A new buyer-seller watermarking protocol without double embedding

AbstractCopy deterrence is a digital watermarking application which enables a seller to identify the buyers who obtain digital content legally but illegally redistribute it. However, in many buyer-seller watermarking protocols proposed for copy deterrence, the seller has to embed two watermarks into each copy of the digital content before it is sold. In this paper, we propose a new buyer-seller watermarking protocol in which the seller can reduce the number of the embedded watermarks from two to one. The proposed protocol also provides a more efficient solution to the unbinding problem than that of Lei et al’s scheme.     

Analysis and enhancement of a watermarking protocol suitable for web context

AbstractA buyer-seller watermarking protocol is a combination of traditional watermarking and fingerprinting techniques. Recently, Frattolillo proposed such a watermarking protocol suitable for web context. Frattolillo’s scheme has two problems which would make it hard to implement practically. Several possible solutions to the two problems are presented in this paper.     

跨京杭运河特大桥钢管拱安装方案设计

跨京杭运河特大桥为跨径为132m的单孔钢管拱型桥,为优化钢管拱安装工程,针对钢管拱跨度长、桁高大等特点,通过比选钢管拱安装的2个可行方案,得出钢管拱最终安装方案为立柱式拱架法浮吊吊装。介绍了该方案的具体实施过程和钢管临时墩设计与安装及拱肋吊装等主要施工技术的解决方案。     

城市隧道洞口景观协调性研究

依据城市隧道洞口视觉景观格局的影响因素,从视觉协调与驾驶员的行驶安全性两方面进行指标选择,建立指标评价体系,运用集对分析方法对重庆既有城市隧道的景观环境现状进行评价分析。结果表明,该方法适用于城市隧道洞VI评价;同时提出了城市隧道洞口景观环境建设的建议。