MISSPECIFICATION IN SIMULTANEOUS SYSTEMS: AN ALTERNATIVE TEST AND ITS APPLICATION TO A MODEL OF THE SHRIMP MARKET

Concern over the effects of public policies based on misspecified econometric models motivates interest in a procedure to test, diagnose, and improve the specification of models that have been estimated with three-stage least squares. A test of system-wide specification based on Hausman's specification test is employed in a test of the a priori restrictions placed on the parameters of a structural model of the U.S. shrimp market. The null hypothesis of proper specification is rejected. After diagnosis via a comparison of unrestricted and restricted reduced forms and respecification, the null hypothesis cannot be rejected.Research Methods/ Statistical Methods,

Epitaxial Frustration in Deposited Packings of Rigid Disks and Spheres

We use numerical simulation to investigate and analyze the way that rigid disks and spheres arrange themselves when compressed next to incommensurate substrates. For disks, a movable set is pressed into a jammed state against an ordered fixed line of larger disks, where the diameter ratio of movable to fixed disks is 0.8. The corresponding diameter ratio for the sphere simulations is 0.7, where the fixed substrate has the structure of a (001) plane of a face-centered cubic array. Results obtained for both disks and spheres exhibit various forms of density-reducing packing frustration next to the incommensurate substrate, including some cases displaying disorder that extends far from the substrate. The disk system calculations strongly suggest that the most efficient (highest density) packings involve configurations that are periodic in the lateral direction parallel to the substrate, with substantial geometric disruption only occurring near the substrate. Some evidence has also emerged suggesting that for the sphere systems a corresponding structure doubly periodic in the lateral directions would yield the highest packing density; however all of the sphere simulations completed thus far produced some residual "bulk" disorder not obviously resulting from substrate mismatch. In view of the fact that the cases studied here represent only a small subset of all that eventually deserve attention, we end with discussion of the directions in which first extensions of the present simulations might profitably be pursued.Comment: 28 pages, 14 figures; typos fixed; a sentence added to 4th paragraph of sect 5 in responce to a referee's comment

Supplement to "Distributed Quota Enforcement for Spam Control"

This report is a supplement to our paper "Distributed Quota Enforcement forSpam Control" (NSDI 2006). We assume here that the reader has readthe main paper. In this report, we first analyze the enforcer nodes'key-value maps and then analyze two of the experiments from the main paper

Gravin orchestrates protein kinase A and 2-adrenergic receptor signaling critical for synaptic plasticity and memory

A kinase-anchoring proteins (AKAPs) organize compartmentalized pools of protein kinase A (PKA) to enable localized signaling events within neurons. However, it is unclear which of the many expressed AKAPs in neurons target PKA to signaling complexes important for long-lasting forms of synaptic plasticity and memory storage. In the forebrain, the anchoring protein gravin recruits a signaling complex containing PKA, PKC, calmodulin, and PDE4D (phosphodiesterase 4D) to the β2-adrenergic receptor. Here, we show that mice lacking the α-isoform of gravin have deficits in PKA-dependent long-lasting forms of hippocampal synaptic plasticity including β2-adrenergic receptor-mediated plasticity, and selective impairments of long-term memory storage. Furthermore, both hippocampal β2-adrenergic receptor phosphorylation by PKA, and learning-induced activation of ERK in the CA1 region of the hippocampus are attenuated in mice lacking gravin-α. We conclude that gravin compartmentalizes a significant pool of PKA that regulates learning-induced β2-adrenergic receptor signaling and ERK activation in the hippocampus in vivo, thereby organizing molecular interactions between glutamatergic and noradrenergic signaling pathways for long-lasting synaptic plasticity, and memory storage

Saint Vincent de Paul and the Mission of the Institute for Business and Professional Ethics: Why Companies Should Care About Poverty

The mission of DePaul University’s Institute for Business and Professional Ethics (IBPE) is “to encourage ethical deliberation among decision makers by stirring the moral conscience, encouraging moral imagination, and developing models for moral decision-making in business.” In 2006, it added an element: “to inspire companies to address poverty reduction both globally and locally through for-profit initiatives.” The authors make the following assertions: “(1) the poor do not lack resources; (2) poverty alleviation is an evolving, dynamic process; (3) poverty often results from patterns of exclusion; and (4) many feasible approaches to poverty reduction have been and can be created through commerce.” The thinking behind this is explained and illustrated with specific cases. Connections between these propositions and Vincent de Paul’s legacy are made explicit

Racist or Radical? The Strange Case of Robert Moses and the Building of New York City\u27s Aquatics Infrastructure

Who was Robert Moses? In this article, we want to cast a bright light on Robert Moses as a visionary urban planner, which included the comprehensive planning of the outdoor and indoor aquatic infrastructure for New York City. Second, we want to highlight some of his administration\u27s significant accomplishments and challenges in providing aquatics opportunities for diverse populations, including people of color. Finally, we aspire to illustrate what happens when officials with power and authority in local government are permitted to operate without scrutiny and are unbeholden to a meaningful series of checks and balances. Robert Moses’ tenure as a 40-year-plus appointed public official highlighted the need for accountability in public service. During his expansive career, Moses held more than 12 bureaucratic appointments, sometimes concurrently, allowing him to drive his infrastructure development agenda funded by the WPA mercurially. His herculean list of accomplishments included parks, highways, 11 large swimming pools, civic centers, sports stadiums, 13 bridges, 658 playgrounds, 416 miles of parkway, 150,000 units of public housing, and the 1964-65 World’s Fair, which cost in today\u27s economy approximately $150 billion (Adiv, 2015). One of the central jewels in the crown of his accomplishments was the planning, design, and construction of the outdoor and indoor swimming infrastructure of New York City. Unfortunately, many of Moses\u27 achievements were overshadowed by allegations of racial politics, a lack of accountability for his decisions and policy actions, and reports of his disdain for blacks, Puerto Ricans, and low-income people. He was also called dictatorial, power-hungry, and vindictive during his long tenure in public service. Moses was rebuked for his lack of inclusion in planning processes and making resource allocation decisions based on the racial composition of a community

Transitions to Proton States in the 90-Zr(p,p') Reaction at 160 MeV

This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit

Excitation of Neutron, Proton and Neutron-Hole States in the (p,p') Reaction at 160 MeV and 96 MeV

This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit