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All Journal Jurnal Matematika Jurnal Ilmiah Poli Bisnis
Devi Larasati
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Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Mathematics

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ANALISIS MODEL MATEMATIKA UNTUK PENYEBARAN VIRUS HEPATITIS B (HBV) Devi Larasati; Redemtus Heru Tjahjana
Jurnal Matematika Vol 1, No 1 (2012): jurnal matematika
Publisher : MATEMATIKA FSM, UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.411 KB)

Abstract

Infeksi Virus Hepatitis B (HBV) dapat dimodelkan dengan menggunakan model Suspected, Infected, dan Recovered (SIR). Persamaan-persamaan pada model merupakan sistem persamaan diferensial nonliner orde satu dengan tiga variabel.  Dari model SIR didapat 2 titik kesetimbangan yaitu titik kesetimbangan bebas penyakit dan titik kesetimbangan endemik virus. Rasio reproduksi dasar didapat dari dua titik kesetimbangan, yang berguna untuk mengukur tingkat penyebaran virus. Untuk menganalisis kestabilan digunakan nilai Eigen dari matriks Jacobian dan Kriteria Routh-Hurwitz. Dari analisis kestabilan diketahui titik kesetimbangan bebas penyakit stabil jika R0<1 dan titik kesetimbangan endemik virus stabil jika R0>1 .
Pengaruh Sosial, Pribadi, & Psikologi terhadap Keputusan Pembelian di Shopee dengan Penipuan sebagai Variabel Moderasi Larasati, Devi
Jurnal Ilmiah Poli Bisnis Vol 14 No 2 (2022): Volume 14 Nomor 2
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jipb.v14i2.833

Abstract

This study aims to determine the effect of social, personal, and psychological factors on purchasing decisions at Shopee with fraud as a moderating variable. This study uses a quantitative approach. With the SEM-PLS research method using the SmartPLS 3.0 software. In this study, the population was the management study program students of the University of Muhammadiyah Gresik batch 2018 with a sample of 137 respondents. The sampling technique used a purposive sampling method. This study uses primary data that contains respondents' answers to questionnaires that have been distributed via google form. The results show that: 1) Social factors have a positive and significant effect on purchasing decisions at Shopee, 2) Personal factors have no significant effect on purchasing decisions at Shopee, 3) Psychological factors have a positive and significant effect on purchasing decisions at Shopee, 4) Fraud can be a moderating variable and weaken social factors on purchasing decisions, 5) Fraud is not able to be a moderating variable for personal factors in purchasing decisions, 6) Fraud is not able to be a moderating variable for psychological factors in purchasing decisions.
Co-Authors Redemtus Heru Tjahjana