Search Results 1-20 of 6227

  • The Effects of Logarithmic Spiral in Art Works  [in Japanese]

    吉田 美穗子

    図形を回転するとその軌跡は円となるが、等しい倍率で拡大もしくは縮小しながら回転するとその軌跡は螺旋となる。正方形の黄金比を用いた回転を基本として様々な分数の正多角形の外心を中心としてその外角の角度分を、黄金比率の割合で拡大しながら回転させてその軌跡の円弧を繋げていった結果、黄金角である約137.5°に近い外角を持ち、分母・分子が1つ飛びのフィボナッチ数で現わされる正8/3角形、正13/5角形が最も …

    梅花女子大学文化表現学部紀要 = Baika Women's University Faculty of Cultural and Expression Studies Bulletin (17), 112-122, 2021-03-20

    IR  DOI 

  • Postoperative Acute Kidney Injury Associated with Anesthesia Induction in Extremely Hypertensive Patients Undergoing Elective Non-Cardiac Surgery

    Morozumi Kohei , Satomoto Maiko , Hanai Yuki , Ochiai Ryoichi , Kotake Yoshifumi

    … Original ArticleIntroduction: On the basis of the self-similarity of the human body, fractal dimensions can be calculated mathematically. … Fractal analysis can also quantitatively express the density and complexity of a structure as a fractal dimension. … We hypothesize that the fractal dimensions of ultrasonographic findings would change in thyroid disease. …

    Toho Journal of Medicine 7(1), 20-28, 2021-03-01

    IR  DOI 

  • Fractal Geometry-Based Automatic Generation of Large-Scale Image Database for Pre-Training in 3D Object Recognition  [in Japanese]

    YAMADA Ryosuke , OKAYASU Kazushige , NAKAMURA Akio , KATAOKA Hirokatsu

    … We adopt fractal geometry to represent the principles and build the Fractal Data Base random search (FractalDBrs). … We have verified the effectiveness of the proposed fractal geometry-based image database for pre-training in 3D object recognition.</p> …

    Journal of the Japan Society for Precision Engineering 87(4), 374-379, 2021

    J-STAGE 

  • Improvement of the Water Absorbency of Softener-treated Fabric: Addition of a New Hydrophilic Surface

    Igarashi Takako , Nakamura Koichi

    … Inspired by the theory of fractal geometry and the combination of models/equations by Cassie, Baxter, and Wenzel, the idea of adding new convex hydrophilic domains onto the surface of cotton fibers along with the softening agent was conceived. …

    Journal of Oleo Science 70(4), 509-519, 2021

    J-STAGE 

  • Fractal Analysis of Textures of Jomon Pottery and Yayoi Pottery  [in Japanese]

    Maekawa Tadao , Nishina Emi , Kawai Norie , Oomura Rikka , Honda Manabu , Oohashi Tsutomu

    … <p>Abstract: Local exponents of fractal dimension were calculated for photos of Jomon potteries and Yayoi potteries by using the box-counting method. … The local exponents of fractal dimension of Jomon potteries showed stably higher values above 2.65. …

    Transactions of the Virtual Reality Society of Japan 26(1), 72-75, 2021

    J-STAGE 

  • THE EVALUATION ON PETROGY AND CRACKING IN ASR-DERERIORATED COCRETE FOUNDATIONS IN ROAD BRIDGES  [in Japanese]

    NOMURA Masahiro , HIRANO Seishi , GAKE Koki , TORII Kazuyuki

    <p>本論文は道路橋フーチングと水環境が異なる2つのケーソンの基礎構造について、アルカリシリカ反応におけるひび割れを比較検討した。また、1m~2.5mの比較的長いコアを採取し、断片試料および薄片試料を作製してアルカリシリカ反応の劣化度を岩石学的にかつ深さごとに評価した。さらに目視点検による判定向上のため、構造物および断片試料のひび割れからフラクタル次元を算出し、アルカリシリカ反応におけ …

    Cement Science and Concrete Technology 74(1), 155-162, 2021

    J-STAGE 

  • A Toy Model Approach to Fractal Nature: Thermodynamics on a Cantor-Lattice Ising Model

    Hashizume Yoichiro , Sugimoto Takanori

    … <p>Thermodynamics on a Cantor-lattice Ising model is studied to clarify effects of fractal structure. … Exact solutions based on the transfer matrix are investigated for finite size systems, and it is found that there is non-trivial relationship between entropy and fractal structure. … The results suggest a possibility of residual entropy due to the competition between non-uniformity of the fractal structure and uniform external field. …

    MATERIALS TRANSACTIONS 62(3), 374-379, 2021

    J-STAGE 

  • The Study on the Quantification of Re-crystallized Structure Growth in FGHAZ of Mod. 9Cr-1Mo Steel during Creep by Fractal Dimension of Grain Boundaries  [in Japanese]

    KAWASHIMA Fumiko , NISHIMURA Tatsuya , HAMASAKI Kazuki , OKADO Ryotaro , TABU Kanta , TOKUNAGA Takahiro , HAYASHI Yusuke , FUJIWARA Kazuhito

    … The grain boundaries are the fractal and their complexity are expressed with the fractal dimension. … We studied on the method that measured the creep damage in FGHAZ with the fractal dimension. … Before the fracture they were observed with SEM and their fractal dimension were measured with the box-counting methods. … The fractal dimension decreased with creep damage. …

    Journal of the Society of Materials Science, Japan 70(2), 154-161, 2021

    J-STAGE 

  • Effects of pressure and heat loss on the unstable motion of cellular-flame fronts caused by intrinsic instability in hydrogen-air lean premixed flames

    KADOWAKI Satoshi , Aung Thwe Thwe , FURUYAMA Taisei , KAWATA Kazumasa , KATSUMI Toshiyuki , KOBAYASHI Hideaki

    … Moreover, we estimated the fractal dimension of flame fronts through the box counting method. … As the pressure and heat loss increased, the fractal dimension became larger, which denoted that the flame shape became more complicated.</p> …

    Journal of Thermal Science and Technology 16(2), JTST0021-JTST0021, 2021

    J-STAGE 

  • Premixed Flames : Hydrodynamic Instability and Fractal Dimension  [in Japanese]

    桑名 一徳

    実験力学 : Journal of JSEM : Journal of the Japan Society for Experimental Mechanics 20(4), 292-294, 2020-12

  • Theoretical Considerations of Fractal Psychology : Focusing on Comparative Considerations between Previous Research and Fractal Psychology  [in Japanese]

    加藤 雄士 , Yuji Kato

    ビジネス&アカウンティングレビュー = Business & accounting review (26), 25-49, 2020-12

    IR 

  • Multifractal formalism for generalised local dimension spectra of Gibbs measures on the real line

    Jaerisch Johannes , Sumi Hiroki

    … This allows us to investigate the Hölder regularity of various fractal functions, such as distribution functions and conjugacy maps associated with conformal iterated function systems.ファイル公開:2022-11-15 …

    Journal of Mathematical Analysis and Applications 491(2), 124246, 2020-11-15

    IR 

  • On the Sensibility Measurement of High-Resolution Sounds based on EEG Fractal Analyses  [in Japanese]

    中川 匡弘

    回路とシステムワークショップ論文集 Workshop on Circuits and Systems 33, 17-22, 2020-11-07

  • Light extinction and scattering from aggregates composed of submicron particles

    Llorenç Cremonesi , Chloé Minnai , Fabio Ferri , Alberto Parola , Bruno Paroli , Tiziano Sanvito , Marco A. C. Potenza

    … The model can be tightly compared to measurements with single particle extinction and scattering and spectrophotometry and suggests a simple behavior for 90° scattering from fractal aggregates as a function of extinction, which is also confirmed experimentally and numerically. …

    Journal of Nanoparticle Research 22(11), 344, 2020-11-06

    IR 

  • Introduction of Fractal Dimension Feature and Reduction of Calculation Amount in Person Authentication Using Evoked EEG by Ultrasound

    Kotaro Mukai , Nakanishi Isao

    … In this paper, we introduce a new type of feature, namely fractal dimension, as a nonlinear feature, and evaluate its verification performance on its own and in combination with other conventional features. …

    Proceedings of the 2020 IEEE Region 10 Conference (TENCON2020), 2020-11

    IR 

  • Bifractal nature of chromosome contact maps

    Simone Pigolotti , Mogens H. Jensen , Yinxiu Zhan , Guido Tiana

    … Our analysis reveals that Hi-C maps are bifractal, i.e., complex geometrical objects characterized by two distinct fractal dimensions. …

    Physical Review Research 2(4), 043078, 2020-10-15

    IR 

  • Fractal mechanism of basin of attraction in passive dynamic walking

    Okamoto Kota , Aoi Shinya , Obayashi Ippei , Kokubu Hiroshi , Senda Kei , Tsuchiya Kazuo

    … However, the basin of attraction is very small and thin and has a fractal-like complicated shape, which makes producing stable walking difficult. … In our previous study, we used the simplest walking model and investigated the fractal-like basin of attraction based on dynamical systems theory by focusing on the hybrid dynamics of the model composed of the continuous dynamics with saddle hyperbolicity and the discontinuous dynamics caused by the impact upon foot contact. …

    Bioinspiration & Biomimetics 15(5), 2020-09

    IR 

  • Versatile gold-polymer nanointerfaces probed by GISAXS

    Murtaza Bohra , Arun Showry Bandaru , Panagiotis Grammatikopoulos , Vidyadhar Singh

    … GISAXS provided an improved analytic scheme for the buried surface in free-standing 2D gold-polymer nanosheets (with 19% porosity) revealing their fractal structure (Porod slope: -1.71). …

    Materials Today Chemistry (17), 100297, 2020-07-01

    IR 

  • Mechanism of fractal formation in the contour of epithelial monolayer  [in Japanese]

    小熊 俊輝 , 今村 寿子 , 三浦 岳

    数理解析研究所講究録 (2166), 27-31, 2020-07

  • Mechanism of fractal formation in the contour of epithelial monolayer (Theory of Biomathematics and Its Applications XVI -Toward quantitative understanding for life Sciences-)  [in Japanese]

    小熊 俊輝 , 今村 寿子 , 三浦 岳

    MDCK細胞を2次元培養すると, 細胞接着を介しシート構造を形成する. このシート構造の界面の時間変化を観察すると, どの時間においても自己アフィンフラクタル構造を形成し, かつ界面全体の荒さも時間に対してスケールする, 「動的スケーリング則」が成立していた. この性質がどのような仕組みで形 成されているのかを確かめるため界面付近の細胞運動を観察したところ, 界面上にはLeader細胞と呼ばれる運 …

    数理解析研究所講究録 = RIMS Kokyuroku (2166), 27-31, 2020-07

    IR 

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