Usual environmental representations either tend to complexify the world or to restrain a robot’s movements in order to locate it correctly. Overly localised perceptions are often to blame. They focus on details such as distance to a wall. For large scale navigation, this type of information is not relevant. This article introduces a concise representation system which allows a behaviour indepen...

Atomic magnetometers have very high absolute precision and sensitivity to magnetic fields but suffer from a fundamental problem: the vectorial or tensorial interaction of light with atoms leads to "dead zones," certain orientations of the magnetic field where the magnetometer loses its sensitivity. We demonstrate a simple polarization modulation scheme that simultaneously creates coherent popul...

Facebook and other Social Network Sites are often seen by educators as multifunctional platforms that can be used for teaching, learning and/or the facilitation of both. One such strand is making use of them as tools/platforms for using and learning through argumentation and discussion. Research on whether this ‘promise’ is actually achieved – also the research reported on in this Special Issue...

50 Recd 21.12.03; Accptd 19.01.04; Online 51 Critics of sexual conflict theory argue that females 52 may gain a net reproductive benefit to mating with 53 manipulative males because the direct costs that 54 they suffer may be offset by the production of sexy, 55 i.e. manipulative, sons. However, this exclusive 56 focus on nuclear gene effects represents an incom57 plete view of female f itness....

[This corrects the article on p. 1054 in vol. 8, PMID: 28649238.].

Diversity is deemed a crucial concept in the field of multiple classifier systems, although no exact definition has been found so far. Existing diversity measures exhibit some issues, both from the theoretical viewpoint, and from the practical viewpoint of ensemble construction. We propose to address some of these issues through the derivation of decompositions of classification error, analogue...

Glioblastoma Multiforme (GBM) is one of the most aggressive and malignant cancers of the central nervous system (CNS). GBM tumors are derived from glial cells, the most common cell type in the CNS. Glial cells and neuronal cells, the other category of CNS cells, work in concert to produce a functional nervous system. Neuronal cells work to transmit signals to and from the brain, while glial cel...

Thompson’s group F was introduced by Richard Thompson in the 1960’s and has since found applications in many areas of mathematics including algebra, logic and topology. We focus on the dead end depth of F , which is the minimal integer N such that for any group element, g, there is guaranteed to exist a path of length at most N in the Cayley graph of F leading from g to a point farther from the...