Strategic Decision Analysis for Investment Portfolios: Computational Risk Assessment in Transportation Asset Management Devy Sofyanty, Romadhoni Romadhoni, Handriadi Handriadi, Istamova Shokhida Makhsudovna, Zakiyah Anwar, Zokir Mamadiyarov Journal of Applied Science Engineering Technology and Education, 2025 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.
Analysis Strength Structure Fising Vessel of Composit Sandwich Plate System Using Finite Element Method Romadhoni, Budhi Santoso, Polaris Nasution Iop Conference Series Earth and Environmental Science, 2021 Fiberglass composite material is currently widely used as an alternative material or substitute material for metal and wood materials for the manufacture of fishing boats, because it has its own advantages, among others, easily formed in accordance with needs, has good strength and stiffness. However, in the operation of the ship the bow section often experiences a collision or collision so that when the ship is operating and leaning on the dock which causes a collision where the kinetic energy of the boat turns into a collision energy absorbed by the boat’s hull that is hit by a collision. The energy damaged the hull of the boat that was hit, so the front of the ship needs to be done by adding a new material that is a composite sandwich made with the aim of optimal weight efficiency, but has high rigidity and strength. There are many variations in the definition of sandwich composites, but the main factor of the material is the lightweight core, thus reducing the specific gravity of the material and the strength of the skin layer which gives strength to the sandwich composite. This research was carried out a static structural analysis of composite sandwich material using Ansys Workbench 14.5 software. A model is designed and analyzed using 3D CAD software, which is fore ships that have the potential to experience collisions. From the simulation results of the Fenite element method, the maximum principal stress of the model shows that the maximum point is 11.6 MPa. The maximum stress occurs at the ivory bottom, which is 6.9759 kN/m2 or 6.97 kPa, this occurs due to the bow of the fishing boat experienced a great imposition.
Main engine calculation for ferry Ro-Ro 500 DWT ship using electric propulsion A. Zulfaidah, Sarwoko, Suharto, Budhi Santoso, Romadhoni Iop Conference Series Materials Science and Engineering, 2020 Abstract The development of the current design of electrical system to protect the environment in the world. The purpose of this research is to obtain an electric propulsion system and engine power needed by the Ferry RoRo 500 DWT ship. The analysis begins by calculating the total ship resistance using the software. Next, the calculation of determining the generator power is calculated by a mathematical method. Resistance of 500 DWT RORO ferry at 12 knots 67.7 kN service speed. The increase in ship resistance is affected by the volume of the hull below the waterline. The greater the volume the greater the value resistance ship to get. The power play engine generator required to fight the value of ship resistance at the ferry RORO service speed of 984.49 kW.
Study on the Stability of High Speed Craft with Step Hull Angle Variations A Afriantoni, R Romadhoni, B Santoso Iop Conference Series Earth and Environmental Science, 2020 Abstract This research is to investigate the stability of High Speed Craft with step hull angle variations at Napoleon Patrol Boat. The Napoleon Patrol Boat is a speed control boat for marine and fisheries resources in Riau Province which has a limited operational area. In its operation, the Napoleon speedboat was used to patrol the waters of zone 1, namely the waters of Bengkalis, Siak and Meranti Regency. This ship was built using fiberglass construction that is lightweight and also strong. The number of cases of fishing theft and the problem of using fishing gear that is not in accordance with its designation, makes the presence of fast boats really necessary for the safety of the waters and the safety of the people there. In this study the Napoleon hull was modified by adding variations in the step hull angle. The stability analysis method used for this study is to use numerical computing software or shipping software to help calculate stability and equilibrium. Stability analysis is carried out by calculating the value of stability to the stability curve at the slope angle of -30° to 90°. The analysis uses the standard stability guidelines issued by IMO for HSC2000 fast boats with light arm 20°. The stability analysis results of maximum stability are found on the sail conditions of the PC Max GZ hull model 0.889 m at 51.8 deg, then the hull SH-2 Max GZ 1 m at 51.8 deg, and the hull model SH-2 Max GZ 0.758 m at 51, 8 deg. Analysis of the use of step hull variations on the hull of the SH-2 model has met all IMO criteria in 3 different conditions that have good stability.
Seakeeping Analysis of Hull Rounded Design with Multi-Chine Model on Fishing Vessel N Nurhasanah, B. Santoso, R. Romadhoni, P. Nasutioni Iop Conference Series Earth and Environmental Science, 2020 Abstract This research is to find out the hydrodynamic characteristics of a ship, it presented in the form of the characteristics of the movements that are usually experienced by the ship when sailing. Therefore, testing the motion performance of 3 GT fishing vessels is done by calculating the ship’s response to ocean waves, following the oceans and oceanic which cause oscillation movements in 3 degrees of freedom of ship compilation in the waters of the Malacca Strait. The object of the research model is 3 GT fishing vessel with a hull shape rounded by varying the amount of chine. The Rounded model and the Chine model are analyzed using motion to find out RAO ships such as heaving, rolling and pitching. RAO size for maximum heave motion occurs at a speed of 12 knots in the direction of 135° with a RAO value of 1.60 m/m with a frequency of 3.03 rad/s, the RC-2 Ship model with a frequency of 3,015 rad / s and a RH model ship and with a critical peak value of RAO heave 1,713 m with a frequency of 3.15 rad/s, the maximum roll value occurs wave angle 90° beam sea with RAO value ship model RC-3 is at the lowest point with a critical peak value of RAO roll 6.3048 deg/m with a frequency of 2.306 rad / s, the RC-2 Ship model with a frequency of 6,3048 rad / s and a RH model ship and with a critical peak value of RAO roll 6,405 m with a frequency of 3.092 rad/s. In RAO pict movements heading angle 180° head sea, RC-3 ship model is at the lowest point with a critical peak value of RAO roll 1.35 deg/m with a frequency of 2.93 rad / s, the RC-2 Ship model with a frequency of 1,45 rad/s with a frequency of 2.936 rad/s, and a RH model ship and with a critical peak value of RAO roll 1,843 m with a frequency of 3.015 rad/s. From the results of the study it can be concluded that the RC-3 type of fish has a good performance when used at sea.
An Analysis of Resistance and Stability of Double Step Hull with Fast Craft Romadhoni, Budhi Santoso, Afriantoni Proceedings of the 2019 2nd International Conference on Applied Engineering Icae 2019, 2019 This research is to analyze the resistance and stability of double step hull with fast craft. Fast boats have a design to reach the desired speed. In the manufacture of a ship, the manufacturers always pay attention to the economic and technological side, which is in addition to the planned design parameters, as well as economic considerations. Based on the above thoughts, the research tested the effectiveness of using the Step Hull on a 14 m patrol vessel, which has result in ship resistance, this proven when the speed is 28 knot the variation of model C has 16.5 kN resistance, model A has 18.6 kN, and model A has 18.2 kN. Then, the biggest power of each, model original are 468,725 HP for model B are 431,561, and for model C 424,916 HP. Result Analyze the stability and operability of the ship while operating stability ship was evaluated by HSC 2000 Annex 8 Monohull and International Maritime Organization (IMO) criteria. Based on that analysis, it was concluded that Model B has the best maximum GZ= 0.947m 53.6 deg than other models
RECENT SCHOLAR PUBLICATIONS
Structural reliability study of EJFBs fabricated from indigenous Indonesian Wood RC Ariesta, MA Hafiz, M Suranto, MS Purwoko Results in Engineering, 110944 , 2026 2026
Development of Smart Assessment System For Evaluating Maritime English Competence Using Machine Learning A Aprizawati, R Romadhoni, B Budhisantoso AL-ISHLAH: Jurnal Pendidikan 18 (1), 1076-1091 , 2026 2026
Intelligent Optimization of Fast Boat Hull Form for Resistance Reduction Using CFD and Surrogate-Assisted Algorithms B Santoso, MA Hafiz International Journal of Marine Engineering Innovation and Research 11 (1 … , 2026 2026 Citations: 1
Optimization of electric propulsion systems for ferry vessels: a case study in riverine operations B Santoso, J Custer, Z Ariany Journal of Naval Architecture and Marine Engineering 23 (1), 75-92 , 2026 2026
Assessment of Speed and Power Requirements for a Patrol Boat Repowered with Twin 300 hp Engines Using Computational Power Prediction B Santoso, R Romadhoni, M Riski, MS Purwoko, A Haris, B Satria International Conference on Applied Science and Technology on Engineering … , 2025 2025
Intact Stability and Seakeeping Assessment of a High-Speed Patrol Craft: GZ/GMt Metrics with RAO Responses under IMO A. 749 (18)/HSC Code B Santoso International Conference on Industrial Technology and Business (INTECHBIZ) 1 … , 2025 2025
Assessment Seakeeping Performance And Operability Model A Fast Craft Using Axe Bow R Romadhoni, B Santoso, IKAP Utama International Journal of Marine Engineering Innovation and Research 10 (4 … , 2025 2025
Analysis of the tensile strength of composite material: Plywood composite matrix based on epoxy resin for the construction of flat river shallow water vessels B Santoso, M Helmi, E Haryanto, Romadhoni AIP Conference Proceedings 3334 (1), 070002 , 2025 2025
Numeric resistance analysis of new hull design for amphibious high-speed craft Romadhoni, Fazrian, H Khotima, Suzdayan, Aprizawati AIP Conference Proceedings 3334 (1), 060003 , 2025 2025
SENSITIVITY ANALYSIS OF HYDROSTATIC PARAMETERS WITH RESPECT TO DISPLACEMENT CHANGES ON THE MINI BORNEO BARGE B Santoso, I Utama Journal of Marine-Earth Science and Technology 6 (1), 21-29 , 2025 2025
Strategic decision analysis for investment portfolios: Computational risk assessment in transportation asset management D Sofyanty, R Romadhoni, H Handriadi, IS Makhsudovna, Z Anwar, ... Journal of Applied Science, Engineering, Technology, and Education 7 (2 … , 2025 2025 Citations: 10
Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat B Santoso, P Nasution International Journal of Marine Engineering Innovation and Research 10 (2 … , 2025 2025
Assessment of Safe Loading Conditions for the SPCB Deck Crane Using Hydrostatic and GZ Curve Analysis B Santoso, P Nasution, Z Ariany International Journal of Marine Engineering Innovation and Research 10 (2 … , 2025 2025 Citations: 3
Implementasi Perhitungan Hydrostatika Untuk Safe Loading Condition Kapal Barge 240 Feet B Santoso, P Pardi, A Afriantoni, R Romadhoni, N Abdurrahman, ... INOVTEK Polbeng 15 (1), 1-16 , 2025 2025 Citations: 2
ANALISA PENGARUH VARIASI SUDUT BILGA KEEL TERHADAP GERAKAN KAPAL CEPAT TIPE CREW BOAT R Romadhoni, B Santoso, B Satria INOVTEK Polbeng 15 (1), 17-31 , 2025 2025 Citations: 2
Mesin Pencacah Rumput Untuk Meningkatkan Produktifitas Kelompok Tani Mitra Tani I Desa Bantan Tengah Bengkalis R Romadhoni, S Suzdayan, AT Pribadi, F Fazrian, B Satria, MYI Marzuki ARSY: Jurnal Aplikasi Riset kepada Masyarakat 6 (1), 118-126 , 2025 2025
Implementation of an Early Warning System Integrated with AIS-POLBENG Remote Base Station for the Safety of Traditional Ships in the Malacca Strait D Enda, S Supria, R Romadhoni, H Hardiyanto, MN Faizi, M Afridon ABEC Indonesia, 1-8 , 2025 2025
Polbeng Research Vessel Comfort Study in the Malacca Strait J Jamal, B Santoso, MA Hafiz, R Romadhoni, F Fazrian, J Jupri, J Juanda Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 22 (2) , 2025 2025
Structural reliability study of EJFBs fabricated from indigenous Indonesian Wood R Romadhoni, RC Ariesta, MA Hafiz, J Jamal, M Suranto, MS Purwoko, ... Available at SSRN 5778269 , 2025 2025
Analisa Hambatan Total Cathedral Hull Pada Kapal Amphibious High-Speed Craft F Fazrian, B Satria, A Aprizawati, H Khotima International Conference on Industrial Technology and Business (INTECHBIZ … , 2024 2024
MOST CITED SCHOLAR PUBLICATIONS
Study on the stability of high speed craft with step hull angle variations A Afriantoni, R Romadhoni, B Santoso IOP Conference Series: Earth and Environmental Science 430 (1), 012040 , 2020 2020 Citations: 17
Analisa pengaruh bentuk lambung axe bow pada kapal high speed craft terhadap hambatan total R Oni Kapal , 2015 2015 Citations: 13
Seakeeping analysis of hull rounded design with multi-chine model on fishing vessel N Nurhasanah, B Santoso, R Romadhoni, P Nasutioni IOP Conference Series: Earth and Environmental Science 430 (1), 012041 , 2020 2020 Citations: 11
Strategic decision analysis for investment portfolios: Computational risk assessment in transportation asset management D Sofyanty, R Romadhoni, H Handriadi, IS Makhsudovna, Z Anwar, ... Journal of Applied Science, Engineering, Technology, and Education 7 (2 … , 2025 2025 Citations: 10
The use of composit materials alternative fiberglass (coco fibers & rags) on fiberglass ship in traditional shipyards bengkalis regency R Oni Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 12 (3), 121-132 , 2015 2015 Citations: 6
Analisa olah gerak kapal di gelombang reguler pada kapal tipe axe bow R Romadhoni KAPAL: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 13 (2), 61-68 , 2016 2016 Citations: 5
Resistance and Intact Stability Calculation of Hull Form Tourism Boat Siak River for Passenger Safety B Santoso, M Ikhsan International Conference on Innovation in Science and Technology (ICIST 2020 … , 2021 2021 Citations: 4
Pelatihan pengelasan SMAW untuk masyarakat kurang mampu Desa Kuala Alam MS Purwoko, R Romadhoni, B Satria TANJAK 2 (1) , 2021 2021 Citations: 4
PENGARUH DISIPLIN DAN KEPEMIMPINAN DIRI DENGAN KINERJA PEGAWAI DIREKTORAT PERKAPALAN DAN KELAUTAN B Satria, A APRIZAWATI, R ROMADHONI JOURNAL OF ADMINISTRATION AND EDUCATIONAL MANAGEMENT Учредители: IPM2KPE 3 … , 2020 2020 Citations: 4
Assessment of Safe Loading Conditions for the SPCB Deck Crane Using Hydrostatic and GZ Curve Analysis B Santoso, P Nasution, Z Ariany International Journal of Marine Engineering Innovation and Research 10 (2 … , 2025 2025 Citations: 3
Assessment of the Stability and Response of a Catamaran-Hull Ferry to Operational and Environmental Conditions B Santoso, R Romadhoni, Z Ariany, M Ridwan Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 21 (3), 204-216 , 2024 2024 Citations: 3
Analisi Stabilitas Kapal Riset Polbeng Di Perairan Sea-State 3 MS Purwoko, J Jamal, B Santoso, S Siswandi, R Romadhoni INOVTEK Polbeng 14 (02), 152-161 , 2024 2024 Citations: 3
Analisa Desain dan Kalkulasi Biaya Pembangunan Kapal Perikanan 5 GT Berbahan Fiberglass untuk Perairan Riau R Romadhoni, B Santoso, S Purwoko, P Nasution Journal of Management and Bussines (JOMB) 5 (2), 964-976 , 2023 2023 Citations: 3
Aplikasi Dokumentasi Elektronik Memorandum Of Understanding (Mou) Dan Nota Kesepahaman Bersama Di Jurusan Kemaritiman Polbeng B Satria, PN Bengkalis Journal Of Information Technology And Computer Science , 2021 2021 Citations: 3
Pembuatan Alat Cuci Tangan Mobile Dalam Pencegahan Corona Virus Pada Tempat Ibadah R Romadhoni, B Santoso, M Helmi Integritas 4 (2), 264-274 , 2020 2020 Citations: 3
Analisa Expected Monetary Value Produksi Kapal Ikan Fiberglass Menggunakan Metode Decision Tree R Romadhoni, N Nurhasanah COSTING: Journal of Economic, Business and Accounting 4 (1), 63-69 , 2020 2020 Citations: 3
The Influence of Quality of Service, Transportation??" s Safety and Security, and Ticket??" s Price Purchase Decision PT Pelni Route Jakarta-Batam (Research in 2017) R Romadhoni, A Suparman, H Hasan Advances in Transportation and Logistics Research 1, 166-173 , 2018 2018 Citations: 3
Computational fluid dynamics analysis into the improvement of seakeeping characteristics of a fast craft using axe-bow R Romadhoni, I Utama, B Li IPTEK Journal of Proceedings Series 2 (1), 129-130 , 2016 2016 Citations: 3
Implementasi Perhitungan Hydrostatika Untuk Safe Loading Condition Kapal Barge 240 Feet B Santoso, P Pardi, A Afriantoni, R Romadhoni, N Abdurrahman, ... INOVTEK Polbeng 15 (1), 1-16 , 2025 2025 Citations: 2
ANALISA PENGARUH VARIASI SUDUT BILGA KEEL TERHADAP GERAKAN KAPAL CEPAT TIPE CREW BOAT R Romadhoni, B Santoso, B Satria INOVTEK Polbeng 15 (1), 17-31 , 2025 2025 Citations: 2
