Most theories of navigation rely on the concept of a mental map and compass. Hippocampal place cells are neurons thought to be important for representing the mental map; these neurons become active when the animal traverses a specific location in the environment (the "place field"). Head-direction cells are found outside the hippocampus, and encode the animal's head orientation, thus implementi...

There are many DOA estimation methods based on different signal features, and these often evaluated by experimental results, but lack the necessary theoretical basis. Therefore, a direction of arrival (DOA) system self-organizing map (SOM) designed for arbitrarily distributed sensor array is proposed. The essential principle this method that from distance difference (DDOA) to Lipschitz continui...

In this paper we address the problem of overcomplete BSS for convolutive mixtures following a two-step approach. In the first step the mixing matrix is estimated, which is then used to separate the signals in the second step. For estimating the mixing matrix we propose an algorithm based on hierarchical clustering, assuming that the source signals are sufficiently sparse. It has the advantage o...

IntroductIon During group meetings it is often difficult for participants to effectively: share their knowledge to inform the outcome; acquire new knowledge from others to broaden and/or deepen their understanding; utilise all available knowledge to design an outcome; and record (to retain) the rationale behind the outcome to inform future activities. These are difficult because, for example: o...

We report here that the direction of aligned cells on nanopatterns can be tuned to a perpendicular direction without use of any biochemical reagents. This was enabled by shape-memory activation of nanopatterns that transition from a memorized temporal pattern to the original permanent pattern by heating. The thermally induced shape-memory nanopatterns were prepared by chemically crosslinking se...