GIS-Based Flood Hazard Mapping and Spatial Analysis in North Luwu Regency, Indonesia Erpika Ansela Surira, Idawarni Asmal, Miswar Tumpu, Hoong Pin Lee Civil Engineering and Architecture, 2026 Floods are among the most frequent and destructive natural disasters in Indonesia, severely affecting human settlements, infrastructure, and regional development. North Luwu Regency, particularly Masamba, experienced a catastrophic flash flood in 2020 that caused loss of life, significant infrastructure damage, and long-term disruption to community livelihoods, emphasizing the urgent need for resilient and sustainable flood mitigation strategies aligned with the Sustainable Development Goals (SDGs), especially SDG 11 and SDG 13. Previous mitigation efforts relying primarily on structural infrastructure have proven insufficient due to sedimentation, inadequate maintenance, and rapid land-use change. Therefore, a holistic and evidence-based approach is required to address hydrological, ecological, and socio-spatial interactions in flood-prone regions. This study applies GIS-based spatial analysis using four primary datasets: Digital Elevation Model (DEM), flow direction, flow accumulation, and flood hazard maps. The integration of these datasets provides a systematic framework for developing spatially informed flood mitigation strategies in North Luwu Regency. Spatial overlay and hydrological modelling identified high-risk downstream zones, critical upstream catchments, and demonstrated strong relationships between topography, flow concentration, and hazard distribution. Findings reveal that low-lying downstream areas near the coast and river confluences are most susceptible to flooding, overlapping significantly with densely populated settlements and agricultural zones. The study recommends a dual mitigation strategy integrating structural measures (retention basins, drainage enhancement, and sediment control) with non-structural actions (ecosystem restoration, community-based early warning systems, and land-use regulation) within an Integrated Flood Management (IFM) framework. This integrated approach is essential for enhancing regional resilience, supporting sustainable spatial planning, and strengthening disaster risk reduction policies in accordance with the SDGs.
Application of lightweight BIM technology in construction management of prefabricated buildings Shanglin Yang, Hoong-Pin Lee, Nurulhuda Ahamad, Zheng Yu Proceedings of SPIE the International Society for Optical Engineering, 2026 As China accelerates its digital transformation in the construction sector during the 14th Five-Year Plan period, technologies such as Building Information Modeling (BIM), the Internet of Things (IoT), and Artificial Intelligence (AI) are becoming critical enablers in construction management. While prefabricated construction offers clear benefits in efficiency and environmental performance, it still faces challenges such as poor on-site coordination and ineffective technical briefings. This study introduces a lightweight BIM-driven visual management methodology tailored for prefabricated construction projects, aimed at enhancing coordination efficiency and technical communication on-site. By integrating BIMMAKE for modeling and site planning with BIMFILM for animated construction briefings, a unified “Modeling-Planning-Briefing-Feedback” workflow is established. A case study of a prefabricated residential project demonstrates that the proposed method significantly reduces construction time, improves safety, and minimizes rework and miscommunication. A quantitative assessment validates the proposed framework’s effectiveness in optimizing construction timelines, enhancing spatial coordination, and improving information flow among stakeholders, especially in small- to medium-scale projects. The study also discusses technical and managerial obstacles encountered during implementation and proposes corresponding optimization strategies.
Optimization and Structural Assessment of Buton Modified Asphalt Concrete Using RSM and KENPAVE: Mechanical Response under Compressive Loading Irianto Irianto, Miswar Tumpu, Hoong-Pin Lee Civil Engineering and Architecture, 2026 The increasing demand for durable, sustainable, and resilient pavement systems—aligned with global objectives, such as the Sustainable Development Goals (SDGs), particularly SDG 9 and SDG 11—has encouraged the use of Modified Buton Asphalt (MBA) in asphalt concrete wearing course (AC-WC) mixtures. This study aims to enhance the mechanical and structural performance of MBA-modified AC-WC by integrating Response Surface Methodology (RSM) for mixture optimization and KENPAVE for evaluating compressive behavior under mechanistic loading. RSM identified the optimal combination of aggregate gradation, asphalt content, and filler proportion, resulting in a mixture with a compressive strength of 1.26 MPa. Laboratory testing further demonstrated a Poisson's ratio of 0.31, an elastic modulus of approximately 850 MPa, and a toughness index of 3.2, indicating a balanced stiffness–ductility performance beneficial for long-lasting pavements. KENPAVE analysis under standard axle loading revealed a maximum vertical tensile strain of 2.3×10<sup>-4</sup> at the bottom of the asphalt layer and a surface deflection of 0.81 mm, both falling within accepted design limits and reflecting adequate resistance to structural distress and rutting. The combined application of RSM and KENPAVE effectively links mix design optimization with structural response assessment, supporting sustainable pavement design practices. These findings confirm that the optimized MBA-modified mixture offers reliable mechanical behavior and load-bearing capacity, contributing to more sustainable and resilient road infrastructure. Future studies are recommended to examine long-term performance, including fatigue life and environmental aging, to support wider implementation in sustainable pavement engineering.
Enhancement of structural and photoluminescence characterizations in Sm3+ and Cu2+-doped zinc bismuth borate glasses Khaled Hamdy, Ahmed Nabhan, Mohamed Taha, Mohamed I. Shehata, Hoong-Pin Lee, Maher Rashad, Asmaa M. A. Mahmoud Journal of Materials Science Materials in Electronics, 2026 Bismuth-based glasses have emerged as eco-friendly, lead-free alternatives for advanced optical and shielding applications. In this study, zinc–bismuth borate glasses with the nominal composition (30 − x )Bi 2 O 3 –30B 2 O 3 –40ZnO– x MO (where MO signifies Sm 2 O 3 or CuO, x = 0, 5 mol%) were synthesized via the melt-quenching technique. The investigation focused on the quantitative impact of Sm 2 O 3 and CuO doping on the physical, structural and spectroscopic properties of the matrix. The impacts on density, molar volume, structural, mechanical, and photoluminescence properties were extensively investigated. Examination methodologies included X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and ultrasonic velocity measurements. XRD analysis confirmed the amorphous nature of the synthesized glasses. FTIR spectra indicated an increase in the cross-link density of the Bi 2 O 3 –B 2 O 3 –ZnO network, evidenced by the emergence of [BO 4 ] units and an increased presence of [BiO 6 ] and [BiO 3 ] groups, which collectively enhanced the covalent character of the chemical bonds. Ultrasonic measurements revealed that both longitudinal and shear velocities increased with Sm 2 O 3 doping but decreased with the addition of CuO. This trend is attributed to the enhanced structural connectivity and rigidity induced by Sm 3+ ions. Consequently, mechanical properties (including elastic moduli, microhardness ( H u ), Poisson’s ratio, and Debye temperature) showed a significant improvement with Sm 2 O 3 substitution. A direct correlation was observed between microhardness and the softening temperature T s , the increase in T s with Sm 2 O 3 and CuO content indicates improved cross-linking and a reduction in non-bridging oxygen (NBO) atoms, aligning with density and FTIR data. Photoluminescence (PL) spectra obtained in the UV–Visible–NIR range exhibited four characteristic emission bands for Sm 2 O 3 -doped glass at 565, 602, 648, and 702 nm, corresponding to the 4 G 5/2 to 6 H 5/2, 7/2, 9/2, 11/2 transitions. Additionally, universal emission peaks were observed at 380 and 405 nm (Bi 3+ ions), 462 nm (band-edge excitation), 469 nm (Zn interstitials/vacancies), and 543 nm (oxygen vacancy defects). The enhancement in ultrasonic velocities was linked to the structural transition of boron from threefold (BO 3 ) to fourfold (BO 4 ) coordination, increasing network stiffness. Finally, PL intensity was significantly enhanced by Sm 3+ doping but showed a decrement with Cu 2+ incorporation. The outcomes demonstrate that Sm 2 O 3 doping greatly improves mechanical and optical properties, making these glasses acceptable for photonic purposes.
Comparative SEM–EDS Characterization of Marine Sand from Multiple Coastal Regions of Central Indonesia for Engineering Applications Adnan, Miswar Tumpu, Muhammad Jabir Muhammadiyah, Andung Yunianta, Hoong-Pin Lee Engineering Technology and Applied Science Research, 2026 Marine sand is an alternative construction material due to the growing demand for natural aggregates and the depletion of terrestrial resources. Its use also aligns with the Sustainable Development Goals (SDGs), particularly SDG 9, SDG 11, and SDG 12. This study examines the mineralogical and elemental characteristics of marine sand collected from several coastal regions in central Indonesia, including South Sulawesi (Balusu Barru, Bojo Barru, Pangkep, Pare-Pare, Pinrang, and Selayar) and East Kalimantan (Muara Badak), using Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM–EDS). The results indicate regional variations in particle morphology, surface texture, and elemental composition, reflecting differences in geological setting and coastal sediment processes. Several samples exhibit silica-dominated characteristics, while others show higher contents of calcium (Ca)-, magnesium (Mg)-, and iron (Fe)-bearing phases, suggesting varying levels of suitability for engineering applications. SEM–EDS analysis reveals silicon (Si) contents ranging from approximately 2.9 to 12.8 wt.% and Ca contents between 0.0 and 18.5 wt.%. The novelty of this study lies in its comparative regional assessment, demonstrating that marine sand should not be treated as a homogeneous material across different coastal environments. From an engineering perspective, the findings provide valuable insights for material selection in concrete, mortar, and geotechnical applications, particularly for coastal infrastructure development, while emphasizing the importance of site-specific characterization to support sustainable material utilization and environmentally responsible construction practices.
Characterization of unidirectional hybrid kenaf/glass bio-composites: Experimental and analytical study Reza Mahjoub, Jamaludin Mohamad Yatim, Abdul Rahman Mohd. Sam, Xiangming Zhou, Mehdi Raftari, Hoong-Pin Lee Journal of Composite Materials, 2026 Natural fiber composites are gaining recognition as sustainable alternatives for lightweight structural applications, yet achieving a balance of strength, toughness, and durability remains a persistent challenge. This study investigates continuous hybrid unidirectional kenaf/glass fiber-reinforced epoxy composites (HKGFRP) at three fiber volume contents (10%, 30%, 40%) and varying glass portions. The experimental evaluation included tensile testing, analysis of variance (ANOVA), and scanning electron microscopy (SEM), while analytical predictions were obtained using the adopted rule of mixtures (AROM). Results show that at 30% fiber volume, the hybrid with 10% glass fiber achieved 18% higher ultimate tensile strength and 30% greater strain energy density compared to kenaf fiber composites, while also exhibiting improved ductility. SEM analysis revealed reduced interfacial debonding at the optimum, whereas higher glass fiber portions led to premature failure due to strain-to-failure mismatch. AROM predictions closely matched experimental data, validating the model’s applicability. Based on the observed limitations of layered hybrid composites, particularly debonding failures at the interfaces, filament-level hybridization is proposed as a promising future fabrication strategy to enhance mechanical performance and long-term sustainability of bio-composites for structural engineering.
Strengthening and Cost Efficiency of GFRP-Reinforced Bridge Deck Slabs: A Case Study Mardiana Amir, Andi Muhammad Subhan, Nur Irmadayanti Idris, Mega Shine Payungallo, Bagus Guritno, Miswar Tumpu, Hoong-Pin Lee Engineering Technology and Applied Science Research, 2026 Bridges are essential for national and regional connectivity, yet their deck slabs often deteriorate over time due to excessive loads, material fatigue, and environmental exposure, potentially reducing their structural safety. This study evaluates (1) the structural performance improvement of the Pute Bridge-river deck slab after strengthening with Glass Fiber Reinforced Polymer (GFRP) and (2) the cost efficiency of GFRP compared to conventional slab replacement. The methodology involved structural modeling using the SAP2000 v22, static load testing using a Deflection Multimeter (DMM), and cost analysis based on Analisa Harga Satuan Pekerjaan (AHSP) translated as Unit Price Analysis. The results indicate a 20.80% increase in load capacity (from 274 to 331 tons) and over 90% reduction in deflection at critical points, with mid-span deflection decreasing from -66.70 mm to -3.50 mm. Economically, GFRP strengthening costs 518,792,152.60 Rp, making it 28.62% more economical than slab replacement. Overall, GFRP proves both technically effective and cost-efficient, making it a significant solution for bridge deck slab rehabilitation due to its time efficiency, minimal traffic disruption, and long-term durability.
Fast Charging of Electrical Vehicles M. R. Rashmi, Lee Hoong Pin, Vigna K. Ramachandaramurthy, Anushka Tripathi, S. P. Soundharya, A. Suresh International Review of Automatic Control, 2025
Solar Powered Wireless Electric Vehicle Charger M. R. Rashmi, J. M. Kenny Gee Oberoi, Ram Chaitanya Tangudu, Lee Hoong Pin, S. Kamalakkannan, N. Darshan International Review of Automatic Control, 2025
POZZOLANIC ADMIXTURES EFFECTS ON GREENERY THRIVING IN PERVIOUS CONCRETE: A GROWTH PERFORMANCE INVESTIGATION Journal of Engineering Science and Technology, 2024
SteFib ECC Built a Resilience Infrastructure Nurharniza Abdul Rahman, Siti Hawa Hamzah, Amirullah Maat, Chow Yee Foo, Intan Syaqirah Mohd Zulkifli, Bashirulhafi Abdul Rahman, Tezara Cionita, Norjihan Malek, Kishan Gunesegeran, Lee Hoong Pin, Low Wen Pei E3s Web of Conferences, 2024
A UNIAXIAL UNLOADING AND RELOADING BEHAVIOUR OF SSTT-CONFINED CONCRETE WITH DIFFERENT LATERAL CONFINING STRESSES Journal of Engineering Science and Technology, 2024
NUMERICAL SIMULATION ON THE BEHAVIOR OF CELLULAR STAINLESS-STEEL BEAM (CSSB) AT ELEVATED TEMPERATURE Journal of Engineering Science and Technology, 2024
Power Factor Correction Using SEPIC Converter Kenny Gee Oberoi J.M, Myreddy Kumar Durga Trinadh, Tangudu Ram Chaitanya, Lekshmi S., Rashmi M.R., Lee Hoong Pin 10th International Conference on Electrical Energy Systems Icees 2024, 2024
REMOVAL OF ORGANIC MATTERS, NUTRIENTS, AND SUSPENDED SOLIDS USING COCKLE SHELL (Cerastoderma Edule) FROM CONTAMINATED WATER Journal of Engineering Science and Technology, 2024
CONCRETE PAVING BLOCKS INCORPORATING PALM OIL BOILER ASH AND PALM OIL CLINKER AS SUBSTITUTE CONCRETE MATERIALS Journal of Engineering Science and Technology, 2023
MODEL PREDICTION FOR COMPRESSIVE STRENGTH OF A FULLY CONFINED CONCRETE CYLINDER WITH CARBON FIBRE REINFORCED POLYMER Journal of Engineering Science and Technology, 2023
CASCADED H-BRIDGE MULTILEVEL INVERTER BASED D-STATCOM USING GOERTZEL ALGORITHM Journal of Engineering Science and Technology, 2023
EFFECTIVENESS OF BOTTOM ASH AS FINE AGGREGATE REPLACEMENT IN ENGINEERED CEMENTITIOUS COMPOSITES Journal of Engineering Science and Technology, 2023
ADSORPTION OF ZINC, COPPER, AND IRON FROM SYNTHETIC WASTEWATER USING WATERMELON (Citrullus Lanatus), MANGO (Mangifera Indica L.), AND RAMBUTAN PEELS (Nephelium Lappaceum L.) AS BIO-SORBENTS Journal of Engineering Science and Technology, 2023
Performance of high strength concrete specimens with square section using steel strapping tensioning technique Pertanika Journal of Science and Technology, 2017