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류덕환,조지현 啓明大學校 生活科學硏究所 2002 科學論集 Vol.- No.-
The purpose of this study was to evaluate of subjective handle by consumers in waterproof and water vapor permeable coated fabrics. The survey was conducted by means of the sensory test during Jan. 15 to Mar. 15, 1999. Total 4032 data were collected including male, female, no major, and major people who are studying clothing and textile in college. Handle were observed by subjective method as the washing was repeated for 4 kinds of material which have different water vapor transmission, and the change of water vapor transmission each others. The data were analysed for t-test, ANOVA, factor analysis, and Duncan multiple test. Consumers evaluated that water and water vapor permeable coated fabrics were less elasticity. There were little difference in wrinkles, thickness, and luster for polar adjective words. Clearer evaluation was shown by female group or major group than others. The results of factor analyses for 18 polar adjective words on subjective handle test yielded 4 factors, that were 'elastic property', 'surface property', 'thickness and weight property' and 'thermal and rigid property'. The surface properties were deteriorated remarkably as washing was repeated and significant difference were observed. Significant differences of subjective handle in 4 factors were shown in fabric types.
盧德煥 군산대학교 1985 論文集 Vol.10 No.-
In this dissertation, it was shown how the dominance principle could be used to delineate desirable assets.Then various diversification practices were reviewed.It was seen that diversification of even the most naive vairety was beneficial in reducing risk and thereby increasing the portfolio's average rate of return in the long run.Markowitz diversification was seen to be the most effective way of attaining these risk-reducing benefits. After derivation of the efficient frontier was explained in terms of Markowitz diversification, borrowing and lending opportunities were introduced.It was seen that the dominant assets were always portfolios and usually involved lending or leverage.Thus, we reach the conclusion that diversification is essential to the investment program of a rational, risk-averse, wealth-seeking investor.Furthermore, Markowitz diversification helps the investor attain a higher level of expected utility than any other technique.Thus, rational investors will be concerned with the correlation between assets in addition to the assets' expected returns and standard deviations, After investors somehow delineate the most dominant investment opportunities to be found, they still must select one in which to invest their funds. Essentially, once the efficient frontier is delineated, portfolio selection is a personal choice.
김덕환,이교영,이경갑,최희인,오사메 사토시,이찌조 시게루 충남대학교 수의과대학 동물의과학연구소 1994 動物醫科學硏究誌 Vol.1 No.-
In prder to clarify the changes of serum chemical values(AST, CPK and LDH activities)and LDH isoenzyme fractions in frequent occuring some diseases of dairy cows, total 48 cows(40 patients: 18 with downer cow syndrome, 17 with abomasal displacement and 5 with acute mastitis and 8 controls: clinically healthy cows) were examined. The results obtained were as follows: 1. In changes of total serum enzyme activities of patients group, increase of serum AST(P<0.001), CPK(P<0.01) and LDH activities(P<0.01)were observed in groups of downer cow syndrome and abomasal displacement, respectively by comparison with control group. Increase of AST only was found in group of acute mastitis(P<0.05). 2. In LDH isoenzyme fractions, increase of LDH₁(P<0.01), LDH₂(P<0.05), LDH₃(P<0.01), LDH₄(P<0.01) and LDH_5(P<0.01)fractiona was observed in group of downer cow syndrome and also marker increase of LDH4 and LDH5 fractions was noted in this group. The increase of LDH₁, LDH₂ amd LDH₃ (P<0.01)fractions was found in group of abomasal displacement, but group of acute mastitis showed similar result to that of control group.
柳德桓,石美子 啓明大學校生活科學硏究所 1992 科學論集 Vol.18 No.-
Al-sash bar pile textile PP filament, and PE were blended with various blending ratios. The materials got from this process were drawed by varying draw temperature and draw ratio. The changes in each draw materials crystallinity and degree of orientation were records. Then, the changes in their machanical properties such as initial modulus, tensile strength, and elongation were observed. The physical properties of each material were compared with each other. The results of this experiment are as follows: 1. As PE blend ratio increased, crystallinity, degree of orientation, and initial modulus increased but elongation decreased. Especially, modulus showed maximum value when PP-PE ratio was 80:20(%). 2. In the observation according to various draw ratio, as draw ratio increased, crystallinity, degree of orientation, tensile strength, and modulus increased but elongation decreased. Elongation reached almost saturation point at 3-3.5 of draw ratio. 3. No characteristic of change in fine structure and physical properties according to the variation of draw temperature was found. Thus, it was found that 95℃ was the best working condition. 4. The tensile strength and the initial modulus according to the increasement of crystallinity and degree of orientation showed the tendency of nearly linear proportion. 5. It appeared that, in the observation of crystallinity, the outcomes from Segals method, Turlys method, and Area method by X-ray diffraction were nearly the same.
盧德煥 군산대학교 1988 論文集 Vol.15 No.-
1.Introduction Lately security investment trust is prevailing in Korea, so it is very useful to measure the portfolio performance of investment trust in Korea.For this study I selected 65 stock - typed investment trust funds and utilized several models of Sharpe, Treynor, Jensen and Fama.This paper purports not only to help our fund managers to construct and manage the security investment trust portfolio but also to help our policy - maker to control the investment trust companies. 2.Modeling and Sampling For this test, I selected 65 stock-typed investment trust funds and utilized 4 models as follows Model 1 ; Sharpe's index ; *****(p.436) Model 2 ; Treynor's index ; ***** Model 3 ; Jensen's α ; (RP-RF)-(RM-RF)·βP Model 4 ; Fama's NS ; RP-[RF+(RM-RF)·βT] and time span of each data(RP, RM, RF)is one month from Jan.1980 to Dec.1987. 3.Conclusions In this paper I found the following results : (1)Our fund managers had not outperformed more than the overall stock market because of their lack of forecasting abilities. (2)The systematic risk of investment trust is not changed according to market conditions. (3)The rank correlation of performance measurement of investment trust is objectively appropriate. (4)The performance difference among investment trusts does not exist.