• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 2001년도 추계학술대회
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• pp.44-44
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• 2001

• 대한수학회논문집
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• 제26권4호
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• pp.669-684
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• 2011

In this note, we obtain the expression of the characteristic fucntion of the random variable $\int_o^TB_s^{{\alpha},{\beta}}dB_s^{H,K}$, where $B^{{\alpha},{\beta}}$ and $B^{H,K}$ are two independent bifractional Brownian motions with indices ${\alpha}{\in}(0,1),{\beta}{\in}(0, 1]$ and $HK{\in}(\frac{1}{2},\;1)$ respectively.

• 호남수학학술지
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• 제29권4호
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• pp.511-521
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• 2007

Let S($z_1$, $z_2$) be a power series with operator coefficients such that multiplication by 5($z_1$, $z_2$) is a contractive transformation in the Hilbert space $\mathbf{H}_2$($\mathbb{D}^2$, C). In this paper we show that there exists a Hilbert space D($\mathbb{D}$,$\bar{S}$) which is the state space of extended canonical linear system with a transfer fucntion $\bar{S}$(z).

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.12-22
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• 2007

This paper presents to predict the powertrain structure-borne noise which is primary resource of interior noise. As the first step, it is built up a hybrid powertrain model which is based on the real powertrain which is verified with static and dynamic properties. The methods for verifying are modal analysis and running vibration testing which are experimentally implemented. Based on the Hybrid powertrain component model, an initial predictive assembly model is simulated. As the second step, the characteristic transfer functions are measured that are dynamic stiffness of rubber mounts and vibro-acoustic transfer function based on the acoustic reciprocity. Several techniques utilizing special experimental devices have been proposed for this research. Finally, the structure-borne noise by powertrain will be predict and verify with dynamic simulation and experiment.

• 한국학교ㆍ지역보건교육학회지
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• 제14권3호
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• pp.51-65
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• 2013

Objectives: The main purpose of this study was to compare influencing factors on depression between male and female students at the high school. Methods: The self-administered questionnaire survey was carried out on a convenience sample of 403 high school students. The data analysis procedure included frequency, ${\chi}^2$ test, t-test, ANOVA, Pearson correlation coefficients, and stepwise multiple regression using depression as the dependent variable. Results: There was a significant gender difference in depressive symptoms; the mean depression score of female students was higher than that of male students. Stepwise multiple regression analysis for depression revealed that the most powerful predictors (34%) were powerlessness and self-esteem for male students. On the other hand, the factors such as self-esteem, mother's occupation, and family fucntion were the most significant predictors (50%) for female students. Conclusion: The necessity of an intervention considering gender difference in high school students so as to prevent the occurrence of depression was suggested.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2011년도 정기 학술대회
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• pp.88-89
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• 2011

풍하중이 작용하는 교량의 응답을 구하기 위하여 RFA(Rational Function Approximation)와 같은 시간 영역해석법이 널리 사용되고 있다. 교량 단면의 공기역학적 특성을 정의하는 플러터 계수는 주파수 영역에서 정의되기 때문에, 시간 영역해석을 위하여 inverse Fourier transform을 통해 얻어진 impulse response function을 이용한 중첩 적분법이 제안되었다. 시간 영역해석을 위해서는 플러터 계수에 상관성이 존재해야 함을 밝히고, 최적화 방법을 이용하여 시간 영역 해석을 위한 플러터 계수 산정법을 제안하고자 한다. B/D=20의 구형 단면에 적용하여 제안한 방법의 타당성을 검증하고자 한다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.256-259
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• 1999

The purpose of this study is to develop the material for multiayer piezoelectric ceramic transformer because multiayer piezoelectric transformer must need low sintering temperature. So that PMN-PSN-PZT family ceramics were added with glass brit(SiO$_2$ $.$ PbO). The dielectric and piezoelectric properties were increased with increasing it until the amounts of additive 0.8wt%. Sintering temperature were low about 100[$^{\circ}C$]. Accordingly, This material could be used to multiayer piezoelectric transformer .

• 동아시아식생활학회지
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• 제8권2호
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• pp.107-115
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• 1998

This study was conducted to investigate the effects of dietary fibers (cellulose ; polydextrose ; pectin ; ricebran) supplementation on the kidney fucntion of hyperlipidemic-induced rats on a high cholesterol diet (5% cholesterol). Serum lipid concentrations were not influenced by dietary fiber sources, but the pectin group was effective in reducing serum lipid levels. Total serum protein and albumin concentrations tended to higher in the polydextrose group, and serum creatinine and urea-N concentrations were higher in the pectin group than those in the other groups. Even though total urinary protein was high in the pectin group, GFR was reduced (18~30% decrease) as compared to other groups. The urea-N level was elevated in the polydextrose group as compared to that of cellulose group(25% increase). Total lipid, triglyceride and cholesterol concentrations in the liver of pectin group were lower than those of other groups. Total lipid and cholesterol concentrations in the kidneys were reduced in pectin and ricebran groups, respectively. The total cholesterol concentration infecal was significantly high in the polydextrose and pectin groups(p<0.05), and the triglyceride was highest in the pectin group. These results indicate no significant effects of dietary fiber supplementation on the kidney function of hyperlipidemic-induced rats on a high cholesterol diet, but pectin was very effective to improve lipid metabolism and to reduce GFR.

• 한국통신학회논문지
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• 제23권5호
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• pp.1208-1221
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• 1998

본 논문에서는 ATM 망에서 ABR 서비스를 제공하기 위하여 ATM 포럼에서 표준화를 진행하고 있는 망 종단간 흐름제어 기능을 설계하기 위한 제반 고려 사항들을 살펴보고 구현을 위한 설계 고조를 제시한다. 제시한 설계 구조에서는 구현의 용이성과 제어 변수의 효율적인 가변을 위하여 제어 파라미터를 계산 및 조정하고 자원 관리 셀을 처리하는 부분은 소프트웨어로, 실제 셀을 허용된 속도로 송출하는 부분은 하드웨어로 구현하여 실시간으로 송출 트래픽의 흐름 제어가 가능하도록 하였다. 제안한 설계 구조는 추후 표준화의 진행으로 인한 제어 파라미터의 산출 방식 및 적용 방법의 변경에도 쉽게 대처할 수 있고 실시간으로 제어하는 구조가 단순하여 구현 비용을 절감할 수 있는 구조로서 추후 구축될 ATM 망에서 ABR 서비스를 제공하는데 기여할 수 있을 것으로 개대된다.

• 가정과삶의질연구
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• 제10권2호
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• pp.51-59
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• 1992

Previous studies indicated that unmarried persons are subject to higher mortality than the married, and that the differentials are more marked for male than for females. There are two major approaches to explaining the marital status differentials in mortality ; selection function and protection function of marriage. Following protection fucntion, this study develops the new "instrumental / expressive sex-role" hypothesis in order to explain why marriage protects males more against death. The hypothesis expects that male's instrumental role and female's expressive role have direct effect as well as indirect effect through social integration on sex differential mortality by marital status. for the hypothesis testing, Korea and US vital statistics and census data are used to compute age-specific , age-adjusted mortality rates and their ratios for persons in different marital status. Major findings are as follows. 1)For both Korea and US being married is more advantageous to males than females, ad being widowed, divorced, and separated is more disadvantageous to males, while being never-married is more disadvantageous to females, 2) For Korea, the never married men and women have the highest mortality rates, 3) For US the never married women have the highest mortality rate, while the divorced, separated, and widowed men have the highest mortality rate. Fro both Korea and US data, selection function is rejected, but instrumental/expressive sex-role hypothesis succeeds in accounting for the sex and marital status differential in mortality.