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- David B. Fogel, Greg Fogel, Kazunari Ohkura
- Bio Systems
- 2001

Self-adaptation is a common method for learning online control parameters in an evolutionary algorithm. In one common implementation, each individual in the population is represented as a pair of vectors (x, sigma), where x is the candidate solution to an optimization problem scored in terms of f(x), and sigma is the so-called strategy parameter vector that… (More)

- Hideaki Nagamune, Takeshi Maeda, Kazunari Ohkura, Kei Yamamoto, Makoto Nakajima, Hiroki Kourai
- Toxicology in vitro : an international journal…
- 2000

The cytotoxic effects of newly synthesized bis-quaternary ammonium compounds (bis-QACs) and benzalkonium chloride were investigated on skin and blood cells, namely normal human epidermal keratinocytes of neonatal foreskin, a normal human skin fibroblast cell line NB1RGB, erythrocytes and a lymphoma cell line JM. The bis-QACs tested were 4,… (More)

The phase structure associated with the chiral symmetry is thoroughly investigated at finite temperature in the supersymmetric Nambu-Jona-Lasinio model with a soft SUSY breaking term. It is found that the chiral symmetry broken at vanishing temperature is recovered at sufficiently high temperature and the symmetry restoration takes place as the first order… (More)

- Junya Hashida, S . Mukaigawa, Taizo Muta, Kazunari Ohkura
- 2008

The phase structure associated with the chiral symmetry is thoroughly investigated in de Sitter spacetime in the supersymmetric Nambu-Jona-Lasinio model with supersymmetry breaking terms. The argument is given in the three and four space-time dimensions in the leading order of the 1/N expansion and it is shown that the phase characteristics of the chiral… (More)

- Junya Hashida, S . Mukaigawa, Taizo Muta, Kazunari Ohkura, Kei Yamamoto
- 2008

Chiral phase transitions driven by space-time curvature effects are investigated in de Sitter space in the supersymmetric Nambu-Jona-Lasinio model with soft supersymmetry breaking. The model is considered to be suitable for the analysis of possible phase transitions in inflationary universe. It is found that a restoration of the broken chiral symmetry takes… (More)

- Junya Hashida, S. Mukaigawa, Taizo Muta, Kazunari Ohkura, Katsuji Yamamoto
- 1999

Chiral phase transitions driven by space-time curvature effects are investigated in de Sitter space in the supersymmetric Nambu–Jona-Lasinio model with soft supersymmetry breaking. The model is considered to be suitable for the analysis of possible phase transitions in inflationary universe. It is found that a restoration of the broken chiral symmetry takes… (More)

- Shigenori Kagiyama, Shunichiro Kumamoto, Akira Minaka, Akihiro Nakamura, Kazunari Ohkura, Shogo Yamaguchi
- 2002

Deconfinement transition from hadron phase to quark-gluon plasma phase is investigated by two types of equation of hadron state, namely ideal hadron gas model and the compressible bag model. It is pointed out that, while the ideal gas model produces unrealistic extra hadron phase, the compressible bag model gives an expected and reasonable phase diagram… (More)

- Shigenori Kagiyama, Shunichiro Kumamoto, Akira Minaka, Akihiro Nakamura, Kazunari Ohkura, Shogo Yamaguchi
- 2002

The phase structure of hadrons and quark-gluon plasma is investigated by two types of equation of hadron state, namely ideal hadron gas model and the compressible bag model. It is pointed out that, while the ideal gas model produces unrealistic extra hadron phase, the compressible bag model gives an expected and reasonable phase diagram even if rich hadron… (More)

The structure of chiral symmetry restorations at finite temperature is thoroughly investigated in the supersymmetric Nambu-Jona-Lasinio model with a soft supersymmetry breaking term. It is found that the broken chiral symmetry at vanishing temperature is restored at sufficiently high temperature in two patterns, i. e., the first order and second order phase… (More)

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