Concept explainers
A.
Interpretation: The mean flow time and weighted mean flow time have to be computed if the patients are
Concept Introduction:
FCFS basis- Normally, there is a process in attending the jobs or, customers. FCFS basis means attending a job or customer on First come first serve basis. In other words, the job/customer which/who comes first is attended first.
b.
Interpretation: The mean flow time and weighted mean flow time have to be computed if the patients are scheduled of SPT sequencing.
Concept Introduction:
SPT: SPT when expanded becomes shortest processing time. In the rule, the jobs must be arranged in increasing order according to the processing time.
c.
Interpretation: A suitable sequence has to be made that provides a lower weighted mean flow time value than FCFS and SPT sequencing.
Concept Introduction:
Optimal sequence: It is supposed to be sequence or series of jobs that has to take place to minimize the idle time and at the same time all the jobs are completed.
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EBK PRODUCTION AND OPERATIONS ANALYSIS
- 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 received during the previous 2 weeks. They are ready to be scheduled today, which is day 241 (day 241 is a workday). Job names refer to names of clients and contract numbers. Job Date job received Productiondays needed Date job due BR-02 228 15 300 CX-01 225 25 270 DE-06 230 35 320 RG-05 235 40 360 SY-11 231 30 310 a. Complete the following table. (Show your supporting calculations.) b.Which dispatching rule has the best score for flow time? c. Which dispatching rule would you select? Support your decision.arrow_forwardThe SOT rule provides an optimal solution in a number of evaluation criteria. Should the manager of a bank use the SOT rule as a priority rule? Why?arrow_forwardUsing the FCFS rule for scheduling, the sequence is 1-2-3 For the schedule developed using the FCFS rule, the total length of time taken to complete the three suits (including delivery) : hours (enter your response as a whole number). = G Sunny Park Tailors has been asked to make three different types of wedding suits for separate customers. The table below highlights the time taken in hours for cutting and sewing (process 1) and delivery (process 2) of each of the suits. Times Taken for Different Activities (hours) Cut and Sew 3 5 6 Suit 1 2 7 3 Deliver 4 2 ∞ N 8 Assume that orders for suits have been listed in the above table in the order in which they were received.arrow_forward
- The first five columns of the following table contain information about a set of four jobs that just arrived (end of Hour 0 or beginning of Hour 1) at an engine lathe. They are the only ones now waiting to be processed. Several operations, including the one at the engine lathe, remain to be done on each job. Determine the schedule by using (a) the CR rule and (b) the S/RO rule. Compare these schedules to those generated by FCFS, SPT, and EDD. Job ProcessingTime at EngineLathe (hours) TimeRemainingUntil Due Date(days) Number ofOperationsRemaining Shop TimeRemaining(days) CR S/RO 1 2 3 4 2.3 10.5 6.2 15.6 15 10 20 8 10 2 12 5 6.1 7.8 14.5 10.2 2.46 1.28 1.38 0.78 0.89 1.10 0.46 -0.44arrow_forwardTB MC Qu. 16-80 The owner/operator of the local franchise of... The owner/operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received: Job W X Y Z Processing Due Time (hrs) (hrs from now) 5 4 T 4 5 2 2 1 1 If he uses the earliest due date first priority rule to schedule these jobs, what will be the average job tardiness? Multiple Choice O O O 3 hours 2 hours 0 hours 4 hoursarrow_forwardIn a variety of test criteria, the SOT rule contains the best solution. Should the SOT rule be used as a priority rule by a bank's manager? What is the reason for this?arrow_forward
- What are the benefits and drawbacks of the shortest processing time rule (SPT)?arrow_forwardAt the University Hospital, five blood samples must be scheduled through a blood-testing laboratory. Each sample goes through up to four different testing stations. The times for each test and the due dates for each sample are as follows: Sample Test Station/Hours Due Date (hours) 1 A/1, B/2, C/3, D/1 6 2 B/2, C/3, A/1, D/4 10 3 C/2, A/3, D/1, C/2 8 4 A/2, D/2, C/3, B/1 14 5 D/2, C/1, A/2, B/4 12 a. Using a Gantt chart, schedule these five samples; schedule them in priority order of earliest due date first. b. Assume that the capacity of each test station (A, B, C, and D) is doubled. Prepare an FCS for this…arrow_forwardMike’s Auto Body Shop has five cars waiting to be repaired. The shop is quite small, so only one car can be repaired at a time. The number of days required to repair each car and the promised date for each are given in the following table. (given) Mike has agreed to provide a rental car to each customer whose car is not repaired on time. Compare the performance of the four sequencing rules FCFS, SPT, EDD, and CR relative to minimizing average tardiness.arrow_forward
- Jane Reed bakes breads and cakes in her home for parties and other affairs on a contract basis. Jane has only one oven for baking. One particular Monday morning she finds that she has agreed to complete five jobs for that day. Her husband John will make the deliveries, which require about 15 minutes each. Suppose that she begins baking at 8:00 A.M. (given) Determine the sequence in which she should perform the jobs in order tominimizea. Mean flow time.b. Number of tardy jobs.c. Maximum lateness.arrow_forwardThere are six jobs as below. The processing time (in days) and due date for each job are below. Job |arrow_forwardWhat are the advantages and disadvantages of the shortest processing time (SPT) rule?arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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