• Journal of applied mathematics & informatics
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• 제5권1호
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• pp.269-275
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• 1998

We find the Hibert functions of basic configurations in $P^n$. In particular we obtain the minimal generators of the ideal of a weak-k-configuration in $P^n$.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.973-976
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• 2009

디지털 신호처리 기술은 통신을 비롯한 다양한 분야에서 이용되고 있으며, 이러한 신호처리를 위해 사용되는 대표적인 필터에는 FIR 디지털 필터가 있다. 그리고 FIR 디지털 필터를 설계함에 있어서, 이상적인 필터에 대한 계수 절단 과정에서 발생하는 깁스현상(Gibbs phenomenon)을 감소시키기 위해, 창함수를 사용한다. 따라서, 본 논문에서는 디지털 필터의 성능을 향상시키기 위해, 고차의 창함수를 적용하였으며, 시뮬레이션에서 최대부엽의 크기와 천이 특성을 이용하여 기존의 창함수와 비교하였다.

• 정보보호학회논문지
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• 제17권4호
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• pp.47-52
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• 2007

본 논문에서는 파이프 해쉬 함수를 가진 동적 파이프 해쉬 함수를 제안한다. 안전도를 높이기 위하여, 압축함수를 추가하여 파이프 기반 동적 해쉬 함수를 제안하였다. 제안한 동적 파이프 해쉬 함수는 다중충돌공격에 안전하고 압축 사이즈를 가변할 수 있기 때문에 많은 장점을 가지고 있다. 예를 들어, 디지털 서명 프로토콜에서 사용자가 보다 큰 키 사이즈를 선택하여 높은 안전도를 요구한다면, 동적 해쉬 함수를 사용하여 압축사이즈를 증가시켜 쉽게 실현할 수 있다.

• 한국의류학회지
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• 제22권1호
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• pp.29-40
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• 1998

This study is to develope positioning strategy of fashion underwear market through the perceptual map which can analyze the psychological positioning of the existing fashion underwear brand. A positive study has been made on 176 women in their teens and twenties who live in the Seoul area through questionaire. The collected data was analyzed with Multidimensional Scaling Method, Conjoint Analysis and Cluster Analysis and so on. The results of analyzing the competitive relationships for attributes and the ideal points are as follows: The consumers groups are divided into three market segments on the basis of the ideal points about fashion underwear attributes. $\ulcorner$calvin Klein$\lrcorner$ evaluated excellent in design and color, brand and function attributes, and also appealed well to the segment market 2. $\ulcorner$calvin Klein$\lrcorner$ has good positioning at the fashion underwear market, and as well as the possibility of growth. $\ulcorner$Body Guard$\lrcorner$ appealed well in segment market 1 which highly valued the material and price attributes and $\ulcorner$Body Guard$\lrcorner$ competes with $\ulcorner$Benetton Undercolor$\lrcorner$ in this market. $\ulcorner$Hunt Innerwear$\lrcorner$ has possibilitiy to be appealed in segment market 3. Finally, it is necessary for each fashion underwear company to analyze and develope the segment market 3. Each company has to develope the brand that can appeal in the segment market 3 in which function was highly valued, and has better to make strategies that develope more functional products like sports underwear, bodysuit and bodywear and so on.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권4호
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• pp.1760-1778
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• 2018

For image segmentation with intensity inhomogeneity, many region-based level set methods have been proposed. Some of them however can't get the relatively ideal segmentation results under the severe intensity inhomogeneity and weak edges, and without use of the image gradient information. To improve that, we propose a new level set method combined with local direction gradient in this paper. Firstly, based on two assumptions on intensity inhomogeneity to images, the relationships between segmentation objects and image gradients to local minimum and maximum around a pixel are presented, from which a new pixel classification method based on weight of Euclidian distance is introduced. Secondly, to implement the model, variational level set method combined with image spatial neighborhood information is used, which enhances the anti-noise capacity of the proposed gradient information based model. Thirdly, a new diffusion process with an edge indicator function is incorporated into the level set function to classify the pixels in homogeneous regions of the same segmentation object, and also to make the proposed method more insensitive to initial contours and stable numerical implementation. To verify our proposed method, different testing images including synthetic images, magnetic resonance imaging (MRI) and real-world images are introduced. The image segmentation results demonstrate that our method can deal with the relatively severe intensity inhomogeneity and obtain the comparatively ideal segmentation results efficiently.

• 대한기계학회논문집
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• 제14권1호
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• pp.172-178
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• 1990

본 연구에서는 스터링기관의 예비설계에 편리하게 적용될 수 있는 경제적이며 타당한 해석방법을 확립하기 위하여, Urieli등에 의하여 정립된 이상적인 단열모델에 대하여 해석적 근사해를 구하고자 한다.이미 발표된 연구에서는 근사해를 얻기 위 해 피스턴운동을 가장 간단한 톱날파로 가정한 바 있으나 실제의 정현파형 등과는 현 저한 차이가 있으므로 이를 개선하여 크랭크각도에 대한 임의의 구간선형함수(piecew- ise linear function)로 취급한다. 또한, 해석의 결과로서 결정되는 기관내의 압력 및 각 실린더내의 질량 또는 온도 등 열역학적 변수로부터 기관성능평가를 위한 열 및 일의 계산 과정을 포함한다.

• 가정과삶의질연구
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• 제20권1호
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• pp.45-56
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• 2002

The main purposes of this article are to introduce the theoretical backgrounds and empirical application methods of two different Models for the function of expenditure, and to compare the goodness-o(-fit of the two models: a single-equation model and a complete-system-of-demand-equation model. For the empirical analysis of the single-equation model, a linear formula and a double-leg formula were employed. In order to test the complete-system-of-demand-equation model empirically, the \"Linear Approximation/Almost Ideal Demand System (LA/AIDS)" was used. The independent variables were the total living expense and expenditure categories Price index. The data used in this study were obtained from the quarterly statistics of "The Annual Report on the Urban Family Income and Expenditure Survey (Dosigagyeyonbo)" and "The Annual Report on the Consumer Price Index (Sobijamulgajaryo)," for the years 1994 to 1997. The goodness-of-fit (R-square) was higher with the complete-system-of-demand-equation model than with the single-equation model for the budget share on food (excluding eating-out expenses) and for the share on cultural and recreational activities. However, there was no difference between the two models in terms of the proportion of the expenditure on automobile fuel.fuel.

• 한국통신학회논문지
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• 제23권5호
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• pp.1165-1172
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• 1998

본 논문에서는 다항식 $z^{d}+(z+1)^{d}$를 이용하여 이상적인 자기상관특성을 갖는 주기 $2^{m}-1$의 이진 의사불규칙시퀀스를 구성하는 것을 보였다. 다항식으로부터 얻어진 시퀀스는 어떤 d값에서는 m-시퀀스가된다. 또한 k가 양의 정수이고 m이 $3k{\pm}1$일 때 이상적인 자기상관특성을 갖는 새로운 이진 시퀀스를 산출하는 몇몇의 d값을 발견했다. 이들 새로운 시퀀스는 trace함수를 이용하여 표현하였으며 그 결과들을 표로 나타내었다.

• Journal of applied mathematics & informatics
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• 제28권1_2호
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• pp.311-324
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• 2010

We prove that a regular ordered semigroup S is left simple if and only if every intuitionistic fuzzy left ideal of S is a constant function. We also show that an ordered semigroup S is left (resp. right) regular if and only if for every intuitionistic fuzzy left(resp. right) ideal A = <$\mu_A$, $\gamma_A$> of S we have $\mu_A(a)\;=\;\mu_A(a^2)$, $\gamma_A(a)\;=\;\gamma_A(a^2)$ for every $a\;{\in}\;S$. Further, we characterize some semilattices of ordered semigroups in terms of intuitionistic fuzzy left(resp. right) ideals. In this respect, we prove that an ordered semigroup S is a semilattice of left (resp. right) simple semigroups if and only if for every intuitionistic fuzzy left (resp. right) ideal A = <$\mu_A$, $\gamma_A$> of S we have $\mu_A(a)\;=\;\mu_A(a^2)$, $\gamma_A(a)\;=\;\gamma_A(a^2)$ and $\mu_A(ab)\;=\;\mu_A(ba)$, $\gamma_A(ab)\;=\;\gamma_A(ba)$ for all a, $b\;{\in}\;S$.

• 한국의류산업학회지
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• 제8권5호
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• pp.513-522
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• 2006

The purpose of this study was to analyze characteristics and meanings of the masculine factors related with power images in women's fashion since 2000. The method of study was to analyze the documentary about the power images since the 14th Century and then the fashion magazines since 2000. The results of this study were as follows: The power image of women's fashion was internalized by wearing of the masculine factors each of an era. After 2000, characteristics of women's fashion affected by masculine factors were an exaggeration of scale, deformation, inharmonious collage and changeful borrowing. They showed the structure of new cognition of modern society uncertainty, open and decentralized. And power images presented aesthetic characteristics such as independence, ideal, sign of a amusement and decentralized virility. In conclusion, power in women's fashion has a function of creativeness, product, positiveness from past to modern. In addition, the power, which is a symbol of perfection, rationality and ideal beauty, expresses a good feeling of psychology, social friendship, value of success and will be existed as a meaningful esthetic sign in women's fashion.