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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 404 Documents
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Analisis Kestabilan Model Matematika Dinamika Penyebaran Rumor melalui Media Sosial dan Verbal Fauziah, Helena; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 9, No 2 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i2.15703

Abstract

Rumor, unverified information, propagate swiftly through word of mouth and social media. This research will discuss a mathematical model of the dynamics of rumor spreading through social media and verbal with four compartments, namely I, M, G and R. This is referred to a basic research (theoretical) using descriptive method. The results of this research indicate that the rumor-free equilibrium point is asymptotically stable if it satisfies the conditions, meaning that no rumor spreads in the population; the rumor-endemic equilibrium point through verbal is asymptotically stable if it satisfies the conditions, meaning that rumors spread but only through verbal in the population; and the rumor-endemic equilibrium point through media is asymptotically stable if it satisfies the conditions, meaning that rumors spread but only through media in the population.
Model matematika kecanduan lem aibon pada anak jalanan dengan faktor edukasi dan treatment Yeni, Tiya Enggri; Ahmad, Defri
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.14016

Abstract

Abuse of aibon glue will cause addictive behavior because there is substance lysergic acid diethyilamide in the glue. The level of spread of Aibon glue addiction depends on educational factors and the tratment given. This study aims to establish, analyze and interpret the results of the analysis of the mathematical model of Aibon glue addiction in street children with education and treatment faktors. This research includes basic research using descriptive methods. The mathematical model formed is the SEIR model. Based on the analysis that has been carried out, two fixed points are obtained, namely the disease-free fixed point and the endemic fixed point. Disease-free fixed point is asymptotically stable if  Whereas for an endemic fixed point it will be asymtotically stable if it meets the requirement obtained from the Routh-Hurwitz criteria. The greater the education given, the more educated the population will be. Whereas when the treatment is getting bigger, the infected population decreases.  
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.
Pemodelan Sistem Antrian Multiserver di Kantor Samsat Kota Padang berdasarkan Aspiration Level Putri, Anisa Dianda; Rosha, Media
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.15066

Abstract

Queues in everyday life are very common. Situations like this are often found in public service facilities, one of which is the Padang City SAMSAT Office. The research objective was tovdetermine the optimal queuing system model based on the aspiration level. This researchvisvan applied research withvprimary datavtypes. Thevdata analysisvtechnique usedvisvcalculating the average time between arrivals and the average service time, testing the suitability of the distribution with the Kolmogorov Smirnov test, then analyzed using the queuing model. The results showed that based on the aspiration level, the optimal queuing system model on Mondays, Wednesdays, Thursdays and Fridays at the Padang City SAMSAT Office was (M/M/9):(GD/∞/∞). The results of thevaspiration level decisions on Monday, Wednesday, Thursday and Friday with thevadditionvofvthe numbervofvofficersvto 10 people show that the percentage of unemployed officers is 18.5% of their working time and the average time taxpayers wait in the system is approximately 25.58 minutes.
Preferensi Mahasiswa FMIPA Dan FT UNP Terhadap Rumah Kos dengan Menggunakan Analisis Konjoin Dini, Rahmi; Subhan, Muhammad
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.15163

Abstract

Out-of-town college students definitely need a place to live. Looking at the boarding house that will be lived in can help determine the right choice for students. This study aims to identify factors that influence student preferences in choosing boarding houses. This research is a survey research using primary data collected directly from students of the Faculty of Mathematics and Natural Sciences and the Faculty of Engineering, Padang State University using questionnaires. Data analysis techniques in this study use conjoint analysis techniques. The steps used are problem formulation, structuring stimuli, forming input data, selection of conjoint analysis procedures, interpretation of results.  Based on the data analysis that has been done, the preferred combination of students of the Faculty of Mathematics and Natural Sciences and the Faculty of Engineering, Padang State University in choosing a boarding house is a rental price of Rp. 250,000 – Rp. 550,000, with a distance of less than 1 km from the campus, there are cleaning managers and boarding house guards, boarding houses that have rooms with good air circulation, there are windows,  comfortableand clean. Has complete facilities, with 1 occupant per room.
Analisis Regresi Linear Berganda dalam Menentukan Pengaruh Kinerja Keuangan terhadap Harga Saham Perusahaan LQ-45 di Bursa Efek Indonesia Khatimah, Havifah Husnatul; Helma, Helma
Journal of Mathematics UNP Vol 9, No 2 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i2.12910

Abstract

The stock price is the value formed by the negotiation between sellers and buyers on the stock exchange. Uncertainty in forecasting stock prices is a problem for investors because stock prices are always fluctuating. One of the internal factors affecting stock prices is financial performance. The aim of this research is to create a multiple linear regression model of the factors influencing stock prices and to identify the factors that significantly affect stock prices in LQ-45 companies on the Indonesia Stock Exchange. The analysis used is multiple linear regression analysis. The multiple linear regression model that describes the factors influencing stock prices in LQ-45 companies on the Indonesia Stock Exchange is: ???? = 7.391 + 0.01004 ????1+ 0.000901 ????2 + 0.01351 ????4.Based on the research, it was found that the factors significantly affecting stock prices in LQ-45 companies on the Indonesia Stock Exchange are Price to Earnings Ratio (x1), Earnings per Share (x2 ), and Return on Equity (x4 ) with an error rate of 5%.Keywords: Multiple Linear Regression, Stock Price, Financial Performance
MODEL MATEMATIKA PENYEBARAN PENYAKIT ANTRAKNOSA PADA TANAMAN CABE DENGAN TINDAKAN PREVENTIF DAN KURATIF Susriyanti, Mella; Ahmad, Defri
Journal of Mathematics UNP Vol 9, No 2 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i2.14055

Abstract

A disease that can affect chili plants is anthracnose. This disease can cause crop loss. The level of spread of this disease depends on control efforts, starting from preventive and moving to curative efforts. The purpose of this study was to form a model, analyse it, and interpret the result of a mathematical model analysis of the spread of anthracnose disease in chilies with preventive and curative measures. This type of research is basic research, and the method used is the descriptive method. The mathematical model formed is the SIRPC model.  The SIRPC model is the resultant mathematical model. Two balance point the illness free balance point and the endemic balance point are discovered as a result of the study that has been done. the illness free balance point and the endemic balance point obtained are asymptotically stable. The greater the preventive action, the more the protected population increases and the vulnerable population decreases, while when the curative action is greater, the infected and carrier populations decrease.
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 Matematika Kecanduan Gadget pada Remaja Menggunakan Manajemen Waktu Zainal, Zakiah; Ahmad, Defri
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.14335

Abstract

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

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