The chart shows the distribution of publications by all Research.com ranked scientists in the field of Immunology in 2026. The highlighted bar marks where Koichi Hirai sits on this spectrum.
This scientist: 167 publications — 22nd percentile
22% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 807 publications or more.
The chart shows the D-index (discipline H-index) distribution of Immunology scientists ranked by Research.com in 2026. The highlighted bar marks where Koichi Hirai sits on this spectrum.
This scientist: 56 D-Index — 26th percentile
26% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 157 D-Index or more.
Koichi Hirai is affiliated with the University of Tokyo in Japan and has contributed to multiple areas within medical science. Their research spans a variety of focused disciplines, including surgery, health, toxicology and mutagenesis, emergency medical services, molecular biology, and orthopedics and sports medicine.
The scientist's work covers several interrelated topics, notably water treatment and disinfection, pediatric health and respiratory diseases, polyamine metabolism and applications, hip and femur fractures, bone health and osteoporosis research, and pelvic and acetabular injuries.
Koichi Hirai has authored papers published in reputable venues such as:
Recent publications include:
The frequent coauthors collaborating with Koichi Hirai reflect a multidisciplinary approach, encompassing contributions from researchers such as R. Nomura, Takahiko Taniguchi, Kazuya Suzuoki, Rintaro Yokoi, and Kenji Akasaki.
Hiroyuki Nagase;Shu Okugawa;Yasuo Ota;Masao Yamaguchi
Takashi Sekiya;Misato Miyamasu;Masako Imanishi;Hirokazu Yamada
Luis M. Teran;Mitsuru Mochizuki;Joachim Bartels;Elba L. Valencia
Motoji Kitaura;Noriko Suzuki;Toshio Imai;Shin Takagi
Yuichiro Tsunemi;Hidehisa Saeki;Koichiro Nakamura;Takashi Sekiya
Takashi Ueda;Ken Ohta;Naohito Suzuki;Masao Yamaguchi
K Hirai;Y Morita;Y Misaki;K Ohta
Hiroyuki Nagase;Misato Miyamasu;Masao Yamaguchi;Takao Fujisawa
Takao Fujisawa;Yoshiko Kato;Jun Atsuta;Akihiko Terada
Akiko Komiya;Hiroyuki Nagase;Hirokazu Yamada;Takashi Sekiya
Takao Fujisawa;Yoshiko Kato;Hiroyuki Nagase;Jun Atsuta
Hiroyuki Nagase;Misato Miyamasu;Masao Yamaguchi;Masako Imanishi
T. Sekiya;H. Yamada;M. Yamaguchi;K. Yamamoto
Naomi Yamashita;Hiroyuki Tashimo;Hirobumi Ishida;Fujito Kaneko
Kuniko Nakayama;Shu Okugawa;Shintaro Yanagimoto;Takatoshi Kitazawa
M. Wakugawa;K. Nakamura;H. Hino;K. Toyama
Hajime Takizawa;Takayuki Ohtoshi;Ken Ohta;Naomi Yamashita
Kazumi Fukagawa;Toshiharu Nakajima;Kazuo Tsubota;Shigeto Shimmura
Hirokazu Yamada;Koichi Hirai;Misato Miyamasu;Motoyasu Iikura
Takashi Sekiya;Hirokazu Yamada;Masao Yamaguchi;Akira Ishii
Koichi Hirai;Masao Yamaguchi;Yoshikata Misaki;Toshiaki Takaishi
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