Time filter

Source Type

Daejeon, South Korea

The University of Science and Technology is a group of public universities and research institutions in Seoul, Suwon, Changwon, Ansan, Seongnam and Daejeon, in South Korea. The UST was established in 2003 by Korea's government as the nation’s graduate school specializing in science and engineering education and research. The UST runs only a graduate school. It is one of the top science and technology universities in South Korea along with KAIST and POSTECH. Creating the new driving force for growth would play a major role in leading national growth in the 21st century. The South Korean government established the UST to produce professionals in the field of combined technologies, thought of as one of the most important criteria for creating the driving force for South Korea's national growth. Today, UST continues to develop itself into a major research university. Wikipedia.

Lee W.,Korea Research Institute of Standards and Science | Lee W.,Korean University of Science and Technology | Park S.-J.,Korea Research Institute of Standards and Science
Chemical Reviews | Year: 2014

Many desirable engineering properties such as excellent hardness, corrosion, and abrasion resistance can be obtained by anodizing aluminum metals in acid electrolytes. In addition, due to its high porosity, the porous oxide films formed on the metals serve as a good adhesion base for electroplating, painting, and semi-permanent decorative coloration. Porous AAO film grown on aluminum is composed of a thin barrier oxide layer in conformal contact with aluminum, and an overlying, relatively thick, porous oxide film containing mutually parallel nanopores extending from the barrier oxide layer to the film surface. Each cylindrical nanopore and its surrounding oxide region constitute a hexagonal cell aligned normal to the metal surface. Under specific electrochemical conditions, the oxide cells self-organize into hexagonal close-packed arrangement, forming a honeycomb-like structure. Source

Han H.,Korea Research Institute of Standards and Science | Huang Z.,Jiangsu University | Lee W.,Korea Research Institute of Standards and Science | Lee W.,Korean University of Science and Technology
Nano Today | Year: 2014

Silicon nanostructures exhibit promising application potentials in many fields in comparison with their bulk counterpart or other semiconductor nanostructures. Therefore, the exploiting of controllable fabrication methods of silicon nanostructures, and the exploring of further applications of silicon nanostructures gain extensive attentions. In this review, recent advances in metal-assisted chemical etching of silicon, a low-cost and versatile method enabling fine control over morphology feature of silicon nanostructures, are summarized. The overview concerning the applications of silicon nanostructures in the field of energy conversion and storage, and sensors are also presented. © 2014 The Authors. Source

Seon K.-I.,Korea Astronomy and Space Science Institute | Seon K.-I.,Korean University of Science and Technology
Astrophysical Journal Letters | Year: 2012

Fractional Brownian motion structures are used to investigate the dependency of column density variance (σ2 ln N ) in the turbulent interstellar medium on the variance of three-dimensional density (σ2 ln ρ) and the power-law slope of the density power spectrum. We provide quantitative expressions to infer the three-dimensional density variance, which is not directly observable, from the observable column density variance and spectral slope. We also investigate the relationship between the column density variance and sonic Mach number (M s) in the hydrodynamic (HD) regime by assuming the spectral slope and density variance to be functions of sonic Mach number, as obtained from the HD turbulence simulations. They are related by the expression σ2 ln N = Aσln ρ 2 = Aln (1 + b 2 M 2 s), suggested by Burkhart & Lazarian for the magnetohydrodynamic case. The proportional constant A varies from ≈0.2 to ≈0.4 in the HD regime as the turbulence forcing parameter b increases from 1/3 (purely solenoidal forcing) to 1 (purely compressive forcing). It is also discussed that the parameter A is lowered in the presence of a magnetic field. © 2012. The American Astronomical Society. All rights reserved. Source

Subbiah R.,Korean University of Science and Technology
Journal of the Royal Society, Interface / the Royal Society | Year: 2013

Hybrids consisting of carboxylated, single-walled carbon nanotube (c-SWNT)-silver nanoparticles (AgNPs)-DNA-poly vinyl alcohol (PVA) are synthesized via sequential functionalization to mimic the theragnostic (therapy and diagnosis) system. Carboxylation of SWNT has minimized the metal impurities with plenty of -COOH groups to produce hybrid (c-SWNT-AgNPs). The hybrid is further wrapped with DNA (hybrid-DNA) and encapsulated with PVA as hybrid composite (HC). Materials were tested against human alveolar epithelial cells (A549), mouse fibroblasts cells (NIH3T3) and human bone marrow stromal cells (HS-5). The composition-sensitive physico-chemical interactions, biophysics and biomechanics of materials-treated cells are evaluated. The cell viability was improved for HC, hybrid-PVA and c-SWNT when compared with SWNT and hybrid. SWNT and hybrid showed cell viability less than 60% at high dose (40 μg ml(-1)) and hybrid-PVA and HC retained 80% or more cell viability. The treatment of hybrid nanomaterials considerably changed cell morphology and intercellular interaction with respect to the composition of materials. Peculiarly, PVA-coated hybrid was found to minimize the growth of invadopodia of A549 cells, which is responsible for the proliferation of cancer cells. Surface roughness of cells increased after treatment with hybrid, where cytoplasmic regions specifically showed higher roughness. Nanoindentation results suggest that changes in biomechanics occurred owing to possible internalization of the hybrid. The changes in force spectra of treated cells indicated a possible greater interaction between the cells and hybrid with distinct stiffness and demonstrated the surface adherence and internalization of hybrid on or inside the cells. Source

Chi S.-W.,Korea Research Institute of Bioscience and Biotechnology | Chi S.-W.,Korean University of Science and Technology
BMB Reports | Year: 2014

Reactivating the p53 pathway in tumors is an important strategy for anticancer therapy. In response to diverse cellular stresses, the tumor suppressor p53 mediates apoptosis in a transcriptionindependent and transcription-dependent manner. Although extensive studies have focused on the transcription-dependent apoptotic pathway of p53, the transcription-independent apoptotic pathway of p53 has only recently been discovered. Molecular interactions between p53 and Bcl-2 family proteins in the mitochondria play an essential role in the transcriptionindependent apoptosis of p53. This review describes the structural basis for the transcription-independent apoptotic pathway of p53 and discusses its potential application to anticancer therapy. Source

Discover hidden collaborations