• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.567-570
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• 2003

Fractal mathematics is being highlighted as a research method for classification of image. But the application of Fractal dimension(FD) has been required the complicated calculation method because of its complex repetition progressing. In this paper, it has been developed the new approach method to express the Fractal Dimension(FD) for aging level calculation and estimation system of outside insulator using special image processing algorithm. As a result after FD testing, the recognized aging estimation of FD has a very characteristics compared to the conventional visual inspection.

• Journal of the Korean Data and Information Science Society
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• 제20권3호
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• pp.475-483
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• 2009

본 연구에서는 한국종합주가지수 데이터를 이용하여 다양한 비선형 시계열 모형들을 소개하였다. 조건부 평균의 선형 모형으로는 상수항 모형, 자기회귀 모형을 살펴보았으며, 비선형 모형으로는 분계점 자기회귀 모형, 지수적 자기회귀 모형을 살펴보았다. 조건부 분산 모형으로는 일반 자기회귀 이분산 모형과 지수적 일반 자기회귀 이분산 모형, Glosten 등 (1993)의 모형 그리고 일반화 이항멱변환 분계점 일반 자기회귀 이분산 모형을 살펴보았다. 한편, 일반화 이항멱변환 분계점 일반 자기회귀 이분산 모형은 대표적 비대칭성 이분산성 모형인 Zakoian (1993) 모형과 Li와 Li (1996) 모형을 효과적으로 통합할 수 있는 변형된 모형이다. 본 연구에서는, 한국종합주가지수 데이터를 분석하여 새로운 모형의 효율성을 증명하였다.

• 한국통신학회논문지
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• 제38A권9호
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• pp.759-764
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• 2013

$q{\equiv}5$ (mod 8)의 경우에 유한체 $F_q$상에서 Atkin의 제곱근 알고리즘과 $q{\equiv}9$ (mod 16)의 경우에 Kong의 알고리즘으로부터 일반적인 제곱근 알고리즘을 제안한다. 우리의 알고리즘은 s가 $2^s|q-1$을 만족하는 가장 큰 양의 정수라 할 때, $2^s$차 원시근 ${\xi}$를 미리 계산하였고 s의 값이 작을 때 적용가능하다. 제시한 알고리즘은 제곱근을 계산하기 위해 한 번의 지수계산이 필요하고, Akin, M$\ddot{u}$ller, Kong의 알고리즘과 비교해보아도 유리하다.

• 한국초등수학교육학회지
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• 제18권3호
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• pp.519-537
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• 2014

본 연구는 수학 교사들의 교사로서의 자기 효능감을 효과적으로 측정하기 위해, 수학교사의 효능감에 영향을 주는 요소를 문헌 연구를 통하여 추출하고, 효능감 측정을 위한 도구를 개발하는 것이다. 수학교사의 교수효능감에 영향을 미칠 수 있는 요인으로 수학 교수 효능기대, 수학 교수 결과기대, 교수학적 내용 지식, 학생에 대한 교사의 신념, 교사의 과거 수학학습 경험에 대한 신념, 사회문화적 영향에 대한 기대라는 6가지 요소를 도출하였고, 이러한 요인에 기반하여 30문항으로 구성된 수학 교수 효능감 측정 도구(MTEI)를 개발하였다.

• 대한지구과학교육학회지
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• 제3권1호
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• pp.1-8
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• 2010

The purpose of this study was to analysis the 6th students' conceptions of the nature phenomenon focused on the systematic characteristics. For this study, 12 students of the 6th grades participated in special class for testing their conceptions about the water cycle in the earth system. And we analyzed the outcomes of students' conceptions based on SBF conceptual representation. The results indicate that most of the subjects perceived that the water cycle in earth system wasn't complex system maintaining its existence and functions as a whole through the interaction of its parts but simple system maintaining some actions between atmosphere and hydrosphere, geosphere, biosphere(biological world). And they didn't perceive the characteristics of the water cycle whose all parts must be presented the change of volume between vapor and water, glacier proposing the total hydro-volume are established in the earth system. Based on the results, it was suggested that the main goals of the schools' science education should be to provide students who understand the water cycle system as attaching importance to form with the skills needed to coherent understanding of the essential qualities for the nature phenomenon system.

• 한국항해항만학회지
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• 제41권5호
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• pp.287-296
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• 2017

The Formal Safety Assessment (FSA) is a structured and systematic methodology developed by the IMO, aimed at assessing the risk of vessels and recommending the method to control intolerable risks, thereby enhancing maritime safety, including protection of life, health, the marine environment and property, by using risk analysis and cost-benefit assessment. While the FSA has mostly been applied to merchant vessels, it has rarely been applied to a DP vessel, which is one of the special purpose vessels in the offshore industry. Furthermore, most of the FSA has been conducted so far by using the Fault Tree Analysis tool, even though there are many other risk analysis tools. This study carried out the FSA for safe operation of DP vessels by using the Bayesian network, under which conditional probability was examined. This study determined the frequency and severity of DP LOP incidents reported to the IMCA from 2001 to 2010, and obtained the Risk Index by applying the Bayesian network. Then, the Risk Control Options (RCOs) were identified through an expert brainstorming and DP vessel simulations. This study recommends duplication of PRS, regardless of the DP class and PRS type and DP system specific training. Finally, this study verified that the Bayesian network and DP simulator can also serve as an effective tool for FSA implementation.

• 한국정보처리학회논문지
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• 제4권11호
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• pp.2701-2710
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• 1997

재귀원형군은 마이크로 프로세스의 모델로서 활발하게 연구되고 있으며 특히 슈퍼컴퓨팅 분야에서 많은 관심을 불러 일으키고 있다. 본 논문에서는 재귀원형군에서 메시지의 경로 설정을 연구하는데 이는 네트워크의 성능 평가에 중요한 기준이 된다. 재귀원형군에서 출발 노드에서 목적 노드까지 m개의 패킷을 m개의 경로를 따라서 동시에 전송하고자 한다. 이 때 i번째의 패킷은 i번째의 경로를 따라서 전송된다. $(o{\leq}i{\leq}m-1)$. 모든 패킷들이 목적 노드에 신속하고 안전하게 도달하기 위해서 i번째의 경로는 disjoint해야 한다. 이들 경로들을 설계하기 위해서 Hamiltonian Circuit Latin Square(HCLS)를 재귀원형군에 적용시켜서 $O(n^2)$ 병렬 경로 알고리즘을 제안한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.550-553
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• 2004

Recently, the demand for the Floating, Production, Storage, and Offloading facility (FPSO) which has some economic and technical advantages, has increased in offshore oil production areas. The 36,8000 DWT class FPSO was built in Hyundai Heavy Industries and will be installed in Offshore Angola. She dose not have self-propulsion system, but has additional facilities for oil production and positioning system. Main noise sources are contributing to the cabin noise of the accommodation are classified into three classes such as the machinery in the engine room and the deckhouse, HVAC system, and the topside equipments. In general, the noise regulation for the offshore structure is severer than that of the cargo ship and acceptable noise limit of cabin is specified as 45 dB(A). This paper describes the procedure of noise analysis, the countermeasures of noise control, and the measurement results of the quay trial. In order to minimize the noise levels, careful attention have to be paid by the special committee of experts from the initial design stage to the delivery. Proper countermeasures, considering the characteristics of sources and receiver spaces, were applied from the noise prediction and various experiment results. Finally, this ship was successfully delivered with excellent noise properties. The technology to minimize the noise levels for FPSO has been established throughout the construction of this ship.

• 호남수학학술지
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• 제40권4호
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• pp.809-816
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• 2018

The aim of this research paper is to evaluate fifty double integrals invoving generalized hypergeometric function (25 each) in the form of $${{\int}^1_0}{{\int}^1_0}\;x^{{\gamma}-1}y^{{\gamma}+c-1}(1-x)^{c-1}(1-y)^{c+{\ell}}(1-xy)^{{\delta}-2c-{\ell}-1}{\times}_3F_2\[{^{a,\;b,\;2c+{\ell}+1}_{\frac{1}{2}(a+b+i+1),\;2c+j}}\;;{\frac{(1-x)y}{1-xy}}\]dxdy$$ and $${{\int}^1_0}{{\int}^1_0}\;x^{{\gamma}-1}y^{{\gamma}+c+{\ell}}(1-x)^{c+{\ell}}(1-y)^{c-1}(1-xy)^{{\delta}-2c-{\ell}-1}{\times}_3F_2\[{^{a,\;b,\;2c+{\ell}+1}_{\frac{1}{2}(a+b+i+1),\;2c+j}}\;;{\frac{1-y}{1-xy}}\]dxdy$$ in the most general form for any ${\ell}{\in}{\mathbb{Z}}$ and i, j = 0, ${\pm}1$, ${\pm}2$. The results are derived with the help of generalization of Edwards's well known double integral due to Kim, et al. and generalized classical Watson's summation theorem obtained earlier by Lavoie, et al. More than one hundred ineteresting special cases have also been obtained.

• Communications for Statistical Applications and Methods
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• 제28권1호
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• pp.1-19
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• 2021

Heavy tailed distributions are useful for modeling actuarial and financial risk management problems. Actuaries often search for finding distributions that provide the best fit to heavy tailed data sets. In the present work, we introduce a new class of heavy tailed distributions of a special sub-model of the proposed family, called a new extended alpha power transformed Weibull distribution, useful for modeling heavy tailed data sets. Mathematical properties along with certain characterizations of the proposed distribution are presented. Maximum likelihood estimates of the model parameters are obtained. A simulation study is provided to evaluate the performance of the maximum likelihood estimators. Actuarial measures such as Value at Risk and Tail Value at Risk are also calculated. Further, a simulation study based on the actuarial measures is done. Finally, an application of the proposed model to a heavy tailed data set is presented. The proposed distribution is compared with some well-known (i) two-parameter models, (ii) three-parameter models and (iii) four-parameter models.