纸媒发展遭遇“难题” 小论“破题”之路

随着新一轮信息技术革命的到来，传统媒体尤其是纸媒面临着生死抉择，市场份额持续被“新兴势力”吞噬，人才外流情况严重，传统纸媒发展遭遇前所未有的“难题”。正如《21世纪经济报道》创始人刘洲伟而言“我们还年轻，报纸却老了!”分析传统纸媒衰落原因，笔者认为包含“三个老了”，首先读者老了；其次纸媒的传播方式老了；最后媒体人做事的思路也老了。正因为跟不上潮流，传统纸媒发展开始步履蹒跚。就传统纸媒的现状，要么转型、要么等死，这几乎没有第三条路可行。对于传统纸媒转型，在笔者来看，纸媒触网乃大势所趋，触网不代表放弃纸媒自身优势裸身投靠互联网，而是保持“内容为王”的优势前提下有机融合，借力于网络、新媒体的思路、平台、视野，取长补短，为传统纸媒注入新的血液。

A P2P streaming service architecture with distributed caching

Multimedia streaming served through peer-to-peer (P2P) networks is booming nowadays. However, the end-to-end streaming quality is generally unstable due to the variability of the state of serve-peers. On the other hand, proxy caching is a bandwidth-efficient scheme for streaming over the Internet, whereas it is a substantially expensive method needing dedicated powerful proxy servers. In this paper, we present a P2P cooperative streaming architecture combined with the advantages of both P2P networks and multimedia proxy caching techniques to improve the streaming quality of participating clients. In this frame- work, a client will simultaneously retrieve contents from the server and other peers that have viewed and cached the same title before. In the meantime, the client will also selectively cache the aggregated video content so as to serve still future clients. The associate protocol to facilitate the multi-path streaming and a distributed utility-based partial caching scheme are detailedly dis- cussed. We demonstrate the effectiveness of this proposed architecture through extensive simulation experiments on large, Inter- net-like topologies.

Understanding pollution dynamics in large-scale peer-to-peer IPTV system

With the great commercial success of several IPTV (internet protocal television) applications, PPLive has received more and more attention from both industry and academia. At present, PPLive system is one of the most popular instances of IPTV applications which attract a large number of users across the globe; however, the dramatic rise in popularity makes it more likely to become a vulnerable target. The main contribution of this work is twofold. Firstly, a dedicated distributed crawler system was proposed and its crawling performance was analyzed, which was used to evaluate the impact of pollution attack in P2P live streaming system. The measurement results reveal that the crawler system with distributed architecture could capture PPLive overlay snapshots with more efficient way than previous crawlers. To the best of our knowledge, our study work is the first to employ distributed architecture idea to design crawler system and discuss the crawling performance of capturing accurate overlay snapshots for P2P live streaming system. Secondly, a feasible and effective pollution architecture was proposed to deploy content pollution attack in a real-world P2P live streaming system called PPLive, and deeply evaluate the impact of pollution attack from following five aspects:dynamic evolution of participating users, user lifetime characteristics, user connectivity-performance, dynamic evolution of uploading polluted chunks and dynamic evolution of pollution ratio. Specifically, the experiment results show that a single polluter is capable of compromising all the system and its destructiveness is severe.

A Cloud-Assisted Malware Detection and Suppression Framework for Wireless Multimedia System in IoT Based on Dynamic Differential Game

As a novel dynamic network service infrastructure, Internet of Things （IoT） has gained remarkable popularity with obvious su- periorities in the interoperability and real-time communication. Despite of the convenience in collecting information to provide the decision basis for the users, the vulnerability of embed- ded sensor nodes in multimedia devices makes the malware propagation a growing serious problem, which would harm the security of devices and their users financially and physi- cally in wireless multimedia system （WMS）. Therefore, many researches related to the mal- ware propagation and suppression have been proposed to protect the topology and system security of wireless multimedia network. In these studies, the epidemic model is of great significance to the analysis of malware prop- agation. Considering the cloud and state tran- sition of sensor nodes, a cloud-assisted model for malware detection and the dynamic differ- ential game against malware propagation are proposed in this paper. Firstly, a SVM based malware detection model is constructed with the data sharing at the security platform in the cloud. Then the number of malware-infected nodes with physical infectivity to susceptible nodes is calculated precisely based on the at- tributes of WMS transmission. Then the statetransition among WMS the modified epidemic devices is defined by model. Furthermore, a dynamic differential game and target cost function are successively derived for the Nash equilibrium between malware and WMS sys- tem. On this basis, a saddle-point malware de- tection and suppression algorithm is presented depending on the modified epidemic model and the computation of optimal strategies. Nu- merical results and comparisons show that the proposed algorithm can increase the utility of WMS efficiently and effectively.

ICN Based Vehicle-to-Cloud Delivery for Multimedia Streaming in Urban Vehicular Networks

Mobile multimedia streaming is an open topic in vehicular environment. Due to the high intermittent links, it has become a critical challenge to deliver high quality video streaming in vehicular networks. In this paper, we reform the Information Centric Networking （ICN） concept for multimedia delivery in urban vehicular networks. By leveraging the 1CN perspective, we highlight that vehicular peers can obtain multimedia chunks via the vehicle-to-cloud （V2C） approach to improve the delivery quality. Based on this, we propose a lightweight multipath selection strategy to guide the network system to adaptively adjust the forwarding means. Extensive simulations show that the proposed solution can optimize the utilization of network paths, lighten network loads as well as avoid wasting resources.

Fusion of modem information and English teaching technology under constructivist theory background

The rapid development of multimedia network technology, multimedia teaching English provides a technology platform. The constructivist theory and modern information technology are two pivot multimedia teaching system. Only to unite the two together as one, it can form a reasonable and effective teaching system. Accordingly, this paper discusses the theory of multimedia teaching, design and multimedia network technology of a modem information technology education in English teaching and other related issues.

A brief study of ＂new media＂ on the ethical problems and countermeasures

Modern media technology on the dramatic changes that took place in the context of globalization, new media also came in- to being. Its scope, mainly related to blogs, wikis, micro-blogging, micro-letter network, media NET, driving NET, computer networks, mobile text messaging, mobile TV, digital TV, touch-sensitive media and other free collections of a range of media production and timely dissemination of information. This article will explain the features of the new medium, unlike traditional media, characteristics of new me- dia, new media, moral perspective, combines technical, ethical and management in exploring the three causes of relevant ethical issues. The related ethical issues have been on public morals and social ethics of media brought new challenges. Looking for ethical issues related to new media strategy, new media system of ethics and oversight mechanisms, strengthen self-discipline and new media new media profes- sional philosophy and moral consciousness is now the important issues we face.

Research on Teaching Model of Computer English

Because of the rapid development of computer, new term about IT is emerging. Such new IT mostly comes from foreign countries and the technical manuals about how to learn such new IT and how to use its latest development tools in English. In this paper, combined with previous teaching experience and the development of a large number of networked multimedia, a preliminary study carried out on the interactive network multimedia education platform design patterns, the overall structure and system solutions. As the study is only a tentative teaching experiment based on the collaborative teaching mode, necessary improvement and modification are needed in other teaching practice. According to the curriculum characteristics and teaching situation of computer professional English, propose some teaching innovation scheme in terms of teaching contents and teaching methods, and combine computer professional English with computer professional courses to strengthen student application ability and improve teaching quality effectively.

Study on the Application of Aesthetic Ideas to Micro-film Advertising

Micro-film is a product from the development of mobile media technology based on the network media, and the short and typical screen expression ability and effect are its forms of contents. Different from the communication way of traditional advertising, micro-film advertising has the characteristics of both social networking and video communication. With the creative characteristics of micro-film advertising, the conamunication way of video advertising has been started. In this paper, through the introduction to the advantages of micro-film advertising communication and combining with the development of micro-film in the new period, the application of aesthetic ideas to micro-film advertising is further explored, and then the striking expression effect caused by micro-film advertising is introduced.

On Practice and Exploration of College English Multimedia Network Teaching in China

With the development of the times, modem education technology constantly emerges, and modern college English classroom begins to tend to use multimedia network for teaching. One is that multimedia network teaching can enrich English teaching content. Two is that multimedia network teaching can make teaching process become full ofvigour, highlighting the dominant position of students in the classroom. Three, multimedia network teaching is conducive to improving the comprehensive quality of English teachers. In view of this, university English teaching should positively introduce multimedia network technology in teaching process, in order to promote English teaching quality to obtain great improvement.

On Practice and Exploration of College English Multimedia Network Teaching in China

With the development of the times, modem education technology constantly emerges, and modern college English classroom begins to tend to use multimedia network for teaching. One is that multimedia network teaching can enrich English teaching content. Two is that multimedia network teaching can make teaching process become full of vigour, highlighting the dominant position of students in the classroom. Three, multimedia network teaching is conducive to improving the comprehensive quality of English teachers. In view of this, university English teaching should positively introduce multimedia network technology in teaching process, in order to promote English teaching quality to obtain great improvement.