An Auction-Based Recommender System for Over-The-Top Platform

In this era of digital domination,it is fit to say that individuals are more inclined towards viewership on online platforms due to the wide variety and the scope of individual preferences it provides.In the past few years,there has been a massive growth in the popularity of Over-The-Top platforms,with an increasing number of consumers adapting to them.The Covid-19 pandemic has also caused the proliferation of these services as people are restricted to their homes.Consumers are often in a dilemma about which subscription plan to choose,and this iswhere a recommendation systemmakes their task easy.The Subscription recommendation system allows potential users to pick the most suitable and convenient plan for their daily consumption from diverse OTT platforms.The economic equilibrium behind allocating these resources follows a unique voting and bidding system propped by us in this paper.The systemis dependent on two types of individuals,type 1 seeking the recommendation plan,and type 2 suggesting it.In our study,the system collaborates with the latterwho participate in voting and invest/bid in the available options,keeping in mind the user preferences.This architecture runs on an interface where the candidates can login to participate at their convenience.As a result,selective participants are awarded monetary gains considering the rules of the suggested mechanism,and the most voted subscription plan gets recommended to the user.

显微镜下over-the-top技术治疗腰椎管狭窄症

[目的]评价显微镜下over-the-top技术单侧通道双侧减压治疗单节段中央型腰椎管狭窄症的临床疗效。[方法]选取单节段腰椎管狭窄症患者30例,显微镜下over-the-top技术行单侧通道双侧减压术,记录手术时间、术中出血量、引流量、术后住院时间、并发症、手术前后站立时间和步行距离等情况;观察手术前后影像学变化;采用腰疼视觉模拟评分(VAS评分)和Oswestry功能障碍指数(ODI)评价患者腰腿痛及功能改善情况,术后1年随访时采用MacNab功能评分评价临床疗效。[结果]30例患者术中无脑脊液漏及脊髓损伤,手术时间60~140min,术中出血量50~300ml;术后下床活动时间6~24h,术后无切口感染、裂开等并发症发生。患者获12~24个月随访。术后复查CT显示椎管前后径、双侧侧隐窝直径均较术前扩大(P<0.05)。所有患者术后临床症状明显改善或消失。术后3d及末次随访时患者腰腿痛VAS评分和ODI指数较术前明显改善,差异均有统计学意义(P<0.05)。末次随访时采用MacNab标准评价临床疗效:优21例,良8例,可1例,优良率96.67%。[结论]显微镜下over-the-top技术行单侧通道双侧减压术治疗腰椎管狭窄,中期随访效果良好,远期疗效有待进一步随访观察。

单侧通道下入路运用over-the-top技术行双侧椎板下减压治疗中重度腰椎管狭窄的疗效

目的观察单侧通道下入路运用over-the-top技术行腰椎双侧椎板下减压治疗腰椎椎管狭窄的临床疗效。方法选取60岁以上腰椎管狭窄症患者10例，采用单侧通道下入路使用over-the-top技术行双侧椎板下减压。回顾性分析患者的临床资料，分析治疗效果。结果10例患者手术时间60～140min，术中出血量50~300ml；术后下床活动时间为6～24h。患者术中无脑脊液漏及脊髓损伤，术后无切口感染、裂开等并发症发生。患者获3～24个月随访。术前、术后1周、末次随访时，Oswestry功能障碍指数评分有统计学差异[（47．9±6．9）分VS．（38．9±4．9）分VS．（33．5±4．1）分]（P〈0．05）；VAS疼痛评分有统计学差异[（6．7±0．6）分vs．（4．7±o．5）分VS．（2．9±0．4）分]（P〈0．05）。术后重建CT显示椎管前后径、双侧侧隐窝直径较术前扩大（P（O．05）。结论单侧通道下入路运用over-the-top技术行腰椎双侧椎板下减压治疗腰椎椎管狭窄，适用于老年中重度椎管狭窄，中期随访效果良好。

一种媒体数据高效直播的NFV-SDN框架设计

Open Flow是软件定义网络(SDN)的核心协议,能实现网络系统控制与转发的分离,加速网络数据的传输。NFV作为SDN的一种实现思路,是解决媒体数据基于OTT传输的低延迟与可扩展性的可靠手段。本设计首先采用Flow Visor对传输网络进行虚拟网络层的构建,分析了一种满足Qo S需求的采用Open Flow协议与SDN控制器产生Flow-table实现数据快速传输的机制,最后给出一种用于媒体数据快速传输的NFV-SDN框架。实验结果表明提出的NFV-SDN框架能较大程度地缩短流媒体端到端传播的延迟时间,且减少跳点数与服务负载,提升了网络数据传输的流畅性。