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Wyszukujesz frazę "Nishimura, N." wg kryterium: Autor


Tytuł:
Pseudo-orthogonalization of memory patterns for complex-valued and quaternionic associative memories
Autorzy:
Minemoto, T.
Isokawa, T.
Nishimura, H.
Matsui, N.
Tematy:
Hopfield neural network
pseudo-orthogonalization
complex numbers
quaternions
Pokaż więcej
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Powiązania:
https://bibliotekanauki.pl/articles/91608.pdf  Link otwiera się w nowym oknie
Opis:
Hebbian learning rule is well known as a memory storing scheme for associative memory models. This scheme is simple and fast, however, its performance gets decreased when memory patterns are not orthogonal each other. Pseudo-orthogonalization is a decorrelating method for memory patterns which uses XNOR masking between the memory patterns and randomly generated patterns. By a combination of this method and Hebbian learning rule, storage capacity of associative memory concerning non-orthogonal patterns is improved without high computational cost. The memory patterns can also be retrieved based on a simulated annealing method by using an external stimulus pattern. By utilizing complex numbers and quaternions, we can extend the pseudo-orthogonalization for complex-valued and quaternionic Hopfield neural networks. In this paper, the extended pseudo-orthogonalization methods for associative memories based on complex numbers and quaternions are examined from the viewpoint of correlations in memory patterns. We show that the method has stable recall performance on highly correlated memory patterns compared to the conventional real-valued method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex-valued associative memories with projection and iterative learning rules
Autorzy:
Isokawa, T.
Yamamoto, H.
Nishimura, H.
Yumoto, T.
Kamiura, N.
Matsui, N.
Tematy:
complex-valued neural networks
associative memory
projection
Pokaż więcej
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Powiązania:
https://bibliotekanauki.pl/articles/91682.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we investigate the stability of patterns embedded as the associative memory distributed on the complex-valued Hopfield neural network, in which the neuron states are encoded by the phase values on a unit circle of complex plane. As learning schemes for embedding patterns onto the network, projection rule and iterative learning rule are formally expanded to the complex-valued case. The retrieval of patterns embedded by iterative learning rule is demonstrated and the stability for embedded patterns is quantitatively investigated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique
Grupowanie wakancji substancji rozpuszczonej w stopach Al-Mg-Si analizowanych metodą relaksacji spinowej mionów
Autorzy:
Nishimura, K.
Matsuda, K.
Komaki, R.
Nunomra, N.
Wenner, S.
Holmestad, R.
Matsuzaki, T.
Watanabe, I.
Pratt, F. L.
Tematy:
Al-Mg-Si alloys
muon spin relaxation
vacancy
stopy Al-Mg-Si
relaksacja spinowa mionów
wakancja
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/352369.pdf  Link otwiera się w nowym oknie
Opis:
Zero-field muon spin relaxation experiments were carried out with Al-1.6%Mg2Si, Al-0.5%Mg, and Al-0.5%Si alloys. Observed relaxation spectra were compared with the calculated relaxation functions based on the Monte Carlo simulation to extract the dipolar width (Δ), trapping (νt), and detrapping rates (νd), with the initially trapped muon fraction (P0). The fitting analysis has elucidated that the muon trapping rates depended on the heat treatment and solute concentrations. The dissolved Mg in Al dominated the νt at lower temperatures below 120 K, therefore the similar temperature variations of νt were observed with the samples mixed with Mg. The νt around 200 K remarkably reflected the heat treatment effect on the samples, and the largest νt value was found with the sample annealed at 100°C among Al-1.6%Mg2Si alloys. The as-quenched Al-0.5%Si sample showed significant νt values between 80 and 280 K relating with Si-vacancy clusters, but such clusters disappeared with the natural aged Al-0.5%Si sample.
Stopy Al-1,6%Mg2Si, Al-0,5%Mg i Al-0,5%S poddano badaniu relaksacji spinowej mionów w zerowym polu magnetycznym. Obserwowane widma relaksacyjne porównano z funkcjami relaksacji obliczonymi przy wykorzystaniu symulacji Monte Carlo w celu otrzymania informacji o szerokości dipolarnej Δ (ang. dipolar width) oraz szybkości uwięzienia νt (ang. trapping) i uwolnienia νd (ang. detrapping) z pierwotnie związaną frakcją mionów (P0). Z przeprowadzonej analizy wynika, że szybkość uwięzienia mionów zależy od zastosowanej uprzednio obróbki cieplnej oraz stężenia pierwiastków domieszki. W przypadku Mg rozpuszczonego w osnowie Al dominowała szybkość νt w temperaturach poniżej 120 K, dlatego też w próbkach domieszkowanych Mg obserwowano podobne odchylenia temperaturowe szybkości νt. Szybkość νt w temperaturze około 200 K doskonale ukazuje wpływ zastosowanej obróbki cieplnej na omawiane próbki, z których najwyższą wartość νt wykazały te wyżarzane w 100°C spośród stopów Al-1,6%Mg2Si. Próbka Al-0,5%Si wykazała znaczące wartości νt pomiędzy temperaturami 80 a 280 K wskazujące na aglomeracje wakancji Si, które jednak zanikają po naturalnym starzeniu stopu Al-0.5%Si.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u
Autorzy:
Łukasik, J.
Lynch, W.G.
Sochocka, Anna
Isobe, T.
Brzychczyk, Janusz
Boretzky, K.
Baba, H.
Ikeno, N.
Chiga, N.
Simon, H.
Kim, Y.J.
Fukuda, N.
Atar, L.
Ieki, K.
Lasko, Paweł
Sumikama, T.
Suzuki, D.
Kurata-Nishimura, M.
Nakamura, T.
Nishimura, S.
Jhang, G.
Lee, J.W.
Törnqvist, H.
Kondo, Y.
Lee, H.S.
Otsu, H.
Santamaria, C.
Snoch, A.
Sakurai, H.
Shimizu, Y.
Cerizza, G.
Horvat, A.
Ahn, D.S.
Gasparic, I.
Nakatsuka, N.
Inabe, N.
Kobayashi, T.
Morfouace, P.
Pawłowski, P.
Pelczar, Krzysztof
Sato, H.
Rossi, D.
Togano, Y.
Tangwancharoen, S.
Aumann, T.
Leifels, Y.
Barney, J.
Takeda, H.
Murakami, T.
Yennello, S.J.
Estee, J.
Shane, R.
Kaneko, M.
Wang, R.
Hong, B.
Xiao, Z.G.
Scheit, H.
Tsang, C.Y.
Ono, A.
Manfredi, J.
Tsang, M.B.
McIntosh, A.B.
Zhang, Y.
Suzuki, H.
Opis:
Radioactive tin beams were used to explore the flow observables under varying isospin asymmetries while maintaining a constant total charge. The rapidity dependence of directed flow (v$_{1}$) and elliptic flow (v$_{2}$) was studied for protons, deuterons, tritons, $^{3}$He, and $^{4}$He, produced in neutron-rich $^{132}$Sn + $^{124}$Sn and neutron-deficient $^{108}$Sn + $^{112}$Sn collisions at 270 MeV / nucleon. In general, heavier particles exhibited larger v$_{1}$ and v$_{2}$ values. The experimental data was used to test transport models which simulate heavy ion collisions. Specifically, comparisons were made with Antisymmetrized Molecular Dynamics (AMD) model calculations, which explicitly account for cluster correlations. Two types of momentum-dependent mean field potentials were tested. The results reveal that both v$_{1}$ and v$_{2}$ values are enhanced when the mean field incorporates stronger momentum dependence. In addition, v$_{2}$ exhibits larger sensitivity to symmetry energy than v$_{1}$ but the overall sensitivity to symmetry energy is low. In an attempt to describe the data, different parameter sets have been tried. Most describe either the hydrogen flow or helium flow reasonably well but none describes the flow of all particles simultaneously.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon
Autorzy:
Inabe, N.
Leifels, Y.
Shimizu, Y.
Chiga, N.
Törnqvist, H.
Lasko, P.
Horvat, A.
Kobayashi, T.
Gašparić, I.
Suzuki, H.
Pawłowski, P.
Sakurai, H.
Sato, H.
Xiao, Z.
Kurata-Nishimura, M.
Kaneko, M.
Santamaria, C.
Ono, A.
Scheit, H.
Isobe, T.
Manfredi, J.
Cerizza, G.
Estee, J.
Barney, J.
Yurkon, J.
Ichihara, T.
Lee, H. S.
Boretzky, K.
Ahn, D. S.
Morfouace, P.
Olsen, R.
Kondo, Y.
Atar, L.
Lee, J. W.
Lynch, W. G.
Nishimura, S.
Tangwancharoen, S.
Simon, H.
Nakamura, T.
Suzuki, D.
Sumikama, T.
Togano, Y.
Wang, R.
Rossi, D.
Yennello, S. J.
Otsu, H.
Kim, Y. J.
Ieki, K.
Zhang, Y.
Ikeno, N.
Takeda, H.
Pelczar, K.
McIntosh, A. B.
Tsang, C. Y.
Aumann, T.
Baba, H.
Brzychczyk, Janusz
Hong, B.
Murakami, T.
Łukasik, J.
Shane, R.
Tsang, M. B.
Nakatsuka, N.
Fukuda, N.
Jhang, G.
Opis:
The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich 132Sn+124Sn and neutron-deficient 108Sn+112Sn systems at 270 MeV/nucleon were investigated at RIKEN-RIBF. The data are compared with antisymmetrized molecular dynamics (AMD) calculations and the rapidity distributions can be reproduced after adjusting the in-medium nucleon-nucleon cross sections. The double ratios between the two reaction systems taken for the relative yields of deuteron to proton (d/p) and triton to proton (t/p) are further examined in the midrapidity domain, where the adjustments in the AMD calculations do not affect much on them. The d/p and t/p double ratios at midrapidity agree well with the ratio of the system neutron numbers and its squared value, respectively, and the rapidity dependence of these double ratios is consistent with a picture of partial mixing of colliding nuclei. By comparing with the AMD model which shows a strong symmetry energy dependence of the t/p double ratio, the experimental result in the midrapidity domain favors the calculation with a symmetry-energy slope parameter around L=46 MeV rather than L=108 MeV.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Constraining nucleon effective masses with flow and stopping observables from the S$\pi$RIT experiment
Autorzy:
Inabe, N.
Leifels, Y.
Shimizu, Y.
Zhang, Y. X.
Chiga, N.
Törnqvist, H.
Lasko, P.
Horvat, A.
Kobayashi, T.
Suzuki, H.
Pawłowski, P.
Sakurai, H.
Sato, H.
Kurata-Nishimura, M.
Kaneko, M.
Santamaria, C.
Scheit, H.
Isobe, T.
Manfredi, J.
Estee, J.
Cerizza, G.
Barney, J.
Pelczar, Krzysztof
Lee, H. S.
Boretzky, K.
Ahn, D. S.
Morfouace, P.
Gasparic, I.
Kondo, Y.
Atar, L.
Lee, J. W.
Lynch, W. G.
Nishimura, S.
Tangwancharoen, S.
Simon, H.
Nakamura, T.
Snoch, A.
Suzuki, D.
Sumikama, T.
Togano, Y.
Wang, R.
Rossi, D.
Yennello, S. J.
Otsu, H.
Kim, Y. J.
Ieki, K.
Zhang, Y.
Takeda, H.
McIntosh, A. B.
Tsang, C. Y.
Aumann, T.
Baba, H.
Brzychczyk, Janusz
Hong, B.
Murakami, T.
Łukasik, J.
Sochocka, Anna
Shane, R.
Xiao, Z. G.
Tsang, M. B.
Nakatsuka, N.
Fukuda, N.
Jhang, G.
Opis:
Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v$_{1}$), elliptic flow (v$_{2}$) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at 270 AMeV with the S$\pi$RIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S$_{0}$, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, m$^{*}_{s}$/m$_{N}$, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, m$^{*}_{v}$/m$_{N}$ and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for m$^{*}_{s}$/m$_{N}$, m$^{*}_{v}$/m$_{N}$ and η.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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