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University · Matsuyama · Japan

Ehime University

In research, Ehime University stands highest in Medicine (#2,473 of 10,443 worldwide), Health Sciences (#3,475 of 11,982 worldwide) and Life Sciences (#2,410 of 7,800 worldwide), 2022–2025. Relative to its size it is most specialised in Hepatology and Geophysics — Hepatology is 5.8× its share of world research.

ehime-u.ac.jp/englishROR OpenAlex
World rank, 2022–2025
#4,924
of 28,054 · #2,261 all time
Rank in Japan
#109
of 1,070
Research works
21k
▼ 6% vs 2013–17
Citations
347k
16.7 per fractional work
Top-10% rate
10.0%
record average 16.5%
Open access
41%
world 28%

What is Ehime 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 #2,473 of 10,443 12.5%598 #2414
Health SciencesDomain #3,475 of 11,982 12.2%633 #3248
Life SciencesDomain #2,410 of 7,800 11.3%393 #1994
Physical SciencesDomain #4,938 of 12,888 6.9%739 #1908
Social SciencesDomain #6,682 of 10,521 13.1%110 #6708
SurgerySubfield #1,156 of 1,816 13.4%96 #1589
Environmental ScienceField #2,375 of 3,551 10.7%142 #854
Biochemistry, Genetics and Molecular BiologyField #2,478 of 3,579 11.1%187 #1859
EngineeringField #4,689 of 6,636 5.9%213 #2259
Agricultural and Biological SciencesField #2,726 of 3,409 10.5%122 #2861

Each strip is that field’s whole ranked pool, with the notch where Ehime 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#2,414 #2,473
  2. Health Sciences#3,248 #3,475
  3. Life Sciences#1,994 #2,410
  4. Physical Sciences#1,908 #4,938
  5. Social Sciences#6,708 #6,682
  6. Surgery#1,589 #1,156
  7. Environmental Science#854 #2,375
  8. Biochemistry, Genetics and Molecular Biology#1,859 #2,478
  9. Engineering#2,259 #4,689
  10. Agricultural and Biological Sciences#2,861 #2,726
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 Ehime University specialise in?

Where its research is concentrated relative to its size: Hepatology takes 5.8× the share of its output that it takes of world research.

  1. HepatologySubfield · 20.9 works5.8×
  2. GeophysicsSubfield · 28.8 works4.4×
← 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: 1.37× its world share, 122 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 1.87× its world share, 187 worksBiochemistry, Geneti…Immunology and Microbiology: 1.94× its world share, 37 worksImmunology and Micro…Neuroscience: 1.34× its world share, 41 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.91× its world share, 6 worksPharmacology, Toxico…Chemical Engineering: 1.11× its world share, 7 worksChemical EngineeringChemistry: 1.78× its world share, 52 worksChemistryComputer Science: 0.52× its world share, 76 worksComputer ScienceEarth and Planetary Sciences: 2.07× its world share, 61 worksEarth and Planetary …Energy: 0.44× its world share, 8 worksEnergyEngineering: 0.76× its world share, 213 worksEngineeringEnvironmental Science: 1.53× its world share, 142 worksEnvironmental ScienceMaterials Science: 1.64× its world share, 107 worksMaterials ScienceMathematics: 1.05× its world share, 23 worksMathematicsPhysics and Astronomy: 1.17× its world share, 49 worksPhysics and AstronomyDentistry: 0.44× its world share, 4 worksDentistryHealth Professions: 0.36× its world share, 18 worksHealth ProfessionsMedicine: 1.66× its world share, 598 worksMedicineNursing: 1.31× its world share, 12 worksNursingVeterinary: 0.52× its world share, 1 worksVeterinaryArts and Humanities: 0.19× its world share, 10 worksArts and HumanitiesBusiness, Management and Accounting: 0.16× its world share, 10 worksBusiness, Management…Decision Sciences: 0.15× its world share, 3 worksDecision SciencesEconomics, Econometrics and Finance: 0.21× its world share, 8 worksEconomics, Econometr…Psychology: 0.42× its world share, 24 worksPsychologySocial Sciences: 0.23× its world share, 55 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Earth and Planetary Sciences, 2.1×. Every wedge is a field page.

Who are the top researchers at Ehime University?

Ranked on the composite score, Katsuhiko Kohara, Masaki Yasukawa and Takafumi Okura lead among researchers whose main affiliation is Ehime University.

  1. 1 Katsuhiko Kohara · #34,870 worldwide 401 citations · 44 works
  2. 2 Masaki Yasukawa · #41,847 worldwide 272 citations · 43 works
  3. 3 Takafumi Okura · #54,511 worldwide 299 citations · 34 works
  4. 4 Yoshihiko Sadaoka · #58,483 worldwide 610 citations · 71 works
  5. 5 Yoichi Hiasa · #69,364 worldwide 494 citations · 140 works
  6. 6 Masatsugu Horiuchi · #84,995 worldwide 414 citations · 72 works
  7. 7 Hiromichi Aono · #90,778 worldwide 466 citations · 55 works
  8. 8 Masanobu Matsuguchi · #95,415 worldwide 256 citations · 28 works
  9. 9 Masashi Hirooka · #111,026 worldwide 200 citations · 84 works
  10. 10 Shigeki Higashiyama · #116,270 worldwide 287 citations · 54 works
All ranked researchers at Ehime University

Which keywords describe research at Ehime University?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Inflammation, Epidemiology, Oxidative Stress, Climate Change, Superconductivity, Metabolic Syndrome, Treatment and Chemotherapy.

▲ 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. Epidemiology103▲ 1.38×114 topics
  2. Inflammation81▲ 2.1×76 topics
  3. Climate Change61▲ 1.20×69 topics
  4. Oxidative Stress53▲ 1.74×58 topics
  5. Treatment44▲ 1.92×42 topics
  6. Cancer41▲ 1.63×48 topics
  7. Metabolic Syndrome38▲ 2.5×22 topics
  8. Cardiovascular Disease36▲ 1.74×35 topics
  9. Environmental Impact36◆ 1.13×39 topics
  10. Diagnosis35▲ 2.0×35 topics
  11. Chemotherapy35▲ 2.6×24 topics
  12. Immunotherapy30▲ 2.3×17 topics
  13. Obesity29▲ 2.1×21 topics
  14. Biomarkers26▲ 2.0×15 topics
  15. Insulin Resistance26▲ 3.0×9 topics
  16. Management26▲ 1.73×29 topics
  17. Clinical Practice Guidelines23▲ 2.3×11 topics
  18. Hepatocellular Carcinoma23▲ 5.8×3 topics
  19. Superconductivity23▲ 7.1×9 topics
  20. Aging22▲ 2.2×15 topics
  21. Tumor Microenvironment21▲ 2.5×8 topics
  22. Invasive Species21▲ 2.6×18 topics
  23. Plate Tectonics21▲ 7.3×3 topics
  24. Heart Failure20▲ 2.5×13 topics
  25. Prognostic Factors20▲ 2.4×13 topics
  26. Genetic Mutations20▲ 2.4×21 topics
  27. Cytokines19▲ 3.5×8 topics
  28. Echocardiography18▲ 3.5×8 topics
  29. Self-Assembly18▲ 2.9×10 topics
  30. Neoadjuvant Therapy18▲ 4.0×5 topics
  31. Cardiovascular Risk17▲ 2.9×8 topics
  32. Myocardial Infarction16▲ 3.7×6 topics
  33. Hepatic Steatosis16▲ 5.6×2 topics
  34. Tomography15▲ 4.4×5 topics
  35. Revision Surgery14▲ 6.0×2 topics
  36. Total Hip Replacement14▲ 6.0×2 topics
  37. Cardiac Imaging14▲ 6.2×3 topics
  38. NAFLD12▲ 5.4×1 topic
  39. Crystal Structure Prediction10▲ 12×1 topic
  40. Mantle Dynamics10▲ 12×1 topic

Which research topics does Ehime University publish most on?

By volume in 2022–2025: Liver Disease Diagnosis and Treatment, High-pressure geophysics and materials, Geological and Geochemical Analysis and Pancreatic and Hepatic Oncology Research.

Liver Disease Diagnosis …12Liver Disease Diagnosis and Treatment: 12 fractional worksHigh-pressure geophysics…10High-pressure geophysics and materials: 10 fractional worksGeological and Geochemical Analysis: 10 fractional worksPancreatic and Hepatic Oncology Research: 10 fractional worksHepatocellular Carcinoma Treatment and Prognosis: 8 fractional worksCardiac Imaging and Diagnostics: 8 fractional worksRNA and protein synthesis mechanisms: 8 fractional worksPorphyrin and Phthalocya…8Porphyrin and Phthalocyanine Chemistry: 8 fractional worksNutrition and Health in Aging: 8 fractional worksOrthopaedic implants and arthroplasty: 7 fractional works
EpidemiologyGeophysicsOncologyHepatology5 others

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

  1. 1 Liver Disease Diagnosis and TreatmentEpidemiology 12 works
  2. 2 High-pressure geophysics and materialsGeophysics 10 works
  3. 3 Geological and Geochemical AnalysisGeophysics 10 works
  4. 4 Pancreatic and Hepatic Oncology ResearchOncology 10 works
  5. 5 Hepatocellular Carcinoma Treatment and PrognosisHepatology 8 works
  6. 6 Cardiac Imaging and DiagnosticsRadiology, Nuclear Medicine and Imaging 8 works
  7. 7 RNA and protein synthesis mechanismsMolecular Biology 8 works
  8. 8 Porphyrin and Phthalocyanine ChemistryMaterials Chemistry 8 works
  9. 9 Nutrition and Health in AgingPhysiology 8 works
  10. 10 Orthopaedic implants and arthroplastySurgery 7 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 available41.1%not open58.9%

World: 28% of research is openly available.

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

World: 19% is written across borders.

How has Ehime University's research output changed?

Output in 2018–2022 was 6% 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 Matsuyama

All research institutions in Matsuyama

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.