• Title, Summary, Keyword: 편각의 원리

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Method for checking Missed eigenvalues of Eigenvalue Problem Considering Damping Matrix (감쇠행렬을 고려한 고유치문제의 누락된 고유치 검사 기법)

  • 정형조;김병완;이인원
    • Journal of the Earthquake Engineering Society of Korea
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    • v.4 no.2
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    • pp.47-56
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    • 2000
  • 지반-구조물 상호작용 시스템 구조물의 진동제어 시스템 복합재료 구조물과 같은 비비례 감쇠 구조물의 경우 정확한 동적응답을 얻기 위해서는 감쇠행렬을 고려한 고유치 문제를 계산하는 것이 필수적이다 그러나 대부분의 고유치 해법에서는 구하고자 하는 고유치 중 일부를 누락시킬 수 있기 때문에 어떤 고유치 해법이 실제문제에 응용 가능한 방법이 되기 위해서는 누락된 고유치의 존재 여부를 검사하는 기법을 포함하고 있어야만 한다. 비감쇠나 비례감쇠 시스템의 경우에는 널리 알려진 Sturm 수열성질을 이용하여 누락된 고유치를 쉽게 검사할 수 있는 반면에 비비례 감쇠 시스템의 경우에는 널리 알려진 Sturm 수열 성질을 이용하여 누락된 고유치를 쉽게 검사할 수 있는 반면에 비비례 감쇠 시스템의 경우에는 아직까지 검사 기법이 개발되어 있지않다 본 논문에서는 편각의 원리를 이용하여 감쇠행렬을 고려한 고유치 문제의 누락된 고유치의 존재여부를 검사하는 기법을 제안하였다 제안방법의 효용성을 검증하기 위하여 두가지 수치예제를 고려하였다.

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Concept Design of Angular Deviation and Development of Measurement System for Transparency in Aircraft (항공기 투명체의 편각개념 설계 및 측정 시스템 개발)

  • Moon, Tae-Sang;Woo, Seong-Jo;Kwon, Seong-Il;Ryu, Kwang-Yeol
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.11
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    • pp.1123-1129
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    • 2010
  • Angular Deviation(AD) on transparency applied to TA-50 Aircraft deteriorates armament system's accuracy because it makes a difference in between actual and theoretical targets. In order to increase accuracy, therefore, TA-50 Aircraft measures AD on transparency and provide the measured values for the integrated mission display computer as a type of AD coefficients. This makes AD revised so that pilots can accurately see the actual target on their head-up display. In order to implement such mechanism into a real field, we develop a new device and system automatically measuring AD for the first time. We also deal with basic concept including AD induction formula as well as operating systems. As a consequence of testing the accuracy and precision for verifying reliability of the system, we got satisfactory results. In specific, the accuracy was within the resultant criterion of 1%. The precision was also satisfied with respect to the whole criteria. The system developed through this research is qualified as a military standard equipment for transparency of the canopy.

나이퀴스트 선도 및 보우드 선도를 이용한 폐루프 제어시스템의 안정도 판별

  • Gang, Tae-Sam
    • ICROS
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    • v.16 no.4
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    • pp.35-41
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    • 2010
  • 나이퀴스트 선도와 보우드 선도는 주파수 영역에서 시스템의 안정성을 판별하는 중요한 수단이다. 본 소고에서는 나이퀴스트 판별법의 근간이 되는 편각의 원리, 그리고 이에 기초한 나이퀴스트 판별법, 이를 활용한 안정도 및 안정도 여유 판별법, 그리고 나이퀴스트 선도와 보우드 선도와의 관계 및 활용시의 장단점을 비교함으로써, 제어기 설계시 도움이 되도록 하였다.

Checking Techniques for Missed Eigenvalues of Nonproportionally Damped System (비비례감쇠 시스템의 고유치해석에 필요한 누락고유치 검사기법)

  • 정형조;조지성;김병완;이인원
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.948-951
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    • 2004
  • This paper introduces the two recently developed checking techniques far missed eigenvalues of nonproportionally damped system. The first technique is based on the argument principle. On the other hand, the second one is based on Rombouts' algorithm and Gleyse's theorem, which has been known as the effective and well-proven method. In the paper, the main features of the two techniques are explained and their effectiveness is also investigated by considering a numerical example.

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A Cartographic Generalization for Correcting Spatial Errors of Linear Features (지도제작에 따른 선형사상의 공간적 오류 개선을 위한 일반화)

  • Kim, Nam Shin
    • Journal of the Korean Association of Geographic Information Studies
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    • v.7 no.1
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    • pp.39-51
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    • 2004
  • This study aims to suggest new algorithm, named as Simoo, in order to improve spatial conflicts and vector displacement between linear features in generalization of the linear features. Main principles of Simoo algorithm is adoption of simplification and smoothening methods. Tolerance conditions used in Simoo are perpendicular length, external angle, and average vertex length. Main characteristics of Simoo are the application of scale, cartographic refinement, minimization of logical errors, and maintenance of geographical properties. The Simoo was applied through comparison to existing Douglas-Peucker algorithm. Resultantly, maintenance ratios of line such as coastal line and stream network were over 97% in both algorithms. The elimination ratio of vertex points may be more effective in Douglas-Peucker than in Simoo. Spatial conflicts between linear features may be more minimized in Simoo. The curvature and smoothening of lines become decreased in scale in application of Simoo. Finally, Simoo algorithm may be more effective than Douglas-Peucker for cartographic generalization.

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A Study on the Cartographic Generalization of Stream Networks by Rule-based Modelling (규칙기반 모델링에 의한 하계망 일반화에 관한 연구)

  • Kim Nam-Shin
    • Journal of the Korean Geographical Society
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    • v.39 no.4
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    • pp.633-642
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    • 2004
  • This study tries to generalize the stream network by constructing rule-based modelling. A study on the map generalization tends to be concentrated on development of algorithms for modification of linear features and evaluations to the limited cartographic elements. Rule-based modelling can help to improve previous algorithms by application of generalization process with the results that analyzing mapping principles and spatial distribution patterns of geographical phenomena. Rule-based modelling can be applied to generalize various cartographic elements, and make an effective on multi-scaling mapping in the digital environments. In this research, nile-based modelling for stream network is composed of generalization rule, algorithm for centerline extraction and linear features. Before generalization, drainage pattern was analyzed by the connectivity with lake to minimize logical errors. As a result, 17 streams with centerline are extracted from 108 double-lined streams. Total length of stream networks is reduced as 17% in 1:25,000 scale, and as 29% in 1:50,000. Simoo algorithm, which is developed to generalize linear features, is compared to Douglas-Peucker(D-P) algorithm. D-P made linear features rough due to the increase of data point distance and widening of external angle. But in Simoo, linear features are smoothed with the decrease of scale.