Journal of Advances in Mathematics and Computer Science http://journaljamcs.com/index.php/JAMCS <p style="text-align: justify;"><strong>Journal of Advances in Mathematics and Computer Science (ISSN:&nbsp;2456-9968) </strong>aims to publish original research articles, review articles and short communications, in all areas of mathematics and computer science. Subject matters cover pure and applied mathematics, mathematical foundations, statistics and game theory, use of mathematics in natural science, engineering, medicine, and the social sciences, theoretical computer science, algorithms and data structures, computer elements and system architecture, programming languages and compilers, concurrent, parallel and distributed systems, telecommunication and networking, software engineering, computer graphics, scientific computing, database management, computational science, artificial Intelligence, human-computer interactions, etc. This is a quality controlled, OPEN peer reviewed, open access INTERNATIONAL journal.</p> en-US contact@journaljamcs.com (Journal of Advances in Mathematics and Computer Science) contact@journaljamcs.com (Journal of Advances in Mathematics and Computer Science) Sat, 12 Oct 2019 00:00:00 +0000 OJS 3.1.1.4 http://blogs.law.harvard.edu/tech/rss 60 From Two to One Index Isomorphism in Optimization Program for Quarterly Disaggregation of Annual Times Series http://journaljamcs.com/index.php/JAMCS/article/view/30199 <p>The quarterly disaggregation of an annual economic aggregate, by a mathematical method with a cyclical indicator, gives rise to a problem of minimization to make the quarterly economic aggregate smooth. This involves two indexes for the quarter and the year, which sometimes can make the resolution algorithm less efficient if the problem is large. In this paper we propose a method of indexing quarterly variables based on an isomorphic transformation of a two-index program into a one-index program, in order to minimize the cost of the algorithm of resolution. This method of continuous indexing of variables, applied to national accounts, shows that the algorithm with a single index is more efficient than the algorithm with two indexes when solving the optimization program of the quarterly disaggregation.</p> Raïmi Aboudou Essessinou, Guy Degla, Babacar Mbaye Ndiaye ##submission.copyrightStatement## http://journaljamcs.com/index.php/JAMCS/article/view/30199 Sat, 12 Oct 2019 00:00:00 +0000 On Quasi-Hemi-Slant Riemannian Submersion http://journaljamcs.com/index.php/JAMCS/article/view/30200 <p>We recall the notions of invariant, anti-invarian, semi-invariant, slant, semi-slant, quasi-slant and hemi-slant Riemannian submersions from almost Hermitian manifolds to a Riemannian manifolds. In this paper we contruct a Riemannian submersion which generalizes hemi-slant, semi-slant and semi-invariant Riemanian submersions from almost Hermitian manifold to a Riemannian manifold and study its geometry.</p> S. Longwap, F. Massamba, N. E. Homti ##submission.copyrightStatement## http://journaljamcs.com/index.php/JAMCS/article/view/30200 Sat, 19 Oct 2019 00:00:00 +0000 Secure Electronic Voting Using a Hybrid Cryptosystem and Steganography http://journaljamcs.com/index.php/JAMCS/article/view/30201 <p>Conventional voting techniques have been employed over the years in most elections. However, each of these techniques has attendant short comings. The existing conventional voting systems have been subjected to gross abuse and irregularities. Electronic voting (e-voting) which is emerging as an alternative to these conventional voting systems, though highly promising, is not also totally free of flaws; information security issues bordering on privacy, integrity and verifiability of the electronic ballots casted are still significant in most implementations of e-voting systems. In this paper, we developed a security scheme that was based on a hybrid Rivest-Sharma-Adleman (RSA) algorithm and Advance Encryption Standard (AES) algorithm with <em>Least Significant Bit</em> (LSB) replacement algorithm for securing ballot information in an e-voting system. An e-voting system with multiple voting channels which includes poll site voting, mobile voting and remote internet voting was developed in the contextual Nigerian scenario. The electronic ballots casted via the system during experimental usage were encrypted using the hybrid RSA-AES algorithm to circumvent the problems of privacy, integrity and verifiability associated with many e-voting systems. The encrypted ballots were then hidden using LSB replacement algorithm to improve their integrity. The image quality of the cover image used and stego image obtained from the security scheme developed was quantitatively assessed using Peak Signal to Noise Ratio (PSNR), Mean Square Error (MSE) and Correlation. Furthermore, a performance evaluation based on users' perception of the developed e-voting system showed that the system satisfied most of the generic security requirements for electronic voting.</p> Oladotun O. Okediran, Adeyemi A. Sijuade, Wajeed B. Wahab ##submission.copyrightStatement## http://journaljamcs.com/index.php/JAMCS/article/view/30201 Sat, 19 Oct 2019 00:00:00 +0000