Question

The following jobs are waiting to be processed at Rick? Solano's machine center.? Solano's machine center...

The following jobs are waiting to be processed at Rick? Solano's machine center.? Solano's machine center has a relatively long backlog and sets a fresh schedule every 2? weeks, which does not disturb earlier schedules. Below are the jobs to be scheduled? today, which is day 241 ?(day 241 is a work? day). Job names refer to names of clients and contract numbers. Compute all times based on initiating work on day 241.

(Job) (Date Job Received) (Due Date Duration (days))

BR-02 225 270 25

CX-01 230 320 35

DE-06 235 360 40

RG-05 231 310 30

SY-11 228 300 15

Using the LPT? (longest processing? time) decision rule for sequencing the? jobs, the order is? (to resolve a? tie, use the order in which the jobs were? received):

The average tardiness? (job lateness) for the sequence developed using the LPT rule? =

The percentage utilization for the sequence developed using the LPT rule? =

The average completion time for the sequence developed using the LPT rule? =

The average number of jobs in the system for the sequence developed using the LPT rule? =

Critical Ratio? (CR) for each job is given by the? relationship:= (Due Date-Date Today) / (Processing Time). what is CR for jobs a-e

.

Using the Critical Ratio? (CR) scheduling rule for sequencing the? jobs, the order? is:

.

Homework Answers

Answer #1

Scheduling as per LPT rule -

Job Date
received
Process
time
Due date Order Flow time End time Lateness
DE-06 235 40 360 1 40 280 0
CX-01 230 35 320 2 75 315 0
RG-05 231 30 310 3 105 345 35
BR-02 225 25 270 4 130 370 100
SY-11 228 15 300 5 145 385 85
TOTAL 145 495 1695 220
AVERAGE 99 339 44

Average tardiness = 44

Utilization = 145/495 = 29.29%

Average completion time = 339

Average jobs in the system = 495/145 = 3.41

Scheduling as per the Critical Ratio -

Job Date
received
Process
time
Due date Critical ratio Order
BR-02 225 25 270 1.16 1
CX-01 230 35 320 2.26 2
RG-05 231 30 310 2.30 3
DE-06 235 40 360 2.98 4
SY-11 228 15 300 3.93 5
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