• 한국의류학회지
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• 제20권6호
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• pp.1016-1026
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• 1996

The purpose of this study was to extract protypes from features and concrete images of Lotus and Crane patterns. A qualitative and a quantitative methods were used. Qualitative informations were obtained from depth Interviews for pattern selection and feature extraction, and quantitative informations from a quail-experiment for pattern caregorization. The subjects were 20 female design students and non-design, students in Teajon. The results were summerized into a similarity metrix which was interpreted by the cluster analysis and the multi-dimensional scling(MDS). The patterns for the study were grouped into 8 clusters. Four dimensions were chosen for the MDS. The location of each pattern was visualized in a 2-dimesional spaces and the location of each cluster in a 3-dimensional spaces. The first dimension, "Lotus" vs "Crane" refired to pattern types, and the second dimension, "realistic" vs "transformable", the transformability. The third dimension, "simple" vs "complex", refired to the degree of simplification, and the forth dimension, "continuous" vs "discontinuous", continuity. The results of the Quantitative analysis could be summerized into 3-level prototype hiararchy In the first level, the patterns were devided clearly into two groups. Lotus and Crane by pattern types. In the second levelk, each group was devided into twosubgroups by continuity. In the third, each subgroup was divided into four subgroups by transformability and the degree of simplification. Four protypes, the final targets of the present study, were extracted from the third level. The are Stylized, Realistic, Decorative, Abstract types.d from the third level. The are Stylized, Realistic, Decorative, Abstract types.

• 제어로봇시스템학회논문지
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• 제22권9호
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• pp.710-715
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• 2016

Due to its simplicity and high reliability, the box-counting(BC) method is one of the most frequently used techniques to estimate the fractal dimensions of a binary image with a self-similarity property. The fractal calculation requires data sampling that determines the size of boxes to be sampled from the given image and directly affects the accuracy of the fractal dimension estimation. There are three non-overlapping regular grid methods: geometric-step method, arithmetic-step method and divisor-step method. These methods have some drawbacks when the image size M becomes large. This paper presents a BC algorithm for enhancing the accuracy of the fractal dimension estimation based on a new sampling method. Instead of using the geometric-step method, the new sampling method, called the coverage ratio-step method, selects the number of steps according to the coverage ratio. A set of experiments using well-known fractal images showed that the proposed method outperforms the existing BC method and the triangular BC method.

• 농업과학연구
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• 제41권4호
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• pp.379-384
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• 2014

In general, fractal analysis which is based on self-similarity as a basic theory has been mainly used to define the characteristics of complex mathematical figures, however, considering its basic theory, it can be also used to analyze the surface ununiformity of unknown materials. In this study, the soil samples were collected from the reclaimed (remodelled) agricultural fields which mean that the external soil is artificially piled up (mainly up to 1m) on the lands, Naju, Jellanam-do and Gumi, Gyeongsangbuk-do, and the conventional agricultural fields, Anseong, Gyeonggi-do and Hwasoon, Jellanam-do, and compared using fractal dimension analysis on the basis of the results of chemical properties. The score of fractal dimension ($D_0$) for organic matter was lower in Hwasoon (1.46) and Naju (1.58) than Anseong (1.86) and Gumi (1.96), and this trend showed similarly in soil pH. On the basis of the results of chemical properties, fine textured-soils (Hwasoon and Naju) and conventional agricultural fields were chemically uniform compared to coarse textured-soils (Anseong and Gumi) and the reclaimed. Therefore, it is required to develop technical methods for integrated soil management to the reclaimed lands.

• 대한수학교육학회지:수학교육학연구
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• 제16권2호
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• pp.115-138
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• 2006

본 연구의 목적은 문제 해결 과정 중 문제 이해나 계획 단계에서 학생들이 구성하는 유사성 탐구이다. 사례연구를 통하여 학생들이 수학 문장제를 해결하는 과정에서 구성하는 유사성들과 그러한 유사성들이 어떻게 구성되는지를 고찰하였다. 연구 결과, 학생들은 처음에 문맥적인 정보를 근거로 표면적 유사성을 구성하였으며, 그것은 문제 해법을 구하는 과정에 영향을 미쳤다. 특히, 스스로 구성한 다이어그램을 사용하여 문제를 이해하고, 문제들 간의 유사점과 차이점을 생각한 학생은 이전에 경험했던 식을 주어진 문제에 적합하게 변형하였다. 그러나 표면적 유사성만을 바탕으로 총체적으로 문제를 이해하는 학생은 이전에 적용하였던 식을 주어진 문제 해결에 적용할 수 있도록 변형하지 못했다.

• 한국지반공학회논문집
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• 제18권6호
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• pp.25-32
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• 2002

전통적인 흙의 입도분포 곡선상에서 흙의 구성 성분에 따른 프랙탈 차원의 변화에 대해서 Wu등(1993)과Bittelli 등(1999)의 연구결과를 중심으로 Buchan 등(1993)의 실험결과를 이용하여 고찰하였다. 자료분석시에는 실트와 모래의 경계값의 변화에 따른 프랙탈 차원의 변화를 알아보기 위하여 20$\mu{m}$, 63$\mu{m}$ 그리고 125$\mu{m}$에 대한 프랙탈 차원을 산정하여 전체 범위에서 구한 프랙탈 차원과 비교하였다. 분석결과에서는 전통적인 입도분포곡선상에서 프랙탈 차원의 산정은 가능한 것으로 나타났으며, 실트와 모래성분의 경계값은 Wu 등(1993)이 제시한 것 보다 Bittelli 등(1999)이 제시한 경계값이 더 적절함을 알 수 있었다. 또한 Bittelli 등(1999)이 제시한 실험식을 이용해서 실트영역의 프랙탈 차원을 비교적 정확하게 산정할 수 있었다.

• 한국멀티미디어학회논문지
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• 제7권2호
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• pp.173-186
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• 2004

영상 검색의 수행 방법으로 사람의 시각 시스템의 특성을 기반으로 주요 의미를 갖는 객체의 효과적인 특징 추출을 통한 내용기반 영상 검색 시스템을 제안한다. 관심 객체 영역이 우선적으로 검출되도록 하기 위해 영상 내에서 비교적 면적이 크고 배경색상과의 차이가 크면서 영상의 가운데 위치하는 영역을 의미를 갖는 주요 객체로 판단하였다. 영상 고유의 특징을 얻기 위해서는 영상의 객체 윤곽선의 전체 길이를 정규화 된 일정한 세그먼트로 분할한 후에 객체 윤곽선의 세그먼트가 갖는 편각차분 벡터들의 누적 합과 양분된 객체의 시그너처를 추출하여 물체의 회전과 크기 변화에 적응적인 형태 특징으로 사용한다. 이와 같은 형태 특징을 필두로 해서 질감 샘플과 칼라, 그리고 이심률 정보를 결합하여 유사도를 측정함으로써 이동, 회전 크기 변화에 강건한 검색이 가능했으며 영역의 부분적인 변화나 손상으로 인한 객체 특성의 왜곡 현상에 덜 민감하게 반응하였다. 또한 Box-Counting Dimension에 의한 프랙탈 차원을 이용하여 측정한 객체간 복잡도 관계를 기반으로 하여 영상 특징에 서로 다른 유사도 가중치를 부여하는 방법이 잘못된 검색을 최소로 하여 더욱 효율적인 검색율을 보였다.

• 음성과학
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• 제8권2호
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• pp.181-191
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• 2001

The acoustic quality of a vowel is known to be mostly determined by the frequencies of the first formant(Fl) and the second formant(F2). The perceptual(or psychological) dimensions of vowel perception were examined in this study. Also the relationships among perceptual dimensions, acoustical dimensions(Fl & F2), and articulatory gestures of vowel were discussed. Using multi-dimensional scaling(MDS) technique, the experiment was performed in order to identify the perceptual dimensions of the perception of Korean vowel. In the experiment 8 Seoul standard speakers performed the similarity rating task of 10 synthesized Korean vowels. Two-dimensional MDS solution based. on the similarity rating scores was obtained. The results showed that two perceptual dimensions, D1 and D2 were correlated strongly with F2 and F1(r = -.895 and .878 respectively), and were so interpreted as 'vowel advancement' and 'vowel height' respectively. The relationship between the perceptual dimensions of vowel and the articulatory positions of tongue suggested that perception may be directly linked to production. Further research problems were discussed in the .final section.

• Earthquakes and Structures
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• 제11권6호
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• pp.1143-1164
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• 2016

Time Delay of Arrival (TDOA) estimation methods based on correlation function analysis play an important role in the micro-seismic event monitoring. It makes full use of the similarity in the recorded signals that are from the same source. However, those methods are subjected to the noise effect, particularly when the global similarity of the signals is low. This paper proposes a new approach for micro-seismic monitoring based on cross wavelet transform. The cross wavelet transform is utilized to analyse the measured signals under micro-seismic events, and the cross wavelet power spectrum is used to measure the similarity of two signals in a multi-scale dimension and subsequently identify TDOA. The offset time instant associated with the maximum cross wavelet transform spectrum power is identified as TDOA, and then the location of micro-seismic event can be identified. Individual and statistical identification tests are performed with measurement data from an in-field mine. Experimental studies demonstrate that the proposed approach significantly improves the robustness and accuracy of micro-seismic source locating in mines compared to several existing methods, such as the cross-correlation, multi-correlation, STA/LTA and Kurtosis methods.

• 한국의류학회지
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• 제19권2호
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• pp.203-215
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• 1995

The funning process in the symbolism of dress can be approached by the semiotics of C. S. Pierce. According to Pearce\ulcorners theory, symbiosis consists of sign, its object, and interpret ant. Especially Pierce classifies the sign into three categories; icon, index, and symbol. The icon is based on the similarity in properties and forms, and the index is based on the actual connection with their objects, while the symbol is based on the association of interpret ant. This classification method can be considered as a theoretical base for symbol of ritual dress. On the other hand, it was discussed the analyzing method of the concept of dress same (symbolic element) by introducing the isolate concept of structuralism for explaining how the symbol reveals itself. So it is discussed the several concepts of structuralism; the concept of relation syntagmatique and relation paradigmatique, the relation binaries, and the units. It would be also necessary to consider dimension of context in addition to dimension of dress itself for the dimension of total symbolic elements of ritual dress. It is proposed that the above developed dress symbol elements should be used for under\ulcornerstanding the society or culture that includes the elements by introducing the symbolic anthropology such as V. Turner's three dimensions of symbol.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.567-570
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• 2003

Fractal mathematics is being highlighted as a research method for classification of image. But the application of Fractal dimension(FD) has been required the complicated calculation method because of its complex repetition progressing. In this paper, it has been developed the new approach method to express the Fractal Dimension(FD) for aging level calculation and estimation system of outside insulator using special image processing algorithm. As a result after FD testing, the recognized aging estimation of FD has a very characteristics compared to the conventional visual inspection.