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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 3 (2021): Journal Of Mathematics UNP" : 15 Documents clear

ANALISIS CLUSTER COVID-19 DI SUMATERA BARAT DENGAN METODE NON-HIRARKI (K-MEANS) Afridho Afnanda; Arnellis Arnellis
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

COVID-19 has spread and has become a pandemic in almost all of the world, including in Indonesia. In Indonesia, this virus was first announced on March 2, 2020, until March 14 to 27, 2020, a total of 77,261 cases were identified. In an effort to stop the spread of COVID-19, the Indonesian government has made several policies that are expected to suppress the spread of this virus. Cluster analysis is a technical class, used to classify objects or cases into relatively homogeneous (same) groups called clusters. The type of data used is secondary data on COVID-19 in districts/cities of West Sumatra Province obtained from the West Sumatra Provincial Health Office and the COVID-19 task force website, where the data obtained is cumulative data from March 2020 to July 14, 2021. Optimization the number of K clusters using the elbow method to produce K=3, the results of the K-means cluster analysis with the number of K=3 concluded that the distance of members in the cluster is low and the distance between clusters is large

Peramalan Jumlah Produksi Kerupuk Kamang Berdasarkan Keuntungan Hasil Produksi Menggunakan Analisis Regresi Invers dengan Metode Klasik yulistia rahmadani; Helma Helma
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

The limitation of kamang cracker businessmenin marketing their products is the main factor that makes businessmenunable to maximizethe profits of theirproduction. To maximize profits, a method is needed to predict the number of kamang crackers that must be produced based on the profits obtained. In this case, regression analysis with classical method can be used wherethe value of x0 can be predicted based on the dependent variable y0. The purpose of this study is to create a model and determine the prediction interval from forecasting the numberofkamang cracker production based on the profit obtained from the production. The data used are primary data obtained from 25 business houses inKecamatanKamang Magek . From the prediction results obtained, it can be interpretationthe number of kamangcrackers that must be produced

ANALISIS MULTIDIMENSIONAL SCALING DAN PENERAPANNYA PADA PEMETAAN KAB/KOTA DI PROVINSI SUMATERA BARAT BERDASARKAN JUMLAH PENDUDUK USIA KERJA TERDAMPAK COVID-19 Dewi Safitri; Arnellis Arnellis
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

The COVID-19 pandemic became an epidemic throughout the country at the end of 2019 until now. The impact is not only on the health sector but also on the employment sector in Indonesia, one of which is West Sumatra. The perceived impacts include unemployment, temporary absence from work and a reducing working hours. This impact makes the economy of the community decline. The purpose of this research is to see how the districts/cities in the province of West Sumatra are mapped/grouped based on the number of working age residents affected by COVID-19 using multidimensional scaling analysis. So later it can be used as a reference for the government in the future. From the results of the mapping, three groups were formed. The largest number of working age residents affected by COVID-19 was Padang City, followed by Agam districts. With a stress value of 0.25% and R2 of 0,999 it shows that the multidimensional scaling analysis map obtained is acceptable.

Face Recognition Menggunakan Algoritma Haar Cascade Classifier Dan Convolutional Neural Network Bella Hartika; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Face recognition is a biometric technology that is widely used in the era of the industrial revolution 4.0 such as smart home, security and presence. In the application of face recognition, a method is needed that can perform facial recognition quickly andwith a high level of accuracy. This study aims to determine the level of accuracy and computation time of the Haar Cascade Classifier Algorithm and Convolutional Neural Network in Face Recognition with the mechine learning method. Determining the level ofaccuracy is done by calculating the amount of facial data that can be recognized from the overall face data. Calculating the computational time is done by calculating the time required during the facial recognition process by the computational process. The process of determining the level and time of computing is carried out by the python computing program using the numpy and tensorflow libraries. Based on the analysis carried out by the face detection process using the Haar Cascade Algorithm and Convolutional Neural Network, the program accuracy is 98.84% and the average time needed to recognize faces is 0.05s

Penentuan Premi Tunggal Asuransi Jiwa Dwiguna Unit Link dengan Garansi Minimum Menggunakan Metode Annual Ratchet dan Model Black Scholes SHELLA RIZKY AMALIA; Muhammad Subhan
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Unit-linked Endowment life insurance is a Endowment life insurance that combines the benefits of insurance and investment. In determining the unit-linked Endowment life insurance premium, it is necessary to have a minimum guarantee value to overcome the risk of loss for the policyholder. The method that can be used is the Annual Ratchet method and the Black Scholes Model. The data used in this study is the daily closing stock data of PT. Astra Internasional and Bank Indonesia interest rates in January 2020. Life probability data is based on the 2019 Mortality Table. The results obtained in this study are single premium net Endowment unit-linked life insurance using the Annual Ratchet method and the Black Scholes model. Based on the case study, it is concluded that the premium for unit-linked dual-purpose life insurance with the Black-Scholes model is greater than the premium for the annual ratchet method.

Strategi Kompetisi Antara Tokopedia Dan Shopee Menggunakan Teori Permainan Defrisa Yoga Putra; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

TEMASEK is a company from Singapore. Based on research initiated by TEMASEKand Google in 2015,internet users in Indonesia reached 92 million. 18 million of them are e-commerce connoisseurs and it is predicted that by 2025 there will be 119 million onIineshoppers in Indonesia. This increase will push the e-commerce market value to reach 81billionin 2025. This has resulted in many e-commerce popping up in Indonesia, the top two being Tokopedia and Shopee. Therefore, managers are required to determine what strategies will hook consumers. Game theory is used to find the optimaIstrategy for each pIayer.The purpose of study is to find the optimaIvaIue of the game.This study uses 5 marketing strategies, namely promotion/advertising, completeness, service, payment, and price. The population in this study is Mathematics Students from January to June 2021, the sample of this research is Mathematics students at Padang State University who have used Tokopedia and Shopee.There are two methods of solving, namely using a pure strategy or a mixed strategy.In this case, the settlement uses a pure strategy and theoptimaI vaIue of the game is 0,04 where Tokopedia comes out as the winner with a maximum profit that will be obtained which is 4% if using a price strategy, while Shopee will minimize losses with its strategy, namely a more diverse payment strategy

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.

ANALISIS MATERIAL REQUIREMENT PLANNING DENGAN METODE ECONOMIC ORDER QUANTITY DAN PERIOD ORDER QUANTITY (Studi Kasus : Coffee Shop Bacarito Kopi Padang ) Abdillah Janaki Daosti; Defri Ahmad
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Inventory control and planning is one of the important things to carry out production activities. To get optimal inventory control, it can be done by using lot sizing technique with Eqonomic Order Quantity and Period Order Quantity methods. The purpose of this article is to minimize inventory costs by comparing the Eqonomic Order Quantity and Period Order Quantity-based lot sizing methods based on Material Requirement Planning to obtain minimal inventory costs at the Bacarito Kopi Padang coffee shop. The Bacarito Kopi Padang coffee shop is one of the SME coffee shops that still controls inventory using conventional methods that have not yielded maximum results. This research is an applied research and the data used are data on ordering costs, storage costs, large requests and the company's Total Inventory Cost. The total value of Total Inventory Cost (TIC) which is the minimum optimal is 23,3% for coffee type raw material, 13,5% for full cream milk raw material, 31,5% for syrup type raw material and 49.1% for raw material type sweetened condensed milk by 26,2%.

Analisis Bahasa Pemrograman Java dengan Bahasa Pemrograman Visual Basic Program Aplikasi Perkalian Matriks Fajar Shodik; Arnellis Arnellis
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

The rapid development of Information Technology today brings ease of work in variousfields, such as mathematics. Complex calculations can be completed easily and quickly just by using acalculator. Calculations can also be done using an application program, where the application isdeveloped using a programming language. Of the many programming languages that exist today,including Java and VisualBasic. This research is a basic research where in this study an analysis of the programming language with matrix multiplication problems is carried out.The purpose oft his research is to see which programming language is better based on predetermined criteria. The research methodused is by analyzing the algorithms of the two programming languages with matrix multiplicationproblems based on relevant sources. The results showed that the Visual Basic is better than the Java based on these criteria.

Pemodelan Matematika SITRS Penyebaran Pengguna Narkoba dengan Treatment Fathiya Putri Dayustin; Media Rosha
Journal of Mathematics UNP Vol 6, No 3 (2021): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract－Drugs are compounds that can affect the brain's functioning system. To slow the spread of drug users, which continues to rise, holistic treatment is used. The goal of this study was to determine the form of the SITRS mathematical model of drug user distribution by treatment and to interpret the results of the analysis of the SITRS mathematical model on drug user distribution by treatment. This is a fundamental or theoretical study. The human population is divided into four population groups in the development of a mathematical model: susceptible, infected, treatment, and removed. According to the model analysis, there are one equilibrium point free of drug users and one endemic equilibrium point with treatment for drug users. The stability analysis of the system resulted in a basic reproduction ratio of 0,1751824818 for the equilibrium point free and 4,61528461 for the endemic equilibrium point. Stability using eigenvalue criteria. The results obtained by each individual who becomes a drug user when receiving treatment on a regular basis can help to reduce the spread of drug users.

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Defri Ahmad

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Jl. Prof. dr. Hamka Air Tawar Barat Padang

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Phone +6281374333545

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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