تبلیغات
Case Method in Healthcare Operational Research Education - عدم تعادل عرضه و تقاضا
چهارشنبه 21 اردیبهشت 1390  10:43 ق.ظ
نوع مطلب: (جلسه9 ،) توسط: امین ترابی

عدم تعادل عرضه  و تقاضا

الف) فزونی عرضه به تقاضا عرضه < تقاضا

در این حالت كافیست یك مقصد مجازی به جدول حمل و نقل اضافه شود كه مقدار تقاضای آن معادل با  (250=550-800) می باشد.

هزینه حمل كالا به مجازی صفر است.

عرضه

مجازی

D

C

B

A

 

100

0

4

6

9

8

1

300

0

9

2

3

7

2

400

0

5

6

10

8

3

800

800

250

200

150

150

50

تقاضا

 

-       از بین 3 حالت صفر یكی را به دلخواه انتخاب می كنیم مثلا 2 پس 350 تا در انبار 2 باقی می ماند.

-       نكته: هر گاه عرضه بیش از تقاضا باش به جای هزینه صفر حمل و نقل در ستون مجازی می توانید هزینه های انبارداری هر واحد كالا را قرار دهید به این ترتیب مدل مجموع هزینه های حمل و نقل و انبارداری را حداقل خواهد كرد.

-       ب) فزونی تقاضا بر عرضه:

اگر تقاضا بیشتر از عرضه باشد هزینه عدم تأمین تقاضا (درخواست ضرر و زیان) داریم. به جای انبارداری

لذا در حل مساله باید یك سطر مجازی اضافه نمود و بعد مساله را حل كرد.


رستورانی به منظور ارائه خدمات در هرشبانه روز به تعدادی خدمتكار به صورت زیر بیان می دارد هر خدمتكار 8 ساعت متوالی در روز كار می كند هدف تعیین كمترین مقدار خدمتكار

دفعات روز

خدمتكار 8 ساعت متوالی

حداقل تعداد مورد نیاز

6-2

10-6

14-10

18-14

22-18

2-22

4

8

10

7

12

4

 

 

 

تعداد افرادی كه كار خود را در ساعت 2 آغاز می كند 2     : x1

6        : x2

10      : x3

14      : x4

18      : x5

22      : x6

 

محدودیت تعداد خدمتكار در ساعت6-2

محدودیت تعداد خدمتكار در ساعت10-60

 

حداقل تعداد خدمتكار : تابع هدف

 

                     

جواب با نرم افزار حل می شود.

نوع متغیرها عدد صحیح غیر صفر است لذا در نرم افزاری integer-non را بزنید.


  • آخرین ویرایش:پنجشنبه 19 خرداد 1390
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