SUPERFLIP is a computer program that can solve crystal structures from diffraction data using the recently developed charge-flipping algorithm. It can solve periodic structures, incommensurately modulated structures and quasicrystals from X-ray and neutron diffraction data. Structure solution from powder diffraction data is supported by combining the charge-flipping algorithm with a histogram-m...

.Fast Foulier Transform (FFT ) is an important tool required for signal processing in defence applications. Thi~ paper reports an improved method for generating bit reversed numbers needecj in calculating FFf using radix-2. The refined algorithm takes advantage of some features of the bit reversed numbers, using intermediate arra~ lor storage and improved procedure for calculating base values r...

An edge-flipping operation in a triangulation T of a set of points in the plane is a local restructuring that changes T into a triangulation that differs from T in exactly one edge. The edgeflipping distance between two triangulations of the same set of points is the minimum number of edge-flipping operations needed to convert one into the other. In the context of computing the rotation distanc...

We consider an open shop scheduling problem. At first, a bi-objective possibilistic mixed-integer programming formulation is developed. The inherent uncertainty in processing times and due dates as fuzzy parameters, machine-dependent setup times and removal times are the special features of this model. The considered bi-objectives are to minimize the weighted mean tardiness and weighted mean co...

This paper introducing a novel technique called as redundant binary booth algorithm. The redundant binary in the design of high-speed digital multipliers is beneficial due to its high modularity and carry-free addition. Generally, in a high radix modified Booth encoding algorithm the partial products are reduced in multiplication process. But it yields complexity in producing in generation of h...

The paper proposes an algorithm to calculate the switching angles using harmonic elimination PWM (HEPWM) scheme for voltage source inverter. The algorithm is based on curve fittings of a certain polynomials functions. The resulting equations require only the addition and multiplication processes; therefore, it can be implemented efficiently on a microprocessor. An extensive angle error analysis...

Error correction coding for optical communication and storage requires high rate codes that enable data throughput low residual errors. Recently, different concatenated schemes were proposed are based on binary BCH with error correcting capabilities. In this work, low-complexity hard- soft-input decoding methods such investigated. We propose three concepts to reduce the complexity of decoder. F...

finding frequent patterns plays a key role in exploring association patterns, correlation, and many other interesting relationships that are applicable in tdb. several association rule mining algorithms such as apriori, fp-growth, and eclat have been proposed in the literature. fp-growth algorithm construct a tree structure from transaction database and recursively traverse this tree to extract...

In this paper, we propose a modification to the existing Data Encryption Standard (DES) to make it secure and prone to the bit errors caused by the wireless channel. We observe that using the modified algorithm in wireless channels, improves the bit error rate (BER) performance as well as security compared to DES. Wireless channels are an open medium to intruders and their attacks; encryption i...