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求解一类线性多乘积规划问题的自适应分支定界算法

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应用数学 2025年第1期38卷 217-223页

作者：梁雨欣申培萍尹建菲华北水利水电大学数学与统计学院河南郑州450046

本文针对一类线性多乘积规划问题(LMP)提出一种具有自适应分支规则的分支定界算法.首先将问题(LMP)转化为等价问题,然后利用分段线性近似逼近其非凸约束的凹部分,通过所提出的自适应分支规则分割盒子并迭代细化分段线性近似,将问题(LMP... 详细信息

本文针对一类线性多乘积规划问题(LMP)提出一种具有自适应分支规则的分支定界算法.首先将问题(LMP)转化为等价问题,然后利用分段线性近似逼近其非凸约束的凹部分,通过所提出的自适应分支规则分割盒子并迭代细化分段线性近似,将问题(LMP)的求解过程转化为求解一系列二阶锥松弛问题(SOCR).此外,证明算法的收敛性和复杂度.最后,数值结果表明了该算法的有效性和可行性.

关键词：线性多乘积规划全局最优解自适应分支定界二阶锥松弛

BUCKLING AND POSTBUCKLING OF LAMINATED THIN CYLINDRICAL SHELLS UNDER HYGROTHERMAL ENVIRONMENTS

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Applied Mathematics and Mechanics(English Edition) 2001年第3期22卷 270-281页

作者： shen Hui-shen(沈惠申) School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai 200030 P R China

The influence of hygrothermal effects on the buckling and postbuckling of composite laminated cylindrical shells subjected to axial compression is investigated using a micro-to-macro-mechanical analytical model. The material properties of the composite are affected hy the variation of temperature and moisture, and are hosed on a micromechanical model of a laminate. The governing equations are based on the classical laminated shell theory, and including hygrothermal effects. The nonlinear prebuckling deformations and initial geometric imperfections of the shell were both taken into account. A boundary layer theory of shell buckling was extended to the case of laminated cylindrical shells under hygrothermal environments, and a singular peturbation technique was employed to determine buckling loads and postbuckling equilibrium paths. The numerical illustrations concern the postbuckling behavior of perfect and imperfect, cross-ply laminated cylindrical shells under different sets of environmental conditions. The influences played by temperature rise, the degree of moisture concentration, fiber volume fraction, shell geometric parameter, total number of plies, stacking sequences and initial geometric imperfections are studied.

关键词： structural stability postbuckling hygrothermal environments composite laminated cylindrical shell a boundary layer theory of shell buckling singular perturbation technique

Understanding co-run performance on CPU-GPU integrated processors： observations, insights, directions

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Frontiers of Computer Science 2017年第1期11卷 130-146页

作者： Qi ZHU Bo WU Xipeng shen Kai shen Li shen Zhiying WANG National Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 China Department of Computer Science North Carolina State University Raleigh NC 27695 USA Department of Electrical Engineering & Computer Science Colorado School of Mines Golden CO 80401 USA Department of Computer Science University of Rochester Rochester NY 14627 USA

Recent years have witnessed a processor develop- ment trend that integrates central processing unit （CPU） and graphic processing unit （GPU） into a single chip. The inte- gration helps to save some host-device data copying that a discrete GPU usually requires, but also introduces deep re- source sharing and possible interference between CPU and GPU. This work investigates the performance implications of independently co-running CPU and GPU programs on these platforms. First, we perform a comprehensive measurement that covers a wide variety of factors, including processor ar- chitectures, operating systems, benchmarks, timing mecha- nisms, inputs, and power management schemes. These mea- surements reveal a number of surprising observations. We an- alyze these observations and produce a list of novel insights, including the important roles of operating system （OS） con- text switching and power management in determining the program performance, and the subtle effect of CPU-GPU data copying. Finally, we confirm those insights through case studies, and point out some promising directions to mitigate anomalous performance degradation on integrated heteroge- neous processors.

关键词： performance analysis GPGPU co-run degrada-tion fused processor program transformation

Resolving the GPU responsiveness dilemma through program transformations

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Frontiers of Computer Science 2018年第3期12卷 545-559页

作者： Qi ZHU Bo WU Xipeng shen Kai shen Li shen Zhiying WANG National Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 China Jiangnan Institute of Computing Technology Wuxi 214083 China Department of Computer Science North Carolina State University Raleigh NC 27695 USA EECS Colorado School of Mines Golden CO 80401 USA Department of Computer Science University of Rochester Rochester NY 14627 USA

The emerging integrated CPU-GPU architectures facilitate short computational kernels to utilize GPU acceleration. Evidence has shown that, on such systems, the GPU control responsiveness （how soon the host program finds out about the completion of a GPU kernel） is essential for the overall performance. This study identifies the GPU responsiveness dilemma： host busy polling responds quickly, but at the expense of high energy consumption and interference with co-running CPU programs; interrupt-based notification minimizes energy and CPU interference costs, but suffers from substantial response delay. We present a programlevel solution that wakes up the host program in anticipation of GPU kernel completion. We systematically explore the design space of an anticipatory wakeup scheme through a timerdelayed wakeup or kernel splitting-based pre-completion notification. Experiments show that our proposed technique can achieve the best of both worlds, high responsiveness with low power and CPU costs, for a wide range of GPU workloads.

关键词： program transformation GPU integrated architecture responsiveness

In memory of the well-renowned Chinese cellular biologist Shien Sher-Pu

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Protein & Cell 2023年第1期14卷 1-3页

作者： Nan shen shen Liu School of Foreign Languages Anhui Agricultural UniversityHefei 230022China School of Humanities and Social Sciences Anhui Agricultural UniversityHefei 230022China Research Center for Philosophy of Physics University of Science and Technology of ChinaHefei 230022China

Academician Shien Sher-Pu(薛社普),one of the pioneers of cytobiology and reproductive biology research in China,initiated a research regarding red blood cells(RBC)nucleation mechanism in cell growth and differentiation *** had achieved breakthrough achievements in the development of male birth control pill and made an important contribution to the research of reproductive biology and cytopharmacology(Figs.1 and 2).

关键词： Academician 薛社普 breakthrough

Fluidization of micro-interconnected fluidized beds for chemical looping

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Particuology 2021年第1期19卷 136-145页

作者： Tianxu shen Xiao Zhu Tao Song Laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210042China

The micro-interconnected fluidized bed(MIFB)was designed to improve the evaluation condition of oxygen carrier,which is difficult to perform in a lab-scale interconnected fluidized bed because of the large demand for bed *** reduction of bed inventory in the MIFB was mainly achieved by the appropriate miniaturization of the reactor size,in which the wall effect and operating flexibility should be taken into *** hematite serving as the oxygen carrier,stable and flexible fluidization could be realized with 342.9 g of bed *** perforated plates were arranged in the middle of the reactor to improve gas-solid distribution,which also could restrain the slugging formation and increase the particle residence time by 28.9%.A different fluidization phenomenon was observed in this two-stage reactor in which the particle fluidization was reconstructed in the upper *** 48 h of cold operation,the hematite oxygen carrier attrition rate was evaluated as 0.151 wt.%/h corresponding to 660 h lifetime,where 12.5%of particle attrition was contributed by internal perforated *** excellent fitting performance was found between the pressure difference in the risers and the upward particle flow,but the correction factor should be adjusted according to the fluidization flow.

关键词： Micro chemical-looping reactor Bed inventory Internal perforated plate Hydrodynamics

Recent advances of flexible sensors for biomedical applications

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Progress in Natural Science:Materials International 2021年第6期31卷 872-882页

作者： Guozhen shen State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences

Ultrathin, soft, flexible and stretchable sensors offer good opportunity to design personal health diagnosis and treatment systems by fabricating wearable biomedical devices for continuous health monitoring and preventive medicine. This paper summarizes the recent advances of flexible sensors for next generation biomedical applications. Materials used for flexible sensors are first briefly introduced. Followed to this part, the latest developments of flexible sensors for biomedical applications are discussed in detail, including flexible sensors for skin-attached devices and implantable devices. Finally, the challenges and future research directions of flexible sensors are also discussed in the development of biomedical devices.

关键词： Flexible electronics Sensors Biomedical Electronic skins

Systematic screening procedure and innovative energy-saving design for ionic liquid-based extractive distillation process

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Frontiers of Chemical Science and Engineering 2023年第1期17卷 34-45页

作者： Tuanjie shen Liumei Teng Yanjie Hu Weifeng shen Anhui XinShiJi Pharmaceutical Co. Ltd.Hefei 230000China School of Materials Science and Engineering Chongqing University of Arts and SciencesChongqing 402160China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China

In the traditional extractive distillation process,organic solvents are often used as ***,environmental influence and high energy-consumption are significant problems in industrial *** this study,a systematic screening strategy and innovative energy-saving design for ionic liquid-based extractive distillation process was *** innovative energy-saving design focused on the binary minimum azeotrope mixtures isopropanol and ***,environmental impact and physical properties(e.g.,melting point and viscosity)of 30 ionic liquids were investigated.1-Ethyl-3-methyl-imidazolium dicyanamide and 1-butyl-3-methyl-imidazolium dicyanamide were selected as candidate *** analysis of these two ionic liquids was further performed via residue curve maps,isovolatility line and temperature *** innovative ionic liquid-based extractive distillation process combining distillation column and stripping column was designed and optimized with the objective function of minimizing the total annualized *** results demonstrate that the total annualized cost was reduced by 19.9%with 1-ethyl-3-methyl-imidazolium dicyanamide as the entrainer and by 24.3%with 1-butyl-3-methyl-imidazolium dicyanamide,compared with that of dimethyl *** method proposed in this study is conducive to the green and sustainable development of extractive distillation process.

关键词： ionic liquid entrainer screening feasibility analysis extractive distillation

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Ultrasound enhancement of the reduction of the Basic Green dye in wastewater by cast iron

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Journal of Environmental Sciences 2006年第1期18卷 1-3页

作者： shen Zhuang-zhi shen Jian-zhong Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

Dyes in wastewater are of particular environmental concern since they give an undesirable color to the waters, dye and their derivatives are harmful to human health and the environment （ Annadurai et al., 2002）. Due to their biological persistency, conventional biological treat-ment processes such as activated sludge process are ineffective for their removal（Shaul et al., 1991）. There is a need to develop effective methods for the degradation of such persistent organic pollutants, either to less harmful compounds or, more desirable, to their complete mineralization.

关键词： cast iron ultrasound Basic Green combined effect