Kwangwoon University

About: Kwangwoon University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Thin film & Resonator. The organization has 4020 authors who have published 8217 publications receiving 104365 citations.

Apparatus and method for encoding and decoding moving picture using adaptive scanning

Abstract: Provided is an apparatus and method for encoding/decoding moving pictures based on adaptive scanning. The moving picture apparatus and method can increase a compression rate based on adaptive scanning by performing intra prediction onto blocks of a predetermined size, and scanning coefficients acquired from Discrete Cosine Transform (DCT) of a residue signal and quantization differently according to the intra prediction mode. The moving picture encoding apparatus includes: a mode selector for selecting and outputting a prediction mode; a predictor for predicting pixel values of pixels to be encoded of an input video based on the prediction mode to thereby output a residue signal block; a transform/quantization unit for performing DCT onto the residue signal block and quantizing the transformed residue signal block; and an encoder for adaptively scanning and encoding the quantized residue signal block based on the prediction mode.

In Situ Forming and H2O2-Releasing Hydrogels for Treatment of Drug-Resistant Bacterial Infections

Abstract: Various types of commercialized wound dressings (e.g., films, foams, gels, and nanofiber meshes) have been clinically used as a physical barrier against bacterial invasion and as wound-healing materials. Although these dressings can protect the wounded tissue from the external environment, they cannot treat the wounds that are already infected with bacteria. Herein, we report in situ H2O2-releasing hydrogels as an active wound dressing with antibacterial properties for treatment of drug-resistant bacterial infection. In this study, H2O2 was used for two major purposes: (1) in situ gel formation via a horseradish peroxidase (HRP)/H2O2-triggered cross-linking reaction, and (2) antibacterial activity of the hydrogel via its oxidative effects. We found that there were residual H2O2 in the matrix after in situ HRP-catalyzed gelling, and varying the feed amount of H2O2 (1–10 mM; used to make hydrogels) enabled control of H2O2 release kinetics within a range of 2–509 μM. In addition, although the gelatin-hydroxy...

Digital predistortion linearizes wireless power amplifiers

Abstract: When compared to other linearization methods, adaptive DP provides sufficient linearization with less complex RF hardware by depending primarily upon DSP rather than analog manipulation. The adaptive DP system may be implemented in EDA software along with interconnected test equipment (arbitrary RF signal source and vector signal analyzer). Through the use of a training signal, a simple adaptive algorithm may be employed to update the LUT coefficients until an optimum setting is achieved and used to predistort the input to the amplifier. This "connected solution" approach can provide key information to design engineers for optimizing the DSP architecture of a PA. For future work, other issues are taken into account, such as temperature and electrical memory effects.

Antimicrobial activity of silver nanoparticles

Abstract: Recently, silver nanoparticles (Ag NPs) have been recognized as potential candidates for the generation of novel antimicrobial agents. It is very important to create nanomaterials-based drug delivery carriers with antimicrobial behavior that may provide novel platforms for the treatment of various antimicrobial diseases. In this book chapter, we summarize the current status of Ag NPs technology for antimicrobial treatment and associated infectious diseases. The antimicrobial activity of silver nanoparticles along with the underlying mechanism will also be addressed; for instance, how does the size of metal nanoparticles play an important role in the inactivation of the microorganisms (bacteria, fungi, and viruses). Overall, this chapter offers an overview of the amazing achievements by Ag NPs in terms of antimicrobial properties on various microbial species.