Developing a Formative Construction Supply Chain Resilience Index to Improve Cost and Schedule Stability in Post-Disaster Projects

2026-04-27T22:29:27+07:00

Background: Construction material supply chain resilience has emerged as a critical determinant of infrastructure project success in disaster-prone regions; however, its quantitative measurement at the post-disaster project level remains limited, particularly at the district scale. Despite East Lombok being an earthquake-affected area with intensive reconstruction activities, no empirical model has systematically quantified supply chain resilience and tested its influence on project cost and schedule performance.
Aims: This study aimed to identify priority factors of construction material supply chain resilience and to examine the effect of a resilience index on post-earthquake project performance.
Methods: An explanatory quantitative approach was applied to 25 reconstruction projects in East Lombok, involving eight experts for AHP weighting and multiple regression analysis of CPI and SPI using SPSS/Stata.
Result: The results indicated that supplier diversification was the dominant factor (weight = 0.32) with acceptable consistency (CR = 0.069), while the average resilience index reached 0.64. The resilience index explained 46% of cost performance variance and 52% of schedule performance variance, demonstrating significant positive relationships (p < 0.05).
Conclusion: These findings confirm that supply chain resilience functions as a risk-buffering mechanism for cost and schedule stability in post-disaster projects. The study provides an empirical operationalization of Supply Chain Resilience into a measurable AHP-based index.

Hole Saw-based Pipe Notcher Design: A Cost-effective Manufacturing Solution for 1–3 inch Diameter Pipe

2026-01-13T15:17:52+07:00

Background: The development of the manufacturing industry demands increased efficiency and precision in pipe joining, a crucial process in machine construction. However, a major obstacle in the field is the manual pipe notching process, which is time-consuming and highly dependent on the operator's skill level, often resulting in imprecise cuts. This inconsistent notching directly complicates the pipe joining process by welding.
Aims: This research aims to design and produce a portable pipe notcher tool based on a hand drill machine for pipes with a diameter of 1–3 inches to improve the quality of perpendicular pipe joints during welding.
Methods: The research method uses a systematic approach which includes needs identification, 3D design planning, manufacturing, and experimental testing.
Result: The design resulted in a tool with dimensions of 980x540x385 mm with smoother and more precise cutting results compared to manual methods. Tests showed significant cutting time efficiencies: Ø1 inch pipe was reduced from 205 to 53 seconds, Ø2 inch from 286 to 75 seconds, and Ø3 inch from 484 to 99 seconds.
Conclusion: This pipe notcher tool design has been proven to increase productivity and produce precise cuts, providing an affordable, appropriate technology contribution to the small-scale manufacturing industry.

Open Science and Technology

Developing a Formative Construction Supply Chain Resilience Index to Improve Cost and Schedule Stability in Post-Disaster Projects

Hole Saw-based Pipe Notcher Design: A Cost-effective Manufacturing Solution for 1–3 inch Diameter Pipe