• 한국도로학회논문집
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• 제10권2호
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• pp.221-227
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• 2008

고속도로 합류부 지점의 감응식 루프 검지기를 통한 정보 수집의 질은 검지기의 설치 위치와 관련이 있다. 검지기로부터 얻은 교풍자료들은 안정된 교통의 흐름과 높은 안전 수준을 유지하게 위해 필수적으로 사용된다. 또한, 이러한 정보는 교통관리전략 위한 입력 자료로도 사용된다. 본 연구에서는 대표적인 교통관리 전략중 하나인 램프 미터링의 효과를 극대화하기 위해 고속도로 합류부에서의 검지기 최적 설치 위치를 통계기법을 이용하여 산정하였고, 주요한 분석도구로써 미시적 교통 시뮬레이션 모형인 PARAMICS를 사용하였다. 검지기 설치 위치 산정은 통계분석을 통해 도로 구간 별 교통류 특성에 매우 의존하고 있음을 규명하였다.

• Journal of the Korean Wood Science and Technology
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• 제37권6호
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• pp.556-565
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• 2009

제재목 육안등급판정 자동화시스템은 정확한 입력 화상이 요구된다. 이송 중인 재장 3.6 m의 국내산 소나무의 제재목 화상을 생성시키기 위해서 영역카메라를 이용하여 부분 화상을 획득하였고 2종류의 템플릿 위치지정법과 6가지의 템플릿 크기 조건을 적용하여 병합하였다. 특징영역 추출법이 템플릿 고정법에 비해 병합 성능이 우수하였다. 길이오차의 발생 요인은 명도차이, 특정 패턴, 템플릿 크기 등에 의한 유사도 하락에 있었다. 부정합은 길이가 길고 반복적인 목리에서 주로 발생하였다. 템플릿 크기는 6가지 템플릿 종류 중에 크기가 가장 작은 $100{\times}100$ 화소가 가장 병합 성능이 우수하였다. 병합 성능을 향상시키기 위해서는 정밀한 템플릿의 크기 선정과 명도 차이를 감소시킬 수 있는 화상병합 전처리에 대한 연구가 요구된다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.392-394
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• 2003

There is a well-known simple, stable standard merge algorithm, which uses only linear time but for the price of double space. This extra space consumption has been often remarked as lack of the standard merge sort algorithm that covers a merge process as central operation. In-place merging is a way to overcome this lack and so is a topic with a long tradition of inspection in the area of theoretical computer science. We present an in-place merging algorithm that rear-ranges the elements to be merged by rotation, a special form of block interchanging. Our algorithm is novel, due to its technique of determination of the rotation-areas. Further it has a short and transparent definition. We will give a presentation of our algorithm and prove that it needs in the worst case not more than twice as much comparisons as the standard merge algorithm. Experimental work has shown that our algorithm is efficient and so might be of high practical interest.

• 천문학회보
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• 제37권1호
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• pp.41.2-41.2
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• 2012

It has been suggested that merging plays an important role in the formation and the evolution of early-type galaxies (ETGs). Optical-NIR color gradients of ETGs in high density environments are found to be less steep than those of ETGs in low density environments, hinting frequent merger activities in ETGs in high density environments. In order to examine if the flat color gradients are the result of dry mergers, we studied the relations between merging features, luminosities, environments and color gradients of 196 low redshift ETGs selected from Sloan Digital Sky Survey (SDSS) Stripe82. Near Infrared (NIR) images are taken from UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Color (r-K) gradients of ETGs with tidal features are a little flatter than relaxed ETGs, but not significant. We found that massive (> 10^11.3 solar masses) ETGs have -40% less scattered color gradients than less massive ETGs. The less scattered color gradients of massive ETGs could be evidence of dry merger processes in the evolution of massive ETGs. We found no relation between color gradients of ETGs and their environments.

• 천문학회보
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• 제36권1호
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• pp.57.1-57.1
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• 2011

It has been suggested that merging plays an important role in the formation and the evolution of early-type galaxies (ETGs). Optical-NIR color gradients of ETGs in high density environments are found to be less steep than those of ETGs in low density environments, hinting frequent merger activities in ETGs in high density environments. In order to examine if the flat color gradients are the result of dry mergers, we studied the relations between merging features, color gradient, and environments of 281 low redshift ETGs selected from Sloan Digital Sky Survey (SDSS) Stripe82. The sample contains 222 relaxed ETGs, 38 ETGs with tidal features, 10 galaxies with dust features and 11 galaxies with tidal and dust features, and Near Infrared (NIR) images are taken from UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). We find that r-K color gradients of field sample galaxies are steeper than those of sample ETGs within cluster environments. For the field sample galaxies, a relatively large number of galaxies with peculiar features contribute to the steeper color gradients, while the absence of these peculiar early-type galaxies make color gradients of the cluster sample galaxies intact. In high density environment, ETGs are already evolved and relaxed, resulting flat color gradients. However, in low density environments, a majority of ETGs undergone merging recently which makes the color gradients steep.

• 대한원격탐사학회지
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• 제27권6호
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• pp.717-728
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• 2011

An efficient method for the unsupervised classification of high resolution imagery is suggested in this paper. It employs pixel-linking and merging based on the adjacency graph. The proposed algorithm uses the neighbor lines of 8 directions to include information in spatial proximity. Two approaches are suggested to employ neighbor lines in the linking. One is to compute the dissimilarity measure for the pixel-linking using information from the best lines with the smallest non. The other is to select the best directions for the dissimilarity measure by comparing the non-homogeneity of each line in the same direction of two adjacent pixels. The resultant partition of pixel-linking is segmented and classified by the merging based on the regional and spectral adjacency graphs. This study performed extensive experiments using simulation data and a real high resolution data of IKONOS. The experimental results show that the new approach proposed in this study is quite effective to provide segments of high quality for object-based analysis and proper land-cover map for high resolution imagery of urban area.

• 전기학회논문지
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• 제60권5호
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• pp.1023-1029
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• 2011

In the industrial vision systems, image correction has great influence on the overall performance of measurement or inspection. The overall area of distorted image is usually splitted into small control areas, and each area is corrected by its control points. The performance of correction methods using control points can be improved by reduction of control areas because the computational time and memory highly depend on the number of control areas. We develop a merging algorithm that reduces control areas and preserves the correction accuracy. The algorithm merges the splitted control areas by use of quad tree method. Experimental results are presented to verify the usefulness of the proposed method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.1463-1466
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• 1987

The problem of generating minimal area CMOS functional cell layout can be converted to that of decomposing the transistor connection graph into a minimum number of subgraphs, each having a pair of Euler paths with the same sequence of input labels on the N-graph and P-graph, which are portions of the graph corresponding to NMOS and PMOS parts respectively. This paper proposes a heuristic algorithm which yields a nearly minimal number of Euler paths from the path representation formula which represents the give a logic function. Subpath merging is done through a list processing scheme where the pair of paths which results in the lowest cost is successively merged from all candidate merge pairs until no further path merging and further reduction of number of subgraphs are possible. Two examples were shown where we were able to further reduce the number of interlaces, i.e., the number of non-butting diffusion islands, from 3 to 2, and from 2 to 1, compared to the earlier work [1].

• 한국멀티미디어학회논문지
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• 제19권7호
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• pp.1116-1126
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• 2016

Image segmentation is widely used in the pre-processing stage of image analysis and, therefore, the accuracy of image segmentation is important for performance of an image-based analysis system. An efficient image segmentation method is proposed, including a filtering process for super-pixels, improved saliency map information, and a merge process. The proposed algorithm removes areas that are not equal or of small size based on comparison of the area of smoothed superpixels in order to maintain generation of a similar size super pixel area. In addition, application of a bilateral filter to an existing saliency map that represents human visual attention allows improvement of separation between objects and background. Finally, a segmented result is obtained based on the suggested merging process without any prior knowledge or information. Performance of the proposed algorithm is verified experimentally.

• 한국ITS학회 논문지
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• 제19권2호
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• pp.62-73
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• 2020

도로연결허가는 위계가 높은 도로의 접근성을 제한함으로서 높은 속도로의 지역 간 광역 이동성을 보존하기 위한 제도이다. 이미 도시화가 진행되어 도로의 이동성이 상실된 지역에서 과도하게 긴 변속차로 길이요구로 인해 토지의 접근성이 악화되므로 향상된 차량 가속성능을 반영하여 변속차로 최소길이를 재검토해야한다는 요구가 제시된다. 그러나 변속차로 최소길이 요건을 재검토하기 위해서는 저속에서 본선으로 합류하는 차량이 본선에 미치는 영향을 정확히 파악하는 것이 필요하다. 이를 위하여 본선의 교통류율, 가속차로 내 도달속도에 따라서 도로연결시설 진출차량 1대가 본선에 유발하는 총 지체를 분석하였다. 본선의 교통류율과 총 지체는 정확한 선형관계를 가지고 있는 것이 확인되었으며, 도로연결 시설에서 진출한 차량의 본선 합류속도가 40km/h부터 100km/h까지 20km/h간격으로 증가함에 따라 각각 약 5.0배, 1.6배, 5.1배 감소하였다. 가속차로 내 차량이 본선과 동일한 속도로 가속하여 합류할 경우 유발하는 총 지체가 0.5대·시 이하로 가장 이상적이지만, 운전자의 인지반응속도 1초를 감안할 때 본선과 약 20km/h이내의 속도편차를 가지고 합류할 경우 본선에 유발하는 총 지체는 미미한 것으로 판단되었다.