A restaurant has a cashier unit with average service time is 2 minutes per customer with standard deviation is 1 minutes. Based on previous observation, there are in average 15 customers come to the cashier. If one customer requires space area 70cm x 50cm and the cashier unit requires 100cm x 100cms, determine total space required for the cashier unit including customers who waiting for service.
@@kangambangunga1419 i think its bc they are refulling with more fuel in the tank, they are trying to refuel more often. so if 15 people every hour have used half of their tank and go refulling, it means that 30 people every hour have used a forth of their tank and then go refulling. it doesnt make sense irl, but it should be what she meant
@Saeideh Fallah Fini or other viewers, I posted this message in clip 8 and 7, but I think more people will see it if I post it here. Can anybody suggest in which order shall I watch these clips? I watched the clip 7, Introduction to Queuing Theory, because the name is self explanatory, but I dont know what's next. Much appreciate it.
The average response time on a database system is five seconds. During a one minute observation interval, the idle time on the system was measured to be twelve seconds. Using an M/M/1 model for the system, determine the following: - System utilization - Average service time per query - Number of queries completed during the observation interval - Average number of jobs in the system - Probability of number of jobs in the system being greater than 10
Thank you so much for such a nice examples. I have a question, if you could please answer. As per the M/M1 Queue, the delay is 1/μC−λ. Here if λ is greater than μC, the delay will be a negative value. How do you explain this?
I am not sure what is C in your formula, but in M/M/1 systems "Delay in system" or W is defined as 1/(μ−λ). As you can see if λ>=μ, then W is meaningless. Note that in a M/M/1 system we always want 0
@ ah i see, that makes sense, I recently got this problem and I’m trying to find the relevant course: “suppose there are two queues A and B, A has average processing time of 3 mins, B 4 mins, any 1 job will goes to whichever queue available, initially both queues are available, if there are 10 jobs ahead of me, what should I see on my countdown timer (estimated waiting time) as the 11th job in the queue”, do you know which topic I should look into?
The average response time on a database system is five seconds. During a one minute observation interval, the idle time on the system was measured to be twelve seconds. Using an M/M/1 model for the system, determine the following: - System utilization - Average service time per query - Number of queries completed during the observation interval - Average number of jobs in the system - Probability of number of jobs in the system being greater than 10
The average response time on a database system is five seconds. During a one minute observation interval, the idle time on the system was measured to be twelve seconds. Using an M/M/1 model for the system, determine the following: - System utilization - Average service time per query - Number of queries completed during the observation interval - Average number of jobs in the system - Probability of number of jobs in the system being greater than 10
4:17 why did you multiply by 2, any calculations or just assumptions made
A restaurant has a cashier unit with average service time is 2 minutes per customer with standard deviation is 1 minutes. Based on previous observation, there are in average 15 customers come to the cashier. If one customer requires space area 70cm x 50cm and the cashier unit requires 100cm x 100cms, determine total space required for the cashier unit including customers who waiting for service.
Video 4:29: I don't understand why you multiply with 2 when tanks are 1/4 empty
idk too bro
@@whitneyvivian1422 same
@@kangambangunga1419 i think its bc they are refulling with more fuel in the tank, they are trying to refuel more often. so if 15 people every hour have used half of their tank and go refulling, it means that 30 people every hour have used a forth of their tank and then go refulling. it doesnt make sense irl, but it should be what she meant
@Saeideh Fallah Fini or other viewers, I posted this message in clip 8 and 7, but I think more people will see it if I post it here. Can anybody suggest in which order shall I watch these clips? I watched the clip 7, Introduction to Queuing Theory, because the name is self explanatory, but I dont know what's next. Much appreciate it.
clip 7,6,5,4,2,1,3,17,16,15,14,13,12,10,9,8
The average response time on a database system is five
seconds. During a one minute observation interval, the
idle time on the system was measured to be twelve
seconds. Using an M/M/1 model for the system,
determine the following:
- System utilization
- Average service time per query
- Number of queries completed during the observation
interval
- Average number of jobs in the system
- Probability of number of jobs in the system being
greater than 10
what is the order of the video i should watch.. The playlist is out of order
nice presentation. could you give me some information on how to change bidimensional into single dimension for example p(i,j)(i,j) to P(i,j)
Hello, for the Mcdonald's example, is there a typo on the slides? It should be "receives" an average of 10,000 pounds of potatoes, not "uses" ?
why you multipled by 2 in panic example
I dont get that either
Me too
Thank you so much for such a nice examples. I have a question, if you could please answer. As per the M/M1 Queue, the delay is 1/μC−λ. Here if λ is greater than μC, the delay will be a negative value. How do you explain this?
I am not sure what is C in your formula, but in M/M/1 systems "Delay in system" or W is defined as 1/(μ−λ). As you can see if λ>=μ, then W is meaningless. Note that in a M/M/1 system we always want 0
@@saeidehfallahfini1173 Perfectly makes sense. Thank you so much. So nice of you.
very good. thank u so much!
Which major in university has this subject? Is it math or computer science?
Industrial engineering, in operations research class
@ ah i see, that makes sense, I recently got this problem and I’m trying to find the relevant course: “suppose there are two queues A and B, A has average processing time of 3 mins, B 4 mins, any 1 job will goes to whichever queue available, initially both queues are available, if there are 10 jobs ahead of me, what should I see on my countdown timer (estimated waiting time) as the 11th job in the queue”, do you know which topic I should look into?
Can anybody tell what the textbook is?
W. L. Winston, Operations Research, Application and Algorithms, 4th Edition, Thomson Learning (Brooks/Cole Publishing Co)
@@saeidehfallahfini1173 Thank you so much, Professor Fini.
poggers
The average response time on a database system is five
seconds. During a one minute observation interval, the
idle time on the system was measured to be twelve
seconds. Using an M/M/1 model for the system,
determine the following:
- System utilization
- Average service time per query
- Number of queries completed during the observation
interval
- Average number of jobs in the system
- Probability of number of jobs in the system being
greater than 10
The average response time on a database system is five
seconds. During a one minute observation interval, the
idle time on the system was measured to be twelve
seconds. Using an M/M/1 model for the system,
determine the following:
- System utilization
- Average service time per query
- Number of queries completed during the observation
interval
- Average number of jobs in the system
- Probability of number of jobs in the system being
greater than 10