Group 6 Homework Chap14 PDF

Preview

Summary

VIET NAM NATIONAL UNIVERSITY – HO CHI MINH CITYINTERNATIONAL UNIVERSITY-----------School of Business AdministrationASSIGNMENT CHAPTER 14COURSE NAME: PRODUCTION & OPERATIONS MANAGEMENTCOURSE ID: BA164WELECTURER: DR. TRƯƠNG QUANG ĐƯỢCDATE OF SUBMISSION: 20/12/CLASS: TUESDAY MORNINGGROUP...

Description

VIET NAM NATIONAL UNIVERSITY – HO CHI MINH CITY INTERNATIONAL UNIVERSITY ----------School of Business Administration

ASSIGNMENT CHAPTER 14 COURSE NAME:

PRODUCTION & OPERATIONS MANAGEMENT

COURSE ID:

BA164WE

LECTURER:

DR. TRƯƠNG QUANG ĐƯỢC

DATE OF SUBMISSION: 20/12/2020 CLASS:

TUESDAY MORNING

GROUP:

06

LIST OF MEMBERS:

VĂN BẠT PHÚC TÀI

BABAWE17149

VƯƠNG NHẬT NAM

BABAWE18605

TRẦN MINH QUÂN

BABAWE18610

NGUYỄN THỊ THUÝ MAI

BABAWE18336

TRẦN THỊ HƯƠNG QUỲNH

BABAWE18452

HỒ SĨ PHÚC

BABAIU18168

TRẦN TRỊNH TÙNG

BABAIU18236

VÕ THĂNG LONG

BABAIU18105

ĐINH PHƯỚC THIỆN

BABAIU18331

1

Exercise 14.1: Exploding the bill of material yields the following: Item J: 200 units Item K: 200*1 = 200 units Item L: 200 * 4 = 800 units Item M: 200*2 = 400 units Exercise 14.3: The demand for subassembly S is 100 units in week 7. Each unit of S requires 1 unit of T and 2 units of U. Each unit of T requires 1 unit of V, 2 units of W, and 1 unit of X. Finally, each unit of U requires 2 units of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, 2 weeks to make Y, and 1 week to make Z. a) Construct a product structure. Identify all levels, parents, and components.

This structure has three levels: 0, 1, and 2. There are three parents: S, T, and U. Each parent item has at least one level below it. Items T, U, V, W, X, Y and Z are components because each item has at least one level above it. In this structure, T, and U are both parents and components. The number in parentheses indicates how many units of that particular item are needed to make the item immediately above it.

2

b) Prepare a time-phased product structure.

Exercise 14.10: a. A gross-requirements plan

3

b. A net materials Lot size

Lead time (weeks)

On hand

Safety Ite stock m _

X1

Lotforlot

B1 1

50

B2

A1 Lotforlot

2

20

_

C

D

E

Lea requirements d time eek

Week 1 Required date Order release date Required date Order release date Required date Order release date Required date Order release date Required date Order release date Required date Order release date Required date (B1) Order release date (B1) Required date (D) Order release date (D)

2

3

4

5

6

7

8

9

50

50

20 10 0

40

50

20

40 0

80 40 0

80 10 0

10 0

40 20 0 10 0 10 0

20

20 0

20 0

40 20 0

40 50

12 10 0

10 0 10 0 20 0

6

7

1 wee k

2 wee ks 1 wee k

50

9

30

11

20

0

0

12 100

0

0

20

100

0

20

100

1 50 wee k 1 wee 20 k

10

0

0

30

40 0

8 50

2 wee 50 ks

3 wee ks

80 40 0

11

10 0

20 10 0

20 10 0 8 0

50 20 10 0

20 0

10 0

20

10 0

50

5 0

50

1 0 2 0

0

20

100

20

100

0

0

0

20

100

20

100

Planned order releases

30

Gross requirements

20

100

100

40

200

Scheduled receipts Lotforlot

Lotforlot

2

1

20

20

_

_

_

_

1

2

B2

A1

Projected on hand

20

20

20

20

20

20

20

20

0

0

0

0

Net requirements

80

40

200

Planned order receipts

80

40

200

Planned order releases

80

40

200

Gross requirements

50

20

100

Scheduled receipts Projected on hand

5

5

5

5

5

5

5

0

0

0

0

0

Net requirements

45

20

100

Planned order receipts

45

20

100

Planned order releases

45

Gross requirements

20

200

100

80

400

Scheduled receipts Lotforlot

1

0

_

_

2

C

Projected on hand

0

0

0

0

1

0

_

_

2

D

0

0

0

0

0

Net requirements

200

80

400

Planned order receipts

200

80

400

Planned order releases Lotforlot

0

200

Gross requirements

80

100

400

40

200

Scheduled receipts Projected on hand

0

6

0

0

0

0

0

0

0

0

0

Net requirements

100

40

200

Planned order receipts

100

40

200

Planned order releases

100

Gross requirements

40

50

200

20

100

Scheduled receipts Lotforlot

3

10

_

_

2

E

Projected on hand

10

3

10

_

_

3

E

10

10

10

10

0

0

0

0

Net requirements

40

20

100

Planned order receipts

40

20

100

Planned order releases Lotforlot

10

Gross requirements Scheduled receipts

7

40

20

100

100

80

400

Projected on hand

0

0

0

0

0

0

0

0

0

Net requirements

100

80

400

Planned order receipts

100

80

400

Planned order releases

8

100

80

400

Exercise 14.11: a. Gross requirements plan for Item C Week

Lead Time

1 2 3 4 5 A . H . C

Required date Order release date Required date Order release date Required date Order release date

6

7

8 100

9

100

10 50

100

12 150

1 week

50

150

100

50

1 week

150

2 week s

100

100

11

50

100

100

50

50

50

50

150

b. Net requirements for item C is shown in the below table Net requirements for item A: Level: 0 Parent: -Lead Item: A Time: 1 1 Gross requirements Projected on-hand Inventory

2

3

4

5

8

9

100 0

0

0

0

0

0

Net requirements Planned order receipts Planned order releases

Net requirements for item H: Level: 0 Item: H

Week 6 7

0

0

0

10

12 15 0

0

0 15 0 15 0

50 0

0

100

50

100

50

10 0

11

15 0

50

Parent: -Lead Time: 1 1

2 9

3

4

5

Week 6 7

8

9

10

11

12

Gross requirements Projected on-hand Inventory Net requirements Planned order receipts Planned order releases

100 0

0

0

0

0

0

0

0

0 100

0

100

0 50

50

Parent: -Lead Time: 2

Item: C

1

50

2

50

3

50

4

Week 6 7 10 0

5

50 50 50 50

Net requirements Planned order receipts Planned order releases

50 50

8

9

10

100

50

50

50

50

50

50

50

50

0

0

50

50

0

0

0

0 10 0

11 15 0

12

50 10 0 10 0

50

Exercise 14.17: Period Gross requirements

1 30

2

3 40

4

5 30

6 70

7 20

8

9 10

10 80

11

12 50

*Holding cost = $2.50/unit/week; setup cost = $150; lead time = 1 week; beginning inventory = 40; stockout cost = $10. Lot – for – lot table:

Period (weeks)

Gross requirements Begin 40 inventory End inventory Net

0

50

100

Net requirement for item C: Level: 1

Gross requirements Projected on-hand Inventory

0

50

1 30

2

3 40

4

5 30

6 70

7 20

8

9 10

10 80

11

12 50

40

10

10

0

0

0

0

0

0

0

0

0

10

10

0 30

0

0 30

0 70

0 20

0

0 10

0 80

0

0 50

10

requirements Order receipts Order releases

30 30

30

30 70

70 20

20 10

10 80

80

50 50

Total relevant cost = Order cost + Holding cost = 7 orders * $150 + 0 = $1050 Exercise 14.18: Annual usage = 330 units for 12 weeks; weekly usage = 330/12=27.5 per week. Therefore, 27.5 units * 52 weeks (annual demand) = 1,430 D = Annual demand = 1,430 S = Setup cost = $150 H = Holding cost on annual per unit = $2.5 * 52 = $130 2∗ D ∗ S = 2∗1,430∗150 =57.44 ≈ 57 units ¿ Q= H 130

√

Period Gross Requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

√

1 30

2 0

3 40

4 0

5 30

6 70

7 20

8 0

9 10

10 80

11 0

12 50

40 0 0

10 0 0

10 30 57

27 0 0

27 3 57

54 16 57

41 0 0

21 0 0

21 0 0

11 69 114

45 0 0

45 5 57

0

57

0

57

57

0

0

0

114

0

57

0

Total projected on hand=10 + 10 + 27 + 27 +54 + 41+ 21 + 21 + 11 + 45 + 45=312 units Holdingcost =312 units∗$ 2.5=$ 780 Setup cost=5 orders∗$ 150=$ 750 Total cost for EOQ lot sizing=$ 780+$ 750=$ 1,530

11...