arXiv subjects

Myroslava Hladchenko

Publications and source records attributed to Myroslava Hladchenko.

11 recordsLinked to original sources

arXiv2026

Foreign co-affiliations and performance measurement of universities and the National Academy of Sciences of Ukraine, 2020-2023

This study examines the role of foreign co-affiliations in shaping the research performance of Ukrainian universities and research institutes of the National Academy of Sciences of Ukraine (NASU) before and during Russias full-scale invasion. In 2023, the share of articles with foreign co-affiliations was higher for NASU (17.1 percent) than for universities (10.6 percent), reflecting NASUs research-oriented profile and strong focus on physical sciences & engineering. In 2022 and 2023, this share increased across all disciplines in both types of institutions. The largest shares of articles with foreign co-affiliations involved institutions in advanced science systems such as Germany and China, as well as neighboring Poland, Czechia, and Slovakia. Articles with foreign co-affiliations showed citation impact comparable to internationally co-authored articles and substantially outperformed purely domestic publications.On the one hand, articles with foreign co-affiliations ensure research continuity and enhance the citation visibility of a resource-constrained and war-affected national science system. On the other hand, they distort the measurement of the national and institutional research performance, thereby hindering reform of the national science system. Reliance solely on international links cannot substitute for a strong domestic base. Evaluation frameworks in Ukraine and other countries could be improved through a two-level differentiation, distinguishing first between types of authorship and second among types of foreign co-affiliations, taking into account their duration and the extent of the affiliated scholars' actual contributions. Although this lies beyond the primary scope of the present study, the findings highlight that the institutional divide between NASU and universities in Ukraine is not justified by research performance.

cs.DL↗

arXiv2026

Evolution of bilateral and multilateral collaboration of EU-14 countries across disciplines, 2010-2024

This study explores the evolution of bilateral and multilateral research collaboration of nine EU-14 member states, both within Europe and globally, across six disciplines, between 2010 and 2024, using OpenAlex data. Results indicate that bilateral collaboration rates remained relatively stable and predominantly concentrated within EU-14 countries, followed by the USA, the UK, and China. Multilateral collaboration rates increased significantly across all disciplines, with the highest increase observed in medicine and the highest overall rates maintained in physics & astronomy. The same trend across disciplines was observed for the Relative Intensity of Collaboration (RIC). This reflects the growing importance of large-scale international research consortia in infrastructure-intensive fields that address global scientific challenges. RIC has increased for both bilateral and multilateral collaboration, with stronger growth in multilateral collaboration. Multilateral RIC fell below the expected level most frequently with South Korea, India, and China. Across both collaboration types, increases in collaboration rates were generally associated with increases in RIC. No substantial changes in collaboration rates or RIC with the UK were observed following Brexit. A decline in multilateral collaboration with Russia in physics and astronomy coincided with its suspension from Horizon Europe in 2022, while the collaboration rate in medicine increased.

cs.DL↗

arXiv2026

Bilateral and multilateral international scientific collaboration of EU member states: OpenAlex vs Scopus (2000-2024)

This study examines the evolution of bilateral and multilateral scientific collaboration among EU Member States and between the EU and global partners from 2000 to 2024 using data from OpenAlex and Scopus. The results show that OpenAlex, when restricted to cited articles, yields findings broadly comparable to those obtained from Scopus for assessing country-level research collaboration. Relative Intensity of Collaboration (RIC) values are consistently higher for multilateral than for bilateral partnerships. Increased collaboration intensity during the final years of FP7, the intermediate and later stages of Horizon 2020, and the final years of the study period suggests that EU FP may have strengthened collaboration among participating countries. With regard to European integration, multilateral collaboration intensity increased between the EU-14 and EU-13, between these groups and EU candidate countries, and within the EU-13. Despite this growth, structural asymmetries persist. Bilateral collaboration among EU-14 countries is concentrated within the group and with EU-13, Brazil, Norway, Switzerland, and the United Kingdom, whereas EU-13 countries collaborate more intensively within the group, with EU candidate countries and Russia. EU-14 countries maintain stronger multilateral collaboration with high-income countries such as Australia, Canada, and the United States than do EU-13 countries. For both groups, collaboration with China remains the weakest. Although multilateral collaboration intensity with Russia has declined, it remained above the expected level for the EU-14 in 2024 and was 2.5 times higher than expected for the EU-13. This persistence may reflect the continued participation of Russian researchers in multilateral projects despite Russia's suspension from Horizon Europe in 2022.

cs.DL↗

arXiv2026

Emerging and established topics in drone research: Citation impact and knowledge flows across China, the United States, the EU, Ukraine, and Russia (2020-2025)

This study examined emerging and established topics in drone research, focusing on citation impact and knowledge flows across China, the United States, the EU, Ukraine, and Russia between 2020 and 2025 using OpenAlex bibliographic data. The findings revealed that drone-related science is characterised by growing geopolitical asymmetries in scientific production, citation concentration, and international knowledge exchange. In particular, China increasingly dominated scientific production, fractional authorship contribution, and domestic citation circulation. In contrast, the United States and EU countries maintained comparatively more internationally distributed citation structures. However, China-affiliated publications became increasingly integrated into global citation networks, particularly through growing citation exchange with the United States and European countries. Notably, the interpretation of authorship and citation patterns was complicated by the high proportion of publications with unidentified affiliations, which reached 50% in 2025 within weak-signal topics. These findings underscore the importance of developing comprehensive national Research Organisation Registries (RORs). Although China demonstrated a citation advantage, this was partly driven by high internal domestic citation concentration rather than exclusively by global integration. Moreover, China still imported proportionally more knowledge from the EU-14 and the United States than it exported, with this asymmetry increasing over time. EU-14 countries maintained the strongest citation impact in weak-signal topics, suggesting a more prominent role in shaping emerging research directions. At the same time, China-affiliated publications cited the United States more frequently than the EU-14 in both strong- and weak-signal topics, with this pattern being particularly pronounced in weak-signal areas.

cs.DL↗

arXiv2026

APCs and citation impact of Gold OA articles authored by Ukrainian scholars before and during Russia's full-scale war against Ukraine (2020-2023)

This study first examines how APC expenditures, authorship patterns, and publishing venues of Ukrainian scholars changed between the pre-war (2020-2021) and wartime (2022-2023) periods. Second, it explores the extent to which APC levels are associated with the field-normalized citation impact (FNCI) of Gold Open Access articles authored by Ukrainian scholars. Statistical analysis revealed a small but significant correlation between APC amounts and citation impact, though the effect size was minimal, suggesting higher APCs did not substantially boost citations. APC waivers offered by major publishers such as Springer and Elsevier since 2022 resulted in only a slight increase in the number of articles authored solely by Ukrainian scholars. Despite these waivers, MDPI and Aluna maintained the largest shares. Between 2020 and 2023, the number of articles authored solely by Ukrainian scholars in foreign journals fell by 25.7 percent, and total APC spending declined by 24.6 percent, from 1.24 million EUR to 0.93 million EUR. Medicine accounted for the largest share of both articles and APC expenditure, with the majority published in Aluna journals.

cs.DL↗

arXiv2026

Implications of Russia's full-scale invasion of Ukraine for the international mobility of Ukrainian scholars

This study examines the implications of Russia's full-scale invasion of Ukraine for the international mobility of Ukrainian scholars. The dataset, drawn from the CWTS in-house Scopus database, includes Ukrainian scholars who were internationally mobile between 2020 and 2023. The analysis focuses on scholars affiliated with universities and the National Academy of Sciences of Ukraine (NASU) prior to moving abroad. The findings reveal an increase in the number of internationally mobile scholars in 2022-2023, driven primarily by rising mobility from universities. For NASU-affiliated scholars, Russia was the top destination country in 2020-2021 but fell to fourth place in 2022-2023, overtaken by Germany, China, and Poland. For university-affiliated scholars, Poland, Germany, and Russia consistently ranked as the top three destination countries across both periods. Statistical tests indicate no significant difference in mean Field-Weighted Citation Impact (FNCI) between scholars who were internationally mobile in 2020-2021 and those mobile in 2022-2023. However, the share of internationally mobile scholars with articles among the top 10% most cited globally increased among those previously affiliated with universities, while it declined among those affiliated with NASU. In both periods, the proportion of scholars with articles in the top 10% most cited globally, published during the five years prior to changing their country of affiliation, was higher among internationally mobile scholars than among those who remained affiliated with Ukrainian institutions. Whether this mobility constitutes a brain drain requires further research. If effectively leveraged, international mobility may strengthen Ukraine's integration into global scientific networks, support post-war recovery, and contribute to a more resilient, internationally connected, and competitive academic system.

cs.DL↗

arXiv2026

Evolving scientific collaboration among EU member states, candidate countries and global partners: 2000-2024

This study explores how EU integration, globalisation, and geopolitical disruptions have influenced scientific collaboration among European countries at different stages of EU membership. Specifically, it distinguishes between the EU-14, the EU-13, that joined the EU in 2004 or later, and EU candidate countries. Using Scopus article, the study analyses Relative Intensity of Collaboration (RIC) among EU member state, candidate countries and China, Latin America, the UK, the USA and Russia. Findings indicate increasing integration within European groups and with global partners, yet persistent hierarchical structures remain. EU-14 countries form the core of the network, exhibiting stable and cohesive collaboration, including with the UK despite Brexit. EU-13 countries occupy an intermediate position, showing moderate collaboration with EU-14 but stronger collaboration within their own group, with EU candidate countries and Russia. EU candidate countries demonstrate even weaker integration with EU-14, focusing on intra-group ties and links with EU-13 and Russia. RIC peaks in 2012 and 2018 for EU-13 and EU candidate countries correspond to Horizon 2020 and Horizon Europe cycles, highlighting the role of EU Framework Programmes. Collaboration with Russia increased following 2014 and only marginally declined after 2022. For EU-14, it exceeds collaboration with the USA. Collaboration with China remains limited due to network and cultural constraints, with similar intensity across all three groups. Overall, funding and policy initiatives are critical for stable international collaboration.

cs.DL↗

arXiv2025

Funding, authorship patterns and citation impact of articles funded by Ukrainian agencies before and during Russia's full-scale war (2020-2023)

This study explores funding, authorship patterns, and citation impact of articles funded by the Ministry of Education and Science of Ukraine (MESU), the National Academy of Sciences of Ukraine (NASU), and the National Research Foundation of Ukraine (NRFU). The analysis focuses on articles published in Scopus-indexed journals between 2020 and 2023. The findings show that the share of articles funded by these agencies increased from 8.6% in 2020-2021 to 11.9% in 2022-2023. Foreign co-funding as well as international co-authorship and co-affiliations are consistently associated with higher citation impact. In particular, foreign co-affiliations are associated with higher field-normalised citation impact (FNCI) for MESU-funded articles in 2022-2023, exceeding that of articles jointly funded by MESU and foreign agencies. NASU funding is associated with only modest differences in citation impact relative to unfunded articles. These effects are small and not consistently significant across authorship patterns and become less pronounced in 2022-2023, as the citation impact of unfunded articles partially converges with that of funded articles. While the results should be interpreted as average group-level tendencies rather than deterministic effects, they raise important questions about the effectiveness of current funding allocation mechanisms and evaluation criteria, highlighting the need for evidence-based reform of Ukraine's research funding system.

cs.DL↗

arXiv2025

Access models, authorship patterns, and citation impact in Ukrainian scholarly publishing (2020-2023)

This study aimed to explore the relationship between access models, authorship patterns, and citation impact in Ukrainian research output from 2020 to 2023. The focus was on scholars affiliated with the National Academy of Sciences of Ukraine (NASU) and universities. Findings highlight that open access (OA) articles constituted the majority of publications by Ukrainian scholars during this period. This percentage reached 75.4% for NASU and 85.8% for universities. In both cases, the increase was driven by Gold OA and Hybrid Gold OA, the latter benefiting in part from Elsevier's waivers. Diamond OA prevailed for NASU, while Gold OA was dominant for universities. The effects of Russia's full-scale invasion of Ukraine included (1) a decline in the share of articles in foreign journals for both NASU and universities, (2) a decrease in Gold OA in foreign journals and an increase in Gold OA in Ukrainian journals for universities, and (3) a rise in internationally co-authored Gold OA articles in foreign journals for both entities. Despite waivers for Gold OA provided by major publishers and an increase in Gold OA articles in Elsevier and Springer journals, MDPI and Aluna Publishing House remained the dominant publishers of Gold OA in foreign journals. Hybrid Gold OA, Bronze OA, and Green OA articles in foreign journals had the highest citation impact. The citation impact of Gold OA outperformed Diamond OA. The study confirms the growing dominance of Gold OA, suggesting the need for sustainable OA models that ensure both equity and broad dissemination of research.

cs.DL↗

arXiv2025

International collaboration of Ukrainian scholars: Effects of Russia's full-scale invasion of Ukraine

This study explores the effects of Russia's full-scale invasion of Ukraine on the international collaboration of Ukrainian scholars. First and foremost, Ukrainian scholars deserve respect for continuing to publish despite life-threatening conditions, mental strain, shelling and blackouts. In 2022-2023, universities gained more from international collaboration than the NASU. The percentage of internationally co-authored articles remained unchanged for the NASU, while it increased for universities. In 2023, 40.8% of articles published by the NASU and 32,2% of articles published by universities were internationally co-authored. However, these figures are still much lower than in developed countries (60-70%). The citation impact of internationally co-authored articles remained statistically unchanged for the NASU but increased for universities. The highest share of internationally co-authored articles published by the NASU in both periods was in the physical sciences and engineering. However, the citation impact of these articles declined in 2022-2023, nearly erasing their previous citation advantage over university publications. Universities consistently outperformed the NASU in the citation impact of internationally co-authored articles in biomedical and health sciences across both periods. International collaboration can help Ukrainian scholars to go through this difficult time. In turn, they can contribute to the strengthening of Europe.

cs.DL↗

arXiv2021

Bibliometric assessment of national scientific journals

Nationally oriented scientific-scholarly journals are considered from a methodological-informetric viewpoint, analysing data extracted from Scimago Journal Rank based on Scopus. An operational definition is proposed of a journal's degree of national orientation based on the geographical distribution of its publishing or citing authors, and the role of international collaboration and a country's total publication output. A comprehensive analysis is presented of trends up until 2019 in national orientation and citation impact of national journals entering Scopus, extending outcomes in earlier studies. A method to analyse national journals of given countries is applied to the set of former USSR republics and Eastern and Central European states which were under socialism, distinguishing between domestic and foreign national journals. The possible influence is highlighted of factors related to a journal's access status, publication language and subject field, international scientific migration and collaboration, database coverage policies, the size of a national research community, historical-political factors and national research assessment and funding policies.

cs.DL↗