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윤상철 혜전대학 1991 論文集 Vol.9 No.-
Fabric hand are related close with mechanical properties of the fabric. In order to control or improve the fabric quality, we have to know how the hand is related with these mechanical properties. And the purpose of this study is to investigate the regression equation of total hand value(T. H. V) of the fabric by the stepwise block regression method introduced to HESC(Hand Evaluation and Standardization Committee.).
Cord機의 CYLINDER上의 氣流가 纖維에 미치는 영향에 關하여
尹相哲 혜전대학 1985 論文集 Vol.3 No.-
When a polyester sliver of 3500tex(50grain/yd) composed of 0.17tex(1.5den)×38mm crimped fibers was being produced by a flat card with cylinder speeds in 45, 100, 150, 200, 300, 400 or 500rpm, instantaneous photographs of fibers on the metallic wires were taken by using a flash gun of 10. microseconds through a specially-installed transparent plastic window in 200mm×100mm, attached on the front stripping door. In order to analyse the photographs of crimped fibers on the surface of the carding cylinder under the running condition, two kinds of simulation tests, a wind-tunnel test and a load-elongation test of single fibers, were carried out. From these experiments, we obtained the following conclusions. (1) Aerodynamic tensile force on a single fiber on the surface of the cylinder is about 1.5 to 3.0mg when the speed of cylinder is 150 to 300rpm. This tensile force is approximately one twenticth of the force to straighten out the crimp of the fiber. (2) The crimp per cent, i.e. the percentage of the reduced fiber length caused by crimp to the fully straightened fiber, is 17∼21% under such low cylinder speeds as 45∼100 rpm, suggesting insufficient carding action under these Conditions. (3) The crimp per cent is decreased from 10 to 7 by increasing the cylinder speed from 150rpm to 300rpm, indicating that fibers are carded being almost straightened, and efficent carding action is attained under this speed range of practical use. (4) Increasing the cylinder speed over 300rpm scarcely improves carding action because of the decreased decrement in the crimp per cent.
Servicization with skill premium in the digital economy
윤상철 한국무역학회 2018 Journal of Korea trade Vol.22 No.1
Purpose – The purpose of this paper is to examine an endogenous growth model, as a component of a broader study of servicization with skill premium and its policy implications in the evolving digital economy. Design/methodology/approach – This paper develops a two-sector endogenous growth model which allows for the observed characteristics of digitally empowered structural changes. Specifically, the driving force of economic growth is the expanding variety of intermediate services as a consequence of innovation in services. The introduction of new intermediate services specifically contributes to total factor productivity in the production of service sector, and thus an uneven growth path with skill premium toward a service economy generally exists. Findings – The principal finding of this paper is that the digitally empowered expanding variety of intermediate services due to innovation contributes significantly to total factor productivity in the production of service sector, and thus a servicization with skill premium generally exists along a steady-state path. In addition, this paper derives an optimal innovation policy to rule out the market failures due to innovation externality and market power in monopolistic competition conditions, and shows the Rybczynski effects of exogenous endowment changes in the evolving digital economy. Originality/value – The principal contribution of this paper is to determine how unbalanced endogenous growth along a steady-state path is linked with a service economy with skill premium in the evolving digital economy. In addition to this analysis, this paper provides policy implications – namely, that a positive but finite innovation subsidy can achieve the social optimum in the digital economy, and that an exogenous increase in high-skilled labor can speed up a digitally empowered economic growth.
Economic Integration with Endogenous Technological Change in Knowledge-based Services: A New Economy
윤상철 세종대학교 경제통합연구소 2004 Journal of Economic Integration Vol.19 No.1
This paper introduces a more sophisticated two-sector model of endogenous long-run growth without scale effects. The world economy consists of two similarly developed countries both of which are capable of producing manufacturings and services. The knowledge-based services as intermediate inputs are used most intensively in the service sector and in the ‘service’ functions of manufacturing sector. In order to highlight the implications of economic integration for long-run performance in the presence of digital markets, we conduct a sequence of comparisons of a country’s equilibrium growth path under the alternative scenarios of economic isolation and international integration. In this paper, we seek to reformulate the idea of Grossman and Helpman model to provide in further detail the nexus of increased productivity in the advanced economies through the digital marketplaces in the 1990s. This paper introduces a more sophisticated two-sector model of endogenous long-run growth without scale effects. The world economy consists of two similarly developed countries both of which are capable of producing manufacturings and services. The knowledge-based services as intermediate inputs are used most intensively in the service sector and in the ‘service’ functions of manufacturing sector. In order to highlight the implications of economic integration for long-run performance in the presence of digital markets, we conduct a sequence of comparisons of a country’s equilibrium growth path under the alternative scenarios of economic isolation and international integration. In this paper, we seek to reformulate the idea of Grossman and Helpman model to provide in further detail the nexus of increased productivity in the advanced economies through the digital marketplaces in the 1990s.