RS码类的构建及在数据链模拟系统中的应用

Reed Solomon码(RS码)具有强大的纠错能力,在数据通信中得到了广泛的应用,如 RS(31,15)码已经成为美军数据链系统的标准码。为了实现应用于数据链模拟系统中的RS编 译码类,从分析RS纠错编译码原理入手,在研究了RS编译码模型的基础上,重点对RS编译码 的编程实现方法进行了详细分析。以VC+〖KG-*3〗+为编程实现平台,采用面向对象的 程序设计方法,构建且封装了RS编译码类,最后对RS编译码类的纠错性能进行了验证, 结果表明,设计的RS编译码类能够有效纠错且正确恢复发端发送的信息,满足模拟系统的设 计要求。     

音频带宽扩展技术分析与展望

对音频带宽扩展中的非盲目式和盲目式高频重建技术进行了分析 、对比,给出了非盲目式高频重建中的6种技术及盲目式高频重建中的4种技术的基本原理 ,并对它们各自的优劣性进行了评价,指出盲目式高频重建法将是未来频带扩展技术发展中 关注和研究的热点。     

重复交易模型在土地价格指数编制中的应用研究

研究目的:探讨重复交易模型在土地价格指数编制中的应用。研究方法:理论建模和实证研究相结合。研究结果:用该模型编制出2003—2008年杭州住宅用地价格季度指数,拟合度较好且通过各项统计检验。研究结论:重复交易模型在土地价格指数编制中的应用具有良好的效果。     

基于链路共享度的网络编码多播路由算法

针对网络编码中最小编码子图的构造问题,提出了一种基于链路共享度的网络编码多 播路由算法。该算法利用各条链路的共享度不同,依次选择共享度最大的链路加入到多播传 输路径中。实验仿真结果表明,该算法与传统的最短路径多播树算法相比,可节省网络资源 约6%～15%,能更好地均衡网络负载,结合随机网络编码算法,能够有效提升多播传输的性 能。     

可变报文格式编解码模块设计与实现

为适应现代战争数字化的军事需求,解决战场环境下需要传输的信息种类和数量日益增多以及网络带宽受限等问题,设计了可变报文格式（VMF）编解码模块,作为底层消息传送的技术支撑。利用动态链接库、JSON(Java Script Object Notation)、Snappy(压缩算法)等技术为上层应用提供消息的编解码服务,设计基于JSON的可变长报文模板、比特流集成压缩算法、基于JSON的数据字典结构,实现报文的“按需发送”,根据不同的发送需求,动态地组合报文内容。实验显示所设计的模块编码解码只需3 ms左右,而参考系统编解码则需耗时200 ms以上,可见速率提升明显,数据流长度也进一步缩短。     

Growing competition in the healthcare tourism market and customer retention in medical clinics: New and experienced travellers

This research sought to investigate international medical travellers’ post-purchase decision-making process by utilizing key concepts in medical tourism (i.e. medical product quality, effective communication, satisfaction, switching costs, and past experience [first-time vs. repeat experiences]). A visitor survey was conducted at medical clinics. Results of the structural model generally supported the proposed relationships among study variables. The role of study variables in generating revisit intention was found to differ significantly between new and repeat customers, and the strength of the proposed relationships was generally greater in the repeater group than in the first-timer group. This study also identified the mediating impact of satisfaction and switching costs. Additionally, the prominent role of satisfaction in the proposed theoretical framework was identified. The results of a structural-model comparison also revealed that a quality–satisfaction linkage was stronger than its alternative ordering in the proposed framework. Overall, this study provides great insight into medical travellers’ post-purchase behaviours.     

利用SRUDP的3G无线网络视频监控系统设计

为促进无线视频监控领域新技术的开发和应用,立足解决工程实际问题,提出了一种利用简 单可靠用户数据报协议(SRUDP)的3G无线网络视频监控系统的新型设计方案。系统可以对H 264视频流进行分层 模式的高效编码、压缩纠错和实时传输控制,并重新封装用户数据报协议(UDP)、SRUDP和IP 报头。系统采用滑 动窗口机制和重传机制来进行消息的收发同步和流量控制,可以实现任意用户终端对任意监 控点的有效监控。系统视频QoS的控制方式运用迭代算法,发送端可以根据反馈信息通过编 码器进行自适应调整速率,并参考SRUDP缓存进行参数修改,实现鲁棒控制。仿真实验表明 ,在3G网络环境下,基于SRUDP的视频应用在降低视频时延和包丢失率、减少网络拥塞、提 高传输速率和改善视频质量等方面具有明显的优越性。     

无线光通信中一种TPC+OSTBC的级联空时编码方法

在正交空时分组码（OSTBC）基础上,分析了Turbo乘积码（TPC）和OSTBC级联方案的 可行性,提出了一种采用TPC+OSTBC级联的空时编译码方案,分别仿真分析了不同TPC分量码 、不同接收天线数目下系统的差错性能,并对采用OSTBC和TPC+OSTBC级联方法系统的差错性 能进行了对比分析。仿真结果表明：该级联空时编码方法可同时获得全分集和全速率,且差 错性能明显优于只采用OSTBC。     

LINQ技术在高校教学管理信息系统中的应用

结合高校教学管理信息系统的实际需求,采用LINQ技术,设计与开发了高校教学管理信息系统。LINQ数据访问技术在高校教学管理信息系统实施中的应用表明:这种编程模式降低了编码难度,提高了编码效率,为用户提供了更高的生产力。     

Development of a Scale for Tourism Facilitators

The purpose of this study was to develop and validate a scale of tourism facilitators that may play a significant role in participating in tourism activities. A scale of tourism facilitators was developed directly from the results in this study. One of the most important findings is that the tourism facilitator scale shows relatively acceptable measurement properties and reasonable levels of fit. The investigation of internal consistency and the CFA of the scale confirm the sufficient reliability and validity of the proposed model. The results also provide evidence that the three dimensions of tourism facilitators were negatively related to the three dimensions of tourism constraints, except for the relationship between intrapersonal facilitators and interpersonal constraints. Future studies should examine other countries to validate a more stable tourism facilitator scale and its relationships with related variables. The further testing of the concept of tourism facilitators can determine the role of facilitators at different stages of the destination decision-making process. The findings also provided preliminary evidence supporting the feasibility and value of using the new instrument as well as its relevance to both fundamental and applied research in investigating tourist behavior.