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All Journal JURNAL DERIVAT: JURNAL MATEMATIKA DAN PENDIDIKAN MATEMATIKA LEMMA: Letters Of Mathematics Education BAREKENG: Jurnal Ilmu Matematika dan Terapan Pelita Eksakta Jurnal Litbang Edusaintech Journal of Mathematics UNP

Riry Sriningsih

Mathematics Department Universitas Negeri Padang

Author-ID : 2756495

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Physics Transportation Other

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Peramalan Jumlah Produksi Kayu Manis di Sumatera Barat dengan Metode Pemulusan Eksponensial Tripel Tipe Brown Athifah Rahmi; Helma Helma; Riry Sriningsih
Journal of Mathematics UNP Vol 3, No 2 (2018): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract - Cassiavera in West Sumatra is part of the plantation sector, which provides largest export value to local revenue. However, in 2006-2015 the total of cassiavera’s production of West Sumatra has decreased fluctuation. Therefore it is necessary to estimate the amount of cassiavera production in future. The purpose of study was to determine total’s mode of cassiavera’s production in West Sumatra, Kab. Tanah Datar and Kab. Agam and know the results of the forecast production quantities of cassiavera. The data used is BPS data’s in Padang city 2006-2015. The method used is the method of Triple Exponential Smoothing Brown mode with parameter α. When setting parameter α then used MSE (Mean Square Error). The results of the forecast production total of cassiavera in three regions in 2016-2020 sequentially in tonnes is 29531.88, 31505.98, 33869.79, 36623.31 and 39766.54; 2660.16, 2334.63, 1999.18, 1653.79 and 1298.47; 4783.84, 4652.65, 4518.58, 4381.63 and 4241.81.

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

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 Toksoplasmosis Resti Indrawati Utami; Riry Sriningsih
Journal of Mathematics UNP Vol 3, No 1 (2018): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract– Toxoplasmosis is a disease that affected by Toxoplasma gondii parasite which have latent (asymptomatic) characteristic. Toxoplasmosis disease was spreading vertically and horizontally. Spreading vertically through mother to kids and spreading horizontally through uncooked that contain of ookista. Toxoplasmosis disease can affect to serious health problems including physical disability, miscarriage and death. To determine influence level of Toxoplasmosis disease spreading, mathematic model was divided population by four individual groups: susceptible individual, latent individual, infection individual and controlled individual. Mathematical model formed was analysed by looking at its stability, analysis result was obtained fixed stability point. Increase in sum of individuals Toxoplasmosis disease spreading was affected by three parameters, which were susceptible individual moving to latent individual due to consume the foods that contain of ookista, individual that infected due to decrease immune system, and controlled individual or given treatment.

Model Matematika Persediaan Barang karena Adanya Kerusakan dengan Tingkat Permintaan Eksponensial dan Partial Backlogging Iswarnedi Iswarnedi; Muhammad Subhan; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 2 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Inventory control by companies is needed to ensure of customers’s demand. Optimal order quantity is a model that uses for counting the optimal total of an item, which could be bought or produced to minimize the costs, both in terms of supplies and processing order purchase. The purpose of this research is to form the inventory model for deteriorating item with exponential demand rate. The method is descriptive method by analyzing the theories which are relevant to the problem. Finally, we get the model form and numerical example that is given to illustrate the model.Keywords– mathematical model, inventory, exponensialdemandrate,deterioration,partialbacklogging

Menentukan Luas Daerah Segitiga Spheris Mulyadi Mulyadi; Mirna Mirna; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract - Spherical Triangle is a triangle on surface of ball that formed by circles which cutting the ball. The circle that forms a Spherical Triangle are circles which cutting the ball in center. Area of Spherical Triangle is different from Euclid Triangle. This study look at how to find the Area of Spherical Triangle. The result obtained in this study is how to find the area of Spherical Triangle that must knows about dihedral angle or trihedral angle that forms spherical triangle.Keywords - spherical triangle, dihedral angle, trihedral angle.

Model Matematika Pengaruh Lingkungan Terhadap Dinamika Jumlah Populasi Pejudi Rozi Wahyudi; Media Rosha; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 2 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – The article discussed mathematical model of the environmental influences to dynamics of gambler population. This research was started with forming mathematical model of the environmental influences to dynamics of gambler population in non-linear differential equations system. Based on analysis model, there are two types of equilibrium point that are free equilibrium point of gambler and endemic equilibrium point. Existence and stability of the equilibrium points are determined by the basic reproduction number. By analyzing the model, obtained the stability of each equilibrium points.Keywords – mathematical model, gambler, equilibrium, stability, basic reproductive number

Model Fenomena Imbibisi Kontra-Arus pada Media Berpori Homogen dalam Arah Horizontal Vhinasy Andari; Muhammad Subhan; Riry Sriningsih
Journal of Mathematics UNP Vol 4, No 1 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract –The imbibition phenomenon is spontaneous flow of injected liquid (water) to the medium, causing displacement of native liquid (oil) to production wells. This phenomenon occurs in homogeneous porous medium. If oil is still in the medium then oil production is not yet optimally.To observe and analyze the phenomenon we usemathematical model. This model of imbibition phenomenon in form of nonlinear partial differential equations and the solution can be determined. The analysis representsoil that can be produced optimally if the saturation of water is increasing with respect to period as well as with respect to distance. Keywords – Mathematical Model, Imbibition Phenomenon, Homogeneous Porous Medium, Partial Differential Equations

Model Penentuan Hari Dari Sebuah Tanggal Randy Rahayu Melta; Media Rosha; Riry Sriningsih
Journal of Mathematics UNP Vol 3, No 2 (2018): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract –This article discusses the pricing models of a date. This discussion began by making Sunday of date January 1, 1758M as a reference for determine desired day. This is due before 1758M the time was corrected that cause in a year have an irregular pattern. An models analysis using modulo 7, that can implemented to Turbo Pascal algorithm by entering the date, month and year which are desired so that obtained the desired day.

Optimalisasi Portofolio Saham LQ-45 menggunakan Model Indeks Tunggal dan Pengukuran Value at Risk dengan Variance Covariance Yoga Perdana; Dony Permana; Riry Sriningsih
Journal of Mathematics UNP Vol 3, No 1 (2018): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Investments are placing a current amount of funds with the aim of making a profit in the future. The problem faced by investors is to determine which assets should be selected to obtainmaximum profit and minimum losses. This research aims to determine the amount of proportion of funds invested into the optimal portfolio and to know the value of Value at Risk (VaR) on stocks that go into the optimal portfolio. Based on research on LQ-45 stock group found 15 stocks enter into the optimal portfolio from 45 shares of the company. Bank Tabungan Negara (Persero) Tbk. (BBTN) has proportion 18.01% as the largest propotion of funds. Based on the calculation of VaR in the optimal portfolio, obtained VaR value of 8,747,069, which means if investors invest funds in the portfolio of Rp 100,000,000.00 maximum losses to be suffered by investors with 95% confidence level will not exceed Rp 8,747,069.00.

Co-Authors Alifta Ainurrochmah Annisya Annisya Arnellis Arnellis Athifah Rahmi Atus Armadi Purta Dani, Andrea Tri Rian Dewi Murni Dony Permana Elfira Safitri Eli Yuliza Ermawati Ermawati Fariz Rivalno Helma Helma Helma Helma Hendra Syarifuddin Idhia Sriliana Irma Suryani Iswarnedi Iswarnedi Jamhari Jamhari Khairil Amri Media Rosha Media Rosha Melvy Utari Permadhi Meri Mulyani Minora Longgom Nasution Mirna Mirna Mohammad Soleh MUHAMMAD SUBHAN Muhammad Subhan Mulyadi Mulyadi NARITA YURI ADRIANINGSIH Nazvira, Mutia Nurainun Pulungan putra, farhan maulana Randy Rahayu Melta Raudhatul Jannah A.M Resti Indrawati Utami Riski Dwi Rianto Putra rizky hamdanih Rozi Wahyudi Soleh, Mohammad Soleh Vhinasy Andari Wartono Wartono Wartono Wartono Yoga Perdana yudi Arpa

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