Kouji Ohta

10.7k total citations · 1 hit paper
184 papers, 4.5k citations indexed

About

Kouji Ohta is a scholar working on Astronomy and Astrophysics, Instrumentation and Nuclear and High Energy Physics. According to data from OpenAlex, Kouji Ohta has authored 184 papers receiving a total of 4.5k indexed citations (citations by other indexed papers that have themselves been cited), including 126 papers in Astronomy and Astrophysics, 53 papers in Instrumentation and 25 papers in Nuclear and High Energy Physics. Recurrent topics in Kouji Ohta's work include Galaxies: Formation, Evolution, Phenomena (90 papers), Astronomy and Astrophysical Research (53 papers) and Stellar, planetary, and galactic studies (47 papers). Kouji Ohta is often cited by papers focused on Galaxies: Formation, Evolution, Phenomena (90 papers), Astronomy and Astrophysical Research (53 papers) and Stellar, planetary, and galactic studies (47 papers). Kouji Ohta collaborates with scholars based in Japan, United States and United Kingdom. Kouji Ohta's co-authors include Masayuki Akiyama, Yoshihiro Ueda, T. Miyaji, Tōru Yamada, Naoyuki Tamura, Kentaro Aoki, Yuichi Matsuda, Masami Ouchi, Yoshiaki Taniguchi and Yasuhiro Shioya and has published in prestigious journals such as Nature, The Astrophysical Journal and Journal of Bacteriology.

In The Last Decade

Kouji Ohta

169 papers receiving 4.3k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Cosmological Evolution of the Hard X‐Ray Active Galactic Nucleus Luminosity Function and the Origin of the Hard X‐Ray Background

2003 654 citations Masayuki Akiyama, Kouji Ohta et al. The Astrophysical Journal profile →

Peers

Countries citing papers authored by Kouji Ohta

Since Specialization

Citations

This map shows the geographic impact of Kouji Ohta's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kouji Ohta with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kouji Ohta more than expected).

Fields of papers citing papers by Kouji Ohta

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kouji Ohta. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kouji Ohta. The network helps show where Kouji Ohta may publish in the future.

Co-authorship network of co-authors of Kouji Ohta

This figure shows the co-authorship network connecting the top 25 collaborators of Kouji Ohta. A scholar is included among the top collaborators of Kouji Ohta based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kouji Ohta. Kouji Ohta is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Analysis of multimodal large language models on visually-based questions in the Japanese National Examination for Dental Hygienists: A preliminary comparative study 2025 ·Journal of Dental Sciences ·(unknown), Yuichi Mine, (unknown), (unknown), (unknown), (unknown), Hideo Shigeishi, Toshinobu Takemoto, Naoya Kakimoto, Takeshi MURAYAMA, Kouji Ohta	1
2	Optical fiber-fed integral-field spectrograph KOOLS-IFU connected to the Seimei telescope 2025 ·Publications of the Astronomical Society of Japan ·(unknown), (unknown), Hidehiko Nakaya, Yukiko Kamata, Yutaka Yamagata, Takuya Hosobata, Masaaki Otsuka, Keisuke Isogai, Kouji Ohta	0
3	BECN1 Is Involved in Spheroid Formation and Resistance to 5‐FU‐Induced Cytotoxicity in CD44^high Oral Cancer Cells 2025 ·Oral Science International ·(unknown), Hideo Shigeishi, (unknown), Shigehiro Ono, Tomonao Aikawa, Masaru Sugiyama, Kouji Ohta	0
4	Galactic Structure Dependence of Cloud–Cloud-collision-driven Star Formation in the Barred Galaxy NGC 3627 2025 ·The Astrophysical Journal ·(unknown), Kouji Ohta, Fumi Egusa, Yusuke Fujimoto, Masato I. N. Kobayashi, (unknown), Asao Habe	2
5	Major merger fraction along the massive galaxy-quenching channel at 0.2 < z < 0.7 2024 ·Publications of the Astronomical Society of Japan ·(unknown), Kouji Ohta, Yoshihisa Asada, Marcin Sawicki, G. Desprez, Stephen Gwyn, (unknown)	1
6	Detection of CO(1−0) Emission at the Tips of the Tidal Tail in the Antennae Galaxies 2024 ·The Astrophysical Journal ·(unknown), Fumi Egusa, (unknown), Shuhei Inoue, Kotaro Kohno, Shinya Komugi, Kouji Ohta, Yoshihisa Asada, Yusuke Fujimoto, Asao Habe, Bunyo Hatsukade, (unknown), Hiroyuki Kaneko, Masato I. N. Kobayashi, Tomoka Tosaki	0
7	Manual toothbrushes, self-toothbrushing, and replacement duration to remove dental plaque and improve gingival health: A scoping review from recent research 2024 ·Journal of Dentistry ·(unknown), Hideo Shigeishi, (unknown), Toshinobu Takemoto, Masaru Sugiyama, Kouji Ohta	2
8	HPV16 E6 and E7 are involved in inhibition of autophagy and maintenance of cancer stem cell properties in HPV16‐positive oral squamous cell carcinoma cells 2023 ·Oral Science International ·Hideo Shigeishi, Masaru Sugiyama, (unknown), (unknown), Tomoko Maehara, Kouji Ohta	1
9	Relationship between oral and physical function and length of participation in long-term care prevention programs in community-dwelling older Japanese women 2020 ·European Geriatric Medicine ·(unknown), Ayumi Saito, Hideo Shigeishi, Kouji Ohta, Masaru Sugiyama	8
10	Oral human cytomegalovirus prevalence and its relationships with periodontitis and Porphyromonas gingivalis in Japanese adults: a cross-sectional study 2020 ·Journal of Applied Oral Science ·Mariko Nakamura, Hideo Shigeishi, (unknown), Masaru Sugiyama, Kouji Ohta	7
11	Okayama Astrophysical Observatory Wide-Field Camera 2019 ·Publications of the Astronomical Society of Japan ·K. Yanagisawa, Yasuhiro Shimizu, Kiichi Okita, D. Kuroda, (unknown), Hisashi Koyano, Hideyuki Izumiura, M. Yoshida, Kouji Ohta, N. Kawai, Y. Nakada, Tomoyasu Yamamuro	2
12	A Catastrophic Failure to Build a Massive Galaxy around a Supermassive Black Hole at z = 3.84 2019 ·The Astrophysical Journal ·Malte Schramm, W. Rujopakarn, J. D. Silverman, Tohru Nagao, Andreas Schulze, Masayuki Akiyama, Hiroyuki Ikeda, Kouji Ohta, Jari Kotilainen	5
13	Why Are Some Gamma-Ray Bursts Hosted by Oxygen-rich Galaxies? 2018 ·The Astrophysical Journal ·T. Hashimoto, (unknown), Kouji Ohta, Tomotsugu Goto, F. Hammer, A. K. H. Kong, K. Nomoto, J. Mao	5
14	Subaru/FOCAS Optical Spectroscopy for a possible IceCube-170922A counterpart TXS 0506+056 2017 ·ATel ·Tomoki Morokuma, Yasuyuki Tanaka, Kouji Ohta, Yoshiki Matsuoka, Takuji Yamashita, N. Kato	1
15	The environments of Ly α blobs – I. Wide-field Ly α imaging of TN J1338−1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula★ 2015 ·Monthly Notices of the Royal Astronomical Society ·Tomoki Saito, Yuichi Matsuda, C. G. Lacey, Ian Smail, Álvaro Orsi, C. M. Baugh, Akio Inoue, Ichi Tanaka, Tōru Yamada, Kouji Ohta, C. De Breuck, Tadayuki Kodama, Yoshiaki Taniguchi	11
16	Malignant ossifying fibromyxoid tumor of the tongue: case report and review of the literature 2013 ·Head & Face Medicine ·Kouji Ohta, Masayuki Taki, Ikuko Ogawa, Shigehiro Ono, Kuniko Mizuta, Shinichi Fujimoto, Takashi Takata, Nobuyuki Kamata	17
17	Locoregional immunotherapy of malignant effusion from colorectal cancer using the streptococcal preparation OK-432 plus Interleukin-2 2003 ·British Journal of Cancer ·Yoshiyuki Yamaguchi, Eiji Miyahara, (unknown), (unknown), Kouji Ohta, Katsuya Shimizu, Kazuhito Minami, Jun Hihara, (unknown), T Toge	21
18	Detection of molecular gas in the quasar BR1202 – 0725 at redshift z = 4.69 1996 ·Nature ·Kouji Ohta, Tōru Yamada, Kouichiro Nakanishi, Kotaro Kohno, Masayuki Akiyama, Ryohei Kawabe	71
19	The Complex Hα Velocity Field of NGC 1569 1994 ·Akihiko Tomita, Kouji Ohta, Mamoru Saitō	16
20	An Hα Velocity Field in the Irregular Galaxy IC 10 1992 ·Mamoru Saitō, (unknown), Kouji Ohta, Tōru Yamada	6

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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