Speech is a complex signal produced by a highly constrained articulation machinery. Neuro and psycholinguistic theories assert that speech can be decomposed into molecules of structured atoms. Although characterization of the atoms is controversial, the experiments support the notion of invariant speech codes governing speech production and perception. We exploit deep neural network (DNN) invar...

We study the action of G = SL(2,R), viewed as a group definable in the structure M = (R,+,×), on its type space SG(M). We identify a minimal closed G-flow I, and an idempotent r ∈ I (with respect to the Ellis semigroup structure ∗ on SG(M)). We also show that the “ideal group” (r ∗ I, ∗) is nontrivial (in fact it will be the group with 2 elements), yielding a negative answer to a question of Ne...

A major bottleneck in the development of practical spoken language (SL) applications is the interface between the SL system and back-end application software. In theory, the range of potential back-end software for an SL interface is unlimited, but integration of an SL system with other software requires adapting the SL system to conform to the input formats of the back end. This is typically a...

We discuss the string theory on AdS3. In the first half of this talk, we review the SL(2, R) and the SL(2, C)/SU(2) WZW models which describe the strings on the Lorentzian and Euclidean AdS3 without RR backgrounds, respectively. An emphasis is put on the fundamental issues such as the unitarity, the modular invariance and the closure of the OPE. In the second half, we discuss some attempts at c...