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Company · Tokyo · Japan

Nippon Koei (Japan)

In research, Nippon Koei (Japan) stands highest in Physical Sciences (#11,528 of 12,888 worldwide), 2022–2025.

n-koei.co.jp/englishROR OpenAlex
World rank, 2022–2025
#23,004
of 28,054 · #12,445 all time
Rank in Japan
#737
of 1,070
Research works
1.5k
▲ 31% vs 2013–17
Citations
15k
9.5 per fractional work
Top-10% rate
6.1%
record average 16.5%
Open access
50%
world 28%

What is Nippon Koei (Japan) known for in research?

The fields where it stands highest, 2022–2025, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
Physical SciencesDomain #11,528 of 12,888 6.2%78 #7726

Each strip is that field’s whole ranked pool, with the notch where Nippon Koei (Japan) sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no world mark, because the world rate differs by field (from about 6% to 21% in this record).

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.97× its world share, 6 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.29× its world share, 2 worksBiochemistry, Geneti…Immunology and Microbiology: 0.60× its world share, 1 worksImmunology and Micro…Neuroscience: 0.17× its world share, 0 worksNeuroscienceChemistry: 0.29× its world share, 1 worksChemistryComputer Science: 0.15× its world share, 1 worksComputer ScienceEarth and Planetary Sciences: 6.14× its world share, 12 worksEarth and Planetary …Energy: 1.56× its world share, 2 worksEnergyEngineering: 1.80× its world share, 33 worksEngineeringEnvironmental Science: 4.26× its world share, 26 worksEnvironmental ScienceMaterials Science: 0.40× its world share, 2 worksMaterials SciencePhysics and Astronomy: 0.68× its world share, 2 worksPhysics and AstronomyHealth Professions: 0.15× its world share, 0 worksHealth ProfessionsMedicine: 0.81× its world share, 19 worksMedicineNursing: 1.86× its world share, 1 worksNursingArts and Humanities: 0.34× its world share, 1 worksArts and HumanitiesBusiness, Management and Accounting: 0.47× its world share, 2 worksBusiness, Management…Decision Sciences: 0.54× its world share, 1 worksDecision SciencesEconomics, Econometrics and Finance: 1.22× its world share, 3 worksEconomics, Econometr…Psychology: 0.27× its world share, 1 worksPsychologySocial Sciences: 0.46× its world share, 7 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Earth and Planetary Sciences, 6.1×. Every wedge is a field page.

Who are the top researchers at Nippon Koei (Japan)?

Ranked on the composite score, Toshiaki Kozu, Takeshi Ichikawa and Chiaki Ouchi lead among researchers whose main affiliation is Nippon Koei (Japan).

  1. 1 Toshiaki Kozu Japan · #121,509 worldwide 271 citations · 39 works
  2. 2 Takeshi Ichikawa Japan · #786,786 worldwide 25 citations · 27 works
  3. 3 Chiaki Ouchi Japan · #793,981 worldwide 72 citations · 28 works
  4. 4 Masaaki Nakano Japan · #1,100,769 worldwide 37 citations · 24 works
  5. 5 Kiyomi TAGUCHI Japan · #1,399,780 worldwide 8 citations · 15 works
  6. 6 Masaaki SAKURABA Japan · #1,462,134 worldwide 17 citations · 28 works
  7. 7 Iwao Matsushima Japan · #1,533,686 worldwide 23 citations · 23 works
All ranked researchers at Nippon Koei (Japan)

Which keywords describe research at Nippon Koei (Japan)?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Climate Change, Remote Sensing, GIS-based Modeling, Hazard, Landslide, Risk Assessment, Hydrological Modeling and Sediment Transport.

▲ more of its work than of the world’s◆ about the world’s share▼ less than the world’s

Size is fractional works in 2022–2025 in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Climate Change17▲ 5.3×39 topics
  2. Remote Sensing12▲ 8.0×15 topics
  3. GIS-based Modeling5▲ 46×2 topics
  4. Risk Assessment5▲ 5.7×2 topics
  5. Sustainability5▲ 1.55×14 topics
  6. Hazard4▲ 53×1 topic
  7. Landslide4▲ 53×1 topic
  8. Hydrological Modeling4▲ 13×4 topics
  9. Sediment Transport4▲ 18×4 topics
  10. Land Use Change3▲ 8.0×3 topics
  11. Community Resilience3▲ 13×2 topics
  12. Disaster Recovery3▲ 302×1 topic
  13. Global Warming3▲ 5.6×7 topics
  14. Urban Reconstruction3▲ 302×1 topic
  15. Disaster Management3▲ 15×2 topics
  16. Risk Perception3▲ 8.3×3 topics
  17. Flood Risk2▲ 27×1 topic
  18. Surface Water Mapping2▲ 28×1 topic
  19. Water Quality2▲ 5.2×7 topics
  20. Geosynthetics2▲ 39×2 topics
  21. Physical Function2▲ 13×2 topics
  22. Prognosis2▲ 5.8×4 topics
  23. Sea Level Rise2▲ 15×3 topics
  24. Sea-Level Rise2▲ 16×4 topics
  25. Nutritional Status2▲ 19×2 topics
  26. Soil Reinforcement2▲ 28×2 topics
  27. Cancer Cachexia2▲ 20×1 topic
  28. Global Carbon Budget2▲ 23×2 topics
  29. Liquefaction2▲ 19×2 topics
  30. Population Dynamics2▲ 6.7×5 topics
  31. Sarcopenia2▲ 20×1 topic
  32. Tunnel2▲ 19×2 topics
  33. Hepatic Encephalopathy2▲ 30×1 topic
  34. Hydrology2▲ 13×3 topics
  35. Liver Cirrhosis2▲ 30×1 topic
  36. NAFLD2▲ 14×1 topic
  37. NASH2▲ 14×1 topic
  38. Construction2▲ 12×2 topics
  39. Fiber Reinforcement2▲ 25×1 topic
  40. Stone Columns2▲ 36×1 topic

Which research topics does Nippon Koei (Japan) publish most on?

By volume in 2022–2025: Landslides and related hazards, Earthquake and Disaster Impact Studies, Flood Risk Assessment and Management and Nutrition and Health in Aging.

Landslides and related hazards: 4 fractional worksEarthquake and Disaster Impact Studies: 3 fractional worksFlood Risk Assessment and Management: 2 fractional worksNutrition and Health in Aging: 2 fractional worksLiver Disease and Transplantation: 2 fractional worksLiver Disease Diagnosis and Treatment: 2 fractional worksGeotechnical Engineering…2Geotechnical Engineering and Soil Stabilization: 2 fractional worksSoil erosion and sediment transport: 2 fractional worksGeotechnical Engineering and Underground Structures: 2 fractional worksGeotechnical Engineering…2Geotechnical Engineering and Soil Mechanics: 2 fractional works
Management, Monitoring, Policy and LawTransportationGlobal and Planetary ChangePhysiology4 others

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Landslides and related hazards Management, Monitoring, Policy and Law 4 works
  2. 2 Earthquake and Disaster Impact Studies Transportation 3 works
  3. 3 Flood Risk Assessment and Management Global and Planetary Change 2 works
  4. 4 Nutrition and Health in Aging Physiology 2 works
  5. 5 Liver Disease and Transplantation Hepatology 2 works
  6. 6 Liver Disease Diagnosis and Treatment Epidemiology 2 works
  7. 7 Geotechnical Engineering and Soil Stabilization Civil and Structural Engineering 2 works
  8. 8 Soil erosion and sediment transport Soil Science 2 works
  9. 9 Geotechnical Engineering and Underground Structures Civil and Structural Engineering 2 works
  10. 10 Geotechnical Engineering and Soil Mechanics Civil and Structural Engineering 2 works

How open and international is its research?

Against the world’s own shares — the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available50.0%not open50.0%

World: 28% of research is openly available.

with international co-authors11.6%domestic only88.4%

World: 19% is written across borders.

How has Nippon Koei (Japan)'s research output changed?

Output in 2018–2022 was 31% higher than in 2013–2017.

1990200020102020
grewheldshrank

The same series as a ribbon — one cell per year, darker for more. The line above answers how much; this answers when.

Other research institutions in Tokyo

All research institutions in Tokyo

Research measures only: rankings here say nothing about teaching, admissions or student experience. Comparable institutions and collaboration partners are in the interactive view on the map.