Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
35 Cards in this Set
- Front
- Back
System |
Collection of elements that work together for a common goal |
|
System Elements |
-Entities -Resources -Activities -Controls |
|
Entities |
Items processes through system (Products, Customers, Documents) |
|
Resources |
The means by which activities are performed |
|
Activities |
Tasks performed in the system that are either directly or indirectly involved in processing entities |
|
Controls |
Restraints on how, when, and where activities are performed |
|
Bounded Rationality |
Our limited ability to grasp real-world complexity |
|
Interdependencies |
Relationships that cause the behavior of one element to affect other elements |
|
Variability |
Characteristic inherent in systems involving humans and machinery |
|
System Performance Metrics |
-Flow Time -Utilization -Value-added Time -Waiting Time -Flow Rate -Inventory or Queue Levels -Yield -Customer Responsiveness -Variance |
|
Flow Time |
Average time it takes an entities to be processes through the system |
|
Utilization |
Percentage of scheduled time resources are in productive use |
|
Value-added Time |
The amount of time an entity spends being in process for an operation that a customer is willing to pay for |
|
Waiting Time |
Amount of time entities spend waiting to be processed |
|
Flow Rate |
Entities produced or serviced per unit of time |
|
Inventory/Queue Levels |
Number of entities in storage or waiting areas |
|
Yield |
Percentage of acceptable entities as a percentage of total entities that originally entered the system |
|
Customer Responsiveness |
Ability of system to service entities to minimize waiting time |
|
Variance |
Degree of fluctuation of metrics |
|
System Variables |
-Decision Variables Response Variables -State Variables |
|
Decision Variables |
Input factors. Independent variables. Maybe controllable or uncontrollable. |
|
Response Variables |
Performance/Output Variables. Dependent variable. |
|
State Variables |
Indicate the status of the system at any specific point in time |
|
Systems Engineering |
System design and process improvement. |
|
A/B/s |
A: Type of interarrival distribution B: Type of service time distribution s: Number of servers |
|
Arrival Time |
λ |
|
Service Rate |
μ |
|
Mean Interarrival Time |
1/λ |
|
Mean Service Time |
1/μ |
|
Traffic Intensity |
λ / μ =ρ |
|
L |
Expected number of entities in the system λω λ / (μ-λ) |
|
Lq |
Expected number of entities in the queue λ ωq ρ^2 / (1-ρ) |
|
ω |
Expected time in the system |
|
ωq |
Expected time in the queue (Waiting time) |
|
Pn |
Probability of exactly n customers in the system |