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All Journal Jurnal Simantec JURNAL MEDIA INFORMATIKA BUDIDARMA Desimal: Jurnal Matematika Jurnal Ilmiah Wahana Akuntansi Scientific Journal of Reflection : Economic, Accounting, Management and Business Fair Value: Jurnal Ilmiah Akuntansi dan Keuangan JSI (Jurnal sistem Informasi) Universitas Suryadarma Al Furqan: Jurnal Ilmu Al Quran dan Tafsir IQ (Ilmu Al-qur'an): Jurnal Pendidikan Islam Jurnal Ilmiah STOK Bina Guna Medan INSPIREE: Indonesian Sport Innovation Review ARZUSIN: Jurnal Manajemen dan Pendidikan Dasar Jurnal Pendidikan Dasar Jurnal Arsitektur Jurnal Informatika Ekonomi Bisnis Persona: Kajian Bahasa dan Sastra Assyfa Journal of Islamic Studies Finance Aktivasi: Jurnal Pemberdayaan Masyarakat Journal of Foundational Learning and Child Development MILANG Journal of Mathematics and Its Applications
Ahmad Fajri
FH HAN unila
Religion Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Public Health Social Sciences Other

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Penerapan teknologi blockchain berbasis smart contract untuk meningkatkan keamanan transaksi finansial online Wirayuda, Steven Aprianto; Lailiyah, Siti; Fajri, Ahmad
Jurnal Simantec Vol 14, No 1 (2025): Jurnal Simantec Desember 2025 (Article in Progress)
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/simantec.v14i1.29893

Abstract

The digital transformation in the financial sector demands a transaction system that is not only fast and efficient but also secure and transparent. This study explores the application of blockchain technology as a solution to the problems found in centralized online financial transaction systems that are vulnerable to manipulation. The objective of this research is to design a blockchain-based financial transaction security system architecture that can be evaluated through a conceptual simulation approach. This study uses a descriptive qualitative method with tools such as Ganache, MetaMask, and Remix IDE to simulate smart contract-based transactions within a local blockchain environment. The novelty of this research lies in the integration of a security system modeling approach with realistic scenario-based simulations, which is rarely discussed in previous studies. The research contributes by producing a modular system architecture that integrates key components—users, smart contracts, validators, and regulators—into a cohesive workflow applicable to various digital financial platforms. Simulation results show that the proposed system enhances security, accelerates transaction validation, strengthens auditability, and reduces operational costs compared to conventional transaction systems. This study provides a strong foundation for the broader development of blockchain-based financial systems that are more resistant to external attacks.Keywords: System Architecture, Blockchain, Transaction Security, Smart Contract, Simulation
JUAL BELI ONLINE DALAM PERSPEKTIF EKONOMI ISLAM PADA MAHASISWA FEBI UNZAH Fajri, Ahmad
Finance : Journal of Accounting and Finance Vol. 1 No. 1 (2023): Volume 1 Nomor 1, Mei 2023
Publisher : universitas Islam Zainul Hasan Genggong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55210/m7gp9b84

Abstract

This study aims to examine the practice of online buying and selling conducted by students of the Faculty of Islamic Economics and Business at Zainul Hasan Islamic University (UNZAH), as well as to analyze these practices from the perspective of Islamic economics. The research employs a descriptive qualitative method with a case study approach. The data sources consist of both primary and secondary data, collected through observation, interviews, and documentation. Data analysis was carried out through data reduction, data presentation, and conclusion drawing. The findings indicate that online buying and selling practices among UNZAH students are carried out in two main stages. The first is the transaction mechanism stage, which begins with the buyer placing an order, followed by the online payment process. Several payment systems are utilized, including bank transfers, credit cards, PayPal, e-wallets, and Cash On Delivery (COD) systems. From the perspective of Islamic economics, the online buying and selling practices carried out by students generally comply with Islamic legal principles. These include requirements that the products sold must be halal and of good quality, the ownership status of the goods must be clear (whether they are personally owned or second-hand), and product quality must be guaranteed. Additionally, there should be a fair correlation between the price and quality of goods to prevent buyer dissatisfaction. Honesty in transactions must also be upheld, particularly concerning the level of trustworthiness between both parties involved.
UTANG PIUTANG DALAM PERSPEKTIF EKONOMI ISLAM Fajri, Ahmad
Finance : Journal of Accounting and Finance Vol. 2 No. 1 (2024): Volume 2 Nomor 1, Mei 2024
Publisher : universitas Islam Zainul Hasan Genggong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55210/0xb66e35

Abstract

Praktik transaksi utang piutang merupakan salah satu aspek pemenuhan hajat hidup melalui interaksi sosial. Sebuah transaksi yang sarat dengan keistimewaan dan keutamaan yang dijanjikan oleh Allah bagi pelakunya (pemberi utang). Praktik utang piutang, selain memiliki sisi positif melalui prinsip tolong-menolong, seringkali juga menjadi sumber perselisihan dan permusuhan antar manusia. Hal ini terjadi ketika manusia mengabaikan prinsip fundamental dalam praktik tolong-menolong ini, yakni kejujuran.
KAJIAN PENDUGA FUNGSI RAGAM PROSES POISSON PERIODIK MAJEMUK DENGAN TREN FUNGSI PANGKAT Fajri, Ahmad; Mangku, I Wayan; Hadi Sumarno
MILANG Journal of Mathematics and Its Applications Vol. 18 No. 2 (2022): MILANG Journal of Mathematics and Its Applications
Publisher : School of Data Science, Mathematics and Informatics, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/milang.18.2.87-97

Abstract

Pada artikel ini dibahas tentang pendugaan fungsi ragam pada proses Poisson periodik majemuk yang mempertimbangkan kehadiran tren fungsi pangkat. Penulisan artikel ini bertujuan untuk mengonstruksi penduga, memeriksa kekonsistenan penduga, menganalisis bias, ragam dan mean squared error (MSE) asimtotik penduga, serta menentukan ukuran interval pengamatan proses terpendek sehingga nilai dugaan yang diperoleh sudah mendekati parameter yang diduga menggunakan simulasi komputer. Hasil kajian yang telah diperoleh berupa rumusan penduga fungsi ragam, syarat-syarat agar penduga yang dirumuskan kokonsisten, rumusan bias asimtotik, ragam asimtotik dan MSE asimtotik penduga. Berdasarkan hasil simulasi diperoleh bahwa penduga sudah mendekati nilai parameter yang diduga jika panjang interval waktu pengamatan adalah 5500.
Parental Contributions to Character Development in Primary Education Fajri, Ahmad
Journal of Foundational Learning and Child Development Vol. 1 No. 01 (2025): January 27, 2025
Publisher : CV. INSPIRETECH GLOBAL INSIGHT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53905/ChildDev.v1i01.5

Abstract

Purpose of the study: This study aims to investigate the role of parents in supporting character education for primary school children in Bangkinang, Indonesia, and to identify effective strategies for parental involvement in character development. Materials and methods: A quantitative research design was employed, involving 186 parents of primary school children (grades 1-6) from five elementary schools in Bangkinang. Data were collected using a structured questionnaire measuring six dimensions of parental involvement in character education. Statistical analysis was conducted using IBM SPSS Statistics version 30. Results: The findings revealed that 78.5% of parents actively participated in their children's character education through various strategies. The most effective approaches included role modeling (M=4.32, SD=0.76), providing guidance (M=4.17, SD=0.84), and establishing consistent routines (M=3.98, SD=0.92). Significant differences were found between parental education levels and the implementation of character education strategies (p<0.05). Conclusions: The study concludes that parental involvement significantly contributes to character development in primary school children. Collaboration between parents and schools is essential for establishing effective character education. Parents who model positive behaviors, provide consistent guidance, and establish routines demonstrate the most effective approaches to character education
Co-Authors Agus Munandar, Agus Agustina Alwi, Wildan Amal, Muhammad Ikhlashul Ana Nurhasanah, Ana Anreani, Neni Arif Rahman Hakim Arman Husni Armanto, Nuruddin Cahyaningtiyas, Ayu Citra Azhariat Malasar Daryati, Daryati Dongoran, M Fadli Edi Mulyana Fajar Sidik Siregar Fama, Eugene Guntur Yulisatria Hadi Sumarno I Wayan Mangku Islamy, Diah Putri Ismail, Azmi Maharani, Putri Ayu Mispani MK, Samsul Moulida, Dhelia Rahma Muhammad Fahmi Muhammad Yusuf Nur Rahmi Nuraina, Kurnia Qomariyah Qomariyah Rajiansyah, Rajiansyah Ratna Sari Dewi Rofiah, Nur Ronaldi, Irvan Sholichah, Aas Siti Sigit Setiawan Siti Lailiyah, Siti Sutinah Sutinah Taruk Bua, John Alexandro Wahab, Abd. Azis Wirayuda, Steven Aprianto Yulianto Yulianto