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Journal of Mathematics UNP

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Published by Universitas Negeri Padang

ISSN : 23551658 EISSN : 28073460 DOI : http://dx.doi.org/10.24036/unpjomath.v7i3.12564

Core Subject : Science, Education,

Computer Science & IT Decision Sciences, Operations Research & Management Mathematics

Journal of Mathematics UNP is a journal to publish article from student researches in UNP Mathematics study program, and we also kindly accept other article from outside of our study program related to Mathematics: consists of publication in Algebra, Analysis, Combinatoric, Geometry, Differential Equations, Graph and/or Mixed Mathematics Applications: consists of publication in Application of Differential Equations, Mathematics Modelling, Mathematics Physics, Mathematics Biology, Financial Mathematics, Application of Graph and Combinatorics, Optimal Control, Operation Research, and/ or Mixed Statistics: consists of publication on Development and/ or Application of statistics in various aspects.

Arjuna Subject : Matematika - Matematika (Lain-Lain)

Articles 404 Documents

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Pengukuran Value At Risk (Var) Saham Perbankan Dalam Indeks IDX30 Dengan Metode Simulasi Historis wahdini wahdini; Media Rosha
Journal of Mathematics UNP Vol 6, No 4 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

The problem of the investor is to determine assets for invested until gets profits and not losses. Calculate value the risk using the measurement Value at Risk. The method used Historical Simulation Method by ignoring the normality and time series. This research using secondary data, closing price daily data of the stock banking listed on the IDX30 index in the period August 2020 - July 2021. Calculate data analysis of the daily return of a stock, determine the confident level and time period, estimate the maximum loss and calculate the value of the VaR of each stock. Based on the results of the research when the range of confident 95%, the time series of one day and the initial investment is assumed to Rp.100.000.000 to six banking stocks that BBCA Rp. 2.189.429, BBNI Rp.3.176.740, BBRI Rp. 3.129.625, BBTN Rp. 3.939.326, BMRI Rp. 3.348.373 and BTPS Rp.3. 953.960.

Prediksi Jumlah Zakat Melalui Angka Kemiskinan di Kota Padang dengan Menggunakan Metode Graybill Dwi Wahyu Wigati; Helma Helma
Journal of Mathematics UNP Vol 5, No 1 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–If want the poverty rate in the Padang City to drop by a certain amount, then the amount of zakat must be estimated. The research was conducted to obtain predictions of reducing poverty through the amount of zakat with inverse regression using the Graybill method. The data of this research is secondary data. Data obtained through the Padang City BAZNAS about the amount of zakat collected and through the BPS website Padang City about the percentage of poor people of Padang City in 2005-2017. The results of research obtained a prediction model of the amount of zakat that must be provided ( ) in Padang for poverty rates .Keywords–Poverty, Zakat, Inverse Regression, Graybill Method.

Model Matematika Penyebaran Virus Komputer dengan Eksistensi Programmer Virus Meri Mulyani; Media Rosha; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 2 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – On the article discussed the mathematical model SIRI (Susceptible, Infected, Recovered, and Infected) to describe the propagation behavior of computer virus under existence virus programmer. Based on the analysis, model has two the equilibrium points that are disease-free equilibrium point and endemic equilibrium point. Existence and stability of the equilibrium point was determined by the basic reproductive number. Disease-free equilibrium point always there and stable if the basic reproductive number is smaller than one, whereas endemic equilibrium point exists and stable only if the basic reproductive number is greater than one. Based on these results and a parameter analysis, the numerical simulation to illustrate the analytic results obtained.Keywords – Mathematical Model, Virus Programmer, Equilibrium Point, Stability, Basic Reproductive Number

Kajian Model Nonlinear Menggunakan Separable Programming dan Algoritma Genetika pada Lavera Konveksi Padang Cory Grahayu; Media Rosha
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract— Convection is a line of business in the finished clothing section that producess on a large scale or in massive. In the production process, in general the working of convection are not based on customer orders, but based on a standard size. Lavera convection is one of the famous convection in the city of Padang that has obstacles in controlling orders. The purpose of this study is to determine the shape of nonlinear models from optimization of production costs in Lavera Convection using Separable Programming and Genetic Algorithms. The type of research is applied research with secondary data type. The method of data collection was carried out by researchers to the Lavera Convection in Padang and followed by data collection. Separable Programming Method is a method for transforming nonlinear objective functions into linear objective function. By completing the schedulling model using the Genetic Algorithm, the result is the minimum production cost incrured is Rp. 65.223.468, 43 with 540 long-sleeved shirth, 540 collared shirts, 360 T-shirts, 540 training pants. Keywords—optimization, production, nonlinear programming, separable programming, genetic algorithms

Penerapan Metode Dekomposisi Sumudu untuk Menyelesaikan Persamaan Diferensial Biasa Orde Tiga Non Linear rizky hamdanih; riry sriningsih
Journal of Mathematics UNP Vol 4, No 3 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract– This research discusses about the third order non linear ordinary differential equations. To solve the third order non linear ordinary differential equation we can using the Sumudu decomposition method.The Sumudu decomposition method is a combination of the Sumudu transform and the decomposition method which involving Adomian polynomial. This study aims to determine the completion steps and solutions has obtained from the application of the Sumudu decomposition method in to the third order non linear ordinary differential equations. The final solution obtained from the Sumudu decomposition method is a series solution.Keywords– Ordinary Differential Equations (ODE), Third Order Non Linear ODE, Sumudu.

Model Matematika Penyebaran Penyakit Leptospirosis Pada Populasi Manusia Dan Hewan Delvika Gusdiani; Media Rosha
Journal of Mathematics UNP Vol 5, No 4 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v5i4.11092

Abstract — Leptospirosis is an infectious disease that can affect humans and animals. This infectious disease is an animal disease that can infect humans. This disease is a public health problem around the world, especially Indonesia which has high rainfall. Individuals most at risk of developing leptospirosis are farmers who work in rice fields, plantation workers, slaughterhouse workers and veterinarians, laboratory workers and veterinarians. The purpose of this study was to form a mathematical model of the spread of leptospirosis in human and animal populations. This research is a basic research using theoretical methods, namely analyzing relevant theories with the problem of the pread of leptospirosis in human and animal populations based on existing literature studies. Based on the analysis results obtained two fixed points, namely a fixed point free from the spread of leptospirosis and an endemic fixed point for the spread of leptospirosis. The stability of this model is stable at both fixed points of leptospirosis in human and animal populations. The high rate of leptospirosis in the population will cause leptospirosis to become epidemic in the population.Keywords — Mathematical Model, Infectious Diseases, Leptospirosis.

Karakteristik Distribusi Maxwell-Boltzmann Artina Puspita; Dewi Murni
Journal of Mathematics UNP Vol 3, No 1 (2018): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v3i1.4657

Abstract – This study discusses the characteristics of Maxwell-Boltzmann distribution. Each distribution has its own characteristics. The characteristics can be seen in the parameters are mean, variance, skewness, kurtosis, moment generating function and characteristic function. The purpose of this study is to determine the characteristics of the Maxwell-Boltzmann distribution. The steps of this research are looking for the mean, variance, skewness, kurtosis, moment generating function, and characteristic function of the Maxwell-Boltzmann distribution. The results of this research were obtained the parameters of the Maxwell-Boltzmann distribution: mean variance, skewness, kurtosis, generating function of the momen and characteristic function.

Metode Lowest Supply Lowest Cost (LSLC) Pada Masalah Transportasi Tidak Seimbang (Studi Kasus Pada Ditribusi Air Minum PT. Anugerah Berkah Bersaudara) Amellia Fadjri; Defri Ahmad
Journal of Mathematics UNP Vol 7, No 2 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Distribution of goods is very important for the company. In order to get a bigger profit, the company tries to deliver the goods in the most effective way possible. There are several warehouse locations and several destinations, with different shipping costs, so the distribution problem can be solved using transportation methods. There are many methods that can be used to determine the optimal solution to the transportation problem. In this study, the Lowest Supply Lowest Cost (LSLC) method was used to determine the initial solution and the Stepping Stone method was used to determine the optimal solution for the distribution of Bottled Drinking Water at PT. Anugerah Berkah Brothers, with the aim of minimizing transportation costs. Distribution problems at PT. Anugerah Berkah Brothers is an unbalanced transportation problem, because the amount of inventory is greater than the amount of demand. Based on the results of the discussion obtained that PT. Anugerah Berkah brothers can save transportation costs from before as much as 8% of the initial cost.

Strategi Kompetisi Antara Tokopedia Dan Shopee Menggunakan Teori Permainan Defrisa Yoga Putra; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

TEMASEK is a company from Singapore. Based on research initiated by TEMASEKand Google in 2015,internet users in Indonesia reached 92 million. 18 million of them are e-commerce connoisseurs and it is predicted that by 2025 there will be 119 million onIineshoppers in Indonesia. This increase will push the e-commerce market value to reach 81billionin 2025. This has resulted in many e-commerce popping up in Indonesia, the top two being Tokopedia and Shopee. Therefore, managers are required to determine what strategies will hook consumers. Game theory is used to find the optimaIstrategy for each pIayer.The purpose of study is to find the optimaIvaIue of the game.This study uses 5 marketing strategies, namely promotion/advertising, completeness, service, payment, and price. The population in this study is Mathematics Students from January to June 2021, the sample of this research is Mathematics students at Padang State University who have used Tokopedia and Shopee.There are two methods of solving, namely using a pure strategy or a mixed strategy.In this case, the settlement uses a pure strategy and theoptimaI vaIue of the game is 0,04 where Tokopedia comes out as the winner with a maximum profit that will be obtained which is 4% if using a price strategy, while Shopee will minimize losses with its strategy, namely a more diverse payment strategy

Optimasi Rute Pengiriman Barang dengan Meminimumkan Biaya Transportasi Menggunakan Metode Saving Matrix di PT. Amanah Insanillahia Rida arifi; Defri Ahmad
Journal of Mathematics UNP Vol 4, No 4 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract– The main problem in the distribution of stuff to consumers is the optimization of costs and shipping routes. PT. Amanah Insanillahia is a bottled mineral water company that distributes its products to every sub-district in Tanah Datar district. However, this company has not yet optimized its distribution cost. To do this optimization requires a transportation method to minimize costs and routes, namely the Saving Matrix method. The Saving Matrix method aims to determine the product distribution route to the marketing area by determining the distribution route that must be traversed and the number of vehicles based on the capacity of the vehicle in order to obtain the shortest route and minimum transportation costs. The results of the transportation costs of distributing stuff at PT. Amanah Insanillahia by using this method can reduce costs by 35.11% with the optimum distribution route of stuff, namely the first route delivers of stuff carried out, namely Pariangan and Batipuh Districts. The second route is the Sungayang and Rambatan Districts. The third route is Limo Kaum and Lintau Districts. The fourth route is Salimpaung and Sungai Tarab District. Finally the fifth route is Tanjung Emas District. Keywords– Saving Matrix, distribution of stuff

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Defri Ahmad

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Jl. Prof. dr. Hamka Air Tawar Barat Padang

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Kota padang,

Sumatera barat

INDONESIA