区块链支持下的微网电力市场设计及调度优化

为了发挥微网电力市场的活力,实现清洁能源的优化配置,在区块链支持下,针对微网电力市场的调度优化进行了研究。基于微网市场和区块链相似的网络拓扑结构,构建了基于区块链的微网市场总体框架。通过区块链管理平台获取数据信息,结合模型预测控制(MPC)方法,对微网市场调度运行进行优化。以IEEE 33节点系统为算例进行分析,结果验证了区块链支持下的微网交易模型的有效性,表明通过区块链管理平台结合MPC进行优化调度,增强了微网市场的鲁棒性,提高了电力交易过程中负荷功率预测的准确性以及能源利用率。     

USB总线通信原理的研究与分析

这里对USB总线的通信原理逻辑结构进行了分析及概括。在此基础上,又进一步分别分析了组成该框架的三个层次的基本组成元素数据包,事务处理以及数据传输有关原理,以及三者之间的关联关系。     

Phase transition in liquid Cu60Sn40 alloy

We report a liquid-liquid phase transition (LLPT) in Cu₆₀Sn₄₀ alloy suggested by the results of both the X-ray scattering experiment and viscosity measurement and verified by differential scanning calorimetry (DSC). The results show that a reversible LLPT (L(Cu₃Sn) + L(Sn)⇔L(Cu₆₀Sn₄₀)) may occur in the heating and cooling processes. The findings may throw light on the nature of liquids and enrich the knowledge of liquid state, further more be helpful to understand the melting and freezing mechanism.     

网络化制造中协同环境的访问控制技术

针对网络化制造中协同环境的安全问题,分析了现有访问控制模型以及网络化制造协同任务的应用特点.在此基础上将基于角色访问控制模型应用到协同环境中,扩展了ARBAC97,将协同环境中的事务同角色模型中的操作结合起来,给出了协同环境事务与角色模型操作的映射规则,在时序上保证了系统内部授权一致性.最后,讨论了该模型的体系结构和实现机制,该研究成果已在实际项目中得到了应用,取得了良好的应用效果.     

跨区跨省电力交易中的偏差电量分析与基于虚拟分时电价的偏差电量处理方法

偏差电量的处理作为交易结算工作的关键问题之一,无法适应电力市场环境下结算工作的要求,该文针对这一问题进行了讨论。总结了国内外偏差电量的相关研究,对跨区跨省电力交易中的偏差电量进行了分析,说明了偏差电量的实时价格属性;提出了基于虚拟分时电价的偏差电量处理方法,该方法利用1天中96个点的计划和计量数据,根据成分电量购售双方的负荷数据划分峰、平、谷时段,并利用虚拟分时电价修正偏差电量的分摊比例;最后,利用实际电网运行交易数据进行了算例分析,仿真结果更为合理地实现了偏差电量的分摊,说明了方法的有效性和实用性。     

一种新的分布事务处理模型与协议

本文提出了一种适合于当前网络环境客户机／服务器应用方式下的分布事务处理模型及基于远程过程调用（ＲＰＣ）的实现协议。分析与实验表明它不仅满足客户机／服务器 应用的具体特点与要求，而且可以克服各种两段式提交协议中由于协调者故障造成的阻塞，同时避免了三段式提交等协议为解决阻塞而引起的开销过大、实现复杂等问题。     

Cooperative transaction hierarchies: Transaction support for design applications

Traditional atomic and nested transactions are not always well-suited to cooperative applications, such as design applications. Cooperative applications place requirements on the database that may conflict with the serializability requirement. They require transactions to be long, possibly nested, and able to interact with each other in a structured way. We define a transaction framework, called acooperative transaction hierarchy, that allows us to relax the requirement for atomic, serializable transactions to better support cooperative applications. In cooperative transaction hierarchies, we allow the correctness specification for groups of designers to be tailored to the needs of the application. We usepatterns andconflicts to specify the constraints imposed on a group's history for it to be correct. We also provide some primitives to smooth the operation of the members. We characterize deadlocks in a cooperative transaction hierarchy, and provide mechanisms for deadlock detection and resolution. We examine issues associated with failure and recovery.     

实时事务并发控制机制的设计及其实现

文中结合实时事务并发控制机制的设计要求，叙述了实时关系数据库管理系统ＲＭＡＸＤＢｆｏｒＰＣ中有关实时事务并发控制机制的设计及实现，并提出了一系列新思想。     

Design and Implementation of a Concurrency Control Mechanism in an Object-Oriented Database System

This paper presents a practical concurrency control mechanism-Object-Locking in OODBMS.Object-Locking can schedule transactions,each of them can be considered as a sequence of high level operations defined on classes.By the properties of parallelity and commutativity between high level operations,proper lock modes for each operation are designed and the compatibility matrix is constructed.Wiht these lock modes,phantoms are kept away from databases and a high degree of concurrency is achieved.