Kochi University of Technology Academic Resource Repository

磯部, 雅彦

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今年は新型コロナウイルス感染拡大の影響により、本学の活動も大きな制約を受けること
となりました。その中で、全学の学生・教職員の協力と工夫により、年度内に予定されたカ
リキュラムを実施するとともに、研究活動・社会貢献も可能な限り継続できており、紀要第
17巻も発刊にこぎつけることができました。それだけでなく、劇的に変化した社会状況の
中で、それを乗り越え、適応する中で、将来に向けての新たな活動の可能性が開けてきてい
ます。遠隔講義という新たな教育手段の飛躍的な進化や、学内外でのウェブ会議の利用によ
る効率化・高機能化など、感染拡大がなければこれだけ早く進むことはなかったでしょう。
是非、このような経験と成果を将来に活かしたいと思っています。
本巻では、まず里山基盤科学技術の社会実装モデルプロジェクトの特集を組んでいます。
里山工学では、大学として科学的な裏付けに基づいて里山の特性を理解し、利用に結び付け
るという、地道ではあるが確実性のある成果を一歩一歩積み上げています。これにより、一
時的ではない、確固たる知見が蓄積されることが期待できます。また、高知県を対象とした
生活・文化に関わる本学の調査研究の一旦も紹介されており、本学の多面的な活動の一部が
ご理解いただけるものと思います。さらに、細分化された学問分野にはなじまず、通常の学
術雑誌では取り上げられない研究成果の紹介も紀要の持つ機能の一つであります。
これらの内容をご覧いただきながら、大学の担う多面的な機能を感じ取っていただければ
幸いです。
学長　磯部雅彦



Japanese

巻頭言

高知工科大学博士（学術）高知工科大学, 博士論文.doctoral thesi

ZHANG, Qiang

English

Nanostructured Titanium Dioxide Thin Films Synthesized by Mist CVD for Applications in Metal Oxide Thin Film Gas Sensors

高知工科大学博士（工学）高知工科大学, 博士論文.doctoral thesi

曲, 勇作

低温形成AgxO/InGaZnOx界面におけるSchottky特性の起源とそのフレキシブルデバイス応用

HERNURYADIN, Yayan

－1－ 
 
論 文 内 容 の 要 旨 
 
 
Resource sustainability issues are a growing concern today due to the overexploitation of natural resources 
with increasing population, market demand and mass production. For example, Indonesia is the second largest 
marine capture producer, contributing to food security in the world (FAO Fisheries and Aquaculture 
Department, 2016). However, some important fish stock in Indonesia is reported to have been severely 
depleted due to overexploitation. One of the main reasons for overexploitation is that fishermen tend to choose 
environmentally unfriendly fishing gear or advanced technology to catch more fish for immediate profits 
without considering fish stock sustainability. To ensure resource sustainability and food security, it is 
important to understand the possible myopic behavior or time preferences of societies; therefore, this study 
seeks to address these issues by conducting field experiments.  
 
Our research start with the analyzing individual time preferences fishermen and farmers as two main 
occupations that produce food utilizing natural resources. In the second stage, we analyze individual and 
group time preferences among fishermen, farmers and urban people. Finally, we analyze individual time 
preferences of married couples in a fishing society. The first experiment which is presented in the second 
chapter of this dissertation examines individual time preferences fishermen and farmers. We have conducted a 
discounting elicitation experiment for fishermen and farmers in Indonesia. The statistical analysis shows that 
fishermen are much more shortsighted than farmers, implying that fishermen should be induced to nurture a 
culture of cultivating and growing for sustainability of fish stock. 
 
In chapter 3, we present the second experiment which examine individual and group time preferences and 
their relation across the three societies. We conduct a field experiment to elicit individual and group discount 
factors in three societies of Indonesia—(i) the fisheries, (ii) the farming and (iii) the urban societies—as 
proxies of the hunter-gatherer, agrarian and industrial societies, respectively. We find that both individual and 
group discount factors are the lowest (highest) in the fisheries (agrarian) society, while those in the urban 
society are in the middle. We also observe that the determinants of group discount factors differ across 
societies: members of the lowest and middle discount factors in a group play an important role in determining 
the group discount factor in the fisheries society, while only the members with the middle discount factor are 
key in agrarian and urban societies. Overall, our results suggest that individual and group discount factors 
non-monotonically change as societies transition from fisheries to agrarian and from agrarian to urban and that 
comparatively shortsighted people (the lowest and middle) are more influential than farsighted people in 
determining group time preferences. 
 
The results in the first and second experiment show that fishermen are more shortsighted than farmers and 
urban people. Therefore, we analyze individual time preference in a fishing society in third experiment to 
identify what factors induce fishermen to be sufficiently farsighted to ensure the sustainability of marine 
resources that is presented in chapter 4. We conduct an experiment to elicit individual discount factors with 
200 married couples (200 fishermen and 200 fishermen’s wives) in an Indonesian fishing society, Karawang 
regency. We find that the fishermen’s discount factors are slightly higher than those of their wives on average, 
with a positive correlation between the two. We also find that their incomes have idiosyncratic influences on 
the individual time preferences of a couple. Fishermen’s incomes weakly influence only their wives’ time 
preferences, while wives’ incomes significantly and positively cause both fishermen’s and wives’ time 
preferences to be farsighted. This result suggests that the economic empowerment of fishermen’s wives is 
－2－ 
important for the sustainability of marine resources and societies in Indonesia. From these findings, effective 
policies or new education systems, such as training/conservation programs or institutions to change people’s 
cultures to be more patient, are essential along with economic empowerment of fishermen’s wives. Without 
such a policy, the resource sustainability in Indonesia might pose a greater danger in the future.  
 
Key Words: discount factors; individuals and groups; fisheries society; farming society; urban society. 
 


TIME PREFERENCES FOR SUSTAINABILITY IN INDONESIA

唐澤, 颯人

小型Blended Wing Body旅客機の空力性能評価と形状探索

須賀, 絃貴

FRPプリプレグのその場硬化度測定手法の改良

田頭, 侑貴

ミストCVD法による酸化ガリウム系MESFETの開発と特性

田村, 健太

水溶液を用いた氷膜の熱伝導現象に関する研究

猪岡, 柚香

バンドギャップ基準電源回路を対象としたBIST手法に関する研究

井上, 舜也

看護演習における手の圧力変化データを用いた触診技術分析

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