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Even Search in a Promising Region for Constrained Multi-Objective Optimization

IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 474-486页

作者： fei Ming Wenyin Gong Yaochu jin School of Computer Science China University of GeosciencesWuhan 430074China IEEE Faculty of Technology Bielefeld UniversityNorth Rhine-Westphalia 33619Germany School of Engineering Westlake UniversityHangzhou 310030China

In recent years, a large number of approaches to constrained multi-objective optimization problems(CMOPs) have been proposed, focusing on developing tweaked strategies and techniques for handling constraints. However, an overly finetuned strategy or technique might overfit some problem types,resulting in a lack of versatility. In this article, we propose a generic search strategy that performs an even search in a promising region. The promising region, determined by obtained feasible non-dominated solutions, possesses two general ***, the constrained Pareto front(CPF) is included in the promising region. Second, as the number of feasible solutions increases or the convergence performance(i.e., approximation to the CPF) of these solutions improves, the promising region shrinks. Then we develop a new strategy named even search,which utilizes the non-dominated solutions to accelerate convergence and escape from local optima, and the feasible solutions under a constraint relaxation condition to exploit and detect feasible regions. Finally, a diversity measure is adopted to make sure that the individuals in the population evenly cover the valuable areas in the promising region. Experimental results on 45 instances from four benchmark test suites and 14 real-world CMOPs have demonstrated that searching evenly in the promising region can achieve competitive performance and excellent versatility compared to 11 most state-of-the-art methods tailored for CMOPs.

关键词： Constrained multi-objective optimization even search evolutionary algorithms promising region real-world problems

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Electroacupuncture alleviates cerebral ischemia and reperfusion injury via modulation of the ERK1/2 signaling pathway

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Neural Regeneration Research 2016年第7期11卷 1090-1098页

作者： xiao-lu jin Peng-fei Li Chun-bing Zhang jin-ping Wu xi-lian Feng Ying Zhang Mei-hong Shen Second Clinical College Nanjing University of Chinese Medicine Department of Clinical Laboratory Jiangsu Province Hospital of Traditional Chinese MedicineAffiliated Hospital of Nanjing University of Chinese Medicine College of Basic Medicine Nanjing University of Chinese Medicine

Electroacupuncture（EA） has anti-oxidative and anti-inflammatory actions,but whether the neuroprotective effect of EA against cerebral ischemia-reperfusion（I/R） injury involves modulation of the extracellular regulated kinase 1/2（ERK1/2） signaling pathway is *** cerebral artery occlusion（MCAO） was performed in Sprague-Dawley rats for 2 hours followed by reperfusion for 24 hours.A 30-minute period of EA stimulation was applied to both Baihui（DU20） and Dazhui（DU14） acupoints in each rat（10 mm EA penetration depth,continuous wave with a frequency of 3 Hz,and a current intensity of 1–3 m A） when reperfusion was *** significantly reduced infarct volume,alleviated neuronal injury,and improved neurological function in rats with ***,high m RNA expression of Bax and low m RNA expression of Bcl-2 induced by MCAO was prevented by *** substantially restored total glutathione reductase（GR）,glutathione（GSH） and glutathione peroxidase（GSH-Px） ***,Nrf2 and glutamylcysteine synthetase（GCS） expression levels were markedly increased by ***,the neuroprotective effects of EA were attenuated when ERK1/2 activity was blocked by PD98059（a specific MEK inhibitor）.Collectively,our findings indicate that activation of the ERK1/2 signaling pathway contributes to the neuroprotective effects of *** study provides a better understanding of the regulatory mechanisms underlying the therapeutic effectiveness of EA.

关键词： glutathione signaling neurological peroxidase occlusion infarct markedly neuronal blocked minute

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Magic Mark: a marking menu using 2D direction and 3D depth information

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Science China(Information Sciences) 2018年第6期61卷 238-240页

作者： fei LYU Rui xi Yuxin HAN Yujie LIU School of Digital Media and Design Arts Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network Systems and Network Culture Beijing University of Posts and Telecommunications

Menus are important interactive components of user interfaces,broadly applied to command exploration and selection[1].For large displays,RapMenu and touchless circular menus explored the design space of tilt and 2D direction[2,3].However,as one of the important input modalities,3D depth information has not been fully utilized for menu control in large displays.

关键词： Magic Mark Figure

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Microstructure and mechanical properties of high-strength high-pressure die-cast Mg–4Al–3La–1Ca–0.3Mn alloy

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Rare Metals 2021年第10期40卷 2956-2963页

作者： Peng-fei Qin Qiang Yang Yu-Ying He jing-Huai Zhang jin-Shu xie xi-Ru Hua Kai Guan Jian Meng Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Materials Science and Engineering University of TokyoTokyo 113-8654Japan

A new high-pressure die-cast(HPDC) Mg–4 Al–3 La–1 Ca–0.3 Mn(ALaX431) alloy with high strength has successfully been fabricated. This HPDC alloy in peakaged state exhibits tensile yield strength(TYS) of 220 MPa at room temperature and TYS of 145 MPa at 250 ℃,higher than the corresponding strength of HPDC Mg alloys reported so far. These high strengths are mainly due to the formation of fine grained structure, semi-continuous reticular structure consisting of stable Al_(3)La and(Mg,Al)2 Ca particles along grain boundaries and numerous nanoscale Al_(2)Ca precipitates within grains. Due to its higher strength than existing HPDC Mg alloys, the new developed alloy has great application potential.

关键词： Magnesium alloys High-pressure die-cast Mechanical property Intermetallic phase

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Stabilization of Cu/ZnO Based Catalysts by Nickel Additive in Methanol Decomposition

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Chemical Research in Chinese Universities 2001年第4期17卷 420-425页

作者： xi jing-yu WANG Zhi-fei LU Gong-xuan State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsThe Chinese Academy of SciencesLanzhou 730000P.R.China

A series of Cu/Zn based catalysts with and without Ni, prepared by the co-precipitation method, has been studied for methanol decomposition. CO and H2 are the major products. The Cu/Zn catalysts show a low initial activity and a poor stability. The formation of the CuZn alloys was observed in the deactivated Cu/Zn catalysts which were used for methanol decomposition at 250 . When small amounts of Ni were added in the catalyst, the Cu/Zn/Ni(molar ratio 5/4/ x) catalysts showed a high activity at a low temperature. The activity and the stability of the catalyst depend on the nickel content. The activity of the Cu/Zn/Ni catalysts was maintained at a. relatively stable value of 78% conversion of methanol with 95% selectivity of H2, 93% selectivity of CO, and a more than 70% yield of hydrogen was obtained at 250 C when x >1. The stability of the Cu/Zn/Ni (molar ratio 5/4/x) catalysts showed the maximum (ca 88%) when x=1. The stabilization effect of nickel on the Cu/Zn based catalysts may lead to the increasing of the dispersion of active Cu species and the prevention of CuZn alloys formation.

关键词： Nickel Cu/Zn catalysts Stabilization Methanol Decomposition

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Maximum relative entropy of coherence for quantum channels

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 1-6页

作者： Zhi-xiang jin Long-Mei Yang Shao-Ming fei xianqing Li-Jost Zhi-xi Wang Gui-Lu Long Cong-Feng Qiao School of Physics University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China School of Mathematical Sciences Capital Normal UniversityBeijing 100048China Max-Planck-Institute for Mathematics in the Sciences Leipzig 04103Germany Frontier Science Center for Quantum Information Beijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China CAS Center for Excellence in Particle Physics Beijing 100049China

Based on the resource theory for quantifying the coherence of quantum channels, we introduce a new coherence quantifier for quantum channels via maximum relative entropy. We prove that the maximum relative entropy for coherence of quantum channels is directly related to the maximally coherent channels under a particular class of superoperations, which results in an operational interpretation of the maximum relative entropy for coherence of quantum channels. We also introduce the conception of subsuperchannels and sub-superchannel discrimination. For any quantum channels, we show that the advantage of quantum channels in sub-superchannel discrimination can be exactly characterized by the maximum relative entropy of coherence for quantum channels. Similar to the maximum relative entropy of coherence for channels, the robustness of coherence for quantum channels has also been investigated. We show that the maximum relative entropy of coherence for channels provides new operational interpretations of robustness of coherence for quantum channels and illustrates the equivalence of the dephasing-covariant superchannels,incoherent superchannels, and strictly incoherent superchannels in these two operational tasks.

关键词： maximum relative entropy quantum channels quantum coherence resource theory

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A Method of Estimating Computational Complexity Based on Input Conditions for N-vehicle Problem

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Acta Mathematicae Applicatae Sinica 2010年第1期26卷 1-12页

作者： xi xia jin-chuan Cui Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

This paper proposes a method of estimating computational complexity of problem through analyzing its input condition for N-vehicle exploration problem. The N-vehicle problem is firstly formulated to determine the optimal replacement in the set of permutations of 1 to N. The complexity of the problem is factorial of N （input scale of problem）. To balance accuracy and efficiency of general algorithms, this paper mentions a new systematic algorithm design and discusses correspondence between complexity of problem and its input condition, other than just putting forward a uniform approximation algorithm as usual. This is a new technique for analyzing computation of NP problems. The method of corresponding is then presented. We finally carry out a simulation to verify the advantages of the method： 1） to decrease computation in enumeration; 2） to efficiently obtain computational complexity for any N-vehicle case; 3） to guide an algorithm design for any N-vehicle case according to its complexity estimated by the method.

关键词： Complexity of computation combinatorial optimization N-vehicle problem permutations inverse order

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Ablation characteristics of insulator under high-temperature gas dual-pulse erosion

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Defence Technology（防务技术） 2022年第10期18卷 1875-1885页

作者： Yang Liu xiao-cong Li Peng-fei Zhu Kun xi Northwestern Polytechnical University 710072Xi'anPR China xi'an Modern Chemistry Research Institute 710065PR China Department of Aerospace Propulsion Technology Science and Technology on CombustionInternal Flow and Thermal-Structure LaboratoryShaanxiPR China

This study numerically simulated and investigated the flow field characteristics of a typical dual-pulse solid rocket motor with a soft pulse separation device through thermal insulation ablation under high-temperature dual-pulse *** ablation rate of ethylene-propylene-diene monomer(EPDM)insulator was measured after the *** results were analyzed through scanning electron microscopy and microcomputed *** ablation mechanism of the EPDM insulator under the operation conditions of a dual-pulse solid rocket motor was evaluated by analyzing the *** results reveal that the internal flow field of the motor with a soft pulse separation device is *** original charred layer existing on the EPDM insulator surface in the first pulse combustor is the decisive factor affecting the final ablation rate of the dual-pulse motor during the second pulse operation,and the ablation characteristic region is easily formed with the exfoliation of the charred *** ablation rate difference of the insulator increases with gas velocity.

关键词： Dual-pulse solid rocket motor High temperature gas Ablation PSD Charred layer

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Therapeutic potentials of fasudil in liver fibrosis

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World Journal of Gastroenterology 2021年第45期27卷 7859-7861页

作者： Yue xi Peng-fei Xu Center for Pharmacogenetics and Department of Pharmaceutical Sciences University of PittsburghPittsburghPA 15261United States

Fasudil has the potential to prevent liver fibrosis by activating natural killer cells and inhibiting the proliferation of hepatic stellate *** may be a promising clinical therapeutic drug for the prevention and treat... 详细信息

关键词： Fasudil Liver fibrosis Natural killer cell Hepatic stellate cell Clinical therapeutic drug

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Influence of Endwall Air Injection with Discrete Holes on Corner Separation of a Compressor Cascade

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Journal of Thermal Science 2021年第5期30卷 1684-1704页

作者： CAO Zhiyuan GAO xi ZHANG xiang ZHANG fei LIU Bo School of Power and Energy Northwestern Polytechnical UniversityXi’an710072China

The aim of this study is to reveal the influence mechanism of endwall air injection with distributed holes on the corner separation of a highly loaded compressor cascade,so as to promote the application of injection in ***-hole and double-hole endwall injection schemes featuring different axial locations,pitchwise locations,injection mass rates and injection directions,were designed and *** showed that the corner separation was eliminated by endwall injection;the optimal single-hole injection scheme achieved an endwall loss coefficient reduction of 29.7%,with injection coefficient as low as 0.48%.The optimal axial location of single-hole endwall injection was at 82%axial chord,being the center of corner ***,as injection hole was located at upstream of it,endwall injection resulted in severer corner *** mid-span flow field was deteriorated after endwall injection,which was due to 3D flow effects,i.e.,AVDR(axial velocity density ratio)effect and low-momentum fluid spanwise migration *** optimal injection was achieved at low injection angle and from close to the suction surface on ***-hole injection exhibited inferior performance compared with single-hole,which was due to the interaction of the two injection streams and mixing of injection streams with the bulk stream.

关键词： compressor cascade corner separation flow control air injection endwall discrete hole injection

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