Information Technology Reference
In-Depth Information
TABLE 5.1
Format of Events
Event Name
Field 1
Field 2
Field 3
Tuple Template for Registration
Task status event
Task no.
“Status”
Value
New tuple (new Field(String),
status, new Field(String))
Output event
Task no.
Port no.
Value
New tuple (taskNo, portNo,
new Field(String))
Job status event
Job no.
Task no.
Value
New tuple (new Field(String),
taskNo, new Field(String))
by TMs and WCO used to control TMs activation. The i rst i eld is the ID of
the task, the second i eld is string “status” to indicate the type of tuple for
the registration purposes, and the third i eld gives the value of status.
Child TMs need output events sent by the parent TMs to be informed if
their inputs are available. The events have three i elds: the task ID is given
in the i rst i eld, the second i eld is port numbers, and the third i eld is the
location of output. One task can have multiple jobs. Job status events are
sent by the job monitor. Every job status event provides a job ID and its
task ID with status value. TMs make decisions according to the job events.
For example, when a job has failed, the TM can reschedule it on another
resource in the resource group. The tuple templates are used for subscribing
to the corresponding event. For example, task status events can be received
by a tuple template with the second i eld as a String called “status.”
5.10 A Case Study in fMRI Data Analysis
Magnetic resonance imaging (MRI) [14] uses radio waves and a strong
magnetic i eld to provide detailed images of internal organs and tissues.
Functional MRI (fMRI) [15] is a procedure that uses MRI to measure the
signal changes in an active part of the brain. fMRI is becoming a major
diagnostic method for learning how a normal or diseased brain work.
fMRI images are obtained by scanning the brains of subjects as they per-
form cognitive tasks. A typical study of fMRI data consists of multiple-
stage processes that begin with the preprocessing of raw data and conclude
with a statistical analysis. Such analysis procedures often require hun-
dreds to thousands of images [16].
5.10.1 Population-Based Atlas Workflow
Population-based atlas [17] creation is one of the major fMRI research
activities. These atlases combine anatomy imaging data from healthy and
 
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