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Hybrid artificial bee colony algorithm with variable neighborhood search and memory mechanism 被引量:57
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作者 FAN Chengli FU Qiang +1 位作者 LONG Guangzheng XING Qinghua 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2018年第2期405-414,共10页
Artificial bee colony(ABC) is one of the most popular swarm intelligence optimization algorithms which have been widely used in numerical optimization and engineering applications. However, there are still deficiencie... Artificial bee colony(ABC) is one of the most popular swarm intelligence optimization algorithms which have been widely used in numerical optimization and engineering applications. However, there are still deficiencies in ABC regarding its local search ability and global search efficiency. Aiming at these deficiencies,an ABC variant named hybrid ABC(HABC) algorithm is proposed.Firstly, the variable neighborhood search factor is added to the solution search equation, which can enhance the local search ability and increase the population diversity. Secondly, inspired by the neuroscience investigation of real honeybees, the memory mechanism is put forward, which assumes the artificial bees can remember their past successful experiences and further guide the subsequent foraging behavior. The proposed memory mechanism is used to improve the global search efficiency. Finally, the results of comparison on a set of ten benchmark functions demonstrate the superiority of HABC. 展开更多
关键词 artificial bee colony(ABC) hybrid artificial bee colony(HABC) variable neighborhood search factor memory mechanism
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Novel Shape-Memory Polymer with Two Transition Temperature Based on Two Different Memory Mechanism
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作者 Liu Guoqin Ding Xiaobing Cao Yiping Zheng Zhaohui Peng Yuxing 《合成化学》 CAS CSCD 2004年第z1期92-92,共1页
关键词 PMMA Tg Tm IPN Novel Shape-memory Polymer with Two Transition Temperature Based on Two Different memory mechanism
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A membrane-inspired algorithm with a memory mechanism for knapsack problems
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作者 Juan-juan HE Jian-hua XIAO +1 位作者 Xiao-long SHI Tao SONG 《Journal of Zhejiang University-Science C(Computers and Electronics)》 SCIE EI 2013年第8期612-622,共11页
Membrane algorithms are a class of distributed and parallel algorithms inspired by the structure and behavior of living cells. Many attractive features of living cells have already been abstracted as operators to impr... Membrane algorithms are a class of distributed and parallel algorithms inspired by the structure and behavior of living cells. Many attractive features of living cells have already been abstracted as operators to improve the performance of algorithms. In this work, inspired by the function of biological neuron cells storing information, we consider a memory mechanism by introducing memory modules into a membrane algorithm. The framework of the algorithm consists of two kinds of modules (computation modules and memory modules), both of which are arranged in a ring neighborhood topology. They can store and process information, and exchange information with each other. We test our method on a knapsack problem to demonstrate its feasibility and effectiveness. During the process of approaching the optimum solution, feasible solutions are evolved by rewriting rules in each module, and the information transfers according to directions defined by communication rules. Simulation results showed that the performance of membrane algorithms with memory cells is superior to that of algorithms without memory cells for solving a knapsack problem. Furthermore, the memory mechanism can prevent premature convergence and increase the possibility of finding a global solution. 展开更多
关键词 Membrane algorithm memory mechanism Knapsack problem
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Formation Mechanism of Curved Martensite Structures in Cu-based Shape Memory Alloys 被引量:2
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作者 Yujun BAI, Qiquan SHI,Guili GENG, Dongsheng SUN and Xiufang BIAN (Institute of Materials Engineering, Shandong University of Technology, Jinan 250061, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第1期79-81,共3页
The curved martensite structures have been observed in CuZnAI-based shape memory alloys by both transmission electron microscope and optical microscope. It was found that the curved martensite structures observed in a... The curved martensite structures have been observed in CuZnAI-based shape memory alloys by both transmission electron microscope and optical microscope. It was found that the curved martensite structures observed in as-solution treated, as-aged and as-trained alloys usually occurred around dislocation tangles or precipitate, at the plate boundary or grain boundary, and when the growing plates collided with each other or alternate mutually. 展开更多
关键词 Formation mechanism of Curved Martensite Structures in Cu-based Shape memory Alloys CU
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Role of OX40 in mechanisms of memory T cells in islet transplant tolerance
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作者 陈明 《外科研究与新技术》 2011年第4期289-290,共2页
Objective To investigate the role of OX40 in the mechanisms of memory T cells in islet transplant tolerance. Methods The expression of OX40 on native, like memory and memory CD8 + T cells was detected by RT - PCR. Spl... Objective To investigate the role of OX40 in the mechanisms of memory T cells in islet transplant tolerance. Methods The expression of OX40 on native, like memory and memory CD8 + T cells was detected by RT - PCR. Splenic T ceels from B6 mice were injected into Rag - / - mice via the tail vein,and the Rag mice were divided into three groups ( n = 8 each) : 展开更多
关键词 Role of OX40 in mechanisms of memory T cells in islet transplant tolerance
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Adaptive Memory Event-Triggered Observer-Based Control for Nonlinear Multi-Agent Systems Under DoS Attacks 被引量:7
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作者 Xianggui Guo Dongyu Zhang +1 位作者 Jianliang Wang Choon Ki Ahn 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2021年第10期1644-1656,共13页
This paper investigates the event-triggered security consensus problem for nonlinear multi-agent systems(MASs)under denial-of-service(Do S)attacks over an undirected graph.A novel adaptive memory observer-based anti-d... This paper investigates the event-triggered security consensus problem for nonlinear multi-agent systems(MASs)under denial-of-service(Do S)attacks over an undirected graph.A novel adaptive memory observer-based anti-disturbance control scheme is presented to improve the observer accuracy by adding a buffer for the system output measurements.Meanwhile,this control scheme can also provide more reasonable control signals when Do S attacks occur.To save network resources,an adaptive memory event-triggered mechanism(AMETM)is also proposed and Zeno behavior is excluded.It is worth mentioning that the AMETM's updates do not require global information.Then,the observer and controller gains are obtained by using the linear matrix inequality(LMI)technique.Finally,simulation examples show the effectiveness of the proposed control scheme. 展开更多
关键词 Adaptive memory event-triggered mechanism(AMETM) compensation mechanism denial-of-service(DoS)attacks nonlinear multi-agent systems(MASs) observer-based anti-disturbance control
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Review on structural fatigue of NiTi shape memory alloys:Pure mechanical and thermo-mechanical ones 被引量:3
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作者 Guozheng Kang Di Song 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2015年第6期245-254,共10页
Structural fatigue of NiTi shape memory alloys is a key issue that should be solved in order to promote their engineering applications and utilize their unique shape memory effect and super-elasticity more sufficientl... Structural fatigue of NiTi shape memory alloys is a key issue that should be solved in order to promote their engineering applications and utilize their unique shape memory effect and super-elasticity more sufficiently. In this paper, the latest progresses made in experimental and theoretical analyses for the structural fatigue features of NiTi shape memory alloys are reviewed. First, macroscopic experimental observations to the pure mechanical and thermo-mechanical fatigue features of the alloys are summarized; then the state-of-arts in the mechanism analysis of fatigue rupture are addressed; further, advances in the construction of fatigue failure models are provided; finally, summary and future topics are outlined. 展开更多
关键词 NiTi shape memory alloy Mechanical fatigue Thermo-mechanical fatigue Failure mechanism Failure model
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Diffusion tensor tractography studies on mechanisms of recovery of injured fornix 被引量:3
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作者 Sung Ho Jang Han Do Lee 《Neural Regeneration Research》 SCIE CAS CSCD 2017年第10期1742-1744,共3页
The fornix,which connects the medial temporal lobe and the medial diencephalon,is involved in episodic memory as an important part of the Papez circuit.The mechanisms of recovery of an injured fornix revealed by diffu... The fornix,which connects the medial temporal lobe and the medial diencephalon,is involved in episodic memory as an important part of the Papez circuit.The mechanisms of recovery of an injured fornix revealed by diffusion tensor tractography in the five studies are summarized as follows:1) recovery through the nerve tract from an injured fornical crus to the medial temporal lobe via the normal pathway of the fornical crus;2)recovery through the nerve tract originating from an ipsi-lesional fornical body connected to the ipsi-lesional medial temporal lobe via the splenium of the corpus callosum;3) recovery through the nerve tract from the ipsi-lesional fornical body extending to the contra-lesional medial temporal lobe via the splenium of the corpus callosum;4) recovery through the nerve tract originating from the ipsi-lesional fornical column connected to the ipsi-lesional medial temporal lobe;and 5) recovery through the nerve tract originating from the contra-lesional fornical column connected to the ipsi-lesional medial temporal lobe via the contra-lesional medial temporal lobe and the splenium of the corpus callosum.These diffusion tensor tractography studies on mechanisms of recovery of injured fornical crus appeared to provide useful information for clinicians caring for patients with brain injury,however,studies on this topic are still in the beginning stages. 展开更多
关键词 nerve regeneration fornix diffusion tensor tractography recovery mechanism memory assessment scale Papez neural regeneration
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Economic“Activity-Silent”Synaptic Mechanisms of Working Memory
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作者 Xiao Lin Ying Han +2 位作者 Peng Li Le Shi Lin Lu 《Neuroscience Bulletin》 SCIE CAS CSCD 2017年第6期760-762,共3页
Working memory(WM)allows humans to hold necessary information in temporary storage and manipulate such information online for higher-order cognitive functions,such as language understanding,decision making,and probl... Working memory(WM)allows humans to hold necessary information in temporary storage and manipulate such information online for higher-order cognitive functions,such as language understanding,decision making,and problem solving.Since its first appearance in the science of psychology in the 1960s,many theories have sought to elucidate the nature of WM.The most accepted model is 展开更多
关键词 TMS UMI Synaptic mechanisms of Working memory Activity-Silent Economic
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Towards the universal defense for query-based audio adversarial attacks on speech recognition system
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作者 Feng Guo Zheng Sun +1 位作者 Yuxuan Chen Lei Ju 《Cybersecurity》 EI CSCD 2024年第1期53-70,共18页
Recently,studies show that deep learning-based automatic speech recognition(ASR)systems are vulnerable to adversarial examples(AEs),which add a small amount of noise to the original audio examples.These AE attacks pos... Recently,studies show that deep learning-based automatic speech recognition(ASR)systems are vulnerable to adversarial examples(AEs),which add a small amount of noise to the original audio examples.These AE attacks pose new challenges to deep learning security and have raised significant concerns about deploying ASR systems and devices.The existing defense methods are either limited in application or only defend on results,but not on process.In this work,we propose a novel method to infer the adversary intent and discover audio adversarial examples based on the AEs generation process.The insight of this method is based on the observation:many existing audio AE attacks utilize query-based methods,which means the adversary must send continuous and similar queries to target ASR models during the audio AE generation process.Inspired by this observation,We propose a memory mechanism by adopting audio fingerprint technology to analyze the similarity of the current query with a certain length of memory query.Thus,we can identify when a sequence of queries appears to be suspectable to generate audio AEs.Through extensive evaluation on four state-of-the-art audio AE attacks,we demonstrate that on average our defense identify the adversary’s intent with over 90%accuracy.With careful regard for robustness evaluations,we also analyze our proposed defense and its strength to withstand two adaptive attacks.Finally,our scheme is available out-of-the-box and directly compatible with any ensemble of ASR defense models to uncover audio AE attacks effectively without model retraining. 展开更多
关键词 Adversarial attacks DEFENSE memory mechanism Query-based
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Deep-reinforcement-learning-based UAV autonomous navigation and collision avoidance in unknown environments
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作者 Fei WANG Xiaoping ZHU +1 位作者 Zhou ZHOU Yang TANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第3期237-257,共21页
In some military application scenarios,Unmanned Aerial Vehicles(UAVs)need to perform missions with the assistance of on-board cameras when radar is not available and communication is interrupted,which brings challenge... In some military application scenarios,Unmanned Aerial Vehicles(UAVs)need to perform missions with the assistance of on-board cameras when radar is not available and communication is interrupted,which brings challenges for UAV autonomous navigation and collision avoidance.In this paper,an improved deep-reinforcement-learning algorithm,Deep Q-Network with a Faster R-CNN model and a Data Deposit Mechanism(FRDDM-DQN),is proposed.A Faster R-CNN model(FR)is introduced and optimized to obtain the ability to extract obstacle information from images,and a new replay memory Data Deposit Mechanism(DDM)is designed to train an agent with a better performance.During training,a two-part training approach is used to reduce the time spent on training as well as retraining when the scenario changes.In order to verify the performance of the proposed method,a series of experiments,including training experiments,test experiments,and typical episodes experiments,is conducted in a 3D simulation environment.Experimental results show that the agent trained by the proposed FRDDM-DQN has the ability to navigate autonomously and avoid collisions,and performs better compared to the FRDQN,FR-DDQN,FR-Dueling DQN,YOLO-based YDDM-DQN,and original FR outputbased FR-ODQN. 展开更多
关键词 Faster R-CNN model Replay memory Data Deposit mechanism(DDM) Two-part training approach Image-based Autonomous Navigation and Collision Avoidance(ANCA) Unmanned Aerial Vehicle(UAV)
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World’s first spaceflight on-orbit demonstration of a flexible solar array system based on shape memory polymer composites 被引量:10
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作者 LAN Xin LIU LiWu +14 位作者 ZHANG FengHua LIU ZhengXian WANG LinLin LI QiFeng PENG Fan HAO SiDa DAI WenXu WAN Xue TANG Yong WANG Mian HAO YanYan YANG Yang YANG Cheng LIU YanJu LENG JinSong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2020年第8期1436-1451,共16页
With a 10%reversible compressive strain in more than 10 deformation cycles,the shape memory polymer composites(SMPCs)could be used for deployable structure and releasing mechanism.In this paper,without traditional ele... With a 10%reversible compressive strain in more than 10 deformation cycles,the shape memory polymer composites(SMPCs)could be used for deployable structure and releasing mechanism.In this paper,without traditional electro-explosive devices or motors/controllers,the deployable SMPC flexible solar array system(SMPC-FSAS)is studied,developed,ground-based tested,and finally on-orbit validated.The epoxy-based SMPC is used for the rolling-out variable-stiffness beams as a structural frame as well as an actuator for the flexible blanket solar array.The releasing mechanism is primarily made of the cyanate-based SMPC,which has a high locking stiffness to withstand 50 g gravitational acceleration and a large unlocking displacement of 10 mm.The systematical mechanical and thermal qualification tests of the SMPC-FSAS flight hardware were performed,including sinusoidal sweeping vibration,shocking,acceleration,thermal equilibrium,thermal vacuum cycling,and thermal cycling test.The locking function of the SMPC releasing mechanisms was in normal when launching aboard the SJ20 Geostationary Satellite on 27 Dec.,2019.The SMPC-FSAS flight hardware successfully unlocked and deployed on 5 Jan.,2020 on geostationary orbit.The triggering signal of limit switches returned to ground at the 139 s upon heating,which indicated the successful unlocking function of SMPC releasing mechanisms.A pair of epoxy-based SMPC rolled variable-stiffness tubes,which clapped the flexible blanket solar array,slowly deployed and finally approached an approximate 100%shape recovery ratio within 60 s upon heating.The study and on-orbit successful validation of the SMPC-FSAS flight hardware could accelerate the related study and associated productions to be used for the next-generation releasing mechanisms as well as space deployable structures,such as new releasing mechanisms with low-shocking,testability and reusability,and ultra-large space deployable solar arrays. 展开更多
关键词 shape memory polymer composite releasing mechanism shape memory polymer composite tubes flexible solar array
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On-chip mechanical computing:status,challenges,and opportunities 被引量:2
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作者 Luming Wang Pengcheng Zhang +2 位作者 Zuheng Liu Zenghui Wang Rui Yang 《Chip》 2023年第1期58-72,共15页
With increasing challenges towards continued scaling and improve-ment in performance faced by electronic computing,mechanical com-puting has started to attract growing interests.Taking advantage of the mechanical degr... With increasing challenges towards continued scaling and improve-ment in performance faced by electronic computing,mechanical com-puting has started to attract growing interests.Taking advantage of the mechanical degree of freedom in solid state devices,micro/nano-electromechanical systems(MEMS/NEMS)could provide alternative solutions for future computing and memory systems with ultralow power consumption,compatibility with harsh environments,and high reconfigurability.In this review,MEMS/NEMS-enabled memories and logic processors were surveyed,and the prospects and challenges for future on-chip mechanical computing were also analyzed. 展开更多
关键词 MEMS/NEMS switch MEMS/NEMS resonator Mechanical computing Mechanical memory Low-power computing
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Bioinspired Adaptive Gel Materials with Synergistic Heterostructures 被引量:2
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作者 Zi-Guang Zhao Yi-Chao Xu +1 位作者 Ruo-Chen Fang Ming-Jie Liu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第6期683-683,684-696,共14页
In nature, many biological soft tissues with synergistic heterostructures, such as sea cucumbers, skeletal muscles and cartilages, exhibit high functionality to adapt to complex environments. In artificial soft materi... In nature, many biological soft tissues with synergistic heterostructures, such as sea cucumbers, skeletal muscles and cartilages, exhibit high functionality to adapt to complex environments. In artificial soft materials, hydrogels are similar to biological soft tissues due to the unique integration of "soft and wet" properties and elastic characteristics. However, currently hydrogel materials lack their necessary adaptability, including narrow working temperature windows and uncontrollable mechanics, thus restrict their engineering application in complex environments. Inspired by abovementionedbiological soft tissues, researchers have increasingly developed heterostructural gel materials as functional soft materials with high adaptability to various mechanical and environmental conditions. This article summarizes our recent work on high-performance adaptive gel materials with synergistic heterostructures, including the critical design criteria and the state-of-the-art fabrication strategies of our gel materials. The functional adaptation properties of these heterostructural gel materials are also presented in details, including temperature, wettability, mechanical and shape adaption. 展开更多
关键词 Bioinspired materials Adaptive gels Hydrogels Mechanical strength Shape memory
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