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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan IPTEK Journal of Proceedings Series Teknika: Jurnal Sains dan Teknologi Jurnal IPTEK JURNAL MANAJEMEN TRANSPORTASI & LOGISTIK Al Ishlah Jurnal Pendidikan Journal of Economic, Bussines and Accounting (COSTING) Science and Physics Education Journal (SPEJ) INOVTEK POLBENG Prosiding Seminar Nasional Darmajaya INTECOMS: Journal of Information Technology and Computer Science Alignment: Journal of Administration and Educational Management Adimas : Jurnal Pengabdian Kepada Masyarakat DIKEMAS (Jurnal Pengabdian Kepada Masyarakat) INTEGRITAS : Jurnal Pengabdian Journal of Applied Science, Engineering, Technology, and Education International Journal of Marine Engineering Innovation and Research Journal of Management and Bussines (JOMB) Jurnal Manajemen Transportasi & Logistik (JMTRANSLOG) ARSY : Jurnal Aplikasi Riset kepada Masyarakat DEDIKASI PKM Journal of Marine-Earth Science and Technology Jurnal Ekonomi Proceeding Applied Business and Engineering Conference Apollo: Journal of Tourism and Business Journal of Embedded Systems, Security and Intelligent Systems Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Romadhoni
Departement Of Naval Architecture, Politeknik Negeri Bengkalis, Bengkalis, 28711
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Assessment of the Stability and Response of a Catamaran-Hull Ferry to Operational and Environmental Conditions Santoso, Budhi; Romadhoni, Romadhoni; Ariany, Zulfaidah; Ridwan, Muhammad
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.64789

Abstract

Ship stability is a critical factor in the operation of a catamaran, especially when facing various sea conditions. The catamaran H-192, recently acquired by PT XY, is used as a case study in this research to assess its stability and response to operational and environmental conditions. Stability criteria based on Annex 7 of the High-Speed Craft (HSC) Code are used as the evaluation standard. This research aims to evaluate the stability and response of the catamaran H-192 under various operational and environmental conditions. The primary focus is to ensure that the vessel meets and exceeds the stability criteria set by Annex 7 and to understand how the vessel behaves in real-world situations. The methods used in this research include stability calculations based on Annex 7 and model design using Maxsurf software. The calculations involve the analysis of the righting lever (GZ), metacentric height (GM), and other stability criteria. Operational data and load distribution are analyzed to determine the draft, trim, and stability of the vessel under various loading conditions. The results show that the catamaran H-192 not only meets but also exceeds the stability criteria set by Annex 7. The high values of righting lever (GZ) and metacentric height (GM) at various angles of heel indicate excellent transverse and longitudinal stability. The evaluation of intact stability criteria shows that all parameters achieve "PASS" status, indicating the vessel's capability to handle combinations of heeling forces due to wind, high-speed maneuvering, and passenger crowding very well. The analysis of both full and empty operational conditions shows balanced load distribution and maintained stability.
Mesin Pencacah Rumput Untuk Meningkatkan Produktifitas Kelompok Tani Mitra Tani I Desa Bantan Tengah Bengkalis Romadhoni Romadhoni; Suzdayan Suzdayan; Arief Teguh Pribadi; Fazrian Fazrian; Bobi Satria; Muahammad Yudi Ismail Marzuki
ARSY : Jurnal Aplikasi Riset kepada Masyarakat Vol. 6 No. 1 (2025): ARSY : Jurnal Aplikasi Riset kepada Masyarakat
Publisher : Lembaga Riset dan Inovasi Al-Matani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55583/arsy.v6i1.1119

Abstract

Pakan ternak berupa Rumput merupakan salah satu sumber makanan pokok bagi hewan ternak kerbau, sapi, maupun kambing dalam bertahan hidup, berproduksi serta berkembang biak. Untuk mendapatkan produksi ternak yang tinggi sangat tergantung pada pakan hijauan yang tersedia secara dan kontinyu. Sumber utama pakan hijauan adalah berasal dari rumput, maupun tanaman perkebunan hijau lainnya yang mempunyai kosenterat tinggi yang di butuhkan hewan ternak. Salah satu rumput yang sangat potensial dan sering diberikan pada ternak adalah rumput gajah (pennisetum purpureum). Tujuan dari pengabdian masyarakat ini adalah untuk dapat merancang bangun alat mesin pencacah rumput. Adapun demensi ukuran Panjang 70 cm, lebar 55,3 cm dan tinggi 90 cm. Adapan hasil pengujial mesin pencacah untuk mencacah rumput gajah 1 kg mebutuhkan waktu yaitu 50 detik, 51 detik dan 52 detik. Selanjutnya pada pengujian terakhir menggunakan rumput alang-alang dengan berat 1 kg membutuhkan waktu yaitu 58 detik, 57 detik dan 54 detik.
Polbeng Research Vessel Comfort Study in the Malacca Strait Jamal, Jamal; Santoso, Budhi; Hafiz, Muhammad Alimul; Romadhoni, Romadhoni; Fazrian, Fazrian; B, Siswandi; Jupri, Jupri; Juanda, Juanda
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 2 (2025): Article in Progress (Accepted Papers)
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i2.66948

Abstract

The Polbeng Research Vessel is a ship that will be built by Politeknik Negeri Bengkalis (Polbeng) in collaboration with CV. Fatih Bahari Engineering. This vessel is made of High Density Polythene (HDPE) plastic, with the main dimensions of the ship: length (LOA) is 9 metres, breadth (B) is 2.2 metres, height (H) is 1.2 metres, and it uses an 85 HP outboat engine. This vessel's comfort study was conducted to see the ship's performance against equipment and humans in supporting research activities carried out by Polbeng. There are 4 cases in the study where there are 2 wave heights, namely 0.2 metres and 0.4 metres; each wave height is taken from 2 directions of waves hitting the ship, namely the beam seas direction (900) and the head seas direction (1800). There are 3 motions analysed, namely heave, roll, and pitch movements. The results of the ship's motion show that the roll motion in the Beam Seas wave direction has a more significant motion when compared to other motions. The analysis results show that the motion is in accordance with the theory that small ships for roll motions have shorter turnaround arms. Overall, this ship's motion is still common and meets the ship's comfort criteria based on the criteria issued by NORDFORSK 1987, STANAG 4154, U.S. Coast Guard (USCG), ISO 2631/1, ISO 2631/3, and BS. 6841:1987
Strategic Decision Analysis for Investment Portfolios: Computational Risk Assessment in Transportation Asset Management Sofyanty, Devy; Romadhoni, Romadhoni; Handriadi, Handriadi; Makhsudovna, Istamova Shokhida; Anwar, Zakiyah; Mamadiyarov, Zokir
Journal of Applied Science, Engineering, Technology, and Education Vol. 7 No. 2 (2025)
Publisher : PT Mattawang Mediatama Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/454RI.asci3897

Abstract

This study presents a strategic decision-making framework for portfolio investment by applying computational risk assessment methods to the transportation sector in Indonesia. Focusing on two key players—PT. Adi Sarana Tbk (ASSA) and PT. Blue Bird Tbk (BIRD)—the research evaluates their individual and combined risk-return profiles using daily stock return data from December 2023 to November 2024. A hybrid analytical approach is employed, integrating traditional financial metrics with advanced computational techniques such as Monte Carlo simulation and Value at Risk (VaR) modeling to support managerial decision-making. The analysis reveals contrasting performance patterns: BIRD exhibits marginally positive expected returns (0.04%) but higher downside risk exposure, whereas ASSA shows negative average returns (-0.06%) yet demonstrates lower volatility and reduced extreme loss potential. Portfolio optimization results demonstrate that a diversified allocation of 60% ASSA and 40% BIRD generates improved risk-adjusted returns, achieving a positive expected return while maintaining lower overall risk compared to the individual assets. By incorporating monetary VaR estimates, this study enhances the practical relevance of risk analytics for portfolio managers, particularly in navigating volatile emerging markets. The findings underscore the importance of strategic asset allocation, business model differentiation, and quantitative risk modeling in constructing resilient investment portfolios. This research contributes both methodologically and managerially by offering a robust, replicable framework for strategic decision analysis in transportation asset management and beyond.
SENSITIVITY ANALYSIS OF HYDROSTATIC PARAMETERS WITH RESPECT TO DISPLACEMENT CHANGES ON THE MINI BORNEO BARGE Romadhoni, Romadhoni; Santoso, Budhi; Utama, IKAP
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

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

Abstract

This study presents a systematic sensitivity analysis of key hydrostatic parameters, keel to buoyancy distance (KB), metacentric radius (BM), and metacentric height (GM), with respect to incremental changes in displacement for the Mini Borneo barge. Utilizing only the vessel’s official stability booklet data, natural cubic splines were fitted to the discrete hydrostatic tables to reconstruct continuous functions for each parameter over the displacement range of 256.6 t to 1641.0 t. First derivative functions were then derived analytically and cross-validated via centered finite difference, enabling high-resolution evaluation of ∂KB/∂Δ, ∂BM/∂Δ, and ∂GM/∂Δ at 0.01 t increments. Results indicate that KB sensitivity peaks at a moderate load of approximately 436.6 t (0.00045 m/t), whereas BM and GM sensitivities reach their maxima at full-load conditions near 1641.0 t (0.00086 m/t and 0.00092 m/t, respectively). Critical displacement intervals were identified around these peaks, highlighting narrow bands where small weight additions most profoundly affect stability. These findings inform the definition of safe-loading envelopes and ballast-management strategies, providing practical thresholds to maintain regulatory stability margins without the need for additional sea trials. The methodology is readily generalizable to other small craft equipped with hydrostatic booklets..
Assessment of Safe Loading Conditions for the SPCB Deck Crane Using Hydrostatic and GZ Curve Analysis Santoso, Budhi; Romadhoni, Romadhoni -; Nasution, Polaris; Hardiyanto, Hardiyanto; Ariany, Zulfaidah
International Journal of Marine Engineering Innovation and Research Vol 10, No 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.22862

Abstract

This study comprehensively assesses safe loading conditions for the Self-Propelled Crane Barge (SPCB) Deck Crane by integrating detailed hydrostatic calculations with righting-arm (GZ) curve analysis. At the designated summer draft of 2.75 m, baseline parameters—displacement (1 716 t), centre of buoyancy (KB = 0.765 m), transverse metacentre (KM = 2.780 m), and metacentric height (GM = 1.23 m)—were established from the vessel’s stability booklet. Four loading scenarios (lightship, full ballast, crane at maximum outreach, and cargo distribution) were defined, with updated displacement and vertical centre of gravity (KG) values used to recompute hydrostatic parameters (BM, KM, free-surface corrections) and generate full GZ curves. Intact-stability criteria (GM ≥ 0.15 m, area under GZ curve ≥ 0.08 m·rad, angle of vanishing stability ≥ 25°, and GZmax ≥ 0.25 m) were evaluated for each case. Results indicate that the ballast condition yields the highest stiffness (GM ≈ 1.50 m) and energy absorption (AUC ≈ 1.15 m·rad). The crane-outreach scenario represents the narrowest margin (GM ≈ 0.90 m, AUC ≈ 0.60 m·rad). A safe-loading envelope was developed, showing permissible crane loads of up to 100 t at 10 m outreach and limiting lifts beyond 20 m to 50 t or less. Mitigation measures—ballast management, outreach/load restrictions, optimized cargo stowage, and real-time monitoring—are recommended to ensure regulatory compliance and operational safety.
Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat Romadhoni, Romadhoni; Santoso, Budhi; Nasution, Polaris
International Journal of Marine Engineering Innovation and Research Vol 10, No 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.22909

Abstract

Abstract¾ Low-freeboard harbour tugboats often work in quartering seas where a single boarding wave can leave water sloshing on deck and erode their transverse stability. This paper evaluates how much of that erosion a 28 m tug can tolerate before it breaks the intact-stability limits of IMO MSC 267(85). Using only the vessel’s trim-and-stability booklet, the study superimposes thin sheets of retained water—0 to 0.35 m deep, with drainage coefficients κ = 0.50–0.90—on three loading states: fully laden, half-load and lightship. For every depth and κ pair the corrected righting-arm curve, metacentric height and righting-area reserves are recomputed; a limiting-KG curve and a κ–depth PASS/FAIL heat-map are then produced, and wave data from BMKG (2020–2024) are used to estimate the yearly probability of exceeding the IMO limits. Calculations show that in the full-departure condition the first IMO criterion fails when only 0.12 m of water is trapped at κ = 0.70, whereas the threshold rises to 0.24 m at half-load and 0.31 m in lightship. Lowering κ to 0.55—achievable by higher bulwarks or larger freeing ports—moves the failure boundary rightward by nearly 50 % and cuts the annual exceedance probability below 10⁻³.
Application Of The Goal Programming Method In Increasing Plate Production For Steel Ships Nurhasanah, Nurhasanah; Septi Ayu Angraini; Romadhoni, Romadhoni
Jurnal Ekonomi Vol. 13 No. 02 (2024): Jurnal Ekonomi, Edition April - June 2024
Publisher : SEAN Institute

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

Abstract

PT. Gunawan Dianjaya Steel (GDS) is one company that produces steel plates in Indonesia. PT GDS was hot sheet steel factory (BLP ) producing steel and steel in all sorts of different types and design of consumer conformed to order.A kind of steel produced by the blp hot sheet steel it is divided into the type form the coil and plate masing-masing form the quality of being domestic composed of different kinds, imports and CRM. Production planning basically there are three elements need to be considered, the consumers, products, and the manufacturing process.All three of these elements is a very complex to be faced by the company.This study attempts to determine the optimal combination that can reach the whole purpose of these elements of the company. Methods used in this research is goal programming, a method of optimize developed to solve the problems with the aim of more than one.The goal programming has the ability to achieve a number of goals or target. From the mathematical linear fomulasi until they reached the goal total production x1 + x2 + x3 = 10 + 75 + 65 = 140 plate targetless 150 plate.Goal of a production = 10 plate that means 40 plate under production target of 50 plate goal products b = 75 plate that means in accordance with company production target.Goal production products c = 65 plate that means less than 15 a plat of 80 plate company production target.The product is the total second Rp.100.000 x1 + Rp. 175.000 x2 + Rp. 200.000 x3 = Rp.100.000 (10) + Rp.175.000 (75) + Rp.200.000 (65) = Rp. 1.000.000,- + Rp.13.125.000,- + Rp.13.000.000,- = Rp. 27.125.000,-
Assessment of Safe Loading Conditions for the SPCB Deck Crane Using Hydrostatic and GZ Curve Analysis Budhi Santoso; Romadhoni; Polaris Nasution; Hardiyanto; Zulfaidah Ariany
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6422

Abstract

This study comprehensively assesses safe loading conditions for the Self-Propelled Crane Barge (SPCB) Deck Crane by integrating detailed hydrostatic calculations with righting-arm (GZ) curve analysis. At the designated summer draft of 2.75 m, baseline parameters—displacement (1 716 t), centre of buoyancy (KB = 0.765 m), transverse metacentre (KM = 2.780 m), and metacentric height (GM = 1.23 m)—were established from the vessel’s stability booklet. Four loading scenarios (lightship, full ballast, crane at maximum outreach, and cargo distribution) were defined, with updated displacement and vertical centre of gravity (KG) values used to recompute hydrostatic parameters (BM, KM, free-surface corrections) and generate full GZ curves. Intact-stability criteria (GM >= 0.15 m, area under GZ curve >= 0.08 m·rad, angle of vanishing stability >= 25°, and GZmax >= 0.25 m) were evaluated for each case. Results indicate that the ballast condition yields the highest stiffness (GM approximately equal to 1.50 m) and energy absorption (AUC approximately equal to 1.15 mrad). The crane-outreach scenario represents the narrowest margin (GM approximately equal to 0.90 m, AUC approximately equal to 0.60 mrad). A safe-loading envelope was developed, showing permissible crane loads of up to 100 t at 10 m outreach and limiting lifts beyond 20 m to 50 t or less. Mitigation measures—ballast management, outreach/load restrictions, optimized cargo stowage, and real-time monitoring—are recommended to ensure regulatory compliance and operational safety.
Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat Romadhoni; Budhi Santoso; Polaris Nasution
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6438

Abstract

Low-freeboard harbour tugboats often work in quartering seas where a single boarding wave can leave water sloshing on deck and erode their transverse stability. This paper evaluates how much of that erosion a 28 m tug can tolerate before it breaks the intact-stability limits of IMO MSC 267(85). Using only the vessel’s trim-and-stability booklet, the study superimposes thin sheets of retained water—0 to 0.35 m deep, with drainage coefficients K = 0.50–0.90—on three loading states: fully laden, half-load and lightship. For every depth and K pair the corrected righting-arm curve, metacentric height and righting-area reserves are recomputed; a limiting-KG curve and a K–depth PASS/FAIL heat-map are then produced, and wave data from BMKG (2020–2024) are used to estimate the yearly probability of exceeding the IMO limits. Calculations show that in the full-departure condition the first IMO criterion fails when only 0.12 m of water is trapped at K = 0.70, whereas the threshold rises to 0.24 m at half-load and 0.31 m in lightship. Lowering K to 0.55—achievable by higher bulwarks or larger freeing ports—moves the failure boundary rightward by nearly 50 % and cuts the annual exceedance probability below 10-3.
Co-Authors -, Nuhasanah Abdul Razak Shaari Adelia Fitriyani Afriantoni Afriantoni Afriantoni, A Afridon, M Akmal Lazuardy Anwar, Zakiyah Aprizawati Aprizawati Aprizawati Aprizawati aprizawati aprizawati Aprizawati, Aprizawati Ariany, Zulfaidah Arief Teguh Pribadi Arwanda Arwanda Bobi Satria Budhi Santoso Budhi Santoso Budhi Santoso Budhi Santoso Budhi Santoso Budhisantoso Budhisantoso Custer, Johny Deny Nusyirwan Depandi Enda Devy Sofyanty Faizi, M Nur Faizi, M. Nur Fazrian Fazrian Fazrian, Fazrian Hafiz, Muhammad Alimul Handriadi, Handriadi Hardiyanto Hardiyanto Hardiyanto Hardiyanto, Hardiyanto I.K.A.P Utama IK.A Pria Utama IKAP Utama Jamal Jamal Jamal Jamal Juanda Juanda Jupri Jupri Lazuardy, Akmal Li, Binbin M Ikhsan M Ikhsan Makhsudovna, Istamova Shokhida Mamadiyarov, Zokir Mohamed Nasir Alivi Muahammad Yudi Ismail Marzuki Muhammad Alimul Hafiz Muhammad Helmi Muhammad Ikhsan Muhammad Ridwan Nasution, Polaris Naufal Abdurrahman Nur Rahmani Nurhasanah Nurhasanah Nurhasanah Nurhasanah Pardi Pardi Pardi Pardi, Pardi Polaris Nasution Rahmani, Nur Razali Razali Rizali Robyansyah Robyansyah Santoso, Budhi Septi Ayu Angraini Septi Ayu Angrayni Sidik Purwoko Siswandi B Supria Supria, Supria Supriyadi Supriyadi Suzdayan Suzdayan Suzdayan Suzdayan, Suzdayan Utama, IKAP Zulfaidah Ariany Zulfaidah Ariany Zulyani Zulyani Zusniati Zusniati