JAIST Repository
https://dspace.jaist.ac.jp/Title

環境による快適性と研究者科学研究への影響の数学モデ
ルに関する研究

Author(s)李, 知恒

CitationIssue Date2022-03

TypeThesis or Dissertation

Text version

ETDURLhttp://hdl.handle.net/10119/17784

RightsDescription

Supervisor:KIM, Eunyoung, 先端科学技術研究科, 博士

Japan Advanced Institute of Science and Technology

氏

名LI, Zhiheng

学

位の種

類

博士（知識科学）学

位記番号

博知第 301 号

学 位 授 与 年 月 日

令和 4 年 3 月 24 日
Research on the mathematical model about the influence

論

文

題

目

mechanism of indoor environment on researchers' comfort andproductivity

論 文 審 査 委 員

KIM, Eunyoung (main examiner) JAISTAssoc. Prof.

KOHDA, Youji

JAISTProfessor

YUIZONO, Takaya

JAIST

Professor

GOKON, Hideomi

JAIST

Assoc. Prof.

GEORGIEV, Georgi

Oulu University

Assoc. Prof.

論文の内容の要旨
With the development of society, the core of modern work has gradually shifted from the manufacturing industry to
the knowledge-based departments in indoor office environments. In line with the foregoing, indoor environment quality
is an important indicator of the status of the indoor environment. It not only reflects the comfort level of the researchers
in the building but also affects their performance, particularly in research institutions. However, due to the inherent
correlation among various environmental comfort indexes, it is difficult to evaluate the influence of specificenvironment physical parameters on researchers’ comfort and their research performances. Therefore, the main
objective of this paper is to develop a mathematical model that would determine the relationship between environment
physical parameters and research performance.
This study was based on an experiment carried out at a controlled research office in a pharmaceutical researchcompany located in the northeast of China. The controlled research office was equipped with a radiant floor heating
system that supplied heat in winter. A total of 32 researchers were recruited and divided into four experiment groups.
Each experiment group was required to conduct daily research activities under 12 different environment conditions.
Data were collected from physical environment measurements, subjective questionnaire surveys, and performance tests.
The results showed that changes in the thermal, visual, and acoustic environments had significant influences on theresearchers’ environmental perceptions and satisfactions. Moreover, the environment physical parameters exerted
significant impacts on the researchers’ response times in the performance tests and, consequently, had significant effects
on their research performance. For the influence weight of the items under environmental comforts, thermal comfort
had the highest weight, followed by visual comfort. Meanwhile, acoustic comfort had the least impact. In addition, there
was a positive correlation among the thermal, visual, and acoustic environments.
This paper also developed a mathematical model for evaluating the researchers’ performances based on the indoor
environment physical parameters. In order to establish the mathematical model, the improved environmental comfort
index was obtained by enhancing the three existing mathematical models. Based on a factor analysis of environment
comfort, the weight of each comfort index was obtained. Finally, through a nonlinear regression analysis between theperformance index and the indoor environment quality index, the relationship between research performance andenvironment physical parameters was obtained.
Keywords: Indoor environment quality, environmental comfort, environmental perception, environmental satisfaction
research performance

論文審査の結果の要旨
Recently, the importance of indoor environments has been increased tremendously and it needs to understand how
the indoor environments such as temperature, light, noise level effect on our comfort and performances. This
research developed a mathematical model to predict the researchers’ performance based on the actual datacollected in the winter season (13th Jan. – 1st Mar. 2021) from 32 participants who works in a research office inNortheast of China.
To develop a model, it reviewed and compared the widely used models in existing research with the collected data,and established the adjusted model with the improved environmental comfort index obtained by enhancing thethree existing mathematical models. Based on a factor analysis of environment comfort, the weight of eachcomfort index was obtained. Through a nonlinear regression analysis between the performance index and theindoor environment quality index, the relationship between research performance and environment physicalparameters was identified.
Finally this research suggest the value range and interval for different environmental variables: 1) Temperature:
20°C, 22°C, 24°C, 26°C, 28°C, 30°C ; 2) Illuminance level: 50lux, 200lux, 500lux, 1000lux ; 3) Backgroundnoise intensity: 45dB, 60dB, 70dB.
The model developed in this research can be applied and modified in further research in different environment.
Thus it has both theoretical and practical contribution in the area of human and environment for enhancing ourquality of life.
In summary, this is an excellent dissertation and we approve awarding a doctoral degree to Mr. LI Zhiheng inMarch 2022. All the committee members approved it on his final defense on Feb 2nd 2022.