Daniel Kim 
KAIST, Republic of Korea
April 24th, 2015
Evolution of Technology Category Network
Basic Terms
- Node
- 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.
- Link
- 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.
- Technology category
- A technology category has technology subcategories. A technology subcategory has technology classification.
- Technology code
- A technolgoy code consists of a classification code and a subclassification code
Note
- Usage
- 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”
- “Cleaning Products”
- “Apparel & Textile”
- “Earth Working & Wells”
- “Furniture, House Fixtures”
- “Heating, refrigeration and Ventilation”
- “Pipes & Joints”
- “Receptacles”
- “Structures”
- “Horology”
- “Education & Demonstration”
- “Miscellaneous-Others”
- The category, "NewTech", has following subcategories.
- “ATM Technology”
- “Robots”
- “Nanotech”
Reference
- Hall, Bronwyn H., A. B. Jaffe, and M. Tratjenberg. "The NBER US Patent Citations Data File." NBER Working Paper 8498 (2001).