Hiroshi Koyama

9.9k total citations
288 papers, 5.9k citations indexed

About

Hiroshi Koyama is a scholar working on Pulmonary and Respiratory Medicine, Nutrition and Dietetics and Oncology. According to data from OpenAlex, Hiroshi Koyama has authored 288 papers receiving a total of 5.9k indexed citations (citations by other indexed papers that have themselves been cited), including 59 papers in Pulmonary and Respiratory Medicine, 40 papers in Nutrition and Dietetics and 33 papers in Oncology. Recurrent topics in Hiroshi Koyama's work include Trace Elements in Health (32 papers), Chronic Obstructive Pulmonary Disease (COPD) Research (32 papers) and Selenium in Biological Systems (25 papers). Hiroshi Koyama is often cited by papers focused on Trace Elements in Health (32 papers), Chronic Obstructive Pulmonary Disease (COPD) Research (32 papers) and Selenium in Biological Systems (25 papers). Hiroshi Koyama collaborates with scholars based in Japan, Indonesia and United States. Hiroshi Koyama's co-authors include Koichi Nishimura, Akihiko Ikeda, Mitsuhiro Tsukino, Takateru Izumi, Rizky Abdulah, Takashi Hajiro, Chiho Yamazaki, Satomi Kameo, Minato Nakazawa and Shosuke Suzuki and has published in prestigious journals such as New England Journal of Medicine, SHILAP Revista de lepidopterología and PLoS ONE.

In The Last Decade

Hiroshi Koyama

263 papers receiving 5.7k citations

Peers

Countries citing papers authored by Hiroshi Koyama

Since Specialization

Citations

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

Fields of papers citing papers by Hiroshi Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroshi Koyama

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work	Indexed citations
1	Analysis of adverse events related to extracorporeal membrane oxygenation from a nationwide database of patient-safety accidents in Japan 2023 ·Journal of Artificial Organs ·(unknown), Tadashi Kamio, (unknown), (unknown), (unknown), Hiroshi Koyama	7
2	Spontaneous pneumothorax with coronavirus disease 2019 in non-ventilated patients: A single-center retrospective case series 2021 ·Annals of Medicine and Surgery ·(unknown), Hiroshi Koyama, (unknown), Tadashi Kamio, Hiroshi Yamagami, (unknown)	2
3	Circulatory Hyperactivity and Risk of Heart Attack in Elderly Persons During High Land Physical Activity: Concomitant Risk for Rescuers Who May Work on Cardiopulmonary Resuscitation 2020 ·International Journal of Physical Medicine & Rehabilitation ·(unknown), Shigeru Saito, Yusuke Matsui, (unknown), Masaru Tobe, Hiroshi Koyama	1
4	Prevalence and clinical characteristics of earlobe crease in systemic sclerosis: Possible association with vascular dysfunction 2020 ·The Journal of Dermatology ·Akiko Sekiguchi, Yuta Inoue, Sahori Yamazaki, Akihiko Uchiyama, Osamu Ishikawa, Shiko Kuribayashi, Toshio Uraoka, Kenichiro Hara, Kouichi Yamaguchi, Toshitaka Maeno, Mitsuo Uchida, Hiroshi Koyama, Sei‐ichiro Motegi	1
5	A STUDY OF THE ASSOCIATION BETWEEN SELENIUM AND CARDIOVASCULAR DISEASE IN LAMPUNG, INDONESIA. 2016 ·PubMed ·(unknown), Ida Farida Rivai, (unknown), Rizky Abdulah, Kenji Kobayashi, Chiho Yamazaki, Satomi Kameo, Minato Nakazawa, Hiroshi Koyama	6
6	Characteristics and Effects of Accelerator Containing C-S-H Nanoparticles 2015 ·Concrete Journal ·Hiroshi Koyama, Hiroaki Imoto, Shunzo Koizumi, (unknown)	2
7	[A retrospective study of high-dose toremifene treatment for patients with aromatase inhibitor refractory advanced or metastatic hormone receptor-positive breast cancer]. 2011 ·PubMed ·Hiroshi Koyama, (unknown), (unknown), Toshihiro Okada, Takayuki Watanabe, (unknown), Tokiko Ito, Kazuma Maeno, Yasuhiro Mochizuki, Ken‐ichi Ito, (unknown)	2
8	Hyaluronan Deficiency in Tumor Stroma Impairs Macrophage Trafficking and Tumor Neovascularization 2010 ·Cancer Research ·Nobutaka Kobayashi, (unknown), (unknown), Hiroshi Koyama, Masato Kitazawa, Michiko Takeoka, Kenji Sano, Jun Amano, Zenzo Isogai, Shumpei Niida, Kayoko Oguri, Minoru Okayama, John A. McDonald, Koji Kimata, Shun’ichiro Taniguchi, Naoki Itano	155
9	Factor Analysis of the Kokoro Check Sheet (KCS) - Newly Developed Questionnaire for Depression Screening -:- Newly Developed Questionnaire for Depression Screening - 2009 ·The Kitakanto Medical Journal ·(unknown), (unknown), (unknown), (unknown), (unknown), Minato Nakazawa, Hiroshi Koyama	1
10	Effects of Medical Treatments on an Improvement of Asthma in the Early Stages of Life 2007 ·Pediatric Asthma Allergy & Immunology ·(unknown), Hiroyuki Mochizuki, Tohru Kobayashi, Hirokazu Arakawa, Kenichi Tokuyama, Hiroshi Koyama, Akihiro Morikawa	0
11	Significance of Tumor-Associated Stroma in Promotion of Intratumoral Lymphangiogenesis 2007 ·American Journal Of Pathology ·Hiroshi Koyama, Nobutaka Kobayashi, (unknown), Michiko Takeoka, Yoshiko Kawai, Kenji Sano, Maiko Fujimori, Jun Amano, Toshio Ohhashi, Reiji Kannagi, Koji Kimata, Shun’ichiro Taniguchi, Naoki Itano	100
12	Direct Analysis of Ceruloplasmin in Human Blood Serum by HPLC/Inductively Coupled Plasma-Mass Spectrometry for the Diagnosis of Wilson Disease 2007 ·Kenji Kobayashi, (unknown), Rizky Abdulah, Chie Fujisawa, Takeaki Nagamine, Akihiro Morikawa, Masami Murakami, Hiroko Kodama, Hiroshi Koyama	3
13	A generation-based framework for spacecraft operation 2005 ·(unknown), (unknown), Hiroshi Koyama, Noriyasu Inaba	1
14	A Novel, Short, and Simple Questionnaire to Measure Health-related Quality of Life in Patients with Chronic Obstructive Pulmonary Disease 1999 ·American Journal of Respiratory and Critical Care Medicine ·Takashi Hajiro, Koichi Nishimura, (unknown), Mitsuhiro Tsukino, Akihiko Ikeda, Hiroshi Koyama, Takateru Izumi	94
15	Comparison of Discriminative Properties among Disease-specific Questionnaires for Measuring Health-related Quality of Life in Patients with Chronic Obstructive Pulmonary Disease 1998 ·American Journal of Respiratory and Critical Care Medicine ·Takashi Hajiro, Koichi Nishimura, Mitsuhiro Tsukino, Akihiko Ikeda, Hiroshi Koyama, Takateru Izumi	232
16	Analysis of Clinical Methods Used to Evaluate Dyspnea in Patients with Chronic Obstructive Pulmonary Disease 1998 ·American Journal of Respiratory and Critical Care Medicine ·Takashi Hajiro, Koichi Nishimura, Mitsuhiro Tsukino, Akihiko Ikeda, Hiroshi Koyama, Takateru Izumi	193
17	A STUDY OF DYE ORAL ADMINISTRATION METHOD FOR COLONOSCOPY (REPORT 1) 1991 ·Acta gastro-enterologica belgica ·(unknown), Hiroshi Koyama, (unknown), (unknown), (unknown), (unknown), Tetsuji Tokunaga, (unknown), (unknown), (unknown), Masahiko Kobayashi, (unknown), (unknown), Shigeaki Nagao, Hisao Tajiri, (unknown), Hirohumi Niwa	2
18	CAPABILITY OF EACH SPECTRUM OF VISIBLE RAYS REPRESENTING UPPER GASTROINTESTINAL DISEASE 1989 ·Acta gastro-enterologica belgica ·(unknown), Shigeaki Nagao, (unknown), (unknown), Keizo WATANABE, Atsushi Kawaguchi, Masahiko Kobayashi, (unknown), (unknown), Hiroshi Koyama, Kunihiko Hino, Hirohumi Niwa	0
19	Effects of non-shunting operation on azygos venous blood flow in cirrhotic patients. 1989 ·Gut ·Norihiro Kokudo, Seiji Kawasaki, (unknown), Hiroaki Sakamoto, Hiroshi Koyama, Kensho Sanjo, Yasuo Idezuki	2
20	Autonomous GPS-INS-Star satellite navigation system concept 1984 ·Toru Tanabe, (unknown), Hiroshi Koyama, Shinichi Nakasuka	1

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.

Explore authors with similar magnitude of impact