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面向DAG任务的分布式智能计算卸载和服务缓存联合优化

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中山大学学报（自然科学版）（中英文） 2025年第1期64卷 71-82页

作者：李云南子煜姚枝秀夏士超鲜永菊重庆邮电大学通信与信息工程学院重庆400065 重庆邮电大学软件工程学院重庆400065

建立了一种有向无环图(DAG,directed acyclic graph)任务卸载和资源优化问题,旨在应用最大可容忍时延等约束实现系统能耗最小化。考虑到网络中计算请求高度动态、完整的系统状态信息难以获取等因素,最后使用多智能体深度确定性策略梯度(... 详细信息

建立了一种有向无环图(DAG,directed acyclic graph)任务卸载和资源优化问题,旨在应用最大可容忍时延等约束实现系统能耗最小化。考虑到网络中计算请求高度动态、完整的系统状态信息难以获取等因素,最后使用多智能体深度确定性策略梯度(MADDPG,multi-agent deep deterministic policy gradient)算法来探寻最优的策略。相比于现有的任务卸载算法,MADDPG算法能够降低14.2%至40.8%的系统平均能耗,并且本地缓存命中率提高3.7%至4.1%。

关键词：移动边缘计算多智能体深度强化学习计算卸载资源分配服务缓存

Defect-Tolerant Mapping of CMOL Circuit Targeting Delay Optimization

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Journal of Computer Science & Technology 2021年第5期36卷 1118-1132页

作者： xiao-Jing Zha Yin-Shui xia Shang-Luan Xie Zhu-Fei chu Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China

In view of the significant number of defective nanodevices in the Cmos/nanowire/MOLecular hybrid(CMOL)circuit,defect-tolerant mapping is an essential step to achieve correct logic operations in defective CMOL ***,less effort has been made to improve circuit delay by defect-tolerant *** this paper,the factors affecting the delay of mapped circuits are analyzed,and the path-tree based defect-tolerant mapping method for the delay optimization is *** the logic-domain,the terminology of the path tree is presented,and the logic circuit is first partitioned into multiple path ***,the mapping areas in the physic-domain are pre-planned for(near)critical path *** the mapping process,the specific mapping modes and an updating strategy are formulated to map the path trees:inputs are mapped based on input sorting;(near)critical path trees are mapped with priority,while the others are mapped in a hierarchical ***,an improved tabu search algorithm is employed to verify the validity of the proposed defect-tolerant mapping *** evaluations on the ISCAS benchmarks show that the proposed method can reduce circuit delay by 15.22%.

关键词： nanohybrid circuit defect-tolerant mapping delay optimization

Cu/Cr co-stabilization mechanisms in a simulated Al_(2)O_(3)-Fe_(2)O_(3)-Cr_(2)O_(3)-CuO waste system

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 259-270页

作者： Fanling Meng Yunxue xia Jianshuai Zhang Dong Qiu Yaozhu chu Yuanyuan Tang State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Chromium slag usually contains various heavy metals,making its safe treatment *** sintering has been applied to resolve this issue and emerged as an effective method for metal immobilization by incorporating heavy metals into stable crystal ***,there is limited knowledge about the reaction pathways adopted by multiple heavy metals and the co-stabilization functions of the crystal *** study the Cu/Cr co-stabilization mechanisms during thermal treatment,a simulated system was prepared using a mixture with a molar ratio of Al_(2)O_(3):Fe_(2)O_(3):Cr_(2)O_(3):CuO=1:1:1:*** samples were sintered at temperatures 600–1300℃ followed by intensive analysis of phase constitutions and microstructure development.A spinel phase(CuFe_(x)Al_(y)Cr_(2–x–y)O_(4))started to generate at 700℃ and the incorporation of Cu/Cr into the spinel largely complete at 900℃,although the spinel peak intensity continued increasing slightly at temperatures above 900℃.Fe_(2)O_(3)/Cr_(2)O_(3) was more easily incorporated into the spinel at lower temperatures,while more Al_(2)O_(3) was gradually incorporated into the spinel at higher ***,sintered sample microstructures became more condensed and smoother with increased sintering ***/Cr leachability substantially decreased after Cu/Cr incorporation into the spinel phase at elevated *** 600℃,the leached ratios for Cu and Cr were 6.28%and 0.65%,*** sintering temperature was increased to 1300℃,the leached ratios for all metal components in the system were below 0.2%.This study proposes a sustainable method for managing Cu/Cr co-exist slag at reasonable temperatures.

关键词： Spinel structure Copper Chromium Co-stabilization Thermal treatment

Mineral Chemistry and Geochemistry of Peridotites from the Zedang and Luobusa Ophiolites, Tibet: Implications for the Evolution of the Neo-Tethys

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Journal of Earth Science 2015年第6期26卷 893-910页

作者： Qiang li Bin xia Jianfeng li lianze xia Qiangtai Huang Zhongyu xia School of Marine Sciences Sun Yat-Sen University Qingdao Institute of Marine Geology Guang zhou Institute of Geochemistry Chinese Academy of Sciences Department of Earth Sciences Sun Yat-Sen University

We present a new dataset on platinum group elements（PGEs）, whole-rock major and trace elements, and mineral chemistry for the peridotites from the Zedang and Luobusa ophiolite suites, Tibet, in an attempt to better constrain the petrogenesis of the Zedang and Luobusa ophiolites and the tectonic evolution of the Neo-Tethys. Plots of chondrite-normalized PGE, PGE vs. Mg#, and PGE vs. Al_2O_3 suggest that the lherzolite and harzburgite from Zedang and Luobusa have similar PGE characteristics. The Zedang and Luobusa peridotites display U-shaped REE patterns and are enriched in some incompatible elements, indicative of melt-rock interaction. The PGE characteristics may be attributed to partial melting and heterogeneous melt-rock interaction. Mineral chemistry and whole rock major and trace elements data suggest that lherzolite and harzburgite from Zedang and Luobusa have similar geochemical properties. On the spinel Mg# vs. Cr# plot, the composition of the Zedang and Luobusa peridotites is consistent with both abyssal and subduction-zone peridotites. This study indicates that the Zedang and Luobusa peridotites have a similar origin and evolution path： they could have originated from a normal mid-ocean ridge environment and got refertilization in a supra-subduction zone setting.

关键词： Zedang-Luobusa ophiolite mantle peridotite PGE melt-rock interaction Yarlung Zangbo suture zone

Bi^(3+)-activated dual-wavelength emitting phosphors toward effective optical thermometry

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Chinese Chemical Letters 2024年第3期35卷 486-492页

作者： Yu Xue Yuqi Chen Guixian li Weixi xia Qinan Mao Lang Pei Meijiao liu liang chu Jiasong Zhong Center of Advanced Optoelectronic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China Department of Chemistry Zhejiang Sci-Tech UniversityHangzhou 310018China

Optical thermometry as an important local temperature-sensing technique,has received increasing attention in scientific and industrial ***,it is still a big challenge to develop luminescent materials with self-activated dual-wavelength emissions toward high-sensitivity optical ***,a novel ratiometric thermometric strategy of Bi^(3+)-activated dual-wavelength emission band was realized in the same lattice position with two local electronic states of La_(3)Sb_(1-x)Ta_xO_(7):Bi^(3+)(0≤x≤1.0)materials based on the different temperature-dependent emission behaviors,benefiting from the highlysensitive and regulable emission to the coordination environment of Bi^(3+).The structural and spectral results demonstrate that the emission tremendously shifted from green to blue with 68 nm and the intensity was enhanced 2.6 ***,the visual dual-wavelength emitting from two emission centers was presented by increasing the Ta^(5+)substitution concentration to 20%or 25%,mainly originating from the two local electronic states around the Bi^(3+)emission ***,the dual-wavelength with different thermal-quenching performance provided high-temperature sensitivity and good discrimination signals for optical thermometry in the range between 303 and 493 *** maximum relative sensitivity reached 2.64%/K(La_(3)Sb_(0.8)Ta_(0.2)O_(7):0.04Bi^(3+)@383 K)and 1.91%/K(La_(3)Sb_(0.75)Ta_(0.25)O_(7):0.04Bi^(3+)@388 K).This work reveals a rational design strategy of different local electronic states around the singledoping multiple emission centers towards practical applications,such as luminescence thermometry and white LED lighting.

关键词： Dual-wavelength emitting Cationic substitution Two local electronic states Optical thermometry Bi^(3+)-doped phosphor

The convergence of Lax-Oleinik semigroup for time-periodic Lagrangian

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Science China Mathematics 2014年第2期57卷 343-352页

作者： li xia School of Mathematics and Physics Suzhou University of Science and Technology

In this article,the convergence of so-called Lax-Oleinik semigroup is studied for time-periodic Lagrangian systems when the degree of freedom is greater than *** certain conditions,we show that the Lax-Oleinik semigroup converges if the rotation vector is completely *** such conditions,we will give another kind of convergence of the sequence Fc((x,s),(x′,s′+Tn)),the convergence of which is closely related to the Lax-Oleinik semigroup.

关键词： Lax-Oleinik semigroup Lagrangian systems Hamilton-Jacobi equation

Effect of Temperature on the Dynamic Recrystallization of AZ31 Alloy with Pulse Current

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1281-1286页

作者： Shu-xia lin Xing-Rong chu Zhen-Ming Yue Jun Gao School of Mechanical Electrical and Information Engineering Shandong University

The tensile tests of AZ31 magnesium alloy were carried out under room temperature, 100, 150 and 200 ℃ with andwithout pulse current. The effect of temperature on dynamic recrystallization （DRX） of AZ31 alloy was studied at differentconditions. One-parameter approach was used to analyze the critical conditions of DRX, the critical stress was obtainedunder different temperatures, and the related results were validated by metallography observation. The results showed thatDRX of AZ31 alloy occurred at 200 ℃ without pulse current. When pulse current with 150 Hz/50 V parameter wasapplied at room temperature, DRX occurred, while DRX was not completed until temperature over 150 ~C. With theanalysis result of critical conditions of DRX based on one-parameter approach, the relationship between critical stress andpeak stress obtained in this present study is σc = （0.746-0.773）σp.

关键词： AZ31 alloy Electroplasticity Dynamic recrystallization One-parameter approach

lightweight Authentication Protocol Based on Physical Unclonable Function

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Computers, Materials & Continua 2022年第9期72卷 5031-5040页

作者： Hanguang Luo Tao Zou chunming Wu Dan li Shunbin li chu chu Zhejiang Lab Hangzhou311121China Zhejiang University Hangzhou310058China Tsinghua University Beijing100084China The University of British Columbia VancouverV1V1V7Canada

In the emerging Industrial Internet of Things(IIoT),authentication problems have become an urgent issue for massive resource-constrained devices because traditional costly security mechanisms are not suitable for *** security protocol designed for resource-constrained systems should not only be secure but also efficient in terms of usage of energy,storage,and *** recently many lightweight schemes have been proposed,to the best of our knowledge,they are unable to address the problem of privacy preservation with the resistance of Denial of Service(DoS)attacks in a practical *** this paper,we propose a lightweight authentication protocol based on the Physically Unclonable Function(PUF)to overcome the limitations of existing *** protocol provides an ingenious authentication and synchronization mechanism to solve the contradictions amount forward secrecy,DoS attacks,and *** performance analysis and comparison show that the proposed scheme can better improve the authentication security and efficiency for resource-constrained systems in IIoT.

关键词： lightweight authentication physically unclonable functions

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Journal of Hydrodynamics 2012年第3期24卷 332-338页

作者： li Wei li xiao-ping li Shun-chu li Quan-yong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500 China Institute of Applied Mathematics Xihua University Chengdu 610039 China

When the classical nonlinear partial differential equations are used to model the fractal reservoir, based on the assumption of low compressibility fluids, the effects of the quadratic gradient term are ignored, which would be questionable for mixed gas reservoirs and low permeability reservoirs. To consider the influence of the wellbore storage, the nonlinear mathematical flow model of the fractal multilayer reservoir is built in this paper, with three kinds of outer boundaries （infinite boundaries, constant pressure boundaries and closed boundaries）. Using the Laplace transform method, the solutions for the dimensionless reservoir pressure and the bottom hole pressure in the Laplace space are obtained. An analysis shows that the solutions involve similar structures even for three different kinds of outer boundaries, and can be unified as a continuous fraction. The unified expression would make it more convenient to analyze the formation parameters, which greatly facilitates the development of the well test analysis software.

关键词： fractal multilayer reservoir quadratic gradient wellbore storage similar structure