Comments on enhanced yoking proof protocols for radio frequency identification tags and tag groups

A radio frequency identification (RFID) yoking proof scheme can generate proofs of simultaneous presence of two tags in the range of a specified reader so that an off-line verifier can verify the proofs later. This proof has found several interesting applications. However, many existing RFID yoking schemes are vulnerable to replay attacks. To overcome the weaknesses, Cho et al. proposed a new RFID yoking proof protocol and a new grouping protocol. Unfortunately, Cho et al.’s schemes are still vulnerable to replay attacks. In this paper, in addition to demonstrating weaknesses, we further discuss the rationale behind these weaknesses to provide a guide line for designing secure RFID yoking schemes. Based on the guide line, we propose a new RFID yoking scheme and a new RFID grouping scheme. Performance evaluation shows that our scheme outperforms its counterparts.     

成品油码头系缆墩和系缆排架结构的比选

结合某沿海成品油码头工程实例,对系缆墩式结构和系缆排架式结构进行设计比较,采用有限元方法对两种结构进行计算,阐述两种结构的优缺点。     

内容、用户和收入:网络视频平台差异化管理模式研究

理论分析表明媒体互联网平台内容、用户和收入呈现分类演进趋势，网络视频平台呈现专业生产内容(PGC)模式、专业用户生产内容(PUGC)模式和用户生成内容(UGC)模式这三种差异化运营模式。用爱奇艺、哔哩哔哩和快手这三家网络视频企业的投资数据来分析其在内容、用户和收入上的差异化管理模式的选择，用运营和财务数据差异来验证其差异化经营模式产生的结果。研究表明：PGC更注重精品内容的生产与购买，关注增加和挖掘会员用户，实现内容变现下的会员和广告收入；PUGC更关注圈层用户的专业化内容生产与内容分享，关注用户间的圈层吸引与聚集，提升用户活跃度与黏性，实现圈层用户的流量变现和拓展产品衍生收入；UGC以用户上传视频为信息内容，以强大的后台算法和精准推送来聚合并提升用户活跃度和黏性，以直播和线上营销为主要收入来源。差异化的经营模式分析对网络视频平台企业运营优化和监管提升提供了较好的支持。     

价格听证的制度性分析

价格听证制度作为一种兴起于西方的价格制定制度,近年来在我国也逐渐为人们所熟悉、了解。本文将抛开价格听证的现象本身,而是从价格听证中存在的几种关系为切入点,深入分析价格听证现象背后的实质,进而提出我国价格听证制度改进完善的意见和建议。