• 제목/요약/키워드: Large-Scale Volume Data

검색결과 94건 처리시간 0.029초

3D Segmentation for High-Resolution Image Datasets Using a Commercial Editing Tool in the IoT Environment

  • Kwon, Koojoo;Shin, Byeong-Seok
    • Journal of Information Processing Systems
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    • 제13권5호
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    • pp.1126-1134
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    • 2017
  • A variety of medical service applications in the field of the Internet of Things (IoT) are being studied. Segmentation is important to identify meaningful regions in images and is also required in 3D images. Previous methods have been based on gray value and shape. The Visible Korean dataset consists of serially sectioned high-resolution color images. Unlike computed tomography or magnetic resonance images, automatic segmentation of color images is difficult because detecting an object's boundaries in colored images is very difficult compared to grayscale images. Therefore, skilled anatomists usually segment color images manually or semi-automatically. We present an out-of-core 3D segmentation method for large-scale image datasets. Our method can segment significant regions in the coronal and sagittal planes, as well as the axial plane, to produce a 3D image. Our system verifies the result interactively with a multi-planar reconstruction view and a 3D view. Our system can be used to train unskilled anatomists and medical students. It is also possible for a skilled anatomist to segment an image remotely since it is difficult to transfer such large amounts of data.

Extraction of similar XML data based on XML structure and processing unit

  • Park, Jong-Hyun
    • 한국컴퓨터정보학회논문지
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    • 제22권4호
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    • pp.59-65
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    • 2017
  • XML has established itself as the format for data exchange on the internet and the volume of its instance is large scale. Therefore, to extract similar information from XML instance is one of research topics but is insufficient. In this paper, we extract similar information from various kind of XML instances according to the same goal. Also we use only the structure information of XML instance for information extraction because some of XML instance is described without its schema. In order to efficiently extract similar information, we propose a minimum unit of processing and two approaches for finding the unit. The one is a structure-based method which uses only the structure information of XML instance and another is a measure-based method which finds a unit by numerical formula. Our two approaches can be applied to any application that needs the extraction of similar information based on XML data. Also the approach can be used for HTML instance.

우리나라 비상사태시 소요물동량 및 선종별 소요선대 추정 연구 (A Study on the Estimation of Required Seaborne Trade Volume and Carrier Volume of Each Vessel Type in Case of Emergency)

  • 안영균
    • 무역학회지
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    • 제45권1호
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    • pp.1-11
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    • 2020
  • The maritime industry is important for Korean international trade, as more than 99 percent of its imports and exports are moved by maritime transportation. However, if maritime transportation is stopped in the event of an emergency, such as war or natural disaster, there is a danger that imports and exports may cease abruptly. Coping with this risk is why the Ministry of Oceans and Fisheries, manages the 'National Necessary Shipping System.' This system requires that the government estimates the size of ships necessary in the case of an emergency, and the ships designated as National Necessary Vessels should transport goods in the case of actual emergencies. This study seeks to estimate the appropriate size of ships required in an emergency using the latest data and applying a quantitative methodology. This study provides useful reference materials for policy authorities. In particular, it is meaningful that this study estimates the required number of ships of each vessel type, reflecting the recent trend of large-scale ships and expanding global trade.

대용량 위성영상 처리를 위한 FAST 시스템 설계 (FAST Design for Large-Scale Satellite Image Processing)

  • 이영림;박완용;박현춘;신대식
    • 한국군사과학기술학회지
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    • 제25권4호
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    • pp.372-380
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    • 2022
  • This study proposes a distributed parallel processing system, called the Fast Analysis System for remote sensing daTa(FAST), for large-scale satellite image processing and analysis. FAST is a system that designs jobs in vertices and sequences, and distributes and processes them simultaneously. FAST manages data based on the Hadoop Distributed File System, controls entire jobs based on Apache Spark, and performs tasks in parallel in multiple slave nodes based on a docker container design. FAST enables the high-performance processing of progressively accumulated large-volume satellite images. Because the unit task is performed based on Docker, it is possible to reuse existing source codes for designing and implementing unit tasks. Additionally, the system is robust against software/hardware faults. To prove the capability of the proposed system, we performed an experiment to generate the original satellite images as ortho-images, which is a pre-processing step for all image analyses. In the experiment, when FAST was configured with eight slave nodes, it was found that the processing of a satellite image took less than 30 sec. Through these results, we proved the suitability and practical applicability of the FAST design.

계층 자료구조의 결합과 3차원 클러스터링을 이용하여 적응적으로 부하 균형된 GPU-클러스터 기반 병렬 볼륨 렌더링 (Adaptive Load Balancing Scheme using a Combination of Hierarchical Data Structures and 3D Clustering for Parallel Volume Rendering on GPU Clusters)

  • 이원종;박우찬;한탁돈
    • 한국정보과학회논문지:시스템및이론
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    • 제33권1_2호
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    • pp.1-14
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    • 2006
  • 대용량 볼륨 데이타를 가시화하는 효과적인 방법인 후-정열 병렬 렌더링은 부하균형에 의해 성능이 결정된다. 기존의 정적 데이타 분할 방법은 태스크 병렬성만의 관점에서는 자기균형을 쉽게 얻을 수 있었지만, 데이타 내부의 빈 공간을 고려하지 않았기 때문에 데이타 병렬성의 관점에서는 심각한 불균형을 초래할 수 있었다. 본 논문은 태스크 병렬성과 데이타 병렬성이 함께 고려된, 적응적이며 확장적인 부하 균형 기법을 제안한다. 우리는 계층적 자료 구조인 옥트리와 BSP-트리를 효과적으로 결합하여 볼륨 데이타의 실제 영역만을 추출하여 렌더링 노드들로 균등하게 분산시켰으며, 각 렌더링 노드들에서는 3차원 클러스터링 알고리즘을 적용하여 렌더링 순서를 효과적으로 결정하였다. 제안하는 방법은 기존의 정적 데이타 분산 기법에 비해 최대 22배의 병렬성을 높였고 동기화 비용을 낮추어 렌더링 성능을 크게 향상시켰음을 실험을 통해 알 수 있었다.

모바일 볼륨 가시화 시스템 개발 (Development of Mobile Volume Visualization System)

  • 박상훈;김원태;임인성
    • 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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    • 제12권5호
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    • pp.286-299
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    • 2006
  • 모델링 시뮬레이션 그리고 센서 장비 기술의 지속적인 발전으로 최근에 매우 높은 해상도를 갖는 방대한 크기의 볼륨 데이타들이 일반화되고 있다. 과학적 가시화 분야에서, 이러한 데이타를 고성능 병렬 컴퓨터를 사용하여 효과적으로 가시화하기 위한 다양한 대화식 실시간 기법들이 제안되어 왔다. 본 논문에서는 모바일 클라이언트, 게이트웨이, 병렬 렌더링 서버로 구성되는 모바일 볼륨 가시화 시스템의 개발에 관해 설명한다. 모바일 클라이언트는 병렬 렌더링 서버에게 전달할 렌더링 / 뷰잉 파라미터를 설정할 수 있는 기능뿐만 아니라, 관심이 있는 특정 영역을 점진적으로 높은 해상도의 영상을 이용해 탐색할 수 있는 기능을 제공한다. 게이트웨이는 안정적인 서비스를 위해 모바일 클라이언트와 병렬 렌더링 서버 사이에서 주고받는 요청과 응답을 관리하는 역할을 한다. 병렬 렌더링 서버는 클라이언트로부터 전달받은 렌더링 컨텍스트를 이용하여 정의된 특정 부분 볼륨을 가시화하고, 고해상도의 최종 영상을 클라이언트에게 되돌려 주는 작업을 수행한다. 제안된 시스템은 PDA를 갖고 있는 여러 사용자가 협력작업(CSCW) 모드를 통해 동시에 볼륨 데이타 가운데 공통으로 관심을 갖는 특정 부분, 렌더링 컨텍스트, 그리고 최종 영상을 공유할 수 있도록 설계되었다.

Gated Multi-channel Network Embedding for Large-scale Mobile App Clustering

  • Yeo-Chan Yoon;Soo Kyun Kim
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제17권6호
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    • pp.1620-1634
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    • 2023
  • This paper studies the task of embedding nodes with multiple graphs representing multiple information channels, which is useful in a large volume of network clustering tasks. By learning a node using multiple graphs, various characteristics of the node can be represented and embedded stably. Existing studies using multi-channel networks have been conducted by integrating heterogeneous graphs or limiting common nodes appearing in multiple graphs to have similar embeddings. Although these methods effectively represent nodes, it also has limitations by assuming that all networks provide the same amount of information. This paper proposes a method to overcome these limitations; The proposed method gives different weights according to the source graph when embedding nodes; the characteristics of the graph with more important information can be reflected more in the node. To this end, a novel method incorporating a multi-channel gate layer is proposed to weigh more important channels and ignore unnecessary data to embed a node with multiple graphs. Empirical experiments demonstrate the effectiveness of the proposed multi-channel-based embedding methods.

수치표고모형을 이용한 난지도 쓰레기 매립장의 이용계획에 관한 연구 (A Study on Utilization Plan of Nangido Landfill Using Digital Elevation Model)

  • 이재기;조재호;이현직;이인성
    • 한국측량학회지
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    • 제11권1호
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    • pp.19-27
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    • 1993
  • 대규모 쓰레기 매립장의 신설계획을 추진하기 위해서는 기존 매립장의 이용상태에 대한 정확한 현황분석을 통해 이용계획이 선행되어야 하며, 이를 위해 현 매립장의 쓰레기 매립양과 도시 경관 및 제반조건에 부합되는 여부를 파악하기 위해 현 매립상태에 대한 정확한 분석이 수반되어야 한다. 본 연구에서는 항공사진촬영에 의해 구축된 수치표고모형을 이용하여 현 쓰레기 매립상태 및 매립양의 정확한 분석을 수행하기 위해 지형분류에 따른 최고 자료보관방법과 면·체적결정방법을 결정함으로써, 현재 쓰레기 매립장의 장래 이용계획에 정확한 기초자료를 제공하는데 목적이 있다. 본 연구의 수행결과 대상지역의 지형분류를 객관적으로 수행하기 위한 알고리즘을 정립하였으며, 표본자료에 대해 각 지형의 최적보관법과 면· 체적결정방법을 결정하였다. 또한 이와 같이 얻어진 결과를 난지도 쓰레기 매립장에 적용함으로써 매립현황 및 매립가능량을 분석할 수 있었다.

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Development of a Software Program for the Automatic Calculation of the Pulp/Tooth Volume Ratio on the Cone-Beam Computed Tomography

  • Lee, Hoon-Ki;Lee, Jeong-Yun
    • Journal of Oral Medicine and Pain
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    • 제41권3호
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    • pp.85-90
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    • 2016
  • Purpose: The aim of this study was to develop an automated software to extract tooth and pulpal area from sectional cone-beam computed tomography (CBCT) images, which can guarantee more reproducible, objective and time-saving way to measure pulp/tooth volume ratio. Methods: The software program was developed using MATLAB (MathWorks). To determine the optimal threshold for the region of interest (ROI) extraction, user interface to adjust the threshold for extraction algorithm was added. Default threshold was determined after several trials to make the outline of extracted ROI fitting to the tooth and pulpal outlines. To test the effect of starting point location selected initially in the pulpal area on the final result, pulp/tooth volume ratio was calculated 5 times with different 5 starting points. Results: Navigation interface is composed of image loading, zoom-in, zoom-out, and move tool. ROI extraction process can be shown by check in the option box. Default threshold is adjusted for the extracted tooth area to cover whole tooth including dentin, cementum, and enamel. Of course, the result can be corrected, if necessary, by the examiner as well as by changing the threshold of density of hard tissue. Extracted tooth and pulp area are reconstructed three-dimensional (3D) and pulp/tooth volume ratio is calculated by voxel counting on reconstructed model. The difference between the pulp/tooth volume ratio results from the 5 different extraction starting points was not significant. Conclusions: In further studies based on a large-scale sample, the most proper threshold to present the most significant relationship between age and pulp/tooth volume ratio and the tooth correlated with age the most will be explored. If the software can be improved to use whole CBCT data set rather than just sectional images and to detect pulp canal in the original 3D images generated by CBCT software itself, it will be more promising in practical uses.

Environmental dependence of AGN activity in the SDSS main galaxy sample

  • Kim, Minbae;Choi, Yun-Young;Kim, Sungsoo S.
    • 천문학회보
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    • 제40권1호
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    • pp.48.1-48.1
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    • 2015
  • We investigate the role of small-scale and large-scale environments in triggering nuclear activity of the local galaxies using a volume-limited sample with $M_r$ < -19.5 and 0.02 < z < 0.0685 from the Sloan Digital Sky Survey Data Release 7. To fix the mass of the supermassive black hole in its host galaxy, we limit the central velocity dispersion of the sample galaxies. The active galactic nuclei (AGN) host sample is composed of Type II AGNs identified with flux ratios of narrow emission lines with S/N > 6. In this study, we find that the AGN fraction of late-type host galaxies are commonly larger than of early type galaxies. The AGN fraction of host galaxy with late-type nearest neighbor starts to increase as the host galaxy approaches the virial radius of the nearest neighbor (about a few hundred kpc scale). Our result may support the idea that the hydrodynamic interaction with the nearest neighbor plays an important role in triggering the nuclear activity of galaxy. The early-type galaxies in high density regions show decline of AGN activity compared to ones in lower density regions, whereas the direction of the environmental dependence of AGN activity for late-type galaxies is rather opposite. We also find that the environmental dependence of star formation rate is analogous to one of AGN activity except in the high density region.

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