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All Journal Jurnal Sains dan Teknologi Bulletin of Electrical Engineering and Informatics Jurnal Teknik Elektro Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika PROtek : Jurnal Ilmiah Teknik Elektro Jurnal Pengabdian UntukMu NegeRI JET (Journal of Electrical Technology) Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jurnal Sinergitas PkM & CSR TESLA: Jurnal Teknik Elektro KAIBON ABHINAYA : JURNAL PENGABDIAN MASYARAKAT Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Unri Conference Series: Community Engagement Journal of Applied Materials and Technology IGKOJEI: Jurnal Pengabdian Masyarakat Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) SAINSTEK Sewagati BATOBO: Jurnal Pengabdian Kepada Masyarakat
Rosma, Iswadi Hasyim
Jurusan Teknik Elektro, Fakultas Teknik, Universitas Riau
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Desain Pemantauan Energi Surya Real Time Berbasis Arduino Cloud Suwitno, Suwitno; Hutabarat, Bijujent; Ali, Nurhalim Dani Ali; Rosma, Iswadi Hasyim; Romy; Azni, Anisa Yulvi
SAINSTEK Vol. 13 No. 1 (2025)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/js.v13i1.307

Abstract

Saat ini, panel surya merupakan salah satu sumber energi terbarukan yang paling banyak digunakan dalam beberapa tahun terakhir. Panel surya berfungsi untuk mengubah radiasi sinar matahari menjadi energi listrik melalui proses fotovoltaik, yang menghasilkan arus searah (DC). Namun, panel surya memiliki sejumlah keterbatasan, sehingga pemantauan kinerja sistem fotovoltaik (PV) secara efektif menjadi aspek penting dalam pemanfaatan energi matahari. Berdasarkan hal tersebut, diperlukan perancangan sistem pemantauan panel surya yang efektif. Sistem ini mencakup pengukuran tegangan DC dan AC pada panel surya serta konverter, arus DC dan AC pada inverter, faktor daya (cos q), frekuensi, dan intensitas energi matahari. Dalam tulisan ini, sistem pemantauan yang dirancang melibatkan penggunaan rangkaian pembagi tegangan, sensor arus ACS712, rangkaian detektor titik nol, rangkaian pembeda fasa, ESP8266, Arduino, LCD 20x4, dan penyimpanan berbasis cloud. Energi total yang tercatat dari panel surya selama 12 jam pengamatan adalah sebesar 42,68 Wh. Setiap pengujian yang dilakukan menunjukkan bahwa sensor memiliki tingkat kesalahan rata-rata yang lebih kecil atau sama dengan 3,2%, dengan kecepatan pemrosesan data yang memerlukan waktu sekitar 4 hingga 5 detik untuk menghasilkan satu data pemantauan. Penyimpanan berbasis cloud sangat membantu dalam menyimpan data dalam jumlah besar dan memungkinkan pemantauan jarak jauh secara real-time.
Perancangan Pembangkit Listrik Tenaga Surya (PLTS) Untuk Supply Aerator pada Kolam Ikan dengan Sistem Bioflok Suwitno1, Suwitno; Harahap, Muhammad Nasir; Ali, Nurhalim Dani; Rosma, Iswadi Hasyim; Murdiya, Fri; Firdaus, Firdaus; Marpaung, Noveri Lysbetti
JET (Journal of Electrical Technology) Vol 10, No 2 (2025): Edisi Juni
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/jet.v10i2.12215

Abstract

Penelitian ini membahas perancangan Pembangkit Listrik Tenaga Surya (PLTS) untuk kolam ikan dengan sistem bioflok di Kampung Pangan Madani. Terdapat lima kolam ikan lele berkapasitas 1.000 ekor/kolam dan satu kolam ikan gurame dengan 250 ekor/kolam, yang memerlukan konsumsi energi listrik sebesar 6,6 kWh per hari. Analisis dilakukan menggunakan simulasi perangkat lunak PVSyst pada tiga topologi sistem PLTS, yakni On-grid, Off-grid, dan Hybrid. Hasil simulasi menunjukkan bahwa PLTS On-grid dengan 4 panel 250 Wp menghasilkan 1.325 kWh/tahun dan dinyatakan layak secara ekonomi dengan nilai COE Rp.1.404,00, NPV Rp.561.442 dalam 11 tahun, Shadow Price 1,01 per 1% perubahan, PI sebesar 1,49 dan DPP 11,97 tahun. Sementara itu, PLTS Off-grid dengan 10 panel 250 Wp dan 8 baterai 180 Ah menghasilkan 3.084 kWh/tahun, namun dinyatakan tidak layak dengan nilai COE Rp.2.951,84, NPV Rp.-86.075,46, PI 0,99 dan DPP 21 tahun. Pada analisa ekonomi dengan Shadow Price PLTS Off-Grid dengan NPV pada tahun ke-21 di peroleh hasil 0,94 per 1% perubahan. Adapun PLTS Hybrid dengan 5 panel 250 Wp dan 1 baterai menghasilkan 1.558 kWh/tahun dan dinyatakan layak dengan nilai COE Rp.1.799,50, NPV Rp.1.370.980 dalam 13 tahun,Shadow Price 0,99 per 1 % perubahan, PI 1,35,dan DPP 13,95 tahun. Penelitian ini menunjukkan bahwa sistem PLTS On-grid dan Hybrid lebih layak diterapkan untuk memenuhi kebutuhan energi listrik kolam ikan berbasis bioflok
TRANSFORMER HEALTH CONDITION ANALYSIS BASED ON HEALTH INDEX AND FAILURE METHOD Iswadi Hasyim Rosma; Boy Ihsan; Jikro Pikri
TESLA: Jurnal Teknik Elektro Vol 27 No 2 (2025): TESLA : Jurnal Teknik Elektro
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/tesla.v27i2.35671

Abstract

Transformers are one of the important assets whose health conditions need to be monitored to maintain operating reliability and prevent failures. Regular monitoring and testing can be done on transformer oil and insulating paper (furan). This article aims to evaluate the health index, estimate the remaining life and detect potential transformer failures. The test data used was obtained from two transformers at a biodiesel producing company in Indonesia, such as Dissolved Gas Analysis, Breakdown Voltage, Water Content, Acid, Interfacial Tension and 2 Fal (furan) tests. The method used in the diagnosis of transformer health conditions is the transformer health index method and analysis of potential failures based on the evaluation of Total Dissolved Combustible Gas, Roger's Ratio and Duval's Triangle. The results show that both transformers are in a healthy condition with a health index of 72% and 89%, which fall into the “Good” and “Very Good” categories, and the estimated operational life is more than 10 years and 15 years, respectively. However, the failure analysis results indicated an overheating failure with a temperature exceeding 700 ºC. Although the overall transformer condition is still good, preventive maintenance measures are still recommended to avoid more serious damage in the future Abstrak Transformator merupakan salah satu aset penting yang kondisi kesehatannya perlu dipantau untuk menjaga keandalan operasi dan mencegah kegagalan. Pemantauan dan pengujian secara berkala dapat dilakukan terhadap minyak transfomator dan isolasi kertas (furan). Artikel ini bertujuan untuk mengevaluasi indeks kesehatan, estimasi sisa umur dan mendeteksi potensi kegagalan transformator. Data pengujian yang digunakan diperoleh dari dua transformator di sebuah perusahaan penghasil biodiesel di Indonesia yaitu data hasil pengujian Dissolved Gas Analysis, Breakdown Voltage, Water Content, Acid, Interfacial Tension serta 2 Fal (furan). Metode yang digunakan dalam diagnosis kondisi kesehatan transformator adalah metode indeks kesehatan transformator serta analisis potensi kegagalan berdasarkan evaluasi Total Dissolved Combustible Gas, Roger’s Ratio dan Duval’s Triangle. Hasil penelitian menunjukkan bahwa kedua transformator berada dalam kondisi sehat dengan indeks kesehatan 72% dan 89%, yang termasuk kategori “Baik” dan “Sangat Baik”, serta estimasi umur operasional masing-masing lebih dari 10 tahun dan 15 tahun. Namun demikian, hasil analisis kegagalan mengindikasikan adanya kegagalan overheating dengan suhu melebihi 700 ºC. Meskipun kondisi keseluruhan transformator masih baik, tindakan pemeliharaan preventif tetap direkomendasikan untuk menghindari kerusakan yang lebih serius dimasa mendatang.
COMPARATIVE ANALYSIS OF MOTHER WAVELET FOR VOLTAGE SAG AND SWELL CLASSIFICATION USING DISCRETE WAVELET TRANSFORM (DWT) AND RADIAL BASIS FUNCTION NEURAL NETWORK (RBFNN) Nurhalim; Fera Gustia Handayani; Antonius Rajagukguk; Iswadi Hasyim Rosma; Edy Ervianto
TESLA: Jurnal Teknik Elektro Vol 27 No 2 (2025): TESLA : Jurnal Teknik Elektro
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/tesla.v27i2.35672

Abstract

Power quality disturbances, such as voltage sag and swell, can lead to system instability and equipment damage. In this study, identification is defined as the process of detecting the presence and characteristics of these disturbances through time-frequency feature extraction using the Discrete Wavelet Transform (DWT). A Radial Basis Function Neural Network (RBFNN) is then employed as the classification method to determine the specific type of disturbance (sag or swell).The need for an automated identification and classification system arises because manual monitoring is slow and subjective, whereas industrial applications require rapid decisions based on measurable metrics. The disturbance dataset, specifically comprising voltage sag and voltage swell, was generated through modeling and simulation using MATLAB/Simulink. Features were extracted from the disturbance signals by decomposing them up to 7 levels with the DWT, using four different Mother Wavelets: Daubechies-4 (db4), Haar, Symlet-4 (sym4), and Coiflet-4 (coif4). These feature datasets were then normalized and divided into training, validation, and testing sets to train and evaluate the RBFNN model. Performance was assessed based on Mean Squared Error (MSE), classification accuracy, and the confusion matrix as objective success criteria. The results indicate that all models successfully achieved an MSE below 10-5 and 100% accuracy on the test data, signifying a very low error rate. The model utilizing the Haar wavelet demonstrated the best training efficiency, requiring the fewest epochs. Therefore, this combination is highly recommended for practical power quality monitoring applications Abstrak Gangguan kualitas daya , seperti Voltage Sag, dan Swell, dapat menyebabkan ketidakstabilan sistem dan kerusakan pada peralatan. Identifikasi pada penelitian ini didefenisikan sebagai proses mendeteksi keberadaan dan karakteristik gangguan melalui ekstraksi fitur waktu- frekuensi menggunakan Discrete Wavelet Transform (DWT) dan Radial Basis Function Neural Network (RBFNN) sebagai metode klasifikasi untuk proses menentukan jenis gangguan (sag dan swell). Kebutuhan akan sistem identifikasi dan klasifikasi otomatis diperlukan karena pemantauan manual bersifat lambat dan subjektif, sementara industri memerlukan keputusan cepat berbasis metrik yang terukur. Dataset gangguan, yang secara spesifik mencakup Voltage Sag dan Voltage Swell, dihasilkan melalui pemodelan dan simulasi dengan perangkat lunak MATLAB/Simulink. Fitur dari sinyal gangguan ini diekstraksi dari dekomposisi Discrete Wavelet Transform (DWT) hingga 7 level, dengan empat variasi Mother Wavelet (Daubechies-4, Haar, Symlet-4, dan Coiflet-4). Data fitur tersebut kemudian dinormalisasi dan dibagi menjadi data training, validation dan testing, untuk melatih dan menguji model RBFNN, yang kinerjanya dievaluasi berdasarkan Mean Squared Error (MSE), akurasi klasifikasi dan confusion matrix sebagai kriteria objektif keberhasilan. Hasil penelitian menunjukkan bahwa semua model berhasil mencapai MSE di bawah 10⁻⁵ dan akurasi 100% pada data uji, yang mengindikasikan tingkat kesalahan sangat rendah. Model berbasis wavelet Haar menunjukkan efisiensi pelatihan terbaik dengan jumlah epoch paling sedikit. Oleh karena itu, kombinasi ini sangat direkomendasikan untuk aplikasi pemantauan kualitas daya
Peningkatan Kualitas Keamanan di Pondok Pesantren Khairul Ummah Pekanbaru Melalui Pembuatan Penerangan Berteknologi Surya dan LED Suwitno; Fri Murdiya; Ari Sandhyavitri; Iswadi Hasyim Rosma
Jurnal Pengabdian UntukMu NegeRI Vol. 6 No. 2 (2022): Pengabdian Untuk Mu negeRI
Publisher : LPPM UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jpumri.v6i2.3985

Abstract

Melalui kegiatan pengabdian kepada masyraakat skema kemitraan, dosen Fakultas Teknik bersinergi dengan kegiatan Kukerta mahasiswa Universitas Riau melakukan program penambahan sistem penerangan di akses gerbang masuk dan keluar serta lingkungan Masjid yang sebelumnya redup. Direncanakan penerangan lsitriknya menggunakan lampu led berteknologi sel surya yang tingkat pencahayaan sesuai ketentuan Direktorat Jendral Bina Marga dan Pembinaan Jalan Kota sebesar 11-20 Lux. Untuk memenuhi kriteria tersebut dipilih sistem penerangan dengan tinggi tiang menyangga solar panel 6 meter, lampu led 60 W, dan daya solar panel 60 WP, dengan jangkauan penerangan dari titik bawah lampu radius 6 meter. Selama kegiatan proses pemasangan lampu penerangan yang dimulai dengan penggalian tanah untuk pondasi tiang penyangga, merakit solar panel 60 WP denganlampu LED 60 W, mendirikan tiang dan pengecor pondasi terlaksana dengan baik. Hasil pengukuran tingkat pencahayaan lampu dari titik bawah lampu radius 6 meter diperoleh 11 lux – 28 lux. Ini menunjukkan pemasangan lampu LED 60 W dengan catu daya solar panel 60 Wp dengan ketinggian lampu 7meter dari permukaan tanah menghasilkan tingkat pencahayaan yang sangat baik
Peningkatan Suasana Akademis dalam Menghafal Al-Quran pada Malam Hari Di Gazebo Pondok Pesantren Menggunakan Lampu LED Berbasis Teknologi Sel Surya Suwitno; Iswadi Hasyim Rosma; Murdiya, Fri; Sandhyavitri, Ari; Dian Yayan Sukma; Nurhalim; Firdaus
Jurnal Pengabdian UntukMu NegeRI Vol. 9 No. 2 (2025): Pengabdian Untuk Mu negeRI
Publisher : LPPM UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jpumri.v9i2.9132

Abstract

Khairul Ummah 2 Islamic Boarding School, located on Jalan Gajah, Bambu Kuning Village, Tenayan Raya District, Pekanbaru City, is equipped with facilities such as a mosque, madrasah office, teachers’ housing, dormitories, gazebos, and learning spaces. However, lighting in the gazebo area is still inadequate, limiting its use at night. Through this community service project, a solar-powered lighting system was designed and installed to support nighttime activities, particularly Qur’an memorization. The system includes a 12V 30Ah battery module, a 12V–24V 30A solar charge controller (SCC), 12V 30-watt LED lamps, and a 100 Wp solar panel mounted on the gazebo roof. During the day, the battery is charged via the solar panel, and at night it powers the lamps. Four lighting units were installed and donated to the school. Post-installation, light intensity was measured using a fluxmeter, yielding results between 173–245 lux. This range complies with Indonesian National Standard (SNI 03-6575-2001), which recommends 120–250 lux for reading or working areas. The lighting system is expected to enhance the comfort of students’ nighttime activities, particularly Qur’an memorization, which is more effective in a calm and relaxed evening environment.
Studi Koordinasi Proteksi Arus Lebih Fasa Dan Gangguan Tanah Pada Jaringan Distribusi Berbasiskan Digsilent Powerfactory Putra, Randy; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Distribution Network is one of the parts in a power system that has an important role because it deals directly with users, especially the users of medium and low voltage level. Therefore it needs a protection system against abnormal condition to maintain the reliability of the system. The protective equipment analyzed in this article is the overcurrent relay (OCR) and ground fault relay (GFR). The aim of the article is to determine the settings of OCR and GFR protection devices. By calculating the short circuit, the current and time settings of OCR and GFR can be determined. The short circuit current was simulated by using DigSILENT PowerFactory. It has been found from the results that time setting is influenced by value of short circuit current. The higher the fault current the the faster the trip time of the protection devices. Keywords: Short Circuit, Protection, Relay Setting, DigSILENT
Analisis Ketersediaan Sistem Pembangkit Berbasiskan Pembangkit Listrik Tenaga Angin (PLTB) Dan Pembangkit Listrik Tenaga Surya (PLTS) Desrizal, Herki; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The increasing need for energy and the depletion of petroleum reserves forces people to seek alternative energy sources. Based on the above problems it is necessary to analyse of the availability of generating systems to generate electrical energy pekanbaru city. This study uses a HOMER simulation consisting of Solar Cell (PV), Wind, and Converter. Simulation results of the highest availability of solar energy at 12.00 for 3.86 kw, and wind energy at 16.00 for 3.79 kw.for grouping of the potential winds are in group II that is locations with an average wind speed of 2,5 – 4 m/s. the resulting solar energy can be used for small scale electrical energy conversion system.Design of wind turbine (PLTB) and solar power plants the most optimal based on net present cost of $ 53.18 and cost of energy (COE) amount 506.$/kWh. In terms of its economy, the greater the installed renewable energy capacity, will decrease fuel usage levels and cost incurred.Keywords: PV, Wind, renewable energy, HOMER, Optimazation, Sensitivity, Availability
Analysis Of Configuration And Performance Of Arrester For Protecting Substation Against Impulse Lightning Using ATP-EMTP Software Adri, Alfian; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Electrical energy is one of the most important and often used energy in life. Therefore to keep the availability of electricity, it takes a power company that will manage the electricity needs. One of the things that affect to the reliability of the equipment is need to know the configuration of the electrical equipment protective device. As known that transmission line is very vulnerable to lightning strikes that produce a traveling wave. It can enter the substation and make the existing equipment in danger. Based on the problems we need to analyze the configuration and performance of the arrester against the impulse lightning. This study was conducted by simulating lightning strikes on equipment using ATP-EMTP software by varying the strike and the distance of the arrester protection for protected transformer in order to get the correct distance to minimize the optimum voltage. The result of the simulation by varying the distance from 3 m, 6.7 m, 9 m, 15 m, 21 m, 27 m, 28.5 m, the safer distance and the smaller peak voltage which is protected by the arrester to the transformer is 21 meters from the current variation at 10 kA, 30 kA, and 60 kA where the lowest peak voltage of phases A, B, and C are compared with other distances. Then the distance 21 m better than the distance of 6.7 m used by PT.PLN (Persero) Garuda Sakti Substation.Keywords: Arrester, ATP-EMTP, Arrester configuration.
Proteksi Panas lebih Pada Generator Berbasiskan Smart Relay Abdullah, Azmi; Hasyim Rosma, Iswadi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

One of abnormal conditions that may happen when operating synchronous generator is overheating at armature winding. Therefore, this condition is needed to overcome to avoid further damage in the generator by designing and implementing smart relay based overheating protection. Temperature at armature winding is as an input of the smart relay where it was measured by using LM35DZ sensor. Magnetic contactor was used as switch, where it will open when the temperature higher then setting value. The overheat protection design was implemented successfully where it can trip (disconnect generator from the system by opening magnetic contactor) when the armature winding temperature is higher than 60° C.Keyword: Synchronous generator, armature winding, Smart Relay, Temperature Sensor, Zelio Soft 2
Co-Authors A. Ludfi Nur Kasan A. U. Lawan Abdul Gafar Arsaf Abdul Gafar Arsaf Abdul jalil, Feranita Abdullah, Azmi Abubakar Abdulkarim Abubakar Abdulkarim Adamu Halilu Jabire Adri, Alfian Agus Ika Putra Agus Ika Putra Agus Wahyudi Ahmad Jamaan Alfian Adri Ali, Nurhalim Dani Ali, Nurhalim Dani Ali Amanda Khaira Perdana Amir Hamzah Amir Hamzah Anhar Anhar Anisa Yulvi Azni Antonius Rajagukguk Antonius Rajagukguk, Antonius Ari Sandhyavitri Ari Sandhyavitri Arisman Adnan Arsaf, Abdul Gafar Azmi Abdullah Azriyenni Azhari Zakri Boy Ihsan Burhan, Hidayatul Catra Dani Ali, Nurhalim Dansarki Nanly Wesley Demiza, Khosfikra Desrizal, Herki Dian Yayan Sukma, Dian Yayan Dicky Rinaldi Dicky Yulvarizal Dohardo P H Simanullang Edy Ervianto Ery Safrianti Fahmi, Ziddan Fajar Restuhadi Fakhriyah, Salsabila Fathir Juliando Feblil Huda Feblil Huda Febrizal Ujang Fera Gustia Handayani Feranita Feranita Feranita Ferdian, Fhinta Syahila Ferdy Ultra Sony Firdaus Firdaus Firdaus Fri Murdiya, Fri Ginting, Yogie Rinaldy Hanifa, Muhammad Riski Harahap, Elco Maghfira Arfi Harahap, Muhammad Nasir Herki Desrizal Hidayatul Catra Burhan Hutabarat, Bijujent I.S. Madugu Ibrahim, Sajid Ichsan Maulana Putra Jamarrintan Jamarrintan Jikro Pikri Juandi Juandi Linna Oktaviana Sari Lysbetti Marpaung, Noveri Mahindra, Syaputra Dwi Marpaung, Horas Muhammad Riski Hanifa Muhammad, Satyo N. Nazaruddin Nasir Faruk Noveri Lysbetti M Nurhalim Nurhalim Dani Ali Nurhalim Nurhalim, Nurhalim P.U. Okorie Putra, Randy Ramadhan, Roza Syahputra Ramandana, Ranto Randy Putra Ranto Ramandana Rinaldi, Dicky Romy Romy Rosiki, Muhammad Habib Rusdi Masri S, Rocky Samuel Sakti Hutabarat Sani Saminu SARE, SATRIA Satibi, Syawal Siregar, M. Ikhsan Sobhy Abdelkader Soewignjo Agus Nugroho Solihin, Ikhram Minata Suwitno Suwitno Suwitno, Suwitno Suwitno1, Suwitno Suwondo Suwondo SYAIFUL BAHRI Tsabitul Khair Valendino, Muhammad Wallsman Lamtota Nainggolan Winanda, Muhammad Valdi Wiwik Handayani Yoga Pratama Yusni Ikhwan Siregar