基于虚拟输出队列的新型NoC架构

提出一种基于虚拟输出队列的新型NoC架构,采用虚拟输出队列技术解决传统环形架构中存在的死锁和队头阻塞问题。通过改变环数、发包速率和Buff深度对系统进行性能评估,并与2D Mesh进行比较。实验结果表明,当节点数为16时,Buff深度为2个~4个flit大小的新型双环NoC架构性能较好。     

HBase架构中RPC客户端的通信性能优化

HBase已成为大数据存储、分析和处理的关键部件,对其进行性能优化是当前产业界和学术界的一个研究热点。HBase架构包括多个子系统,子系统之间的通信采用远程过程调用(Remote Procedure Call,RPC)通信机制,但这些子系统的RPC客户端采用的是阻塞通信模式,这种模式在客户端数据请求密集的情况下会引起线程的阻塞,影响了子系统之间的通信效率,降低了HBase的性能。首先分析了HBaseRPC客户端与服务端的通信机制,然后提出了一种HBaseRPC客户端非阻塞的通信模型,并通过Java NIO技术实现。实验结果表明,该模型有效降低了阻塞模式对通信性能的影响,提高了HBaseRPC客户端的通信性能。     

高清视频编码芯片架构设计挑战及多目标性能评价模型

FPGA和ASIC是高清视频编码器较合适的实现平台,视频编码芯片架构设计面临着较多挑战,包括吞吐量巨大、外存带宽极高、硬件资源消耗大、数据依赖阻塞正常流水、多目标性能较难均衡等.高清视频编码芯片架构设计需和算法优化相结合,以实现多个目标参数之间均衡,如何评价硬件架构的多目标性能,是首先要解决的问题.在分析芯片架构设计面临挑战、典型关注的多目标性能基础上,提出多目标性能参数的度量方法,对多个目标参数进行合理映射和归一化处理,并首次提出多目标性能评价模型.基于此模型,对主流的高清H.264/AVC编码芯片架构的多目标性能进行了评价和比较.该研究对于优化H.264/AVC及新一代HEVC编码芯片架构有着重要的参考价值.     

基于虚拟化安全网络扩展的SDN安全架构

采用控制、转发分离架构的软件定义网络（SDN）为网络的可编程性与开放性提供极大便利,但也给网络的安全性带来诸多挑战。提出一种虚拟安全网络（Virtualized Security Networks）与数据层中间盒扩展相结合的SDN安全架构,给出该架构的实现要点,并以实验验证其架构实现。测试表明该架构较其他方式具有更好的性能与可扩展性,同时其更有利于传统网络环境下的安全保障机制面向SDN网络架构的过渡迁徙。     

基于组件的动态软件更新

在分析影响动态软件更新的关键问题的基础上，从组件模型的设计出发来寻求系统架构对动态更新的支持，并利用动态插入拦截器来获取更新的安全点，从而实现了动态组件的热交换，其主要过程包括插入拦截器、阻塞调用、状态转移和请求重定向。基于该思想实现的集群高可用应用开发平台具有更好的可用性、可扩展性和运行性能。     

基于事件驱动的矿井应急联动Web平台设计

针对在Web请求处理线程总数有限的情况下,大量用户访问导致多业务应急联动通信Web平台服务器响应慢、阻塞、数据处理能力低等性能瓶颈问题,提出了基于事件驱动架构构建矿井多业务应急联动通信Web平台的方案,对比分析了同步模式与异步模式、SOA架构与事件驱动架构性能优势,介绍了应急联动系统Web平台异步架构设计。实际应用表明,采用异步架构实现的矿井多业务应急联动系统Web平台,跨平台、松耦合便于接入和扩展,数据处理能力高,整体响应时间短,且带来了Web平台服务器吞吐能力的提升和性能效率的提高。     

网络改造的重点：万兆网的规划与建设

对外经济贸易大学的网络基础性建设实现了万兆核心环形架构、重要区域万兆到汇聚、千兆到接人、百兆到桌面的网络架构。     

高并发条件下消息队列的设计与实现

针对高并发场景下短时间内流量暴增出现的系统性能问题,提出了一种基于页面控制、服务单元、数据缓存、流量控制技术的高性能系统架构。利用设计的消息队列实现了异步处理、应用解耦和流量削峰。实验表明,该系统架构能有效提升系统性能,消息队列能有效缓解服务器压力,性能测试良好。     

异构HDFS下的海量交通监控视频存储

针对在海量交通监控视频存储应用场景下异构HDFS无法有效利用数据节点性能这一问题,提出异构HDFS下一种数据节点层次化组织架构。该架构将数据节点按性能进行层次化分组,将性能接近的数据节点划分在同一分组,不同性能的数据节点则呈现梯度化组织,确保在交通监控视频写入时,关注度较高的事件视频优先存储在高性能数据节点上,在保证视频数据高效存储的同时,充分发挥节点性能以提高事件视频检索响应速度。实验表明该架构有效利用了集群资源,提高了系统吞吐量。     

GPRS/UMTS无线数据接入的控制与优化*

提出了一种新的基于代理的协议框架以提高在GPRS/UMTS网络中进行无线数据接入的性能。在此框架下研究了延时阻塞调度策略。该策略利用数据业务对延时不敏感的特性,在不增加带宽的前提下显著改善系统的响应性能,为实现该策略下的无线信道资源管理,设计了最优信道分配和自适应信道分配两种算法。理论分析和仿真表明,新的机制和算法可以显著地提高网络利用率并缩短系统的平均响应时间。     

H-R网络安全系统结构

文章首先分析了等级式+环形体系结构的特点，并在此基础上提出分布式安全体系结构方案：H-R网络安全系统结构。通过使用等级式结构，保证整个体系良好的可扩展性；通过使用安全令牌环协议(运行在环型结构中)，提高体系结构的健壮性，并简单介绍了安全令牌环协议的实现。最后对该体系结构进行了分析。     

Design and implementation of fault-tolerant multimicrocomputer systems

Distributed computer systems based on a multimicrocomputer structure offer the best preconditions to improve the reliability of a system and to realize fault tolerance. Basic fault-tolerant system (BFS), described in this paper, is the implementation of a fault-tolerant multimicrocomputer system. The architecture of BFS is a partially meshed ring structure, based on previous work. This kind of ring structure is appropriate for system monitoring and reconfiguration mechanisms.     

Learning in linear systolic neural network engines: analysis andimplementation

Linear systolic processor arrays are a widely proposed digital architecture for neural networks. This paper reports the analysis of a range of training algorithms implemented on a linear systolic ring, with a view to (a) identifying low-level instruction requirements, (b) assessing different hardware structures for PE implementation and (c) evaluating the impact of different array controller designs. Quantitative data is derived and used to determine cost-effective PE and controller hardware constructs.     

基于IMS的多媒体彩像业务的设计和实现

多媒体彩像(MRT)业务是一种采用多种媒体作为振铃音的增值业务。该文结合IP多媒体子系统(IMS)网络体系结构和MRT业务属性，提出了一种利用多媒体彩像业务平台(MRTSP)来实现MRT业务的方案，包括系统设计和基于会话发起协议(SIP)的信令流程，分析了相关特点并进行了总结。     

适合于多种并行计算结构的TRANSPUTER互连结构：HCCTT

本文将提出一种用于Ｔｒａｎｓｐｕｔｅｒ多机系统的Ｈａｍｉｌｔｏｎ回路连接三元树互连结构，并给出其构造算法。这种结构的Ｔｒａｎｓｐｕｔｅｒ多机系统在其通信服务程序的支持下，可以很好地适应扇型，星型，环和超环等多种并行结构的计算，并且系统的并行处理规模可扩充性强。     

Designing tributary networks with multiple ring families

Advances in telecommunication technology result in improved service, but can also lead to difficult and challenging network design problems. For example, networks in which nodes are connected by rings of optical fiber can now be used to provide rapid service restoration in the event of a failure. However, as a result, network designers are faced with the new problem of designing networks based on topological ring structures. In this paper, we consider the particular case of tributary network design. In a tributary network, a group of nodes are connected to a hub node, which is used as a point of interconnection with other parts of the network. For a particular network architecture, we describe an algorithm to determine how many topological ring structures are required, and which nodes should be included on each. We highlight connections between this problem and problems in vehicle routing.A common architecture for a telecommunications network consists of several tributary (often called access) networks, which connect locations to hubs, and a backbone network, which interconnects the hubs. This paper describes a heuristic approach for designing tributary networks based on self-healing rings (SHRs). The tributary network consists of multiple ring families, and each of those is comprised of one or more SHRs, called “stacked” rings. The SHRs in a given ring family are routed over the same cycle of optical fiber cables, but each SHR serves only a subset of the locations along the cycle. Each demand location is assigned to a single SHR on one of the ring families, whereas the hub is assigned to all SHRs on all ring families. A link that is used by some ring family incurs a fixed cost plus a variable cost per SHR associated with that family. Each SHR is constrained by the demand volume it can handle and by the number of locations it can serve. This tributary ring network design problem can be viewed as a complex version of a vehicle routing problem with a single-depot andmultiple vehicles. Our algorithm is initiated with numerous ring families. It then attempts to merge these families, while ensuring that savings are realized in terms of the sum of fixed and variable costs.     

基于区分服务的蛛网结构应用层多播模型

提出一种高效的蛛网结构的应用层多播模型,该模型以环形结构为基础,具有混乱情况下自愈性强、传输数据速度快等优点;在数据转发时根据实际应用采取push或pull的策略,同时取消了分层多播模型中的层中控制节点,降低了结构的复杂性;并根据网络状况动态优化系统的拓扑结构.通过仿真试验得知,应用该模型的应用层多播其性能得到提高.     

Scaling for agility: A reference model for hybrid traditional-agile software development methodologies

The adoption of agility at a large scale often requires the integration of agile and non-agile development elements for architecting a hybrid adaptive methodology. The challenge is ”which elements or components (agile or non-agile) are relevant to develop the context-aware hybrid adaptive methodology reference architecture?” This paper addresses this important challenge and develops a hybrid adaptive methodology reference architecture model using a qualitative constructive empirical research approach. In this way, we have uncovered the agility, abstraction, business value, business policy, rules, legal, context and facility elements or components that have not been explicitly modelled or discussed in International Standards (IS) such as the ISO/IEC 24744 metamodel. It is anticipated that a context-aware hybrid adaptive methodology can be architected by using the proposed context-aware hybrid adaptive methodology reference architecture elements for a particular situation when using a situational method engineering approach.     

混合星环交换结构的体系结构研究

弹性分组环是(RPR)是基于分组业务而优化的城域网络体系结构,针对环形结构传输星型业务的不足,出现了在环形结构中加入星型结构而形成的弹性分组星环网。弹性分组星环网成功地解决了RPR传输星型业务的问题。将弹性分组星环网的核心概念从物理结构中抽象出来用于交换结构,提出一种新型的适合高速分组交换结构混合星环交换结构。以排队论为工具对混合星环结构进行建模,分析星环结构的性能。结果表明混合星环结构是一种适合高速分组交换的结构。