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Learning Simio Lab Series 1 Lab Module 01 Evaluating Potential Modifications to a Driver’s License Facility Copyright © 2013 - Jeffrey S. Smith | All Rights.

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Presentation on theme: "Learning Simio Lab Series 1 Lab Module 01 Evaluating Potential Modifications to a Driver’s License Facility Copyright © 2013 - Jeffrey S. Smith | All Rights."— Presentation transcript:

1 Learning Simio Lab Series 1 Lab Module 01 Evaluating Potential Modifications to a Driver’s License Facility Copyright © Jeffrey S. Smith | All Rights Reserved 1

2 Objectives and Outline Objectives –Learn the basics of: The Simio user-interface Modeling in Simio Using the Simio Pivot Grid Outline 1.Description of the system to be modeled 2.Introduction to the Simio user interface 3.Model the “current” configuration 4.Experiment and verify the current model 5.Model the “proposed” configuration 6.In-lab and take-home assignments Copyright © Jeffrey S. Smith | All Rights Reserved2 Video 1 Video 2 Video 4 Video 5 Video 3

3 Drivers’ License Office Written Exam The written exam is administered by one of two exam clerks. When an applicant arrives, s/he waits for an available clerk and, once one is available, takes the exam with the clerk. The exam requires approximately 8.8 minutes. Check Out At check-out, the applicant completes the process using one of two check-out computers and receives his/her temporary license. Check-out takes approximately 9 minutes. Check In At check-in, a single clerk checks the applicant’s driving history (if any) and gives the applicant the initial paperwork. Check-in takes approximately 5 minutes. Applicants arrive at a rate of approximately 10/hour. Performance Metrics: Server Utilizations Time In System Number In System Copyright © Jeffrey S. Smith | All Rights Reserved3

4 Simio User Interface Files Menu Ribbons Project Tabs Libraries Project Current Model Properties Facility View Copyright © Jeffrey S. Smith | All Rights Reserved4

5 Simio Standard Library Source:Generate entities of a specified type and arrival pattern. Sink:Destroy entities. Server:Capacitated process, such as a machine. Workstation:Capacitated process, includes setup, process, tear-down. Combiner:Batches entities with a parent entity (e.g., pallet). Separator:Splits batches or copies entities. Resource:Seized/Released by objects. Vehicle:Fixed route or on-demand pickups/drop-offs. Worker:Moveable resource, for stationary and non-stationary tasks. BasicNode:Simple intersection, fixed object input. TransferNode:Change destination/get rides, fixed object output. Connector:Zero travel time. Path:Entities independently move at their own speeds. TimePath:Entities complete travel in a specified time. Conveyor:Accumulating/non-accumulating conveyor devices. Copyright © Jeffrey S. Smith | All Rights Reserved5

6 Drivers’ License Office Written Exam The written exam is administered by one of two exam clerks. When an applicant arrives, s/he waits for an available clerk and, once one is available, takes the exam with the clerk. The exam requires approximately 8.8 minutes. Check Out At check-out, the applicant completes the process using one of two check-out computers and receives his/her temporary license. Check-out takes approximately 9 minutes. Check In At check-in, a single clerk checks the applicant’s driving history (if any) and gives the applicant the initial paperwork. Check-in takes approximately 5 minutes. Applicants arrive at a rate of approximately 10/hour. Performance Metrics: Server Utilizations Time In System Number In System Copyright © Jeffrey S. Smith | All Rights Reserved6

7 Drivers’ License Office So, we need to model: –Applicant arrival process –Check-in process –Exam process –Check-out process –Applicant departure process –Applicant transfer between processes Source Sink Server Path Copyright © Jeffrey S. Smith | All Rights Reserved7

8 Build the Initial Model! Copyright © Jeffrey S. Smith | All Rights Reserved8

9 Object Hierarchy - The Family of “Objects” Object Definition Object Instance Object Runspace (Realization) Copyright © Jeffrey S. Smith | All Rights Reserved9

10 Initial Object Properties Source1 (Source) –Interarrival Time: Random.Exponential(6) ; units: Minutes CheckIn (Server) –Initial Capacity: 1 (default) –Processing Time: Random.Exponential(5) ; units: Minutes Exam (Server) –Initial Capacity: 2 –Processing Time: Random.Exponential(8.8) ; units: Minutes CheckOut (Server) –Initial Capacity: 2 –Processing Time: Random.Exponential(9) ; units: Minutes Sink1 (Sink) –All defaults Copyright © Jeffrey S. Smith | All Rights Reserved10

11 Editing Properties Displayed in Properties Window Defined by object builder Integers, Booleans, rules, expressions, … Expression editor (down arrow at right): Copyright © Jeffrey S. Smith | All Rights Reserved11

12 Drivers’ License Office Written Exam The written exam is administered by one of two exam clerks. When an applicant arrives, s/he waits for an available clerk and, once one is available, takes the exam with the clerk. The exam requires approximately 8.8 minutes. Check Out At check-out, the applicant completes the process using one of two check-out computers and receives his/her temporary license. Check-out takes approximately 9 minutes. Check In At check-in, a single clerk checks the applicant’s driving history (if any) and gives the applicant the initial paperwork. Check-in takes approximately 5 minutes. Applicants arrive at a rate of approximately 10/hour. Performance Metrics: Server Utilizations Time In System Number In System Copyright © Jeffrey S. Smith | All Rights Reserved12

13 Run Length and Pivot Grid Copyright © Jeffrey S. Smith | All Rights Reserved13

14 Expected “Results” – Static Model Arrival Rate (per hr)10 IAT (mins)6 Check-inExamCheck-outOverall Split100.0% Capacity122 Process Time (mins) Process Rate (per hr per unit) Utilization83.3%73.3%75.0% Num at Station (L) Time at Station (W - mins) Copyright © Jeffrey S. Smith | All Rights Reserved14

15 Drivers’ License Office Written Exam The written exam is administered by one of two exam clerks. When an applicant arrives, s/he waits for an available clerk and, once one is available, takes the exam with the clerk. The exam requires approximately 8.8 minutes. Check Out At check-out, the applicant completes the process using one of two check-out computers and receives his/her temporary license. Check-out takes approximately 9 minutes. Check In At check-in, a single clerk checks the applicant’s driving history (if any) and gives the applicant the initial paperwork. Check-in takes approximately 5 minutes. Applicants arrive at a rate of approximately 10/hour. Performance Metrics: Server Utilizations Time In System Number In System Copyright © Jeffrey S. Smith | All Rights Reserved15

16 Proposed System Modification Check In Written Exam Check Out Add an optional “computerized exam kiosk” to replace one of the two clerks. Applicants would have a choice between the exam administered by a human clerk and the computerized exam. The computer kiosk will support two exam-takers at a time. Initially, assume that ½ of the applicants choose the kiosk and that the exam time is the same as with the human clerk. Copyright © Jeffrey S. Smith | All Rights Reserved16

17 Build the Proposed Configuration Model! Copyright © Jeffrey S. Smith | All Rights Reserved17

18 In-Lab Assignment Proposed A - Exponential exam times for both Proposed B – Reduced variance on the exam times: Human – Random.Triangular(6, 8.8, 11.6) Kiosk – Random.Uniform(6, 11.6) Proposed C – Same as B, but send 70% to the kiosk (hint: use Selection Weights on the alternative paths leading from check-in) For each metric, report the average and confidence interval half-width (h) based on 25 replications, each of length 1000 hours with a 500 hour warm-up. Server Utilizations Ck-InM-ExamC-ExamCk-OutNISTIS Current Proposed A Proposed B Proposed C Copyright © Jeffrey S. Smith | All Rights Reserved18

19 Homework Assignment Starting with the “Proposed C” configuration from the in-lab assignment, implement the following exam failure logic: –When an applicant fails the exam, s/he returns to re-take the exam. The applicant should return to the same exam station (either human or computer) Using your modified model, determine the maximum percentage of exam failures that the system can support before becoming unstable (where the exam servers cannot keep up with the arriving applicants). Consider a walk-up bank that that has an ATM, a single teller, and a manager. ATM customers visit the ATM and teller customers visit the teller. 10% of customers (regardless of original type) visit the manager after visiting the ATM or teller. Arrival and service time properties are: – ATM customers arrive at the rate of 10/hour and spend approximately 4 minutes at the ATM – Teller customers arrive at the rate of 5/hour and spend approximately 7 minute at the teller – Customers that visit the manager spend approximately 20 minutes with the manager Run 25 replications for 2000 hours each (no warmup) and determine the server utilizations and the times that the customers spend in the system (ATM customers, teller customers, customers that see the manager) Copyright © Jeffrey S. Smith | All Rights Reserved19


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