著者
津田 一郎
出版者
一般社団法人日本応用数理学会
雑誌
応用数理 (ISSN:09172270)
巻号頁・発行日
vol.18, no.3, pp.176-193, 2008-09-25

海馬という大脳辺縁系に属する場所はエピソード記憶の形成に必須であると考えられてきた.また,海馬の萎縮がアルツハイマー病を導く可能性も指摘された.アルツハイマー病を起こさない,あるいはリハビリの過程で海馬における記憶形成の機構をシステムレベルで知ることは意義のあることだろう.講演では,海馬CA3の数理モデルが創発するカオス的なダイナミックスのもとで記憶の連続想起を説明することを示し,海馬CA1の数理モデルがCA3からの時系列出力をカントール集合上に表現することを示した.CA3のカオスダイナミックスは我々が提唱しているカオス的遍歴とみなされる.CA1での情報表現をカントールコーディングと呼んでいる.また,この情報はデコードできることも示す.モデルの結果を仮説としてまとめ,それらを確認する実験が行われ,部分的に実証されたことも報告する.
著者
富安(大石) 亮子
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.26, no.3, pp.4-16, 2016 (Released:2016-12-26)
参考文献数
23

When P ⊂ ℝ3 is a periodic point set with the period lattice L, an efficient method to determine the quadratic form of L ⊂ ℝ3 (more precisely, its equivalence class over ℤ.) from the average theta series of P has a practical application to the problem known as “powder indexing” in crystallography. By using “topographs” defined in the reduction theory of quadratic forms, we succeeded in developing an algorithm robust against loss and errors of information due to observational problems, suppressing the computation time. We introduce how the topographs were used in the method.
著者
西尾 敦
出版者
一般社団法人日本応用数理学会
雑誌
応用数理 (ISSN:09172270)
巻号頁・発行日
vol.3, no.3, pp.242-246, 1993-09-16
著者
浦川 肇
出版者
日本応用数理学会
雑誌
応用数理 (ISSN:09172270)
巻号頁・発行日
vol.12, no.1, pp.29-45, 2002
参考文献数
48
被引用文献数
1

科研費報告書収録論文(課題番号:13440051・基盤研究(B)(2) ・H13~H15/研究代表者:浦川, 肇/無限グラフの熱核,グリーン核の大域解析 )
著者
鈴木 寿
出版者
一般社団法人日本応用数理学会
雑誌
応用数理 (ISSN:09172270)
巻号頁・発行日
vol.9, no.3, pp.207-219, 1999-09-16
被引用文献数
2

This article compactly describes progress of researches on the Hough transform that is famous as one of straight-line detection methods in fields of image processing. Many versions revised from the original Hough transform have been developed, and the generalized Hough transform can detect not only straight lines but also figures of arbitrary shapes. An important problem in grayscale image processing is to calculate the ratio of magnification, the angle of rotation, and the quantity of parallel translation between a template image and its varied, noisy image. Known solutions for this problem can be classified to characteristic point extracting methods, normalized correlatiom methods, moment methods, frequency space methods, energy minimization methods, θ-p Hough transform methods, generalized Hough transform methods, and others. Generalized Hough transform methods are robust even if the quality of images is low; nevertheless, practical applications were difficult since their computational complexity is not small. Various methods based on the Hough transform are realizable and practical today since computers have been highly advanced.
著者
園田 翔
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.33, no.1, pp.4-13, 2023-03-24 (Released:2023-06-30)
参考文献数
30

Characterization of the typical deep learning solutions is crucial to understanding and controlling deep learning. Due to the complex structure of real deep neural networks (NNs), various simplified mathematical models are employed in conventional theoretical analysis. In this study, we describe a mathematical model of a single hidden layer in an NN, which is an integral representation of NNs, and its right inverse operator (or analysis operator), the ridgelet transform. Furthermore, while the classical ridgelet transform was obtained heuristically, we had recently developed a natural technique to derive it. As an application, we succeeded in developing an NN on manifolds (noncompact symmetric spaces) and deriving the associated ridgelet transform.
著者
額田 彰
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.20, no.2, pp.125-131, 2010-06-25 (Released:2017-04-08)
参考文献数
6

Latest GPUs have not only high computation power but also high memory bandwidth required to accelerate memory intensive computations like FFT. This paper presents a high performance FFT library for CUDA GPUs. It is important to use auto-tuning to exploit the best performance. As a result, the library achieved much higher than other existing libraries.
著者
高橋 大輔
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.23, no.1, pp.35-38, 2013-03-26 (Released:2017-04-08)
参考文献数
5
著者
鈴木 大慈
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.27, no.3, pp.7-14, 2017-09-26 (Released:2017-12-26)
参考文献数
26

Low rank tensor estimation has a lot of applications such as recommendation system, spatiotemporal data analysis, and multi-task learning. We consider a Bayes estimator for this problem. We give theoretical analyses for the Bayes estimator and show that the Bayes estimator achieves the minimax optimal predictive accuracy. We also consider a nonparametric tensor model and a Bayes estimator for that model. It is also shown that the Bayes estimator of the nonparametric model achieves the minimax optimality. Finally, numerical experiments were conducted on restaurant evaluation data and give comparison with the Bayes estimators and other methods.
著者
吉川 周二
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.30, no.2, pp.2-9, 2020-06-24 (Released:2020-09-30)
参考文献数
9

The energy method to derive various properties of the solution from its energy-structure of the equations is one of the classical methods for partial differential equations. When the numerical scheme also possesses the energy-structure, the energy method can be applied to the scheme in the same way. In this article we introduce an application of energy method for the structure-preserving finite difference schemes through proofs of the existence of the solution and error estimate.
著者
古賀 弘樹
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.8, no.2, pp.152-155, 1998-06-15 (Released:2017-04-08)
参考文献数
2