278 research outputs found
小データを用いた機械学習のための情報の探索と活用
京都大学新制・課程博士博士(情報学)甲第23313号情博第749号新制||情||128(附属図書館)京都大学大学院情報学研究科知能情報学専攻(主査)教授 鹿島 久嗣, 教授 山本 章博, 教授 吉川 正俊学位規則第4条第1項該当Doctor of InformaticsKyoto UniversityDFA
Defect imaging for plate-like structures using diffuse acoustic wave generated by modulated laser
Authors have studied defect imaging technique for plate-like structures, which creates an image beyond diffraction limit and can be applied to a plate-like structure with a complex shape because this technique just uses variations of flexural vibration energy due to the differences in nominal bending stiffness at laser spots. However, this technique generates spurious images caused by the resonance as well as defect images. The current study described how the spurious images can be reduced using diffuse acoustic wave, and then showed that images of defects and adhesive regions can be obtained appropriately even in such complex structures as a flat plate with a complex shape, a curved plate, and a branch pipe.45TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLUME 38, 15–19 July 2018, Vermont, USATakahiro Hayashi and Shogo Nakao, "Defect imaging for plate-like structures using diffuse acoustic wave generated by modulated laser", AIP Conference Proceedings 2102, 050003 (2019) https://doi.org/10.1063/1.509976
Remote defect imaging for plate-like structures based on the scanning laser source technique
In defect imaging with a scanning laser source technique, the use of a fixed receiver realizes stable measurements of flexural waves generated by laser at multiple rastering points. This study discussed the defect imaging by remote measurements using a laser Doppler vibrometer as a receiver. Narrow-band burst waves were generated by modulating laser pulse trains of a fiber laser to enhance signal to noise ratio in frequency domain. Averaging three images obtained at three different frequencies suppressed spurious distributions due to resonance. The experimental system equipped with these newly-devised means enabled us to visualize defects and adhesive objects in plate-like structures such as a plate with complex geometries and a branch pipe.44TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLUME 37, 16–21 July 2017, Provo, Utah, USATakahiro Hayashi, Atsuya Maeda, and Shogo Nakao, "Remote defect imaging for plate-like structures based on the scanning laser source technique", AIP Conference Proceedings 1949, 090006 (2018) https://doi.org/10.1063/1.503156
Case Study on the Relationship Between Learning Group Function and Teacher Behavior in Elementary School Physical Education : Taking the Upper Grades Gymnastics Apparatus Class as an Example
Exact Solutions of Holonomic Quantum Computation
Holonomic quantum computation is analyzed from geometrical viewpoint. We
develop an optimization scheme in which an arbitrary unitary gate is
implemented with a small circle in a complex projective space. Exact solutions
for the Hadamard, CNOT and 2-qubit discrete Fourier transform gates are
explicitly constructed.Comment: 11 pages, re-organized to be more comprehensive, references added,
style file of Physics Letters A is neede
Support for stroke patients in resumption of driving: patient survey and driving simulator trial
Remote defect imaging for plate-like structures based on the scanning laser source technique
In defect imaging with a scanning laser source technique, the use of a fixed receiver realizes stable measurements of flexural waves generated by laser at multiple rastering points. This study discussed the defect imaging by remote measurements using a laser Doppler vibrometer as a receiver. Narrow-band burst waves were generated by modulating laser pulse trains of a fiber laser to enhance signal to noise ratio in frequency domain. Averaging three images obtained at three different frequencies suppressed spurious distributions due to resonance. The experimental system equipped with these newly-devised means enabled us to visualize defects and adhesive objects in plate-like structures such as a plate with complex geometries and a branch pipe
Distribution of Dust around Galaxies: An Analytic Model
We develop an analytic halo model for the distribution of dust around
galaxies. The model results are compared with the observed surface dust density
profile measured through reddening of background quasars in the Sloan Digital
Sky Survey (SDSS) reported by Menard et al.(2010). We assume that the dust
distribution around a galaxy is described by a simple power law, similarly to
the mass distribution, but with a sharp cut-off at where
is the galaxy's virial radius and is a model parameter.
Our model reproduces the observed dust distribution profile very well over a
wide range of radial distance of kpc. For the
characteristic galaxy halo mass of estimated
for the SDSS galaxies, the best fit model is obtained if is greater
than unity, which suggests that dust is distributed to over a few hundred
kilo-parsecs from the galaxies. The observed large-scale dust distribution
profile is reproduced if we assume the total amount of dust is equal to that
estimated from the integrated stellar evolution over the cosmic time.Comment: 5 pages, 4 figures, corrected typo and minor revisions, results
unchanged, MNRAS Letters, in pres
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