为准确诊断和防治设施蔬菜病害提供有效工具,本研究系统收集了设施蔬菜作物(黄瓜、番茄和辣椒)43种病害的症状特征和相关病害防治管理知识,将病害的典型症状和一般症状进行特征提取,依据专家经验形成203条知识规则,将病害诊断知识数值...为准确诊断和防治设施蔬菜病害提供有效工具,本研究系统收集了设施蔬菜作物(黄瓜、番茄和辣椒)43种病害的症状特征和相关病害防治管理知识,将病害的典型症状和一般症状进行特征提取,依据专家经验形成203条知识规则,将病害诊断知识数值化与产生式规则相结合对知识进行有效的表达,建立了病害诊断与管理知识库。以SQL Server 2005作为数据库管理工具,建立了系统动态数据库。数据库用于存放用户输入病症信息、已知病症事实和推理过程产生的中间信息及最终结论。采用最佳优先搜索作为搜索策略,使用正向推理和正反混合推理,利用我们前期建立的"一步诊断"和"深入诊断"两个诊断推理模型实现病害诊断。利用Visual Studio 2008作为开发工具,综合集成知识库、数据库和推理模型,建立了基于Web的设施蔬菜病害诊断与防治管理专家系统。系统具有病害查询、病害诊断、病害防治与管理方法等查询与咨询功能,此外,专家也可在后台随时更新和添加新的蔬菜作物及病害。本研究建立的系统可为主要设施栽培蔬菜作物(黄瓜、番茄和辣椒)43种病害的早期诊断和防治管理提供决策支持。展开更多
This article proposes a novel fuzzy virtual force （FVF） method for unmanned aerial vehicle （UAV） path planning in compli-cated environment. An integrated mathematical model of UAV path planning based on virtual fo...This article proposes a novel fuzzy virtual force （FVF） method for unmanned aerial vehicle （UAV） path planning in compli-cated environment. An integrated mathematical model of UAV path planning based on virtual force （VF） is constructed and the corresponding optimal solving method under the given indicators is presented. Specifically,a fixed step method is developed to reduce computational cost and the reachable condition of path planning is proved. The Bayesian belief network and fuzzy logic reasoning theories are applied to setting the path planning parameters adaptively,which can reflect the battlefield situation dy-namically and precisely. A new way of combining threats is proposed to solve the local minima problem completely. Simulation results prove the feasibility and usefulness of using FVF for UAV path planning. Performance comparisons between the FVF method and the A＊ search algorithm demonstrate that the proposed approach is fast enough to meet the real-time requirements of the online path planning problems.展开更多
文摘为准确诊断和防治设施蔬菜病害提供有效工具,本研究系统收集了设施蔬菜作物(黄瓜、番茄和辣椒)43种病害的症状特征和相关病害防治管理知识,将病害的典型症状和一般症状进行特征提取,依据专家经验形成203条知识规则,将病害诊断知识数值化与产生式规则相结合对知识进行有效的表达,建立了病害诊断与管理知识库。以SQL Server 2005作为数据库管理工具,建立了系统动态数据库。数据库用于存放用户输入病症信息、已知病症事实和推理过程产生的中间信息及最终结论。采用最佳优先搜索作为搜索策略,使用正向推理和正反混合推理,利用我们前期建立的"一步诊断"和"深入诊断"两个诊断推理模型实现病害诊断。利用Visual Studio 2008作为开发工具,综合集成知识库、数据库和推理模型,建立了基于Web的设施蔬菜病害诊断与防治管理专家系统。系统具有病害查询、病害诊断、病害防治与管理方法等查询与咨询功能,此外,专家也可在后台随时更新和添加新的蔬菜作物及病害。本研究建立的系统可为主要设施栽培蔬菜作物(黄瓜、番茄和辣椒)43种病害的早期诊断和防治管理提供决策支持。
基金National Natural Science Foundation of China (60975073)Aeronautical Science Foundation of China (2008ZC13011)+1 种基金Research Foundation for Doctoral Program of Higher Education of China (20091102110006)Fundamental Research Funds for the Central Universities
文摘This article proposes a novel fuzzy virtual force （FVF） method for unmanned aerial vehicle （UAV） path planning in compli-cated environment. An integrated mathematical model of UAV path planning based on virtual force （VF） is constructed and the corresponding optimal solving method under the given indicators is presented. Specifically,a fixed step method is developed to reduce computational cost and the reachable condition of path planning is proved. The Bayesian belief network and fuzzy logic reasoning theories are applied to setting the path planning parameters adaptively,which can reflect the battlefield situation dy-namically and precisely. A new way of combining threats is proposed to solve the local minima problem completely. Simulation results prove the feasibility and usefulness of using FVF for UAV path planning. Performance comparisons between the FVF method and the A＊ search algorithm demonstrate that the proposed approach is fast enough to meet the real-time requirements of the online path planning problems.
