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本文首先分析了影响加的一致性与并行性的因素,然后给出了一个利用B-树锁和依赖图进行调度的算法。该算法可对元组一级进行控制,并提高了系统的效率。本文还证明了长法的正确性。 相似文献
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A dimeric serine protease Neriifolin S of molecular mass 94 kDa with milk clotting activity has been purified from the latex of Euphorbia neriifolia by anion exchange and size-exclusion chromatography. It hydrolyses peptidyl substrates l-Ala-pNA with highest affinity (Km of 0.195 mM) and physiological efficiency (Kcat/Km of 144.5 mM s). Enzyme belongs to the class of neutral proteases with pI value of 6.8, optimal proteolytic activity displayed at pH 9.5 and temperature 45 °C. Its proteolytic activity is strongly stimulated in the presence of Ca+2 ions and exclusively inhibited by serine protease inhibitors. Enzyme is fairly stable toward chemical denaturants, pH and temperature. The apparent Tm, was found to be 65 °C. Thermal inactivation follow first order kinetics with activation energy (Ea), activation enthalpy (ΔH∗), free energy change (ΔG∗) and entropy (ΔS∗) of 27.54 kJ mol−1, 24.89 kJ mol−1, −82.34 kJ mol−1 and 337.20 J mol−1 K−1. 相似文献
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铸造方法选择专家系统知识库的完备性检验 总被引:1,自引:0,他引:1
给出了问题可解的定义和知识库完备性的定义,并在理论上对知识库的完备性检验进行了探讨;讨论了知识库完备性检验的具体内容,并在铸造方法选择专家系统中得到了应用。 相似文献
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To achieve safe operation and to improve economics it is imperative to monitor and analyze demand and supply of utilities
and to meet utility needs in time. The main objective of motor/turbine processes is to manipulate optimal balances on steam
and electricity in utility plants. The optimal operation of motor/turbine processes is by far the most important to improve
economics in the utility plant. In order to analyze motor/turbine processes, steady state models for steam generation equipment
and steam distribution devices as well as turbine generators are developed and analyzed in this work. In addition, heuristics
concerning various operational situations are incorporated in the models. The motor/turbine optimal operation system is based
on utility models and operational knowledgebase, and provides optimal operating conditions when the amount of steam demand
from various steam headers is changed frequently. The optimal operation system also produces optimal selection of driving
devices for utility pumps to reduce operating cost. 相似文献
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针对扬声器音盆大批量定制生产模式提出一种快速响应客户需求的产品设计方案.该方案通过可扩充性知识库系统的辅助,运用创新性的基于特征的配置方法,借助Pro/E快速三维建模,使用FINECone软件的仿真分析,从而快速开发出满足客户需求的最终产品.整个开发过程通过项目管理驱动实现. 相似文献
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基于面向对象的知识库的设计 总被引:2,自引:0,他引:2
在人工智能中需要知识,才能更好地实现其目的。本文对颐和园导游系统知识库的构建,知识的提取,知识的更新等作了初步的探讨,并与其他功能子系统相配合,实现了颐和园导游对话系统。 相似文献
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基于知识库的知识发现结构研究 总被引:4,自引:0,他引:4
基于知识库的知识发现系统KDK(KnowledgeDiscoveryBasedonKnowledgebase)是直接从知识信息中提取潜在有用的、新颖的、未知的模式的过程,以解决目前知识爆炸而能提供给决策者有效的决策信息却矛盾很少。不同于KDD,KDK系统将直接作用于大型知识库的构建。该文讨论了KDK的描述性定义,给出了KDK的总体结构模型,及子系统描述。 相似文献
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