| Title |
Transport Efficiency Analysis of the Lines of Urban Railway using Data Envelopment Analysis |
| Authors |
김수현(Kim, Soo Hyun) ; 정헌영(Jung, Hun Young) ; 이원규(Lee, Won Gyu) |
| DOI |
https://doi.org/10.12652/Ksce.2014.34.2.0605 |
| Keywords |
도시철도;효율성;규모의 경제성;자료포락분석;운임제도;무임 손실비용;다차원척도법 Urban railway;Efficiency;Economies of scale;Data envelopment analysis (DEA);Fare system;Cost of free riding;Multidimensional scaling (MDS) |
| Abstract |
Recent climage changes have resulted in increases in rainfall intensity and flood frequency as well as the risk of flood damage due to typhoons during the summer season. Water-friendly facilities such as ecological parks and sports facilities have been established on floodplains of rivers since the river improvement project was implemented and increases in the flood levels of rivers due to typhoons can lead to direct flood damage to such facilities. To analyze the hydraulic influence of these water-friendly facilities on floodplains or to evaluate their stability, numerical analysis should be performed in advance. In addition, it is crucial to address the drying and wetting processes generated by water level fluctuations. This study uses a Nays2D model, which analyzes drying and wetting, to examine its applicability to simple terrain in which such fluctuations occur and to natural rivers in which drying occurs. The results of applying this model to sites of actual typhoon events are compared with values measured at water level observatories. Through this comparison, it is determined that values of coefficient of determination ($R^2$), mean absolute error (MAE), and root-mean-square error (RMSE) are 0.988, 0.208, and 0.239, respectively, thus showing a statistically high correlation. In addition, the results are used to calculate flood risk indices for evaluation of such risk for water-friendly facilities constructed on floodplains. |