Three essays on imperfect competition and exchange rate pass-through in the presence of multiple exchange rates

This dissertation consists of three essays on exchange rates and prices. The first two essays are devoted to theoretical study, and the other is an empirical study. This research analyzes the strategic interactions between international firms. The first essay (chapter II) explores the relationship between price leadership and exchange rate uncertainty. The research investigates the incentives to lead and follow in a model in which exporting firms have the different degrees of exchange rate uncertainty. As exchange rate uncertainty increases, firms will take a flexible strategy as a dominant strategy. Over certain ranges of exchange rate variability, only one firm has a flexible strategy as its dominant strategy, and the other firm is induced to be a price leader, resulting in a dominant strategy Nash-equilibrium. Which firm will be the price leader depends on the mark-up and substitutability of products. The particular attention of this research is also given to the implication of exchange rate variability for exchange rate pass-through;The second essay (chapter III) focuses more on brand loyalty. In many markets, consumers who have previously purchased from one firm have (or perceive) costs of switching to a competitor\u27s product, even when the two firm\u27s products are functionally identical. I explicitly analyze the effect of rival exchange rate for diverse cases (perfect foresight for exchange rates, imperfect foresight for exchange rates, perfect capital mobility, and imperfect capital mobility). In the case of the imperfect foresight, the exchange rate pass-through is affected by the exchange rate uncertainty. Due to the brand loyalty, current price decisions will affect future profits through market shares. The expected future profit is affected by expected competition situations that depend on the interactive movement of future exchange rates;In the last essay (chapter IV), I test the strategic behaviors between exporting firms with simultaneous estimation techniques (three stage least squares). Exchange rate pass-through is estimated, and the effect of the rival exchange rate is emphasized. Also, I demonstrate the problem associated with tests which use trade-weighted exchange rate. Most importantly, this research highlights the importance of market structure in exchange rate pass-through studies

Roles of social capital in tacit knowledge acquisition

Social capital has evolved from an interdisciplinary standpoint. Recently, interests over it have been instigated by entrepreneur literatures because of the arising need to understand its contribution to quality of resource-based management, specifically knowledge-based resources, which provides a great possibility for a successful firm performance. Nevertheless, knowledge and information, just like social capital, are multidimensional in sources and consequences. Scholars have differentiated between tacit and explicit knowledge to clearly present their argument that these two types of knowledge fit various networks of social relations for optimal performance. Therefore, an in-depth investigation of the correlation between social capital and tacit knowledge acquisition is essential to the establishment of a framework that would shed light on the implications of social relations in the corporate world

A thermal model for static current characteristics of AlGaN/GaN high electron mobility transistors including self-heating effect

2005-2006 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Research advances on the anti-aging profile of Fructus lycii: An ancient Chinese herbal medicine

Fructus lycii is a common Chinese herbal medicine used in China for nearly 2000 years. It has beneficial effects on eyes, liver and kidneys; and it has long been considered to be an anti-aging herb in ancient Chinese medicine. Modern studies have partially probed the magic anti-aging property of F. lycii. The beneficial effects of F. lycii on aging are largely attributed to its bioactive components such as polysaccharides, carotenoids and flavonoids. This review focuses on the anti-aging aspect of F. lycii, elaborating the bioactive ingredients accounting for the property, anti-aging pharmacology in terms of its antioxidation capacity, immunomodulative effect and neuroprotective activity. Copyright ©2008 The Berkeley Electronic Press. All rights reserved.published_or_final_versio

Performance of the new automated Abbott RealTime MTB assay for rapid detection of Mycobacterium tuberculosis complex in respiratory specimens

The automated high-throughput Abbott RealTime MTB real-time PCR assay has been recently launched for Mycobacterium tuberculosis complex (MTBC) clinical diagnosis. This study would like to evaluate its performance. We first compared its diagnostic performance with the Roche Cobas TaqMan MTB assay on 214 clinical respiratory specimens. Prospective analysis of a total 520 specimens was then performed to further evaluate the Abbott assay. The Abbott assay showed a lower limit of detection at 22.5 AFB/ml, which was more sensitive than the Cobas assay (167.5 AFB/ml). The two assays demonstrated a significant difference in diagnostic performance (McNemar’s test; P = 0.0034), in which the Abbott assay presented significantly higher area under curve (AUC) than the Cobas assay (1.000 vs 0.880; P = 0.0002). The Abbott assay demonstrated extremely low PCR inhibition on clinical respiratory specimens. The automated Abbott assay required only very short manual handling time (0.5 h), which could help to improve the laboratory management. In the prospective analysis, the overall estimates for sensitivity and specificity of the Abbott assay were both 100 % among smear-positive specimens, whereas the smear-negative specimens were 96.7 and 96.1 %, respectively. No cross-reactivity with non-tuberculosis mycobacterial species was observed. The superiority in sensitivity of the Abbott assay for detecting MTBC in smear-negative specimens could further minimize the risk in MTBC false-negative detection. The new Abbott RealTime MTB assay has good diagnostic performance which can be a useful diagnostic tool for rapid MTBC detection in clinical laboratories. © 2015, Springer-Verlag Berlin Heidelberg.postprin

A one-year trial of lamivudine for chronic hepatitis B

Background and Methods: In preliminary trials, lamivudine, an oral nucleoside analogue, has shown promise for the treatment of chronic hepatitis B. We conducted a one-year double-blind trial of lamivudine in 358 Chinese patients with chronic hepatitis B. The patients were randomly assigned to receive 25 mg of lamivudine (142 patients), 100 mg of lamivudine (143), or placebo (73) orally once daily. The patients underwent liver biopsies before entering the study and after completing the assigned treatment regimen. The primary end point was a reduction of at least two points in the Knodell necroinflammatory score. Results: Hepatic necroinflammatory activity improved by two points or more in 56 percent of the patients receiving 100 mg of lamivudine, 49 percent of those receiving 25 mg of lamivudine, and 25 percent of those receiving placebo (P<0.001 and P=0.001, respectively, for the comparisons of lamivudine treatment with placebo). Necroinflammatory activity worsened in 7 percent of the patients receiving 100 mg of lamivudine, 8 percent of those receiving 25 mg, and 26 percent of those receiving placebo. The 100mg dose of lamivudine was associated with a reduced progression of fibrosis (P=0.01 for the comparison with placebo) and with the highest rate of hepatitis B e antigen (HBeAg) seroconversion (loss of HBeAg, development of antibody to HBeAg, and undetectable HBV DNA) (16 percent), the greatest suppression of HBV DNA (98 percent reduction at week 52 as compared with the base-line value), and the highest rate of sustained normalization of alanine aminotransferase levels (72 percent). Ninety-six percent of the patients completed the study. The incidence of adverse events was similar in all groups, and there were few serious events. Conclusions: In a one-year study, lamivudine was associated with substantial histologic improvement in many patients with chronic hepatitis B. A daily dose of 100 mg was more effective than a daily dose of 25 mg.published_or_final_versio

Experimental Measurement of the Berry Curvature from Anomalous Transport

Geometrical properties of energy bands underlie fascinating phenomena in a wide-range of systems, including solid-state materials, ultracold gases and photonics. Most famously, local geometrical characteristics like the Berry curvature can be related to global topological invariants such as those classifying quantum Hall states or topological insulators. Regardless of the band topology, however, any non-zero Berry curvature can have important consequences, such as in the semi-classical evolution of a wave packet. Here, we experimentally demonstrate for the first time that wave packet dynamics can be used to directly map out the Berry curvature. To this end, we use optical pulses in two coupled fibre loops to study the discrete time-evolution of a wave packet in a 1D geometrical "charge" pump, where the Berry curvature leads to an anomalous displacement of the wave packet under pumping. This is both the first direct observation of Berry curvature effects in an optical system, and, more generally, the proof-of-principle demonstration that semi-classical dynamics can serve as a high-resolution tool for mapping out geometrical properties

Difference of clinical features in childhood Mycoplasma pneumoniae pneumonia

<p>Abstract</p> <p>Background</p> <p><it>M. pneumoniae </it>pneumonia (MP) has been reported in 10-40% of community-acquired pneumonia cases. We aimed to evaluate the difference of clinical features in children with MP, according to their age and chest radiographic patterns.</p> <p>Methods</p> <p>The diagnosis of MP was made by examinations at both admission and discharge and by two serologic tests: the indirect microparticle agglutinin assay (≥1:40) and the cold agglutinins titer (≥1:32). A total of 191 children with MP were grouped by age: ≤2 years of age (29 patients), 3-5 years of age (81 patients), and ≥6 years of age (81 patients). They were also grouped by pneumonia pattern: bronchopneumonia group (96 patients) and segmental/lobar pneumonia group (95 patients).</p> <p>Results</p> <p>Eighty-six patients (45%) were seroconverters, and the others showed increased antibody titers during hospitalization. Among the three age groups, the oldest children showed the longest duration of fever, highest C-reactive protein (CRP) values, and the most severe pneumonia pattern. The patients with segmental/lobar pneumonia were older and had longer fever duration and lower white blood cell (WBC) and lymphocyte counts, compared with those with bronchopneumonia. The patient group with the most severe pulmonary lesions had the most prolonged fever, highest CRP, highest rate of seroconverters, and lowest lymphocyte counts. Thrombocytosis was observed in 8% of patients at admission, but in 33% of patients at discharge.</p> <p>Conclusions</p> <p>In MP, older children had more prolonged fever and more severe pulmonary lesions. The severity of pulmonary lesions was associated with the absence of diagnostic IgM antibodies at presentation and lymphocyte count. Short-term paired IgM serologic test may be mandatory for early and definitive diagnosis of MP.</p

Acute hepatitis associated with Q fever in a man in Greece: a case report

Coxiella burnetii is the causative agent of Q fever. Q fever is a worldwide zoonosis that is responsible for various clinical manifestations. However, in Greece hepatitis due to Coxiella is rarely encountered. A case of Q fever associated with hepatitis is reported here. Diagnosis was made by specific serological investigation (enzyme-linked immunosorbent and indirect immunofluorescene assays) for Coxiella burnetii