A5101533680- Optical Coatings and Gratings
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Near-Field Optical Microscopy
- Phosphorus and nutrient management
- Silk-based biomaterials and applications
- Environmental remediation with nanomaterials
- Embedded Systems and FPGA Design
- Bone Tissue Engineering Materials
- Electrospun Nanofibers in Biomedical Applications
- Advancements in PLL and VCO Technologies
- Polymer Surface Interaction Studies
- Electromagnetic Compatibility and Noise Suppression
- Nanopore and Nanochannel Transport Studies
- Engineering Applied Research
- Risk and Safety Analysis
- Block Copolymer Self-Assembly
- Force Microscopy Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Supramolecular Self-Assembly in Materials
- Quasicrystal Structures and Properties
- Environmental Policies and Emissions
- Adsorption and biosorption for pollutant removal
- Chemical Synthesis and Characterization
- Nanofabrication and Lithography Techniques
Yonsei University
2007-2024
Seoul National University
2014
Korea Institute of Ocean Science and Technology
2014
Korea Environmental Industry and Technology Institute
2014
A new Common-Mode (CM) choke with asymmetrical winding capable of attenuating Differential-Mode (DM) and noise for AC to DC Power Converters is proposed in this paper. For a conventional CM symmetrical winding, the DM are also attenuated by magnetizing inductance (LM) very small leakage (Lk) due higher coupling factor, respectively, choke. However, because number turns limited according shape size choke, it difficult find proper eliminate thoroughly. reason, bulky required larger (Lk)....
Abstract Bioprosthetic valves are employed to replace defective heart valves. However, structural degeneration is prevalent in bioprosthetic because the valve leaflets exposed extreme and repetitive cardiovascular pressure. Herein, a silk fibroin‐based leaflet, which executes physiological role of valve, developed. To this end, templated assembly technology Notably, physically optimal hierarchical structure for replacing natural leaflet realized by numerous firmly stacked β‐sheet crystals...
Abstract A theoretical model is introduced to evaluate the ultimate resolution of plasmonic lithography using a ridge aperture. The calculated and experimental results line array pattern depth are compared for various half pitches. analysis predicts that strongly depends on gap, achieving values under 1x nm with gap smaller than 10 nm. micrometer‐scale circular contact probe fabricated high speed patterning positioning accuracy, which can be extended high‐density array. Using probe, patterns...
In nanolithography using optical near-field sources to push the critical dimension below diffraction limit, optimization of process parameters is utmost importance. Herein we present a simple analytic model predict photoresist profiles with localized evanescent exposure that decays exponentially in finite contrast. We introduce concept nominal developing thickness (NDT) determine proper yields best topography profile fitting isointensity contour. Based on this model, experimentally...
Heart Valve Leaflets In article number 2307106, Sangmin Lee, Se Yong Jung, Jinkee Hong, and co-workers present a silk fibroin-based heart valve leaflet. Notably, it exhibits hierarchical structure physically optimal for replacing the natural An aortic composed of leaflets shows an excellent performance, demonstrating its potential as cost-effective reliable cardiovascular device.
Plasmonic lithography with a contact probe records nano-meter scale features and has high-throughput owing to its capability scan in mode. The is commonly based on micrometer-scale cantilever, which leads the tip-positioning problem due force-deflection that induces lateral tip displacement. We propose geometrically modified achieve high positioning accuracy. Contrary conventional cantilever-tip probe, we designed "circular probe" arc-shaped arms hold center. mechanism "fixed-fixed beam"...
The ultimate resolution of plasmonic lithography using a ridge aperture is evaluated theoretical model by Jae W. Hahn and co-workers on page OP337. A circular contact probe with high positioning accuracy fabricated to record density line array patterns half pitch up 22 nm. fits well the experimental results for pattern depth predicts be less than 10
Abstract This paper aims to report the fabrication of biodegradable thin films with micro‐domains cylindrical nanochannels through solvent‐induced microphase separation poly( L ‐lactide)‐ block ‐poly(ethylene glycol)‐ ‐poly( ‐lactide) (PLA‐ b ‐PEG‐ ‐PLA) triblock copolymers different ratios. In our experimental scope, an increase in each lengths PLA and PEG blocks led both a variation average number density (146 32 per 100 µm 2 ) size (140 427 nm). Analyses by atomic force microscopy (AFM)...
투수성 반응벽체 공법은 지하수 오염을 정화하는 대표적인 방법 중의 하나이다. 영양염류와 중금속 등 여러 가지 오염물질이 동시에 존재하는 경우 두 이상의 반응성 매질을 적용한 반응벽체공법으로 복합오염물질의 제거가 가능하다. 본 연구에서는 매질로 제올라이트와 제강슬래그를 함께 사용하는 제거능을 평가하였다. 영양염류인 암모늄과 인산염, 중금속인 카드뮴이 혼합된 복합오염물질에 대하여 연속회분식실험을 통하여 제올라이트 및 제강슬래그와의 반응순서에 따른 오염물질 분석하였다. 연속회분식실험 결과에 의하면 제올라이트-제강슬래그 순서로 반응하는 중금속의 대한 제거능이 더 좋은 것으로 나타났다. Permeable reactive barrier has been recognized as the one of representative methods for remediation contaminated groundwater. Reactive system containing two and more...
지하수 내에 영양염류와 중금속 등의 오염물질이 동시에 존재하는 경우 두 가지 이상의 반응성 매질을 적용한 연속식 반응벽체공법이 적용될 수 있다. 본 연구에서는 영양염류 오염물질인 암모늄과 인산염, 그리고 중금속인 카드뮴의 복합오염물질의 제거를 위해 제올라이트와 제강슬래그를 매질로 구성한 반응벽체공법의 적용성을 평가하였다. 흐름 조건을 모사한 주상실험을 수행하여 제강슬래그와의 연속반응에 의한 오염물질의 제거효과를 주상실험결과는 비평형 이류확산 모델을 적용하여 주상실험에서의 반응을 해석하였다. 통해 제올라이트는 암모늄 제거에 효과적이며 제강슬래그는 인산염과 카드뮴 효과적임을 확인하였으며, 반응벽체 구성 시 제강슬래그 순서로 반응시키는 조건이 효과적인 것으로 나타났다. The double sheeted permeable reactive barrier containing two different materials can be applied to remediate the...
Lattice structures are open composed of a periodic array beams or struts. They have been frequently used in automotive and aerospace industriesowing to their potential for better energy absorption ability superior mechanical properties while being lightweight. This study created 900 lattice cubic symmetry based on the atomic-level structural database found 625 stretch-dominant structures. The Young’s modulus structure was obtained via FEM tests along different loading directions with...
We suggest a geometrically modified probe to achieve high positioning accuracy for plasmonic lithography which can record nanometer scale features and has throughput. Instead of cantilever probe, we propose circular arc-shaped arms that hold the tip at center. The is based on fixed-fixed beam in material mechanics. To calculate displacement, used finite element method (FEM) compared results with probe. considered silicon-based micro-fabrication process design square outline boundary length...