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      • 확률론적 연쇄사고 분석을 위한 시각화 모형 개발

        최영도,백자현,김태균,전동훈,윤기갑,박상호,구보경,허진,Choy, Youngdo,Baek, Ja-hyun,Kim, Taekyun,Jeon, Dong-hoon,Yoon, Gi-gab,Park, Sang-Ho,Goo, Bokyung,Hur, Jin 한국전력공사 2018 KEPCO Journal on electric power and energy Vol.4 No.1

        According to the recent blackouts, large blackouts can be described by cascading outages. Cascading outage is defined by sequential outages from an initial disturbance. Sequential and probabilistic approach are necessary to minimize the blackout damage caused by cascading outages. In addition, conventional cascading outage analysis models are computationally complex and have time constraints, it is necessary to develop the new analytical techniques. In this paper, we propose the advance visualization model for probabilistic analysis of cascading failure risks. We introduce the visualization model for identifying size of cascading and potential outages and estimate the propagation rate of sequential outage simulation. The proposed model is applied to Korean power systems.

      • KCI등재후보

        토석류의 토사체적농동에 따른 퇴적특성변화에 관한 실험연구

        최영도,이호진,김성덕 한국방재안전학회 2022 한국방재안전학회 논문집 Vol.15 No.3

        The purpose of this study is to investigate the sedimentation area and runout distance in the downstream when debris flow occurred on amountain slope through an experimental performance. Super typhoons and torrential rains caused by climate change cause large-scaledebris flow disasters in the downstream areas of mountainous areas, mainly where sediments are deposited and flowed downstream. Toanalyze the characteristics of the sediment deposited downstream, the disposition area and runout distance were investigated throughexperiments in the case of a straight channel and channel with berm, respectively. As experimental conditions, changes in sedimentvolume concentration and channel slope, and channel with or without berm, reduction rates in sedimentation area and runout distancewere investigated. In the straight channel, the steeper the channel slope and the lower the sedimentation concentration, the sedimentationarea and runout distnace were increased. In a channel with berm, the runout distance and sediment area increased as the slope becamesteeper and the sediment area decreased. 본 연구의 목적은 산지 사면에서 토석류가 발생했을 때, 하류에서 토사퇴적면적과 도달거리를 실험을 통해 조사한 것이다. 하류에 퇴적하는 토사의 특성을 분석하기 위하여 수로사면에 소단을 설치하였을 경우 또는 직선 수로인 경우 토사퇴적면적과 도달거리를 실험을 통해 분석하였다. 실험조건으로서는 토사체적농도의 변화 및 수로의 경사변화 그리고 수로의 형태에 따라서 토사퇴적면적과 도달거리의 감소율을 조사하였다. 직선수로에서 수로경사가 급할수록 그리고 토사퇴적농도가 감소할수록 토사퇴적면적과 도달거리는증가하였다. 소단을 갖는 수로에서는 경사가 급할수록 토사퇴적농도가 감소할수록 도달거리 및 토사퇴적농도가 증가하였다. 두 수로에서 토사퇴적면적과 도달거리의 차단율을 비교해보면, 소단을 갖는 수로에서 직선수로인 경우보다 토사퇴적면적과 도달거리의 차단율이 더 높았다. 본 연구의 결과는 급경사지 비탈면에서 토석류가 발생했을 때 효율적인 토석류 저감 또는 방어 대책을 세워 토석류에 의한 피해를 줄이는 데 정보를 제공할 것이다.

      • William Wordsworth의 詩에 나타난 Mysticism

        崔永道 牧園大學校 1986 論文集 - 牧園大學校 Vol.11 No.-

        It is generally acknowledged that there are two Wordsworths. One Wordsworth is simple, elemental, forthright. The other is complex, paradoxical, problematic. One is the great poet of natural man and so called nature poet. The other is a visionary, mystic poet who is ultimately hostile to temporal man and the world of sense. And one Wordsworth is poet of light, the other is poet of darkness. As being known, the age of 1797 to 1814 is that of his poetic maturity. Above all, he was a religious, meditative and philosophical poet. In a sense Wordsworth's constant metaphysical concern continued fro the first period of hip poetic life to the last phase of his poetic life. Mysticism is the most conspicuos characteristicus of his poetry. In a true sense heh as a visionary sense and he did see visions in this world which other human being could never see clearly. In order to understand William Wordsworth we must understand the world of his mysticism expressed in his poems such as Prelude, Tintern Abbev, Resolution and Independence. William Wordsworth was not only a nature poet but a seer, mystic and actually was a psychologist. What he could find in the world and universe was not the beauty of nature but life in nature. He saw the life, he felt the life. In this brief thesis the writer have tried to pursue mysticism by analyzing his major poem mentioned above, and also the writer tried to identify and distinguish metaphysical positions and his own identity and his poetical identity in this world. And especially the writer traced his mystic vision through imagery crystallized in his important works.

      • 싸이리스터 PWM정류기를 이용한 유도가열장치

        崔泳道,李景彬,韓炳文 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-

        This paper proposes a new induction heating system composed of a thyristor PWM rectifier with a resonant commutation circuit. The operation of proposed system was first analyzed by a theoretical approach with equivalent circuits. And its verification was performed by computer simulations with EMTP. The proposed system can provide a solution for the power factor problem of the existing high-power induction heating system, which uses the line-commutated thyristor bridge in rectifier side.

      • 안테나 형태에 따른 대면적 ICP 플라즈마의 균일도 면화에 관한 연구

        최영도,노태협,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-

        대면적 균일 ICP 플라즈마를 발생시킬 수 있는 IPC용 안테나 개발을 위하여 안테나 구조와 안테나에 흐르는 전류 방향에 따른 발생 플라즈마의 특성을 Langmuir 탐침과 자기 탐침을 이용하여 관찰하였다. 안테나의 구조가 내부 안테나와 외부 안테나로 이루어진 두 안테나에 흐르는 전류방향이 반대 방향일 때는 같은 방향일 때보다 플라즈마 밀도 균일도가 향상되는 경향을 가졌다. 직경 300mm에서의 플라즈마 균일도가 2~3%를 나타내었다. 이 결과를 이용하여 Super Flat Antenna(SFA)를 개발하였다. This paper presents effects of antenna shape and current direction on plasma density uniformity for a large area uniform ICP plasma parameters. The antennae were composed of a rectangular inner and outer antenna. When the current direction along the antenna was opposite, plasma uniformity was improved in compare with the same current direction along the antenna. The optimized antenna can generate the uniform plasma within 2-3% uniformity in 300mm diameter and is called Super Flat Antenna (SFA).

      • Robert Frost의 詩에 나타난 Dualism

        崔永道 牧園大學校 1981 論文集 - 牧園大學校 Vol.4 No.-

        In this paper, the writer tries to emphasize the characteristics of the metaphorical skep-thcism and dualism in the poetry of Frost. He writes about solid New England places and work. Unlike Emily Dickinson, he has no iterest in writing about the abstract in abstrast terms. He chiefly writes about nature and man concretely. Frost's special distin-ction as a poet rest in his skill in writing, in one poem, on several levels of meaning. In the first place, He was a Synecdochist who figures of speech in which we use a part for the whole. From early Poems to the last Poems, he ran through this attitude. In "After apple-picking", he stands for his memory of life, for his experience of death. His intellectual qualities are as apparent in his images, rhythms, and forms as in his dualistic contents. Indeed, Frost was not a pessimist but a skeptist. He reveals also skeptical view point of the world and human being only through metaphysical metaphors. This attitude is true of West-Running Brook which was hailed with loud enthusiasm. In this poem , he shows himself as a Bergsonian philosopher. West-Running Brook is a reflection and resta-tement of all that has gone before. He cannot suggest a character or a natural landscapes without informing the subject with his own philosophy, a philosophy whose flippant accents cannot hide a moral earne-stness. Beyond the fact, beyond the tone of his voice, the poet's main interst was unifying and ardent emotions which is Frost's peculiar qulity and his essential spirit.

      • 곡선회귀분석을 이용한 풍력발전 출력 예측에 관한 연구

        최영도,정솔영,박범준,허진,박상호,윤기갑,Choy, Youngdo,Jung, Solyoung,Park, Beomjun,Hur, Jin,Park, Sang ho,Yoon, Gi gab 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.4

        Recently, the size of wind farms is becoming larger, and the integration of high wind generation resources into power gird is becoming more important. Due to intermittency of wind generating resources, it is an essential to predict power outputs. In this paper, we introduce the basic concept of curvilinear regression, which is one of the method of wind power prediction. The empirical data, wind farm power output in Jeju Island, is considered to verify the proposed prediction model.

      • O'Neill의 悲劇的 觀點

        崔永道 牧園大學校 1982 論文集 - 牧園大學校 Vol.5 No.-

        그는 원래부터 자전적인 글을 쓰려고 여러번 시도했었다. 그의 극은 후기로 올수록 외부적인 행동보다 심리적인 행동으로, 외부적 갈등보다 내부적 갈등으로 그 다루는 분야가 변한다. 온갖 경험을 무대에 표출시켰고 거기에 맞는 온갖 테크닉의 실험을 거쳤지만 그는 어디서도 만족을 느끼지 못하였다. 그래서 그는 오랜 은거 끝에 눈을 안으로 돌려 자기의 내부를 들여다 보고 자기의 과거를 들여다 보고 자기의 가족을 살펴보고 시대를 초월하여 보편적인 감동을 줄 수 있는 극을 만들었다. 초기의 극들은 자기의 아집과 자기연민 때문에 객관적으로 사물을 바라볼 수 없어 자전적인 글을 쓰지 못했으나 이제 자신의 좁은 시야를 탈피하여 초월적인 관점으로 모든 것을 바라보았다. 극중에서 다른 세 인물에게는 그 경험이 “journey into night"이 될지 모르지만 Edmund에게만은 그것이 ꡒjourney beyond nightꡓ이 된다. 그러므로 그의 극은 패배의 비극이 아니라 고난을 통한 개안(開眼)의 극이 되는 것이다. O'Neill은 자신의 오랜 극작경력의 결산을 ꡒ눈물과 피ꡓ로 쓴 자전적인 극으로 짓고 있으며 신이 없어진 현대사회에서의 구원을 자아의 극복과 타인의 이해를 통해 추구하고 있다.

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