TELKOM
NIKA Indonesia
n
Journal of
Electrical En
gineering
Vol.12, No.4, April 201
4, pp. 3100 ~ 3
1
0
4
DOI: http://dx.doi.org/10.11591/telkomni
ka.v12i4.4780
3100
Re
cei
v
ed Au
gust 27, 20
13
; Revi
sed
No
vem
ber 1
2
, 2013; Accepte
d
De
cem
ber
6, 2013
Using Flash Platform to Realize the Video Question
Answering System
Guie Jiao
Shan
gh
ai Jia
n
q
ia
o Univ
ersit
y
NO.1500, Ka
n
gqi
ao Ro
ad, P
udo
ng N
e
w
Area, Shan
gh
ai, Chin
a, 20
131
9
email: ji
ao
gui
e
@
12
6.com
A
b
st
r
a
ct
Video question answering
system
is designed
and developed bas
ed on Flas
h platfor
m
techno
lo
gy, be
lon
g
s of
B/S (
B
row
s
er/Serve
r) structure,
is
use
d
to
me
et the
ne
eds
of
spec
ific
grou
p
s
’
teachi
ng a
nd s
t
udyin
g. T
h
is p
aper d
e
scri
bes
core co
d
e
s of datab
ase
mo
d
u
le a
nd th
e rea
l
-time Q&A vid
e
o
mo
du
le a
b
o
u
t vide
o creati
ng
and v
i
de
o p
l
ay
back, als
o
des
cribes th
e rel
e
vant rea
l
i
z
a
t
i
o
n techn
o
lo
gy a
n
d
other functional m
o
dules of the system
. At
last, it gives some m
o
dified suggestions.
Ke
y
w
ords
:
fle
x
video Q&A F
M
S Actionscrip
t 3.0
Copy
right
©
2014 In
stitu
t
e o
f
Ad
van
ced
En
g
i
n
eerin
g and
Scien
ce. All
rig
h
t
s reser
ve
d
.
1. Introduc
tion
With the
ra
pi
d develo
p
me
nt of Intern
et, info
rm
atizati
on
con
s
tru
c
ti
on an
d
reform of the
major
coll
ege
s an
d unive
rsities
co
ntinu
e
to pu
sh
fo
rward
steadily
from
scratch
,
from wi
red
to
wirel
e
ss, fro
m
hardware
to software. In the
ca
se
o
f
my
sch
ool wirel
e
ss cam
pus network ha
s
been
put into
use, h
o
w to
make
full u
s
e
of cam
p
u
s
n
e
twork in
terms of "soft", in ord
e
r to i
m
prove
stude
nts'
lea
r
ning
efficien
cy and
quality
,
and
gradua
lly stren
g
then
networking,
informati
z
atio
n
teachi
ng
and
lea
r
ning
e
n
vironm
ent, thi
s
p
ape
r
pro
p
o
se
s th
e
onli
ne vide
o q
u
e
s
tion
an
sweri
ng
appli
c
ation
s
based
p2p
in
ca
mpu
s
net
work. In
RIA
popul
ar Internet e
r
a, b
e
ca
use
of it
s p
e
rfect
techn
o
logy
a
nd a
hig
h
m
a
rket
sha
r
e, t
he Fl
as
h pl
atform b
e
come
s the
mai
n
st
ream, p
r
omi
s
i
ng
developm
ent
platform
s. With the late
st RTMFP a
g
ree
m
ent (Real Time Me
dia Flo
w
Pro
t
ocol
abbreviation),
the latest ve
rsio
n of the F
M
S (Fla
sh M
edia Se
rver)
can
reali
z
e th
e se
rvice
such
a
s
un
ica
s
t and
b
r
oa
dc
as
t. O
t
h
e
r
, th
e
s
y
s
t
e
m
us
es
th
e co
mbinatio
n of "Tom
cat" +"J2EE" as
web
serv
e
r
.
2. Main Tech
nolog
y
2.1. Flash Platform Tech
nolog
y
The Fl
ash Pl
atform i
s
the
worl
d'
s lea
d
in
g de
sign
an
d
developm
ent
platform,
can
sup
port
a variety of
d
e
sktop
ope
ra
ting sy
stems
and exp
r
e
s
si
ve appli
c
atio
ns,
conte
n
t a
nd video. A
c
t
i
o
n
Script3.0
is
a Fla
s
h
scri
p
t
langu
age,
and
a
stand
ard
obje
c
t-ori
ented
pro
g
ra
mming l
ang
u
age.
Comp
ared
wi
th the previo
us ve
rsio
n, the Actio
n
Sc
ript3.0 increa
ses a l
o
t of fu
nction
s, main
ly
inclu
d
ing th
re
e aspect
s
:grammar, o
r
ien
t
ed obje
c
t an
d API. ActionScript3.0 i
s
a
n
script la
ngu
age
based ECMA
Script, is si
milar to Java, bu
t has its own uniqu
e advan
tages.
FMS (Fla
sh
Media Se
rve
r
ab
breviatio
n
) i
s
on
e of
the impo
rtant
com
pon
ents of this
platform, abl
e to deliver the live and o
n
-de
m
an
d
video an
d interactive appli
c
ations
safely and
reliably. Fro
m
the versio
n of FMS4, it suppo
rts th
e RTMFP protocol. RT
M
F
P, compa
r
e
d
to
RTMP (Re
a
l
Time Me
ssa
g
ing Protocol
abbreviati
on
), is b
a
sed o
n
UDP proto
c
ol, suitable
for
multica
s
t, and can imp
r
o
v
e the spee
d of the vi
deo delivery. Not through th
e serve
r
, it can
transfe
r data
directly bet
wee
n
the terminal user
s
of the Flash
player, but also redu
ce
the
band
width
co
nsum
ption.Wi
th the hel
p of
RTMFP
pr
ot
ocol, vide
o q
uestio
n
an
swering
sy
stem
in
camp
us net
work re
alizes t
he tra
n
smi
s
si
on fu
n
c
tion
based P2P
(Peer to Pe
er abb
reviation
s
,
point-to
-
poi
nt) technol
ogy, so
can
ma
ke full u
s
e
of existing
reso
urce
s. P2
P transfe
rs
data
betwe
en no
d
e
s withi
n
a n
e
twork, not d
epen
d on the
se
rve
r
, so n
ode
s in the n
e
twork is
better, it
also fits
well
with the ca
se of
student
s on
cam
p
u
s
. FMS4.5 en
han
ce
s the stability of vid
eo
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
Usi
ng Fla
s
h
Platform
to Realize the Vi
deo Que
s
tion
Answeri
ng System
(Guie Ji
ao)
3101
strea
m
ing
an
d redu
ce
s th
e loa
d
time,
also
it
can
h
e
lp u
s
e
r
s to
manag
e
co
ding a
n
d
bit
ra
te,
improve
s
the
final use
r
s ex
perie
nce in the asp
e
ct of o
n
line video.
Flex is an
other imp
o
rta
n
t comp
one
nt of t
he Flash
platform an
d the sol
u
tio
n
to the
pre
s
entatio
n layer and a cli
ent developm
ent env
ironm
ent for video que
stion an
sweri
ng sy
ste
m
.
By compiling
the MXML a
nd ActionS
cri
p
t into a sw
f file, Flex application
run
s
i
n
Flash Player
environ
ment,
and h
a
s a
rich interfa
c
e
pe
rforma
nce,
a
s
well a
s
th
e
perfe
ct inte
rface
optimi
z
at
ion
ability. Also its
client i
s
a
o
ne-time l
oad,
wit
hout th
e
need fo
r m
u
ltiple refre
s
h.
As an i
m
po
rtant
techn
o
logy o
f
RIA applications, Flex
covers
a serie
s
of technolo
g
y port
f
olio to sup
port
developm
ent
and d
eploym
ent of RIA.
T
he cli
ent'
s
de
sign
upg
rad
e
s fro
m
the p
a
ge-cent
ric to
the
comp
one
nt-centric, which
improve
s
the
desi
gn of clie
nt prog
ram
s
.
2.2. Web Ser
v
er
Flex develo
p
m
ent environ
ment
can u
s
e mo
st of th
e We
b p
r
og
ramming
platform to
acce
ss datab
ase, th
e sy
stem u
s
e
s
My
Eclipse
d
e
vel
opment
environment. MyE
c
lip
se Ente
rp
rise
Wo
rkb
e
n
c
h i
s
an
extension of Eclip
se IDE,
al
so is a p
o
werful integ
r
at
ed develo
p
m
ent
environ
ment for J2EE. We can g
r
eatl
y
improv
e work effici
en
cy in the database and J2
EE
developm
ent, publishing, a
nd an integ
r
at
ion of appli
c
a
t
ion serve
r
.
Tomcat is
n
o
t only adva
n
ce
d technol
ogy, st
able
p
e
rform
a
n
c
e,
and i
s
free,
thus
got
many Java l
o
vers a
nd h
a
s be
en re
cogni
zed by
some soft
ware develop
ers, become
cu
rre
nt
popul
ar Web
applicatio
n server.In the run-time, it
occupy sm
all system re
sou
r
ce
s and is g
ood
scalability,
al
so support comm
onl
y used functions to develop
application, such as l
oad
balan
cing, m
a
il servi
c
e.
3. Function
Module
The vide
o
system o
r
igin
ated in
the
co
urse, i
s
a n
e
two
r
k sp
ace to
multimedia
comm
uni
cati
on and
re
so
urce shari
ng
betwe
en tea
c
hers
an
d stu
dents, that is to say, it is an
importa
nt su
ppleme
n
t part to class te
achi
ng. In
order to refle
c
t
the focus o
n
the teachi
ng
pro
c
e
ss, the
system p
r
ovi
des
st
at
ist
i
cal
f
unct
i
on
s,
su
ch a
s
the n
u
m
ber of q
u
e
s
tion answe
rin
g
,
the numb
e
r
o
f
particip
a
ting
in the di
scussion, t
he
num
ber of
downlo
ad data, et
c, whi
c
h result is
a part of stud
ents' exami
n
a
t
ion results.
As sh
own in Figure 1,
syste
m
diagram.
Figure 1. System Diag
ram
The sy
stem inclu
d
e
s
the followin
g
mod
u
les.
3.1. User Ma
nagemen
t
M
odule
The sy
stem
has th
ree
user role
s: tea
c
he
rs,
stude
nts an
d visit
o
rs, e
a
ch ha
ving a
different o
p
e
r
ating
privile
ge. Tea
c
h
e
rs are
pa
rt
-tim
e admi
n
istrat
or. Before
course, tea
c
h
e
rs
sho
u
ld
com
p
l
e
te re
gistration to a
dd
o
w
n info
rm
atio
n a
s
well a
s
stud
ents
of
the cla
s
s. When
enterin
g, tea
c
he
rs ne
ed b
y
use
r
nam
e,
password
a
n
d
curricul
um,
stud
ents
ne
ed by thei
r n
a
me
and th
e d
e
fa
ult pa
sswo
rd,
but the
cou
r
se i
s
option
a
l
.
If not selecti
ng
cou
r
se, th
ey just
ente
r
all
FMS(sendi
ng
and
receiving au
d
i
o and video
data stream
）
Tomcat
（
acceptting the
requ
est of the
client,
reali
z
ing the
databa
se
con
n
e
c
tion,et
c
）
A
cce
s
s
（
saving user
information
）、
XML
RTMP
HTTP
Internet
Brows
e
r
:IE,Firef
ox,etc
.
（
Need to
install
Flash
Player
）
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 4, April 2014: 3100 – 3
1
04
3102
the co
urse
s. After enterin
g
the
system, stude
nts can add
o
w
n
info
rmation, incl
u
d
ing
cha
nge t
he
password. Student a
c
coun
ts are d
e
leted
automatically
when tea
c
h
e
r
s d
e
lete curriculum. Visito
rs
do not nee
d to log.
3.2. Data M
a
nagemen
t
M
odule
In the syste
m
, teache
rs
can
provid
e i
n
form
atio
n fo
r stu
dents to
downloa
d. Note that,
uploa
ded
dat
a by tea
c
he
rs is withi
n
th
e co
nfine
s
of
the curriculu
m
, stude
n
ts
can
se
e diffe
rent
informatio
n
whe
n
ente
r
in
g into differe
nt cou
r
se
s.
Students
mu
st login
on t
o
do
wnlo
ad
data,
while a visito
r can only see
the data.
3.3. Online Question
Ans
w
e
r
ing Mod
u
le
After enterin
g the syste
m
, Student can
se
e current onlin
e teachers an
d
student
s
(thro
ugh FMS
Shared
Obje
ct to achieve). Students
may
reque
s
t vide
o que
stion an
swerin
g to the
te
a
c
he
r
,
a
l
s
o
c
a
n
c
h
oo
se
o
n
lin
e s
t
ud
e
n
ts
fo
r vid
e
o
co
mmu
n
i
c
a
tion
. T
e
ac
he
rs
re
c
e
ive s
t
ud
en
t'
s
invitation, just the other
stu
dents
we
re q
uestio
n
an
swering,
can a
s
k wh
ethe
r this stud
ents
would
like to join the
video discu
s
sion g
r
ou
p to discu
ss.
As
shown in Figu
re 2, Q & A flo
w
ch
art.
Figure 2. Onli
ne Que
s
tion
Answeri
ng Fl
ow Chart
3.4. Not Onli
ne Ques
tion
Ans
w
e
r
ing
Module
If the teache
r i
s
n
o
t onli
ne, stu
dent
s ca
n
cho
o
se
the lin
e a
n
s
werin
g
th
ro
ugh text
messag
es
(pi
c
ture
), re
co
rd
video, etc. Of co
u
r
se, st
udent
s ca
n d
e
lete own m
e
ssag
e. Tea
c
her
login and vie
w
messa
g
e
s
, then reply messag
e on
e by one. Visitors ca
n view an
d reply
to
messag
es, al
so obtai
n lea
r
ning m
a
teri
a
l
s by r
eplyin
g
to the message, su
ch
as email add
re
ss,
MSN user na
me, QQ num
ber, etc.
4. The Realization of Par
t
ial Modules
4.1. Data
bas
e
Design
Becau
s
e of u
s
er info
rmati
on, data informat
ion, message boa
r
d an
d so on, the system
involves la
rg
e amo
unt of
data, so u
s
e
s
Micro
s
oft's A
c
cess
databa
se m
ana
gem
ent sy
stem. A
s
a
web front-e
n
d
desi
gn plat
form, Flex ca
n’t access
th
e databa
se
dire
ctly, so a
c
hieve the d
a
ta
comm
uni
cati
on
by HttpService and We
bService
co
m
pone
nts fo
rm
ActionScript
3.0. The
key
of
databa
se d
e
sign is the n
a
m
e of cou
r
se
, which i
s
ne
eded
whe
n
st
udent
s login,
teach
e
rs uplo
ad
data, stud
ent
s do
wnl
oad i
n
formatio
n, e
t
c. The m
a
in
tables th
at the syste
m
hav
e create
d
are
as
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
Usi
ng Fla
s
h
Platform
to Realize the Vi
deo Que
s
tion
Answeri
ng System
(Guie Ji
ao)
3103
follow: stud
e
n
ts an
d visitor inform
ation, teac
her information,
cou
r
se inf
o
rmatio
n, da
ta
informatio
n, online informat
ion, not onlin
e informatio
n, etc.
4.1.1. Using HttpServ
ice
method
<mx:HTTPSe
rvice id
="cl
assName" meth
od="
G
ET" re
sult="on
Re
sult
(event) "/>
outputField.text=event.rusult as String
;//
onResultis the body
of the function
4.1.2. using RemoteObje
ct meth
od
<mx:Rem
o
teObject id="remo
te
O
b
j" des
tin
a
t
io
n=
"sr
o
">
<mx:method name
=
"e
cho
M
essag
e
"
re
sult="displayM
essag
e
(eve
nt)"/>
</mx:Remote
O
bje
c
t>
<mx:Button label
="cli
ck to
have info
rma
t
ion"
cli
c
k="e
choM
essa
ge
()"/>//define th
e button
to trigger the ‘
Remote
Obje
ct’ remote ev
ent
Pu
b
lic
fu
nc
tion
e
c
ho
Mes
s
ag
e
(
)
:
vo
id
{
remoteObj.echoMes
sage(input.te
xt) }//define the function
4.2. Realiza
t
ion of Online
Module
In ActionS
cri
p
t3.0, users
can
re
ad
or storage
data
i
n
the l
o
cal o
r
se
rver by th
e shared
obje
c
t “Sha
redObj
ect”. T
he cla
s
s Sh
ared
Obje
ct
can re
alize re
al-time data
sha
r
ing
amo
ng
multiple clie
nt files and obj
ect,as
Coo
k
ie
in IE br
owser. In general,Use of “Sha
red
O
bje
c
t” obje
c
ts
inclu
d
e
s
the
maintena
nce
of local p
e
rsi
s
ten
c
e,
st
ori
n
g data
on
the
se
rver an
d
realizi
ng th
e d
a
ta
sha
r
ing.
Whe
n
usin
g getL
o
cal
() o
r
get
Remote
() to
cre
a
te a lo
cal or remote
Share
d
Obj
e
ct
, it
can u
s
e a o
p
tional pa
ra
meters “se
c
u
r
e”. If this
pa
ramete
r is
se
t to true and
the SWF file is
transmitted through the
HTTPS, Flash Player
will create a
secure shared
object to get
a
refer
e
n
c
e.
You mu
st first conn
ect to t
he FMS
se
rver in
ord
e
r to
tran
sfer th
e l
o
cal
audi
o an
d video
to the other cl
ient. The way of conne
ctio
n is th
roug
h the con
n
e
c
t () method whi
c
h belong
s to the
NetConnec
t objec
t.
NetStream o
pene
s co
nne
ction flow bet
wee
n
t
he clie
nt and the se
rver. The “Ne
t
Stream”
obje
c
t is a ch
annel in the
NetConn
ectio
n
obje
c
t.
4.2.1. Establish Link
var multi_tea
c
he
r-nc:
N
etConne
ct
ion
= n
e
w Nect
Con
n
e
ction
();
multi_teacher-nc
.
c
onne
c
t
("
rtmfp://loc
alhos
t:2032/genc
h
video");
multi_teache
r-nc.a
ddEvent
Listen
er(NetStatusEvent.NET_STATUS,
multi_teache
rHan
dler);
4.2. 2.Establish Group
// After a successful co
nne
ction, need to establi
s
h g
r
o
u
p
this.m_
s
pe
c = ne
w Group
Specifie
r("my
Grou
p");
m_sp
ec.
s
e
r
verChan
nelEn
abled =
true;
m_sp
ec.o
bje
c
tRe
p
lication
E
nabled =
tru
e
;
lbl1.text =
"farID : " +
nc
.farID +
"\nNearI
D
: " +
nc
.nearID;
m_ng = n
e
w
NetG
roup
(n
c,
m_spe
c
.g
rou
p
sp
ecWithAu
thorization
s
());
4.2.3. Publish Video
var cam
e
ra:
C
amera = Cam
e
ra.get
Cam
e
ra();
came
ra.
s
etM
ode(320,2
40,
24,true
);
came
ra.
s
etQ
uality(0,80
);
video.attach
Camera(cam
era);
multi_teache
rns = n
e
w
NetStream
(m
ulti_teacher,
N
etStream.
D
I
R
ECT
_
CONNECTIO
N
S);
multi_teache
rns.attachCa
mera
(came
r
a
)
;
multi_teache
rns.cli
ent = thi
s
;
multi_teache
rns.pu
blish("
c
am1","live");
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
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Vol. 12, No. 4, April 2014: 3100 – 3
104
3104
4.2.4. Pla
y
Video
multi_teache
rns = ne
w Ne
tStream(m
ulti_teacher
-n
c,"id of the
vide
o st
ream
a
c
cepting
from the publi
s
hin
g
sid
e
");
video.attach
NetStream(mul
ti_teach
e
rn
s);
multi_teache
rns.play("
cam
1
");
5. Conclusio
n
The
system
has
obtain
e
d
the very g
o
od tea
c
hin
g
effect and
re
ceived
praise from
teach
e
rs a
nd
stude
nts. At the same tim
e
, syst
em pro
m
otion
of
th
e profe
ssi
onal
and school
is
on
the ag
end
a. In fact,
whi
c
h
is ju
st
what t
he
syst
em
n
eed
s to im
prove, su
ch
a
s
the p
r
obl
em
s of
use
r
m
anag
e
m
ent, the n
e
ed to in
crea
se th
e ad
minis
t
rator, the teac
hers providing
q
u
e
s
tion
answe
ring
who
have
not the cou
r
se, th
e u
s
e of re
so
urce
s is
not
limited to
one
cou
r
se.Mea
n
w
hile, this
system used th
e FMS dev
eloper ve
rsi
on
whi
c
h conten
t is complete
ly
free, but b
a
n
d
width i
s
limi
t
ed and
ma
kes the
bo
ttle
neck a
bout
a
n
sweri
ng n
u
mber
at the
same
time.
Combi
ned
with own u
s
e, this pape
r intro
duces the fun
c
tion and the
realization of video
que
stion an
sweri
ng sy
ste
m
based on
P2P in cam
pus n
e
two
r
k,
hope mo
re
discu
ssi
on wi
th
read
ers, in o
r
de
r to impro
v
e and pe
rfe
c
t the
syste
m
, enhan
ce t
he experi
e
n
c
e of use
r
s, a
s
a
useful
sup
p
le
ment to cla
s
sroom tea
c
hi
n
g
.
Referen
ces
[1]
W
u
Yuanzh
e
n
g
. Net
w
o
r
k Vi
deo Questi
on
Ans
w
e
r
i
ng S
y
stem Des
i
g
n
Based F
M
S.
Journal of
Muda
nji
a
n
g
Un
iversity
. 201
1; 20(8) : 116-
11
9.
[2]
Z
hou Ji
an, Li
u
W
e
ifa, Yu Ro
ngro
ng. Des
i
g
n
an
d Implem
entatio
n of Gradu
at
es Surve
y
Ap
plic
atio
n
S
y
stem Bas
ed
on F
l
e
x
an
d J2
EE.
Computer
Know
led
ge a
n
d
T
e
chno
lo
gy
. 201
0; 6(33): 93
10-9
311.
[3]
Den
g
Meng
de.
Research o
n
F
l
ex’s Appl
icat
i
on in the D
e
v
e
lo
pment of
Di
stance T
eachi
ng S
y
stem.
Moder
n Educ
ation T
e
ch
nol
ogy
. 2009; 19: 92-
94.
[4]
Z
hou
Le
qin
g
.
T
he Desig
n
A
nd Imp
l
eme
n
ta
tion
of T
r
ansp
o
rtation
Bid
R
a
n
kin
g
S
y
stem
Based
o
n
F
l
e
x
T
e
chnolog
y.
Mi
croco
m
p
u
ter Applic
atio
ns
. 20
09; 30(5): 2
4
-2
8.
[5]
Lin
Ke, Y
ang
Min, Ma
o D
ili
n. Schem
e for
P
e
rfo
rmanc
e Im
provem
ent of
P2P L
i
ve
Vid
e
o Stream
ing
o
n
LANs.
Journ
a
l
of Chin
ese Co
mp
uter Syste
m
s
. 2011; 32(
7) : 1281-
12
86.
[6]
Qian Yu, C
hen
Z
h
i
y
un. Ap
plic
ation
of RIA T
e
chn
o
lo
g
y
Bas
ed o
n
F
l
e
x
i
n
Educati
on S
o
ftw
a
r
e Are
a
s
.
Co
mp
uter & Di
gital En
gin
eer
i
n
g
. 200
9; 37(5)
: 160-163.
[7]
Guie Ji
ao. T
h
e
P2P a
p
p
licati
on
base
d
F
l
as
h pl
atform tech
nol
og
y
in c
a
m
pus
net
w
o
rk.
Mi
cro
c
om
pu
te
r
app
licati
ons
. 2
012; 28(
7): 48-
50.
[8]
W
ang F
e
ng.
Rese
arch
an
d
App
licati
o
n
o
f
Rich
Intern
et App
licati
o
n
T
e
chn
o
lo
g
y
B
a
sed
on
F
l
e
x
.
Shan
gh
ai Jia
o
T
ong Universit
y
. 20
08.
[9]
Lei L
e
i. Des
i
g
n
and Impl
eme
n
t
ation of Re
al-t
ime
Net
w
o
r
k T
each
i
ng P
l
atfor
m
Based W
eb.
South
w
e
s
t
Jiao T
ong Univ
ersit
y
. 2
010.
Evaluation Warning : The document was created with Spire.PDF for Python.