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2. 2）International Data Corporation: “The Digitization of the World from Edge to Core”, An IDC White Paper, #US44413318, p.3（2018）
3. 3）Micron Press Releases: “Micron Commences Volume Production of 1z Nanometer DRAM Process Node”, http://investors.micron.com/news-releases/news-release-details/micron-commences-volume-production-1z-nanometerdram-process
4. 4）C. Siau, et al.: “A 512 Gb 3-bit/Cell 3D Flash Memory on 128-Wordline-Layer with 132Mbps Write Performance Featuring Circuit-Under-Array Technology”, D. Tech. Paper ISSCC 2019, 13.5, pp.218-220（2019）
5. 5）Western Digital Press Releases: “Western Digital Unveils Next-Generation Technology to Preserve and Access the Next Decade of Big Data”, https://www.westerndigital.com/company/newsroom/press-releases/2017/2017-10-11-western-digital-unveils-next-generation-technology-to-preserve-and-access-the-next-decade-of-big-data