- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Microbial Metabolites in Food Biotechnology
- Nanomaterials and Printing Technologies
- Gut microbiota and health
- Probiotics and Fermented Foods
- Environmental Toxicology and Ecotoxicology
- Organic Light-Emitting Diodes Research
- Constructed Wetlands for Wastewater Treatment
- Interactive and Immersive Displays
- Food composition and properties
- Organic Electronics and Photovoltaics
- Tactile and Sensory Interactions
- Advanced Materials and Mechanics
- Advanced optical system design
- Nanofabrication and Lithography Techniques
- Biocrusts and Microbial Ecology
- Advanced Optical Imaging Technologies
- Additive Manufacturing and 3D Printing Technologies
- Advanced Battery Materials and Technologies
- Tea Polyphenols and Effects
- Educational Robotics and Engineering
- Optical Coatings and Gratings
- Adaptive optics and wavefront sensing
- Water Quality and Pollution Assessment
Gachon University
2025
Seoul National University
2019-2024
Chungbuk National University
2020-2024
Incheon National University
2020-2023
Ghent University Global Campus
2023
Hanbat National University
2023
Korea Basic Science Institute
2017
Abstract A stretchable display would be the ultimate form factor for next generation of displays beyond curved and foldable configurations that have enabled commercialization deformable electronic applications. However, because conventional active devices are very brittle vulnerable to mechanical deformation, appropriate strategies must developed from material structural points view achieve desired stretchability without compromising electrical properties. In this regard, remarkable findings...
Abstract Inkjet and transfer printing processes are combined to easily form patterned poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films as top anodes of all solution–processed inverted polymer light emitting diodes (PLEDs) on rigid glass flexible plastic substrates. An adhesive PEDOT:PSS ink is formulated fully customizable patterns obtained using the inkjet process. In order films, adhesion properties at interfaces during multistep carefully adjusted. The transferred...
The aim of this study was to investigate the prebiotic activities dextran (LM742) produced by Leuconostoc mesenteroides SPCL742 in aspect human gut microbial ecosystem focusing on microbiome and metabolome changes vitro colonic fermentation. LM742 had a medium-chain structure with molecular weight 1394.87 kDa (DP = 7759.22) α-1,6 α-1,3 linkages 26.11 : 1 ratio. resistent digestive enzymes gastrointestinal conditions. individual cultivation 30 intestinal bacteria showed growth Bacteroides...
Fructooligosaccharides (FOS), Ad-fructooligosaccharides (Ad-FOS), resistant maltodextrin (RMD), and maltooligosaccharides (MOS) are commercially available prebiotic oligosaccharides. In this study, the effects of prebiotics on human gut microbial ecosystem were evaluated using an in vitro model. FOS Ad-FOS showed tolerance to digestion, whereas RMD MOS moderate digestion by digestive enzymes. fecal fermentation, Bifidobacterium spp. increased following order: FOS, Ad-FOS, MOS, RMD,...
As a prominent next-generation anode material for high-capacity applications, silicon stands out due to its potential. Crystalline silicon, which offers higher initial capacity compared amorphous counterpart, presents challenges in practical applications poor cycling performance. In this study, we prepared composites of crystalline and with graphite, assembled pouch-type full cells, evaluated their suitability use. The incorporating demonstrated superior performance at both high low rates,...
Abstract Silver nanowires (AgNWs) have been considered as replacements of indium tin oxide (ITO) due to superior optoelectronic properties and mechanical stability for flexible electronics. However, high cost process complexity patterning disturb their applicability commercial products. Herein, a facile method AgNWs by using inkjet‐printed conductive polymer templates is developed, which can be applied on various surfaces including super hydrophobic light‐emitting organic layer. Combination...
Abstract We previously proposed the Gut Microbiome Wellness Index (GMWI), a predictor of disease presence based on gut microbiome taxonomic profile. As an application this index for food science research, we applied GMWI as quantitative tool measuring prebiotic effect oligosaccharides. Mainly, in vitro anaerobic batch fermentation system, fructooligosaccharides (FOS), galactooligosaccharides (GOS), xylooligosaccharides (XOS), inulin (IN), and 2’-fucosyllactose (2FL), were mixed separately...
Electronic skin (E-skin) based on tactile sensors has great significance in next-generation electronics such as biomedical application and artificial intelligence that requires interaction with humans. To mimic the properties of human skin, high flexibility, excellent sensing capability, sufficient spatial resolution through high-level sensor integration are required. Here, we report a highly sensitive pressure matrix piezoresistive cellulose/single-walled carbon nanotube-entangled fiber...
Toxicity tests represent a rapid, user-friendly and cost-effective means to assess the impact of wastewater quality on aquatic ecosystems. There are not many cases where management standards set based various bio-based ecotoxicity values. Here, we tested novel multitaxon approach compare standard water indices toxicity metrics obtained from tests, conducted using organisms representing several trophic levels (Aliivibrio, Ulva, Daphnia, Lemna), for 99 industrial samples South Korea. For five...
The common duckweed (Lemna minor), a freshwater monocot that floats on the surfaces of slow-moving streams and ponds, is commonly used in toxicity testing. novel Lemna root- regrowth test performed replicate vessels (24-well plates), each containing 3 mL solution 2-3 frond colony. Prior to exposure, roots are excised from plant, newly developed measured after days regrowth. Compared three internationally standardized methods, this bioassay faster (72 h), simpler, more convenient (requiring...
Laphet, fermented green tea leaves (Camellia sinensis) consumed as a dish in Myanmar, is one of the most efficient ways to synchronously intake polyphenols and dietary fibers. This study aimed investigate health-promoting properties Laphet using vitro digestion fecal fermentation models. After gastrointestinal conditions, retained its polyphenol content antioxidant activities at significant levels: 64 % catechin, 30 %–50 ABTS, 10 %–30 DPPH activity. In fermentation, digested fractions, (P),...
High-fidelity patterning of thin metal films on arbitrary soft substrates promises integrated circuits and devices that can significantly augment the morphological functionalities freeform electronics. However, existing methods decisively rely prefabricated rigid masks are severely incompatible with myriad surfaces. Here, we report printable, stretchable metal-vapor-desorption layers (s-MVDLs) enable high-fidelity polymeric The printed rubbery matrix highly mobile chains effectively repels...
The common, broad-spectrum herbicide diuron poses some risks to the environment due its long persistence and high toxicity. Therefore, effective monitoring of residues will inform efforts assess impacts on ecosystems. In this study, we evaluated toxicity targets in model aquatic macrophyte Lemna minor at physiological (growth photosynthetic efficiency), biochemical (pigment biosynthesis reactive oxygen species (ROS) levels), molecular (rbcL transcript) levels. was detectable after 48 h...
Recent studies on logical reasoning in auto-regressive Language Models (LMs) have sparked a debate whether such models can learn systematic principles during pre-training or merely exploit superficial patterns the training data. This paper presents mechanistic interpretation of syllogistic LMs to further enhance our understanding internal dynamics. Specifically, we present methodology for circuit discovery aimed at disentangling content-independent mechanisms from world knowledge acquired...
We aimed to identify functional differences between different sections of the thallus Ulva australis and develop tissue-endpoint combinations assess toxicity six metals (i.e., Ag, As, Cd, Cr, Cu, Ni). EC50 values for these in three were obtained multiple endpoints: relative growth rate (RGR), chlorophyll a fluorescence, pigment contents, expression photosynthesis-related gene, rbcL. The responses endpoints varied across respective sections; overall, most toxic Ag Cu. These best evaluating...
Implementing the multilayered structure on a stretchable platform is essential to realize multifunctional system beyond simply imparting stretchability single rigid device. There have been many efforts achieve vertical interconnect access (VIA) for electrical connections between two or more different layers electronics. Nevertheless, there are still challenges in implementing soft systems with VIA due high complexity of fabrication process, limitations circuit design, and poor compatibility...
We report the whole-genome sequence of Lactobacillus plantarum SPC-SNU 72-2, a probiotic starter for sourdough. Genome sequencing was completed using Pacific Biosciences RS II and Illumina platforms. This study will facilitate understanding microbial characteristics L. 72-2 its roles during sourdough fermentation.
By the combination of inkjet printing PEDOT:PSS transfer template and selective silver nanowires (AgNW), AgNWs customizable transparency can be patterned with high degree freedom, without need equipment cost complicated process. The AgNW-transferred transparent electrodes exhibit both great figure merit easily tunable optoelectronic properties. With maintaining advantages overcoming issues AgNWs, method developed by Yongtaek Hong co-workers in article number 2000042 applied to various...
Digital image correlation(DIC) analysis is rooted in a well‐formed speckle pattern, and the spray technique widely utilized due to its decent unpredictability. However, there are clear limitations using for high‐precision DIC analysis. Herein we provide novel approach creating pattern an elastomeric stencil mask with uniformly sized perforations. As result, not only can ideal be obtained, but also individual sizes easily changed. Most importantly, conformably mounted variety of 3‐D curved...
A facile method for designing and fabricating a concave mirror from 3D printed mold is proposed seamless modular curved-edge display. The placed on the seam of display, thereby reflecting images at area toward observer direction. By investigating structures based parametric modeling, we obtain continuous image in display by optically concealing seam. We also analyze luminance distribution viewing angle to show capability mirror.
Progress in development of a multiple-order diffractive engineered (MODE) lens as applied to space telescopes, where an ultralightweight primary is used instead mirror, presented. Precision glass molding fabricate prototype 0.24 m diameter lens, and advanced alignment technology bond segments into ridged, monolithic structure. The f/4.17 telescope with color corrector that provides diffraction-limited imaging over the astronomical R-band wavelengths (589 nm 727 nm) +/- 0.125° field view....
Stretchable Displays In article number 2201067, Yeongjun Lee, Yongtaek Hong, Youngjun Yun, and co-workers review recent developments in advanced materials feasible strategies for the realization of stretchable electronic devices displays, which will be ultimate form factor next-generation displays. Various matrix displays as well future prospect active are discussed.
The world's optical parts market is entering a phase of free-form optics beyond existing aspherical optics.Demand for ultraprecision system exploding in high-tech industries such as astronomical telescopes, high-powered lasers, satellites, unmanned equipment, wearable devices, and automobiles.To meet this demand, the Korea Basic Science Institute (KBSI) has opened Ultra Precision Tech Shop (UPTS), world-class precision processing facility.The UPTS utilizes KBSI equipment to carry out...