Earthquake Shakes Twitter Users: Real-time Event Detection by Social Sensors ppt
Earthquake Shakes Twitter Users: Real-time Event Detection by Social Sensors ppt
... twenty-first century.
Scientific American, 268(3):94–104, 1991.
Earthquake Shakes Twitter Users:
Real-time Event Detection by Social Sensors
Takeshi Sakaki
The University of Tokyo
Yayoi 2-11-16, ... identi.ca
4
http://mashable.com/2009/08/12/japan -earthquake/
Japan Earthquake Shakes Twitter Users
And Beyonce: Earthquakes are one thing you can
bet on being covered on...
Báo cáo khoa học: "A Support Platform for Event Detection using Social Intelligence" pot
... 3010, Australia
Abstract
This paper describes a system designed
to support event detection over Twitter.
The system operates by querying the data
stream with a user-specified set of key-
words, filtering ... detect events such as traffic
jams, or track complex unfolding events such as
natural disasters.
In this work, we present a system intended
to support real-time analysis and geoloc...
Lucid Dreaming: Reliable Analog Event Detection for EnergyConstrained Applications ppt
... other
ideal characteristics. Thus, a variety of unconventional
sensors, or sensors operating in unconventional ways,
may b e used as event detection sensors, e.g.,
– Solar cells, for light;
– Unbiased microphones, ... 18, 9] by raising a hardware interrupt.
The interrupt handler in turn causes high resolution sam-
pling to occur.
In our exemplar application, event detection is s...
Tài liệu Planbased Complex Event Detection across Distributed Sources pdf
... distance(PD1.loc, PD2.loc) ≥ 12
2.3 Event Detection Graphs
Our event detection model is based on event detection graphs [8].
For each event expression, we construct an event detection tree. These
trees ... any
complex events of interest, as specified by the users.
To achieve this goal, we use event detection plans to guide the
event acquisition decisions. Event det...
Tài liệu Semi-supervised Adapted HMMs for Unusual Event Detection docx
... audio, visual and audio-visual events.
4.1 Performance Measures
The problem of unusual event detection is a two-class
classification problem (unusual events vs. usual events),
with two types of errors: ... unusual event modal from
the usual event model via Bayesian adaptation at each iter-
ation. With the increase of unusual event models, more un-
usual events can be detected, while...
Sentinel Event Data Event Type by Year 1995-2012 pdf
...
2011
2012
Number of Events Reviewed by
TJC
Sentinel Event Alert
#17: "Fires in the
Home Care Setting"
March 2001
Sentinel Event Alert
# 29: "Preventing Surgical
Fires" ...
Number of Events Reviewed by
TJC
Added to Sentinel
Event Policy in 2005
Sentinel Event Alert
#18: "Kernicterus Threatens
Health of Infants"
April 2001
Sentinel E...
Event Detection from Time Series Data pdf
... comparing the algorithms with visual change-
point detection by humans.
This paper is organized as follows: In section 2
we formally describe the event detection problem.
Section 3 presents the batch ... 6. Section
7 concludes the paper.
2
Event Detection as Change-Point
Detection
In this paper we are interested in real-valued time
series denoted by y(t), t = 1,2, . ....
Audio-based Event Detection for Sports Video pot
... were placed in a seventh ‘ambiguous’ outlier class.
Event Detection To identify key events, given a classified audio sequence, a
further decision process was formed. Since a key event triggers a ... correctly identified event was determined to be:
“if a flagged event window’ overlapped a ‘true event window’ at any time-point”.
If there was some overlap between an actual event and an...
Event Detection from Flickr Data through Wavelet-based Spatial Analysis pdf
... problem of event detection is part of a broader ini-
tiative called Topic Detection and Tracking (TDT) [3]. The
objective of event detection is to discover new or previously
unidentified events, ... the
constraints of aperiodic events or the constraints of periodic
events.
4. EVENT DETECTION
In this section, we first d escribe the main steps of our
Flickr event detection appro...
Báo cáo khoa học: "A Novel Burst-based Text Representation Model for Scalable Event Detection" pptx
... Fi-
nally, by removing all candidate seed events which
neither belong to significant events nor moderate
events, we derive a test collection consisting of 24
significant events and 40 moderate events.
6
4.3 ... of relevant
documents, namely significant events and moder-
ate events. A significant event is required to have
at least 300 relevant docs, and a moderate event is
required to have 1...
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