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| 1 | A resilient trust management scheme for defending against reputation time-varying attacks based on BETA distribution显示文摘Compared with the encryption and the authentication which can prevent the external attacks,the trust management schemes are the better approaches for defending against the internal attacks in wireless sensor network(WSN). The reputation time-varying(RTV) attacks are internal attacks. In the reputation timevarying attacks, the reputation value of nodes is manipulated to adjust dynamically by the compromised nodes or malicious attackers. Hence, these attacks have greater covert and invasive. In this paper, we propose a Timewindow-based Resilient Trust Management Scheme(TRTMS) to defend against the reputation time-varying attacks in wireless sensor network. In this scheme, based on BETA distribution, the behaviors of compromised nodes are analyzed for a period of time, and then the difference judgment and the trend analysis are utilized to identify the abnormality of nodes' reputation value, meanwhile, the control factor Fc and the time window are introduced to verify and remove the compromised modes from the suspected malicious nodes, which refer to those nodes' reputation value changes are caused by the wireless channel changes. The result of simulation shows that our proposed scheme can defend reputation time-varying attacks effectively and it is convenient to implement. | Weidong FANG Wuxiong ZHANG Yang YANG Yang LIU Wei CHEN | 2017 | Science China(Information Sciences)2017，60，4： | 5 |
| 2 | Microstructure and Mechanical Properties of Galvanized Steel/AA6061 Joints by Laser Fusion Brazing Welding显示文摘Laser fusion brazing welding was proposed.Galvanized steel/AA6061 lapped joint was obtained by laser fusion brazing welding technique using the laser-induced aluminium molten pool spreading and wetting the solid steel surface.Wide joint interface was formed using the rectangular laser beam coupled with the synchronous powder feeding.The result showed that the tiny structure with the composition of a-Al and Al–Si eutectic was formed in the weld close to the Al side.And close to the steel side,a layer of compact Fe–Al–Si intermetallics,including the Al-rich FeAl3,Fe2Al5 phases and Al–Fe–Si s1 phase,was generated with the thickness of about 10–20 lm.Transverse tensile shows the brittlefractured characteristic along to the seam/steel interface with the maximum yield strength of 152.5 MPa due to the existence of hardening phases s1 and Al–Fe intermetallics. | Junxia L Wuxiong Yang Shikai Wu Xudong Zhao Rongshi Xiao | 2014 | Acta Metallurgica Sinica(English Letters)2014，27，4： | 3 |
| 3 | Neighbor-Aware Multiple Access Protocol for 5G m MTC Applications显示文摘In order to support massive Machine Type Communication(mMTC) applications in future Fifth Generation(5G) systems,a key technical challenge is to design a highly effective multiple access protocol for massive connection requests and huge traffic load from all kinds of smart devices,e.g.bike,watch,phone,ring,glasses,shoes,etc..To solve this hard problem in distributed scenarios with massive competing devices,this paper proposes and evaluates a Neighbor-Aware Multiple Access(NAMA) protocol,which is scalable and adaptive to different connectivity size and traffic load.By exploiting acknowledgement signals broadcasted from the neighboring devices with successful packet transmissions,NAMA is able to turn itself from a contention-based random access protocol to become a contention-free deterministic access protocol with particular transmission schedules for all neighboring devices after a short transition period.The performance of NAMA is fully evaluated from random state to deterministic state through extensive computer simulations under different network sizes and Contention Window(CW)settings.Compared with traditional IEEE802.11 Distributed Coordination Function(DCF),for a crowded network with 50 devices,NAMA can greatly improve system throughput and energy efficiency by more than 110%and210%,respectively,while reducing average access delay by 53%in the deterministic state. | Yang Yang Guannan Song Wuxiong Zhang Xiaohu Ge Chengxiang Wang | 2016 | China Communications2016，13，S2： | 2 |
| 4 | ACK-based adaptive backoff for random access protocols显示文摘In contention-based networks, ALOHA and CSMA are the most popular random access protocols,wherein a station transmits packets after a certain delay according to a particular backoff policy, such as binary exponential backoff(BEB). When a contention-based network is heavily loaded, system performance, in terms of transmission success rate and throughput, degrades dramatically under random backoff policies without considering the backoff choices of the neighborhood. To alleviate this problem, we propose and verify in this paper a highly efficient backoff policy, namely 'ACK-based adaptive backoff '(AAB), which takes into account the total number of successful packet transmissions(with ACKs) among neighboring stations in determining a station's subsequent backoff period before its next packet(re)transmission. By doing this, AAB can effectively reduce the overall packet collisions under heavy-loaded conditions, even with hidden-stations. On comparing with BEB and its modified policy, multiple increase linear decrease(MILD), AAB can achieve about 17% and10% performance gains of transmission success rate under CSMA protocol in a network with 20 stations with new packet arrival rate of 0.9, and 43% and 16% performance gains of energy efficiency respectively when the former two protocols reach their saturated points. | YANG Yang SONG GuanNan WEI Kun ZHANG WuXiong YOU XiaoHu | 2015 | Science China(Information Sciences)2015，58，4： | 2 |
| 5 | Nd : YAG laser welding of 1420 aluminum-lithium alloy显示文摘 | Xiao Rongshi Yang Wuxiong Chen Kai | 2007 | Chinese J Lasers2007，34，1： | 1 |
| 6 | Multi-hop conneetivity probability in infrastructure-based vehicular networks 显示文摘 | Zhang Wuxiong Chen Yu Yar~g Yang | 2012 | IEEE Journal on Selected Areas in Communications2012，30，4： | 1 |
| 7 | Cooperative wireless networks for better green services显示文摘In order to guarantee the overall return on investment (ROI), improve user experience and quality of service (QoS), save energy, reduce electra magnetic interference (EMI) and radiation pollution, and enable the sustainable deployment of new profitable applications and services in heterogeneous wireless networks coexistence reality, this paper proposes a cross-network cooperation mechanism to effectively share network resources and infrastructures, and then adaptively control and match multi-network energy distribution characteristics according to actual user/service requirements in different geographic areas. Some idle or lightly-loaded base stations (BS or BSs) will be temporally turned off for saving energy and reducing EMI. Initial simulation results show that the proposed approach can significantly improve the overall energy efficiency and QoS performance across multiple cooperative wireless networks. | Yang Yang Zhang Wuxiong Hu Honglin Zhang Sihai Wang Xin Zhao Haitao Zhou Wuyang Wei Jibo | 2011 | Engineering Sciences2011，9，1： | 1 |
| 8 | Channel measurement and modeling for the 15-GHz radio band in an indoor corridor environment显示文摘Traditional mobile communication systems mainly work on the licensed frequency band near or below 3 GHz;however,this band is becoming increasingly crowded.On the other hand,there are abundant unlicensed spectrum resources in higher frequency bands,e.g.,6 GHz,15 GHz,and 28 GHz,and if those bands are applied,the current spectrum shortage problem could be effectively alleviated.However,the wireless channel characteristics and models are important but still unknown,and thus in this study,extensive measurements and modeling have been conducted to study the characteristics of the high-frequency 15-GHz band.Specifically,a PN(Pseudo Noise)sequence based time-domain measurement system was built and applied to measure the propagation characteristics of the LOS(Line-of-Sight)and NLOS(Non-Line-of-Sight)scenarios in an indoor corridor at 15 GHz.Then,in-depth analysis and modeling on the large-scale characteristics of wireless channels,the relationship between distance and path loss,the path loss exponent,and the shadow fading standard variance are provided.Moreover,the relationship between received power and different elevation angles was studied.In the measurement,two 25-dBi horn antennas with a 10 half-power beam width are used to change elevation angles in the transmitting terminal and azimuth angles in the receiving terminal for all measurement points.The findings and results in this work will serve as a reference and basis for future theoretical studies of the 15-GHz band. | XU Hui ZHANG Wuxiong YANG Yang | 2016 | Journal of Communications and Information Networks2016，1，2： | 0 |
| 9 | Trust management-based and energy efficient hierarchical routing protocol in wireless sensor networks显示文摘The single planar routing protocol has a slow convergence rate in the large-scale Wireless Sensor Network(WSN).Although the hierarchical routing protocol can effectively cope with large-scale application scenarios,how to elect a secure cluster head and balance the network load becomes an enormous challenge.In this paper,a Trust Management-based and Low Energy Adaptive Clustering Hierarchy protocol(LEACH-TM)is proposed.In LEACH-TM,by using the number of dynamic decision cluster head nodes,residual energy and density of neighbor nodes,the size of the cluster can be better constrained to improve energy efficiency,and avoid excessive energy consumption of a node.Simultaneously,the trust management scheme is introduced into LEACH-TM to defend against internal attacks.The simulation results show that,compared with LEACH-SWDN protocol and LEACH protocol,LEACH-TM outperforms in prolonging the network lifetime and balancing the energy consumption,and can effectively mitigate the influence of malicious nodes on cluster head selection,which can greatiy guarantee the security of the overall network. | Weidong Fang Wuxiong Zhang Wei Yang Zhannan Li Weiwei Gao Yinxuan Yang | 2021 | Digital Communications and Networks2021，7，4： | 0 |
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