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Optimization of the Standalone Hybrid Energy Storage System in The All-Electric Seabus Power System Based on Pulsed Propulsion Load Prediction
Full text linkIn marine applications, the energy storage system (ESS) functions as the primary energy supply for fully electric propulsion vessels. During variable operation conditions involving pulsed propulsion load, the ESS employing monotype topologies are often oversized and can damage the cells. This study proposes a hybrid energy storage system (HESS) for an all-electric Seabus with a 10-year operational lifespan, with the objective of optimizing the storage system size to ensure longer operation than 72 minutes at a speed of 30 knots under variable conditions. The impact of the HESS system on installation cost and weight was thoroughly investigated. Some HESS configurations are presented, utilizing Lithium Iron Phosphate (LFP) as the high-energy (HE) cell and supercapacitors, Lithium Ion Capacitor (LIC), and Lithium Titanium Oxide (LTO) as three alternatives of the high-power (HP) cell. The HESS design predates a parallel full-active configuration with a rule-based energy management method that utilizes cut-off power between HE and HP cells. In this specific case, the LFP-LTO configuration is the optimal HESS design rather than the LFP-SC and LFP-LIC configurations, meeting all established optimization criteria and weight limitations. The study demonstrates that the HESS configuration can achieve 120 minutes of operation, which is 67% longer than the operation time of previous Seabus operations
Analisis Proxemics dalam Transformasi Ruang Budaya Minangkabau terkait Pergeseran Fungsi pada Istano Basa Pagaruyuang
Full text linkIstano Basa Pagaruyuang, sebuah bangunan bersejarah di Sumatera Barat yang menandakan kekayaan budaya suku Minangkabau. Bangunan yang dibangun oleh Raja Adityawarman ini, bukan hanya merupakan peninggalan sejarah, tetapi juga monumen yang mempertahankan identitas kuat suku Minangkabau. Sebagai Rumah Gadang, Istano Basa Pagaruyuang ini meruapakan pusat kekuasaan kerajaan yang mencerminkan kearifan lokal dan kekayaan budaya pada zamannya. Pembangunan kembali Istano setelah kebakaran tahun 2007 menjadi bukti ketahanannya dan menceritakan kisah yang berharga.Terletak di Nagari Padang Siminyak, Kecamatan Tanjung Emas, Kabupaten Tanah Datar, Istano Basa Pagaruyuang memiliki struktur bangunan sejarah yang terintegrasi dengan makna penting bagi masyarakat Minangkabau. Penelitian ini fokus pada proxemics, khususnya ruang interior Rumah Gadang di dalam Istano Basa Pagaruyuang. Perubahan fungsi dari pusat kerajaan menjadi situs cagar budaya telah memengaruhi komunikasi nonverbal, mengeksplorasi aspek-aspek ruang, jarak, dan perilaku individu. Literatur penelitian membahas aspek-aspek fundamental proxemics, mengambil teori dari Edward T. Hall dan penelitian lain yang mengeksplorasi dampak desain fisik terhadap perilaku manusia. Metode penelitian yang digunakan adalah pendekatan kualitatif komprehensif dengan observasi partisipatif, wawancara mendalam, dan analisis dokumentasi. Hasil penelitian menunjukkan bahwa pergeseran fungsi Istano Basa Pagaruyuang telah memengaruhi transformasi ruang budaya Minangkabau, terutama terlihat dalam penggunaan ruang yang berubah dan pergeseran komunikasi nonverbal. Pembahasan mendetail melibatkan analisis ruang setiap area Rumah Gadang dan mengeksplorasi faktor-faktor proxemics yang mempengaruhi perubahan. Studi ini menyimpulkan bahwa pergeseran fungsi Istano Basa Pagaruyuang dari pusat kerajaan menjadi situs cagar budaya tidak hanya memengaruhi ruang fisik, tetapi juga hubungan sosial dan budaya yang kompleks yang tetap terjaga dalam monumen budaya ini
Terapi Seni Berpeluang Bisnis : Kreativitas Disabilitas Menjadi Produk Dekorasi Interior Bernilai Ekonomi dengan Konsep 3M
Full text linkAktivitas seni dan kreativitas memiliki peran penting bagi Anak Berkebutuhan Khusus (ABK) maupun Dewasa Berkebutuhan Khusus (DBK), yang dikenal sebagai terapi seni. Terapi seni tidak hanya berfungsi sebagai sarana untuk mengekspresikan diri dan mengembangkan kemampuan emosional, tetapi juga untuk meningkatkan kemampuan motorik, meningkatkan imajinasi dan memberikan peluang ekonomi melalui pemasaran karya sebagai produk dekorasi interior. Penelitian ini mengkombinasikan konsep terapi seni dengan desain interior untuk meningkatkan kreativitas ABK. Dengan memahami karakteristik unik ABK/DBK, kegiatan terapi seni dapat dirancang sedemikian rupa, hingga dapat dilaksanakan secara tepat bagi mereka. Tujuan penelitian ini adalah menggali dan memetakan potensi seni yang sederhana namun berdaya tarik sebagai dekorasi interior, sekaligus membuka peluang bisnis dari hasil karya tersebut. Kolaborasi antara ABK/DBK dan pendamping disabilitas menjadi elemen penting dalam penelitian ini, di mana pendamping—baik anggota keluarga maupun pihak lain yang peduli—berperan sebagai kurator untuk hasil karya. Selain itu, terapi seni juga membantu pendamping mengatasi rasa penat. Penelitian ini meggunakan metode eksperimental dan observatif partisipatif, dimana ABK/DBK sebagai subjek utama dalam upaya pengembangan kreativitas mereka. Hasilnya menunjukkan bahwa kerja sama ini meningkatkan kualitas karya dan kerekatan hubungan, serta menghasilkan produk dekorasi interior yang inovatif, berkelanjutan, dan inklusif
Pemodelan Simulasi Bobot Risiko Rantai Pasok Material Struktur dengan Metode Monte Carlo pada Konstruksi Sektor Gedung
Full text linkKeterlambatan material merupakan permasalahan yang vital dalam penyelesaian pekerjaan konstruksi, hal ini erat kaitannya dengan pemahaman aliran pasok material. Sehingga dibutuhkan simulasi untuk memprediksi waktu keterlambatan material dari sisi internal (supply, controll, process, demand) dan eksternal (disaster factor) serta menganalisis sensitivitas risiko rantai pasok. Penelitian ini dimulai dengan studi literatur untuk mendapatkan daftar risiko, lalu pengumpulan data dengan metode kuisioner kepada 50 responden yang ahli dalam pengadaan material konstruksi. Selanjutnya dilakukan analisis risiko menggunakan Monte Carlo dengan perangkat lunak crystal balls. Dari analisis tersebut didapatkan prediksi waktu keterlambatan material selama 2,25–5,70 hari untuk waktu minimum dan 15,19–32,98 hari untuk waktu maksimum. Tiga risiko keterlambatan paling dominan terdapat pada material beton pracetak (41,60%), baja (34,90%), dan besi (33,40%). Risiko tersebut adalah keterlambatan pembayaran kontraktor utama ke sub kontraktor, waktu tunggu yang lama karena pengiriman secara bertahap, dan kendala pada proses pabrik hingga keterbatasan material pada supplier
Deep Learning and Statistical Approaches for Forecasting the Indonesian Rupiah Exchange Rate
Full text linkAccurate forecasting of exchange rates is essential for economic stability, investment strategy, and policy formulation. This study presents a comparative analysis of two distinct modeling approaches for predicting the Indonesian Rupiah (IDR) exchange rate against the US Dollar (USD): the Markov Switching Generalized Autoregressive Conditional Heteroskedasticity (MS-GARCH) model and the Long Short-Term Memory (LSTM) network enhanced with an attention mechanism. The MS-GARCH model captures volatility clustering and regime shifts, while the LSTM-Attention model learns complex nonlinear temporal dependencies. Using historical USD/IDR exchange rate data, both models are evaluated based on Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), and Mean Absolute Percentage Error (MAPE). Empirical results show that the LSTM-Attention model achieves higher forecasting accuracy; however, the MS-GARCH model provides superior interpretability and insight into structural volatility. These findings underscore the importance of aligning model choice with forecasting objectives—highlighting that while deep learning offers enhanced predictive capability, statistical models remain valuable for risk analysis and financial diagnostics. The results support a complementary use of both methods in financial forecasting applications
Parametric Study of Embankment Stability And Geotextile Reinforcement On Soft Soil
Full text linkThe Semarang - Demak Toll Road Construction Project Section 1B has a length of 6.736 km, starting from STA. 1+578 to 8+314. There is a zone that has the highest embankment, namely zone N at STA. 4+200 to 4+600. However, based on soil investigation data, it is known that the Semarang - Demak Toll Road Construction Project Section 1B has a very thick compressible layer, which reaches a depth of 50 m. This makes the Semarang - Demak Toll Road Construction Project Section 1B face various challenges of construction on soft soil.The purpose of this research is to determine the Safety Factor (SF) value and the appropriate configuration of geotextile reinforcement requirements in an embankment with variations in compressible layer thickness, embankment height and embankment slope, especially in the case study of zone N with STA. 4+200 - 4+600. This research will be processed using the Limit Equilibrium Method (LEM) with the GEO5 auxiliary program.Based on the results in this study, it is known that the variation of compressible layer thickness does not have a significant influence on the calculation of the Safety Factor and geotextile reinforcement configuration. However, the variation of embankment height leads to the conclusion that the higher the embankment, the lower the Safety Factor. The variation of embankment slope also concluded that the steeper the embankment, the lower the Safety Factor. In addition, it is also known that the higher the embankment, the higher the number of geotextile reinforcement requirements and the steeper the embankment, the higher the number of geotextile reinforcement requirements. After making a nomogram of the relationship between these variations and implementing it on the case study, it is known that the embankment in Zone N of the Semarang - Demak Toll Road Construction Project Section 1B has a Safety Factor value of 0.42 and requires 33 layers of geotextile reinforcement with a tensile strength of 200 kN/m, a spacing of 25 cm between layers, and a Reduction Factor value of 1.65
Editorial
Full text linkHis JIFAM volume 7 (Special Issue 3) January 2025 publishes papers related to several methods to protect the infrastructure assets as well as soil improvement methods to support the sustainable development goals for asset infrastructures management.As regulated in Indonesian Scientific Journal Accreditation, a Scientific Journal can publish the Regular, Supplement and Special Edition. The JIFAM Editorial Team express their gratitude to the authors who already submitted their papers for the seventh volume (Special Issue 3)
Planning of Alternative Embankment Reinforcement on the Roadway. Case Study: Landslide on the Bypass Road of Lombok International Airport - Mandalika Section Km 10+415 to 10+519
Full text linkThe Lombok International Airport – Mandalika Bypass Road experienced a landslide at KM 10+415 to 10+519 in February 2023 during heavy rainfall. The landslide is estimated to have occurred due to the saturation of the embankment caused by groundwater flow and rainwater infiltration. The proposed reinforcement includes the use of foam mortar with thickness variations of 2m, 4m, and 6m, with or without subdrain. Another proposal involves using Rigid Inclusions in the form of controlled modulus columns (CMC) with column spacing variations of 2ø, 3ø, and 4ø, with or without subdrain. Numerical analysis of the safety factor (SF) and deformation (Uy) was conducted using the Plaxis 2D program, both for the initial condition and after reinforcement. In general, the SF and deformations (Uy) for all reinforcement variations meet the reinforcement criteria, i.e., SF > 1.5 and deformations (Uy) < 2cm. The smallest SF of 1.579 was obtained with 4m thick foam mortar with subdrain. The largest deformations (Uy) of 1.656 was found with 2ø column spacing CMC without subdrain. The most effective Stress Reduction Ratio of 0.13 was achieved with 2ø column spacing CMC without subdrain. The influence of the subdrain is not significant because the landslide surface did not reach the groundwater table
Analysis Of Slope Stability Based On The Effect Of Rainfall On The Lombok International Airport (Bil) - Mandalika Road Sta 10+375 To Sta 10+550
Full text linkBIL - Mandalika Bypass Road connects Lombok International Airport (BIL) to Mandalika Special Economic Zone (KEK). This road has a length of 17.3 KM and was completed in 2021. The construction of this section can cut the travel time from 45 minutes to 15 minutes from BIL to the Mandalika area. In early February 2023 when it was raining season, the BIL - Mandalika Bypass Road surface at sta 10+375 s/d 10+550 experienced cracks, and temporary maintenance had been carried out to keep road remain functional. At the end of May 2023, the cracks became worse and there was a decrease of road surface up to 1.2 to 1.8 meters. Based on the soil test report in the field when the landslide occurred, it shows that the groundwater level is 7.5 meters from the road surface. Laboratory test results show that the subgrade is more dominant sandy silt, besides that the 2024 planning report does not include rain parameters on design of slope stability. The purpose of this study is to determine the effect of rain and groundwater level on landslides and subsidence of the BIL - Mandalika STA 10+375 - 10+550 road in 2023. The simulation results of SEEP/W and SLOPE/W showed that the landslide or subsidence was caused by rain, where the slope safety factor before the landslide was 1.197 and decreased to 0.982 after rainfall happen from Januari 2023 to February 2023