• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
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• pp.143-150
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• 1999

Elastic wave propagation in a multilayered elastic half-plane is studied by using the Cagniard-de Hoop method. After the unknowns are expressed in terms of the reflection and transmission coefficients in the in terms of the reflection and transmission coefficients in the integral-transformed domains they are assmbled to form the global matrix equation. The inverse Laplace transform of each term is done by applying the Cagniard-de Hoop methods. As a numerical example a four-layered half-plane is considered where a point source is applied to the first layer. The method described in the present study can be used in checking other numerical methods such as FDM.

• 한국시스템다이내믹스연구
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• 제10권2호
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• pp.81-102
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• 2009

Based on various employment and technology data in the cultural sector from the mid-1990s to the mid-2000s in Seoul, Korea, this research examines whether technology- and human resource-oriented programs exert significant impact on creative manpower, R&D technology level and tolerance. After briefly introducing Seoul's trends in the culture industry, it tries to explain major reinforcing and balancing loops. The stock-flow diagram of the culture industry in Seoul is applied to estimate relative effectiveness of technology- and human resource-oriented cultural programs cultural programs. Judging from a series of simulated experiments, technology-oriented cultural programs are essential to increase creative manpower and R&D technology level in the short term. For the first half of research period, this research finds that human resource-oriented cultural programs put forth minimal impact, if they even exist at all. The trends, however, are reversed in the long term: Both size of creative manpower and R&D technology level absolutely depend on human resource-oriented cultural programs in the second half.

• 한국컴퓨터정보학회논문지
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• 제3권3호
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• pp.99-106
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• 1998

본 논문에서는 탐색영역 제한방식과 스케일링 방식을 이용하여 프랙탈 부호화시에걸리는 시간을 줄이는 방법으로서 영상통신을 위한 새로운 프랙탈 부호화 기법을 제안한다.먼저, 원영상을 스케일링 방식을 이용해 이분의 일과 사분의 일의 크기를 가지는 영상으로축소한다. 이어서, 이분의 일의 크기를 가지는 레인지 블럭들 중에 사분의 일의 크기를 가지는 도메인 블럭과 가장 유사한 블럭을 탐색영역 제한방식을 이용해 검색하게 된다. 실험 결과, 제안된 알고리즘은 Jacquin의 방법에 비해 복원된 영상의 화질은 약간 떨어졌으나, 압축율이 향상되고 부호화 시간을 크게 감소시킬 수 있었다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권6호
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• pp.834-840
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• 2008

We carried out fatigue testing with materials of aluminum alloyC7075-T6, 2024-T4) by rotary bending fatigue tester. We investigated fatigue limit, fatigue crack initiation, fatigue crack propagation behavior and possibility of fatigue life prediction to the different small circular hole defect. The summarized result are as follows; Fatigue limit of the smooth specimens were related tensile strength and yield strength. In case of more large applied stress and small circular hole crack defect, the fatigue crack was grown rapidly. The fatigue crack propagation behavior proceed at according to inclusion. Fatigue crack propagation ratio appeared instability and retardation phenomenon in the first half of fatigue life but appeared stability and replied in the latter half. On other hand, this experimental data of the materials are appeared fatigue life predictability.

• 농업과학연구
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• 제15권2호
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• pp.181-191
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• 1988

This paper aims to identify the farmers decision making under uncertainty. Qiuite a few studies have been done on the farmers decision making without uncertainty, but few studies have been made to see farmers decision making under uncertainty in Korea. There are many ways to avoid risks or uncertainty, Wald, Savage, Hurwicz, Laplace, Agrawl-Heady etc. are studied in this field. Fourty farmers were selected as samples. Among those half are the suburbs, and the other half are rural farmers. The results of this study are summarized as follows; First, the suburb farmers are more profit pursuit farmers. Second, not only the rural farmers but the suburb farmers are concerned more safety rather than output maximization. Third, the subsistence farmers and semi-commercial farmers are decided by Wald criterion, but the commercial farmers are decided by Savage or Laplace criterion. Fourth, information is very important in farmers decision making, but the creditability is far from satisfactory to the farmers.

• 한국컴퓨터정보학회논문지
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• 제5권3호
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• pp.64-69
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• 2000

본 논문은 고속 및 고압축을 위한 프랙탈 영상 부호화 기법에 대해서 제안한다. 먼저, 원영상의 크기를 스케일링 방식 및 비트플레인 이용하여 1/2 및 1/4로 축소한다. 이어서, 부호화 시간의 단축을 위해 제한된 영역내에서 원영상의 1/4 크기의 도메인 블록과 가장 유사한 블록을 원영상의 1/2 크기를 가지는 레인지 영역에서 찾는다. 실험 결과, 제안된 알고리즘은 재퀸의 방식에 비해 화질은 다소 저하되었으나, 부호화 시간과 압축율은 많이 향상되었다.

• 한국의류학회지
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• 제21권2호
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• pp.292-301
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• 1997

The purpose of this study was to consider the bodyshape factor of adult women according to their age groups. Age groups were 20's, the first half of 30's, the last half of 30's, 40's, 50's. Factor analysis was performed and bodyshape factors were abstracted at sight of front and side line of the body. Results indicate that the bodyshape factors were different to each age groups, so, age is very important component to the change of body shape of adult women. A suggestion is when they make standard sizes of women's ready-made clothes, it is important to reflect thier characteristics of body shape according to each age groups and age can be a standard to classify the body types of adult women.

• 복식
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• 제48권
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• pp.71-82
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• 1999

The purpose of this study is to examine Sibok of king and prince in Choson dynasty. In the first half of Choson the official uniform was not established. Sibok was worn for expediency. so there is a difference between Shillok and Gukzooraeyi Sibok in Shillok but Sangbok Chobok, Myounbok in Gukzooraeyi as the costume of same ceremony. But we can recognize that king 'Sibok' in that process took the place of Gongbok of Korea dynasty and was beyond simple working uniform though it was degraded than Gongbok Chobok, Myounbok. In the latter half of Choson the number of appearance of Sibok in Shillok was largely decreased in addition to is in interpretation of Sibok it was regarded as Sangbok Especially prince Sibok in a coming-of-age ceremony was regarded as an ordinary dress.

• Nonlinear Functional Analysis and Applications
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• 제28권3호
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• pp.831-850
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• 2023

Our long-standing Metatheorem in Ordered Fixed Point Theory is applied to some well-known order theoretic fixed point theorems. In the first half of this article, we introduce extended versions of the Zermelo fixed point theorem, Zorn's lemma, and the Caristi fixed point theorem based on the Brøndsted-Jachymski principle and our 2023 Metatheorem. We show some of their applications to other fixed point theorems or theorems on the existence of maximal elements in partially ordered sets. In the second half, we collect and improve order theoretic fixed point theorems in the collection of Howard-Rubin in 1991 and others. In fact, we improve or extend several ordering principles or fixed point theorems due to Brézis-Browder, Brøndsted, Knaster-Tarski, Tarski-Kantorovitch, Turinici, Granas-Horvath, Jachymski, and others.

• 대한환경공학회지
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• 제30권12호
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• pp.1255-1261
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• 2008

생물활성탄(BAC) 재질별 EBCT 및 수온변화에 따른 HAA 5종의 생물분해 특성을 조사한 결과 다음과 같은 결론을 얻을 수 있었다. 본 연구에서 BAC에서 HAA 제거시 EBCT와 수온이 매우 큰 영향을 미치는 것으로 나타났다. EBCT와 수온을 증가시킬 경우 HAA의 제거율이 상승하였으며, 수온이 20$^{\circ}C$ 보다 높을 경우 HAA의 제거능은 EBCT의 영향을 크게 받지 않는 것으로 나타났다. 하지만 수온이 5$\sim$10$^{\circ}C$ 정도로 낮을 경우는 EBCT의 증가가 HAA의 제거율에 큰 영향을 미치는 것으로 나타났다. 활성탄 재질에 따른 BAC에서의 HAA 제거는 석탄계 재질에서의 생물분해능이 가장 높았고, 다음으로 야자계, 목탄계 순으로 조사되었다. HAA 5종에 대한 생물분해 속도상수와 반감기는 수온이 5$^{\circ}C$일 때의 HAA 5종에 대한 생물분해 속도상수(k)와 반감기(t$_{1/2}$)는 0.0373$\sim$0.1175 min$^{-1}$, 반감기는 5.9$\sim$18.58분이었으며, 수온을 10$^{\circ}C$와 20$^{\circ}C$로 증가시켰을 때 5$^{\circ}C$일 때와 반감기를 비교해 보면 1.5$\sim$7.9배로 감소되었다.