基于不同节点移动模式的无线自组网路由协议性能分析

本文采用NS2网络仿真软件,随机建立包含100个节点的网络拓扑,在节点静止、缓慢移动和快速移动条件下,分别对AODV、DSR和DSDV三种路由协议的数据包端到端时延、抖动和吞吐量的变化趋势进行比较分析。仿真结果表明,在网络规模较大且网络拓扑变化不频繁的情况下,DSDV具有一定的优势;在网络规模较大且网络拓扑多变的情况下,AODV和DSR性能明显优于DSDV。     

基于现场总线技术的工业控制系统研究

现场总线是现代工业控制技术的发展方向,对于现场总线来说,其特点是现场通信、现场设备互联,具有较好的互操作性,并且功能模块分散化,同时具有开放式互联网等。本文通过对现场总线技术,以及通信协议进行仔细分析和研究,对几种常用的现场总线进行比较,说明了由其构成的工业控制系统的结构,最后针对CAN总线设计了一种工业控制系统并强调了在设计中所需注意的问题。     

中继终端设备的天地网关功能设计与性能测试

近年来,空间网络协议大力发展,CCSDS空间网络协议体系已成为事实上的标准。基于跟踪与数据中继卫星系统（TDRSS）地面站中低速中继终端设备进行相应改造,增加网关路由板卡,加载CCSDS空间传输协议软件,将原来的中低速中继终端设备改造成带有路由网关功能的中低速中继终端设备。在此基础上,采用两台增加路由网关功能的中低速中继终端设备以及信道模拟器搭建天地网络演示验证系统,并分别对采用TCP协议和PEP增强协议作为传输层协议的HTTP应用进行了性能分析比对,证明PEP增强协议更能适应天地网络传输。     

私有协议与标准化的知识产权政策

在对电信市场的网络效果、转换成本以及标准经济性质分析的基础上,本文探讨厂商在私有协议、产业标准化和机构标准化竞争中采取的知识产权政策。在ICT市场里,市场选择决定胜出的私有协议,厂商采取的基本策略是先松后紧的知识产权政策。产业联盟的厂商在产业标准化上既竞争又合作,他们都试图运用有效的知识产权政策和市场策略赢得标准谈判更大的筹码。在机构标准化竞赛中,厂商会采取适度温和的知识产权渗透政策和“脚踏两只船”的风险分散策略。中国厂商相应采取科学的知识产权政策对于赢得私有协议和标准化起着关键性作用。     

多媒体教学网络的组建

介绍了多媒体教学网络的组建方法 ,对网络的拓扑结构、网卡、网线的选取 ,网络的系统配置 ,网络的软硬件资源共享 ,网络打印机的使用等作了详细的论述。对学校组建多媒体教室有一定的参考价值。     

Consumer cynicism: Interdisciplinary hybrid review and research agenda

Over the years, consumers have been questioning the intentions and actions of firms, resulting in a cynical attitude and behaviour. Due to the severity of the outcomes that cynical consumers may display, reputed journals and prolific researchers have addressed the core issue in their own unique ways. However, no single study offers a uniform, comprehensive, and contemporary review of consumer cynicism literature. Thus, we use an interdisciplinary approach to study the literature spanning 47 years (1976–2022) on cynicism in consumer research, psychology, and organizational domains through a hybrid review involving bibliometric and systematic literature reviews. Following the SPAR-4-SLR protocol, this review shows the most cited and co-cited articles, researchers, and keywords in cynicism research. We infer that the consumer cynicism construct draws heavily from the organizational behaviour area, possessing the potential to be correlated with, and extended to interdisciplinary research. Also, we offer an all-inclusive model of the predictors and predictands of consumer cynicism based on the ADO-TCM framework. We close this study with its academic contributions, practical implications, and future research directions using the ADO-TCM framework.     

Trading under the proof-of-stake protocol – A continuous-time control approach

We develop a continuous-time control approach to optimal trading in a Proof-of-Stake (PoS) blockchain, formulated as a consumption-investment problem that aims to strike the optimal balance between a participant's (or agent's) utility from holding/trading stakes and utility from consumption. We present solutions via dynamic programming and the Hamilton–Jacobi–Bellman (HJB) equations. When the utility functions are linear or convex, we derive close-form solutions and show that the bang-bang strategy is optimal (i.e., always buy or sell at full capacity). Furthermore, we bring out the explicit connection between the rate of return in trading/holding stakes and the participant's risk-adjusted valuation of the stakes. In particular, we show when a participant is risk-neutral or risk-seeking, corresponding to the risk-adjusted valuation being a martingale or a sub-martingale, the optimal strategy must be to either buy all the time, sell all the time, or first buy then sell, and with both buying and selling executed at full capacity. We also propose a risk-control version of the consumption-investment problem; and for a special case, the “stake-parity” problem, we show a mean-reverting strategy is optimal.