Remote sensing (RS) and Geographic Information Systems (GIS) techniques have become very important these days as they aid planners and decision makers to make effective and correct decisions and designs. Principal Component Analysis (PCA) involves a mathematical procedure that transforms a number of (possibly) correlated variables into a (smaller) number of uncorrelated variables. It reduces the dimensionality of the data set and identifies a new meaningful underlying variable. Morphometric analysis and prioritization of the subwatersheds of Shakkar River Catchment, Narsinghpur district in Madhya Pradesh State, India, is carried out using RS and GIS techniques as discussed in Gajbhiye et al. (Appl Water Sci 4(1):51-61, 2013b). In this study we apply PCA technique in Shakkar River Catchment for redundancy of morphometric parameters and find the more effective parameters for prioritization of the watershed and discuss the comparison between Gajbhiye et al. (Appl Water Sci 4(1):51-61, 2013b) and the present prioritization scheme.
Wireless sensor network (WSN) is a network system that involves spatially distributed devices such as wireless sensor nodes. As the data collected by the sensor nodes and transmitted through WSNs are mostly sensitive, confidential, or personal data, secure information transmission is a critical challenge, and one of the most significant security requirements is authentication. The digital signature plays a key role in ensuring data integrity, authentication and non-repudiation. In this article, we shall present an efficient, high security level online/offline subtree-based short signature scheme (OOS-SSS) using Chebyshev chaotic maps for WSN fuzzy user data sharing over a Galois field. The proposed scheme is secure in an environment of random oracle unforgeability under chosen message attack (UF-SBSS-CMA). Notably, our new design has made multiple-time usage of offline storage possible, enabling the signer to reuse offline pre-info in polynomial time instead of having only one single attempt as in the currently available online/offline signing schemes. In addition, based on our OOS-SSS design, we can build up an aggregation scheme for wireless sensor network settings. Also, the proposed scheme can be extended with some applications attached to it to allow users to register messages and implement them on WSN. Lastly, our performance comparison reveals that the proposed scheme has the lowest computational cost among six competing schemes. INDEX TERMS Chebyshev chaotic maps, wireless sensor networks systems, subtree, short signature scheme, Random oracle.
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