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( Feng Zhang ),( Xiaoming Wang ),( Lichen Zhang ),( Peng Li ),( Liang Wang ),( Wangyang Yu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.4
In order to improve the energy efficiency of n-Epidemic routing protocol in opportunistic networks, in which a stable end-to-end forwarding path usually does not exist, a novel adjustment strategy for parameter n is proposed using learning atuomata principle. First, nodes dynamically update the average energy level of current environment while moving around. Second, nodes with lower energy level relative to their neighbors take larger n avoiding energy consumption during message replications and vice versa. Third, nodes will only replicate messages to their neighbors when the number of neighbors reaches or exceeds the threshold n. Thus the number of message transmissions is reduced and energy is conserved accordingly. The simulation results show that, n-Epidemic routing protocol with the proposed adjustment method can efficiently reduce and balance energy consumption. Furthermore, the key metric of delivery ratio is improved compared with the original n-Epidemic routing protocol. Obviously the proposed scheme prolongs the network life time because of the equilibrium of energy consumption among nodes.
A Compact Bandpass Wilkinson Power Divider With Ultra-Wide Band Harmonic Suppression
Wang, Yang,Zhang, Xiao-Yu,Liu, Fu-Xing,Lee, Jong-Chul THE INSTITUTE OF ELECTRICAL ENGINEERS 2017 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS Vol.27 No.10
<P>A Wilkinson power divider (WPD) with bandpass property and an ultra-wide band harmonic suppression is proposed in this letter. The frequency-selecting coupling structure is embedded to the conventional quarter-wavelength transmission line, which can realize an ultra-wide harmonic suppression with three transmission zeros. Short-ended meander line stubs are shunted at the both output ports for dc block and provide an extra transmission zero for the passband. The proposed WPD operates with a -20 dB bandwidth from 1.74 to 3.71 GHz with an ultra-wide stopband to suppress the dc, 3 f(0), 5f(0), and 7 f(0) harmonic components. The proposed WPD has a compact size of 14.65 mm x 19.64 mm (0.19 lambda(g) x 0.25 lambda(g)).</P>
Wang Yang,Liu Xiaohua,Wang Yiming,Jin Mingxia,Xie Guai,Zhong Qiuping,Yu Ailin 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
To explore the molecular mechanism of honeybees (Apis mellifera L.) poisoning death by ingestion of Camellia oleifera nectar, feeding experiments were designed to investigate the poisoning effects. Observed the develop ment process of poisoning symptoms, and collected bees at key experimental nodes for transcriptome sequencing analysis. The results showed that the first poisoning symptom was observed within 0.5 h after ingestion of Camellia oleifera nectar, with death occurring as early as 2 h post-ingestion and all honey bees dying within 4 h. There were four stages in the development of poisoning symptoms: normal flying, crawling (abdominal swelling, inability to fly normally), fluttering (inability to crawl normally), and death. Transcriptome sequencing analyzed the causes of poisoning death indicated that honey bee poisoning occurred with the transduction of dietary restriction signals into cells, resulting in the down-regulated expression gene elements that ensure cell health and inhibit apoptosis, including intracellular NAD+-dependent protein deacetylase sirtuin 1, insulin-like growth factor 1, and heat shock proteins. At the same time, the expression of cysteinyl aspartate specific proteinase 7, which protects programmed cell apoptosis, was also downregulated, resulting in the rapid and disorderly deaths of a large number of cells in individuals in a short period of time, and eventually leading to bees fatality.
Wang Yang,Jin Mingxia,Wang Yiming,Yang Ying,Yu Ailin 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.2
In order to determine whether the pine wood nematode (PWN), Bursaphelenchus xylophilus can be transmitted into the pine twigs through the needles, and to identify the transmission characteristics, inoculation experiments were conducted on intact pine seedlings and detached pine needles. The experimental results indicate that PWNs could infest pine needles through wounds. Resin ducts distributed in the pine needles were the route for PWN movement. The fastest movement speed of PWN through pine needles was 2.0 cm/h, with an average fastest speed of 0.92 cm/h. PWNs could be transmitted into pine twigs within 12 h of being inoculated onto attached pine needles, ultimately leading to fatal pine wilt disease. This is the first report of PWN infestation and the induction of pine wilt disease through pine needles. After PWN infected pine needles, not all of them entered the twigs, with some nematodes colonized in the needles, where they reproduced.