Simulation vs experiments of vocalization in a long tube
Immune-inspired ultra-dense HetNets
Design of efficient decentralized decision-making algorithms for the control of distributed multi-agent systems is an open engineering problem. Currently, there is no state-of-the-art methodology that allows for the design of such agent decision-making algorithms that ensure the system’s robust self-organized behavior. Solution ideas are expected from biological multicellular systems where cells decide about their phenotype based on local interactions.
Bio-inspired self-organized networks
The project aims at the design of bio-inspired algorithms for the regulation of self-organized heterogeneous wireless networks (HetNets) that effectively satisfy the demands of mobile phone users. The self-regulation of base station on/off switching in ultra-dense small cell networks (type of HetNets), based on spatial fluctuations of users’ traffic demand, is still a major challenge. In collaboration with engineers, we develop an agent-based model that transfers ideas from the phenotypic regulation of the immune system to self-organization of HetNets. In particular, different immune cell phenotypes correspond to different types of antennas and infected cells correspond to mobile phone users. A set of analogies between mechanisms in the immune system and cellular wireless networks has been already established. Initial simulations provide a successful proof of concept [A23, E1].
Voice production is parted of the superposition two procedures: Phonation and Articulation. The first deals with the vibrations of vocal folds and the output feed the vocal tract [A2]. The different geometries of it, during speech, define the articulations. The acoustical signal is the output of the source signal filtered by the vocal tract. The interactions of source-filter may lead to every possible dynamical phenomenon, like steady states, period doublings, quasi-periodic oscillations and chaotic vibrations. Moreover various illnesses of the vocal system can also let the creation of such phenomena. A classification and a clarification of the underlying mechanisms can create a mapping between phenomena-mechanism, leading to the source of the malfunction. In addition, the opera improvisers are able to perform amazing voice acrobatics-registers.
Last but not least, the above phenomena are appearing often in animal vocalization. The extreme geometries and the creativity of nature in discovering mechanisms offer a lot of material to study. The amazing singings of birds, the strange modulation of the formants (resonant frequencies) of Diana monkey in leopard alarm call, the evolutionary reason of air sacks are open questions. Of particular interest are the implications of vocalization mechanics on the evolutionary dynamics of from animal vocalizations to human voice [A1, A4].