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Class: DSES - 6620 Simulation Modeling And Analysis Homework: L3.4 Exercises Name: Kevin Lewelling

Class: DSES - 6620 Simulation Modeling And Analysis Homework: L3.4 Exercises Name: Kevin Lewelling Date: February 6, 2002 1. For the example in Section L3.1 (Fantastic Dan), run the simulation model for a whole year (250 days, 8 hours each day) and answer the following questions:.

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Class: DSES - 6620 Simulation Modeling And Analysis Homework: L3.4 Exercises Name: Kevin Lewelling

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  1. Class: DSES - 6620 Simulation Modeling And Analysis Homework: L3.4 Exercises Name: Kevin Lewelling Date: February 6, 2002 1. For the example in Section L3.1 (Fantastic Dan), run the simulation model for a whole year (250 days, 8 hours each day) and answer the following questions: A. On average, how many customers does Dan serve each day? 52.784 customers B. What is the average number of customers waiting to get a haircut? 7.712 customers What is the maximum? 10 customers C. What is the average time spent by a customer in the salon? 35.048 minutes What is the maximum? 41.433 minutes D. How busy is Dan on average? 99.97% Is it Satisfactory? You’ll have to ask Dan. E. How many chairs should Dan have for customers waiting for a haircut? The max. quantity in the system is 10. Dan is working on 1. Dan should therefore have 10-1 chairs available, or 9 chairs for his customers. 2. If Dan could take exactly nine minutes for each haircut, will it improve the situation? Rework Question 1 and answer parts A through E. A. On average, how many customers does Dan serve each day? 53 customers B. What is the average number of customers waiting to get a haircut? 7.524 customers What is the maximum? 9 customers C. What is the average time spent by a customer in the salon? 35.223 minutes What is the maximum? 39.725 minutes D. How busy is Dan on average? 99.97% Is it Satisfactory? You’ll still have to ask Dan. E. How many chairs should Dan have for customers waiting for a haircut? The max. quantity in the system is 9. Dan is working on 1. Dan should therefore have 9-1 chairs available, or 8 chairs for his customers.

  2. 3. In theArrivals element (table), there are these two items - occurrences and frequency. What is the difference between the two? What is the significance of the Qty each... column? Occurrences defines the number of entities that will be allowed to arrive in a system. The Frequency of the arrival indicates how often an entity will enter the system. The Qty each… column allows the user to enter the number of entities that will arrive at the same time. 4. What are the various time units that you can use while developing a model? Where do you provide this information. Time units can be entered in seconds, minutes, hours and days. They can be selected by going through the Simulation pull-down menu and clicking on Options. 5. The Processing element has two tables that need to be edited. What are their names and what are their functions? The table names are Process and Rounting. The Process table allows the user to define the routing through the system as well as what operations will take place for theentities at each location. The Routing table allows the user to specify the entity type and quantity resulting from an operation at a location. 6. When an entity has completed all the processing in the system, what should we do with it? Where should it be routed? We should tell the system to allow the entity to exit the system. It should routed out of the system to wherever it is required next, maybe to be shipped. 7. Differences between the following: A. Entity versus Locations. Entities are the items that are processed in the system. Locations are fixed places in the system where entities are processed, queued, or have a decision made about further routing. B. Locations versus Variables. Variables are typically used for making decisions or for gathering data. Variables are implemented at Locations. C. Attributes versus Variables Attributes function as variables that are specifically associated with individual locations or entites. Variables may change during the process however attributes remain fixed. D. Subroutines versus Macros. A subroutine is a user defined command that can be called to perform logic and optionally return a value. A macro acts like a subroutine however it is different in that it cannot pass or return a value. E. Table Functions versus Arrays. Table functions provide ans easy and convenient way to retrieve a value based on an argument that is passed to the table. Arrays also provide as way to retrieve data. Unlike a Table function, data reference is based on location in the array, not an argument. F. Save versus Save As. Save saves the file with its existing file name in its existing location. Save As allows the user to change the name and the location of the file.

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