浅谈流媒体技术在教学中的应用

本文简单介绍了流媒体技术和当前使用最为普遍的流媒体系统--Windows Media系统,最后给出一个流媒体技术在教学中应用的解决方案--交互式视频教学平台解决方案.     

Smart Instrumentation in Video Streams Using Real-time Bit-rate Adaptation

With the proliferation of video traffic across the Internet and wireless networks, various compression standards for videos have emerged over the past two decades. Among them, Motion Joint Photographic Expects Group (M-JPEG) offers the advantages of no frame-to-frame error propagation, less computation cost, and achieving a short latency in both encoding and decoding. However, the bit-rate of M-JPEG stream is variable due to its dynamic frame size, and that leads to adverse outcomes such as inducing different quality-of-service (QoS) grades from servers and networks and inducing disturbances in a real-time network environment. This paper proposes a novel approach that can control bit-rate and also the individual frame size of M-JPEG video stream in real-time. Experimental results are provided to show that the proposed approach is amenable to direct, straightforward implementation and yet outperforms similar existing approaches in regulating the bit-rate and the frame size of M-JPEG streams.     

非金属输油管道静电起电及防护研究

非金属管道以其优异的工作性能成为油气管道技术发展的新方向,但输油过程中伴随的静电问题成为管道安全运行的隐患。基于扩散双电层理论,对金属管道和非金属管道的静电起电机理进行了分析;阐明了管内流体流动速度,管道性质和油品性质对油流带电的影响规律;归纳了输油管道的主要静电放电类型及其危害影响;从避免静电产生和中和静电两方面提出了一系列非金属输油管道的静电控制与防护措施。     

一种可重构流媒体调度算法

针对现有流媒体算法在异构环境下性能恶化的问题,论文提出一种支持用户异构性的可重构流媒体调度算法RSMS算法。该算法引入了追赶流的概念,能重构追赶流的速率来服务于具有不同接收带宽的异构用户,并最终通过流合并达到资源共享的目的。分析了RSMS算法的最佳组播调度间隔、所需的平均服务器带宽和服务器带宽需求分布。仿真实验表明该算法简单高效,可扩展性好。     

研祥客制化轨道交通计算机应用

在论述轨道交通AFC系统原理的基础上,研讨研祥客制化专用AFC系统主机ERC-1003V与Arpex-1600售票控制计算机的工程应用。对于地铁流媒体播放给出基于研祥Arpex-2610主机的工程案例论述。     

基于ASP技术的网络教学系统的设计

针对传统课堂教学中存在的不足，开发设计网络教学系统是具有现实意义，系统主要采用了ASP等Web技术开发，该文对该系统的体系结构、功能等进行了详细的分析，并介绍了设计中所采用的关键技术。     

How the intensity of the immersive experience impels the extent of Social Streaming App dependency? An empirical assessment with mediation and moderation effects

With the rapid growth and popularity of Social Streaming Apps (SSAs) worldwide, it is valuable for scholars to understand the links between immersive experience provided by SSA, users’ attitudes towards SSA, and the resultant SSA dependency. Although unexplored in the SSA context, previous research has indicated the significance of immersive experience and its influence on user’s specific behavior through user attitude. The present study employs Structural Equation Modelling, by using 459 samples from a survey, to explore how the intensity of immersive experience can influence the degree of user dependency on SSA. Results indicate that immersive experience is positively associated with users’ positive attitudes towards SSA, which would lead to SSA dependency. In addition, this study also found out that users’ favorable attitude partially mediates the relationship between immersive experience and solitary play dependency. Whereas, attitude fully mediated the relationship between five out of six dimensions of SSA dependency. Furthermore, to better comprehend the intervening relationships between immersive experiences, user attitude, SSA dependency, the study also conducted a moderation analysis taking frequency of use as a moderating variable. The results illustrate that a high frequency of use is a strong psychological indicator for SSA dependency. This supports the importance of considering actual behavior along with their psychological states when examining users’ immersive experience and their SSA dependency.     

流媒体资源网站的设计

由于多媒体编码和解码的问题．导致不能在线观看．只能下载到本地播放。本文采用了流媒体技术。通过设计WEB视频网站并以其为平台实现视频资源在线播放。本文说明了流媒体服务器的配置和如何使用ASP．NET工具设计设网站。     

一种适用于瘦终端的应用流化方法

由于瘦终端本身的计算和存储能力有限,而云计算有着超强的计算和存储能力,通过服务器端运行终端应用,将应用的图形界面(GUI)抓屏实时编码为视频流,通过网络传输至终端解码呈现应用GUI,解决了瘦终端不能运行复杂应用的问题。提出了一种基于X Window System的应用GUI流化方法,并验证了其可行性和有效性。该方法的优势在于良好的跨平台性,缺点是需要充裕的带宽来保证数据流的传输。     

Thermoacoustic streaming in a tube with isothermal outer surface

Thermoacoustic oscillations at a cycle-steady state in a tube with an isothermal outer wall, and with one end closed and the other end connected to a wave generator, is analyzed based on a linearized theory. From the global mass conservation, an analytical solution has been obtained for the cross-sectional and cycle averaged axial velocity. It is shown that this averaged velocity is non-vanishing due to the mass streaming effect. By analyzing the global momentum balance, it is found that the cycle-averaged pressure depends on the momentum streaming and friction force, and a conservation relationship exists between the momentum streaming and the cycle-averaged pressure for the flow oscillating at a high frequency in a wide tube. An investigation of the global energy balance leads to an expression for thermoacoustic energy streaming. Furthermore, it is shown that the refrigeration effect is mainly caused by the non-vanishing mean velocity, and therefore the mass streaming and the energy streaming are intimately connected.