Performance information

• A FUNDAMENTAL STUDY ON THE APPLICATION OF ENERGY-BASED OVERSET FINITE ELEMENT METHOD TO DYNAMIC ANALYSIS　　　　　　　　　　　　　　　
  KIMURA Harusato; TOMOBE Haruka; SHARMA Vikas; MORIKAWA Hitoshi
  Journal of Japan Association for Earthquake Engineering, Volume：25, Number：4, First page：4_24, Last page：4_36, Mar. 2025, [Reviewed]
  The preparation of a mesh is a costly procedure in finite element analyses. Energy-based overset finite element method (EbO-FEM) is a method that facilitates the creation of the mesh by composing several subdomains into a single computational domain. This paper presents a fundamental study to extend the EbO-FEM to dynamic problems, focusing on the one-dimensional scalar wave problem. In particular, the relationship between the parameter representing the degree of coupling and the magnitude of the undesired reflected waves generated at the overlapping regions is investigated. The results show that the EbO-FEM provides as accurate a solution as the conventional FEM when adopting well-tuned values as the parameter. Error analysis in the frequency domain showed that the unwanted reflected wave generated at the overlapping region is controlled by the characteristic of the incident wave and the size of the overlapping region. Numerical examples of coupling the computational domain with different materials implied that the overlapping region acts stiffer than it is. These results suggested that the overlapping region should be as small as possible to obtain an accurate solution, even though the EbO-FEM is an overlapping mesh method.
  JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING, English
  DOI：https://doi.org/10.5610/jaee.25.4_24
  DOI ID：10.5610/jaee.25.4_24, eISSN：1884-6246
• AN ENERGY-BASED OVERSET FINITE ELEMENT METHOD FOR MODAL ANALYSIS ON RIGID FRAME BRIDGES　　　　　　　　　　　　　　　
  TOMOBE Haruka; SHARMA Vikas; KIMURA Harusato; MORIKAWA Hitoshi; IIYAMA Kahori; SAKAI Kimitoshi; Yu Chen Ping
  Journal of Japan Association for Earthquake Engineering, Volume：25, Number：4, First page：4_86, Last page：4_96, Mar. 2025, [Reviewed], [Lead, Corresponding], ［Internationally co-authored］
  This paper proposes a modal analysis method based on the energy-based overset finite element method (EbO-FEM) for rigid frame bridges. Rigid frame bridges and the foundations have complex geometries, which makes the mesh generation for finite element analysis expensive. The EbO-FEM has been developed to reduce the cost of mesh generation by allowing the use of nonconforming meshes without iterative computations. However, the EbO-FEM has only been applied to the static analysis and the applicability for the modal analysis has not been investigated. We applied the EbO-FEM for the finite element modal analysis, evaluated the accuracy of the method by comparing the solutions with existing FEM solutions, and utilized the EbO-FEM for the parameter identification with records of microtremors through the following procedure. First, a modal analysis of the virtual cantilever beam was performed to verify the accuracy, and the EbO-FEM solution agreed well with the conventional FEM solutions under different discretization scales, where overlapping regions is carefully localized. Second, the natural vibration modes and frequencies are estimated using the EbO-FEM for a frame bridge under construction. The EbO-FEM gives similar natural vibration modes to ones estimated by the frequency domain decomposition (FDD) method, and the elastic moduli of the surface soils were estimated so that the corresponding natural frequencies were consistent. The estimated elastic moduli were not significantly different from the data obtained from the preliminary survey. Above all, it was found that EbO-FEM can be as accurate as conventional FEM when the mesh overlapping is carefully minimized, in the modal analysis in spite of allowing non-conforming mesh.
  JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING, English, Scientific journal
  DOI：https://doi.org/10.5610/jaee.25.4_86
  DOI ID：10.5610/jaee.25.4_86, eISSN：1884-6246, 共同研究・競争的資金等ID：39698416;42659165;39698417;35670244
• 振動計測と物理シミュレーションを用いた耐倒伏性飼料用トウモロコシ品種・系統の迅速選抜手法へ向けて　　　　　　　　　　　　　　　
  友部遼; 中島大賢; 加藤洋一郎
  Number：829, Jun. 2024, [Invited], [Lead, Corresponding]
  ISSN：0389-1348, J-Global ID：202402240362245610
• 超小型加速度センサーとシミュレーションを利用したトウモロコシの倒伏予測　　　　　　　　　　　　　　　
  友部遼; 中島大賢; 加藤洋一郎
  Volume：82, Number：1, May 2024, [Invited], [Lead, Corresponding]
  ISSN：0914-8981, J-Global ID：202402284133159289
• On the arbitrary precision and the explicit time integration scheme for semi-discretized finite element method based using wave kernel function
  Haruka Tomobe; Vikas Sharma; Harusato Kimura; Hitoshi Morikawa; Hidekazu Yoshioka; Jun Kurima; Kazunori Fujisawa
  Japanese Geotechnical Society Special Publication, Volume：10, Number：35, First page：1317, Last page：1321, Mar. 2024, [Reviewed], [Lead, Corresponding]
  The Japanese Geotechnical Society, Scientific journal
  DOI：https://doi.org/10.3208/jgssp.v10.os-24-01
  DOI ID：10.3208/jgssp.v10.os-24-01, eISSN：2188-8027
• Orlicz risks for assessing stochastic streamflow environments: a static optimization approach
  Hidekazu Yoshioka; Haruka Tomobe; Yumi Yoshioka
  Stochastic Environmental Research and Risk Assessment, Oct. 2023, [Reviewed]
  Abstract
  
  This study applies novel risk measures, called Orlicz risks, to the risk and uncertainty evaluation of the streamflow discharge as a primary driver of hydrological and hydraulic processes of interest in civil and environmental engineering. We consider the mixed moving average process governing the discharge whose statistics are explicitly represented as some product of a time-scale characterizing the flow attenuation and a jump moment governing the size and frequency of jumps. The classical Orlicz risks are extended so that not only the upper tail risk but also the lower one of the jump size and attenuation of the discharge can be evaluated within a single mathematical framework. Further, the risk and uncertainty can be individually quantified in a tractable manner by the proposed Orlicz risks. Computing the Orlicz risks reduces to solving a pair of novel static optimization problems that are solvable semi-analytically. The risk and uncertainty involved in the streamflow dynamics can be consistently evaluated by specifying few user-dependent parameters. The associated Radon–Nikodym derivatives as the worst-case model uncertainties are obtained as byproducts. Sufficient conditions for the well-posedness of the Orlicz risks are discussed and numerical algorithms for computing them are presented. We finally apply the proposed framework to a statistical analysis of the streamflow discharge time series data collected at mountainous river environments.
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s00477-023-02561-7
  DOI ID：10.1007/s00477-023-02561-7, ISSN：1436-3240, eISSN：1436-3259
• Method for estimating azimuthal intensity distribution of microtremors using simple arrays
  Harusato Kimura; Haruka Tomobe; Hitoshi Morikawa
  Geophysical Journal International, Jun. 2023, [Reviewed]
  Summary
  
  In the present paper, a method is proposed for estimating the intensity distribution of microtremors for the arrival direction, from simultaneous observations of vertical motion, using an array of simple geometry consisting of only three receivers. This method is based on the fact that the complex coherency function, which is defined as the normalized cross-spectrum of microtremor recordings observed at two sites, contains information about the azimuthal intensity distribution of the microtremor field. To obtain the azimuthal intensity distribution from a limited number of conditions, the functional form of the azimuthal intensity distribution of the microtremor field was assumed and its parameters were estimated. Information on the arrival direction of the microtremor field was specifically obtained using particle swarm optimization (PSO), one of the metaheuristic methods, and then employed to identify the parameters. The proposed method was applied to ideal synthetic data to clarify the potential problems that may arise from using PSO as the core algorithm. Despite PSO-induced errors, the proposed method was able to accurately infer directional information over a wide frequency range. The proposed method was also applied to actual field data to verify its effectiveness and applicability. The results indicate that the proposed method can provide similar results to the frequency-wavenumber (FK) method in a wide frequency range. The quasi-FK spectrum, an effective mode representation of the FK spectrum, was displayed to visualize the directionality.
  Oxford University Press (OUP), Scientific journal
  DOI：https://doi.org/10.1093/gji/ggad228
  DOI ID：10.1093/gji/ggad228, ISSN：0956-540X, eISSN：1365-246X
• Estimation of phase velocity using array observation of microtremors with arbitrary shape
  Harusato Kimura; Hitoshi Morikawa; Haruka Tomobe; Kahori Iiyama
  Earth, Planets and Space, Volume：75, Number：1, May 2023, [Reviewed]
  Abstract
  
  To estimate the phase velocity using the array observations of microtremors, some algorithms for the estimation include constraints on the array shape, such as equilateral triangles or the placement of receivers on a circle, in order to reduce the estimation error of the phase velocity. In the present study, a direct estimation technique is introduced for the phase velocity using records obtained through an array with an arbitrary shape based on a complex coherency function (CCF), where CCF is defined as the normalized cross spectrum of the microtremor records observed simultaneously by two receivers. The particle swarm optimization (PSO) method, one of metaheuristic optimization methods, is applied and optimal values are provided for the phase velocity and other unknown parameters. Approximate representations of the stochastic properties for the unknown variables are analytically derived based on the discrete representation of the CCF, for a case where the arrival directions of microtremors are treated as random variables following a uniform distribution. Furthermore, the validity of the proposed method is confirmed using numerical simulations and actual observation records.
  
  Graphical Abstract
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1186/s40623-023-01831-6
  DOI ID：10.1186/s40623-023-01831-6, eISSN：1880-5981
• A mechanical theory of competition between plant root growth and soil pressure reveals a potential mechanism of root penetration
  Haruka Tomobe; Satoru Tsugawa; Yuki Yoshida; Tetsuya Arita; Allen Yi-Lun Tsai; Minoru Kubo; Taku Demura; Shinichiro Sawa
  Scientific Reports, Volume：13, Number：7473, May 2023, [Reviewed], [Lead]
  Abstract
  
  Root penetration into the soil is essential for plants to access water and nutrients, as well as to mechanically support aboveground structures. This requires a combination of healthy plant growth, adequate soil mechanical properties, and compatible plant–soil interactions. Despite the current knowledge of the static rheology driving the interactions at the root–soil interface, few theoretical approaches have attempted to describe root penetration with dynamic rheology. In this work, we experimentally showed that radish roots in contact with soil of specific density during a specific growth stage fail to penetrate the soil. To explore the mechanism of root penetration into the soil, we constructed a theoretical model to explore the relevant conditions amenable to root entry into the soil. The theory indicates that dimensionless parameters such as root growth anisotropy, static root–soil competition, and dynamic root–soil competition are important for root penetration. The consequent theoretical expectations were supported by finite element analysis, and a potential mechanism of root penetration into the soil is discussed.
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1038/s41598-023-34025-x
  DOI ID：10.1038/s41598-023-34025-x, eISSN：2045-2322
• Modeling and computation of cost-constrained adaptive environmental management with discrete observation and intervention　　　　　　　　　　　　　　　
  Hidekazu Yoshioka; Motoh Tsujimura; Haruka Tomobe
  Journal of Computational and Applied Mathematics, Volume：424, First page：114974, Last page：114974, May 2023, [Reviewed]
  English, Scientific journal
  DOI：https://doi.org/10.1016/j.cam.2022.114974
  DOI ID：10.1016/j.cam.2022.114974, ISSN：0377-0427, eISSN：1879-1778, Web of Science ID：WOS:000923240900001
• Non-destructive high-throughput measurement of elastic-viscous properties of maize using a novel ultra-micro sensor array and numerical validation
  Taiken Nakashima; Haruka Tomobe; Takumi Morigaki; Mengfan Yang; Hiroto Yamaguchi; Yoichiro Kato; Wei Guo; Vikas Sharma; Harusato Kimura; Hitoshi Morikawa
  Scientific Reports, Volume：13, Number：4914, Mar. 2023, [Reviewed], [Corresponding]
  Abstract
  
  Maize is the world's most produced cereal crop, and the selection of maize cultivars with a high stem elastic modulus is an effective method to prevent cereal crop lodging. We developed an ultra-compact sensor array inspired by earthquake engineering and proposed a method for the high-throughput evaluation of the elastic modulus of maize cultivars. A natural vibration analysis based on the obtained Young’s modulus using finite element analysis (FEA) was performed and compared with the experimental results, which showed that the estimated Young’s modulus is representative of the individual Young’s modulus. FEA also showed the hotspot where the stalk was most deformed when the corn was vibrated by wind. The six tested cultivars were divided into two phenotypic groups based on the position and number of hotspots. In this study, we proposed a non-destructive high-throughput phenotyping technique for estimating the modulus of elasticity of maize stalks and successfully visualized which parts of the stalks should be improved for specific cultivars to prevent lodging.
  Springer Science and Business Media LLC, English, Scientific journal
  DOI：https://doi.org/10.1038/s41598-023-32130-5
  DOI ID：10.1038/s41598-023-32130-5, eISSN：2045-2322, 共同研究・競争的資金等ID：39698416;39698422;27335319
• Time‐average stochastic control based on a singular local Lévy model for environmental project planning under habit formation
  Hidekazu Yoshioka; Motoh Tsujimura; Kunihiko Hamagami; Haruka Tomobe
  Mathematical Methods in the Applied Sciences, Mar. 2023, [Reviewed]
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/mma.9140
  DOI ID：10.1002/mma.9140, ISSN：0170-4214, eISSN：1099-1476
• A Non-local Fokker-Planck Equation with Application to Probabilistic Evaluation of Sediment Replenishment Projects
  Hidekazu Yoshioka; Kunihiko Hamagami; Haruka Tomobe
  Methodology and Computing in Applied Probability, Volume：25, Number：1, Feb. 2023, [Reviewed]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s11009-023-10006-5
  DOI ID：10.1007/s11009-023-10006-5, ISSN：1387-5841, eISSN：1573-7713
• An Energy-based Overset Finite Element Method for Pseudo-static Structural Analysis
  Haruka Tomobe; Vikas Sharma; Harusato Kimura; Hitoshi Morikawa
  Journal of Scientific Computing, Volume：94, Number：3, Jan. 2023, [Reviewed], [Lead, Corresponding], ［International magazine］
  Abstract
  
  This paper addresses a simple energy-based overset finite element method (EbO-FEM) to solve pseudo-static deformation problems consisting of overlapped meshes based on the domain composition method (DCM). This scheme is a non-iterative equation-based method for enforcing the continuity of the displacement field. Hence, the scheme consumes possible minimal computational costs for deformation problems with non-conforming overlapping meshes. The system’s total energy is augmented with continuity constraint energy (CCE) which is a function of the gaps in the displacement field between two overlapping regions. Subsequently, two conventional integration schemes, the Gauss-point projection, and the point-to-point projection, are utilized to discretize the CCE. It is confirmed that both schemes can yield accurate and unique solutions in the overlapped region of the finite element meshes. Further, we proposed a dimensionless relative penalty parameter (DRP). We found that DRP ranging between 1 to 10 is appropriate to robustly obtain accurate solutions for a wide range of scales, stiffness, and geometries, which is supported by three numerical simulations without increasing computational costs after assembling the global matrices and vectors.
  Springer Science and Business Media LLC, English, Scientific journal
  DOI：https://doi.org/10.1007/s10915-023-02113-9
  DOI ID：10.1007/s10915-023-02113-9, ISSN：0885-7474, eISSN：1573-7691, 共同研究・競争的資金等ID：39698416
• A Complete Solution to a Long-Run Sand Augmentation Problem Under Uncertainty　　　　　　　　　　　　　　　
  Hidekazu Yoshioka; Haruka Tomobe
  Smart Innovation, Systems and Technologies, Volume：292, First page：127, Last page：133, 2022, [Reviewed]
  International conference proceedings
  DOI：https://doi.org/10.1007/978-981-19-0836-1_10
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85134296562&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85134296562&origin=inward
  DOI ID：10.1007/978-981-19-0836-1_10, ISSN：2190-3018, eISSN：2190-3026, SCOPUS ID：85134296562
• A Mohr-Coulomb-Vilar model for constitutive relationship in root-soil interface under changing suction　　　　　　　　　　　　　　　
  Haruka Tomobe; Kazunori Fujisawa; Akira Murakami
  Soils and Foundations, Volume：61, Number：3, First page：815, Last page：835, Jun. 2021, [Reviewed], [Lead, Corresponding]
  English, Scientific journal
  DOI：https://doi.org/10.1016/j.sandf.2021.03.005
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106622637&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85106622637&origin=inward
  DOI ID：10.1016/j.sandf.2021.03.005, ISSN：0038-0806, SCOPUS ID：85106622637
• Experiments and FE-analysis of 2-D root-soil contact problems based on node-to-segment approach　　　　　　　　　　　　　　　
  Haruka Tomobe; Kazunori Fujisawa; Akira Murakami
  Soils and Foundations, Volume：59, Number：6, First page：1860, Last page：1874, Dec. 2019, [Reviewed], [Lead, Corresponding]
  Scientific journal
  DOI：https://doi.org/10.1016/j.sandf.2019.08.003
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85075339242&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85075339242&origin=inward
  DOI ID：10.1016/j.sandf.2019.08.003, ISSN：0038-0806, SCOPUS ID：85075339242
• サクション制御下における抜根試験および根-土接触解析　　　　　　　　　　　　　　　
  友部 遼; 藤澤 和謙; 村上 章
  Volume：86, Number：7, First page：603, Last page：606, Jul. 2018, [Lead]
  Japanese, Scientific journal
  DOI：https://doi.org/10.11408/jjsidre.86.7_603
  DOI ID：10.11408/jjsidre.86.7_603, 共同研究・競争的資金等ID：27335319
• Estimation of Reinforced Shear Strength by Wheat Root System using Direct Shear Tests　　　　　　　　　　　　　　　
  Tomobe Haruka; Murakami Akira
  Journal of Crop Research, Volume：61, Number：0, First page：33, Last page：39, 2016, [Reviewed], [Lead, Corresponding]
  It is important to understand the shear strength of rooted soil to estimate root lodging of crop plants. The shear strength of soil is expressed by the cohesion and friction coefficients, which are called the strength coefficients. The direct shear test is one of the simple procedures for measuring the strength coefficients. Strength coefficients are understood as the sum of the strength coefficients of the soil and the reinforcement of the roots. There have been few studies done on the strength coefficients of rooted soil which includes the roots of cereals and the reinforcement of the roots of cereals. In this paper, we attempted to conduct direct shear tests using rooted soils which comprise the roots of wheat under different water contents and different mixing amounts of roots in order to understand the shear strength of rooted soils which contain the roots of cereals. In the measurements, the rooted soils and the soils without stump were sampled from the same cultivated field. The water content of the samples was adjusted before conducting the direct shear tests. As a result, the accuracy of the strength coefficients was low for the samples which included pieces of wheat stumps. In contrast, the accuracy of the strength coefficients was high for the samples absent of any pieces of stump under any water or root content conditions. In addition, the effect of shear reinforcement against cohesion was mainly confirmed. It was confirmed at 10~25 kPa under a moisture weight percentage of 18%; however, it was hardly confirmed under a percentage of 24~28%.
  The Society of Crop Science and Breeding in Kinki, Japan, Japanese
  DOI：https://doi.org/10.18964/jcr.61.0_33
  DOI ID：10.18964/jcr.61.0_33, ISSN：1882-885X, J-Global ID：201602279497935381, CiNii Articles ID：130006900265, CiNii Books ID：AA12344964
• Shear Tests and Modeling of Root-Soil Contact Interface by Using Novel Pullout Test　　　　　　　　　　　　　　　
  TOMOBE Haruka; FUJISAWA Kazunori; MURAKAMI Akira
  Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, Volume：84, Number：3, First page：I_223, Last page：I_232, 2016, [Reviewed], [Lead, Corresponding]
  Rooted soils can prevent plants from lodging by supporting the above-ground parts of the plants in cultivated land areas. They can also enhance the stability of natural slopes and soil structures. Understanding the fundamental mechanical behavior of the root-soil interface is necessary for predicting the behavior of rooted soils. To this end, an apparatus for measuring the shear strength on the root-soil interface was developed and applied to three combinations of root-soil materials, namely, steel-silica sand, balsa-silica sand, and barley root-paddy soil. The test results have revealed that the Coulomb criterion is well applicable to the interfacial shear strength in the above three combinations. The results are interpreted in terms of contact mechanics and the modeling of the interfacial shear behavior provides a constitutive equation to describe the relationship between the shear stress and the displacement on the root-soil interface.
  The Japanese Society of Irrigation, Drainage and Rural Engineering, Japanese
  DOI：https://doi.org/10.11408/jsidre.84.I_223
  DOI ID：10.11408/jsidre.84.I_223, ISSN：1882-2789, J-Global ID：201702282548791638, CiNii Articles ID：130005165238, CiNii Books ID：AA12240517
• Collection of the Wild Soybean (Glycine max (L.) Merr. ssp. soja) along the Yodo River in southern Kyoto Prefecture and northern Osaka Prefecture　　　　　　　　　　　　　　　
  友部 遼
  Volume：29, First page：127, Last page：133, 2012, [Reviewed], [Lead, Corresponding]
  Japanese
  ISSN：0915-602X, J-Global ID：201402239353834414, CiNii Articles ID：40020034921, CiNii Books ID：AN10577351

• A method for estimating Young's modulus of maize stalks using torsional vibration mode　　　　　　　　　　　　　　　
  Haruka Tomobe; Taiken Nakashima; Yuri Harasawa; Takumi Morigaki; Yoichiro Kato
  UK Plant Biomechanics Conference 2025, First page：24, Mar. 2025, [Lead, Corresponding]
  English, Summary international conference
  共同研究・競争的資金等ID：42659165;39698416
• A fundamental study on the application of energy- based overset nite element method to dynamic analysis
  友部 遼
  Volume：-, 2023, ［Internationally co-authored］
• plantFEM: A Numerical Platform for Multi-physical Simulation of Plants　　　　　　　　　　　　　　　
  Haruka Tomobe; Yu Tanaka; Tomoya Watanabe
  Third International Workshop on Machine Learning for Cyber-Agricultural Systems (MLCAS2021), Number：22, Nov. 2021, [Lead]
  English, Summary international conference
  共同研究・競争的資金等ID：35670244
• Numerical Computation of Measure-Valued Solutions to a Hyperbolic Fokker-Planck Equation Subject to Nonlocal Boundary Conditions　　　　　　　　　　　　　　　
  Hidekazu Yoshioka; Kunihiko Hamagami; Haruka Tomobe
  International Conference on Applied Mathematics in Engineering (ICAME), First page：52, Last page：52, Sep. 2021
  English, Summary international conference
  共同研究・競争的資金等ID：35670244
• Structural analysis of plant roots based on penetration criterion and finite element analysis　　　　　　　　　　　　　　　
  友部遼; 津川暁; 吉田祐樹; 出村拓; 澤進一郎
  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM), Volume：2021, First page：20411, Last page：20411, Sep. 2021
  Summary national conference
  ISSN：1883-9363, J-Global ID：202202256887508947
• A mechanical criterion for root-penetration into soil based on root-soil mechanics　　　　　　　　　　　　　　　
  友部遼; 津川暁; 吉田祐樹; 有田哲矢; 久保稔; 出村拓; 澤進一郎
  日本植物生理学会年会(Web), Volume：62nd, 2021
  J-Global ID：202102227365074132
• Development of a Finite Element Mesh Generation Algorithm Based on Crop Survey Standard　　　　　　　　　　　　　　　
  友部遼; 渡邊智也; 田中佑
  日本作物学会講演会要旨集, Volume：251st, 2021
  J-Global ID：202102258751732059
• Numerical simulation for pull-out behavior of roots based on Mohr-Coulomb-Vilar model　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  地盤工学研究発表会発表講演集(Web), Volume：55th, 2020
  J-Global ID：202102280619315887
• 2-D Numerical Simulation of Unsaturated Pull-out Tests Based on Mohr-Coulomb-Vilar Model　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  農業農村工学会大会講演会講演要旨集(CD-ROM), Volume：2019, 2019
  J-Global ID：202002212783192794
• 2-D Numerical Simulations of Contact Interfaces Between Roots and Soils by Using Stabilized Node-To-Segment Scheme　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  計算工学講演会論文集(CD-ROM), Volume：23, First page：4p, Jun. 2018
  Japanese
  ISSN：1342-145X, J-Global ID：201802231798606132, CiNii Articles ID：40021577085
• 安定化NTS法を用いた根-土接触解析　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：53rd, 2018
  J-Global ID：201802213013269251
• 安定化NTS法による抜根試験の再現シミュレーション　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：2018, 2018
  J-Global ID：201902231802784545
• Shear tests and modeling of root-soil contact interface using novel pullout test　　　　　　　　　　　　　　　
  Haruka Tomobe; Kazunori Fujisawa; Akira Murakami
  The 15th International Conference of the International Association for Computer Methods and Advances in Geomechanics, Oct. 2017, [Lead]
  English, Summary international conference
  共同研究・競争的資金等ID：27335319
• A Numerical Simulation of Root-Soil Contact Interface Based on the Computational Contact Mechanics　　　　　　　　　　　　　　　
  友部 遼; 藤澤 和謙; 村上 章
  Volume：22, First page：5p, May 2017
  Japanese
  ISSN：1342-145X, J-Global ID：201702294948474523, CiNii Articles ID：40021224884
• 根-土接触面の強度特性の把握および数値解析　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：52nd, 2017
  J-Global ID：201702251868953364
• 有限変形弾塑性有限要素法による根-土接触シミュレーション　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：74th, 2017
  J-Global ID：201802251957433808
• 根-土接触計算コードの開発とベンチマーク計算による検証　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：2017, 2017
  J-Global ID：201802240378650039
• A Numerical Simulation of the Root Lodging of Soybean Based on the Computational Contact Mechanics　　　　　　　　　　　　　　　
  Tomobe Haruka; Fujisawa Kazunori; Murakami Akira
  Abstracts of Meeting of the CSSJ, Volume：244, Number：0, First page：28, Last page：28, 2017
  CROP SCIENCE SOCIETY OF JAPAN, Japanese
  DOI：https://doi.org/10.14829/jcsproc.244.0_28
  DOI ID：10.14829/jcsproc.244.0_28, J-Global ID：201702244581940820, CiNii Articles ID：130006076201
• 箕面森町における大規模盛土工事の施工及び管理　　　　　　　　　　　　　　　
  友部遼
  Volume：64, Number：7, 2016
  ISSN：1882-7276, J-Global ID：201602238385356637
• 計算接触力学に基づく抜根試験の再現シミュレーション　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：73rd, 2016
  J-Global ID：201702219157886363
• 抜根試験機による根-土接触面のせん断挙動の把握及びモデル化　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：2016, 2016
  J-Global ID：201702257916055077
• サクション制御下における根-土境界面のせん断強度試験　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：72nd, 2015
  J-Global ID：201602201779570587
• 根-土境界面におけるせん断挙動に関する実験的研究　　　　　　　　　　　　　　　
  友部遼; 藤澤和謙; 村上章
  Volume：2015, 2015
  J-Global ID：201602214380823869
• 若手の会企画による小集会（15） 「学生・若手研究者の進路選択をサポート ドクナビ！」開催報告　　　　　　　　　　　　　　　
  出口 哲久; 大井 崇生; 岡村 昌樹; 楠元 宏尚; 友部 遼; 廣岡 義博
  Volume：83, Number：2, First page：174, Last page：180, 2014
  Japanese
  DOI：https://doi.org/10.1626/jcs.83.174
  DOI ID：10.1626/jcs.83.174, ISSN：0011-1848, CiNii Articles ID：130004829732, CiNii Books ID：AN00189888
• 若手の会企画による小集会（16） 「みんなでリサーチシェアリング。僕の・私の研究ライフ！」開催報告　　　　　　　　　　　　　　　
  鎌田 英一郎; 亀岡 笑; 棚田 大介; 友部 遼; 庸一 3
  Volume：83, Number：4, First page：382, Last page：382, 2014
  Japanese
  DOI：https://doi.org/10.1626/jcs.83.382
  DOI ID：10.1626/jcs.83.382, ISSN：0011-1848, CiNii Articles ID：130004704849

• ON THE ARBITRARY PRECISION AND THE EXPLICIT TIME INTEGRATION SCHEME FOR SEMI-DISCRETIZED FINITE ELEMENT METHOD BASED USING WAVE KERNEL FUNCTION　　　　　　　　　　　　　　　
  HARUKA TOMOBE; VIKAS SHARMA; HARUSATO KIMURA; HITOSHI MORIKAWA; HIDEKAZU YOSHIOKA; JUN KURIMA; KAZUNORI FUJISAWA
  8th International Conference on Earthquake Geotechnical Engineering (8ICEGE), May 2024, [International conference]
  May 2024 - May 2024, English, Oral presentation
  共同研究・競争的資金等ID：39698416;39698417;35670244
• Non-Destructive High-Throughput Measurement of Elastic Properties of Maize using a Novel Ultra-Micro Sensor Array and Finite Element Analysis　　　　　　　　　　　　　　　
  Haruka Tomobe; Taiken Nakashima; Takumi Morigaki; Mengfan Yang; Hiroto Yamaguchi; Yoichiro Kato; Vikas Sharma; Harusato; Kimura; Hitoshi Morikawa
  ASABE-AIM2023, Jul. 2023
  Jul. 2023 - Jul. 2023, English, Oral presentation
  共同研究・競争的資金等ID：39698416;42659155
• Energy-based overset finite element method for 3-D deformation simulation for plants　　　　　　　　　　　　　　　
  Haruka Tomobe; Vikas Sharma; Harusato Kimura; Hitoshi Morikawa
  The 10th Plant Biomechanics Conference, Aug. 2022
  Aug. 2022 - Aug. 2022, English, Poster presentation
  共同研究・競争的資金等ID：39698416;35670244
• ３次元有限要素解析と常時微動観測に基づく老朽ため池のせん断波速度推定へ向けて　　　　　　　　　　　　　　　
  友部 遼
  Jun. 2022, [Invited]
  Japanese, Public discourse
  共同研究・競争的資金等ID：35670939
• Numerical simulations of photosynthesis for 3-D soybean canopy based on Farquhar model　　　　　　　　　　　　　　　
  Haruka Tomobe; Yu Tanaka
  JpGU, May 2022
  Japanese, Oral presentation
• 数理モデル論文公開後の使用コードのOSS化とその意義　　　　　　　　　　　　　　　
  友部 遼
  Nov. 2021, [Invited]
  Japanese, Public discourse
  共同研究・競争的資金等ID：35670939

• Apr. 2022
  Computers and Fundamental Programming, Tokyo Institute of Technology
• 2022
  (Exercises in fundamentals of progressive data science), Tokyo Institute of Technology
• 2022
  Exercises in fundamentals of data science, Tokyo Institute of Technology
• 2021
  Practice in Surveying, Tokyo Institute of Technology
• 2021
  Concrete and Geotechnical Engineering Laboratory I, Tokyo Institute of Technology
• 2021
  Concrete and Geotechnical Engineering Laboratory II, Tokyo Institute of Technology
• 2021
  Structural Mechanics and Hydraulics Laboratory II, Tokyo Institute of Technology
• 2021
  Integrated Civil and Environmental Engineering Project, Tokyo Institute of Technology
• 2020
  Experiment of soil mechanics, National Institute of Technology, Toyota College
• 2020
  Practice in Surveying, National Institute of Technology, Toyota College
• 2020
  Basis of applied mathematics, National Institute of Technology, Toyota College
• 2018
  Introduction to Linux

• Jul. 2023 - Present, American Society of Agricultural and Biological Engineers
• 2020 - Present
• 2017 - Present
• 2015 - Present

• plantFEM 22.04 LTS　　　　　　　　　　　　　　　
  Haruka Tomobe
  Apr. 2022, [Software]
  共同研究・競争的資金等ID：35670244;27335319;35670939
• plantFEM 21.10　　　　　　　　　　　　　　　
  Haruka Tomobe
  Oct. 2021, [Software]
  共同研究・競争的資金等ID：35670244;27335319;35670939

• 3次元動的植物体-地盤連成解析手法の開発ー植物に学ぶレジリエント農業水利施設へー　　　　　　　　　　　　　　　
  Apr. 2022 - Mar. 2026
  Principal investigator
  Grant amount(Total)：4550000, Direct funding：3500000, Indirect funding：1050000
  Grant number：22K14964
  論文ID：48898746, MISC ID：50082429, 講演・口頭発表等ID：47912380, 受賞ID：44457944, メディア報道ID：42273715
• Crop health monitoring using seismic noize　　　　　　　　　　　　　　　
  JSPS, Jul. 2023 - Mar. 2025
  Coinvestigator
  Grant number：23K18019
  論文ID：48898746, MISC ID：50082429
• 蛍光画像をリアルタイムリンクした三次元サイバーダイズに基づく病虫害予測　　　　　　　　　　　　　　　
  Jun. 2022 - Mar. 2025
  Coinvestigator
  Grant amount(Total)：6500000, Direct funding：5000000, Indirect funding：1500000
  Grant number：22K19221
  講演・口頭発表等ID：42769540
• スパースな地震観測網による地盤-構造物系の地震時挙動の高精度予測手法の開発　　　　　　　　　　　　　　　
  Apr. 2019 - Mar. 2024
  Coinvestigator
  Grant amount(Total)：17030000, Direct funding：13100000, Indirect funding：3930000
  Grant number：19H02400
  論文ID：48898746, 講演・口頭発表等ID：47912380, 受賞ID：44457944
• 歴史地理学と物理数値シミュレーショ ンの融合による，ため池の力学特性デ ータベースの構築　　　　　　　　　　　　　　　
  Oct. 2020 - Mar. 2022
  Principal investigator
  Grant amount(Total)：3650000
  Competitive research funding
  講演・口頭発表等ID：42659303, 受賞ID：44457944, Works(作品等)ID：39580427
• Root-soil-water coupling simulator for numerical simulation of agricultural facility.　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Research Activity Start-up, Sep. 2020 - Mar. 2022
  Tomobe Haruka, Principal investigator
  Grant amount(Total)：2860000, Direct funding：2200000, Indirect funding：660000
  Plant roots hold soil particles in a web-like structure on natural and man-made slopes, thus contributing to slope stabilization. On the other hand, plant roots can also break up hard tillage beds and soften the soil in wastelands and agricultural lands. Both of these effects are positive/negative reinforcing effects of plant roots on the soil. To estimate and utilize the reinforcing effects, it is necessary to mechanically predict and evaluate the process of plant root growth and soil penetration. Through this study, we have developed a mathematical basis for 2-D and 3-D numerical simulations of the growth process of plant roots of arbitrary shapes under various soil moisture conditions, initial stress distributions, and boundary conditions.
  Grant number：20K22599
  論文ID：48898746, MISC ID：37027499, 講演・口頭発表等ID：47912380, 受賞ID：44457944, Works(作品等)ID：39580427
• Prediction of internal erosion at soil-water interface by bridging soil mechanics and hydraulics　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Apr. 2017 - Mar. 2021
  Fujisawa Kazunori, Kyoto University, Coinvestigator
  Grant amount(Total)：18330000, Direct funding：14100000, Indirect funding：4230000
  Soil erosion is a natural phenomenon usually induced by water flows, including overland flow and seepage flow in soils, and is still difficult to be predicted accurately. In order to deal with the natural phenomenon, proper approaches from soil mechanics and hydraulics are required. This research project has attempted an experimental investigation of incipient motion of cohesionless soils under seepage effects and rheology of the soils under very low confining stress assuming the soil surface. In addition to the experimental investigation, a numerical method which can simultaneously simulate (regular) water flow in a fluid domain and seepage flow in a porous medium has been developed. The above achievement has established the basics for the prediction of the soil erosion considering the interaction of water flows inside and outside of soils.
  Grant number：17H03889
  論文ID：41826727
• Development of rooted soil simulator　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows, Grant-in-Aid for JSPS Fellows, Apr. 2017 - Mar. 2020
  Kyoto University, Principal investigator
  Grant amount(Total)：2700000, Direct funding：2700000
  Grant number：17J02383
  論文ID：41826727, MISC ID：35703454, Works(作品等)ID：39580427

• (only Japanese)　　　　　　　　　　　　　　　
  Nikkei Inc., Nikkei Business Daily, 19 May 2023, [Paper]
• 秋田県立大など、植物根部の浮き上がり現象の力学的仕組みを解明　　　　　　　　　　　　　　　
  13 May 2023, [Internet]
  共同研究・競争的資金等ID：39698416
• New method established for selecting corn that does not lodge.　　　　　　　　　　　　　　　
  Kyoto University Press, May 2023, [Paper]
• 倒れにくいトウモロコシ、選抜しやすく 東京工業大など　　　　　　　　　　　　　　　
  Other than myself, https://www.nikkei.com/article/DGXZQOUC286EH0Y3A420C2000000/, 01 May 2023, [Paper]