Table 3.
Functions costs distribution matrix for redesigning a face shield.
| No. | Main constructing features | F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8 | F9 | F10 | Feature cost* |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Main body frame | 1 | 1 | - | 1.92 | 1.1 | 0.53 | 0.72 | 1 | 0.75 | 1.2 | 9.22 |
| 2. | Coronal plane positioning system | 1 | 0.56 | 1.74 | 1 | - | 0.46 | 0.4 | 0.54 | 0.3 | 0.8 | 6.8 |
| 3. | Shield orientation and fixing system | 0.2 | - | - | 0.6 | 1.6 | - | 0.2 | - | 0.2 | 0.5 | 3.3 |
| 4. | Lateral gripping features | 0.5 | 0.2 | 1.74 | - | 0.3 | 0.41 | 0.4 | 0.46 | 0.7 | 0.5 | - |
| 5. | Forehead stabilizing rest | 0.5 | 0.5 | 1 | 1.6 | 0.3 | 0.5 | 0.8 | 1 | 0.75 | 1 | 7.95 |
| Total cost | 3.2 | 2.26 | 4.48 | 5.12 | 3.3 | 1.9 | 2.52 | 3 | 2.7 | 4 | 32.48 | |
| Ratio | 0.09852 | 0.06958 | 0.13793 | 0.15763 | 0.1016 | 0.05849 | 0.07758 | 0.09236 | 0.08312 | 0.12315 | 1 | |
| Cost of functions (%) | 9.852 | 6.958 | 13.793 | 15.763 | 10.16 | 5.849 | 7.758 | 9.236 | 8.312 | 12.315 | 100 | |