Fourteenth
Industrial Mathematical and Statistical Modeling
Workshop for Graduate Students
July 21-29, 2008
North Carolina State University
Raleigh, NC
Faculty and postdoctoral mentors
H. T. Banks
1
, Ariel Cintron-Arias
1
, Mansoor Haider
2
, Ilse Ipsen
2
, Grace Kepler
1
,
Mette Olufsen
2
, Tao Pang
2
, Jeff Scroggs
2
, Nell Sedransk
3
, Gentry White
4
, Jasmine
Zhou
3
1. CRSC/CQSB, North Carolina State University, Raleigh, NC 27695-8205
2. Dept of Mathematics, North Carolina State University, Raleigh, NC 27695-8205
3. National Institute of Statistical Sciences, 19 TW Alexander Drive, Durham, NC 27709
4. Dept of Statistics, North Carolina State University, Raleigh, NC 27695-8203
Participants
Sydney
Akapame
Montana State University
Daniel
Beavers
Baylor University
Abhishek
Bhattacharya University of Arizona
Jacob
Blanton
Louisiana State University
Daniel
Cargill
NJ Inst. Of Tech
Matthew
Causley
NJ Inst. Of Tech
Juanjuan
Chai
Indiana University
Nancy
Chalmers
University of South Carolina
Wei
Chen
John Hopkins University
Jintao
Cui
Louisiana State University
Caitlin
Daley
NCSU
Giulio
Genovese
Dartmouth College
Nicholas
Gewecke
University of Tennessee
Marian
Hofer
University of California
Kathleen
Holm
NCSU
Jobby
Jacob
Clemson University
Adarsh
Joshi
Texas A&M University
Yogesh
Joshi
NJ Inst. Of Tech
Manmeet
Kaur
NJ Inst. Of Tech
Viviane
Klein
Oregon State University
Denka
Markova
Baylor University
Linda
Njoh
Baylor University
Lu Ee
Peh
University of Dayton
Peng
Qi
University of Wisconson-Madison
Yu
Qiu
Iowa State University
Lucinda
Robledo
University of California
Shashi
Singh
University of Hawaii
Svetlana
Solovieva
Moscow State University
Jeff
Stanley
Texas A&M University
Shuguang Tan
University of Florida
Solmaz
Torabi
University of California, Irvine
Mark
Walters
University of South Carolina
Nathan
Wanner
NCSU
Justin
Wright
Bloomsburg Univ
Bokai
Yan
University of Wisconson-Madison
Preface
This volume contains the proceedings of the
Industrial Mathematical and Statistical
Modeling Workshop
for graduate students, held at the Center for Research in
Scientific Computation at North Carolina State University (NCSU) in Raleigh, North
Carolina from July 21-29, 2008. This was the fourteenth such workshop to be held at
NCSU, and brought together 36 graduate students from 24 universities.
On the morning of the first day, industrial scientists presented five research problems.
Students were divided into five teams to work on mathematical and statistical modeling
problems presented. In contrast to neat, well-posed academic exercises that are
typically found in coursework or textbooks, the workshop problems are challenging
real-world problems that required the varied expertise and fresh insights of the group for
their formulation, solution and interpretation. Each group spent the first eight days of the
workshop investigating their project and reported their findings in half-hour public
seminars on the final day of the workshop.
This year’s projects were
Cardiovascular events associated with oral and IV-administered antibacterial
agents
Glaxo SmithKline
Presenter: Jeffrey D. Wetherington
Faculty Mentors: Grace M Kepler, HT Banks, and Ariel Cintron-Arias
Estimating position and velocity of flight vehicles using angle-only
measurements
MIT Lincoln Laboratory
Presenter: John Peach
Faculty Mentors: Mansoor Haider, Gentry White
Quantifying normal variation in ECGs
National Institute of Statistical Sciences
Presenter: Nell Sedransk
Faculty Mentors: Mette Olufsen, Nell Sedransk, and Jasmine Zhou
Behavior of dynamic aggregate loss distributions emerging from mortgage
insurance risk
Republic Mortgage Insurance Company
Presenter: Frank Meyer
Faculty Mentors: Tao Pang, Jeff Scroggs
Permuting large entries of a sparse square matrix to its diagonal
SAS Institute
These problems represent a broad spectrum of mathematical and statistical topics and
applications. While the problems included many aspects that are challenging to address
in the nine-day duration of the workshop, readers of this report will observe remarkable
progress on all the projects.
We strongly believe that this type of modeling workshop provides a highly valuable
research related experience for graduate students that simultaneously contributes to the
research of the industrial participants. One of the biggest challenges in real-world
research is defining the problem and identifying what can be done about it. Our
workshop participants get experience in this crucial life skill. In addition, the workshop
improves graduate students’ ability to communicate and interact with scientists who are
not traditional mathematicians, but who require and employ mathematical tools in their
work. Through this unique experience that exposes students to the means by which
mathematics is applied outside academia, the workshop has helped many students
clarify their career aspirations. In several cases, after past workshops, students have
been hired by the participating companies. Students interested in academic careers
also find a renewed sense of excitement about applied mathematics and statistics from
broadening their horizon beyond that which is typically presented in mathematics
graduate education.
Active participation of all involved during a nine day period of almost uninterrupted work,
plus a series of social activities, enhanced the success of the workshop. The organizers
are grateful to the participants for their dedicated effort and contributions.
Funding for the workshop was provided by the Statistical and Applied Mathematical
Sciences Institute (SAMSI) with additional financial support, personnel, and facilities
provided by the Center for Research in Scientific Computation (CRSC) and the
Department of Mathematics at North Carolina State University.
Finally, we would like to express our sincere gratitude to Deborah Leistikow, Lesa
Denning and Mara Gonzalez for their efforts and help in all administrative matters. We
are also grateful to Hien Tran for conducting the CRSC lab demonstration.
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0
0.5
1
1.5
2
2.5
3
0
5
10
15
20
25
30
CP − Pulmonary Artery
0
0.5
1
1.5
2
2.5
3
0
2
4
6
8
10
CL − Lung
0
0.5
1
1.5
2
2.5
3
0
5
10
15
20
CA − Aortic Arch
0
0.5
1
1.5
2
2.5
3
0
1
2
3
4
5
CH − Heart
Concentration (mg/L)
Time (min)
T=30 seconds
T=60 seconds
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0
0.5
1
1.5
2
−30
−20
−10
0
10
20
30
time (min)
Sensitivity function
Sensitivity of C
P
(t) to Parameters
Q
T
V
M
D
T
0
1
2
3
−20
−15
−10
−5
0
5
10
time (min)
Sensitivity function
Sensitivity of C
A’
(t) to Parameters
Q
T
V
L
T
0
1
2
3
−5
0
5
10
15
time (min)
Sensitivity function
Sensitivity of C
L
(t) to Parameters
Q
T
V
L
E
L
V
0
K
M
T
0
2
4
6
−5
0
5
10
15
20
time (min)
Sensitivity function
Sensitivity of C
H
(t) to Parameters
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0
2
4
6
8
10
−50
0
50
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
P
(t) to Parameters
Q
T
V
M
D
T
0
2
4
6
8
10
−40
−30
−20
−10
0
10
20
30
40
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
A’
(t) to Parameters
Q
T
V
L
T
0
1
2
3
4
−100
−50
0
50
100
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
L
(t) to Parameters
Q
T
V
L
E
L
V
0
K
M
T
0
2
4
6
8
10
−2
−1
0
1
2
3
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
H
(t) to Parameters
E
L
Q
H
V
H
k
T
WYO;=?GI4 ,R4`5EKIWAD48PV4CFPVWAKLWYqWKHou=?CFXKLWY1;CFPu1DGUE5Y5§FEG[E@B4`KL4`G[P._Z?4PV49PV4CFPVWAKLWYqWKIWA4PnE;GLWPL4RuGL1D@c1;=?GPVH/PVKL4@1;'4f%=FEKLWY1;CFP 3/4PIXGIWY?WACFO8KLZ?49?WY1;5Y1;ODWYXE5)PLH/PKI4`@.S K X`4`GLKIEWYCKIWA@B49)1DWAC%KIP WAK7WP9@B1;GI4¨WY@1;GLKIE;C%KKI1oK[E0;4¨KLZ?4@B4EDPV=?GI4`@B4CDK7WA KLZ?4X`1;CFX`4`C%KLG[EKIWA1DCPV1D5A=/KIWA1DCFP7EGI4¨@B1;GI4zPL4`C)PVWAKLWY;4BEK9KLZ?41;WYCDK.+ 1DPIPVWY?5Y49KIZ?WP>PLZ?1;=?53)4UKIE0D4`CBWYCDKI1 X1DCFPVW3/4GIEKLWY1;Czu1;G 4*q4`GIWY@4C%KIE5)3/4PLWAODCKL18Z?45AWY@B?GL1D4 KLZ?4U@B1/3/45*.?1DG4?E@B?5Y49 WA§KLZ?4bX`1;CFX`4`C%KLG[EKIWA1DCBWACKIZ?4bX`1;GI1;CFE;GLH¨PLWYC%=)P uZF4EGLK6 'SDWP>KLZ?4U@E;WACJ1DH4XKLWY;45KLZF4`CJ4*q4`GIWY@4C%KIPKIZFEK X1;=F5Y3PL=?O;OD4PVK @B1;GI4EDX`X=FGIEKL4bE;5A=?4P 1'KIZ?4)EG[E@B4KI4`G[P # E;CF3 6n1D=?5Y3o)49C?4X4PIPIEGIHzu1DGn@B1DGL49WAC?u1;GI@BEKLWY;4GL4PV=?5AKIP/PVWYCFX`4 '6WYP KLZF48@1%PKUPL4`CFPLWAKLWY;49KL1BKIZ?1DPL47FEG[E@B4KI4`G[P`.
! " # $&%' (%)
; 4 E5PV14?E@BWYC?43PL4`CFPLWAKLWY%WAKLWY4P u1DGUEC1;?KLWY@WYEKLWY1;C?GI1;?5Y4`@ 3?4:FC?43E;P
@E +* :+ @E * X *
*
X +
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0 +
' *))[
)1* u:).]
&Z(RE;PIPL=?@BWAC?OKIZ?4 KIWA@B4n)1DWAC%KIPEGI4)@ *) * *)._Z?4 @E/WY@¨=?@ 1;%KIZ?WPX`1DPVK'u=?CFXKLWY1;C RWY5A5%@E/WY@WY`4>KLZ?4 X1DCFX4CDKIGIEKLWY1;C 1KIZ?4¨3/GI=?O4qKIGIEDX KL43WAC%KL1BKIZ?4 5Y=?C?OCFRZ?WY5A4¨@WYC?WY@BWAWAC?OJKLZ?4¨X`1;CFX`4`C%KLG[EKIWA1DC1;KLZ?4 F5A1q1/3WACKIZ?4¨X1DGL1DCFEGIHJPLWACq=FP. _ZF4 GI4PL=?5K71nKLZ?WP91;/KIWA@BWYEKLWY1;C RWA5Y5)4EPV4`K71;>FE;GIE;@4`KL4GIPWACFX`5A=)3/WACFOoKIZ?4BFEG[E@B4KI4`G[PUKIZFEK PL)4XWAuH E3/1DPLWACFOPVKLG[EKL4O;H5 KLZ)EK8E;X`X`1;@B?5YWYPLZKLZFWYP.4Eb1n4;4G)1;/KIWA@BWYEKIWA1DC PIX[Z?4`@B4PC?4432WYC?WAKLWE5FEG[E@B4`KL4`G4PVKLWY@EKL4P`.9_Z?4zPL4`C)PVWAKLWYqWKH2EC)E5YHqPLWP WYC/u1;GI@Pn=)PRE;PnKL1BRZ?WX[ZWYC?WAKLWE5§FE;GIE;@B4KL4Gn4PKIWA@EKL4PnKIZ?471;/KIWA@BWYEKIWA1DCGI4PL=?5AKIPEGI49@1%PKRPL4`CFPLWKIWAD49KL1F.APVWYC?OB4f%=FEKLWY1;C :F.^# 4¨ 4`GI4zE;?5A4¨KL1X`E;5YX`=?5YEKL4¨KLZ?4GL45YEKLWY;4PV4CFPVWAKLWYqWKIWA4P91KLZF4X`1DPVKu=?C)X KLWY1;C
*
RKI1oKIZ?4FEG[E@B4KI4`G[P`.7_Z?4GL4PV=F5K[P EGI48?GI4PL4`C%KL43o4`5Y1 WAC2_E?5Y4¨^F.n_Z?48E5Y=?4PUWYCKIZ?48K[E?5Y4¨EGI47GIE;C#;43uGL1D@ @B1DPVKUC?4`O%EKIWAD4`5YHoPV4CFPLWKIWAD4uE5Y=?4 1;X`1DPVK u=?CFXKLWY1;C @B1;GI4PL4`CFPLWAKLWY;4zKL123/4X`GL4E;PLWACFO UKL1@1%PK81DPLWKIWAD4;.?GI1;@ KLZFWYP7 4X`EC PV44¨KIZFEK7KIZ?WYP71D/KLWY@BWAEKIWA1DC PIX[Z?4`@B4WYP @B1DPVKUPV4CFPVWAKLWY;49KI1?+ ( A FEC)3 D@ .
0
0.5
1
1.5
2
−20
−15
−10
−5
0
5
time (min)
Sensitivity function
Sensitivity of C
P
(t) to Parameters
D
T
0
1
2
3
4
5
−15
−10
−5
0
5
time (min)
Sensitivity function
Sensitivity of C
A’
(t) to Parameters
D
T
0
2
4
6
8
10
−8
−6
−4
−2
0
2
time (min)
Sensitivity function
Sensitivity of C
L
(t) to Parameters
D
T
0
2
4
6
−3
−2.5
−2
−1.5
−1
−0.5
0
0.5
1
time (min)
Sensitivity function
Sensitivity of C
H
(t) to Parameters
D
T
WYO;=?GI48]#, q4`C)PVWAKLWYqWKHou=?CFX KIWA1DCFPu1DGRFEG[E@B4KI4`G[P E;CF3+/1;C?5YH;.
_1WY5Y5A=FPVKLG[EKI4BKLZ?4o=FPV4`u=?5YC?4PIP81 KLZFWYPzPV4CFPVWAKLWYqWKH ECFE;5AH/PLWYP' 4JX1DCF3/=FXKL43KIZ?4J1;?KLWY@WYEKLWY1;C'._Z?4J1;?KLWY@BEKLWYEKLWY1;C E5YO;1DGLWAKLZF@ @WYC?WY@BWA4P KLZF47X`1DPVKnu=FCFX KIWA1DC
_E;?5Y47^,R4`5EKIWAD48PV4CFPVWAKLWYqWKIWA4P1FEG[E@B4`KL4`G[PnKL1X1%PKu=?C)X KLWY1;C * + ( .
R4`5EKIWAD4 q4`CFPLWAKLWY%WAKH - E;5A=?4
( ( /ýD.]D^:;: ( ( /ýD.^%-Dd: ( ( \!F. ^5!%d-0 ( ( 0 \!F.Óý];^9M ( ( \!F. ( ( \!F.!5!:5! ( ( !F.!5!%d0M 3 5 ( ( 35 !F.Óý]9!5! % ( ( % !F.Óý];^5M 3 ( ( 3 !F.^5ZD: ( (
0
2
4
6
8
10
−1.5
−1
−0.5
0
0.5
1
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
P
(t) to Parameters
D
T
0
2
4
6
8
10
−1.5
−1
−0.5
0
0.5
1
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
A
(t) to Parameters
D
T
0
2
4
6
8
10
−40
−20
0
20
40
60
80
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
L
(t) to Parameters
D
T
0
2
4
6
8
10
−15
−10
−5
0
5
time (min)
Rel. Sensitivity function
Relative Sensitivity of C
H
(t) to Parameters
D
T
WAOD=?GI4 d,R4`5EKIWAD48PV4CFPVWAKLWYqWKHJu=?CFX KIWA1DCFPu1DGRFEG[E@B4KI4`G[PE;CF3+/1;C?5YH;.
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*
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U4`5EKLWY;4 q4CFPLWKIWAqWAKH - E;5A=?4
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_Z?4GL45YEKLWY;4oPL4`CFPLWAKLWY%WAKH u=?CFXKLWY1;CFPzWAC WAO).¦d2E;GL4o@1DGL4WAC?u1;GI@BEKLWY;4u1DG8' ( ))[
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WP>PL1;@B4`RZ)EK GI4`5EKLWY;45AH PL4`CFPLWKIWAD4KL1¨u1DG) ; -#;?=/K WYP>@B1DPVKL5YH¨GI4`5EKLWY;45AHPV4CFPLWKIWAD4KL1 . n1;C)X4`C%KIGIEKLWY1;C ' ))[
WP @B1DGL4RGI4`5EKIWAD4`5YHzPL4`CFPLWKIWAD4 KL1{E;CF3o E;PnKLWY@B4 ) WYCFX`GL4E;PL4P.e/E;@BWAC?WYC?OWYOF.>d¨X5Y1DPL4`5YH9%WKUXECo47PV44`CJKIZFEKRPL4`CFPLWKIWAqWAKHBKL1B\WP C?1;C`4GL1CDF=/KE;5A5 KLZF4 X1;C)X4`C%KIGIEKLWY1;CFPEGI49@1DGL47GI4`5EKIWAD4`5YHoPV4CFPLWKIWAD4KI1B{KIZFECKLZ?4HE;GL49KL12.
! " # '
SbPb)4`u1;GI49n4zE5PV1JXE5Y=FX`EKL43KIZ?4¨GI4`5EKIWAD4 PV4CFPLWKIWAqWAKHou1DGUKLZF4¨X1%PKUu=FCFX KIWA1DC
*
uGI1;@4f%=FEKLWY1;C u:).:L u1;G9 ECF3U Z?1D5Y3/WYC?OJE;5A51KLZF4`GUFE;GIE;@B4KL4GIP :q43§.R_Z?4 GI4PL=?5AKIPR1;KIZ?WPbPL4`CFPLWKIWAqWAKHE;CFE5YH/PVWPRX`E;C2)4 u1;=?CF3WYC_E?5Y4z/._Z?4 GI4`5EKIWAD4 PL4`CFPLWKIWAqWAKHJE5Y=?471
*
>KL1{WP@¨=)X[ZODGL4EKL4GWAC@EO;CFWKI=F3/47KLZ)ECKL12. _Z?WPUX1DGLGI4PL1;CF3?P>KL1KIZ?48GL4PV=F5K[Pn49u1;=FCF3 WYCKIZ?4 EC)E5YHqPLWPn1;X`1;CFX`4`C%KLG[EKIWA1DCPL4`CFPLWAKLWY%WAKLWY4P u1DGKLZ?47K 1BFEG[E@B4`KL4`G[P.
Sb3F3/WKIWA1DCFE5Y5YH9%n4WA@B?5Y4`@B4`C%KI43BKIZ?4b1D/KLWY@BWAEKLWY1;CoRWKIZKLZ?49X1%PKnu=?CFX KIWA1DCuGI1;@c4f%=FEKLWY1;Cu:).Md9 ._Z?4GL4PV=?5AKIP>1§KIZ?WYP 1;?KLWY@WYEKLWY1;C¦X`E;C4Bu1;=?C)3 WYC_E;?5A4]F._Z?4J3?W<4`GI4`CFX`4BWAC @EO;WYC?WAKL=F3?4)4`Kn44`CKLZ?4WYC?WAKIE54PKIWA@EKL4u1;G8cECF3 KLZF4 1;?KLWY@WY`43E;5A=F49WPRODGL4EKL4G KLZFE;CoKIZFEKU1;2. _ZFWYPGI4PL=?5AKUZ?4`5YFP KL1E;5AW3?EKI49KLZ?4>:FC)3/WACFODPR1;1;=FGUPV4CFPVWAKLWYqWKHECFE;5AH/PLWYP.
0
2
4
6
8
10
0
0.5
1
1.5
2
2.5
Heart concentrations with dosage time of 1sec
t (min)
C
H
(t) (mg/L)
0
2
4
6
8
10
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
Transformed lung concentrations
t (min)
a C
L
(t)
b
(mg/L)
WAOD=?GL4IM,,' *)]E;CF3 '( )]nu1;GU_ + ý7PL4X`1;CF38?E +4!?.Ëý7ý5/ECF3"+4!?.^9MF.
0
2
4
6
8
10
0
0.5
1
1.5
2
2.5
Heart conc., dosage time = 1min
t (min)
C
H
(t) (mg/L)
0
2
4
6
8
10
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
Transformed Lung conc.
t (min)
aC
L
(t)
b
(mg/L)
WAOD=?GL4IZ,' *)]E;CF3 '
(
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Time (minutes)
Dose rate (mg/min)
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Time (minutes)
Concentration (mg/L)
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Constant dose rate strategy
Triangle dose rate strategy
0
2
4
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1
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Time (minutes)
Concentration (mg/L)
Drug in the heart for two strategies
Constant dose rate strategy
Triangle dose rate strategy
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Time (minutes)
Concentration (mg/L)
Concentration into lung for two injection times
Injection over 1 minute
Injection over 1 second
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