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All Journal JURNAL EKSAKTA PENDIDIKAN (JEP) Jurnal Cendekia : Jurnal Pendidikan Matematika Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran Journal of Mathematics UNP Rangkiang Mathematics Journal JURNAL MUARA PENDIDIKAN

Dewi Murni

Universitas Negeri Padang

Author-ID : 2756747

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Faktor-Faktor yang Mempengaruhi Kemiskinan di Sumatera Barat Menggunakan Metode Analisis Jalur Deska Warita; Dewi Murni; Yenni Kurniawati
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Poverty is a problem that until now has not been resolved by the government in Indonesia. West Sumatra is one of the provinces in Indonesia that did not escape from poverty. Formulation of the problem of this research are the factors that influence significantly poverty in West Sumatra and how much influence these factors against poverty in West Sumatra. Data were taken in 2013 in West Sumatra books in Figures 2014. This research in the form of research by using path analysis method, a method that can analyze the factors that influence directly and indirectly to poverty. Factors that affect directly poverty is unemployment and education, whereas the factors that influence indirectly poverty is education and GDP.Keywords – path analysis, poverty, factors that affect poverty.

Analisis Metode Homotopi dalam Menyelesaikan Persamaan Lorenz Robi Kurniawan; Dewi Murni
Journal of Mathematics UNP Vol 4, No 1 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract Lorenz equations is one of the result of mathematical modeling of the three dimensional phenomenon of convection (air) in the atmosphere. In recent years, the Lorenz equations has attracted the attention of scientists and engineering because of the phenomenon chaos was produced. The complexity of the chaos produced cause the Lorenz equations to be very difficult to solve. This study aims to solve the Lorenz equations by using homotopy analysis method and then comparing it with the approximation on the ode45 solver. Solution using a homotopy method is done by constructing a zero-order deformation equation into a high-order deformation equation. In this method there is freedom in choosing a auxiliary linear operator, initial approximation, and convergent–control parameter that can guarantee the convergence solution. The resulting approximation is a series. The results of the study obtained 10th order homotopy approximation from the Lorenz equations, which is when it approach the ode45 approximation. Unfortunatelly the period of homotopy approximation is a very short.Keywords Lorenz equations, Chaos, Homotopy Method.

Optimalisasi Biaya dan Waktu Pelaksanaan Proyek Pembangunan dengan Metode PERT-CPM sari maryani; dewi murni
Journal of Mathematics UNP Vol 4, No 3 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract— Project is a combination of several resources such as capital / costs, human, material and equipment in a temporary organization that aims to achieve certain goals.Estimating the duration and improper costs at this step will affect the implementation of activities and the results obtained. This researchpurpose to optimize the duration and cost of implementing the PLUT-KUMKM development project in Sumatra Barat with PERT-CPM method then followed by crashing. This research uses data on project activities, the sequence and cost of each activity. The results of this research can optimize the project implementation time with almost the same cost, from 21 weeks become 18 weeks. It means thatthe project implementation time can be accelerated by 14,3 % of the initial duration. With project implementation cost Rp.1.724.873.973,93 to Rp.1,787,703,844.13.Keywords—Project, PERT-CPM, crashing

Peramalan Jumlah Pengunjung Objek Wisata Waterboom Kota Sawahlunto Tahun 2019 Menggunakan Metode SARIMA ulfah hanum; dewi murni
Journal of Mathematics UNP Vol 4, No 3 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–The visitors of tourist attraction will change and tend to be inconsistent over the tim, one of them is Waterboom which is located in Sawahlunto. This tourist object lacks of public facilities when it shows the increasing number of the visitors. Therefore, it is needed to make a prediction as the base in decision making. This research to make a model ARIMA and to get the prediction’s result of the total number of the Waterboom’s visitors in 2019. The data used are the number of the Waterboom’s visitors from January, 2014 up to December, 2018. Data analysis using the Seasonal Autoregressive Integrated Moving Average (SARIMA). This method consists of identification model, falsification stage and parameter testing, diagnostic stage, and forecasting stage. The analysis’s result in this study gets the best model for predicting data of the total number of the visitors of Waterboom in Sawahlunto that is ARIMA(1,1,1)(0,1,0)12, and this model is used to make a prediction in the next 12 periods.Keywords–The Number of visitors, SARIMA’s Model, Forecasting

Faktor-Faktor yang Menyebabkan Penyakit Gastritis pada Pasien di Puskesmas Tanjung Beringin Kabupaten Pesisir Selatan dengan Menggunakan Analisis Faktor setia ningsih m; dewi murni
Journal of Mathematics UNP Vol 4, No 3 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–Gastritis or commonly referred as magh/ulcer is an inflammation that could result in swelling mucosa of ulcer and dyspepsia. Gastritis is one of the top ten diseases in Tanjung Beringin Health Center, Pesisir Selatan District and has an increase in the number of gastritris patients every year start from 2016 to 2018. This research was conducted with the purpose of knowing the cause of gastritis patients at the Tanjung Beringin Health Center, Pesisir Selatan District. In this research used primary data with shared some questionnaires to 88 people who suffer of gastritis in the Tanjung Beringin Health Center, Pesisir Selatan District. One of the statistical analyzes used in this research is factor analysis. Based on research result there two factors that being cause gastritis disease in patients at the Tanjung Beringin Health Center, Pesisir Selatan District 1) dietary habit, drinking caffeine/coffee habits and smoking 2) Age, drug habits and stress.Keywords–Gastritis, Dietary Habit, Factor Analysis.

Menentukan Determinan Matriks Persegi Panjang Menggunakan Bahasa C++ Diego Armando Piero; Dewi Murni
Journal of Mathematics UNP Vol 5, No 4 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — One study in matrix theory is determinant. Matrix determinants are widely used in solving matrix problems, such as: determining eigenvalues, systems solutions of linear and inverse equations. In determining a determinant of a square matrix is usually not easy especially with a large order matrix. The concept of determinant that has been known is generally true for square matrices. In this research, it will be studied about its development, which is about the determinant of non-square matrix (rectangular matrix). This research is a theoretical research through library research on determinant theories and programming theories. The purpose of this research is to determine the determinant of a rectangular matrix using C ++ language. The method used is the analysis of theories relevant to the problem of calculating rectangular matrix determinants using the C ++ language. The results of thestudy are produced programs that can determine the determinant of a rectangular matrix.Keywords — determinant, matrix, radic method, programming.

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

Analisis Faktor-Faktor yang Mempengaruhi Tingkat Pengangguran Terbuka di Sumatera Menggunakan Metode Multivariate Adaptive Regression Spline (MARS) Liska Andani; Dewi Murni
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract— Open Unemployment Rate (OUR) is defined as the percentage ratio of the number of open unemployment to the total labor force. In 2018, for 5 provinces in Sumatra, those are the provinces of Riau Islands, Aceh, Riau, North Sumatra and West Sumatra, the OUR value was relatively high and exceeded the OUR value in Indonesia, which was 5.34 percent. This study aims to look at the significant factors that influence OUR in Sumatra in 2018 at the best model obtained with research data in the form of secondary data obtained from the BPS-Statistics and analyzed using the Multivariate Adaptive Regression Spline (MARS) method. The best model obtained is the result of a combination of BF= 28, MI= 2, MO= 4 with the Generalized Cross Validation (GCV) value of 0,09413 as the minimum GCV value and the factors that influence the OUR, those are the independent variables X1, X2, X4, X6, and X7 with R2adj of 81.4 percent and factors that did not affect the independent variable were the number of households (X3) and the average expenditure per capita a month for food (X5). Keywords— open unemployment rate, MARS, GCV.

Optimalisasi Portofolio Saham dengan Simulasi Monte Carlo untuk Pengukuran Value at Risk (VaR) Sarah Hardiana; Muhammad Subhan; Dewi Murni
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Value at Risk (VaR) is the one of statistical measurement tools that measures the maximum expected loss from an investment on the certain confidence level and certain time period on normal market condition. One of the method to determine VaR value is Monte Carlo Simulation Method. The purpose of this paper is forming the optimal portfolio with VaR value. The type of reseaech is applied research using secondary data that is daily closing price stock LQ-45 about 6 months. The steps are determine the parameters, simulating the return value randomly, and calculate VaR value average. Based the result generated the optimal portfolio at the rate of return specified and by the smallest VaR value.Keywords – Portfolio, Value at Risk (VaR), Monte Carlo Simulation, stock

Optimasi Biaya Distribusi Pengiriman Beras Sejahtera pada Perum Bulog Divisi Regional Sumatera Barat dengan Kombinasi North West Corner Method (NWCM) dan Stepping Stone Method (SSM) Yeni Feriza; Dewi Murni
Journal of Mathematics UNP Vol 5, No 1 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — The problem that the transportation model wants to solve is the determination of the distribution of goods which will minimize the total cost of distribution. Perum Bulog of the West Sumatra Regional Division as the executor of the prosperous rice program for several regions spent quite large funds for distribution activities, one of which was distribution in Padang Pariaman Regency. A transportation method is needed to find the best solution of the transportation problem (transportation), which are NWCM and SSM. NWCM as an initial method serves to determine the initial distribution allocation which will make all resource capacity allocated to all destinations, while SSM is an optimization test. The results of the calculation of the cost of distribution with NWCM are IDR27,967,340. Continued by an SSM of IDR 25,227,010. While the total real cost is, So that the calculation of the cost of distributing prosperous rice delivery using SSM is the optimum cost, the company can save transportation costs by IDR 3,335,130 or by 12%. Keywords — NWCM, SSM, Distribution fees.

Co-Authors Abdullah Husein Ardi Ardi Armiati Armiati Artina Puspita Avea Kristerima Gulo Bayu Kurnia Putra Deska Warita Diah Rahmahadi Thamrin Diego Armando Piero Diego Armando Piero Dwi Shinta Kumala Ningsih Elfiani Sarian Bur Envi Sari Oktaviani Fanesa Larasati Fariz Rivalno Fatimah Putri Johari Fauziah Hervi Fiona Melta Fira Septiyani Ibrahim Helma Helma Helma Helma Hendra Syarifuddin Ihsan Kamil Irfan Syauqi Julian Heru Saputra Khairul Alim Liska Andani Liska Andani Mamad Hardiyanto Media Rosha Meira Parma Dewi Mirna Mirna Moni Sarisa Mudjiran Mudjiran Mudjiran Mudjiran Muhammad Danil Muhammad Subhan Nada Atifah Nadia Liaf Putri Nilam Purnama Sari Nurhizrah Gistituati Putji Alfayulanda Rahmatika Rahmatika Rara Sandhy Winanda Rimpi Oktaria Riry Sriningsih Robi Kurniawan Rohadatul Aysi Rusdinal Rusdinal Sarah Hardiana sari maryani setia ningsih m Shintia Pratiwi Solly Aryza Suherman Suherman Ulfa Zuliantika ulfah hanum Wanari Intan Dwi Putri Yeni Feriza Yenni Kurniawati Yerizon Yerizon Yerizon Yerizon

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