I had a three-day holiday for this May Day.So I went to the coastal city Qingdao.It was sunny and hot.So I had great fun playing in the water.In the afternoon,I went shopping.But there were too many people in the mark...I had a three-day holiday for this May Day.So I went to the coastal city Qingdao.It was sunny and hot.So I had great fun playing in the water.In the afternoon,I went shopping.But there were too many people in the market.I didn’t really enjoy it.展开更多
This summer holiday,my older brother and I paid a visit to my grandparents by bus.The bus was crowded,but everyone seemed to be friendly and helpful.We enjoyed beautiful views all the way.At first,we saw one hill afte...This summer holiday,my older brother and I paid a visit to my grandparents by bus.The bus was crowded,but everyone seemed to be friendly and helpful.We enjoyed beautiful views all the way.At first,we saw one hill after another.展开更多
Formation control remains a critical challenge in cooperative multi-agent systems,particularly for Unmanned Underwater Vehicles(UUVs).Conventional approaches often suffer from several limitations,including reliance on...Formation control remains a critical challenge in cooperative multi-agent systems,particularly for Unmanned Underwater Vehicles(UUVs).Conventional approaches often suffer from several limitations,including reliance on global information,limited adaptability,high computational complexity,and poor scalability.To address these issues,we propose a novel bio-inspired formation control method for UUV swarms,drawing inspiration from the self-organizing behavior of fish schools.Our method integrates three key components:(1)a coordinated motion strategy without predefined targets that enables individual UUVs to align their movements via simple left or right rotations based solely on local neighbor interactions;(2)a target-directed movement strategy that guides UUVs toward specified regions;and(3)a dispersion control strategy that prevents overcrowding by regulating local spatial distributions.Simulation results confirm that the method achieves robust formation control and efficient area coverage using only local perception.Validation in a 9-UUV simulation environment demonstrates the approach’s flexibility,decentralization,and computational efficiency,making it particularly suitable for large-scale swarms with limited sensing and processing capabilities.展开更多
研究探讨了对话式阅读中的CROWD提示策略(完成性、回忆性、开放性、问题性、间距性)如何促进4~5岁幼儿心理理论(Theory of Mind, ToM)的发展。首先基于改进的卡西迪分析框架,确立了“心理状态的语言表征”和“错误信念的表征”两大标准...研究探讨了对话式阅读中的CROWD提示策略(完成性、回忆性、开放性、问题性、间距性)如何促进4~5岁幼儿心理理论(Theory of Mind, ToM)的发展。首先基于改进的卡西迪分析框架,确立了“心理状态的语言表征”和“错误信念的表征”两大标准,并以此为依据选取了7本富含心理理论内容的图画书作为分析样本。随后系统地剖析了五种CROWD提示策略在这些图画书阅读中的具体应用路径,通过列举实例说明了每种策略如何引导幼儿识别和推断角色的信念、意图、情绪等心理状态。最后得出结论:CROWD策略通过构建“行为–心理结果”的因果链条、训练双重表征能力、促进反事实推理等方式,能够有效提升幼儿的心理理论能力,并通过认知与情感的双向建构,实现对话式阅读教育效能的最优化。展开更多
Soft rock is one of the common geological conditions in coal mine underground water reservoir engineering.The cross-scale correlation analysis of water erosion soft lithology deterioration is very important for the sa...Soft rock is one of the common geological conditions in coal mine underground water reservoir engineering.The cross-scale correlation analysis of water erosion soft lithology deterioration is very important for the safety and stability of coal mine underground reservoir(CMUR)engineering.To address the issues of grain crowding and segmentation difficulties in cross-scale corelation analysis,as well as the limitations of traditional etching methods,this study proposes an image grain segmentation method based on deep learning algorithms,utilizing scanning electron microscopy and image process-ing techniques.The method successfully segments crowded grains and eliminates the interference from misplaced particles.In addition,indoor uniaxial compression tests were conducted to obtain the mechanical properties of sandstone samples with different water content.By quantitatively characterizing the macroscopic and microscopic deterioration degree of red sandstone samples with different water contents,the relationship between the strength changes of rock samples and the pet-rographic parameters such as grain size and grain shape is analyzed,and the influence law of soft lithology deterioration in CMUR engineering is revealed.The results indicate:(1)Water significantly weakens the mechanical properties and stability of soft rock.With increasing water content,the strength of sandstone samples continuously decreases,and the failure mode transitions from brittle to ductile failure.(2)The deterioration of micro-micro structures is the main cause of the decrease in mechanical properties of water-eroded soft rock.Grain size,grain area,and aspect ratio are negatively correlated with water content,indicating that hydrophilic minerals in soft rock dissolve under the action of water,leading to rock damage.(3)Grain size,area,and aspect ratio can serve as significant indicators for quantifying the strength changes of water-eroded soft rock.The research findings can be applied to stability assessment and disaster prevention in CMUR engineering.展开更多
Experiment design method is a key to construct a highly reliable surrogate model for numerical optimization in large-scale project. Within the method, the experimental design criterion directly affects the accuracy of...Experiment design method is a key to construct a highly reliable surrogate model for numerical optimization in large-scale project. Within the method, the experimental design criterion directly affects the accuracy of the surrogate model and the optimization efficient. According to the shortcomings of the traditional experimental design, an improved adaptive sampling method is proposed in this paper. The surrogate model is firstly constructed by basic sparse samples. Then the supplementary sampling position is detected according to the specified criteria, which introduces the energy function and curvature sampling criteria based on radial basis function （RBF） network. Sampling detection criteria considers both the uniformity of sample distribution and the description of hypersurface curvature so as to significantly improve the prediction accuracy of the surrogate model with much less samples. For the surrogate model constructed with sparse samples, the sample uniformity is an important factor to the interpolation accuracy in the initial stage of adaptive sam- pling and surrogate model training. Along with the improvement of uniformity, the curvature description of objective function surface gradually becomes more important. In consideration of these issues, crowdness enhance function and root mean square error （RMSE） feedback function are introduced in C criterion expression. Thus, a new sampling method called RMSE and crowd- ness enhance （RCE） adaptive sampling is established. The validity of RCE adaptive sampling method is studied through typical test function firstly and then the airfoil/wing aerodynamic opti- mization design problem, which has high-dimensional design space. The results show that RCE adaptive sampling method not only reduces the requirement for the number of samples, but also effectively improves the prediction accuracy of the surrogate model, which has a broad prospects for applications.展开更多
提出一种架构在P2P系统上可根据用户延迟需求而建立的匿名通信策略DDACM(delay demand-based anonymous communication mechanism).该策略采用TTL探测包确定成员之间的跳数,作为成员之间的延迟距离及选择转发结点的依据,当构建匿名通信...提出一种架构在P2P系统上可根据用户延迟需求而建立的匿名通信策略DDACM(delay demand-based anonymous communication mechanism).该策略采用TTL探测包确定成员之间的跳数,作为成员之间的延迟距离及选择转发结点的依据,当构建匿名通信的转发路径时,根据用户所提出的延迟需求参数DelayD,从自己的0到DelayD跳组中选择邻居结点作为转发代理.数学分析和模拟实验结果表明,该匿名通信机制在满足和Crowds相近匿名性的同时,可极大地降低通信时延,并使匿名通信系统具有可扩展性.展开更多
Nida’s functional equivalence enjoys a great popularity among translation theories,which plays an indispensable role in the practices of translation.Bulrush in the Crowds is a lyric prose cloaked in melancholy atmosp...Nida’s functional equivalence enjoys a great popularity among translation theories,which plays an indispensable role in the practices of translation.Bulrush in the Crowds is a lyric prose cloaked in melancholy atmosphere.This prose is written in simple but lively,vivid language.It is also highly readable,with flexible structures and various writing techniques.Short and condensed casual sentences are widely employed in this prose.Furthermore,it is good at using figure of speech.Thus,when translation is conducted,mood,structure,style and rhetorical devices should be taken into consideration.展开更多
文摘I had a three-day holiday for this May Day.So I went to the coastal city Qingdao.It was sunny and hot.So I had great fun playing in the water.In the afternoon,I went shopping.But there were too many people in the market.I didn’t really enjoy it.
文摘This summer holiday,my older brother and I paid a visit to my grandparents by bus.The bus was crowded,but everyone seemed to be friendly and helpful.We enjoyed beautiful views all the way.At first,we saw one hill after another.
基金supported by The Special Fund for Basic Scientific Research for Liaoning Provincial Governed Universities(2024JBZDZ004)Fishery Central Financial Support Project of Liaoning Province(2023)+5 种基金Liaoning Province Key Research and Development Plan(2023JH26/10200015)Natural Science Foundation of Liaoning Province(2020-KF-12-09)The Liaoning Provincial Education Commission Fund(LJKZ0730,QL202016)Applied Basic Research Project of Science and Technology Commission of Liaoning Province(2022JH2/101300187)Open Fund of Key Laboratory of Environmental Control Aquaculture of Ministry of Education(Dalian Ocean University)(202219)Liaoning Province Science and Technology Plan Joint Program(2024JH2/102600083).
文摘Formation control remains a critical challenge in cooperative multi-agent systems,particularly for Unmanned Underwater Vehicles(UUVs).Conventional approaches often suffer from several limitations,including reliance on global information,limited adaptability,high computational complexity,and poor scalability.To address these issues,we propose a novel bio-inspired formation control method for UUV swarms,drawing inspiration from the self-organizing behavior of fish schools.Our method integrates three key components:(1)a coordinated motion strategy without predefined targets that enables individual UUVs to align their movements via simple left or right rotations based solely on local neighbor interactions;(2)a target-directed movement strategy that guides UUVs toward specified regions;and(3)a dispersion control strategy that prevents overcrowding by regulating local spatial distributions.Simulation results confirm that the method achieves robust formation control and efficient area coverage using only local perception.Validation in a 9-UUV simulation environment demonstrates the approach’s flexibility,decentralization,and computational efficiency,making it particularly suitable for large-scale swarms with limited sensing and processing capabilities.
文摘研究探讨了对话式阅读中的CROWD提示策略(完成性、回忆性、开放性、问题性、间距性)如何促进4~5岁幼儿心理理论(Theory of Mind, ToM)的发展。首先基于改进的卡西迪分析框架,确立了“心理状态的语言表征”和“错误信念的表征”两大标准,并以此为依据选取了7本富含心理理论内容的图画书作为分析样本。随后系统地剖析了五种CROWD提示策略在这些图画书阅读中的具体应用路径,通过列举实例说明了每种策略如何引导幼儿识别和推断角色的信念、意图、情绪等心理状态。最后得出结论:CROWD策略通过构建“行为–心理结果”的因果链条、训练双重表征能力、促进反事实推理等方式,能够有效提升幼儿的心理理论能力,并通过认知与情感的双向建构,实现对话式阅读教育效能的最优化。
基金supported by the National Natural Science Foundation of China(51774196,52304093)China Postdoctoral Science Foundation(2023M741968)Shandong Provincial Natural Science Foundation(ZR2023ME086).
文摘Soft rock is one of the common geological conditions in coal mine underground water reservoir engineering.The cross-scale correlation analysis of water erosion soft lithology deterioration is very important for the safety and stability of coal mine underground reservoir(CMUR)engineering.To address the issues of grain crowding and segmentation difficulties in cross-scale corelation analysis,as well as the limitations of traditional etching methods,this study proposes an image grain segmentation method based on deep learning algorithms,utilizing scanning electron microscopy and image process-ing techniques.The method successfully segments crowded grains and eliminates the interference from misplaced particles.In addition,indoor uniaxial compression tests were conducted to obtain the mechanical properties of sandstone samples with different water content.By quantitatively characterizing the macroscopic and microscopic deterioration degree of red sandstone samples with different water contents,the relationship between the strength changes of rock samples and the pet-rographic parameters such as grain size and grain shape is analyzed,and the influence law of soft lithology deterioration in CMUR engineering is revealed.The results indicate:(1)Water significantly weakens the mechanical properties and stability of soft rock.With increasing water content,the strength of sandstone samples continuously decreases,and the failure mode transitions from brittle to ductile failure.(2)The deterioration of micro-micro structures is the main cause of the decrease in mechanical properties of water-eroded soft rock.Grain size,grain area,and aspect ratio are negatively correlated with water content,indicating that hydrophilic minerals in soft rock dissolve under the action of water,leading to rock damage.(3)Grain size,area,and aspect ratio can serve as significant indicators for quantifying the strength changes of water-eroded soft rock.The research findings can be applied to stability assessment and disaster prevention in CMUR engineering.
基金co-supported by the National Natural Science Foundation of China (Nos. 11402288 and 11372254)
文摘Experiment design method is a key to construct a highly reliable surrogate model for numerical optimization in large-scale project. Within the method, the experimental design criterion directly affects the accuracy of the surrogate model and the optimization efficient. According to the shortcomings of the traditional experimental design, an improved adaptive sampling method is proposed in this paper. The surrogate model is firstly constructed by basic sparse samples. Then the supplementary sampling position is detected according to the specified criteria, which introduces the energy function and curvature sampling criteria based on radial basis function （RBF） network. Sampling detection criteria considers both the uniformity of sample distribution and the description of hypersurface curvature so as to significantly improve the prediction accuracy of the surrogate model with much less samples. For the surrogate model constructed with sparse samples, the sample uniformity is an important factor to the interpolation accuracy in the initial stage of adaptive sam- pling and surrogate model training. Along with the improvement of uniformity, the curvature description of objective function surface gradually becomes more important. In consideration of these issues, crowdness enhance function and root mean square error （RMSE） feedback function are introduced in C criterion expression. Thus, a new sampling method called RMSE and crowd- ness enhance （RCE） adaptive sampling is established. The validity of RCE adaptive sampling method is studied through typical test function firstly and then the airfoil/wing aerodynamic opti- mization design problem, which has high-dimensional design space. The results show that RCE adaptive sampling method not only reduces the requirement for the number of samples, but also effectively improves the prediction accuracy of the surrogate model, which has a broad prospects for applications.
文摘提出一种架构在P2P系统上可根据用户延迟需求而建立的匿名通信策略DDACM(delay demand-based anonymous communication mechanism).该策略采用TTL探测包确定成员之间的跳数,作为成员之间的延迟距离及选择转发结点的依据,当构建匿名通信的转发路径时,根据用户所提出的延迟需求参数DelayD,从自己的0到DelayD跳组中选择邻居结点作为转发代理.数学分析和模拟实验结果表明,该匿名通信机制在满足和Crowds相近匿名性的同时,可极大地降低通信时延,并使匿名通信系统具有可扩展性.
文摘Nida’s functional equivalence enjoys a great popularity among translation theories,which plays an indispensable role in the practices of translation.Bulrush in the Crowds is a lyric prose cloaked in melancholy atmosphere.This prose is written in simple but lively,vivid language.It is also highly readable,with flexible structures and various writing techniques.Short and condensed casual sentences are widely employed in this prose.Furthermore,it is good at using figure of speech.Thus,when translation is conducted,mood,structure,style and rhetorical devices should be taken into consideration.
