著者
杉原 厚吉
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.1, no.4, pp.280-299, 1991-12-16 (Released:2017-04-08)
被引用文献数
1

New approaches are presented to the problem of topological inconsistency caused by geometric algorithms implemented in finite-precision arithmetic. In geometric computation numerical errors often create inconsistency in topological structures and thus cause theoretically correct algorithms to fail. To overcome this problem two approaches are considered for the case of constructing the Voronoi diagram as an example. In the first approach, higher-precision arithmetic is used to construct a closed world in which topological structures are judged always precisely, and the symbolic perturbation technique is employed to avoid complicated branches of processing for degenerate cases. In the second approach, the highest priority is placed on the maintenance of topological consistency and numerical results are used as lower-priority information; the resultant algorithm is robust in the sense that inconsistency never arises and is correct in the sense that the output converges to the true solution as the precision becomes higher.
著者
蔵本 由紀
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.17, no.2, pp.175-177, 2007-06-26 (Released:2017-04-08)
参考文献数
4
被引用文献数
1
著者
松川 剛久 三谷 純
出版者
一般社団法人 日本応用数理学会
雑誌
日本応用数理学会論文誌 (ISSN:24240982)
巻号頁・発行日
vol.27, no.4, pp.333-353, 2017 (Released:2017-12-25)
参考文献数
58
被引用文献数
1

概要. 折り紙の幾何学的な性質は古くから研究の対象とされてきた.近年では「計算折り紙」という言葉も誕生し,計算機を用いた研究や工学分野への応用についても活発に議論されている.本稿では折り紙の数理に関して平坦折りの研究についてまとめるとともに,それに関係する計算量および設計手法について紹介する.また,立体折り紙と剛体折り紙という,折り紙の数理の応用において重要な分野についても概説する.
著者
石田 祥子 萩原 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:24321982)
巻号頁・発行日
vol.26, no.1, pp.15-21, 2016 (Released:2016-07-27)
参考文献数
23

Conformal maps are applied for designing foldable forms. This method is able to produce the complicated developed patterns for the geometrical forms such as cones, disks, and tori with different main curvatures from the simple developed patterns for cylinders that are already known, based on the similarity of the quadrilateral elements that determine regular fold lines.
著者
齊藤 宣一
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.19, no.4, pp.281-290, 2009-12-24 (Released:2017-04-08)
参考文献数
15

We are concerned with numerical methods for the Keller-Segel system that describes the aggregation of slime molds resulting from their chemotactic features. Whereas the system has positivity and mass conservation properties, it is not certain that numerical schemes for the system preserve these conservation properties. In the present article, we review two conservative numerical schemes proposed by the author and discuss how to choose the time increments and the space meshes in order to realize those conservation properties. The first one is the finite-difference method that makes use of the semi-implicit time discretization with the time-increment control and the upwind difference approximation. The second is the finite-element method that is an application of Baba-Tabata's conservative upwind finite element. Conservative properties are proved via the theory of M-matrices. Error analysis of the finite-element scheme is also summarized. In particular, we have error estimates with explicit convergence rates by virtue of the analytical semigroup theory.
著者
小西 貞則
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.10, no.3, pp.198-217, 2000-09-17 (Released:2017-04-08)
参考文献数
63

The problem of evaluating the goodness of statistical models is fundamental and of importance in various fields of statistics, natural sciences, neural networks, engineering, economics, etc. Akaike's . information criterion, known as AIC, provides a useful tool for constructing statistical models, and a number of successful applications of AIC in statistical data analysis have been reported. AIC is a criterion for evaluating the models estimated by the maximum likelihood method. With the development of various non-linear modeling techniques, the construction of criteria which enable us to evaluate various types of statistical models has been required. The aim of this paper is to give a systematic account of some recent developments in model evaluation criteria from information-theoretic and Bayesian points of views. We intend to provide a basic expository account of the fundamental principles behind information criteria. We also discuss the application of the bootstrap methods in model evaluation problems.
著者
手塚 集
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.4, pp.267-276, 1998-12-15 (Released:2017-04-08)
参考文献数
13
被引用文献数
1

This paper surveys recent developments on numerical algorithms for high dimensional multiple integration. First, we present Wozniakowski's theorem published in 1991, which revealed a remarkable connection between the integration error and the discrepancy via the classical Wiener measure. Then, we introduce low-discrepancy sequences, by means of which one can compute the arithmetic mean of a number of sample values of the integrand as an approximation to the integration. As a concrete construction method of low-discrepancy sequences, we give the definition of generalized Niederreiter sequences and a brief introduction of Niederreiter-Xing sequences, which are constructed by using algebraic function fields. Finally, we describe Smolyak's algorithm, which is an algorithm computing the weighted mean of sample values of the integrand. Sample points that this algorithm uses are called hyperbolic cross points. An interesting result by Wasilkowski and Wozniakowski on this algorithm is presented.
著者
西森 拓 西村 信一郎
出版者
一般社団法人 日本応用数理学会
雑誌
応用数理 (ISSN:24321982)
巻号頁・発行日
vol.24, no.2, pp.59-65, 2014-06-25 (Released:2017-04-08)
被引用文献数
1

Foraging efficiency of ant colony is studied along the idea of strategy of errors. Strategy of errors is a seemingly-paradoxical group-tactics proposed by Deneubourg, meaning that errors of individual ants in following trail pheromone, rather, increase the efficiency of pheromone-mediated group foraging. In this paper, we first explain the basic idea of strategy of errors, thereafter, extend Deneubourg's original model to entrain more realistic processes. Through numerical calculations of the present model, we obtain two results: i) there are cases where non-uniform (element-dependent) distribution of the degree of errors in an ant colony enables the colony to make an optical foraging, ii) according to the variation of food-supplying environment, a transition of the optimal distribution of errors from the non-uniform distribution to the uniform distribution takes place. These results indicate that the idea of strategy of errors has a more scalability than that originally considered.
著者
石井 晃 太田 奨
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.25, no.2, pp.50-58, 2015

We apply a mathematical theory for hit phenomenon for prediction of the "general election" of AKB48 which is very popular girls group in Japan.
著者
山本 野人 松田 望
出版者
一般社団法人 日本応用数理学会
雑誌
日本応用数理学会論文誌 (ISSN:24240982)
巻号頁・発行日
vol.15, no.3, pp.347-359, 2005-09-25 (Released:2017-04-08)

Both multiple-precision arithmetic and validated computation have close relationship with the quality of computation. They improve and insure the quality, respectively. We propose a method to compute Bessel functions with guaranteed accuracy, which works on MATLAB. Using multiple-precision arithmetic, the method gives as precise results as one wants together with information of how precise the results are. When it is sufficient to get the results in double-precision, one can use a fast version.
著者
山本 啓三 宮島 佐介 コーシャル ラジンダー 山田 裕子 コーシャル マンジュリカ
出版者
一般社団法人 日本応用数理学会
雑誌
日本応用数理学会年会予稿集 日本応用数理学会年会予稿集
巻号頁・発行日
pp.7, 2002-09-18 (Released:2003-03-18)

" 我々は前回の講演で高額所得のランキングがベキ乗を示す簡単なモデルを提案した。今回はそのモデルがどうしてベキ乗を示すのかについて検討した。我々はこのモデルがベキ乗を示すのはフラクタル性によるものと考えている。そのフラクタル性を示すの原因はその機構内に入れ子構造が存在するためと考えている。そこで、このモデル内にどのような仕組みで入れ子構造が構成されるのかを調査した。システム内の構成員が現在の所有額になるまでに何人の人たちと競争したか。その競争に参加した者を一つのtree構造のまとめ、そのtreeの大きさ(参加者数)とその件数についてのフラクタル性を調査することにより、構成されている入れ子構造を見つけることができた。 treeの大きさ=(順位)^-1.96 , treeの数=(treeの大きさ)^-1.57"