747 research outputs found
Experiments in binaural audio for telepresence
One area of telepresence research that has had less, though increasing, analysis is that pertaining to the audio aspects of presence, particularly with regard to the remote detection of real world sounds. If telepresence can be considered as the physical sensation of being elsewhere, whether within a virtual, or real environment then addressing the sensation that provides audio information, whether virtual or real should be a worthwhile endeavour in order to enhance the sense of presence
A Higgs Test of Horizontal Symmetry
Identical interactions found in the three families of quarks and leptons
suggest the presence of a horizontal symmetry. We discuss how such a symmetry
can be tested by measuring the decay rates of Higgs into fermion pairs, and the
Higgs production cross section. Depending on the details, there is a chance
that the decay widths to the bottom-pair and the tau-pair may be down by more
than a factor of 3 or more compared to the usual values, and the fusion
production cross section of the Higgs also altered. Whatever the outcome, such
a test also serves to constraint horizontal symmetry models.Comment: version to be published in Physics Letter
A mechatronic approach to supernormal auditory localisation
Remote audio perception is a fundamental requirement for telepresence and teleoperation in applications that range from work in hostile environments to security and entertainment. The following paper presents the use of a mechatronic system to test the efficacy of audio for telepresence. It describes work to determine whether the use of supernormal inter-aural distance is a valid means of approaching an enhanced method of hearing for telepresence. The particular audio variable investigated is the azimuth angle of error and the construction of a dedicated mechatronic test rig is reported and the results obtained. The paper concludes by observing that the combination of the mechatronic system and supernormal audition does enhance the ability to localise sound sources and that further work in this area is justified
Magic Neutrino Mass Matrix and the Bjorken-Harrison-Scott Parameterization
Observed neutrino mixing can be described by a tribimaximal MNS matrix. The
resulting neutrino mass matrix in the basis of a diagonal charged lepton mass
matrix is both 2-3 symmetric and magic. By a magic matrix, I mean one whose row
sums and column sums are all identical. I study what happens if 2-3 symmetry is
broken but the magic symmetry is kept intact. In that case, the mixing matrix
is parameterized by a single complex parameter , in a form discussed
recently by Bjorken, Harrison, and Scott.Comment: Two references added. To appear in Physics Letters
Marine Ecosystem Enclosed Experiments : proceedings of a symposium held in Beijing, People's Republic of China, 9-14 May 1987
Abstracts in French and Spanis
The SMILING project : prevention of falls by a mechatronic training device
Ageing is characterized by functional changes that can create gait and balance disturbances, which are the main risk factors of falling. Elderly people at risk of falling can be considered to be suffering from an involuntary motor behaviour that restricts their participation in society. One method to overcome such a situation is to activate a new learning process to train for real life tasks, which represents innovation. The SMILING system is intended to challenge the elderly to solve new problems in real time by inducing variable environments that need active response and problem solving. Variable environments induced by perturbations will weaken stiff motor behaviour(s), induce flexibility and thus enable effective training and improve mobility in real life environments. The SMILING solution provides a changeable yet safe environment that needs active response and problem solving by the user. It consists of a wearable non-invasive computer-controlled system that applies chaotic perturbations to the lower extremities during walking through small alterations of the height and slope of weight-bearing surfaces. The complete system consists of 3 modules: i) a complete walking analysis system; ii) a pair of motorised training shoes; iii) a user friendly portable control unit
Tri-Bimaximal Mixing from Twisted Friedberg-Lee Symmetry
We investigate the Friedberg-Lee (FL) symmetry and its promotion to include
the symmetry, and call that the twisted FL symmetry.Based on the
twisted FL symmetry, two possible schemes are presented toward the realistic
neutrino mass spectrum and the tri-bimaximal mixing.In the first scheme, we
suggest the semi-uniform translation of the FL symmetry.The second one is based
on the permutation family symmetry.The breaking terms, which are twisted
FL symmetric, are introduced.Some viable models in each scheme are also
presented.Comment: 14 pages, no figure. v2: 16 pages, modified some sentences, appendix
added, references added. v3: 14 pages, composition simplified, accepted
version in EPJ
S_3 Symmetry and Neutrino Masses and Mixings
Based on a universal seesaw mass matrix model with three scalars \phi_i, and
by assuming an S_3 flavor symmetry for the Yukawa interactions, the lepton
masses and mixings are investigated systematically. In order to understand the
observed neutrino mixing, the charged leptons (e, \mu, \tau) are regarded as
the 3 elements (e_1, e_2, e_3) of S_3, while the neutrino mass-eigenstates are
regarded as the irreducible representation (\nu_\eta, \nu_\sigma, \nu_\pi) of
S_3, where (\nu_\pi, \nu_\eta) and \nu_\sigma are a doublet and a singlet,
respectively, which are composed of the 3 elements (\nu_1, \nu_2, \nu_3) of
S_3.Comment: 16 pages, no figure, version to appear in EPJ-
On the generalized linear equivalence of functions over finite fields
In this paper we introduce the concept of generalized linear equivalence between functions defined over finite fields; this can be seen as an extension of the classical criterion of linear equivalence, and it is obtained by means of a particular geometric representation of the functions. After giving the basic definitions, we prove that the known equivalence relations can be seen as particular cases of the proposed generalized relationship and that there exist functions that are generally linearly equivalent but are not such in the classical theory. We also prove that the distributions of values in the Difference Distribution Table (DDT) and in the Linear Approximation Table (LAT) are invariants of the new transformation; this gives us the possibility to find some Almost Perfect Nonlinear (APN) functions that are not linearly equivalent (in the classical sense) to power functions, and to treat them accordingly to the new formulation of the equivalence criterion
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