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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 15 Documents

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Search results for , issue "Vol 6, No 1 (2021): Journal Of Mathematics UNP" : 15 Documents clear

Faktor – faktor yang Mempengaruhi Persalinan Berdasarkan Umur Kehamilan dengan Menggunakan Analisis Regresi Logistik Melly Kurniawati; Media Rosha; Nonong Amalita
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Childbirth is a natural event experienced by a mother. Based on interviews in September 2015 were conducted in the mother house who have experienced childbirth said that the mother gave birth at 29 weeks gestational age infant’s organ is not mature enough, and the baby eventually died. The aim of this study was to determine the form of the logistic regression model, factors that significant and opportunity of the each factors that significantly affect childbirth based on gestational age. The results were obtained form the logistic regression model that describes the factors that affect childbirth based on gestational age. Who the significance factor are history of childbirth, anemia, and hypertension. Opportunity mother had a history of preterm childbirth, anemia, and hypertension the opportunity of the mother will experience premature childbirt is 0.999. Keywords: Childbirth, Logistic Regression, Probability

Optimasi Portofolio dengan Lexicographic Goal Programming pada Bursa Efek Indonesia Nilam Purnama Sari; Muhammad Subhan; Dewi Murni
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – A portfolio is a collection of investment opportunity that aims to select a combination of efficient of shares owned, in the form of profit (return) is optimal in forming the optimal portfolio, there are three criteria that must be considered, maximizing the total funds that, maximizing expected return, minimizing risk market (systematic risk coefficients). One model that can solve this problem is lexicographic goal programming. research purposes is how to obtain a stock portfolio optimation with lexicographic goal programming and the proportion of the funds invested. The method used is descriptive method that analyzes the theories related to lexicographic goal programming. The result obtained is an optimum portfolio.Keywords – investment, portfolio, return, the coefficient of systematic risk, lexicographic goal programming

Risiko Klaim Asuransi Jiwa Menggunakan Regresi Cox Disti Harlin; Minora Longgom Nasution; Yenni Kurniawati
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Life insurance is one of term for the transfer of risk. The main function of life insurance is as a transfer of risk from the insured to the insurer. Because that function, insurance company are required to determine the factors influencing and know the probability where at a certain time the insured will be many taking insurance claim. The right analysis for this problem is a cox regression model, because this analysis relates to someone survival situasion and the time as main factor. The result of this study indicate that the factors that affect the risk of insurance claim are factors sex and type of work. Opportunity risk of the insured event occurs by female is times than the insured event by male. Then the risk of the insured event occurs by outdoor times than the insured event by indoor.Keywords – Life Insurance, Klaim, Cox Regression.

Prediksi Peluang Perpindahan Merek Handphone Menggunakan Rantai Markov Di RW 03 Air Tawar Barat Padang Mamad Hardiyanto; Yerizon Yerizon; Dewi Murni
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract –Variety mobile phone brand on the market,gives a great probability on consumers to make mobile phone brand switching from one brand to another brand. Thus giving a challenge to the mobile phone companies to seek measures should be made to obtain or retain consumers. The purpose of this research was to know Markov chain model on the mobile phone brand switching in RW 03 Air Tawar Barat Padang and the probability handphone brand switching in the future.This type of research is applied research using Markov chain analysis. Based on the research results, obtained from the Markov chain models displacement mobile phone as seen in matrix P and consumer probability switching on several mobile phone brands in the future is the brand “Others” (23.68%), Nokia (21.05%), Samsung (17.21%), Blackberry (13.35%), iPhone (10.13%), Oppo (7.74%), and brand Advan (6.85%). Keywords – Markov Chain, Probability mobile phone brand switching.Abstract –Variety mobile phone brand on the market,gives a great probability on consumers to make mobile phone brand switching from one brand to another brand. Thus giving a challenge to the mobile phone companies to seek measures should be made to obtain or retain consumers. The purpose of this research was to know Markov chain model on the mobile phone brand switching in RW 03 Air Tawar Barat Padang and the probability handphone brand switching in the future.This type of research is applied research using Markov chain analysis. Based on the research results, obtained from the Markov chain models displacement mobile phone as seen in matrix P and consumer probability switching on several mobile phone brands in the future is the brand “Others” (23.68%), Nokia (21.05%), Samsung (17.21%), Blackberry (13.35%), iPhone (10.13%), Oppo (7.74%), and brand Advan (6.85%). Keywords – Markov Chain, Probability mobile phone brand switching.

Peramalan Jumlah Penumpang Kereta Api Indonesia (Persero) Divisi Regional II Sumatera Barat Menggunakan Metode ARIMA Tisa Revina Dewi; Helma Helma; Meira Parma Dewi
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – PT. Kereta Api Indonesia (Persero) Regional Division II West Sumatera is currently facing the problem of carrying capacity that doesn’t meet the increasing passenger capacity. Therefore, will be made forecasting the number of train passengers for the future, so that the PT. Kereta Api can prepare the necessary facilities. The purpose of this study was to obtain a forecasting model and forecast the number of train passengers starting from the month of August 2015 until July 2016. The methods used are ARIMA method. After going through the stage of model identification, assessment and testing parameters, as well as the diagnostic phase, the obtained ARIMA(0,1,1)(0,1,1)12 as a suitable model for predicting the number of railway passengers with the model Yt = 243,6 + Yt-1 + Yt-12 –Yt-13 + et – 0,7689 et-1 – 0,8271 et-12 + (0,7689 x 0,8271) et-13 .Keywords – PT. Kereta Api, The Number of Passengers, Forecasting, ARIMA MethodAbstract – PT. Kereta Api Indonesia (Persero) Regional Division II West Sumatera is currently facing the problem of carrying capacity that doesn’t meet the increasing passenger capacity. Therefore, will be made forecasting the number of train passengers for the future, so that the PT. Kereta Api can prepare the necessary facilities. The purpose of this study was to obtain a forecasting model and forecast the number of train passengers starting from the month of August 2015 until July 2016. The methods used are ARIMA method. After going through the stage of model identification, assessment and testing parameters, as well as the diagnostic phase, the obtained ARIMA(0,1,1)(0,1,1)12 as a suitable model for predicting the number of railway passengers with the model Yt = 243,6 + Yt-1 + Yt-12 –Yt-13 + et – 0,7689 et-1 – 0,8271 et-12 + (0,7689 x 0,8271) et-13 . Keywords – PT. Kereta Api, The Number of Passengers, Forecasting, ARIMA Method

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.

Faktor-Faktor yang Menyebabkan Obesitas Berisiko pada Mahasiswa Matematika FMIPA UNP Menggunakan Analisis Faktor Siska Novita Sari; Helma Helma; Muhammad Subhan
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract - Obesity is a disorder characterized by the accumulation of fat tissue in the body excessively. Obesity can happen to anyone, including students. Many impacts of diseases that can attack is coronary heart disease, diabetes mellitus, hypertension and other dangerous diseases. Objectives for the review identify factors causing obesity. This research is done student of studies program mathematics Faculty of Mathematics and Science (FMIPA) Department State University of Padang (UNP), data was collected through questionnaires deplopment with respondents as many 32 people were processed using factor analyze. From the analyze of the data can be obtained five new factors.Keywords - Factor analyze, Obesity, the impact of obesity diseaseAbstract-Obesity is a disorder characterized by the accumulation of fat tissue in the body excessively. Obesity can happen to anyone, including students. Many impacts of diseases that can attack is coronary heart disease, diabetes mellitus, hypertension and other dangerous diseases. Objectives for the review identify factors causing obesity. This research is done student of studies program mathematics Faculty of Mathematics and Science (FMIPA) Department State University of Padang (UNP),data was collected through questionnaires deplopment with respondents as many 32 people were processed using factor analyze. From the analyze of the data can be obtained five new factors. Keywords- Factor analyze, Obesity, the impact of obesity disease

Faktor-Faktor Risiko yang Mempengaruhi Kanker Paru-Paru dengan Menggunakan Analisis Regresi Logistik Juwita Juwita; Nonong Amalita; Meira Parma Dewi
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract – Lung cancer is a disease with characteristic presence of uncontrolled cell growth in the lung tissue. If not treated, the growth of these cells can spread beyond the lung. So if it is not taken seriously, will be ensured with lung cancer longer will increase. The factors that affect the risk of lung cancer are age, gender, cigarette consumption and lung disease history, family history, and type of work. To determine the factors that most influence the risk of lung cancer will be established a model which can help the application of a causal relationship between two or more variables by using logistic regression analysis. Which aims to determine the factors that influence and determine the chances of each of the factors that affect the risk of lung cancer. Based on theresults of the study, the factors that affect the risk of lung cancerat the Hospital Dr. M. Djamil Padang is age cigarette consumption and lung disease history. If a personolder than 40 years, smokers and have a history of lung disease, the chances that a person will suffer from lung cancer increases.Keywords–lung cancer, risk factor, logistic regression analysis

Menentukan Luas Daerah Segitiga Spheris Mulyadi Mulyadi; Mirna Mirna; Riry Sriningsih
Journal of Mathematics UNP Vol 6, No 1 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract - Spherical Triangle is a triangle on surface of ball that formed by circles which cutting the ball. The circle that forms a Spherical Triangle are circles which cutting the ball in center. Area of Spherical Triangle is different from Euclid Triangle. This study look at how to find the Area of Spherical Triangle. The result obtained in this study is how to find the area of Spherical Triangle that must knows about dihedral angle or trihedral angle that forms spherical triangle.Keywords - spherical triangle, dihedral angle, trihedral angle.

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

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Defri Ahmad

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defri_math@fmipa.unp.ac.id

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+6281374333545

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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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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

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Abstract

Abstract

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Abstract

Abstract

Abstract

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