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Volumn 8, Issue 49, 2016, Pages 34034-34044

Dual Physically Cross-Linked Double Network Hydrogels with High Mechanical Strength, Fatigue Resistance, Notch-Insensitivity, and Self-Healing Properties

Author keywords

double network hydrogels; fatigue resistance; high mechanical strength; notch insensitivity; self healing

Indexed keywords

BOND STRENGTH (CHEMICAL); CHEMICAL ANALYSIS; CROSSLINKING; FATIGUE OF MATERIALS; HYDROGEN BONDS; INFRARED SPECTROSCOPY; POLYACRYLATES; THERMOGRAVIMETRIC ANALYSIS; UNLOADING;

EID: 85006293475     PISSN: 19448244     EISSN: 19448252     Source Type: Journal    
DOI: 10.1021/acsami.6b12243     Document Type: Article
Times cited : (210)

References (53)
  • 1
    • 84925121149 scopus 로고    scopus 로고
    • In Vitro Platelet Adhesion of PNaAMPS/PAAm and PNaAMPS/PDMAAm Double-Network Hydrogels
    • Zheng, W. J.; Liu, Z. Q.; Xu, F.; Gao, J.; Chen, Y. M.; Gong, J. P.; Osada, Y. In Vitro Platelet Adhesion of PNaAMPS/PAAm and PNaAMPS/PDMAAm Double-Network Hydrogels Macromol. Chem. Phys. 2015, 216, 641-649 10.1002/macp.201400481
    • (2015) Macromol. Chem. Phys. , vol.216 , pp. 641-649
    • Zheng, W.J.1    Liu, Z.Q.2    Xu, F.3    Gao, J.4    Chen, Y.M.5    Gong, J.P.6    Osada, Y.7
  • 2
    • 84863938895 scopus 로고    scopus 로고
    • Novel Phosphorescent Hydrogels Based on an IrIII Metal Complex
    • Li, Z.; Wei, Z.; Xu, F.; Li, Y. H.; Lu, T. J.; Chen, Y. M.; Zhou, G. J. Novel Phosphorescent Hydrogels Based on an IrIII Metal Complex Macromol. Rapid Commun. 2012, 33, 1191-1196 10.1002/marc.201200136
    • (2012) Macromol. Rapid Commun. , vol.33 , pp. 1191-1196
    • Li, Z.1    Wei, Z.2    Xu, F.3    Li, Y.H.4    Lu, T.J.5    Chen, Y.M.6    Zhou, G.J.7
  • 4
    • 37349033581 scopus 로고    scopus 로고
    • Preparation of Fast Response Superabsorbent Hydrogels by Radiation Polymerization and Crosslinking of N-Isopropylacrylamide in Solution
    • El-Mohdy, H. L. A.; Safrany, A. Preparation of Fast Response Superabsorbent Hydrogels by Radiation Polymerization and Crosslinking of N-Isopropylacrylamide in Solution Radiat. Phys. Chem. 2008, 77, 273-279 10.1016/j.radphyschem.2007.05.006
    • (2008) Radiat. Phys. Chem. , vol.77 , pp. 273-279
    • El-Mohdy, H.L.A.1    Safrany, A.2
  • 5
    • 0346338109 scopus 로고    scopus 로고
    • Smart Polymeric Materials: Emerging Biochemical Applications
    • Roy, I.; Gupta, M. N. Smart Polymeric Materials: Emerging Biochemical Applications Chem. Biol. 2003, 10, 1161-1171 10.1016/j.chembiol.2003.12.004
    • (2003) Chem. Biol. , vol.10 , pp. 1161-1171
    • Roy, I.1    Gupta, M.N.2
  • 6
    • 0035981078 scopus 로고    scopus 로고
    • Environment-Sensitive Hydrogels for Drug Delivery
    • Qiu, Y.; Park, K. Environment-Sensitive Hydrogels for Drug Delivery Adv. Drug Delivery Rev. 2001, 53, 321-339 10.1016/S0169-409X(01)00203-4
    • (2001) Adv. Drug Delivery Rev. , vol.53 , pp. 321-339
    • Qiu, Y.1    Park, K.2
  • 7
    • 0035385135 scopus 로고    scopus 로고
    • Hydrogels for Tissue Engineering
    • Lee, K. Y.; Mooney, D. J. Hydrogels for Tissue Engineering Chem. Rev. 2001, 101, 1869-1879 10.1021/cr000108x
    • (2001) Chem. Rev. , vol.101 , pp. 1869-1879
    • Lee, K.Y.1    Mooney, D.J.2
  • 9
    • 84859587794 scopus 로고    scopus 로고
    • Super Tough Double Network Hydrogels and Their Application as Biomaterials
    • Haque, M. A.; Kurokawa, T.; Gong, J. P. Super Tough Double Network Hydrogels and Their Application as Biomaterials Polymer 2012, 53, 1805-1822 10.1016/j.polymer.2012.03.013
    • (2012) Polymer , vol.53 , pp. 1805-1822
    • Haque, M.A.1    Kurokawa, T.2    Gong, J.P.3
  • 10
    • 68549140331 scopus 로고    scopus 로고
    • First Observation of Stick-Slip Instability in Tearing of Poly(vinyl alcohol) Gel Sheets
    • Tanaka, Y.; Abe, H.; Kurokawa, T.; Furukawa, H.; Gong, J. P. First Observation of Stick-Slip Instability in Tearing of Poly(vinyl alcohol) Gel Sheets Macromolecules 2009, 42, 5425-5426 10.1021/ma900619e
    • (2009) Macromolecules , vol.42 , pp. 5425-5426
    • Tanaka, Y.1    Abe, H.2    Kurokawa, T.3    Furukawa, H.4    Gong, J.P.5
  • 11
    • 16244365565 scopus 로고    scopus 로고
    • Mechanically Strong Hydrogels with Ultra-Low Frictional Coefficients
    • Kaneko, D.; Tada, T.; Kurokawa, T.; Gong, J. P.; Osada, Y. Mechanically Strong Hydrogels with Ultra-Low Frictional Coefficients Adv. Mater. 2005, 17, 535-538 10.1002/adma.200400739
    • (2005) Adv. Mater. , vol.17 , pp. 535-538
    • Kaneko, D.1    Tada, T.2    Kurokawa, T.3    Gong, J.P.4    Osada, Y.5
  • 12
    • 84897989935 scopus 로고    scopus 로고
    • Materials both Tough and Soft
    • Gong, J. P. Materials both Tough and Soft Science 2014, 344, 161-162 10.1126/science.1252389
    • (2014) Science , vol.344 , pp. 161-162
    • Gong, J.P.1
  • 13
    • 84882451540 scopus 로고    scopus 로고
    • A Robust, One-Pot Synthesis of Highly Mechanical and Recoverable Double Network Hydrogels Using Thermoreversible Sol-Gel Polysaccharide
    • Chen, Q.; Zhu, L.; Zhao, C.; Wang, Q. M.; Zheng, J. A Robust, One-Pot Synthesis of Highly Mechanical and Recoverable Double Network Hydrogels Using Thermoreversible Sol-Gel Polysaccharide Adv. Mater. 2013, 25, 4171-4176 10.1002/adma.201300817
    • (2013) Adv. Mater. , vol.25 , pp. 4171-4176
    • Chen, Q.1    Zhu, L.2    Zhao, C.3    Wang, Q.M.4    Zheng, J.5
  • 15
    • 34748893792 scopus 로고    scopus 로고
    • Importance of Entanglement between First and Second Components in High-Strength Double Network Gels
    • Huang, M.; Furukawa, H.; Tanaka, Y.; Nakajima, T.; Osada, Y.; Gong, J. P. Importance of Entanglement between First and Second Components in High-Strength Double Network Gels Macromolecules 2007, 40, 6658-6664 10.1021/ma062482q
    • (2007) Macromolecules , vol.40 , pp. 6658-6664
    • Huang, M.1    Furukawa, H.2    Tanaka, Y.3    Nakajima, T.4    Osada, Y.5    Gong, J.P.6
  • 18
    • 21644450291 scopus 로고    scopus 로고
    • Determination of Fracture Energy of High Strength Double Network Hydrogels
    • Tanaka, Y.; Kuwabara, R.; Na, Y. H.; Kurokawa, T.; Gong, J. P.; Osada, Y. Determination of Fracture Energy of High Strength Double Network Hydrogels J. Phys. Chem. B 2005, 109, 11559-11562 10.1021/jp0500790
    • (2005) J. Phys. Chem. B , vol.109 , pp. 11559-11562
    • Tanaka, Y.1    Kuwabara, R.2    Na, Y.H.3    Kurokawa, T.4    Gong, J.P.5    Osada, Y.6
  • 20
    • 85027919991 scopus 로고    scopus 로고
    • A Novel Design Strategy for Fully Physically Linked Double Network Hydrogels with Tough, Fatigue Resistant, and Self-Healing Properties
    • Chen, Q.; Zhu, L.; Chen, H.; Yan, H. L.; Huang, L. N.; Yang, J.; Zheng, J. A Novel Design Strategy for Fully Physically Linked Double Network Hydrogels with Tough, Fatigue Resistant, and Self-Healing Properties Adv. Funct. Mater. 2015, 25, 1598-1607 10.1002/adfm.201404357
    • (2015) Adv. Funct. Mater. , vol.25 , pp. 1598-1607
    • Chen, Q.1    Zhu, L.2    Chen, H.3    Yan, H.L.4    Huang, L.N.5    Yang, J.6    Zheng, J.7
  • 21
    • 84929492240 scopus 로고    scopus 로고
    • Fundamentals of Double Network Hydrogels
    • Chen, Q.; Chen, H.; Zhu, L.; Zheng, J. Fundamentals of Double Network Hydrogels J. Mater. Chem. B 2015, 3, 3654-3676 10.1039/C5TB00123D
    • (2015) J. Mater. Chem. B , vol.3 , pp. 3654-3676
    • Chen, Q.1    Chen, H.2    Zhu, L.3    Zheng, J.4
  • 22
    • 77953299802 scopus 로고    scopus 로고
    • Why Are Double Network Hydrogels so Tough?
    • Gong, J. P. Why Are Double Network Hydrogels So Tough? Soft Matter 2010, 6, 2583-2590 10.1039/b924290b
    • (2010) Soft Matter , vol.6 , pp. 2583-2590
    • Gong, J.P.1
  • 23
    • 84871863729 scopus 로고    scopus 로고
    • Double Hydrogen-Bonding pH-Sensitive Hydrogels Retaining High-Strengths over a Wide pH Range
    • Gao, H.; Wang, N.; Hu, X. F.; Nan, W. J.; Han, Y. J.; Liu, W. G. Double Hydrogen-Bonding pH-Sensitive Hydrogels Retaining High-Strengths Over a Wide pH Range Macromol. Rapid Commun. 2013, 34, 63-68 10.1002/marc.201200548
    • (2013) Macromol. Rapid Commun. , vol.34 , pp. 63-68
    • Gao, H.1    Wang, N.2    Hu, X.F.3    Nan, W.J.4    Han, Y.J.5    Liu, W.G.6
  • 24
    • 39749132924 scopus 로고    scopus 로고
    • Self-Healing and Thermoreversible Rubber from Supramolecular Assembly
    • Cordier, P.; Tournilhac, F.; Soulie-Ziakovic, C.; Leibler, L. Self-Healing and Thermoreversible Rubber from Supramolecular Assembly Nature 2008, 451, 977-980 10.1038/nature06669
    • (2008) Nature , vol.451 , pp. 977-980
    • Cordier, P.1    Tournilhac, F.2    Soulie-Ziakovic, C.3    Leibler, L.4
  • 25
    • 82955205911 scopus 로고    scopus 로고
    • Viscoelastic and Mechanical Behavior of Hydrophobically Modified Hydrogels
    • Hao, J. K.; Weiss, R. A. Viscoelastic and Mechanical Behavior of Hydrophobically Modified Hydrogels Macromolecules 2011, 44, 9390-9398 10.1021/ma202130u
    • (2011) Macromolecules , vol.44 , pp. 9390-9398
    • Hao, J.K.1    Weiss, R.A.2
  • 27
    • 77955312692 scopus 로고    scopus 로고
    • Ionically Cross-Linked Triblock Copolymer Hydrogels with High Strength
    • Henderson, K. J.; Zhou, T. C.; Otim, K. J.; Shull, K. R. Ionically Cross-Linked Triblock Copolymer Hydrogels with High Strength Macromolecules 2010, 43, 6193-6201 10.1021/ma100963m
    • (2010) Macromolecules , vol.43 , pp. 6193-6201
    • Henderson, K.J.1    Zhou, T.C.2    Otim, K.J.3    Shull, K.R.4
  • 29
  • 30
    • 84875831206 scopus 로고    scopus 로고
    • Ionic-Covalent Entanglement Hydrogels from Gellan Gum, Carrageenan and an Epoxy-Amine
    • Stevens, L.; Calvert, P.; Wallace, G. G.; Panhuis, M. I. H. Ionic-Covalent Entanglement Hydrogels from Gellan Gum, Carrageenan and an Epoxy-Amine Soft Matter 2013, 9, 3009-3012 10.1039/c3sm27413f
    • (2013) Soft Matter , vol.9 , pp. 3009-3012
    • Stevens, L.1    Calvert, P.2    Wallace, G.G.3    Panhuis, M.I.H.4
  • 31
    • 84969531780 scopus 로고    scopus 로고
    • Superior Hybrid Hydrogels of Polyacrylamide Enhanced by Bacterial Cellulose Nanofiber Clusters
    • Yuan, N. X.; Xu, L.; Zhang, L.; Ye, H. W.; Zhao, J. H.; Liu, Z.; Rong, J. H. Superior Hybrid Hydrogels of Polyacrylamide Enhanced by Bacterial Cellulose Nanofiber Clusters Mater. Sci. Eng., C 2016, 67, 221-230 10.1016/j.msec.2016.04.074
    • (2016) Mater. Sci. Eng., C , vol.67 , pp. 221-230
    • Yuan, N.X.1    Xu, L.2    Zhang, L.3    Ye, H.W.4    Zhao, J.H.5    Liu, Z.6    Rong, J.H.7
  • 33
    • 84924858071 scopus 로고    scopus 로고
    • Xanthan Gum: A Versatile Biopolymer for Biomedical and Technological Applications
    • Petri, D. F. S. Xanthan Gum: A Versatile Biopolymer for Biomedical and Technological Applications J. Appl. Polym. Sci. 2015, 132, n/a 10.1002/app.42035
    • (2015) J. Appl. Polym. Sci. , vol.132 , pp. n/a
    • Petri, D.F.S.1
  • 34
    • 79956204397 scopus 로고    scopus 로고
    • Production, Recovery and Applications of Xanthan Gum by Xanthomonas Campestris
    • Palaniraj, A.; Jayaraman, V. Production, Recovery and Applications of Xanthan Gum by Xanthomonas Campestris J. Food Eng. 2011, 106, 1-12 10.1016/j.jfoodeng.2011.03.035
    • (2011) J. Food Eng. , vol.106 , pp. 1-12
    • Palaniraj, A.1    Jayaraman, V.2
  • 35
    • 79959461132 scopus 로고    scopus 로고
    • Tough and Self-Healing Hydrogels Formed via Hydrophobic Interactions
    • Tuncaboylu, D. C.; Sari, M.; Oppermann, W.; Okay, O. Tough and Self-Healing Hydrogels Formed via Hydrophobic Interactions Macromolecules 2011, 44, 4997-5005 10.1021/ma200579v
    • (2011) Macromolecules , vol.44 , pp. 4997-5005
    • Tuncaboylu, D.C.1    Sari, M.2    Oppermann, W.3    Okay, O.4
  • 36
    • 0001633131 scopus 로고    scopus 로고
    • Emulsion Polymerization of Hydrophobic Monomers Like Stearyl Acrylate with Cyclodextrin as a Phase Transfer Agent
    • Leyrer, R. J.; Machtle, W. Emulsion Polymerization of Hydrophobic Monomers Like Stearyl Acrylate with Cyclodextrin as a Phase Transfer Agent Macromol. Chem. Phys. 2000, 201, 1235-1243 10.1002/1521-3935(20000801)201:12<1235::AID-MACP1235>3.0.CO;2-#
    • (2000) Macromol. Chem. Phys. , vol.201 , pp. 1235-1243
    • Leyrer, R.J.1    Machtle, W.2
  • 37
    • 84868374599 scopus 로고    scopus 로고
    • Structure Optimization of Self-Healing Hydrogels Formed via Hydrophobic Interactions
    • Tuncaboylu, D. C.; Argun, A.; Sahin, M.; Sari, M.; Okay, O. Structure Optimization of Self-Healing Hydrogels Formed via Hydrophobic Interactions Polymer 2012, 53, 5513-5522 10.1016/j.polymer.2012.10.015
    • (2012) Polymer , vol.53 , pp. 5513-5522
    • Tuncaboylu, D.C.1    Argun, A.2    Sahin, M.3    Sari, M.4    Okay, O.5
  • 38
    • 85027946328 scopus 로고    scopus 로고
    • A Mechanically Strong, Highly Stable, Thermoplastic, and Self-Healable Supramolecular Polymer Hydrogel
    • Dai, X. Y.; Zhang, Y. Y.; Gao, L. N.; Bai, T.; Wang, W.; Cui, Y. L.; Liu, W. G. A Mechanically Strong, Highly Stable, Thermoplastic, and Self-Healable Supramolecular Polymer Hydrogel Adv. Mater. 2015, 27, 3566-3571 10.1002/adma.201500534
    • (2015) Adv. Mater. , vol.27 , pp. 3566-3571
    • Dai, X.Y.1    Zhang, Y.Y.2    Gao, L.N.3    Bai, T.4    Wang, W.5    Cui, Y.L.6    Liu, W.G.7
  • 39
    • 84875140366 scopus 로고    scopus 로고
    • Promoted Cell Proliferation and Mechanical Relaxation of Nanocomposite Hydrogels Prepared in Cell Culture Medium
    • Wang, T.; Sun, W. X.; Liu, X. X.; Wang, C. Y.; Fu, S. Y.; Tong, Z. Promoted Cell Proliferation and Mechanical Relaxation of Nanocomposite Hydrogels Prepared in Cell Culture Medium React. Funct. Polym. 2013, 73, 683-689 10.1016/j.reactfunctpolym.2013.02.012
    • (2013) React. Funct. Polym. , vol.73 , pp. 683-689
    • Wang, T.1    Sun, W.X.2    Liu, X.X.3    Wang, C.Y.4    Fu, S.Y.5    Tong, Z.6
  • 40
    • 67649204112 scopus 로고    scopus 로고
    • Direct Observation of Damage Zone around Crack Tips in Double-Network Gels
    • Yu, Q. M.; Tanaka, Y.; Furukawa, H.; Kurokawa, T.; Gong, J. P. Direct Observation of Damage Zone around Crack Tips in Double-Network Gels Macromolecules 2009, 42, 3852-3855 10.1021/ma900622s
    • (2009) Macromolecules , vol.42 , pp. 3852-3855
    • Yu, Q.M.1    Tanaka, Y.2    Furukawa, H.3    Kurokawa, T.4    Gong, J.P.5
  • 42
    • 84874031917 scopus 로고    scopus 로고
    • Mechanically Strong Hydrogels with Reversible Behaviour under Cyclic Compression with MPa Loading
    • Harrass, K.; Kruger, R.; Moller, M.; Albrecht, K.; Groll, J. Mechanically Strong Hydrogels with Reversible Behaviour under Cyclic Compression with MPa Loading Soft Matter 2013, 9, 2869-2877 10.1039/c2sm27603h
    • (2013) Soft Matter , vol.9 , pp. 2869-2877
    • Harrass, K.1    Kruger, R.2    Moller, M.3    Albrecht, K.4    Groll, J.5
  • 43
    • 84886028632 scopus 로고    scopus 로고
    • Self-Healing Polyacrylic Acid Hydrogels
    • Gulyuz, U.; Okay, O. Self-Healing Polyacrylic Acid Hydrogels Soft Matter 2013, 9, 10287-10293 10.1039/c3sm52015c
    • (2013) Soft Matter , vol.9 , pp. 10287-10293
    • Gulyuz, U.1    Okay, O.2
  • 44
    • 0032032025 scopus 로고    scopus 로고
    • Associating Behaviour of Polyacrylamides Hydrophobically Modified with Dihexylacrylamide
    • Volpert, E.; Selb, J.; Candau, F. Associating Behaviour of Polyacrylamides Hydrophobically Modified with Dihexylacrylamide Polymer 1998, 39, 1025-1033 10.1016/S0032-3861(97)00393-5
    • (1998) Polymer , vol.39 , pp. 1025-1033
    • Volpert, E.1    Selb, J.2    Candau, F.3
  • 45
    • 84908144344 scopus 로고    scopus 로고
    • Self-Healing Poly(acrylic acid) Hydrogels with Shape Memory Behavior of High Mechanical Strength
    • Gulyuz, U.; Okay, O. Self-Healing Poly(acrylic acid) Hydrogels with Shape Memory Behavior of High Mechanical Strength Macromolecules 2014, 47, 6889-6899 10.1021/ma5015116
    • (2014) Macromolecules , vol.47 , pp. 6889-6899
    • Gulyuz, U.1    Okay, O.2
  • 47
    • 84855881670 scopus 로고    scopus 로고
    • Synthesis, Characterization and Physical Properties of a Novel Xanthan Gum/Polypyrrole Nanocomposite
    • Darzi, H. H.; Larimi, S. G.; Darzi, G. N. Synthesis, Characterization and Physical Properties of a Novel Xanthan Gum/Polypyrrole Nanocomposite Synth. Met. 2012, 162, 236-239 10.1016/j.synthmet.2011.12.004
    • (2012) Synth. Met. , vol.162 , pp. 236-239
    • Darzi, H.H.1    Larimi, S.G.2    Darzi, G.N.3
  • 48
    • 2642548966 scopus 로고    scopus 로고
    • Thermal Studies on Natural and Modified Gums
    • Zohuriaan, M. J.; Shokrolahi, F. Thermal Studies on Natural and Modified Gums Polym. Test. 2004, 23, 575-579 10.1016/j.polymertesting.2003.11.001
    • (2004) Polym. Test. , vol.23 , pp. 575-579
    • Zohuriaan, M.J.1    Shokrolahi, F.2
  • 50
    • 0034148936 scopus 로고    scopus 로고
    • Preparation and Thermal Study of Polymers Derived from Acrylamide
    • Silva, M. E. S. R. E.; Dutra, E. R.; Mano, V.; Machado, J. C. Preparation and Thermal Study of Polymers Derived from Acrylamide Polym. Degrad. Stab. 2000, 67, 491-495 10.1016/S0141-3910(99)00149-4
    • (2000) Polym. Degrad. Stab. , vol.67 , pp. 491-495
    • Silva, M.E.S.R.E.1    Dutra, E.R.2    Mano, V.3    Machado, J.C.4
  • 51
    • 0000429023 scopus 로고
    • The Thermal Degradation of Polymethacrylamide and Copolymers of Methacrylamide and Methyl Methacrylate
    • Grassie, N.; McNeill, I. C.; Samson, J. N. R. The Thermal Degradation of Polymethacrylamide and Copolymers of Methacrylamide and Methyl Methacrylate Eur. Polym. J. 1978, 14, 931-937 10.1016/0014-3057(78)90092-7
    • (1978) Eur. Polym. J. , vol.14 , pp. 931-937
    • Grassie, N.1    McNeill, I.C.2    Samson, J.N.R.3
  • 52
    • 0019661115 scopus 로고
    • Adsorbed Metal Ions as Stabilizers for the Thermal Degradation of Polyacrylamide
    • Burrows, H. D.; Ellis, H. A.; Utah, S. I. Adsorbed Metal Ions as Stabilizers for the Thermal Degradation of Polyacrylamide Polymer 1981, 22, 1740-1744 10.1016/0032-3861(81)90397-9
    • (1981) Polymer , vol.22 , pp. 1740-1744
    • Burrows, H.D.1    Ellis, H.A.2    Utah, S.I.3
  • 53
    • 84908519599 scopus 로고    scopus 로고
    • Determination of Pyrolysis Characteristics and Kinetics of Palm Kernel Shell Using TGA-FTIR and Model-Free Integral Methods
    • Ma, Z. Q.; Chen, D. Y.; Gu, J.; Bao, B. F.; Zhang, Q. S. Determination of Pyrolysis Characteristics and Kinetics of Palm Kernel Shell Using TGA-FTIR and Model-Free Integral Methods Energy Convers. Manage. 2015, 89, 251-259 10.1016/j.enconman.2014.09.074
    • (2015) Energy Convers. Manage. , vol.89 , pp. 251-259
    • Ma, Z.Q.1    Chen, D.Y.2    Gu, J.3    Bao, B.F.4    Zhang, Q.S.5


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.