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Teacher Information (Degree and Achievements)
Teacher Details
SAKAI Hiroshi
SAKAI Hiroshi
- Affiliation
- Faculty of Data Science Department of Data Science
- Job rank
- Professor
- Position
Researcher Information
Area of expertise
Applied mathematics, computational logic mathematics, rough set theory, table data analysis
Courses in charge
Linear algebraic, analysis, table data mathematical analysis, table data mathematical analysis exercises
Educational background
1982 Graduated from the Department of Mathematics, Faculty of Science, Kyushu University
1987 Department of Information Systems, Graduate School of Science and Technology, Kyushu University
Acquisition of Ph.D. credits
Assistant Professor, Kyushu Institute of Technology
2024 Professor Emeritus of Kyushu Institute of Technology
Professor, Shimonoseki City University
Acquired degree
1989 Doctor of Science (Kyushu University)
Affiliated Society
International Rough Association, IEEE, Japanese Society of Intelligence and Intelligence Society, Japanese Society of Mathematics
Research Keywords
Rough sets and granular calculations, table data analysis, rule generation, incomplete information, NIS-apoli algorithms, decision support, machine learning by rule generation
Current research theme
"Roughset Non-Determined Information Analysis (RNIA) and its Applications"
We are conducting research to generate dependencies in tabular data as a rule, and propose and implement NIS-appori algorithms in order to spread their generation functions to incomplete information. The rules obtained by RNIA will be used to support decision-making, supplement missing values, identify characteristics and select attributes, and identify dependencies. Since table data can be processed uniformly, it is highly versatile, and discrete value table data, which is difficult to define average and dispersion, it is thought that it will also lead to complementing statistical methods.
Main research results and activities
[Thesis]
1.Attempt for machine learning by Completion of missing values and rule generation in rough set non-determined information analysis, Intelligence and Information Magazine, 2023, https://doi.org/10.3156/jsoft.35.4_746
2.Roughset Non-Determined Information Analysis and NIS-APPOLI System - Rules Generation System based on Possible World Semantics-, Intelligence and Information Magazine, 2020, https://doi.org/10.3156/jsoft.32.4_747
3.NIS-Apriori-based rule generation with three-way decisions and its application system in SQL, Information Sciences, 2020, https://doi.org/10.1016/j.ins.2018.09.008
4.Rough set-based rule generation and Apriori-based rule generation from table data sets: A survey and a combination, CAAI Trans. Intelligence Technology magazine, 2019, https://doi.org/10.1049/trit.2019.0001
Such as journals, international conference papers, approximately 150 articles.
Contracted results of scientific research expenses
Machine learning and its application from incomplete information tables by rule generation
Research Fundamental Research (C) April 2020 - March 2024
7 representatives, etc. https://nrid.nii.ac.jp/ja/nrid/1000060201513/
Others (lectures, appearances, committee members, etc.)
[Lecture] An Overview of NIS-Apriori Based Data Mining and Its Software Tool in SQL (Plenary lecture)
The 2nd Asian Conference on Artificial Intelligence Technology, sponsored by CAAI TiT, Chongqing, China, 2018
5 invited lectures.
[Committee]
1.International Rough Meeting Society, Senior Member, Advisory Member
2.CAAI Tran. Intelligence Technology (assistant editor)
3.IJRSDA (International Advisory Board)
4.IJRIS (Editorial Board Member)
5.PC members of the International Conference IJCRS, ISMIS, IUKM, FIM, etc.
6.Secretary of the Japan Society of Intelligence and Information Faziy, Rough Collective Theory Research Group
Lecturer, Faculty of Engineering, Kyushu Institute of Technology, 2024 (Statistics, Linear Mathematics B)
Classes and Seminars
My seminar
Applied Mathematical Laboratory
Roughset Non-Determined Information Analysis (RNIA) and its Applications


Social Activities
Response to SDGs