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%.

Baishideng's century goal:Editing and publishing high-quality articles

Baishideng's goal over the next few years is to edit and publish high-quality articles through the open-access model, to maximize the benefits to members of the editorial board, authors and readers, as well as achieving social and economic benefits.

Maternal Mortality: A Matter of Public Health Policies

Maternal mortality is a worldwide problem and concern, continuing to be a public health problem, the ratio of the same has been decreasing but still to those recommended by the World Health Organization. Objective: To perform a literature review, highlighting current aspects of maternal mortality. Method: The research was carried out in electronic databases Lilacs, Bireme-BVS, Scielo and BDENF, limited to the last 23 years. Those addressed pre-defined aspects of interest to the study proposal were selected—maternal mortality, public health policies, and the new approaches to the problem. Results: Maternal death is directly related to the living conditions of the population, showing variability from country to country (developed and developing), but its decrease is inherent to public policies and political will.

Implementing Open Access Policy:First case studies

When implementing open access, policy pioneers and flagship institutions alike have faced considerable challenges in meeting their own aims and achieving a recognized success. Legitimate authority, sufficient resources and the right timing are crucial, but the professionals charged with implementing policy still need several years to accomplish significant progress. This study defines a methodological standard for evaluating the first generation of open access policies. Evaluating implementation establishes evidence, enables reflection, and may foster the emergence of a second generation of open access policies.While the study is based on a small number of cases, these case studies cover most of the pioneer institutions, present the most significant issues and offer an international overview.Each case is reconstructed individually on the basis of public documents and background information, and supported by interviews with professionals responsible for open access implementation. This article presents the highlights from each case study. The results are utilized to indicate how a second generation of policies might define open access as a key component of digital research infrastructures that provide inputs and outputs for research,teaching and learning in real time.

我国出版政策研究的科学知识图谱分析

为实现新发展阶段出版业数字化转型及高质量发展,有必要对出版政策研究进行系统梳理,奠定完善出版政策的理论基础。利用CiteSpace绘制研究图谱,结合文献阅读与内容分析法,挖掘出版政策研究的期刊分布、高产作者、研究机构及其合作关系,根据关键词共现及聚类分析出版政策研究的热点,并探寻未来的研究态势。研究发现,2000—2023年,研究者们遵循政策是否能够解决问题,达成政策目标的逻辑思路,对具体类型的出版产业政策进行了政策效果的检视及优化路径的探寻,由此形成了包括“数字出版”“数据出版”“融合发展”等为主题的出版政策研究热点及研究前沿。结合我国出版业发展的时代背景及现实状况,技术与出版融合发展、科研数据共享背景下的数据期刊出版政策、中国出版“走出去”的数字化及本土化的政策设计等,是今后出版政策研究的主要方向及趋势。

学术出版中的人工智能应用伦理治理框架与措施——基于49项国际出版政策的扎根研究

人工智能深度介入学术出版全流程,深刻影响了当前的学术交流系统,掌握国际学术出版中人工智能的伦理治理框架和具体措施,可为我国学术期刊建设提供经验借鉴。文章采用扎根理论和内容分析法对有关人工智能应用的政策文本展开实证研究,分析当前国际学术出版流程中人工智能应用的伦理政策框架和主要规制措施。研究发现,国际学术出版机构对人工智能的应用持基本肯定态度,但仍保持谨慎的政策原则,其伦理治理框架分为包容审慎的处置原则和针对不同利益主体的具体规范两部分,导向清晰,措施明确。

2023:A year of accomplishments for the 13 Science Citation Index Expanded-and Emerging Sources Citation Index-indexed Baishideng journals

In 2023,Baishideng Publishing Group(Baishideng)routinely published 47 openaccess journals,including 46 English-language journals and 1 Chinese-language journal.Our successes were accomplished through the collective dedicated efforts of Baishideng staffs,Editorial Board Members,and Peer Reviewers.Among these 47 Baishideng journals,7 are included in the Science Citation Index Expanded(SCIE)and 6 in the Emerging Sources Citation Index(ESCI).With the support of Baishideng authors,company staffs,Editorial Board Members,and Peer Reviewers,the publication work of 2023 is about to be successfully completed.This editorial summarizes the 2023 activities and accomplishments of the 13 SCIEand ESCI-indexed Baishideng journals,outlines the Baishideng publishing policy changes and additions made this year,and highlights the unique advantages of Baishideng journals.

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。

人民文学出版社出版方针的形成与出版格局的奠定

“古今中外,提高为主”是人民文学出版社成立之初由冯雪峰提出、沿用至今的出版方针。这个出版方针与新中国文艺“普及为主”的发展方向和人民文学出版社成立时“以普及为第一位”的任务要求是不甚相符的。“古今中外,提高为主”的出版方针源于冯雪峰对人民文学出版的定位,但更重要的是源于冯雪峰对艺术大众化、中国古典文学、“五四”新文学、外国文学和新中国成立后的新创作的态度和观念。冯雪峰还根据这一方针起草了出版规划,开启了人民文学出版的重点工作。随后,楼适夷、王任叔等在担任社领导期间,规划丛书出版,制订选题计划,编制“五年出版规划”,最终奠定了人民文学出版社的基本出版格局,推动了人民文学出版社朝向“全国文学出版的中心”发展。

中国科技期刊卓越行动计划带动的科技期刊研究热点分析

梳理并分析中国科技期刊卓越行动计划带动的科技期刊研究热点话题,为进一步打造世界一流科技期刊提供借鉴。文章以知网收录的2019—2023年发表的379篇相关论文为样本文献,使用文献计量可视化与内容分析相结合的方法,开展文献研究热点话题分析。发现相关论文的研究热点话题集中在编辑出版政策、办刊策略与集群化、媒体融合与宣传推广、编辑人才培养四个方面。提出我国科技期刊出版界要加强学术出版伦理规范研究;继续加快培育高水平科技期刊,自主孵化一流期刊;持续推进期刊集群化发展和自主出版平台建设,提升出版服务能力;完善多元立体化的期刊宣传推广新媒体矩阵建设,实现可持续运营;加强复合型编辑人才培养。