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Consensus-Based Finite-Time Cooperative Guidance with Field-of-View Constraint
Shuai Ma,Xugang Wang,Zhongyuan Wang,Qi Chen 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.5
The problem of cooperative guidance of multiple missiles with field-of-view constraint is addressed based on consensus theory. Considering the singularity problem when the second-order consensus algorithm is directly applied to missile guidance, a novel finite-time consensus algorithm with field-of-view constraint is derived and proved. The singularity problem is also avoided. Cooperative guidance law under 2D and 3D engagement is designed using a two-stage guidance scheme. In the first stage, a decentralized guidance law is designed based on the derived finite-time consensus algorithm to provide the latter stage’s desired initial conditions, and proportional navigation guidance law is used in the second stage. The proposed cooperative guidance law requires neither time-to-go estimation nor controllable velocity magnitude. Compared with other two-stage guidance schemes, the proposed cooperative guidance law can provide better initial conditions for the second stage. Numerical simulation and comparison work demonstrate the effectiveness and superiority of the proposed cooperative guidance law.
Yongdi Ma,Xi Chen,Shuai Wang,Hualin Dong,Xiaoying Zhai,Xin Shi,Jianzu Wang,Rujiang Ma,Wangqing Zhang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
PVDF membrane has strong hydrophobicity and low anti-pollution performance, greatly limiting its practicalapplication. These drawbacks have been successfully overcome by designing and then preparing amembrane with a semi-interpenetrating polymer (semi-IPN) of PVDF/poly(acrylic acid) (PAA) as themembrane matrix, TiO2 nanoparticles as functional components and F127 as pore-forming agent. Thesemi-IPN was prepared by copolymerizing acrylic acid with N,N methyl acrylamide in the presence ofPVDF, and the TiO2 gel nanoparticles were in situ formed in the membrane-forming process. The propertiesof the composite membrane were significantly affected by the semi-IPN, F127 and TiO2. By adjustingthe membrane structure with the semi-IPN, F127 and TiO2 nanoparticles, we prepared a composite membranewith a water contact angle of 40, a BSA rejection ratio of 87.5% and a water flux of 802.5 L/m2/h/bar. After a simple UV irradiation, the water flux of this composite membrane rose to 1030 L/m2/h/bar,without any rejection decline. The membrane contaminated by humic acid could recover the water fluxup to above 95.3% of its original value by a single UV irradiation, showing a very good antifouling performance. In addition, the composite membrane also exhibited a very strong pollution resistance and separationperformance for bovine serum albumin and oil-water emulsion. All in all, based on the synergy ofthe semi-IPN and the evenly dispersed TiO2 nanoparticles, the prepared composite membrane exhibitedexcellent comprehensive properties and demonstrated a great potential for various separationapplications.
Ma, Dongli,Zhu, Tao,Yang, Fengjuan,Zhang, Shuai,Huang, Chengfei Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.9
Objective: This research was carried out to investigate the effects of corn particle size on the apparent total tract digestibility (ATTD) of energy and nutrients fed to pigs at four different growth stages and therefore to provide basis for better application of corn in pig feeds. Methods: Eighteen weanling piglets, 18 growing barrows, 24 gestating sows and 24 lactating sows were used in this study. Within each stage, pigs were allotted to 1 of 3 or 4 corn-soybean meal diets which were formulated with different corn particle size in a completely randomized design with 6 replicate pigs per diet. Each stage lasted for 19 days, including 7 days for cages adaptation, 7 days for adaptation to diets and followed by 5 days for total collection of feces and urine. Results: For nursery and growing stages, the results showed that digestible energy content and ATTD of gross energy (GE), dry matter (DM), neutral detergent fiber (NDF), and acid detergent fiber (ADF) was increased (p<0.05) as the corn particle size reduced. Meanwhile, the metabolizable energy content and ATTD of crude protein (CP) tended to increase. For gestating sows, no differences were found in the ATTD of nutrients among dietary treatments. As for lactating sows, there were linear and quadratic increases (p<0.05) in the ATTD of DM, GE, NDF as the corn being finer milled. Quadratic response in ATTD of ADF and CP (p<0.05) were observed as sows fed with four different diets. Conclusion: Reducing corn particle size can increase digestibility of nutrients fed to young pigs and lactating sows. No effects were observed in present experiment when gestating sows were fed with different particle sized corn.
Shuai Chen,Jun Guo,Lifeng Ma 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7
In this paper, the network-based sliding mode observer is investigated for a class of discrete nonlineartime-delay systems with stochastic communication protocol. The stochastic communication protocol is adopted toregulate the transmission order of the measurements from multiple sensor nodes, which could effectively avoid datacollisions. Under the scheduling of communication protocol, only one sensor node is allowed to get access to theshared communication network at each time step for data transmission. Moreover, the stochastic communicationprotocol is governed by a Markov chain, which converts the protocol-constrained system into a Markovian jumpsystem. It is the purpose to design a sliding mode observer such that, with the stochastic communication protocol,the trajectories of the estimation error system are driven into a band of the sliding surface and, in subsequent time,the sliding motion is mean-square asymptotically stable. By solving a minimization problem, the sufficient conditions for the desired sliding mode observer are established. Finally, an illustrative example is given to demonstratethe effectiveness of the proposed algorithm.
Shuai Huang,Huiling Ma,Bi Gong,Fujuan Wei 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.2
We evaluated and optimized the effects of an alternative pre-harvest application of the non-toxic ethyleneaction inhibitor 1-methylcyclopropene (1-MCP)on the physiology and storage life of the cut rose (Rosa hybrida) cv. Carola. Cut rose was treated with a single pre-harvest liquid formula spray of 10 μL·L-11-MCP or a single treatmentof a modified atmosphere packaging of 50-μm thick polyethylene film (PE50), or a combination of the two (1-MCP+PE50),and the effects on vase life, storage life, and cold storage senescence related physiological changes were evaluated. Cut rose subjected to the pre-harvest 1-MCP spray treatment had the longest storage life (26 days), while those subjectedto PE50, 1-MCP+PE50, and the untreated control treatment had mean storage lives of 22, 19, and 16 days, respectively. Additionally, the pre-harvest 1-MCP spray treatment significantly extended the vase life of cold-stored flowers forzero or six days, by 27.08% and 42.55%, respectively. The pre-harvest spray treatment significantly suppressed respirationintensity, ethylene production, soluble protein degradation, 1-aminocyclopropane-1-carboxylic acid (ACC) production,and ACC oxidase activity. The 1-MCP+PE50 treatment compromised all the effects of the 1-MCP treatment exceptthe effect on soluble protein content. We conclude that a pre-harvest 1-MCP spray treatment has positive effects onthe vase life and storage longevity of cut rose, and that combining this treatment with a PE50 package diminishesthese effects.
Remote control system based on the internet and machine vision for tracked vehicles
Shuai Wang,Shubing Zhang,Ruoding Ma,E. Jin,Xinhui Liu,He Tian,Ruipeng Yang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3
A remote control system based on the Internet and machine vision is designed in this study for tracked vehicles. The system consists of remote monitoring, remote control, and visual navigation subsystems. The on-board computer receives control commands issued by the monitoring center and controls the speed and steering angle of the tracked vehicles. The front camera collects navigation line information, and the collected image is processed by filtering, gray processing, binarization processing, and interference elimination to obtain the center point coordinates of the navigation line. Proportional-integral-derivative (PID), fuzzy PID, and neural network control algorithms are compared based on the distance and angle deviations of the preview point to control the operation of tracked vehicles through simulation. The Internet remote control system with the fuzzy PID control algorithm is then tested on a tracked vehicle. Experimental results indicate that the trajectory of the tracked vehicle fits the navigation path well.
Yi-Shuai Ren,Yong Jiang,Chao-Qun Ma,Olaf Weber 한국증권학회 2021 Asia-Pacific Journal of Financial Studies Vol.50 No.5
This paper applies a modified structural vector autoregressive (SVAR) model to explore whether explicit structural oil price shocks affect investor sentiment in China’s stock market. The results indicate that China’s investor sentiment responds significantly positively to OPEC supply shocks, while it responds significantly negatively to oil-specific demand shocks. However, China’s stock investor sentiment does not respond to aggregate demand shocks and non-OPEC supply shocks. In addition, OPEC supply shocks and oil-specific demand shocks have greater explanatory power for variations in stock investor sentiment through variance decomposition.