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Department
Operations Management
Course
OPER 1021
Professor
Sonmez
Semester
Spring

Description
Chp 4: Flow Time Analysis  Application of Little’s Law focusing on Flow Time (T)  Critical Path:   Longest Path from Start to Finish of the process  Determines the flow time of the process  Activities on Critical path called Critical activities  Theoretical Flow time:  minimum  time for a flow unit to flow through the process, without any  waiting or interruptions:  Flow time efficiency = Theoretical Flow Time / Flow time  CPM Method:  Longest path – Critical Path – gives flow time of the process  Earliest Start Time – Earliest Finish Time  Latest Start Time – Latest Earliest Finish Time Slack: LFT – EFT or LST – EST   Critical Path Activities ZERO Slack  Other  activities  can be delayed  by  slack  amount  without  delaying  the  project/process  Process Flow Time can be shortened by focusing on Critical Path CHP 5: Flow Rate and Capacity Analysis  Capacity = Maximum sustainable flow rate  Capacity of a resource pool: c * (1/Tp)  Bottleneck  is the  “slowest”  resource pool of the process. Thus, we define the  effective capacity of a process as the effective capacity of the bottleneck  Capacity Utilization: Throughput / Capacity CHP 8: Managing flow variability: Safety capacity (Waiting Lines Management)  Reasons of Waiting Lines  Not enough capacity  Variability  Services cannot be stored  Capacity utilization, u=R/ p , is the average fraction of the server pool that is busy  processing customers.  In a stable system R=the arrival rate (which is on average lesp than R ,)  Safety capacity, s =p  – R, is the excess processing capacity available to process the  customers arrivals.  Flow time efficiency, e=p /T, is the proportion of time that a customer spends being  served rather than waiting in a queue.  The theoretical flow time =p  * Little’s Law is not sufficient to calculate I because the average waiting time is unknown.  2( c + 1)C 2 + C 2 Therefore, use the PK forIi=a: u × i p 1 − u 2 Ciand Cp are the Coefficients of Variation=  (Standard Deviatio
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