김태훈 교수

Here we propose a concept of conductive dry adhesives (CDA) combining a gecko-inspired hierarchical structure and an elastomeric carbon nanocomposite. To complement the poor electrical percolation of 1D carbon nanotube (CNT) networks in an elastomeric matrix at a low filler content (∼1 wt %), a higher dimensional carbon material (i.e., carbon black, nanographite, and graphene nanopowder) is added into the mixture as an aid filler. The co-doped graphene and CNT in the composite show the lowest vo

Noble metal nanoparticle decoration is a representative strategy to enhance selectivity for fabricating chemical sensor arrays based on the 2-dimensional (2D) semiconductor material, represented by molybdenum disulfide (MoS 2 ). However, the mechanism of selectivity tuning by noble metal decoration on 2D materials has not been fully elucidated. Here, we successfully decorated noble metal nanoparticles on MoS 2 flakes by the solution process without using reducing agents. The MoS 2 flakes showed

Real-time animation of human-like characters is an active research area in computer graphics. The conventional approaches have, however, hardly dealt with the rhythmic patterns of motions, which are essential in handling rhythmic motions such as dancing and locomotive motions. In this paper, we present a novel scheme for synthesizing a new motion from unlabelled example motions while preserving their rhythmic pattern. Our scheme first captures the motion beats from the example motions to extract

Inkjet-printed single-walled carbon nanotube (SWCNT) thin films on stretchable substrates were developed, and their electrical properties were investigated. The 1- and 5-layer printed SWCNT thin films had sheet resistances of 169.76 and 19.08 Ω/sq, respectively, and maintained conductive properties under 100% tensile strain. A nitric acid treatment significantly improved the conductivity of the SWCNT electrodes, and after an initial increase, the 5-layer printed SWCNT electrodes showed a normali

A novel design concept of auxetic mechanical metamaterials is proposed to achieve controllable high sensitivity as well as good stretchability and durability of wire strain sensors. Semi-auxetic and contractile architectures are derived from an auxetic architecture and collected as three master units. To achieve an adjustable structural Poisson’s ratio (ν), patterned wire strain sensors with six units are constructed. Sensitivity of wire strain sensors is tuned by tailoring the ratio and locatio

A fully automatic method for descreening halftone images is presented based on convolutional neural networks with end-to-end learning. Incorporating context level information, the proposed method not only removes halftone artifacts but also synthesizes the fine details lost during halftone. The method consists of two main stages. In the first stage, intrinsic features of the scene are extracted, the low-frequency reconstruction of the image is estimated, and halftone patterns are removed. For th

Abstract Conductive thin films are typically subject to crack formation and propagation under tensile strain, turning into insulating films due to complete breakage at large strain. However, if such crack propagation can be intentionally designed, repetitive resistance change can be obtained and used for implementation of high-performance strain sensors that are suitable for biocompatible and stretchable electronic applications. In this work, therefore, we introduce a fiber-reinforced region, wh

The crystalline TiO 2 powders were prepared by highly reactive supercritical fluid with unique properties of both liquid and vapor phases. In this research, the effects of stirring and heating rates on the crystallization behavior of the TiO 2 powders were investigated. The crystalline size of the TiO 2 powders decreased from 90 to 60 nm as the stirring rate increased from 0 up to 150 rpm but increased to 160 nm with a further increase of the stirring rate to 400 rpm. The TiO 2 crystals tend to

Confocal Scanning Microscopy (CSM) is very useful to reconstruct 3D image of Bio-cells and the objects that have specification shape in higher axial and lateral resolution and widely used as measurement instrument. A 3D reconstruction is used to visualize confocal images and consists of following processes. The First process is to get 3D data by collecting a series of images at regular focus intervals (Optical Sectioning). The Second process is to fit a curve to a series of 3D data points each p

The change in resistance upon bending in metal films as thick as 1 mm used for underpanel force touch applications is limited by the low sensitivity, thus requiring high-performance readout circuitry. In this paper, we report inkjet-printed silver thin films having crack-inducing underlayers, which further increases the sensitivity of their resistance changes under deformation. This allows for detecting weak vertical forces even through the plates (force-receiving layer), such as 0.4 or 1.2 mm t

Abstract As CMOS scaling limit is reached, no-charge based devices and non-equilibrium systems need to be investigated as alternative switching units. We present a non-volatile nanoelectromechanical switch with state variable mechanical positioning of a single-walled CNT bundle suspended over metal electrodes deposited in dry-etched trenches. The switch is fabricated using a single mask fabrication process followed by dielectrophoresis-based directed assembly of the CNT bundle. The design exhibi

This study evaluated the synergistic effects of cosubstrate supplementation and powdered activated carbon (PAC) addition on enhancing anaerobic digestion (AD) performance under phenol-rich conditions. Batch experiments demonstrated that cosubstrate addition significantly improved methane production, with an optimal phenol-to- co -substrate ratio of 20:80 yielding 160 ± 14 mL CH 4 and 81 ± 7 mL/g COD. PAC addition further increased methane yield by 153% and COD removal efficiency by 158%, highlig