209,008 research outputs found
Hedging and Coordinated Risk Management: Evidence from Thrift Conversions
No full textThe authors propose an approach to analyzing risk management activities when multiple risks are bundled within a firm's assets or liabilities. They classify potentially bundled risks into two types: compensated risk and hedgeable risk. Firms earn rents for bearing compensated risk such as credit risk, and earn zero economic rents for bearing hedgeable risk such as interest rate risk. Because the costs associated with reducing hedgeable risk are lower than those associated with compensated risk, firms rationally eliminate hedgeable risks using either on- or off-balance sheet strategies. Thus, hedging becomes desirable even for risk-neutral or risk-seeking firms as a means of allocating risk. They denote this approach of optimal risk allocation among multiple risks with a firm as Coordinated Risk Management. The authors test the coordinated risk management approach by examining the interaction between interest rate risk (hedgeable risk) and credit risk (compensated risk) management at thrift institutions following conversion form a mutual-to-stock form of ownership. Although the concept of coordinated risk management applies to any firm, they use this sample because of data availability for the sample of converting thrifts and the control groups of non-converting institutions. The time-series findings are consistent with the coordinated management of interest rate risk and credit risk. In particular, immediately at conversion they observe decreased interest rate risk across institutions combined with a more gradual trend toward increasing credit risk. The negative relation between interest rate risk and credit risk is also significant in pooled tests. In addition, institutions use both on-balance sheet strategies and derivative instruments to reduce interest rate risk. This finding of decreasing interest rate risk occurs despite incentives to increase total risk following conversion. In light of the current discussions on the use of derivatives, this finding also indicates that thrifts use derivatives instruments for hedging rather than for speculative purposes. The cross-sectional results support models of optimal hedging. The authors provide evidence that interest rate risk hedging within an institution is positively associated with ex ante growth opportunities. They also provide evidence that managerial security holdings are a significant determinant of hedging activity. Finally, they report a negative association between managerial option holdings and interest rate risk hedging. Managers holding relatively high numbers of options maintain a risky position on-balance sheet with respect to unexpected changes in interest rates.
Trajectories with suppressed tensor-to-scalar ratio in Aligned Natural Inflation
No full textIn Aligned Natural Inflation, an alignment between different potential terms produces an inflaton excursion greater than the axion scales in the potential. We show that, starting from a general potential of two axions with two aligned potential terms, the effective theory for the resulting light direction is characterized by four parameters: an effective potential scale, an effective axion constant, and two extra parameters (related to ratios of the axion scales and the potential scales in the 2−field theory). For all choices of these extra parameters, the model can support inflation along valleys (in the 2−field space) that end in minima of the potential. This leads to a phenomenology similar to that of single field Natural Inflation. For a significant range of the extra two parameters, the model possesses also higher altitude inflationary trajectories passing through saddle points of the 2−field potential, and disconnected from any minimum. These plateaus end when the heavier direction becomes unstable, and therefore all of inflation takes place close to the saddle point, where—due to the higher altitude—the potential is flatter (smaller epsilon parameter). As a consequence, a tensor-to-scalar ratio r = O ( 10−4 − 10−2 ) can be easily achieved in the allowed ns region, well within the latest 1 σ CMB contours
Instituto de liderazgo público UNAL - ADEXUN : Una universidad para el liderazgo público
No full textilustraciones en blanco y negroLa creación del Instituto de Liderazgo Público de la Universidad
Nacional de Colombia (ilp unal - adexun) se encuentra arraigada en
la historia y los principios fundamentales de la Universidad Nacional
de Colombia (unal), así como en la misión de la Asociación de Exalumnos de la Universidad Nacional de Colombia (adexun). Ambas
instituciones comparten el compromiso de impulsar procesos democráticos y ciudadanos desde una perspectiva académica, centrándose en la gestión y transferencia de conocimiento para abordar las
problemáticas sociales colombianas.
Históricamente, la unal ha sido un referente en la formación de
ciudadanos integrales, agentes éticos de transformación cultural y
comprometidos con el país y el mundo. El liderazgo ha sido un elemento constitutivo de su adn institucional, cohesionando a la comunidad universitaria en su conjunto. La universidad ha buscado construir
una sociedad basada en el conocimiento, el diálogo constructivo y participativo y el intercambio transformador de saberes. Por otro lado,
la adexun, desde su fundación, ha tenido como misión integrar a los
egresados de la unal, promoviendo su liderazgo y posicionamiento a
nivel nacional e internacional. Además, ha estimulado el sentido de
pertenencia y solidaridad entre sus miembros, generando acciones
conjuntas para fortalecer la comunidad de exalumnos. (Texto tomado de la fuente)Primera edición, 2024Introducción
El ejercicio del liderazgo en la Universidad Nacional de Colombia
Una universidad para el liderazgo público
Convergencia por Colombia
Formación en liderazgo público
"Ecosistema de liderazgo público" de la Universidad Nacional de Colombia
Acciones de liderazgo de la Universidad Nacionald e Colombia
Conclusiones
Referencia
Successful treatment with gemtuzumab ozogamicin monotherapy in a pediatric patient with resistant relapse of acute myeloid leukemia
No full textUnal S, Cakir M, Kuskonmaz B, Cetin M, Tuncer AM. Successful treatment with gemtuzumab ozogamicin monotherapy in a pediatric patient with resistant relapse of acute myeloid leukemia. Turk J Pediatr 2009; 51: 69-71
A rare metabolic complication of acute lymphoblastic leukemia in childhood: lactic acidosis
No full textGokce M, Unal S, Gulsen H, Basaran O, Cetin M, Gumruk F, Besbas N, Gurgey A. A rare metabolic complication of acute lymphoblastic leukemia in childhood: lactic acidosis. Turk J Pediatr 2012; 54: 61-63
A Multi-phase Research on Developing Proposals for Teaching the Properties of Matter in Early Scientific Education: Focusing on Teacher Practices
No full textThis research project in the field of physics education consists of three phases: conceptual reconstruction of the topic, literature review on learning difficulties and teacher education; evaluation of primary and secondary school teachers’ teaching practices on the properties of matter and their roles in physics; and focus group interviews with nine teachers to deepen the results of previous studies. Findings from the interviews show that some teachers do not have sufficient knowledge about the properties of matter and their roles in physics. Teachers often focus on the phase or state of properties of matter, but they emphasize the need to clarify the nature and relationship between the fundamental properties of matter. Although they state that understanding the properties of matter forms the basis of science education, they cannot provide sufficient examples of how and in what way it should be taught. As a result, teachers need to improve their content knowledge about the properties of matter and be supported with active learning methods that support formal thinking
Teachers' Perspectives and Practices on Teaching the Properties of Matter
No full textThis study investigates the perspectives and practices of teachers regarding teaching the properties of matter in elementary and middle schools in Italy and Turkey. The study employed a quantitative research design, utilizing questionnaire to gather data from a sample of teachers. The findings indicate that there are differences in the subtopics and concepts that teachers prioritize when teaching about the properties of matter, as well as in the methods and techniques they use. The study also found that there was a significant difference in the perspectives of teachers based on the country they worked in, but no significant difference was observed in the practices of teachers based on the country and school they worked in. These findings suggest that the country in which a teacher works has a greater impact on their perspectives on teaching the properties of matter than the level of school they work in. Future research may explore additional factors or variables that could influence teachers' perspectives and practices on teaching the properties of matter in different countries
Gravitational waves at interferometer scales and primordial black holes in axion inflation
No full textWe study the prospects of detection at terrestrial and space interferometers, as well as at pulsar timing array experiments, of a stochastic gravitational wave background which can be produced in models of axion inflation. This potential signal, and the development of these experiments, open a new window on inflation on scales much smaller than those currently probed with Cosmic Microwave Background and Large Scale Structure measurements. The sourced signal generated in axion inflation is an ideal candidate for such searches, since it naturally grows at small scales, and it has specific properties (chirality and non-gaussianity) that can distinguish it from an astrophysical background. We study under which conditions such a signal can be produced at an observable level, without the simultaneous overproduction of scalar perturbations in excess of what is allowed by the primordial black hole limits. We also explore the possibility that scalar perturbations generated in a modified version of this model may provide a distribution of primordial black holes compatible with the current bounds, that can act as a seeds of the present black holes in the universe
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Nonlinear perturbations from axion-gauge fields dynamics during inflation
No full textWe study a variant of the Chromo-Natural Inflation (CNI) mechanism in which the inflaton interacts only gravitationally with the CNI fields. Integrating out all the non- dynamical scalar fields of the model results in a coupling between the perturbations of the inflaton and of the CNI pseudo-scalar which is significantly greater than the one obtained in the absence of the gauge CNI dynamics. We compute how this greater coupling impacts the power spectrum of the inflaton perturbations that are sourced nonlinearly by the unstable (tensor) gauge CNI modes, and we require that the amplitude of these modes is well below that of the linear perturbations. Combining this result with various constraints, including backreaction effects, the requirement of having observable and dominant sourced gravita- tional waves (GW), and the current upper bound on the tensor-to-scalar ratio, significantly constrains the range of parameter space where this model can produce an interesting GW signal
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