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All Journal Jambura Journal of Mathematics FINANSIA : Jurnal Akuntansi dan Perbankan Syariah Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Nusantara Hasana Journal BULLET : Jurnal Multidisiplin Ilmu Journal of Innovative and Creativity Jurnal Komputasi
Ahmad Faisol
Universitas Lampung
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Social Sciences Other

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Pengaruh Aktivitas, Struktur Modal, Likuiditas Dan Ukuran Perusahaan Terhadap Pertumbuhan Perusahaan Pada Emiten Sektor Transportasi Dan Logistik Tahun 2017-2021 Tesya Faradilla; Irham Lihan; Ahmad Faisol
BULLET : Jurnal Multidisiplin Ilmu Vol. 2 No. 5 (2023): BULLET : Jurnal Multidisiplin Ilmu
Publisher : CV. Multi Kreasi Media

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study will look at the effects of activity, capital structure, liquidity, and firm size on company growth in the transportation and logistics sector for the period from 2017 to 2021. In this analysis, the population corresponds to the sector issuers for logistics and transportation from 2017 to 2021. The purposive selection method was used to choose the research sample, which consisted of 12 firms that would be the focus of the investigation. The Indonesian Stock Exchange provided the secondary data for the research. In this study, the analytic method included the use of descriptive statistics, classical assumption testing, panel data regression analysis testing, model testing and hypothesis testing. The dependent variable being assessed is sales growth, while the independent variables are working capital turnover, long term debt to equity ratio, the current ratio, and the logarithm of total assets. This study's conclusion is that, at a level of significance of 5%, activity, capital structure, and firm size all positively affect company growth. While the company growth is unaffected by liquidity.
Implementasi Pendekatan Shari'a Compliant Assets Pricing Model dalam Pembentukan Portofolio Optimal Saham Syariah Amalia Ratna Sari; Ernie Hendrawaty; Ahmad Faisol
FINANSIA : Jurnal Akuntansi dan Perbankan Syariah Vol 4 No 1 (2021): FINANSIA : Jurnal Akuntansi dan Perbankan Syariah
Publisher : Fakultas Ekonomi Dan Bisnis Islam IAIN Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32332/finansia.v4i1.3060

Abstract

Instrumen investasi pasti memiliki risiko yang menjadi pertimbangan bagi para investor. Sedangkan untuk menganalisis risiko yang ada para investor masih memiliki kemampuan yang relatif terbatas. Hal ini bisa mempengaruhi investor untuk mengambil keputusan dalam berinvestasi. Penelitian ini bertujuan untuk mengetahui komposisi portofolio optimal saham dan besarnya proporsi dana pada masing-masing saham menggunakan pendekatan Shari’a Compliant Assets Pricing Model yaitu mengganti risk free dengan SBIS (Serifikat Bank Indonesia Syariah). Penelitian ini memiliki populasi sebanyak 17 saham yang tergabung dalam JII 30 secara berturut-turut pada tahun 2016−2018. Hasil penelitian menunjukkan terdapat 9 saham yang masuk dalam portofolio optimal serta proporsi dana yang terbentuk yaitu: ICBP sebesar 21,30%, ADRO sebesar 15,67%, ASII sebesar 12,73%, UNTR sebesar 12,35%, INCO sebesar 10,95%, INDF sebesar 10,79%, UNVR sebesar 8,562%, TLKM sebesar 7,354%, dan KLBF sebesar 0,294%,
The Effect of Environmental Performance on Firm Value with Profitability as a Mediating Variable: An Empirical Study of SRI-KEHATI Indexed Companies Listed on the Indonesia Stock Exchange (2021–2023) Putri Asrar Fenani; Ahmad Faisol
Journal of Innovative and Creativity Vol. 5 No. 2 (2025)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v5i2.611

Abstract

This study aims to examine the effect of environmental performance on firm value with profitability as a mediating variable in companies included in the SRI-KEHATI index on the Indonesia Stock Exchange during the 2021–2023 period. Environmental performance is measured using the PROPER score published by the Ministry of Environment and Forestry, profitability is measured by Return on Equity (ROE), and firm value is measured using the Tobin’s Q ratio. This research uses a quantitative method with secondary data obtained from annual reports and PROPER reports of the companies. The research sample was selected using purposive sampling technique, resulting in 6 companies with 18 observations over three years. Data analysis was performed using panel data regression and the Sobel Test for mediation analysis. The results show that environmental performance does not have a significant effect on company profitability, indicating that efforts to improve environmental performance have not been able to provide a direct impact on company profits in the short term. Conversely, profitability is proven to have a positive and significant effect on firm value, confirming that companies with high profitability are more valued by the market. Testing the direct effect of environmental performance on firm value also shows insignificant results, although the direction of the effect is positive. However, the Sobel mediation test results show that profitability significantly mediates the effect of environmental performance on firm value. This means that an increase in environmental performance followed by an increase in profitability will have a positive impact on firm value. This research implies that the integration of environmental and financial strategies is very important in efforts to create sustainable firm value. The limitation of this study lies in the short observation period and the exclusion of other control variables that may affect firm value.
Penentuan Invers Matriks Tridiagonal Dengan Algoritma Lewis David Aji Saputra; Ahmad Faisol; Fitriani
Jurnal Komputasi Vol. 13 No. 2 (2025)
Publisher : Jurusan Ilmu Komputer Fakultas MIPA Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/komputasi.v13i2.312

Abstract

Matriks tridiagonal merupakan jenis matriks bujursangkar yang hanya memiliki elemen tidak nol pada diagonal utama, superdiagonal, dan subdiagonal. Matriks jenis ini sering muncul dalam penyelesaian sistem persamaan linear serta dalam berbagai penerapan komputasi numerik. Salah satu tantangan utama dalam penggunaan matriks tridiagonal adalah menentukan inversnya secara efisien. Penelitian ini bertujuan untuk menentukan invers matriks tridiagonal menggunakan Algoritma Lewis, yaitu metode berbasis rekursif yang memanfaatkan pola hubungan antar elemen untuk menghasilkan invers dengan lebih cepat dan efisien, khususnya untuk matriks berdimensi besar dan sparse. Penelitian ini dilakukan secara analitik dan diperkuat dengan implementasi menggunakan bahasa pemrograman Python. Hasil penelitian menunjukkan bahwa Algoritma Lewis mampu menentukan invers matriks tridiagonal secara sistematis dengan validasi melalui perkalian kembali matriks awal dan hasil invers yang menghasilkan matriks identitas.
ANALISIS KEBIJAKAN DIVIDEN PADA PERUSAHAAN MANUFAKTUR YANG TERDAFTAR DI BURSA EFEK INDONESIA PERIODE 2020-2024 Rosa Fitri; Ernie Hendrawaty; Ahmad Faisol
Nusantara Hasana Journal Vol. 5 No. 12 (2026): Nusantara Hasana Journal, May 2026
Publisher : Yayasan Nusantara Hasana Berdikari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59003/nhj.v5i12.2172

Abstract

Dividend policy is a crucial decision for manufacturing companies as it must balance shareholder interests with the company’s needs for future business sustainability. This study aims to examine the effect of liquidity (CR), leverage (DER), profitability (ROE), and company size (Size) on dividend policy (DPR) in manufacturing companies listed on the Indonesia Stock Exchange (IDX) for the 2020-2024 period. This study uses is quantitative approach utilizing secondary data obtained from the annual reports of manufacturing companies published on the company’s official website and the IDX. The research sample includes 34 manufacturing companies selected using a purposive sampling method. The data analysis method used is panel data regression analysis using Eviews 12 software. The research findings indicate that liquidity (CR) and company size (Size) have a positive and significant effect on DPR, while leverage (DER) and profitability (ROE) do not affect dividend policy (DPR). Simultaneously, all independent variables have a significant effect on dividend policy. These results indicate that cash availability and company scale are the main factors for companies in predicting dividend receipts.
(α, β)-Derivation on Matrix Ring Mn(R) Dania Azzahra; Fitriani Fitriani; Ahmad Faisol
Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Volume 14 Issue 1 April 2026
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/euler.v14i1.37789

Abstract

In ring theory, a derivation is an additive mapping d:R→R satisfying Leibniz’s rule. A well-known generalization of this notion is the (α,β)-derivation, defined with respect to two ring endomorphisms α and β. In this paper, we study (α,β)-derivations on the matrix ring Mₙ(R) and several of its subrings, including scalar matrices, diagonal matrices, and upper and lower triangular matrix rings. It is shown that an (α,β)-derivation on the base ring RRR induces an (α′,β′)-derivation on these matrix subrings via entrywise extension, preserving their structural properties. Furthermore, we examine certain properties of (α,β)-derivations on the direct product ring R×R. In particular, we show that the sum of two (α,β)-derivations does not necessarily form an (α,β)-derivation, which is demonstrated through a counterexample.
The Connection Between Jordan Derivations and Nilpotent Derivations on 2-Torsion-Free Semiprime Rings Rahmah Mutiara Ayu Ningtiyas; Fitriani Fitriani; Ahmad Faisol
Jambura Journal of Mathematics Vol 8, No 2: August 2025
Publisher : Department of Mathematics, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjom.v8i2.37723

Abstract

Let R be a ring. A derivation on a ring is an additive map that satisfies the Leibniz rule d(ab) = d(a)b + ad(b), for every a, b ∈ R. A derivation d on a ring R is called a nilpotent derivation if there exists a natural number n such that dⁿ(R) = 0. This research studies nilpotent Jordan derivations on 2-torsion-free semiprime rings. Motivated by the results of Brešar, Chung, and Luh on Jordan derivations and nilpotent derivations, the study aims to analyze their nilpotency patterns and the behavior of inner derivations generated by nilpotent elements. Using a deductive literature-study approach through mathematical proofs and examples, we show that if d²ⁿ(R) = 0 for some n ∈ N, then d²ⁿ⁻¹(R) = 0. Consequently, every nonzero nilpotent Jordan derivation has an odd nilpotency index. In addition, for a nilpotent element P ∈ R with nilpotency index n, the inner derivation dₚ(x) = [p, x] is nilpotent with nilpotency index at most 2n − 1. These results contribute to a deeper understanding of derivation structures on 2-torsion-free semiprime rings.
Co-Authors Amalia Ratna Sari Azkia Nadwah Dania Azzahra David Aji Saputra Ernie Hendrawaty Fitriani Fitriani Fitriani Irham Lihan Nusyirwan Nusyirwan Putri Asrar Fenani Rahmah Mutiara Ayu Ningtiyas Rosa Fitri Tesya Faradilla