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Lange, Donald Allen The University of Texas at Austin 2006 해외박사(DDOD)
This dissertation investigates audience responses to organizational action that, while violating audience expectations for consistent and reliable organizational behavior, is ambiguous in terms of its ultimate impact on audiences. The practical situation that I attempt to explain is the reactions to the controversial organizational action of financial restatement by five key audiences of the restating firm (shareholders, institutional investors, securities analysts, the SEC, and customers). A principal argument I develop here is that it is important to consider that audiences react to the controversial action in the context of the organization's history of action. In this dissertation I look at prior action that is consistent with audience interests, and posit that it is not obvious how such prior action will affect audience interpretations of controversy. I examine two categories of prior action that conforms to audience interests---agency-problem mitigation and corporate social responsibility (CSR) action---and I draw on competing perspectives explaining how such prior organizational action might affect audience responses to the controversial action of financial restatement. On the one hand, such prior organizational action might dampen audience negative reactions to the organization's financial restatement. Alternatively, such prior organizational action might aggravate audience negative responses to the restatement. I also predict that such prior organizational action will make it more likely that the restating firm will engage in post-restatement actions with the potential to repair damage to positive audience perceptions, specifically CEO change and board member turnover. And, I predict that post-restatement CEO turnover will dampen audience negative reaction to financial restatement. I test my hypotheses using multiple regression models, employing a two-stage process to first control for the probability that a firm will be among those that restated finances, and then to model the reaction of audiences to the restatement announcement. This dissertation contributes to our understanding of: (1) how prior desirable organizational action influences audience interpretations of controversial action; (2) how post-controversy organizational action influences audience continuing interpretations of controversial action; and (3) the presence of a secondary link between firm CSR action and firm outcomes.
Lange, Jeremy D ProQuest Dissertations & Theses The University of 2021 해외박사(DDOD)
Understanding how natural selection works in nature has been a goal of population geneticists for many decades. This thesis offers an exploration of natural selection in the fruit fly Drosophila melanogaster. In Chapter 1, we present a novel haplotype statistic that assesses whether pairwise haplotype sharing at a locus in one population is unusually large compared with another population relative to genome-wide trends. Using simulation of Drosophila-like parameters, we show that this statistic has power to detect both hard and soft selective sweeps. We demonstrate that its broad utility and computational simplicity makes this a valuable tool to discover instances of recent adaptation. In Chapter 2, we examine the effects of recurrent hitchhiking on demographic inference. We show that neutralist assumptions made by a common demographic inference method is indeed biased by high rates of natural selection, but such biases are weaker for parameters relating recently diverged populations, resolving the utility of estimated demographies. In Chapters 3 and 4, we utilize temporal genetic sampling to study the population genomics of two different populations of D. melanogaster. Studying temporal changes in allele frequencies can better illuminate the role of natural selection on very short time scales. In the first of these studies, the subject of Chapter 3, we use whole genome sequencing of isofemale D. melanogaster lines originally collected 35 years ago and compare genetic variation to modern samples collected from the same location. We reveal recent targets of adaptation to insecticide resistance alleles and uncover a shift toward Northern-associated alleles at well-studied clinal SNPs, possibly due to continued local adaptation favoring alleles of European ancestry in this relatively cool environment. In a second study, the subject of Chapter 4, we analyze genomic data collected from eight museum specimens collected in the 1840s. Comparing these samples with modern populations, we reveal potential targets of recent adaptation, and again find evidence of adaptation of resistance to insecticides. We also show limited evidence that inversions may have been at a lower frequency than modern populations, giving additional evidence to the hypothesis that inversions are a more recent arrival into modern European populations.