Dr. Naoko Miura Profile

Dr. Naoko Miura

at The University of Tokyo

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Publications (2)

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Proceedings Article | 21 October 2014 Paper

Acquisition of underwater topography in a mountain channel using terrestrial laser scanning

N. Miura, Y. Asano

Proceedings Volume 9239, 92391D (2014) https://doi.org/10.1117/12.2067143

KEYWORDS: Data acquisition, Scanners, Water, Clouds, Laser scanners, Distance measurement, Refraction, Data modeling, Agriculture, Hydrology

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For better risk management, detailed and quantitative measurement of channel and stream-bed structure is required to assimilate and forecast how the water and sediment flow in mountain channels. Our previous research demonstrated good performance of green-wavelength TLS for measurement of submerged stream-bed in a steep mountain channel. The results also showed that each of water depth and flow velocity alone does not affect the accuracy of TLS measurement. Instead, it was indicated that the specification of data acquisition may have an impact on the accuracy of derived Digital Terrain Models (DTMs). Therefore, this paper examines how the acquisition protocol of TLS affects the accuracy of data collected in the mountain channel. First, it is tested whether different scanner height, that is, incident angle affects the data acquisition in terms of point density and accuracy. Then, the difference in minimum point spacing is examined to find how much impact it has on derived DTM. It is also analyzed whether a combination of multiple TLS data acquired from different direction improves data accuracy, compared to the data acquired by single measurement. All the acquired underwater data by TLS are water refraction corrected and validated using field surveyed data. The results of these tests showed that the accuracy of derived DTM was improved when the scanner height was raised or data was acquired from multiple directions, however, acquiring denser point cloud with minimum point spacing of 1 mm did not improve the accuracy of the data.

Proceedings Article | 14 December 1992 Paper

Infrared and far-infrared magneto-spectroscopy of semiconductors in high magnetic fields in the megagauss range

N. Miura

Proceedings Volume 1929, 192932 (1992) https://doi.org/10.1117/12.2298227

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The recent progress of pulsed high magnetic field technology has made possible the IR and FIR spectroscopy under very high magnetic fields in the megagauss range (<100T), which opens up various new possibilities. In this paper, we present the latest results of the IR and FIR magneto- spectroscopy of semiconductors in the megagauss range, in particular, spectroscopy of novel interesting materials with low mobilities such as p-diamond, SiC, and AlAs, cyclotron resonance in a band with a camel's back structure, and prominent polaron effects in II-VI compounds.

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