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