Faculty Profiles - NAGAO, Masahiro

Papers - NAGAO, Masahiro

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Grammatical evolution using two-dimensional gene for symbolic regression: An advanced improvement with conditional statement grammar

Sugiura H., Nagao M., Zuo Y., Kita E.

International Journal of Critical Infrastructures Vol. 13 ( 1 ) page： 237 - 251 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：International Journal of Critical Infrastructures

Symbolic regression problems can be solved using grammatical evolution (GE), an evolutionary computation (EC) method, to find a function that coincides satisfactorily with the given datasets. The evolutional approach of GE is based on the grammar learning paradigm, which can translate the genotype (binary digit) into the phenotype (terminals and non-terminals). Unlike traditional codons in a genotype, the fittest codons in phenotype represented by the Backus-Naur form (BNF) are difficult for next generation genes to inherit the traits of parents, accounting for crossover and mutation. For this issue, this article presents a proposal of an advanced improvement to GE using a two-dimensional gene (GE2DG). In contrast to multi-chromosomal GE (GEMC), our proposal not only encloses the two-dimensional gene-expression for symbolic regression, but also introduces one independent gene defined as a conditional statement to express a new BNF grammar of an if-then (-else) branch. In the experiments described herein, continuous/discontinuous non-branch functions and continuous/discontinuous branch functions, four testing patterns, are considered as numerical examples. Results show that GE2DG has better performance than the original GE or GEMC. Especially for the case of branch functions, GE with hybrid chromosome (GEHC), where GE2DG is incorporated with GEMC, has faster convergence in symbolic regression than other methods.

DOI： 10.1504/IJCIS.2017.083634

Scopus

A self-regenerable soot sensor with a proton-conductive thin electrolyte and a nanostructured platinum sensing electrode

Lv Peiling, Ito Takenori, Oogushi Akihide, Nakashima Kensaku, Nagao Masahiro, Hibino Takashi

SCIENTIFIC REPORTS Vol. 6 page： 37463 2016.11

Kinetically driven switching and memory phenomena at the interface between a proton-conductive electrolyte and a titanium electrode

Hibino Takashi, Kobayashi Kazuyo, Nagao Masahiro

SCIENTIFIC REPORTS Vol. 6 page： 31691 2016.8

A Rechargeable Tin–Air PEM Battery Using SnSO4 as an Anode-active Material

Kobayashi Kazuyo, Nagao Masahiro, Hibino Takashi

Chemistry Letters Vol. 45 ( 2 ) page： 161 - 163 2016.2

Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

SnSO4 was employed as an anode-active material for rechargeable batteries, where Sn4+ and Sn2+ ions are reduced to Sn2+ and Sn, respectively during charge while the inverse reactions occur during discharge. Undesired hydrogen production was substantially avoided by adjusting the charge voltage to 1.5 V. The resulting cell functioned as a battery with an electrical capacity of 258 mA h g−1 at 10 mA cm−2 and as a fuel cell with power densities of 55–125 mW cm−2 at 0.8 V.

DOI： 10.1246/cl.151015

Web of Science

Scopus

CiNii Research

Rechargeable Metal-Air Proton-Exchange Membrane Batteries for Renewable Energy Storage

Nagao Masahiro, Kobayashi Kazuyo, Yamamoto Yuta, Yamaguchi Togo, Oogushi Akihide, Hibino Takashi

CHEMELECTROCHEM Vol. 3 ( 2 ) page： 247 - 255 2016.2

Rechargeable metal-air proton -exchange membrane batteries for renewable energy storage Reviewed

Masahiro Nagao, Kazuyo Kobayashi, Yuta Yamamoto, Togo Yamaguchi, Akihide Oogushi, Takashi Hibino

ChemElectroChem Vol. 3 page： 247-255 2016

Kinetically driven switching and memory phenomena at the interface between a proton-conductive electrolyte and a titanium electrode Reviewed

Takashi Hibino, Kazuyo Kobayashi, Masahiro Nagao

Scientific Reports Vol. 6 page： 31691 2016

A self-regenerable soot sensor with a proton-conductive thin electrolyte and a nanostructured platinum sensing electrode Reviewed

Peiling Lv, Takenori Ito, Akihide Oogushi, Kensaku Nakashima, Masahiro Nagao, Takashi Hibino

Scientific Reports Vol. 6 page： 37463 2016

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H3PO4-Modified BaZr0.8Y0.2O3-delta Electrolyte and an IrO2-Catalyzed Sensing Electrode

Lv Peiling, Oogushi Akihide, Nakashima Kensaku, Kobayashi Kazuyo, Nagao Masahiro, Hibino Takashi

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 163 ( 14 ) page： B761 - B767 2016

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Hibino Takashi, Kobayashi Kazuyo, Nagao Masahiro, Yamamoto Yuta

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 163 ( 7 ) page： A1420 - A1428 2016

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H3PO4-Modified BaZr0.8Y0.2O3-δ Electrolyte and an IrO2-Catalyzed Sensing Electrode Reviewed

長尾征洋

Journal of The Electrochemical Society Vol. 163 2016

Diversity oriented multi-objective island based genetic algorithm for flexible job shop scheduling considering setup operator regulation Reviewed

Masahiro Nagao, Takuya Sugimoto, Yasuhiko Morinaga, and Mitsuru Sano

Journal of Human Environmental Studies Vol. 12 ( 1 ) page： 1-12 2015.6

A Direct Urine Fuel Cell Operated at Intermediate Temperatures

Nagao Masahiro, Kobayashi Kazuyo, Hibino Takashi

Chemistry Letters Vol. 44 ( 3 ) page： 363 - 365 2015.3

Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

Direct utilization of urine in fuel cells is a promising technology for conversion into electricity. Here, we report the design of anode materials for high-temperature direct urine fuel cells and the performance of a fuel cell with an optimized anode at 300 °C. The resultant peak power densities reached 16.7 mW cm−2 for urine and 26.5 mW cm−2 for urea.

DOI： 10.1246/cl.141067

Web of Science

Scopus

CiNii Research

High-temperature supercapacitor with a proton-conducting metal pyrophosphate electrolyte

Hibino Takashi, Kobayashi Kazuyo, Nagao Masahiro, Kawasaki Shinji

SCIENTIFIC REPORTS Vol. 5 page： 7903 2015.1

Diversity oriented multi-objective island based genetic algorithm for flexible job shop scheduling considering setup operator regulation

Nagao Masahiro, Sugimoto Takuya, Morinaga Yasuhiko, Sano Mitsuru

Journal of Human Environmental Studies Vol. 13 ( 1 ) page： 1 - 12 2015

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Society for Human Environmental Studies

The flexible job-shop scheduling problem has received considerable attention in the production scheduling field. Setup operators are inseparable from the system of a small-volume and widely diverse producing. The work load balance among setup operators is important to increase the satisfaction at work. In this paper, a diversity-oriented multi-objective island based genetic algorithm is proposed to solve the FJSP considering the setup operators as a constraint. The total tardiness of each product and the difference of the setup number between setup operators are regarded as objectives and optimized using the Pareto-based method. When the proposed GA is applied to a test instance with moderate size of the problem complexity, it obtained the two exact solutions within a few seconds. Results show that the proposed algorithm, which was applied to the realistic production planning of the model enterprise, improves diversity of sub-solutions and the local search performance by the introduction of the diversity-oriented evaluation of each island, and emigration strategy among islands.

DOI： 10.4189/shes.13.1

CiNii Research

Rechargeable PEM Fuel-Cell Batteries Using Porous Carbon Modified with Carbonyl Groups as Anode Materials International coauthorship

Kobayashi Kazuyo, Nagao Masahiro, Yamamoto Yuta, Heo Pilwon, Hibino Takashi

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 162 ( 8 ) page： F868 - F877 2015

Rechargeable PEM Fuel-Cell Batteries Using Quinones as Hydrogen Carriers

Nagao Masahiro, Kobayashi Kazuyo, Yamamoto Yuta, Hibino Takashi

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 162 ( 4 ) page： F410 - F418 2015

Low-temperature Sintering of Yttria-stabilized Zirconia Using Bismuth–Vanadium Oxide as a Sintering Aid at 800 °C

Nagao Masahiro, Kobayashi Kazuyo, Hibino Takashi

Chemistry Letters Vol. 43 ( 12 ) page： 1887 - 1889 2014.12

Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

The effect of the addition of copper-doped bismuth–vanadium oxide to yttria-stabilized zirconia (YSZ) on the sinterability and electrical conductivity, especially in reducing atmospheres, has been investigated. When Bi2Cu0.1V0.9O5.35 was used as a sintering aid, the sintering temperature could be reduced to 800 °C, whereas the conventional sintering process requires temperatures above 1300 °C. Although the conductivity of YSZ with 1.5 mol % Bi2Cu0.1V0.9O5.35 was slightly lower than that of pure YSZ sintered at 1300 °C, no PO2 dependence was observed under reducing conditions (e.g., PO2 = 10−5–10−24 atm), which indicates that the electrolyte is applicable to solid-oxide fuel cells.

DOI： 10.1246/cl.140712

Web of Science

Scopus

CiNii Research

Solo pool-punishers defeat free-riders through individual learning in compulsory public goods games

Mitsuru Sano, Kenta Nagasawa, and Masahiro Nagao

Social for Human Environmental Studies Vol. 12 ( 2 ) page： 181-189 2014.12

Proton-conducting tin phosphates for electrochemical applications operating at intermediate temperatures Invited

Masahiro Nagao

Journal of Material Sciences & Engineering Vol. 3 ( 3 ) page： 64 2014.10

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Papers - NAGAO, Masahiro