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关于Boyce-Codd范式性质的讨论
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作者 王琦 《河北工学院学报》 1990年第1期61-64,共4页
本文给出一个关系数据库中关系模式成为Boyce—Codd范式的充要条件及其证明,明确了3NF和BCNF的主要差别—是否存在主属性对任何候选关键字的传递函数依赖性.
关键词 关系模式 传递依赖性 侯选关键字 关系数据库 主属性 boyce-codd范式
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关系模型规范化的有关理论与应用
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作者 孙昌言 《上海交通大学学报》 EI CAS CSCD 北大核心 2003年第4期523-526,共4页
在函数依赖的范畴内对关系模型的规范化理论及其运用问题进行了研究 ,证明了关于Boyce- Codd( BC)范式两个定义的等价性 ,提出了关于 BC范式的一个实用的判定定理并加以证明 .提出了一整套实用关系规范化的具体方法 。
关键词 关系规范化理论 函数依赖 boyce-codd范式 判定定理 规范化
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Implementation Aspects of Management Models for Network and Services in Smart Street Lighting
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作者 Mila Ilieva-Obretenova Radi Pipev 《Management Studies》 2024年第6期359-367,共9页
Value-added services in recent networks are provided with smart grid technology and particularly smart street lighting.The effective management of services and networks,structured as smart,imposes development of manag... Value-added services in recent networks are provided with smart grid technology and particularly smart street lighting.The effective management of services and networks,structured as smart,imposes development of management information model,which meets the requirements of network operator,service provider,and subscribers.Paradigm of smart grid defines only management framework without specification of architecture model and functions.The bright deployment of smart grid is based on development of management models.To this moment they are short specialized,cover only some of management functional areas,and reflect partially the actors’requirements.This paper represents implementation aspects of models for service management and network management in smart street lighting.Object-oriented method is used by models’design.Management functions for services and network are considered in installation,provision,configuration,maintenance,security,accounting,and performance.The focus is on problems regarding optimization of developed models and their reducing to Boyce-Codd Normal Form.The procedures for Service Installation and Service Provision are demonstrated with different methods:direct method and method with decomposition.The paper is intended to business developers,university professors,and students. 展开更多
关键词 value-added services smart grid management information model smart street lighting boyce-codd Normal Form
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