EmbeddedSystemDesign《嵌入式系统设计》课后答案(英文版)(4)

北京航空航天出版社

Chapter1:Introduction

Amarketwindowisthetimeperiodinwhichagivenproductisindemand,specificallythetimeinwhichthisproductwouldyieldthehighestsales.Missingthewindowcouldmeansignificantlossinsales.

1.6UsingtherevenuemodelofFigure1.4(b),derivethepercentagerevenuelossequation

foranyriseangle,ratherthanjustfor45degrees(Hint:youshouldgetthesameequation).

tanA=opposite/adjacent

opposite=tanA*adjacent

Revenueloss=((ontime-delayed)/ontime)*

Areaofontime=1/2*base*height

=1/2*2W*tanA*W

=tanA*W2

Areaofdelay=1/2*base*height

=1/2*(W-D+W)*(tanA*(W-D))

=1/2*(2W-D)*(tanA*(W-D))W-DRevenueLoss=[((tanA*W2)-(1/2*(2W-D)*tanA*(W-D)))/

(tanA*W2)]*100%

=[(W2-(1/2*(2W-D)*(W-D)))/W2]*100%

=[(W2-1/2*(2W2-2WD-WD-D2))/W2]*100%

=[(W2-1/2*(2W2-3WD-D2))/W2]*100%

=[(2W2-2W2+3WD+D2)/2W2]*100%

=[(3WD+D2)/2W2]*100%

1.7UsingtherevenuemodelofFigure1.4(b),computethepercentagerevenuelossifD=5

andW=10.Ifthecompanywhoseproductenteredthemarketontimeearnedatotalrevenueof$25million,howmuchrevenuedidthecompanythatenteredthemarket5monthslatelose?

percentagerevenueloss=(D*(3W-D)/2W2)*100%

=(5*(3*10-5)/2*102)*100%

=(5*25/200)*100%

=62.5%

revenueloss=$25,000,000*0.625

=$15,625,000

2EmbeddedSystemDesign

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