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ShuYu Chen,GuiPing Wang,Jun Liu,MingWei Lin 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.1
In order to successfully monitor a large-scale distributed system, it is an important issue that the monitoring function fully covers all the entities in the system. To this end, a key challenge is to efficiently transmit state information of the entities in the system. This paper solves this challenge from two aspects. First, in virtue of the idea of self-organizing networks, this paper proposes a neighborhood organization algorithm, which self-organizes the nodes into several monitoring neighborhoods based on the t distance between nodes. The second aspect focuses on message transmission. There are three common message transmission methods in network, i.e., flooding, multicast and unicast. Flooding may cause high network overhead, while unicast may pose high system delay. Based on the idea of Gossip protocol, this paper proposes a directional message dissemination algorithm (D-Gossip), which is a kind of probabilistic multicast. D-Gossip reduces message dissemination uncertainty of traditional Gossip protocols. It effectively improves the efficiency and coverage of message dissemination, while reducing redundant information in the system due to Gossip protocol. The experimental results show that the neighborhood organization algorithm and the D-Gossip can effectively solve the above challenge.
Quantitative Analysis of Critical Limitation in Using Extended State Observer
Mingwei Sun,Yi Li,Zenghui Wang,Zengqiang Chen 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
Active disturbance rejection control (ADRC) has been successfully widely applied. The extended stateobserver (ESO) is a crucial component of ADRC to deal with uncertainties in many control systems. Althoughthe nominal stability of ADRC was proved by adopting a sufficiently fast observer with a performance recoveryprinciple, it is difficult to be employed in practice because severe oscillation or even instability might be triggeredif the fast observer was used. This paper investigates the reason behind this phenomenon within the frameworkof input time-delay sensitivity for a typical first-order system, which can provide an insightful understanding ofADRC. The positive root of the polynomial which determines the maximal input time-delay maintaining closed loopstability is quantitatively analyzed and the relationship among the bandwidth of ESO, other control parametersand the allowable input time-delay is thoroughly studied. Finally, numerical examples are presented to validate thecorresponding theoretical results.
Transcript Profiling of Toll-Like Receptor mRNAs in Selected Tissues of Mink (Neovison vison)
( Mingwei Tong ),( Li Yi ),( Yuening Cheng ),( Miao Zhang ),( Zhigang Cao ),( Jianke Wang ),( Hang Zhao ),( Peng Lin ),( Yong Yang ),( Shipeng Cheng ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.12
Toll-like receptors (TLRs) can recognize conserved molecular patterns and initiate a wide range of innate and adaptive immune responses against invading infectious agents. The aim of this study was to assess the transcript profile of mink TLRs (mTLRs) in mink peripheral blood mononuclear cells (PBMCs) and a range of tissues, and to explore the potential role of mTLRs in the antiviral immune response process. The results indicated that the mTLR partial nucleotide sequences had a high degree of nucleotide identity with ferret sequences (95-98%). Phylogenetic analysis showed that mammalian TLRs grouped into five TLR families, with a closer relationship of the mTLRs with those of ferret than the other mammalian sequences. Moreover, all the mTLRs were ubiquitously expressed in lymphoid organs (spleen and lymph nodes) and PBMCs. Interestingly, the mTLR expression patterns in lung, uterus, and heart showed quite a lot of similarity. Another remarkable observation was the wide expression of mTLR1-3 mRNAs in all tissues. Among the analyzed tissues, skeletal muscle was revealed to being the lowest repertoire of mTLR expression. Additionally, mink PBMCs exposed to the canine distemper virus revealed significant upregulation of mTLR2, mTLR4, mTLR7, and mTLR8 mRNAs, indicating that mTLRs have a role in innate immunity in the mink. Collectively, our results are the first to establish the basic expression patterns of mTLRs and the relationship between mTLRs and a virus, which will contribute to better understanding of the evolution and the functions of mTLRs in the innate immune system in minks.
The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser
Ma Yue,Wang Mingwei,Yang Fanlin,Li Song 한국광학회 2015 Current Optics and Photonics Vol.19 No.4
The current waveform model of a laser altimeter is based on a Gaussian laser beam of fundamentalmode, while the flattened Gaussian beam has many advantages such as nearly constant energy distributionon the center of the cross-section. Following the theory of the flattened Gaussian beam and the waveformtheory of the laser altimeter, some of the primary parameters of the received waveform were derived, anda laser altimetry waveform simulator and waveform processing software were programmed and improvedunder the circumstance of a flattened Gaussian beam. The result showed that the bias between theoreticaland simulated waveforms was less than 3% for every order mode, the waveform width and range errorwould increase as target slope or order number rose. Under higher order mode, the shapes of the receivedwaveforms were no longer Gaussian, and could be fitted more precisely as a generalized Gaussian functionwith power bigger than 2. The flattened beam got much better performance for a multi-surface target,especially when the small surface is far from the center of the laser footprint. This article provides thewaveform theoretical basis for the use of a flattened Gaussian beam in a laser altimeter
Porous Nano-Ni/Graphene/Loofah Composites for Electromagnetic Interference Shielding
Yi Jiang,Mingwei Liang,Weijing Wang,Xuefei Lai,Kenan Xie,Li Liao,Qin Long 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
The urgent requirement of materials with superior electromagnetic shielding properties has been aroused for alleviating electromagnetic pollution. Now, some natural materials such as silkworm cocoon, walnut shell, and so on are gradually used to prepare the electromagnetic interference shielding composites. However, loofah sponges with unique and inherent 3D hierarchical porous structure, which could be obtained from food waste and the wilted loofah, are ignored. In this work, loofah sponges were modified by NaOH and H2 O2 . Then the carbonized modified Loofah/Ni nanoparticles/Graphene composites were prepared by immersion and thermal reduction. Meanwhile, the composites had inherited advantages from natural materials such as low density, porous structure and eco-friendly. As the result of loading of Ni nanoparticles and graphene on the loofah, the outstanding performance was achieved that the shielding effectiveness was raised to 57 dB, and the specific shielding effectiveness was raised to 616.8 dB cm 3 /g. This result demonstrated that composites materials based on natural loofah sponges show tremendous potential for electromagnetic shielding.
Yunxi Zhang,Yu Fan,Mingwei Sun,Zenghui Wang,Zengqiang Chen 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.1
The high-speed anti-ship missile might encounter a challenge in the terminal phase if there are mixed targets, including false and true ones. There is only a quite short time to take action after the onboard radar can distinguish which targets are true or false. In this study, a tunable acceleration feedback gain is used to realize a unique integrated guidance and control scheme in a natural way by maintaining advantages of the traditionally practical proportional navigation and three-loop acceleration autopilot without introducing additional dynamics as the existing methods in the literature. The gain range can be determined using a numerical calculation scheme. The adjoint method is employed to reveal the advantage of the tunable gain and can then obtain the optimal gain. The proposed method can achieve a trade-off between the effective navigation gain and the settling time of the autopilot during the integration. Extensive simulations are performed to validate the appealing discovery. This philosophy offers guideline for the renovation of existing anti-ship missiles.