SK Telecom

About: SK Telecom is a based out in . It is known for research contribution in the topics: Terminal (electronics) & Wireless. The organization has 1282 authors who have published 1238 publications receiving 15675 citations. The organization is also known as: Sunkyoung Telecom.

Microbial and biochemical basis of a Fusarium wilt-suppressive soil

Abstract: Crops lack genetic resistance to most necrotrophic pathogens. To compensate for this disadvantage, plants recruit antagonistic members of the soil microbiome to defend their roots against pathogens and other pests. The best examples of this microbially based defense of roots are observed in disease-suppressive soils in which suppressiveness is induced by continuously growing crops that are susceptible to a pathogen, but the molecular basis of most is poorly understood. Here we report the microbial characterization of a Korean soil with specific suppressiveness to Fusarium wilt of strawberry. In this soil, an attack on strawberry roots by Fusarium oxysporum results in a response by microbial defenders, of which members of the Actinobacteria appear to have a key role. We also identify Streptomyces genes responsible for the ribosomal synthesis of a novel heat-stable antifungal thiopeptide antibiotic inhibitory to F. oxysporum and the antibiotic's mode of action against fungal cell wall biosynthesis. Both classical- and community-oriented approaches were required to dissect this suppressive soil from the field to the molecular level, and the results highlight the role of natural antibiotics as weapons in the microbial warfare in the rhizosphere that is integral to plant health, vigor and development.

Rotation Invariant Localization of Duplicated Image Regions Based on Zernike Moments

Abstract: This paper proposes a forensic technique to localize duplicated image regions based on Zernike moments of small image blocks. We exploit rotation invariance properties to reliably unveil duplicated regions after arbitrary rotations. We devise a novel block matching procedure based on locality sensitive hashing and reduce false positives by examining the moments' phase. A massive experimental test setup benchmarks our algorithm against state-of-the-art methods under various perspectives, examining both pixel-level localization and image-level detection performance. By taking signal characteristics into account and distinguishing between “textured” and “smooth” duplicated regions, we find that the proposed method outperforms prior art in particular when duplicated regions are smooth. Experiments indicate high robustness against JPEG compression, blurring, additive white Gaussian noise, and moderate scaling.

An empirical investigation of mobile data service continuance: Incorporating the theory of planned behavior into the expectation-confirmation model

Abstract: Due to the rapid growth of mobile data service (MDS), research into MDS continuance has recently emerged as an important issue in information systems (IS) and marketing literature. This study develops an integrated model designed to predict a user's continuance behavior toward MDS based on the expectation-confirmation model (ECM) and the theory of planned behavior (TPB). Empirical data collected from 207 users who had prior experience with MDS and was tested against the proposed research model using structure equation modeling. Analysis results show that user satisfaction, perceived usefulness, perceived enjoyment, and perceived fee are an important part of the formation of MDS continuance intention. Furthermore, the two components of the TPB, subject norm and perceived behavioral control, also have a significant impact on MDS continuance intention. Overall, this study provides evidence that an integrated model has a better explanatory power of MDS continuance compared to either model considered alone.