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Modeling of a Scan Type Magnetic Camera Image Using the Improved Dipole Model
Jiseong Hwang,Jinyi Lee 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.10
The scan type magnetic camera is proposed to improve the limited spatial resolution due to the size of the packaged magnetic sensor. An image of the scan type magnetic camera, ∂B/∂x image, is useful for extracting the crack information of a specimen under a large inclined magnetic field distribution due to the poles of magnetizer. The ∂B/∂x images of the cracks of different shapes and sizes are calculated by using the improved dipole model proposed in this paper. The improved dipole model uses small divided dipole models, the rotation and relocation of each dipole model and the principle of superposition. Also for a low carbon steel specimen, the experimental results of nondestructive testing obtained by using multiple cracks are compared with the modeling results to verify the effectiveness of ∂B/∂x modeling. The improved dipole model can be used to simulate the LMF and ∂B/∂x image of a specimen with complex cracks, and to evaluate the cracks quantitatively using magnetic flux leakage testing.
Occlusion Data Augmentation for Object Detectors based on Random Erasing and Bounding Box Tailoring
Jiseong Heo,Yooseung Wang,Jihun Park 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Recent convolutional object detectors have showed remarkable improvements, but occlusion has been a major obstacle to apply them to the real-world. More specifically, in military domain, cover and concealment of objects are common, and building occlusion-tolerable object detector is important. In this paper, we introduce bounding box tailoring approach based on bivariate standard normal distribution. The main idea of our approach is tailoring bounding boxes to fit tighter to remaining object area after random erasing. Our experiments on military vehicle data set show that our approach outperforms previous random erasing data augmentation techniques.
Nondestructive Evaluation Using the Dipole Model and the Scan Type Magnetic Camera
Jiseong Hwang(황지성),Jinyi Lee(이진이) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
It is important to estimate the distribution of intensity of a magnetic field for application of magnetic method to industrial nondestructive evaluation. Magnetic camera provides the distribution of a quantitative magnetic field with homogeneous lift-off and same spatial resolution. And it is possible to interpret the distribution of the magnetic field when the dipole model is introduced. This study introduces the numerical and experimental considering of the quantitative nondestructive evaluation of several size and shapes of the cracks using the magnetic field images of the scan type magnetic camera, which is used to overcome spatial limitation due to the sensor size. Furthermore, the effectiveness of the study and possibility of inverse analysis are discussed.
The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber
Jiseong Jang,Sangwon Ji,Toshiharu Kagawa 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.1
ISO pneumatic cylinder reliability test requires air leakage measurement. Air cylinder has many parts and the leakage shall be measured before, during and after endurance test, and, the leakage should smaller than the specified value. The existing measurement method needs complex operation and the calibration of leak detector, and, has to separate the testing cylinder from endurance the air leakage during endurance test, and guarantee the reliability of the conventional measurement method. In this paper, a new method for air leakage measurement using isothermal chamber, which does not requires calibration or temperature compensation, and, can measure air leakage accurately with quite simple operations, is proposed. As a result, reliability of air leakage measurement can be improved because the proposed method does not have to separate the testing cylinder from the endurance test device for air leakage measurement. The effectiveness of the proposed method is proved by error analysis of leak measurement from experimental result.
Coil Design and Shielding Methods for a Magnetic Resonant Wireless Power Transfer System
Jiseong Kim,Jonghoon Kim,Sunkyu Kong,Hongseok Kim,In-Soo Suh,Nam Pyo Suh,Dong-Ho Cho,Joungho Kim,Seungyoung Ahn IEEE 2013 Proceedings of the IEEE Vol.101 No.6
<P>In this paper, we introduce the basic principles of wireless power transfer using magnetic field resonance and describe techniques for the design of a resonant magnetic coil, the formation of a magnetic field distribution, and electromagnetic field (EMF) noise suppression methods. The experimental results of wireless power transfer systems in consumer electronics applications are discussed in terms of issues related to their efficiency and EMF noise. Furthermore, we present a passive shielding method and a magnetic field cancellation method using a reactive resonant current loop and the utilization of these methods in an online electric vehicle (OLEV) system, in which an OLEV green transportation bus system absorbs wireless power from power cables underneath the road surface with only a minimal battery capacity.</P>