Article Per Year (5 Year)
p-Index From 2021 - 2026
1.512
P-Index
This Author published in this journals
All Journal Jurnal Matematika JURNAL ILMIAH MATEMATIKA DAN TERAPAN BAREKENG: Jurnal Ilmu Matematika dan Terapan JURNAL EKSAKTA PENDIDIKAN (JEP) MATHunesa: Jurnal Ilmiah Matematika Journal of Mathematics UNP Jurnal Pendidikan Matematika
Ahmad, Defri
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Mathematics Mechanical Engineering Physics Transportation Other

Published : 11 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search
Journal : Journal of Mathematics UNP

 1 
Optimasi Perencanaan Menu Diet Bagi Penderita Penyakit Asam Urat Menggunakan Weighted Goal Programming Fadhilla, Aisya; 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.v9i1.14002

Abstract

A low-purine diet is recommended for gout patients. The goal of this diet are to achieve and maintain normal nutritional status while also lowering uric acid levels in the blood. This study aims to manage the menu of a low-purine diet in order to minimize the deviations of energy, proteins, fats, and carbohydrates using the weighted goal programming method. The study was started by formulating the models and planning a diet menu using the weighted goal programming method. The results showed that the food portions of the low-purine diet menu planning using the weighted goal programming method could fulfill the target of the patient's total daily energy needs.
Algoritma Penyelesaian Sistem Persamaan Linear Fuzzy Dan Implementasinya Pada Bahasa C++ Syahnur, Muslim; 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.v9i1.15047

Abstract

A system of fuzzy linear equations is a linear equation with more than one number that is related to one another where the constants and variables are in the form of fuzzy numbers. To solve it, the system of fuzzy linear equations is changed to a system of non-fuzzy linear equations and the solution uses codeblock program software to get fast and accurate results. In solving the system of fuzzy linear equations in this study, the Crout decomposition method was applied and developed an algorithm to be applied to the C++ language. Crout's decomposition method is to decompose a matrix into a multiplication matrix ???????? where the matrix ???? (Lower) is the lower triangular matrix and the matrix ???? (Upper) is the upper triangular matrix whose main diagonal has a value of one. The results of the research are in the form of programs that can find solutions to systems of fuzzy linear equations that have fulfilled the complexity of the function.
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.  
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.
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

Co-Authors Fadhilla, Aisya Firdaus, Liony Putri Fridgo Tasman Marliza, Syafina Putri Putri, Ariana Putri, Sovia Helmi Rara Sandhy Winanda Shabrina, Nanda Sriwirdani, Aisyah Susriyanti, Mella Syahnur, Muslim Yeni, Tiya Enggri Zainal, Zakiah