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이규원,박구만,박소연,최해근,김성권 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.6
360° video has a lot of image information and usefulness, however, the position of the audio source judged by hearing is different from the position on the screen, therefore, human feels tired, the immersion decrease and user can’t watch video for more long time. In this paper, the concordance rate of video and audio localization is defined. The rate is expressed in a percentage. It means how much the system make the sound localization real according to the position of the source on the screen. With this rate, the audio localization performance of immersive audio producing and playing system can be evaluated. It will be helpful for developers to make the higher performance system and expected to contribute to making high quality system with reality. 360° 영상은 많은 영상정보를 담고 있어 유용하나, 눈에 보이는 물체의 방향과 그 물체의 소리가 들려오는 방향이 다른 경우 시청자에게 피로도를 느끼게 하여 감각적 이질감이 증대되어 그 활용도가 떨어지고 있다. 이에 본 논문에서는 360° 영상에서 시선에 따른 음향 정위가 얼마나 일치하는지를 백분율로 나타내는 기준을 제안하며, 제시한 영상 음향 정위 일치율을 이용하여 몰입도를 증대시키는 360° 영상의 제작 가능성을 제시한다. 제안한 영상 음향 정위 일치율은, 입체음향 콘텐츠 제작, 재생 솔루션의 정위 성능을 측정, 평가에 유용하고, 더욱 실감성 높은 시스템을 제작하는데 기여할 것으로 기대한다.
FUZZY 이론에 의한 트러스 構造物의 最適化에 관한 硏究
李奎遠,李珍遠,梁昌容 全北大學校 1996 論文集 Vol.42 No.-
Fuzzy theory is useful in dealing with vagueness and ambiguities concerned with subjective judgement of human beings. In this research the optimization of the section area of truss structure has been tested by using fuzzy theory. The section area of member was chosen with design variable and the weight function of strucure was chosen with objective function. According to changing constraint conditions linearly with using fuzzy set, various optimum object functions will be obtained by feasible direction method. This algorithm was applied practically to the 10 bar truss structure and subsequently came to almost same value of objective function. Therefore this algorithm appers to be effective method of section area optimization. Accordingly, the optimization of truss structures which utilizes the results of this study can be helpful in economical design of truss stuctures.
이규원 충남대학교 농업과학연구소 1982 農業技術硏究報告 Vol.9 No.-
Formulation of the geometric optimization for truss structures based on the elasticity theory turn out to be the nonlinear programming problem which has to deal with the cross-sectional area of the member and the coordinates of its nodes simultaneously. A few techniques have been proposed and adopted for the analysis of this nonlinear programming problem for the time being. These techniques, however, bear some limitations on truss shapes, loading conditions and design criteria for the practical application to real structures. A generalized algorithm for the geometric optimization of the truss structures, which can eliminate the above mentioned limitations, is developed in this study. The algorithm developed utilizes the two-phases technique. In the first phase, the cross sectional area of the truss member is optimized by transforming the nonlinear problem into SUMT and solving SUMT utilizing the modified Newton-Raphson method. In the second phase, the gecometric shape is optimized utilizing the unidirectional search technique of the Rosenbrock method which make it possible to minimize only the objective function. The algorithm developed in this study is numerically tested for several truss structures with various shapes, loading conditions and design criteria, and compared with the results of the other algorithm to examine its applicability and stability. The numerial comparisons show that the two-phases algorithm developed in this study is safely applicable to any design criteria, and the convergency rate is very fast and stable compared with other iteration methods for the geometric optimization of truss structures.