A5102006765- Advanced Thermoelectric Materials and Devices
- Optical Wireless Communication Technologies
- Thermal properties of materials
- Advanced Wireless Communication Techniques
- VLSI and Analog Circuit Testing
- Thermal Radiation and Cooling Technologies
- Error Correcting Code Techniques
- Embedded Systems Design Techniques
- Low-power high-performance VLSI design
- Radiation Effects in Electronics
- Coding theory and cryptography
- Advanced Optical Imaging Technologies
- Semiconductor Lasers and Optical Devices
- Statistical Methods and Inference
- Crystallization and Solubility Studies
- Context-Aware Activity Recognition Systems
- Cryptographic Implementations and Security
- Sensor Technology and Measurement Systems
- Radio Wave Propagation Studies
- Parallel Computing and Optimization Techniques
- X-ray Diffraction in Crystallography
- Advanced Data Storage Technologies
- Technology and Data Analysis
- Physical Unclonable Functions (PUFs) and Hardware Security
- Real-Time Systems Scheduling
Daegu Gyeongbuk Institute of Science and Technology
2012-2024
Sungkyunkwan University
2013-2023
Korea Institute of Industrial Technology
2023
Daegu University
2013-2015
Pukyong National University
2005-2014
Korea Advanced Institute of Science and Technology
1989-2010
Yonsei University
2007-2008
Gyeongsang National University
2003
Taegu Science University
2000
Jeonbuk National University
1997
The authors have developed a semitransparent, multilayered cathode of indium tin oxide (ITO)/Ag/tungsten (WO3) for transparent organic light-emitting diodes. device showed weak negative differential resistance (NDR), until the operating voltage 8V was reached. NDR due to resonant tunneling by both quantum barrier and well. silver (Ag2O) on Ag metal confirmed x-ray photoelectron spectroscopy, energy levels Ag2O were quantized size effect this produced channels. using ITO∕Ag∕WO3 with LiF∕Al...
A positioning system based on visible light communication (VLC) utilizes illuminating indoor lights to identify the location of objects. The complexity and cost VLC are largely affected by limited bandwidths optical emitters detectors. In this paper, we present an signaling multiplexing technique, which employs Hadamard matrices implement a multiple-input multiple-output (MIMO) system. Fundamental conditions create nonnegative signals brightness control defined in conjunction with different...
The authors demonstrate the production of amorphous fluorinated carbon (a-C:F) thin film with adjustable wetting properties, inducing variable liquid crystal (LC) pretilt angles. To control surface they apply a dual radio frequency magnetron system controlled power ratio targets. In this manner we obtain various compositional surfaces fluorine and components adjust energy regard to compositions. Whereas fluorine-rich a-C:F layer shows preference for homeotropic (vertical) LC alignment,...
In recent years, several indoor positioning systems have been extensively studied for environments where a satellite signal is typically degraded and interrupted. Among them, visible light (VLP), which has advantages such as the absence of electromagnetic interference, energy efficiency, high bandwidth availability, received considerable attention. However, most VLP are established based on two-dimensional (2D) methods in height receiver fixed or restricted tilt not considered. To solve...
Various chemical reaction processes have been adopted to synthesize Bi2Te3 thermoelectric nanomaterials for achieving remarkably low thermal conductivities, but contaminations were usually pointed out as flaws, severely deteriorating electrical conductivities. We devised a novel water-based process Bi2Te2.7Se0.3 nanocompound in which the possibility was reduced. successfully synthesized small and highly distributed with high purity adequately packed it via spark plasma sintering produce...
Well-crystallized <TEX>$BaSi_2O_5:Eu^{2+}$</TEX> phosphor films were synthesized by heat treatment of spin-coated BaO:Eu on <TEX>$SiO_2$</TEX> glass. We investigated luminescence-structure properties these as a function heat-treatment temperature. From x-ray diffraction patterns, our revealed that (111)- and (204)-crystal planes <TEX>$BaSi_2O_5$</TEX> crystal dominantly increased with an increase Photoluminescence intensities amount planes. It can be explained <TEX>$Eu^{2+}$</TEX> ions...
The direct time-of-flight (d-ToF) technique is the most promising method for light detection and ranging (LiDAR) systems in long-range autonomous applications. However, receiver cannot distinguish its own pulse signal from those of other LiDAR systems. This causes mutual interference between systems, which degrades object recognition. optical code division multiple access (OCDMA) modulation can be used to avoid interference. it difficult secure sufficient orthogonal codes, because each laser...
The authors have demonstrated efficient polymeric tandem organic light-emitting diodes (OLEDs) with a self-organized interfacial layer, which was formed by differences in chemical surface energy. Hydrophilic poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) (PEDOT:PSS) spin coated onto the hydrophobic poly(9,9-dyoctilfluorene) (PFO) and PEDOT:PSS bubble or dome built as an layer. barrier heights of PFO two-unit OLED induced charge accumulation at interface heterojunction...
In current design practice, the shear wave velocity (Vs) of core and rock-fill zone a dam, one characteristics essential for seismic response design, is seldom determined by field tests. This because borehole method often restricted in application, due to stabilisation activities concern security dam structure, surface methods are limited unfavourable in-situ site conditions. Consequently, may be performed using Vs values that assumed, or empirically determined. To estimate zone, find...
This paper generalizes the capacitive touch sensing problem in a form of weighing matrices which cover Walsh-Hadamard, 4k-order Hadamard, and other types matrices. The existing regular Hadamard matrix, conference that have small sum column weights, increase signal sensitivity as well signal-to-noise ratio for signals. Experiments show proposed design approach various can meet different requirements. results this research sophisticated matrix improves three times higher than time-multiplexed method.
We report on nonlinear optical image processing, such as addition and subtraction, using photoinduced anisotropy in amorphous As(2)S(3) thin film propose a method for contrast reversal edge enhancement of an image.
This paper presents a design of AES (advanced encryption standard) with parallel architecture. The proposed architecture maintains throughput as it is but consumes lower power than the original by using 1/2 clock-rate and reducing supply voltage. Models were designed VHDL verified both functional gate-level simulation. They logically synthesized 0.25 um, 90 nm cell library Synopsys Design compiler. Power consumption was computed PrimePower.
A single event transient generated from a high-energy particle is capable of corrupting the status digital system. Not only in aerospace engineering, but even terrestrial application system reliability expected to worsen due radiation effects as semi-conductor technology advances. In this paper, we introduce an incremental gate-sizing method for minimizing soft errors gate-level designs. The target designs have constraints marginal circuit area and path delay. proposed heuristic algorithm...