Informatics Publishing Limited

K. Hari Kishore ¹, Fazal Noorbasha ², Habibulla Khan ³, Asiya Begum ¹, Y. Rajasekhar Reddy , K. Anil Kumar

Affiliations
1 Department of ECE, KL University, Vijayawada, A.P, IN
2 Department of Electronics and Communication Engineering, KL University, Guntur, Andhra Pradesh, IN
3 Department of Electronics & Communication Engineering, KL University, Vijayawada, AP, IN

Abstract

Any VLSI circuit is composed of the very basic unit that is the multiplier. As technology is increasing day by day many new designs are being evolved. As the design becomes bigger more will be the delay in it. If the delay in the basic unit that is multiplier can be decreased then the overall delay in the new designs can be effectively alleviated. There are many multipliers designed so far in the field of VLSI using different methods for its implementation. This paper presents implementation of a Modified Booth multiplier. So far many Modified Booth multipliers are implemented. In all the methods for generating the partial products 'negi' the extra partial product bit is used due to which number of partial products generated will be N/2+1. If this 'negi' bit in the partial products can be avoided and efficient way for generating 2's complement of negative partial product is used which generates conversion signals, and then the number of partial products will decrease to N/2. For addition of partial products the design uses the 4:2 compressors to reduce the complexity in the circuit involved.

Keywords

Modified Booth Multiplier, Partial Product, Conversion Signal, 4:2 Compressors.

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C. M. Bhatt ¹, G. Srinivasa Rao ¹, Asiya Begum ¹, P. Manjusree ¹, S. V. S. P. Sharma ¹, L. Prasanna ¹, V. Bhanumurthy ¹

Affiliations
1 RS Applications Area, Disaster Management Support Division, National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 037, IN

Abstract

Satellite images provide information on the flood disaster footprints, which is essential for assessing the disaster impact and taking up flood mitigation activities. The Brahmaputra floods that occurred during June-July 2012 devastated a large part of Assam. This article discusses the maximum spatial extent affected due to the flood event, villages marooned and population affected, with the aid of multi-temporal satellite images coupled with the hydrological observations and freely available gridded population data. The study shows that about 4.65 lakh ha area was submerged, 23 of the 27 districts in Assam had more than 5% of the total geographical area submerged, about 3829 villages marooned and 23.08 lakh people were affected. Identification of the spatial extent of areas most vulnerable to flooding, captured from the satellite images acquired during the peak flood period will be helpful for prioritizing appropriate flood control measures in the flood-affected regions.

Keywords

Disaster Footprints, Floods, GIS, Inundation, Population, Remote Sensing.

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