Search

Your search keyword '"Bae, Young Min"' showing total 533 results
Start Over Author "Bae, Young Min"
533 results on '"Bae, Young Min"'

4. Deep Learning Diffuse Optical Tomography

Author

Yoo, Jaejun, Sabir, Sohail, Heo, Duchang, Kim, Kee Hyun, Wahab, Abdul, Choi, Yoonseok, Lee, Seul-I, Chae, Eun Young, Kim, Hak Hee, Bae, Young Min, Choi, Young-wook, Cho, Seungryong, and Ye, Jong Chul

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Artificial Intelligence, Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

Diffuse optical tomography (DOT) has been investigated as an alternative imaging modality for breast cancer detection thanks to its excellent contrast to hemoglobin oxidization level. However, due to the complicated non-linear photon scattering physics and ill-posedness, the conventional reconstruction algorithms are sensitive to imaging parameters such as boundary conditions. To address this, here we propose a novel deep learning approach that learns non-linear photon scattering physics and obtains an accurate three dimensional (3D) distribution of optical anomalies. In contrast to the traditional black-box deep learning approaches, our deep network is designed to invert the Lippman-Schwinger integral equation using the recent mathematical theory of deep convolutional framelets. As an example of clinical relevance, we applied the method to our prototype DOT system. We show that our deep neural network, trained with only simulation data, can accurately recover the location of anomalies within biomimetic phantoms and live animals without the use of an exogenous contrast agent., Comment: Accepted for IEEE Trans. on Medical Imaging

Published
2017
Full Text
View/download PDF

25. Improved Energy Storage Density and Efficiency of Nd and Mn Co-Doped Ba 0.7 Sr 0.3 TiO 3 Ceramic Capacitors Via Defect Dipole Engineering.

Author

Choi, Hyunsu, Pattipaka, Srinivas, Son, Yong Hoon, Bae, Young Min, Park, Jung Hwan, Jeong, Chang Kyu, Lee, Han Eol, Kim, Sung-Dae, Ryu, Jungho, and Hwang, Geon-Tae

Subjects
CERAMIC capacitors, ENERGY storage, ENERGY density, ELECTRIC breakdown, PERMITTIVITY, DOPING agents (Chemistry)
Abstract

In this paper, we investigate the structural, microstructural, dielectric, and energy storage properties of Nd and Mn co-doped Ba0.7Sr0.3TiO3 [(Ba0.7Sr0.3)1−xNdxTi1−yMnyO3 (BSNTM) ceramics (x = 0, 0.005, and y = 0, 0.0025, 0.005, and 0.01)] via a defect dipole engineering method. The complex defect dipoles (M n T i " − V O ∙ ∙ ) ∙ and (M n T i " − V O ∙ ∙) between acceptor ions and oxygen vacancies capture electrons, enhancing the breakdown electric field and energy storage performances. XRD, Raman, spectroscopy, XPS, and microscopic investigations of BSNTM ceramics revealed the formation of a tetragonal phase, oxygen vacancies, and a reduction in grain size with Mn dopant. The BSNTM ceramics with x = 0.005 and y = 0 exhibit a relative dielectric constant of 2058 and a loss tangent of 0.026 at 1 kHz. These values gradually decreased to 1876 and 0.019 for x = 0.005 and y = 0.01 due to the Mn2+ ions at the Ti4+- site, which facilitates the formation of oxygen vacancies, and prevents a decrease in Ti4+. In addition, the defect dipoles act as a driving force for depolarization to tailor the domain formation energy and domain wall energy, which provides a high difference between the maximum polarization of Pmax and remnant polarization of Pr (ΔP = 10.39 µC/cm2). Moreover, the complex defect dipoles with optimum oxygen vacancies in BSNTM ceramics can provide not only a high ΔP but also reduce grain size, which together improve the breakdown strength from 60.4 to 110.6 kV/cm, giving rise to a high energy storage density of 0.41 J/cm3 and high efficiency of 84.6% for x = 0.005 and y = 0.01. These findings demonstrate that defect dipole engineering is an effective method to enhance the energy storage performance of dielectrics for capacitor applications. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results