• Title, Summary, Keyword: LOD

Search Result 615, Processing Time 0.06 seconds

Establishing Required LOD and Positioning Accuracy for Indoor Spatial Information Applications in Public Administrative Works

  • Park, Junho;Lee, Jiyeong
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.35 no.2
    • /
    • pp.103-112
    • /
    • 2017
  • Due to the large size and high complexity of modern buildings, the interest and the studies about indoor spatial information are increasing. Previous studies related to indoor spatial information were mostly about relevant technologies, and the application of indoor spatial information has been less studied. In the present study, the public administrative work areas where indoor spatial information may be applied were identified by using a modified delphi technique. And the indoor LOD (Level of Detail) and indoor positioning accuracy for indoor spatial information applications considering user requirements was established as standards for efficiently establishing and providing services. The required LOD and positioning accuracy for services was established by reestablishing indoor LOD and positioning accuracy and classifying services with reference to those. The indoor LOD was reestablished from LOD 0 to 4 by focusing on service utilization and general recognition, and the positioning accuracy was reestablished in three levels by considering the accuracy of the present positioning technology and service utilization status.

A study on the analysis about practicality after publishing Linked Open Data: focused on National bibliography and RISS (국내 Linked Open Data 발행 후 활용에 관한 연구 - 국가서지와 RISS Linked Data를 중심으로 -)

  • Yi, Hyun Jung;Nam, Young Joon
    • Proceedings of the Korean Society for Information Management Conference
    • /
    • /
    • pp.109-114
    • /
    • 2014
  • Linked Data는 서로 분리돼 있는 데이터를 HTTP와 SPARQL을 이용하여 한 번에 질의하는 것이 가능하다. 많은 공공정보들이 여러가지 형식으로 공개되고 있지만 데이터의 재사용성을 높이고 공개된 다른 데이터들과의 활용도를 높이기 위해 Linked Open Data (LOD)로 발행되고 있다. 국내 LOD 중 국가서지 Linked Data와 RISS Linked Data를 중심으로 발행현황을 살펴보고 LOD 발행 후 외부자원과의 연결을 시도한 활용서비스에 대하여 점검하고 활용방안에 대해 고찰하였다. LOD 발행에 있어 SKOS, FOAF, DC 등과 같은 국제 표준용어집을 사용하여 연계 용이성을 확보하고 LOD 연계에 대한 실질적 활용과 운용경험을 공유할 수 있는 플랫폼의 중요성을 제안하였다. 또한 국내외 LOD 플랫폼을 통해 홍보 및 네트워크를 구성하는 노력과 기술적인 운용에 대한 가이드의 필요성을 제안하였다.

  • PDF

Localization of Quantitative Trait Loci for Bone Mineral Density on Chromosome 13 in the Mongolian Population

  • Seo, Soo-Hyun;Lim, Hae-Jeng;Ahn, Se-Jin;Lee, Joseph;Kim, Jong-Il
    • Genomics & Informatics
    • /
    • v.7 no.3
    • /
    • pp.152-158
    • /
    • 2009
  • Although the genetic basis for bone mineral density (BMD) has been studied by many groups so far, genes responsible for this complex trait has not been completely revealed. In order to localize quantitative trait loci (QTLs) for BMD variation in Asian population, the study was designed using a group of Mongolian population, a genetically closed population with a homogeneous lifestyle. BMD was measured at the left and right wrists and ankles using DEXA in 1,082 participants from 142 families. Genotyping of 13 polymorphic microsatellite markers on chromosome 13 (average spacing 8-9 cM) and two-point and multipoint linkage analysis were performed. In two-point linkage analysis, we identified two markers, D13S175 (6.03 cM) and D13S265 (68.73 cM) that had LOD scores greater than 1 for left ankle (LOD=2.09, LOD=1.49, respectively). We also found a marker D13S175 (6.03 cM) with a high LOD for left wrist (LOD=1.49) and the markers D13S265 (68.73 cM) and D13S217 (17.21 cM) for the right wrist (LOD= 1.82, LOD= 1.62, respectively). Among these significant marker regions, only two regions at 17 cM (13p11) and 65 cM (13q21) for the right wrist overlapped with major QTLs reported in following multipoint linkage analysis (LOD= 1.7549, LOD=1.4462, respectively). This study provides the possible evidence of the presence of QTLs affecting right wrist BMD in Mongolian populations on 13p11 and 13q21. Modest evidence was also found for genes affecting left ankle and left wrist BMD on 13p13.

A Study on Extension of Culture Contents Service Based on Linked Open Data: Focused on the K-Food Contents (LOD기반의 문화콘텐츠 정보서비스 확장에 관한 연구: K-Food 분야를 중심으로)

  • Yoo, Hyeon-Gyeong;Yuk, Hye-In;Han, Hee-Jung;Kim, Yong
    • Journal of the Korean Society for information Management
    • /
    • v.32 no.1
    • /
    • pp.109-134
    • /
    • 2015
  • In the Korean wave 3.0 age, it is needed to prepare how to globalize and hold Korean culture through development of various Korean wave culture contents from existing contents focused on media. The goal of this study is to establish the foundation for developing the various Korean wave culture contents as linking information about other culture contents as well as food culture by extending Korean culture contents service based on LOD. For this purpose, this study established and assorted the concept of food culture through the literature review and case study and analyzed the applicability of the services of food culture contents based on LOD. Futhermore, this study provides the basis on extension of Korean wave culture service and suggests the process of implementation of food culture LOD and service model.

Object Tracking And Elimination Using Lod Edge Maps Generated from Modified Canny Edge Maps (수정된 캐니 에지 맵으로부터 만들어진 LOD 에지 맵을 이용한 물체 추적 및 소거)

  • Park, Ji-Hun;Jang, Yung-Dae;Lee, Dong-Hun;Lee, Jong-Kwan;Ham, Mi-Ok
    • The KIPS Transactions:PartB
    • /
    • v.14B no.3
    • /
    • pp.171-182
    • /
    • 2007
  • We propose a simple method for tracking a nonparameterized subject contour in a single video stream with a moving camera and changing background. Then we present a method to eliminate the tracked contour object by replacing with the background scene we get from other frame. First we track the object using LOD (Level-of-Detail) canny edge maps, then we generate background of each image frame and replace the tracked object in a scene by a background image from other frame that is not occluded by the tracked object. Our tracking method is based on level-of-detail (LOD) modified Canny edge maps and graph-based routing operations on the LOD maps. We get more edge pixels along LOD hierarchy. Our accurate tracking is based on reducing effects from irrelevant edges by selecting the stronger edge pixels, thereby relying on the current frame edge pixel as much as possible. The first frame background scene is determined by camera motion, camera movement between two image frames, and other background scenes are computed from the previous background scenes. The computed background scenes are used to eliminate the tracked object from the scene. In order to remove the tracked object, we generate approximated background for the first frame. Background images for subsequent frames are based on the first frame background or previous frame images. This approach is based on computing camera motion. Our experimental results show that our method works nice for moderate camera movement with small object shape changes.

Improvement of Quantity Take-Off and BoQ through the LOD Criteria Analysis of BIM Models (BIM 모델 표현 수준(LOD) 분석을 통한 내역체계 개선방안 연구)

  • Choi, Hyunjun;Yun, Seokheon
    • Korean Journal of Construction Engineering and Management
    • /
    • v.20 no.6
    • /
    • pp.89-97
    • /
    • 2019
  • Recently, BIM has been actively introduced in construction projects. In particular, the introduction of BIM in cost estimating process is expected to improve the accuracy and efficiency of the cost estimate. However, the quantity calculation and BoQ documents preparation process still require manual work. Although the BIM model may support quantification process, it is still problematic that the level of detail of the model must be very detailed to meet the items in BoQ. To address this, it is necessary to analyse the LOD criteria and to analyze the extent to which quantity can be computed according to the level of detail in the BIM model. For the analysis of LOD-based work items, the work item grades were divided into A,B, and C. In this study, the ratio and cost of each item that can be calculated at the LOD level in the detailed design phase are reviewed for each type of work, and the method for improving the quantity calculation using BIM is proposed. In the LOD 300 stage(Detailed design stage), the largest number of items in the class B, the major improvement class, are window and glass work. In addition, the most expensive type of work was analyzed by reinforced concrete work. In the future, it is necessary to suggest appropriate improvement way for items with high item ratios and items with high cost ratios. The results of this study are expected to be used as a BIM-based cost estimation or as basic data for improving the current BoQ system.

A Study on the Extension of Disaster Safety Information Service based on Linked Open Data (LOD기반의 재난안전 정보서비스 확장에 관한 연구)

  • Kim, Tae-Young;Gang, Ju-Yeon;Kim, Hye-Young;Kim, Yong
    • Journal of the Korean Society for Library and Information Science
    • /
    • v.51 no.3
    • /
    • pp.163-188
    • /
    • 2017
  • This study aims to propose disaster safety information service model based on LOD for effective management and dissemination of the information. To achieve the aim of this study, current state of disaster safety information was analyzed through online search and face-to-face interviews, and then the information was divided into 6 types. Finally, this study proposed specific process of building disaster safety information LOD service with considerations reflecting the information characteristics. The process for building LOD was based on Guidelines for Building Linked Data written by National Information Society Agency. Especially, ontology concept model was defined by using standard lexical resources and modeling tools based on 6 types of disaster safety information, and classes and properties were proposed. The results of this study will make disaster safety information more useful for common people.

A Study on Saliency-based Stroke LOD for Painterly Rendering (회화적 렌더링을 위한 세일리언시 기반의 스트로크 단계별 세부묘사 제어에 관한 연구)

  • Lee, Ho-Chang;Seo, Sang-Hyun;Yoon, Kyung-Hyun
    • Journal of KIISE:Computer Systems and Theory
    • /
    • v.36 no.3
    • /
    • pp.199-209
    • /
    • 2009
  • In this paper, we suggest a stroke level of detail (LOD) based on a saliency density. On painter]y rendering, the stroke LOD has an advantage of making the observer concentrate on the main object and improving accuracy of expression. For the stroke LOD, it is necessary to classify the detailed and abstracted area. We divide the area on the basis of saliency distribution and the level of detailed expression is controlled based on the saliency information. 'We define that the area of which the saliency distribution is high is a major subject that an artist tries to express, it is described in detail. The area of which the saliency distribution is low is abstractly described. Each divided area has the abstraction level. And by adapting the brushes of which sizes are appropriate to each level, it is possible to express the area which needs to be expressed in details from the one which needs to be expressed abstractly.

GPU-based Adaptive LOD control for Quadtree-Based Terrain Rendering (사진트리 기반 지형렌더링을 위한 GPU기반의 적응형 상세단계 조정 방법)

  • Choi, In-Ji;Shin, Byeong-Seok
    • Journal of Korea Game Society
    • /
    • v.8 no.3
    • /
    • pp.61-68
    • /
    • 2008
  • Quadtree-based terrain visualization methods have been used in a lot of applications. However, because most procedures are performed on the CPU, the rendering speed is slow in comparison to methods using GPU. In this paper, we present a quadtree-based terrain visualization method working on the GPU with specially designed data structure, error-texture and LOD-texture, and block-based acceleration method. In preprocessing step, we calculate errors in world space and store them to error-texture. In rendering step, we examine projected errors of error-texture and choose the detail level, then store the projected errors to LOD-texture. View frustum culling is performed as block unit using the values of error-texture and LOD-texture. This method reduces CPU load and performs time consuming jobs such as LOD selection and view frustum culling.

  • PDF

Mesh Simplification and Adaptive LOD for Finite Element Mesh Generation

  • Date, Hiroaki;Kanai, Satoshi;Kishinami, Takeshi;Nishigaki, Ichiro
    • International Journal of CAD/CAM
    • /
    • v.6 no.1
    • /
    • pp.73-79
    • /
    • 2006
  • In this paper, we propose a new triangular finite element mesh generation method based on simplification of high-density mesh and adaptive Level-of-Detail (LOD) methods for efficient CAE. In our method, mesh simplification is used to control the mesh properties required for FE mesh, such as the number of triangular elements, element shape quality and size while keeping the specified approximation tolerance. Adaptive LOD methods based on vertex hierarchy according to curvature and region of interest, and global LOD method preserving density distributions are also proposed in order to construct a mesh more appropriate for CAE purpose. These methods enable efficient generation of FE meshes with properties appropriate for analysis purpose from a high-density mesh. Finally, the effectiveness of our approach is shown through evaluations of the FE meshes for practical use.