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All Journal Journal of Science and Applicative Technology Seminar Nasional Teknologi Informasi Komunikasi dan Industri BAREKENG: Jurnal Ilmu Matematika dan Terapan Jurnal Matematika UNAND Indonesian Journal of Applied Mathematics Transcendent Journal of Mathematics and Applications Mathematical Sciences and Applications Journal
Eristia Arfi
Program Studi Matematika, Fakultas Sains, Institut Teknologi Sumatera, Lampung Selatan, 35365
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Penerapan Metode Multiple Scales untuk Masalah Galloping pada DuaSpans Kabel Transmisi Eristia Arfi
Seminar Nasional Teknologi Informasi Komunikasi dan Industri 2015: SNTIKI 7
Publisher : UIN Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (492.896 KB)

Abstract

In this paper, galloping model is derived by using of Hooke's Law and Newton's Law. Furthermore galloping model is reduced in order to obtain a set of integro-differential equations. Analysis of system response observed with the assumption that the frequency of the external force is very close to the natural frequency of the system. Second-order expansion of analytic solutions for stationary problem from integro-differential equationsare determined using the method of multiple scales. Analysis of the behavior of the system to stability point and dynamic of solutions that depend on the parameter indicates that the initial conditions of the system affect the oscillation behavior of cable.Keywords: galloping, multiple scales, perturbation, resonace.
Hubungan antara Ketercapaian dan Keterkontrolan Sistem Diskrit Linier Eristia Arfi
Jurnal Matematika UNAND Vol 1, No 1 (2012)
Publisher : Jurusan Matematika FMIPA Universitas Andalas Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jmu.1.1.67-70.2012

Abstract

Tulisan ini membicarakan hubungan antara ketercapaian danketerkontrolan sistem linier diskrit linier. HUbungan ini dijelaskan den-gan kaidah-kaidah aljabar linier. Hasil akhir menunjukkan sistem terca-pai jika dan hanya jika sistem terkontrol.
The Delay Simulation on Hierarchical Structure for Semi-Double Track of Railway Line Using Max-Plus Algebra Tri Utomo; Eristia Arfi
Journal of Science and Applicative Technology Vol 2 No 1 (2019): ICoSITeR Special Edition
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (335.852 KB) | DOI: 10.35472/281421

Abstract

The persistently inequality of development between major cities and surrounding areas caused the displacement process, that are transport of supplies or human itself (urbanization) or commonly known as the transportation. The government has set a number of policies to overcome transportation problems, for example construct a double track railway line. This study aimed to find an alternative solution to overcome the problems of transportation, especially railway line by optimizing of using single track railway line which is given the term semi-double track using Petri Nets and Max-Plus Algebra. In the previous research, a Max-Plus algebra model has been developed based on the hierarchical structure of semi-double track railway line. In this research, the model is simulated against the problem of delay.
Penerapan Manpower Planning (MPP) dan Full Time Equivalent (FTE) pada Bagian Produksi PT. Lampung Sukses Bersama (Lampung Banana Foster) Tia Riski Rahmadhani; Eristia Arfi
Mathematical Sciences and Applications Journal Vol. 4 No. 2 (2024): Mathematical Sciences and Applications Journal
Publisher : Department of Mathematics, Faculty of Science and Technology Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/msa.v4i2.32291

Abstract

PT. Lampung Sukses Bersama, commonly known as Lampung Banana Foster, is a specialized retail establishment dedicated to promoting indigenous Nusantara products, particularly those hailing from the Lampung region. The core values of Lampung Banana Foster revolve around ensuring top-notch product quality, premium service, and a modern aesthetic. In line with its organizational strategy, it places significant emphasis on the importance of effective human resource management. Through empirical research, a noticeable misalignment between available human resources and actual production output has been uncovered. The research data, focuses on the production output of the production department from April to June 2020, coinciding with the emergence of the Covid-19 pandemic and its consequential impacts on business operations. Analysis of this dataset highlights a significant disparity between employee headcount and Full-Time Equivalent (FTE) value. Using the framework of Manpower Planning (MPP), the study reveals that shortages in employee numbers vary on a monthly basis. Consequently, we suggest that augmenting the workforce through new employee recruitment is necessary to ensure an equitable distribution of workload among all staff members. This finding underscores the importance of strategic human resource interventions to maintain operational efficiency and organizational resilience amidst changing circumstances.
Analisis Efisiensi Proses Penentuan Harga Perkiraan Sendiri menggunakan Teori Antrian pada PTPN I Regional 7 Azzahra, Iqlima Dita; Arfi, Eristia
Transcendent Journal of Mathematics and Applications Vol 3, No 2 (2024)
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/tjoma.v3i2.41205

Abstract

This study aims to analyze the efficiency of the process for determining the Estimated Own Cost (HPS) by considering the number of incoming HPS packages and the average time taken to calculate HPS. The method used in this research is queueing theory with a FIFO (First In, First Out) queue discipline and a Multi-Channel Single-Phase (M/M/S) queueing model, utilizing historical data of incoming HPS packages from February to July 2024. The results of the analysis show that the queueing system at the HPS Subdivision of PTPN I Regional 7 has a utility factor of 2.198, indicating that the queueing system is overloaded. A utility rate greater than 1 signifies that the queueing system is not operating efficiently. This provides critical insights for PTPN I Regional 7 in designing more efficient HPS determination strategies based on the profile and needs of each work unit.
MATHEMATICS MODEL OF COMPACT TUMOR TO ANALYZE THE EFFECT ANTIANGIOGENIC THERAPY Arfi, Eristia; Putri, Dwi Mutiara; Wibarani, Yeni Gede; Rizka, Nela
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 18 No 3 (2024): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol18iss3pp1585-1594

Abstract

Based on their growth, tumors are classified into benign(compact) tumors and malignant (invasive) tumors. One of the treatments used for tumors is antiangiogenic therapy because this therapy has low toxicity. This study examines the effect of antiangiogenic therapy on compact tumors. The number of tumor cells changes over time are influenced by proliferation, death, and migration tumor cell. Antiangiogenic therapy can inhibit the process of angiogenesis which affect the dynamics of glucose flow. A lack of glucose flow will cause a decrease in tumor cell proliferation process which will decrease tumor growth rate. The finding suggests that maintaining glucose levels at or below a critical threshold is effective therapy.
Analisis Dinamik Model SIR Pada Kasus Penyebaran Penyakit Corona Virus Disease-19 (COVID-19) Sari, Shinta Puspita; Arfi, Eristia
Indonesian Journal of Applied Mathematics Vol. 1 No. 2 (2021): Indonesian Journal of Applied Mathematics Vol. 1 No. 2 April Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/indojam.v1i2.354

Abstract

Corona Virus Disease-19 (COVID-19) merupakan salah satu virus yang menyebabkan penyakit pada manusia dan hewan. Penyakit ini menyebabkan gangguan saluran pernapasan sedang atau berat. Telah dilakukan penelitian untuk mengetahui dinamika perkembangan COVID-19 dengan menggunakan model persamaan diferensial SIR. Model SIR merupakan salah satu pemodelan matematika yang menghubungkan antara individu yang rentan, terinfeksi dan individu yang sembuh. Berdasarkan hasil analisis dinamik model SIR dengan parameter laju infeksi dan laju kesembuhan berturut-turut yaitu beta = 0.5 dan gama=0.3 . Model SIR memiliki dua titik kesetimbangan yaitu kesetimbangan bebas penyakit pada titik E_0=(0,0,0) dan titik kesetimbangan endemik pada titik E_1=(gama/beta,0,0) . Analisis kestabilan perilaku dinamik model S dan I pada titik kesetimbangan E_0=(0,0,0) memiliki sifat semi stabil dan E_1=(gama/beta,0,0) memiliki sifat konstan. Hal ini menunjukkan bahwa akan terjadi epidemi COVID-19 dalam kurun waktu tertentu. Solusi dinamik model SIR pada titik kesetimbangan menggunakan solusi numerik metode runge-kutta orde 4 dengan solusi analitik menunjukkan suatu perbedaan yang tidak terlalu besar saat mencapai titik kestabilan.
Co-Authors Azzahra, Iqlima Dita Putri, Dwi Mutiara Rizka, Nela Sari, Shinta Puspita Tia Riski Rahmadhani Utomo, Tri Utomo, Tri Wibarani, Yeni Gede