| Title |
A Multiple Resources Leveling Method Considering Inefficient Fluctuations and Associated Costs |
| Authors |
Rhie, Jeseop ; Jang, Minseo ; Kim, Hojin ; Lee, Seungwoo ; Shin, Do Hyoung |
| DOI |
https://dx.doi.org/10.6106/KJCEM.2025.26.2.052 |
| Keywords |
Multiple Resources Leveling; Cost Optimization; Release and Re-hire (RRH); Resource Idle Days (RID) |
| Abstract |
In construction projects, inefficient resource fluctuations can lead to hiring, firing and rehiring of resources, or cause idle time, thereby incurring additional costs. Reducing such fluctuations is a critical task in resource leveling, and various studies have employed Release and Re-Hire (RRH) and Resource Idle Days (RID) as evaluation metrics. However, in multiple resources leveling, it is necessary to comprehensively consider both the inefficient fluctuations and costs of each resource, yet research in this area remains insufficient. This study proposes a cost-based multiple resources leveling model that applies weights according to the unit costs incurred by RRH or RID for each resource, aiming to reduce both RRH or RID and the associated costs simultaneously. To validate the model, the proposed model was applied to a cost-based multiple resources leveling system using a genetic algorithm, and multiple resources leveling was performed on a scheduling example with two types of resources, with different cost structures. By applying both RRH and RID, it was confirmed that the proposed model more effectively reduced loss costs compared to the existing model. This study presents a model that effectively reduces RRH or RID in projects with differing cost structures between resources, making a practical contribution to resource management in construction projects aimed at cost reduction. |