Figure 7
A scatter plot representing the relationship between relevance degree (centrality) on the horizontal axis and development degree (density) on the vertical axis. The plot is divided into four quadrants: Niche Themes, Motor Themes, Basic Themes, and Emerging or Declining Themes. Each quadrant contains clusters of keywords. In the Niche Themes quadrant, keywords include analytical hierarchy process and maritime transportation. The Motor Themes quadrant features keywords such as students, maritime industry, and teaching. The Basic Themes quadrant includes keywords like ships, digital transformation, and supply chains. The Emerging or Declining Themes quadrant contains keywords such as marine engineering. Thematic map of keywords clusters, generated using Biblioshiny (“Thematic Map” function), based on dataset of 46 peer-reviewed articles. The map displays centrality and density of topic clusters across the corpus