392 research outputs found
Essays in Empirical Labor Economics
No full text148 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000.The third essay (coauthored by Kevin F. Hallock) investigates the relationship between job loss announcements and top-management changes in U.S. firms using detailed data on each published job loss announcement in a broad set of large firms from 1970 to 1995. We begin by confirming the results of previous authors concerning the relationship between relative firm performance and management turnover. Next we consider the effect of job loss announcements on CEO turnover and find a surprising yet robust result; job loss announcements two years in the past are strongly related to top-management changes. We go on to investigate whether this relationship has changed over time, as well as several possible explanations for this finding, including a change in the mix of reasons for job loss announcements and changes in management entrenchment.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Essays in Empirical Labor Economics
No full textThe third essay (coauthored by Kevin F. Hallock) investigates the relationship between job loss announcements and top-management changes in U.S. firms using detailed data on each published job loss announcement in a broad set of large firms from 1970 to 1995. We begin by confirming the results of previous authors concerning the relationship between relative firm performance and management turnover. Next we consider the effect of job loss announcements on CEO turnover and find a surprising yet robust result; job loss announcements two years in the past are strongly related to top-management changes. We go on to investigate whether this relationship has changed over time, as well as several possible explanations for this finding, including a change in the mix of reasons for job loss announcements and changes in management entrenchment.Made available in DSpace on 2015-09-25T22:47:52Z (GMT). No. of bitstreams: 2
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Previous issue date: 2000Embargo set by: Seth Robbins for item 86949
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only148 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000
From the fallen tree : Frontier narratives, environmental politics, and the roots of a national pastoral, 1749-1826.
No full textAnglo-American writers in the revolutionary era used pastoral images to place themselves as native to the continent, argues Thomas Hallock in From the Fallen Tree. Beginning in the mid-eighteenth century, as territorial expansion got under way in earnest, and ending with the era of Indian dispossession, the author demonstrates how authors explored the idea of wilderness and political identities in fully populated frontiers. Hallock provides an alternative to the myth of a vacant wilderness found in later writings. Emphasizing shared cultures and conflict in the border regions, he reconstructs the milieu of Hector St. John de Crevecoeur, Thomas Jefferson, Meriwether Lewis and William Clark, William Bartram, and James Fenimore Cooper, as well as lesser-known figures such as Lewis Evans, Jane Colden, Anne Grant, and Elias Boudinot. State papers, treaty documents, maps, and journals provide a rich backdrop against which Hallock reinterprets the origins of a pastoral tradition. Combining the new western history, ecological criticism, and native American studies, Hallock uncovers the human stories embedded in descriptions of the land. His historicized readings offer an alternative to long-accepted myths about the vanishing backcountry, the march of civilization, and a pristine wilderness. The American pastoral, he argues, grew from the anxiety of independent citizens who became colonizers themselves.https://digitalcommons.usf.edu/books/1071/thumbnail.jp
‘Joy! Rapture! I've Got a Brain!’
No full text The following essay was originally published in The Chronicle of Higher Education on 14 May 2004. The essay examines the motivation, and the self-doubt, that propels much academic writing. Drawing upon personal experience (and with a nod to The Wizard of Oz), author Thomas Hallock maintains that many scholars write in order to overcome their own insecurities. </jats:p
Bringing together policymakers, researchers, and practitioners to discuss job loss
No full textUnemployment ; Displaced workers
Diffusion tensor spectroscopy and imaging of the arcuate fasciculus
No full textThe arcuate fasciculus (AF) is a fiber pathway in the human brain relevant for language processes and has recently been characterized by means of diffusion tensor tractography. The observations made concerning the left and right hemisphere AF include a characterization of the trajectories and quantification of physical properties such as fractional anisotropy, DTI-based fiber density and volume. However, these observations were based on the diffusion of water, which is not particular to either the intra- or extra-axonal compartments, and thus its usefulness for tissue characterization is limited. If the diffusion properties and in turn the geometric properties of only one tissue compartment can be isolated and characterized, a better microstructural characterization of AF is possible. In this study, water-based diffusion tensor probabilistic mapping was first implemented to segment the AF. Subsequently, diffusion tensor spectroscopic measurements of N-acetyl aspartate (NAA) were performed to measure the intra-axonal specific diffusion in left and right AF. Diffusion properties of NAA, which solely reflect the intra-axonal space, indicated possible leftward asymmetry in axonal diameter, where those of water, which are not compartment-specific, showed laterality to a lesser extent. (C) 2007 Elsevier Inc. All rights reserved
Diffusion properties of NAA in human corpus callosum as studied with diffusion tensor spectroscopy
No full textIn diffusion tensor imaging (DTI) the anisotropic movement of water is exploited to characterize microstructure. One confounding issue of DTI is the presence of intra- and extracellular components contributing to the measured diffusivity. This causes an ambiguity in determining the underlying cause of diffusion properties, particularly the fractional anisotropy (FA). In this study an intracellular constituent, N-acetyl aspartate (NAA), was used to probe intracellular diffusion, while water molecules were used to probe the combined intra- and extracellular diffusion. NAA and water diffusion measurements were made in anterior and medial corpus callosurn (CC) regions, which are referred to as R1 and R2, respectively. FA(NAA) was found to be greater than FA(Water) in both CC regions, thus indicating a higher degree of anisotropy within the intracellular space in comparison to the combined intra- and extracellular spaces. A decreasing trend in the FA of NAA and water was observed between R1 and R2, while the radial diffusivity (RD) for both molecules increased. The increase in RD(NAA) is particularly significant, thus explaining the more significant decrease in FA(NAA) between the two regions. It is suggested that diffusion tensor spectroscopy of NAA can potentially be used to further characterize microscopic anatomic organization in white matter
Changes in Job Stability and Job Security: A Collective Effort to Untangle, Reconcile, and Interpret the Evidence
No full textI synthesize and summarize a set of recent papers on changes in the employment relationship. The authors of these papers present the most up-to-date and accurate assessment of their evidence on changes in job stability and job security, and attempt to reconcile their evidence with the findings of other research, including the other papers discussed herein. Some of papers also begin to explore explanations of changes in the employment relationship. The evidence suggests that the 1990's witnessed some changes in the employment relationship consistent with weakened bonds between workers and firms. But the magnitudes of these changes indicate that while these bonds may have weakened, they have not been broken. Furthermore, the changes that occurred in the 1990's have not persisted very long. It is therefore premature to infer long-term trends towards declines in long-term employment relationships, and even more so to infer anything like the disappearance of long-term, secure jobs. The papers examining sources of changes in job stability and job security in the 1990's point to some potential explanations, including relative wage movements, growth in alternative employment relationships, and downsizing. However, with the possible exception of the first of these, this list does not encompass fundamental' or exogenous changes impacting the employment relationship, but rather to some extent suggests how various changes in the employment relationship may reinforce each other. Understanding the structural changes underlying empirical observations on changes in job stability and job security is likely to be a fruitful frontier for future research on the employment relationship.
A novel 240-gbps channel-by-channel dedicated optical protection ring network using wavelength selective switches
No full text- …
