We review the history, current status, and prospects of research on rare-earth barium copper oxide (REBa₂Cu₃O_y) coated conductors. Three major issues were addressed to achieve critical current performance for long-coated conductors of several hundred meters. Special functional performances, e.g., in-field critical current, were greatly improved. Applications of coated conductors were also initiated. We expect applications to appear in the near future.

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Due to advances in information technology, we predicted the widespread decline of barcodes as an information tool. Instead, we developed QR codes, to replace barcodes, using image recognition techniques. We have made innovation to QR codes to meet market needs. To popularize QR codes, we made QR codes available to the public and have formed a market in cooperation with many companies. As a result, QR codes have been used to improve work efficiency and convenience. QR codes are currently available as a communication tool for people all over the world.

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All-solid-state lithium secondary batteries are attracting attention as a next-generation technology. To realize this technology, it is important to develop a new solid-state lithium-ion conductor. In this regard, we discuss the development of all-solid-state secondary lithium batteries using single-crystal solid electrolytes and the AD method.

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Feasible countermeasures are needed to address soil and groundwater contamination problems, because of its impact on human health and socioeconomic activities. Soil and groundwater contamination is a complex issue that requires an interdisciplinary effort involving research into contaminants, their practical removal, and social implementation. This paper discusses several areas of research that the author has been involved in this regard.

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