Koichi Koyama

240 total papers · 5.4k total citations
139 papers, 4.4k citations indexed

About

Koichi Koyama is a scholar working on Electrical and Electronic Engineering, Materials Chemistry and Cellular and Molecular Neuroscience. According to data from OpenAlex, Koichi Koyama has authored 139 papers receiving a total of 4.4k indexed citations (citations by other indexed papers that have themselves been cited), including 42 papers in Electrical and Electronic Engineering, 24 papers in Materials Chemistry and 20 papers in Cellular and Molecular Neuroscience. Recurrent topics in Koichi Koyama's work include Silicon and Solar Cell Technologies (33 papers), Thin-Film Transistor Technologies (30 papers) and Silicon Nanostructures and Photoluminescence (22 papers). Koichi Koyama is often cited by papers focused on Silicon and Solar Cell Technologies (33 papers), Thin-Film Transistor Technologies (30 papers) and Silicon Nanostructures and Photoluminescence (22 papers). Koichi Koyama collaborates with scholars based in Japan, United States and United Kingdom. Koichi Koyama's co-authors include Tsutomu Miyasaka, Koichi Nakajima, Tadamitsu Kishimoto, Yoshiyuki Takahara, Tadashi Matsuda, Tadatsugu Taniguchi, Yasuo Watanabe, Toshio Hirano, Kiyoshi Yasukawa and Akihiro Iwamatsu and has published in prestigious journals such as Nature, Science and Journal of the American Chemical Society.

In The Last Decade

Koichi Koyama

135 papers receiving 4.2k citations

Hit Papers

normalize citations (0→100%) normalize lifespan (0→100%) sort by overperformance

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 benchmark for papers published in the same subfield and year, or reaches the top citation threshold in at least one of its specific research topics.

Complementary DNA for a novel human interleukin (BSF-2) that induces B lymphocytes to produce immunoglobulin

1986 1.8k citations Toshio Hirano, Kiyoshi Yasukawa et al. Nature profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author						Papers	Cites
Koichi Koyama	961	940	732	568	520	139	4.4k
Paul J. Bertics	1.3k 1.3×	2.5k 2.7×	968 1.3×	368 0.6×	182 0.3×	132	6.9k
Monika Bauer	1.5k 1.5×	1.0k 1.1×	355 0.5×	157 0.3×	240 0.5×	126	4.0k
Y. Hamada	802 0.8×	3.4k 3.6×	452 0.6×	281 0.5×	275 0.5×	194	7.0k
Mitsuhiro Matsumoto	658 0.7×	871 0.9×	490 0.7×	105 0.2×	374 0.7×	215	3.5k
Shinji Nakamura	576 0.6×	1.1k 1.2×	957 1.3×	103 0.2×	182 0.3×	180	5.1k
Joan K. Heath	1.2k 1.3×	3.0k 3.2×	1.2k 1.6×	169 0.3×	164 0.3×	109	6.6k
Yoshihiro Asano	1.3k 1.3×	1.9k 2.0×	519 0.7×	215 0.4×	171 0.3×	234	5.4k
H. Huber	1.4k 1.5×	2.2k 2.3×	1.6k 2.2×	200 0.4×	771 1.5×	308	7.8k
Oliver Schilling	439 0.5×	3.6k 3.8×	1.9k 2.6×	214 0.4×	400 0.8×	229	7.3k
Haipeng Liu	2.1k 2.2×	2.4k 2.5×	247 0.3×	332 0.6×	306 0.6×	142	5.6k

Countries citing papers authored by Koichi Koyama

Since Specialization

Citations

This map shows the geographic impact of Koichi Koyama'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 Koichi Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koichi Koyama more than expected).

Fields of papers citing papers by Koichi Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koichi Koyama. 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 Koichi Koyama. The network helps show where Koichi Koyama may publish in the future.

Co-authorship network of co-authors of Koichi Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Koichi Koyama. A scholar is included among the top collaborators of Koichi Koyama 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 Koichi Koyama. Koichi Koyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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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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