III-COR-Small: Towards Ubiquitous Location Services: Scalability and Privacy of Location-based Continuous Queries

基于位置的连续查询是基于位置的服务的监控、警报和通知的基础。现有的基于位置的连续查询背后的当前技术和软件基础设施并不是为了处理其使用量的巨大增长，也不是为了维护其用户的位置隐私。该项目的目标是进行研究，开发必要的知识，并建立软件基础设施，以（1）扩大基于位置的连续查询，以处理大量的用户，（2）注入隐私意识的基于位置的连续查询，可以提供高质量的真实的时间答案，而无需明确的用户位置的知识。该项目通过以下方法实现其目标：（1）采用内置方法，其中基于位置的查询被实现为数据库引擎内的查询操作符，（2）开发自适应位置感知查询优化技术，（3）利用用于基于位置的连续查询的共享执行和负载削减技术（4）利用用户隐私和服务质量之间的折衷，以及（5）开发有效的隐私保护连续查询处理技术。该项目的应用包括基于位置的紧急响应、智能交通系统、交通控制、车队管理和基于位置的广告。该项目支持博士生在基于位置的服务和数据库系统领域进行研究。组织了相关的教程和讲习班。介绍了一个新的研究生水平的课程整合从这个项目的研究成果。本研究的出版物、技术报告、软件和实验数据通过项目网站（http：//www.cs.umn.edu/mokbel/LocationBasedWeb）发布。

Location-based continuous queries are the backbone for monitoring, alerting, and notification location-based services. The current technologies and software infrastructure behind existing location-based continuous queries are not designed to handle their formidable rise in usage nor to maintain the location privacy of their users. The goal of this project is to conduct research, develop requisite knowledge, and build software infrastructure to (1) scale up location-based continuous queries to deal with very large number of users, and (2) inject privacy-awareness in location-based continuous queries where a high quality real time answer can be provided without the explicit knowledge of user locations. The project achieves its goals using the following approaches: (1) employ a built-in approach in which location-based queries are realized as query operators inside a database engine, (2) develop adaptive location-aware query optimization techniques, (3) exploit shared execution and load shedding techniques for location-based continuous queries(4) exploit the trade-off between user privacy and quality of service, and (5) develop efficient privacy-preserving continuous query processing techniques. Applications will benefit from this project include location-based emergency response, intelligent transportation systems, traffic control, fleet management, and location-based advertising. The project supports PhD students to pursue research in the areas of location-based services and database systems. Related tutorials and workshops are organized. A new graduate-level course integrating the research results from this project is introduced. Publications, technical reports, software, and experimental data from this research are disseminated via the project web site(http://www.cs.umn.edu/~mokbel/LocationBasedQueries).