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Taito-ku, Japan

Tokyo University of the Arts or Geidai is an art school in Japan. Located in Ueno Park, it also has facilities in Toride, Ibaraki, Yokohama, Kanagawa, and Kitasenju, Adachi, Tokyo. The university owns two halls of residence: one in Nerima, Tokyo, and the other in Matsudo, Chiba. Wikipedia.

Hotta M.,Tokyo Institute of Technology | Hayashi M.,Tokyo Institute of Technology | Nagata K.,Tokyo University of the Arts
ISIJ International

The real and imaginary parts of relative permittivity (εr' and εr") and permeability (μr' and μr") of Fe3O4 powder were successfully measured over the temperature range of 25-575°C by means of the coaxial transmission line method in order to elucidate the heating behaviours of Fe3O4 powder. The measurement frequency range is from 0.2 to 13.5 GHz. With respect to the temperature dependencies of the complex permittivity, the εr' values show a peak around 450-500°C. The εr" values monotonically increase with increasing temperature, in particular, showing abrupt increase above ca. 400°C. As for the complex permeability, the μr' values decrease with an increase in temperature, and reach the same level as that of vacuum (μr'=1) at 575°C, i.e., the maximum measurement temperature. The μr" values increase with temperature until 500°C below 3.5 GHz although they monotonically decrease with an increase in temperature above 3.5 GHz. © 2011 ISIJ. Source

Brown S.,McMaster University | Brown S.,Tokyo University of the Arts | Brown S.,Max Planck Institute for Evolutionary Anthropology | Brown S.,China Medical University at Taichung
Proceedings. Biological sciences / The Royal Society

We present, to our knowledge, the first quantitative evidence that music and genes may have coevolved by demonstrating significant correlations between traditional group-level folk songs and mitochondrial DNA variation among nine indigenous populations of Taiwan. These correlations were of comparable magnitude to those between language and genes for the same populations, although music and language were not significantly correlated with one another. An examination of population structure for genetics showed stronger parallels to music than to language. Overall, the results suggest that music might have a sufficient time-depth to retrace ancient population movements and, additionally, that it might be capturing different aspects of population history than language. Music may therefore have the potential to serve as a novel marker of human migrations to complement genes, language and other markers. Source

Kuniba A.,Tokyo University of the Arts | Okado M.,Osaka University
Journal of Physics A: Mathematical and Theoretical

Soibelmans theory of quantized function algebra A q(SL n) provides a representation theoretical scheme to construct a solution of the Zamolodchikov tetrahedron equation. We extend this idea originally due to Kapranov and Voevodsky to A q(Sp 2n) and obtain the intertwiner K corresponding to the quartic Coxeter relation. Together with the previously known three-dimensional (3D) R matrix, the K yields the first ever solution to the 3D analogue of the reflection equation proposed by Isaev and Kulish. It is shown that matrix elements of R and K are polynomials in q and that there are combinatorial and birational counterparts for R and K. The combinatorial ones arise either at q = 0 or by tropicalization of the birational ones. A conjectural description for type B and F 4 cases is also given. © 2012 IOP Publishing Ltd. Source

Kuniba A.,Tokyo University of the Arts | Okado M.,Osaka City University
Communications in Mathematical Physics

The intertwiner of the quantized coordinate ring Aq(sl3) is known to yield a solution to the tetrahedron equation. By evaluating their n-fold composition with special boundary vectors we generate series of solutions to the Yang-Baxter equation. Finding their origin in conventional quantum group theory is a clue to the link between two and three dimensional integrable systems. We identify them with the quantum R matrices associated with the q-oscillator representations of Uq(A(2) 2n), Uq(C(1) n) and Uq(D(2) n+1). © 2014, Springer-Verlag Berlin Heidelberg. Source

Inoue M.,Osaka University | Kaneko K.,Tokyo University of the Arts
PLoS Computational Biology

Cells generally adapt to environmental changes by first exhibiting an immediate response and then gradually returning to their original state to achieve homeostasis. Although simple network motifs consisting of a few genes have been shown to exhibit such adaptive dynamics, they do not reflect the complexity of real cells, where the expression of a large number of genes activates or represses other genes, permitting adaptive behaviors. Here, we investigated the responses of gene regulatory networks containing many genes that have undergone numerical evolution to achieve high fitness due to the adaptive response of only a single target gene; this single target gene responds to changes in external inputs and later returns to basal levels. Despite setting a single target, most genes showed adaptive responses after evolution. Such adaptive dynamics were not due to common motifs within a few genes; even without such motifs, almost all genes showed adaptation, albeit sometimes partial adaptation, in the sense that expression levels did not always return to original levels. The genes split into two groups: genes in the first group exhibited an initial increase in expression and then returned to basal levels, while genes in the second group exhibited the opposite changes in expression. From this model, genes in the first group received positive input from other genes within the first group, but negative input from genes in the second group, and vice versa. Thus, the adaptation dynamics of genes from both groups were consolidated. This cooperative adaptive behavior was commonly observed if the number of genes involved was larger than the order of ten. These results have implications in the collective responses of gene expression networks in microarray measurements of yeast Saccharomyces cerevisiae and the significance to the biological homeostasis of systems with many components. © 2013 Inoue and Kaneko. Source

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