This map shows the geographic impact of Osamu Hirota'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 Osamu Hirota with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Osamu Hirota more than expected).
This network shows the impact of papers produced by Osamu Hirota. 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 Osamu Hirota. The network helps show where Osamu Hirota may publish in the future.
Co-authorship network of co-authors of Osamu Hirota
This figure shows the co-authorship network connecting the top 25 collaborators of Osamu Hirota.
A scholar is included among the top collaborators of Osamu Hirota 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 Osamu Hirota. Osamu Hirota is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Futami, Fumio & Osamu Hirota. (2014). 100 Gbit/s (10 x 10 Gbit/s) Y-00 cipher transmission over 120 km for secure optical fiber communication between data centers. Australian Conference on Optical Fibre Technology. 4–6.20 indexed citations
4.
Hirota, Osamu. (2013). Cyber Attack Against Optical Communication System and Its Defense Technology -- Towards Development of Quantum Enigma Cipher. IEICE Technical Report; IEICE Tech. Rep.. 113(90). 43–48.2 indexed citations
5.
Futami, Fumio & Osamu Hirota. (2012). Transmission of Y-00 quantum cipher from transmitter using directly modulated DFB laser for secure access networks. International Conference on Photonics in Switching. 1–3.4 indexed citations
6.
Futami, Fumio & Osamu Hirota. (2011). Experimental observation of masking Y-00 cipher signal levels by intensity noise. 9–10.2 indexed citations
Hirota, Osamu, et al.. (2008). Consideration of the Implementation Circuit of Randomization for Physical Cipher by Yuen 2000 Protocol. 91(8). 399–408.4 indexed citations
9.
Hirota, Osamu. (2004). Optical Communication Network and Quantum Cryptography. 87(4). 478–486.2 indexed citations
10.
Barnett, Stephen M., Erika Andersson, John Jeffers, Patrik Öhberg, & Osamu Hirota. (2004). Quantum Communication, Measurement and Computing. 734.66 indexed citations
11.
Hirota, Osamu, et al.. (2001). Effects of Nitrogen Fertilizer Levels and Planting Density on Growth and Yield of Long Grain Rice. 24. 1–10.1 indexed citations
12.
Haraguchi, Tomokazu, et al.. (2000). Growth Analysis, Yield and Canopy Structure in Maize-mungbean Intercropping. 23. 61–69.21 indexed citations
13.
Hirota, Osamu, et al.. (1996). Response of Mungbean to Irrigation Frequency and Irrigation Water Volume Applied during Pod Formation Stage. 19. 9–15.1 indexed citations
Hirota, Osamu, et al.. (1994). Soil Physical Characteristics and Soil Water Pressure Measured using a Tensiometer at the Experimental Field of Old Alluvium Soil in Bangladesh. 17. 33–41.1 indexed citations
Hirota, Osamu, et al.. (1988). Relationship between canopy architecture and crop production with reference to light and CO2 environments. V. Effects of the canopy height on foliage photosynthesis of grain sorghum stands. 42(3). 137–151.1 indexed citations
18.
Hirota, Osamu, et al.. (1987). Comparison between Photon Communication Systems and Quantum Coherent Communication Systems. IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences. 70(9). 835–840.1 indexed citations
19.
Hirota, Osamu & Y. Suematsu. (1982). Quantum intensity noise of directly modulated laser diode influenced by reflected waves. IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences. 65(2). 94–101.5 indexed citations
20.
Hirota, Osamu, et al.. (1982). Minimax Strategy in the Quantum Detection Theory and Its Application to Optical Communications. IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences. 65(11). 627–633.14 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.