转型协议中包含的混合期刊的开放程度如何？
How open are hybrid journals included in transformative agreements?
AI总结：
本研究整合多源开放数据分析700余份转型协议，发现混合期刊开放获取占比虽从2018年4.3%增至2022年15%，但当前协议实施水平仍不足以推动向完全开放获取的大规模转型。
摘要：
围绕旨在将订阅制期刊出版转向完全开放获取的转型协议（transformative agreements）的持续争议，凸显了开展大规模研究以评估这些协议对混合开放获取影响的必要性。本研究整合了cOAlition S Journal Checker、Crossref和OpenAlex等多个开放数据源，提出了一种新颖的分析方法，对700余份协议展开了分析。结果显示，开放获取占比呈现强劲增长态势，从2018年的4.3%提升至2022年的15%。五年间，11189种混合期刊为8146958篇论文中的742369篇（占比9.1%）提供了开放获取权限。在此期间，能够利用转型协议的作者贡献了328957篇开放获取论文（占比44%），并在2022年达到峰值——当年249511篇开放获取论文中有143615篇（占比58%）来自这类作者。尽管这一趋势主要由Elsevier、Springer Nature和Wiley这三家商业出版商推动，但开放获取的采纳情况在不同期刊、出版商、学科和国家之间存在显著差异，尤其是经合组织（OECD）地区与金砖国家（BRICS）地区呈现出不同的出版趋势。结论表明，当前转型协议的实施水平不足以推动出版业向完全开放获取的大规模转型。
英文摘要：
The ongoing controversy surrounding transformative agreements, which aim to transition subscription-based journal publishing to full open access, highlights the need for large-scale studies assessing the impact of these agreements on hybrid open access. By combining multiple open data sources, including cOAlition S Journal Checker, Crossref, and OpenAlex, this study presents a novel approach that analyses over 700 agreements. Results suggest a strong growth in open access, from 4.3% in 2018 to 15% in 2022. Over five years, 11,189 hybrid journals provided open access to 742,369 out of 8,146,958 articles (9.1%). Authors who could make use of transformative agreements contributed 328,957 open access articles (44%) during this period, reaching a peak in 2022 with 143,615 out of 249,511 open access articles (58%). While this trend was predominantly driven by the three commercial publishers Elsevier, Springer Nature, and Wiley, open access uptake varied substantially across journals, publishers, disciplines, and countries. Particularly, the OECD and BRICS areas revealed different publication trends. In conclusion, this study suggests that current levels of implementation of transformative agreements is insufficient to bring about a large-scale transition to full open access.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
