30,495 research outputs found
Anti-Fall: A Non-intrusive and Real-time Fall Detector Leveraging CSI from Commodity WiFi Devices
Fall is one of the major health threats and obstacles to independent living
for elders, timely and reliable fall detection is crucial for mitigating the
effects of falls. In this paper, leveraging the fine-grained Channel State
Information (CSI) and multi-antenna setting in commodity WiFi devices, we
design and implement a real-time, non-intrusive, and low-cost indoor fall
detector, called Anti-Fall. For the first time, the CSI phase difference over
two antennas is identified as the salient feature to reliably segment the fall
and fall-like activities, both phase and amplitude information of CSI is then
exploited to accurately separate the fall from other fall-like activities.
Experimental results in two indoor scenarios demonstrate that Anti-Fall
consistently outperforms the state-of-the-art approach WiFall, with 10% higher
detection rate and 10% less false alarm rate on average.Comment: 13 pages,8 figures,corrected version, ICOST conferenc
Recommended from our members
Technical Review of Residential Programmable Communicating Thermostat Implementation for Title 24-2008
Training Future Engineers to Be Ghostbusters: Hunting for the Spectral Environmental Radioactivity
Although environmental radioactivity is all around us, the collective public
imagination often associates a negative feeling to this natural phenomenon. To
increase the familiarity with this phenomenon we have designed, implemented,
and tested an interdisciplinary educational activity for pre-collegiate
students in which nuclear engineering and computer science are ancillary to the
comprehension of basic physics concepts. Teaching and training experiences are
performed by using a 4" x 4" NaI(Tl) detector for in-situ and laboratory
{\gamma}-ray spectroscopy measurements. Students are asked to directly assemble
the experimental setup and to manage the data-taking with a dedicated Android
app, which exploits a client-server system that is based on the Bluetooth
communication protocol. The acquired {\gamma}-ray spectra and the experimental
results are analyzed using a multiple-platform software environment and they
are finally shared on an open access Web-GIS service. These all-round
activities combining theoretical background, hands-on setup operations, data
analysis, and critical synthesis of the results were demonstrated to be
effective in increasing students' awareness in quantitatively investigating
environmental radioactivity. Supporting information to the basic physics
concepts provided in this article can be found at
http://www.fe.infn.it/radioactivity/educational
Environmental Quality Laboratory Research Report, 1985-1987
The Environmental Quality Laboratory at Caltech is a center for research on large-scale systems problems of natural resources and environmental quality. The principal areas of investigation at EQL are:
1. Air quality management.
2. Water resources and water quality management.
3. Control of hazardous substances in the environment.
4. Energy policy, including regulation, conservation and energy-environment tradeoffs.
5. Resources policy (other than energy); residuals management.
EQL research includes technical assessments, computer modeling, studies of environmental control options, policy analyses, and research on important components of the large-scale systems. Field work is also undertaken at EQL, some in collaboration with other organizations, to provide critical data needed for evaluation of systems concepts and models.
EQL's objectives are as follows:
1. To do systematic studies of environmental and resources problems. The results of these studies, including the clarification of policy alternatives, are communicated to decision-makers in government and industry, to the research community, and to the public. As an organization, EQL refrains from advocating particular policies, but seeks to point out the implications of the various policy alternatives.
2. To contribute to the education and training of people in these areas through involvement of predoctoral students, postdoctoral fellows, and visiting faculty members in EQL activities. This educational effort is just as important as the results of the studies themselves, and should make lasting contributions to the nation's ability to solve its environmental and resources problems.
The work at EQL goes beyond the usual academic research in that it tries to organize and develop the knowledge necessary to clarify society's alternatives by integrating relevant disciplines. EQL works on solving problems of specific localities when there is a strong element of public interest or educational value, or the concepts and results are applicable to other places.
The research of EQL during this period was done under the supervision of faculty members in Environmental Engineering Science, Chemical Engineering, and Social Science.
This research report covers the period from October 1985 through September 1987. The publications listed under the individual project descriptions are the new ones for the reporting period
- …