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A Beginner’s Guide to Modern Monetary Theory
Peter Coy,Katia Dmitrieva,Matthew Boesler (사)참누리 빈곤문제연구소 2019 빈곤없는세상 컬럼 Vol.2019 No.-
최근 미국에서 핫이슈인 현대통화이론에 대하여 안내한다. 꼭 일독하시기 바란다. 우리나라에도 고용보장과 현대통화이론이 쟁점화될 것이다.
Jeffrey M.Coy 사람과세계경영학회 2012 Global Business and Finance Review Vol.17 No.1
Most cross-border transactions by U.S. firms occur when the target’s market is in a period of high valuation. In this study, I show that timing of cross-border acquisitions by U.S. firms can have a positive impact on announcement returns and on two-year buy-and-hold returns if the acquisition occurs during a period of low market valuation in the target’s country. During such periods, abnormal announcement returns and the two-year buy-and-hold abnormal returns are significantly higher than when the acquisition is made during periods of high target market valuation. The implication is that if a short difference in acquisition timing—a month or less— can have a significant impact on the value of the firm, then timing should always be given serious consideration.
Adriana Cuenca,Aura Coy,Natalia Gutiérrez,María Paula Santos,Juan David Bustos,Ana María Morales,Alejandra Marín 대한소아응급의학회 2023 대한소아응급의학회지 Vol.10 No.1
Purpose: During the coronavirus disease 2019 pandemic, Colombian government declared a lockdown, forcing children to stay at home. The authors aimed to analyze the change in the pattern of trauma-related visits during the lockdown. Methods: We carried out a retrospective descriptive study on injured children aged 17 years or younger who visited the emergency department of a tertiary pediatric hospital in Bogotá, Colombia from March 15 through May 15, 2019 (control period) and the same period in 2020 (lockdown period). Between the 2 periods, baseline characteristics and injury profiles were compared. Results: Among the study population (n = 1,485), 1,122 and 363 children visited the emergency department during the control and lockdown periods, respectively. In the midst of 73.9% decrease in numbers of overall visits between the 2 periods, a 67.6% decrease was noted in number of trauma-related visits. Regarding the proportions, trauma-related visits increased from 7.9% to 9.8%. During the lockdown, increases occurred in the proportions of the following variables: children younger than 5 years (25.5% to 50.7%; P < 0.001), mechanisms other than blunt, minor fall or traffic accident (e.g., bite, 3.9% to 6.6%; P = 0.032), child abuse (1.2% to 4.1%; P = 0.003), hospitalization (4.6% to 35.8%; P < 0.001), open wound (21.1% to 36.9%; P < 0.001), the use of computed tomography (6.3% to 9.9%; P < 0.001), and abnormal imaging findings (28.8% to 31.7%; P = 0.003). Conclusion: During the lockdown, children with trauma may show an increase in overall severity, and also a higher risk of abusive trauma. This finding indicates a sensible need of educating families in prevention of domestic injury.
Weber, Matthieu,Kim, Jae-Hun,Lee, Jae-Hyoung,Kim, Jin-Young,Iatsunskyi, Igor,Coy, Emerson,Drobek, Martin,Julbe, Anne,Bechelany, Mikhael,Kim, Sang Sub American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.40
<P>Herein, we report the fabrication of hydrogen gas sensors with enhanced sensitivity and excellent selectivity. The sensor device is based on the strategic combination of ZnO nanowires (NWs) decorated with palladium nanoparticles (Pd NPs) and a molecular sieve metal-organic framework (MOF) nanomembrane (ZIF-8). The Pd NPs permit the sensors to reach maximal signal responses, whereas the ZIF-8 overcoat enables for an excellent selectivity. Three steps were employed for the fabrication: (i) coating of a miniaturized sensor with vapor-grown ZnO NWs, (ii) decoration of these NWs with Pd NPs by atomic layer deposition, and (iii) partial solvothermal conversion of the tuned NWs surface to ZIF-8 nanomembrane. The microstructure and composition investigations of the ZIF-8/Pd/ZnO nanostructured materials confirmed the presence of both metallic Pd NPs and uniform ZIF-8 thin membrane layer. The integration of these nanomaterials within a miniaturized sensor device enabled the assessment of their performance for H<SUB>2</SUB> detection at concentrations as low as 10 ppm in the presence of various gases such as C<SUB>6</SUB>H<SUB>6</SUB>, C<SUB>7</SUB>H<SUB>8</SUB>, C<SUB>2</SUB>H<SUB>5</SUB>OH, and CH<SUB>3</SUB>COCH<SUB>3</SUB>. Remarkably high-response signals of 3.2, 4.7, and 6.7 (<I>R</I><SUB>a</SUB>/<I>R</I><SUB>g</SUB>) have been measured for H<SUB>2</SUB> detection at only 10, 30, and 50 ppm, whereas no noticeable response toward other tested gases was detected, thus confirming the excellent H<SUB>2</SUB> selectivity obtained with such a sensor design. The results obtained showed that the performance of gas sensors toward H<SUB>2</SUB> gas can be greatly increased by both the addition of Pd NPs and the use of ZIF-8 coating, acting as a molecular sieve membrane. Furthermore, the presented strategy could be extended toward the sensing of other species by a judicious choice of both the metallic NPs and MOF materials with tuned properties for specific molecule detection, thus opening a new avenue for the preparation of highly selective sensing devices.</P> [FIG OMISSION]</BR>