Precautionary Measures for Credit Risk Management in Jump Models

Sustaining efficiency and stability by properly controlling the equity to asset ratio is one of the most important and difficult challenges in bank management. Due to unexpected and abrupt decline of asset values, a bank must closely monitor its net worth as well as market conditions, and one of its important concerns is when to raise more capital so as not to violate capital adequacy requirements. In this paper, we model the tradeoff between avoiding costs of delay and premature capital raising, and solve the corresponding optimal stopping problem. In order to model defaults in a bank's loan/credit business portfolios, we represent its net worth by Levy processes, and solve explicitly for the double exponential jump diffusion process and for a general spectrally negative Levy process.Comment: 31 pages, 4 figure

Analysis of circadian rhythms from online communities of individuals with affective disorders

The circadian system regulates 24 hour rhythms in biological creatures. It impacts mood regulation. The disruptions of circadian rhythms cause destabilization in individuals with affective disorders, such as depression and bipolar disorders. Previous work has examined the role of the circadian system on effects of light interactions on mood-related systems, the effects of light manipulation on brain, the impact of chronic stress on rhythms. However, such studies have been conducted in small, preselected populations. The deluge of data is now changing the landscape of research practice. The unprecedented growth of social media data allows one to study individual behavior across large and diverse populations. In particular, individuals with affective disorders from online communities have not been examined rigorously. In this paper, we aim to use social media as a sensor to identify circadian patterns for individuals with affective disorders in online communities.We use a large scale study cohort of data collecting from online affective disorder communities. We analyze changes in hourly, daily, weekly and seasonal affect of these clinical groups in contrast with control groups of general communities. By comparing the behaviors between the clinical groups and the control groups, our findings show that individuals with affective disorders show a significant distinction in their circadian rhythms across the online activity. The results shed light on the potential of using social media for identifying diurnal individual variation in affective state, providing key indicators and risk factors for noninvasive wellbeing monitoring and prediction

Rupture Uterine Par Accident De La Voie Publique: A propos d’un cas.

Un cas de rupture utérine par accident de la voie publique associée à une fracture de l’humérus droit et du bassin est décrit. Les pronostics maternels et foetal sont discutés à la lumière de la revue de la littérature

Ultrafast trapping times in ion implanted InP

As⁺ and P⁺implantation was performed on semi-insulating (SI) and p-type InP samples for the purpose of creating a material suitable for ultrafast optoelectronic applications. SI InP samples were implanted with a dose of 1×10¹⁶ cm⁻² and p-type InP was implanted with doses between 1×10¹² and 1×10¹⁶ cm⁻². Subsequently, rapid thermal annealing at temperatures between 400 and 700 °C was performed for 30 sec. Hall-effect measurements, double-crystal x-ray diffraction, and time-resolved femtosecond differential reflectivity showed that, for the highest-annealing temperatures, the implanted SI InP samples exhibited high mobility, low resistivity, short response times, and minimal structural damage. Similar measurements on implantedp-type InP showed that the fast response time, high mobility, and good structural recovery could be retained while increasing the resistivity

Evaluation des connaissances paysannes sur la diversité de l'entomofaune du sorgho et de l'arachide au Burkina Faso

Une enquête a été menée, de juillet à décembre 1996, dans cinq provinces productrices du sorgho et de l'arachide au Burkina Faso, pour évaluer les connaissances paysannes sur la diversité des insectes nuisibles aux deux cultures et sur leurs ennemis naturels associés. L'enquête a touché 244 personnes de cinq ethnies les plus représentées du pays. Les résultats montrent que les paysans du Burkina Faso ont une connaissance assez détaillée de la plupart des arthropodes nuisibles majeurs du sorgho et de I'arachide. En revanche, ils identifient certains arthropodes prédateurs, mais ils méconnaissent leur utilité dans la lutte contre les ravageurs des cultures. Pour protéger leurs productions, ils privilégient une lutte chimique sans précautions, au risque de s'intoxiquer et de polluer leur environnement. Il est donc nécessaire de les aider à différencier insectes nuisibles et ennemis naturels dans leurs champs, et à préserver ces derniers. (Résumé d'auteur

Review on Newcastle disease in poultry

Newcastle disease is an infectious disease of poultry caused by an avian Paramyxovirus type I that affects more than two hundred avian species. It is an enzootic disease in parts of Asia, Africa, the Middle East and some countries in South America. Isolated outbreaks of Newcastle disease occur sporadically in some European countries and Central America. This review synthesizes available information on the virus and the disease it causes. The disease is transmitted by direct contact with infected animals or by indirect contact through inanimate carriers. The incubation period of the disease varied from 2 to 15 days. Five pathotypes were distinguished according to the incidence and severity of the clinical signs. Velogenic strains, which are the most virulent, can cause 100% mortality in unprotected herds. Control measures are based on mass vaccination of susceptible animals and the application of biosecurity measures in poultry farms. Regulations are also put in place to prevent the introduction of the virus into countries free of the disease.Keywords: Poultry, paramyxovirus, Newcastle disease, panzootie, mortality. &nbsp

Giant vortices, vortex rings and reentrant behavior in type-1.5 superconductors

We predict that in a bulk type-1.5 superconductor the competing magnetic responses of the two components of the order parameter can result in a vortex interaction that generates group-stabilized giant vortices and unusual vortex rings in the absence of any extrinsic pinning or confinement mechanism. We also find within the Ginzburg-Landau theory a rich phase diagram with successions of behaviors like type-1 -> type-1.5 -> type-2 -> type-1.5 as temperature decreases.Comment: 5 pages, 4 figure