报告题目:Understanding and Modeling of WiFi Signal Based Human Activity Recognition
Privacy Preserving Range Queries with Provable Security and Sublinear Scalability
报告日期及时间:2015.10.14 下午2:00-3:30
报告地点: B403
报告人:Alex X. Liu教授
报告人单位:Michigan State University
报告摘要:
In this talk, I will talk about two topics: WiFi signal based human activity recognition
and privacy preserving range queries. Human activity recognition is the core technology
that enables a wide variety of applications such as health care, smart homes, fitness
tracking, and building surveillance. We recognize human activities using signals from
commercial WiFi devices. Human bodies reflect wireless signals as they are mostly made
of water. Different human activities cause different changes on wireless signals. Thus,
by analyzing the changes in wireless signals, we can recognize the corresponding human
activities that cause the changes. We classify human activities into macro activities,
which involve mostly arm, leg, or body scale movements, and micro activities, which
involve mostly finger or hand scale movements. Human activity recognition and monitoring
is the enabling technology for various applications such as elderly/health care, building
surveillance, human-computer interaction, health care, smart homes, and fitness tracking.
Driven by lower cost, higher reliability, better performance, and faster deployment, data
and computing services have been increasingly outsourced to clouds such as Amazon EC2.
However, privacy has been the key road block to cloud computing. On one hand, to leverage
the computing and storage capability offered by clouds, we need to store data on clouds.
On the other hand, due to many reasons, we may not fully trust the clouds for data privacy.
This paper concerns the problem of privacy preserving range query processing on clouds.
Although some prior privacy preserving range query processing schemes have been proposed
in the past, none of them can achieve both provable security and sublinear scalability.
In this work, we propose the first range query processing scheme that achieves both.
We implemented and evaluated our scheme on a real world data set. The experimental results
show that our scheme can efficiently support real time range queries with strong privacy
protection. For example, for a set of 10,000 data items, the time for processing a query
is only 0.062 milliseconds, which is enough for real time applications.
个人简介:
Alex X. Liu received his Ph.D. degree in Computer Science from The University of Texas at
Austin in 2006. He received the IEEE & IFIP William C. Carter Award in 2004, the National
Science Foundation CAREER Award in 2009, and the Michigan State University Withrow
Distinguished Scholar Award in 2011. His special research interests are in networking,
security, and privacy. His general research interests include computer systems, distributed
computing, and dependable systems.
邀请人: 徐宝文教授, 何德彪副教授