The Impact of Military Technology Development on Innovation: Evidence from Prewar and Wartime Japanese Secret Patents

Kotani, Atsuki：Kentaro Nakajima：Tetsuji Okazaki：Yukiko U. Saito
25-E-093 RIETI Discussion Paper Series （2025/09/01）

Innovations in military technology potentially drive significant societal transformations through applications to civilian use. This study aims to quantitatively measure the impact of military technology development on civilian innovation activities using prewar and wartime Japanese patent data from 1916 to 1945. By exploiting Japan's …

The role of human interaction in innovation: evidence from the 1918 influenza pandemic in Japan

Inoue, Hiroyasu：Kentaro Nakajima：Tetsuji Okazaki：Yukiko U. Saito
『The Japanese Economic Review』 Vol.76 No.3 pp.795-820 （2025/06/19）

This study empirically investigates human interaction’s role in innovation by exploiting the 1918 influenza pandemic in Japan from 1918 to 1921, which prohibitively incr…

Invention by Collage Graduates in Science and Engineering during Japan's Industrialization

Yamaguchi, Shotaro：Hiroyasu Inoue：Kentaro Nakajima：Tetsuji Okazaki：Yukiko Umeno Saito：Serguey Braguinsky
22-E-104 RIETI Discussion Paper Series （2022/11/01）

During Japan's industrialization from the late 19th to the first half of the 20th century, the adoption of foreign technologies was　increasingly complemented by domestic…

Language Barriers and the Speed of Knowledge Diffusion

Higham, Kyle: Sadao Nagaoka
22-E-074 RIETI Discussion Paper Series （2022/08/18）

リニア中央新幹線と中部圏経済

中部圏研究 （2022/06/01）

（公財）中部圏社会経済研究所（編）, 219号, 66-73頁：中島賢太郎

The Role of Face-to-face Contact in Innovation: The Evidence from the Spanish Flu Pandemic in Japan

Inoue, Hiroyasu： Kentaro Nakajima： Tetsuji Okazaki： Yukiko Umeno Saito
22-E-026 RIETI Discussion Paper Series （2022/03/01）

Local Industry Influence on Commercialization of University Research by University Startups

Kang, Byeongwoo : Kazuyuki Motohashi
20-E-086 RIETI Discussion Paper Series （2020/11/01）

戦前期日本のイノベーション活動：特許情報の電子化によるアプローチ

井上 寛康 : 岡崎 哲二 : 齊藤 有希子 : 中島 賢太郎
20-P-012 RIETI Discussion Paper Series （2020/04/01）

日本の近代化の過程におけるイノベーションのあり方、役割について、特許情報から把握するため、我々は1910年から1945年にかけての特許書誌情報の電子化を行うことで、戦前期特許書誌情報データベースの構築を行っている。本稿では、データベース構築の方法を説明し、作成したデータベースを用いた記述的分析を、特に当時のイノベーション活動の地理的分布…

Book Review: Jinzai no kokusai ido to inobeshon (International Migration of Highly Skilled Workers and Innovation, by Yukiko Murakami, Tokyo: NTT Publishing, 2015)

Nakajima, Kentaro
『Social Science Japan Journal』 Vol. 20 No. 2 pp.323-325 （2017/08/01）

Descriptive analysis of the knowledge network formation in East Asia

Nabeshima, Kaoru : Byeongwoo Kang : Mila Kashcheeva
『Technology in Society』 Vol.47 pp. 66-100 （2016/11/01）

This paper shows descriptively how the knowledge network in East Asia has been formed. In addition, the correlation between the knowledge network and economic growth is also examined. Evidence is provided to show that plugging into the knowledge network of developed economies could be a key for increasing innovativeness in an economy.

Testing for localization: A new approach

Murata, Yasusada : Ryo Nakajima : Ryuichi Tamura
WP#16-11 一橋大学イノベーション研究センター （2016/08/19）

Recent empirical studies document that knowledge spillovers attenuate and industry localization decays with distance. It is thus imperative to detect localization accurately especially at short distances. We propose a new approach to testing for localization that corrects the first-order bias at and near the boundary in existing method…