Koichi Koyama

5.4k total citations · 1 hit paper
140 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 140 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, Tadamitsu Kishimoto, Koichi Nakajima, Hiroshi Matsui, Susumu Tsunasawa, Fumio Sakiyama, Shin‐ichiro Kashiwamura, Tadatsugu Taniguchi, Akihiro Iwamatsu and Toshio Hirano 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

Complementary DNA for a novel human interleukin (BSF-2) t... 1986 2026 1999 2012 1986 500 1000 1.5k
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.

  1. Complementary DNA for a novel human interleukin (BSF-2) that induces B lymphocytes to produce immunoglobulin
    1986 1.8k citations Koichi Koyama et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Koichi Koyama Japan 27 958 940 731 567 522 140 4.4k
Paul J. Bertics United States 48 1.3k 1.3× 2.5k 2.7× 964 1.3× 367 0.6× 182 0.3× 132 6.9k
Monika Bauer Germany 30 1.5k 1.6× 1.0k 1.1× 356 0.5× 157 0.3× 240 0.5× 126 4.1k
Hiroshi Fujiwara Japan 48 3.7k 3.9× 2.0k 2.2× 1.3k 1.7× 573 1.0× 515 1.0× 397 9.5k
Joan K. Heath Australia 44 1.2k 1.3× 3.0k 3.2× 1.2k 1.6× 171 0.3× 164 0.3× 109 6.6k
Yoshihiro Asano Japan 39 1.3k 1.3× 1.9k 2.0× 518 0.7× 215 0.4× 171 0.3× 234 5.5k
Mario Petrini Italy 39 831 0.9× 1.4k 1.5× 2.1k 2.9× 154 0.3× 172 0.3× 319 7.2k
Vyacheslav Kalchenko Israel 29 1.5k 1.5× 781 0.8× 299 0.4× 205 0.4× 634 1.2× 70 4.1k
Oliver Schilling Germany 44 443 0.5× 3.6k 3.8× 1.9k 2.6× 215 0.4× 402 0.8× 230 7.3k
Masahiro Sato Japan 47 671 0.7× 4.5k 4.8× 532 0.7× 408 0.7× 113 0.2× 390 8.3k
James G. Boyd United States 30 766 0.8× 977 1.0× 654 0.9× 109 0.2× 373 0.7× 110 4.6k

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

20 of 20 papers shown
1.
Koyama, Koichi, et al.. (2018). Texture size control by mixing glass microparticles with alkaline solution for crystalline silicon solar cells. Journal of materials research/Pratt's guide to venture capital sources. 33(11). 1515–1522. 7 indexed citations
2.
Koyama, Koichi, et al.. (2016). Defect termination on crystalline silicon surfaces by hydrogen for improvement in the passivation quality of catalytic chemical vapor-deposited SiN. Japanese Journal of Applied Physics. 55(2). 3 indexed citations
3.
Ohdaira, Keisuke, et al.. (2015). Improvement in passivation quality and open-circuit voltage in silicon heterojunction solar cells by the catalytic doping of phosphorus atoms. Japanese Journal of Applied Physics. 54(7). 72301–72301. 15 indexed citations
4.
Koyama, Koichi. (2012). Relation between the lifting surface theory and the lifting line theory in the design of an optimum screw propeller. Journal of Marine Science and Technology. 18(2). 145–165. 12 indexed citations
5.
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Koyama, Koichi, Keisuke Ohdaira, & Hideki Matsumura. (2011). Excellent passivation effect of Cat-CVD SiNx/i-a-Si stack films on Si substrates. Thin Solid Films. 519(14). 4473–4475. 15 indexed citations
7.
Tanaka, Katsunori, Eric R. O. Siwu, Koki Hasegawa, et al.. (2010). Noninvasive Imaging of Dendrimer‐Type N‐Glycan Clusters: In Vivo Dynamics Dependence on Oligosaccharide Structure. Angewandte Chemie International Edition. 49(44). 8195–8200. 83 indexed citations
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Koyama, Koichi, Terue Okamura, Joji Kawabe, et al.. (2003). Evaluation of 18F-FDG PET with bladder irrigation in patients with uterine and ovarian tumors.. PubMed. 44(3). 353–8. 60 indexed citations
11.
Koyama, Koichi, Terue Okamura, Joji Kawabe, et al.. (2002). The usefulness of18F-FDG PET images obtained 2 hours after intravenous injection in liver tumor. Annals of Nuclear Medicine. 16(3). 169–176. 25 indexed citations
12.
Koyama, Koichi, Terue Okamura, Joji Kawabe, et al.. (2001). Diagnostic usefulness of FDG PET for pancreatic mass lesions. Annals of Nuclear Medicine. 15(3). 217–24. 64 indexed citations
13.
Hirai, Kouzo, Naohiko Umesaki, Osamu Ishiko, et al.. (2001). Combined diagnostic imaging for retroperitoneal schwannoma. Oncology Reports. 8(4). 773–5. 10 indexed citations
14.
Koyama, Koichi & Yoichi Ito. (2000). Mucosal mast cell responses are not required for protection against infection with the murine nematode parasite Trichuris muris. Parasite Immunology. 22(1). 21–28. 36 indexed citations
15.
Kawabe, Joji, Terue Okamura, M Shakudo, et al.. (1999). Thallium and FDG uptake by atelectasis with bronchogenic carcinoma. Annals of Nuclear Medicine. 13(4). 273–276. 7 indexed citations
16.
Kawabe, Joji, Terue Okamura, Koichi Koyama, et al.. (1998). Relatively high F-18 fluorodeoxyglucose uptake in paranasal sinus aspergillosis: A PET study. Annals of Nuclear Medicine. 12(3). 145–148. 13 indexed citations
17.
Midiwo, Jacob O., et al.. (1992). Benzoquinones in kenyan myrsinaceae part III1: A new 2,3-dihydroxy alkyl-1,4-benzoquinone (myrsinone) and 5-O-methyl embelin from Myrsine Africana. SHILAP Revista de lepidopterología. 5 indexed citations
18.
Fujita, Shinsaku, et al.. (1991). Dye releasers for instant color photography. Molecular design and synthetic design.. NIPPON KAGAKU KAISHI. 1–12. 7 indexed citations
19.
Kanaoka, Yuichi, Koichi Koyama, & Yasumaru Hatanaka. (1985). 11-Methyl-6H-isoindolo[2,1-a]indol-6-one. Journal of Photochemistry. 28(4). 575–576. 5 indexed citations
20.
Koyama, Koichi. (1975). A Numerical Method for Propeller Lifting Surface in Non-Uniform Flow and Its Application. Journal of the Society of Naval Architects of Japan. 1975(137). 78–87. 3 indexed citations

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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