Untitled

Funder

Organizational Unit

Publications

GyGSLA: A portable glove system for learning sign language alphabet

Publication . Sousa, Luis; Rodrigues, João; Monteiro, Jânio; Cardoso, Pedro J. S.; Lam, Roberto

The communication between people with normal hearing with those having hearing or speech impairment is difficult. Learning a new alphabet is not always easy, especially when it is a sign language alphabet, which requires both hand skills and practice. This paper presents the GyGSLA system, standing as a completely portable setup created to help inexperienced people in the process of learning a new sign language alphabet. To achieve it, a computer/mobile game-interface and an hardware device, a wearable glove, were developed. When interacting with the computer or mobile device, using the wearable glove, the user is asked to represent alphabet letters and digits, by replicating the hand and fingers positions shown in a screen. The glove then sends the hand and fingers positions to the computer/mobile device using a wireless interface, which interprets the letter or digit that is being done by the user, and gives it a corresponding score. The system was tested with three completely inexperience sign language subjects, achieving a 76% average recognition ratio for the Portuguese sign language alphabet.

2016Journal article

Open access

Categorified skew Howe duality and comparison of knot homologies

Publication . Mackaay, Marco; Webster, Ben

In this paper, we show an isomorphism of homological knot invariants categorifying the Reshetikhin-Turaev invariants for sl(n). Over the past decade, such invariants have been constructed in a variety of different ways, using matrix factorizations, category O, affine Grassmannians, and diagrammatic categorifications of tensor products. While the definitions of these theories are quite different, there is a key commonality between them which makes it possible to prove that they are all isomorphic: they arise from a skew Howe dual action of gl(l) for some l. In this paper, we show that the construction of knot homology based on categorifying tensor products (from earlier work of the second author) fits into this framework, and thus agrees with other such homologies, such as Khovanov-Rozansky homology. We accomplish this by categorifying the action of gl(l) x gl(n) on Lambda(P)(C-l circle times C-n) using diagrammatic bimodules. In this action, the functors corresponding to gl(l) and gl(n) are quite different in nature, but they will switch roles under Koszul duality.

2018Journal article

Open access