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

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

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 o Co difie d kno wle dg e o E mpiric a l studie s • Pa te nt a nd c ita tio ns o L o c a liza tio n o f kno wle dg e diffusio n • Pub lic a tio n a nd c ita tio ns o 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 o 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 o Spa c e e ffe c t • Physic a l pro ximity a nd so c ia l ne two rk o Co untry use d a s the g e o g ra phic unit o 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 o

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. Confirmed 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

Data • Se e d a rtic le s o SCI pub lic a tio ns fro m Wo S o Re se a rc h a rtic le s o WC=Physic s, Multidisc iplina ry o Pub lishe d during De c 16–31th fo r thre e ye a rs: 1990, 2000 a nd 2010 Ye a r Se e d Artic le s Citing Artic le s • Citing a rtic le s 1990 225 11,200 o All c ita tio ns b y ye a r 2015 fo r e a c h se e d a rtic le 2000 238 9,970 o All type s o f pub lic a tio ns 2010 342 10,005 T o ta l 805 31,175

Speed of diffusion 25% 1990_DC 1990_FC 20% 2000_DC 2000_FC Co untry lo c a tio n • 2010_DC Do me stic c ita tio n (DC) o 15% F o re ig n c ita tio n (F C) o 2010_FC Sha re o f DC a nd F C • 10% 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 5% F C 0% 1990 1995 2000 2005 2010 2015

Summary statistics of variables VARIABLES N mean sd min max TC it 11,694 2.628 6.864 0 129 DC it 11,694 1.023 2.835 0 51 FC it 11,694 1.605 4.721 0 102 DIFF_FC_DC it 11,694 0.581 3.678 -25 81 Time it 11,694 9.124 7.057 0 25 Time 2 11,694 133.0 165.5 0 625 it Country_num i 11,694 1.328 1.064 1 37 IF i 11,694 4.572 3.138 1.359 17.49 US i 11,694 0.302 0.459 0 1 PY1990 i 11,694 0.500 0.500 0 1 PY2000 i 11,694 0.324 0.468 0 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*** Time 2 -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 o Simila r re se a rc h a g e nda due to na tio na l po lic y o r funding o F o 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 o I nte rna tio na l re se a rc h c o mmunity is muc h mo re wide r o