Kohei Oka

514 total citations
52 papers, 328 citations indexed

About

Kohei Oka is a scholar working on Pulmonary and Respiratory Medicine, Surgery and Materials Chemistry. According to data from OpenAlex, Kohei Oka has authored 52 papers receiving a total of 328 indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Pulmonary and Respiratory Medicine, 13 papers in Surgery and 11 papers in Materials Chemistry. Recurrent topics in Kohei Oka's work include Catalytic Processes in Materials Science (10 papers), Gastric Cancer Management and Outcomes (7 papers) and Pancreatic and Hepatic Oncology Research (6 papers). Kohei Oka is often cited by papers focused on Catalytic Processes in Materials Science (10 papers), Gastric Cancer Management and Outcomes (7 papers) and Pancreatic and Hepatic Oncology Research (6 papers). Kohei Oka collaborates with scholars based in Japan, United States and United Kingdom. Kohei Oka's co-authors include Toshifumi Tsuji, Takashi Okuda, Toshiyuki Komaki, Keizo Kagawa, N. Iwai, Hideaki Kasai, Tasuku Hara, Yoshito Itoh, Michio Okada and Akitaka Yoshigoe and has published in prestigious journals such as Angewandte Chemie International Edition, SHILAP Revista de lepidopterología and Environmental Science & Technology.

In The Last Decade

Kohei Oka

40 papers receiving 320 citations

Peers

Kohei Oka
B. Krüger Germany
Yoonseok Han South Korea
Hannah E. Johnston United Kingdom
Chengcheng Liu China
Hideki Kanai Japan
Yoshitaro Saito Japan
S. Lam United States
Seiya Tanaka Japan
Runchen Wang China
Dennis Poon Singapore
B. Krüger Germany
Kohei Oka
Citations per year, relative to Kohei Oka Kohei Oka (= 1×) peers B. Krüger

Countries citing papers authored by Kohei Oka

Since Specialization
Citations

This map shows the geographic impact of Kohei Oka'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 Kohei Oka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kohei Oka more than expected).

Fields of papers citing papers by Kohei Oka

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kohei Oka. 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 Kohei Oka. The network helps show where Kohei Oka may publish in the future.

Co-authorship network of co-authors of Kohei Oka

This figure shows the co-authorship network connecting the top 25 collaborators of Kohei Oka. A scholar is included among the top collaborators of Kohei Oka 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 Kohei Oka. Kohei Oka is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Zhang, Ningqiang, Chenxi He, Yuan Jing, et al.. (2025). Steam‐Activated Lattice Oxygen Enhances Interfacial Redox Stability for Low‐Temperature N 2 O Decomposition over Rh/CeO 2. Angewandte Chemie International Edition. 64(49). e202517403–e202517403.
2.
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Sakai, Hiroaki, N. Iwai, Osamu Dohi, et al.. (2024). Effect of texture and color enhancement imaging on the visibility of gastric tumors. Scientific Reports. 14(1). 19125–19125. 2 indexed citations
4.
Iwai, N., Takashi Okuda, Kohei Oka, et al.. (2024). Prognostic value of moderate or massive ascites in patients with advanced gastric cancer. Oncology Letters. 27(3). 116–116. 1 indexed citations
5.
Machida, Masato, Tetsuya Sato, Hiroshi Yoshida, et al.. (2024). Catalytic NH3 oxidation affected by the nanometric roughness of the platinum overlayer. Nanoscale. 16(20). 9781–9790. 1 indexed citations
6.
Oka, Kohei, et al.. (2024). Intrathecal Trastuzumab for HER2-Positive Cancer of Unknown Primary Leptomeningeal Metastasis: A Case Report. Cureus. 16(3). e57322–e57322. 1 indexed citations
7.
Iwai, N., Kohei Oka, Hiroaki Sakai, et al.. (2024). Clinical significance of cachexia index determined by bioelectrical impedance analysis in patients with gastrointestinal cancer. Oncology Letters. 29(3). 114–114. 1 indexed citations
8.
Iwai, N., Hiroaki Sakai, Kohei Oka, et al.. (2023). Predictors of response to anamorelin in gastrointestinal cancer patients with cachexia: a retrospective study. Supportive Care in Cancer. 31(2). 115–115. 13 indexed citations
9.
Oka, Kohei, et al.. (2022). Measuring Factor XIII Inhibitors in Patients with Factor XIII Deficiency: A Case Report and Systematic Review of Current Practices in Japan. Journal of Clinical Medicine. 11(6). 1699–1699. 4 indexed citations
10.
Sakai, Hiroaki, N. Iwai, Junichi Sakagami, et al.. (2022). Rectal administration of low-dose diclofenac does not reduce post-endoscopic retrograde cholangiopancreatography pancreatitis: a propensity score matching analysis. Surgical Endoscopy. 37(4). 2698–2705. 5 indexed citations
11.
Oka, Kohei, et al.. (2022). Hemodialysis-Related Pericarditis With Cardiac Tamponade. Cureus. 14(5). e24748–e24748. 1 indexed citations
12.
Hara, Tasuku, Hiroaki Sakai, Kohei Oka, et al.. (2021). Microbiological analysis of patients with first and recurrent episodes of acute cholangitis in a middle-sized hospital: A single-center retrospective study in rural North Kyoto, Japan. Journal of Infection and Chemotherapy. 28(3). 413–419. 6 indexed citations
13.
Iwai, N., Takashi Okuda, Taishi Harada, et al.. (2020). Gastric Metastasis from Colorectal Cancer Mimicking a Submucosal Tumor. Case Reports in Gastroenterology. 14(2). 338–345. 4 indexed citations
14.
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Inoue, Ken, Takashi Okuda, Kohei Oka, et al.. (2019). Effects of L-Menthol and Carbon Dioxide on the Adenoma Detection Rate during Colonoscopy: L-Menthol and Carbon Dioxide on Colonoscopy. Digestion. 101(3). 323–331. 6 indexed citations
16.
Okada, Michio, Kohei Oka, Kazuki Kojima, et al.. (2016). Experimental and Theoretical Studies on Oxidation of Cu-Au Alloy Surfaces: Effect of Bulk Au Concentration. Scientific Reports. 6(1). 31101–31101. 38 indexed citations
17.
Oka, Kohei, Michio Okada, Michihiro Hashinokuchi, et al.. (2014). The effects of alloying and segregation for the reactivity and diffusion of oxygen on Cu3Au(111). Physical Chemistry Chemical Physics. 16(36). 19702–19702. 13 indexed citations
18.
Oka, Kohei, Michio Okada, Wilson Agerico Diño, et al.. (2013). Initial stages of Cu3Au(111) oxidation: oxygen induced Cu segregation and the protective Au layer profile. Physical Chemistry Chemical Physics. 16(8). 3815–3815. 16 indexed citations
19.
Tatebe, Shunsuke, et al.. (2006). Unusual Remnant Thymic Tissue in an Adult Mimicking Malignant Neoplasm: Escape From Age-Related Involution. The Thoracic and Cardiovascular Surgeon. 54(2). 138–140. 1 indexed citations
20.
Oka, Kohei, et al.. (2005). . Journal of the Japanese Society of Revegetation Technology. 31(1). 147–150.

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.

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