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Journal of Mathematics UNP
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 20 Documents
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Search results for , issue "Vol 8, No 4 (2023): Journal Of Mathematics UNP" : 20 Documents clear
Statistical Quality Control pada Produk Air Minum dalam Kemasan Merek X di CV XYZ Diantami, Melati; Rosha, Media
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14454

Abstract

Bottled water is one alternative that can be used to meet the clean water needs in society. X brand of bottled water is one of the brands circulating in West Sumatra. Based on the quality requirements of SNI 01-3553-2015, pH and the amound of dissolved subtances are some aspects that can cause some diseases if they do not meet the set standards. In addition, the volume of water in each package must be in accordance with what is stated on the package. This study aims to determine the quality of bottled water products using the  and  control charts in statistical quality control. The research sample was obtained from CV XYZ in Padang. The research instrument used measurement tools such as measuring glasses, dropper, digital pH meter and TDS meters. The results showed that all variables were not controlled based on the  and  control charts.
Faktor-Faktor Yang Mempengaruhi Angka Gizi Buruk Pada Balita Di Sumatera Barat Menggunakan Metode All Possible Regression Dari Regresi Linier Putri, Nurlailatika; Helma, Helma
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14919

Abstract

Currently in Indonesia., health problems are in the spotlight is the high mortality rate in children aged 0-59 month. This problem is caused by malnutrition thar occurs in children in this age group. Solving the problem of malnutrition is a serious challenge in West Sumatra Province which is influenced by various factors that play a role in the problem. This research aims to .determine what are the causes of malnutrition in the West Sumatra region. The approach used is the All Possible Regression method of linear regression, taking into account .factors such as toddlers with low birth weight (x1), exclusive breastfeeding (x2), vitamin A suplemetation (x3), and antenatal visits to pregnant women (x4). According to the research results, a multiple linear regression model has been obtained to identify factors that have an influence on malnutrition rates in toddlesr  in West Sumatra as follows: y = 3,95 - 0,0406 x4So, antenatal visits to pregnant women (x4) have a significant effect on the incidence malnutrition in toddlers in West Sumatra with a level of error 5%.
Model Regresi Multivariat pada Tingkat Kesejahteraan Masyarakat di Sumatera Barat Zain, Wardinatul; Murni, Dewi
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14305

Abstract

Peramalan Jumlah Produksi Bawang Merah Provinsi Sumatera Barat Menggunakan Metode Triple Exponential Smoothing Tipe Brown Rahmadani, Suci; Helma, Helma
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.15339

Abstract

Onion (Allium Ascalonicum L) is an important food ingredient that is widely used by the community and has a high market value. The increase in population in West Sumatra province every year has an impact on the need for onion. The amount of onion consumption is greater than the amount of production which causes unmet community needs for onion. This study aims to model onion production forecasts using the Brown Type Triple Exponential Smoothing technique and estimate onion production in West Sumatra province from  based on the model that has been obtained. The smoothing parameter is , which is used in the quantitative forecasting process known as the Brown Type Triple Exponential Smoothing technique. After the data is analyzed and processed, it can be concluded that the results of the onion production forecast for 2023 to 2027 are 242.872,32 ton, 275.231,24 ton, 309.726 ton, 346.356,60 ton and 385.123,04 ton respectively. 
Analisis Pengukuran Kinerja Portofolio Optimal Pada Indeks LQ-45 dengan Model Korelasi Konstan Putri, Riris Frishania; Helma, Helma
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14505

Abstract

An investment is putting in funds with the goal that it will generate a result in the future. In making investment decisions, investors are inseperable from the consideration of return-risk. The higher return from investors then making the higher risk that will be faced. Therefore, to minimized risk and maximized return, it is necessary to do portfolio analysis. The purpose research is to create an optimal portfolio and measure of performance of the optimal portfolio on LQ-45 index stocks. The results obtained indicate that portfolio A is the optimal of portfolio. The proportion of stocks included in the optimal portfolio are ITMG (68.2%) and MEDC (31.8%) with the expected return from optimal portfolio being 0.33% while the risk is 0.0229. Measuring the performance of each portfolio in a row is portfolio A of 0.093, portfolio B of 0.031, and portfolio C of 0.067. Performance measurement analysis on the optimal portfolio shows that portfolio A has superior performance compared to other portfolios.
The Comparison of the Regula-Falsi Method and the Ridder Method in Determining Non Linear Equation Roots Melrosa, Feby
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14931

Abstract

As the development of technology, there are many problems in mathematics that required a structured solutions, one of which is finding a solution to a non-linear equation called a root equation. This solution can be solved numerically when an analytical solution is difficult to find. Numerical methods that can be used to find roots of nonlinear equations include the Regula-Falsi method and the Ridder method.  The purpose of this research is compare the results in the form of root value comparison, the number of iterations and the error rate from the Regula Falsi method and the Ridder method. Based on the research findings, it can be concluded that the root values obtained from the Regula Falsi method and the Ridder method are the same. However, for some equations, the Ridder method is preferable and constantly gets fewer iterations compared to the Regula Falsi method.
Model Epidemi Penyebaran Ujaran Kebencian di Twitter Putri, Anjeli; Subhan, Muhammad
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14349

Abstract

Optimasi Hasil Produksi Keranjang Rotan Menggunakan Metode Karush-Kuhn-Tucker (Studi Kasus Rumahan Keranjang Rotan di Desa Buluh Rampai Belasandi, Belasandi; Arnelis, Arnelis
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.15168

Abstract

Optimization aims to obtain extreme values, either maximizing or minimizing a certain function with its limiting factors. This research was conducted in the rattan basket home industry of Buluh Rampai village by taking secondary data. To find out production results and maximum profits based on the availability of raw materials, time, labor and production capital, we use the Karush-Kuhn-Tucker method. This method can determine the optimum value of a constraint function without looking at its linear or nonlinear properties. This method is a development of the Lagrange method with matrix multiplication using the Matlab application. Based on the results of research using the Karush-Kuhn-Tucker method, it was found that the number of weighing rattan baskets produced was 116, 225 small round rattan baskets, 360 large round rattan baskets, and 77 ambungs with a maximum profit of IDR 41,985,313.
Peramalan Jumlah Permintaan Tepung Terigu pada Bahan Baku Roti Menggunakan Metode Triple Exponential Smoothing Brown di Usaha Roti Anggun Farhati, Nia Awra; Murni, Dewi
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.14558

Abstract

Wheat flour is the main raw material in making bread. The amount of demand for wheat flour at Usaha Roti Anggun comes from distributors which will affect the amount of bread production. The purpose of this study is to form a forecasting model for the amount of demand for wheat flour in bread raw materials at Roti Anggun Business using the Brown type triple exponential smoothing method and forecast the amount of demand for wheat flour based on the model formed. The forecasting method used is Brown's Triple Exponential Smoothing with the parameter α which minimizes the MSE is 0.42. The results of forecasting the total demand for wheat flour at Usaha Roti Anggun with the equation model
Mathematical Model of the Effect of Growth Hormone In Glucose Homeostasis Restu, Syaputri Dwi
Journal of Mathematics UNP Vol 8, No 4 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i4.10934

Abstract

Homeostasis is a state in the body of a living being that maintains the concentration of substances in the body. One of the substances in the body that is important to maintain is glucose. Glucose is the main source of energy for body work, which comes from the food consumed by the body. Glucose homeostasis is a condition that maintains or maintains the glucose concentration in the living body to remain stable / constant. This study aims to form a mathematical model that can describe the influence of growth hormone on glucose homeostasis. The model obtained is in the form of a system of differential equations consisting of six equations and three fixed points. The analysis results show that the pathological fixed point (P0) and the physiological fixed point (P1) is stable, while the pre-diabetic fixed point / physiological to pathological (P2) is unstable. 

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