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All Journal Teknik dan Ilmu Komputer JURNAL ELEKTRO ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika JRST (Jurnal Riset Sains dan Teknologi) TESLA: Jurnal Teknik Elektro TEKNIKA Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Jurnal Ilmiah Teknik Industri Jurnal Darma Agung Indonesian Journal of Computing, Engineering, and Design Walisongo Journal of Information Technology Jurnal Pendidikan dan Teknologi Indonesia JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Jurnal Teknik Sipil The International Journal of Education Management and Sociology Jurnal Pengabdian Masyarakat Charitas Jurnal Internasional Jurnal Informatika: Jurnal Pengembangan IT International Journal of Sustainable Building, Infrastructure and Environment Cylinder : Jurnal Ilmiah Teknik Mesin Widya Teknik
Melisa Mulyadi
Program Studi Teknik Elektro, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya, Jakarta
Religion Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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ANALISA PEMECAHAN BEBAN PADA PENYULANG SUBARU GARDU INDUK KENTEN PALEMBANG UNTUK MENURUNKAN JATUH TEGANGAN Azis, Abdul; Wijayanti, Linda; Mulyadi, Melisa
TEKNIKA: Jurnal Teknik Vol 10 No 2 (2023)
Publisher : Universitas IBA Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35449/teknika.v10i2.275

Abstract

Jatuh tegangan pada jaringan tegangan menengah merupakan suatu kondisi jumlah tegangan yang disalurkan tidak sama dengan tegangan yang diterima. Jatuh tegangan juga dipengaruhi oleh arus yang mengalir dan nilai resistansi dan reaktansi penghantar. Penyulang Subaru merupakan salah satu penyulang pada Gardu Induk Kenten yang mempunyai beban besar sehingga saat beban puncak, jatuh tegangannya cukup besar. Tujuan dari penelitian ini adalah untuk menganalisa jatuh tegangan pada Penyulang Subaru, ditinjau dari sebelum pemecahan beban dan setelah pemecahan beban pada saat beban puncak. Metode yang digunakan dalam penelitian ini adalah metode topologi jaringan. Hasil penelitian adalah sebelum pemecahan beban, jatuh tegangan 3 fasa pada Penyulang Subaru adalah 287,3229 V atau 1,4154%. Setelah pemecahan beban, jatuh tegangan 3 fasa pada Penyulang Subaru menjadi 109,1823 V atau 0,5300%, dan jatuh tegangan 3 fasa pada Penyulang Chevrolet menjadi 109,2697 V atau 0,5308%.
Pelatihan Mikrokontroler Dasar Arduino UNO dan Simulasi Tinkercad Gideon Manalu, Ferry Rippun; Wijayanti, Linda; Mulyadi, Melisa; Ghozali, Theresia; Sereati, Catherine Olivia; Kartawidjaja, Maria Angela
Jurnal Pengabdian Masyarakat Charitas Vol. 4 No. 02 (2024): Jurnal Pengabdian Masyarakat Charitas
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/charitas.v4i02.6168

Abstract

The Electrical Engineering study program of the Faculty of Engineering, Atma Jaya Catholic University of Indonesia has been collaborating with Harapan Bagi Bangsa Christian Middle School, Cilincing, North Jakarta for several years in an extracurricular program for junior high school students, as a form of community service from Electrical Engineering lecturers. The extracurricular activity program implemented is in the form of basic electronics training. The theme of the activity varies, according to the requests and needs of the partner schools. The first activity is to provide basic electronics skills training to students. This program received a very positive response from teachers and students. From the evaluation results of previous activities, all students wanted training activities with advanced materials. The training provided is an introduction to basic Arduino Uno microcontrollers using Tinkercad simulation software. The purpose of this activity is to conduct training on the introduction and how to program the Arduino Uno microcontroller to turn on Light Emitting Diodes (LEDs). The training was carried out at Harapan Bagi Bangsa Christian Middle School. The training began by assembling the resistor and LED components on the project board. After all the components were installed, an Arduino Uno microcontroller program was created to turn on the LEDs alternately according to the order of the program created. The training used Tinkercad simulation software and the Arduino Uno microcontroller board. From the results of the student evaluation, 92.2% of students gave good and excellent ratings, while 7.8% gave neutral ratings for this training.
Design and Implementation of Two-Axis Solar Tracker Bachri, Karel Octavianus; Wilson; Mulyadi, Melisa; Wijayanti, Linda; Hutapea, Duma Kristina Yanti; Siregar, Marsul
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 9 No 2 (2023): OKTOBER 2023
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v9i2.4983

Abstract

Makalah ini membahas perancangan dan implementasi sistem penggerak panel surya 2 sumbu dengan menggunakan motor servo yang dikendalikan oleh mikrokontroler arduino uno, sistem ini bekerja berdasarkan masukan sensor LDR sebanyak empat buah yang dipasang pada masing-masing sisi panel surya dan satu buah yang dipasang di tengah modul solar panel tersebut.Sensor LDR pun dihubungkan pada mikrokontroller yang akan mengolah masukkan yang diberikan menjadi keluaran tegangan kepada motor servo.Motor servo yang dipakai diperancangan alat ini sebanyak dua buah yang akan meggerakkan panel surya menuju arah vertical dan horizontal. Pengujian dilakukan dengan beberapa tahap seperti pengujian hasil yang didapatkan oleh panel surya dengan berbagai kondisi,pengujian sensor cahaya dan pengujian keseluruhan.Sehingga mendapatkan hasil yang cukup baik dan memuaskan,kedua motor servo dapat bergerak menerima hasil keluaran yang diberikan oleh mikrokontroller dan kelima sensor LDR dapat menerima cahaya matahari dan mendeteksi arah cahaya matahari secara cukup baik sehingga perancangan alat mendapatkan hasil keseluruhan secara cukup baik. Hasil keseluruhan daya yang didapat secara maksimal oleh panel surya sebanyak 12V yang akan bergerak mengikuti arah cahaya matahari.
Inovasi Struktural: Pemanfaatan Geofoam Expanded Polystyrene (Eps) Dalam Pembangunan Infrastruktur Modern Faishol, Akhmad; Wijayanti, Linda; Mulyadi, Melisa
Jurnal Teknik Sipil Vol. 17 No. 1 (2024): Juni 2024
Publisher : Faculty Of Engineering University 17 August 1945 Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/jts.v17i1.1595

Abstract

Bidang pembangunan infrastruktur kontemporer berada pada titik balik dalam sejarahnya, terjebak di antara tuntutan akan metode pembangunan yang ramah lingkungan dan pencarian inovasi yang tiada henti. Integrasi Geofoam Expanded Polystyrene (EPS) merupakan terobosan struktural yang menjanjikan perubahan revolusioner dalam berbagai aplikasi teknik terkait konstruksi infrastruktur modern. Tujuan dari penelitian ini adalah untuk mengetahui pemanfaatan Geofoam Expanded Polystyrene (EPS) dalam pembangunan infrastruktur modern. Penelitian ini menggunakan metode penelitian kualitatif. Jurnal ilmiah, makalah, buku, laporan penelitian, dan publikasi teknis terkait yang diterbitkan oleh instansi pemerintah, dunia usaha, dan lembaga penelitian merupakan sumber data sekunder yang digunakan dalam penelitian ini. Hasil penelitian menunjukkan bahwa Expanded Polystyrene (EPS) Geofoam merupakan bahan bangunan yang memiliki kualitas berbeda-beda sehingga menjadi pilihan tepat untuk pembangunan infrastruktur masa kini. Bobotnya yang rendah, kekuatan tekan yang tinggi, kualitas isolasi termal yang kuat, stabilitas dimensi yang konstan, ketahanan terhadap kerusakan kimia, beragam penggunaan, kelestarian lingkungan, dan keterjangkauan adalah beberapa atribut utamanya. Penggunaan EPS Geofoam pada berbagai proyek bangunan, seperti dinding penahan tanah, bandara, jalan tol, jembatan dan infrastruktur lainnya telah terbukti memberikan keuntungan besar dalam hal efektivitas biaya, kinerja struktural dan kelestarian lingkungan.
Using Content-Based Filtering and Apriori for Recommendation Systems in a Smart Shopping System Pebrianti, Dwi; Ahmad, Denis; Bayuaji, Luhur; Wijayanti, Linda; Mulyadi, Melisa
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 6 No. 1 (2024): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v6i1.393

Abstract

This research is motivated by the increasing significance of online shopping platforms and the challenges faced by users in locating products that align with their preferences and requirements, which can significantly influence the sales performance of online retailers. Consequently, the primary objective of this study is to design and implement a recommendation system capable of identifying suitable products and forecasting the purchase frequency for various product combinations, while also integrating this recommendation system with a smart shopping platform. To achieve this objective, the research employs machine learning techniques, specifically content-based filtering and the Apriori algorithm. Content-based filtering is utilized to analyze user preferences and behavioral patterns related to visited products, while the Apriori algorithm is employed to evaluate support and confidence values for item set combinations, thereby generating frequency values for future transactions involving product combinations. Additionally, a smart shopping system is developed and integrated, enhancing the shopping experience through smartphone applications and streamlining the payment process to facilitate seamless product purchases. The research methodology involves data collection pertaining to products and user preferences, followed by several testing involving a sample group of user respondents. The results demonstrate that the developed recommendation system effectively delivers relevant product recommendations based on user preferences, achieving a confidence value up to 98%. Furthermore, the smart shopping system proves capable of independently assisting users throughout the transaction process, thereby enhancing overall user experience and convenience.
Pelatihan Kecerdasan Buatan Menggunakan Teachable Machine untuk Siswa SMA Kelas XI Catherine Olivia Sereati; Ferry Rippun Gideon Manalu; Pascalis; Yudha Harnoko; Melisa Mulyadi; Sandra Octaviani B. Widiarto; Linda Wijayanti; Karel Octavianus Bachri; Widodo Widjaja Basuki; FLORENTIA ANGELINA
Jurnal Pengabdian Masyarakat Charitas Vol. 6 No. 01 (2026): Jurnal Pengabdian Masyarakat Charitas Juni 2026
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/charitas.v6i01.7605

Abstract

Digital literacy is crucial today, especially as artificial intelligence (AI) technology begins to develop. AI technology is widely discussed because it can help to improve efficiency in various fields of activity. The development of AI technology is basically aimed at improving human welfare, but there are disadvantages when AI technology is not used properly, which can harm society. To achieve beneficial outcomes and avoid the harm caused by the misuse of AI technology, it is deemed necessary to provide AI technology training to the community as early as possible. This community service activity provided AI training to students from Strada Santo Thomas Aquino High School, which has a mission that strongly supports the objectives of this training. This training activity began with an introduction to AI technology, which aimed to make students familiar with and understand the features of AI technology so that they are aware of the existence of AI around them. Students were explained how AI works, from database collection to pattern recognition, and were made aware that the use and development of AI technology must be carried out ethically and responsibly. The training method included an explanation of the importance and dangers of AI technology through presentations, discussions, and teamwork using the "Teachable Machine" application. Evaluation of activities was carried out through pretests and posttests as well as student feedback. The results showed an improvement in students' understanding of AI technology after participating in this training. The students were highly satisfied with the AI technology training provided, both in terms of the accuracy of the material explanation, the abilities of the instructors, and the benefits they received.
Performance Evaluation of Delay and Jitter in Optical Fiber Networks for Real-Time Multimedia Applications Ayu Mika Sherila; Melisa Mulyadi
Jurnal Elektro Vol 18 No 2 (2025): Jurnal Elektro: October 2025
Publisher : Program Studi Teknik Elektro, Fakultas Biosains, Teknologi, dan Inovasi, Universitas Katolik Indonesia Atma Jaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/jurnalelektro.v18i2.7230

Abstract

The increasing reliance on real-time services such as VoIP and video streaming underscores the critical role of fiber optic networks as high-capacity communication backbones. While optical fibers offer substantial bandwidth, this alone does not ensure optimal Quality of Experience (QoE); network delay and jitter remain prominent challenges that can disrupt audio clarity and video continuity. This paper presents a detailed analysis of delay and jitter phenomena within fiber optic systems, particularly emphasizing Passive Optical Network (PON) topologies. It explores the underlying causes of performance degradation from physical-layer limitations to architectural inefficiencies and critically assesses current mitigation techniques implemented at both the network level (e.g., Quality of Service mechanisms) and application level (e.g., jitter buffering strategies). The main contribution of this work is the introduction of a novel "Cross-Layer Performance Optimization Framework," which addresses the disconnect between static QoS enforcement and reactive application adaptations. By fostering dynamic interaction between the network and application layers, this framework aims to enable predictive control mechanisms that better safeguard user experience. Ultimately, this approach offers a pathway to more robust and efficient delivery of real-time services over next-generation optical access networks.
Sistem Penyeleksi dan Pengelompokan Produk Berdasarkan Warna Berbasis Programmable Logic Controller Tommy Yang; Melisa Mulyadi
Jurnal Elektro Vol 8 No 1 (2015): Jurnal Elektro Unika Atma Jaya
Publisher : Program Studi Teknik Elektro, Fakultas Biosains, Teknologi, dan Inovasi, Universitas Katolik Indonesia Atma Jaya

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Abstract

Menghadapi persaingan dalam dunia usaha mendorong produsen seperti bluetooth speaker untuk membuat produknya dengan berbagai warna yang menarik. Untuk mengelompokan hasil produk sesuai warnanya dibutuhkan suatu sistem yang dapat memilah  berdasarkan warna produk. Sistem ini dirancang dengan menggunakan programmable logic controller sebagai unit pengontrol,sistem pneumatik sebagai penggerak dan sensor warna serta mikrokontroler untuk mengolah keluaran sensor warna. Ada tiga warna produk yang dikelompokan yaitu warna merah, biru dan hijau. Berdasarkan hasil pengujian yang telah dilakukan sistem dapat memisahkan dan mengelompokan barang berdasarkan warna produk.
Analisis Dampak Pemasangan Grid Tie Inverter pada Interkoneksi antara Jaringan PLN dan Solar Cell Terhadap Faktor Daya dan Harmonisa Sistem Jessica Eda; Melisa Mulyadi; Budi Kartadinata; Harlianto Tanudjaja
Jurnal Elektro Vol 10 No 2 (2017): Oktober 2017
Publisher : Program Studi Teknik Elektro, Fakultas Biosains, Teknologi, dan Inovasi, Universitas Katolik Indonesia Atma Jaya

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Abstract

ABSTRAK Penggunaan solar cell menunjukkan peralihan sumber energi dari energi fosil kesumber energi terbarukan semakin meningkat. Pembangkitan energi listrik berbasis cahaya matahari itu semakin berkembang, dari yang harus menggunakan baterai, hingga dapat digunakan paralel dengan jaringan elektris yang sudah ada. Sistem yang dapat memadukan sistem solar cell dan electrical grid disebut sistem on-grid. Komponen penting dalam sistem on grid tersebut adalah Grid Tie Inverter (GTI) yang dapat mensinkronkan tegangan keluaran solar cell dengan tegangan penyedia suplai listrik utama, yaitu Perusahaan Listrik Negara (PLN). Penyambungan GTI pada sistem solar cell ini akan memberikan dampak tertentu pada jaringan yang sudah ada, khususnya harmonisa sistem. Penelitian ini bertujuan untuk menganalisis dampak penggunaan GTI pada jaringan utama, baik ditinjau dari nilai harmonisa yang akan mengindikasikan distorsi yang terjadi, maupun dari besar faktor daya total. Pengukuran dilakukan dengan alat power quality meter dengan membandingan besaran pengukuran pada kondisi PLN tanpa solar cell dan kondisi PLN dengan solar cell. Besaran yang diambil pada pengukuran meliputi besaran parameter harmonisa seperti tegangan, arus, daya, Total Harmonic Distortion (THD) tegangan dan THD arus. Dari analisis yang dilakukan, nilai distorsi tegangan sistem PLN dengan solar cell lebih kecil dari distorsi tegangan PLN karena adanya filter pada GTI yang digunakan. ABSTRACT During the last decade, the use of solar cell is increasing due to the changing trend of energy resources, from fossil energy to the renewable energy. Power generating based on solar energy is getting developed and resulted in batteryless solar cell. The system that can combine the solar cell system and the electrical grid described as on grid system. One of the most substansial component in on grid system is the Grid Tie Inverter (GTI) that could synchronize the output voltage of solar cell with the output voltage of the main utility grid, which is Perusahaan Listrik Negara (PLN). The connection of GTI in solar cell system will have certain impacts to the main grid, especially the system’s harmonics. This paper aims to analyze the effect of the use of GTI to the main supply to its harmonics value, that indicates the distortion level, and also to its total power factor. Power Quality Meter been used as the measurement instrument to compare the measurement value in two conditions, PLN with and without solar cell. The research has been done by measuring harmonic parameter such as voltage, current, power, THD of voltage and THD of current. The result of the measurement shows that the distortion value of PLN with solar cell is lower than the distortion value of PLN without solar cell because of the addition of filter in the GTI
ANTRIAN PEMESANAN TEMPAT DI RESTORAN BERBASIS SMARTPHONE Alexander Kevin; Melisa Mulyadi
Jurnal Elektro Vol 11 No 2 (2018): Oktober 2018
Publisher : Program Studi Teknik Elektro, Fakultas Biosains, Teknologi, dan Inovasi, Universitas Katolik Indonesia Atma Jaya

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Abstract

Ketersediaan tempat di restoran menyebabkan pelanggan restoran harus mengantri sampai ada tempat kosong. Biasanya pelanggan mencatatkan namanya dan jumlah orang yang akan makan ke pelayan di restoran kemudian harus menunggu diluar restoran sampai dipanggil oleh pelayan. Sistem antrian seperti ini dapat diubah menjadi lebih mudah dan menyenangkan bagi pelanggan dengan mengembangkan aplikasi antrian menggunakan smartphone. Pelanggan dapat memasukkan data antrian ke smartphone yang berbasis android. Bila pelanggan tidak menggunakan smartphone berbasis android maka ia dapat memasukkan data antrian lewat keypad matriks yang ada didepan restoran selanjutnya data tersebut diolah oleh arduino kemudian dikirim ke internet melalui node MCU. Seluruh data antrian baik yang dimasukkan melalui smartphone atau keypad matriks akan tersimpan pada database yang berada di internet. Bila sudah tersedia meja bagi pelanggan yang berada pada antrian, maka sistem akan mengirimkan perintah untuk memanggil pelanggan itu melalui aplikasi android atau short message service (SMS). The limited space at the restaurant causes customer to queue until there is an empty space. Usually customers register their names and the number of people who will eat to the waiter in the restaurant then have to wait in front of the restaurant until called by the waiter. Queuing systems like this can be changed to be easier and more enjoyable for customer by developing a queue application using a smartphone. Customer can enter queue data to an Android-based smartphone. If a customer does not use an Android-based smartphone then he can enter the queue data via the matrix keypad in front of the restaurant then the data is processed by Arduino and sent to the internet via the MCU node. All queue data either entered via a smartphone or matrix keypad will be stored in a database that is on the internet. When a table is available for customer who are in the queue, the system will send an order to call the customer through an android application or short message service (SMS).
Co-Authors Abdul Azis Agustinus Silalahi Ahmad, Denis Akhmad Faishol Alexander Kevin Anang Kukuh Adisusilo Anthon de Fretes Anwar, Hadrian Ayu Mika Sherila Bobby Sutrisno Catherine Olivia Sereati Duma Kristina Yanti Emmy Wahyuningtyas Evans Karlin Faishol, Akhmad Ferry Rippun Gideon Manalu, Ferry Rippun Gideon FLORENTIA ANGELINA HALIM, MARCHELL MORDEKHAI Hari Prasetijo Harlianto Tanudjaja Hartanto Wibisono Heri Andi Sitompul Hodmiantua Sitanggang Jakariya Jayawarsa, A.A. Ketut Jessica Eda Joevierdi, Joevierdi Julius Bata Karangga, Yusaphat Phosa Karel Octavianus Bachri Kartadinata, Budi Kartawidjaya, Maria A Kumala Indriati Kumar, Saurav Linda Wijayanti Lithrone Laricha Salomon Luhur Bayuaji, Luhur Lukas Lukas Mahyastuti, V. Winda Maria A. Kartawidjaja Maria A. Kartawidjaja Maria Angela Kartawidjaja Marsul Siregar Nova Eka Budiyanta Pascalis Pebrianti, Dwi Pradipta, Candraruna Rani Anggrainy Reki Arbianto Sandra Octaviani B. Widiarto setiawan, Dibyo Siahaan, Enzo W.B Sidharta, So Mario Siti Gusti Ningrum Stefan Adriel Stephanie Graciela Ludony Suhartono Sutanto, Daniel Denis Tajuddin Nur Theresia Ghozali Tommy Yang Toto Tohir Veronica Windha Mahyastuty Widodo Widjaja Basuki Wilson Wilson Kosasih YANASTANTO, GUSTIESAR ALBARRY Yudha Harnoko