56 research outputs found
Modification of a neuronal network direction using stepwise photo-thermal etching of an agarose architecture
Control over spatial distribution of individual neurons and the pattern of neural network provides an important tool for studying information processing pathways during neural network formation. Moreover, the knowledge of the direction of synaptic connections between cells in each neural network can provide detailed information on the relationship between the forward and feedback signaling. We have developed a method for topographical control of the direction of synaptic connections within a living neuronal network using a new type of individual-cell-based on-chip cell-cultivation system with an agarose microchamber array (AMCA). The advantages of this system include the possibility to control positions and number of cultured cells as well as flexible control of the direction of elongation of axons through stepwise melting of narrow grooves. Such micrometer-order microchannels are obtained by photo-thermal etching of agarose where a portion of the gel is melted with a 1064-nm infrared laser beam. Using this system, we created neural network from individual Rat hippocampal cells. We were able to control elongation of individual axons during cultivation (from cells contained within the AMCA) by non-destructive stepwise photo-thermal etching. We have demonstrated the potential of our on-chip AMCA cell cultivation system for the controlled development of individual cell-based neural networks
Crystalizing the Spinon Basis
The quasi-particle structure of the higher spin XXZ model is studied. We
obtained a new description of crystals associated with the level integrable
highest weight modules in terms of the creation operators
at (the crystaline spinon basis). The fermionic character formulas and
the Yangian structure of those integrable modules naturally follow from this
description. We have also derived the conjectural formulas for the multi
quasi-particle states at .Comment: 25 pages, late
Emotional Communication in Finger Braille
We describe analyses of the features of emotions (neutral, joy, sadness, and anger) expressed by Finger Braille interpreters and subsequently examine the effectiveness of emotional expression and emotional communication between people unskilled in Finger Braille. The goal is to develop a Finger Braille system to teach emotional expression and a system to recognize emotion. The results indicate the following features of emotional expression by interpreters. The durations of the code of joy were significantly shorter than the durations of the other emotions, the durations of the code of sadness were significantly longer, and the finger loads of anger were significantly larger. The features of emotional expression by unskilled subjects were very similar to those of the interpreters, and the coincidence ratio of emotional communication was 75.1%. Therefore, it was confirmed that people unskilled in Finger Braille can express and communicate emotions using this communication medium
Tau functions in combinatorial Bethe ansatz
We introduce ultradiscrete tau functions associated with rigged
configurations for A^{(1)}_n. They satisfy an ultradiscrete version of the
Hirota bilinear equation and play a role analogous to a corner transfer matrix
for the box-ball system. As an application, we establish a piecewise linear
formula for the Kerov-Kirillov-Reshetikhin bijection in the combinatorial Bethe
ansatz. They also lead to general N-soliton solutions of the box-ball system.Comment: 52 page
Five-dimensional AGT Conjecture and the Deformed Virasoro Algebra
We study an analog of the AGT relation in five dimensions. We conjecture that
the instanton partition function of 5D N=1 pure SU(2) gauge theory coincides
with the inner product of the Gaiotto-like state in the deformed Virasoro
algebra. In four dimensional case, a relation between the Gaiotto construction
and the theory of Braverman and Etingof is also discussed.Comment: 12 pages, reference added, minor corrections (typos, notation
changes, etc
Character Formulae of -Modules and Inhomogeneous Paths
Let B_{(l)} be the perfect crystal for the l-symmetric tensor representation
of the quantum affine algebra U'_q(\hat{sl(n)}). For a partition mu =
(mu_1,...,mu_m), elements of the tensor product B_{(mu_1)} \otimes ... \otimes
B_{(mu_m)} can be regarded as inhomogeneous paths. We establish a bijection
between a certain large mu limit of this crystal and the crystal of an
(generally reducible) integrable U_q(\hat{sl(n)})-module, which forms a large
family depending on the inhomogeneity of mu kept in the limit. For the
associated one dimensional sums, relations with the Kostka-Foulkes polynomials
are clarified, and new fermionic formulae are presented. By combining their
limits with the bijection, we prove or conjecture several formulae for the
string functions, branching functions, coset branching functions and spinon
character formula of both vertex and RSOS types.Comment: 42 pages, LaTeX2.0
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