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Nonprofit · Tokyo · Japan

ClassNK

In research, ClassNK stands highest in Physical Sciences (#17,348 of 21,541 worldwide) and Engineering (#10,306 of 11,412 worldwide), over all time.

classnk.or.jp/hp/ja/index.htmlROR OpenAlex
World rank, all time
#31,460
of 42,892
Rank in Japan
#1,301
of 2,112
Research works
379
▲ 66% vs 2013–17
Citations
2.7k
7.0 per fractional work
Top-10% rate
20.1%
record average 16.5%
Open access
39%
world 28%

What is ClassNK known for in research?

The fields where it stands highest, over all time, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorks
Physical SciencesDomain #17,348 of 21,541 6.8%285
EngineeringField #10,306 of 11,412 6.7%192

Each strip is that field’s whole ranked pool, with the notch where ClassNK 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: 0.66× its world share, 2 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.10× its world share, 0 worksBiochemistry, Geneti…Immunology and Microbiology: 0.47× its world share, 0 worksImmunology and Micro…Chemical Engineering: 1.62× its world share, 0 worksChemical EngineeringChemistry: 0.06× its world share, 0 worksChemistryComputer Science: 0.66× its world share, 3 worksComputer ScienceEarth and Planetary Sciences: 5.32× its world share, 5 worksEarth and Planetary …Engineering: 2.49× its world share, 22 worksEngineeringEnvironmental Science: 1.46× its world share, 4 worksEnvironmental ScienceMaterials Science: 0.51× its world share, 1 worksMaterials ScienceMathematics: 1.20× its world share, 1 worksMathematicsHealth Professions: 0.98× its world share, 2 worksHealth ProfessionsMedicine: 0.27× its world share, 3 worksMedicineArts and Humanities: 1.03× its world share, 2 worksArts and HumanitiesBusiness, Management and Accounting: 0.26× its world share, 0 worksBusiness, Management…Decision Sciences: 1.09× its world share, 1 worksDecision SciencesEconomics, Econometrics and Finance: 2.07× its world share, 3 worksEconomics, Econometr…Psychology: 0.34× its world share, 1 worksPsychologySocial Sciences: 1.24× its world share, 9 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Earth and Planetary Sciences, 5.3×. Every wedge is a field page.

Who are the top researchers at ClassNK?

Ranked on the composite score, Norio Yamamoto, Koji UKEGAWA and Tatsuro Nakai lead among researchers whose main affiliation is ClassNK.

  1. 1 Norio Yamamoto Japan · #988,804 worldwide 62 citations · 63 works
  2. 2 Koji UKEGAWA Japan · #1,192,049 worldwide 40 citations · 20 works
  3. 3 Tatsuro Nakai Japan · #1,202,792 worldwide 36 citations · 17 works
  4. 4 Hisao Matsushita Japan · #1,253,315 worldwide 36 citations · 24 works
All ranked researchers at ClassNK

Which keywords describe research at ClassNK?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Pedagogy, Teaching Methods, Corrosion, Finite Element Analysis, Numerical Simulation, Pipeline, Steel Structures and Tropical Cyclones.

▲ 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. Pedagogy4▲ 13×1 topic
  2. Teaching Methods4▲ 46×1 topic
  3. Corrosion3▲ 46×3 topics
  4. Finite Element Analysis3▲ 24×4 topics
  5. Climate Change3▲ 2.0×7 topics
  6. Numerical Simulation3▲ 16×5 topics
  7. Environmental Impact3▲ 2.6×6 topics
  8. Pipeline3▲ 40×2 topics
  9. Steel Structures3▲ 113×2 topics
  10. Pitting Corrosion2▲ 83×2 topics
  11. Risk Analysis2▲ 41×2 topics
  12. Tropical Cyclones2▲ 78×2 topics
  13. Offshore2▲ 233×1 topic
  14. Reliability Assessment2▲ 94×1 topic
  15. Maritime Transportation2▲ 70×2 topics
  16. CFD Simulations2▲ 272×1 topic
  17. Ship Maneuvering2▲ 272×1 topic
  18. Fluid-Structure Interaction2▲ 22×3 topics
  19. Risk Assessment2▲ 4.7×3 topics
  20. Shipping2▲ 65×2 topics
  21. Wave Modeling2▲ 62×2 topics
  22. Air Quality2▲ 16×2 topics
  23. Climate Change Impact2▲ 13×2 topics
  24. International Relations2▲ 13×2 topics
  25. Ocean Waves2▲ 129×1 topic
  26. SPH Method2▲ 99×1 topic
  27. Smoothed Particle Hydrodynamics2▲ 99×1 topic
  28. Wind Stress2▲ 129×1 topic
  29. Emissions1▲ 12×2 topics
  30. Fuel Consumption1▲ 33×2 topics
  31. Boundary Layer1▲ 18×2 topics
  32. Collision Avoidance1▲ 12×2 topics
  33. Data Assimilation1▲ 14×2 topics
  34. Fatigue Crack Closure1▲ 75×1 topic
  35. Fracture Toughness Testing1▲ 75×1 topic
  36. Human Factors1▲ 29×2 topics
  37. Nation-Building1▲ 42×2 topics
  38. Irrigation1▲ 137×1 topic
  39. Nonlinear Dynamics1▲ 9.2×2 topics
  40. Water Efficiency1▲ 137×1 topic

Which research topics does ClassNK publish most on?

By volume in 2022–2025: Education, Innovation and Language Studies, Structural Integrity and Reliability Analysis, Ship Hydrodynamics and Maneuverability and Fluid Dynamics Simulations and Interactions.

Education, Innovation an…4Education, Innovation and Language Studies: 4 fractional worksStructural Integrity and Reliability Analysis: 2 fractional worksShip Hydrodynamics and M…2Ship Hydrodynamics and Maneuverability: 2 fractional worksFluid Dynamics Simulatio…2Fluid Dynamics Simulations and Interactions: 2 fractional worksOcean Waves and Remote Sensing: 2 fractional worksEducational Methods and Media Use: 1 fractional worksFatigue and fracture mec…1Fatigue and fracture mechanics: 1 fractional worksEngineering and Agricultural Innovations: 1 fractional worksMaritime Transport Emissions and Efficiency: 1 fractional worksMaritime Navigation and Safety: 1 fractional works
EducationMechanical EngineeringOcean EngineeringComputational Mechanics5 others

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

  1. 1 Education, Innovation and Language Studies Education 4 works
  2. 2 Structural Integrity and Reliability Analysis Mechanical Engineering 2 works
  3. 3 Ship Hydrodynamics and Maneuverability Ocean Engineering 2 works
  4. 4 Fluid Dynamics Simulations and Interactions Computational Mechanics 2 works
  5. 5 Ocean Waves and Remote Sensing Oceanography 2 works
  6. 6 Educational Methods and Media Use Information Systems 1 works
  7. 7 Fatigue and fracture mechanics Mechanics of Materials 1 works
  8. 8 Engineering and Agricultural Innovations Aquatic Science 1 works
  9. 9 Maritime Transport Emissions and Efficiency Environmental Engineering 1 works
  10. 10 Maritime Navigation and Safety Ocean Engineering 1 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 available38.7%not open61.3%

World: 28% of research is openly available.

with international co-authors14.1%domestic only85.9%

World: 19% is written across borders.

How has ClassNK's research output changed?

Output in 2018–2022 was 66% 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.