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- 저자 : Dongdong Ye (검색결과 5 건)
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Influence of water-stressed rice on feeding behavior of brown planthopper, Nilaparvata lugens (Stål)
Ye Tan,Mufei Zhu,Wenyan Xu,Wenwu Zhou,Dongdong Lu,Hanwu Shang,Zengrong Zhu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2
Climate change can impact insects through abnormal weather conditions such as elevated temperatures and droughts. Crops experiencing periods of water stress from droughts may have significant effects on pest populations because of physiology changes, insect behavior and adaptation. Herewe report on the effects ofwater stress on the rice pest, the brown planthopper (BPH), Nilaparvata lugens (Stål). In themultiple choice test, both the fifth instar nymphs and female adults BPH preferred plants under the low stress level over control and high stress plants. The electrical penetration graph (EPG) showed that the fifth instar nymphs spent more time in non-penetration activities while the female adults spent less. Both the fifth instar nymphs and female adults spent more time in salivation on high stress plants than in control and low stress plants indicating difficulties in feeding. In addition there was marked increase in probe numbers made by both the fifth instar nymphs and the female adults in the feeding duration. The fifth instar nymphs made twice as many numbers of probes than those in the control (9.36 vs to 5.25 min) while the female adults made about 4 times more probes (13.13 vs 3.00 min). Both the fifth instar nymphs and the female adults producedmore honeydewon the lowstress plants suggesting that plants in low water stress favored insect feeding. These findings indicate that BPH in low water stress rice plants seem to do better which supports the theory that drought induces pest outbreaks.
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The Study of Maximum Power Point Tracking Control for DFIG based on PSCAD
Li, Dongdong,Wang, Lu,Wang, Yun,Wang, Kaikai,Ye, Chensheng The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.3
In recent years, wind power has been developed rapidly. Doubly fed induction generator becomes the main model of wind power become the mainstream due to its high wind energy utilization efficiency and reactive power controllability. On the basis of analyzing the principle and mathematical model of DFIG, dual-loop control system based on the stator flux oriented vector control of DFIG was established, and active and reactive power decoupling control is realized. This paper shows speed control model and power control model which are control modes of the maximum wind power point tracking (MPPT). Simulation results show the control system has good performance and power control mode is more practical and stable than speed control mode.
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Changdong Yin,Dongdong Ye,Zhou Xu,Jianjun Chen,Yiwen Wu,Houli Liu,Xin Ge,Qiang Liu,Guiling Zeng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
Understanding and solving the problem of hydrogen damage due to the degradation of service performance of high-strengthsteel caused by hydrogen penetration is a milestone for the reliability improvement of high-end hydrogen energy equipment. From the perspective of microscopic hydrogen movement behavior, this study investigated the permeability of hydrogenin base metal (BM) and welded metal (WM) of 2.25Cr–1Mo–0.25 V steel welded joint through electrochemical hydrogenpermeation test, and the analytical models of hydrogen penetration and hydrogen diffusion in the welding zone were established,and the effect of adding hydrogen-resistant coatings (HRCs) on hydrogen movement behavior in steel substrate wasstudied. The results showed that the diffusivity of hydrogen in WM of the welded joint was significantly lower than thatin BM, and the hydrogen concentration in BM was higher than that in WM at the beginning of hydrogenation without theaddition of HRCs protection, while it tended to be consistent at the later stage. However, the hydrogen concentration in WMwas lower than that in BM after adding HRCs and would be always higher than that in BM after a certain period of time,and the difference was directly related to the hydrogen resistance of the coatings. Additionally, the difference between theintermediate and outer layers for the welding zone steel substrate with and without HRCs presented a trend of rapid increasefollowed by a slow decrease. These findings could provide an important reference value for hydrogen damage protectionmeasures and related researches on HRCs.
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Kang, Jiawen,Xiong, Zehui,Niyato, Dusit,Ye, Dongdong,Kim, Dong In,Zhao, Jun IEEE 2019 IEEE Transactions on Vehicular Technology VT Vol.68 No.3
<P>In the Internet of Vehicles (IoV), data sharing among vehicles is critical for improving driving safety and enhancing vehicular services. To ensure security and traceability of data sharing, existing studies utilize efficient delegated proof-of-stake consensus scheme as hard security solutions to establish blockchain-enabled IoV (BIoV). However, as the miners are selected from miner candidates by stake-based voting, defending against voting collusion between the candidates and compromised high-stake vehicles becomes challenging. To address the challenge, in this paper, we propose a two-stage soft security enhancement solution: 1) miner selection and 2) block verification. In the first stage, we design a reputation-based voting scheme to ensure secure miner selection. This scheme evaluates candidates’ reputation using both past interactions and recommended opinions from other vehicles. The candidates with high reputation are selected to be active miners and standby miners. In the second stage, to prevent internal collusion among active miners, a newly generated block is further verified and audited by standby miners. To incentivize the participation of the standby miners in block verification, we adopt the contract theory to model the interactions between active miners and standby miners, where block verification security and delay are taken into consideration. Numerical results based on a real-world dataset confirm the security and efficiency of our schemes for data sharing in BIoV.</P>
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Incentivizing Consensus Propagation in Proof-of-Stake Based Consortium Blockchain Networks
Kang, Jiawen,Xiong, Zehui,Niyato, Dusit,Wang, Ping,Ye, Dongdong,Kim, Dong In IEEE 2019 IEEE wireless communications letters Vol.8 No.1
<P>In proof-of-stake based consortium blockchain networks, pre-selected miners compete to solve a crypto-puzzle with a successfully mining probability proportional to the amount of their stakes. When the puzzle is solved, the miners are encouraged to take part in mined block propagation for verification to win a transaction fee from the blockchain user. The mined block should be propagated over wired or wireless networks, and be verified as quickly as possible to decrease consensus propagation delay. In this letter, we study incentivizing the consensus propagation considering the tradeoff between the network delay of block propagation process and offered transaction fee from the blockchain user. A Stackelberg game is then formulated to jointly maximize utility of the blockchain user and individual profit of the miners. The blockchain user acting as the leader sets the transaction fee for block verification. The miners acting as the followers decide on the number of recruited verifiers over wired or wireless networks. We apply the backward induction to analyze the existence and uniqueness of the Stackelberg equilibrium. Performance evaluation validates the feasibility and efficiency of the proposed game model in consensus propagation.</P>
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