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Volumn 33, Issue 1, 2013, Pages 40-53

Ultrasound and electric fields as novel techniques for assisting the wine ageing process: The state-of-the-art research

Author keywords

[No Author keywords available]

Indexed keywords

AGEING PROCESS; ANTI-MICROBIAL EFFECTS; EXTRACTION TECHNIQUES; HIGH QUALITY; NOVEL TECHNIQUES; PHENOLIC COMPOUNDS; WINE AGEING;

EID: 84883561045     PISSN: 09242244     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tifs.2013.06.005     Document Type: Review
Times cited : (102)

References (72)
  • 1
    • 84876441428 scopus 로고    scopus 로고
    • Ultrasound and antimicrobial compounds: a suitable way to control Fusarium oxysporum in Juices
    • Bevilacqua A., Sinigaglia M., Corbo M.R. Ultrasound and antimicrobial compounds: a suitable way to control Fusarium oxysporum in Juices. Food and Bioprocess Technology 2013, 6(5):1153-1163. http://dx.doi.org/10.1007/s11947-012-0782-0.
    • (2013) Food and Bioprocess Technology , vol.6 , Issue.5 , pp. 1153-1163
    • Bevilacqua, A.1    Sinigaglia, M.2    Corbo, M.R.3
  • 5
    • 0042232779 scopus 로고    scopus 로고
    • The effects of gamma irradiation on rice wine maturation
    • Chang A.C. The effects of gamma irradiation on rice wine maturation. Food Chemistry 2003, 83:323-327.
    • (2003) Food Chemistry , vol.83 , pp. 323-327
    • Chang, A.C.1
  • 6
    • 1042277784 scopus 로고    scopus 로고
    • The effects of different accelerating techniques on maize wine maturation
    • Chang A.C. The effects of different accelerating techniques on maize wine maturation. Food Chemistry 2004, 86:61-68.
    • (2004) Food Chemistry , vol.86 , pp. 61-68
    • Chang, A.C.1
  • 7
    • 15244347087 scopus 로고    scopus 로고
    • Study of ultrasonic wave treatments for accelerating the aging process in a rice alcoholic beverage
    • Chang A.C. Study of ultrasonic wave treatments for accelerating the aging process in a rice alcoholic beverage. Food Chemistry 2005, 92:337-342.
    • (2005) Food Chemistry , vol.92 , pp. 337-342
    • Chang, A.C.1
  • 8
    • 0036979949 scopus 로고    scopus 로고
    • The application of 20kHz ultrasonic waves to accelerate the aging of different wines
    • Chang A.C., Chen F.C. The application of 20kHz ultrasonic waves to accelerate the aging of different wines. Food Chemistry 2002, 79:501-506.
    • (2002) Food Chemistry , vol.79 , pp. 501-506
    • Chang, A.C.1    Chen, F.C.2
  • 9
    • 0037309891 scopus 로고    scopus 로고
    • Sonobioreactors: using ultrasound for enhanced microbial productivity
    • Chisti Y. Sonobioreactors: using ultrasound for enhanced microbial productivity. Trends in Biotechnology 2003, 21:89-93.
    • (2003) Trends in Biotechnology , vol.21 , pp. 89-93
    • Chisti, Y.1
  • 10
    • 84455200950 scopus 로고    scopus 로고
    • Effect of different ending fermentation technologies on microbial-stability of Italian Riesling low alcohol sweet white wine
    • Cui Y., Lv W., Liu J., Wang B. Effect of different ending fermentation technologies on microbial-stability of Italian Riesling low alcohol sweet white wine. Advanced Materials Research 2012, 393-395:1165-1168.
    • (2012) Advanced Materials Research , pp. 1165-1168
    • Cui, Y.1    Lv, W.2    Liu, J.3    Wang, B.4
  • 12
    • 84862122585 scopus 로고    scopus 로고
    • Effect of the aging on lees and other alternative techniques on the low molecular weight phenols of Tempranillo red wine aged in oak barrels
    • Del Barrio-Galán R., Pérez-Magariño S., Ortega-Heras M. Effect of the aging on lees and other alternative techniques on the low molecular weight phenols of Tempranillo red wine aged in oak barrels. Analytica Chimica Acta 2012, 732:53-63.
    • (2012) Analytica Chimica Acta , vol.732 , pp. 53-63
    • Del Barrio-Galán, R.1    Pérez-Magariño, S.2    Ortega-Heras, M.3
  • 13
    • 70349845545 scopus 로고    scopus 로고
    • Influence of ultrasound on freezing rate of immersion-frozen apples
    • Delgado A.E., Zheng L.Y., Sun D.-W. Influence of ultrasound on freezing rate of immersion-frozen apples. Food and Bioprocess Technology 2009, 2(3):263-270.
    • (2009) Food and Bioprocess Technology , vol.2 , Issue.3 , pp. 263-270
    • Delgado, A.E.1    Zheng, L.Y.2    Sun, D.-W.3
  • 15
    • 84957433289 scopus 로고    scopus 로고
    • Effects of pulsed electric fields on Cabernet Sauvignon grape berries and on the characteristics of wines
    • in press
    • Delsart C., Cholet C., Ghidossi R., Grimi N., Gontier E., Gény L., et al. Effects of pulsed electric fields on Cabernet Sauvignon grape berries and on the characteristics of wines. Food and Bioprocess Technology 2013, in press.
    • (2013) Food and Bioprocess Technology
    • Delsart, C.1    Cholet, C.2    Ghidossi, R.3    Grimi, N.4    Gontier, E.5    Gény, L.6
  • 16
    • 0001702447 scopus 로고
    • Formation of ethyl esters of tartaric acid during wine ageing: chemical and sensory effects
    • Edwards T.L., Singleton V.L., Boulton R. Formation of ethyl esters of tartaric acid during wine ageing: chemical and sensory effects. American Journal of Enology and Viticulture 1985, 36(2):118-124.
    • (1985) American Journal of Enology and Viticulture , vol.36 , Issue.2 , pp. 118-124
    • Edwards, T.L.1    Singleton, V.L.2    Boulton, R.3
  • 17
    • 84871926202 scopus 로고    scopus 로고
    • Pulsed electric field, ultrasound, and thermal pretreatments for better phenolic extraction during red fermentation
    • El Darra N., Grimi N., Maroun R.G., Louka N., Vorobiev E. Pulsed electric field, ultrasound, and thermal pretreatments for better phenolic extraction during red fermentation. European Food Research and Technology 2013, 236(1):47-56.
    • (2013) European Food Research and Technology , vol.236 , Issue.1 , pp. 47-56
    • El Darra, N.1    Grimi, N.2    Maroun, R.G.3    Louka, N.4    Vorobiev, E.5
  • 18
    • 0035641899 scopus 로고    scopus 로고
    • Release of polysaccharides by yeast and the influence of released polysaccharides on color stability and wine astringency
    • Escot S., Feuillat M., Dulau L., Charpentier C. Release of polysaccharides by yeast and the influence of released polysaccharides on color stability and wine astringency. Australian Journal of Grape and Wine Research 2001, 7:153-159.
    • (2001) Australian Journal of Grape and Wine Research , vol.7 , pp. 153-159
    • Escot, S.1    Feuillat, M.2    Dulau, L.3    Charpentier, C.4
  • 20
    • 84903362851 scopus 로고    scopus 로고
    • Cellviability and proteins release during ultrasound-assisted yeastlysis of light lees in model wine
    • García Martín J.F., Gillemet L., Feng C., Sun D.-W. Cellviability and proteins release during ultrasound-assisted yeastlysis of light lees in model wine. Food Chemistry 2013, 141:934-939.
    • (2013) Food Chemistry , vol.141 , pp. 934-939
    • García Martín, J.F.1    Gillemet, L.2    Feng, C.3    Sun, D.-W.4
  • 23
    • 67149139626 scopus 로고    scopus 로고
    • Optimization of ultrasound-assisted extraction of phenolic compounds, antioxidants, and anthocyanins from grape (Vitis vinifera) seeds
    • Ghafoor K., Choi Y.H., Jeon J.Y., Jo I.H. Optimization of ultrasound-assisted extraction of phenolic compounds, antioxidants, and anthocyanins from grape (Vitis vinifera) seeds. Journal of Agricultural and Food Chemistry 2009, 57:4988-4994.
    • (2009) Journal of Agricultural and Food Chemistry , vol.57 , pp. 4988-4994
    • Ghafoor, K.1    Choi, Y.H.2    Jeon, J.Y.3    Jo, I.H.4
  • 24
    • 0041549007 scopus 로고    scopus 로고
    • Color and phenolic compounds of a young red wine. Influence of wine-making techniques, storage temperature, and length of storage time
    • Gómez-Plaza E., Gil-Muñoz J., López-Roca J.M., Martínez A. Color and phenolic compounds of a young red wine. Influence of wine-making techniques, storage temperature, and length of storage time. Journal of Agricultural and Food Chemistry 2000, 48:736-741.
    • (2000) Journal of Agricultural and Food Chemistry , vol.48 , pp. 736-741
    • Gómez-Plaza, E.1    Gil-Muñoz, J.2    López-Roca, J.M.3    Martínez, A.4
  • 25
    • 0003916173 scopus 로고
    • Vol.I-II, Academic Press, New York. San Francisco, USA, 991-992
    • Harborne J.B., Mabry T.J., Mabry H. The flavonoids 1975, Vol.I-II:395-396. Academic Press, New York. San Francisco, USA, 991-992.
    • (1975) The flavonoids , pp. 395-396
    • Harborne, J.B.1    Mabry, T.J.2    Mabry, H.3
  • 26
    • 0033552076 scopus 로고    scopus 로고
    • Optimization of an extraction method of aroma compounds in white wine using ultrasound
    • Hernanz D., Heredia Mira F.J., Beltran R., Fernández M.A. Optimization of an extraction method of aroma compounds in white wine using ultrasound. Talanta 1999, 50:413-421.
    • (1999) Talanta , vol.50 , pp. 413-421
    • Hernanz, D.1    Heredia Mira, F.J.2    Beltran, R.3    Fernández, M.A.4
  • 27
    • 84867515986 scopus 로고    scopus 로고
    • Comparison of conventional and ultrasound assisted extraction techniques of yellow tea and bioactive composition of obtained extracts
    • Horzic D., Jambrak A.R., Belscak-Cvitanovic A., Komes D., Lelas V. Comparison of conventional and ultrasound assisted extraction techniques of yellow tea and bioactive composition of obtained extracts. Food and Bioprocess Technology 2012, 5(7):2858-2870. http://dx.doi.org/10.1007/s11947-012-0791-z.
    • (2012) Food and Bioprocess Technology , vol.5 , Issue.7 , pp. 2858-2870
    • Horzic, D.1    Jambrak, A.R.2    Belscak-Cvitanovic, A.3    Komes, D.4    Lelas, V.5
  • 28
    • 84883556006 scopus 로고    scopus 로고
    • Color y envejecimiento en vinos tintos de Rioja
    • Iñíguez M. Color y envejecimiento en vinos tintos de Rioja. Acenología 2000, 2.
    • (2000) Acenología , vol.2
    • Iñíguez, M.1
  • 31
    • 36649024091 scopus 로고    scopus 로고
    • High power ultrasonics as a novel tool offering new opportunities for managing wine microbiology
    • Jiranek V., Grbin P., Yap A., Barnes M., Bates D. High power ultrasonics as a novel tool offering new opportunities for managing wine microbiology. Biotechnology Letters 2008, 30:1-6.
    • (2008) Biotechnology Letters , vol.30 , pp. 1-6
    • Jiranek, V.1    Grbin, P.2    Yap, A.3    Barnes, M.4    Bates, D.5
  • 32
    • 80054680011 scopus 로고    scopus 로고
    • Ultrasound assisted nucleation of some liquid and solid model foods during freezing
    • Kiani H., Zhang Z., Delgado A., Sun D.-W. Ultrasound assisted nucleation of some liquid and solid model foods during freezing. Food Research International 2011, 44(9):2915-2921.
    • (2011) Food Research International , vol.44 , Issue.9 , pp. 2915-2921
    • Kiani, H.1    Zhang, Z.2    Delgado, A.3    Sun, D.-W.4
  • 34
    • 0036887430 scopus 로고    scopus 로고
    • Effect of power ultrasound on freezing rate during immersion freezing
    • Li B., Sun D.-W. Effect of power ultrasound on freezing rate during immersion freezing. Journal of Food Engineering 2002, 55(3):277-282.
    • (2002) Journal of Food Engineering , vol.55 , Issue.3 , pp. 277-282
    • Li, B.1    Sun, D.-W.2
  • 35
    • 84883557431 scopus 로고    scopus 로고
    • Ultraviolet-visible spectrum analysis of fresh dry red wine treated by ultra-high pressure
    • Li S., Duan X., Liu S., Yang G. Ultraviolet-visible spectrum analysis of fresh dry red wine treated by ultra-high pressure. Food Research and Development (China) 2005, 26:160-163.
    • (2005) Food Research and Development (China) , vol.26 , pp. 160-163
    • Li, S.1    Duan, X.2    Liu, S.3    Yang, G.4
  • 36
    • 84870494095 scopus 로고    scopus 로고
    • Effect of ultra-high pressure treatment on physical properties of fresh claret
    • Li S., Duan X., Liu S., Yang G. Effect of ultra-high pressure treatment on physical properties of fresh claret. Liquor-making Science & Technology (China) 2005, 8:61-64.
    • (2005) Liquor-making Science & Technology (China) , vol.8 , pp. 61-64
    • Li, S.1    Duan, X.2    Liu, S.3    Yang, G.4
  • 37
    • 77955082162 scopus 로고    scopus 로고
    • Ultrasound-assisted subcritical water extraction of proanthocyanidins from defatted grape seed and its antioxidant activity
    • Li C., Wang W., Yu H., Li J., Yang R. Ultrasound-assisted subcritical water extraction of proanthocyanidins from defatted grape seed and its antioxidant activity. Zhongguo Zhong Yao Za Zhi 2010, 35(8):967-972.
    • (2010) Zhongguo Zhong Yao Za Zhi , vol.35 , Issue.8 , pp. 967-972
    • Li, C.1    Wang, W.2    Yu, H.3    Li, J.4    Yang, R.5
  • 38
    • 77954496137 scopus 로고    scopus 로고
    • Acceleration of maturity of young sorghum (Kaoliang) spirits by linking nanogold photocatalyzed process to conventional biological aging-a kinetic approach
    • Lin L.Y., Peng C.C., Wang H.E., Chuang C.M., Yu T.H., Chen K.C., et al. Acceleration of maturity of young sorghum (Kaoliang) spirits by linking nanogold photocatalyzed process to conventional biological aging-a kinetic approach. Food and Bioprocess Technology 2008, 1:234-245.
    • (2008) Food and Bioprocess Technology , vol.1 , pp. 234-245
    • Lin, L.Y.1    Peng, C.C.2    Wang, H.E.3    Chuang, C.M.4    Yu, T.H.5    Chen, K.C.6
  • 39
    • 84867567519 scopus 로고    scopus 로고
    • Enhancement of ethanol-acetic acid esterification under room temperature and non-catalytic condition via pulsed electric field application
    • Lin Z.R., Zeng X.A., Yu S.J., Sun D.-W. Enhancement of ethanol-acetic acid esterification under room temperature and non-catalytic condition via pulsed electric field application. Food and Bioprocess Technology 2011, 5(7):2637-2645.
    • (2011) Food and Bioprocess Technology , vol.5 , Issue.7 , pp. 2637-2645
    • Lin, Z.R.1    Zeng, X.A.2    Yu, S.J.3    Sun, D.-W.4
  • 40
    • 84879306471 scopus 로고    scopus 로고
    • GC-MS analysis of aroma component variation of wine treated by high voltage pulse electric field
    • Liu X.J., Yin Y.G., Fan S.M., Zhu C., Luo G.C. GC-MS analysis of aroma component variation of wine treated by high voltage pulse electric field. Food Science 2006, 27(12):654-657.
    • (2006) Food Science , vol.27 , Issue.12 , pp. 654-657
    • Liu, X.J.1    Yin, Y.G.2    Fan, S.M.3    Zhu, C.4    Luo, G.C.5
  • 42
    • 46649117881 scopus 로고    scopus 로고
    • Application of pulsed electric fields for improving the maceration process during vinification of red wine: Influence of grape variety
    • López N., Puértolas E., Condón S., Álvarez I., Raso J. Application of pulsed electric fields for improving the maceration process during vinification of red wine: Influence of grape variety. European Food Research and Technology 2008, 227:1099-1107.
    • (2008) European Food Research and Technology , vol.227 , pp. 1099-1107
    • López, N.1    Puértolas, E.2    Condón, S.3    Álvarez, I.4    Raso, J.5
  • 43
    • 49849100689 scopus 로고    scopus 로고
    • Effects of pulsed electric fields on the extraction of phenolic compounds during the fermentation of must of Tempranillo grapes
    • López N., Puértolas E., Condón S., Álvarez I., Raso J. Effects of pulsed electric fields on the extraction of phenolic compounds during the fermentation of must of Tempranillo grapes. Innovative Food Science and Emerging Technologies 2008, 9:477-482.
    • (2008) Innovative Food Science and Emerging Technologies , vol.9 , pp. 477-482
    • López, N.1    Puértolas, E.2    Condón, S.3    Álvarez, I.4    Raso, J.5
  • 44
    • 84855284910 scopus 로고    scopus 로고
    • Viability of common wine spoilage organisms after exposure to high power ultrasonics
    • Luo H., Schmid F., Grbin P.R., Jiranek V. Viability of common wine spoilage organisms after exposure to high power ultrasonics. Ultrasonics Sonochemistry 2010, 19(3):415-420.
    • (2010) Ultrasonics Sonochemistry , vol.19 , Issue.3 , pp. 415-420
    • Luo, H.1    Schmid, F.2    Grbin, P.R.3    Jiranek, V.4
  • 50
    • 34447261195 scopus 로고    scopus 로고
    • Conventional and enzyme-assisted autolysis during ageing over lees in red wines: Influence on the release of polysaccharides from yeast cell walls and on wine monomeric anthocyanin content
    • Palomero F., Morata A., Benito S., González M.C., Suárez-Lepe J.A. Conventional and enzyme-assisted autolysis during ageing over lees in red wines: Influence on the release of polysaccharides from yeast cell walls and on wine monomeric anthocyanin content. Food Chemistry 2007, 105:838-846.
    • (2007) Food Chemistry , vol.105 , pp. 838-846
    • Palomero, F.1    Morata, A.2    Benito, S.3    González, M.C.4    Suárez-Lepe, J.A.5
  • 53
    • 76349121050 scopus 로고    scopus 로고
    • Improvement of winemaking process using pulsed electric fields at pilot-plant scale. Evolution of chromatic parameters and phenolic content of Cabernet Sauvignon red wines
    • Puértolas E., Hernández-Orte P., Saldaña G., Álvarez I., Raso J. Improvement of winemaking process using pulsed electric fields at pilot-plant scale. Evolution of chromatic parameters and phenolic content of Cabernet Sauvignon red wines. Food Research International 2010, 43:761-766.
    • (2010) Food Research International , vol.43 , pp. 761-766
    • Puértolas, E.1    Hernández-Orte, P.2    Saldaña, G.3    Álvarez, I.4    Raso, J.5
  • 55
    • 77249178232 scopus 로고    scopus 로고
    • Effect of pulsed electric field processing of red grapes on wine chromatic and phenolic characteristics during aging in oak barrels
    • Puértolas E., Saldaña G., Álvarez I., Raso J. Effect of pulsed electric field processing of red grapes on wine chromatic and phenolic characteristics during aging in oak barrels. Journal of Agricultural and Food Chemistry 2010, 58:2351-2357.
    • (2010) Journal of Agricultural and Food Chemistry , vol.58 , pp. 2351-2357
    • Puértolas, E.1    Saldaña, G.2    Álvarez, I.3    Raso, J.4
  • 56
    • 70449091820 scopus 로고    scopus 로고
    • Evolution of polyphenolic compounds in red wine from Cabernet Sauvignon grapes processed by pulsed electric fields during aging in bottle
    • Puértolas E., Saldaña G., Condón S., Álvarez I., Raso J. Evolution of polyphenolic compounds in red wine from Cabernet Sauvignon grapes processed by pulsed electric fields during aging in bottle. Food Chemistry 2010, 119:1063-1070.
    • (2010) Food Chemistry , vol.119 , pp. 1063-1070
    • Puértolas, E.1    Saldaña, G.2    Condón, S.3    Álvarez, I.4    Raso, J.5
  • 57
    • 70449461339 scopus 로고    scopus 로고
    • A comparison of the effect of macerating enzymes and pulsed electric fields technology on phenolic content and color of red wine
    • Puértolas E., Saldaña G., Condón S., Álvarez I., Raso J. A comparison of the effect of macerating enzymes and pulsed electric fields technology on phenolic content and color of red wine. Journal of Food Science 2009, 74:647-652.
    • (2009) Journal of Food Science , vol.74 , pp. 647-652
    • Puértolas, E.1    Saldaña, G.2    Condón, S.3    Álvarez, I.4    Raso, J.5
  • 61
    • 84939218604 scopus 로고
    • Sonochemical oxidation of phenol and three of its intermediate products in aqueous media: catechol, hydroquinone, and benzoquinose. Kinetic and mechanistic aspects
    • Serpone N., Terzian R., Colarusso P., Minero C., Pelizzetti E., Hidaka H. Sonochemical oxidation of phenol and three of its intermediate products in aqueous media: catechol, hydroquinone, and benzoquinose. Kinetic and mechanistic aspects. Research on Chemical Intermediates 1993, 18(2):183-202.
    • (1993) Research on Chemical Intermediates , vol.18 , Issue.2 , pp. 183-202
    • Serpone, N.1    Terzian, R.2    Colarusso, P.3    Minero, C.4    Pelizzetti, E.5    Hidaka, H.6
  • 63
    • 0000727430 scopus 로고
    • The polymeric nature of wine pigments
    • Somers T.C. The polymeric nature of wine pigments. Phytochemistry 1971, 10:2175-2186.
    • (1971) Phytochemistry , vol.10 , pp. 2175-2186
    • Somers, T.C.1
  • 64
  • 65
    • 0037401743 scopus 로고    scopus 로고
    • Microstructural change of potato tissues frozen by ultrasound-assisted immersion freezing
    • Sun D.-W., Li B. Microstructural change of potato tissues frozen by ultrasound-assisted immersion freezing. Journal of Food Engineering 2003, 57(4):337-345.
    • (2003) Journal of Food Engineering , vol.57 , Issue.4 , pp. 337-345
    • Sun, D.-W.1    Li, B.2
  • 66
    • 84888134676 scopus 로고    scopus 로고
    • Advances in wine ageing technologies for enhancing wine quality and accelerating wine ageing process
    • Tao Y., García J.F., Sun D.-W. Advances in wine ageing technologies for enhancing wine quality and accelerating wine ageing process. Critical Reviews in Food Science and Nutrition 2013, http://dx.doi.org/10.1080/10408398.2011.609949.
    • (2013) Critical Reviews in Food Science and Nutrition
    • Tao, Y.1    García, J.F.2    Sun, D.-W.3
  • 68
    • 62849114454 scopus 로고    scopus 로고
    • Effect of sonication on retention of anthocyanins in blackberry juice
    • Tiwari B.K., O'Donnell C.P., Cullen P.J. Effect of sonication on retention of anthocyanins in blackberry juice. Journal of Food Engineering 2009, 93:166-171.
    • (2009) Journal of Food Engineering , vol.93 , pp. 166-171
    • Tiwari, B.K.1    O'Donnell, C.P.2    Cullen, P.J.3
  • 70
    • 84862132043 scopus 로고    scopus 로고
    • Application of high-power ultrasound to improve adhesion of honey on roasted peanuts to improve oxidative stability
    • Wambura P., Tegete H., Verghese M. Application of high-power ultrasound to improve adhesion of honey on roasted peanuts to improve oxidative stability. Food and Bioprocess Technology 2012, 5(5):2012-2016. http://dx.doi.org/10.1007/s11947-010-0467-5.
    • (2012) Food and Bioprocess Technology , vol.5 , Issue.5 , pp. 2012-2016
    • Wambura, P.1    Tegete, H.2    Verghese, M.3
  • 72
    • 28444436246 scopus 로고    scopus 로고
    • Innovative applications of power ultrasound during food freezing processes - a review
    • Zheng L.Y., Sun D.-W. Innovative applications of power ultrasound during food freezing processes - a review. Trends in Food Science & Technology 2006, 17(1):16-23.
    • (2006) Trends in Food Science & Technology , vol.17 , Issue.1 , pp. 16-23
    • Zheng, L.Y.1    Sun, D.-W.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.