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All Journal Sistemasi: Jurnal Sistem Informasi Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC)
Lestari, Nabilah
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Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering

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Studi Komparatif Modulasi M-QAM dan QPSK pada Jaringan 4G-LTE Pebriyanti, Cahyani; Lestari, Nabilah; Asyiyah, Nur; Setyowati, Endah; Pynda, Khanzademma Qeisha; Nasrullah, Daffa' Sami; Alifi, Daryan Pratama
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 6, No 1 (2024): February
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v6i1.2003

Abstract

Kemajuan teknologi telekomunikasi, khususnya jaringan 4G atau LTE (Long Term Evolution), telah mengubah dunia komunikasi seluler secara signifikan. Namun, dengan meningkatnya penggunaan layanan 4G LTE sering kali diikuti oleh gangguan sinyal yang cukup mengganggu. Studi ini menggunakan metode literature review dengan menggali data yang ada sebelumnya, diikuti dengan analisis dan eksplanasi rinci untuk melengkapi penelitian sebelumnya. Penelitian ini berfokus pada berbagai tingkat modulasi, termasuk QPSK, 16-QAM, 64-QAM, dan 256-QAM. Parameter utama yang diamati adalah throughput, yang merupakan ukuran utama untuk mengevaluasi efisiensi teknik pengiriman data dalam berbagai kondisi. Hasilnya menunjukkan bahwa modulasi tingkat tinggi, seperti 256-QAM dan 64-QAM, menunjukkan nilai throughput  yang lebih tinggi dibandingkan dengan modulasi QPSK. Diharapkan bahwa penelitian ini akan memberikan gambaran umum tentang hubungan antara modulasi dan teknologi 4G LTE.
Development of a Web-based Library Information System Integrated with a Webcam-based Barcode Scanner Lestari, Nabilah; Fauzi, Ahmad
Sistemasi: Jurnal Sistem Informasi Vol 15, No 4 (2026): Sistemasi: Jurnal Sistem Informasi
Publisher : Program Studi Sistem Informasi Fakultas Teknik dan Ilmu Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32520/stmsi.v15i4.6238

Abstract

The process of borrowing and returning books in some school libraries is still carried out manually, resulting in slower service times and a higher risk of data recording errors. Therefore, a library information system is needed to improve transaction efficiency and data management accuracy. This study aims to develop a web-based library information system integrated with a webcam-based barcode scanning feature, eliminating the need for additional scanning devices. The research employs a Research and Development (R&D) approach using the Waterfall model, which includes the stages of requirements analysis, system design, implementation, and testing. System evaluation was conducted using Black Box Testing, transaction time efficiency analysis, data accuracy measurement, assessment of lighting intensity on webcam-based barcode scanning performance, and usability testing using the System Usability Scale (SUS). The results indicate that all system functions operate properly. The system reduces the average transaction time from 72.06 seconds to 24.48 seconds (66% efficiency improvement) and increases data recording accuracy from 60% to 100%. Webcam-based barcode scanning performs optimally under lighting conditions of ≥150 lux. The usability evaluation achieved a SUS score of 85.8 (excellent). However, system performance is still influenced by lighting conditions and camera quality. Future research may focus on enhancing the system by incorporating image processing techniques or alternative identification technologies to further improve scanning accuracy.
Co-Authors Alifi, Daryan Pratama Asyiyah, Nur Endah Setyowati Fauzi Ahmad Muda Nasrullah, Daffa' Sami Pebriyanti, Cahyani Pynda, Khanzademma Qeisha