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Data Dissemination in Wireless Sensor Networks with Instantly Decodable Network Coding
Liang Gou,Gengxin Zhang,Dongming Bian,Wei Zhang,Zhidong Xie 한국통신학회 2016 Journal of communications and networks Vol.18 No.5
Wireless sensor networks (WSNs) are widely applied inmonitoring and control of environment parameters. It is sometimesnecessary to disseminate data through wireless links after they aredeployed in order to adjust configuration parameters of sensors ordistribute management commands and queries to sensors. Severalapproaches have been proposed recently for data dissemination inWSNs. However, none of these approaches achieves both high effi-ciency and low complexity simultaneously. To address this problem,cluster-tree based network architecture, which divides aWSN intohierarchies and clusters is proposed. Upon this architecture, datais delivered from base station to all sensors in clusters hierarchyby hierarchy. In each cluster, father broadcasts data to all his chil-dren with instantly decodable network coding (IDNC), and a novelscheme targeting to maximize total transmission gain (MTTG) isproposed. This scheme employs a new packet scheduling algorithmto select IDNC packets, which uses weight status feedback matrix(WSFM) directly. Analysis and simulation results indicate that thetransmission efficiency approximate to the best existing approachmaximum weight clique, but with much lower computational over-head. Hence, the energy efficiency achieves both in data transmis-sion and processing.
Data Dissemination in Wireless Sensor Networks with Instantly Decodable Network Coding
Gou, Liang,Zhang, Gengxin,Bian, Dongming,Zhang, Wei,Xie, Zhidong The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5
Wireless sensor networks (WSNs) are widely applied in monitoring and control of environment parameters. It is sometimes necessary to disseminate data through wireless links after they are deployed in order to adjust configuration parameters of sensors or distribute management commands and queries to sensors. Several approaches have been proposed recently for data dissemination in WSNs. However, none of these approaches achieves both high efficiency and low complexity simultaneously. To address this problem, cluster-tree based network architecture, which divides a WSN into hierarchies and clusters is proposed. Upon this architecture, data is delivered from base station to all sensors in clusters hierarchy by hierarchy. In each cluster, father broadcasts data to all his children with instantly decodable network coding (IDNC), and a novel scheme targeting to maximize total transmission gain (MTTG) is proposed. This scheme employs a new packet scheduling algorithm to select IDNC packets, which uses weight status feedback matrix (WSFM) directly. Analysis and simulation results indicate that the transmission efficiency approximate to the best existing approach maximum weight clique, but with much lower computational overhead. Hence, the energy efficiency achieves both in data transmission and processing.
Mechanical Response of Buried Polyethylene Pipeline Beneath the Roadway and Its Influential Factors
Liang Li,Gou Wen-Jin,Tian Da-Lang,Yu Wen-Da 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.4
In order to investigate the 2D mechanical response of fl exible buried pipeline beneath roadway under static loads, taken high density polyethylene as object, ANSYS fi nite element commercial software is employed to construct pipe-soil interacting coupled model. By means of newly developed model, the infl uence of burial depth, diameter of pipe and modulus of backfilled earth on deformation and mechanical characteristics of pipe is studied. Furthermore the viscoelastic properties of tubular product are considered to simulate creep deformation of pipe under constant loading. These results indicate that: (1) the maximum vertical displacement and Von Mises stress appear at top of pipe and side of internal surface of pipe, respectively; (2) the viscoelastic properties significantly improve the safety of pipe; (3) even if burial depth does not have signifi cant effect on mechanical characteristics of pipe, there is optimal burial depth; (4) the greater the diameter of conduits, the larger modulus backfi lled earth, the more diffi cult it is to destroy pipe breaks.
In-situ dynamic loading test of a hybrid continuous arch bridge
Hongye Gou,Liang Li,Yu Hong,Yi Bao,Qianhui Pu 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.6
In this study, the dynamic behavior of a three-span hybrid continuous arch bridge under vehicle loading is investigated. The natural vibration characteristics of the bridge were analyzed through pulsation test. In the dynamic loading test, the vibrations of the bridge under different truck speeds and different pavement conditions were tested, and time histories of deflection and acceleration of the bridge were measured. Based on the dynamic loading test, the impact coefficient was analyzed. The results indicate that the pavement smoothness had more impacts on the vibration of the bridge than the truck’s speed. The vertical damping of the bridge under the excitation of the trucks is larger than the transverse damping. Resonance occurs at the side span of the bridge under a truck at 10 km/h.
A Hierarchical Autonomous System Based Topology Control Algorithm in Space Information Network
( Wei Zhang ),( Gengxin Zhang ),( Liang Gou ),( Bo Kong ),( Dongming Bian ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.9
This article investigates the topology control problem in the space information network (SIN) using a hierarchical autonomous system (AS) approach. We propose an AS network topology control (AS-TC) algorithm to minimize the time delay in the SIN. Compared with most existing approaches for SIN where either the purely centralized or the purely distributed control method is adopted, the proposed algorithm is a hybrid control method. In order to reduce the cost of control, the control message exchange is constrained among neighboring sub-AS networks. We prove that the proposed algorithm achieve logical k-connectivity on the condition that the original physical topology is k-connectivity. Simulation results validate the theoretic analysis and effectiveness of the AS-TC algorithm.
Accelerated Life Test Study on Thyristors of HVDC Converter Valve
Cuicui Liu,Ning Liang,Yating Gou,Jiachen Tian,Fang Zhuo,Feng Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
As the key component of HVDC converter valve system, thyristors have vital impact on the reliability of the entire HVDC transmission project. In order to effectively obtain the life model of thyristor, this paper uses the existing accelerated life test theory, combined with the operating conditions of the converter valve and the relevant characteristics of the thyristors, to deeply analyse the several stress levels that have the most serious impact on the life of the thyristors. An accelerated life test scheme that can effectively guide the life model of the thyristor, according to the test data collected by this test method, the thyristor junction temperature life model under the short-circuit current stress is established, and compared with the thyristor failure rate in the practical engineering, the results show the feasibility of the test scheme and the correctness of the life model.
An Asynchronous Burst Time Plan Generation Method for Broadband Satellite Multimedia System
( Shaodong Feng ),( Fan Wang ),( Yuan Lin ),( Liang Gou ),( Guangxia Li ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.2
In broadband satellite multimedia (BSM) system, burst time plan (BTP) is always periodically generated. We find that this method can have a great effect on the system response ability to bandwidth requests. A general analysis model of BTP generation method is given. An optimized BTP generation (O-BTPG) method is presented by deducing the optimal bandwidth allocation period (BAP) and bandwidth allocation latency (BAL) without considering the signaling overhead caused by BTP. Then a novel asynchronous BTP generation (A-BTPG) method in which the BTP is generated asynchronously according to the traffic load from users` bandwidth requests is proposed. Simulation results show that A-BTPG can flexibly realize a trade-off between the system response ability and BTP signaling overhead. What`s more, it can be widely used in various regenerative onboard switching BSM systems
Xiaojuan Feng,Yanlong Shi,Jingmei Liang,Wei Li,Xuyuan Gou 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Exploring high activity, stable and low-cost electrocatalysts are of great importance for high-efficienthydrogen production via water splitting. Herein, a cactus-like Fe, P co-doped CoNi-S arraywas constructedvia facile hydrothermal reaction and subsequently sulfuration and phosphorization process. Benefitingfrom the strong synergistic effects of different components, high conductivity of bimetallic sulfide, 3Dcactus-like architecture with rich channels for mass/charge transport, and Fe and P co-doping with electronstructure regulation, the as-prepared Fe, P-NiCo2S4/NF presents superior electrocatalytic activity withlow overpotentials of 139 and 290 mV to drive the current density of 10 and 40 mA cm2 for HER and OER,respectively. Meanwhile, it also manifests the distinguished durability for over 60 h in alkaline media. Notably, when integrating in a two-electrode electrolytic cell with Fe, P-CoNi-S, a reduced operation voltageof 1.55 V is required to reach 10 mA cm2, which is superior to precious metal-based Pt/C/NF//RuO2/NFcounterparts. Impressively, it can also be driven by sustainable solar and thermal energies motivatedStirling engine. This work offers a universal strategy for designing high-activity and durable electrocatalystsby dual doping heteroatoms and synergistic interface engineering.
HOCl Oxidation-modified CT26 Cell Vaccine Inhibits Colon Tumor Growth in a Mouse Model
Zhou, Rui,Huang, Wen-Jun,Ma, Cong,Zhou, Yan,Yao, Yu-Qin,Wang, Yu-Xi,Gou, Lan-Tu,Yi, Chen,Yang, Jin-Liang Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8
Despite progress in elucidating mechanisms associated with colorectal cancer and improvement of treatment methods, it remains a frequent cause of death worldwide. New and more effective therapies are therefore urgently needed. Recent studies have shown that immunogenicity of whole ovarian tumor cells and subsequent T cell response were potentiated by oxidation modification with hypochlorous acid (HOCl) in vitro and ex vivo. These results prompted us to investigate the protective antitumor response with an HOCl treated CT26 colorectal cancer cell vaccine in an in vivo mouse model. Administration of HOCl modified vaccine triggered robust antitumor immunity to autologous tumor cells in mice and prolonged survival period significantly. In addition, increased necrosis and apoptosis were found in tumor tissue from the oxidation group. Interestingly, ELISPOT assays showed that specific T cell responses were not elicited in response to the immunizing cellular antigen, in contrast to raising sera antibody titer and antibody binding activity shown by ELISA assay and flow cytometry. Further evaluation of the mechanisms underlying HOCl modified vaccine mediated humoral immunity highlighted the role of antibody-dependent cell-mediated cytotoxicity. These results combined with previous studies suggest that HOCl oxidation modified whole cell vaccine has wide applicability as a cancer vaccine because it can target both T cell- and B cell-specific responses. It may thus represent a promising approach for the immunotherapy of colorectal cancer.