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Metrics

Metrics is an international, peer-reviewed, open access journal on informetrics published quarterly online by MDPI.
  • Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
  • Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 34.5 days after submission; acceptance to publication is undertaken in 6.7 days (median values for papers published in this journal in the first half of 2026).
  • Recognition of Reviewers: Reviewers whose reports are timely and of high quality receive an APC discount voucher for a future publication in an MDPI journal. Become a reviewer.

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All Articles (57)

  • Review
  • Open Access

High-Level Synthesis (HLS) has become an important methodology for implementing Machine Learning (ML) workloads on reconfigurable hardware; yet the development, technological characteristics, and research structure of HLS-for-ML have not been examined comprehensively across the literature. This study combines a PRISMA-based systematic literature review with bibliometric, scientometric, and systematic technological analyses to characterize the field and its development. Searches across Scopus, IEEE Xplore, Web of Science, and the ACM Digital Library retrieved 2911 records. Following deduplication, screening, full-text assessment, and a subsequent record-level eligibility and technological re-audit, 305 publications were retained in the corrected analytical corpus. Bibliometric and scientometric analyses examine publication growth, collaboration, citation structure, bibliographic coupling, keyword relationships, and thematic development, while a full-text-informed technological analysis characterizes ML workloads, Design Environments, hardware platforms, optimization strategies, evaluation approaches, and application contexts. The results show substantial growth in research activity, with 89.8% of the included publications appearing from 2019 onward, together with a distributed international research community and an identifiable intellectual structure connecting HLS, FPGA acceleration, and ML research. Technologically, the literature remains strongly FPGA-centered and CNN-oriented, while also encompassing emerging ML architectures, specialized ML-to-hardware frameworks, diverse optimization mechanisms, and multiple deployment and evaluation contexts. Cross-dimensional analysis shows that established techniques such as parallelism, pipelining, memory optimization, quantization, and dataflow coexist with workload-specific implementation strategies, including those used for Transformer and Graph Neural Network architectures. An evidence-derived multidimensional taxonomy organizes the field across six interacting dimensions. The review further identifies heterogeneous evaluation practices and limited benchmark commonality as challenges for cross-study comparison, while reproducibility, interoperability, and portability remain areas requiring dedicated investigation. Overall, HLS-for-ML is characterized by substantial research growth, persistent FPGA and HLS foundations, and a broad technological design space in which ML and hardware decisions interact across multiple abstraction levels.

Metrics

22 October 2026

Methodological framework.
  • Article
  • Open Access

Generative artificial intelligence (AI) in peer review raises questions of permission, human judgment, and fair participation. This normative and conceptual analysis proposes an author-authorised, journal-authorised, version-synchronised public-preprint pathway for bounded external-AI assistance. It aims to broaden opportunities for defensible criticism while maintaining rigorous evaluation and limiting governance to necessary safeguards. Eight cumulative conditions connect voluntary, unanimous author opt-in, journal permission, a rights-cleared public package, round-specific synchronisation, service eligibility, disclosure, human accountability and redress, and exclusion of non-public editorial information. Synchronisation supplies complete, same-version context for checking consequential criticisms without requiring full-manuscript input for every task. An optional open pre-review pilot permits contributions before formal reviewer appointment while preserving invited review. Comparisons separate public access, participation, and AI provision across confidentiality, retention and training, model change, auditability, burden, equity, and complementary questioning. Approved external assistance may support contributors without journal-provided internal-AI accounts; its value depends on voluntary uptake, usable support, contribution quality, and total burdens relative to feasible alternatives. Two-level eligibility checks, proportionate records, staged publication, and independent redress make the proposal inspectable. Effects remain untested. The result is a design for comparative evaluation, not a validated standard, a claim of superiority over internal assistance, or permission to disregard existing policies.

Metrics

27 October 2026

  • Article
  • Open Access

Semantic-Enabled Visual Analytics for Explainable Research Evaluation in Higher Education

  • Evangelia Triperina,
  • Adamantia Psallidakou and
  • Anastasios Tsolakidis

The increasing complexity of evaluation in the higher education setting, along with the growing availability of diverse data sources, has emphasized the need for more transparent and interpretable assessment processes and results. Current evaluation systems frequently depend on fragmented indicators and black-box procedures, hindering evidence-based decision-making. To address these challenges, this study proposes a framework that integrates semantic web technologies, visual analytics and multiple-criteria decision analysis. An ontology is developed to capture evaluation dimensions, criteria, indicators and relationships, enabling interoperability among heterogeneous data sources, including bibliometric databases, institutional repositories, and open science infrastructures. The framework further incorporates a multicriteria method to support transparent weighting and aggregation of evaluation criteria, as well as interactive visual analytics mechanisms designed according to cognition-informed principles. It was applied within a higher education evaluation scenario to support the integration, analysis, and interpretation of multidimensional assessment data. The framework was evaluated using a dataset comprising seven (7) evaluation entities, covering fifty-two (52) evaluation criteria across five (5) dimensions, a cross-cutting dimension and the overall ranking. The ontology-based ELECTRE III analysis involved twenty-one (21) pairwise comparisons and produced seven (7) final ranking positions, with no initial incomparable pairs requiring resolution. At the dimension level, 30 ranking positions were obtained from 105 pairwise comparisons, resulting in five (5) incomparable pairs, four (4) of which were resolved through the proposed SDR mechanism. These results demonstrate the framework’s ability to differentiate the evaluated entities at both the overall and dimension levels while providing an explicit mechanism for resolving ranking incomparabilities. The application aims to facilitate the integration of heterogeneous evaluation data sources, preserve an auditable decision trail, improve the transparency of evaluation procedures, and enhance the interpretation of complex evaluation outcomes. The proposed framework contributes to explainable academic evaluation by combining semantic modeling, decision support, and visual analytics, supporting more informed and transparent institutional decision-making.

Metrics

20 October 2026

  • Article
  • Open Access

In deciding whether to accept or reject one theory rather than another, scientists often look at the evidence that agrees or disagrees with each theory. We formalize this method of comparison in terms of a 2-by-2 matrix where rows are the theories being compared and the columns the extent of agreement or disagreement with evidence. Illustrating this approach with two examples from the history of science, we show under what conditions scientific decisions to support a theory conform with Bayes’ theorem. For example, when a scientist decides that the theory with the most empirical support, or the fewest empirical failures, is the correct one, are they conforming to the rules of Bayesian confirmation? We show by a random simulation that often only a single comparison of agreements or disagreements, successes or failures, is consistent with Bayes’ theorem. This means that many scientists’ decisions to support or reject theories are consistent with Bayes’ theorem without their being aware of it.

Metrics

13 October 2026

Featured Articles of Last Quarter

Rhetorical–semantic metric framework for scientific abstracts. Sentences are assigned to rhetorical roles, embedded as vectors, and summarized through role-specific centroids. The framework derives four metric families: local continuity, within-role consistency, cross-role alignment, and opening-frame return. Cosine similarity quantifies semantic proximity between sentence or centroid embeddings.
PRISMA Flow diagram of study selection process.

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Metrics - ISSN 3042-5042