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조은형,정진태 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
본 논문에서는 Hamilton의 원리를 이용하여 전개하는 보에 대한 지배방정식과 경계조건을유도한다. 유도된 지배방정식은 순간고유형상의 시간의존 기저함수를 이용한 Galerkin 방법으로 이산화한다. 본 논문에서는 이산화된 방정식을 가지고 보가 전개할 때와 후퇴할 때의 시간응답해석을 수행하며 이를 통해 시간에 따라 길이가 변하는 보의 종진동에 대한 전형적인 양상을 제시한다. In this paper, the governing equation and the boundary conditions of deploying beam are derived using Hamiltons principle. The Galerkin method with time-dependent basis functions of the instantaneous natural modes is adopted to discretize the governing equation. Based on the discretized equations, the time integration analysis is performed and numerical results for the deploying and retrieving velocity are analyzed to illustrate the qualitative features of longitudinal vibrations.
태권도 품새 경기의 주관적 평가결과의 오차원 분석: 일반화가능도 이론 적용
조은형,Cho, Eun Hyung 한국데이터정보과학회 2016 한국데이터정보과학회지 Vol.27 No.2
본 연구는 G-Theory를 적용하여 태권도 품새 평가항목에 대한 채점자 간 평가점수의 신뢰도를 추정하기 위해 G-연구로 경기일 수, 채점자 수를 다중오차원으로 선정하고 이들 변인간의 상호작용으로 인한 오차변량의 상대적 크기에 의해 오차원을 분석하고, G-연구의 결과를 토대로 D-연구를 수행하여 최적의 측정조건을 결정하는 데 목적이 있다. 결과를 요약하면 다음과 같다. G-Theory를 적용하여 태권도 품새 평가항목 중 정확성에 대해 분산성분 추정치를 추정한 결과, 오차의 영향력은 채점자국면에서 가장 크게 나타났으며, 각 설계에 따른 상호효과 (피험자 내), 피험자 간 순서였으며, 표현성 평가항목에 대한 분산성분 추정치 오차의 영향력은 상호효과 (피험자 내)국면에서 가장 크게 나타났으며, 각 설계에 따른 피험자 간, 채점자 국면 순으로 나타났다. 마지막으로 D-연구를 통하여 일반화가능도계수를 추정한 결과, 채점자 수에 따른 최적수준의 측정조건은 정확성 평가항목에서 8명의 채점자일 때 안정적인 신뢰도를 얻을 수 있으며, 표현성 평가항목에서는 7명의 채점자일 때 안정적인 신뢰도를 얻었다. This study aims to apply the G-theory for estimation of reliability of evaluation scores between raters on Taekwondo Poomsae rating categories. Selecting a number of game days and raters as multiple error sources, we analyzed the error sources caused by relative magnitude of error variances of interaction between the factors and proceeded with D-study based on the results of G-study for optimal determination of measurement condition. The results showed below. The estimated outcomes of variance component for accuracy among the Taekwondo Poomsae categories with G-theory showed that impact of error was the biggest influence factor in raters conditions and in order of interaction in subjects and between subjects, also impact of variance component estimation error on expression category was the major influence factor in interaction and in order of the between subjects and raters. Finally, the result of generalizability coefficient estimation via D-study showed that measurement condition of optimal level depend on the number of raters was 8 persons of raters on accuracy category, and stable reliability on expression category was gained when the raters were 7 persons.
구조동역학 문제에서 전단계 오차추정치를 이용한 자동시간간격 조정 알고리듬
조은형,정진태 한국소음진동공학회 1999 소음 진동 Vol.9 No.6
A prior error estimator which is solving structural dynamic problems and which is based on the generalized-method, is developed. Since the proposed error estimator is computed with only previous information, the time step size can be adaptively selected without the feedback mechanism. This paper shows that the automatic time stepping algorithm using the error estimator performs an efficient time integration. To verify its efficiency, several examples are numerically investigated.
멕시코와 네팔도입 고추 유전자원의 두 가지 점무늬병에 대한 저항성
조은형,김정훈,전수경,이지선,김병수 慶北大學校 農業科學技術硏究所 2005 慶北大農學誌 Vol.23 No.-
Pepper genetic resources consisting of introductions from Mexico and Nepal and susceptible and resistant controls were tested for resistance to gray leaf spot and to bacterial spot by serially inoculating the two disease pathogens, Stemphylium spp. first and Xanthomonas campestris pv. vesicatoria next, with application of fungicide after evaluation of resistance to gray leaf spot first. KC866, KC872, KC902, KC905 were resistant to gray leaf spot in addition to known resistance sources, KC43, KC47, KC220, KC319, KC320, KC380. KC897 was on the top of the resistance sources list, even better than KC177(163192), and was followed by KC889, KC896, KC898, all of which were introductions from Nepal.
조은형,좌성훈,정진태 한국소음진동공학회 2001 소음 진동 Vol.11 No.3
In this study, the fracture phenomena of optical disks are discussed by theoretical and experimental approaches and then some recommendations are presented to prevent the fracture. Linear equations of motion are discretized by using the Galerkin approximation. From the discretized equations, the dynamic responses are computed by the generalized- time integration method. As a fracture criterion for optical disks, the critical crack length is presented. From experimental methods, the fracture procedure is analyzed. The fracture occurs when disks have crack on the inner radius of the disks. Since the crack growth and the fracture result from the stress concentration on the tip of the crack, a measure should be taken to overcome the stress concentration. This problem can be resolved by the structural modification of a disk. This study proposes 3 types of improved optical disks.