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!! Temporal Drift While Browsing Web Archives

When viewing archived web pages through an archive's user interface, the archive attempts to simulate the familiar experience of browsing the Web. The user begins by specifying a URI and selecting a datetime to view from a list—this is the target datetime. The archived web page is then displayed. As the user follows links, each click changes the target datetime to the archive datetime the selected page. The result is a nearly-silent drift away from the datetime originally selected. (Try it at the [[http://www.archive.org|Internet Archive]].)

There are many circumstances where this drift is undesirable. But until recently, there was no convenient method to control it. With [[http://www.mementoweb.net|Memento]] API and the [[https://addons.mozilla.org/en-us/firefox/addon/mementofox/|MementoFox]], this changes.  Two target datetime policies were identified and tested: ''Sliding'' and ''Sticky''. The Sliding Policy models existing archive browsing interfaces, allowing the target datetime to change with each link followed. The Sticky Policy fixes the target datetime to the first datetime selected.

%center%Attach:drift-bystep-median-all.png | Figure 1. Median Temporal Drift by Step

As shown in figure 1 above, we found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.

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!! Temporal Drift While Browsing Web Archives

When viewing archived web pages through an archive's user interface, the archive attempts to simulate the familiar experience of browsing the Web. The user begins by specifying a URI and selecting a datetime to view from a list—this is the target datetime. The archived web page is then displayed. As the user follows links, each click changes the target datetime to the archive datetime the selected page. The result is a nearly-silent drift away from the datetime originally selected. (Try it at the [[http://www.archive.org|Internet Archive]].)

There are many circumstances where this drift is undesirable. But until recently, there was no convenient method to control it. With [[http://www.mementoweb.net|Memento]] API and the [[https://addons.mozilla.org/en-us/firefox/addon/mementofox/|MementoFox]], this changes.  Two target datetime policies were identified and tested: ''Sliding'' and ''Sticky''. The Sliding Policy models existing archive browsing interfaces, allowing the target datetime to change with each link followed. The Sticky Policy fixes the target datetime to the first datetime selected.

%center%Attach:drift-bystep-median-all.png | Figure 1. Median Temporal Drift by Step

As shown in figure 1 above, we found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.

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%center%Attach:pattern-1RB.png | Figure 3. Temporal Coherence
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%center%Attach:pattern-1RB.png | Figure 3. Prima Facie Coherence
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%center%Attach:pattern-1RN.png | Figure 2. Temporal Violation

Temporal coherence of composite mementos is ongoing research. A catalog of temporal coherence patterns will be published on [[http://www.arXiv.org|ArXiv]] in the next few weeks.
to:
%center%Attach:pattern-1RN.png | Figure 2. Prima Facie Violation

Temporal coherence of composite mementos is ongoing research. A comprehensive technical report covering the patterns greater depth is available: [[http://arxiv.org/abs/1402.0928|arXiv:1402.0928]].
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Temporal coherence of composite mementos is ongoing research. A catalog of temporal coherence patterns will be published on [[http://www.arXiv.org|ArXiv]] in the next few weeks.

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!! Temporal Drift While Browsing Archive Holdings
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!! Temporal Drift While Browsing Web Archives
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%center%Attach:drift-bystep-median-all.png

As shown in the graph above, we found that the Sticky Policy controlled drift
, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.

!! Temporal Coherence of Composite Resources
to:
%center%Attach:drift-bystep-median-all.png | Figure 1. Median Temporal Drift by Step

As shown in figure 1 above
, we found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.

!! Temporal Coherence Patterns in Composite Mementos

Informally, a ''composite memento'' is an archived web page and all the archived resources (images, stylesheets, etc.) required to render the page in a web browser. A composite memento can be considered a tree, as shown in the figure 2 below. The root resource, normally a web page, embeds other resources, which can embed other resources, etc. When viewed in a web browser (ex. [[http://web.archive.org/web/19970102130137/http://cs.odu.edu/|January 2, 1997 ODU CS Home Page]]), a single datetime is displayed even though the root and each embedded resource were captured at different times.

%center%Attach:composite-memento-tree.png | Figure 2. Composite Memento Tree

When evaluating temporal coherence of embedded resources, the relationships between the root and embedded mementos form a discrete number of different patterns. The example diagrammed in figure 3 shows an embedded memento (blue) captured after the root (red), but with a Last-Modified datetime before the root's capture datetime. This is a temporally coherent state.

%center%Attach:pattern-1RB.png | Figure 3. Temporal Coherence

On the other hand, figure 4 shows an embedded memento that was both captured after the root and has a Last-Modified datetime after the root's capture datetime. This is a temporal violation.

%center%Attach:pattern-1RN.png | Figure 2. Temporal Violation



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There are many circumstances where this drift is undesirable. But until recently, there was no convenient method to control it. With [[http://www.mementoweb.net|Memento]] and the [[https://addons.mozilla.org/en-us/firefox/addon/mementofox/|MementoFox]], this changes.  Two target datetime policies were identified and tested: ''Sliding'' and ''Sticky''. The Sliding Policy models existing archive browsing interfaces, allowing the target datetime to change with each link followed. The Sticky Policy fixes the target datetime to the first datetime selected.
to:
There are many circumstances where this drift is undesirable. But until recently, there was no convenient method to control it. With [[http://www.mementoweb.net|Memento]] API and the [[https://addons.mozilla.org/en-us/firefox/addon/mementofox/|MementoFox]], this changes.  Two target datetime policies were identified and tested: ''Sliding'' and ''Sticky''. The Sliding Policy models existing archive browsing interfaces, allowing the target datetime to change with each link followed. The Sticky Policy fixes the target datetime to the first datetime selected.
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We found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.
to:
As shown in the graph above, we found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.
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%center%[[(Attach:)drift-bystep-median-all.png|Figure 1. Median Drift by Step (click)]]
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%center%Attach:drift-bystep-median-all.png
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I am a Ph.D. student and researcher at [[http://www.odu.edu|Old Dominion University]] majoring in Computer Science.  My emphasis is Web Preservation with a focus on the quality of archived resources in existing web archives such as [[http://www.archive.org|The Internet Archive]].  I work under the supervision of [[http://www.cs.odu.edu/~mln/|Dr. Michael Nelson]].
to:
I am a Ph.D. student and researcher at [[http://www.odu.edu|Old Dominion University]] majoring in Computer Science.  My emphasis is Web Preservation with a focus on the temporal quality of existing holdings of web archives such as [[http://www.archive.org|The Internet Archive]].  I work under the supervision of [[http://www.cs.odu.edu/~mln/|Dr. Michael Nelson]].
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\\

!! Temporal Drift While Browsing Archive Holdings

When viewing archived web pages through an archive's user interface, the archive attempts to simulate the familiar experience of browsing the Web. The user begins by specifying a URI and selecting a datetime to view from a list—this is the target datetime. The archived web page is then displayed. As the user follows links, each click changes the target datetime to the archive datetime the selected page. The result is a nearly-silent drift away from the datetime originally selected. (Try it at the [[http://www.archive.org|Internet Archive]].)

There are many circumstances where this drift is undesirable. But until recently, there was no convenient method to control it. With [[http://www.mementoweb.net|Memento]] and the [[https://addons.mozilla.org/en-us/firefox/addon/mementofox/|MementoFox]], this changes.  Two target datetime policies were identified and tested: ''Sliding'' and ''Sticky''. The Sliding Policy models existing archive browsing interfaces, allowing the target datetime to change with each link followed. The Sticky Policy fixes the target datetime to the first datetime selected.

%center%[[(Attach:)drift-bystep-median-all.png|Figure 1. Median Drift by Step (click)]]

We found that the Sticky Policy controlled drift, keeping it to just under 14 days. The sticky policy, on the other hand, allowed drift to continually increase as the number of pages viewed increased. Details were [[http://dx.doi.org/10.1145/2467696.2467718|published]] at [[http://www.jcdl2013.org|JCDL 2013]] (nominated for best student paper). A preprint is available on [[http://arxiv.org/pdf/1309.5503|arXiv]].  An extended version will be available in a special edition of [[http://www.springer.com/computer/database+management+%26+information+retrieval/journal/799|IJDL]] in late 2013 or early 2014.

!! Temporal Coherence of Composite Resources
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My name is Scott Ainsworth.  I am a Ph.D. student and researcher at [[http://www.odu.edu|Old Dominion University]] majoring in Computer Science.  My emphasis is Web Preservation with a focus on the quality of archived resources in existing web archives such [[http://www.archive.org|The Internet Archive]].  I work under the supervision of [[http://www.cs.odu.edu/~mln/|Dr. Michael Nelson]].
to:
I am a Ph.D. student and researcher at [[http://www.odu.edu|Old Dominion University]] majoring in Computer Science.  My emphasis is Web Preservation with a focus on the quality of archived resources in existing web archives such as [[http://www.archive.org|The Internet Archive]].  I work under the supervision of [[http://www.cs.odu.edu/~mln/|Dr. Michael Nelson]].
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!! News


'''December 15, 2012''': In Spring 2013, I am teaching [[CS418-S13/Main|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available.
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In Spring 2013, I am teaching [[CS418-S13/Main|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available.
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'''December 15, 2012''':
In Spring 2013, I am teaching [[CS418-S13/Main|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available.
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(:title About Me:)
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(:notitle:)
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==== News ====
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!! News
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In Spring 2013, I am teaching [[CS418-S13|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available.
to:
In Spring 2013, I am teaching [[CS418-S13/Main|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available.
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(:title About Me:)
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Welcome to PmWiki!

A local copy of PmWiki's
documentation has been installed along with the software,
and is available via the
[[PmWiki/documentation index]]

To continue setting up PmWiki, see [[PmWiki/initial setup tasks]].

The [[PmWiki/basic editing]] page describes how to create pages
in PmWiki.  You can practice editing in the
[[wiki sandbox]].

More information about PmWiki is available from
http://www.pmwiki.org .
to:
My name is Scott Ainsworth.  I am a Ph.D. student and researcher at [[http://www.odu.edu|Old Dominion University]] majoring in Computer Science.  My emphasis is Web Preservation with a focus on the quality of archived resources in existing web archives such [[http://www.archive.org|The Internet Archive]].  I work under the supervision of [[http://www.cs.odu.edu/~mln/|Dr. Michael Nelson]].

Prior to my current academic studies, I spent time in the U.S. Navy and spent several decades as a successful software engineer.  I enjoy mentoring and teaching.  In 2006, I decided to return to school in order to further my education and formally prepare for a possible future teaching Computer Science.

==== News ====

In Spring 2013, I am teaching [[CS418-S13|CS 418]], CRN 30469.  The [[CS418-S13/Syllabus]] and [[CS418-S13/Schedule]] are available
.
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%rframe% Attach:headshot-200.png

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