Hiroshi Koyama
- Electrical and Electronic Engineering top 10%
- Astronomy and Astrophysics top 5%
- Materials Chemistry
- Molecular Biology
- Plant Science
- Co-authors
- Shu‐ichiro InutsukaEve C. OstrikerDM GeddesTomikichi WadaSatoshi NaitoKaoru YoshidaMasahiro WatanabeKazuhisa Sekimizu
- Topics
- Semiconductor materials and devices (20 papers)Integrated Circuits and Semiconductor Failure Analysis (15 papers)Astrophysics and Star Formation Studies (10 papers)
- Partner nations
- JapanUnited StatesGermany
In The Last Decade
Hiroshi Koyama
87 papers receiving 1.3k citations
Peers
Comparison fields: 5 of 127
- Electrical and Electronic Engineering 365
- Astronomy and Astrophysics 249
- Materials Chemistry 239
- Molecular Biology 174
- Plant Science 144
Countries citing papers authored by Hiroshi Koyama
This map shows the geographic impact of Hiroshi 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 Hiroshi Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroshi Koyama more than expected).
Fields of papers citing papers by Hiroshi Koyama
This network shows the impact of papers produced by Hiroshi 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 Hiroshi Koyama. The network helps show where Hiroshi Koyama may publish in the future.
Co-authorship network of co-authors of Hiroshi Koyama
This figure shows the co-authorship network connecting the top 25 collaborators of Hiroshi Koyama. A scholar is included among the top collaborators of Hiroshi 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 Hiroshi Koyama. Hiroshi Koyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.
All Works
| # | Work | Indexed citations |
|---|---|---|
| 1 | 2 | |
| 2 | 26 | |
| 3 | 2 | |
| 4 | 11 | |
| 5 | 24 | |
| 6 | 16 | |
| 7 | 28 | |
| 8 | 7 | |
| 9 | 15 | |
| 10 | Dynamics of a Multi-Phase Interstellar Medium | 2 |
| 11 | 45 | |
| 12 | 3 | |
| 13 | 3 | |
| 14 | 13 | |
| 15 | 9 | |
| 16 | Comparison of Percutaneous Transhepatic Protograms obtained before and after Eradicative Endoscopic Variceal Ligation of Esophageal Varices. | 1 |
| 17 | 21 | |
| 18 | 2 | |
| 19 | 7 | |
| 20 | 2 |
About Hiroshi Koyama
Hiroshi Koyama is a scholar working on Astronomy and Astrophysics, Electrical and Electronic Engineering and Surfaces, Coatings and Films, having authored 90 papers that have together received 1.4k indexed citations. Recurring topics across this work include Semiconductor materials and devices (20 papers), Integrated Circuits and Semiconductor Failure Analysis (15 papers) and Astrophysics and Star Formation Studies (10 papers). The work is most often cited by research in Astronomy and Astrophysics (249 citations), Atmospheric Science (139 citations) and Global and Planetary Change (141 citations). Hiroshi Koyama has collaborated with scholars based in Japan, United States and Germany. Frequent co-authors include Shu‐ichiro Inutsuka, Eve C. Ostriker, DM Geddes, Tomikichi Wada, Satoshi Naito, Kaoru Yoshida, Masahiro Watanabe, Kazuhisa Sekimizu, Takahiro Ito and Toshiyuki Nakanishi. Their work appears in journals such as Circulation, Journal of Applied Physics and The Astrophysical Journal.
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.