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DQN-based decentralized multi-agent JSAP resource allocation for UAV swarm communication

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Journal of Systems Engineering and Electronics 2023年第2期34卷 289-298页

作者： LI Jie DANG Xiaoyu LI sai College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

It is essential to maximize capacity while satisfying the transmission time delay of unmanned aerial vehicle(UAV)swarm communication *** order to address this challenge,a dynamic decentralized optimization mechanism is presented for the realization of joint spectrum and power(JSAP)resource allocation based on deep Q-learning networks(DQNs).Each UAV to UAV(U2U)link is regarded as an agent that is capable of identifying the optimal spectrum and power to communicate with one *** convolutional neural network,target network,and experience replay are adopted while *** findings of the simulation indicate that the proposed method has the potential to improve both communication capacity and probability of successful data transmission when compared with random centralized assignment and multichannel access methods.

关键词： joint spectrum and power(JSAP) unmanned aerial vehicle(UAV)swarm communication deep Q-learning network(DQN) UAV to UAV(U2U)

Slope Stability Analyses of Outang Landslide Based on the Peak and Residual Shear Strength Behavior

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工程科学与技术 2019年第4期51卷 55-68页

作者： YANG Xiuhan VANAPALLI sai Dept.of Civil Eng. Univ.of Ottawa

Most of the natural and compacted fine-grained soil slopes that are in saturated or unsaturated condition undergo a large deformation prior to reaching failure *** slopes should be designed taking account of their strain-softening behavior using the residual shear strength (RSS) *** this paper,the slope stability of a recently reactivated Outang landslide near the Three Gorges Dam in China is analyzed based on the RSS parameters of unsaturated *** addition,comparisons are provided in the FOS values of slope using both the peak shear strength (PSS) and RSS ***,a series of site investigations of the hydrologic and geologic conditions,ground surface displacements and cracks were *** PSS and RSS behaviors of the sliding soils derived from a series of direct shear test results performed on saturated and unsaturated soil specimens are ***,a series of slope stability analysis were conducted considering the precipitation and Yangtze River water level variation within a representative period of 7 months,based on the PSS and the RSS *** this study,three different scenarios were considered,which include: i) considering only the precipitation with a constant water level;ii) considering only the decrease in water level without rainfall;iii) considering the combination of precipitation and decrease in water *** each scenario,four steps were included to calculate the values of factor of safety (FOS) at different times.1) A steady-state seepage analysis was conducted with a constant total head at 525 m on the left boundary and 175 m on the slope surface below the Yangtze River water *** initial pore water pressures were simulated in the slope under no precipitation and variation of water level.2) A specific boundary condition was applied on the slope surface to model the precipitation and Yangtze River water level variation.A transient seepage analysis was conducted to calculate pore water pres

关键词： unsaturated soil landslide reactivation residual shear strength slope stability analysis

Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 224-239页

作者： sai Guo Guanhui Ren Bi Zhang Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhenGuangdongChina State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityKowloonHong KongChina

New materials and manufacturing technologies require applicable non-destructive techniques for quality assurance so as to achieve better *** study comprehensively investigated the effect of influencing factors includ-ing excitation frequency,lift-off distance,defect depth and size,residual heat,and surface roughness on the defect EC signals of an Inconel 738LC alloy produced by selective laser melting(SLM).The experimental investigations recorded the impedance amplitude and phase angle of EC signals for each defect to explore the feasibility of detecting sub-surface defects by merely analyzing these two key ***,this study revealed preliminary qualitative and roughly quantitative relationships between influencing factors and corresponding EC signals,which provided a prac-tical reference on how to quantitively inspect subsurface defects using eddy current testing(ECT)on SLMed parts,and also made solid progress toward on-line ECT in additive/subtractive hybrid manufacturing(ASHM)for fabricating SLMed parts with enhanced quality and better performance.

关键词： Eddy current testing Subsurface defect Additive/subtractive hybrid manufacturing Selective laser melting Inconel 738LC alloy

Dynamic Deep Learning for Enhanced Reliability in Wireless Sensor Networks: The DTLR-Net Approach

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Computers, Materials & Continua 2024年第11期81卷 2547-2569页

作者： Gajjala Savithri NRaghavendra sai Department of Computer Science and Engineering Koneru Lakshmaiah Education FoundationVaddeswaramAndhra Pradesh522502India Department of Animation Dr.YSR Architecture and Fine Arts UniversityKadapaAndhra Pradesh516162India

In the world of wireless sensor networks(WSNs),optimizing performance and extending network lifetime are critical *** this paper,we propose a new model called DTLR-Net(Deep Temporal LSTM Regression Network)that employs long-short-term memory and is effective for long-term *** sinks can move in arbitrary patterns,so the model employs long short-term memory(LSTM)networks to handle such *** parameters were initialized iteratively,and each node updated its position,mobility level,and other important metrics at each turn,with key measurements including active or inactive node ratio,energy consumption per cycle,received packets for each node,contact time,and interconnect time between nodes,among *** metrics aid in determining whether the model can remain stable under a variety of ***,in addition to focusing on stability and security,these measurements assist us in predicting future node behaviors as well as how the network *** results show that the proposed model outperformed all other models by achieving a lifetime of 493.5 s for a 400-node WSN that persisted through 750 rounds,whereas other models could not reach this value and were significantly *** research has many implications,and one way to improve network performance dependability and sustainability is to incorporate deep learning approaches into WSN dynamics.

关键词： WSN lifetime nodes mobile sinks energy packets security

Coordination game model of co-opetition relationship on cluster supply chains

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Journal of Systems Engineering and Electronics 2008年第3期19卷 499-506页

作者： Zhou Min Deng Feiqi Wu sai Inst. of Systems Engineering South China Univ. of Technology Guangzhou 510640 P. R. China School of Economic Management Guangdong Univ. of Technology Guangzhou 510520 P. R. China

The research of cluster supply chains is a new direction and a hotspot of the industrial cluster theory. On the condition of the coordination game, the enterprises may be stuck on the non-efficient equilibrium status, which becomes an important problem that must be considered on cluster supply chains. A symmetrical coordination game model is constituted to describe the competition and cooperation relationship of the same-quality manufacturers on cluster supply chains. The methods of the non-cooperation game theory and the evolutionary game theory are respectively used to analyze the model, whose parameters＇ influences under each method are then compared. It can be concluded that the analysis of the evolutionary game theory is more realistic and practical. Finally, three approaches are considered to break away from being path-dependence locked-in non-efficient status during this coordination game evolutionary process, which provide the development of cluster supply chains with an effective forecasting and Pareto optimizing method.

关键词： cluster supply chains coordination game non-cooperation game theory evolutionary game theory,path-dependence.

Exotic structures arising from fake projective planes

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Science China Mathematics 2013年第1期56卷 43-54页

作者： YEUNG sai-Kee Department of Mathematics Purdue University

We present examples of exotic structures on pPC2#qPC2 for some small p and q obtained naturally from quotients of fake projective planes in complex geometry,which are classified by the work of Prasad-Yeung and Cartwri... 详细信息

关键词： exotic four-folds fake projective planes

Species-dependent effects of the phenolic herbicide ioxynil with potential thyroid hormone disrupting activity: modulation of its cellular uptake and activity by interaction with serum thyroid hormone-binding proteins

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Journal of Environmental Sciences 2012年第5期24卷 949-955页

作者： Sakura Akiyoshi Gobun sai Kiyoshi Yamauchi Department of Biological Science Faculty of Science Shizuoka University

Ioxynil, a phenolic herbicide, is known to exert thyroid hormone （TH） disrupting activity by interfering with TH-binding to plasma proteins and a step of the cellular TH-signaling pathway in restricted animal species. However, comparative studies are still lacking on the TH disruption. We investigated the interaction of [125I] ioxynil with serum proteins from rainbow trout, bullfrog, chicken, pig, rat, and mouse, using native polyacrylamide gel electrophoresis. Candidate ioxynil-binding proteins, which included lipoproteins, albumin and transthyretin （TTR）, differed among the vertebrates tested. Rainbow trout and bullfrog tadpole serum had the lowest binding activity for ioxynil, whereas the eutherian serum had the highest binding activity. The cellular uptake of, and response to, ioxynil were suppressed by rat serum greater than by tadpole serum. The cellular uptake of [125I]ioxynil competed strongly with phenols with a single ring, but not with THs. Our results suggested that ioxynil interferes with TH homeostasis in plasma and with a step of cellular TH-signaling pathway other than TH-uptake system, in a species-specific manner.

关键词： endocrine disruption ioxynil thyroid hormone serum transthyretin uptake

Synthesis of Sustainable Sulfur-Rich Copolymers as Mercury Sorbents at 130℃ Using Tung Oil as an Activator

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China Petroleum Processing & Petrochemical Technology 2023年第3期25卷 60-70页

作者： Lyu Ya Zhang sai School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Sulfur-rich copolymers made through inverse vulcanization exhibit a wide range of potentially valuable applications, for example as adsorbents to capture mercury pollution. Among the diverse second monomers of the copolymers, vegetable oil is a renewable resource, and recycled cooking oils have an important role in saving natural products. However, they need relatively high temperatures(160–180 ℃) to react with sulfur. To develop a low-temperature(130 ℃) reaction process for non-conjugated vegetable oil, we incorporate a small amount of tung oil, which contains conjugated trienes that can produce highly active free radicals during reactions. A variety of analytical techniques(proton nuclear magnetic resonance and Fourier-transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, and dynamic mechanical analysis) are used to characterize the chemical structures and physical properties of the copolymers. The addition of tung oil is found to significantly improve the thermal stability and mechanical properties of the copolymers. We also investigate the effect of different ratios of raw materials on the gel time, free sulfur content, glass transition temperature T_(g), and degradation temperature of the copolymers. We find that increasing the amount of tung oil in the raw material mixture decreases the gel time and free sulfur content, but increases T_(g) and the degradation temperature. The copolymers exhibit a high adsorption capacity for mercury ions up to 33 mg Hg^(2+) per gram of adsorbent. These results demonstrate the feasibility of using sulfur-rich copolymers as effective mercury removal adsorbents, with the potential for further improvement by foaming the copolymers into porous materials.

关键词： sulfur vegetable oil polymer mercury reaction mechanism

Alginate based encapsulation of polyphenols ofPiper betelleaves:Development,stability,bio-accessibility and biological activities

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Food Bioscience 2022年第3期47卷 998-1006页

作者： Ayesha Noor Musa Al Murad A.Jaya Chitra spoorthy N.Babu S.Govindarajan Centre for Bio Separation Technology (CBST) Vellore Institute of Technology (VIT)Vellore632014Tamil NaduIndia

Plant polyphenols have recently gained attention in nutraceutical and pharmaceutical industries due to their various therapeutic ***,the polyphenols are prone to oxidation,unstable towards heat,light,pH and their unpleasant taste also limits their *** usage of encapsulated polyphenols can alleviate these drawbacks and hence,efficient encapsulation methods have been *** present study focused on the synthesis of microspheres of Piper betle polyphenols by extrusion method using alginate and assesses the impact of alginate encapsulation on stability,bioavailability and therapeutic *** of Piper betle were studied for their stability,yield,size,characterized by using SEM for surface morphology and FTIR and evaluated for their bioavailability using in vitro simulated gastrointestinal digestion and therapeutic properties for a period of 24 *** results showed that encapsulation was successful using extrusion technique and the stability was improved as it protected the polyphenols and antioxidant from degradation for a period of 24 *** addition,bioavailability was also increased in small intestine and the antioxidant and antidiabetic properties were better retained after ***,this study showed that encapsulation of polyphenols of Piper betle leaves with alginate improved stability and can be a promising technique for food supplementation/nutraceutical with natural antioxidants.

关键词： Polyphenols Stability Encapsulation Alginate Antioxidant Antidiabetic