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All Journal IndoMath: Indonesia Mathematics Education Journal of Mathematics UNP Rangkiang Mathematics Journal

Media Rosha

Universitas Negeri Padang

Author-ID : 2756730

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

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Model Matematika Penyebaran Penyakit Leptospirosis Pada Populasi Manusia Dan Hewan Delvika Gusdiani; Media Rosha
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

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 spread 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.

Model Matematika Pengaruh Lingkungan Terhadap Bertambahnya Pengkonsumsi Alkohol Bayu Kurnia Putra; Media Rosha; Dewi Murni
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – In this article discussed the mathematical model increacing influence of environment on consuming alcohol. This research was started by forming mathematical model increacing influence of environment on consuming alcohol in the of non-linear differential equations system. From the analysis mathematical model increacing influence of environment on consuming alcohol, there are two types of equilibrium point. Free equilibrium point of consuming alcohol and equilibrium point of consuming alcohol. Terms existence and stability of the equilibrium point is determined by the basic reproduction number. By analyzing the model, obtained the stability of each equilibrium pointsKeywords – Mathematical Model, Alcohol, Equilibrium, Stability, Basic Reproductive Number

Faktor – Faktor yang Mempengaruhi Mahasiswa Jurusan Matematika FMIPA UNP Memanfaatkan Jasa Goride Menggunakan Analisis Faktor Rahmatina Rahmatina; Media Rosha
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — Students need transportation to get to campus or other locations. The transportation needed is transportation that is safe, comfortable, and can access the destination in a short time. Traffic access to Padang State University is a heavy traffic lane, so it often experiences congestion. So transportation that can solve the problem is needed. Many types of transportation services are available in Padang City, but for certain locations it cannot be reached by using one transportation service, resulting in time and cost inefficiency. Goride is a Gojek service which is a two-wheeled vehicle transportation service, so its use can shorten travel time in the middle of a traffic jam. This type of research is applied research with primary data obtained from distributing online questionnaires consisting of 36 questions. The number of respondents was 90 students of Mathematics, Faculty of Mathematics and Natural Sciences at the State University of Padang, who had used the services of Goride at least twice. Basedion the results of the studys, two factors were found to influence it. The first factor is built by product, price, promotion, place and time, human, and process variables. The second factor is built by the variables of physical facilities and customer service. Keywords — Factor Analysis, Goride Online Transportations, Decision Factor

Peramalan Ekspor Minyak Kelapa Sawit Indonesia Menggunakan Metode Pemulusan Eksponensial Tripel Tipe Brown Istima Istima; Media Rosha; Meira Parma Dewi
Journal of Mathematics UNP Vol 6, No 2 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Palm oil is one of the non oil and natural gas export commodities in Indonesia that has a high economic value and becomes one of the country’s foreign exchange earner. The increase of the world market needs of palm oil will certainly affect export activities. Therefore, the exports of palm oil for the next few years need to be predicted so that the government can make planning and do appropriate actions. The method used was the Tripel Exponential Smoothing Method Type Brown. This method is a one parameter quantitative forecasting method for time series data that are quadratic trend. The forecast accuracy measure used was Mean Square Error (MSE) to determine the ideal parameter. The forecast model obtained was . The forecast of the exports of Indonesian palm oil in 2015 to 2019 were between 24.509,329 thousand tons to 33.563,659 thousand tons. Keywords – forecasting, export, palm oil, tripel exponential smoothing method type brown

Faktor Yang Mempengaruhi Tingkat Pengembalian Kredit Pada Program Simpan Pinjam Kelompok Perempuan (SPP) Menggunakan Analisis Regresi Logistik Biner Julinda Lestari; Media Rosha
Journal of Mathematics UNP Vol 5, No 1 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–Simpan Pinjam Kelompok Perempuan (SPP) is one of the PNPM-MPd programs that lend capital to women's groups to improve household economy. The research is conducted to determine some factors that significantly influence the level of credit repayment in the SPP program in Padang Sago Subdistrict. We use a primary data obtained from interviews by using questionnaire. The questionnaire consisted of 12 questions were distributed to 50 respondents who made SPP credit payments in September 2019. The analysis method used in this study is binary regression with the rate of credit repayment as dependent variables. The regression parameters are estimated by using MLE technique, the model is constructed by using backward elimination method, and interpreted by using odds ratio. Based on the result we acquire two independent variables that are significantly affect to the rate of credit repayment i.e the loan amount and the short-term credit refund period. Keywords–Simpan Pinjam Kelompok Perempuan (SPP), credit repayment rate, binary logistic regression

Aplikasi Metode Single Index dalam Pembentukan Portofolio Optimal dari Indeks Saham LQ – 45 Muhammad Hafizh Ekaputra; Media Rosha
Journal of Mathematics UNP Vol 5, No 4 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — Investment is the activity of placing a number of funds at the present time with the aim of obtaining future benefits. The problem faced by investors is determining which stocks to choose in order to get maximum profit. Steps taken in order to get maximum profit is to form an optimal portfolio. The purpose of this study is to form an optimal portfolio of stocks incorporated in LQ-45 in the period August 2018 - July 2019 and determine the proportion of funds for each member of the optimal portfolio formed using the single index method. This study uses secondary data obtained from Yahoo Finance and Bank Indonesia. Purposive sampling is the sampling technique used. There are 41 stocks that still survive during the obser. vation period. The results of the analysis obtained from 41 LQ-45 stocks are that there are four stocks that are included in the optimal portfolio, namely; ADHI, EXCL, MNCN and TLKM with each proportion of funds of 4.081944%, 9.9706955%, 3.1884027%, and 82.7589578%.Keywords --- investation, portofolio, single index method

Analisis Portofolio Optimal Menggunakan Metode Multi Objektif pada Saham Jakarta Islamic Index Efriandi Dwi Septyanto; Media Rosha
Journal of Mathematics UNP Vol 4, No 1 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract- Multi-Objective method for portfolio is a portfolio that is aimed to minimize the risks and maximize the expected return at the same time.The multi-objective optimization can be solved with scalarization which is a standard technique to find the optimum points for each optimization vector problems.The purpose of the research is to find out how to build optimal portfolios with optimization method of Multi-Objective and to know the proportion of their respective shares of the selected Jakarta Islamic Index in the optimal portfolio. The steps were taking the data of the stock prices of the companies that have been selected, calculating the expected return and variance-covariance of the return for each stocks, calculating the value of the portfolio of each stocks, and calculating the value of expected return of a portfolio that is formed using the method of Multi objective. The research results obtained optimal portfolios which was measured using coefficient k=10 with the capital sharing that was invested stock to ASII, CPIN,CTRA, EXCL, ICBP, PTBA, SMGR, and TLKM with proportion stock are 18,61%, 29,60%, 0,30%, 0,44% , 28,70%, 6,91%, 7,92%, dan 7,52%. Keywords: Multi Objective Methods, shares of JII, Optimal Portfolio

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.

Analisis Risiko Investasi pada Portofoliodengan Value at Risk (VaR) Menggunakan Simulasi Monte Carlo Afra Moudi Luthfiyanti; Media Rosha
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract— Investment is the placement of a number of funds at this time for the purpose to obtain a number of benefits in the future. In investing, Value at Risk is needed as a measurement tool that serves as a risk estimator that will occur. The method used to calculate VaR is the Monte Carlo Simulation method that performs simulations by generating random numbers. The data used in this study is secondary data, that is data on the closing price of Unilever and Telekomunikasi stock in the June 2019-November 2019 period. The data analysis technique used is calculate stock returns, conduct a normality test, simulate the return value using parameter estimation, estimate the maximum loss, calculate the VaR value and the average of VaR. Based on research result at a 95% confidence level, a period of one day and an initial investment fund is assumed it is possibility of losses amounted to .Keywords— investment, Value at Risk (VaR), Monte Carlo simulation.

Model Matematika Penyebaran Penyakit Herpes Genital dengan Vaksinasi Aziza Masli; Media Rosha
Journal of Mathematics UNP Vol 5, No 4 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — Genital herpes is an infectious disease that can be transmitted and caused by Herpes Simplex Virus type 2 (HSV-2). According to WHO, genital herpes caused by HSV-2 is a global issue and it is estimated that 491 million people in the world are living with HSV-2 infection in 2016. Health observers are looking for solutions to the spread of genital herpes by developing prophylactic protection vaccines. In this research, a mathematical model of the spread of genital herpes with vaccination will be sought. The purpose of this study is to learn how to use vaccination against the spread of genital herpes. This study is a basic study using descriptive method. This method is done by analyzing theories relating to the problem. The study began by determining the variables, parameters, and assumptions that related to the spread of genital herpes with vaccination. The results of the analysis show that high rates of disease transmission can lead to diseas outbreak. In addition, increasing the precentage of successful vaccines can reduce the spread of genital herpes so that outbreaks not occur.Keywords — mathematics model, genital herpes, vaccination.

Co-Authors Afdal Afdal Afdhal Ahkrizal Afra Moudi Luthfiyanti Afra Moudi Luthfiyanti Aziza Masli Aziza Masli Bayu Kurnia Putra Cory Grahayu Cory Grahayu Delvika Gusdiani Delvika Gusdiani Dewi Murni Doni Rahmat Septiano Efriandi Dwi Septyanto Fanny Rahmatina Rahim Fathiya Putri Dayustin Febriani Febriani Febriani Febriani ike mairita sari Istima Istima Julinda Lestari Kurnia Apridita Utami Lani Widia Putri Meira Parma Dewi Meira Parma Dewi Melly Kurniawati Meri Mulyani Muhammad Hafizh Ekaputra Muhammad Hafizh Ekaputra Muhammad Subhan Nofria Ulfah Nonong Amalita Qodriyah Qoyyim Qodriyah Qoyyim Randy Rahayu Melta Riry Sriningsih Rozi Wahyudi Sintia Arzelina Syafriandi Syafriandi tomy aprinaldi Tria Agus Krisan Wahdini Wahdini

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