I very much enjoy supervising and mentoring students.
Since graduating in 2006, I have been supervising and/or
assisting in the supervision of students at the University
of Saskatchewan (Canada), University of Calgary (Canada),
IIT Delhi (India), NICTA (Australia), and
Linköping University (Sweden).
I am looking for self motivated students with interest
in computer networks, content delivery, multimedia networking (including HAS/DASH, VR, AR, mixed reality),
network security, distributed systems, performance/systems modeling,
or data mining/analysis.
Please contact me if you are interested in doing a project or thesis in one of these topics.
(Link to 2018 thesis examples
Graduated PhD Students at LiU
Vengatanathan Krishnamoorthi (graduated Mar. 2018):
Vengatanathan is co-supervised with Nahid Shahmehri. His research on proxy-assisted
HTTP-based adaptive streaming (HAS) appeared in IEEE MASCOTS 2013
His work on branched video (also sometimes called "nonlinear" or "multipath" streaming) won the best paper award at the
ACM SIGCOMM workshop FhMN 2013 (pdf).
Our ACM Multimedia 2014 (pdf) paper shows how the playback
quality for branched video can be optimized using branch-aware prefetching policies, while ensuring ensure
seamless playback without playback interruptions.
Our ACM Multimedia 2015 (pdf) paper presents
a novel bandwidth-aware prefetching solution for proactive multi-video preloading and improved HAS performance.
Vengatanathan's work also includes the design and implementation of an optimized interactive streaming solution
in which users can select among many alternative viewpoints, published in IEEE Trans. on Multimedia, July 2017
and the BUFFEST framework for predicting buffer conditions and real-time requirements of HTTP(S) adaptive streaming clients,
published in ACM MMSys 2017
Other joint publications include works at
IEEE ICC 2017 (pdf) and
ACM MMSys 2018 (pdf).
Rahul Hiran (graduated Dec. 2016):
Rahul was co-supervised with Nahid Shahmehri and Patrick Lambrix. His research proposes new
collaborative distributed security protocols and uses measurements to analyze BGP security.
His work characterizing the China Telecom incident on April 8, 2010, appears in
PAM 2013 (pdf),
his distributed alliance framework for collaborative BGP monitoring and prefix-based security,
called PrefiSec, is published at ACM WISCS @ CCS 2014 (pdf),
and his CrowdSec paper is published at IEEE CNS 2015 (pdf).
Finally, scale, size, and locality aspects of a wide range of collaborative BGP security mechanisms
are evaluated in his most recent IFIP Networking 2016 paper (pdf).
Anna Vapen (graduated Sept. 2016):
Anna was co-supervised with Nahid Shahmehri. Her research is on Web authentication and
federated identity management.
A large-scale measurement study of the identity management landscape appears
in PAM 2014 (pdf),
and other exciting findings about the privacy risks and information sharing
in this landscape are published at IFIP SEC 2015 (pdf).
Her shorter poster paper of this work also won an outstanding poster award
at ACM CODASPY 2015 (pdf).
A longitudinal analysis was presented at the NDSS workshop UEOP 2016 (pdf),
and a high-level overview about the third-party identity management landscape can be found in
our Internet Computing (pdf) article published 2016.
Internship Students, Postdocs, and Researchers at LiU
Tatiana Polishchuk (postdoc, 2015):
During her postdoc Tatiana worked on optimization problems
related to our new HAS-based content delivery techniques for tomorrow's streaming services.
This work is published in IEEE Transactions on Multimedia
and extends our prior works presented at ACM Multimedia 2014
ACM Multimedia 2015 (pdf).
Benoy Varghese (visiting PhD internship student, 2014):
During his internship Benoy
primarily worked on experiments and modeling of low-power server and proxy systems.
Some of this work was published
at IGCC 2014 (pdf).
Cyriac James (researcher, 2013):
During this period,
Cyriac did research on the impact that a router implementing
energy-aware adaptive link rate policies
has on neighboring routers.
Some of this work appears in ACM/SPEC ICPE 2015
Cyriac is now a PhD student at University of Calgary.
Vengatanathan Krishnamoorthi (researcher, 2012): During this period, Vengatanathan
worked on proxy-assisted HTTP-based adaptive streaming (HAS). The work appeared in
IEEE MASCOTS 2013 (pdf)
and Vengatanathan continued this work as a PhD student in the group (now graduated).
Youmna Borghol (visiting PhD internship student, 2011): During her internship Youmna
primarily worked on content popularity dynamics of YouTube videos. This work was published
at ACM SIGKDD 2012 (pdf).
Dr. Borghol is now a Data Analytics Manager at MediaCom, Sydney, Australia.
Ajay Gopinathan (postdoc, 2011): During his postdoc Ajay worked on
spectrum auctions (pdf) and content replica selection
The replica selection work extends our prior work
to consider optimized caching and request routing in cloud-based content delivery systems;
published at IFIP Performance 2014
is now with Google, Mountain View, CA, USA.
External PhD Students
I have also had the pleasure to work with some excellent external PhD students.
This list highlights students for which our joint works have been published
and become a major part of their thesis elswehere.
For these collaborations I am grateful to my external collaborators,
Sebastien Ardon (NICTA, Australia),
Martin Arlitt (HP labs, USA),
György Dan (KTH Royal Institute of Technology, Sweden),
Derek Eager (University of Saskatchewan, Canada),
Diwakar Krishnamurthy (University of Calgary, Canada),
Zongpeng Li (University of Calgary, Canada),
Anirban Mahanti (NICTA, Australia),
Carey Williamson (University of Calgary, Canada).
Raoufehsadat Hashemian (ongoing PhD @ University of Calgary, Canada):
Raoufeh has done some really cool work on multicore Web servers
that help improve the utilization of the servers.
Joint publications related to her thesis appeared in
ACM/SPEC ICPE 2013 (pdf)
CCPE 2014 (pdf),
ACM/SPEC ICPE 2017 (pdf)
Benoy Varghese (ongoing PhD @ NICTA, Australia):
Benoy's thesis focuses on experiments and modeling of low-power server and proxy systems.
Joint publications related to his thesis appeared in
IGCC 2014 (pdf).
Aniket Mahanti (PhD, 2012 @ University of Calgary, Canada):
Aniket's thesis characterized the one-click hosting landscape.
Joint publications related to his thesis appeared in
IFIP Performance 2011 (pdf),
IEEE MASCOTS 2012 (pdf),
IEEE LCN 2012 (pdf), and
IEEE Network (pdf).
After graduation, Dr. Mahanti took a job as an Assistant Professor at the
University of Auckland, New Zeeland.
Youmna Borghol (PhD, 2012 @ University of New South Wales, Australia):
Youmna's thesis focused on popularity dynamic in YouTube.
Joint publications related to her thesis appeared in
IFIP Performance 2011 (pdf) and
ACM SIGKDD 2012 (pdf).
Dr. Borghol is now a Data Analytics Manager at MediaCom, Australia.
Highlighted Students with Final Year Research Project/Assignments
I have also had the pleasure to work with some excellent final year students.
The following list highlights students for which our joint works have been published
and become a major part of their thesis either here at Linköping University (LiU) or elsewhere.
In addition to the above student theses, I have very much
enjoyed working with many other excellent students. While all have done
interesting work, this list only highlight works that have been published.
Mathias Almquist, Viktor Almquist (MSc, 2017 @ LiU):
Mathias and Viktor designed and performed a 360-degree video streaming study.
An extension of this work is published and presented at ACM MMSys 2018
Here, we characterize and analyze the prefetch aggressiveness tradeoff in 360 video streaming,
using both measurements and an optimization framework.
Carl Nykvist, Linus Sjöström (BSc, 2017 @ LiU):
Carl and Linus used measurements to characterize the server-side adoption of
Certificate Transparency (CT).
An extension of this work was published and presented at PAM 2018
Josef Gustafsson (MSc, 2016 @ NORDUnet):
Josef implemented a Certificate Transparency (CT) monitor and
characterized the emerging CT landscape.
An extension of this work was published and presented at PAM 2017
Here, we provide the first large-scale characterization of the CT landscape.
Other joint work with Josef have been published at
IEEE ICC 2017 (pdf)
PAM 2018 (pdf).
Georgios Rizothanasis (MSc, 2015 @ LiU):
George developed timing-based techniques to identify
user actions from within the large amount of HTTP(S) traffic (dominated by requests not explicitly made
by the clients) seen in modern networks. The performance was evaluated within a rigorous and automated
evaluation framework that he also developed. This work is presented at IEEE LCN 2016
Joel Purra (MSc, 2015 @ .SE):
Joel developed a measurement methodology and performed analysis of the third-party tracking usage.
His IEEE LCN 2016 (pdf) paper highlights the current state of the
third-party tracking landscape, including differences across tracking service classes, domain
categories, and the organizations that owns the tracker services.
Tova Linder, Pontus Persson, Anton Forsberg and Jakob Danielsson (BSc, 2015 @ LiU):
Tova and Pontus
characterized the bandwidth variations observed in measurements from Bredbandskollen (the most popular speedtest service in Sweden)
and evaluated the prediction accuracy that such crowd-sourced datasets can provide.
Anton and Jacob
evaluated the performance improvements that such predictions can provide mobile clients.
This work appears at IEEE/IFIP WONS 2016 (pdf).
Alberto García Estévez (BSc, 2013 @ LiU):
Alberto designed, implemented, and evaluated a geo-smart scheduler
and a geo-location-aware emulation framework for
performance evaluation of mobile applications.
This work appears at IEEE/IFIP WONS 2014 (pdf).
M. Aminul Islam (MSc, 2013 @ University of Saskatchewan, Canada):
Aminul characterized and modelled popularity dynamics of user-generated content.
This work appears at IEEE MASCOTS 2013 (pdf).
Patrik Bergström (BSc, 2012 @ LiU):
Patrik implemented a novel proof-of-concept HAS-based player
for nonlinear multipath video streaming. This work later received the best paper award at
the ACM SIGCOMM workshop FhMN 2013 (pdf).
Song Zhang (MSc, 2011 @ University of Calgary, Canada):
Song's thesis experimentally validates some of our works on dynamic bundling in peer-to-peer systems
Joint works appeared in IEEE IWQoS 2010 (pdf) and
IEEE LCN 2012 (pdf).
Siddharth Mitra (MTech, 2010 @ IIT Dehli, India):
Siddharth characterized the popularity dynamics in YouTube. His thesis won a best
thesis award at IIT Dehli and joint works where published in
ACM Transactions on the Web (pdf),
and IFIP Performance 2011 (pdf).
Trinabh Gupta and Sanchit Garg (BTech, 2009 @ IIT Dehli, India):
Trinabh and Sanchit characterized the evolution of a social aggregation network.
Their thesis won a best thesis award at IIT Dehli and joint publications appeared
in ACM IMC 2009 (pdf) and
AAAI ICWSM 2009 (pdf).
Trinabh later did his PhD at University of Texas at Austin and is now a faculty member at
University of California Santa Barbara (UCSB).
External Examiner and/or Thesis Committee
Linus Åkesson (Lic, 2016) @ Lund University, Lund, Sweden
Manfred Dellkrantz (Lic, 2016) @ Lund University, Lund, Sweden
Ekhiotz Jon Vergara (PhD, 2016) @ Linköping University, Linköping, Sweden
Ahmed Ali-Eldin (PhD, 2015) @ Umeå University, Umeå, Sweden
Adele Lu Jia (PhD, 2013) @ Delft University of Technology, Delft, the Netherlands
Tomas Kupka (PhD, 2013) @ Simula and University of Oslo, Oslo, Norway
Completed Final-year Thesis Students (at companies, as part of courses, or research)
Josef Gustafsson (MSc, 2016 @ NORDUnet, research project)
Georgios Rizothanasis (MSc, 2015 @ LiU, research project)
Nicklas Blomqvist and Björn Bylund (MSc, 2015 @ Ericsson research)
Joel Purra (MSc, 2015 @ .SE, research project)
Tova Linder and Pontus Persson (BSc, 2015 @ LiU, research project)
Anton Forsberg and Jakob Danielsson (BSc, 2015 @ LiU, research project)
Karl Andersson and Marcus Odlander (BSc, 2015 @ LiU)
Erman Döser (MSc, 2014 @ Ericsson research)
Tim Hedlund (MSc, 2014 @ Ida Infront)
Robert Nissa Holmgren (MSc, 2014 @ Spotify)
Elias Kärnsund and Jakob Bäcklund (BSc, 2014 @ LiU)
Johanna Thorheim and Anna Boyer de la Giroday (BSc, 2014 @ LiU)
Matteus Hemström and Anton Niklasson (BSc, 2014 @ LiU)
Milad Barsomo and Mats Hurtig (BSc, 2014 @ LiU)
Emmie Nilsek and Christoffer Olsson (BSc, 2014 @ LiU)
Fredrik Säveros (MSc, 2013 @ Attentec)
Anders Skoglund (MSc, 2013 @ LiU, research project)
Pavithra Velusamy Chandramohan (MSc, 2013 @ Sonos)
Alberto García Estévez (BSc, 2013 @ LiU, research project)
Carlos Fernández Fernández (BSc, 2013 @ LiU, research project)
Maryam Mehrabian (MSc, 2012 @ Ericsson)
Patrik Bergström (BSc, 2012 @ LiU, research project)
We are in the process of building a new high-caliber
research group which specializes in the design, modeling, and
performance evaluation of distributed systems and networks.
We are therefore looking for self motivated students
that are interested in doing a project or thesis in our group.
Please contact me if you are interested in doing a project or thesis with us.
Topics: Potential topics include, but are not limited to:
future streaming services (including HAS/DASH, VR, AR, mixed reality),
and data mining/analysis.
Much of my ongoing research contributes towards providing inovative and effective ways to disseminate
content and information for tomorrow's society.
There are of course many other candidate topics, which I would be happy to discuss in person.
You can also find some recent research papers on my website.
Methodologies: We will always try to use the best tools for the
problem at hand. Our research include a combination of
measurements, data analysis/mining, applied statistics,
analytic modeling, optimization,
simulations, system implementation and design, as well
as real-world experiments. We are looking for ambitious
students interested in applying one or more of these methodologies to improve and better understand systems.
Prospective thesis and graduate students:
I am always looking for self motivated and ambitious students.
If you fit the above description, please send me an email.
There are always bachelor and master's thesis projects avalible.
We are also constantly looking for good PhD candidates.
To indicate interest, you can send me an email with your CV, transcripts
(scanned, including grades and degrees, if applicable), and a cover
letter (in which you describe why you are a suitable candidate).
Any attachments should be in pdf format.
(Other formats will not be opened.)
PhD Candidates ("doktorander", in Swedish) should have a
MSc degree in Computer Science, Engineering, or other related
discipline. While a strong background in mathematics is a plus,
this is not a requirement. (See description of methodologies above.)
The primary requirement for these positions is that you have a genuine
interest in learning, discovering, and carefully exploring new things,
and have the ambition doing high-quality research.
PhD candidates are employed with a monthly salary.
There are thesis projects available for students interested
in any of the above topics or methodologies.
(Particularly strong or hardworking masters students can be
accepted/promoted into the PhD program.)
There are some thesis projects available for ambitious students.
Example Projects for BSc/MSc Thesis
There are some candidate thesis topics that I would be particularly excited finding
good students for (many of which are related to our ongoing research projects).
Rather than listing all these projects publically, I am happy
to sit down individually with suitable candidates and discuss such projects.
(For some projects, including the ones listed below, there are also some brief summary write-ups
that can be shared with students genuinely interested in doing a project.)
Below are some very brief example announcements for project we are hoping to find people.
Data mining project on Content Popularity Dynamics
This thesis would involve follow up work on our ACM KDD 2012
and would involve both data collection and analysis of datasets.
Multimedia project on Branched Video Streaming
This thesis would involve follow up work on our ACM SIGCOMM FhMN best paper award
) paper and our
ACM MM 2014 (pdf
For this project, preference would be given to a student
or that is a strong programmer so that he/she quickly can grasp the code/language.
As hopefully suggested from the above descriptions, there is the potential for
a wide variety of other candidate projects as well.
I encourage you to check out
my publication page for
example papers and topics that we actively research.
Some other example projects
Hockey interested and interested in data mining (or statistics)?
If this sounds like you please contact me. We have the perfect project for you!!
We also have other data mining and/or data analysis oriented projects.
- Interested in learning about the weaknesses of SSL and Web security? There is a very
interesting project for you! We also have a number of other security-related projects.
- Interested in analytic modeling or mathematics? This may be a great
opportunity to apply those skills to better understand how systems, networks,
and/or services work and should best be designed.
- We are looking for a student to help in the design and implementation of a
Planetlab demonstrator and teaching tools.