A5011734550- Advanced Thermoelectric Materials and Devices
- Medical Imaging Techniques and Applications
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Advanced Radiotherapy Techniques
- Chalcogenide Semiconductor Thin Films
- Advanced MRI Techniques and Applications
- Medical Image Segmentation Techniques
- Graphene research and applications
- Advanced ceramic materials synthesis
- ZnO doping and properties
- Heusler alloys: electronic and magnetic properties
- Advanced X-ray Imaging Techniques
- Gas Sensing Nanomaterials and Sensors
- Ferroelectric and Piezoelectric Materials
- Advanced Thermodynamics and Statistical Mechanics
- Radiomics and Machine Learning in Medical Imaging
- 2D Materials and Applications
- Thermal Expansion and Ionic Conductivity
- Advanced materials and composites
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Soft Robotics and Applications
- AI in cancer detection
Korea Institute of Ceramic Engineering and Technology
2011-2024
Korea Institute of Science and Technology
2023-2024
Korea University
2022-2024
Kyungpook National University
2021
Government of the Republic of Korea
2020
International University of Korea
2020
Institute for Basic Science
2016-2018
Korea Advanced Institute of Science and Technology
2010-2017
2 mol% Al-doped ZnO nanoparticles were consolidated into a nanocomposite with ZnAl2O4 nanoprecipitates by spark plasma sintering and its high-temperature charge transport thermoelectric properties investigated up to 1073 K. The carrier concentration in the was not dependent on temperature, while Hall mobility showed positive temperature-dependence due grain boundary scattering. negative Seebeck coefficient of linearly proportional density state effective mass (md*) evaluated be 0.33me using...
Finding alternatives for Bi2Te3, the only thermoelectric material near-room-temperature (RT) applications, is of great importance in thermoelectrics. Here, we report a very promising near-RT figure merit (ZTmax = 0.9 at 390 K, ZTave 0.68 between RT and K) Cu-excess α-Cu2+xSe, comprising low-cost, abundant, nontoxic elements. Although α-Cu2+xSe has propensity to form large number Cu vacancies stabilize its structure by diminishing Cu–Cu interactions, excess leads decrease hole concentration...
ZnO, a wide bandgap semiconductor, has attracted much attention due to its multifunctionality, such as transparent conducting oxide, light-emitting diode, photocatalyst, and so on. To improve performances in the versatile applications, numerous hybrid strategies of ZnO with graphene have been attempted, various synergistic effects achieved ZnO-graphene nanostructures. Here we report extraordinary charge transport behavior Al-doped (AZO)-reduced oxide (RGO) nanocomposites. Although most...
Abstract Point defect or doping in Strontium titanium oxide (STO) largely determines the thermoelectric (TE) properties. So far, insufficient knowledge exists on impact of double Schottky barrier TE performance. Herein, we report a drastic effect performance undoped STO. It demonstrates that incorporation Reduced Graphene Oxide (RGO) into STO weakens and thereby results simultaneous increase both carrier concentration mobility The enhanced exhibits single crystal-like behavior. This boosts...
The registration of a three-dimensional (3D) ultrasound (US) image with computed tomography (CT) or magnetic resonance is beneficial in various clinical applications such as diagnosis and image-guided intervention the liver. However, conventional methods usually require time-consuming inconvenient manual process for pre-alignment, success this strongly depends on proper selection initial transformation parameters. In paper, we present an automatic feature-based affine procedure 3D...
Thermoelectric properties are frequently manipulated by introducing point defects into a matrix. However, these often change in unfavorable directions owing to the spontaneous formation of vacancies at high temperatures. Although it is crucial maintain thermoelectric performance over broad temperature range, suppression challenging since their thermodynamically preferred. In this study, using PbTe as model system, demonstrated that dimensionless figure merit, zT ≈ 2.1 723 K, can be achieved...
We report synergistically enhanced thermoelectric properties through the independently controlled charge and thermal transport in a TiO2–reduced graphene oxide (RGO) nanocomposite. By consolidation of TiO2–RGO hybrid powder using spark plasma sintering, we prepared an interface-controlled nanocomposite where its grain boundaries are covered with RGO network. Both enhancement electrical conductivity reduction were simultaneously achieved thanks to beneficial effects network, detailed...
The AgBiSe<sub>2</sub>–CuBiSe<sub>2</sub> system shows band nestification at high temperatures, resulting in heavy DOS effective mass while preserving electron mobility.
A twisted grain boundary is introduced in the tellurium crystal to effectively block phonon propagation while maintaining high electron mobility for superior thermoelectric properties.
In order to utilize both ultrasound (US) and computed tomography (CT) images of the liver concurrently for medical applications such as diagnosis image-guided intervention, non-rigid registration between these two types is an essential step, local deformation US CT exists due different respiratory phases involved probe pressure that occurs in imaging. This paper introduces a voxel-based algorithm 3D B-mode liver. proposed algorithm, improve accuracy, we surface information gallbladder...
Bi 2 Te 3 ‐based materials have drawn much attention from the thermoelectric community due to their excellent performance near room temperature. However, stability of existing n‐type (Te,Se) is still low evaporation energy Se (37.70 kJ mol −1 ) being lower than that (52.55 ). The evaporated material causes problems in interconnects module while degrading efficiency. Here, we developed a new approach for high‐performance and stable Se‐free by maximizing electronic transport suppressing phonon...
A simple method for the preparation of hollow rock-salt TiO1−xNx nanoparticles and their visible-light photocatalytic activities are presented. By thermal annealing TiO2 under NH3/N2 gas flow at 800 °C, a TiO phase was achieved far below its transition temperature to monoclinic (1250 °C). The composition revealed be Ti0.7(O0.67N0.33)1 by detailed structural compositional characterizations, stability critically determined formation vacancies incorporation N. presented efficient activity,...
Registration between 2D ultrasound (US) and 3D preoperative magnetic resonance (MR) (or computed tomography, CT) images has been studied recently for US-guided intervention. However, the existing techniques have some limits, either in registration speed or performance. The purpose of this work is to develop a real-time fully automatic system two intermodal liver, subsequently an indirect lesion positioning/tracking algorithm based on result, image-guided interventions.The proposed position...
A new route for realizing ‘phonon-glass electron-crystals’ through a hybrid strategy using carbon nanotubes is proposed.
Positron emission tomography (PET) images usually suffer from a noticeable amount of statistical noise. In order to reduce this noise, post-filtering process is adopted. However, the performance approach limited because denoising mostly performed on basis Gaussian random It has been reported that in PET image reconstructed by expectation-maximization (EM), noise variance each voxel depends its mean value, unlike case addition, we observe also varies with spatial sensitivity distribution...