• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1179-1183
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• 2010

본 연구에서는 하천유역에 대한 호우의 대표 이동방향을 결정하였다. 대상유역으로는 내성천 유역을 고려하였으며, 101개의 호우사상을 선정하여 각각의 호우사상별로 방향적 특성을 분석하였다. von Mises 분포의 주방향을 이용하여 모든 호우사상의 대표 이동방향을 결정하고, 이를 이용하여 내성천 유역에 대한 호우 대표 이동방향을 결정하였다. 아울러 호우 발생특성별(장마, 태풍, 대류성 강우)로 호우의 방향적 특성을 분류하여 각각의 특성이 구분될 수 있도록 하였다. 적용 결과, 태풍에 의한 호우의 이동방향은 기존 연구결과와 유사하게 주로 북동 방향으로 진행되었으며, 장마와 대류성 강우에 의한 호우가 대표방향 결정에 가장 큰 영향력을 갖는 것으로 나타났다. 아울러 대상유역에 대한 호우의 대표 이동방향은 mode의 특성이 뚜렷하게 한 방향으로 나타나며, 내성천 유역의 경우 대표 호우 이동방향은 59.45도로 결정되었다. 이러한 결과는 한반도에 발생하는 강우의 특성과도 잘 부합하는 것으로 판단된다.

• Tunnel and Underground Space
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• v.28 no.4
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• pp.343-357
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• 2018

Algorithm which can analyze the slope failure behavior utilizing the comprehensive information of the dense point of joint poles and the joint set orientations, both of which are obtained statistically, and the defect pattern of pole distribution has been developed. This method overcomes the potential incorrectness of the hemispheric projection method utilizing the joint set orientations only and also enhances the reliability of slope failure analysis. To this end a method capable of calculating the joint dispersion index directly from the joint pole distribution, instead of contour map, has been devised. The representative orientations for the slope failure analysis has been determined by considering the number and orientations of cone angle-dependent joint sets as well as the joint dispersion index. By engaging these representative orientations to the hemispheric projection analysis more reliable slope failure examination has been carried out. Sensitivity analysis for the potentially unstable slope of plane failure mode has been performed. Significance of joint strength index and the external seismic loading on the slope stability has been fully analyzed.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.2
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• pp.91-102
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• 2010

This study analyzed methodologies for determining the representative direction of a storm event. The mean direction, median direction, and modal direction of von Mises distribution were considered as representative directions. In addition, the results with and without considering the storm moving distance were also compared. As results, the modal directions of von Mises distribution were found to explain the directional characteristics of a moving storm much better than other methods. Also, it was found that the storm moving distance has a significant effect on the determination of representative directions of a moving storm, whose uncertainty can also be decreased significantly by considering the moving distance.

• 프린팅코리아
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• v.8 no.12
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• pp.86-87
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• 2009

지난 11월 4일 한국만로랜드(대표 케네스 엠 한센)와 BOBST는 지난 1월부터 시작된 한국시장에서의 공동마케팅의 성과를 되돌아 보고 앞으로 방향성을 제시하는 프레스 행사를 가졌다. 이날 프레스행사에는 한국만로랜드의 케네스 엠 한센 회장과 한국시장을 함께 담당하고 있는 BOBST의 일본 법인 대표인 닐 존스 대표가 참석, 한국 시장에 대한 다양한 견해를 피력하고 패키징 분야에서 밥스트가 갖고 있는 장점을 적극 홍보하는 시간을 가졌다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.703-706
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• 2003

이 논문은 입력 지문 영상에 대하여 블록 이진화와 병렬 세선화를 거친 이미지에 4개의 각기 다른 방향 성분 요소를 이용하여 각 블록에 대한 대표 방향 성분들을 추출하여 방향 성분 이미지를 얻었다. 추출된 대표 방향성분 이미지에 정의된 방향성 패턴을 적용시켜 일치되는 블록에 대하여 1차와 2차 중심점으로 추출하였다. 이렇게 추출된 1차와 2차 중심점을 이용하여 직교좌표를 생성하였다. 직교좌표는 지문영상을 처리하여 인식 및 인증시스템에서 유용하게 쓰일 수 있을 것이다.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.6
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• pp.109-117
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• 2010

This study quantified the storm direction for a river basin by applying the von Mises distribution, also determined the representative storm direction. Additionally, the whole procedure was repeated for several storm types such as frontal, typhoon and convective storms for their comparison. From the results derived by analyzing a total of 101 storm events for the Naesung river basin, the von Mises distribution was found to explain the directional characteristics of storms. The representative moving directions derived for three different storm types were significantly different each other, which is coincident with the climate of Korea. The results derived in this study could be helpful to estimate more quantitatively the difference in the runoff response with respect to the moving direction of a storm.

• Journal of the Korean Data and Information Science Society
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• v.11 no.2
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• pp.189-199
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• 2000

A major deficiency of laboratory testing of rock structure is that the structures are limited in size and therefore present a very small and highly selective sample of the rock mass from which were removed. In a typical engineering project, the samples tested in the laboratory represent only a very small fraction of one percent of the volume of the rock mass. In this paper, we calculate the representative orientation of the resultant vector, the measure of the degree of clustering, the volume of rock mass, the trace length of discontinuity spacing under underlying distributions. And we generate the random fracture networks using real data. We propose the calculating the trace length.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.2
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• pp.119-125
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• 2004

The direction component uses mainly the sobel and FFT method. The sobel method is difficult to set representative direction when we wish to extract representative direction when we wish to extract representative direction component and the complicated processing process of sobel mask because same value appears in the low provision image or high provision image and we cannot accumulate tilt size in case of making accumulate after making unit vector to pixel. The method that uses FFT conversion for direction extraction is possible in case that ridge has correct direction specification and must use a special direction filter. After thinning the binary image to supplement above weak point in the paper, we extract direction component by pixel unit, and we extract the most direction components of pixel that exist in block of 8${\times}$8 pixels size as representative direction of ridge.

• Economic and Environmental Geology
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• v.47 no.2
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• pp.121-131
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• 2014

The stability of rock slope is mainly controlled by the orientation and shear strength of discontinuties in rock mass. Therefore, in kinematic analysis, the orientation of the combination of discontinuities and slope face is examined to determine if certain modes of failure can be occurred. In previous kinematic analysis, a representative orientation of the slope face and mean orientation of discontinuity set were used as input parameters. However, since the orientations of slope face varies according to locations of measurement, the representative slope face orientation could cause misunderstanding for kinematic instability. In addition, since the orientations of each discontinuity are scattered in the same discontinuity set, there is the possibility that uncertainties are involved in the procedure of kinematic analysis. Therefore, in this study, the detailed digital topographic map was used to obtain the orientation of slope face. In addition, the probabilistic analysis approach was utilized to deal properly with the uncertainties in discontinuity orientation. The proposed approach was applied to steep slopes in mountain road located in Baehuryeong, Chunncheon city, Gangwon-Do. The analysis results obtained from the deterministic and probabilistic analysis were compared to check the feasibility of proposed the analysis.

• Broadcasting and Media Magazine
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• v.27 no.2
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• pp.19-25
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• 2022

본 고에서는 최근 컴퓨터 비전 분야에서 가장 활발히 연구되고 있는 분야 중에 하나인 자가 학습(Self-supervised Learning) 기술의 동향과 향후 방향성에 대해서 논의한다. 컴퓨터 비전 분야에서의 자가 학습 기술은 최근에 Contrastive Learning 기법을 활용하여 활발하게 연구되고 있는데, 이를 위한 좋은 Positive와 Negative를 어떻게 추출할까에 대한 고민으로 수많은 연구들이 진행되어 왔다. 본 고에서는 이러한 방향성에서 대표적인 몇 가지의 방법론에 대해서 논의하고 이의 한계점을 언급하며 컴퓨터 비전 분야에서 자가 학습 기법이 가야 할 방향성에 대해서 논의하고자 한다.