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All Journal JURNAL DERIVAT: JURNAL MATEMATIKA DAN PENDIDIKAN MATEMATIKA LEMMA: Letters Of Mathematics Education Seminar Nasional Teknologi Informasi Komunikasi dan Industri BAREKENG: Jurnal Ilmu Matematika dan Terapan JURNAL PENDIDIKAN TAMBUSAI 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 Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Pengukuran Efisiensi Komoditi Industri Kerajinan Kabupaten Agam Menggunakan Metode Data Envelopment Analysis (DEA) Nurainun Pulungan; Arnellis Arnellis; Riry Sriningsih
Journal of Mathematics UNP Vol 4, No 1 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Small and medium industries of Agam regency consist of five groups where one of them is craft industry that has a number of business units in Agam regency. To get more profit, measurement of efficiency needs to be done to improve productivity of craft industry. Method to measure level of efficiency is Data Envelopment Analysis (DEA) method. DEA method is linear programming model based on the measurement of efficiency a Decision-Making Unit (DMU) and uses a lot of inputs and outputs. The units will be measured those efficiency are commodities of craft industries with the production capacity of quantity unit. The measurement of efficiency commodities generates efficient and inefficiency DMU by using model of DEA. The level efficiency of inefficient DMU can be improved by utilizing the value of slack variables. After target calculation for improvements inefficient DMU and measurements of efficiency is again so that value of efficiency increases.Keywords – Efficiency, Data Envelopment Analysis, Inefficiency, Slack, Target.

Model Mangsa Pemangsa dengan Pengaruh Musim yudi Arpa; Muhammad Subhan; Riry Sriningsih
Journal of Mathematics UNP Vol 2, No 1 (2014): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract- Effect of season is one of the factors that need to be noted in the predation. In this study, used the four seasons, summer, winter, spring, and autumn, where the amount of predation different every season. The study began by establishing a mathematical model of predation to the effect of the season. In this model, the population is divided into two, prey populations and predator populations. With useful analysis model using perturbation theory note that the effect of the season had a significant effect on the growth patterns of prey and predator populations, where at any given time pattern of prey and predator population Growth Is changing. Keyword :Predator-Prey, Seasonal effect, Mathematical models, Perturbation theory.

Portofolio Mean Variance Efficient Dua Konstrain Pada 15 Saham Indeks LQ45 Fariz Rivalno; Dewi Murni; Riry Sriningsih
Journal of Mathematics UNP Vol 4, No 1 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Portfolio is an investment tool in stocks that divide capital into a number of stocks according to the weight or percentage determined by the investor. For that, investors need to establish an optimal portfolio. One of the optimal portfolio methods is Mean Variance Efficient Two Constraints Portfolio. The purpose of this study is to obtain a formula for determining the investment weight and its application onMean Variance Efficient Two Constraints Portfolio to obtain minimal investment risk from 15 LQ45 Index stocks. The type of this research is applied research. The type of data is secondary data, in the form of closing pricestocks on the LQ45 Index period of November 9th, 2016 - March 2nd, 2017. Steps in the establishment of a portfolio is calculate the return, average return, variance return, covariance return, and find weight investment through formula on the portfolio. The result of this research is obtained a formula for determining the investment weight on Mean Variance Efficient Two Constraints Portfolio and formed an optimal portfolio on 15 LQ45 Index stocks. The portfolio provides 0.07% average return and 0.01% risk. Keywords –Constraint, LQ45 Index, Portfolio, Return, Stocks

Analisis Korelasi Kanonik Hubungan Lingkungan Pendidikan terhadap Prestasi Belajar Riski Dwi Rianto Putra; Atus Armadi Purta; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 2 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – The learning achievement is the result of learning achieved in the form of value. Environmental education is one of the factors that influence learning achievement. To see the relationship between environmental education with student achievement SMP Lanud Padang used statistical analysis canonical correlation analysis. Canonical correlation analysis is used to see the relationship between dependent variables with independent variables. The results showed that the relationship between environmental education with student achievement class VII Space Lanud Padang can not be known, because the analysis could not proceed to the stage interpretation of the canonical variables. However, based on the value of the P-Value between environmental variables and the variables education learning achievement can be seen learning achievement is affected by a significant educational environment, including PAI, PKN, Indonesian and English. And school environments have the most impact on student learning in junior high presatasi Space Lanud Padang. Keywords – Learning achievement, environmental education, canonical correlation analysis

Model Matematika Jumlah Pemakai Narkoba dengan Program Rehabilitasi Eli Yuliza; Media Rosha; Riry Sriningsih
Journal of Mathematics UNP Vol 2, No 1 (2014): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–In the number of drug users in Indonesia each year has increased very significantly, so this problem should be addressed immediately.Currently, the government has organized rehabilitation program that is expected to reduce the number of drug users in the future. To predict the number of drug users, can be done by creating a mathematical model of the number of drug users. Mathematical model number of drug users in rehabilitation programs dividing the population into four groups of individuals: the group of susceptible individuals for drug use, drug user groups of individuals, groups of individuals are rehabilitated, and a group of individuals who have stopped using drugs. Mathematical model that formed were analyzed by looking at the stability, the analysis of mathematical models obtained two types of fixed points. In the number of drug users is affected by four parameters: the level of interaction between individuals prone to drug use by individual drug users, the level of individual drug users to be individuals who stop using drugs, and individual level drug offenders to be rehabilitated individuals. Keywords–Drugs, mathematical model, fixed point.

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

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 Saskia Perdani, Ladyra Soleh, Mohammad Soleh Subiono - Vhinasy Andari Wartono Wartono Wartono Wartono Yoga Perdana yudi Arpa

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