Home
Subjects
Explanations
Create
Study sets, textbooks, questions
Log in
Sign up
Upgrade to remove ads
Only $35.99/year
IE 383 Final Exam
STUDY
Flashcards
Learn
Write
Spell
Test
PLAY
Match
Gravity
Terms in this set (33)
True or False: Median condition applies to rectilinear distance and minisum problems
True. When the problem is a rectilinear minisum problem, the median condition applies. When the problem is a straight line minisum problem, the center of gravity method applies. When the problem is a minimax and straight line problem, the circle shape graphing method is used. When the problem is a rectilinear minimax problem, the diamond method can be used.
Products follow a flow from Machine 1 to Machine 2 to Machine 3. They all have the same scrap rate and the same processing time (10 minutes). Which machine will have the lowest machine utilization
Machine 3
What are the three inputs of MRP?
Elements of MRP Table:
GR - Gross Requirement
SR - Scheduled Receipts
BI - Beginning Inventory
NR - Net Requirements
POR - Planned Order Receipts
Inputs are GR, SR, and BI
What is the formula for Mean Absolute Deviation? (MAD)
MAD = sum(actual - predicted) / N
What is the formula for Mean Squared Error?
MSE = sum[(actual - predicted)^2] / N
What is the formula for Mean Absolute Percent Error?
MAP = (100/N)(sum[(actual - predicted) / actual])
What are the basic layout types?
Single Machine, Machine Flow Shop, Job Shop, Group Technology
Be able to look at a group technology matrix (finished) and tell which parts belong to the same family
lol theres no answer for this just do it
What are the 4 principles/rights of material handling?
1) Right material in the 2) right amount in the 3) right place at the 4) right time
Select all that apply:
a) median condition applies to rectilinear distance and minisum
b) Diamond shape method applies to straight-line distance and minisum problem
c) Circle shape method applies to straight-line distance and minimax problem
d) center of gravity applies to rectilinear distance and minimax problems
A & C.
Minisum Straight Line: COG
Minisum Rectilinear: Median
Minimax Straight Line: Circle
Minimax Rectilinear: Diamond
In order to use the EOQ Model formula, which of the following assumptions must be made?
a) Demand is known with certainty and is relatively constant over time
b) No shortages are allowed
c) Lead-time for the receipt of orders is constant
d) The order quantity is received all at once
e) The items must be made (manufactured) in the factory
Assumptions of the classic EOQ Model:
1) Order cost is constant
2) Demand is constant
3) Lead time is constant
4) Price is constant
5) The optimal plan is calculated for only one product.
6) The order quantity is received all at once
7) No shortage
So, the answer is A, B, C, and D.
CRAFT procedure
Calculate distances between all departments that don't have 0's in the from-to-chart using centroid distance. Then calculate the sum of the flow x distance, lower numbers are better.
CORELAP procedure
Calculate total TCU by summing the rows for each department. Highest TCU is first. A relation with the first department is next. If not, E relation with first department, etc. Third is E relation with first department. If not, E relation with second department. If not, I relation with first dept., etc.
ALDEP procedure
Reward for close proximity. Pick one randomly to go first, then pick the second one by choosing the number that has the highest relationship with the first one (A if possible). Pick the third one by choosing the number that has the highest relationship with the second one. Lay out the sequence in blocks starting from the top, in a sweeping motion. Find letter relation of the departments that touch each other. Multiply each letter value by 2 and add them. Higher scores are better.
Critical Ratio formula
time remaining / work remaining
= (due date - current time) / work remaining
how to minimize mean flow time
order them from lowest to highest process time
how to minimize maximum tardiness
sort them from lowest to highest due date
mean flow time formula
sum(completion time - arrival time) / # of jobs
mean tardiness formula
sum(tardiness) / # of jobs
variables for optimal order quantity calculation
D = Demand
iC = Cost per unit or inventory holding cost
A = ordering cost
Smax = max shortate
w = fixed shortage cost
w1 = variable shortage cost
p = production/delivery rate
total annual inventory costs formula
iCQ/2 + iC(safety stock)
operating days between orders formula
Q/D
reorder point in units
Demand x (Lead Time / Operating Days) + Safety Stock
three types of linear programming constraints
1) workforce
Wt = Wt-1 + Ht -Ft
W0 = given value
2) inventory
It = It-1 + Pt + St - Dt
I0 = given value
In = sometimes given value
3) workforce-production
Pt = KnWt + Ot - Ut
+ any problem constraints
Yhat and Ydouble hat equation
Yhat = alpha(Y(t)) + (1 - alpha)(Yhat(t-1))
Ydoublehat = alpha(Yhat(t)) + (1 - alpha)(Ydoublehat(t-1))
linear regression method
linear model - plug in values to given equations for a and b, use values to estimate
exponential model - convert to exponential by taking the natural log of all Y(t) values, plug in values to given equations for a and b, use values to estimate, convert back to regular numbers
constant model - plug in values to given equations for a and b, very last value is best estimate
exponential smoothing method
linear model - estimate a and b. a = Y(1) and b is the slope of Y(10) and Y(1). calculate Yhat(1) and Ydoublehat(1) using linear equations for relationship. Make table using equations for Yhat and Ydoublehat. calculate a(n) and b(n) using system of equations. calculate Yhat(n) using Yhat(t) = a(t) + b(t)(t-last value on table)
exponential model - literally same as linear model just convert everything to ln a
constant model - same as linear regression method
center of gravity method
x = sum(xi(wi^2))/sum(wi)
y = sum(yi(wi^2))/sum(wi)
heuristic method
flow from greatest to least, distance from least to greatest, select first pair from first number in flow order and second pair from first number in distance order. lower bound is flow x distance in the order you put them in.
max throughput
start with max input on first machine, calculate each individual input from there
max finished goods given input rate
multiply line yield by input amount to check if it's over max throughput. if it isn't divide that number by line yield. if it is, divide max throughput by line yield
machine utilization
finished goods per day x percentage input into machine
average cost to produce one unit of product
average cost / line yield
Other sets by this creator
lm
47 terms
ie2 Exam
8 terms
ieexam
50 terms
exam1IE386
28 terms
Other Quizlet sets
MCQ CH5-9, Other MCQs
1,080 terms
World Civilizations Chapter 1 Test- Hahn
22 terms
Wasserzeichen, Lagen, Textexterne Schreiberzusätze
13 terms
Abnormal Psych Test 3
20 terms
Verified questions
ADVANCED MATH
Given that a is a quadratic residue of the odd prime p, prove the following: (a) a is not a primitive root of p. (b) The integer $p-a$ is a quadratic residue or nonresidue of $p$ according as $p \equiv 1$ $(\bmod 4)$ or $p \equiv 3(\bmod 4) .$ (c) If $p \equiv 3(\bmod 4),$ then $x \equiv \pm a^{(p+1) / 4}(\bmod p)$ are the solutions of the congruence $x^{2} \equiv a(\bmod p)$
ADVANCED MATH
Greg drove from his home in Point Alexander to Belleville at an average speed of 75 km/h. From her home in Chalk River, Claire drove the 18 km to Point Alexander and continued on to Belleville at an average speed of 85 km/h. Greg and Claire left home at the same time. a) After what length of time did Claire pass Greg? b) How far were they from Point Alexander when Claire passed Greg?
ADVANCED MATH
Answer “true” or “false” to the following statements: If the conclusion is in the form “All S are P,” and inspection of the diagram reveals that the part of the S circle that is outside the P circle is shaded, then the argument is valid.
ADVANCED MATH
Consider a geodesic which starts at a point p in the upper part (z > 0) of a hyperboloid of revolution $x^{2}+y^{2}-z^{2}=1$ and makes an angle $\theta$ with the parallel passing through p in such a way that $\cos \theta=1 / r,$ where r is the distance from p to the z axis. Show that by following the geodesic in the direction of decreasing parallels, it approaches asymptotically the parallel $x^{2}+y^{2}=1, z=0$.