Qingdao University

About: Qingdao University is a education organization based out in Qingdao, China. It is known for research contribution in the topics: Cancer & Apoptosis. The organization has 35675 authors who have published 27275 publications receiving 374908 citations. The organization is also known as: Qīngdǎo Dàxué.

Mobile Internet of Things Under Data Physical Fusion Technology

Abstract: In order to investigate security and privacy issues in the mobile Internet of Things (IoT), the access control four states (AC4E) IoT model is constructed, data physical fusion technology is adopted, and simulation experiments are conducted to explore its performance in terms of optimal response path, trust mechanism, and privacy rate. The results show that AC4E has good reactivity, correctness, security, parallel processing, and other characteristics in the analysis of the optimal response path, trust mechanism, and security rate. The AC4E trust model can be used to isolate the influence of “malicious” nodes and reduce the energy loss of the system. Further analysis of its secrecy rate shows that when the number of iterations is 5, nodes at different positions can maximize the secrecy performance of the system according to different power distribution. Therefore, the application of data physical fusion technology in the mobile IoT can effectively improve the security and privacy performance of the network, and provide a certain experimental reference for the improvement of the performance of the mobile IoT in the later stage, which has important research significance.

Gelatin/alginate composite nanofiber membranes for effective and even adsorption of cationic dyes

Abstract: Nanofiber membranes from natural alginate are ideal adsorption materials for removing cationic dyes in solution, yet the regulations to their adsorption and desorption properties are of great challenges. In this research, gelatin/calcium alginate (GA) composite nanofiber membranes were successfully prepared via electrospinning to resolve these issues. The structural changes of composite membranes induced by the gelatin addition were confirmed by SEM, FT-IR and BET analysis. The enhanced mechanical strength of GA membranes disclosed the strong interactions between gelatin and alginate chains. Taking methylene blue (MB) as the model cationic dye, it was found the resultant composites could slow down the adsorption rate and obviously improve the adsorption evenness without apparent influences on its adsorption capacity. Moreover, the gelatin modification would generate better reusability for the composite membranes during a serial of adsorption and desorption cycles for strong electrostatic repulsions induced by protonated amino groups in gelatin chains. This effective composite strategy would pave the way for the development of natural alginate to the next generation high-performance adsorbent for cationic dyes.

Onset of breast and pubic hair development and menses in urban chinese girls.

Abstract: Objectives To determine the current prevalence and mean ages of onset of pubertal characteristics in healthy urban Chinese girls. Methods A cross-sectional study of sexual maturation of healthy Chinese girls was conducted in 9 representative cities of the eastern, western, southern, and northern parts and central region of China between 2003 and 2005. At examination, stages of breast and pubic hair development were rated on girls 3 through 19.83 years of age, and height and weight were also recorded. Data on menses were collected by the status quo method. Probit analysis was used to calculate the median age and 95% confidence interval (CI) for onset of breast and pubic hair development and menarche. Results Data were analyzed for 20654 apparently healthy girls. At age 8 years, 19.57% of these girls had evidence of breast development. The median ages of onset of Tanner stages 2 and 3 for breast development were 9.20 (95% CI: 9.06-9.32) years and 10.37 (95% CI: 10.28-10.45) years, respectively. The median ages of onset of Tanner stages 2 and 3 for pubic hair development were 11.16 (95% CI: 11.03-11.29) years and 12.40 (95% CI: 12.25-12.55) years, respectively. Menses occurred at 12.27 years (95% CI: 12.16-12.39). Conclusions These data suggest that urban Chinese girls are actually experiencing earlier breast development than currently used norms. The up-to-date reference for normal pubertal development in urban Chinese girls needs to be established for the purpose of determining precocious puberty or pubertal delay.

A Survey of Opportunistic Offloading

Abstract: This paper surveys the literature of opportunistic offloading. Opportunistic offloading refers to offloading traffic originally transmitted through the cellular network to opportunistic network, or offloading computing tasks originally executed locally to nearby devices with idle computing resources through opportunistic network. This research direction is recently emerged, and the relevant research covers the period from 2009 to date, with an explosive trend over the last four years. We provide a comprehensive review of the research field from a multi-dimensional view based on application goal, realizing approach, offloading direction, etc. In addition, we pinpoint the major classifications of opportunistic offloading, so as to form a hierarchical or graded classification of the existing works. Specifically, we divide opportunistic offloading into two main categories based on application goal: traffic offloading or computation offloading. Each category is further divided into two smaller categories: with and without offloading node selection, which bridges between subscriber node and the cellular network, or plays the role of computing task executor for other nodes. We elaborate, compare, and analyze the literatures in each classification from the perspectives of required information, objective, etc. We present a complete introductory guide to the researches relevant to opportunistic offloading. After summarizing the development of the research direction and offloading strategies of the current state-of-the-art, we further point out the important future research problems and directions.