A5100616371- Microfluidic and Bio-sensing Technologies
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Microfluidic and Capillary Electrophoresis Applications
- Electrowetting and Microfluidic Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- 3D Printing in Biomedical Research
- Force Microscopy Techniques and Applications
- Cancer Cells and Metastasis
- Advanced Sensor and Energy Harvesting Materials
- Photonic and Optical Devices
- Ecology and Conservation Studies
- Acoustic Wave Resonator Technologies
- Plant and animal studies
- Electrohydrodynamics and Fluid Dynamics
- Advanced Surface Polishing Techniques
- Advanced Fiber Optic Sensors
- Tactile and Sensory Interactions
- 3D IC and TSV technologies
- Adhesion, Friction, and Surface Interactions
- Nanofabrication and Lithography Techniques
- Innovative Energy Harvesting Technologies
- Electrostatics and Colloid Interactions
- Electrical and Bioimpedance Tomography
- Piezoelectric Actuators and Control
Korea Advanced Institute of Science and Technology
2014-2024
Korea Institute of Materials Science
2023
Seoul National University
2023
Daewoo Shipbuilding and Marine Engineering (South Korea)
2023
Seoul National University Bundang Hospital
2017-2023
Korea Institute of Brain Science
2023
Daegu Fatima Hospital
2008-2022
Yonsei University
2022
Daejeon University
2006-2021
Government of the Republic of Korea
2016-2021
Multi-dye-sensitized upconverting nanoparticles (UCNPs), which harvest photons of wide wavelength range (450–975 nm) are designed and synthesized. The UCNPs embedded in a photo-acid generating layer integrated on destructible nonvolatile resistive memory device. Upon illumination light, the system permanently erases stored data, achieving enhanced information security. As service to our authors readers, this journal provides supporting supplied by authors. Such materials peer reviewed may be...
Viscous energy loss in oscillating fluid-film dampers that provide frictional shear for laterally-driven planar microstructures is investigated. It found Stokes-type fluid motion models viscous damping more accurately than Couette-type flow field. This paper characterizes the property of a layer terms dissipation, then derives analytic formulae practical Q estimation. Theoretical Q-factors are compared to experimental values, measured from surface-micromachined polysilicon resonators. Data...
Abstract A human stress monitoring patch integrates three sensors of skin temperature, conductance, and pulsewave in the size stamp (25 mm × 15 72 μm) order to enhance wearing comfort with small contact area high flexibility. The is minimized through invention an integrated multi-layer structure associated microfabrication process; thus being reduced 1/125 that conventional single-layer multiple sensors. flexibility increased mainly by development flexible sensor, made a piezoelectric...
We present a microfluidic device for the capture and release of circulating exosomes from human blood.
We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances applicability. Previous using require manual process or high-power bulky actuators to lift detection chambers above skin for continuous measurement. The proposed reduce operation power minimizing expansion fluid volume 0.4 ml through heat circuit modeling. 12.8% weight 47.6% compared previous portable sensors,...
Lanthanide-doped upconverting nanoparticles (UCNPs, NaYF4:Yb(3+),Er(3+)) are well known for emitting visible photons upon absorption of two or more near-infrared (NIR) through energy transfer from the sensitizer (Yb(3+)) to activator (Er(3+)). Of emission bands (two green and one red band), it has been suggested that results competing upconversion pathways where non-radiative relaxation occurs after second (pathway A, (4)I15/2 → (4)I11/2 (4)F7/2 (2)H11/2 (4)S3/2 (4)F9/2 (4)I15/2) between...
The purpose of the current study was to investigate incidence preoperative deep vein thrombosis (DVT) after hip fractures in Korea.In this prospective study, we enrolled 152 Korean geriatric patients who had suffered due a simple fall and were hospitalized between January 2013 December 2013. There 52 male 100 female patients, their mean age 78.2 years. 96 trochanteric 56 femoral neck fractures. All examined for DVT: 26 by ultrasonography 126 computed tomography venography. having DVT...
We present a three-dimensional (3D) particle focusing channel using the positive dielectrophoresis (pDEP) guided by dielectric structure between two planar electrodes. The electrodes induces maximum electric field at center of microchannel and particles are focused to pDEP as they flow from single sample injection port. Compared previous 3D methods standing surface acoustic wave (SSAW), hydrodynamic force, negative (nDEP), device achieves simple effective function without any additional...
We present passive flow-rate regulators using an autonomous deflection of parallel membrane valves, capable to maintain a constant at varying inlet pressure supplied from micropumps. The previous are difficult integrate with micropumps, not only because the complex multi-layer structures, but also high threshold required for regulation. In this study, we achieving regulation function minimum as low 15 kPa simple structure formed by single mask process. membranes in regulator designed deflect...
This paper presents a multicellular spheroid chip capable of forming and extracting three-dimensional (3D) spheroids using removable cell trapping barriers. Compared to the conventional macro-scale formation methods, including spinning, hanging-drop, liquid-overlay recent micro-scale chips have advantage smaller with better uniformity. The micro chips, however, difficulties in due fixed present chip, having two PDMS layers, uses barriers, thereby making it easy form extract uniform...
Scholars of democratization have developed a variety theories to explain national and cross-national differences in democratic support. These theories, however, pay little attention the cognitive origin This study seeks examine how informed understanding about democracy affects such To this end, it applies institutional legitimacy social learning predicts that relationship between citizen support for is not only positively concaved but also dependent on historical experience democracy. An...
The grafting of poly(ethylene glycol) (PEG) onto an SU8 microfilter has been demonstrated for efficient capture and release circulating tumor cells (CTCs). Previous CTC filters showed low cell efficiency due to hydrophobic surfaces, even though their was considerable. PEG, a hydrophilic polymeric compound mainly used form nonfouling thin films on silicon induces repulsive force so that the nonspecific adsorption surface is incomparably reduced in comparison with unmodified filter surfaces....
Abstract The present research proposes the porous polydimethylsiloxane (PDMS) layer for skin trouble reduced daily life attachable devices. new pores forming method in PDMS by crystallization and dissolution of citric acid fabricating high uniform small size pores. (i) decreases pore 93.2%p increases uniformity 425%p compared to conventional mixing sugars PDMS; (ii) is able be fabricated thickness 21–101 µm spin-coating; (iii) has 2.2 times higher water vapor transmission rate (947 ± 10.8...
We present a continuous size-dependent particle separator using negative dielectrophoretic (DEP) virtual pillar array. Two major problems in the previous separators include clogging mechanical sieving structures and fixed range of separable sizes. The uses array generated by DEP force instead array, thus eliminating problems. It is also possible to adjust size particles since pillars function diameter, applied voltage, flow rate, etc. At an voltage 500 kHz, 10 Vrms (root mean sqaure voltage)...
We present a clinical device for simple, rapid, and viable isolation of circulating tumor cells (CTCs) from cancer patient bloods.In spite the importance CTCs, lack easy non-biased methods is big hurdle implementing CTC into use.The made photosensitive polymer was designed to attach conventional syringe isolate CTCs at minimal resources.Its unique tapered-slits on filter are capable not only cell based their size deformability, but also increase sample flow rate, thus achieving label-free...
Circulating tumor cells (CTCs) have received enormous attention as a novel biomarker in various malignant diseases. We investigated the clinical association between presence of perioperative CTCs and survival outcomes women with ovarian cancer. In total 30 who were scheduled to undergo surgical treatment for cancer, peripheral blood samples obtained before after surgery. isolated counted using optimized tapered-slit filter (TSF) platform. The features was evaluated. impact on...