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Studi Numerik Model Virus Hepatitis B dengan Pengaruh Penyembuhan dan Absorpsi Sari, Lisa Risfana; Andayani, Puji
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol 16, No 1 (2019): SAINMATIKA
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

The phenomenon of Hepatitis B outbreak almost occurs in all developing countries including Indonesia. Hepatitis B infection can develop into acute or chronic. In the chronic stage, the infection can cause liver complications such as liver cirrhosis or liver cancer or even death. Mathematical modeling have been widely used to study the Hepatitis B virus infection. In this study a mathematical model is constructed by considering non-cytolytic immune response and pathogen absorption. The model is analyzed by determining the equilibrium point of the model, determining the existence of the equilibrium point, and analyzing the stability of the equilibrium point of the model with numerical simulation. In this case, numerical analysis is used to illustrate the conditions of infection-free and infected. Furthermore, the relation of the stability requirements of each equilibrium point is studied. The results show that there are two equilibrium points, uninfected and infected equilibrium point. Both of the uninfected equilibrium point and infected equilibrium point is asymptotically stable if a certain condition are met. Based on these results, the causes of a persistent infection are studied.

Studi Numerik Model Virus Hepatitis B dengan Pengaruh Penyembuhan dan Absorpsi Lisa Risfana Sari; Puji Andayani
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 16 No. 1 (2019): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

The phenomenon of Hepatitis B outbreak almost occurs in all developing countries including Indonesia. Hepatitis B infection can develop into acute or chronic. In the chronic stage, the infection can cause liver complications such as liver cirrhosis or liver cancer or even death. Mathematical modeling have been widely used to study the Hepatitis B virus infection. In this study a mathematical model is constructed by considering non-cytolytic immune response and pathogen absorption. The model is analyzed by determining the equilibrium point of the model, determining the existence of the equilibrium point, and analyzing the stability of the equilibrium point of the model with numerical simulation. In this case, numerical analysis is used to illustrate the conditions of infection-free and infected. Furthermore, the relation of the stability requirements of each equilibrium point is studied. The results show that there are two equilibrium points, uninfected and infected equilibrium point. Both of the uninfected equilibrium point and infected equilibrium point is asymptotically stable if a certain condition are met. Based on these results, the causes of a persistent infection are studied.

Model Matematika Infeksi Virus Hepatitis B dengan Adsorpsi Lisa Risfana Sari
Jurnal Matematika Integratif Vol 13, No 2: Oktober, 2017
Publisher : Department of Matematics, Universitas Padjadjaran

Infeksi Hepatitis B terus berlanjut menjadi masalah kesehatan global. Termotivasi hal tersebut, kami memperkenalkan model matematika infeksi virus Hepatitis B (VHB). Berangkat dari fakta bahwa hukum mass-action tidak selalu benar dalam menggambarkan interaksi virus dengan sel rentan di kehidupan nyata, maka kami menggunakan tingkat infeksi standar pada model. Fase adsorpsi dalam proses infeksi virus dipertimbangkan dalam model sebagai salah satu penyebab penurunan populasi partikel virus. Pada model, populasi partikel virus dibagi menjadi dua kompartemen yaitu, virion dan kapsid intraseluler yang mengandung DNA-VHB. Populasi sel dibagi menjadi dua kompartemen yaitu, sel rentan dan sel terinfeksi. Perilaku dinamik model dianalisis dengan menentukan titikkesetimbangan bebas infeksi dan endemik, bilangan reproduksi dasar, serta kestabilan dari titik kesetimbangan tersebut. Hasil analisis dan simulasi menunjukkan bahwa stabilitas titik kesetimbangan bebas infeksi maupun endemik bergantung pada bilangan reproduksi dasar.

Pendampingan Manajemen Keuangan di UMKM Bengkel Hati, Kelurahan Gending, Kabupaten Gresik Noviasri, Rizky; Perwitasari, Astri Wening; Sari, Lisa Risfana; Hidayah, Lailatul
Jurnal Abdidas Vol. 4 No. 6 (2023): December, Pages 457 - 580
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/abdidas.v4i6.851

Kegiatan pengabdian kepada masyarakat ini dilakukan melalui kolaborasi dengan UMKM Bengkel Hati, yang berlokasi di Kelurahan Gending, Kabupaten Gresik. UMKM ini dikelola secara bersama-sama oleh ibu-ibu yang berada di kelurahan Gending. UMKM ini menjalankan usahanya dengan memanfaatkan lahan yang disediakan di Kantor Kelurahan Gending dan menggunakan sebuah kios yang merupakan bantuan dari Dinas Tenaga Kerja Gresik. Jenis usaha yang diadopsi UMKM ini usaha reseller makanan dan minuman hasil produksi warga sekitar. Produk yang dijual kios UMKM ini mulai dari minuman bunga telang, aneka keripik, kue-kue basah, nasi kotak, hingga aneka makanan instan. Permasalahan yang dialami UMKM adalah pencatatan keungan yang belum terorganisir. Beberapa kali selisih jumlah uang yang diterima dan yang dicatat sehingga proses bisnisnya terganggu. Dalam hal ini, konsep reseller menuntut UMKM untuk memiliki catatan keuangan yang baik. Tahapan pengabdian masyarakat ini dibagi menjadi tahap pra pengabdian dan pelaksanaan pengabdian. Pada tahap pra pengadian dilakukan survey awal untuk mengetahui kondisi dan permasalahan UMKM. Kemudian pada tahap pelaksanaan pengabdian dilakukan: (1) penyusunan modul dan rancangan buku catatan keuangan untuk UMKM; (2) pelatihan dan serah terima buku catatan keuangan; (3) Evaluasi. Didapati bahwa kegiatan pengabdian relevan dengan permasalahan yang dihadapi UMKM, bermanfaat dan membantu menyelesaikan permasalahan utamanya pencatatan keuangan, serta bisa dilanjutkan ke kegiatan-kegiatan pengembangan lainnya.

Nasi Babat Pegirian Surabaya Laris: Apakah karena Kualitas Produk atau Online Customer Review? Reffli Azriel, Harista; Perwitasari, Astri Wening; Sari, Lisa Risfana; Wardhana, Aditya Narendra
PENG: Jurnal Ekonomi dan Manajemen Vol. 2 No. 3 (2025): September: Education, Economic dan Social Studies
Publisher : Teewan Journal Solutions

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62710/xzabje97

This research aims to examine the influence of product quality and online customer reviews (OCR) on social media on purchasing decisions for Nasi Babat Pegirian Surabaya. This research is quantitative research using purposive sampling techniques. We collected the data using a questionnaire assisted by Google Forms. This research received 121 responses from Nasi Babat Pegirian Surabaya consumers with the criteria of having previously purchased Nasi Babat Pegirian Surabaya and having seen online reviews about Nasi Babat Pegirian Surabaya on social media. The data analysis methods used are multiple linear regression analysis consisting of t test, F test and coefficient of determination test. The results of the t test show that product quality variables partially do not influence purchasing decisions and online customer reviews partially influence purchasing decisions. The results of the F test show that product quality and online customer reviews simultaneously influence purchasing decisions with a coefficient of determination of 58%.

Comparing Vector-host and SEIR models for Zika Virus Transmission Andayani, Puji; Azmi, Rizal Dian; Sari, Lisa Risfana
The Journal of Experimental Life Science Vol. 8 No. 3 (2018)
Publisher : Graduate School, Universitas Brawijaya

Some mathematical models to describe Zika virus transmissions have been analyzed. In this study, we construct two models of Zika virus transmission. The first one is the vector-host model. It considers the human population as host and mosquito's population as the vector. The second model is where there is only infected human population who act as transmitter without the existence of infected mosquitoes in the population. The impact of modeling assumption of Zika virus is studied by analyzed the reproduction number using Next Generation Matrix (NGM) method. Formerly, we compare the dynamics of the two models by interpreting the reproduction number of each model. Biologically, the two models cause a similar effect. If the reproduction number is less than one, then the disease is extinct. Otherwise, an endemic condition exists. The numerical simulation also used to explain the comparison of two models. The recovery and the transmission period are solved to compare these two cases. Keywords: comparison, mathematical model, reproduction number, SEIR, Zika Virus.

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