Ken Watanabe

Forestry and Forest Products Research Institute

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Tomoko Akutsu

National Research Institute of Police Science

Koichi Sakurada

Tokyo Medical and Dental University

Erimitsu Suzuki

Systems Technology (United States)

Junichiro Niwa

Tokyo Institute of Technology

Masao NAGAI

Tokyo University of Agriculture and Technology

Mamoru Fujii

Tokai University

Kochi Toyomane

National Research Institute of Police Science

Hideaki Korai

Forestry and Forest Products Research Institute

Hiroshi Yoshioka

University of California, Irvine

Takayuki Tohtake

Railway Technical Research Institute

Cooperative Institutions

European Organization for Nuclear Research

268

Fermi National Accelerator Laboratory

185

Centre National de la Recherche Scientifique

181

A. Alikhanyan National Laboratory

179

SLAC National Accelerator Laboratory

178

High Energy Accelerator Research Organization

161

Institut National de Physique Nucléaire et de Physique des Particules

149

Deutsches Elektronen-Synchrotron DESY

146

The University of Tokyo

140

Stanford University

133

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Prediction Method for the Initiation of the Spalling of the Cover Concrete of RC Bridges in Service

Sustainable construction materials and technologies (2016)

Shuntaro Todoroki Ken Watanabe

The objective of this study is to predict the initiation of the spalling of the cover concrete of RC bridges by estimating the rebar corrosion rate.The rebar corrosion rate was studied based on the developed estimation method by means of the visual observation of such phenomena as the spalling of the cover concrete of the columns and barriers of railway RC bridges in service.The result indicated that the rebar corrosion rate in wet condition was 2.2 times faster than that in dry condition, and the effect of dry-wet condition to the rebar corrosion rate was larger than that of cover depth and uncarbonated depth.In addition, based on the existing equation of the rebar corrosion rate in consideration of the dry-wet condition of concrete, the corrosion rate of these RC bridges in service was estimated on the assumption that the water content is 5% at the concrete surface in case of wet condition which is recognized by the existence of the water-bearing mark, and on the assumption that the water content is 2-4% at the concrete surface in case of dry or dry-wet condition.By means of the proposed method which is based on the estimation of the rebar corrosion rate, it is possible to predict the initiation of the spalling of the cover concrete of RC bridges in service.

Spall

Concrete cover

10.18552/2016/scmt4m107

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Citations (0)

Precise and comprehensive determination of multiple body fluids by applying statistical cutoff values to a multiplex reverse transcription-PCR and capillary electrophoresis procedure for forensic purposes

Legal Medicine (2022)

Tomoko Akutsu Isao Yokota Ken Watanabe Kochi Toyomane Takayuki Yamagishi

Body fluid

Amplicon

Multiplex

Forensic identification

Identification

10.1016/j.legalmed.2022.102087

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Citations (4)

Development of a DNA methylation-based semen-specific SNP typing method: A new approach for genotyping from a mixture of body fluids

Forensic Science International Genetics (2018)

Ken Watanabe Kei Taniguchi Tomoko Akutsu

Pyrosequencing

CpG site

SNP genotyping

Body fluid

10.1016/j.fsigen.2018.09.004

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Citations (20)

LOCALIZED FRACTURE LENGTH AND FRACTURE ENERGY OF CONCRETE IN COMPRESSION

Transactions of the Japan Concrete Institute (2001)

Torsak Lertsrisakulrat Ken Watanabe Maki MATSUO Junichiro Niwa

Source

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Citations (3)

Predicting oven-dry density of Sugi (Cryptomeria japonica) using near infrared (NIR) spectroscopy and its effect on performance of wood moisture meter

Journal of Wood Science (2012)

Ken Watanabe Isao Kobayashi Naohiro Kuroda Masaki Harada Shuichi Noshiro

Cryptomeria

10.1007/s10086-012-1268-4

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Citations (14)

DNAメチル化率を指標としたBekaertおよびGaraliの年齢推定法の日本人血液および陳旧血痕試料における検証

Japanese Journal of Forensic Science and Technology (2023)

Takayuki Yamagishi Yuya Hamano Ken Watanabe Chie Morimoto Kochi Toyomane

Age estimation based on the methylation rates of DNA in blood samples can provide useful information for narrowing down candidates of unidentified donors and might be helpful in supporting criminal investigations. In our previous study, we showed that Bekaert's age-prediction model using pyrosequencing can estimate the age of Japanese blood samples with high accuracy. Recently, Garali et al. reported a new age-prediction model that requires a smaller amount of DNA compared to Bekaert's model, using the same platform. In the present study, we validated whether Garali's age-prediction model can be applied to Japanese blood samples. In addition, we verified whether these prediction models can be applied to aged bloodstain samples, which are common in criminal investigations. The accuracy of Garali's model on Japanese blood samples (n=143) was 3.19 years in terms of absolute mean error (MAE) and 4.24 in terms of root mean square error (RMSE), which were comparable to those of Bekaert's model (MAE 3.24 and RMSE 4.12). Although Garali's model alone could predict age with high accuracy, it was suggested that using both models for age prediction is preferrable when DNA yields are sufficient because Bekaert's model could probabilistically reduce prediction error due to marker multiplicity. At nearly all CpG sites examined, no significant differences were observed in methylation rates between aged bloodstain samples (stored for 1 week to 14 years) and blood controls. Similarly, differences in predicted ages between Japanese blood and aged bloodstain samples were very small in both models. These results suggest that both age-prediction models can be applied to aged bloodstain samples with the same high accuracy as when applied to fresh blood, even when samples have been stored for a long period of time.

Mean absolute error

Pyrosequencing

10.3408/jafst.867

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Citations (0)

Detection of Partial Discharges Occurring in Propulsion Coils of Superconducting Maglev Systems from a Test Bogie Running at High Speed Using a Radio Interferometer System with a Vector-Antenna

Masatake Kawada Ryohei Ikeda Masayuki Aiba Ken Watanabe Masao Suzuki

A large number of ground coils are used in superconducting magnetic levitation (Maglev) systems; therefore, it has been considered that condition monitoring systems for the ground coils are mounted on Maglev trains. We have been studying radio sensing techniques to detect partial discharges (PD) occurring in propulsion coils. In this study, a radio interferometer system with a vector-antenna was mounted on a test bogie, which can be run at the speed of 200 km/h by remote control. The vector-antenna composed of vertical and horizontal dipole-antennas was set to the center of the antenna-array of the radio interferometer system. A set of mock-ups of the propulsion coil and the levitation-guidance coil was set on the side of the test track of which length is 500 m. The propulsion coil has multiple holes penetrating through insulation to the inner conductor for attaching a needle-electrode; one or some of the holes can be voluntarily chosen to generate PDs. Experimental results showed that the propulsion coil with a PD source set behind the levitation-guidance coil could be located from the test bogie running at the speeds of 198.5 km/h and 212.3 km/h.

Maglev

Bogie

Magnetic Levitation

Voice coil

10.1109/eic47619.2020.9158671

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Citations (5)

<b>Outline of Design Standard and Commentary for Railway Structures (Concrete Structures)</b>

Quarterly Report of RTRI (2024)

Ken Watanabe Toshiya Tadokoro Manabu IKEDA Masaru OKAMOTO

10.2219/rtriqr.65.3_195

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