• 대한수학회지
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• 제45권5호
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• pp.1275-1295
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• 2008

In this paper, we consider an impulsive nonlinear second order ordinary differential equation with nonlinear three-point boundary conditions and develop a monotone iteration scheme by relaxing the convexity assumption on the function involved in the differential equation and the concavity assumption on nonlinearities in the boundary conditions. In fact, we obtain monotone sequences of iterates (approximate solutions) converging quadratically to the unique solution of the impulsive three-point boundary value problem.

• Korean Journal of Mathematics
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• 제22권4호
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• pp.633-644
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• 2014

We get one theorem that there exists a unique solution for the fourth order semilinear elliptic Dirichlet boundary value problem when the number 0 and the coefficient of the semilinear part belong to the same open interval made by two successive eigenvalues of the fourth order elliptic eigenvalue problem. We prove this result by the contraction mapping principle. We also get another theorem that there exist at least two solutions when there exist n eigenvalues of the fourth order elliptic eigenvalue problem between the coefficient of the semilinear part and the number 0. We prove this result by the critical point theory and the variation of linking method.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.115-120
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• 2002

The rigid body properties of a structure may be estimated easily if the mass-line of the structure could be taken exactly. However, the exact mass-line may be hard to be obtained exactly in experiments. The mass line value can be read from the mass line in frequency response function. However, the mass lines in the frequency response function sometimes show the fluctuation with frequency, and it cannot be read correctly. In this paper, the wavelet transform is applied to obtain the good mass line value. The mass line calculated by using wavelet transform has unique value and showed in the range of fluctuated values of frequency response function. The rigid body properties obtained by wavelet transform also showed better results than those by fourier transform.

• 한국소음진동공학회논문집
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• 제12권9호
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• pp.725-730
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• 2002

The rigid body properties of a structure may be estimated easily if the mass-line of the structure could be taken exactly. However, the exact mass-line nay be hard to be obtained exactly in experiments. The mass line value can be read from the mass line in frequency response function. However, the mass lines in the frequency response function sometimes show the fluctuation with frequency, and it cannot be read correctly. In this paper, the wavelet transform is applied to obtain the good mass line value. The mass line calculated by using wavelet transform has unique value and showed in the range of fluctuated values of frequency response function. The rigid body properties obtained by wavelet transform also showed better results than those by fourier transform.

• 한국의류학회지
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• 제15권4호
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• pp.437-445
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• 1991

The effect of diameter of rods or fibers on contact angle was studied in a vertical rod configuration. A contact angle measuring device described in the previous paper was optimized for the measurement of small-diameter fibers. It was shown that contact angles of water and hexadecane on nylon 6 monofilsments and glass rods increased with decrease of diameter below a critical diameter, which varied from one system to another. Beyond the critical value, contact angle of the liquid on the vertical glass rod reached to an equilibrium value which is equal to the unique value of the contact angle of the liquid drop on the horizontal glass plate.

• Advances in Computational Design
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• 제9권1호
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• pp.73-80
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• 2024

The aim of this paper is to remove the rigid body motion in the interior boundary value problem (BVP) of plane elasticity by solving the interior and exterior BVPs simultaneously. First, we formulate the interior and exterior BVPs simultaneously. The tractions applied on the contour in two problems are the same. After adding and subtracting the two boundary integral equations (BIEs), we will obtain a couple of BIEs. In the coupled BIEs, the properties of relevant integral operators are modified, and those integral operators are generally invertible. Finally, a unique solution for boundary displacement of interior region can be obtained.

• 디지털융복합연구
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• 제14권9호
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• pp.123-132
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• 2016

본 연구는 "어떤 기업이 거래 상대로서 매력적이지 않음에도 불구하고, 단지 오랜 기간 거래를 했다는 이유로 관계를 지속하는 원인이 무엇일까?" 라는 연구 문제로 출발하였다. 저자들은 이를 고객 가치로 설명하였으며, 고객 가치를 B2B 거래 관계의 스펙트럼 안에서 거래 가치, 관계 가치, 평가적 가치라는 세 가지 유형으로 구분하여, 거래 지속의도에 미치는 영향에 대해 실증분석을 실시하였다. 그 결과, 기업 간 거래를 유지하는데 있어, 거래 가치 혹은 관계 가치라는 양자택일적인 가치 판단이 이루어지는 것이 아니라, 거래를 지속할 것인지 말 것인지에 관한 의사결정은 거래 가치와 관계 가치를 토대로 평가적인 측면에서 이루어진다는 것을 알 수 있었다. 즉, 기존 연구가 거래 가치 혹은 관계 가치라는 한 측면에서 거래의 지속성을 다루었다면, 본 연구는 이들을 동시에 고려하였다는 점에서 그 의의를 갖는다고 할 수 있다.

• 한국인터넷방송통신학회논문지
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• 제17권4호
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• pp.155-161
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• 2017

본 논문은 지금까지 NP-완전 문제로 다항시간 알고리즘이 존재하지 않는 스도쿠 퍼즐 문제의 해를 다항시간으로 구하는 알고리즘을 제안하였다. 제안된 알고리즘은 빈칸들에 [$1,2,{\cdots},9$] 중에서 행, 열과 블록에 존재하는 실마리 숫자를 제외한 후보 집합을 초기치로 설정하였다. 빈칸의 후보 집합에 대해 Stuart이 제시한 기본적인 규칙들과 더불어 2개의 추가 규칙을 제시하고, 마지막으로 이진 역추적 기법(BBT)을 적용하였다. 다양한 부류의 해를 갖는 실험데이터들에 대해 적용한 결과 제안된 BBT 알고리즘은 어떠한 부류의 해를 갖던지에 상관없이 주어진 스도쿠 퍼즐을 풀 수 있음을 보였다.

• 동아시아식생활학회지
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• 제17권6호
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• pp.919-925
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• 2007

The purpose of this study was to investigate the influence of customers' perceived risks on their perception of value at family restaurants in Seoul. Frequency analysis, reliability analysis, factor analysis, multiple-regression analysis were employed to analyze the data. The customers' perceived risk were divided into 6 factors. Three of the perceived risk factors(financial, time, performance risk) negatively(-) influenced the perception of value. In particular, 'financial risk' was the most negative. However, 3 factors(physical risk, psychological risk, social risk) didn't have significant influence on perceived risk. As a result, customers of family restaurants appear to perceive various risks, and these risks have significant impacts on their perception of value. Therefore, food-service corporations need to reduce customers' perceived risks, possibly by various and efficient pricing-policies, discount, price-bundling, using coupon, effective physical evidence and offering unique compensation.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.245-248
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• 2005

It should be noted that the critical chloride threshold level is not considered to be a unique value for all conditions. This value is dependent on concrete mixture proportions, cement type and constituents, presence of admixtures, environmental factors, steel reinforcement surface. conditions, and other factors. In this study, the accelerated corrosion test for reinforcing steel was conducted by electrochemical and cyclic wet and dry seawater method, respectively and during the test, corrosion monitoring by half cell potential method was carried out to estimate the chloride corrosion threshold value when corrosion for reinforcing steel in concrete was perceived. For this purpose, lollypop and right hexahedron test specimens were made for 31.4$\%$, 41.5$\%$ and 49.7$\%$ of w/c, respectively and then the accelerated corrosion test for reinforcing steel was executed. It was observed from the test that the time to initiation of corrosion was found to be different with water-cement ratio and accelerated corrosion test method, respectively and the chloride corrosion threshold value was found to range from 0.91 to 1.43 kg/$m^{3}$.