Akshay K. Kulkarni

Learn More
With advances in the computer technology and the World Wide Web there has been an explosion in the amount and complexity of multimedia data that are generated, stored, transmitted, analyzed, and accessed. In order to extract useful information from this huge amount of data, many content-based image retrieval (CBIR) systems have been developed in the last(More)
We performed 2D and full 3D magnetohydrodynamic simulations of disk accretion to a rotating star with an aligned or misaligned dipole magnetic field. We investigated the rotational equilibrium state and derived from simulations the ratio between two main frequencies: the spin frequency of the star and the orbital frequency at the inner radius of the disk.(More)
An Intrusion Detection System (IDS) acts as a network security tool and provides various approaches for detecting unauthorized activity, and have given us an insight into some of the problems which are yet to be solved. This paper proposes a Distributed Intrusion Detection System (DIDS) for private LAN’s by using Honeypots and Fault Tolerance mechanism. The(More)
Handwriting recognition is a process which translates handwritten documents into digital data that can be recognized by a computer. There are two general types of handwriting recognition: Offline recognition and online recognition. This paper proposes a new approach for offline handwriting recognition. In this approach we recognize handwritten characters(More)
The appearance and time variability of accreting millisecond X-ray pulsars (hereafter AMXPs, e.g. Wijnands & van der Klis 1998) depends strongly on the accretion rate, the effective viscosity and the effective magnetic diffusivity of the disk-magnetosphere boundary. The accretion rate is the main parameter which determines the location of the magnetospheric(More)
We present results of 3D simulations of MHD instabilities at the accretion diskmagnetosphere boundary. The instability is Rayleigh-Taylor, and develops for a fairly broad range of accretion rates and stellar rotation rates and magnetic fields. It produces tall, thin tongues of plasma that penetrate the magnetosphere in the equatorial plane. The shape and(More)
We present results of global 3D MHD simulations of disk accretion to a rotating star with dipole and more complex magnetic fields using a Godunovtype code based on the “cubed sphere” grid developed earlier in our group. We describe the code and the grid and show examples of simulation results.
We report the first global three-dimensional (3D) MHD simulations of disk accretion onto a rotating magnetized star through the Rayleigh-Taylor instability. In this regime, the accreting matter typically forms 2 to 7 vertically elongated “tongues” which penetrate deep into the magnetosphere, until they are stopped by the strong field. Subsequently, the(More)
  • 1