Core-based Shared Tree Multicast Routing Algorithms for LEO Satellite IP Networks

A new core-based shared tree algorithm, viz core-cluster combination-based shared tree （CCST） algorithm and the weighted version （i.e. w-CCST algorithm） are proposed in order to resolve the channel resources waste problem in typical source-based multicast routing algorithms in low earth orbit （LEO） satellite IP networks. The CCST algorithm includes the dynamic approximate center （DAC） core selection method and the core-cluster combination multicast route construction scheme. Without complicated onboard computation, the DAC method is uniquely developed for highly dynamic networks of periodical and regular movement. The core-cluster combination method takes core node as the initial core-cluster, and expands it stepwise to construct an entire multicast tree at the lowest tree cost by a shortest path scheme between the newly-generated core-cluster and surplus group members, which results in great bandwidth utilization. Moreover, the w-CCST algorithm is able to strike a balance between performance of tree cost and that of end-to-end propagation delay by adjusting the weighted factor to meet strict end-to-end delay requirements of some real-time multicast services at the expense of a slight increase in tree cost. Finally, performance comparison is conducted between the proposed algorithms and typical algorithms in LEO satellite IP networks. Simulation results show that the CCST algorithm significantly decreases the average tree cost against to the others, and also the average end-to-end propagation delay ofw-CCST algorithm is lower than that of the CCST algorithm.

Novel optimized routing algorithm for LEO satellite IP networks

A lot of routing algorithms have been proposed for low earth orbit（LEO） satellite IP networks in recent years,but most of them cannot achieve global optimization.The dynamic characters of LEO satellite networks are reflected in two aspects：topology and traffic change.The algorithms mentioned above are ＂hard routing＂ which only realize local optimization.A distributed soft routing algorithm combined with multi-agent system（MASSR） is proposed.In MASSR,mobile agents are used to gather routing information actively,and blackboard is introduced to achieve direct information exchange between agents.MASSR provides traffic adaptive routing and tracks the change of LEO satellite network topology.The performance of ant colony optimization（ACO） and MASSR are compared in Iridium constellation,and MASSR presents better end-to-end delay as well as enhanced robustness.

A FUZZY-LOGIC CONTROL ALGORITHM FOR ACTIVE QUEUE MANAGEMENT IN IP NETWORKS

Active Queue Management (AQM) is an active research area in the Internet community. Random Early Detection (RED) is a typical AQM algorithm, but it is known that it is difficult to configure its parameters and its average queue length is closely related to the load level. This paper proposes an effective fuzzy congestion control algorithm based on fuzzy logic which uses the pre- dominance of fuzzy logic to deal with uncertain events. The main advantage of this new congestion control algorithm is that it discards the packet dropping mechanism of RED, and calculates packet loss according to a preconfigured fuzzy logic by using the queue length and the buffer usage ratio. Theo- retical analysis and Network Simulator (NS) simulation results show that the proposed algorithm achieves more throughput and more stable queue length than traditional schemes. It really improves a router's ability in network congestion control in IP network.

Design and verification of a satellite-terrestrial integrated IP network model for the Global Energy Interconnection

In order to meet the pressing demand for wide-area communication required by the Global Energy Interconnection(GEI),accelerating the construction of satellite-terrestrial Integra怕d networks that can achieve network extension and seamless global coverage has become the focus of power communication tech no logy development.In this study,we propose a satellite-terrestrial integrated network model that can support interconnection and interoperation on the IP layer between the satellite system and the怕rrestrial segment of the existing power communication system.First,the composition and function of the satellite-terrestrial collaborative network are explained.Then,the IP-based protocol stack is described,and a typical applicati on experime nt is con ducted to illustrate the particular process of this protocol stack.Fin ally,a use case of IP interconn ection that depends on GEO satellite communication is detailed.The experime ntal study has showed that the satellite-terrestrial collaborative network can efficiently support various IP applications for the GEI.

A WIRELESS MULTIMEDIA TRANSMISSION CONTROL AlGORITHM OVER HETEROGENEOUS IP NETWORKS

In this paper,an algorithm Wireless Multimedia Transmission Control(WMTC) is proposed for multimedia transmission control over wired-wireless networks.The relationship between packet length and packet loss rate in the Gilbert wireless error model is investigated.Furthermore,the algorithm can detect the nature of packet losses by sending large and small packets alternately,and control the sending rate of nodes.In addition,by means of updating factor K,this algorithm can adapt to the changes of network states quickly.Compared with previous algorithms,simulation results show that WMTC can both improve the networks throughput of multimedia transmissions and reduce the congestion loss rate in various situations.

Research on the Method of Implementing Named Data Network Interconnection Based on IP Network

In order to extend the application scope of NDN and realize the transmission of different NDNs across IP networks,a method for interconnecting NDN networks distributed in different areas with IP networks is proposed.Firstly,the NDN data resource is located by means of the DNS mechanism,and the gateway IP address of the NDN network where the data resource is located is found.Then,the transmission between different NDNs across the IP network is implemented based on the tunnel technology.In addition,in order to achieve efficient and fast NDN data forwarding,we have added a small number of NDN service nodes in the IP network,and proposed an adaptive probabilistic forwarding strategy and a link cost function-based forwarding strategy to make NDN data obtaining the cache service provided by the NDN service node as much as possible.The results of analysis and simulation experiments show that,the interconnectionmethod of NDN across IP network proposed is generally effective and feasible,and the link cost function forwarding strategy is better than the adaptive probability forwarding strategy.

基于身份认证的BACnet/IP分析与改进

为了解决BACnet/IP身份认证存在多种可攻击漏洞和密钥泄露带来的安全问题,提出了一种安全增强的BACnet/IP-SA协议认证方案。研究协议身份认证消息流模型,基于着色Petri网理论和CPNTools对身份认证消息流建模,采用Dolev-Yao攻击者模型和形式化分析方法对BACnet/IP进行安全性分析,发现协议漏洞并提出改进方案。BACnet/IP-SA协议使用设备的伪身份来保护真实身份信息,使用PUF响应进行认证,通过多信息集合的验证值来验证端身份的真实性并生成会话密钥。结合BAN逻辑和非形式化方法,对协议的安全性进行了证明。实验结果表明,所提方案能有效抵抗多类攻击和密钥泄露带来的安全威胁,在减少计算开销的同时增强了协议身份认证的安全性。

基于VTS的BACnet/IP虚拟设备的实现

基于BACnet/IP网络在智能楼宇系统中的应用现状,阐述了对其网络设备数据进行模拟的作用与意义。使用Wireshark/Tshark作为工具,归纳了监听BACnet设备通信数据的一般步骤,以及从中筛选出必要信息的过程。随后根据获取的设备信息数据,提出了一种在VTS中将其虚拟化的方案。最后通过实践验证了该模拟设备方案的有效性。

IP属地化政策对舆情评论的影响研究——基于微博用户属地公开的准自然实验

[目的/意义]实证评估公开属地政策能否以及如何对舆情评论产生影响,为网络舆情研究、平台优化和治理提供启示。[研究设计/方法]基于自我监控理论和隐私计算理论构建研究模型和假设,以微博“IP属地”功能的推出为准自然实验,运用双重差分法和断点回归模型探究IP属地化政策对舆情评论的影响。[结论/发现]政策引发用户自我监控效应和风险感知效应,不仅整体改善了评论情感倾向、评论可读性和共情性,也能够显著抑制评论情感极性,该结论在一系列稳健性检验后仍然成立。政策影响在不同用户群体之间存在显著差异,相较处于事件热点中心的用户,属地公开更能促使处于非热点中心的用户做出改变。政策同时加剧评论中的地域歧视现象。[创新/价值]揭示了IP属地化政策对在线评论行为的作用,为清朗网络环境提供新视角,丰富了IP属地化与舆情评论行为影响因素的相关研究。

基于移情设计理念下的秦岭生态旅游IP形象设计研究

为了促进秦岭生态文化保护及旅游业的发展,针对目前文创产品的发展现状及不足之处,以移情理念为视角,提出有效设计策略,为秦岭生态文化的传承与发展提供新的思路。根据调研和受众问题反馈,将移情设计理念引入文创IP设计,归纳设计流程为“观察-互动-感知”3个阶段,从视觉、交互、情感等层面系统性梳理秦岭文创产品移情输出设计流程。提取秦岭生态地域形态、色彩与文化语义等设计要素,明晰设计要点,以秦岭四宝IP文创及衍生设计为例,进行秦岭四宝文创IP的视觉形象设计。通过移情设计对秦岭生态元素分析与整理,能够有效契合受众的情感需求,将优秀的文化元素及情感映射到IP设计本身,为受众赋予秦岭生态文化旅游设计形态与色彩,提升文化价值促进秦岭生态文化的发展与保护。

数智化背景下IP出版的创新发展与实践路径

IP具有品牌性、开放性与广泛的受众基础,能够将文化资源转化为品牌价值。数智化转型背景下,出版业价值转向知识服务,用户导向与技术融合形成出版新趋势。借势数智技术,IP出版能够实现创新发展:产品形态创新主要呈现从产品到服务、从实体到虚拟趋势的转变;叙事方式创新能够实现沉浸式体验与个性化设计;传播方式创新能够实现价值共创,塑造文化认同。IP出版应平衡经济价值与文化价值,推动本土文化走出去,激活传统文化价值,扩大流行文化影响力,发挥凝结人类文明成果、传播知识的重要作用,承担起文化传承与现代化发展的时代重任。

文化创意产业导向下的图书馆文创IP数据库构建研究——以《上海图书馆文创IP资源库》为例

本研究以文化创意产业的发展为导向,以上海图书馆构建的《上海图书馆文创IP资源库》为例,对图书馆文创IP数据库的构建进行深入研究。通过对《上海图书馆文创IP资源库》的调研和分析,探讨图书馆如何利用数字技术和文化资源,构建和管理具有创意价值的IP数据库,并借此为文化创意产业提供丰富的创意资源,推动文化产业的创新与发展,为图书馆文创开发的进一步发展带来新的思路和机遇。

数字时代传统文化经典再IP化的趋势特征与多元动力

传统文化经典在数字时代的传承与创新,呈现出再IP化的趋势。传统文化经典再IP化,是传统经典依托数字技术的再创造,它以知识产权为核心支撑,并且在介质、感知、功能和运营等维度呈现出跨界融合的趋势特性。传统文化经典再IP化受到多重力量的共同驱动,具体体现为宏观层面的文化安全、文化本体层面的传承需求、科技创新层面的“双向赋能”,以及受众群体层面的代际转换等。但是,传统文化经典再IP化不是简单地将经典的场景予以数字化呈现,而具有一套以观念旨向、业态创新和场景饱和为要素构成的“三位一体”结构体系。

短视频IP“民乐也疯狂”的价值共创与国际传播

经典民乐既是了解、认识传统文化的鲜活素材,也是讲好中国故事的一个重要手段。面对新的文化环境,短视频“民乐也疯狂”以创作精品内容为基础,以满足受众需求为目标,选择与“Z世代”受众习惯相契合的传播平台,通过打造知名IP,为我国传统文化“走出去”提供了新路径。本文通过分析短视频IP“民乐也疯狂”的价值共创逻辑和国际传播策略,为传统文化国际传播提供可借鉴的经验。

网络文学IP影视化中的原著粉迁移——基于“理想类型”视角的个案叙事

网络文学作为依托于互联网时代而产生的新型人民文艺形态,在媒介融合时代表现出了巨大的IP开发价值,成为影视等产品最大的内容输送库。其中,原著粉是网络文学IP跨界的见证者。由于原著粉对网络文学IP的情感认同和价值感知不同,在网络文学IP影视化过程中表现为理性成瘾、自我说服、精益求精三种情况。基于此,从四个方面给出网络文学IP跨媒介延伸的优化建议:一是尊重改编规律,延续IP人气;二是横向条件关联,增强IP价值;三是纵向跨界延伸,深耕IP产业;四是多维制度保障,赋能IP开发。

椅旁IPS e.max CAD高嵌体修复后牙缺损的临床效果探析

目的为评价CEREC椅旁CAD/CAM系统制作的IPS e.max CAD玻璃陶瓷高嵌体应用于根管治疗后牙缺损病例的临床效果。方法选择42例根管治疗后牙,应用高嵌体的牙体预备方式,采用CEREC椅旁CAD/CAM修复系统和IPS e.max CAD玻璃陶瓷,即刻完成修复体并粘接;修复1年后复查,参照改良修正后的美国公众健康服务标准(US Public Health Service Criteria,USPHS),在修复体边缘染色、边缘继发龋、修复体边缘适合性、修复体崩瓷折裂或脱落、修复体颜色、牙龈健康状况、修复体邻接关系、患者满意度8个方面进行评价。结果修复体边缘染色C级病例1例,成功率97.6%;边缘继发龋C级病例1例,成功率97.6%;修复体邻接关系欠佳C级病例1例,成功率97.6%;在边缘适合性、修复体崩瓷折裂或脱落、修复体颜色、牙龈健康状况、患者满意方面表现优秀,成功率均为100%。结论椅旁CAD/CAM系统制作的IPS e.maxCAD高嵌体修复体在短期内可取得良好的修复效果。

基于品牌内涵传达的湖北省博物馆IP文创日用产品开发策略研究

就湖北省博物馆IP文创日用产品开发,对博物馆品牌内涵的传达现状和问题点展开分析,提出明确色彩体系规划、提升产品体验趣味性以及多途径实现品牌价值来强化品牌内涵传达效果的策略和方案,为省博IP文创日用产品开发提供参考。

浅析手游IP计中的应用研究

本文从手游IP在新式茶饮联名设计中的现状入手,分析手游IP在新式茶饮联名设计中的应用基础,对手游IP在新式茶饮联名设计中的应用规则进行细致的阐述,旨在更好地了解手游IP在新式茶饮联名设计中的未来发展趋势,认清IP联名的现状,归纳与总结IP联名的缺憾,实现跨圈双赢。

动漫影视IP对外传播的联动效应与优化路径——基于CsQCA的组态分析

动漫影视通过其独特的艺术风格传播中国文化形象和价值观,成为中华文化出海的新名片。典型的条件组合模式包括:内容体、文化体与人格体要素共同解释,内容体与文化体要素共同解释以及文化体要素独立解释。传播体、内容体、文化体“多重并发”,形成驱动出海国产动漫影视成为超级IP的多样化组态。动漫影视IP在对外传播中需要糅合传统经典与公共议题,创新叙事范式,实现IP双向对话,进而跨界开发衍生产品,增强其传播力和影响力。

“粤字号”农产品品牌IP形象设计与叙事策略研究

目的本文以叙事理论为指导,针对“粤字号”农业品牌IP形象设计研究,旨在探索新时代下叙事策略在农业品牌IP形象设计中的方法,为我国农业品牌建设提供新的思路。方法首先,概述了叙事理论的基本概念,分析了“粤字号”农业品牌的发展现状和存在的问题;其次,通过品牌叙事的逻辑,探讨了叙事理论在品牌IP形象设计中的应用方法;最后,通过西关香香IP形象元素的设计实践,总结了“粤字号”农业品牌IP形象的叙事策略。结果通过叙事逻辑的分析,在“粤字号”农业品牌的实践中找到了叙事的核心价值,并通过叙事表达和叙事传播完成了叙事的心理认知。结论品牌叙事从品牌文化、品牌形象和品牌传播等方面形成品牌认知的逻辑关系,为“粤字号”农业品牌IP形象设计提供了系统的方法论,对农业品牌IP形象设计的故事进行挖掘,提升消费者对品牌IP形象的体验感和认知度,提高“粤字号”农产品品牌的市场价值,为农业品牌IP设计提供了有价值的参考。