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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut TEKNIK Rotasi JURNAL TEKNIK MESIN Semantik TELKOMNIKA (Telecommunication Computing Electronics and Control) Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Prosiding SNATIF Jurnal NERS Majalah Ilmiah MOMENTUM Jurnal Rekayasa Mesin Proceeding of the Electrical Engineering Computer Science and Informatics Jurnal Keperawatan Silampari Medica Hospitalia Jurnal Konversi Energi dan Manufaktur Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Teknomekanik Jurnal Rekayasa Energi dan Mekanika Automotive Experiences IJEE (International Journal of Engineering Education) Journal of Biomedical Science and Bioengineering Journal of Mechanical Engineering and Applied Technology Advance Sustainable Science, Engineering and Technology (ASSET)
Rifky Ismail
Department Of Mechanical Engineering, Diponegoro University, Jl. Prof. Soedarto, Tembalang, Kec. Tembalang, Kota Semarang, Jawa Tengah 50275.
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Analisis Parameter Fisik Filamen Biokomposit PLA PCL HA Hasil Proses Ekstrusi Hidayat, Wahyu; Bayuseno, Athanasius Priharyoto; Ismail, Rifky; Fitriyana, Deni Fajar; Cionita, Tezara; Prawibowo, Hartanto
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.27-32

Abstract

Penelitian ini berfokus pada tantangan implan logam yang memerlukan operasi kedua, serta risiko infeksi, peradangan, dan korosi yang mungkin terjadi di dalam tubuh. Untuk mengatasi masalah tersebut, penelitian ini mengembangkan material biokomposit yang terdiri dari PCL (Polycaprolactone), PLA (Polylactic Acid), dan Hidroksiapatit (HA), yang dapat terbiodegradasi secara alami di dalam tubuh. Sistem yang diusulkan mampu meningkatkan kontrol pengguna secara signifikan, serta menjadi fondasi untuk sistem kontrol lengkap dalam pembuatan filamen biodegradable. Hal ini dilakukan dengan mengatur parameter motor untuk mencapai diameter filamen yang konsisten dengan deviasi minimal serta mengontrol laju ekstrusi pada printer guna memperbaiki ketidakstabilan filamen.Penelitian ini juga akan membandingkan filamen yang dihasilkan dengan filamen komersial PLA merek SUNLU. Perbandingan tersebut meliputi evaluasi parameter fisik seperti ukuran diameter hasil ekstrusi, densitas filamen setelah penambahan PCL dan HA, serta apakah penampang filamen membentuk lingkaran sempurna. Hasil dari penelitian ini akan memberikan wawasan lebih dalam tentang kualitas fisik filamen yang dihasilkan.
Vapor compression refrigeration system with air and water cooled condenser: Analysis of thermodynamic behavior and energy efficiency ratio Setiyo, Muji; Rusdjijati, Retno; Habibi, Ilham; Rochman, Muhamad Latifur; Purnomo, Bagiyo Condro; Pertiwi, Fungky Dyan; Waluyo, Budi; Ismail, Rifky; Kolakoti, Aditya
Teknomekanik Vol. 7 No. 2 (2024): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v7i2.31972

Abstract

This study presents the analysis of thermodynamic behavior and energy efficiency of a vapor compression refrigeration system with two types of condensers: air-cooled (ACC) and water-cooled (WCC). The main objective is to assess the system performance by comparing the Coefficient of Performance (COP) and Energy Efficiency Ratio (EER) under both condenser configurations. During a 12-hour test period, data on refrigerant pressure, temperature, and electrical energy consumption were collected and analyzed. The results show that the WCC system outperforms the ACC system, showing a 5.7% increase in heat rejection and a 4.2% increase in cooling capacity. In addition, the WCC system exhibits a lower compressor duty cycle and consumes less electrical energy, resulting in a higher total EER of 5.658 compared to ACC of 1.945. These findings suggest that integrating a water-cooled condenser into a refrigeration system can significantly improve energy efficiency and reduce operating costs, making it a viable option for commercial applications in tropical regions.
Computational Assessment of Orthopedic Implant Durability Using Finite Element Analysis Haryanto, Ismoyo; Bagastomo, Riondityo Soni; Ismail, Rifky; Siregar, Januar Parlaungan; Cionita, Tezara
Advance Sustainable Science Engineering and Technology Vol. 7 No. 3 (2025): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i3.1977

Abstract

Finite Element Analysis (FEA) provides a rapid and cost-effective method to evaluate orthopedic implants. This research investigates the mechanical performance and long-term durability of a seven-hole SS 316L Basic Fragment Set (BFS) reconstruction plate designed for pelvic fractures. Adhering to ASTM standards, material properties were defined via tensile testing (ASTM E8), while static and fatigue analyses were performed using a displacement control method in a four-point bending test setup in SOLIDWORKS 2024 (ASTM F382). The static analysis predicted failure from plastic deformation at a force of 367 N, with a maximum stress of 621.92 MPa. The fatigue simulation predicted a lifespan of 483,754 cycles. To validate the simulation, these computational results were compared to experimental data, demonstrating high accuracy with deviations of only 3.34% for maximum force and 1.19% for fatigue life. These findings confirm that FEA is a highly reliable tool for predicting mechanical performance, enabling the orthopedic industry to optimize implant designs, enhance patient safety, and improve production efficiency.
Upaya pencegahan sarkopenia melalui edukasi dan pengukuran kekuatan otot pada lansia Mustofa, Rizal; Julianti, Hari Peni; Ismail, Rifky; Priwintoko, Baharudin
Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Vol. 6 No. 3 (2025)
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/jp2m.v6i3.24034

Abstract

Sarkopenia merupakan kondisi degeneratif yang ditandai dengan penurunan massa dan kekuatan otot. Pengabdian ini bertujuan untuk mencegah sarkopenia melalui sosialisasi, edukasi, dan tindak lanjut pengukuran kekuatan otot pada masyarakat lansia di Kelurahan Randusari, Kota Semarang. Metode yang digunakan meliputi edukasi dan skrining kekuatan otot menggunakan alat electromyography sebagai indikator dini risiko sarkopenia. Electromyography merupakan alat ukur kekuatan kontraksi otot yang dapat digunakan untuk mengevaluasi kondisi otot. Proses screening sarkopenia diawali dengan identifikasi gejala melalui kuesioner, dilanjutkan dengan pengukuran kekuatan otot menggunakan electromyography sebagai indikator utama. Jika kekuatan otot menunjukkan nilai di bawah ambang batas, maka dilakukan evaluasi performa fisik, seperti kecepatan berjalan, dilakukan untuk menentukan tingkat keparahan. Berdasarkan hasil pemeriksaan, sarkopenia diklasifikasikan menjadi probable, confirmed, atau severe. Hasil pengabdian menunjukkan peningkatan pemahaman peserta tentang pentingnya pola makan bergizi dan aktivitas fisik rutin, serta terdeteksinya kelompok lansia dengan risiko penurunan fungsi otot yang kemudian diarahkan untuk tindak lanjut intervensi kesehatan. Program ini memberikan dampak positif berupa peningkatan kesadaran pencegahan sarkopenia dan penguatan kapasitas komunitas dalam menjaga kesehatan otot lansia. Rekomendasi pengembangan program ini adalah pelaksanaan monitoring berkelanjutan dan pelibatan lebih luas dari pemangku kepentingan setempat untuk meningkatkan efektivitas pencegahan sarkopenia di masa depan.
Rancang Bangun Alat Uji Dorsifleksi Telapak Kaki Prostesis Berdasarkan Standar ISO 10328 Khafidh, Muhammad; Pratama, Wahyudi; Nurudin, Tri; Suryawan, Donny; Kistriyani, Lilis; Aminah, Siti; Ismail, Rifky
Jurnal Rekayasa Mesin Vol. 18 No. 3 (2023): Volume 18, Nomor 3, Desember 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i3.5127

Abstract

Kaki prostesis merupakan salah satu solusi bagi penderita amputasi kaki. Salah satu bagian kaki prostesis yang penting adalah telapak kaki prostesis yang biasanya terbuat dari elastomer. Saat ini produk telapak kaki prostesis di Indonesia masih didominasi oleh produk impor. Meskipun demikian, produk telapak kaki prostesis juga sudah diproduksi oleh UMKM lokal. Standar pengujian performa telapak kaki prostesis diatur dalam standar ISO 10328. Dalam standar ISO 10328, beberapa pengujian perlu dilakukan untuk mengetahui performa telapak kaki prostesis, salah satunya adalah uji dorsifleksi. Saat ini masih jarang ditemukan alat yang fokus pada pengujian performa produk telapak kaki prostesis. Penelitian ini fokus pada rancang bangun alat uji dorsifleksi untuk telapak kaki prostesis berdasarkan standar ISO 10328. Perancangan alat menggunakan metode morfologi untuk mendapatkan desain terbaik. Hasil perancangan menunjukkan bahwa alat uji dorsifleksi diproduksi dengan mengikuti prosedur ISO 10328 seperti lokasi pembebanan, besar beban, dan kecepatan penekanan. Telapak kaki produk lokal jenis Single Axis Cushion Heel (SACH) digunakan untuk mengetahui performa dari alat uji dorsifleksi yang diproduksi. Pengujian dilakukan dengan tiga kali pengulangan untuk memastikan keberulangan hasil. Sudut dorsifleksi dari spesimen telapak kaki lokal adalah 33,46 °.
ERGONOMIC POSTURE CLASSIFICATION OF BENCH WORK UTILIZING MUSCLE DATA: A CASE STUDY IN EDUCATIONAL WORKSHOP Putri, Farika Tono; Purwati, Wiwik; Margana; Supriyo; Prawibowo, Hartanto; Pasmanasari, Elta Diah; Ismail, Rifky; Kadavi, Fadhil Muhammad; Muryanto
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 2 (2025): VOLUME 3 ISSUE 2 YEAR 2025 (JULY 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i2.6674

Abstract

Occupational musculoskeletal disorders (MSDs) often result from prolonged non-ergonomic postures, especially in educational and industrial bench work activities. This study presents an approach to classify ergonomic and non-ergonomic working postures using surface electromyography (sEMG) signals and machine learning. sEMG data were recorded from four upper limb muscles during simulated bench work conditions. Time-domain and frequency-domain features were extracted from segmented EMG signals using sliding windows. Dimensionality reduction was performed using Principal Component Analysis (PCA), and classification was carried out using logistic regression. The proposed system achieved an overall classification accuracy of 75% in distinguishing ergonomic and non-ergonomic postures. Visualization using PCA and Linear Discriminant Analysis (LDA) showed clear class separation, validating the discriminatory power of the extracted features. While the small sample size and class imbalance were identified as limitations, the study demonstrates that a simple and interpretable model like Logistic Regression, when combined with proper feature engineering, can yield promising results.This work contributes to the development of low-cost, efficient, and interpretable ergonomic assessment tools. It is particularly relevant for vocational and educational environments where real-time posture monitoring and early prevention of MSDs are essential. Future research should focus on expanding the dataset, exploring deep learning methods, and implementing real-time wearable systems.
ANALISIS KINERJA MESIN LASER CUTTING TRULASER 1030 PADA PRODUKSI KENDARAAN KHUSUS MENGGUNAKAN METODE OVERALL EQUIPMENT EFFECTIVENESS (OEE) Fariz Wisda Nugraha; Sendie Yuliarto Margen; Rifky Ismail; Muhammad Farel; Yusuf Subagyo; Hartanto Prawibowo; Rizal Mustofa
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 2 (2025): VOLUME 3 ISSUE 2 YEAR 2025 (JULY 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i2.6761

Abstract

The manufacturing industry is continuously challenged to improve production efficiency and quality. Production machinery plays a crucial role in supporting smooth manufacturing processes, especially in the fabrication of special vehicle components. One such machine is the TruLaser 1030, a 2D laser cutting machine manufactured by TRUMPF, which is used for processing body and accessory parts in special vehicles. This study aims to evaluate the performance of the TruLaser 1030 machine using the Overall Equipment Effectiveness (OEE) method, as well as to identify damaged machine components and maintenance requirements. The Total Productive Maintenance (TPM) approach is applied to enhance equipment effectiveness, prevent breakdowns, and ensure product quality and workplace safety. The OEE methodology involves three main parameters: Availability, Performance Rate, and Quality Rate. The results show the machine’s availability at 94%, performance rate at %, and quality rate at 97.1%. These findings suggest that the TruLaser 1030 machine operates at a relatively optimal level; however, regular evaluations of work systems and maintenance programs are necessary to maintain stable performance and continuously improve productivity.
Wireless stethoscope for auscultation of the heart and lungs in critically ill patients: A systematic review Ismail, Suhartini; Prawira, Ricky; Johan, Andrew; Ismail, Rifky
Jurnal Ners Vol. 18 No. 1 (2023): MARCH 2023
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jn.v18i1.41471

Abstract

Background:Examining the heart and lungs is necessary for critically ill patients, as these individuals may have abnormalities with either or both of these organs. This review systematically determined how the auscultation of the heart and lungs using a wireless stethoscope affected the results. Methods: The research design used was a systematic review following preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines. Databases were searched using the search terms "auscultation," "critical patients," and "stethoscope wireless” and associated MeSH terms. The abstracts of the selected articles were examined independently by two researchers. A systematic search was conducted through several databases (Scopus, PubMed, JSTOR, and Springer-link), which were published from July 2012 to July 2022 .After reading the full content of the included studies, key themes and concepts were extracted and synthesized. Results: In total 142 articles were screened. Five articles met the inclusion criteria and were analyzed. The analysis revealed that wireless stethoscopes have increased sensitivity with indicators capable of diagnosing abnormal auscultation results in patients who have abnormal aucultation results on the gold standard. Three out of five studies suggested that the auscultation of the heart and lungs by wireless stethoscopes are more sensitive, while two other studies stated that wireless stethoscopes have the same sensitivity as manual acoustic stethoscopes. Conclusion: Based on this systematic review, a wireless stethoscope may be more sensitive than an acoustic one. Nevertheless, due to limited studies, a more well-controlled human study is warranted to be done.
Analisis Sifat Mekanis RTV Silicone Rubber dengan Variasi Silicone Oil untuk Pengembangan Injection Training Arm Romadhon, Saeful Rofi; Ismail, Rifky; Bachtiar, Yuriz; Prawibowo, Hartanto
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.30-39

Abstract

RTV silicone rubber is widely used in medical simulation devices because of its properties that resemble human soft tissue, especially in injection training arms that require elasticity, tensile strength, tear resistance, and adequate hardness to withstand repeated needle penetration. This study aims to evaluate the effect of adding silicone oil on the mechanical properties of type 00A RTV silicone rubber through tensile testing (ISO 37:2024), tear testing (ISO 34-1:2022), and hardness testing (ASTM D2240). Three formulations were tested, namely pure RTV, RTV + 5 phr silicone oil, and RTV + 15 phr silicone oil. The results showed that the addition of 5 phr silicone oil produced the most significant improvement in mechanical properties, with a tensile strength of 0.57 N/mm², elongation of 363.4%, tear resistance of 0.42 N/mm, and hardness of 9.3 Shore A, compared to pure RTV which only reached 0.38 N/mm², 199.26%, 0.33 N/mm, and 7.2 Shore A. Conversely, the addition of 15 phr silicone oil reduced performance due to excessive plasticization, although the hardness value still increased to 9.9 Shore A. Thus, the 5 phr silicone oil formulation is recommended as the optimal composition for realistic and economical injection training arm applications.
Influence of Mixing Time on the Hardness and Structure of Local Clay-Based Crucibles Rusiyanto; Rifky Ismail; Athanasius Priharyoto Bayuseno; Daffa Agya Mahardika; Fitriyana, Deni Fajar; Wirawan Sumbodo; Aldias Bahatmaka
Advance Sustainable Science Engineering and Technology Vol. 8 No. 1 (2026): November - January
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i1.2314

Abstract

Although clay crucibles are frequently utilized in regional industries, their inadequate mechanical strength often causes durability issues. This study investigates the influence of mixing duration on the Vickers hardness and macrostructure of crucibles composed of local clay, kaolin, and molasses. The composition was made up of 47.5% clay, 47.5% kaolin, and 5% molasses as a binder, with 15% water added relative to the total weight. Durations of 15, 30, and 45 minutes were evaluated to determine their impact on material qualities. The findings indicated a positive relationship between mixing duration and hardness. At 15 minutes, the mean hardness was 4.1 HV, which escalated to 8.5 HV at 30 minutes and 12.4 HV at 45 minutes. The increased hardness with extended mixing durations indicates a more homogeneous particle dispersion and enhanced bonding among the raw ingredients. The findings suggest that increasing the mixing time can elevate the quality and longevity of locally manufactured crucibles, rendering them more appropriate for small-scale metallurgical applications.
Co-Authors . Jamari . Jamari . Jamari . Sugiyanto Abd. Rasyid Syamsuri Abdul Syakur Abid Muflih Ernandara Abram Ali Sasono Achmaditiya, Galuh Agung Warsito Agustinus Purna Irawan Ahmad, Zakki Kurniawan Akhlis Rahman Nurhidayat Akmal Putra Fardinansyah Aldias Bahatmaka Alfiana Fitri Istiqomah Amrih Prayogo Ananto, Gilar P. Andrew Johan Andromeda, Trias Arifin, Zainal Ariyanto, Mochammad Arvy Yudha Sadewa Atanasius Priharyoto Bayuseno Athanasius Priharyoto Bayuseno Athanasius Priharyoto Bayuseno Athanasius Priharyoto Bayuseno Aulia Salwa Alfaina Bachtiar, Yuriz Bagastomo, Riondityo Soni Bagiyo Condro Purnomo Bayuseno Bayuseno Budi Setiyana Budi Setiyana Budi Setiyana Budi Waluyo Budiman, Rifky Ardiansyah Budy Wiryawan Candratama, Aditya Cionita, Tezara D.J. Schipper Daffa Agya Mahardika Darmanto Deni Mulyana Deni Mulyana Devit Ardiyansyah Dinulloh, Muhammad Rafli Wiratama Dosma Ruben R Nababan Dwi Pudjonarko Dwi Setyawan Egastya Fazal Santoso Eko Saputra Eko Saputra Eko Wahyu Saputro Elga P. Yuandi Eva Hertnacahyani Herraprastansi Fachri Adam Fariz Wisda Nugraha Ferdian Gamalea Delasta Fiki Firdaus Fiki Firdaus Fitriyana, Deni Fajar Friady Gumilar Fungky Dyan Pertiwi Gilar P. Ananto Gunawan Dwi Haryadi Gusti Andika Ramadanu Haira, Mahmuda Hanif Nur Kholid Hari Peni Julianti Hartanto Prawibowo Hasnil, Nabiilah Helmy Purwanto Hidayati, Uslah I Nyoman Jujur Ilham Fajar Bagaskara Ilham Habibi, Ilham Imam Syafaat Irfan, Afi Muhammad Ismail, Nur Hidayah Ismoyo Haryanto Iwan Budiwan Anwar J. Jamari Jamari Jamari Januar Parlaungan Siregar Januar Parlaungan Siregar Joga D. Setiawan Joga Dharma Setiawan Joga Dharma Setiawan Joshua W. Syafei Joyanto Sitohang Kadavi, Fadhil Muhammad Kharisma A. Pambudi Kistriyani, Lilis Kolakoti, Aditya Kristianto, Henry Luky Hidayat M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Machrizal Noor Mahendra, Arya Makhfudz Ali Margana Margana Michael Ambarita Mochammad Ariyanto Mochammad Ariyanto Mochammad Ariyanto Moh Fawaid Moh. Erlangga Aditya Rifandi Mohammad Tauviqirrahman Muchammad Muchammad Muhammad Dzaky Arizsa Athallah Muhammad Dzulfikar Muhammad Fahrizal Almeir Muhammad Farel Muhammad Hafizh Mubarak Muhammad Ihya Mahendra Adi Muhammad Ikhsan Muhammad Khafidh Muhammad Rezha Assalam Muhammad Ritzky Novhar Muhammad Ulfan Arif Muji Setiyo Munadi Munadi Murti Ayu Nur Safitri Muryanto Nizar Rahman Aprilitama, Nizar Rahman Norman Iskandar Novianto, Arief Novriansyah, Robin Nurudin, Tri P., Alhakim B. P., Biyan B. Pambudi, Kharisma A. Pangesti, Adelia Pangestu, Wahyu Adi Pasmanasari, Elta Diah Paulus Wisnu Anggoro Poedji Haryanto Prasetyo, Adzan Jati Pratama, Wahyudi Prawibowo, Hartanto Priwintoko, Baharudin Purwati, Wiwik Putera, Finny Pratama Putra, Mileno Marandria Putri, Farika Tono Rahmawati, Maria Belladonna Rahmi Isma Asmara Putri Rama Sinatria Wisesa Reswara, Ghani Widyatna Ricky Prawira Rilo Berdin Taqriban Riski Maulana Rochman, Muhamad Latifur Rohmatullah, Muhammad Romadhon, Saeful Rofi Rusdjijati, Retno Rusiyanto Samsul Alamsyah Perwiranegara Saputra, Bagus Ari Sendie Yuliarto Margen Siregar, Januar Parlaungan Sitanggang, Frandy A Siti Aminah Sri Nugroho Sugiyanto - Sugiyanto Sugiyanto Sugiyanto Suhartini Suhartini Ismail Suhartini Ismail, Suhartini Sukarno Sukarno Sulardjaka Sulardjaka Sulistyo Sulistyo Supriyo Suryawan, Donny Susilo Adi Widyanto Syafa’at, Imam Syafei, Joshua W. Tavan Faiz Dhiahaqi Tezara Cionita Thesar Aditya Nurcholis Toni Prahasto Trianggoro Budisulistyo Turasno, Buang Wahid, Muhammad Abdul Wahyu Hidayat Wahyudi, Mujib Wijayanto, Juli Eri Wirawan Sumbodo Yasya Khalif Perdana Saleh Yogi Reza Ramadan, Yogi Reza Yopi Harwinanda A Yosafat Keljeski Sinaga Yosua Wijaya Yotenka, Rahmadi Yuris Setyoadi Yuris Setyoadi Yusuf Subagyo Zainal Arifin