University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 \$4\$-total mean cordial labeling in subdivision graphs 1 11 78640 EN R Ponraj Department of Mathematics Sri Parakalyani College Alwarkurichi -627 412, India S SUBBULAKSHMI Sri Paramakalyani College Alwarkurichi-627412, Tamilnadu, India S Somasundaram Department of Mathematics Manonmaniam sundarnar university, Abishekapatti, Tirunelveli-627012, Tamilnadu, India Journal Article 2020 11 21 Let \$G\$ be a graph. Let \$f:Vleft(Gright)rightarrow left{0,1,2,ldots,k-1right}\$ be a function where \$kin mathbb{N}\$ and \$k>1\$. For each edge \$uv\$, assign the label \$fleft(uvright)=leftlceil frac{fleft(uright)+fleft(vright)}{2}rightrceil\$.  \$f\$ is called \$k\$-total mean cordial labeling of \$G\$ if \$left|t_{mf}left(iright)-t_{mf}left(jright) right| leq 1\$, for all \$i,jinleft{0,1,2,ldots,k-1right}\$, where \$t_{mf}left(xright)\$ denotes the total number of vertices and edges labelled with \$x\$, \$xinleft{0,1,2,ldots,k-1right}\$.  A graph with admit a \$k\$-total mean cordial labeling is called \$k\$-total mean cordial graph. https://jac.ut.ac.ir/article_78640_417b0db101ba534580bcc1065d70cdd3.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Linear optimization constrained by fuzzy inequalities defined by Max-Min averaging operator 13 28 79080 EN A. Ghodousian University of Tehran, College of Engineering, Faculty of Engineering Science 0000-0002-9224-8470 Sara Falahatkar University of Tehran, College of Engineering, Faculty of Engineering Science Journal Article 2020 12 20 In this paper, optimization of a linear objective function with fuzzy relational inequality constraints is investigated whereby the feasible region is formed as the intersection of two inequality fuzzy systems and textquotedblleft Fuzzy Max-Mintextquotedblright averaging operator is considered as fuzzy composition. It is shown that a lower bound is always attainable for the optimal objective value. Also, it is proved that the optimal solution of the problem is always resulted from the unique maximum solution and a minimal solution of the feasible region. An algorithm is presented to solve the problem and an example is described to illustrate the algorithm. https://jac.ut.ac.ir/article_79080_dbd6cabd14838434f023bf778552f3e4.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Crypto- Currency Price Prediction with Decision Tree Based Regressions Approach 29 40 79110 EN Ali Naghib Moayed Department of Statistics, Allameh Tabatabyee University Reza Habibi Iran Banking Institute, Central Bank of Iran Journal Article 2020 12 22 Generally, no one can reject the fact that crypto currency market is expanded rapidly during last few years as, nowadays, crypto currency market is attractive for both traders and business who are not willing to pay for FATF services for transferring money. With this in mind, crypto currency price prediction is crucial for many people and business entities. While there have been quite a few conventional statistical models to forecast crypto currency prices, we decided to make price prediction using decision Tree Based Regression. In this research we devised a decision tree models to predict Bitcoin which is the most renowned and frequently used crypto currency. we used Volume from, Volume to, New addresses, Active addresses, large transaction count, Block height, Hash rate, Difficulty, Current supply as predictor variables in addition to historical crypto currency price data during the with a total of 1000 Observations. We find that forecasting accuracy of decision tree models are higher than benchmark models such as linear regression and autoregressive integrated moving average(ARIMA). https://jac.ut.ac.ir/article_79110_6156628d39397c2b78824976d69d9b12.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Implementation of Combinational Logic Circuits Using Nearest-Neighbor One-Dimensional Four-State Cellular Automata 41 56 79225 EN Abolfazl Javan University of Tehran, College of Engineering, Faculty of Engineerng Science, Department of Algorithms and Computation Maryam Jafarpour Department of Algorithms and Computation, College of Engineering, University of Tehran Tehran, 1417613131, Iran 0000-0001-7266-5018 Ali Moieni University of Tehran, College of Engineering, Faculty of Engineerng Science, Department of Algorithms and Computation Mohammad Shekaramiz Department of Electrical and Computer Engineering, Utah State University Logan, UT 84322-4120, USA Journal Article 2020 12 28 Cellular automata are simple mathematical idealizations of natural systems. They consist of a lattice of discrete identical sites, each site taking on a finite set of, say, integer values. Over the years, scientists have been trying to investigate the computational capabilities of cellular automata by limiting the dimension, neighborhood radius, and the number of states.<br />In this article, we represent a novel implementation of combinational logic circuits using nearest-neighbor one-dimensional four-state cellular automata (CA). The novelty behind the proposed model is the reduction of the required number of states and yet being able to implement combinational logic-circuits in the conventional CA fashion. This can open a new window to the computation using cellular automata. https://jac.ut.ac.ir/article_79225_bb5fb4256d7b683d0530681b354a0cb1.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 On the domination number of generalized Petersen graphs 57 65 79236 EN Abolfazl Poureidi Department of Mathematics, Shahrood University of Technology Shahrood, Iran Journal Article 2020 12 28 Let \$n\$ and \$k\$ be integers such that \$3leq 2k+ 1 leq n\$.<br />The generalized Petersen graph \$GP(n, k)=(V,E) \$ is the graph with <br />\$V={u_1, u_2,ldots, u_n}cup{v_1, v_2,ldots, v_n}\$ and \$E={u_iu_{i+1}, u_iv_i, v_iv_{i+k}: 1 leq i leq n}\$, where<br />addition is in modulo \$n\$. A subset \$Dsubseteq V\$ is a dominating set of \$GP(n, k)\$ if for each \$vin Vsetminus D\$ there is a vertex \$uin D\$ adjacent to \$v\$. The minimum cardinality of a dominating set of \$GP(n, k)\$ is called the domination number of \$GP(n, k)\$. In this paper we give a dynamic programming algorithm for computing the domination number of a given \$GP(n,k )\$ in \$mathcal{O}(n)\$ time and space for every \$k=mathcal{O}(1)\$. https://jac.ut.ac.ir/article_79236_83169ff58aaf301dce65ecd29d8d6030.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 On Hardy's Apology Numbers 67 83 79248 EN Dr. Henk Koppelaar Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, Delft, The NetherlandsVredenburchstede 20 0000-0001-7487-6564 Peyman Nasehpour Department of Engineering Science \\ Golpayegan University of Technology Journal Article 2020 12 29 Twelve well known `Recreational' numbers are generalized and classified in three generalized types Hardy, Dudeney, and Wells. A novel proof method to limit the search for the numbers is exemplified for each of the types. Combinatorial operators are defined to ease programming the search. https://jac.ut.ac.ir/article_79248_56d3c030088a170a3906b627fcde5388.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 LP Problems on the max - “Fuzzy Or” inequalities systems 85 98 79249 EN A. Ghodousian University of Tehran, College of Engineering, Faculty of Engineering Science 0000-0002-9224-8470 Parmida Mirhashemi University of Tehran, College of Engineering, Faculty of Engineering Science, 0000-0001-6326-0449 Journal Article 2020 12 29 In this paper, optimization of a linear objective function with fuzzy relational inequality constraints is investigated whereby the feasible region is formed as the intersection of two inequality fuzzy systems and “Fuzzy Or” operator is considered as fuzzy composition. It is shown that a lower bound is always attainable for the optimal objective value. Also, it is proved that the optimal solution of the problem is always resulted from the unique maximum solution and a minimal solution of the feasible region. An algorithm is presented to solve the problem and an example is described to illustrate the algorithm. https://jac.ut.ac.ir/article_79249_c198efc6bb40dcd88841addc34b6ec2c.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Generalization of DP Curves and Surfaces 99 108 79264 EN Davood Bakhshesh Department of Computer Science, University of Bojnord, Bojnord, Iran. Journal Article 2020 12 31 In CAGD, the DP curves   are known  as a  normalized totally positive curves that have the linear computational complexity. Because of their geometric properties, these curves will have the shape preserving properties, that is, the form of the curve will maintain the shape of the polygon and optimal stability.  In this paper, we first define a new basis functions that are called generalized DP basis functions. Based on these functions,  the generalized DP curves and surfaced are defined which have most properties of the classical DP curves and surfaces. These curves and surfaces have geometric properties  as the rational DP curves and surfaces. Furthermore, we show that the shape parameters can control the shape of the proposed curve without changing the control points.  https://jac.ut.ac.ir/article_79264_7b24762116d5b5830b5d4ad475da353f.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 On the optimization of Hadoop MapReduce default job scheduling through dynamic job prioritization 109 126 79266 EN Narges Peyravi Department of Computer Engineering and Information Technology, Faculty of Engineering, University of Qom, Qom, Iran Ali Moeini Department of Algorithms and Computation, School of Engineering Science, College of Engineering, University of Tehran Journal Article 2020 12 31 One of the most popular frameworks for big data processing is Apache Hadoop MapReduce. The default Hadoop scheduler uses queue system. However, it does not consider any specific priority for the jobs required for MapReduce programming model. In this paper, a new dynamic score is developed to improve the performance of the default Hadoop MapReduce scheduler. This dynamic priority score is computed based on effective factors such as job runtime estimation, input data size, waiting time, and length or bustle of the waiting queue. The implementation of the proposed scheduling method, based on this dynamic score, not only improves CPU and memory performance, but also reduced waiting time and average turnaround time by approximately \$45%\$ and \$40%\$ respectively, compared to the default Hadoop scheduler. https://jac.ut.ac.ir/article_79266_1ccbac12d443ad1cb51ac9305190b1b3.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Fuzzy Cumulative Distribution Function and its Properties 127 136 79267 EN Mehdi Shams Department of Mathematical Sciences, University of Kashan, Isfahan, Iran. Gholamreza Hesamian Department of Statistics, Payame Noor University, Tehran 19395-3697, Iran Journal Article 2020 12 31 The statistical methods based on cumulative distribution function is a start point for  many parametric or nonparametric statistical inferences. However, there are many practical problems that require dealing with observations/parameters that represent inherently imprecise.  However, Hesamian and Taheri (2013) was extended a concept of fuzzy cumulative distribution function. Applying a common notion of fuzzy random variables, they extended a vague concept of  fuzzy cumulative distribution function. However, the main properties of the proposed method has not yet been considered in fuzzy environment.  This paper aims to extend  the classical properties of the fuzzy cumulative distribution function in fuzzy environment. https://jac.ut.ac.ir/article_79267_82f43625d638278d11153074cd36964c.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 Two different inverse eigenvalue problems for nonsymmetric tridiagonal matrices 137 148 79269 EN Ferya Fathi Department of Mathematics, Central Tehran Branch, Islamic Azad University, Tehran, Iran Mohammad Ali Fariborzi Araghi Department of Mathematics, Faculty of Sciences, Central Tehran branch, Islamic Azad university, Tehran, Iran. 0000-0002-5467-9296 Seyed Abolfazl Shahzadeh Fazeli Department of Computer Science, Yazd University, Yazd, Iran. 0000-0002-3724-8689 Journal Article 2020 12 31 Inverse eigenvalue problems (IEPs) of tridiagonal matrices are among the most popular IEPs, this is due to the widespread application of this matrix. In this paper, two different IEPs with different eigen information including eigenvalues and eigenvectors are presented on the nonsymmetric tridiagonal matrix. A recursive relation of characteristic polynomials of the leading principal submatrices of the required matrix is presented to solve the problems. The application of the problems in graph and perturbation theory is studied. The necessary and sufficient conditions for solvability of the problems are obtained.<br />The algorithms and numerical examples are given to show the applicability of the proposed scheme. https://jac.ut.ac.ir/article_79269_ecc0d219b5c8c3f9e1df951b33d76cdb.pdf
University of Tehran Journal of Algorithms and Computation 2476-2776 52 2 2020 12 01 A note on the approximability of the tenacity of graphs 149 157 79270 EN Vahid Heidari University of Tehran, Department of Algorithms and Computation. Dara Moazzami University of Tehran, College of Engineering, Faculty of Engineering Science Journal Article 2021 01 01 In this paper we show that, if \$NPneq ZPP\$, for any \$epsilon > 0\$, the tenacity of graph<br />with \$n\$ vertices is not approximable in polynomial time within a factor of<br />\$frac{1}{2} left( frac{n-1}{2} right) ^{1-epsilon}\$. https://jac.ut.ac.ir/article_79270_0a4d1e9aa72c099beb4fcfe521d1bc23.pdf