비등방성 확산을 이용한 노이즈에 강인한 영상 분할 기법

MasterImage segmentation is to partition the image scene into meaningful or perceptually similar regions. This field has been applied to several applications such as the computer vision which identifies objects in a sequence of images, detection and measurement of a malignant tumor in medical image and 2D to 3D depth map generation. The goal of image segmentation is to represent an image scene into more meaningful and easier to analyze. Several image segmentation algorithms have been proposed. Also, these methods can be divided into following categories, based on two properties of image. First, detecting discontinuities based method which means to partition an image into contour based on abrupt changes in intensity, like an edge detection method. Second, detecting similarities which means to partition an image into region based on similarities such as color, intensity, and texture. However, these segmentation strategies have common problem such as over-segmentation induced by noise and texture image. For object base segmentation, the main elements causing over-segmentation should be eliminated. Therefore, the method which makes the input image a homogeneous one is demanded.This thesis proposed noise-robust image segmentation algorithm for object segmentation: the adaptive anisotropic diffusion (AD) model for removing the noise and texture, and histogram based K-means clustering (HKMC) using principal component analysis (PCA). The adaptive AD model performs noise removing and de-texturing process for making input image into a color image without texture by adaptively adjusting the conduction thresholding value K. The proposed HKMC method using PCA precisely separates the inter regions through projection to the principal axis which has shown maximum varianceIn the experiments using the Berkeley Segmentation Dataset (BSDS (500)), probabilistic rand index (PRI) and segmentation covering (SC) scores are used for evaluating the segmentation quality. For evaluating the proposed algorithm, experiments can be performed to verify the effectiveness of pre-processing and PCA: to verify the performance of the pre-processing (adaptive AD) step, the original benchmark segmentation results were compared to benchmark results with proposed pre-processing. When applied the pre-processing, the average PRI was improved by up to 0.7%, 0.65% and 0.2% in terms of 5, 7, 10% noise standard deviation, and the average SC was improved by up to 3.3%, 3.4% and 5.5% in terms of 5 ,7, 10% noise standard deviation. To show the effectiveness of segmentation algorithm using PCA, the HKMC with adaptive AD model was compared to proposed algorithm. The segmentation result between HKMC with adaptive AD and proposed algorithm showed a difference of segmentation accuracy. In the PRI and SC, the propose method showed the better performance 0.3~0.8% and 4.2~5.7%, respectively, than the HKMC with adaptive AD

The Conscientious objection movement in South Korea as a peace movement

학위논문(석사) --서울대학교 대학원 :사회학과,2009.2.Maste

유기재배와 관행재배 사과 과수원 간의 절지동물 군집 비교

학위논문(박사) -- 서울대학교대학원 : 농업생명과학대학 농생명공학부, 2022. 8. 이승환.Apple is grown as a long-term perennial and plays an essential role in preserving agricultural biodiversity. Farming systems, organic and conventional, may have a different effect on arthropod communities. The present study surveyed arthropod communities by pitfall traps, yellow sticky traps, and leave sampling in organic and conventional apple orchards in four different areas. A total of 319,943 arthropod individuals, except for spiders, were Acari, Collembola, and Insecta, identified as 255 species in 81 families belonging to 12 orders. The abundance of arthropods in organic orchards was significantly higher than that in conventional orchards by the farming system. Six orders (Acari, Collembola, Coleoptera, Diptera, Hemiptera, and Hymenoptera) were dominant in relative species richness and abundance. The six families, Ceratozetidae (Acari), Entomobryidae (Collembola), Carabidae and Staphylinidae (Coleoptera), Diapriidae, and Formicidae (Hymenoptera) were statistically different between the farming systems. Three dominant species, Aleochara curtula in Staphylinidae, Nylanderia flavipe in Formicidae, and Diapriidae sp.1 in Diapriidae showed statistical differences higher in an organic orchard. As a result of analyzing the similarity of arthropod community structure, it was generally clustered depending on the study area, regardless of the farming system. Arthropods were collected during the survey and categorized into five ecological guilds; Detritivores, Herbivores, Pollinators, Predators, and Parasitoids. All five guilds appeared regardless of the survey area and farming system. According to the farming system, the abundance of detritivores, herbivores, predators, and parasitoids was statistically significantly higher in organic orchards. As a result of analyzing the similarity of the arthropod guild structure, it was generally clustered into each farming system. Overall, the species richness, abundance, and diversity index of arthropod communities were conspicuously higher in organic orchards than in conventional orchards. However, arthropod guild diversity was statistically higher in conventional orchards. In the seasonal fluctuations in the biodiversity of arthropod communities, the species richness and the abundance showed a mountain-shaped with one peak in the middle of the survey, while species diversity was observed in multiple peaks. A total of 4,663 spiders were collected during the survey and identified as 94 species in 70 genera belonging to 21 families. The species richness and abundance of spiders in organic orchards were significantly higher than in conventional orchards. Five families (Thomisidae, Lycosidae, Linyphiidae, Gnaphosidae, and Nesticidae) were dominant in species richness and abundance regardless of the study area or farming system, and Lycosidae and Linyphiidae were very remarkable among the dominant families. Five dominant species, Erigone prominens in Linyphiidae, Pardosa astrigera, Pardosa laura, Piratula procurvus, and Trochosa ruricola in Lycosidae, showed statistical differences higher in an organic orchard. As a result of analyzing the similarity of the spider community structure, it was generally clustered into each farming system. Spiders were collected during the survey period and categorized into eight ecological guilds. Of the eight categorized spider guilds, four guilds, ground runners, space web builders, wandering sheet weavers, and wandering sheet web builders, were dominant guilds in apple orchards. Ground runners and wandering sheet weavers were statistically higher in organic orchards, whereas wandering sheet web builders were statistically higher in conventional orchards. As a result of analyzing the similarity of the spider guild structure, it was generally clustered into each farming system. Overall, the species richness, abundance, and diversity index of spider communities were conspicuously higher in organic orchards. However, guild richness and diversity were not different between farming systems. In the seasonal fluctuations in the biodiversity of spider communities, the species richness and the abundance showed a mountain-shaped curve with a peak in the middle of the survey, and in the case of species diversity, multiple peaks were observed. The seasonal fluctuations in the biodiversity of spider guilds were observed with similar results to that of spider communities. Regardless of the farming system, 27 species collected from all surveyed apple orchards were determined as the main arthropod species of Korean apple orchards, and their abundance was statistically high in the organic apple orchards.사과는 다년생 작물로 농업생태계의 생물다양성을 유지하는데 중요한 역할을 하고 있다. 유기농과 관행농의 영농 방식은 절지동물 군집에 다른 영향을 미칠 수 있다. 본 연구는 4개의 다른 지역의 유기농과 관행농 사과원에서 함정트랩, 황색점착트랩, 사과잎 조사를 통하여 절지동물 군집을 조사하였다. 거미류를 제외한 응애류, 톡토기류, 곤충류의 국내 절지동물 군집은 12목 81과 255종 319,943 개체로 조사되었다. 전체 절지동물 군집의 풍부도는 유기농에서 높았으며 응애강, 톡토기목, 딱정벌레목, 파리목, 노린재목, 벌목이 상대적인 종수와 풍부도가 높은 우점목으로 조사되었다. 응애강의 잔날개응애과, 톡토기목의 털보톡토기과, 딱정벌레목의 딱정벌레과, 반날개과, 파리목의 파리과, 검정날개버섯파리과, 벌목의 염주벌과, 개미과는 사과원의 우점과로 조사되었으며 영농 방식 간에 통계적 유의차를 보였다. 우점종으로 조사된 반날개과의 홍딱지바수염반날개, 개미과의 스미스개미, 그리고 염주벌과의 염주벌류 sp.1은 유기농에서 통계적으로 높은 풍부도를 나타내었다. 절지동물 군집 구조의 유사도 분석 결과, 영농 방식과 상관없이 지역에 따라 군집화 되었다. 조사기간 동안 채집된 절지동물은 분해자, 식식자, 화분매개자, 포식자, 기생포식자의 5개 생태학적 길드로 분류하였다. 5개 길드는 영농 방식에 상관없이 모든 사과원에서 조사되었다. 분해자, 식식자, 포식자, 기생포식자의 풍부도는 유기농 사과원에서 유의하게 높았다. 영농 방식에 따른 절지동물 길드 구조의 유사도 분석 결과, 대체적으로 영농 방식에 따라 군집화 됨을 확인하였다. 전반적으로 절지동물 군집의 종수, 풍부도, 다양도 지수는 관행 사과원 대비 유기농 사과원에서 현저히 높았다. 그러나 절지동물 길드의 다양도 지수는 관행농 사과원에서 통계적으로 높았다. 절지동물 군집의 생물다양성 변동에서 종수와 풍부도는 조사 중간에 한번의 정점이 있는 산형 형태를 보인 반면, 종 다양도는 여러 개의 정점이 관찰되었다. 조사기간 동안 총 4,663 개체의 거미가 채집되었으며 21과 70속 94종으로 동정되었다. 영농 방식에 따라 유기사과원 거미의 풍부도는 관행사과원보다 통계적으로 높았다. 5개 과(게거미과, 늑대거미과, 접시거미과, 수리거미과, 굴아기거미과)는 조사 지역과 영농 방식에 상관없이 상대적인 종수와 풍부도가 높았는데 특히 늑대거미과와 접시거미과는 다른 우점과보다 두드러졌다. 접시거미과의 흑갈톱날애접시거미, 늑대거미과의 별늑대거미, 가시늑대거미, 좀늑대거미, 촌티늑대거미의 풍부도는 유기농에서 통계적으로 높았다. 영농 방식에 따른 거미 군집 구조의 유사도 분석 결과, 대체적으로 영농 방식에 따라 군집화 됨을 확인하였다. 조사기간 채집된 거미를 8개의 생태 길드로 분류하였다. 8개 거미 길드 중 ground runners, space web builders, wandering sheet weavers, wandering sheet web builders는 사과원의 우점길드로 확인되었다. Ground runners와 wandering sheet weavers는 유기농 사과원에서 풍부도가 통계적으로 높았던 반면, wandering sheet web builders는 관행농에서 통계적으로 높았다. 영농 방식에 따른 거미 길드의 유사성 분석 결과, 대체적으로 영농 방식에 따라 군집화 됨을 확인하였다. 전반적으로 거미 군집의 종수, 풍부도, 다양도 지수는 유기농에서 현저히 높았다. 그러나, 길드의 종수와 다양도 지수는 영농 방식 간에 차이가 없었다. 거미 군집의 생물다양성 계절적 변동에서 종수와 풍부도는 조사 중간에 1번의 정점을 갖는 산형 곡선을 보였고 종 다양도는 여러 개의 정점이 관찰되었다. 거미 길드의 생물다양성 계절적 변동은 거미 군집의 결과와 유사한 양상을 보였다. 영농 방식과 상관없이 모든 조사 지역의 사과원에서 채집된 절지동물은 총 27 종으로 이들을 한국 사과원의 주요 종으로 정하였으며 이들의 풍부도를 종합하여 비교한 결과, 유기농 사과원에서 통계적으로 높았다.Ⅰ. Introduction 1 1. Definition of organic farming 2 2. Characteristics of orchard ecosystem 3 3. Status of studies on pest control in Korean apple orchard 5 4. Current status of organic apple cultivation 7 5. Arthropod community structure in apple orchards 9 6. Ecological guild structure in apple orchards 10 7. Biodiversity of arthropod communities and guilds in apple orchards 13 8. Purpose of this present study 15 Ⅱ. Materials and methods 16 1. Orchards selection 17 2. Farming practice information 21 3. Above-ground sampling 23 4. Ground sampling 24 5. Taxonomical identification 26 6. Guilds identification 27 7. Data analysis 28 Ⅲ. Results 30 Section ⅰ. Comparison of arthropod community structure in organic and conventional apple orchards 31 1. Arthropods (Acari, Collembola, and Insecta) communities 31 2. Spider communities 71 3. The main arthropod species in Korean apple orchard 99 Section ⅱ. Comparison of ecological guild structure between organic and conventional apple orchards 103 1. Arthropods (Acari, Collembola, and Insecta) guilds 103 2. Spider guilds 120 Section ⅲ. Comparison of biodiversity of arthropod communities and guilds in organic and conventional orchards 136 1. Arthropod (Acari, Collembola, and Insecta) communities and guilds 136 2. Spider communities and guilds 148 Ⅳ. Discussion 160 References 175 Appendices 201 Abstract in Korean 220박

Development of high density DNAchip for SNP detection

Maste

Per-pixel Blur Kernel Estimation Network

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간질환자의 말초혈액 단핵세포에서의 P-당단백질 기능항진에 관한 연구

Thesis(masters) --서울대학교 대학원 :의학과 (뇌신경과학전공),2009.2.Maste

流通市場改放의 産嶪組織論的 效果 분석 : 構造-行動-成果 분석을 中心으로

학위논문(석사)--서울대학교 행정대학원 :행정학과 행정학전공,1998.Maste

Optimal capacity calculation of STATCOM and Shunt capacitor considering Installation Cost and Operation Loss in Wind Farm

학위논문(석사) --서울대학교 대학원 :전기. 컴퓨터공학부,2010.2.Maste

재가상화, 탈가상화를 이용한 베어메탈 시스템에서의 체크포인트-회복 기법

학위논문(석사) - 한국과학기술원 : 전산학부, 2016.2 ,[v, 24 p. :]Virtualization technique improves management capabilities in computer systems such as live migra- tion and checkpoint. However, there are many applications which are well fitted to bare-metal system because of their certain demands. As these applications do not use virtualization, they cannot benefit from the management capabilities of virtualization. To support management capabilities in bare-metal systems, we design and implement re-virtualization and de-virtualization techniques in an x86 architec-ture without operating system modification. We a insert transient virtualization layer into a bare-metal system using re-virtualization. This layer makes the bare-metal system takes advantage of management capabilities. After using management capabilities, our system removes the virtualization layer to main-tain bare-metal performance. In this paper, we describe the design and implementation of the re- and de virtualization techniques, and present a checkpoint-recovery system that can recover from operating system failures by exploiting re- and de-virtualization.한국과학기술원 :전산학부

3D depth 추출을 위한 영상 분할 기술에 관한 연구

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