Koujun Yamashita

2.7k total citations
68 papers, 521 citations indexed

About

Koujun Yamashita is a scholar working on Astronomy and Astrophysics, Radiation and Computational Mechanics. According to data from OpenAlex, Koujun Yamashita has authored 68 papers receiving a total of 521 indexed citations (citations by other indexed papers that have themselves been cited), including 37 papers in Astronomy and Astrophysics, 28 papers in Radiation and 13 papers in Computational Mechanics. Recurrent topics in Koujun Yamashita's work include Astrophysical Phenomena and Observations (28 papers), Advanced X-ray Imaging Techniques (23 papers) and X-ray Spectroscopy and Fluorescence Analysis (16 papers). Koujun Yamashita is often cited by papers focused on Astrophysical Phenomena and Observations (28 papers), Advanced X-ray Imaging Techniques (23 papers) and X-ray Spectroscopy and Fluorescence Analysis (16 papers). Koujun Yamashita collaborates with scholars based in Japan, United States and India. Koujun Yamashita's co-authors include Yuzuru Tawara, Hideyo Kunieda, Akihiro Furuzawa, Yasushi Ogasaka, Keisuke Tamura, Yoshiyuki Tsusaka, Takashi Okajima, Y. Ikebe, Yoshiharu Namba and Maxim Markevitch and has published in prestigious journals such as Nature, The Astrophysical Journal and Monthly Notices of the Royal Astronomical Society.

In The Last Decade

Koujun Yamashita

65 papers receiving 505 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Koujun Yamashita Japan 13 363 138 105 62 61 68 521
Yasushi Ogasaka Japan 11 374 1.0× 130 0.9× 178 1.7× 73 1.2× 55 0.9× 74 519
Wolfgang Burkert Germany 11 327 0.9× 203 1.5× 110 1.0× 53 0.9× 50 0.8× 62 463
Hideyo Kunieda Japan 15 564 1.6× 216 1.6× 205 2.0× 99 1.6× 75 1.2× 117 795
H. Bräuninger Germany 13 265 0.7× 233 1.7× 172 1.6× 82 1.3× 61 1.0× 70 569
Yang Soong United States 11 404 1.1× 154 1.1× 149 1.4× 59 1.0× 50 0.8× 58 503
Akihiro Furuzawa Japan 15 487 1.3× 96 0.7× 187 1.8× 27 0.4× 25 0.4× 70 581
P. Gondoin Netherlands 11 309 0.9× 66 0.5× 58 0.6× 56 0.9× 35 0.6× 52 419
N. J. Westergaard Denmark 13 496 1.4× 153 1.1× 293 2.8× 37 0.6× 35 0.6× 86 654
Ikuyuki Mitsuishi Japan 12 250 0.7× 109 0.8× 99 0.9× 141 2.3× 29 0.5× 67 448
Andrew P. Rasmussen United States 14 488 1.3× 78 0.6× 179 1.7× 47 0.8× 33 0.5× 26 644

Countries citing papers authored by Koujun Yamashita

Since Specialization
Citations

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

Fields of papers citing papers by Koujun Yamashita

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Koujun Yamashita

This figure shows the co-authorship network connecting the top 25 collaborators of Koujun Yamashita. A scholar is included among the top collaborators of Koujun Yamashita 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 Koujun Yamashita. Koujun Yamashita 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.
Yamane, Takashi, Yoshikazu Takeda, Kazuo Soda, et al.. (2007). Nagoya University Photo-Science Nanofactory Project. AIP conference proceedings. 879. 75–78. 1 indexed citations
2.
Miyazawa, Takuya, Ryo Shibata, Yasushi Ogasaka, et al.. (2006). Development and performance of the advanced hard x-ray telescope for the balloon experiment. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 6266. 62663C–62663C. 1 indexed citations
3.
Owens, Scott M., P. J. Serlemitsos, Jack Tueller, et al.. (2003). Production and performance of the inFOCmicroS 20-40-keV graded multilayer mirror.. PubMed. 42(10). 1856–66. 2 indexed citations
4.
Ogasaka, Yasushi, Keisuke Tamura, Takashi Okajima, et al.. (2000). <title>Development of a balloonborne hard x-ray telescope using a Pt/C multilayer supermirror</title>. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 4012. 294–305. 2 indexed citations
5.
Namba, Yoshiharu, Jin Yu, Jean M. Bennett, & Koujun Yamashita. (2000). Modeling and measurements of atomic surface roughness. Applied Optics. 39(16). 2705–2705. 10 indexed citations
6.
Lodha, G. S., Amitesh Paul, Satish Vitta, et al.. (1999). Study of Pt/C X-Ray Multilayer Structure as a Function of Layer Perid Using X-Ray Scattering. Japanese Journal of Applied Physics. 38(S1). 289–289. 3 indexed citations
7.
Lodha, G. S., Koujun Yamashita, Hideyo Kunieda, et al.. (1998). Effect of surface roughness and subsurface damage on grazing-incidence x-ray scattering and specular reflectance. Applied Optics. 37(22). 5239–5239. 18 indexed citations
8.
Furuzawa, Akihiro, Koujun Yamashita, Hideyo Kunieda, et al.. (1998). Replication of a multilayer supermirror. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 3444. 576–576. 3 indexed citations
9.
Tsunemi, H., et al.. (1997). An Observation of Diffuse Soft X-Ray Background and Distribution of Hot Interstellar Medium. Astrophysics and Space Science. 250(1). 53–73. 1 indexed citations
10.
Fukazawa, Yasushi, Kazuo Makishima, Kyoko Matsushita, et al.. (1996). Metal Abundance of an X-Ray Emitting Gas in Two Groups of Galaxies: The NGC 5044 Group and HCG 51. Publications of the Astronomical Society of Japan. 48(3). 395–407. 25 indexed citations
11.
Fukazawa, Yasushi, Takaya Ohashi, A. C. Fabian, et al.. (1994). Metal Concentration and X-Ray Cool Spectral Component in the Central Region of the Centaurus Cluster of Galaxies. Publications of the Astronomical Society of Japan. 46(3). L55–L58. 4 indexed citations
12.
Markevitch, Maxim, Koujun Yamashita, Akihiro Furuzawa, & Yuzuru Tawara. (1994). Nonisothermality of the hottest cluster Abell 2163. The Astrophysical Journal. 436. L71–L71. 27 indexed citations
13.
Yamaoka, H., Tomoya Uruga, Y. Sakurai, et al.. (1993). <title>Development and characterization of large x-ray mirrors for high-brilliance synchrotron radiation</title>. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 1997. 369–377. 2 indexed citations
14.
Nakamura, Masato, Tatsundo Yamamoto, K. Tsuruda, et al.. (1993). <title>Interplanetary He II extreme-ultraviolet observation on PLANET-B</title>. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 2008. 35–39. 2 indexed citations
15.
Kunieda, Hideyo, Yoshiyuki Tsusaka, H. Suzuki, et al.. (1993). Thirty-Meter X-Ray Pencil Beam Line at the Institute of Space and Astronautical Science. Japanese Journal of Applied Physics. 32(10R). 4805–4805. 8 indexed citations
16.
Hughes, John P., et al.. (1988). Isothermality of the gas in the Coma cluster. The Astrophysical Journal. 327. 615–615. 23 indexed citations
17.
Yamashita, Koujun. (1986). Application of multilayer reflector to X-ray telescope, spectrometer and polarimeter. 2. 1865–1869. 1 indexed citations
18.
Kunieda, Hideyo, Satio Hayakawa, Tatsumi Hirano, et al.. (1986). Roughness Measurement of X-Ray Mirror Surfaces. Japanese Journal of Applied Physics. 25(9R). 1292–1292. 22 indexed citations
19.
Hirano, Tatsumi, S. Hayakawa, Hideyo Kunieda, et al.. (1985). Energy Spectra and Time Variations of the X-Ray Source Cygnus X-2. Publications of the Astronomical Society of Japan. 36(4). 769–784. 2 indexed citations
20.
Murakami, Toshio, Hajime Inoue, Katsuji Koyama, et al.. (1980). Two Successive X-Ray Bursts at Ten-Minute Interval from 1608—522. Publications of the Astronomical Society of Japan. 32(3). 543–546. 4 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Yasushi Ogasaka Breakdown of academic impact, for papers by Wolfgang Burkert Breakdown of academic impact, for papers by Hideyo Kunieda Breakdown of academic impact, for papers by H. Bräuninger Breakdown of academic impact, for papers by Yang Soong Breakdown of academic impact, for papers by Akihiro Furuzawa Breakdown of academic impact, for papers by P. Gondoin Breakdown of academic impact, for papers by N. J. Westergaard Breakdown of academic impact, for papers by Ikuyuki Mitsuishi Breakdown of academic impact, for papers by Andrew P. Rasmussen
Rankless by CCL
2026