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Aggregate Productivity Growth and Firm Dynamics in Korean Manufacturing 2007–2017
김규일,박진호,송경호 한국국제경제학회 2021 International Economic Journal Vol.35 No.3
We study aggregate productivity growth of the Korean manufacturing industry for the 2007–2017 period after the Great Recession. We find the nature of such growth was quite different for two measures of productivity. For labor productivity, most of growth comes from productivity changes among surviving firms while, for TFP, most of the productivity growth comes from that of new entrants. We observe interesting industry dynamics, as exiting firms contributed positively to aggregate productivity growth, which suggests that the market had gradually eliminated firms of lower productivity in this period. Using the dynamic Olley and Pakes (1996. The dynamics of productivity in the telecommunications equipment industry. Econometrica, 64, 1263–1298.) decomposition, we find that a substantial productivity growth after the Great Recession was due to market share reallocations between firms, but this between-firm contribution has reduced since the recovery. Our industry sector level analysis also demonstrates that there has been heterogeneous productivity growth patterns and components across manufacturing sectors. Finally, we speculate that the wage level also plays a role as a moderating or accelerating factor for different productivity growth paths among surviving, entering, and exiting firms.
김규한,HYUN SAANG YOON 한국해양과학기술원 2018 Ocean science journal Vol.53 No.3
The walleye pollock (Gadus chalcogrammus) population in Korean waters had thrived until the mid-1980s, but this fish population has been depleted since the late 1990s. Limited data and lack of ecological research about the population prevented us from revealing the mechanism or material cause that resulted in the population’s collapse. Instead, we intended to examine possible hypotheses for the collapse, and built a statistical linear model, where juvenile fish, adult fish, and environmental factors were explored as variables. Because actual data on fish ages were not available, we estimated age compositions of the fish sample, applying the length-frequency analysis suggested by Schnute and Fournier (1980) to data on their lengths. Then we used the estimates of age compositions to determine adequate time lags between juvenile and adult stages in the statistical linear model. The selected final model suggested that the depletion of the fish population was associated with changes in water temperatures during April, June, and October and with adult abundance, but was not with the other species (e.g., sandfish (Arctoscopus japonicus) and flatfishes (Pleuronectidae sp.)) considered in the model. We further interpreted the results from ecological perspectives, referring to previous studies and ecological hypotheses.
감상 활동에서의 「음악본질」과 「음악하기」의 비교․통합을 위한 연구 - 기호론적 기능모델의 적용을 통하여 -
김규도 한국음악교육학회 2010 음악교육연구 Vol.38 No.-
An aesthetic approach that enhances aesthetic sensibility by understanding the composition factors of music and a praxial approach that develops musicality through the purposeful activities called ‘doing music’ are founded on ‘understanding’ and ‘activity’ in the subject matter system of a music department’s curriculum in my country, South Korea. The semiotic functional circle by Maria B. Spychinger=Lang clarifies the way where the musical education proceeds to by comparing and integrating Reimer’s aesthetic approach and Elliott’s praxial approach. This research is intended to find out the possibility for the study of ‘music essence’ and ‘doing music’ of an appreciative activity after the application of the semiotic functional circle to an appreciative activity in music classes. The significance of the semiotic approach is suggested from the study to perceive and impress the composition factors of music and the activity to express an image in the guidance plan of the appreciative lessons.