Other Cities’Distribution Institutions for Publishing Books in Modern Chinese Libraries:Taking Huating Bookstore,the Shanghai General Distribution Office of Modern Zhejiang Library,as an Example

Many modern Chinese libraries have established distribution agencies in other cities to distribute books published or sold on consignment.Huating Bookstore,which was once the Shanghai General Distribution Office of Zhejiang Library in modern times,is one of them.On the basis of a brief description of modern Zhejiang Library and its book publishing,as well as the overview of Huating Bookstore,the paper introduces and analyzes the ZPL Publishing Book Catalogue sent by Huating Bookstore,and the ZPL publishing and selling consignment books issued by Huating Bookstore.It points out that Huating Bookstore is a bridge between the ZPL located in Hangzhou and various retail ZPL publishing bookstores in Shanghai.Their production and sales relationship is a mutually beneficial one.

Load-balancing data distribution in publish/subscribe mode

To improve data distribution efficiency a load-balancing data distribution LBDD method is proposed in publish/subscribe mode.In the LBDD method subscribers are involved in distribution tasks and data transfers while receiving data themselves.A dissemination tree is constructed among the subscribers based on MD5 where the publisher acts as the root. The proposed method provides bucket construction target selection and path updates furthermore the property of one-way dissemination is proven.That the average out-going degree of a node is 2 is guaranteed with the proposed LBDD.The experiments on data distribution delay data distribution rate and load distribution are conducted. Experimental results show that the LBDD method aids in shaping the task load between the publisher and subscribers and outperforms the point-to-point approach.

Publish-Subscribe系统支付机制研究

已有的 pub- sub系统支付机制尚有许多缺陷 ,无法满足实际需求 .设计了一套新的基于可信任硬件 (安全协处理器、智能卡 )的支付机制 .这套机制具有良好的保密性、匿名性、高效性和公平性 ,而且实现了时间敏感信息的公平交易 .并对基于内容的 pub- sub系统支付问题给出了完整、有效和实用的解决方案 .

An SDN-Based Publish/Subscribe-Enabled Communication Platform for IoT Services

Publish/subscribe paradigm paves a way to integrate and serve many scalable, inter-operable Internet of Things(IoT) applications. The increasing IoT applications require new properties of publish/subscribe communication model, for example, strict quality of service(Qo S) guarantees, supporting a large number of widely distributed devices, etc. Software Defined Networking(SDN) enables personalized programming and individualized QoS supports for different applications. The combination of the two will have a good prospect. In this paper, we present an IoT-oriented communication platform which combines the publish/subscribe paradigm with SDN, aiming at establishing an IoT ecosystem to facilitate IoT services/applications accessing internet. We design the interaction logic of topic-based publish/subscribe middleware, and describe the setup and maintenance of topology information as well as event routing in detail, considering the characteristics of SDN. Finally, we exemplify its practicability with a deployed District Heating Control and Information Service System(DHCISS) and validity the effectiveness with some experiments.

Cross-Layer QoS Enabled SDN-Like Publish/Subscribe Communication Infrastructure for IoT

Publish/subscribe paradigm is often adopted to create the communication infrastructure of the Internet of Things(IoT)for many clients to access enormous real-time sensor data.However,most current publish/subscribe middlewares are based on traditional ossified IP networks,which are difficult to enable Quality of Service(QoS).How to design the next generation publish/subscribe middleware has become an urgent problem.The emerging Software Defined Networking(SDN)provides new opportunities to improve the QoS of publish/subscribe facilities for delivering events in IoT owing to its customized programmability and centralized control.We can encode event topics,priorities and security policies into flow entries of SDN-enabled switches to satisfy personalized QoS needs.In this paper,we propose a cross-layer QoS enabled SDN-like publish/subscribe communication infrastructure,aiming at building an IoT platform to seamlessly connect IoT services with SDN networks and improving the QoS of delivering events.We first present an SDN-like topic-oriented publish/subscribe middleware architecture with a cross-layer QoS control framework.Then we discuss prototype implementation,including topic management,topology maintenance,event routing and policy management.In the end,we use differentiated services and cross-layer access control as cross-layer QoS scenarios to verify the prototype.Experimental results show that our middleware is effective.

Providing Delay-Guaranteed Multicast Transmission Services for an SDN-Based Publish/Subscribe System

Providing end-to-end delay guarantees in traditional Internet is a complex task due to the distributed nature of TCP/IP protocols. Software Defined Networking(SDN) gives a new dimension to improve QoS(Quality of Service) as it can benefit from its flexibility, programmability and centralized view. In this paper, we provide delay-guaranteed data transmission service instead of "best efforts" service for a topic-based publish/subscribe system by means of exploring these specific features of SDN. We attribute this routing problem in such conditions to Delay-Constraint Lowest Cost Steiner Tree(DCLCST) problem. To solve it, we compute the shortest delay paths from source node to every subscribe node and the shortest cost paths from every subscribe node to any other node using dijkstra algorithm. Then we construct a delay-constraint least cost steiner tree for per-topic based on these paths as multicast tree. We also present experimental results to demonstrate the effectiveness of the algorithms and methods we proposed.

Embedding Authentication &Authorization in Discovery Protocols for Standard Based Publish/Subscribe Middleware: A Performance Evaluation

Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to data delivering and real time information adjourning. This kind of capability could be well ex-ploited by Peer-To-Peer (P2P) systems, Internet-wide as long as private ones, like in Public Safety or Civil Protection Communication Systems;but Pub/Sub specifications, and DDS/RTPS (Real Time Publish Sub-scribe) as well, usually do not provide Authentication & Authorization (AA) mechanisms. In the present work two important novelties are assessed: a possible scheme to implement AA in DDS/RTPS networks and a time performance evaluation study about embedded Authentication in RTPS.

A Real-Time-Enabled, Blackboard-Based, Publish/Subscribe Architecture for Wireless Sensor Nodes

Wireless sensor network nodes have only limited resources concerning memory and battery life-time. Mem- ory can be efficiently used by sharing data, and the life-time of a battery can be extended, when the node has long power saving sleep-phases. We propose a publish/subscribe architecture that achieves these two aims. The results of our work are of great interest for sensor application developers, giving them now the opportu- nity to use our architecture for sharing data among different applications on the node as well as the different layers of the operating system. We introduce a blackboard which is used for centrally storing published val- ues, like measured data from a monitored sensor. This makes it possible to share stored data without monitoring the sensors once again, which is advantageously concerning power consumption, memory space, and reaction time. Beside the proposed publish/subscribe method for sensor nodes with its notification possibili- ties, our architecture fulfills also real-time requirements. We show how the well-known sensor operating system MANTIS OS can be extended by a real-time enabled, blackboard-based publish/subscribe architect- ture. This architecture and first of all its implementation is of special interest for cross layer optimization of sensor applications. Cross-layer approaches benefit from our architecture because the available implementa- tion can be used as an efficient framework for central storing and managing of shared values.

Research of Publish and Subscribe Model Based on WS-Notification

WS-Notification bundle of standards, WS-BaseNotification, WS-Topics, and WS-BrokeredNotification, can be used as a general purpose publish/subscribe interface for Service Oriented Architectures. We provide an overview of the WS-Notification specification and describe a modified publish and subscribe model based on WS-Notification. The model is an adaptive policy-driven notification framework that can help enterprises to meet the flexibility and respon-siveness requirements of the enterprise. With the modified publish/subscribe model, information consumers can dy-namically and declaratively create and configure entities on their behalves to manage their distribution requirements.

Connected-Vehicle Data Exchanges and Positioning Computing Based on the Publish-Subscribe Paradigm

Connected vehicles for safety and traffic efficient applications require device-to-device connections supporting one-to-many and many-to-many communication, precise absolute and relative positioning and distributed computing. Currently, the 5.9 GHz Dedicated Short Range Communications (DSRC) and 4G-Long-Term Evolution (LTE) are available for connected vehicle services. But both have limitations in reliability or latency over large scale field operational tests and deployment. This paper proposes the device-to-device (D2D) connectivity framework based on publish-subscribe architecture, with Message Queue Telemetry Transport (MQTT) protocol. With the publish-subscribe communication paradigm, road mobile users can exchange data and information in moderate latency and high reliability manner, having the potential to support many Vehicle to Everything (V2X) applications, including vehicle to vehicle (V2V), vehicle to roadside infrastructure (V2I), and vehicle to bicycle (V2B). The D2D data exchanges also facilitate computing for absolute and relative precise real-time kinematic (RTK) posi-tioning. Vehicular experiments were conducted to evaluate the performance of the proposed publish-subscribe MQTT protocols in term of latency and reliability. The latency of data exchanges is measured by One-trip-time (OTT) and the reliability is measured by the packet loss rate (PLR). Our results show that the latency of GNSS raw data exchanges between vehicles through 4G cellular networks at the rate of 10 Hz and the data rates of 10 kbps are less than 300 ms while the reliability is over 96%. Vehicular positioning experiments have also shown that vehicles can exchange raw GNSS data and complete mov-ing-base RTK positioning with the positioning availability of 98%.

Towards delivery of situational information in distributed environments

In the distributed environment,robots should be able to provide users with adaptive services automatically according to the situational information changing dynamically which is obtained from both users and their environments.The workflow depends on situational information obtained from physical environments and provides context-aware services automatically based on the information retrieved.And the workflow in the business processes and the distributed computing environments have supported the automation of services by connecting tasks.The workflow needs to specify ubiquitous situational information as state-transition constraints.However,the delivery and use of sensor data in the workflow is a difficult problem for the robot system.In order to bridge the gap between applications and low-level constructs and to acquire raw situational information for the execution of the context-aware workflow in the robot systems,this paper presents an approach which can achieve the sensor data transmission between a sensing server and a robot system easily.

Content subscribing mechanism in P2P streaming based on gamma distribution prediction

P2P systems are categorized into tree-based and mesh-based systems according to their topologies. Mesh-based systems are considered more suitable for large-scale lnternet applications, but require optimization on latency issue. This paper proposes a content subscribing mechanism （CSM） to eliminate unnecessary time delays during data relaying. A node can send content data to its neighbors as soon as it receives the data segment. No additional time is taken during the interactive stages prior to data segment transmission of streaming content. CSM consists of three steps. First, every node records its historical segments latency, and adopts gamma distribution, which possesses powerful expression ability, to express latency statistics. Second, a node predicts subscribing success ratio of every neighbor by comparing the gamma distribution parameters of the node and its neighbors before selecting a neighbor node to subscribe a data segment. The above steps would not increase latency as they are executed before the data segments are ready at the neighbor nodes. Finally, the node, which was subscribed to, sends the subscribed data segment to the subscriber immediately when it has the data segment. Experiments show that CSM significantly reduces the content data transmission latency.

弹幕不文明语言分布及对策研究

[目的/意义]随着弹幕文化的普及和大众化,对弹幕语言尤其是弹幕不文明语言的调查研究更显重要。弹幕不文明语言的相关研究结论,可以帮助加强对弹幕不文明语言行为的监控,更好地服务于网络舆情监测工作。[方法/过程]基于使用频率较高的不文明词语及其分布的1492个弹幕视频的相关变量,通过构建回归模型分析不文明词语分布的影响因素。[结果/结论]官方账号中的不文明词语总体使用和负向使用概率较高,娱乐、科技、知识、国创、生活主题中的不文明词语出现率较高,视频时长、传播参与度、传播深度对不文明词语分布具有显著的影响。

面向航天器大数据安全传输的发布/订阅系统设计

针对航天器试验任务过程监控的在轨故障诊断状态检测、健康状态评估与航天器寿命预测等多个环节中,海量试验数据在传输、共享、处理、分析、存储等过程中面临的巨大压力,构建面向航天器多源异构数据管理的分布式大数据发布/订阅系统(big-data publish/subscribe system,BPSS)框架。借助大数据与云平台技术,设计了一套航天器海量在轨试验数据传输、管理与缓存方案,对云节点实现主从调控与弹性扩容,并通过基于消息一致性的动态选举算法完成大规模发布/订阅任务,保证数据传输的安全性、一致性与计算效率,具备大数据订阅响应迅速、多源异构数据高吞吐稳定性、分布式组件部署灵活等优点。实地航天器数管实验结果表明,BPSS数据订阅的平均响应时延为0.05 s/GB,同时在单日吞吐量达到85 GB量级时,数据丢帧率控制在0.025%、数据破损率控制在0.018%,与其他开源的发布/订阅系统相比具备一定竞争力。

基于联合树的高维数据本地化差分隐私保护算法

为解决发布高维数据过程中复杂的属性关联问题并避免中心服务器不可信任的问题,提出一种基于联合树的高维数据本地化差分隐私保护算法(JT-LDP算法)。基于不可信的中心服务器实现对用户数据的本地化差分隐私保护,中心服务器接收到用户本地化差分隐私保护的数据后,基于联合树算法识别高维数据的属性相关性,将高维数据属性集分割成多个独立的低维属性集。通过采样合成新的数据集进行发布。实验结果表明,JT-LDP算法在高维数据情况下具有更高的精度。

基于时序数据库与发布订阅机制的环境试验数据处理平台

针对航天领域技术进步及型号任务激增导致的环境试验数据种类与规模庞大、数据源分散,数据处理软件开发耗时且风格不统一,因而不同型号之间环境试验数据难以统一管理、数据处理功能分散的问题,开发了基于时序数据库与发布订阅机制的环境试验数据处理平台。该平台利用时序数据库对分散的海量环境试验数据进行统一存储与管理,实现了大规模数据的高效写入与访问;通过发布订阅机制实现了实时数据的快速展示;通过综合汇总不同型号对数据处理的需求,实现了环境试验数据通用化解析、数据处理与判读、文本导出和报告生成等多种业务功能。最后对环境试验数据处理平台的实施效果进行展示,证明了其具备良好的工程实用性。

“出版”概念演进述评——兼议出版的文化主体性

简要回顾近代“出版”概念自日本引入我国的过程,对比中、日、英、美等国的概念差异。梳理“出版”概念内涵及外延在我国的三个发展阶段,提出概念演进是实践发展的结果,呈现反映产业化趋势、弱化技术属性、强化思想文化属性的特征。对比中西方的“出版”概念内涵,从马克思哲学观点出发,提出当前“出版”概念内涵的显著特征是文化主体性,表现在文化选择、文化加工、文化创新和文化交流等方面。指出编辑环节是出版工作的中心环节,编辑人员是文化主体性的主要贡献者。

基于LCM的分布式嵌入式消息通信中间件设计

为了满足工业控制计算机在野外作业装备的分布式嵌入式系统任务迁移需求,设计了一种网络通信中间件方案。基于LCM的发布订阅模式框架以及中心节点的消息通信中间件,从而强化了LCMLite的多线程处理能力和消息通信中间件功能。该中间件能够促进任务迁移过程中各参与方之间的互动流程,并解决应用任务迁移后的网络通信续接和消息丢失问题。据测试结果,对于需要处理大量消息流量的场景,该网络通信中间件在消息传输方面的时间消耗非常少。

Mort:面向实时数据分发和传输优化的依赖性任务卸载框架

在边缘协同计算中,单一设备已无法满足大量复杂任务对系统高计算能力和低时延的需求,通常需要将任务卸载到邻近具有丰富计算存储资源的边缘服务器上,同时,通过发布订阅模式构建统一的通信协议,支撑任务对数据共享和隐私保护的需求.在发布订阅系统中,任务往往具有依赖性、执行周期性和高频率数据分发等特性,而传统的任务卸载算法主要针对数据单次传输和任务单次执行的场景,无法有效应对发布订阅系统中的任务卸载问题.因此,设计一个任务卸载及管理框架Mort.该框架使用基于静态代码分析的任务分解方法解构任务之间的依赖性,支撑任务并行;采用基于非线性整数规划建模和基于分组及资源融合的卸载算法,优化网络数据传输;采用基于协程的调度模型调度卸载后的任务,减少任务调度开销.大量的仿真实验和真实场景实验表明,Mort的数据传输优化能达到最优解的80%~90%,且引入的系统开销仅约为2%.