Research Article
Modeling Spare Parts Demands Forecast under Two-Dimensional Preventive Maintenance Policy
Table 3
The comparison between the forecast results and optimization results.
| Usage type | Need for oil filter before optimization | Need for oil filter after optimization |
| Low usage rate | 1.390 | >0.135 | Moderate usage rate | 0.562 | >0.399 | High usage rate | 1.861 | >0.950 |
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