「ネイピアの計」は，John Napier が自身の著書で発表した ２進数の四則演算が手軽に行なえる計のことである．たとえば大学入学前の導入教育としてこの計を用いれば，２進数の四則演算を視覚的に分かりやすく説明できるので，情報学の初学者でも理解しやすく，さらにこのことがきっかけで情報学への興味が湧いてモチベーションの高い状態で入学後の初年次教育へつなげられると期待される．本稿では，この流れに沿って開発した教材を実際に工学院大学での入学前教育に用いた実施報告をし，さらにその場で取ったアンケート結果についても紹介して，教材の改善案や今後の方向性を述べる．

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This paper reviews historical trends of electric power system simulation technology focusing on the method of symmetrical coordinates and ac network analyzer. The method of symmetrical coordinates was proposed by C. L. Fortescue in 1918. The method of symmetrical coordinates was refined from the original usage and became very easy application form for ac network analyses by S. Bekku in Japan. The origin of ac network analyzer was invented in 1925. Ac network analyzer was improved greatly in its operation by applying the method of symmetrical coordinates particularly in analyses of power networks under unsymmetrical conditions. On the other hand, the method of symmetrical coordinates was improved by the idea of equivalent circuit which was born from application of the method to ac network analyzer. This paper describes historical interactive relationship in establishment of the method of symmetrical coordinates and ac network analyzer.

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1. We applied the Integrator for the calculation of the integral dose.
2. It is necessary to determine the volume which has been irradiated by a given dose of radiation. The mechanism in measurring the Moment was used to calculate the integral dose.
3. A measured isodose chart in actual size was drawn onsectionpaper. Then, the Integrator was prepared as indicated in the direction for use. One half of each area surrounded by isodose curves was traced with the tracing point.
4. Moment 1/2∫Y² dx was obtained by the reading of the Integrating wheel (M). And the volume was given by the equation V=M×K×2π
where M is the reading of the Integrating wheel and K is constant.
5. In such way, the volume of each area surrounded by isodose curves was obtained. Then, the integral dose was expressed by the total of the products of the volume of each area and the mean depth dose in the same area.
6. The integral dose obtained with the Integrator in the plastic scintillator was 1.22×10³g-r per unit exposure dose, and was as nearly equal as the value presented by Bewley et al (1.33×10³g-r). The total volume measured with the Integrator was 11, 699, 1cc., and its calculated value was11, 780cc. Thedifferencebetween the former and the latter was less than 0.7%.
7. Thus the integral dose could be easily obtained from isodose charts by the use of the Integrator.

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本稿は，明治大学で開催された日本管理会計学会2022年度年次全国大会での井上潤氏の特別講演をとりまとめたものである．特別講演では，まず渋沢栄一の人格や思想の形成に重要な影響を与えた生誕地（武蔵国榛沢郡血洗島村）の先進性，藍玉の製造販売を主とする富裕な農家に育った家庭と儒学に基づく教育環境の紹介から始まり，日本の近代化に尽力した渋沢栄一の波瀾万丈の生涯と業績を説明された．とくに財務的・実務的能力が評価された渋沢栄一はパリ万国博覧会の幕府使節団の一員として渡欧した経験から銀行や株式会社，鉄道に大きな関心を寄せ，それら社会的基盤の確立には合本主義が重要だと認識し，また事業を進めるにあたっては何よりも公益を優先し，「論語と

」，「道徳経済合一説」の立場から事業活動を実践してきた．さらに渋沢栄一は日本における商業教育や女子教育の普及，社会福祉事業，国際交流にも多大な貢献をした．

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