• Title/Summary/Keyword: Stitching Range

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Effect of Stitching Range on Radiation Dose to Eyeball, Thyroid, Breast, Pelvis in Whole Spine Radiography with Standing Position (선 자세 척추 전장 방사선검사 시 스티칭 범위가 장기(수정체, 갑상샘, 유방, 골반부)의 선량에 미치는 영향)

  • Min-Ji, Hong;Han-Yong, Kim;Dong-Hwan, Kim;Young-Cheol, Joo
    • Journal of the Korean Society of Radiology
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    • v.17 no.1
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    • pp.47-52
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    • 2023
  • In whole spine radiography using the stitching technique, overlapping parts occur in the process of synthesizing the three segmented images, so some anatomical structures may be repeatedly exposed, and it has been thought that the dose increases as the scan range increases. However, in the whole spine radiography using the stitching technique in this study, under the condition that the stitching range is taken in the same three splits, the overlapping area decreases as the stitching range increases, so in the case of breasts included in the overlapping range, the dose value decreased by almost half as the stitching range increased from 90 cm to 105 cm. During spinal full-length radiological examination using the stitching method, an appropriately long stitching range could be set to reduce the exposure dose of the breast.

The Effect of the Position Change of the Magnification Marker and the Stitching Range on the Image in the Examination of the Femur Radiography Using Stitching Technique (스티칭 기법을 이용한 대퇴골 방사선검사 시 확대 표식자 위치 및 스티칭 범위 변화가 영상에 미치는 영향)

  • Hong, Seong-Woo;Joo, Young-Cheol;Kim, Sheung-Hyuk;Go, Ye-Weon;Kim, Jong-Suk
    • Journal of radiological science and technology
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    • v.43 no.5
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    • pp.331-336
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    • 2020
  • In this study, we would like to examine the effect of the location of the magnification marker and the change in the stitching range on the magnification marker and the expansion of the anatomical structure in the examination of femoral stitching radiation using the stitching technique, and to find out the usability of the femoral stitching radiation examination in the preoperative examination for THRA. The measured values measured by 5 researchers were summed and presented through descriptive statistics. When the position of the magnification marker was changed, the average value of the measured value was in the range of 113.54 to 113.90 mm. The anatomical structures of the femur were measured in the range of 57.24 to 57.78 mm, 27.20 to 27.56 mm, and 70.11 to 70.81 mm, respectively. This showed a similar deviation from the expansion rate of previous related papers using markers. Therefore, it is considered that femoral stitching X-ray examination using magnification markers can be used for preoperative examination for THRA.

Very Large Scale Analysis of Surfaces for Diamond Turned Machine Diagnosis (다이아몬드 선삭 가공기의 진단을 위한 대영역 표면 해석)

  • 김승우;장인철;김동식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.687-691
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    • 2000
  • Diamond turning machines for manufacture of precision optics require deliberate diagnosis to ensure that all the machine elements are properly operating, kinematically, dynamically and thermally, to produce demanded work qualities. One effective way is to directly inspect topographical features of work surfaces that have been carefully generated with prescribed machining conditions intended to exaggerate faulty consequences of any ill-operating machine elements. In this research, a very-large-scale Phase measuring interferometric system that has been developed for years at Korea Advanced Institute of Science and Technology is used to fulfill the metrological requirements fur the surface analysis. A special stitching technique is used to extend the measuring range, which integrates all the patches that are separately sampled over the whole surface while moving the stage. Then, the measured surface profile is analyzed to releated the machine error sources. For this, zernike polynomial fitting is used together with the wavelet filter and the fourier transform. Experimental results showed that the suggested technique in this study is very effective in diagnosing actual diamond turning machines

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A Study on the mechanical Characteristics of Kevlar Plain Weft Knitted Fabrics Reinforced Composites for Development of Intrusion Beam of Car Side Door Application (자동차 사이드 도어용 인트루젼 비임 개발을 위한 케블라섬유강화 복합재료의 기계적 특성에 관한 연구)

  • 이동기
    • Journal of Ocean Engineering and Technology
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    • v.14 no.2
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    • pp.89-98
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    • 2000
  • Using conventional textile techniques such as weaving braiding knitting and stitching it is possible to produce a wide range two and three dimensional fiber preforms, however so far only a limited attention has been given to knitted fabrics in composite industry. This is mainly due to the opinion that knitted fabric reinforced composites posses low mechanical properties owing to their looped fiber architecture. But it is possible to obtain desired mechanical properties by selecting proper knitted fabric structure, In this paper mechanical characteristics of kevlar plain weft knitted fabrics reinforced plastics(KFRP) are evaluated for th development of intrusion beam of car side door. Tensile bending impact properties of KFRP are measured experimentally and crush demands of Americal Federal Motor Vehicle Safety Standard No.214(FMVSS 214) compared with the bending load and displacement of KFRP by quasi-static test method. The applicability and limitation of bending load and displacement of KFRP according to specimen size has been discussed.

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Wideband Chirp Waveform Simulation and Performance Analysis for High Range Resolution Radar Imaging (고해상도 영상 레이다의 광대역 첩 신호 파형 발생 시뮬레이션과 성능 분석)

  • Kwag, Young Kil
    • Journal of Advanced Navigation Technology
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    • v.6 no.2
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    • pp.97-103
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    • 2002
  • A recent technology trends in synthetic aperture radar(SAR) requires the ultra high resolution performance in detecting and precisely identifying the targets. In this paper, as a technique for enhancing the radar range resolution, the wide band chirp connection algorithm is presented by stitching the several chirp modules with unit bandwidth based on the linear frequency modulated chirp signal waveform. The principles of the digital chirp signal generation and its architecture for implementation is described with the wide band chirp signal generator, modulator, and demodulator. The performance analysis for the presented algorithm is given with the simulation results.

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Wideband Chirp Waveform Design for High Range Resolution Radar Imaging (고해상도 영상 레이다의 광대역 첩 신호 파형 설계)

  • 곽영길;조호신
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.1
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    • pp.1-7
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    • 2003
  • A recent technology trends in synthetic aperture radar(SAR) requires the ultra high resolution performance in detecting and precisely identifying the targets. In this paper, as a technique for enhancing the radar range resolution, the wideband chirp connection algorithm is presented by stitching the several chirp modules with unit bandwidth based on the linear frequency modulated chirp signal waveform. The principles of the digital chirp signal generation and its architecture for implementation is briefly described, and the wideband chirp signal generator, modulator, and demodulator are designed. The performance analysis for the presented algorithm is given with the simulation results.

A 2D / 3D Map Modeling of Indoor Environment (실내환경에서의 2 차원/ 3 차원 Map Modeling 제작기법)

  • Jo, Sang-Woo;Park, Jin-Woo;Kwon, Yong-Moo;Ahn, Sang-Chul
    • 한국HCI학회:학술대회논문집
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    • 2006.02a
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    • pp.355-361
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    • 2006
  • In large scale environments like airport, museum, large warehouse and department store, autonomous mobile robots will play an important role in security and surveillance tasks. Robotic security guards will give the surveyed information of large scale environments and communicate with human operator with that kind of data such as if there is an object or not and a window is open. Both for visualization of information and as human machine interface for remote control, a 3D model can give much more useful information than the typical 2D maps used in many robotic applications today. It is easier to understandable and makes user feel like being in a location of robot so that user could interact with robot more naturally in a remote circumstance and see structures such as windows and doors that cannot be seen in a 2D model. In this paper we present our simple and easy to use method to obtain a 3D textured model. For expression of reality, we need to integrate the 3D models and real scenes. Most of other cases of 3D modeling method consist of two data acquisition devices. One for getting a 3D model and another for obtaining realistic textures. In this case, the former device would be 2D laser range-finder and the latter device would be common camera. Our algorithm consists of building a measurement-based 2D metric map which is acquired by laser range-finder, texture acquisition/stitching and texture-mapping to corresponding 3D model. The algorithm is implemented with laser sensor for obtaining 2D/3D metric map and two cameras for gathering texture. Our geometric 3D model consists of planes that model the floor and walls. The geometry of the planes is extracted from the 2D metric map data. Textures for the floor and walls are generated from the images captured by two 1394 cameras which have wide Field of View angle. Image stitching and image cutting process is used to generate textured images for corresponding with a 3D model. The algorithm is applied to 2 cases which are corridor and space that has the four wall like room of building. The generated 3D map model of indoor environment is shown with VRML format and can be viewed in a web browser with a VRML plug-in. The proposed algorithm can be applied to 3D model-based remote surveillance system through WWW.

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Implementation of High-definition Digital Signage Reality Image Using Chroma Key Technique (크로마키 기법을 이용한 고해상도 디지털 사이니지 실감 영상 구현)

  • Moon, Dae-Hyuk
    • Journal of Industrial Convergence
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    • v.19 no.6
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    • pp.49-57
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    • 2021
  • Digital Signage and multi-view image system are used as the 4th media to deliver stories and information due to their strong immersion. A content image displayed on large Digital Signage is produced with the use of computer graphics, rather than reality image. That is because the images shot for content making have an extremely limited range of production and their limitation to high resolution, and thereby have difficulty being displayed in a large and wide Digital Signage screen. In case of Screen X and Escape that employ the left and right walls of in the center a movie theater as a screen, images are shot with three cameras for Digital Cinema, and are screened in a cinema with multi-view image system after stitching work is applied. Such realistic images help viewers experience real-life content. This research will be able to display high-resolution images on Digital Signage without quality degradation by using the multi-view image making technique of Screen X and Chroma key technique are showed the high-resolution Digital Signage content making method.

Conservation of Chungjeong-Kwan, Joseon Dynasty (조선시대(朝鮮時代) 충정관(忠靜冠)의 보존처리(保存處理))

  • Lee, Mee-sik;Song, Mee-kyung;Bae, Soon-wha;Hong, Moon-kyung
    • Conservation Science in Museum
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    • v.3
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    • pp.29-36
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    • 2001
  • The hat excavated from the tomb of Hojeo-myon Wonsung-gun in Kangwon province was dry-cleaned and restored. The hat was made of wool felt and decorated with several strands of silk cord. It was very dirty and moth-eaten. After getting rid of the particle soils on a surface with painting brush, the hat was dry-cleaned using perchloroethylene applying the minimum force, and blotting paper was used for drying. During cleaning, it was supported by the stainless steel net. The weight loss was 7.94% after cleaning. The soils sticked on the hat was removed clearly. The texture of the hat became softer after cleaning. Color difference(∆E) was 2.57, which is a noticeable change. The color became clear and changed to the red and yellow range. After dry-cleaning, the hat was repaired. Dislocated silk cords were fixed to the right place by stitching with silk yarn. To keep the shape of the hat, it should be supported by a hat-shaped stiff net during exibition and storing.

Multiple Camera Calibration for Panoramic 3D Virtual Environment (파노라믹 3D가상 환경 생성을 위한 다수의 카메라 캘리브레이션)

  • 김세환;김기영;우운택
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.41 no.2
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    • pp.137-148
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    • 2004
  • In this paper, we propose a new camera calibration method for rotating multi-view cameras to generate image-based panoramic 3D Virtual Environment. Since calibration accuracy worsens with an increase in distance between camera and calibration pattern, conventional camera calibration algorithms are not proper for panoramic 3D VE generation. To remedy the problem, a geometric relationship among all lenses of a multi-view camera is used for intra-camera calibration. Another geometric relationship among multiple cameras is used for inter-camera calibration. First camera parameters for all lenses of each multi-view camera we obtained by applying Tsai's algorithm. In intra-camera calibration, the extrinsic parameters are compensated by iteratively reducing discrepancy between estimated and actual distances. Estimated distances are calculated using extrinsic parameters for every lens. Inter-camera calibration arranges multiple cameras in a geometric relationship. It exploits Iterative Closet Point (ICP) algorithm using back-projected 3D point clouds. Finally, by repeatedly applying intra/inter-camera calibration to all lenses of rotating multi-view cameras, we can obtain improved extrinsic parameters at every rotated position for a middle-range distance. Consequently, the proposed method can be applied to stitching of 3D point cloud for panoramic 3D VE generation. Moreover, it may be adopted in various 3D AR applications.