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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

10 11 12 13 14

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 Keoptimalan Jaringan Transmisi Nasional Provinsi Sumatera Barat dengan Algoritma Prim Nafiha Irsyam; Yusmet Rizal
Journal of Mathematics UNP Vol 5, No 2 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — Electricity is one of the main requirement for supporting and compliances the needs of human life. Consumption of electricity continues to increase caused by many residential areas and large industries built also many locations need electricity. Electric power must be developed in line with the increasing demand for electricity, but the installation of electric cables are sometimes inefficient and spending lots of charge. The purpose of this study is to determine the optimal length of electric cables in the national transmission network of West Sumatra. This study begins by representing the map of the National Transmission Network of West Sumatera into a connected, weighted and undirected graph, then determining the minimum spanning tree using Prim Algorithm. The result of this research is electrical cables on the transmission network with Prim Algorithm is more optimal. Keywords — Transmission Network, Optimization, Prim Algorithm.

Quadrupel Bilangan Bulat (a,b,c,d) yang Memenuhi a^2+b^2+c^2=d^2 Qodriyah Qoyyim; Media Rosha
Journal of Mathematics UNP Vol 5, No 3 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract — An integer if it satisfies the Pythagorean theorem is called a “Triple Pythagoras” where there is already a building formula from Euclides to determine integers and that .The next problem is how to construct the formula to determine the integers of quadruple and that satisfy This research is a theoretical research based on literature study. The purpose of this research is to determine the formula of integer’s quadruple and that satisfy and to determine the form that has been obtained. The formula by the first way is obtained , , , with terms is an odd integer, not a prime number, and are factor from which is The formula by the second way is with terms and are member of sets {5, 13, 17, 25, 29, …} also applies to it multiplies. Thus formula by the first way obtained (4,7,4,9), (4,13,16,21), etc. And formula by the second way obtained (3,4,12,13), (9,12,8,17), etc. Keywords — Integer, Pythagorean Triple, Euclides' Formulas, Integer’s Quadruple.

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.

Pengukuran Kinerja Portofolio Optimal Model Stochastic Dominance Pada Indeks LQ-45 Masa Pandemi Covid-19 Sintia Arzelina; Media Rosha
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract－ Investment is one aspect that is in the spotlight of investors during the outbreak of the Covid-19 pandemic. Investing cannot be separated from the words return and risk, to optimize the rate of return and minimize risk, a portfolio of Stochastic Dominance models can be formed. This study aims to form an optimal portfolio of the LQ-45 Index during the Covid-19 pandemic by applying the stochastic dominance model as well as measuring the optimal portfolio performance formed by three measurement methods, namely the Jensen Index, Treynor Index, and the Jensen Index. Based on the analysis conducted on 10 stocks, the LQ-45 Index produces 9 dominant stocks. The nine stocks and their proportions are INCO 17.587%, ERAA 14.286%, INKP 14.286%, SCMA 14.285%, TBIG 14.286%, ANTM 14.286%, PTPP 3.571%, TKIM 3.571%, and WIKA 3.571%. The expected return and risk generated by the portfolio formed are 0.1267134 and 0.00762, respectively. Performance measurement with the Sharpe Index, Treynor Index, and Jensen Index both produce positive performance, in other words the formed portfolio has a good performance.

Metode Tipe Newton Bebas Turunan untuk Menentukan Akar Persamaan Tak Linier Engki Mai Putra; Muhammad Subhan; Yusmet Rizal
Journal of Mathematics UNP Vol 4, No 2 (2019): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract –Newton Method and Potra-Ptak Method are an iterative method which is used for solving nonlinear equation. Both of those method still have low order. Newton Method has second order convergence and Potra-Ptak Method has third order convergence. It make those method slow in getting roots approximation. Therefore, researcher modify both of those method use Taylor Series to increase the order of convergence, so we obtain Newton Type Derivative Free Method. So that, the purpose of this research is finding the roots of nonlinear equations using Derivative Free Newton Type Method, making the algorithm and determining the order of convergence. This research is theoretical research by reviewing relevant theories for solving nonlinear equation. The results of the research are Derivative Free Newton Type Method, algorithm of Derivative Free Newton Type Method, and this method has fifth order convergence. Keywords – Potra and Ptak Method, Taylor series, Derivative Free, Order of Convergence

PENERAPAN AUTOREGRESSIVE DISTRIBUSI LAG (ARDL) PADA PREDIKSI PRODUKSI KAKAO INDONESIA Lila Syafira; Helma Helma
Journal of Mathematics UNP Vol 7, No 3 (2022): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Cocoa is an important commodity for Indonesia. The area and production of cocoa during the last decade decreased by 0.39% and 0.41% per year, respectively. This study aims to find a model and predict Indonesian cocoa production. This study using Autoregressive Distributed Lag (ARDL) method. The ARDL model (1, 3, 2, 2) was obtained which was selected based on the smallest Akaike Integration Criteria (AIC) value. Based on the ARDL model, the estimated average production increases by 0.6684 tons for a decrease in production of 1 ton at t-1. The estimated average production increased by 0.6130 tons for an increase in plant area of 1 Ha at time t, an increase of 0.0257 tons for an increase in plant area to produce 1 Ha at t-1, an increase of 0.5043 tons for an increase in plant area produce 1 Ha at t-2, an increase of 0.3308 tons for an increase in plant area to produce 1 Ha at t-3. Likewise for the increase or decrease area of immature plants and damaged plants in the ARDL model can be interpreted in this way.

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

Prediksi Jumlah Ternak Ayam Ras Petelur Berdasarkan Keuntungan Hasil Produksi Menggunakan Metode Inverse Regression Classic Sonia Humaira; Helma Helma
Journal of Mathematics UNP Vol 5, No 1 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract–The business of purebreed chicken has a lot of defiance that become a disturbances of purebreed chicken bussines. The cost for production are higher than the livestock produce. This would results in tremendous loss for the farm owners. This problem can be explained by using the classic regression inverse method so that the profit of purebreed chicken can be maximized from the amount of the livestock which available. So the value of the can be predicted from the prediction model in the response variable. The purpose of this research is to formed two hose model prediction for the amount of the livestock of purebreed chicken based on production profits. This research uses primary data obtained from 15 purebreed chicken farms in Padang Pariaman Regency. The result of this research acquired the amount of livestock that must be provided depend on the benefits of production. Keywords– Purebreed chicken, Regression Forecasting, Inverse Regression Classic.

Faktor-Faktor yang Mencirikan Kondisi Financial Distress Pasca Kenaikan BBM Perusahaan Manufaktur di BEI Menggunakan Analisis Biplot Venny Oktarinda; Syafriandi Syafriandi; Nonong Amalita
Journal of Mathematics UNP Vol 2, No 1 (2014): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract Financial distress is situation where financial condition company in crisis. Prices increasis BBM is one of the external factors cause occurrence of financial distress. So that company can overcome problem of financial distress, it’s necessary know factors that characterize financial condition by financial ratios of manufacturing companies on Indonesian Stock Exchange before and after increase prices BBM using biplot analysis. Biplot results indicate that factors characterize company condition good company prior to the rise in fuel prices is value of CR, DER, and ROE above average and value TATO is below average. After the occurrence of condition of fuel price hike company declined to cash flow problems and deterioration. Company's cash flow problems on condition characterized by value of CR above average and of DER, TATO, and ROE is below average. Company on condition characterized by deterioration DER values were above average, value CR, TATO, and ROE is below average. Keywords financial distress, financial ratios, biplot analysis

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Defri Ahmad

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+6281374333545

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Jl. Prof. dr. Hamka Air Tawar Barat Padang

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Kota padang,

Sumatera barat

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

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Contact Name Defri Ahmad

Contact Email defri_math@fmipa.unp.ac.id

Phone +6281374333545

Journal Mail Official defri_math@fmipa.unp.ac.id

Editorial Address Jl. Prof. dr. Hamka Air Tawar Barat Padang

Location Kota padang, Sumatera barat INDONESIA

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Contact Name
Defri Ahmad

Contact Email
defri_math@fmipa.unp.ac.id

Phone
+6281374333545

Journal Mail Official
defri_math@fmipa.unp.ac.id

Editorial Address
Jl. Prof. dr. Hamka Air Tawar Barat Padang

Location
Kota padang,

Sumatera barat

INDONESIA