Updated on 2024/02/20

写真a

 
SHUKU Takayuki
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • 博士(環境学) ( 2011.9   岡山大学 )

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering  / data analysis, machine learning

Education

  • Okayama University   大学院環境生命科学研究科  

    2008.10 - 2011.9

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    Country: Japan

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  • Shimane University   Interdisciplinary Graduate School of Science and Engineering   A

    2005.4 - 2007.3

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    Country: Japan

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  • Shimane University   Interdisciplinary Faculty of Science and Engineering   Department of Geoscience

    2001.4 - 2005.3

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    Country: Japan

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Research History

  • Okayama University   Faculty of Engineering   Associate Professor

    2021.4

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    Country:Japan

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  • National University of Singapore   Department of civil and environmental engineering   Visiting scholar

    2019.12 - 2020.10

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    Country:Singapore

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  • Okayama University   Faculty of Environmental Science and Technology Department of Environmental Management Engineering   Associate Professor

    2016.10 - 2020.3

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    Country:Japan

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  • Okayama University   Faculty of Environmental Science and Technology Department of Environmental Management Engineering   Assistant Professor

    2011.10 - 2016.9

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    Country:Japan

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  • Ohmoto Gumi Co., Ltd.   Faculty of Civil Engineering, department of design   Engineer

    2007.4 - 2011.9

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    Country:Japan

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Papers

  • RBSMによる塑性圧が作用する農業用水路トンネルの模型実験の解析 Reviewed

    田本敏之, 柴田俊文, 西村伸一, 珠玖隆行

    農業農村工学会論文集   91 ( 2 )   I-239 - I-247   2023.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.11408/jsidre.91.I_239

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  • Effect of Permeability Random Field on Piping Risk of a River Dike3 Reviewed

    Shin-ichi NISHIMURA, Go KUBOTA, Ryota OHASHI, Toshifumi SHIBATA, Takayuki SHUKU

    Geotechnical Special Publication (GSP), ASCE   347   2023.7

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    Publishing type:Research paper (international conference proceedings)   Publisher:American Society of Civil Engineers  

    DOI: 10.1061/9780784484999

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  • Comprehensive hemocompatibility analysis on the application of diamond-like carbon to ePTFE artificial vascular prosthesis. International journal

    Takashi Goyama, Yasuhiro Fujii, Genya Muraoka, Tatsuyuki Nakatani, Daiki Ousaka, Yuichi Imai, Noriaki Kuwada, Tatsunori Tsuji, Takayuki Shuku, Haruhito A Uchida, Masahiro Nishibori, Susumu Oozawa, Shingo Kasahara

    Scientific reports   13 ( 1 )   8386 - 8386   2023.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    The aim of this study was to obtain comprehensive data regarding the hemocompatibility of diamond-like carbon (DLC)-coated expanded polytetrafluoroethylene (ePTFE). DLC increased the hydrophilicity and smoothened the surface and fibrillar structure, respectively, of the ePTFE. DLC-coated ePTFE had more albumin and fibrinogen adsorption and less platelet adhesion than uncoated ePTFE. There were scarce red cell attachments in in vitro human and in vivo animal (rat and swine) whole blood contact tests in both DLC-coated and uncoated ePTFE. DLC-coated ePTFE had a similar but marginally thicker band movement than uncoated-ePTFE with SDS-PAGE after human whole blood contact test. In addition, survival studies of aortic graft replacement in rats (1.5 mm graft) and arteriovenous shunt in goats (4 mm graft) were performed to compare the patency and clot formation between DLC-coated and uncoated ePTFE grafts. Comparable patency was observed in both animal models. However, clots were observed in the luminal surface of the patent 1.5 mm DLC-coated ePTFE grafts, but not in that of uncoated ePTFE grafts. In conclusions, hemocompatibility of DLC-coated ePTFE was high and comparable to that of uncoated ePTFE. However, it failed to improve the hemocompatibility of 1.5 mm ePTFE graft probably because increased fibrinogen adsorption canceled the other beneficial effects of DLC.

    DOI: 10.1038/s41598-023-35594-7

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  • Risk Evaluation for Earth-fill Dams due to Heavy Rains by Response Surface Method Reviewed

    Zheng, S, Nishimura, S, Shibata, T, Tateishi, T, Shuku, T

    Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards   17 ( 3 )   572 - 585   2023

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/17499518.2023.2164901

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  • Data assimilation for surface wave method by ensemble Kalman filter with random field modeling

    Yuxiang Ren, Shinichi Nishimura, Toshifumi Shibata, Takayuki Shuku

    International Journal for Numerical and Analytical Methods in Geomechanics   46 ( 15 )   2944 - 2961   2022.10

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/nag.3435

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nag.3435

  • Geotechnical uncertainty, modeling, and decision making Invited Reviewed

    Kok-Kwang Phoon, Zi-Jun Cao, Jian Ji. Yat Fai Leung, Shadi Najjar, Takayuki Shuku, Chong Tang, Zhen-Yu Yin, Yoshida Ikumasa, Jianye Ching

    Soils and Foundations   62 ( 5 )   2022.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    Modeling only constitutes one aspect of decision making. The prevailing limitation of applying modeling to practice is the absence of explicit consideration of uncertainties. This review paper covers uncertainty quantification (soil properties, stratification, and model performance) and uncertainty calculation with a focus on how it enhances the role of modeling in decision making (reliability analysis, reliability-based design, and inverse analysis). The key output from a reliability analysis is the probability of failure, where “failure” is defined as any condition that does not meet a performance criterion or a set of criteria. In contrast to the global factor of safety, the probability of failure respects both mechanics and statistics, is sensitive to data (thus opening one potential pathway to digital transformation), and it is meaningful for both system and component failures. Resilience engineering requires system level analysis. As such, geotechnical software can provide better decision support by computing the probability of failure/reliability index as one basic output in addition to stresses, strains, forces, and displacements. It is further shown that more critical non-classical failure mechanisms can emerge from spatially variable soils that can escape notice if the engineer were to restrict analysis to conventional homogeneous or layered soil profiles.

    DOI: 10.1016/j.sandf.2022.101189

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  • Data-driven model of the local wind field over two small lakes in Jyväskylä, Finland Reviewed

    Takayuki Shuku, Janne Ropponen, Janne Juntunen, Hiroshi Suito

    Meteorology and Atmospheric Physics   134 ( 1 )   2022.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>This study presents a data-driven model of the local wind field over two small lakes in Jyväskylä, Finland. Five temporary monitoring stations installed during the summers of 2015 and 2016 observed wind speed/direction around the two lakes. In addition, an official meteorological station located 15 km north of the lakes is permanently available. Our goal was to develop a model that could evaluate wind speed and direction over the two lakes using only data from the permanent station. Statistical analysis for the spatio-temporal wind data revealed that (1) local wind speed is correlated with the elevation and its cyclic pattern is identical to that of the official-station data, and (2) the local wind direction field is spatially homogeneous and is strongly correlated with the official-station data. Based on these results, we built two regression models for estimating spatial distribution of local wind speed and directions based on the digital elevation model (DEM) and official-station data. We compared the predicted wind speeds/directions by the proposed model with the corresponding observation data and a numerical result for model validation. We found that the proposed model could effectively simulate heterogeneous local wind fields and considers uncertainty of estimates.

    DOI: 10.1007/s00703-021-00857-3

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    Other Link: https://link.springer.com/article/10.1007/s00703-021-00857-3/fulltext.html

  • Benchmark examples for data-driven site characterisation Invited Reviewed

    Kok-Kwang Phoon, Takayuki Shuku, Jianye Ching, Ikumasa Yoshida

    Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards   16 ( 4 )   1 - 23   2022.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    Decision making in geotechnical engineering is always related to a project carried out at a specific site. It is natural for data-driven site characterization (DDSC) to attract the most attention in data-centric geotechnics. This paper proposed eight benchmark examples and a benchmarking procedure to support unbiased and competitive evaluation of emerging ML methods. The primary goal of DDSC is to bring the value of a “data first” agenda to practice, specifically to produce a 3D stratigraphic map of the subsurface volume below a full-scale project site and to estimate relevant engineering properties at each spatial point based on site investigation data and other relevant Big Indirect Data (BID). A reasonable full-scale ground 20 m long × 20 m wide × 10 m deep is adopted. Virtual grounds containing horizontal, inclined, or discontinuous soil layers and spatially varying synthetic cone penetration test data are created to test the performance of DDSC methods over a range of ground conditions. A benchmark example is defined by a combination of a virtual ground (“reality”) and a training dataset (measured “reality”). An additional benchmark example based on actual CPT data is included to check whether performance under virtual ground conditions holds under real ground conditions.

    DOI: 10.1080/17499518.2022.2025541

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  • A STUDY ON OPTIMAL DESIGN OF GEOTECHNICAL STRUCTURES USING QUANTUM ANNEALING Reviewed

    Takayuki SHUKU, Shinya YAMAMOTO

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   78 ( 2 )   116 - 127   2022

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejge.78.2_116

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  • SEISMIC RESPONSE ANALYSIS OF EARTH DAMS WITH GEOSTATISTICAL METHOD AND 3-D SURVEY

    Ryota OHASHI, Shin-ichi NISHIMURA, Minoru KANESHIGE, Toshifumi SHIBATA, Takayuki SHUKU

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   78 ( 2 )   140 - 152   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejge.78.2_140

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  • Case Histories on 2D/3D Underground Stratification Using Sparse Machine Learning Reviewed

    Takayuki Shuku, Jianye Ching

    International Journal of Geoengineering Case Histories   6 ( 4 )   35 - 47   2021.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Soil Stratification and Spatial Variability Estimated Using Sparse Modeling and Gaussian Random Field Theory Reviewed

    Ikumasa Yoshida, Takayuki Shuku

    ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering   7 ( 3 )   04021023 - 04021023   2021.9

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    Publishing type:Research paper (scientific journal)   Publisher:American Society of Civil Engineers (ASCE)  

    We propose a method for simultaneously estimating the trend and random components of soil properties using the least absolute shrinkage and selection operator (LASSO) for sparse modeling without assuming any basis functions and Gaussian random field theory, respectively. The uncorrelated observation noise is also estimated at the same time. A two-step algorithm is introduced to avoid the shrinkage problem of LASSO. Numerical examples with random realizations show that the method avoids shrinkage. The proposed method requires four parameters, namely, the variances of the random component and observation error, autocovariance distance, and regularization parameter, for one-dimensional problems. We propose a method that uses Akaike's information criterion or Bayesian information criterion and particle swarm optimization to determine these four parameters. It is shown that the detection ratio of the layer boundary is determined by the number of observation data and the difference between trend values. The proposed method is applied to actual cone penetration test data to estimate the trend component of the soil property.

    DOI: 10.1061/ajrua6.0001143

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  • Three-dimensional subsurface modeling using Geotechnical Lasso Reviewed

    Takayuki Shuku, Kok-Kwang Phoon

    Computers and Geotechnics   133   104068 - 104068   2021.5

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.compgeo.2021.104068

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  • Reliability-based design for earth-fill dams against severe natural disaster events

    Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku

    Soils and Foundations   61 ( 2 )   271 - 282   2021.4

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2020.09.004

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  • マラソン中の心事故予防に向けた心電モニタリングシステムの開発

    笠原 真悟, 逢坂 大樹, 坂野 紀子, 森田 瑞樹, 珠玖 隆行, 大澤 晋

    日本遠隔医療学会雑誌   16 ( 補刊号 )   32 - 32   2021.4

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    Language:Japanese   Publisher:(一社)日本遠隔医療学会  

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  • Challenges in data-driven site characterization Reviewed

    Kok-Kwang Phoon, Jianye Ching, Takayuki Shuku

    Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards   1 - 13   2021.3

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/17499518.2021.1896005

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  • A new approach to prevent critical cardiac accidents in athletes by real-time electrocardiographic tele-monitoring system

    笠原真悟, 逢坂大樹, 坂野紀子, 森田瑞樹, 珠玖隆行, 大澤晋

    JTTA Spring Conference抄録集   24回   144 - 144   2021.2

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  • 3次元計測に基づくため池堤体の有限要素モデル化と地震応答解析 Reviewed

    金重 稔, 西村伸一, 柴田俊文, 珠玖隆行

    農業農村工学会論文集   89 ( 1 )   I-181 - I-189   2021

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.11408/jsidre.89.I_181

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  • Trend estimation and layer boundary detection in depth-dependent soil data using sparse Bayesian lasso Reviewed

    Takayuki Shuku, Kok-Kwang Phoon, Ikumasa Yoshida

    Computers and Geotechnics   128   103845 - 103845   2020.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    This paper proposes a method for estimating trends and detecting layer boundaries in depth-dependent soil data based on a least absolute shrinkage statistical operator (lasso). Although the lasso appears to be promising for subsurface modeling because no predetermined basis functions or stratification models are required, it does not provide information on the uncertainty of its estimated solution, i.e., a point estimate. In subsurface modeling, however, characterization of uncertainty is pivotal because soil data can be (spatially) sparse and noisy. A lasso-based method that can quantify its estimation accuracy while preserving its attractive sparsity feature is proposed. The performance of this sparse Bayesian lasso (SBLasso) is demonstrated through numerical tests and an actual case study of its accuracy of trend estimation and layer boundary detection. The degree of accuracy or inaccuracy of estimation provided by the SBLasso clearly corresponds to data quality, such as the number of available data points, noise level, and noise correlation. A method of soil stratification based on SBLasso was also proposed, and the stratification results by SBLasso were compared with those produced by existing methods for validation.

    DOI: 10.1016/j.compgeo.2020.103845

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  • Bayesian Updating of Model Parameters by Iterative Particle Filter with Importance Sampling Reviewed

    Ikumasa Yoshida, Takayuki Shuku

    ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering   6 ( 2 )   04020007 - 04020007   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Society of Civil Engineers (ASCE)  

    Data assimilation with a particle filter (PF) has attracted attention for use in Bayesian updating. However, PFs have a problem known as degeneracy, where weights tend to concentrate into only a few particles after a few iterations (all other particles degenerate), which causes poor computational performance. This study discusses the applicability of a PF to the Bayesian updating of model parameters and probabilistic prediction with the updated model and proposes a method that uses a PF to limit degeneracy. The proposed method, called iterative particle filter with importance sampling (IPFIS), uses iterative observation updating in a PF, a Gaussian mixture model, and importance sampling. Two examples are used to demonstrate the proposed algorithm. In the first example, posterior distributions of the stiffness parameters of a two-degree-of-freedom model are identified. In the second example, IPFIS is applied to a consolidation settlement problem of a soft ground due to embankment loading, and probability distributions of the geotechnical parameters in an elastoplastic finite-element model and the simulated settlement displacements are updated based on time-series observation.

    DOI: 10.1061/ajrua6.0001047

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  • Disaster report of 2018 July heavy rain for geo-structures and slopes in Okayama

    S. Nishimura, Y. Takeshita, S. Nishiyama, S. Suzuki, T. Shibata, T. Shuku, M. Komatsu, B. Kim

    Soils and Foundations   60 ( 1 )   300 - 314   2020.2

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2020.01.009

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  • Introducing a novel electrocardiographic self-screening system for athletes in full marathon an initial experiment to prove a feasibility of sensing fabric wear

    坂野紀子, 逢坂大樹, 平野和也, 森田瑞樹, 珠玖隆行, 大澤晋, 佐能量雄, 笠原真悟

    JTTA Spring Conference抄録集   2020   16 - 16   2020.1

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  • The effect of local wind field on water circulation and dispersion of imaginary tracers in two small connected lakes Reviewed

    Janne Juntunen, Janne Ropponen, Takayuki Shuku, Kirsti Krogerus, Timo Huttula

    Journal of Hydrology   579   124137 - 124137   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jhydrol.2019.124137

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  • Evaluation of liquefaction probability of earth-fill dam over next 50 years using geostatistical method based on CPT Reviewed

    Kazunari Imaide, Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku, Akira Murakami, Kazunori Fujisawa

    Soils and Foundations   59 ( 6 )   1758 - 1771   2019.12

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2019.08.002

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  • A new approach to prevent critical cardiac accidents in athletes by real-time electrocardiographic tele-monitoring system: Initial trial in full marathon

    Daiki Ousaka, Noriko Sakano, Mizuki Morita, Takayuki Shuku, Kazuo Sanou, Shingo Kasahara, Susumu Oozawa

    Journal of Cardiology Cases   20 ( 1 )   35 - 38   2019.7

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jccase.2019.03.008

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  • An iterative Bayesian filtering framework for fast and automated calibration of DEM models Reviewed

    Hongyang Cheng, Takayuki Shuku, Klaus Thoeni, Pamela Tempone, Stefan Luding, Vanessa Magnanimo

    Computer Methods in Applied Mechanics and Engineering   350   268 - 294   2019.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cma.2019.01.027

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  • 地質統計手法に基づくため池堤体強度の空間分布評価 Reviewed

    今出和成, 西村伸一, 柴田俊文, 珠玖隆行

    農業農村工学会論文集   87 ( 1 )   II_29 - II_38   2019.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.11408/jsidre.87.II_29

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  • Evaluation of strength distribution at cut slope of decomposed granite with the use of sounding method and geophysical exploration method Reviewed

    Tatsuya Ueta, Shin-Ichi Nishimura, Kazunari Imaide, Toshifumi Shibata, Takayuki Shuku

    Paddy and Water Environment   17 ( 2 )   291 - 297   2019.4

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10333-019-00722-5

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    Other Link: http://link.springer.com/article/10.1007/s10333-019-00722-5/fulltext.html

  • Prediction of long-term settlement and evaluation of pore water pressure using particle filter Reviewed

    Toshifumi Shibata, Takayuki Shuku, Akira Murakami, Shin-ichi Nishimura, Kazunori Fujisawa, Noritaka Hasegawa, Satoshi Nonami

    Soils and Foundations   59 ( 1 )   67 - 83   2019.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2018.09.006

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  • Change Detection in Vital Signs Associated with Impending Death for Homecare Patients Using a Pressure-Sensing Mat Reviewed International journal

    Takayuki Shuku, Noriko Sakano, Mizuki Morita, Shingo Kasahara

    European Journal for Biomedical Informatics   14 ( 1 )   52 - 57   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.24105/ejbi.2018.14.1.9

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  • Probabilistic calibration of discrete element simulations using the sequential quasi-Monte Carlo filter Reviewed

    Hongyang Cheng, Takayuki Shuku, Klaus Thoeni, Haruyuki Yamamoto

    Granular Matter   20 ( 1 )   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10035-017-0781-y

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    Other Link: http://link.springer.com/content/pdf/10.1007/s10035-017-0781-y.pdf

  • EVALUATION OF THE SPATIAL VARIABILITY OF CONE PENETRATION RESISTANCE INSIDE AN EARTH-FILL DAM COMPOSED OF MATERIALS WITH DIFFERENT PARTICLE SIZE DISTRIBUTION Reviewed

    Kazunari IMAIDE, Shin-ichi NISHIMURA, Toshifumi SHIBATA, Takayuki SHUKU

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   74 ( 2 )   213 - 224   2018

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejge.74.213

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  • EFFECT OF TRANSFORMATION ERRORS ON SPATIAL VARIABILITY OF GROUND STRENGTH WITH SYNTHESIZED APPROACH OF CPT RESULTS AND SHEARWAVE VELOCITY Reviewed

    Tatsuya UETA, Shin-ichi NISHIMURA, Kazunari IMAIDE, Toshifumi SHIBATA, Takayuki SHUKU

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_95 - I_104   2018

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejam.74.i_95

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  • Key Points oil tlie reliability engineering IV: Data assimilation: Particle filter and merging particle filter Reviewed

    Yasutoshi Nomura, Ikumasa Yoshida, Takayuki Shuku, Tadanobu Sato

    Zairyo/Journal of the Society of Materials Science, Japan   65 ( 5 )   403 - 408   2016.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.2472/jsms.65.403

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  • Numerical simulation of embankment failure due to overflow by Moving Particle Semi-implicit method Reviewed

    T. Shuku, K. Fujisawa, S. Nishimura, T. Shibata

    IDRE Journal   84 ( 1 )   I_31 - -I_38   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japanese Society of Irrigation, Drainage and Rural Engineering  

    Recently, the evaluation of the failure potential of earth-filled dams has become important because of the increasing occurrence of storm rainfall. Although most instances of earth-filled dam failure are caused by overflow, in-depth knowledge of the mechanism of the erosion and failure process of embankments due to overflow is still lacking. This paper presents a numerical method for simulating an embankment erosion and failure process by the moving particle semi-implicit (MPS) method. To reasonably simulate the erosion and failure process of an embankment due to overflow, a simple erosion model whose parameters can be determined through erosion tests on embankment materials was newly incorporated into the original MPS method. An embankment erosion and failure process observed in a model test was simulated by the proposed MPS method to confirm its practicability. Although the simulation accuracy for the erosion rate is slightly low at the beginning of the erosion, the average simulated values of the erosion rate are almost the same as the experimental values. The proposed MPS method can be a useful tool in embankment design practices to simulate embankment erosion due to overflow and to discuss remedial measures against overflow.

    DOI: 10.11408/jsidre.84.I_31

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    Other Link: https://jlc.jst.go.jp/DN/JLC/20020753557?from=CiNii

  • VALIDATION OF PARAMETER IDENTIFICATION METHOD ON PREDICTION FOR LONGTERM CONSOLIDATION BEHAVIOR Reviewed

    Shin-ichi NISHIMURA, Toshifumi SHIBATA, Takayuki SHUKU

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   72 ( 2 )   I_35 - I_43   2016

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejam.72.i_35

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  • INVERSE ANALYSIS OF CONSOLIDATION FOR ACCURATE PREDICTION OF HORIZONTAL DISPLACEMENT Reviewed

    Toshifumi SHIBATA, Shin-ichi NISHIMURA, Takayuki SHUKU

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   72 ( 2 )   I_97 - I_107   2016

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejam.72.i_97

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  • Simplified Estimation of Risk from Floods due to Earth Dam Breaches Using Response Surface Methods Reviewed

    MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering   301 ( 1 )   I_47 - I_55   2016

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    Language:Japanese   Publisher:The Japanese Society of Irrigation, Drainage and Rural Engineering  

    Floods due to dam breaches have the greatest influential effect on hydraulic structures for irrigation and drainage, and estimating the costs of damage to these structures is important for risk assessment and management in agricultural land improvement projects. Existing methods for estimating damage costs require many types of asset data and usually a long time because of complications, and is not applicable for the practice in estimation of the damage costs. To overcome the problems, the authors have proposed a surrogate model called response surface (RS). This study aimed to verify the accuracy of the proposed RS by applying the surrogate model to risk evaluation of dam breaches due to rainstorms. We compared the damage costs of four earth dams calculated by using RS and existing methods, and found that the variances between the results of RS and existing methods was smaller than the unbiased variance of the RS based on 21 results of flow analysis. Therefore, the proposed method can easily estimate the risks of dam breaches due to rainstorms.

    DOI: 10.11408/jsidre.84.I_47

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  • Sensitivity analysis in stability evaluation of earthen embankments Reviewed

    Takayuki Shuku, Shin-Ichi Nishimura

    15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability   1723 - 1726   2015

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    This study has investigated sensitivities of input parameters in stability analysis of embankments to safety factor Fs based on experimental deign. In addition to the geotechnical parameters, parameters about geometry such as height, width, and slope gradient of embankments were also considered in the analysis. This study applied regression analysis based on orthogonal design to the sensitivity analysis. The geotechnical parameters required for the stability analysis were used in the sensitivity analysis, and the sensitivity of these parameters to Fs was investigated. The results of the sensitivity analysis showed that the parameters about geometry of embankments such as height and slope gradient are more sensitive to Fs, although the parameters about hydraulic characteristics of embankment material are less sensitive to the Fs.

    DOI: 10.3208/jgssp.JPN-034

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  • Uncertainty Evaluation in Slope Failure using Centrifuge Model Tests Reviewed

    Takayuki Shuku, Shin-ichi Nishimura, Ikumasa Yoshida

    GEOTECHNICAL SAFETY AND RISK V   353 - 357   2015

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    Strong nonlinear behavior such as slope failure involves large uncertainties. Even if we conduct model tests on slope failure under the same test conditions, we cannot reproduce the same results although the linear behavior can be reproduced with relative ease. This kind of uncertainties is well known as "aleatory uncertainty" and they should be distinguished clearly from the epistemic uncertainty in reliability-based design. However, characteristics of aleatory uncertainty have not been studied very well so far. This study quantitatively investigates the aleatory uncertainties involved in failure behavior of slopes thorough centrifuge model tests. The centrifuge model tests were conducted under the same test conditions twenty times to quantitatively investigate the variability of slip lines.

    DOI: 10.3233/978-1-61499-580-7-353

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  • An eco-friendly design method for geotechnical structures based on LCC Reviewed

    T. Shuku, S. Nishimura, Y. Shimokado, T. Shibata

    LIFE-CYCLE OF STRUCTURAL SYSTEMS: DESIGN, ASSESSMENT, MAINTENANCE AND MANAGEMENT   1398 - 1404   2015

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    This study presents an eco-friendly design method for infrastructures based on contingent valuation method (CVM). First, a questionnaire survey based on the CVM was conducted to estimate monetary values of stream habitat which can be damaged by river improvement works such as flood prevention works. Second, a design method which can quantitatively evaluate impacts on stream habitat due to flood prevention works was proposed by combining computation of non-uniform flow with a method of stream habitat estimation called physical habitat simulation model (PHABSIM). Finally, monetary value of environmental loss due to flood prevention works was estimated by using results of CVM, and the effectiveness of the eco-friendly design method was discussed through a numerical example.

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  • Sensitivity analysis of slope stability based on orthogonal designs Reviewed

    T. Shuku, S. Nishimura, T. Shibata

    Computer Methods and Recent Advances in Geomechanics   1043 - 1048   2015

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    This study has investigated sensitivity of input parameters in stability analysis of earthen embankments to its factor of safety (F-s) using an experimental design approach. Computer experiments based on orthogonal designs were carried out to achieve efficient experiments, and a linear regression model was applied to analyze the results of the experiment. The Standardized Regression Coefficients (SRCs) obtained from the regression analysis was employed as indexes of the sensitivity of the input parameters to the F-s. The results of the sensitivity analysis showed that the parameters about the geometry of embankments such as height and slope gradient are more sensitive to F-s, although the parameters about hydraulic characteristics of embankment materials are less sensitive to the F-s. In addition, interaction effects between input parameters were also analyzed, and its sensitivity to F-s was discussed.

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  • ESTIMATION OF POSTERIOR PROBABILITY DENSITY DISTRIBUTIONS BY SOME FILTERING ALGORITHMS FOR OBSERVATION UPDATE Reviewed

    SHUKU Takayuki, YOSHIDA Ikumasa, YAMAMOTO Shinya, TANAKA Kohji, FUJISAWA Kazunori, NOMURA Yasutoshi

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   71 ( 2 )   I_59 - I_70   2015

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    This study has investigated the applicability of the existing filtering algorithms to reliability evaluation of civil engineering structures by focusing on estimation accuracy of posterior probability distributions. This study focuses on six algorithms, the Particle Filter (PF), the Ensemble Kalman Filter (EnKF), the Merging Particle Filter (MPF), the Gaussian Mixture Filter (GMF), the Markov Chain Monte Carlo (MCMC) method, and the Iterative Particle Filter with Gaussian Mixture Models (IPFGMM). These algorithms were applied to estimation of posterior probability distributions of interstory stiffnesses in a two-degree-of-freedom shear building model. When the posterior probability distribution is unimodal, most of the algorithms can estimate the distribution with high accuracy. The EnKF, however, cannot accurately estimate even unimodal posterior probability distributions if it does not follow the Gaussian distribution. When the posterior probability distribution is bimodal, the EnKF and the MPF are not capable of computing the probability distribution. The PF is recommended, when a sufficient number of samples can be used with low computational cost, because of its simple algorithm and high feasibility. The IPFGMM can be more efficient when the simulation for each sample is computationally expensive.

    DOI: 10.2208/jscejam.71.I_59

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  • Simplified Estimation of Damage Costs from Floods due to Earth Dam Breaches Using Response Surface Methods Reviewed

    MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki

    Journal of the Agricultural Engineering Society, Japan   299 ( 5 )   I_147 - I_153   2015

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    Most of small earth dams in Japan were constructed at least 100 years ago and need to be improved because Japan is constantly at risk of severe earthquakes and heavy rainstorms. When improvements of earth dams are planned, small earth dams that have a higher risk of dam breaches should be given priority for improvement. Although a risk is defined as the product of occurrence probability and damage costs, estimating the damage costs using existing methods is very difficult and complicated. Therefore, simplified methods are necessary to select earth dams that must be preferentially improved. In order to overcome the difficulties in estimating damage costs, this study proposed a simplified estimation method for damage costs of floods due to earth dam breaches using a response surface method (RSM). RSM is a methodology that produces regression equations, called response surface, that quantitatively express the relationships between responses (output) and factors (input) by regression analyses based on experimental designs. Although many factors need to be considered to estimate damage costs of floods due to dam breaches, this study focused on four factors that largely affect the damage costs as based on results from a sensitivity analysis. Then a response surface that can estimate damage costs of floods was created by using the four parameters and its applicability was examined. As a result, the determination coefficient of the response surface R2 was 0.84 and the proposed response surface can be easily applied to estimate damage costs of floods due to dam breaches.

    DOI: 10.11408/jsidre.83.I_147

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  • A Simplified Method for Estimating Costs of Damage due to Floods Arising from Earth-dam Breaches Reviewed

    MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering   295 ( 1 )   39 - 46   2015

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    Earth-dam breaches arise from earthquakes and severe rainstorms and sometimes cause downstream floods. Floods have the greatest influential effect on hydraulic structures for irrigation and drainage, and estimating the costs of damage to these structures is important for risk assessment and management in agricultural land improvement projects. Although some methods for estimating damage costs have been proposed, most of these methods require many types of asset data and usually a long time because of complications. This paper proposes a simplified method for estimating damage costs in flood zones due to breach of earth-dams. The proposed method is based on asset data that are freely available, economical and easier to apply to practices in land improvement projects. Flood analyses of three actual earth-fill dams were performed, and the costs of damage in their flood zones estimated based on the results of the flood analyses using the proposed method. The proposed method estimated damage costs with ease, and accuracy was almost the same as other existing methods. Therefore, the proposed method can be a useful tool in agricultural land improvement projects.

    DOI: 10.11408/jsidre.83.39

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  • Observational Design Method for Earth Structures using Particle Filter Reviewed

    Takayuki Shuku, Shin-Ichi Nishimura, Toshifumi Shibata

    Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014   2449 - 2458   2014

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    This study presents a reliability-based design method for geotechnical structures based on the observational method, which can be used as a methodology for the performance verification of geotechnical structures. In the proposed method, the soil-water coupled finite element analysis is utilized as a performance-verification method, and stochastic uncertainties inherent in the geotechnical parameters are evaluated by a Monte Carlo simulation. The proposed method can select the optimum design/construction method from several design alternatives, from the viewpoint of Life Cycle Cost, and the predictions at the initial design stage are sequentially updated by the particle filter. The proposed method is applied to a numerical example of the construction problem of embankment specified quantitative performance criteria, such as allowable settlements and the probability of their exceedance, and the feasibility of the method is examined in this example.

    DOI: 10.1061/9780784413609.246

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  • Reliability-Based Design of Earth-Fill Dams to Mitigate Damage Due to Severe Earthquakes Reviewed

    S. Nishimura, T. Shuku, T. Shibata

    Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014   2350 - 2359   2014

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    This research deals with a strategy for the maintenance of geotechnical structures such as earth-fill dams. Standard penetration test (SPT) N-values are frequently used to determine the soil parameters. Firstly, a statistical model for the N-values is determined from sounding test results. In this research, however, Swedish weight sounding (SWS) tests are employed as they are simpler than SPT. Secondly, an indicator simulation is conducted to interpolate the spatial distribution of the N-values, and the results are utilized to find degraded areas inside the embankments and to maintain the embankments. Based on the statistical model for the N-values, the shear strength parameters are derived through the empirical relationships. Then, a reliability analysis of the embankments is conducted considering the variability of the internal friction angle and the seismic hazard.

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  • Data assimilation using the particle filter for identifying the elasto-plastic material properties of geomaterials Reviewed

    Akira Murakami, Takayuki Shuku, Shin-ichi Nishimura, Kazunori Fujisawa, Kazuyuki Nakamura

    INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS   37 ( 11 )   1642 - 1669   2013.8

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    A computational method, incorporating the finite element model (FEM) into data assimilation using the particle filter, is presented for identifying elasto-plastic material properties based on sequential measurements under the known changing traction boundary conditions to overcome some difficulties in identifying the parameters for elasto-plastic problems from which the existing inverse analysis strategies have suffered. A soil-water coupled problem, which uses the elasto-plastic constitutive model, is dealt with as the geotechnical application. Measured data on the settlement and the pore pressure are obtained from a synthetic FEM computation as the forward problem under the known parameters to be identified for both the element tests and the ground behavior during the embankment construction sequence. Parameter identification for elasto-plastic problems, such as soil behavior, should be made by considering the measurements of deformation and/or pore pressure step by step from the initial stage of construction and throughout the deformation history under the changing traction boundary conditions because of the embankment or the excavation because the ground behavior is highly dependent on the loading history. Thus, it appears that sequential data assimilation techniques, such as the particle filter, are the preferable tools that can provide estimates of the state variables, that is, deformation, pore pressure, and unknown parameters, for the constitutive model in geotechnical practice. The present paper discusses the priority of the particle filter in its application to initial/boundary value problems for elasto-plastic materials and demonstrates a couple of numerical examples. Copyright (c) 2012 John Wiley & Sons, Ltd.

    DOI: 10.1002/nag.2125

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  • 模型実験結果に基づく長期沈下予測法の検証 Reviewed

    西村伸一, 珠玖隆行, 山田典弘, 柴田俊文

    土木学会応用力学論文集   16   I_29 - I_38   2013

  • Decision Making for Residual Settlements Measures in Small Construction Projects Reviewed

    WAKABAYASHI Takashi, SHUKU Takayuki, MURAKAMI Akira, TAGUCHI Kiyotaka

    Journal of the Agricultural Engineering Society, Japan   81 ( 6 )   489 - 501   2013

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    This paper presents a novel observational method, using data assimilation and soil-water coupled elasto-plastic finite element computation, for small and short-period construction projects for which observation data have not been utilized to revise the design during construction due to a limited budget. The proposed procedure is examined for its application to an actual construction project. Firstly, the final settlement of the structure is evaluated using the identified material properties by both data assimilation, using the observed settlement, and in situ physical soil tests. Secondly, the probabilistic distribution of the final settlement of the structure is obtained from the identified values and the probabilistic density function of the parameters by data assimilation using observations conducted during construction. To reduce the settlement at the final stage of construction, estimated by the probabilistic distribution not to exceed the performance criterion, a construction sequence has been adopted from among the available design alternatives.

    DOI: 10.11408/jsidre.81.489

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  • Risk Evaluation in Neighboring Work Using Data Assimilation Reviewed

    WAKABAYASHI Takashi, MURAKAMI Akira, SHUKU Takayuki

    Journal of the Agricultural Engineering Society, Japan   80 ( 5 )   425 - 435   2012.10

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    This paper presents the parameter identification of an elasto-plastic constitutive model for geomaterials and a risk evaluation for neighboring work based on a data assimilation using the particle filter (PF) and incorporating a soil-water coupled finite element analysis with an elasto-plastic model.  After the numerical implementation of input data for the soil-water coupled FEM is examined, based on an in situ investigation, its applicability to an actual excavation work is discussed.  A risk assessment for an alternative design, using the probability density which the PF computes and updates on the basis of observations, is also proposed.  It is revealed that, for a practical example, the FEM results using the parameters identified by PF show a good agreement with the observations and that a quantitative and reliable risk evaluation can be achieved using the proposed method.

    DOI: 10.11408/jsidre.80.425

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  • Parameter identification for Cam-clay model in partially loading tests using the particle filter Reviewed

    T. Shuku, A. Murakami, S. Nishimura, K. Fujisawa, K. Nakamura

    Soils and Foundations   52   279 - 298   2012

  • データ同化による地盤構造物内の劣化箇所同定に関する基礎的研究 Reviewed

    珠玖隆行, 西村伸一, 藤澤和謙

    土木学会応用力学論文集   50   I_89 - I_101   2012

  • 粒子フィルタを用いた軟弱地盤の残留沈下予測 Reviewed

    西村伸一, 珠玖隆行, 西村友希, 藤澤和謙, 村上 章

    土木学会論文集A2分冊(応用力学)特集号, Vol.68. No.2, pp.I_103-114   2012

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    DOI: 10.2208/jscejam.68.I_103

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  • 土の侵食速度を用いた堤体の越流破堤解析 Reviewed

    藤澤和謙, 村上 章, 西村伸一, 珠玖隆行

    土木学会論文集A2分冊(応用力学)特集号, Vol.68, No.2, pp.I_317-326   2012

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    DOI: 10.2208/jscejam.68.I_317

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  • データ同化に基づいた信頼性解析法による土構造物の性能照査 Reviewed

    珠玖隆行, 西村伸一, 村上 章, 西村有希, 藤澤和謙

    地盤工学ジャーナル,Vol.6, No.3, pp.415-426   2011

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    DOI: 10.3208/jgs.6.415

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Books

  • Uncertainty, Modeling, and Decision Making in Geotechnics

    Kok-Kwang Phoon, Takayuki Shuku, Jianye Ching( Role: Joint editor)

    ( ISBN:9781032367491

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  • Prediction of the probability of overflow by heavy rains assuming rise in temperature

    三原嵩史, 西村伸一, 工藤亮治, 柴田俊文, 珠玖隆行

    農業農村工学会大会講演会講演要旨集(CD-ROM)   2023   2023

  • 気温上昇を想定した豪雨予測によるため池破堤確率の予測

    舟木遼, 西村伸一, 柴田俊文, 珠玖隆行, 工藤亮治

    農業農村工学会誌   90 ( 8 )   2022

  • Using the ensemble data assimilation for stiffness evaluation of an embankment Reviewed

    Ren, Y, Nishimura, S, Shibata, T, Shuku, T

    Proc. of ISRERM2022   419 - 425   2022

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    DOI: 10.3850/978-981-18-5184-1_MS-13-067-cd

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  • マラソン中の心事故予防に向けた心電モニタリングシステムの開発

    笠原 真悟, 逢坂 大樹, 坂野 紀子, 森田 瑞樹, 珠玖 隆行, 大澤 晋

    日本遠隔医療学会学術大会プログラム・抄録集   24回   144 - 144   2021.2

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  • Heart rate monitoring in full marathon for preventing critical cardiac accidents

    坂野紀子, 逢坂大樹, 平野和也, 山根卓大, 森田瑞樹, 珠玖隆行, 大澤晋, 佐能量雄, 笠原真悟

    日本生体医工学会大会プログラム・抄録集(Web)   59th ( Abstract )   406 - 406   2020

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    The majority of marathon deaths are caused by sudden cardiac arrest (SCA), which occur in approximately 1 in 57,000 runners. Although prompt resuscitation, including early use of AED, improves survival, the deployment of enough trained medical staff and AEDs is difficult due to increased cost. Moreover, most victims of exercise-related SCA have no premonitory symptoms. Therefore, we tried to use a novel approach to prevent sudden cardiac deaths (SCD) using monitoring system. As a result, 19 out of 20 runners had reasonable measurement results and sufficient monitoring without complications related to this trial was possible. However, many investigations and improvements, such as improving cost-effectiveness, reducing noise, and automating the monitoring system, are needed for practical application of these devices for athletes. As a next step, we would establish a novel strategy to reduce SCDs in athletes using next generation devices, which includes an alarm system with early application of AED.

    DOI: 10.11239/jsmbe.annual58.406

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  • 市民マラソンでの遠隔モニタリングを用いた安全安心の循環管理

    笠原 真悟, 坂野 紀子, 大澤 晋, 逢坂 大樹, 森田 瑞樹, 珠玖 隆行, 佐能 量雄

    日本遠隔医療学会学術大会プログラム・抄録集   23回   64 - 64   2019.10

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  • Reliability analysis for geotechnical structures using iterative particle filter

    T. Shuku, I. Yoshida

    Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018   1067 - 1073   2019.1

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    © 2019 Taylor &amp; Francis Group, London. Bayesian updating is a versatile method to update models and the parameters with observation data and enable quantitative reliability analysis for civil infrastructures. Although the particle filter (PF) is one of the promising method for Bayesian updating, the PF often confront a serious problem called “filter degeneracy” where all but one of the weights are very close to zero. We present a new algorithm for Bayesian updating called iterative particle filter with Gaussian mixture models (IPFGMM). The idea behind IPFGMM is to apply Gaussian mixture model (GMM) as the proposal density and to introduce an iterative algorithm to avoid filter degeneracy. The proposed method is demonstrated by application to parameter identification in two-degree-off reedom (2DoF) building model and reliability analysis of a geotechnical structure using elasto-plastic finite element analysis.

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  • Uncertainty in centrifuge test of slope failure and its simulation by MPS method Reviewed

    Ikumasa Yoshida, Takayuki Shuku

    GEOTECHNICAL SAFETY AND RISK V   347 - 352   2015

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    We sometimes encounter a case in which very small change of computation or experiment condition causes the significant difference in response when strong nonlinearity is involved. Slope failure simulation due to gravity by MPS method is performed to examine feature of uncertainty. The simulation results show that the output uncertainty is proportional to input uncertainty in weak nonlinear or linear behavior. In strong nonlinear behavior, the output uncertainty is constant irrespective of uncertainty level of input data when the input uncertainty is less than certain level. The range of the constant uncertainty depends on the strength of nonlinearity in the phenomenon. Comparison of uncertainties in centrifuge slope failure test and its simulation by MPS method is shown and discussed.

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  • 局所載荷模型実験結果に基づく二次圧密挙動の予測

    山田典弘, 西村伸一, 珠玖隆行, 藤澤和謙

    第62回理論応用力学講演会   2013.3

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    DOI: 10.11345/japannctam.62.0.203.0

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  • 遠心模型実験における地盤パラメータの同定 Reviewed

    珠玖隆行, 西村伸一, 藤澤和謙, 村上 章

    第62回理論応用力学講演会   2013

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  • 浸透破壊時の土粒子移送速度についての実験的研究 Reviewed

    藤澤和謙, 村上 章, 西村伸一, 珠玖隆行

    第61回理論応用力学講演会(招待講演)   2012

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  • データ同化による地盤構造物の信頼性設計に関する基礎的研究 Reviewed

    珠玖隆行, 西村伸一, 藤澤和謙, 村上章

    理論応用力学講演会講演論文集(Web)   61st   WEB ONLY OS04-10   2012

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Awards

  • GEOSNet Young Researcher Award

    2022.12   Geotechnical Safety Network  

    Takayuki Shuku

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  • Best Paper Award

    2020.4   Japan Society of Civil Engineering  

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  • Bright Spark Lecture Award

    2019.12   International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)   Sparse modeling in Geotechnical Engineering

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  • 2019 Editorial Board Member Award, Soils and Foundations

    2019.8   Soils and Foundations Editorial Board  

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  • Best Paper Award

    2018.4   Japanese Geotechnical Society, Chugoku Branch  

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  • Best Paper Aard

    2013.6   Japanese Geotechnical Society   Parameter identification for Cam-clay model in partial loading model tests using the particle filter

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  • Young Researcher Award

    2013.6   Japanese Geotechnical Society  

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Research Projects

  • 微小・低重力環境下における高効率保水・有機質土壌の生成と展開

    Grant number:23K17386  2023.06 - 2027.03

    日本学術振興会  科学研究費助成事業  挑戦的研究(開拓)

    森 也寸志, 前田 守弘, 登尾 浩助, 齊藤 忠臣, 珠玖 隆行, 宗村 広昭

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    Grant amount:\25740000 ( Direct expense: \19800000 、 Indirect expense:\5940000 )

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  • 集中群配置型クロスホールミューオン探査手法の開発

    Grant number:22K19223  2022.06 - 2025.03

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    西村 伸一, 柴田 俊文, 珠玖 隆行

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    Grant amount:\6240000 ( Direct expense: \4800000 、 Indirect expense:\1440000 )

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  • A feasibility study on introduction of stock-management system to irrigation facilities in Vietnam

    Grant number:18KK0187  2019.02 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    佐藤 周之, 上野 和広, 長谷川 雄基, 珠玖 隆行

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    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    本研究課題は,ベトナム社会主義共和国内における農業水利施設のコンクリートを対象とし、品質評価ならびに農業水利施設の機能不全の原因究明を行うとともに,材料学的な見地から最適な施工・維持管理手法の提案を行うものである。
    本研究の遂行には、ベトナムにおける現地調査が不可欠である。そのため、2019年度中に原位置調査を実施するための発電機や変圧器、その他様々な資・機材の手配や調査計画の立案を進め、2019年度末からの実行へと移るだけの状態としていた。ところが2019年度末からの世界的なコロナ感染拡大の影響を受け、まず2020年3月のベトナムへの渡航を中止した。その際は、ベトナム側の入国禁止措置が主たる理由であった。2020年度初以降、日本での感染拡大も続き、海外への渡航が全面的に困難となっていった。2021年度は、我が国ではようやく11月、12月に感染拡大が収束したため渡航を計画したが、今度はベトナム側が再度のロックダウンとなり、研究協力者であるVinh大学側の研究者にも感染者が出たとの連絡があった。我が国でもオミクロン株の流行が起こり、そのまま年度末を迎えた。そこで、研究分担者ならびに現地カウンターパートの了承を得た上で、当初予定であった研究終了期間を2021年度末から2022年度末へと、再度の研究期間の延長申請を行った。以上の理由から、本年度(2021年度)は具体的な研究成果を上げることができなかった。そこで、2022年度への延長申請を行った。
    研究活動としては、研究手法と想定する内容の基礎研究を国内で進め、一定の進捗をみることができた。

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  • Automization of structural design based on machine learning

    Grant number:18K05880  2018.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    珠玖 隆行

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    2021年度は,これまで構築してきた方法論の実務への適用性を考慮し,計算コストを抑えた設計の代替モデルの構築,および地盤の自動モデル化を達成するため,機械学習の1つの方法であるガウス過程回帰に着目し,その適用性を検証した.ガウス過程回帰は隠れ素子数無限大の1層のニューラルネットワークと等価であるため,2021年度に実施した研究はニューラルネットワークの適用性検証の研究とも解釈できる.研究計画では,設計の代替モデル(提案書ではエミュレータと記載)として,ニューラルネットワークを利用する予定であり,その計画を遂行することを目的とした.ガウス過程回帰は地質統計学の分野で利用されてきたクリギング(kriging)と本質的には同じであるが,用語の使い方の違いや分散,自己相関モデルの位置づけや解釈に違いがあることから,最初に用語を整理した.次に,人工的な模擬データおよびガウス過程回帰のコードを作成し,その挙動を調べた.研究の結果,ガウス過程回帰はデータの数が少なく,未知数が多い問題に適用可能であり,とくに本研究で対象としている水利施設の設計には適していることがわかった.一方,データの数が莫大な問題に対しては,計算上の工夫が必要であり,そのような問題に対しては,2019年度,2020年度に研究したスパースモデリングが有効になる.

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  • Development of an alternative growth curve which is concerned with the prevention of lifestyle diseases through deep learning

    Grant number:18K11021  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Haga Chiyori

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    Lifestyle-related diseases are a global health issue, but effective remedies have not been established. We worked on this research subject in order to build evidence of the approach strategy by the life course approach. The task is divided into three goals: Goal 1: Construction of a system for big data collection, Goal 2: Improvement of accuracy of pattern classification of physique transition in childhood and physique prediction after adolescence by adiposity rebound (AR) Examination of ability, goal 3. It was a study of domestic and foreign guidelines for an approach starting from the embryonic period. As a result, the physique of Japanese children can be classified into 4 boys and 3 girls, and the AR period is 3 to 7 years old, and AR under 6 years old may significantly increase the risk of developing obesity in early adolescence. Indicated.

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  • Mathematical modeling for local wind fields based on numerical analysis and data-driven modeling

    Grant number:18K03408  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Suito Hiroshi

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    This study presents a numerical simulation and a data-driven model of a local wind field over two small lakes in Jyvaskyla, Finland. Five temporary monitoring stations observed wind speed/direction around the two lakes. In addition, an official meteorological station located 15 km north of the lakes is permanently available. Numerical simulations based on digital elevation model (DEM) and laser-scanned height data provides characteristics of the local wind field around the targeted lakes. Based on a statistical analysis for the spatio-temporal wind data, we built two regression models for estimating spatial distribution of local wind speed and directions based on the DEM and official-station data. We compared the predicted wind speeds/directions by the proposed model with the corresponding observation data and a numerical result for model validation. We found that the proposed model could effectively simulate heterogeneous local wind fields and considers uncertainty of estimates.

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  • Decision making based on high-accuracy specification of geo-structures with use of 3-dimensional survey and inside diagnostic technique

    Grant number:16H02577  2016.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Nishimura Shin-ichi

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    Grant amount:\40560000 ( Direct expense: \31200000 、 Indirect expense:\9360000 )

    The outcome of this project is the development of the inside inspection technique of the earth-fills, and the 3-dimensional finite element modeling system based on the 3D survey system. By the unified techniques, the high accuracy inspection of the earth-fill structures has become available. The risk assessment method has been proposed based on the inspection. The proposed method has made the decision making for the countermeasures against the natural disaster events possible. The concrete items of the outcome are as follows.
    (1) Development of the new Swedish Weight Sounding, in which the microphone installed inside to record the sound, and which can move on the slopes; (2) Development of the method of the inspection inside the earth-fills and the grounds based on the sounding, the geophysical survey, and geostatistical simulation; (3) 3D-FEM modeling derived from the 3D geological survey; (4) Model seepage failure tests; (5) Risk assessment of the actual group earth-fill dams.

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  • Methodology for rockbolt reinforcement and evaluation of interrelation between irrigation tunnels and grounds

    Grant number:15K07648  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Shibata Toshifumi

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    The maintenance of damaged irrigation tunnels has become a major social concern, and thus the evaluation of damage behavior of the current tunnels is important. Voids behind the tunnel lining may be created during or after construction by the conventional method, and the voids are the main factors for the failure. For the maintenance of the tunnel structure, the understanding of the interaction behavior between the ground and the tunnel lining with the void is required. The comprehension of the interaction after backfilling of the void is also needed because of the design of the reinforcement.
    This study presents the interaction behaviors in the model test and the numerical analysis. To investigate the local deformation and the damage pattern, the comparison of the model test results and numerical results is carried out. The comparison of the convergence in the analysis is shown for better understanding of the reinforcement effect of the lockbolts.

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  • Establish of recycle system for deposited sludge in lakes and ponds by use of classification, dehydration and physico-chemical improvements

    Grant number:15K14822  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Nishimura Shin-ichi

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    Grant amount:\3900000 ( Direct expense: \3000000 、 Indirect expense:\900000 )

    In this research, recycle system of dredged sludge in lakes, canals and ponds has been proposed to proceed the reuse of the sludge. Firstly, the ordinary filter-press machine is improved by adding several process, and the optimum procedure of dehydration, air blow, vacuum, and desiccation has been identified. Secondly, recycle methods of the dredged sludge dehydrated and desiccated as geo-material were examined. In results, the desiccation could increase the strength of the sludge improved by the stabilizer. Since the deposited sludge includes large amount of fertilizer, the dredged sludge can be supposed to be effective as agricultural material. In consequence of planting tests, it has been clarified the desiccation temperature affects the growth of the plants.

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  • Health Monitoring for Infrastructures using Mechanoluminescense

    Grant number:15K18759  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Shuku Takayuki, NISHIMURA Shin-ichi, SHIBATA Toshifumi

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    Grant amount:\3770000 ( Direct expense: \2900000 、 Indirect expense:\870000 )

    Maintenance of aging infrastructures is a growing problem. Cost-efficient maintenance and management of civil infrastructures require balanced consideration of both structural performance and the total cost accrued over the entire life-cycle considering uncertainties. For that purpose, inspection and monitoring techniques for aging existing structures have been proposed.
    Mechanoluminescent (ML) can be a useful tool to inspect existing infrastructures.
    In this study, the system for measuring ML intensity was newly developed and was applied to unconfined compression test. Measured ML intensity was compared to the applied stress. The relationship between ML intensity and applied stress shows unique curve, and the applied stress can be visually estimated based on ML.

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