhood of a verte... Read More about Evolutions of Polygons in the Study of Subdivision Surfaces.

A Trajectory-Preserving Synchronization Method for Collaborative Visualization (2006)
Journal Article
Li, L., Li, F., & Lau, R. (2006). A Trajectory-Preserving Synchronization Method for Collaborative Visualization. IEEE Transactions on Visualization and Computer Graphics, 12(5), 989-996. https://doi.org/10.1109/tvcg.2006.114

In the past decade, a lot of research work has been conducted to support collaborative visualization among remote users over the networks, allowing them to visualize and manipulate shared data for problem solving. There are many applications of colla... Read More about A Trajectory-Preserving Synchronization Method for Collaborative Visualization.

A generative classification of mesh refinement rules with lattice transformations (2004)
Journal Article
Ivrissimtzis, I., Dodgson, N., & Sabin, M. (2004). A generative classification of mesh refinement rules with lattice transformations. Computer Aided Geometric Design, 21(1), 99-109. https://doi.org/10.1016/j.cagd.2003.08.001

We give a classification of subdivision refinement rules using similarity transformations of lattices. Our work expands recent results in the classification of primal triangular subdivision. In the examples we concentrate on the cases with a low rati... Read More about A generative classification of mesh refinement rules with lattice transformations.

Variational Bayesian noise estimation of point sets. (2009)
Journal Article
Yoon, M., Ivrissimtzis, I., & Lee, S. (2009). Variational Bayesian noise estimation of point sets. Computers and Graphics, 33(3), 226 - 234. https://doi.org/10.1016/j.cag.2009.03.019

Scanning devices acquire geometric information from the surface of an object in the form of a 3D point set. Such point sets, as any data obtained by means of physical measurement, contain some noise. To create an accurate model of the scanned object,... Read More about Variational Bayesian noise estimation of point sets..

Surface and normal ensembles for surface reconstruction (2007)
Journal Article
Yoon, M., Lee, Y., Lee, S., Ivrissimtzis, I., & Seidel, H. (2007). Surface and normal ensembles for surface reconstruction. Computer-Aided Design, 39(5), 408-420. https://doi.org/10.1016/j.cad.2007.02.008

The majority of the existing techniques for surface reconstruction and the closely related problem of normal reconstruction are deterministic. Their main advantages are the speed and, given a reasonably good initial input, the high quality of the rec... Read More about Surface and normal ensembles for surface reconstruction.

Incremental polygonization of deforming NURBS surfaces. (1999)
Journal Article
Li, F., & Lau, R. (1999). Incremental polygonization of deforming NURBS surfaces. Journal of graphics tools (2012), 4(4), 37-50. https://doi.org/10.1080/10867651.1999.10487514

Nonuniform rational B-splines (NURBS) are a powerful tool to model deformable objects. Their shapes can be easily modified by moving the control points. A common method used to render these objects is polygonization. However, the polygonization proce... Read More about Incremental polygonization of deforming NURBS surfaces..

Orientation and solvatochromism of dyes in liquid crystals (2003)
Journal Article
Palsson, L., Szablewski, M., Roberts, A., Masutani, A., Love, G., Cross, G., …Yasuda, A. (2003). Orientation and solvatochromism of dyes in liquid crystals. Molecular Crystals and Liquid Crystals, 402(1), 43-53. https://doi.org/10.1080/744816685

The orientation and solvatochromism of some dye molecules in a liquid crystal have been investigated. Interactions with the host and the structure of the dye molecule affect the macroscopic alignment of dichroic dye molecules in a liquid crystal: It... Read More about Orientation and solvatochromism of dyes in liquid crystals.

Fast, large and controllable phase modulation using dual frequency liquid crystals (2004)
Journal Article
Kirby, A., & Love, G. (2004). Fast, large and controllable phase modulation using dual frequency liquid crystals. Optics Express, 12(7), 1470-1475. https://doi.org/10.1364/opex.12.001470

We report on a method for high speed, large stroke phase modulation using dual frequency control of liquid crystals. Our system uses an all-electronic feedback system in order to simplify the control. We show half wave phase modulations of ~120Hz wit... Read More about Fast, large and controllable phase modulation using dual frequency liquid crystals.

A Shack-Hartmann wavefront sensor projected on to the sky with reduced focal anisoplanatism (2006)
Journal Article
Butterley, T., Love, G., Wilson, R., Myers, R., & Morris, T. (2006). A Shack-Hartmann wavefront sensor projected on to the sky with reduced focal anisoplanatism. Monthly Notices of the Royal Astronomical Society, 368(2), 837-843. https://doi.org/10.1111/j.1365-2966.2006.10160.x

A method for producing a laser guide star wavefront sensor for adaptive optics with reduced focal anisoplanatism is presented. A theoretical analysis and numerical simulations have been carried out and the results are presented. The technique, named... Read More about A Shack-Hartmann wavefront sensor projected on to the sky with reduced focal anisoplanatism.