To increase the efficiency and reliability of the thermodynamics analysis of the hydraulic system, the method based on pseudo-bond graph is introduced. According to the working mechanism of hydraulic components, they ...To increase the efficiency and reliability of the thermodynamics analysis of the hydraulic system, the method based on pseudo-bond graph is introduced. According to the working mechanism of hydraulic components, they can be separated into two categories: capacitive components and resistive components. Then, the thermal-hydraulic pseudo-bond graphs of capacitive C element and resistance R element were developed, based on the conservation of mass and energy. Subsequently, the connection rule for the pseudo-bond graph elements and the method to construct the complete thermal-hydraulic system model were proposed. On the basis of heat transfer analysis of a typical hydraulic circuit containing a piston pump, the lumped parameter mathematical model of the system was given. The good agreement between the simulation results and experimental data demonstrates the validity of the modeling method.展开更多
Based on the idea that modules are independent of machines, different combinations of modules and machines result in different configurations and the system performances differ under different configurations, a kind o...Based on the idea that modules are independent of machines, different combinations of modules and machines result in different configurations and the system performances differ under different configurations, a kind of cyclic reconfigurable flow shops are proposed for the new manufacturing paradigm-reconfigurable manufacturing system. The cyclic reconfigurable flow shop is modeled as a timed event graph. The optimal configuration is defined as the one under which the cyclic reconfigurable flow shop functions with the minimum cycle time and the minimum number of pallets. The optimal configuration, the minimum cycle time and the minimum number of pallets can be obtained in two steps.展开更多
精确的环境感知是实现自主代客泊车(automated valet parking,AVP)功能的基础,传统的AVP系统主要依赖于单车的感知,但随着场端智能技术的不断发展,车端与场端之间协同交互成为自主代客泊车落地的必然趋势。本文提出了一种基于V2X车场协...精确的环境感知是实现自主代客泊车(automated valet parking,AVP)功能的基础,传统的AVP系统主要依赖于单车的感知,但随着场端智能技术的不断发展,车端与场端之间协同交互成为自主代客泊车落地的必然趋势。本文提出了一种基于V2X车场协同的地下停车场全域感知方法,该方法将地下停车场的全域感知问题转化为大规模图模型的构建与优化问题。通过输入场端激光雷达、摄像头的传感器信息以及智能网联车的感知数据,以车辆位姿为节点,建立多种边约束关系。为了提高感知精度,本文提出了一种融合车道级地图信息的大规模图模型方法,通过将停放车辆作为半静态信息约束,并结合车道级地图信息构建横向约束,在求解过程中引入滑动窗口以减小图模型的规模,最终以地图形式输出感知结果供车端使用。通过仿真实验和在占地面积为2 500 m^(2)以上的地下停车场场景中进行实地实验,结果表明,该方法显著提升了在复杂停车场环境下的感知能力,实现了地下停车场的全域感知。展开更多
以ChatGPT为代表的大型语言模型(LLMs)在多种任务中展现了巨大潜力。然而,LLMs仍然面临幻觉现象和长尾知识遗忘等问题。为了解决这些问题,现有方法通过结合知识图谱等外部知识显著增强LLMs的生成能力,从而提升回答的准确性和完整性。但...以ChatGPT为代表的大型语言模型(LLMs)在多种任务中展现了巨大潜力。然而,LLMs仍然面临幻觉现象和长尾知识遗忘等问题。为了解决这些问题,现有方法通过结合知识图谱等外部知识显著增强LLMs的生成能力,从而提升回答的准确性和完整性。但是,这些方法存在如知识图谱构建复杂、语义丢失以及知识单向流动等问题。为此,我们提出了一种双向增强框架,不仅利用知识图谱增强LLMs的生成效果,而且利用LLMs的推理结果补充知识图谱,从而形成知识的双向流动,并最终形成知识图谱与LLMs之间的循环正反馈,不断优化系统效果。此外,通过设计增强知识图谱(Enhanced Knowledge Graph,EKG),我们将关系抽取任务延迟到检索阶段,降低知识图谱的构建成本,并利用向量检索技术缓解语义丢失问题。基于此框架,本文构建了双向增强系统——BEKO(Bidirectional Enhancement with a Knowledge Ocean)系统,并在关系推理应用中相比传统方法取得明显的性能提升,验证了双向增强框架的可行性和有效性。BEKO系统目前已经部署在公开的网站——ko.zhonghuapu.com。展开更多
[目的/意义]科技文献复杂知识对象对科技文献中的深度知识内容进行细粒度、全面的知识表示,可有效支撑数智驱动的科学发现与知识发现,是重要的科技创新要素。[方法/过程]首先,通过轻量级本体构建、BRAT知识标注和Neo4j知识存储等步骤实...[目的/意义]科技文献复杂知识对象对科技文献中的深度知识内容进行细粒度、全面的知识表示,可有效支撑数智驱动的科学发现与知识发现,是重要的科技创新要素。[方法/过程]首先,通过轻量级本体构建、BRAT知识标注和Neo4j知识存储等步骤实现领域知识图谱构建,其次,本地化部署大语言模型ChatGLM2-6B并通过低秩适应(Low-Rank Adaptation,LoRA)技术微调模型,最后基于思维记忆(Memory of Thoughts,MOT)机制将知识图谱中的复杂知识注入提示中,通过与大语言模型的多轮问答从科技文献中抽取出复杂知识对象。[结果/结论]以有机太阳能电池(Organic Solar Cells,OSC)为例验证方法的有效性,结果表明融合知识图谱与大语言模型的抽取方法优于大语言模型单独支撑的抽取方法,在准确率P、召回率R和F1值3个指标上分别提升14.1%、10.3%和12.3%。知识图谱能够增强大语言模型对科技文献的复杂知识对象抽取能力,提升OSC领域的科技文献挖掘效率与准确性。展开更多
基金Project(51175518)supported by the National Natural Science Foundation of China
文摘To increase the efficiency and reliability of the thermodynamics analysis of the hydraulic system, the method based on pseudo-bond graph is introduced. According to the working mechanism of hydraulic components, they can be separated into two categories: capacitive components and resistive components. Then, the thermal-hydraulic pseudo-bond graphs of capacitive C element and resistance R element were developed, based on the conservation of mass and energy. Subsequently, the connection rule for the pseudo-bond graph elements and the method to construct the complete thermal-hydraulic system model were proposed. On the basis of heat transfer analysis of a typical hydraulic circuit containing a piston pump, the lumped parameter mathematical model of the system was given. The good agreement between the simulation results and experimental data demonstrates the validity of the modeling method.
基金Supported by National Key Fundamental Research and Development Project of P. R. China (2002CB312200)
文摘Based on the idea that modules are independent of machines, different combinations of modules and machines result in different configurations and the system performances differ under different configurations, a kind of cyclic reconfigurable flow shops are proposed for the new manufacturing paradigm-reconfigurable manufacturing system. The cyclic reconfigurable flow shop is modeled as a timed event graph. The optimal configuration is defined as the one under which the cyclic reconfigurable flow shop functions with the minimum cycle time and the minimum number of pallets. The optimal configuration, the minimum cycle time and the minimum number of pallets can be obtained in two steps.
文摘精确的环境感知是实现自主代客泊车(automated valet parking,AVP)功能的基础,传统的AVP系统主要依赖于单车的感知,但随着场端智能技术的不断发展,车端与场端之间协同交互成为自主代客泊车落地的必然趋势。本文提出了一种基于V2X车场协同的地下停车场全域感知方法,该方法将地下停车场的全域感知问题转化为大规模图模型的构建与优化问题。通过输入场端激光雷达、摄像头的传感器信息以及智能网联车的感知数据,以车辆位姿为节点,建立多种边约束关系。为了提高感知精度,本文提出了一种融合车道级地图信息的大规模图模型方法,通过将停放车辆作为半静态信息约束,并结合车道级地图信息构建横向约束,在求解过程中引入滑动窗口以减小图模型的规模,最终以地图形式输出感知结果供车端使用。通过仿真实验和在占地面积为2 500 m^(2)以上的地下停车场场景中进行实地实验,结果表明,该方法显著提升了在复杂停车场环境下的感知能力,实现了地下停车场的全域感知。
文摘以ChatGPT为代表的大型语言模型(LLMs)在多种任务中展现了巨大潜力。然而,LLMs仍然面临幻觉现象和长尾知识遗忘等问题。为了解决这些问题,现有方法通过结合知识图谱等外部知识显著增强LLMs的生成能力,从而提升回答的准确性和完整性。但是,这些方法存在如知识图谱构建复杂、语义丢失以及知识单向流动等问题。为此,我们提出了一种双向增强框架,不仅利用知识图谱增强LLMs的生成效果,而且利用LLMs的推理结果补充知识图谱,从而形成知识的双向流动,并最终形成知识图谱与LLMs之间的循环正反馈,不断优化系统效果。此外,通过设计增强知识图谱(Enhanced Knowledge Graph,EKG),我们将关系抽取任务延迟到检索阶段,降低知识图谱的构建成本,并利用向量检索技术缓解语义丢失问题。基于此框架,本文构建了双向增强系统——BEKO(Bidirectional Enhancement with a Knowledge Ocean)系统,并在关系推理应用中相比传统方法取得明显的性能提升,验证了双向增强框架的可行性和有效性。BEKO系统目前已经部署在公开的网站——ko.zhonghuapu.com。
文摘[目的/意义]科技文献复杂知识对象对科技文献中的深度知识内容进行细粒度、全面的知识表示,可有效支撑数智驱动的科学发现与知识发现,是重要的科技创新要素。[方法/过程]首先,通过轻量级本体构建、BRAT知识标注和Neo4j知识存储等步骤实现领域知识图谱构建,其次,本地化部署大语言模型ChatGLM2-6B并通过低秩适应(Low-Rank Adaptation,LoRA)技术微调模型,最后基于思维记忆(Memory of Thoughts,MOT)机制将知识图谱中的复杂知识注入提示中,通过与大语言模型的多轮问答从科技文献中抽取出复杂知识对象。[结果/结论]以有机太阳能电池(Organic Solar Cells,OSC)为例验证方法的有效性,结果表明融合知识图谱与大语言模型的抽取方法优于大语言模型单独支撑的抽取方法,在准确率P、召回率R和F1值3个指标上分别提升14.1%、10.3%和12.3%。知识图谱能够增强大语言模型对科技文献的复杂知识对象抽取能力,提升OSC领域的科技文献挖掘效率与准确性。
