摘要：Vehicles enlisted with computing, sensing and communicating devices can create vehicular networks, a subset of cooperative systems in heterogeneous environments, aiming at improving safety and entertainment in traffic. In vehicular networks, a vehicle＇s identity is associated to its owner＇s identity as a unique linkage. Therefore, it is of importance to protect privacy of vehicles from being possibly tracked. Obviously, the privacy protection must be scalable because of the high mobility and large population of vehicles. In this work, we take a non-trivial step towards protecting privacy of vehicles. As privacy draws public concerns, we firstly present privacy implications of operational challenges from the public policy perspective. Additionally, we envision vehicular networks as geographically partitioned subnetworks （cells）. Each subnetwork maintains a list of pseudonyms. Each pseudonym includes the cell＇s geographic id and a random number as host id. Before starting communication, vehicles need to request a pseudonym on demand from pseudonym server. In order to improve utilization of pseudonyms, we address a stochastic model with time-varying arrival and departure rates. Our main contribution includes： 1） proposing a scalable and effective algorithm to protect privacy; 2） providing analytical results of probability, variance and expected number of requests on pseudonym servers. The empirical results confirm the accuracy of our analytical predictions.

摘要：用户隐私安全已成为云图书馆发展过程中亟待解决的关键问题。文章在讨论云图书馆隐私保护研究现状的基础上,提出嵌入"从设计着手隐私(privacy by Design,Pb D)"理论的四个隐私管理原则,即隐私界定与分级、隐私数据最小化、隐私保护非零和性及全生命周期的隐私保护,据此构建云图书馆个人隐私管理架构,并探讨其中的关键技术和隐私风险评估方法。

摘要：Based on concept and function of garden space,the paper had proposed three elements constituting space which were "ground","roof" and "wall",and pointed out the importance of privacy in public environmental *** in gardens had certain requirement for private space,which was contradictory with the open attribute of *** was considered that theories on confliction and solution of confliction in TRIZ(Theory of the Solution of Inventive Problems)could help to solve this *** analysis on spatial composition forms of modern landscape,based on people's psychological habit,by combining with basic elements of landscape,it had illustrated openness of surface open space,definition of semi-open space and privacy of point enclosed space;discussed possibility to create private landscape in public space;and finally proposed a more reasonable and humanized public space mode of "human-environment-society".