# DSS Use Cases

## Use Case for Pressure Factor Calculations

### Definitions

```A - total allocated time [hrs]
O - total observed time [hrs]
f - fractional observed time = 1 - O/A
d - done time [hrs]
r - residue time [hrs]
n - total time = d + r [hrs]
pf - pressure factor = 1 + ln(n/d)
```

### X-band Case

We have a total of 100 hours allocated over a year for X-band from 3 sessions. About 80% of the time is used.

• Sessions
• Tom: 40 hrs starting in 6A
• Dick: 30 hrs starting in 6B
• Harry: 30 hrs starting in 6C

• Periods
• Tom
• 5 hrs at 2006 03 24 0 0 0
• 12 hrs at 2006 04 10 0 0 0
• 4 hrs at 2006 06 12 0 0 0
• 1 hrs at 2006 11 11 0 0 0
• Dick
• 14 hrs at 2006 07 14 0 0 0
• 15 hrs at 2006 11 11 0 0 0
• Harry
• 10 hrs at 2006 11 11 0 0 0
• 7 hrs at 2006 12 10 0 0 0
• 12 hrs at 2006 12 25 0 0 0

• Results

Time A O f d r n pf
2006 02 01 0 0 0 100 0 1.0 0 40 40 4.69
2006 03 25 0 0 0 100 5 0.95 5 35 40 3.08
2006 04 11 0 0 0 100 17 0.83 17 23 40 1.86

2006 06 01 0 0 0 100 17 0.83 0 53 53 4.97
2006 06 13 0 0 0 100 21 0.79 4 49 53 3.58
2006 07 15 0 0 0 100 35 0.65 18 35 53 2.08

2006 10 01 0 0 0 100 35 0.65 0 65 65 5.17
2006 11 12 0 0 0 100 61 0.39 26 39 65 1.92
2006 12 11 0 0 0 100 68 0.32 33 32 65 1.68
2006 12 26 0 0 0 100 80 0.20 45 20 65 1.37

### Ka-band Case

We have a total of 200 hours allocated over the year for Ka-band in three session. About 40% of the time is used.

• Sessions
• Tom: 80 hrs at Ka-band starting in 6A
• Dick: 60 hrs at Ka-band starting in 6B
• Harry: 60 hrs at Ka-band starting in 6C

• Periods
• Tom
• 5 hrs at 2006 03 24 0 0 0
• 12 hrs at 2006 04 10 0 0 0
• 4 hrs at 2006 06 12 0 0 0
• 1 hrs at 2006 11 11 0 0 0
• Dick
• 14 hrs at 2006 07 14 0 0 0
• 15 hrs at 2006 11 11 0 0 0
• Harry
• 10 hrs at 2006 11 11 0 0 0
• 7 hrs at 2006 12 10 0 0 0
• 12 hrs at 2006 12 25 0 0 0

• Results

Time A O f d r n pf
2006 02 01 0 0 0 200 0 1.0 0 80 80 5.38
2006 03 25 0 0 0 200 5 0.975 5 75 80 3.77
2006 04 11 0 0 0 200 17 0.915 17 63 80 2.55

2006 06 01 0 0 0 200 17 0.915 0 123 123 5.81
2006 06 13 0 0 0 200 21 0.895 4 119 123 4.43
2006 07 15 0 0 0 200 35 0.825 18 105 123 2.92

2006 10 01 0 0 0 200 35 0.825 0 165 165 6.10
2006 11 12 0 0 0 200 61 0.695 26 139 165 2.85
2006 12 11 0 0 0 200 68 0.660 33 132 165 2.61
2006 12 26 0 0 0 200 80 0.600 45 120 165 2.30

-- DanaBalser - 2010-09-07
Topic revision: r1 - 2010-09-07, DanaBalser
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