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Your search keyword '"Dritsas, Stylianos"' showing total 91 results
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91 results on '"Dritsas, Stylianos"'

1. Lexicon for classifying ear-canal shapes

Author

Martinez, J. C., Hwee, Goh Zhi, Yap, Luis, De Chua, Kenneth Wei, Kamath, Savitha, Chung, Conrad Kang Rui, Teo, Wendy Yu Bing, Tan, Charmaine Kai Ling, Dritsas, Stylianos, and Simpson, Robert E.

Published
2023
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20. Shrinkage prediction and correction in material extrusion of cellulose-chitin biopolymers using neural network regression.

Author

Dritsas, Stylianos, Ravindran, Revathi, Jian Li Hoo, and Fernandez, Javier G.

Subjects
*CHITIN, *BIOPOLYMERS, *THREE-dimensional printing, *HYDROTHERAPY, *VISCOELASTIC materials, *QUALITY control
Abstract

Loss of geometric accuracy due to shrinkage is a challenge in material extrusion of biological composites using water-based inks, such as the cellulose-chitin biopolymers used here. The shape of 3D printed objects often departs from the intended design geometry due to evaporative loss of water during curing. Moreover, such materials' viscoelastic characteristics result in complex volumetric changes that are difficult to predict and compensate for. We developed a prediction-correction scheme by 3D printing and scanning cylindrical and conic surfaces, computing the geometric deviations between designed and cured artefacts, and training a neural network such that given the machine path for a 3D print, the model can predict shrinkage deformations and apply adjustments on the generating machine paths to proactively compensate it. In this article, we present the shrinkage characteristics of the material used and the results of applying the predictor-correction scheme. The approach substantially improves geometric accuracy, enabling nearly seamless assembly of separately 3D printed parts. Addressing such a fundamental problem of quality control as geometric accuracy may enable the broader adoption of biopolymers and potentially displace the generalised use of synthetic plastics. [ABSTRACT FROM AUTHOR]

Published
2023
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45. Design operators

Author

William L. Porter., Massachusetts Institute of Technology. Dept. of Architecture., Dritsas, Stylianos, 1978, William L. Porter., Massachusetts Institute of Technology. Dept. of Architecture., and Dritsas, Stylianos, 1978

Abstract

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2004., Includes bibliographical references (leaves 58-61)., Design operators is a thesis that investigates the nature and characteristics of the design process by examining the interaction of computation with architectural design. The effects of the introduction of these media in design are traced and their quantitative and qualitative characteristics are identified. The thesis hints for an emerging design mentality delineated by the implementation, documentation and critical evaluation of a series of experimental projects in computational design., by Stylianos Dritsas., S.M.

Published
2005

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