共查询到20条相似文献,搜索用时 15 毫秒
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改革开放以来,中国政府采取了一系列优先发展中间扶持的政策,使信息通信产业能够实现连续20多年的高速增长。特别是近几年,新增的电话用户每年超过9000万以上,固定电话已经超过了3亿。互联网用户超过1亿,宽带用户超过了2000万。与此同时,制造业也取得了很大的进步。信息产业是当今发展最快、最有活力,与世界经济生活密切相关的产业之一。它为公共生活带来许多方便和服务。右图是中国电话用户的增长过程。 相似文献
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Recent rapid rise of indoor location based services for smartphones has further increased the importance of precise localization of Wi-Fi Access Point(AP).However,most existing AP localization algorithms either exhibit high errors or need specialized hardware in practical scenarios.In this paper,we propose a novel RSSI gradient-based AP localization algorithm.It consists of the following three major steps:firstly,it uses the local received signal strength variations to estimate the direction(minus gradient) of AP,then employs a direction clustering method to identify and filter measurement outliers,and finally adopts triangulation method to localize AP with the selected gradient directions.Experimental results demonstrate that the average localization error of our proposed algorithm is less than 2meters,far outperforming that of the weighted centroid approach. 相似文献
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Forwarding is a major means of information dissemination on the Microblog platform.The article,combining static analysis and dynamic analysis,takes Microblog forwarding as the object of study,and studies the network topology of grass-roots Microblog forwarding users.It also studies the correlation between characteristic quantity and forwarding times of Microblog network topology.Furthermore,it conducts modification on virus transmission model,builds and verifies the Microblog forwarding dynamical model.The study finds out that Microblog postings present qute strong dissemination capacity on the initial stage,and some Microblog postings with many forwarding times and long duration of forwarding process due to the dynamic growth of the forwarding user network and the joining of strong nodes make network infection density decrease in some phases. 相似文献
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空中交通管理作为我国的民航运输发展中重要的构成部分,是决定民航运输综合服务水平和运行效率的关键要素.文章对基于管制运行关键指标的管制质量评估重要性进行了探讨,结合管制运行关键指标分析,提出了优化管制质量相关策略. 相似文献
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从管制框架对VoIP的适用、基于VoIP提供的公共电子通信服务、基于VoIP提供的公共电话服务、对VoIP服务使用者及公共安全的保护以及互联、互用与号码的使用等方面论述了政盟的网络语音服务管制框架.从中可以看出欧盟对于新技术的态度和管制思路。欧盟对于VoIP服务的规定在一定程度上体现了其“技术中立”的管制思路,使于管制政策之间的一贯性和衔接。 相似文献
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通信技术正在迅速地变化,它将具有更高的性能,增加多种应用,并使用户得到更大的实惠.经营者和用户不断增长的需求和在开放市场上的竞争,都推动了技术的更新.为了实现这些变化,首先要在发展基础技术、网络体系结构和全球标准化方面取得不断的进展.本文将叙述通信技术将如何发展,以适应下一个世纪的新业务. 相似文献
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1德国数字未来战略德国是一个高技术国家,信息与通信技术(ICT)对各行各业的发展都起着决定性作用。今天,ICT产业本身的毛附加值已经超过了机械工程产业和汽车制造业。在就业方面,2009年ICT行业紧随机械工程行业之后,有846000个工作岗位。我们要更好地利用ICT在德国促进增长和就业的巨大潜力。在传统行业如能源、交通、保健、教育、休闲、旅游和管理领域采用现代ICT技术实现智能网络化,带给了我们新的机遇,同时也让我们面临新的挑战,特别是在数 相似文献
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刘尚文 《电子产品可靠性与环境试验》2008,26(6)
领域层面标准化动因研究的主要目的是解释领域标准的年形成量,分析领域特征对标准的需求,这与企业层面的动因研究是不一样的.通过理论分析,根据中国信息通信技术(ICT)产业各领域网络效应的强弱以及标准对ICT产业的影响,提出了领域标准化动因的理论假设,为相关研究提供理论分析依据. 相似文献
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一定规模的用户对某类项目的关注度是评价该类项目所属行业发展趋势的重要参数之一,是行业发展趋势研究的数据基础。针对当前研究对象数据源获取的局限性问题,设计并实现了一个数据获取与分析系统。该系统可以根据关键词获取GitHub上指定行业的项目数据,以项目数量、关键项目的星标数量、复刻数量和提问数量为依据对项目数量和关注度的变化进行多维度分析,利用百度ECharts实现数据可视化,为研究行业发展的整体趋势提供参考。 相似文献
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人们常说,如果现实世界不随人愿,就应该设法加以改变。所幸的是,现实世界中许多不随人愿之事——贫困、无知、饥饿——均可通过更好的通信得以改变。2003年12月出席在日内瓦举行的信息社会世 相似文献
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Trust management has been proven to be a useful technology for providing security service and as a consequence has been used in many applications such as P2P,Grid,ad hoc network and so on.However,few researches about trust mechanism for Internet of Things(IoT) could be found in the literature,though we argue that considerable necessity is held for applying trust mechanism to IoT.In this paper,we establish a formal trust management control mechanism based on architecture modeling of IoT.We decompose the IoT into three layers,which are sensor layer,core layer and application layer,from aspects of network composition of IoT.Each layer is controlled by trust management for special purpose:self-organized,affective routing and multi-service respectively.And the final decision-making is performed by service requester according to the collected trust information as well as requester' policy.Finally,we use a formal semantics-based and fuzzy set theory to realize all above trust mechanism,the result of which provides a general framework for the development of trust models of IoT. 相似文献
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正Amajor recent development in computer networking is the emergence of Software Defined Networking(SDN),whose goal is to provide a centralized,programmable control plane that is decoupled from the distributed data planes on individual network devices.In particular,the development of OpenFlow has demonstrated many potential benefits of SDN,and multiple vendors have started to offer commercial switches supporting the OpenFlow standard.Researchers have also made progress on SDN components including SDN controllers, 相似文献