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29 results on '"Hamada, Shinji"'

13. Real Time Visualization of Quantum Walk.

Author

Miyazaki, Akihide, Hamada, Shinji, and Sekino, Hideo

Subjects
*TIME-dependent Schrodinger equations, *ELECTRON diffusion, *RANDOM walks, *MATHEMATICAL models, *QUANTUM theory, *PARTICLES, *SCIENTIFIC visualization, *DEGREES of freedom, *COMPUTATIONAL physics
Abstract

Time evolution of quantum particles like electrons is described by time-dependent Schrödinger equation (TDSE). The TDSE is regarded as the diffusion equation of electrons with imaginary diffusion coefficients. And the TDSE is solved by quantum walk (QW) which is regarded as a quantum version of a classical random walk. The diffusion equation is solved in discretized space/time as in the case of classical random walk with additional unitary transformation of internal degree of freedom typical for quantum particles. We call the QW for solution of the TDSE a Schrödinger walk (SW). For observation of one quantum particle evolution under a given potential in atto-second scale, we attempt a successive computation and visualization of the SW. Using Pure Data programming, we observe the correct behavior of a probability distribution under the given potential in real time for observers of atto-second scale. [ABSTRACT FROM AUTHOR]

Published
2014
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22. Lasing at 352 nm of the NIJI-IV Storage-Ring Free-Electron Laser

Author

Yamazaki, Tetsuo, primary, Yamada, Kawakatsu, additional, Sei, Norihiro, additional, Ohgaki, Hideaki, additional, Kawai, Masayuki, additional, Yokoyama, Minoru, additional, Hamada, Shinji, additional, Sugiyama, Suguru, additional, Mikado, Tomohisa, additional, Suzuki, Ryoichi, additional, Noguchi, Tsutomu, additional, and Iwata, Mitsukuni Chiwaki, additional

Published
1994
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23. Study of Free Electron Laser(FEL) using the Electron Storage Ring "NIJI-IV".

Author

KAWAI, Masayuki, primary, YOKOYAMA, Minoru, additional, HAMADA, Shinji, additional, YAMAZAKI, Tetsuo, additional, YAMADA, Kawakatsu, additional, SEI, Norihiro, additional, SUGIYAMA, Suguru, additional, OHGAKI, Hideaki, additional, MIKADO, Tomohisa, additional, CHIWAKI, Mitsukuni, additional, SUZUKI, Ryouichi, additional, NOGUCHI, Tutomu, additional, and TOMIMASU, Takio, additional

Published
1993
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26. Validation Study of QSAR/DNN Models Using the Competition Datasets.

Author

Kato, Yoshiki, Hamada, Shinji, and Goto, Hitoshi

Subjects
BIOCOMPLEXITY, CHEMICAL processes, ARTIFICIAL neural networks
Abstract

Since the QSAR/DNN model showed predominant predictive performance over other conventional methods in the Kaggle QSAR competition, many artificial neural network (ANN) methods have been applied to drug and material discovery. Appearance of artificial intelligence (AI), which is combined various general purpose ANN platforms with large‐scale open access chemical databases, has attracting great interest and expectation in a wide range of molecular sciences. In this study, we investigate various DNN settings in order to reach a high‐level of predictive performance comparable to the champion team of the competition, even with a general purpose ANN platform, and introduce the Meister setting for constructing a good QSAR/DNNs model. Here, we have used the most commonly available DNN model and constructed many QSAR/DNN models trained with various DNN settings by using the 15 datasets employed in the competition. As a result, it was confirmed that we can constructed the QSAR/DNN model that shows the same level of R2 performance as the champion team. The difference from the DNN setting recommended by the champion team was to reduce the mini‐batch size. We have also explained that the R2 performance of each target depends on the molecular activity type, which is related to the complexity of biological mechanisms and chemical processes observed in molecular activity measurements. [ABSTRACT FROM AUTHOR]

Published
2020
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