Variable order Markov chains have been used to model discrete sequential data in a variety of fields. A host of methods exist to estimate the history-dependent lengths of memory which characterize these models and to predict new sequences. In several applications, the data-generating mechanism is known to be reversible, but combining this information with the procedures mentioned is far from trivial. We introduce a Bayesian analysis for reversible dynamics, which takes into account uncertainty in the lengths of memory. The model proposed is applied to the analysis of molecular dynamics simulations and compared with several popular algorithms. [ABSTRACT FROM AUTHOR]
Murali, Meera, Pande, Vijay N., and Gopalakrishnan, Narayan
Electric Power Components & Systems. 2015, Vol. 43 Issue 11, p1215-1224. 10p.
MICROFABRICATION, ELECTRIC line design & construction, POWERLINE ampacity, FLEXIBLE AC transmission systems, and COMPUTER simulation
This article presents a procedure for the development of a scaled-down laboratory model of a transmission line based on per unit. values of a true line. TheX/Rratio of the model is kept same as that of the true line, as then only their performance can be compared. The current-carrying capacity of the scaled-down model is closer to 20 A to enhance its utility with different flexible AC transmission systems devices. A scaled-down model of a true line for which parameters are available in the open literature is fabricated, and a case study of its simulation and validation is presented. These studies show that the laboratory model is able to emulate closely the true line, and therefore, it can be fruitfully used for the dynamic study of the transmission line embedded with flexible AC transmission systems and hardware-in-loop simulation studies. [ABSTRACT FROM AUTHOR]
We present an implementation of parallel (K)-means clustering, called (Kps)-means, that achieves high performance with near-full occupancy compute kernels without imposing limits on the number of dimensions and data points permitted as input, thus combining flexibility with high degrees of parallelism and efficiency. As a key element to performance improvement, we introduce parallel sorting as data preprocessing and updating steps. Our final implementation for Nvidia GPUs achieves speedups of up to 200-fold over CPU reference code and of up to three orders of magnitude when compared with popular numerical software packages. [ABSTRACT FROM AUTHOR]
Peck, Charles, Hursey, Joshua, McCoy, Josh, and Pande, Vijay
Dr. Dobb's Journal: Software Tools for the Professional Programmer. Nov2005, Vol. 30 Issue 11, p39-41. 3p. 1 Diagram.
DISTRIBUTED computing, CLIENT/SERVER computing, COMPUTER science, SWITCHING power supplies, and COMPUTER interfaces
This article describes a framework for harnessing distributed, tightly coupled cluster and switched-mode power supply (SMP) resources for computational science research. To support the execution of scientific cores on a variety of cluster and SMP-based distributed computing resources, the framework contains the area of functionality which are capability discovery, load balancing, progress monitoring checkpointing/restarting and results processing. This functionality is supported by a four-part structure which are the assignment/data server, mother, nannies and children.
Bhosale, Vijay H., Thomas, M. Joy, and Pande, D. C.
IEEE Transactions on Electromagnetic Compatibility. Aug2016 Part 2, Vol. 58 Issue 4, p1282-1288. 7p.
PULSED power systems, ULTRA-wideband devices, ELECTROMAGNETISM, ATMOSPHERIC pressure, BREAKDOWN voltage, and SULFUR hexafluoride
The ultrawideband (UWB) system has been a subject of research in the last few decades due to its utility in various high-power electromagnetic applications. Effectiveness of the UWB system, for the targeted performance, is expressed mainly in terms of the intensity and the frequency spectrum of the radiated field. If the system is simultaneously meant for high-energy output with good pulse repetition rate and jitter then the performance of the source of the UWB system, i.e., the pulsed power system, and in particular, the switch becomes extremely important. This paper presents the work carried out on such a UWB system with focus on the experimental investigations performed on a 50 kV pulsed power system. The switch of the pulsed power system is designed to use various dielectric gases, such as dry Air, N 2, SF6, and a mixture of these gases as the switching media at varying pressures which are above and below atmospheric pressure levels. For gas pressures above the atmospheric pressure level, the relationship between the switch breakdown voltage and the gas pressure as well as between the rise time and the gas pressure have been studied. Rise time performances of the switch for various pure gaseous media have been estimated. Jitter and shot life performance of the switch for N2 and SF6 as the switching media have also been studied. Effect of shot life on the switch jitter has been evaluated for N2 filled switch for a shot life of 10.8 × 106 shots. In case of switch filled with subatmospheric pressure SF6 gas, the rise time as a function of pressure has been characterized up to a voltage level of 45 kV. The Paschen's curve for the subatmospheric pressure levels is also derived from the results. [ABSTRACT FROM AUTHOR]