1,720,958 research outputs found
Development of finite-element and rigid body hybrid human simulation model
Get PDF本研究課題では,剛体リンク動力学モデルと有限要素モデルを統合し,生体の軟部組織と外部環境との接触に起因する変形を考慮することのできる動力学シミュレーションモデルを開発する.研究成果としては,シミュレーションモデルを開発し,足部を弾性体とした2足モデルを用いた動力学シミュレーションを行った.具体的には,足部の有限要素モデルパラメータの同定およびモデルへの導入をしたこと,および動力学シミュレーションモデルの構築と検証したこと,が研究実績である.In this study, a model which integrates rigid link multi-body dynamics model and finite element model will be developed. The model will be able to consider deformation behavior occurred by contact between soft tissue of human body and external body surface. Research outcome of this study is that framework of the simulation model was developed and a forward dynamical simulation of which foot segment is modeled as elastic body was performed.出典：研究課題「有限要素・剛体リンクハイブリッド型身体動力学シミュレーションモデルの開発」課題番号20700462
（KAKEN：科学研究費助成事業データベース（国立情報学研究所））
（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-20700462/20700462seika/）を加工して作成金沢大学理工研究域フロンティア工学系research repor
Mechanism of passive joint moment (PJM) on ankle joint and estimation method of the PJM with ankle movement
Get PDF本研究では，まず，３次元非圧縮超弾性体の接触問題について解析可能な陰解法非線形有限要素ソルバを作成し，剛体力学系モデルと連成した問題を解くことができる枠組みを作った．その上で人体の骨形状CTデータを元にして，足部節および脛骨と腓骨の遠位部の骨格と靭帯について，それぞれを剛体とバネとして表し，骨同士の力学的相互作用を摩擦のない接触として足関節から足部の力学モデルを構築した．立脚期の荷重状態を模擬した際の受動抵抗特性を推定した結果，荷重時の受動抵抗の変化には関節面の形状の影響は無視できないほど大きいという可能性を示した．In this study, we created a framework that consists of solvers of implicit nonlinear finite element method and rigid body dynamics, to analyse coupling problem between deformation behavior of three-dimensional incompressible hyperelastic body and rigid bodies with contact problem. Using the framework, a dynamical model of the foot that consists of ligaments and skeleton, which are represented as springs and rigid bodies, was constructed based on CT data of a human foot. Results of analyses about the passive joint moment during stance phase show the possibility that the shape of the articular surface plays a large role in the passive joint moment especially during stance phase.研究課題/領域番号:23650323, 研究期間(年度):2011-2013出典：研究課題「足関節受動抵抗の発生機序解明とその運動中の値の推定手法の開発」課題番号23650323
（KAKEN：科学研究費助成事業データベース（国立情報学研究所））
（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-23650323/23650323seika/）を加工して作成research repor
Technique for Estimmation of Motion Status and Intension for Prosthesis Users and Development of a New Hip Disarticulation Prosthesis
Get PDF義足は，下肢切断者が歩行する際には必須の道具となり，脚の機能の一部を代償することから身体の一部とも例えられる福祉用具である．本研究課題では，義足の中でも最も高度な技術が必要となる股義足を主な対象として，駆動要素を組み込んだ高機能義足の設計手法を提案し，それを用いて動力股義足を開発した．この際，義足使用者の歩行時の身体ダイナミクスデータを収集するシステムを開発し，過渡的な歩行状態の再現することのできる神経筋骨格歩行シミュレーションモデルを作成し，能動股義足を開発した．Prosthesis is a critical device for lower limb amputee to compensate for part of the function of the leg. In this study, we proposed a design process of high-performance hip disarticulation prosthesis (HDP), for which the most advanced technology is required in the lower limb prostheses, incorporating a driving element, therefore we have developed a power HDP by using the proposed design tool. In this project, we developed a system for collecting body dynamics data of a prosthesis user during walking, constructed a neuromuscular gait simulation model which can reproduce the walking transient state, and developed an active HDP.研究課題/領域番号:22680046, 研究期間(年度):2010-04-01 - 2014-03-31出典：研究課題「義足使用者の運動状態・運動意図推定手法の確立とそれを応用した高機能股義足の開発」課題番号22680046
（KAKEN：科学研究費助成事業データベース（国立情報学研究所））
（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-22680046/22680046seika/）を加工して作成research repor
計算機シミュレーションを援用した義足の適合・設計技術確立のための基礎的研究
Get PDF本研究課題では，義足の適合や設計を支援するシステムの構築を目指し，システムに必要な基盤的技術の開発を行った．主な研究成果は次の3点である．(1) MRI装置および荷重計付き超音波エコー画像装置を用いることで，利用者の断端部組織の3次元立体形状と同時に各組織の弾性分布を推定する手法を開発した．(2) 神経・筋骨格モデルを用いて任意の義足を着用した状態の歩行のシミュレーションし，歩行を評価することができるシステムを構築した．(3) 実際の義足利用者の断端およびソケットを基にした有限要素解析の結果，適合している大腿義足ソケット着用時の断端の応力分布の典型的なパターンを予測した．In this research project, we aimed to construct a system to support the fitting and design of prosthetic legs, and developed the fundamental technologies necessary for the system. The three main research results are as follows. (1) We developed a method for estimating the three-dimensional shape of the patient's tissues of stump and the elastic distribution of each tissue simultaneously by using an MRI device and a US echo imaging system. (2) We developed a calculation system using neuro-musculo-skeletal model which is able to simulate the gait of an arbitrary prosthetic leg and evaluate the gait. (3) Based on finite element analysis of an actual prosthetic leg user's stump and socket, we predicted the typical pattern of stress distribution at the stump of the fitted above knee prosthetic socket wearing standing position.研究課題/領域番号:15H03052, 研究期間(年度):2015-04-01 - 2020-03-31出典：「計算機シミュレーションを援用した義足の適合・設計技術確立のための基礎的研究」研究成果報告書 課題番号15H03052
（KAKEN：科学研究費助成事業データベース（国立情報学研究所））
（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-15H03052/15H03052seika/)を加工して作成金沢大学理工研究域フロンティア工学系research repor
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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