• 인지과학
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• 제1권1호
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• pp.103-127
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• 1989

예를 이용하여 학습하는 방법은 ALEX,LP,LEX 에 이르기까지 각각 특유의 방법을 가지면서 발전해 왔다.특히 Silver 의 LP 시스템은 방정식(Symbolic Equation)을 푸는데 있어, 과거에 풀었던 예로부터 이에 적용된 일련의 연산자들을 이용하는 방법으로 구축되어 있다. 본논문에서는 기존의 학습시스템 LEX,LP를 보다 일반화시킨 새로운 학습시스템 LRD를 제안한다. LRD에서는 연구된 예에서의 연산자 활용을 이와 유사한 모든 문제에까지 적용시킬 수 있도록 하기위하여 일반화 과정과 세분화 과정을 설정하여 학습하는 방법을 제시한다.초월함수의 치역을 구하는 예를 통하여 LRD의 학습기법을 설명하고,기존의 LEX및 LP시스템 에서 다루어지는 문제들을 통해 LEX및 LP시스템과 LRD 시스템이 비교 되어진다.

• Journal of applied mathematics & informatics
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• 제27권3_4호
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• pp.933-941
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• 2009

In this paper, we consider p-Laplace equation which models the turbulent flow in a porous medium. Using a continuation principle (cf. [R. $Man{\acute{a}}sevich$ and J. Mawhin, Periodic solutions for nonlinear systems with p-Lplacian-like operators, J. Diff. Equa. 145(1998), 367-393]), we prove the existence of solutions for p-Laplace equation subject to periodic boundary conditions, under some sign and growth conditions for f. With the help of Leray-Schauder degree theory, the multiplicity of periodic solutions for p-Laplace equation is obtained under the similar conditions above and some known results are improved.

• 조명전기설비학회논문지
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• 제14권2호
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• pp.8-17
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• 2000

본 연구에서는 부분방전의 인식을 위한 두가지 접근법을 제안하였다. 첫 번째로는 백프로파게이션 알고리즘을 적용한 신경회로망이구 두 번째로는 두 연산자 백터간의 사이각 계산이다. 부분방전신호는 IEC(b), 침대평판 및 CIGRE method II 등 3가지 전극계로부터 각각 검출되었다. 신경회로망과 벡터의 사이각을 이용한 방법 모두 이리 학습된 패턴에 대해서는 양호한 인식능력을 보였다. 그려고 사용되는 연산자의 수가 미학습패턴의 인식능력에 큰 영향올 미쳤다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1817-1827
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• 2009

Although human error is recognized as the primary cause of railway accidents and incidents, there have been limitations in finding the root causes of errors and developing effective corrective actions in the Korean railway industry, due to the absence of a systematic method and lack of professional knowledge and skills of investigators. Therefore, there has been a strong need for a systematic methodology for human error analysis. This paper introduces a methodology for analyzing human error m railway operations, called HEAR (Human Error Analysis and Reduction). HEAR is intended to help analysts identify the sequences and various levels of causes of operators' erroneous actions in railway accidents or incidents and make recommendations to eliminate or reduce the future possibility of similar errors and accidents. It was developed based on a thorough investigation of various techniques for human errors analysis and feedback from field investigators.

• 한국항해항만학회지
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• 제33권2호
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• pp.153-159
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• 2009

The awareness of the high-value industry for container terminal leads competitiveness of container terminals to keep high fiercely. In regards to competitive factors of container terminal, the most important point among several factors is seemed to be the speed of container loading and unloading on quayside. In container terminals in Korea, the productivity shows big difference even though its condition is similar to each terminal. The objective of this paper is to find the critical factors of container terminal productivity, which is dependant upon the capability, quantity of quay crane, transfer vehicle, and so on. For this purpose, we have researched related literatures, and collected data about container terminals in South Korea. Furthermore, we tested sensitive analysis to evaluate the extent of productivity by changing independent variable. And then we established the regression model to evaluate which factor has had the biggest impact on productivity. The results of this paper can give terminal operators guideline to improve productivity.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2004년도 추계 학술대회 논문집
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• pp.13-18
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• 2004

In this study, a new method is proposed generating 3D wire-frames of building using the lowest level topology, points, which are input by human operators. Through the procedure, it is possible to make prediction occlusion points and generate the topology automatically among points, lines, surfaces from buildings. In order to adjust the error of initial values which are input manually, the least squares adjustment for model-image fitting is carried out using the edge information of aerial imagery. And also, model fitting procedure is done making all surfaces plane of buildings by the least squares adjustment. As a result of those procedure, 3D building models are refined similar to real figures of buildings.

• 한국정보통신학회논문지
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• 제7권7호
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• pp.1556-1562
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• 2003

본 연구에서는 SA 여파기로 불리는 ETBF의 새로운 다진 영역 표현을 제시하고 이 표현이 ETBF의 모든 영역을 포함한다는 사실을 밝혔다. SA여파기는 다단 여파기의 구조를 가진다. 첫째단(first stage)은 최대, 최소, exclusive-OR와 같은 비선형 연산으로 이루어지며 두 번째 단은 첫째단 출력들의 가중 평균으로 주어진다. 이 구조는 SAM 여파기와 같이 첫째단 여파기 윈도우의 최대수를 제한하는 방식이 가능하여 매우 유연한 구조를 갖지만, SAM 여파기와는 달리 ETBF의 부분군만을 표현하지 않고 ETBF의 전 영역을 표현할 수 있는 장점이 있다.

• Nuclear Engineering and Technology
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• 제49권3호
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• pp.638-644
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• 2017

The importance of developing a source-term assessment technology has been emphasized owing to the decommissioning of Kori nuclear power plant (NPP) Unit 1 and the increase of deteriorated NPPs. We analyzed the behavioral mechanism of corrosion products in the primary system of a pressurized heavy-water reactor-type NPP. In addition, to check the possibility of applying the CRUDTRAN code to a Canadian Deuterium Uranium Reactor (CANDU)-type NPP, the type was assessed using collected domestic onsite data. With the assessment results, it was possible to predict trends according to operating cycles. Values estimated using the code were similar to the measured values. The results of this study are expected to be used to manage the radiation exposures of operators in high-radiation areas and to predict decommissioning processes in the primary system.

• Journal of applied mathematics & informatics
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• 제39권5_6호
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• pp.769-783
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• 2021

Demirci ((1999) Vague groups. J. Math. Anal. Appl. 230, 142-156) introduced the concept of vague groups as one of uncertain reasoning structures where indistinguishable operators separate points. In this paper, we consider vague groups in which an indistinguishable operator does not need to separate points because it seems more appropriate to handle ambiguous situations. For our purposes we generalize or redefine some notions such as: vague closed subset, vague subgroup, vague kernel and vague injectiveness. Consequently we generalize most of the known results and obtain some new additional fundamental properties of vague groups, some of which are similar to ones of ordinary groups.

• 대한수학회보
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• 제60권2호
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• pp.461-473
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• 2023

Let f be a nonconstant meromorphic function of hyper-order strictly less than 1, and let c ∈ ℂ \ {0} such that f(z + c) ≢ f(z). We prove that if f and its exact difference ∆_cf(z) = f(z + c) - f(z) share partially 0, ∞ CM and share 1 IM, then ∆_cf = f, where all 1-points with multiplicities more than 2 do not need to be counted. Some similar uniqueness results for such meromorphic functions partially sharing targets with weight and their shifts are also given. Our results generalize and improve the recent important results.