A5006079429- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- GaN-based semiconductor devices and materials
- Underwater Vehicles and Communication Systems
- Radio Frequency Integrated Circuit Design
- Underwater Acoustics Research
- Semiconductor Lasers and Optical Devices
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- HVDC Systems and Fault Protection
- Multilevel Inverters and Converters
- Advancements in Semiconductor Devices and Circuit Design
- Ferroelectric and Piezoelectric Materials
- Engineering Applied Research
- Advanced DC-DC Converters
- Microwave Imaging and Scattering Analysis
- Innovative Energy Harvesting Technologies
- Semiconductor materials and interfaces
- Block Copolymer Self-Assembly
- Wireless Power Transfer Systems
- Graphene research and applications
- Silicon Carbide Semiconductor Technologies
- Acoustic Wave Resonator Technologies
- Copper Interconnects and Reliability
- Microgrid Control and Optimization
Electronics and Telecommunications Research Institute
2004-2025
Korea Institute of Industrial Technology
2020-2024
Daewoo Shipbuilding and Marine Engineering (South Korea)
2024
Hyundai Engineering (South Korea)
2021-2024
RTDS Technologies (Canada)
2024
Korea Institute of Science and Technology
2008-2023
Joint Research Center
2022
École Polytechnique Fédérale de Lausanne
2018-2021
Seoul National University
2012-2019
Agency for Defense Development
2006-2018
In July 1999, an at-sea experiment to measure the focus of a 3.5-kHz centered time-reversal mirror (TRM) was conducted in three different environments: absorptive bottom, reflective and sloping bottom. The included preliminary exploration using TRM generate binary-phase shift keying communication sequences each these environments. Broadside transmissions were also made, single-source communications simulated measured-channel response. A comparison results is made time reversal shown be...
Abstract Attitude models have been widely applied to natural resource management ensure responsible environmental behavior. For a variety of applications, the causality among selected antecedents, such as knowledge issues, locus control, attitude, personal responsibility, and intention act on behavior has not yet tested empirically. A hypothesized causal model based Hine's (1986) was developed. The data from 523 visitors urban forest trail in Kwang-Reung Arboretum, Korea, during September...
A series of time-reversal experiments was performed in shallow water including a range-dependent slope environment. Time-reversal arrays implemented with center frequencies 445 and 3500 Hz achieved sharp focal regions up to ranges 30 13 km, respectively 110–130-m water. In this paper, resolution expressions are derived using an image method describe the sizes various ocean environments. Analysis for measured data indicates that size approaches diffraction limit array given waveguide...
Abstract The purpose of this study is to examine the effects spatial structure recreation opportunity on travel. Spatial are explored in terms trip generation and level competition/agglomeration among opportunities. results indicate that activity increases as a function number nearby (within 25 miles) facilities. also facilities exhibit both competitive agglomerative relationships with other For parks within short travel distance from an origin population, volume visits specific park...
A new control scheme of freewheeling current is proposed for switching DC-DC converters. The output voltage regulated by a comparator operation, and in the main loop, feedback-controlled to reference level average. converter loop no longer dependent on values inductor, capacitor, or load equivalent resistance. design compensator therefore greatly simplified response can be very fast approaching that hysteresis converter. As an example, single-inductor bipolar-output with implemented 0.5 mum...
We have reported on the synthesis of CuO nanostructures via a simple sol–gel approach with high yield at low cost by reduction aqueous solutions Cu(NO3)2 and Na2NO3. Synthesized were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis (EDX), fluorescence spectroscopy, Raman scattering UV-Vis-NIR spectroscopy. Structural studies revealed that prepared polycrystalline in nature monoclinic structure. The crystallite size was estimated to...
DC shipboard power systems have been considered as a promising solution for stricter environmental regulations on ships due to their main benefits in fuel savings with variable speed engines and easy integration of energy storage systems. In order employ the dc systems, be protected from system fault protection selectivity minimize impacts or avoid other undesirable situations system. For low-voltage three-level has proposed: 1) fast action (first)-bus separation by solid-state bus-tie...
In this paper, a load-independent converter with freewheeling current feedback, whose output is controlled by comparator, presented. This control method very useful for single-inductor multiple-output (SIMO) converters. A bipolar-output (SIBO) the proposed scheme implemented in 0.5 mum power BiCMOS process and uses 3.2 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> of die area. The sensing gain can be increased circuit less sensitive...
2-D numerical simulations are used to demonstrate the Z <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> -FET as a competitive embedded capacitor-less dynamic random access memory cell for low-power applications. Experimental results in 28-nm fully depleted-silicon on insulator technology validate prior downscaling tests. Default scaling, without any structure optimization, and enhanced scaling scenarios considered before comparing bit...
Abstract Lipase‐catalyzed direct polycondensation of L ‐malic acid ( ‐MA), adipic acid, and 1,8‐octanediol in organic media was achieved using Novozym 435 as the biocatalyst. 1 H‐nuclear magnetic resonance spectroscopy indicated that selectivity unaffected by changes media. The molecular weight M w ) copolymers affected ‐MA feed ratio diacids, hydrophobicity solvent, solubility substrates solvents. reached a maximum 17.4 kDa at 80°C isooctane diacids 40 mol %. increased from 3.2 to 16.6 when...
Crystallization temperatures, activation energies, and thermal diffusivities of In3Sb1Te2 (IST) Ge2Sb2Te5 (GST) are investigated with a differential scanning calorimetry, xenon laser flash, transmission electron microscopy. The energies for crystallizing the IST GST 5.2 eV 3.31 eV, respectively. diffusivity is about half GST. diffusion length in IST-phase change random access memory cell relatively shorter than due to lower diffusivity. Experimental results reveal that more thermally stable
We report a method of broadening the reflection bandwidth polymer-stabilized cholesteric liquid crystal (PSCLC). The top substrate was consecutively coated with polyimide (PI) and reactive mesogen (RM) layer, while bottom only PI. exposed RM coating to UV light. PSCLC samples where over-coated significantly broader than both substrates were In addition effect intensity gradient, RM-coated has chemical affinity bulk RM, promoting formation pitch gradient in sample.
Metal-insulator transition (MIT) in strongly correlated electronic materials has enormous potential with scientific and technological impacts future oxide nanoelectronic devices. Although photo-induced MIT can provide opportunities to extend the novel functionality of materials, there have rarely been reports on it. Here, we report provoked by visible-near-infrared light Ag-decorated VO2 nanorod arrays (NRs) because localized surface plasmon resonance (LSPR) its application broadband...
This article presents the characteristics of power supply protection in dc shipboard systems utilizing deexcitation a synchronous generator, which has been used to achieve breakerless scheme. From state-of-the-art analyses on and ship protection, analytical expressions short-circuit fault are introduced with consideration generator dynamics deexcitation. The rectifier based expression, is examined terms peak current (or nonrepetitive surge current) overloading capability limiting load...
Real-time liquid-cell transmission electron microscopy was utilized to gain insight into the growth and dissolution of silver nanoparticles.
The core/shell-structured upconversion nanophosphors (UCNPs) and Cd-free CuInS(2)/ZnS quantum dots (QDs) were synthesized via coprecipitation hot-injection methods, respectively, they applied to near infrared (NIR) photodetectors. β-NaYF(4):Yb,Er/β-NaYF(4) UCNPs emitted intense visible light peaking at 522, 542, 656 nm (2)H(11/2), (4)S(3/2), (4)F(9/2)→(4)I(15/2) transitions under excitation with 980 NIR light. core/shell showed 6.4 times higher emission intensity than core UCNPs. Charge...
This paper presents demonstration of a protection scheme integrated into marine DC power distribution networks to investigate the coordination between each action. The is based on three different time-frame actions: fast action - bus separation by solid-state bus-tie switch, medium feeder high-speed fuses, and slow supply generator deexcitation. As backup protection, AC fuses are installed generators rectifiers. To coordinate action, influences inductance in switch DC-link capacitance...