This is a collection of things I've written; theses, overheads for talks, articles, papers and the like. Most are in pdf format, so you might need to download Acrobat Reader to read them. (They run from most recent to least recent.) I also have a more formal looking publications list.

- The slides from a presentation at ICC 2015 about the operation of the PLC priority resolution mechanism in practice. It turns out you can do some pretty strange things to the tone map mechanism!
- Asad and Zakia's cool idea for using index coding in datacenters.
- The University made a video of me talking about the summer time clock changes, and George Hook also asked me a few questions about it.

- Some slides from a short presentation to the IEEE Study Group on Security, Reliability, and Performance for Software Defined and Virtualized Ecosystems.
- Karl and I did some calculations on power usage in Bitcoin.
- A more detailed paper considering how to capture could interact with the MAC in 802.11.
- The slides from the recent results session at ISPLC 2014. These relate to some interesting results we saw when modeling the PLC MAC, which also seem to have some practical side effects.
- A paper by Cristina and myself simulating the performance of the priority resolution mechanism in PLC. Presented at ISPLC 2014.
- Slides for a seminar that I gave in NUIG about guessing passwords.

- Brad and I had a look at the question, "Does putting a femtocell in your house increase or decrease your RF exposure." Our attempt to answer the question is in this paper.
- I'm curious to know what happens if I link to an encrypted word document and an unencrypted word document from here.
- The FLAVIA project has just wrapped up. The Wireless MAC processor which was developed as part of the project is quite cool.
- Cristina, Boris, Jaume and I've written a short paper on applying some of the learning MAC protocol ideas to beaconing in sensor networks. Cristina presented this as a poster at WoWMoM 2013.
- Hessan has built a cool demo of the WiFi policing system, which he presented at WoWMoM 2013. There is also a short writeup of the system.
- A fun paper with Niall and Darren about what you can learn by snooping on the backhaul of a femto in a very unobtrusive way. I presented this at the Traffic Monitoring and Analysis Workshop at INFOCOM 2013. The slides have some extra plots included that we couldn't fit in the paper.
- A paper on the cost to quality of doing a reinvite to change codec during a call, and how you might manage that cost. Work with Haytham, Mohamed, Brendan, Pat and Jonathan.
- A paper with Haytham, Jonathan and Pat on predicting measures of VoIP quality.
- A talk at the HEAnet conference about Industry/Academic interactions.

- Slides from a talk at Dunsink about time keeping.
- A paper with Wunan about how collision-free MAC schemes might perform when there were some errors in the slot counting part of the MAC. Slides are also available.
- This paper with Josh is about trying to identify hash functions based on their collisions. The Slides are also available.
- A paper with Minyu, Doug and Ken about how to apply the learning ideas from our channel allocation algorithm to slot allocation. The ideas follow on from some papers by Boris, Jaume and Cristina about L-BEB.
- This paper considers what might happen in WiFi if you tried to cause the capture effect to reduce collisions. This was work with Paul and Hanghang, presented at WoWMoM.
- Some observations of the leap second in 2012.
- A paper that describes a way to do rate control for 802.11, which tries to do the right thing when faced with congestion and/or bad channels.
- A paper at the WWW 2012 conference about how passwords are distributed. Slides are also available.
- A paper with Peter, Doug and Ramana about how to allocate channels in a WiFi network, when the networks can't talk to each other.
- A paper about how the scheduled part of the powerline MAC might behave with voice. This was presented at the ISPLC 2012 conference. Slides are also available.

- A paper on dynamically adjusting the buffer size in 802.11. Should be of interest to people concerned about buffer bloat.
- A group of us worked on a paper paper on fairness in WiFi meshes.
- My slides from a talk at Ignite NUI Maynooth.
- My slides from a talk at Dublin Ignite 8 where I tried to measure the speed of light. The video is also available.
- A short paper on games and competing traffic at the NetGames 2011 conference with Hanghang and Dmitri. There's also a poster.
- A submission submission to the 2011 Copyright Review Committee.
- A paper with Ian and Doug about how to keep cheating stations in line in 802.11.
- A paper with Kaidi and Ken about how the 6Mbps rate in 11g actually seems to be less robust than 11Mbps.
- A paper about doing some tests with a powerline communications testbed paper with Brad.

- Slides from a talk to the UCD Mathsoc about maths and wireless networking.
- Slides from a Dunsink Observatory open night talk, about time (as usual!).
- My slides from a talk at MACOM 2010 about some of the assumptions made when modeling 802.11 networks. Based on a paper with Ken and Kaidi which is to appear in Transactions on Networking.
- My slides from a talk at the conference on Computational Intelligence and Games about detecting cheaters in online gaming. This is work with Dmitri and Laetitia and the paper is also available.
- My slides from a talk at Google about TCP tweaking and tuning. There's also a bit about the other research going on at the Hamilton Institute.
- A paper with Kaidi and Ken about the assumptions used in a lot of 802.11 models. To appear in Transactions on Networking.
- My slides from a talk at Dublin Ignite 4 about seeing the wood for the trees. The video is also available on YouTube.
- A paper with Hanghang and Dmitri about Quake 4 traffic in a WiFi network.
- A paper about using LDPC codes with variable power allocation, with Vijay and Hanghang.
- Some You Tube videos about using Dummynet on FreeBSD.

- An article for the IRTS's Echo Ireland about Juan Domenech Fernandez's homebrew software radio project.
- Another talk at Dunsink Observatory Open Night about time.
- Slides from a quick talk about software radio at the Ignite Dublin 1 session organsied by Conor Houghton. The video is available also.
- Some more slides from EuroBSDcon 2009's WIP session. Kindly presented for me by Tony Finch in just 90s.
- Some slides from EuroBSDcon 2009 about the work Josh and I did on flow lookup for ipfw.
- A paper about fairness and mesh, extending some earlier work.
- IBEC's TIF Council had a meeting on IPv6, at which I was invited to speak. My slides are available.
- Slides and the paper about what queueing delay tells you about buffer occupancy in WiFi networks. With Doug and Ian. Presented at the TMA Workshop at Networking 2009.
- Slides for a talk about the amount of energy put out by 802.11 Networks at the Association is the Association of Physical Scientists in Medicine. Details are in our Health Physics paper.
- Slides for a talk about FreeBSD given at Skycon'09.
- Slides for a rather silly talk about destroying disk contents for the sysadmin's guild.
- A talk to the mathsoc about mathematical modeling of WiFi.
- Slides from my talk at the Irish IPv6 Summit. Links to slides and video for all the speakers are available on the agenda.
- A little whinge about IBEC's statistics.
- Observations of the leap second introduced at the end of 2008.

- Morning Ireland asked me to explain why the New Year was to be delayed.
- A paper written with Josh Tobin, from EC2ND comparing different ways to look up IPv6 flows. The slides are available too.
- Another talk at Dunsink Observatory Open Night about time.
- Some instructions for using the IPv6 address analysis scripts that I used for producing this paper.
- A paper about which of the assumption often used in wireless modeling actually hold.
- Slides from a talk about TCP and wireless at UCD's Wireless Future workshop.
- I gave two talks at HEAnet's IPv6 and IP addressing management Workshop. One on firewalling IPv6 and one on IPv6 deployment in TCD. Note that videos of the talks are available from the workshop page.
- A paper at the RIA Colloquium on Emerging Trends in Wireless Communications about measuring channel quality. The poster is also available.
- A paper with Tianji, Doug and Ramana about flow fairness in wireless mesh networks.
- A paper showing some of the things you can learn by looking at IPv6 addresses. Please let me know if you're interested in trying out the code. The paper will be presented at PAM 2008. The slides are available.
- A paper about where TCP timeouts actually seem to come from in WiFi networks. This will be presented at WinMee 2008. The slides are also available.
- A paper with Ramana and Doug about how to get certain types of fairness in multihop 802.11 networks with TCP. To appear in Comms Letters.
- Not written by me, but by Ian Dangerfield, who did a thesis on Wireless Network Measurement with me.
- A paper with more details on how to aggregate frames for high physical rate wireless LANs. To appear in Transactions on Networking.

- Slides from one of the SAGE-IE lightening talks on the crazy traceroute (ICMP quotations) project. A paper and poster have some more details.
- Another talk at Dunsink Observatory Open Night about time.
- A paper with Domenico, Doug and Dina about how well some of the 802.11 error measures we'd been considering work in practice.
- A paper for Mathematical Methods of Operations Research with Ken about what happens when you make the packets you are queueing distinguishable.
- A letter to the editor of ;login: based on things that came to mind after reading the August 2007 editorial.
- Slides to my SAGE-IE talk on my limited experience interviewing sysadmins. Unfortunately the projector didn't work out, so these slides are new even to people who attended the talk.
- Unfortunately, I didn't manage to find a reference to "hoodie" in time for the BBC wordhunt program. However I did manage to find this cartoon (drawn by Emma Haugh) from a school magazine later. I sent it in and it used by the OED. (From the acknowledgments it seems someone else beat me to poll dance.)
- My effort to contribute to the the BBC wordhunt using Google Groups to search Usenet. I've done something similar for references to early Irish web pages.
- A paper from WiNMee about experimentally assessing how voice capacity of 802.11 networks can be improved by choosing the right buffering and TXOP. Slides are also available.
- A paper on checking out if the assumptions used to model 802.11 seem to match up with the real world. This was presented at PAM 2007. The slides are also available.
- A study of ICMP quotations by Matthew Luckie and myself. From PAM 2007. The poster is also available.
- More work on the location of 6to4 relays routers with Mónica Domingues and Carlos Friaças.
- A time talk for the nice people at the UNLIKELY SOCIETY.
- A letter to the Irish Times pointing out some front page news is actually a combination of old news and advertising.
- Slides from a quick intro to IPv6 for Stefan Weber 2BA5 CS class.

- Some slides about difference equations from a Irish Maths Olympiad training session in NUIM.
- Slides from an applied maths seminar in UCC. The slides are based on a set by Ken Duffy.
- A paper on estimating the Hurst parameter for long range processes, to appear in Physica A. Also a note on a similar topic in Computer Communications Review.
- A paper on how one might estimate the packet error rate in 802.11 from the MAC layer.
- A talk at the ILUG AGM about Network Research I'm involved in and Linux.
- A talk at Dunsink Observatory Open Night about time.
- Probably the final update on the AAAA lookup problem given at RIPE 53 (presented by Dave Wilson on my behalf). The slides mention this document.
- An answer sent to the New Scientist's Last Word page in response to a question about ancestors.
- A paper on an interesting relationship between buffering and throughput in 802.11 networks.
- A paper about how to combine aggregation and fragmentation in high speed WLANs, presented by Tainji at WoWMoM 2006.
- Will people never learn how many week days are adjacent to the weekend!
- Three papers on wireless. The first about measuring the delay performance of voice was presented at WiNMee and the slides are available. The second is about extending some of the one-hop wireless models to multi-hop networks. It was presented at RAWNET. The third is about extending nonsaturated 802.11 modeling to 802.11e. This was presented at WiOpt, the slides are available.
- An article about how our web server was flooded, that links in with some of the NTP abuse stories. This article originally appeared in USENIX ;login: April 2006, Volume 31, Number 2.
- Slides from a talk about FreeBSD security features that I gave at the UKUUG spring conference.
- Slides for a talk given by Niall and me at SAGE-IE about DNS. There were lots of interesting comments during the talk, some of which are listed at the end of the slides (starting on slide 33).
- Slides for my talk about
*Time in the Modern World*as part of the Light & Time lecture series at the National Museum. (In the questions after this talk I was asked did we have Double Daylight Savings. I said that I thought that we did, but I may have been mistaken as at least one book said that Britain did but Ireland didn't. I'll check further.) - Slides from a seminar at the Computer Lab in Cambridge about measurement experiments with WLAN.
- Notes on the leap second introduced at the end of 2005 (there are also some other time related notes).

- Slides and the paper from EC2ND conference about using the IPv6 flow label for firewalling, written by Orla McGann and me.
- A paper with Doug, Peter and Anthony on using 802.11e to improve TCP performance.
- Slides for a talk about TCP tuning and research to Amazon in Dublin.
- Slides for a talk about wireless to DUCSS.
- Slides for a fill in talk about congestion control at the HEAnet conference. (Generated from Powerpoint, so they're a bit big.)
- Slides and handouts for a tutorial at the HEAnet Conference by Niall Murphy and Dave Wilson. We'd prepared the tutorial with the intention of the three of us giving it, but I had to give the talk above.
- Text and slides on the relationship between guesswork and entropy from the IT&T conference.
- An article
in
`;login:`

about FreeBSD security features. - Slides from my talk at the HEAnet workshop on IPv6.
- Slides from our presentation at the SIGCOMM E-WIND workshop. Our paper is available too.
- I gave a talk at the DNS OARC workshop about acting as a secondary to the root zone. Slides are available.
- Slides from a paper at Wirelesscom'05 about increasing the number of voice calls that can be supported at a wireless access point.
- Not written by me, but Orla McGann, who did a Master's thesis on IPv6 packet filtering with me.
- Another update on the AAAA lookup problem given at RIPE 50 (presented by Dave Wilson on my behalf).
- A question about rhubarb sent to the New Scientist's Last Word page.
- An article in Cisco's Internet Protocol Journal about the AAAA lookup problem. (Volume 8, Issue 1, March 2005).
- A preprint of a paper about how to model nonsaturated traffic in 802.11 networks. A revised version of the paper is to appear in IEEE Communications Letters (Vol. 9, No. 8, August 2005).
- A preprint of a paper about modeling competing stations in 802.11 for the Resource Allocation in Wireless Networks conference in Trento, April 2005.
- Niall Murphy and I have written a book about IPv6 Deployment/Network Administration published by O'Reilly. There's also a blog to go with the book.

- I helped with the simulation code and results for this DIAS technical report with Ken, Eugene, Yuri and Nikita.
- A lunchtime talk to the HMI about time.
- A quick introduction to DNS.
- Slides from a short talk about the use of wavelets to detect long range dependence in network traffic.
- Slides giving an update on the AAAA lookup problem at RIPE 49.
- A preprint of a paper about studying the solutions of dilation equations by looking at one end of them. This is to appear in the International Journal of Wavelets, Multiresolution and Information Processing (Vol. 3, No. 1, March 2005).
- Slides from a short talk about layering and encapsulation in networks, in order to explain what port scanning is.
- Slides for a talk to the RIPE DNS working group about the extent of the problem with AAAA (IPv6) DNS lookups.
- My submission to the Commission on Electronic Voting regarding the secrecy and accuracy of the electronic voting system proposed for use in Ireland's local and European elections. Some of the other submissions have been collected by the ICTE.
- Slides from a talk about NTP to SAGE-IE.

- Slides from a short talk at the HEAnet networking conference on the basics of the IPv6 protocol.
- A technical report on what happens if you tell your name server to act as a slave for the root zone, rather than using the traditional hints method. An updated version of this was presented at the Internet Measurement Conference 2004.
- Slides from a talk at RIPE 46 about IPv6 deployment.
- The slides from a short talk to the IAHPC about IPv6.
- Slides for a talk on forensics given at SAGE-IE.
- A talk about IPv6 deployment in TCD given as a Doolin Technologies tech talk.
- I wrote a section on randomness for the FreeBSD random device man page, in order to point out that randomness means different things to different people.

- An updated version of my Geometry Tidbits talk, from the 2002 IMSA meeting.
- My slides from a talk on 802.11 (wireless) to SAGE-IE.
- I gave a revamped version of my time talk for National Science Week.
- A talk on the links between maths and computers for the TCD Maths and Physics open day.
- Some correspondence with the Economist about a poster of theirs.
- A report on 802.11b networking in Dublin written with Niall Murphy and Ken Duffy. We also have a map showing the locations of the locations of the networks we found. Originally this report lived on Engima's server.
- The paper Ian and I wrote for the Usenix ATC, about filesystem optimisations in FreeBSD. The overheads for the talk are available. I also gave a variation of the talk at the ILUG AGM, the overheads are also available. (The overheads ended up upside-down for reasons I don't quite understand - if anyone knows now to flip Postscript or PDF files, please let me know...) The extra material relating to the paper is available from my CNRI page.
- A paper
by Wayne Sullivan and me about the links (or lack thereof)
between
*Guessing and Entropy*. The mathematical results of this paper appear in IEEE Transactions on Information Theory (Vol. 50, No. 3, March 2004).

- Overheads from a talk at the 2001 DIAS Winter Symposium about the link between entropy and guess work. I also gave updated versions of this talk in NUI Galway and DCU.
- Overheads from my presentation at BSDconEurope 2001 about recent enhancements to UFS.
- An answer to one of the `Last Word' questions in the New Scientist.
- Overheads from a talk about time-keeping given to the TCD Astronomy, Maths and Physics societies.

- Overheads from a talk given at the
Irish Maths' Students conference in Maynooth and again to
the TCD Mathsoc. The talk was about
*Simple Mathematics and Computer Graphics*, so be warned that the overheads are quite big 'cos they contain various examples of computer graphics. - My Ph.D. thesis which was about solving dilation equations.
- Overheads from a talk,
*Self Affine Tiles and Dilation Equations*, at the DIAS Easter Symposium. - Overheads from a talk about the Open Source thing, given to secondary school students at the Maths and Physics open day in TCD.

- Overheads from a short talk given at
the DIAS Christmas Symposium on
*2- and 3-Refineable Functions*. - A draft of a paper published in the
Journal of Fourier Analysis and Applications (Volume 8,
Issue 3, 2002) on
*Solutions of Dilation Equations and Fourier-like Transforms*. - The courseware from when I taught part of the 561 course (Computer Architecture for Scientific HPC).
- A short report describing an OpenMath to LaTeX converter which I wrote for Richard Timoney as part of the OpenMath ESPRIT project.
- A paper published in the Irish
Mathematical Society Bulletin (Number 42) describing
*An Unusual Construction of the Fourier Transform*.

- Overheads from a talk to the TCD Mathsoc about randomness.
- An article for the Irish Times advocating free unix.
- An article for the TCD computer newsletter about various versions of free unix.
- A proposal and some notes for a two day Unix Admin tutorial which I gave.
- Overheads for a talk given at Charleville Library as part of Science week in 1998. It was supposed to be about the dark side of the Internet, but I ended up talking to a load of primary school children who were supposed to be doing their homework.

- My M.Sc. thesis entitled
*Fourier Analysis, Multiresolution Analysis and Dilation Equations*. - Overheads for a introduction to wavelets given as a society talk at NUI Maynooth.
- Overheads for a talk on the history of the Internet, given to secondary school students as part of the Maths and Physics open day in TCD.
- Overheads for a talk on constructing the Fourier transform at the 1997 DIAS Easter symposium.
- Overheads for a talk I gave at the Mathematics Intervarsitys describing Fourier analysis and wavelet analysis.

- Some notes on networking in Java that was part of a 1 day summer course run by Tim Murphy. I believe networking in Java has changed a little since.

- The report describing a ray-tracer I wrote as part of a final year course.

- My project for leaving cert music.