Essentially, there are two notions of volatility in literature: historical volatility and implied volatility. While measures of the former notion are derived from historical returns by (weighted) averaging over a time window, measures of the latter are estimated from observed option prices. Whatever particular volatility measure one is willing to apply, a central question is that of predictabil...

Gossiping is an important problem in Radio Networks that has been well studied, leading to many important results. However, due to the strong resource limitations of sensor nodes, previous solutions are frequently not feasible in Sensor Networks. In this paper, we study the gossiping problem in the restrictive context of Sensor Networks. By exploiting the geometry of sensor node distributions, ...

Given a set P of N points in a ddimensional space, along with a query point q, it is often desirable to find k points of P that are with high probability close to q. This is the Approximate k-NearestNeighbors problem. We present two algorithms for AkNN. Both require O(Nd) preprocessing time. The first algorithm has a query time cost that is O(d+logN), while the second has a query time cost that...

background: trauma is a major healthcare challenge worldwide. in developing countries, most road deaths happen during the pre-hospital phase; consequently, pre-hospital trauma care has received considerable attention during the past decades. objectives: the aim of this study was to investigate the quality of pre-hospital oxygen therapy in patients with multiple trauma. patients and methods: thi...

background: pre-eclampsia, a vascular disorder of pregnancy, is a leading cause of maternal morbidity as well as perinatal morbidity and mortality. the cause of pre-eclampsia remains largely unknown. accumulating evidences from clinical and epidemiological studies suggest that diffuse endothelial dysfunction, resulting from oxidative stress, plays an important role in the pathogenesis of pre-ec...

objective: to examine association between maternal socio-cultural status, as indicated by maternal income, education and polygamy with severity of pre–eclampsia. materials and methods: this study was carried out in primary health centers in katsina, adamawa and borno states. a total of two groups of subjects were selected for the study, with 50 subjects in each group. group a - pregnant non hyp...