D. Sengupta

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The space-time evolution of the ocean and atmosphere associated with 1998-2000 monsoon intraseasonal oscillations (ISO) in the Indian Ocean and west Pacific is studied using validated sea surface temperature (SST) and surface wind speed from the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager, and satellite outgoing longwave radiation. Monsoon(More)
It has been suggested that Parkinson's disease (PD) impairs the ability to learn on the basis of reward or reinforcing feedback i.e., by trial-and-error. In many learning tasks, particular 'dimensions' of stimulus information are relevant whilst others are irrelevant; therefore, efficient performance depends on identifying the dimensions of these 'compound'(More)
Observed upper ocean currents south of Sri Lanka exhibit large, irregular fluctuations with periods of days to weeks. An ocean model driven by daily surface winds is able to reproduce the observed fluctuations. We find from model experiments that low frequency (30-50 day) intraseasonal variability (ISV) arises when Rossby waves radiated from the eastern(More)
The National Institute of Oceanography, Goa deployed moorings with several subsurface current meters at 0 • , 93 • E (in February 2000) and 0 • , 83 • E (in December 2000) in the eastern Indian Ocean. Observed meridional current at all depths has a 10-20 day (or biweekly) variability that is distinct from longer period (20-60 day) subseasonal variability.(More)
[1] The zonal wind in the equatorial Indian Ocean (EqIO) is westerly almost throughout the year. It has a strong semiannual cycle and drives the spring and fall Wyrtki jets. In addition, high resolution daily satellite winds show ''westerly wind bursts'' lasting 10– 40 days, associated with atmospheric convection in the eastern EqIO. These bursts have the(More)
The bandwidth that minimizes the mean integrated square error of a kernel density estimator may not always be good when the density estimate is used for classification purpose. On the other hand cross-validation based techniques for choosing bandwidths may not be computationally feasible when there are many competing classes. Instead of concentrating on a(More)
In a cross-sectional observational study, time-to-event distribution can be estimated from data on current status or from recalled data on the time of occurrence. In either case, one can treat the data as having been interval censored, and use the nonparametric maximum likelihood estimator proposed by Turnbull (J R Stat Soc Ser B 38:290-295, 1976). However,(More)
In the matter of sampling of a continuous time stationary stochastic process for the purpose of spectrum estimation, a practical constraint that comes in the way is that of a minimum separation between successive samples. It is well known that for a given threshold of separation, uniform sampling can be used to estimate only those power spectral densities(More)
It is well known that in a firm real time system with a renewal arrival process , exponential service times and stochastic deadlines till the end of service of a job, the earliest deadline first (EDF) scheduling policy has smaller loss ratio (expected fraction of jobs that are not completed) than any other service time independent scheduling policy,(More)