Zobrazeno 1 - 10 of 270 pro vyhledávání: '"Kenji OKAJIMA"'
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Akademický článek
EVALUATION OF THE EFFECT OF TURBID WATER IN CANALS ON UNDERWATER ULTRASONIC ROUGHNESS MEASUREMENTS.
Autor: Nozomu Urahata, Kenji Okajima
Publikováno v: International Journal of GEOMATE; Jun2024, Vol. 26 Issue 118, p1-8, 8p
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2
Development and testing of a surface roughness measurement device based on aerial ultrasonic reflections
Autor: Mohammad Raihanul Islam, Seiya Nagaoka, Ryouei Ito, Ken Watanabe, Kenji Okajima
Publikováno v: Paddy and Water Environment. 18:345-353
Repairs of concrete irrigation channels in Japan are guided to a large extent by the degree to which their walls have degraded over decades of use. Current methods of estimating Manning roughness coefficients from the roughness of the channel wall ar
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6bcef6f83a313c5c8e0cc0e578b0d523
https://doi.org/10.1007/s10333-019-00786-3
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3
The tendency of damage of stone walls in terrace fields in the northwestern Kumamoto City by the 2016 Kumamoto Earthquake and heavy rain in 2016 and 2006
Autor: Kenji Okajima, Shoko Nishiwaki
Publikováno v: Paddy and Water Environment. 17:231-236
The topographical features of farmland stone walls that were damaged by two heavy rains and the 2016 Kumamoto Earthquake were studied. Topographical analyses were performed on data for sites of the damaged farmland stone walls by QGIS. The topographi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d8c42448a147b7e40342b2132c0e5766
https://doi.org/10.1007/s10333-019-00715-4
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4
Development of a measurement method for abrasion irrigation channel using underwater ultrasonic wave
Autor: Mohammad Raihanul Islam, Seiya Nagaoka, Kenji Okajima, Ken Watanabe, Ryoei Ito
Publikováno v: Paddy and Water Environment. 17:549-554
Japan has many concrete irrigation channels with total length of about 400,000 km. Most of these channels are now too old for continued use. It would be too costly to reconstruct these channels. The concrete surfaces of the channels have been abraded
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ec4a1d0d39f0393177855405a27fb7e8
https://doi.org/10.1007/s10333-019-00751-0
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8
EVALUATION OF ATTENUATION OF ULTRASONIC WAVE IN AIR TO MEASURE CONCRETE ROUGHNESS USING AERIAL ULTRASONIC SENSOR
Autor: Islam Mohammad Raihanul, Seiya Nagaoka, Tetsu Ito, Kenji Okajima, Ken Watanabe, Ryoei Ito
Publikováno v: International Journal of GEOMATE. 14
In Japan, the total length of the main concrete agriculture irrigation canals is estimated to beabout 50,000 km. These canals deteriorate over time and most of the canal surface has become rough. Onemethod of measurement of the roughness of the concr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6e25abae7ffe8bf34e1e59fc754949fd
https://doi.org/10.21660/2018.42.7242
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10
Spatiotemporal receptive fields of direction selective cells self-organized by an Infomax-based learning model
Autor: Kenji Okajima
Publikováno v: Neurocomputing. 129:548-555
Spatiotemporal receptive fields of direction selective cells, or cells whose responses are selective to direction of motion of visual stimuli, were investigated theoretically. A learning algorithm for a spatiotemporal receptive field of a model visua
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f448512dd0bb2ea542555a952cccc79d
https://doi.org/10.1016/j.neucom.2013.09.004
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