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한영철(HAN Young-Chul) 한국항만경제학회 1994 韓國港灣經濟學會誌 Vol.10 No.-
It is important that a company prodicts the demand a product it manufactures. The process of judgement in determining the quantity of the product that will be demanded in the market place at a given time is known as demand prediction. This is important not only in preventing losses due to the inventory accumulation that results from over-production, also as part of a social obligation of a corporation that has to aid in stablizing the market by appropriately meeting the demand.<br/> Such a demand prediction can be calculated using Method of least squares. the foundation of regression analysis, a statistical method of analyzing the relationship between two or more variables. It predicts how other variables react as the one variable changes. The relationship between the fertilizer supplied to a parcel of farmland and the yield, or people's income and demand for certain product can be considered examples.<br/> When a company wants to predict the market demand of its product. by obtaining trend formula using Method of least squares. Regression analysis is used to predict the future demand or the result. The advantages of Regression analysis are: prevention of error due to signes : it reflects all factor's since it doestn's exclude any limits' relatively simple.<br/> Accordingly, in this paper, the theoretical foundation and its regression analysis was investigated.
한영철(Han Young-Chul) 한국항만경제학회 1994 韓國港灣經濟學會誌 Vol.10 No.-
For researches on what causes trade and how result is shown, there is Adam Smith's theory of absolute production cost, followed by D.Ricardo's comparative production cost. Recently, it was advanced to H-O'sfactor proportions theory, which can be called one of the classic examples of traditional trade theory and explains the trade between nations.<br/> After the second war, with Leontief's paradox as the turning point, to explain the cause of trade, which is not possible traditional trade theory due to its limitations, a new theory, theory of trade within industry was introduced.<br/> This is what has been claimed in the traditional trade theory. It explains each nation's comparative advantage based on the factor intensity. It's not that there is a trade between different types of industries which are thought to obtain mutual trade benefit since each nation specialize and export in the field it has advantages. The theory of trade between the nations that had similar compardative factor intensity term of production factors which were hard to explain using traditional division theory, or trade between same type of industries which had relatively similar in intensities of factors.<br/> It can be said that these phenomena cannot be explained easily. as mentioned earlier, using traditional H-O model. It is because it was explained that each industry produces same quality goods, the comparative advantage of an industry is determined by intensities of factors and the nation's relative factor intensity rate of production factors, and trade between nations results bas sed on the structure of comparative advantage of each industry.<br/> However, according to a number of fact analysis, it was found that there is an increase of imports and exports within similar industries in a nation's trade. in trades between industrialized nations with similar factor intensity rate of production factors in particular, it can be seen that there is a increasing trend in trade of goods that have similar intensities of factors.<br/> Accordingly, in this research, a theoretical investigation of trade wi thin an industry was performed to measure the backgrand, cause, shape of trade wi thin an industry. Grubel & Lloyd index was used to measure the trade within an industry. Also used was trade specilalization indux as a method of analyzing trade structure.
콘크리트구조물에 발생한 비구조균열의 원인분석을 위한 진단기법의 개발과 활용사례
신홍철 ( Shin Hong-chol ),우영제 ( Woo Young-je ),박유신 ( Park You-shin ),한장현 ( Han Jang-hyun ),한영철 ( Han Young-chul ),권영진 ( Kwon Young-jin ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
There is a crack appearing on the concrete structure from one made and that exert a bad influence on concrete structure. These cracks are variable, causes more than 3 are acting compositively as you see, crack occupy a important position, from the flank of maintance refair, of concrete structure, recently though a sefety diagnosis on the crack of concrete structure is acting briskly, for that reason, most cases are only pat emphasis on the process of a sefety diagnosis of structural crack. In this study, therefore, we propose an analysis method of none-structural crack appearing on the concrete structure from the flank of mix proportion and material, and it is an aim to examine the point at issue of the test.
Poly(ethylene glycol) 곁사슬을 가진 투습 방수 수분산 폴리우레탄의 구조와 물성
서백범(Baek Beom Seo),한영철(Young Chul Han),양정한(Jeong Han Yang),전재우(Jae Woo Jeon),정한모(Han Mo Jeong) 한국고분자학회 2018 폴리머 Vol.42 No.3
Poly(ethylene glycol)(PEG) 사슬 말단에 두 개의 히드록실기를 가져 폴리우레탄 반응에 참여할 수 있는 PEG macromer를 합성하고, 이를 사용하여 PEG 곁사슬이 부착된 투습 방수 코팅용 수분산 폴리우레탄을 제조하고 평가하였다. 즉, poly(tetramethylene glycol) 세그먼트 중 일부를 PEG macromer로 교체하여 투습도와 방수능의 변화, 그리고 열적, 기계적, 물리적 성질의 변화를 조사하였다. 그리고 사슬연장제로 사용된 에틸렌디아민의 일부를 친수성을 가지면서 멜라민계 후가교제와 반응하여 가교를 형성할 수 있는 디메틸올프로판산으로 대체함에 따른 물성의 변화도 조사하였다. 또한 수분산 폴리우레탄에 연한 촉감을 부여하기 위하여, 디이소시아네이트 성분인 4,4-methylenebis(isocyanatocyclohexane) 중 일부를 m-tetramethylxylylene diisocyanate로 교체하는 경우 수반되는 여러 가지 물성의 변화도 조사하였다. A poly(ethylene glycol) (PEG) macromer with two hydroxyl groups at one chain end and capable of participating in the polyurethane reaction was synthesized. This PEG macromer was used to prepare waterborne polyurethanes (WPU) with PEG side chains for waterproof breathable coatings. The effect of this PEG macromer on water vapor permeability, water resistance, thermal, mechanical, and physical properties of the WPU was evaluated. In addition, a change in properties was investigated by substituting a part of ethylenediamine used as a chain extender with dimethylol propanoic acid, which is hydrophilic and can be crosslinked by reacting with a melamine type crosslinking agent. Further, in order to improve the soft touch of the WPU, 4,4-methylenebis(isocyanatocyclohexane), which is a diisocyanate component, was replaced by m-tetramethylxylylene diisocyanate, and the changes of properties were investigated.
이광재(Lee Guang-Jae),한영철(Young-Chul Han),노재관(Jae-Gwan Roh),강보구(Bo-Ku Kang),김태일(Tae-Il Kim),김진한(Jin-Han Kim) 한국생물환경조절학회 2006 한국생물환경조절학회 학술발표논문집 Vol.15 No.2
This research was conducted to investigate the effects of fertigated selenium concentrations on growth and fruit quality of tomato soil culture. Tomato fruit weight per plant is the highest in control as of 2,615 g per plant, and is the lowest in Se 5 ppm treatment. Fruit firmness and soluble solid were increased with increasing selenium concentration in fertigated water. Selenium content in tomato fruit was rapidly increased by increasing Se concentration in ferigated water. Se contents of control, Se 1 ppm, Se 3 ppm, and Se 5 ppm in tomato fruit were 5,37.5, 80.5, and 221.6 ㎍ㆍ100?¹ F.W., respectively.