基于Web的超大规模风电基地监测系统设计

为提升超大规模风电基地的发电品质,设计基于万维网技术的风电监测系统。根据风电监测系统的需求,建立以浏览器/服务器架构为核心的多层结构;根据数据处理的特点设计系统的数据库结构和数据服务程序结构;实现对风电基地内主要设施的监测、信息检索和统计报表等功能。该监测系统在宏观上反映了整个风电基地的出力状况,在微观上反映了风电场乃至单个风力发电机的工作状态。     

一种面向大规模系统域网络性能管理系统

当前系统域网络规模日益庞大,如何监控系统域网络复杂的流量行为、发现性能瓶颈以及可能的网络故障点,为系统域网络性能优化提供有效支持的需求已经日益迫切。首先提出了一种系统域网络的性能管理体系结构SNPMA,SNPMA采用了松耦合的分层结构,通过各层之间的协同实现性能管理的自动化和可操作性。在此基础上提出了一种网络性能评估模型NPEM,解决大规模网络中对现有网络设备性能状况无法正确评估、对网络运行状态无法进行有效预测的问题,进而提出了自适应并发策略性能监控方法STM,能动态调整采集数据的策略,较好地提高了采集数据的效率。在"天河二号"真实的网络环境下,对网络设备的性能进行分级评估和分析,验证了网络性能评估和分析模型。     

Modular multicast ATM switching architecture

A modular multicast packet switching architecture is proposed for the B-ISDN/ATM. In this switching architecture, we use the abilities of a broadcast bus suitable for multicasting services. Instead of using the concatenation of a copying network and a routing network, we use the same switching network to perform both copying and routing of multicast packets. This multicast switch architecture treats unicast and multicast packets in the same way; the delay time for these two kinds of packets has the same characteristics for the affective load in the switching. Through the modularity of this switching architecture, it is easy to dimension the switching system. We also include a mathematical analysis of this architecture.     

高性能交换结构综述

简述交换结构分类,从交换体系结构、调度算法和QoS保证等方面分别介绍了当前研究较多的单级、多级和多平面多级等多种交换网络,并简述这些交换网络的关键要素和研究结果,对比它们的实现复杂度、可扩展性、吞吐率、QoS保证等,指出高速交换结构发展中值得研究的若干问题,为进一步研究高速交换结构提供参考.     

A novel distributed architecture of large-scale multimedia storage system using autonomous object-based storage devices

In a large-scale multimedia storage system (LMSS) where the user requests for different multimedia objects may have different demands, placement and replication of the objects is an important factor, as it may result in an imbalance in loading across the system. Since replica management and load balancing is a crucial issue in multimedia systems, normally this problem is handled by centralized servers, e.g., metadata servers (MDS) in distributed file systems. Each object-based storage device (OSD) responds to the requests coming from the centralized servers independently and has no communication with other OSDs among the system. In this paper, we design a novel distributed architecture of LMSS, in which the OSDs have some kind of intelligences and can cooperate to achieve a high performance. Such an OSD, named as autonomous object-based storage device (AOSD), can replicate the objects to and balance the requests among other AOSDs, and handle fail-over and recovery autonomously. In the proposed architecture, we move the request balancing from centralized MDS to AOSDs and make the system more scalable, flexible, and robust. Based on the proposed architecture, we propose two different object replication and load balancing algorithms, named as “Minimum Average Waiting Time” (MAWT) and “One of the Best Two Choices” (OBTC), respectively. We validate the performance of the algorithms via rigorous simulations with respect to several influencing factors. Our findings conclusively demonstrate that the proposed architecture minimizes the average waiting time and at the same time carries out load balancing across servers.     

A recommendation system for repairing violations detected by static architecture conformance checking

This paper describes a recommendation system that provides refactoring guidelines for maintainers when tackling architectural erosion. The paper formalizes 32 refactoring recommendations to repair violations raised by static architecture conformance checking approaches; it describes a tool—called ArchFix—that triggers the proposed recommendations; and it evaluates the application of this tool in two industrial‐strength systems. For the first system—a 21 KLOC open‐source strategic management system—our approach has indicated correct refactoring recommendations for 31 out of 41 violations detected as the result of an architecture conformance process. For the second system—a 728 KLOC customer care system used by a major telecommunication company—our approach has triggered correct recommendations for 624 out of 787 violations, as asserted by the system's architect. Moreover, the architects have scored 82% of these recommendations as having moderate or major complexity. Copyright © 2013 John Wiley & Sons, Ltd.     

大规模交通网络实时模拟系统

以元胞自动机模型为微观模型，以CS模型为指导构建二维的大规模交通网络，利用多线程机制实现了整个模拟系统的高速运行。具体的模拟实验显示：该模拟系统完全可以满足实时模拟的需要，对于包含400个十字路口的交通网络，模拟系统每更新一次所需要的时间小于1s。     

A hybrid multi-agent system architecture for enterprise integration using computer networks

The manufacturing industries are now experiencing fierce pressure of competition from every corner on this planet. In addition, the advancement in computer networks and information technologies has been gradually reshaping the manufacturing companies by shifting from the industrial age to the information era. Due to these elevated competitiveness and advanced computer technology, a number of new manufacturing and management strategies (e.g., CE or CIM) have emerged for the innovation of manufacturing enterprises. Although they have different definitions and scopes, there are several common issues: inter-enterprise functions integration; inter-enterprise resources integration; and collaboration. This paper proposes a new multi-agent system (MAS) architecture to support the inter-enterprise functions/resources integration and collaboration over the networked environment, including the hybrid agent architecture and hybrid network architecture. In contrast to the existing agent architectures, the proposed agent architecture enables agents to exhibit the hybrid (continuous and discrete) behavior and interactions. In addition, our network architecture is more suitable for building the large-scale distributed manufacturing systems that are prone to dynamic random changes of their environment. Based on the proposed MAS architecture, a collaborative product development environment is implemented as a starting point, and a multidisciplinary team-oriented design problem is illustrated to provide the vision of the proposed MAS architecture.     

面向嵌套式系统结构的端口自动机行为表达方法

针对系统多层嵌套式结构范畴模型的动态行为描述与分析问题,提出一种基于端口自动机的行为表达方法（PAM）。该方法基于系统状态、输入和输出端口来定义对象和结构上的运算。通过证明发现：PAM在运算上具有结构保持特征,是一个函子。基于PAM,还就并行、串行和反馈等行为组合,以及应用等相关问题进行了讨论和分析,相关结论表明PAM可被应用于描述或分析具有嵌套式结构的系统动态行为。     

医院信息系统安全防范体系的设计与实现

如何建立一套科学有效的信息系统安全体系,保障医院信息系统可以安全、可靠、高效地运行已成为当前医院信息化建设中急待解决的问题.以某一三甲医院为例,从网络安全体系、服务器群安全体系、存储安全体系、数据安全策略等方面详细阐述了如何构架一个全面的数字化医院安全防范体系.     

A Novel Computer Architecture to Prevent Destruction by Viruses

In today‘s Internet computing world,illegal activities by crackers pose a serious threat to computer security.It is well known that computer viruses,Trojan horses and other intrusive programs may cause sever and often catastrophic consequences. This paper proposes a novel secure computer architecture based on security-code.Every instruction/data word is added with a security-code denoting its security level.External programs and data are automatically addoed with security-code by hadware when entering a computer system.Instruction with lower security-code cannot run or process instruction/data with higher security level.Security-code cannot be modified by normal instruction.With minor hardware overhead,then new architecture can effectively protect the main computer system from destruction or theft by intrusive programs such as computer viruses.For most PC systems it includes an increase of word-length by 1 bit on register,the memory and the hard disk.     

学习自动机在混杂系统切换控制上的初步应用

提出了学习自动机应用于混杂系统切换控制的方法,其主要思路是首先确定一个作为控制信号的行为集,利用学习自动机的学习能力,学习优化行为的发生概率,最终实现满意的控制.对一个实际应用中的混杂对象的切换控制的例子作了仿真,实际结果体现了学习自动机在混杂系统切换控制上的优化能力,证明了它的可实现性.     

3G传感器网络的技术特点与系统架构

随着3G通信技术的日益完善与应用,基于3G技术标准的无线传感器网络已经开始出现。本文对3G传感器网络的发展及其技术特点进行了介绍,并通过典型应用对3G无线传感器网络的系统结构、组网方式等进行详细探讨。     

总线型企业信息系统体系结构设计及应用

文中介绍了一种基于网络的新型信息系统构架－总线型信息系统结构。随着计算机软硬件和网络技术的发展,信息系统网络化和系统构架的研究工作成为领域内研究的热点。总线型信息系统从计算机网络化的角度出发研究系统的构建技术,提出了全新的系统结构和开发模型。这个模型有着较好的层次结构和可扩展,可维护性,并对电子审批等应用技术提供了简洁的解决方案,按照该结构设计的信息系统已在一个大型化工企业实现,取得了经济效益。     

A note on models for non-probabilistic analysis of packet switching networks

We consider two models commonly used in the literature to model adversarial injection of packets into a packet switching network. We establish the relation between these two types of models, and between them and the set of sequences of packets that allow stability. We also consider the adaptive setting in which packets are injected with only their source and destination but without a prescribed path to follow.     

基于动态模型的系统架构及建模平台实现

传统的基于静态模型的系统开发方法难以解决业务规则的快速扩展及变更带来的资源浪费等问题,工作流支持对工作内容进行良好的划分,并进行具体部署。结合SOA架构的业务流程再造能力,提出一种新的以三层模型为核心的支持快速、平滑、可重用的应用系统开发架构,对流程引擎和建模平台完成详细描述和设计,完成建模平台搭建工作,并以卡银行业务为例进行了基于三层模型的建模。结果表明,该系统开发架构具有很好的业务流程再造能力,可保证业务系统的持续稳定,达到提高生产组织水平和工作效率的目的。     

基于GIS技术的物流信息系统设计架构

为解决中小物流企业在基于GIS的物流信息系统应用中存在的问题,分析了传统的物流信息系统和基于GIS技术平台的物流信息系统的架构,指出了各自的优点及存在的缺陷.在此基础上,设计了一种面向服务的组件式GIS物流系统四层架构,以ArcSDE和ArcIMS为GIS开发平台给出了具体的部署方案.阐述了基础设施层、空间信息支撑层、业务服务支撑层、业务应用层及层中各组件之间的相互关系.以此开发的原型系统表明了架构方案的业务处理敏捷、系统接口松散耦合、功能构件可组合复用等特点.     

业务活动驱动系统体系结构执行研究

针对可执行体系结构研究中难以将业务体系结构的执行对应到系统体系结构的执行,并最终形成内在一致的执行体,提出了业务活动驱动系统体系结构执行的方法。该方法根据DoDAF中业务活动与系统功能多对多的关系,将业务活动用更详细的业务过程模型进行描述,并将过程模型中的行为单元对应到系统功能并触发该功能的执行。系统功能的执行将相应地触发一系列系统功能的执行,系统功能之间的系统数据交换将通过系统通信描述（SV-2）中的连接来实现,这样就建立起业务体系结构与系统体系结构之间的联系,并最终形成整个体系结构内在一致的执行体。该方法有效地解决了业务活动与系统功能之间多对多,无法形成内在一致的执行体问题,为体系结构的执行提供了一个明确、具体的可实施方案。     

面向大规模数据接入系统的负载平衡机制

当前分布式系统负载平衡算法存在问题：1）算法建立的系统中各节点角色固定,系统不具有自适应性;2）算法的通用性不高;3）负载迁移任务巨大,且负载平衡周期过长等。针对这些问题,提出了混合式负载平衡算法。首先,设计了一个分布式系统接收模型。模型将系统任务分为三层：接收层、处理层和存储层。在接收层使用了自定义的通信协议提高系统的接收性能。然后,负载平衡算法采用随机负载迁移策略,根据系统中节点的负载状态,对负载任务进行随机迁移。通过这种策略解决负载平衡周期过长和负载回迁问题。最后,通过分布式控制节点选择策略,使系统中节点具有自适应性。实验结果显示,在百万数据源以下,系统各层平均延迟处于毫秒级,系统负载平衡平均耗时在3 min以下。实验证明了所提出的负载平衡机制具有周期短、任务响应迅速等特点,能够提高分布式系统的接收性能。     

基于LNMPA架构的Web系统设计与实现

伴随数字化、网络化的快速发展,高校内涌现出众多的Web系统,这些Web系统参差不齐,安全性、易用性、可靠性等无法得到保障。把LAMP架构与LNMP架构各自的优点结合在一起形成新的网站服务器架构LNMPA,分析了该架构的特点及优势。采用基于MVC设计模式的ThinkPHP框架设计并实现了一套通用Web系统,该系统具备成本低、扩展灵活、性能稳定、数据安全、抗并发能力强等显著特点。