Dr. Taku Onishi graduated from Osaka University in 1998 and received his Ph.D. from the same university in 2003. He has been working at Mie University since 2003 and has been a guest researcher at the University of Oslo since 2010. The title of invited professor was given from The University of Ryukyus in 2021.His research focuses on quantum chemistry, computational chemistry, quantum physics, and material science. His book “Quantum Computational Chemistry—Modelling and Calculation for Functional Materials” was published by Springer in 2017.He is a member of the Royal Society of Chemistry; the chair of the Computational Chemistry (CC) Symposium; a member of the science committee of the International Conference of Computational Methods in Sciences and Engineering (ICCMSE); and a member of the editorial board of Cogent Chemistry, the Journal of Computational Methods in Sciences and Engineering (JCMSE), and Cogent Engineering.He has reviewed numerous international proceedings, books, and journals in various research fields.

• Part I Theoretical Background.- 1. Electromagnetism.- 2. Quantum Mechanics.- 3. Quantum Computational Chemistry.- Part II Background of Ferroelectricity.- 4. Basics of Ferroelectricity.- 5. History of Ferroelectric Perovskites.- Part III Origin of Ferroelectricity.- 6. Perovskite Titanium Oxides.- 7. Materials Design.- Part VI Summary and Outlook.- 8. Summary and Future High Speed Memory.