Abstract
The core and the non-core technology fields for each industry were identified. Then, R&D activities of the Japanese firms were analyzed at industry level using the matrix data sets of R&D expenditure and patent application on the core / non-core framework. The result suggests that the patent application should be the same input indicator as R&D expenditure of the R&D activity in the case for core technology field of high-tech industry. This relation is explained using the novel R&D model and through the case studies.
