Yu Otake
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View article: Association between thoracic kyphosis and objectively measured sleep efficiency in patients with lumbar spinal stenosis
Association between thoracic kyphosis and objectively measured sleep efficiency in patients with lumbar spinal stenosis Open
Purpose Sleep disorders frequently occur in patients with lumbar spinal stenosis (LSS), but the role of sagittal spinal alignment in these disorders remains unclear. This study aimed to examine the association between sagittal alignment pa…
View article: Tabular foundation model for GEOAI benchmark problems BM/AirportSoilProperties/2/2025
Tabular foundation model for GEOAI benchmark problems BM/AirportSoilProperties/2/2025 Open
This paper presents a novel application of the Tabular Prior-Data Fitted Network (TabPFN) - a transformer-based foundation model for tabular data - to geotechnical site characterization problems defined in the GEOAI benchmark BM/AirportSoi…
View article: Sensitivity Analysis on Critical Combinations of Input Parameters in DEM Granular Flow Analysis
Sensitivity Analysis on Critical Combinations of Input Parameters in DEM Granular Flow Analysis Open
This study aims to capture the critical combinations of key parameter in granular flow simulations using Discrete Element Method (DEM) considering the particle size distribution. For that purpose, XGBoost feature importance is employed to …
View article: Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis
Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis Open
Granular flow is a typical process that occurs in sediment disasters, including rockfalls, avalanches and landslides, etc. The runout distance in granular flow is closely associated with the ultimate impact range of these sediment disaster…
View article: Scenario Superposition Method for Real‐Time Tsunami Prediction Using a Bayesian Approach
Scenario Superposition Method for Real‐Time Tsunami Prediction Using a Bayesian Approach Open
In this study, we propose a scenario superposition method for real‐time tsunami wave prediction. In the offline phase, prior to actual tsunami occurrence, hypothetical tsunami scenarios are created, and their wave data are decomposed into …
View article: Pathway to a fully data-driven geotechnics: Lessons from materials informatics
Pathway to a fully data-driven geotechnics: Lessons from materials informatics Open
This paper elucidates the challenges and opportunities inherent in integrating data-driven methodologies into geotechnics, drawing inspiration from the success of materials informatics. Highlighting the intricacies of soil complexity, hete…
View article: Optimization of a Tsunami Gauge Configuration for Pseudo‐Super‐Resolution of Wave Height Distribution
Optimization of a Tsunami Gauge Configuration for Pseudo‐Super‐Resolution of Wave Height Distribution Open
In this study, we present an optimization method for determining a cost‐effective sparse configuration for tsunami gauges to realize the reconstruction of high‐resolution wave height distribution throughout the target region based on the c…
View article: FUNDAMENTAL STUDY ON SIGNAL RECONSTRUCTION AND FUTURE PREDICTION OF DIFFERENTIAL SETTLEMENT PROCESSES IN AN OFFSHORE AIRPORT USING DYNAMIC MODE DECOMPOSITION
FUNDAMENTAL STUDY ON SIGNAL RECONSTRUCTION AND FUTURE PREDICTION OF DIFFERENTIAL SETTLEMENT PROCESSES IN AN OFFSHORE AIRPORT USING DYNAMIC MODE DECOMPOSITION Open
本研究は,海上空港の盛土構築時の地盤変状の実測記録を詳細に分析し,リアルタイムな将来予測やフィードバック制御の可能性を検討している.地盤変状の実記録には,計器の故障等に起因していると想定される観測誤差やバイアスなどの異質性,欠損が含まれている.従って,実観測記録の信号復元により,上記のような本質的ではない情報を除くことは,データ駆動型の予測や制御を実用化するための重要な観点となる.本論文では,実際の観測記録に対して,動的モード分解 (DMD) に基づいた信号復元手法と地盤変…
View article: Full-Endoscopic Foraminal Decompression for Foraminal Stenosis Following Osteoporotic Vertebral Fracture in an Elderly Woman Under Local Anesthesia:A Case Report
Full-Endoscopic Foraminal Decompression for Foraminal Stenosis Following Osteoporotic Vertebral Fracture in an Elderly Woman Under Local Anesthesia:A Case Report Open
Osteoporotic vertebral fracture (OVF) is common in the elderly population. In this report, we describe a case with radiculopathy due to foraminal stenosis caused by OVF in a very elderly patient that was treated successfully by full-endosc…
View article: DATA-DRIVEN SEISMIC RESPONSE ANALYSIS BASED ON DYNAMIC MODE DECOMPOSITION WITH TIME-DELAY EMBEDDING
DATA-DRIVEN SEISMIC RESPONSE ANALYSIS BASED ON DYNAMIC MODE DECOMPOSITION WITH TIME-DELAY EMBEDDING Open
本研究は, 地表面と工学的基盤において観測される地震動加速度記録の同時学習によるデータ駆動型地震応答解析手法の開発を目的とした基礎研究である. 地震応答解析においては, 入力地震動の非定常性と地盤材料の非線形性への対処が重要な課題となる. そこで, Koopman 作用素理論に基づき, 実空間で観測される時系列データに対して, 時間遅延埋め込みによる高次元化と動的モード分解による次元圧縮を融合した手法を適用し, 高次元空間において線形モデルによる時間発展表現を可能とする地震…
View article: RELIABILITY ASSESSMENT OF MULTIVARIATE SOIL PROPERTIES UNDER OFFSHORE AIRPORT USING LARGE-SCALE GENERIC DATABASE AND HIERARCHICAL BAYESIAN MODEL
RELIABILITY ASSESSMENT OF MULTIVARIATE SOIL PROPERTIES UNDER OFFSHORE AIRPORT USING LARGE-SCALE GENERIC DATABASE AND HIERARCHICAL BAYESIAN MODEL Open
本研究では, 日本の海上空港の軟弱基礎地盤の地盤物性値推定を事例に, 階層ベイズモデル(HBM)を用いて地盤パラメータの推定と土質特性の工学的解釈可能性を検討した.具体的には,世界の地盤調査データ(ジェネリックデータベース,GDB)を利用した単純な HBM と類似度に基づく GDB の絞り込みによる HBM との比較を行った.この検討の中で,地盤工学的知見を活用して土層別に類似度絞り込みを行った HBM は高い推定精度を示し,さらに地盤工学的分類などの力学的解釈性を深めるこ…
View article: A METHOD FOR EVALUATING MATERIAL UNCERTAINTIES IN OVERTOPPING EROSION ANALYSIS OF RIVER LEVEES
A METHOD FOR EVALUATING MATERIAL UNCERTAINTIES IN OVERTOPPING EROSION ANALYSIS OF RIVER LEVEES Open
河川堤防内部の材料物性は築堤履歴に依存して不確実である.また,近年激甚化する降雨を背景に,越流時の堤防の粘り強さの評価手法の確立が求められている.本研究では,河川堤防の越流侵食解析における材料不確実性の評価手法を提案する.実河川堤防の様々な粒度分布に対する近似多数解析を実現し,材料不確実性による越流侵食の影響評価を実現している.本論文では,耐侵食性への粒度分布の影響を考慮した掃流砂および浮遊砂モデルの拡張による解析法の高度化,主成分分析を用いた次元縮減,ガウス過程回帰による…
View article: Future-proofing geotechnics workflows: accelerating problem-solving with large language models
Future-proofing geotechnics workflows: accelerating problem-solving with large language models Open
The integration of Large Language Models (LLMs) like ChatGPT into the workflows of geotechnical engineering has a high potential to transform how the discipline approaches problem-solving and decision-making. This paper delves into the inn…
View article: Pathway to a fully data-driven geotechnics: lessons from materials informatics
Pathway to a fully data-driven geotechnics: lessons from materials informatics Open
This paper elucidates the challenges and opportunities inherent in integrating data-driven methodologies into geotechnics, drawing inspiration from the success of materials informatics. Highlighting the intricacies of soil complexity, hete…
View article: Quantification of the contribution ratio of relevant input parameters on DEM-based granular flow simulations
Quantification of the contribution ratio of relevant input parameters on DEM-based granular flow simulations Open
Granular flow is affected by multiple parameters, which makes its study challenging. The discrete element method (DEM) is widely employed to simulate granular flow in consideration of particle motion, particularly when the effects of relat…
View article: Optimal probabilistic placement of facilities using a surrogate model for 3D tsunami simulations
Optimal probabilistic placement of facilities using a surrogate model for 3D tsunami simulations Open
This study proposes a framework for utilizing results obtained from advanced numerical simulations and performing probabilistic tsunami hazard assessment for investigating optimal facility placement. A set of numerical simulations of the t…
View article: RELIABILITY ASSESSMENT FOR BEARING CAPACITY OF SHALLOW FOUNDATION AFTER SCOURING UNDER LIVE LOAD BY BAYESIAN INFERENCE
RELIABILITY ASSESSMENT FOR BEARING CAPACITY OF SHALLOW FOUNDATION AFTER SCOURING UNDER LIVE LOAD BY BAYESIAN INFERENCE Open
近年の豪雨災害の増加に伴い,戦前に建設された旧式河川橋脚の直接基礎の洗掘被害が増加している.被害が生じても,被災基礎の再供用により応急復旧できる場合もある.早期の応急復旧には,残存支持力の大きさを迅速かつ必要十分な信頼性で評価して再供用の可否を判断する必要がある.これまでに,徐々に非線形化する滑らかな荷重変位関係をワイブル曲線によりモデル化した上で荷重変位関係をベイズ推定する手法が提案されている.この手法は,荷重レベルが小さい範囲での荷重変位関係の観測情報から,未経験の荷重…
View article: PROBABILISTIC PERFORMANCE EVALUATION FOCUSING ON RELATIVE DISPLACEMENT IN THE NORMAL DIRECTION OF SEISMICALLY STRENGTHENED QUAYWALLS AFTER LEVEL 2 EARTHQUAKE
PROBABILISTIC PERFORMANCE EVALUATION FOCUSING ON RELATIVE DISPLACEMENT IN THE NORMAL DIRECTION OF SEISMICALLY STRENGTHENED QUAYWALLS AFTER LEVEL 2 EARTHQUAKE Open
緊急物資の輸送拠点である耐震強化岸壁は,災害発生後においても船舶が接岸できるよう,地震後の岸壁法線の凹凸変位を一定以下に制御する必要がある.しかし,現行の耐震設計では,ある代表的な単一断面における残留変位のみに着目することが一般的であり,凹凸変位は直接的に評価されていない.これは,凹凸変位の評価方法が確立されていないためである.本研究ではまず,既往研究で提案されているROMの線形性という特性を活用することで,必要最小限のケース数を対象とした地震応答解析結果を用いて応答曲面を…