Environmental Engineering Reference
In-Depth Information
the.characteristics.of.those.patterns..SD.modeling.can.be.used.as.a.
laboratory.for.testing.policies.aimed.at.altering.a.system's.behavior.
in.desired.ways.shown.as.the.single.and.double.arrow.lines.in.the.
model..The.lines.indicate.event.and.time.lows.
In.SD.modeling,.there.are.special.expressions.for.these.characteristics..In.
the.Vensim.code,.the.technical.methods.are.indicated.by.single.and.double.
arrow.lines.as.follows:
.
1.. Single.arrow.line:.This.line.indicates.the.low.of.the.event..The.line.
represents. the. sequence. of. the. scenarios. as. well. as. the. dynamic.
behavior.. Therefore,. the. direction. of. line. gives. the. event. low. and.
event.feedback.
.
2.. Double.arrow.line:.The.dynamic.behavior.of.the.principle.of.accu-
mulation.is.considered.in.SD.modeling..Any.dynamic.behavior.can.
be. expressed. when. lows. accumulate. stocks,. as. seen. in. Figure  9.2..
The. feedback. loops. are. often. modeled. with. nonlinear. couplings,.
where.any.object.can.show.counterintuitive.behavior,.which.is.seen.
as.the.loop.in.Figure 9.2.
9.3 Calculation
The. academic. and. industrial. ields. are. connected. in. Figure  9.3,. and. NT.
applications. in. the. nuclear. industry. are. investigated.. Eventually,. one. can.
estimate.the.future.trend.of.the.governmental.budget..The.main.modeling.
for.atomic.nanotechnology.is.shown.in.Figure 9.4,.where.the.three.aspects.
of.technology,.manpower,.and.marketing.are.combined..These.three.aspects.
are.connected.by.academic.promotion.and.industrial.promotion.
Academic.promotion.involves.research.and.education.factors.(Figure 9.5)..
The.subfactors.include.skill,.license,.educational.material,.and.faculty.num-
bers.. Each. factor. is. quantiied. using. a. Monte. Carlo. simulation. of. random.
sampling.(Table 9.2).except.the.license.case..For.example,.when.the.random.
value.for.a.skill.is.below.0.2,.the.value.is.0.and,.in.the.other.case,.it.is.1..This.
is. deined. as. the. importance value ,. which. is. determined. at. the. discretion. of.
the. operator.. . The. importance. value. is. obtained. by. random. sampling. and.
given.a.value.of.0,.1,.or.2.in.Table 9.2..For.the.license.case,.the.modeling.is.
seen.in.Figure 9.6..The.event.lows.from.input.to.output.and.feedback.from.
output..In.the.new.technology,.the.value.is.cumulative.based.on.the.differ-
ence. between. input. and. output,. which. have. plus. or. minus. signs,. because.
the.license.is.a.legal.factor..This.is.expressed.in.the.event.low.diagram.as.a.
double.arrow.line.
 
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