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  • 坪田 誠
    日本物理学会誌
    1993年 48 巻 3 号 198-202
    発行日: 1993/03/05
    公開日: 2008/04/14
    ジャーナル フリー
  • 坪田 誠, 前川 進
    日本機械学会論文集 B編
    1993年 59 巻 560 号 1012-1015
    発行日: 1993/04/25
    公開日: 2008/03/28
    ジャーナル フリー
    The turbulent state of superfluid helium at very low temperatures presents some important and unresolved problems. The turbulent state has a dense tangle of quantized vortex filaments that are characteristic in superfluid. Little is known, however, about their dynamics, particularly, interactive motion. The present paper studies three-dimensional dynamics of two interacting vortex filaments numerically. The equations of motion and the method of numerical calculation follow those of Schwarz. Two identical vortex rings which are initially placed far apart proceed toward the same direction. They gradually become close due to of their interaction, then suddenly collide. The critical distance where the collision occurs is determined by the competition between the local self-induced field of onering and the nonlocal field of the other. The critical distance is grearly influenced by an applied superflow.
  • 井上 建二
    日本航空宇宙学会誌
    1986年 34 巻 392 号 491-498
    発行日: 1986/09/05
    公開日: 2009/05/25
    ジャーナル フリー
    A method is presented for calculating the flowfield about a cascade of arbitrary two-dimensional blades. A conformal transformation is used to generate a finite-difference grid. Implicit approximate factorization (AF) scheme is used for the solution of matrix equations resulting from finite-difference approximation to the full potential equation in conservation form. For transonic flows, an artificial viscosity, required to maintain stability in supersonic regions, is introduced by an upwind bias of the density. This allows the simple matrix form of the schevie to be retained over the entire flowfield. Supercritical test cases are considered. Blade Mach number or pressure distributions have been computed and are in good agreement with independent results.
  • 子どもの日常生活と大人の語りに着目して
    田 暁潔
    スポーツ人類學研究
    2020年 2020 巻 22 号 41-62
    発行日: 2020/12/31
    公開日: 2023/01/17
    ジャーナル オープンアクセス
      In recent years, increased attention has been paid to traditional sports and games as useful phenomenon to understand cultural identities in African countries. With this re-evaluation, national and international institutions began to develop educational programs for the transmission and conservation of traditional games. However, due to limited empirical investigation of play activities in different subsistence groups in Africa, understanding of play as cultural phenomena still pays little attention to children and their roles in cultural generations. This limitation may lead to misunderstanding or misinterpretation of play and its transmission in different sociocultural contexts. Till now, anthropological studies focused on children and their development in non-western contexts highlighted the active roles children take in cultural generations through their participation in social activities. These studies emphasized the importance of understanding the diverse forms of children,s cultural learning in different sociocultural contexts, and this focus could also be applied to the study of play and its transmission in time and space.
      This study investigates the daily play of children and its transformations across generations within a pastoralist Maasai society in Southern Kenya. Focal observation of the daily activities of 13 children (2 to 11 years old) has been conducted, and children,s daily play was documented considering their contents, locations and participants. In addition, 80 adults (40 females, 40 males) in the same area were interviewed about their playing experiences during childhood.
      Findings of this study show, first, various play activities were continuously practiced by Maasai across generations during childhood. Second, children,s participation in play activities are usually only undertaken with peers, and without instructions or guidance from adults. Third, through daily play children continuously develop their intimate relationship with livestock and natural elements such as plants, insects and wild animals. Results from this study highlight that culturally significant play activities are still continuously practiced by young generations in societies where children continue their social activities whilst performing other roles. In these societies, instead of taking traditional sports and games as practices of the past, and incorporating them into the school curriculum, it is necessary to document the transformations of different local play activities in concurrent sociocultural contexts considering children,s social participation, their roles in culture generation, adult generations, play experience during childhood, and the features of learning in the targeted society. For doing so, further investigation of daily childhood experiences using ethnographic documentation is recommended.
  • 機能システムの発達という視点
    土倉 英志
    認知科学
    2014年 21 巻 1 号 155-172
    発行日: 2014/03/01
    公開日: 2015/02/02
    ジャーナル フリー
    Many cognitive scientists have studied people’s use of tools and artifacts, in other
    words, resources. However, there are two features of resources that have not been ad-
    dressed by cognitive scientists. The first is the configuration of resources. Resources
    do not exist scatteredly; they exist in an order. Actions are organized in accordance
    with the order of resources. Therefore, it is important to consider the configuration of
    resources when studying people’s actions in everyday life. The second feature that has
    not been addressed is that people arrange resources in their environment to conduct
    everyday life and work well. To clarify the features supporting everyday life based on
    these two points, I believe that it is important to examine the adjusted relationship
    between actions and resources and its attendant developmental processes. Therefore, I
    propose a perspective called the development of functional systems. Functional systems
    consist of actions and resources; the relationship between actions and resources adjust
    as time progresses. I call this process of change in the relationship between actions and
    resources the development of functional systems. Based on this proposal, I examine the
    theme of human agency, learning, and child development from the perspective of the
    development of functional systems. At the end, I discuss the limitations of this paper
    and suggest directions for future research.
  • 田近 一郎, 本多 一彦, 杉江 晶子, 森 博
    名古屋文理大学紀要
    2017年 17 巻 11-23
    発行日: 2017/03/31
    公開日: 2021/03/01
    研究報告書・技術報告書 フリー
    本タイトル第4報ではタブレット端末を利用したビジュアルプログラミング教育の急速な発展を紹介するとともにその特徴について議論する.以前の報告でタブレット端末を利用した先進の教育を紹介してきが,この 分野の発展は著しくプログラミング教育における最新の動向とそれの基づいた方向性を打ち出す必要性があると考えたからである.本報は1:様々なビジュアルプログラミングツール,2:オブジェクト指向プログラミ ング理解のためのビジュアルプログラミングの活用,3:教養教育としてのプログラミングの3部構成になっている.最後にここ数年,大学におけるプログラミング教育のあるべき方向性について考察する.
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