Centerscope

Centerscope, formerly Scope, was published by the Boston University Medical Center "to communicate the concern of the Medical Center for the development and maintenance of improved health care in contemporary society.

An on-line system for utilizing hand-printed input Progress report

Flow charts for recognizing hand printed characters on-line in real time operatio

Improving Immigration Adjudications through Competent Counsel

The immigration adjudication system in the United States is in serious need of reform. While much attention has focused on one of the principal adjudicators, the Immigration Judges, recent research conducted by Philip Schrag, Jaya Ramji-Nogales, and Andrew Schoenholtz has shown that policymakers and adjudicators should be examining all levels of decision making. This includes not only decisions at the Immigration Court level but also at the Asylum Office, the Board of Immigration Appeals and the Circuit Courts. In Refugee Roulette: Disparities in Asylum Adjudication, the authors found a troubling degree of inconsistency at all levels that track individual merits decisions

Uncovering the mechanism of the impurity-selective Mott transition in paramagnetic V2_{2}O3_{3}

While the phase diagrams of the one- and multi-orbital Hubbard model have been well studied, the physics of real Mott insulators is often much richer, material dependent, and poorly understood. In the prototype Mott insulator V$_{2}$O$_{3}$, chemical pressure was initially believed to explain why the paramagnetic-metal to antiferromagnetic-insulator transition temperature is lowered by Ti doping while Cr doping strengthens correlations, eventually rendering the high-temperature phase paramagnetic insulating. However, this scenario has been recently shown both experimentally and theoretically to be untenable. Based on full structural optimization, we demonstrate via the charge self-consistent combination of density functional theory and dynamical mean-field theory that changes in the V$_{2}$O$_{3}$ phase diagram are driven by defect-induced local symmetry breakings resulting from dramatically different couplings of Cr and Ti dopants to the host system. This finding emphasizes the high sensitivity of the Mott metal-insulator transition to the local environment and the importance of accurately accounting for the one-electron Hamiltonian, since correlations crucially respond to it.Comment: 5 pages, 5 figures, supplementary informatio

International R&D Spillovers Between U.S. and Japanese R&D Intensive Sectors

A great deal of empirical evidence shows that a country's production structure and productivity growth depend on its own R&D capital formation. With the growing role of international trade, foreign investment and international knowledge diffusion, domestic production and productivity also depend on the R&D activities of other countries. The purpose of this paper is to empirically investigate the bilateral link between the U.S. and Japanese economies in terms of how R&D capital formation in one country affects the production structure, physical and R&D capital accumulation, and productivity growth in the other country. We find that production processes become less labor intensive as international R&D spillovers grow. In the short-run, R&D intensity is complementary to the international spillover. This relationship persists in the long-run for the U.S., but the Japanese decrease their own R&D intensity. U.S. R&D capital accounts for 60% of Japanese total factor productivity growth, while Japanese R&D capital contributes 20% to U.S. productivity gains. International spillovers cause social rates of return to be about four times the private returns.

Does Knowledge Intensity Matter? A Dynamic Analysis of Research and Development, Capital Utilization and Labor Requirements

In this paper we have developed a dynamic analysis of a firm under-taking research and development (R&D) investment, physical capital accumulation and utilization, along with labor requirement decisions. Empirical work has found that there are significant costs to develop knowledge. Consequently, R&D capital is treated as a quasi-fixed factor, along with the traditional physical capital stock. A number of empirically relevant implications arise from the analysis. It is shown that along the dynamic path as the R&D intensity of physical capital increases, knowledge per worker rises and the utilization rate of physical capital decreases. We distinguish between the intertemporal movement of the firm,and the response to unanticipated changes in demand and cost conditions. An increase in product demand causes the firm to increase both the R&D growth rate and the labor intensity of R&D capital. Contrary to a viewpoint held by many,the R&D investment does not displace labor. Finally, our model provides a framework to justify the empirically observed direct relationship between the physical capital growth and utilization rates.

Research and Development, Utilization and Labor Requirements: A Dynamic Analysis

In this study we have developed a dynamic analysis of a firm under taking plant and equipment and research and development investment,along with labor requirement and P&E utilization decisions. It is shown that in the short run increases in R&D cause the utilization rate of plant and equipment to rise and to decrease demand for labor per unit of R&D. We distinguish between the effects of the stock of R&D and the investment flow. The short run effect of changes in the stock of R&Don labor demand are quite distinct from the behavior observed along the intertemporal path. Along the path increases in the R&D investment rate must be accompanied by an increase in the labor requirement per unitof R&D. Contrary to a view point held by many, the R&D investment flow does not displace labor. Finally, our model provides a framework to justify the empirically observed positive relationship between the utilization and the P&E investment rates.

Financing and Investment in Plant and Equipment and Research and Development

In this stuy a dynamic model of firm behavior is developed which integrates real and financial decisions. The model combines the effects of capital structure and input adjustirent costs on the process of capital accumulation. The existence, uniqueness and stability conditions of the long-run eguilibrium and the dynamic properties of the factor demand are explored. The equations derived from the theoretical model are estimated using firm cross-section time series data. The results indicate that for both Plant and Equipment (P&E) and Research and Development (R&D),the debt-eguity ratio significantly affects the investment demands and the elasticities are highly inelastic. The effect is stronger for P&E than for R&D capital in the long run, while the effects on P&E and R&D investment are quite similar in the short run.

Product Demand, Cost of Production, Spillovers, and the Social Rate of Return to R&D

The purpose of this paper is to develop and estimate a model of production with endogenous technological change. Technological change arises from R&D capital accumulation decisions. These decisions respond to market and government incentives and generate R&D capital spillovers. A spillover network of senders and receivers is estimated. The network shows that each receiving industry is affected by a distinct set of R&D sources and each sending industry affects a unique set of receivers. For the receivers, spillovers generally expand product markets, lower product prices, increase production costs and input demands. For the sources, significant R&D spillovers cause the social rates of return to R&D capital to be substantially above the private returns.