Anatomy of Learning-from-Exporting: Role of foreign knowledge acquisition

The essence of learning-from-exporting can be thought of as a process in which exporters absorb international knowledge spillovers and feed it back to their innovation efforts. Learning-from-exporting is often difficult to observe because it is conditional on at least two efforts: information gathering from foreign markets and zealous R&D. We exploit unique survey data to explicitly analyze the contribution of these activities to exporters' innovation. We find that gathering information from foreign markets significantly raises exporters' probability of succeeding in technology upgrades or new product developments, along with their R&D activities. While learning about the latest foreign technology and competitor products is at the core of such knowledge acquisition, international marketing activities, such as gathering feedback from foreign customers or information on the taste and needs of foreign customers, is also associated with a significant contribution. The importance of foreign knowledge acquisition is also confirmed for exporters that do not serve high-income markets or those that supply intermediate goods. Although it is likely that the acquisition of foreign knowledge contributes to exporters' innovation strategies, such as where to allocate R&D resources, it does not seem to raise the marginal effectiveness of R&D.

Export and Productivity Under Different Market Condition: Evidence from Japan

We use a large dataset of Japanese manufacturing firms to compare the effects of export entry on productivity under different export market conditions. Using the established econometric procedures of Propensity Score Matching and Difference-in-Differences, we explicitly estimate the effects of export entry during two periods with fairly different export market conditions: from 2002 to 2005, corresponding to the earlier period of global economic expansion that ended in 2007, and from 1998 to 2001, the period which witnessed the aftermath of the Asian financial crisis. We find that export entry is associated with significantly higher ex-post productivity growth vis-�-vis non-entrants only during the period with favourable export market conditions. We also find that such advantage in productivity growth is long lasting and is found only for entrants exporting to high-income markets. Furthermore, export entry is associated with higher growth in R&D expenditure only during this period. These findings suggest that the effect of export entry in enhancing productivity growth, sometimes referred to as "learning-by-exporting," depends on good market conditions.

Disorder-induced rapid localization of electron-hole plasmas in highly excited InxGa1-xN mixed crystals

In mixed semiconductor crystals, random potential fluctuations cause localized band-tail states below the band edge and control the optical spectrum and dynamics. We report the influence of these band-tail states on the dynamics of electron-hole plasmas in highly excited InxGa1−xN mixed crystals. Temporal changes in the luminescence spectrum of InxGa1−xN mixed crystals and their band-gap renormalization are completely different from those of GaN crystals. Our findings show that holes are rapidly localized at band-tail states and that electron plasmas in the extended states determine the luminescence properties and band-gap renormalization of InxGa1−xN mixed crystals

Dynamics of biexciton localization in AlxGa1-xN mixed crystals under exciton resonant excitation

We report the localization dynamics of biexcitons in AlxGa1−xN mixed crystals under exciton resonant excitation at low temperatures. During a few tens of picoseconds just after intense laser excitation, the photoluminescence (PL) spectral shape obeys an inverse Maxwell–Boltzmann distribution and free biexcitons dominate the PL spectrum. With a further increase in the delay time, the biexciton PL peak energy and edge energy shift to lower energies. These redshift behaviors in AlxGa1−xN mixed crystals are completely different from the behaviors of free biexcitons in GaN crystals. Our observations reveal the rapid transformation dynamics from free to localized biexcitons in band-tail states in AlxGa1−xN mixed crystals

The investigation into the Ice shelf-Ocean Interaction of East Antarctica with special focusing on the Ocean Circulation

The Tenth Symposium on Polar Science/Special session: [S] Future plan of Antarctic research: Towards phase X of the Japanese Antarctic Research Project (2022-2028) and beyond, Tue. 3 Dec. / 2F Auditorium, National Institute of Polar Researc

Characteristics of bottom boundary mixing across the shelf edge off Cape Darnley, Antarctica

第2回極域科学シンポジウム/第34回気水圏シンポジウム 11月17日（木） 統計数理研究所 セミナー室