基于KBE的大型复杂冲压件工艺信息模型的研究

总结了工艺设计知识获取的途径,提出了大型复杂冲压件工艺设计知识表达的主要方法,运用KBE和特征技术,采用多种知识表达方法实现了对大型复杂冲压件工艺信息知识的描述,并建立了完整工艺信息知识模型,该模型将专家知识、零件信息、工艺设计过程知识、环境知识等工艺信息有效地集成在一起,通过控制机制来确保对知识的高效继承、创新、运用和管理,实现了高层次全局信息的表达.     

高炉专家系统知识表达方法

分析了高炉炉况知识的特征。对各种知识表达方法进行了具体的分析并给出了实例,提出了采用“产生式规则＋框架＋语义网＋神经网络＋过程”的综合知识表达方法。     

Fuzzy Method in CAPP

根据工艺知识所固有的不精确、难确定的特点，提出一种工艺知识的模糊表达方法，用类似于人类自然语言的方法对工艺知识进行描述。并利用这种知识表达方法，开发了一个模糊计算机辅助工艺过程设计（ＣＡＰＰ）专家系统。该系统可以根据设备的负荷情况动态地调整工艺过程设计，生成合理的工艺规程。实验结果表明：采用该模糊工艺知识表达方法，不仅方便了工艺知识的获取与检查，重要的是利用它可以对工艺知识进行更准确、更完整、更充分的描述，从而提高了ＣＡＰＰ系统性能。     

动力传动系统优化匹配专家系统的知识库构建

结合开发汽车动力传动系统优化匹配的专家系统(Matching Optimization of Automobile Powertrain Expert System,简称APOMES)的实践,采用VisualBasic编程语言和Microsoft Access数据库作为开发工具,依据汽车动力传动系统优化匹配的特点,将面向对象的知识表达方法和产生式规则的知识表达方法相结合,探讨了基于面向对象的APOMES知识库系统的构建,详细阐述了知识的表达方法、知识的存储形式、知识库系统的结构和管理方法。     

基于数据库的产生式知识表达及其在发酵过程中的应用

结合数据库技术的优势,提出了一种基于数据库的产生式知识表达方法,并说明了产生式规则的树型结构及其数据库表达。结合发酵过程生物量软测量专家系统的应用,给出了发酵过程生物量软测量建模知识的产生式规则定义及其知识库设计。实验表明,与一般顺序组织结构的产生式知识表达方法相比,基于数据库的产生式知识表达方法有利于提高专家系统的推理效率。     

M~2Sbot自重构机器人系统的拓扑自动表达

本文基于M2Sbot自重构机器人系统提出了拓扑构型的自动表达方法.根据单元模块本身的机械结构特性,对其进行了拓扑构型的简化,定义了各连接面与空间角度信息;分析了模块间可能的连接与连接方位,以有界深度优先搜索算法实现整体系统逻辑地址的自动定义,空间信息的自动描述以及系统中连接信息的自动表达.该表达方法能够准确描述自重构系统的连接信息与空间位姿,克服了现存的拓扑表达方法在存在回路的构型表达中的无解难题,为系统的重构算法与运动控制算法研究提供了一定的理论基础.     

汽车驾驶智能型防碰撞系统

汽车行驶与安全驾驶构成了一个多变量、具有不确定性、响应延迟的控制系统。把汽车自身和周围环境作为一个整体,作者提出了一种基于汽车－环境特征模型来描述驾驶过程中出现的各种状态的知识表达方法,讨论了汽车驾驶辅助操作专家系统的构成,仿真说明了所讨论的知识表示方法和系统构成法的可行性以及正确性。     

铁路信号计算机联锁系统的联锁逻辑变换

分析了铁路信号计算机联锁系统中流通的信息 ,将其分为涉安信息与非涉安信息两大类 ,并进一步提出当使用逻辑变量来表达涉安信息时的“安全侧逻辑状态”与“危险侧逻辑状态”。阐述了变换联锁信息表达形式的重要性 ,给出了根据故障 -安全原则实现安全逻辑变量的 2种表达形式。最后介绍了在研究实践中总结出的安全逻辑变量变换方法及其实效     

数据库及知识工程在中医专家系统中的应用

本文阐述了中医专家系统的特征和功能.从数据库及知识工程的应用出发,着重对构成中医专家系统的核心问题,如知识表达、推理控制策略、知识获取及人机信息交换等问题进行了研究.特别是对产生式规则与框架相结合的知识表达方法,表层模型和深层模型相结合的推理方式以及专家系统与知识库管理系统相结合的体系结构等进行了探讨.     

基于文本知识的决策支持系统的概念设计

文本知识是高层机构办公室宏观经济决策和政策分析的重要知识来源,实现这种决策支持系统涉及到对自然语言的理解和它的表达方法,以及在计算机内的存贮方式。目前这项工作在国际上处于刚开始研究的阶段。本文讨论了用概念图的表达方法,将文本知识存入RM/T规定的概念模式中。概念库由RM/T的特征实体组成,而知识库则由RM/T的联系实体和指示实体组成,文中还讨论了系统的结构和人机决策时有关的方法和算法。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that