Knowledge without borders? A re-investigation from the spatial and - - PowerPoint PPT Presentation

Knowledge without borders? A re-investigation from the spatial and temporal perspective

Jue WANG L iwe i ZHANG Na nya ng T e c hno lo g ic a l Unive rsity, Sing a po re

Prepared for the 7th Global TechMining Conference, Oct 9th 2017

Introduction

• K

no wle dg e diffusio n a nd spa tia l c o nstra ints

• T

a c it kno wle dg e

• Co difie d kno wle dg e
• E

mpiric a l studie s

• Pa te nt a nd c ita tio ns
• L
• c a liza tio n o f kno wle dg e diffusio n
• Pub lic a tio n a nd c ita tio ns
• L

e ss lo c a lize d?

• No stro ng e vide nc e

Research questions

• Whe the r the spa tia l b o unda ry in the disse mina tio n o f pub lic a tio ns is

inde e d le ss visib le ?

• I

f no t, ho w it ma tte rs?

Theoretical framework

• He te ro g e ne o us diffusio n mo de l (Stra ng & T

uma , 1993)

• Spa tia l he te ro g e ne ity: va ria tio n in the c ha nc e fo r me mb e rs in the po pula tio n a ffe c ting a nd b e ing

a ffe c te d b y e a c h o the r

• T

e mpo ra l he te ro g e ne ity: the po te ntia l a do ptio n va rie s with the le ng th o f time sinc e the ir o c c urre nc e

• Spa c e e ffe c t
• Physic a l pro ximity a nd so c ia l ne two rk
• Co untry use d a s the g e o g ra phic unit
• L

a ng ua g e s, histo ry, c ulture , a nd po litic a l institutio ns

• T

ime e ffe c t

• Spa c e e ffe c t is mo re e vide nt fo r ne wly pro duc e d pub lic a tio ns

Hypotheses

• H1: K

no wle dg e diffuse s fa ste r in the do me stic re se a rc h c o mmunity in the e a rly ye a rs o f pub lic a tio n.

• H2: T

he pro xima l a dva nta g e in kno wle dg e diffusio n diminishe s a fte r the e a rly ye a rs o f pub lic a tio n.

Confirmed Confirmed

Data

• Se e d a rtic le s
• SCI

pub lic a tio ns fro m Wo S

• Re se a rc h a rtic le s
• WC=Physic s, Multidisc iplina ry
• Pub lishe d during De c 16–31th fo r thre e ye a rs: 1990, 2000 a nd 2010
• Citing a rtic le s
• All c ita tio ns b y ye a r 2015 fo r e a c h se e d a rtic le
• All type s o f pub lic a tio ns

Ye a r Se e d Artic le s Citing Artic le s

1990 225 11,200 2000 238 9,970 2010 342 10,005 T

• ta l

805 31,175

Speed of diffusion

• Co untry lo c a tio n
• Do me stic c ita tio n (DC)
• F
• re ig n c ita tio n (F

C)

• Sha re o f DC a nd F

C

• DC a c c umula te d

fa ste r a nd re a c he d the pe a k e a rlie r tha n F C

0% 5% 10% 15% 20% 25% 1990 1995 2000 2005 2010 2015

1990_DC 1990_FC 2000_DC 2000_FC 2010_DC 2010_FC

Summary statistics of variables

VARIABLES N mean sd min max TCit 11,694 2.628 6.864 129 DCit 11,694 1.023 2.835 51 FCit 11,694 1.605 4.721 102 DIFF_FC_DCit 11,694 0.581 3.678

• 25

81 Timeit 11,694 9.124 7.057 25 Time2

it

11,694 133.0 165.5 625 Country_numi 11,694 1.328 1.064 1 37 IFi 11,694 4.572 3.138 1.359 17.49 USi 11,694 0.302 0.459 1 PY1990i 11,694 0.500 0.500 1 PY2000i 11,694 0.324 0.468 1 Number of ID 805 805 805 805 805

Regression result

(1) (2) (3) (4) VARIABLES TC DC FC DIFF_FC_DC Time 0.189*** 0.014* 0.174*** 0.029*** Time2

• 0.009***
• 0.002***
• 0.008***

Country_num 0.130 0.202***

• 0.072
• 0.275***

IF 0.677*** 0.271*** 0.406*** 0.136*** US 0.731 0.713*** 0.019

• 0.688***

PY1990

• 1.570***
• 0.766***
• 0.804**

0.104 PY2000

• 1.351***
• 0.552***
• 0.799**

0.017 Constant

• 0.094
• 0.016
• 0.076

0.207 Observations 11,694 11,694 11,694 11,694 Number of ID 805 805 805 805

Findings and discussions

• K

no wle dg e diffusio n is inde e d a ffe c te d b y spa tia l b o unda rie s

• Do me stic c ita tio ns a c c umula te d fa ste r in the e a rly ye a rs o f

pub lic a tio ns tha n fo re ig n c ita tio ns

• So c ia l ne two rk a nd g e o g ra phic dista nc e
• Simila r re se a rc h a g e nda due to na tio na l po lic y o r funding
• F
• re ig n c ita tio ns pic k up a fe w ye a rs a fte r o f pub lic a tio n a nd la st

lo ng e r

• Whe n pub lic a tio n is visib le to the fie ld
• I

nte rna tio na l re se a rc h c o mmunity is muc h mo re wide r