Distributed Full Coverage WSN Protocol Based on Energy Self-Aware

Li Shuqiang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.9

With maximizing the coverage time by designing effective algorithm being the core problem for large-scale network, a kind of distributed energy-aware and coverage-aware full-coverage WSN routing protocol (DEAOP) is proposed in this paper. Protocol put forward in this paper adopts the cluster technology. Firstly, divide the sensor nodes into different clusters, with each cluster selecting the cluster head (CH) according to residual energy of the nodes and overlapping degree of the coverage area, and other nodes serve as member nodes of the cluster. Secondly, establish the main data transmission line constituted by cluster head CH. The transmitted data, together with the cluster head CH, is applied to calculate the cost of neighbor cluster head, and nodes with higher cost can be taken as the forwarding node for next group of data. The cost function contains relevant information on residual energy of the nodes and path loss; hence, the higher the cost is, the greater the residual energy and the lower the path loss will be. In this case, nodes with less residual energy will not become invalid prematurely due to being selected as the cluster head CH, thus avoiding the resulting short service life of network and balancing the network energy consumption. Finally, simulate the protocol and analyze its performance in network service life, coverage rate and energy consumption. The simulation results indicate that protocol proposed in this paper can lower the energy consumption and prolong the network service life, thus improving the coverage rate.

Study on Preparation of Core-Spun Yarn Surgical Sutures by Compositing Drug-Loaded Nanofiber Membrane with PLA and Its Controllable Drug Release Performance

Zhichao Yang,Shuqiang Liu,Jingjing Li,Gaihong Wu,Man Zhang,Fu Li,Lu Jia,Yujing Zhang,Huimin Li,Xia Liu,Jingjing Zhao,Huiqin Zhang,Shiyu Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

Polylactic acid (PLA) surgical suture is considered to be one of the most ideal materials for tissue closure due to its rich raw materials and excellent biological properties. However, surgical sutures face great challenges due to problems such as wound infection and tissue reaction in practical applications. In order to improve the clinical applicability of surgical sutures, we constructed a new drug-loading system for core-spun surgical sutures. The shell was composed of nanofibrous membranes composed of polyglycolic acid (PGA) and polycaprolactone (PCL) and ciprofloxacin (CIP) antibacterial drugs, and the core layer adopts PLA filament. By adjusting the composition ratio of PGA and PCL in the shell, a new mode of regulating the release rate and release cycle of the suture was constructed. According to different wound healing time, different drug release cycles of surgical suture were selected. In the study, the structure of the core-spun yarn can be clearly observed by scanning electron microscope, the higher the shell PGA content and drug loading, the faster the drug release rate. When the carrier ratio PGA/PCL was 80/20 and the drug loading was 3%, the drug release rate was the fastest and the drug release was high; finally, antibacterial experiments showed that the suture had excellent antibacterial effect and could effectively kill Staphylococcus aureus and Escherichia coli. The successful preparation of core-spun yarn surgical suture provides a new idea for the study of new antibacterial surgical suture.

Acteoside reduces testosterone by inhibiting cAMP, p450scc, and StAR in rat Leydig cells

Shuqiang Liu,Junwen Zhang,Weixuan Li,Tianxiang Zhang,Defu Hu 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.1

The present study investigated the in vivo and in vitro effects of acteoside on testosterone production in Sprague-Dawley (SD) rats. The in vivo experiment revealed that acteoside reduced the testosterone level in serum significantly (P⁄0.05). The in vitro experiment also illustrated that acteoside significantly reduced testosterone production in SD rat Leydig cells in primary culture (P⁄0.05). Enzyme-linked immunosorbent assay results demonstrated that acteoside significantly reduced the cyclic adenosine 3′, 5′-monophosphate (cAMP) level (P⁄0.05), and Western blot analysis showed that acteoside significantly reduced cholesterol side-chain cleavage enzyme (p450scc) and steroidogenic acute regulatory (StAR) expression (P⁄ 0.05). Hoechst 33342 staining and Western blotting showed that acteoside did not induce apoptosis in Leydig cells. Together, these results suggest that the acteoside-induced reduction in testosterone production in rat may be at least partially due to down-regulation of cAMP, p450scc, and StAR, but not apoptosis.

Preparation and Catalytic Performance of Amidoximated Polyacrylonitrile Bimodal Nanofiber Iron Complexes

Fu Li,Pengfei Fei,Yongchun Dong,Man Zhang,Yu Feng,Shuqiang Liu,Lu Jia,Hulin Zhang,Zhen Ni 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

To balance the specific surface area and porous structure of nanofibrous heterogeneous Fenton catalyst for therapid transfer of dye molecules during dye-containing wastewater treatment, a polyacrylonitrile nanofiber with bimodaldiameter distribution (n-PAN-D) was prepared and amidoximated, followed by coordinating with Fe3+ ion (Fe-AO-n-PAND). The modification and coordination process hardly changed the fiber morphology and bimodal diameter distribution ofnanofiber membrane. The amidoximated degree of n-PAN-D increased with the increase of the diameter difference, and thecoordination ability of amidoximated n-PAN-D decreased with increasing the diameter difference. Fe-AO-n-PAN-D hadbetter catalytic activity than those with similar thick or thin nanofiber diameters due to the rapid mass transfer of dyemolecules in the catalyst. The possible oxidation and degradation pathway of Reactive Red 195 in the Fe-AO-n-PAN-D/H2O2system was proposed. And the series of reactions may not gradually occur because of the non-selective oxidation of ·OH. Thegood reusability of Fe-AO-n-PAN-D made it potential carrier for heterogeneous Fenton catalyst in wastewater treatment.

Effects of Face Sheet Structure on Mechanical Properties of 3D Integrated Woven Spacer Composites

Man Zhang,Xiaoxue Wang,Shuqiang Liu,Fu Li,Gaihong Wu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7

Due to the lightweight, structural integrity, superior heat and sound insulation performance, three-dimensional(3D) integrated woven spacer composites are expected to be used in many fields such as marine, automotive, electronics, andbuilding industries. This paper reports the effects of face sheet structure on the mechanical properties of 3D integrated wovenspacer composites. Three-point bending, quasi-static compression and low-velocity impact tests were conducted to comparethe mechanical responses of 3D woven spacer composites with plain and complex face sheets. The floating yarn segments incomplex face sheet could efficiently transfer the stress to neighboring areas and lead to a more balanced stress distribution. The existence of floats thus has positive effect on mechanical properties of composites. On the contrary, plain structuresurface was dense and the stress transfer was easily hindered by numerous weaving points, resulting in stress concentrationand ultimate premature failure. As a consequence, for surface-dominated properties such as warp-direction bending andimpact resistance, 3D integrated woven spacer composites with complex surface is better and should be given priority duringindustrial applications. In terms of weft-direction bending property and quasi-static compressive performance, which moredepend on the structure of core piles, show little difference between the composites with different surfaces.

Bavachin Suppresses Alpha-Hemolysin Expression and Protects Mice from Pneumonia Infection by Staphylococcus aureus

( Ye Tao ),( Dazhong Sun ),( Xinran Ren ),( Yicheng Zhao ),( Hengjian Zhang ),( Tao Jiang ),( Jiyu Guan ),( Yong Tang ),( Wu Song ),( Shuqiang Li ),( Li Wang ) 한국미생물생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.10

Staphylococcus aureus (S. aureus) infection causes dramatic harm to human health as well as to livestock development. As an important virulence factor, alpha-hemolysin (hla) is critical in the process of S. aureus infection. In this report, we found that bavachin, a natural flavonoid, not only efficiently inhibited the hemolytic activity of hla, but was also capable of inhibiting it on transcriptional and translational levels. Moreover, further data revealed that bavachin had no neutralizing activity on hla, which did not affect the formation of hla heptamers and exhibited no effects on the hla thermal stability. In vitro assays showed that bavachin was able to reduce the S. aureus-induced damage of A549 cells. Thus, bavachin repressed the lethality of pneumonia infection, lung bacterial load and lung tissue inflammation in mice, providing potent protection to mice models in vivo. Our results indicated that bavachin has the potential for development as a candidate hla inhibitor against S. aureus.