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All Journal Jupiter Jurnal Ilmu dan Teknologi Hasil Ternak Jurnal Sains dan Teknologi Jurnal Sains Peternakan Indonesian Journal on Computing (Indo-JC) Pendas : Jurnah Ilmiah Pendidikan Dasar JURNAL PENGABDIAN KEPADA MASYARAKAT KOMPUTEK Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Jurnal TAMBORA Genta Bahtera : Jurnal Ilmiah Kebahasaan dan Kesastraan Santhet: (Jurnal Sejarah, Pendidikan Dan Humaniora) Jurnal Ilmiah Akuntansi Kesatuan Jurnal Komunikasi Nusantara Jurnal Komunikasi Nusantara MANDAR: Management Development and Applied Research Journal Budimas : Jurnal Pengabdian Masyarakat Coopetition : Jurnal Ilmiah Manajemen Jurnal FASILKOM (teknologi inFormASi dan ILmu KOMputer) CIVICS: Jurnal Pendidikan Pancasila dan Kewarganegaraan Buletin Poltanesa Tafkir: Interdisciplinary Journal of Islamic Education KLIK: Kajian Ilmiah Informatika dan Komputer Britain International for Linguistics, Arts and Education Journal (BIoLAE Journal) International Journal of Educational Review, Law And Social Sciences (IJERLAS) AbdiTechno (Jurnal Pengabdian Masyarakat) Education Achievement: Journal of Science and Research Profitabilitas Jurnal Ekonomi dan Manajemen Indonesia Mejuajua Sibatik Journal : Jurnal Ilmiah Bidang Sosial, Ekonomi, Budaya, Teknologi, Dan Pendidikan Jurnal Disastri: Pendidikan Bahasa dan Sastra Indonesia International Journal of Science and Society (IJSOC) Journal Media Public Relations IJIGAEd: Indonesian Journal of Islamic Golden Age Education Jurnal Teknik Sumber Daya Air Edukasia: Jurnal Pendidikan dan Pembelajaran Sistem Pendukung Keputusan dengan Aplikasi Adopsi Teknologi dan Sistem Informasi IKHLAS: Jurnal Pengabdian Dosen dan Mahasiswa JOURMICS : Journal of Media and Communication Studies Paradoks : Jurnal Ilmu Ekonomi Jurnal E-bussiness Institut Teknologi dan Bisnis Muhammadiyah Polewali Mandar Journal of Educational Management Research International Journal of Enterprise Modelling Amal Ilmiah: Jurnal Pengabdian Kepada Masyarakat Jurnal Kajian Wilayah dan Kota Mutiara : Jurnal Ilmiah Multidisiplin Indonesia Jurnal Spektrum Komunikasi Jurnal Karya Generasi Sehat Jurnal Informatika Polinema (JIP) Jurnal Pengabdian Masyarakat dan Riset Pendidikan Jurnal Pengabdian Masyarakat Jurnal Pembelajaran Bahasa dan Sastra Journal of Society Innovation and Development (JSID) Journal of Multidisciplinary Inquiry in Science, Technology and Educational Research The Indonesian Journal of Computer Science SENMEA Jurnal Pengabdian Kepada Masyarakat Ilmu Komunikasi Mekongga: Jurnal Pengabdian Masyarakat Multidisciplinary Indonesian Center Journal IRDH International Journal of Technology, Agriculture and Natural Sciences (IRDH IJTANS) Salaga Journal Jurnal Aktual Pendidikan Indonesia SCIENTIA JOURNAL : Jurnal Ilmiah Mahasiswa Prawara Jurnal Pengabdian Masyarakat Momentum Jurnal Inovasi dan Rekayasa Teknik Sipil (MJIRTS) Jurnal Informasi dan Teknologi (JITU) Jurnal Keilmuan Teknologi Informasi dan Ilmu Manajemen
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Pengaruh Pemadatan Tanah Dasar Terhadap Stabilitas Pondasi Dangkal pada Proyek Pembangunan Jalan Desa Suhardi; Femanueli Zega; Kamaluddin Lubis
Momentum Jurnal Inovasi dan Rekayasa Teknik Sipil (MJIRTS) Vol. 1 No. 1 (2025): Januari
Publisher : Marasofi International Media and Publishing (MIMP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64123/mjirts.v1.i1.5

Abstract

Stabilitas pondasi dangkal sangat dipengaruhi oleh kondisi tanah dasar, terutama pada proyek pembangunan jalan desa yang umumnya berada di atas tanah lempung atau tanah berorganik dengan daya dukung rendah. Pemadatan tanah dasar menjadi salah satu metode perbaikan tanah yang paling umum diterapkan untuk meningkatkan kapasitas dukung tanah dan mengurangi penurunan diferensial. Penelitian ini bertujuan untuk menganalisis pengaruh tingkat pemadatan tanah dasar terhadap stabilitas pondasi dangkal pada proyek pembangunan jalan desa di Kecamatan Sukamakmur, Kabupaten Bogor. Metode penelitian yang digunakan adalah studi eksperimental lapangan dengan uji pemadatan (Proctor), uji CBR, dan pengamatan langsung deformasi struktur pondasi setelah diberi pembebanan. Variasi tingkat pemadatan dibuat sebesar 85%, 90%, dan 95% dari Modified Proctor Maximum Dry Density (MDD), dan masing-masing dievaluasi terhadap stabilitas pondasi berupa daya dukung dan penurunan. Hasil menunjukkan bahwa peningkatan pemadatan dari 85% ke 95% menghasilkan peningkatan daya dukung sebesar 35% dan penurunan total berkurang hingga 50%. Studi ini menunjukkan pentingnya pengendalian kualitas pemadatan dalam proyek perkerasan jalan, terutama pada kondisi tanah dasar yang lemah. Rekomendasi teknis terkait metode pemadatan dan nilai target kepadatan disampaikan untuk digunakan pada proyek pembangunan jalan skala desa guna meningkatkan keandalan struktur dan umur layanan jalan. 
Rancang Bangun Aplikasi Pengaduan Budidaya Tambak Kelompok Tani Berbasis Web pada Dinas Perikanan Kabupaten Luwu Timur Wahid Sukmana, Abdul; Makmur, Alfhian; Suhardi
Jurnal Informasi dan Teknologi Vol 2 No 1 (2025): JITU: Jurnal Informasi dan Teknologi Universitas Cokroaminoto Palopo
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/jitu.v2i1.110

Abstract

Penelitian ini bertujuan merancang dan membangun sebuah aplikasi berbasis web untuk memudahkan kelompok tani di Kabupaten Luwu Timur dalam menyampaikan pengaduan terkait permasalahan budidaya tambak mereka. Jenis penelitian yang digunakan dalam merancang dan membangun sistem pengaduan budidaya tambak kelompok tani ini adalah Research and Development (R&D) dengan menerapkan metode pengembangan waterfall, penelitian ini dilakukan secara bertahap mulai dari analisis kebutuhan, perancangan sistem, penulisan kode program, pengujian, hingga implementasi. Hasil evaluasi oleh para ahli dan pengguna menunjukkan bahwa aplikasi yang telah dikembangkan memenuhi kriteria kelayakan dengan skor rata-rata tiap hasil penilaian adalah 3,95 yang masuk dalam kategori “Sangat Layak”. Dengan adanya aplikasi ini, diharapkan dapat meningkatkan efisiensi dalam pengelolaan pengaduan, memberikan informasi yang lebih transparan kepada kelompok tani, serta mendukung upaya pemerintah dalam meningkatkan kualitas dan produktivitas budidaya tambak.
Perbandingan Kalman Filter dan Exponential Moving Average pada Sensor Ultrasonik dalam Sistem Smart Waste ATM Wijaya, Andy; Suhardi; Sari, Kartika
JST (Jurnal Sains dan Teknologi) Vol. 14 No. 2 (2025): July
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jst-undiksha.v14i2.101049

Abstract

Waste level monitoring is still often done manually, making it inefficient in preventing accumulation. Ultrasonic sensors are widely used because they are practical and affordable, but their accuracy is often affected by environmental and hardware conditions. This study aims to compare the Kalman Filter and Exponential Moving Average methods to improve the accuracy of ultrasonic sensor readings in an automated waste monitoring system. The type of research used is an experiment with a microcontroller-based system that is tested on various waste height variations. The Kalman Filter combines previous estimates with new data, while the Exponential Moving Average gives more weight to the most recent value. The performance of both methods is assessed based on measurement consistency and error rate.The data was then analyzed quantitatively using Root Mean Square Error (RMSE).The results show that the Kalman Filter produces lower errors and more stable data compared to the Exponential Moving Average or raw data. In conclusion, the Kalman Filter is more effective in improving the reliability and accuracy of the automated waste monitoring system. The implications of this research suggest that selecting the right sensor type can significantly improve system performance in detecting waste capacity in real time.
Pemberdayaan UMKM Turunan Nanas Melalui Platform Digital di Desa Belantaraya Kecamatan Gaung Rahayu Putri, Eka Indah; Rahmat Saputra, Randi; Ruvita, Diana; Ulandari, Ratu; Mukhlis, Fezli; Sartika; Riskifitriadi; Agung; Rizkan, Muhammad; Suhardi; Suriansyah; Sakrani; M.Sopyan; Jumiati; Adi Putra, Bambang Sasmita
IKHLAS: Jurnal Pengabdian Dosen dan Mahasiswa Vol. 4 No. 2 (2025): IKHLAS: Jurnal Pengabdian Dosen dan Mahasiswa
Publisher : Indra Institute Research & Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58707/ikhlas.v4i2.1378

Abstract

The Community Service Program (KKN) in Belantaraya Village, Gaung District, Indragiri Hilir Regency, focused on empowering Micro, Small, and Medium Enterprises (MSMEs) producing pineapple-based products such as dodol and jam. The main challenges faced by local entrepreneurs were limited marketing strategies, simple packaging, and the absence of business legality. This program was carried out through a participatory approach involving observation, interviews, mentoring, and training related to product innovation and digital marketing strategies. The results showed an increased awareness of MSME actors regarding the importance of business identity through logo design, improved and more hygienic packaging, and the utilization of digital platforms such as social media for product promotion. In addition, entrepreneurs were assisted in obtaining a Business Identification Number (NIB) as a form of legal recognition. Through this digital-based empowerment, pineapple dodol and jam products have greater potential to compete, expand their market reach, and contribute to the local economy
Analisis Sentimen Mengenai Childfree Menggunakan Metode Naïve Bayes: Analisis Sentimen Mengenai Childfree Menggunakan Metode Naïve Bayes Yeni Safitri; Rakhmat Kurniawan; Suhardi
The Indonesian Journal of Computer Science Vol. 13 No. 4 (2024): The Indonesian Journal of Computer Science (IJCS)
Publisher : AI Society & STMIK Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33022/ijcs.v13i4.4136

Abstract

The emergence of the issue of childfree has become a trending topic on Twitter since the beginning of 2020 until now, which has given rise to many positive and negative opinions from various groups, especially on Twitter social media. This sentiment analysis research aims to determine the responses given regarding childfree in the form of positive, neutral or negative opinions by collecting Twitter data. The number of datasets used is 700 data, divided into 630 training data and 70 test data. This research uses the Naïve Bayes algorithm classification and confusion matrix as a performance evaluation of the system being built. The test results show an accuracy value of 64.29%, precision of 68.25%, recall of 64.29% and fi-score of 55.69%.
Penerapan Jaringan Sensor Nirkabel dan Internet of Things (IoT) pada Pertanian Terpadu Suhardi; Dedi Triyanto; Irma Nirmala
KLIK: Kajian Ilmiah Informatika dan Komputer Vol. 4 No. 5 (2024): April 2024
Publisher : STMIK Budi Darma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30865/klik.v4i5.1823

Abstract

Integrated farming system is an approach to managing plants, livestock, and fish along with their environment to create optimal results. The development of integrated agriculture is advancing with technologies such as Wireless Sensor Networks and the Internet of Things (IoT), enabling remote monitoring and control of agricultural environmental conditions. For this purpose, an application called "Integrated Farming System based on Wireless Sensor Networks and the Internet of Things (IoT)" has been developed. The system takes the form of aquaponics, consisting of areas for cultivating plants and ponds for fish farming, using subjects like Pakcoy plants and Nile tilapia fish. This system has been successfully implemented, reading water conditions including temperature and pH, as well as air conditions such as temperature and humidity. Moreover, the system can also monitor the status of the water pump used to channel water from the pond to the pipes, and it can control feeding in the livestock. Monitoring and control processes within this system are carried out using a website application.
Peranan Motivasi Intrinsik Terhadap Perilaku Belajar Siswa SMK Muhammadiyah 5 Kisaran Suhardi; Aswan; Sutrisno
EDUKASIA Jurnal Pendidikan dan Pembelajaran Vol. 3 No. 3 (2022): Edukasia: Jurnal Pendidikan dan Pembelajaran
Publisher : LP. Ma'arif Janggan Magetan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62775/edukasia.v3i3.217

Abstract

Motivasi memegang peranan penting dalam memberikan gairah, semangat dan rasa senang dalam belajar, sehingga siswa yang mempunyai motivasi tinggi mempunyai energi yang banyak untuk melaksanakan kegiatan belajar. Penelitian ini ialah penelitian kuantitatif. Jumlah sampel dalam penelitian ini ada 84 orang siswa. Berdasarkan hasil penelitian diketahui bahwa motivasi intrinsik siswa Kelas XI di SMK Muhammadiyah 5 Kisaran dalam kategori sangat baik yakni sebesar 69%. Sedangkan perilaku belajar siswa Kelas XI di SMK Muhammadiyah 5 Kisaran dalam kategori baik yakni sebesar 83%. Dan hasil perhitungan angket menunjukkan terdapat peranan motivasi intrinsik terhadap perilaku belajar siswa Kelas XI di SMK Muhammadiyah 5 Kisaran, dimana nilai chi kuadrat yang diperoleh sebesar 43,41. lebih besar dari harga kritik sebesar 21,7. Adapun kuat peranan tersebut dalam taraf sedang atau cukup, yang dapat dilihat dari nilai KK sebesar 0,58. Adapun faktor yang mendukung motivasi intrinsik terhadap perilaku belajar siswa di SMK Muhammadiyah 5 Kisaran terdiri dari faktor internal dan eksternel. Faktor internalnya berupa kondisi siswa serta adanya cita-cita atau aspirasi siswa. Sedangkan faktor eksternalnya berupa peran guru serta dukungan orang tua. Adapun faktor penghambat internal berupa kecerdasan/intelegensi siswa, dan faktor penghambat eksternal berupa lingkungan teman. Berdasarkan hasil penelitian penulis menyarankan kepada siswa agar dapat memilih lingkungan teman dengan motivasi belajar yang tinggi supaya dapat membawa pengaruh positif pada motivasi dan perilaku belajarnya. Kepada guru juga disarankan untuk lebih menciptakan suasana belajar yang nyaman dan menggunakan berbagai metode di kelas agar motivasi siswa tetap terjaga dengan baik.
Implementasi Kriptografi AES pada Sistem Enkripsi Gambar berbasis Web dengan Kunci Ephemeral yang dihasilkan API Machfudz, Emir Syarif; Suhardi
KOMPUTEK Vol. 9 No. 2 (2025): Oktober
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jkt.v9i2.3469

Abstract

This study implements the Advanced Encryption Standard (AES) algorithm in a web-based image encryption system utilizing an ephemeral key generated by an API. The research is motivated by the increasing threats to digital data security, such as identity theft and information manipulation, as well as the weaknesses of static key usage in AES encryption. The developed system consists of a client-side web application and a RESTful API server. The client side, built with HTML, CSS, and JavaScript, receives image input, requests the API for a key, and performs AES-256 encryption in Cipher Block Chaining (CBC) mode with a unique Initialization Vector (IV). The server side generates a random 256-bit key, stores it temporarily for approximately 30 seconds, and sends the key ID to the client. Testing was conducted on images sized 50 KB, 200 KB, and 1000 KB to measure encryption time. The results show that encryption time increases linearly with image size, with minimal overhead that does not affect performance. The ephemeral key approach enhances security by limiting the opportunity for unauthorized access to the key, while client-side encryption ensures that raw image data is never transmitted to the server. These findings demonstrate that implementing AES with ephemeral keys effectively improves the security of web-based image encryption.
The Effect of Capital Structure, Liquidity, and Profitability on Corporate Financial Performance Purwasih, Rani; Suhardi; Makrus, Mohamad
MANDAR: Management Development and Applied Research Journal Vol 7 No 2 (2025): June (2025)
Publisher : Universitas Sulawesi Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31605/mandar.v7i2.5135

Abstract

This study aims to determine the effect of capital structure, liquidity, and profitability on the financial performance of transportation and logistics sector companies listed on the Indonesia Stock Exchange during the 2020-2024 period. The variables used in this study include Debt to Equity Ratio (DER), Current Ratio (CR), and Return on Assets (ROA) as independent variables, and Return on Equity (ROE) as the dependent variable. The analysis method used is panel data regression with the Random Effect Model (REM) approach, which is analysed with Eviews 12 software. The results showed that capital structure (DER) has a negative and significant effect on financial performance (ROE), while liquidity (CR) and profitability (ROA) have no significant effect. However, simultaneously, the three variables have a significant impact on financial performance. This finding confirms the importance of optimal capital structure management in improving company performance, while liquidity and profitability require more effective strategies to contribute maximally to company profits.
Business Process for debit card transactions using Electronic Data Capture (EDC) Case study: Bank CIMB Niaga Tbk Samuel Andi Kristyan; Suhardi
Indonesian Journal on Computing (Indo-JC) Vol. 9 No. 1 (2024): April, 2024
Publisher : School of Computing, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34818/INDOJC.2024.9.1.880

Abstract

EDC (Electronic Data Capture) in banking is a means of expediting transactions at trade outlets. Sometimes not all buyers bring cash to buy the goods they want, usually the shop owner/keeper directs the buyer to withdraw money at an ATM or transfer using mobile banking or something similar. The problem that occurs is that sometimes there are queues at the ATM and not all buyers activate mobile banking. In fact, sometimes you don't end up buying an item that you have bargained for/liked, it's just a matter of a difficult transaction process. The presence of EDC banking machines can reduce the above problems. EDC is a transaction tool that is widely used today. Apart from ease of transactions, it also leaves several problems that need to be fixed. In this paper the author wants to analyze business processes and improvements so that they can minimize the risk of crime and lost property.
Co-Authors Abdul Azis Abdul Malik Abdul Waris Afrizal Agung Agustin, Indah Tri Ahada Wahyusari Ahmad Munir Aida Aidil Halim Lubis Ainun Sajidah Ajeng Putri Larasati Akbar Dwi Dharmawan Amin, Mat Aminuyati Anastasia Siwi Andi Fakhrullah Andi Taufik Andiana Perizga Andy Wijaya Anhar Faisal Fanani Anindyasari, Dinar Annisa Aprilia Annisa, Khairun Anugrah Feri Hermanto Aprilia, Widya Apriyoga, Wahyu Aras Fikar Mardatilah Ari Wibowo Ari Wibowo ariono, joko Aswan Azhima, Rizkan Azzahra, Putri Khalisa Bambang Sasmita Adi Putra Budi Santosa Budi Santosa Camelia Claudia Cori Qamara Cucu Suhery Dahlan, Fadli Daniel Useng Dede Aprylasari Dede Nurrahman Dedi Triyanto Dedianto Pasomba Dhanardono, Bhima Difa Khusniyah Diyah Yumeina Eka Fitriani Elis Mukhlisoh Erni Ermawati Erwin Susanto Fabio Testy Ariance Loren Fahrurrozi Fajrih, Nurul Fakhrurrozi Azzukhruf Fathul Qorib Fatik, Siti Fatikhatus Sya'adah Febriana, Tesha Fransiska Femanueli Zega Feri Prasetyo H Fermawati Firmansyah S, Dede Fitri Silvia Sofyan Frianda Gultom, Irsan Gemala Hardinasinta GESTY ERNESTIVITA Gunawan, Cakti Indra Haerani Hafiz Muhardi Hamdan Hamdi Mayulu Harahap, Muhammad Rifai Hari Yeni Haris Mahmud Haris, M. Ichsan Herdiansyah, Sayyid Herlina Hirzen Hasfani Hondro, Murni Wati Husnul Mubarak I Putu Gede Didik Widiarta Ikhsan Ali, Muhammad Ikhwan Ruslianto Ilka Zufria Intan Febriana iqbal salim Irma Nirmala Isnadi Isnaini Leo Shanty Juhari Hasan Jumiati Junaedi Muhidong Jusmaeni Kamaluddin Lubis Kartika Sari Kartika Sari Kasliono Kasliono Keassy Ramayanti Simanjuntak Khusnul Aisaro Kresna Satya Nugroho Kusumaningsih, Rila Lase, Marnita Legi Elfitra Lilis Suryani Limbong, Nathasya TriOlivia Linawati Listia, Rosa Vavita Lubis, M. Syukri Azwar Luh Made Indah Sri Handari Adiputra M.Sopyan Machfudz, Emir Syarif Mahmud Achmad, Mahmud Majojo, M Yasin Makmur, Alfhian Makrus, Mohamad Marisa Midyanti, Dwi Masita, Riski Maulida Mustado Mohamad Ilham Habibi Mufliha Khaeratih Agus Muh. Tahir Muhamad Farik Soumena Muhamad Tabrani, Muhamad MUHAMMAD RIZAL Muhammad Tabrani Muhammad Tahir Sapsal Mukhlis, Fezli Muliawiwin Muqita Hanifah Hasanah Dilia Mursal Aziz Mursalim Muthia, Ayunda Nasution, Zulkipli Nelly Astuti Ningrum, Indri Ayu Ninis Sia Rahim Nirmala, Irma Novianti, Erika Nur Hasanah Pohan Nurfauziah Aini Nurhalizah, Siti Nurhalizah Nurhikmah Nurmasytha, Andi Nurul Azzahra Olly Sanny Hutabarat Parellangi Permana, Egitya Primus Mario Andaka Ginting Priyandaru , Hananda Purwasih, Rani Putri Ayu Wulandari, Putri Ayu Putri, Rika Putri, Yunita Sukma Radila Agustina Rafianza Althaf Rahayu Putri, Eka Indah Rahma Wijayanti Rahmad Firdaus Rahmat Saputra, Randi Rahmi Hidayati Rakhmat Kurniawan R Rani Rida Ridiawati Riska Safitri Riskifitriadi Riyanto, Didit Puji Rizkan, Muhammad robi sopandi Ruvita, Diana Sakrani Salamah Salengke, Salengke Salju Samuel Andi Kristyan Samuel Andi Kristyan Sarintan, Mauli Sartika Sasmita meirani Sinaga, Sarah Siregar, Anggi Rima Nauli Siti Habiba Siti Jamilah Siti Suwadah Rimang, Siti Suwadah Sitti Nur Faridah Sri Rejeki, Nadia Sriani Stefani Montela, Viona Sudin, Idris Sugianto Sugiyanto - Suhardi Suhardi Sulaiman, Agus Sumardin Surdani Kanopani Hutagalung Suriansyah Surip, M SUTRISNO Syamsul Bahri T. Lembong Misbah Tabrani, Muhamad Tedy Rismawan Tessa Dwi Leoni Testy Ariance Loren, Fabio Tety Kurmalasari Tria Anggraini , Yessa Tuha, Panca Tuah Ulandari, Ratu Uray Ristian Virliana Amanda Putri Aryani Wahid Sukmana, Abdul Wahyu Ningsih, Guslina Wahyu Prasetyo Wahyudi Rahmat Wahyuningtyas, Amalina Nur Wardian Widya Apriliah Widya Apriliah, Widya Wildani Aulia Fitri Windy YENI SAFITRI Yusterman Jaya Mendrofa Yusuf Ramadhan Nasution, Yusuf Ramadhan Zabran Adha, Fariq Zaitun Zefri Zumalia