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University · Tokyo · Japan

Nihon University

In research, Nihon University stands highest in Medicine (#919 of 10,443 worldwide), Health Sciences (#1,132 of 11,982 worldwide) and Physical Sciences (#3,446 of 12,888 worldwide), 2022–2025. Relative to its size it is most specialised in Complementary and Manual Therapy, Orthodontics and Dentistry — Complementary and Manual Therapy is 15.5× its share of world research.

nihon-u.ac.jpROR OpenAlex
World rank, 2022–2025
#2,862
of 28,054 · #1,722 all time
Rank in Japan
#48
of 1,070
Research works
38k
▼ 5% vs 2013–17
Citations
418k
11.0 per fractional work
Top-10% rate
7.0%
record average 16.5%
Open access
52%
world 28%

What is Nihon University 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
MedicineField #919 of 10,443 8.7%1,147 #1268
Health SciencesDomain #1,132 of 11,982 8.4%1,397 #1178
Physical SciencesDomain #3,446 of 12,888 4.4%1,321 #1607
Life SciencesDomain #2,285 of 7,800 6.9%541 #1586
Social SciencesDomain #3,785 of 10,521 10.6%396 #3199
EngineeringField #2,640 of 6,636 3.8%572 #1599
Health ProfessionsField #870 of 1,928 5.4%79 #524
Computer ScienceField #2,288 of 4,667 3.7%166 #1806
Cardiology and Cardiovascular MedicineSubfield #406 of 738 12.3%100 #720
SurgerySubfield #1,043 of 1,816 6.7%159 #858

Each strip is that field’s whole ranked pool, with the notch where Nihon University 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).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022–2025. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Medicine#1,268 #919
  2. Health Sciences#1,178 #1,132
  3. Physical Sciences#1,607 #3,446
  4. Life Sciences#1,586 #2,285
  5. Social Sciences#3,199 #3,785
  6. Engineering#1,599 #2,640
  7. Health Professions#524 #870
  8. Computer Science#1,806 #2,288
  9. Cardiology and Cardiovascular Medicine#720 #406
  10. Surgery#858 #1,043
all time2022–2025, better2022–2025, worse

A dot further right is a better standing. Fields it was not ranked in over the whole record are left out.

What does Nihon University specialise in?

Where its research is concentrated relative to its size: Complementary and Manual Therapy takes 15.5× the share of its output that it takes of world research.

  1. Complementary and Manual TherapySubfield · 23.7 works16×
  2. OrthodonticsSubfield · 40.6 works9.9×
  3. DentistryField · 137.9 works7.8×
  4. PeriodonticsSubfield · 38.0 works7.6×
  5. Oral SurgerySubfield · 51.6 works7.3×
← less than its size predicts1×more →

Location quotient, a volume reading rather than an impact one. It surfaces small, lopsided specialities.

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: 0.53× its world share, 93 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 1.41× its world share, 275 worksBiochemistry, Geneti…Immunology and Microbiology: 1.71× its world share, 63 worksImmunology and Micro…Neuroscience: 1.55× its world share, 92 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 1.43× its world share, 18 worksPharmacology, Toxico…Chemical Engineering: 1.92× its world share, 25 worksChemical EngineeringChemistry: 0.93× its world share, 53 worksChemistryComputer Science: 0.58× its world share, 166 worksComputer ScienceEarth and Planetary Sciences: 0.68× its world share, 39 worksEarth and Planetary …Energy: 0.49× its world share, 17 worksEnergyEngineering: 1.04× its world share, 572 worksEngineeringEnvironmental Science: 0.78× its world share, 142 worksEnvironmental ScienceMaterials Science: 0.97× its world share, 124 worksMaterials ScienceMathematics: 1.49× its world share, 64 worksMathematicsPhysics and Astronomy: 1.48× its world share, 120 worksPhysics and AstronomyDentistry: 7.77× its world share, 138 worksDentistryHealth Professions: 0.82× its world share, 79 worksHealth ProfessionsMedicine: 1.63× its world share, 1,147 worksMedicineNursing: 1.14× its world share, 20 worksNursingVeterinary: 2.60× its world share, 13 worksVeterinaryArts and Humanities: 0.34× its world share, 36 worksArts and HumanitiesBusiness, Management and Accounting: 0.38× its world share, 45 worksBusiness, Management…Decision Sciences: 0.32× its world share, 11 worksDecision SciencesEconomics, Econometrics and Finance: 0.67× its world share, 53 worksEconomics, Econometr…Psychology: 0.73× its world share, 82 worksPsychologySocial Sciences: 0.37× its world share, 169 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Dentistry, 7.8×. Every wedge is a field page.

Who are the top researchers at Nihon University?

Ranked on the composite score, Akira Kawaoi, Naohiro Ogawa and Noriko Nakajima lead among researchers whose main affiliation is Nihon University.

  1. 1 Akira Kawaoi · #44,473 worldwide 424 citations · 32 works
  2. 2 Naohiro Ogawa · #49,254 worldwide 136 citations · 45 works
  3. 3 Noriko Nakajima · #49,759 worldwide 205 citations · 41 works
  4. 4 Shori Takahashi · #112,139 worldwide 257 citations · 24 works
  5. 5 Yoshimichi Okayama · #115,867 worldwide 99 citations · 29 works
  6. 6 Takuji Gotoda · #117,527 worldwide 241 citations · 81 works
  7. 7 Takashi Tsuno · #132,208 worldwide 218 citations · 33 works
  8. 8 Ken Yasukawa · #135,611 worldwide 155 citations · 28 works
  9. 9 Toshio Shikata · #136,150 worldwide 217 citations · 91 works
  10. 10 Masashi Miyazaki · #141,561 worldwide 144 citations · 40 works
All ranked researchers at Nihon University

Which keywords describe research at Nihon University?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Epidemiology, Inflammation, Treatment, Diagnostic Criteria, Quality of Life, Diagnosis, Diabetes Mellitus and Ecosystem Management.

▲ 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. Epidemiology257▲ 1.78×123 topics
  2. Inflammation150▲ 1.97×80 topics
  3. Treatment93▲ 2.1×44 topics
  4. Quality of Life86▲ 1.63×47 topics
  5. Diagnosis70▲ 2.1×38 topics
  6. Oxidative Stress68◆ 1.14×55 topics
  7. Cardiovascular Disease66▲ 1.62×34 topics
  8. Cancer61▲ 1.24×52 topics
  9. Risk Factors56▲ 1.40×31 topics
  10. Immunotherapy50▲ 1.94×19 topics
  11. Biodiversity49▲ 1.81×24 topics
  12. Heart Failure48▲ 3.0×13 topics
  13. Management47▲ 1.65×32 topics
  14. Diagnostic Criteria46▲ 5.7×10 topics
  15. Clinical Trials45▲ 1.84×17 topics
  16. Chemotherapy44▲ 1.71×24 topics
  17. Surgical Management43▲ 2.9×19 topics
  18. Diabetes Mellitus42▲ 5.7×7 topics
  19. Clinical Practice Guidelines41▲ 2.1×14 topics
  20. Community Participation35▲ 2.6×4 topics
  21. Ecosystem Management35▲ 16×2 topics
  22. Satoyama34▲ 94×1 topic
  23. landscape conservation34▲ 94×1 topic
  24. Echocardiography34▲ 3.4×8 topics
  25. Dental Caries33▲ 9.2×2 topics
  26. Psychological Factors32▲ 4.2×6 topics
  27. Catheter Ablation31▲ 7.0×2 topics
  28. Microbial Ecology26▲ 4.1×3 topics
  29. Bone Regeneration26▲ 5.9×2 topics
  30. Bacterial Diversity25▲ 6.0×2 topics
  31. Radiofrequency Ablation25▲ 6.4×2 topics
  32. Inflammatory Pathways24▲ 9.9×2 topics
  33. Oral Microbiome24▲ 11×1 topic
  34. Periodontal Diseases24▲ 11×1 topic
  35. Bruxism23▲ 23×1 topic
  36. Temporomandibular Disorders23▲ 23×1 topic
  37. Molecular Pathology22▲ 5.8×4 topics
  38. Arrhythmias22▲ 6.6×2 topics
  39. Dental Implants20▲ 11×1 topic
  40. Peri-implant Diseases20▲ 11×1 topic

Which research topics does Nihon University publish most on?

By volume in 2022–2025: Urban and spatial planning, Oral microbiology and periodontitis research, Temporomandibular Joint Disorders and Dental Implant Techniques and Outcomes.

Urban and spatial planning34Urban and spatial planning: 34 fractional worksOral microbiology and pe…24Oral microbiology and periodontitis research: 24 fractional worksTemporomandibular Joint …23Temporomandibular Joint Disorders: 23 fractional worksDental Implant Technique…20Dental Implant Techniques and Outcomes: 20 fractional worksDental materials and restorations: 19 fractional worksAtrial Fibrillation Management and Outcomes: 16 fractional worksCardiac Arrhythmias and …15Cardiac Arrhythmias and Treatments: 15 fractional worksLiver Disease Diagnosis and Treatment: 12 fractional worksCardiac Imaging and Diagnostics: 12 fractional worksOrthodontics and Dentofacial Orthopedics: 12 fractional works
Nature and Landscape ConservationPeriodonticsComplementary and Manual TherapyOral Surgery4 others

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

  1. 1 Urban and spatial planningNature and Landscape Conservation 34 works
  2. 2 Oral microbiology and periodontitis researchPeriodontics 24 works
  3. 3 Temporomandibular Joint DisordersComplementary and Manual Therapy 23 works
  4. 4 Dental Implant Techniques and OutcomesOral Surgery 20 works
  5. 5 Dental materials and restorationsOrthodontics 19 works
  6. 6 Atrial Fibrillation Management and OutcomesCardiology and Cardiovascular Medicine 16 works
  7. 7 Cardiac Arrhythmias and TreatmentsCardiology and Cardiovascular Medicine 15 works
  8. 8 Liver Disease Diagnosis and TreatmentEpidemiology 12 works
  9. 9 Cardiac Imaging and DiagnosticsRadiology, Nuclear Medicine and Imaging 12 works
  10. 10 Orthodontics and Dentofacial OrthopedicsOrthodontics 12 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 available51.8%not open48.2%

World: 28% of research is openly available.

with international co-authors9.2%domestic only90.8%

World: 19% is written across borders.

How has Nihon University's research output changed?

Output in 2018–2022 was 5% lower 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.