• Title/Summary/Keyword: National Control Points

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The Study of Quality Control for Package Printing (포장 인쇄의 인쇄적성 향상에 관한 연구)

  • Lee, Man-Gyo;Ha, Young-Baeck;Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.23 no.1
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    • pp.53-63
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    • 2005
  • The quality of the print can be specified through the quality of the coloring, the reproduction of fine structures and the range of tone values. Also, package printed quality are controlled by this points. In this paper, densitometry method was used for printed quality. By densitometry we can get the print density and the parameters of each conditions that characterize halftone printing, such as dot gain and relative printing contrast. Also, we have proposed the optimizes range of the parameters such as density, dot gain etc. to the package printed printability control.

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Euler Angle-Based Global Motion Estimation Model for Digital Image Stabilization (디지털 영상 안정화를 위한 오일러각 기반 전역 움직임 추정 모델)

  • Kwak, Hwy-Kuen;Lyou, Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.11
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    • pp.1053-1059
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    • 2010
  • This paper treats the DIS (Digital Image Stabilization) problem subject to base motions such as translation, rotation and zoom. For the local motion estimation from a raw image, the Harris corner detection algorithm is exploited to extract feature points, and comparing those of consecutive images, the zoom ratio (scale factor) is computed. For the global motion estimation, an equivalent model is derived to account for a 3-dimensional composite motion from which the center point and Euler angle can be determined. Finally, the motion compensation follows. To show the effectiveness of the present DIS scheme, experimental results for synthetic images are illustrated.

Evaluating Efficacy of Hilbert-Huang Transform in Analyzing Manufacturing Time Series Data with Periodic Components (제조업의 주기성 시계열분석에서 힐버트 황 변환의 효용성 평가)

  • Lee, Sae-Jae;Suh, Jung-Yul
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.35 no.2
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    • pp.106-112
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    • 2012
  • Real-life time series characteristic data has significant amount of non-stationary components, especially periodic components in nature. Extracting such components has required many ad-hoc techniques with external parameters set by users in case-by-case manner. In our study, we evaluate whether Hilbert-Huang Transform, a new tool of time-series analysis can be used for effective analysis of such data. It is divided into two points : 1) how effective it is in finding periodic components, 2) whether we can use its results directly in detecting values outside control limits, for which a traditional method such as ARIMA had been used. We use glass furnace temperature data to illustrate the method.

Kinematic Analysis of Multi Axis Shaking Table for Multi-Purpose Test of Heavy Transport Vehicle (고하중 차량의 다목적 테스트를 위한 다축 가진 테이블의 기구학 해석)

  • Jin, Jae-Hyun;Na, Hong-Cheoul;Jeon, Seung-Bae
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.9
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    • pp.823-829
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    • 2012
  • An excitation table is commonly used for vibration and ride tests for parts or assemblies of automobiles, aircrafts, or other heavy systems. The authors have analyzed several kinematic properties of an excitation table that is under development for heavy transport vehicles. It consists of one table and 7 linear hydraulic actuators. The authors have performed mobility analysis, inverse kinematics, forward kinematics, and singularity analysis. Especially, we have proposed a fast forward kinematic solution considering the limited motion of the excitation table. On the assumption that the motion variables such as rotation angles and displacements are small, the forward kinematic problem is converted to the observer problem of a linear system. This provides a fast solution. Also we have verified that there are no singularity points in the working range by numerical analysis.

SIFT-Like Pose Tracking with LIDAR using Zero Odometry (이동정보를 배제한 위치추정 알고리즘)

  • Kim, Jee-Soo;Kwak, Nojun
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.11
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    • pp.883-887
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    • 2016
  • Navigating an unknown environment is a challenging task for a robot, especially when a large number of obstacles exist and the odometry lacks reliability. Pose tracking allows the robot to determine its location relative to its previous location. The ICP (iterative closest point) has been a powerful method for matching two point clouds and determining the transformation matrix between the maps. However, in a situation where odometry is not available and the robot moves far from its original location, the ICP fails to calculate the exact displacement. In this paper, we suggest a method that is able to match two different point clouds taken a long distance apart. Without using any odometry information, it only exploits the features of corner points containing information on the surroundings. The algorithm is fast enough to run in real time.

Cerebellar Control of Saccades (소뇌의 단속안구운동 조절)

  • Choi, Jae-Hwan;Choi, Kwang-Dong
    • Annals of Clinical Neurophysiology
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    • v.15 no.2
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    • pp.37-41
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    • 2013
  • Saccades are rapid eye movements that shift the line of sight between successive points of fixation. The cerebellum calibrates saccadic amplitude (dorsal vermis and fastigial nucleus) and the saccadic pulse-step match (flocculus) for optimal visuo-ocular motor behavior. Based on electrophysiology and the pharmacological inactivation studies, early activity in one fastigial nucleus could be important for accelerating the eyes at the beginning of a saccade, and the later activity in the other fastigial nucleus could be critical for stopping the eye on target, which is controlled by inhibitory projection from the dorsal vermis. The cerebellum could monitor a corollary discharge of the saccadic command and terminate the eye movement when it is calculated to be on target. The fastigial nucleus and dorsal vermis also participate in the adaptive control of saccadic accuracy.

Analysis and Design of Whole-Head Magnetic Brain Stimulators: A Simulation Study

  • Lee, Chany;Im, Chang-Hwan;Jung, Hyun-Kyo
    • International Journal of Control, Automation, and Systems
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    • v.5 no.3
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    • pp.337-342
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    • 2007
  • This paper proposes a helmet-type whole-head brain stimulator system considering a realistic head geometry. For more accurate design and computer simulations, a realistic volume conductor model was adopted and the current evoked on human cerebral cortex was analyzed using the boundary element method (BEM). To obtain a more focalized evoked current around the target points, various coil configurations were tested and an average targeting error of about 10 mm was obtained.

Approaches for Automatic GCP Extraction and Localization in Airborne SAR Images and Some Test Results

  • Tsay, Jaan-Rong;Liu, Pang-Wei
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.360-362
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    • 2003
  • This paper presents simple feature-based approaches for full- and/or semi-automatic extraction, selection, and localization (center-determination) of ground control points (GCPs) for radargrammetry using airborne synthetic aperture radar (SAR) images. Test results using airborne NASA/JPL TOPSAR images in Taiwan verify that the registration accuracy is about 0.81.4 pixels. In c.a. 30 minutes, 15003000 GCPs are extracted and their point centers in a SAR image of about 512 × 512 pixels are determined on a personal computer.

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Nonlinear analysis using load-displacement control

  • Kwon, Young-Doo;Kwon, Hyun-Wook;Lim, Beom-Soo
    • Structural Engineering and Mechanics
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    • v.19 no.2
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    • pp.153-172
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    • 2005
  • A new load/displacement parameter method is proposed for the simultaneous control of applied loads and structural displacements at one or more points. The procedure is based on a generalized Riks' method, which utilizes load/displacement parameters as scaling factors to analyze post-buckling phenomena including snap-through or snap-back. The convergence characteristics are improved by employing new relaxation factors through an incremental displacement parameter, particularly in a region that exhibits severe numerical instability. The improved performance is illustrated by means of a numerical example.

FINITE ELEMENT SOLUTIONS OF PARTIAL DIFFERENTIAL EQUATION WITH MULTIPLE CONCAVE CORNERS

  • Kim, Seokchan;Woo, Gyungsoo
    • Honam Mathematical Journal
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    • v.40 no.4
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    • pp.785-794
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    • 2018
  • In [8] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities. They consider the Poisson equations with homogeneous Dirichlet boundary condition with one corner singularity at the origin, and compute the finite element solution using standard FEM and use the extraction formula to compute the stress intensity factor, then pose a PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor, which converges with optimal speed. From the solution they could get an accurate solution just by adding the singular part. This approach uses the polar coordinate and the cut-off function to control the singularity and the boundary condition. In this paper we consider Poisson equations with multiple singular points, which involves different cut-off functions which might overlaps together and shows the way of cording in FreeFEM++ to control the singular functions and cut-off functions with numerical experiments.