Application of Object-oriented Representation in the Motorcycle Designed Expert System

Knowledge representation is one of the key technologies in the designed expert system.According to the requirement of total design of motorcycle, this paper researches the classificationof knowledgeand experienceof the motorcycle, analyses the points of knowledge representationmethod such as production rule, frameworkand object-oriented and so on, and puts forward the object-oriented knowledge representation method which is combined with abstraction, encapsulationand inheritanceof object-oriented technique. At last the authors realizes the knowledge representation of motorcycle designing under the language environmentof C++ and givesthe knowledge representationexamples of motorcyclebodywork designing.     

Designing protected areas to conserve riverine biodiversity: Lessons from a hypothetical redesign of the Kruger National Park

The process of designing protected areas to represent all ecosystems in an area adequately is becoming increasingly sophisticated. To date freshwater aquatic ecosystems have seldom been considered in this process. How much of a difference does it make when they are considered as well?This study examined the conservation of riverine biodiversity within 17 assessment units contained by the catchment areas of five perennial rivers flowing through Kruger National Park and two seasonal rivers that are largely contained within this park. Physical river types, fish species and invertebrate families or genera were used as surrogates of riverine biodiversity. Conservation planning software was used to select an optimal set of planning units to represent and maintain riverine biodiversity.The current spatial configuration of Kruger National Park, largely an accident of history, is particularly poor when assessed against the objective of conserving riverine biodiversity. Several alternative layouts are examined. These options are theoretical since there is little current opportunity to reassign land uses in the region. This study shows that substantially improved layouts for both riverine and terrestrial biodiversity are possible, under the constraint of the same total area under protection. The study also shows that even these optimal layouts are only partially successful in efforts to conserve fully representative samples of riverine biodiversity. Because of the longitudinal connectivity of rivers, conservation strategies that extend beyond protected areas are essential. Explicit conservation visions, targets and strategies need to be included in integrated water resource management plans.Based on the results of this study, nine recommendations are provided for increasing the effectiveness of current and future protected areas in conserving riverine biodiversity. These are to use systematic conservation planning to make biodiversity benefits explicit; mend the disconnect between terrestrial and freshwater conservation; use multiple surrogates wherever possible; be strategic about the collection and management of primary data; strive for maximum hydrologic connectivity; resist development pressure; foster good relationships across park fences; where relevant, pursue multi-national cooperation at the basin scale; and engage the value debate and resolve awareness and capacity constraints.     

奶牛肢蹄病辅助诊断专家系统的设计与实现

本研究旨在辅助基层奶牛养殖人员对奶牛肢蹄病的诊断,提高奶牛肢蹄病的诊疗水平。通过模拟兽医临床诊断思维,采用带有阈值的知识不确定性表达方法,应用置信系数多值逻辑对知识模糊性进行评价。借助C#开发语言、ASP.NET操作平台及SQL Server 2008r2数据库管理工具,设计基于B/S结构的奶牛肢蹄病辅助诊断专家系统。该系统实现对奶牛肢蹄疾病的正向诊断、反向诊断和鉴别诊断及对奶牛肢蹄疾病的病历管理、知识查询等功能。利用该系统可有效提高基层养殖人员对奶牛肢蹄病的诊断与治疗水平。     

大型水压机阀芯驱动系统双圆弧凸轮设计及应用

针对大型水压机阀芯驱动系统中开启驱动力巨大和瞬变的特点,提出了一种适合该特点的双圆弧组合凸轮升程曲线设计方法．该方法通过寻找组合圆弧曲线使凸轮的压力角在阀芯开启力最大时具有较小的值,在全程范围内具有较快的开启速度.通过齐次坐标变换建立了凸轮轮廓的数学模型,利用等效曲柄滑块机构分析了其运动特性.将该方法应用于300 MN模锻水压机阀芯驱动系统中的凸轮设计,运动学分析表明该凸轮在两段圆弧的衔接点处有较好的柔性,冲击小.工业现场应用表明双圆弧凸轮能有效降低装置的故障频率,为负载具有瞬变重载特点的凸轮设计提供了一种有效的方法.     

基于Q方法的漳州古城居民旅游感知及其形成机理研究

以漳州古城为例,采用Q方法,通过居民对Q命题的排序对古城旅游的感知进行主观评价,分析了居民的旅游感知类型.研究结果表明:漳州古城居民对当地的旅游发展存在正面和负面的双重感知;具体感知维度可以分为:"环境意识增加与经济如故型""社会失序与原真性削弱型""发展不均与经济获益型""文化传承与思想更新型"和"地方认同与成本增加型";整体上积极感知强于消极感知.由地方旅游引起的负面感知不断增强,因此,根据社会表征理论,分别从直接经验、社会互动以及媒体影响3个方面来探究居民旅游影响感知的形成机理,并据此提出相关的建议.     

我国贫困代际传递的现实表征、机制阐释与阻断措施

阻断贫困代际传递是巩固脱贫攻坚成果的关键。在对贫困代际传递的现实表征、内生和外生机制进行分析后发现:我国贫困代际传递具有弹性大、递减趋势和性别结构及地区异质性的特点;人力资本、社会资本和财富资本是贫困代际传递的主要内生因素,其中,人力资本的传递机制是最核心的机制,社会资本传递机制的实质是对贫困子女的社会排斥,而财富资本传递机制是贫困传递的最直接机制;人力资本、社会资本和财富资本三种机制相互作用。此外,教育制度、劳动力市场、贫困亚文化、社会保障和自然环境等通过对内生因素的作用,形成了对贫困代际传递的外生机制。     

“图—文”互文与明代小说插图的修辞实践

作为修辞学现代衍进的典范形态，图像修辞不仅体现出其理论延展的族群特征，同时也赋予争议已久的"图—文"互文以合法身份。以"图—文"互文的修辞视角审视明代小说插图的文本实践，在剖析小说插图三种基本范式的基础上揭示小说插图"图—文"之间的阐释、批评、预述与时空并置关系，这不仅是对小说插图"图—文"互文实践的深度确证，对当代视觉语境中的"图—文"争议乃至视觉叙事本身无疑都具有一种启发意义。     

基于本体的监测组态知识表示研究

为重用监测组态领域内已有知识，实现快速有效地开发监测组态系统，提出了一种基于本体的监测组态知识表示方法．该方法通过对监测组态知识的分类分析，构建基于本体的监测组态知识三层框架结构．在最低层定义一个公共的组态元模型，通过重用或继承元模型的类或关系，建立监测系统的组态知识模型，实现监测组态系统模型知识的重用．以压缩机监测系统组态为例，通过执行JESS规则引擎获得该监测系统的一个组态解决方案，验证了本文方法的可行性．