Garage Location Selection for Public Transportation System in Istanbul
Read this article. The study covered uses various tools to determine the best location for bus garages to operate including maintenance and repair activities. Focus on Figure 1 in the Methodology section as it visually demonstrates the analytical process.
Application
Scenario Analysis
Scenario analysis is conducted to see the results when some parameters are changed. In this study, scenario analysis has been made by changing the weights of main criteria and subcriteria in seven different scenarios.
Table 13 The results of scenarios for both sides of Istanbul.
*refers the most appropriate alternatives for the location selection.
In current application, the criteria weights are handled by fuzzy AHP. In each scenario, current weight of a chosen main criterion is increased and the remaining criteria are fixed to their current values. Then new weights are normalized. For example, in scenario 1, the current weight of "Cost" main criterion is increased 25 times and the changed weights of the criteria are normalized, as shown in Table 12. The result of the weighted fuzzy AD brought "Beylikdüzü" to the first order (Table 13). Also the definitions of other scenarios and the obtained results are shown in Tables 12 and 13, respectively.
Table 12 The weights of each criterion for each scenario.
| Scenario | Definition | W 1 | W 2 |
W 3 |
W 4 |
W 5 |
W 6 |
Total |
|---|---|---|---|---|---|---|---|---|
| 1 | W 1 is increased 25 times |
0.606 | 0.139 | 0.02 | 0.029 | 0.053 | 0.153 | 1.000 |
| 2 | W 3 is increased 10 times |
0.05 | 0.229 | 0.337 | 0.047 | 0.086 | 0.251 | 1.000 |
| 3 | W 4 is increased 5 times |
0.056 | 0.258 | 0.038 | 0.267 | 0.098 | 0.284 | 1.000 |
| 4 | W 5 is increased 40 times |
0.012 | 0.056 | 0.008 | 0.012 | 0.85 | 0.062 | 1.000 |
| 5 | W 2 is increased 10 times |
0.029 | 0.134 | 0.02 | 0.028 | 0.051 | 0.738 | 1.000 |
| 6 | W 3 is increased 20 times |
0.037 | 0.171 | 0.504 | 0.035 | 0.065 | 0.188 | 1.000 |
| 7 | W 6 is increased 5 times |
0.029 | 0.134 | 0.02 | 0.028 | 0.051 | 0.738 | 1.000 |
| Alternatives | European Side | Asian Side | ||||||
|---|---|---|---|---|---|---|---|---|
| Scenario 1 |
Scenario 2 | Scenario 3 | Scenario 4 | Alternatives |
Scenario 5 |
Scenario 6 |
Scenario 7 |
|
| Beylikdüzü | 5.233* | 5.379* | 5.593 | 6.086 | Pendik | 5.298* | 5.385 | 6.035* |
| Arnavutköy | 5.255 | 5.393 |
5.497 | 5.400 | Sultanbeyli | 5.332 | 5.277 | 6.138 |
| Silivri | 5.425 | 5.416 | 5.397* | 5.399* | Tuzla | 5.375 | 5.275* | 6.180 |
*refers the most appropriate alternatives for the location selection.