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All Journal TEKNIK KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Department of Naval Architecture Sinergi INOVTEK POLBENG Warta Penelitian Perhubungan International Journal of Marine Engineering Innovation and Research Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Kolaborasi Jurnal Pengabdian Masyarakat Indonesian Journal of Maritime Technology or abbreviated (ISMATECH) Warta Penelitian Perhubungan
Andi Trimulyono
Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Transportation

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Analysis of empirical method for predicting maneuverability of ultra-large container ship using Maneuvering Modelling Group (MMG) model Zeinurrohman, Rangga; Trimulyono, Andi; Wicaksono, Ardhana; Hadi, Eko Sasmito; Samuel, Samuel; Hakim, Muhammad Luqman; Purwanto, Dedi Budi
SINERGI Vol 28, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.2.016

Abstract

International Maritime Organization (IMO) provided manoeuvrability standards for all ships above 100 m to ensure the ship's safety and surroundings. In the preliminary design stage, one way to ensure a ship's manoeuvrability under IMO standards is to use empirical methods that are cheaper and less time-consuming than model tests. Empirical methods used analysis regression to develop their formula from the model test result database, and their formula depends on ship hull parameters and dimension ratios such as , , , and . However, the database of the existing empirical formulas is limited to small-medium merchant ships and fishing vessels, as consequences for larger ships are inaccurate and have a significant error in predicting ship manoeuvres. This study modified the existing empirical formulas by adding specified ship data into the existing database and analyzing the accuracy of predicting ship manoeuvres using the Maneuvering Modelling Group (MMG) model. We verify by adding the selected ship data into the existing database, which shows improvement in predicting ship manoeuvres. The modified formulas show improvement by only giving 5% RMSE of tactical diameter and 3% RMSE of ship advance in turning manoeuvre, and this is a 78% overall improvement in predicting the turning motion of ultra-large container ships compared to previous formulas. The quantitative and qualitative produce better estimation result that indicates the right track to derive the empirical formulas for Ultra-Large Container ships.
Evaluasi Karakteristik Deep-v Planing Hull Dengan Menggunakan Metode Moving Grid Mesh Samuel, Samuel; Iqbal, Muhammad; Trimulyono, Andi; Purwanto, Dedi Budi; Ariani, Betty
Warta Penelitian Perhubungan Vol. 34 No. 1 (2022): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/warlit.v34i1.1591

Abstract

Karakteristik Deep-v planing hull sangat dipengaruhi oleh bentuk dan kecepatan kapal. Bentuk pada haluan kapal akan mempengaruhi performance kapal pada saat kondisi air tenang dan gelombang. Semakin tinggi kecepatan kapal maka akan semakin sulit untuk memprediksi karakteristik kapal tersebut. Pada penelitian ini akan menggunakan pendekatan Computational Fluid dynamic (CFD) dengan menggunakan metode moving grid mesh untuk mengevaluasi karakteristik kapal pada saat kondisi air tenang dan gelombang regular. Perhitungan numerik menggunakan persamaan RANS (Reynolds-Averaged Navier-Stokes) dengan model turbulensi k-ε untuk memprediksi aliran turbulen. Hasil simulasi pada kondisi air tenang hambatan menunjukkan trend yang baik pada kecepatan rendah, sementara pada kecepatan tinggi ada perbedaan yang signifikan. Pada kondisi gelombang regular hasil simulasi numerik masih perlu pendekatan yang lebih baik.
Strength Evaluation of Combined New and Old Plates Welded Joint: Case of Anggada XV Tug Boat Nurcholik, Samsu Dlukha; Wahyuda, Wahyuda; Hidayat, Taufik; Arifuddin, Andi Mursid Nugraha; Kurniawati, Diniar Mungil; Saadiyah, Devy Setiorini; Awali , Jatmoko; Rohimsyah, Fikan Mubarok; Trimulyono, Andi; Kusuma, Andhi Indira
Indonesian Journal of Maritime Technology Vol. 2 No. 1 (2024): Volume 2 Issue 1, June 2024
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v2i1.1069

Abstract

Naval grade plate is designed for shipbuilding due to its strength. In the shipyard, old plates have been used because surplusage of the previous project. However, the mechanical properties of old plate compared to new plate have not been clarified yet. In this study, a comparative investigation shielded metal arc welding (SMAW) of old plate and new plate was performed. A spectroscopy test was used to obtain the chemical properties of the old plate and the new plate. Furthermore, tensile and hardness tests were performed to investigate the mechanical properties It was concluded that (1) the chemical properties of the old and new plates are almost similar and (2) the average value of tensile strength of the old-old plate, new-new plate, and new-old plate are 451.3, 487, 454,3 N/mm2, respectively. (3) then, the average hardness test of HAZ of old plate, new plate, and weld metal are 73.2, 78.3, 83.2 HRB, respectively. From the results, it can be concluded that using old plates for shipbuilding is still reliable.
Pemeriksaan Kesehatan Gratis sebagai Upaya Deteksi Dini Penyakit Tidak Menular di Komunitas Asna, Alfi Fairuz; Trimulyono, Andi; Kurrohman, Faik; Adietya, Berlian Arswendo; Hanyfah, Dewinta Roebiyana; Farhana, Annisa; Syafrillia, Dewi; Safitri, Laela; Weslee, Chalvin; Alviskarahma, Keizha
Kolaborasi: Jurnal Pengabdian Masyarakat Vol 5 No 5 (2025): Kolaborasi: Jurnal Pengabdian Masyarakat
Publisher : Yayasan Inspirasi El Burhani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56359/kolaborasi.v5i5.633

Abstract

Introduction: Non-communicable diseases (NCDs) are the most significant global public health challenge, significantly impacting both developed and developing countries. The results of the 2023 Indonesian Health Survey (SKI) indicate that NCDs such as diabetes mellitus, heart disease, and hypertension remain a major issue in Indonesia and Central Java Province.  Early detection of NCD risks through blood sugar, blood pressure, uric acid, and cholesterol level tests plays a crucial role in preventing and managing these chronic conditions. Objective: This community service activity aims to support NCD prevention efforts at the local level, particularly in Central Java, by involving the community in early detection programmes and promoting healthy behaviours. Method: This community service activity was carried out in June 2025 in Geneng Village, Demak, using a participatory method involving active community engagement. The program consisted of planning, health examinations, health education, and follow-up. A total of 51 participants from the productive and elderly age groups underwent health checks including blood pressure, blood glucose, uric acid, and cholesterol using standardized tools. The results were recorded, interpreted according to the Ministry of Health categories, and delivered to participants along with education on healthy lifestyles, such as dietary modifications, physical activity, and routine health monitoring. Data were analyzed descriptively and the results were also submitted to the local Public Health Center as input for non-communicable disease prevention programs. Result: The screening showed that 57.7% of respondents had high blood pressure, 13.04% had high blood sugar, 53.5% had high cholesterol, and 13.9% had high uric acid. These four types of screening can serve as important indicators and play a strategic role in the early detection of Non-Communicable Diseases (NCDs), enabling health interventions to be implemented in a timely and appropriate manner to prevent further complications. Respondents were then provided with an explanation of their screening results, including an interpretation of the health check results and recommendations for a healthy lifestyle. Conclusion: The conclusion from this community service activity is that some respondents still have hypertension, abnormal blood sugar levels, high uric acid, and high cholesterol.
PEMBERDAYAAN UMKM SANGGUL DI DESA GENENG MELALUI PEMBUATAN WEBSITE SEBAGAI MEDIA PROMOSI DIGITAL Ramadhani, Wahyu; Yahdun, Finodya; Trimulyono, Andi; Asna, Alfi Fairuz; Adietya, Berlian Arswendo
Jurnal Pasopati Vol 7, No 2 (2025): Vol 7, No 2 (2025)
Publisher : Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/pasopati.2025.28946

Abstract

Perkembangan teknologi digital membawa dampak besar pada berbagai aspek kehidupan, termasuk sektor usaha mikro, kecil, dan menengah (UMKM). Namun, banyak UMKM di desa masih mengalami keterbatasan dalam mengakses teknologi informasi sehingga membutuhkan pendampingan dan inovasi untuk meningkatkan daya saing. Desa Geneng, Kabupaten Klaten, memiliki potensi produk unggulan berupa sanggul tradisional yang dikelola oleh para pengrajin lokal. Selama ini, pemasaran produk sanggul masih terbatas secara konvensional dan bergantung pada jaringan dari mulut ke mulut, sehingga kurang optimal menjangkau pasar yang lebih luas. Program pengabdian masyarakat ini bertujuan untuk mendukung digitalisasi UMKM melalui pembuatan dan pendampingan website berbasis komunitas yang mudah digunakan oleh pengrajin sanggul. Kegiatan dilakukan melalui pendekatan partisipatif, meliputi pelatihan dasar penggunaan website, pembuatan konten produk, hingga strategi pemasaran digital sederhana. Hasil program menunjukkan peningkatan pemahaman pelaku UMKM tentang pentingnya media digital serta kemampuan dasar dalam memanfaatkan website sebagai sarana promosi. Walaupun masih terdapat kendala berupa keterbatasan literasi digital dan ketersediaan perangkat, antusiasme masyarakat cukup tinggi. Dengan adanya program ini, diharapkan UMKM sanggul di Desa Geneng dapat memperluas jangkauan pemasaran, meningkatkan nilai jual produk, serta membangun identitas digital yang berkelanjutan untuk mendukung kemandirian ekonomi desa. Kata Kunci: UMKM, website, pemberdayaan, promosi digital, Desa Geneng.
Analisis Pengaruh Jumlah Bilge Keel terhadap Gerakan Rolling pada Kapal Patroli 14 m Widyatmoko, Ari; Samuel, Samuel; Manik, Parlindungan; Trimulyono, Andi
Warta Penelitian Perhubungan Vol. 33 No. 1 (2021): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/warlit.v33i1.1667

Abstract

AbstrakKapal Patroli merupakan kapal yang memiliki ukuran yang relatif kecil, namun memiliki kecepatan yang cukup tinggi. Bentuk kapal yang kecil akan berpengaruh terhadap gerakan rolling kapal, sehingga menarik untuk dibahas secara mendalam pengaruh pemasangan bilge keel terhadap gerakan kapal. Penelitian ini akan menganalisis pengaruh bilge keel yang ditambah jumlahnya menjadi 2 pasang dan 3 pasang terhadap efek gerakan rolling kapal agar dapat memperbaiki performa kapal menjadi lebih baik. Model kapal patroli yang telah didesain akan dianalisis menggunakan metode BEM (Boundary Element Method) yang terintegrasi untuk mendapatkan nilai rolling pada setiap model yang dianalisis. Pada penelitian ini, didapatkan kesimpulan bahwa penambahan jumlah bilge keel akan menambah RMS rolling sebesar 11-50% pada kecepatan rendah, namun dapat mengurangi RMS rolling sebesar 7-28% pada kecepatan tinggi.Kata kunci: Bilge Keel, Kapal Patroli, Olah Gerak Kapal, Rolling.AbstractA Study on the Effects of Bilge Keel Number on 14 m Patrol Boat’s Rolling Motion: Patrol boats can move at such high speed despite their relatively small size. This relatively small size will affect its rolling motions, hence the effect of bilge keel installation on ship motions is an interesting topic to discuss. In this study, the effect of adding bilge keel pair to 2 and 3 pairs of bilge keel on ship’s rolling motions was studied so that the ship’s performance becomes more optimal. The patrol boat model that had been designed was studied using integrated BEM (Boundary Element Method) to obtain each model’s rolling value. This study concluded that the addition of installed bilge keel pairs increased RMS rolling by 11-50% on low speed, but it reduced 7-28% RMS rolling at high speed.Keywords:  Bilge Keel, Patrol boats, Ship motions, Rolling.
PENANAMAN BIBIT MANGROVE DI PESISIR PANTAI BATANG GUNA PENANGGULANGAN ABRASI Santosa, Ari Wibawa Budi; Amiruddin, Wilma; Chrismianto, Deddy; Zakki, Ahmad Fauzan; Trimulyono, Andi; Budiarto, Untung; Hadi, Eko Sasmito; Iqbal, Muhammad
Jurnal Pasopati Vol 6, No 2 (2024): Vol 6, No 2 (2024)
Publisher : Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/pasopati.2024.25171

Abstract

Kabupaten Batang merupakan salah satu kabupaten yang berada di pesisir pantai dari Laut Jawa. Letaknya di pesisir sehingga Kabupaten Batang juga terkena dampak dari abrasi pantai. Abrasi pantai merupakan pengikisan yang disebabkan oleh air lau dan apabila tidak segera ditanggulangi akan menghabiskan wilayah daratan. Oleh sebab itu perlu dilakukannya penanggulangan dengan penanaman bibit mangrove. Tujuan dari adanya penanaman mangrove adalah sebagai upaya penanggulangan terjadinya abrasi pantai. Penanaman 1000 Bibit Mangrove dilakukan di Perairan pesisir Desa Sekarsari, Kecamatan Batang, Kabupaten Batang. Penanaman dilakukan pada Hari Jumat, 14 Juli 2017 oleh Tim KKN PPM Temati Kec. Batang, SIBAT, dan perwakilan dari PMI daerah setempat. Metode yang dilakukan adalah dengan menanam bibit langsung ke dalam perairan kemudian menempelkan dengan ajir (bambu penyangga tanaman bibit mangrove baru tanam). Hasilnya adalah dengan ditanamnya bibit mangrove telah dilakukan satu upaya pencegahan terhadap abrasi pantai.Kata kunci : Abrasi pantai, Bibit mangrove, Kabupaten Batang
Evaluasi Karakteristik Deep-v Planing Hull Dengan Menggunakan Metode Moving Grid Mesh Samuel, Samuel; Iqbal, Muhammad; Trimulyono, Andi; Purwanto, Dedi Budi; Ariani, Betty
Warta Penelitian Perhubungan Vol. 34 No. 1 (2022): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/warlit.v34i1.1591

Abstract

Karakteristik Deep-v planing hull sangat dipengaruhi oleh bentuk dan kecepatan kapal. Bentuk pada haluan kapal akan mempengaruhi performance kapal pada saat kondisi air tenang dan gelombang. Semakin tinggi kecepatan kapal maka akan semakin sulit untuk memprediksi karakteristik kapal tersebut. Pada penelitian ini akan menggunakan pendekatan Computational Fluid dynamic (CFD) dengan menggunakan metode moving grid mesh untuk mengevaluasi karakteristik kapal pada saat kondisi air tenang dan gelombang regular. Perhitungan numerik menggunakan persamaan RANS (Reynolds-Averaged Navier-Stokes) dengan model turbulensi k-ε untuk memprediksi aliran turbulen. Hasil simulasi pada kondisi air tenang hambatan menunjukkan trend yang baik pada kecepatan rendah, sementara pada kecepatan tinggi ada perbedaan yang signifikan. Pada kondisi gelombang regular hasil simulasi numerik masih perlu pendekatan yang lebih baik.
Analisis Pengaruh Jumlah Bilge Keel terhadap Gerakan Rolling pada Kapal Patroli 14 m Widyatmoko, Ari; Samuel, Samuel; Manik, Parlindungan; Trimulyono, Andi
Warta Penelitian Perhubungan Vol. 33 No. 1 (2021): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/warlit.v33i1.1667

Abstract

AbstrakKapal Patroli merupakan kapal yang memiliki ukuran yang relatif kecil, namun memiliki kecepatan yang cukup tinggi. Bentuk kapal yang kecil akan berpengaruh terhadap gerakan rolling kapal, sehingga menarik untuk dibahas secara mendalam pengaruh pemasangan bilge keel terhadap gerakan kapal. Penelitian ini akan menganalisis pengaruh bilge keel yang ditambah jumlahnya menjadi 2 pasang dan 3 pasang terhadap efek gerakan rolling kapal agar dapat memperbaiki performa kapal menjadi lebih baik. Model kapal patroli yang telah didesain akan dianalisis menggunakan metode BEM (Boundary Element Method) yang terintegrasi untuk mendapatkan nilai rolling pada setiap model yang dianalisis. Pada penelitian ini, didapatkan kesimpulan bahwa penambahan jumlah bilge keel akan menambah RMS rolling sebesar 11-50% pada kecepatan rendah, namun dapat mengurangi RMS rolling sebesar 7-28% pada kecepatan tinggi.Kata kunci: Bilge Keel, Kapal Patroli, Olah Gerak Kapal, Rolling.AbstractA Study on the Effects of Bilge Keel Number on 14 m Patrol Boat’s Rolling Motion: Patrol boats can move at such high speed despite their relatively small size. This relatively small size will affect its rolling motions, hence the effect of bilge keel installation on ship motions is an interesting topic to discuss. In this study, the effect of adding bilge keel pair to 2 and 3 pairs of bilge keel on ship’s rolling motions was studied so that the ship’s performance becomes more optimal. The patrol boat model that had been designed was studied using integrated BEM (Boundary Element Method) to obtain each model’s rolling value. This study concluded that the addition of installed bilge keel pairs increased RMS rolling by 11-50% on low speed, but it reduced 7-28% RMS rolling at high speed.Keywords:  Bilge Keel, Patrol boats, Ship motions, Rolling.
Analysis of the Effect of Voltage and Zinc Plating Duration on Low Carbon Steel A36 by Electroplating Process on Corrosion Rate Ari Wibawa Budi Santosa; Agil Arianda Alkhudry; Untung Budiarto; Eko Sasmito Hadi; Andi Trimulyono
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 2 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.4974

Abstract

Corrosion is a significant issue in steel constructions, and zinc coating (electroplating) is one of the methods used to protect steel from corrosion. This research aims to analyze the effect of voltage and duration of zinc coating on low carbon steel A36 through the electroplating process on the corrosion rate and coating thickness. An experimental method was employed, varying the voltage (6, 8, and 10 Volts) and coating duration (10, 20, and 30 minutes) during the electroplating process using a ZnO solution. The corrosion rate was tested electrochemically in a 3.5% NaCl solution. The results showed a significant correlation between voltage, coating duration, corrosion rate, and coating thickness. Higher voltages and longer durations produced thicker zinc coatings and reduced the corrosion rate. The optimal conditions were found at 10 Volts for 30 minutes, producing a 160 (Mu)m thick coating and the lowest corrosion rate of 0.00318 mmpy. The minimal coating condition, 6 Volts for 10 minutes, resulted in a 30 (Mu)m thick coating and a corrosion rate of 0.050120 mmpy.
Co-Authors A.F. Zakki Agil Arianda Alkhudry Agus Setyawan Ahmad Fauzan Zakki Ahmad Firdhaus Al Ma'rif, La Ode Muh. Ayi Alfaruqi, Malik Alfi Fairuz Asna Alif Fauzan Rachmat Alvianto, Jodhy Irsyad Alviskarahma, Keizha Andy Wibowo Ari Wibawa B.S Ari Wibawa Budi Santosa Ari Wibawa Budi Santosa Ari Widyatmoko Arifuddin, Andi Mursid Nugraha Ariq Fadhlurrahman Rahardjo Ashoka Wira Parama Arta Awali , Jatmoko Azis Anjas Nugroho, Azis Anjas Aziz Abdurohman Bahtiar, Muhammad Hafids Bandi Sasmito Benny Syahputra Berlian Arswendo A Berlian Arswendo Adietya Betty Ariani Burhanuddin Putra Nirwana Daviensya Giovancha Anabel Malingkas Deddy Chrismianto Deddy Chrismianto Dedi Budi Purwanto Desto Pradika Putra Eko Didik Purwanto, Eko Didik Eko Sasmito Hadi Eko Sasmito Hadi Farhana, Annisa Firnandito, Anugrah Gary Simon good rindho Good Rindo Hafizh, Muhammad Nur Abdullah Hanyfah, Dewinta Roebiyana Hanzallahh, Muhammad Thareq Fajri Hartono Yudo Herbet Simbolon Hutabarat, Marcelino Gabriel Ignasius Sihotang Ilham Abror Imam Pujo Mulyatno Imam Pujo Mulyatno Iqbal, Muhammad Faiq Jatmiko, Arif Budi Kiryanto Ananda Kiryanto Kiryanto Kiryanto Kiryanto Kurniawati, Diniar Mungil Kurrohman, Faik Kusuma, Andhi Indira Luthfi Maslul Muttaqim M. Angger Kalingga M. Nurul Hidayat M. Ulil Anwar Mc. Fazjeri Ubaidilah Moh. Resi Trimulya S Muhamad Angger Kalingga Muhammad Fajar Nuralam Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Iqbal Muhammad Luqman Hakim, Muhammad Luqman Musfar, Rafi Faiqal Mustofa, Dandy Ali Nadhila Shabrina Riyanto Nadzirun Bin Basir, Nadzirun Bin Nanang Zarma Nico Dwiprasti Anando Nurul Huda Nyawa, Dewa Anjar Ocid Mursid Ocid Mursid Ocid Mursid Parlindungan Manik Parlindungan Manik Purnawan Adi Wicaksono Putra, Rico Ade Rifat Al Farid Riyanto, Nadhila Shabrina Rohimsyah, Fikan Mubarok Ryan Andriawan Ryan Andriawan S. Samuel Saadiyah, Devy Setiorini Safitri, Laela Sam Timoty Frans Evan S. Samsu Dlukha N Samuel Samuel . Samuel Febriary Khristyson Samuel Febriary Khristyson Samuel Samuel Samuel Samuel Samuel, S Sarjito Joko Sisworo Sarjito Joko Sisworo Septyawan Bintar Saputra Solikhin Solikhin Subekti, Joko Sukanto Jatmiko Susatyo, Fadhly Aldilas Syafrillia, Dewi Syahab, Husein Syaiful Tambah Putra Ahmad Syaiful Tambah Putra Ahmad Taufik Hidayat Taufiq Hidayah Theonov S Nainggolan Untung Budiarto Untung Budiarto Wahyu Ananda Wahyu Dwi Yunanto Wahyu Masykuri Al Hakim Wahyu Ramadhani, Wahyu Wahyu Wibowo Wahyuda, Wahyuda Wasisto Rakhmadi Weslee, Chalvin Wicaksono, Ardhana Widjaja, Raden Sjarief Widya Rahman Fitriadi Widyatmoko, Ari Wilma Amiruddin Yahdun, Finodya Yohanes Aditya Yudhistira Dwi Putra Yupiter, Frengki Zaenal Abidin Zeinurrohman, Rangga