KAIST, Republic of Korea
April 24th, 2015
Evolution of Technology Category Network
Each node indicates a technology category. 11 technology categories are used.
The size of each node is proportional to the number of co-occurrences between technology codes which belong to same category in a year.
The thickness of each link represents its weight, indicating the number of co-occurrences between technology codes which belong to different technology categories in a year.
A technology category has technology subcategories. A technology subcategory has technology classification.
A technolgoy code consists of a classification code and a subclassification code
Highlight neighbors: please move your mouse cursor around a node/circle.
Year change: please move your mouse cursor around 4-digit numeric year text.
The category, "Others", has following subcategories.
“Printing, Printed Matter & Typesetting”
“Agriculture, Husbandry, Food”
“Apparel & Textile”
“Earth Working & Wells”
“Furniture, House Fixtures”
“Heating, refrigeration and Ventilation”
“Pipes & Joints”
“Education & Demonstration”
The category, "NewTech", has following subcategories.
Hall, Bronwyn H., A. B. Jaffe, and M. Tratjenberg. "The NBER US Patent Citations Data File." NBER Working Paper 8498 (2001).