Using data from 24 OECD countries, we find that the relationship between a country＇s R＆D investment and technological advantage in a sector （measured by the country＇s labor productivity of the sector relative to t...Using data from 24 OECD countries, we find that the relationship between a country＇s R＆D investment and technological advantage in a sector （measured by the country＇s labor productivity of the sector relative to the rest of the world） is non-monotonic. In particular, for countries whose technology levels are much lower or higher than the rest of the world in a sector, their sectoral R＆D investment declines as their advantages in the sector improve; for counties with middle technology levels, the opposite is true. Extending the Eaton and Kortum framework, we develop a static model to theoretically analyze the relationship between R＆D investment and technological advantages. We show that when the research efficiency in a sector is sufficiently elastic with respect to the sectoral technological advantage, a country＇s R＆D investment increases with its technological advantage, and vice versa.展开更多
To efficiently meet the increasing demands for mobile broadband, Ultra Mobile Broadband (UMB) is designed to complement 3G deployments. It is equipped with all the necessary features for optimal support of real-time a...To efficiently meet the increasing demands for mobile broadband, Ultra Mobile Broadband (UMB) is designed to complement 3G deployments. It is equipped with all the necessary features for optimal support of real-time and best-effort traffic with seamless mobility. This article overviews the UMB technology, and discusses its competitive advantages, which are fast time to market, flexible deployment options, inherently designed for real-time services and flexible IP-based network architecture. Moreover, the article analyzes key UMB design features, including Orthogonal Frequency Division Multiple Access (OFDMA), advanced antenna techniques, Reverse Link (RL) sector capacity optimization, adaptive interference management mechanisms, efficient RL control design, low-overhead signaling, fast seamless handoffs, multi-carrier support and beacons, enhanced terminal battery life, and flexible IP-based network architecture. UMB is well suited to be at the center of the future that melds broadband applications with faster, more capable mobile multimedia devices. UMB’s competitive advantages provide operators with continuous differentiation today and tomorrow.展开更多
文摘Using data from 24 OECD countries, we find that the relationship between a country＇s R＆D investment and technological advantage in a sector （measured by the country＇s labor productivity of the sector relative to the rest of the world） is non-monotonic. In particular, for countries whose technology levels are much lower or higher than the rest of the world in a sector, their sectoral R＆D investment declines as their advantages in the sector improve; for counties with middle technology levels, the opposite is true. Extending the Eaton and Kortum framework, we develop a static model to theoretically analyze the relationship between R＆D investment and technological advantages. We show that when the research efficiency in a sector is sufficiently elastic with respect to the sectoral technological advantage, a country＇s R＆D investment increases with its technological advantage, and vice versa.
文摘To efficiently meet the increasing demands for mobile broadband, Ultra Mobile Broadband (UMB) is designed to complement 3G deployments. It is equipped with all the necessary features for optimal support of real-time and best-effort traffic with seamless mobility. This article overviews the UMB technology, and discusses its competitive advantages, which are fast time to market, flexible deployment options, inherently designed for real-time services and flexible IP-based network architecture. Moreover, the article analyzes key UMB design features, including Orthogonal Frequency Division Multiple Access (OFDMA), advanced antenna techniques, Reverse Link (RL) sector capacity optimization, adaptive interference management mechanisms, efficient RL control design, low-overhead signaling, fast seamless handoffs, multi-carrier support and beacons, enhanced terminal battery life, and flexible IP-based network architecture. UMB is well suited to be at the center of the future that melds broadband applications with faster, more capable mobile multimedia devices. UMB’s competitive advantages provide operators with continuous differentiation today and tomorrow.
