240
241 DRAM DRAM DRAM 1) Vernon 2)
242 DRAM Kim and Lee 3) Large Diversified Firm Small Speicilized Firm DRAM DRAM DRAM Mathews 4) TFT-LCD DRAM DRAM Perez and Soete 5)
243 Lee Lim and Song TV 6) Kim and Lee 7) Kim and Lee Mathews DRAM Perez and Soete Kim and Lee Mathews DRAM DRAM Dosi 8) DRAM Technological Trajectory Dosi
244 Hummon and Doreian 9) Mina et al 10) Verspagen 11) Fontana et al 12) Verspagen Fontana et al. LAN DRAM DRAM DRAM uniform 13)
245 DRAM Lee and Yoon 14) Lee and Yoon Lee and Yoon Lee and Yoon DRAM IT OLED DRAM DRAM
246 vertice edge arc arc pattern 15)
247 citation network analysis force-based algorithm force-based algorithm force-based algorithm force-based algorithm electrically charged particle force-based algorithm Fruchterman and Rheingold Kamada and Kawai 16)
248 irreversible A B B A A B B A acyclic 17) A A loop citation weight main path Hummon and Doreian Hummon and Doreian
249 A B D D E F E F E F source sink arc source sink Pajek Pajek Pajek USPTO DRAM Lee and Yoon USPTO DRAM 18)
250 USPTO Hall and Jaffe NBER patent citation data USPTO NBER patent citation data DRAM DRAM ITRI DRAM ITRI 19)
251
252 20) DRAM
253 IBM IBM ITRI Industrial Technology Research Institute IBM
254 a b
255 DRAM TI Texas Instrument IBM Micron NEC DRAM
256 21) DRAM Micron Perez and Soete DRAM Kim and Lee Mathews Fontana et al LAN Verspagen DRAM LAN
257 22) Micron Mitsubishi Texas Instrument TI IBM SUN AMD VLSI APPLE ITRI UMC TSMC Vanguard
258 Lee and Yoon
259 Pajek 23) ITRI UMC Vanguard TSMC ITRI DRAM Lee and Yoon ITRI 24) ITRI 25) DRAM Fontana et al Verspagen LAN DRAM DRAM
260 DRAM DRAM DRAM
261
262 IBM TI Micron ITRI ITRI ITRI DRAM ITRI
263 26) DRAM Micron DRAM Perez and
264 Soete DRAM ITRI ITRI ITRI LAN DRAM 27) DRAM DRAM
265 DRAM TFT-LCD DRAM Pajek ITRI DRAM DRAM DRAM
266 DRAM 28) DRAM DRAM DRAM Mathews Pajek
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The Journal of Intellectual Property Vol.6 No.3 September 2011 269 Technological Regime and the Shift of Industrial Leadership in the DRAM Industry: A Patent Citation Analyis Minho Yoon Abstract This paper analyzes the citation network of DRAM-related patents focusing on technological change and the shift of market dominance. As a whole, the results of the analysis is consistent with characteristics of the DRAM industry which founded by existing literatures. This founding indicates that a citation network analysis can be an effective in studying technological and industrial change. In addition, through a citation network analysis, we found some features of the DRAM industry that were not found by existing literatures. By visualization of the citation network, three clusters are observed in the citation networks. Cluster 1 formed first, and cluster 2 and 3 followed in order. Cluster 1 is characterized by product innovation, and dominated by American venture firms. Mixture of product and process innovation is characteristics of Cluster 2. Large American and Japanese firms lead formation of Cluster 2. Patents of Cluster 3 are mostly related with process innovation and granted by Micron, Korean large firms and Taiwanese firms. Clusterization means discontinuity of technological change, which can be the reason of the shift of market dominance. The result of main path analysis reveals that the main path of the network goes from Japanese and American firm to Taiwanese firms via ITRI (Industrial Technology Research Institute), Taiwanese government research unit, which is consistent with stylized facts found by existing literatures on the DRAM industry. However, the main path covers only
270 Korea Institute of Intellectual Property Korean Intellectual Society small area of the network. This also can be evidence of technological discontinuity. Keywords DRAM industry, Patent Citation Network, Network Analysis