@WebSciDL PhD Student Project Reviews August 5&6, 2015

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Web$Science$and$Digital$Libraries$
Research$Group$$
@WebSciDL$
Review$of$Projects$for$$
Herbert$Van$de$Sompel,$LANL$
Augus...

Corren McCoy
Disambiguation of Alumni from Publicly
Available Social Media Profiles
Presentation for Herbert Van de Sompel...

Let’s be Social!
Directory Search
Name: Michael Nelson
College: Old Dominion
Degree: Computer Science
Year: 1997
2

Motivation
Maintain
relationships
with alumni
Interact and
re-engage
3
Pew Research Survey, Sept. 2014
LinkedIn is used by...

Research Goals
• Given discrete set of attributes
• Leverage public information
• Collect structured/unstructured metadata...

Seminal Works
• Mislove, A., Viswanath, B., Gummadi, K. P., & Druschel,
P. (2010, February). You are who you know: inferri...

Our Work is Informed
Attribute inference based on a Facebook
crawl of a known friends network with
matching to a Student o...

Similarity Metrics

Does it help to know a name?
Census Surnames Social Security Administration
Name Ranking as of 2014
Michael 7 Nelson 40
Mi...

Are Vanity Screen Names Re-used?
LinkedIn: michaellloydnelson
Twitter: phonedude_mln
9

Is the Affiliation Repeated?
LinkedIn: Old Dominion University
Twitter: Old Dominion University mentioned
in bio but could...

How Far Apart in Space?
LinkedIn: Norfolk, Virginia Area
Twitter: Norfolk, VA
11

Do Web Links Point to the Same Page?
LinkedIn: http://www.cs.odu.edu/~mln/
http://ws-dl.blogspot.com/
http://f-measure.blo...

Community Analysis
Surrogate Connections - People Also Viewed
One step from Dr. Nelson One step from Brittany Johnson
14

Community Analysis
Disclosed – (Followers?) and Following
15

Property Graph Analysis
https://twitter.com
/phonedude_mln
https://www.linked
in.com/in/michaelll
oydnelson
16

Property Graph Analysis
https://twitter.com
/phonedude_mln
https://www.linked
in.com/in/michaelll
oydnelson
17
Location
No...

Property Graph Analysis
https://twitter.com
/phonedude_mln
https://www.linked
in.com/in/michaelll
oydnelson
18
Location
No...

Property Graph Analysis
https://twitter.com
/phonedude_mln
https://www.linked
in.com/in/michaelll
oydnelson
19
Geo-
Locati...

Property Graph Analysis
https://twitter.com
/phonedude_mln
https://www.linked
in.com/in/michaelll
oydnelson
20
Geo-
Locati...

Example Searches

LinkedIn Candidate Search
• Leverage Google’s advanced
search operators to improve
precision.
• Trusted information fr...

LinkedIn Metadata
How Prevalent are Nicknames?
Name Michael Nelson Mike Nelson Mike Nelson
Headline Professor at Old Domin...

Twitter Candidate Search
24

Twitter Metadata
Given and Nickname Search
User Name Michael L. Nelson Mike Nelson Mike Nelson
Bio
Head of @WebSciDL, Comp...

Known Issues
• Reliability of Name Searches
– Nicknames list from the Northern (2011) study is
incomplete. Ignores ethnic ...

Known Issues
• Each network takes a different approach to
the visibility of metadata
– Exploit the structure of LinkedIn
–...

By: Alexander Nwala
August 5, 2015
Progress Report
Presented To:
Dr. Herbert Van de Sompel, Dr. Michael Nelson

Progress Report
Outline
• Past projects
• Refactoring Hany’s Carbon date
• What Did It Look Like?
• I Can Haz Memento
• Pr...

Carbon date
• Estimates the creation date of a URI
• The current implementation features a:
• Threaded server
• Concurrent...

What Did It Look Like?
• Tumblr blog which
• Uses the Memento framework to poll various public web archives
• Creates an a...

I Can Haz Memento
• Inspired by the “#icanhazpdf” movement and also built upon the Memento
framework
• For tweets with lin...

Progress Report
Outline
• Past projects
• Refactoring Hany’s Carbon date
• What Did It Look Like?
• I Can Haz Memento
• Pr...

Problem :: Undiscoverable resources are not included in SERPs
• SERP does not have intended resource: “A kinetic theory fo...

Problem :: Information not discoverable from Google do not exist to many web users
• 1st page of SERP does not have intend...

Case 2, SERP for Query: “influenza indonesia”
Google
Search
arXiv.org
Search
Relevant resource
on 7th page
Relevant resour...

Problem :: When to stop?
• A user potentially misses relevant information because it is NOT presented with
search results ...

Goal :: Present resources from multiple unindexed sources with Google SERP
• This can be achieved through middleware such ...

Exploration of DIR :: Problem summary and Goal
• Problem
• Inconsistent views between SERP and special collections
leads t...

Exploration of DIR :: Possible research paths
• Research Pathway 1: Understanding the search results
• Research Pathway 2:...

Research Pathway 1 vs Research Pathway 2
Research Pathway 2:
Understanding the query
• Blindly routing every query to ever...

Research Pathway 1: Find discriminative features for “non-scholarly materials
domain”
Query length
Permutation of Pages
Re...

Research Pathway 1: Find discriminative features for “scholarly materials domain”
Query length
Permutation of Pages
Result...

Research Pathway 1: What next after ﬁnding discriminative features?
• Find a dataset (Done)
• NASA NTRS query log for scho...

Research Pathway 2: Heuristic for unsupervised domain classiﬁcation
Original algorithm 1:
• Idea: Given a query and a list...

Original algorithm 1 Example: Possible domains for query “Lionel messi”
• (terms), 10 of 11 pages
• (barcelona"., barcello...

Original algorithm 2: Heuristic for supervised domain classiﬁcation
• Given a set of predeﬁned domains D:
<a, a, a> <b> <c...

Exploration of DIR :: Summary
• Problem
• There exists an inconsistency between between SERP and
special collections, thus...

TEMPORAL COHERENCE
OF COMPOSITE
MEMENTOS IN WEB
ARCHIVES
SCOTT G. AINSWORTH
OLD DOMINION UNIVERSITY
AUGUST 5, 2015
OLD DOM...

CONTENTS
■ Motivation
(Appearances can be deceiving)
■ Background
■ Temporal Coherence
■ Research
■ What’s next?
8/5/2015 ...

MOTIVATION
TEMPORAL COHERENCE
OF COMPOSITE MEMENTOS
IN WEB ARCHIVES
8/5/2015 Scott G. Ainsworth • Status for Herbert Van d...

APPEARANCES …
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
4
http://web.archive.org/web/2004120919...

… CAN BE DECEIVING
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
5
Root Memento-Datetime: 2004-12-0...

CLEAR OR CLOUDY?
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
6

QUESTIONS
■ How prevalent is temporal incoherence?
■ Can Temporal Coherence be improved using
■ Multiple archives?
■ Addit...

BACKGROUND
COMPOSITE MEMENTOS
COHERENCE STATES
COHERENCE PATTERNS
TEMPORAL COHERENCE
OF COMPOSITE MEMENTOS
IN WEB ARCHIVES...

COMPOSITE MEMENTO
PRESENTATION STRUCTURE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
9
URI-M0
URI...

COHERENCE STATES
■ Prima Facie Coherent
Evidence that the memento existed in its
archived state when the root was acquired...

CONSIDER THIS HTML…
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
11
<html>
<img src="foo.jpeg">
</...

AND THESE RESPONSE HEADERS
HTTP/1.1 200 OK
Server: Tengine/2.0.3
Date: Mon, 27 Apr 2015 22:03:32 GMT
Content-Type: image/j...

PRIMA FACIE COHERENT
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
13
Bracket Pattern:
Memento-Date...

PRIMA FACIE COHERENT
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
14
Equal Pattern: simultaneous c...

PRIMA FACIE VIOLATIVE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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POSSIBLY COHERENT
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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Closest (or only) memento captur...

PROBABLY VIOLATIVE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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Closest (or only) memento captu...

TEMPORAL
COHERENCE
EMBEDDED RESOURCES
REPRESENTING COHERENCE
TEMPORAL COHERENCE
OF COMPOSITE MEMENTOS
IN WEB ARCHIVES
8/5/...

TEMPORAL COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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TEMPORAL COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
20
2005-05-1
4
01:36:08
+9 days
+1...

EMBEDDED RESOURCES
Resource Memento-Datetime Delta Resource
Memento-
Datetime
Delta
h"p://www.cs.odu.edu. 2005205214.01:36...

REPRESENTING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
22

REPRESENTING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
23

REPRESENTING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
24

REPRESENTING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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REPRESENTING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
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THE FULL CHART
Mementos by Delta
RootMemento-Datetime
-3y -1y 0 1y 2y 3y 4y 5y 6y
2013
2012
2011
2010
2009
2008
2007
2006
...

RESEARCH
DATA SET
SAMPLING
STATISTICS
TEMPORAL COHERENCE
OF COMPOSITE MEMENTOS
IN WEB ARCHIVES
8/5/2015 Scott G. Ainsworth...

DATA SET
■ 4,000 sample URI-Rs (JCDL’11 data set)
■ Single and Multiple Archives
■ Two Heuristics:
■ Minimum distance (cur...

SAMPLING & RECOMPOSITION
■ For each sample URI-R (rURI-R):
■ Download available TimeMaps
■ Download a single root Memento ...

ROOT URI-R STATISTICS
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
31
Root URI-Rs archived 2,756 •...

EMBEDDED URI-R STATISTICS
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
32
Embedded URI-Rs 1,623,12...

COMPOSITE MEMENTO (ROOT)
COMPLETENESS & COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
33
...

EMBEDDED MEMENTO COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
34
Description
MinDist
Sin...

WHAT’S NEXT?
EQUALITY & SIMILARITY
MINOR & MAJOR VIOLATIONS
POLICIES & HEURISTICS
CONVEYING COHERENCE
TEMPORAL COHERENCE
O...

EQUALITY & SIMILARITY
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
36
Equality and similarity allo...

MINOR OR MAJOR VIOLATIONS?
■ This is a temporal violation. But is it
meaningful?
■ How to judge?
■ Most archives transform...

POLICY & HEURISTIC TRADEOFFS
■ Speed: minimize distance
■ Completeness: query all archives
(not just top k)
■ Accuracy: ma...

CONVEYING COHERENCE
8/5/2015 Scott G. Ainsworth • Status for Herbert Van de Sompel Visit
39
How to scale to > 100
embedded...

WHAT’S NEXT SUMMARY
■ Equality & Similarity
■ Significance of violation (major? minor?)
■ Policies & Heuristics
■ Conveyin...

Progress Report
Lulwah Alkwai
Presented to:
Dr. Herbert Van de Sompel
1

Previous Work
JCDL 2015 Paper:
“How Well Are Arabic Websites Archived?”
Lulwah M. Alkwai, Michael L. Nelson, and Michele C...

English sports websites are more archived than Arabic
www.espn.go.com www.kooora.com
3

GeoIP only ccTLD only
Both Neither
!  News: alarabiya.net
!  ccTLD: Not Arabic (.net)
!  GeoIP: Not Arabic country (US)
! ...

Selecting seed URIs
Name Registered Year URI count
DMOZ US 1999 Dmoz.org/world/arabic 4,086
Raddadi Saudi Arabia 2000 Radd...

~41%
~38%
~36%
~39%
872
~8%
Language test intersection testing for Arabic language
6

Total Arabic URIs Dataset = (7,976+292,670) = 300,646
Crawling Arabic seed URIs
7

Findings
Our Arabic language dataset was not largely located in Arabic countries
"  Only 14.84% had an Arabic ccTLD
"  Onl...

Youssef Eldakar
Bibliotheca Alexandrina
"  Since 2011, the BA crawls have focused on Egyptian
content
"  Seeds are manuall...

Current Work
Replacements for missing images
Goal:
Make contribution by finding missing images through context and
discove...

Motivation
"  D-Lib Magazine, Jan 2005:
“Transparent Format Migration of Preserved Web Content”
David S. H. Rosenthal, Tho...

Sample log query
0.36.125.141)web.archive.org)5)[01/Jan/2011:01:30:58)+0000])"GET)
hBp://web.archive.org/web/2011010101305...

Check full URI in the IA
>"curl"'I"http://web.archive.org/web/20110101013058/
http://www.slaverymuseum.org/IraAtTable.jpeg...

14
URI requested

15
Referring URI

Check full URI in the live web
"
>"curl"'I"http://www.slaverymuseum.org/
IraAtTable.jpeg"
HTTP/1.1"404"Not"Found"
Date:"Tu...

Check Timetravel
17

Check domain in the live web
>"curl"'I"http://www.slaverymuseum.org"
HTTP/1.1"301"Moved"Permanantly"
Date:"Tue,"04"Aug"201...

Check image name in new page
"  Not found
19

Check leaf page for image name
20
"  Not found

Check domain in the IA
21

Check search engine for image surrounding
text
"  Using the “src” and saving the “alt” in HTML (alternative
information) a...

Searching Google for (IraAtTable.jpeg)
23

24
Found same src name and parts of the surrounding
text

http://signhom.net/professionalshub/wp-content/uploads/
sites/3/2013/11/IraAtTable.jpg
25

>"curl"–I"http://web.archive.org/web/20110101013058/
http://www.slaverymuseum.org/IraAtTable.jpeg""
210"Not"Quite"OK,"But"...

Summary of approaches
"  Check full URI in the live web
"  Check full in URI the IA
"  Check full in URI the timetravel
" ...

Other ideas
Image de-duplication
"  JCDL 2015:
“Identifying Duplicate and Contradictory Information in
Wikipedia”, by Sara...

What has Justin been
up to, lately?
Justin F. Brunelle
Presentation for Herbert Van de Sompel
08/06/2015

A simpler time...

Mass hysteria. Human sacrifices. Dogs and
cats living together.
<iframe><script>...</script></iframe>

Missing resources (bad) and
Temporal violations (worse)
http://ws-dl.blogspot.com/2012/10/2012-10-10-zombies-in-archives.h...

http://en.wikipedia.org/wiki/Main_Page January 18th, 2012

http://web.archive.org/web/20120118110520/http://en.wikipedia.org/wiki/Main_Page:
January 18th, 2012

Not all tools can crawl equally
Live Resource PhantomJS
Crawled
Heritrix Crawled,
Wayback replayed

Current
Work4ow
• Dereference URI-Rs
• Archive
• representation
• Extract embedded
• URI-Rs
• Repeat

Proposed Workflow

<script> tags alone are not indicative of a deferred
representation. JavaScript can be played back in the
archives!
Curren...

<script> tags alone are not indicative of a deferred
representation. JavaScript can be played back in the
archives!
Curren...

Run-time & Frontier size PhantomJS vs. Heritrix
To appear: iPres2015

Constructed a classi=er for Deferred
Representations

Performance metrics of a two-tiered
crawling approach

The classi=er helps crawl deferred
representations most e>ciently

Current & Future Work

Using PhantomJS to execute actions on the client
– Pushing buttons
– Selecting drop-downs
– Archiv...

Presented(by(Mat(Kelly(for(Herbert(Van(de(Sompel(
!
Web$Science$and$Digital$Libraries$Research$Lab$
Old(Dominion(Universit...

•  Software as a support vehicle
•  Issues investigating for PhD research topic
•  Sample access patterns mitigated by new...

Building Software
as a PhD Researcher
SoGware(as(a(Support(Vehicle(

•  Purpose: capture what user sees into
WARC
– instead of delegation-by-URI
•  Barriers:
– Restrictive browser extension A...

•  “Glue” between institutional tools
– hard to configure and use
•  Native binaries
– difficult to maintain but novel
•  ...

•  Integrates live + archived web experience
•  Become familiar with Memento
dynamics & usage patterns
•  Provide eventual...

•  Given same input (URI), tools produce
varying output
•  Experiment to measure variance
•  Identified hard-to-archive re...

Current Research

private(
archive(
private(
archive(
other(
private(
archive(
other(
private(
archive(
HVDS(PresentaFon( 9(

private(
archive(
private(
archive(
other(
private(
archive(
TimeMap
other(
private(
archive(
HVDS(PresentaFon( 10(

t = k! t = k-1!≠
HVDS(PresentaFon( 11(

HVDS(PresentaFon( 12(

90 DAYS AT A TIME
ONLY BACK TO ONE YEAR!
HVDS(PresentaFon( 13(

1(year(ago( 2(year(ago( 10(year(ago(
…(
180(days(ago(
TimeMap
HVDS(PresentaFon( 14(

private(
archive(
HVDS(PresentaFon( 15(

HVDS(PresentaFon( 16(
Facebook.com$replay$
What(is(expected( What(the(tools(captured(

Internet Archive
public, aggregated
Archive.today
public, aggregated
Foo Archives
public, non-aggregated
My web archive
pr...

Internet Archive
public, aggregated
Archive.today
public, aggregated
Foo Archives
public, non-aggregated
My web archive
pr...

Sample Access
Patterns

OR$
TimeMap
HVDS(PresentaFon( 20(

•  More mementos from a superset of sources
TimeMap
HVDS(PresentaFon( 21(

•  Patterns 1 and 2 are status quo
– provided by framework
•  Querying web archives currently only
considers public web co...

•  Functional superset of (MA)
•  Can act as intermediary client to relay MA
results to ultimate user
•  Allows just-in-ti...

MY$CAPTURES$
MY$BANK$CAPTURES$
Various(public(web(archives(
My(web(archives(
HVDS(PresentaFon( 24(

MY$CAPTURES$
MY$BANK$CAPTURES$
100(
30(
10(
HVDS(PresentaFon( 25(

MY$CAPTURES$
MY$BANK$CAPTURES$
100(
30(
10(
HVDS(PresentaFon( 26(

MY$CAPTURES$
MY$BANK$CAPTURES$
NOT$AGGREGATED$
NOT$AGGREGATED$
100(
30(
10(
140(
HVDS(PresentaFon( 27(

HVDS(PresentaFon( 28(

HVDS(PresentaFon( 29(

Access(via(the(Meta(Aggregator(
(
MY$CAPTURES$
MY$BANK$CAPTURES$
100(
30(
10(
140(140(
HVDS(PresentaFon( 30(

MY$CAPTURES$
MY$BANK$CAPTURES$
Access(via(the(Meta(Aggregator(
…allows(our(archives(to(be(included(
100(
30(
10(
15(
140(1...

MY$CAPTURES$
MY$BANK$CAPTURES$
100(
30(
10(
15(
140(155(
155(
155(
HVDS(PresentaFon( 32(

MY$CAPTURES$
MY$BANK$CAPTURES$
…(
Bob’s$public$
CAPTURES$
The$organizaLon’s$
public$CAPTURES$1$
The$organizaLon’s$
public$...

•  Allow dynamic and JIT set of archives
•  Superset can be recursively constructed
•  Sets can be shared
My public captur...

HVDS(PresentaFon( 35(

•  Regulates access to Private Web
Archives (PWAs)
•  Acts as token authorizer
•  With correct credentials, relays results...

MY$CAPTURES$
37(
MY$BANK$CAPTURES$
GET(TOKEN(for(PWA(
Key:(abcd1234(
HVDS(PresentaFon(
100(
30(
10(
3!captures!
10,000!cap...

MY$CAPTURES$
38(
MY$BANK$CAPTURES$
GET(TOKEN(for(PWA(
Key:(abcd1234(
HVDS(PresentaFon(
100(
30(
10(
3!captures!
10,000!cap...

MY$CAPTURES$
MY$BANK$CAPTURES$
ACCESS(OK(
Token:(4f33c64(
100(
30(
10(
3!captures!
10,000!captures!
HVDS(PresentaFon( 39(

MY$CAPTURES$
MY$BANK$CAPTURES$
GET(mementos(for(URI(
Token:(4f33c64(
100(
30(
10(
3!captures!
10,000!captures!
HVDS(Presen...

MY$CAPTURES$
MY$BANK$CAPTURES$
GET(mementos(for(URI(
Token:(4f33c64(
100(
30(
10(
3!captures!
10,000!captures!
HVDS(Presen...

MY$CAPTURES$
MY$BANK$CAPTURES$
Token:(4f33c64(
OK(
GET(mementos(for(URI(
GET(mementos(for(URI(
100(
30(
10(
3!captures!
10...

MY$CAPTURES$
MY$BANK$CAPTURES$
Token:(4f33c64(OK(
Returning(mementos(
Return(mementos(
For(URI(
100(
30(
10(
3!captures!
1...

MY$CAPTURES$
44(
MY$BANK$CAPTURES$
TimeMap
TimeMap
TimeMap
HVDS(PresentaFon(
100(
30(
10(
3!captures!
10,000!captures!
140...

MY$CAPTURES$
45(
MY$BANK$CAPTURES$
TimeMap
TimeMap
TimeMap
HVDS(PresentaFon(
100(
30(
10(
3!captures!
10,000!captures!
10,...

MY$CAPTURES$
46(
MY$BANK$CAPTURES$
TimeMap
HVDS(PresentaFon(
100(
30(
10(
3!captures!
10,000!captures!
10,143!captures!

...
, <http://web.archive.org/web/20150228155703/https://facebook.com/>;rel="memento";
datetime="Sat, 28 Feb 2015 15:57:03...

...
, <http://web.archive.org/web/20150228155703/https://facebook.com/>;rel="memento";
datetime="Sat, 28 Feb 2015 15:57:03...

...
, <http://web.archive.org/web/20150228155703/https://facebook.com/>;rel="memento";
datetime="Sat, 28 Feb 2015 15:57:03...

...
, <http://web.archive.org/web/20150228155703/https://facebook.com/>;rel="memento";
datetime="Sat, 28 Feb 2015 15:57:03...

MY$CAPTURES$
51(
MY$BANK$CAPTURES$
GET(mementos(for(URI(
Token:(4f33c64(
GET(mementos(for(URI(
Token:(c5463b4(
GET(TOKEN(f...

HVDS(PresentaFon( 52(
MY$BANK$CAPTURES$
Linda’s$Private$
Captures$
Bob’s$Private$
Captures$
GET(TOKENs(for(PWAs(
Key:(abcd...

HVDS(PresentaFon( 53(
MY$BANK$CAPTURES$
Access(OK(
Token:(7790ca(
Access(OK(
Token:(b0b01b(
ACCESS$
DENIED$
Linda’s$Privat...

HVDS(PresentaFon( 54(
MY$BANK$CAPTURES$
GET(mementos(for(URI(
Token:(7790ca,((Archive:(My(
Token:(null,(Archive:(Linda$
To...

•  Preserve Private Web Content
HVDS(PresentaFon(
•  Simulate & Quickly Deploy
Private Web Archives
•  Interface with New ...

•  Background research on state-of-the-art
•  Exploring use cases
– Both existing, anticipated, and fabricated
•  Resistin...

•  Why?
– No means exists to integrate private and public
web archives.
•  How to Evaluate?
– Does this framework fit real...

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