Kyungpook National University

About: Kyungpook National University is a education organization based out in Daegu, South Korea. It is known for research contribution in the topics: Population & Catalysis. The organization has 20497 authors who have published 42107 publications receiving 834608 citations.

Plant growth-promoting rhizobacteria reduce adverse effects of salinity and osmotic stress by regulating phytohormones and antioxidants in Cucumis sativus

Abstract: We assessed the role of plant growth-promoting rhizobacteria (PGPR) strains viz. Burkholdera cepacia SE4, Promicromonospora sp. SE188 and Acinetobacter calcoaceticus SE370 in counteracting salinity and drought stress to cucumber plants. The control plants had stunted growth, while PGPR-treated plants had significantly higher biomass and chlorophyll contents under salinity and drought stress. The ameliorative effects of PGPR-application were also evidenced by the increased water potential and decreased electrolytic leakage. The PGPR-applied plants had reduced sodium ion concentration, while the potassium and phosphorus were abundantly present as compared to control under stress. Oxidative stress was mitigated by PGPR through reduced activities of catalase, peroxidase, polyphenol oxidase, and total polyphenol as compared to control. The control plants showed up-regulation of stress-responsive abscisic acid as compared to PGPR application, while salicylic acid and gibberellin 4 were significantly higher in P...

People matter: commitment to employees, strategy and performance in Korean firms

Abstract: The human element of enterprise is argued to be a vital resource for strategy execution. We show in a study of Korean businesses how an organization’s commitment to its employees’ well-being (OCE) can aid in the profitable execution of its positioning strategies. We found that OCE, by itself, sometimes has a weakly positive association with return on assets (ROA). But far more important, we found that ROA is strongly and positively influenced by the interaction between OCE and the dedicated pursuit of Porter’s (1980) strategies for achieving competitive advantage: these are cost leadership, marketing differentiation and innovative differentiation. In short, dedicated positioning strategies appear to be executed more effectively where organizations exhibit a high level of commitment to their employees; and conversely, OCE is apt to have a strong impact on ROA only in the context of a dedicated, that is intensive and thorough, positioning strategy. Copyright © 1999 John Wiley & Sons, Ltd.

Identifying and ranking influential spreaders in complex networks by neighborhood coreness

Abstract: Identifying influential spreaders is an important issue in understanding the dynamics of information diffusion in complex networks. The k-shell index, which is the topological location of a node in a network, is a more efficient measure at capturing the spreading ability of a node than are the degree and betweenness centralities. However, the k-shell decomposition fails to yield the monotonic ranking of spreaders because it assigns too many nodes with the same k-shell index. In this paper, we propose a novel measure, coreness centrality , to estimate the spreading influence of a node in a network using the k-shell indices of its neighbors. Our experimental results on both real and artificial networks, compared with an epidemic spreading model, show that the proposed method can quantify the node influence more accurately and provide a more monotonic ranking list than other ranking methods.