Bin Xu

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The effects of technical progress on relative factor prices in the two-country, two-good, two-factor Heckscher-Ohlin model are investigated. Technical progress is classified according to factor-augmenting bias, factor-using bias, and sector bias. A complete set of relations between technical progress parameters and relative factor prices, depending on the(More)
We propose an efficient method for updating a path that was computed using level-set methods. Our approach is suitable for autonomous vehicles navigating in a static environment for which an a priori map of the environment is inaccurate. When the autonomous vehicle detects a new obstacle, our algorithm replans an optimal route without recomputing the entire(More)
This paper examines international trade and foreign direct investment as channels for technology diffusion among industrialized countries. We find strong empirical support for capital goods trade as a channel for international technology diffusion and some evidence that multinational enterprises (outward FDI) transmit foreign technology back to the home(More)
Estimation of Rybczynski e®ects in a sample of 14 developing countries over 1982-1992 reveals a puzzle: labor-intensive manufacturing sectors tend to expand and capital-intensive manufacturing sectors contract as country capital abundance increases, after allowing for changes in technology, skill, and trade barrier. Empirical tests show strong evidence of(More)
For an autonomous vehicle navigating in a static environment for which an a priori map is inaccurate, we propose a hybrid receding horizon control method to determine optimal routes when new obstacles are detected. The hybrid method uses the level sets of the solution to either a global or local Eikonal equation in the formulation of the receding horizon(More)
We address the minimal risk motion planning problem in a two dimensional environment in the presence of both moving and static obstacles. Our approach is inspired by recent results due to Vladimirsky [20] in which path planning on time-varying maps is addressed using a new level-set approach, and for which computational costs are remarkably low. Toward(More)
Towards the goal of achieving truly autonomous navigation for a surface vehicle in maritime environments, a critical task is to detect surrounding obstacles such as the shore, docks, and other boats. In this paper, we demonstrate a real-time vision-based mapping system which detects and localizes stationary obstacles using a single omnidirectional camera(More)
a r t i c l e i n f o This paper examines the impacts of industrialization and urbanization on CO 2 emissions in China using nonparametric additive regression models and provincial panel data from 1990 to 2011. The empirical results show that there is an inverted U-shaped nonlinear relationship between industrialization and CO 2 emissions in the three(More)
Autonomous operation by a surface vehicle in a maritime setting requires that the surface vehicle detects non-water objects, including shoreline, hazards to navigation, and other moving vessels. In order to assess the utility of an omnidirectional camera for detecting and localizing non- water objects, we rigorously investigate observability of both(More)