Energy Efficiency in Cloud Computing: Exploring the Intellectual Structure of the Research Field and Its Research Fronts with Direct Citation Analysis.

The aim of the study is to explore the intellectual structure of the field and fronts in research on energy efficiency in the context of cloud computing and thus to contribute to science mapping of the research field. The research process was driven by the following study questions: (1) what are the most influential publications in the research field? and (2) what are the research fronts in the research field? The method of direct citation analysis was employed in the research process. Data for analysis were obtained from the Scopus database and analyzed with the use of VOSviewer science mapping software. In response to the first question, we identified the most influential publications in the research field and analyzed their types (i.e., whether they are original research papers or rather the "context" papers e.g., survey or review papers, framework papers, challenges papers, and study papers). Moreover, a comparison analysis between the types of papers among the most cited "classical" publications and "emerging stars" was conducted. In response to the second research question, we identified five research fronts concentrated around the issues of: virtual machine management ("VM"); task-focus, concerning data replication, task consolidation, and task scheduling ("task"); energy efficiency ("energy"); modelling and optimization ("model"); and energy efficiency in the networking context ("network"). [ABSTRACT FROM AUTHOR]