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geek-guides.com, elijah wright's weblog, beaucoup neat stuff, from the trenches


e-mail: elw@stderr.org

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  • circa 1993
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    These are a few of my favourite links.


    hacker emblem
           

    Thu, 25 Jun 2009

    thinks the --replace option to mysqldump is the be
    thinks the --replace option to mysqldump is the bee's knees.
    (link) [elijahwright]

    2009 permanent link

    Fri, 19 Jun 2009

    having a busy day.
    having a busy day.
    (link) [elijahwright]

    2009 permanent link

    @karlstolley i am very impressed with the #twitrhe
    @karlstolley i am very impressed with the #twitrhet page
    (link) [elijahwright]

    2009 permanent link

    Tue, 16 Jun 2009

    14-14-21 or bust.
    14-14-21 or bust.
    (link) [elijahwright]

    2009 permanent link

    Iran protest pictures - Iran is ready to change.
    Iran protest pictures - Iran is ready to change. http://ow.ly/epvr
    (link) [elijahwright]

    2009 permanent link

    Mon, 15 Jun 2009

    restaurant recommendation - "Double Dogs" in Bowli
    restaurant recommendation - "Double Dogs" in Bowling Green, Kentucky. Good place, we enjoyed very much yesterday.
    (link) [elijahwright]

    2009 permanent link

    Wed, 10 Jun 2009

    a bit perturbed at having lost all of the data on
    a bit perturbed at having lost all of the data on a 300GB hard drive. Fortunately, nothing terribly important on there.
    (link) [elijahwright]

    2009 permanent link

    Sun, 07 Jun 2009

    Told H her pants were on fire after she told a fib
    Told H her pants were on fire after she told a fib. Got her to look. Quite hilarious.
    (link) [elijahwright]

    2009 permanent link

    Mon, 12 Nov 2007

    OLPC and AoIR 8.0 slideshows
    Several folks have asked for slides from either the OLPC talk that I gave on Friday, or from AoIR several weeks ago.

    Both sets of slides (in multiple formats) are available from http://stderr.org/~elw/2007/
    (link) [elijahwright]

    2007 permanent link

    Mon, 10 Sep 2007

    animal rescue
    we are now fostering two needing-much-love animals here.

    1) Hera, an eight month old kitty, very skittish and non-people-adjusted.

    2) Darcie, an (I'm guessing) eight to ten year old female cocker spaniel.


    I should really post pictures, I guess. It is nice to have animals other than fish running around the house being friendly and playful. (These are very friendly animals, and so far I've had *zero* trouble with either - other than some minor toilet malfunctions, at least.)
    (link) [elijahwright]

    2007 permanent link

    calendar updates
    I spent a few minutes moving things from my mailbox onto the google calendar that I was using for departmental and SLIS-related events last spring.

    Anyone who's interested should be able to search at Google Calendar for "SLIS Doctoral Student Association" (or similar) and find it...

    In bulk, I calendared the events of SLIS DSA's "Friday Conversations", running this fall, as well as the talk dates that katy's lab sent out for their talks. RKCSI's dissertation support group is on there too; folks are meeting tomorrow to discuss meeting times for that, so I have nothing else there to calendar, yet.

    I like having things calendared, even if I don't make it to the events. Somehow it makes the world feel a little bit tidier, and I find that somewhat comforting...
    (link) [elijahwright]

    2007 permanent link

    tiger botia update
    the two tiger botia appear to have scared the bejeezus out of the nuisance snails in my smaller fishtank.

    I'm not seeing many of the mid-sized snails, anymore.

    We haven't managed to 'catch' the botia eating any snails, and we don't see broken shell pieces, either. It does seem, however, that there are fewer snails in the tank.

    The largest of the nuisance snails - the original, matriarch, snail - known derisively as "big momma" - has taken to burying herself quite deep in the gravel. I suspect that to be some sort of reaction to predation - she's never done that, before now.

    I wonder how many snails the two botia have eaten since introduction... it would be very interesting to know within an order of magnitude or so. But I simply just don't know....
    (link) [elijahwright]

    2007 permanent link

    Mon, 03 Sep 2007

    tiger botia (multiple)
    I've introduced two tiger botia into the smaller fishtank in hopes that they will devour the burgeoning hordes of Malaysian trumpet snails - a nuisance species. I counted about 30 of them on the surface the other night. [They're sort of nocturnal- they get active when it is dark. Counting them is one of those things you do after they've had several hours of prolonged darkness.] That was 30 that were sizable - there are vastly more of them in the tank, but they're either deeply buried or too tiny to easily see.

    Botia-variety fish are basically loaches. They get big. These two are about the size of a triple-A battery. If they get too big, I guess they'll have to go back to some pet store or another...
    (link) [elijahwright]

    2007 permanent link

    Fri, 24 Aug 2007

    greek mythology personality test


    Your Score: Dionysus


    33% Extroversion, 33% Intuition, 72% Emotiveness, 71% Perceptiveness




    Although deeply emotional, you are extremely lacking in self-knowledge. You are somewhat needy, and when bored, may become very hedonistic. Your life is a quest for meaning, above all else. You are most like Dionysus. You are primarily interested in serving others, but your efforts are almost always unappreciated. You aren't confrontational, you're often out of tune with your own needs and unaware of the consequences of your own actions.



    You are, at heart, a good person. You are very affectionate, and you are very loyal to your friends and family. You are very reluctant to burden others with your own problems, to the point that this in itself can become a problem for the people who care about you. This is a particular of a more general problem. Dionysus sends wave of ruin throughout his personal life. He is the photographer who seduces his subjects. He is the teacher who seduces a student. He is the art student who paints nonrepresentational splashes of color, he is the poet who rejects meter and content. You seek sexual partners more than anything else (this is to exploit the nurturing side of others to help fill your own void). If not sexual partners, this desire to become the object of sympathy with other people can manifest itself in other destructive ways. Stinkfist by Tool explains your condition pretty well. It's very likely that you haven't had many experienced mentors. You don't want them either, because you're the sort of person who rejects criticism and boundaries, but they're also your only hope for reaching any kind of emotional maturity.



    Famous People Like You: John Lennon, Mick Jagger, Michael Jackson, Britney Spears, Marilyn Monroe, Hugh Hefner

    I'd tell you to stay clear of Hermes, Icarus and Apollo, but you could probably learn something from them. You're least likely to hurt The Oracle, Atlas, Prometheus, and Daedalus, but Atlas and Daedalus won't like you very much.
    Seek out: The Oracle, Prometheus




    Link: The Greek Mythology Personality Test written by Aleph_Nine on OkCupid Free Online Dating, home of the The Dating Persona Test

    (link) [elijahwright]

    2007 permanent link

    boogs!
    on a bug-filing spree today.

    kind of fun, but also kind of twisted. ;)
    (link) [elijahwright]

    2007 permanent link

    Sun, 05 Aug 2007

    Bloomington OpenSolaris User Group (BTN-OSUG)
    Along with Phillip Steinbachs from The Center for Genomics and Bioinformatics, I am... 'encouraging' the formation of an OpenSolaris user group to serve the Bloomington and central Indiana area. [Indy probably needs a group all its own, eventually...]

    We put a proposal in last week to the umbrella OpenSolaris organization; accepted and pushed through the process with flying colors. It was unbelievably *easy*. Now the hard stuff will start to come up.

    A listserv and some content for our space on the opensolaris.org site are really the next things on the agenda. I think Phillip is taking charge of putting some content there, probably sometime this week.

    Why OpenSolaris? Well... there are some things about OpenSolaris that meet different ecosystem needs than the Debian bits that I otherwise prefer to use. :-)

    I am looking very much forward to Sun's Project Indiana, in hopes that the two sub-platforms (OpenSolaris and Debian) I use most for research computing will become a lot more similar than they currently are.
    (link) [elijahwright]

    2007 permanent link

    Wed, 27 Jun 2007

    twilightimperium3 player map


    (link) [elijahwright]

    2007 permanent link

    Thu, 22 Mar 2007

    twitter
    i have a twitter account now - feel free to friend me or add me at your leisure. i will, of course, reciprocate. you can find me there at http://twitter.com/elijahwright [what is twitter? twitter is a status-notification system for friends. or for anyone, really. it looks handy, so i'm trying it out.]

    2007 permanent link

    Wed, 21 Mar 2007

    planetplanet update
    I've updated planetplanet, the software that drives slisblogs.com, to a slightly less ancient version. We'll see whether this straightens out the "issues" with a few of the feeds, or not. [Note - bzr is *cool*. This software is one of the very few things that I touch that uses bzr, sadly....]

    2007 permanent link

    Tue, 20 Mar 2007

    Why Doesn't Google Calendar Format Entries Correctly... Or Does It?
    I just added the feed for the SLIS Doctoral Student Association to slisblogs. What a mess. First, I got every calendar item sucked onto the page at once. THere are a LOT of them. Second, the formatting kind of stinks. I'm guessing, at this point, that maybe an update to the planetplanet software would help - but I'm not even really sure. Getting rid of an extra "br" tag here and there may be tougher than that............

    2007 permanent link

    Tue, 25 Jul 2006

    flickr brokenness
    I had to disable the pulling of feeds from flickr to slisblogs.com. Something was, apparently, changing repeatedly at flickr - leading to some serious spammage of slisblogs with the same photos over and over. I don't like instability that much....
    (link) [elijahwright]

    2006 permanent link

    Fri, 21 Jul 2006

    recent movie watching
    Some reviews, based on my recent movie watching: 1) Superman Returns -- well, it stank. 2) V for Vendetta -- well, it was okay. I like the subversive elements. 3) Elizabethtown -- about E-town, which I drive through periodically on the way to visit the fam... okay, but a little less than lucid. Happy fuzzy movie, not really very clear at some points exactly what is going on.
    (link) [elijahwright]

    2006 permanent link

    Mon, 17 Jul 2006

    new fishies
    My fishtank suffered some casualties, so I had to boost the population.

    Now in the tank are six more green tiger barbs, three dwarf gouramis, and a lone blue gourami that was in one of the tanks at PetCo....

    Man, I dig fish.
    (link) [elijahwright]

    2006 permanent link

    Thu, 13 Jul 2006

    Crackers
    Last night, I made a trip to Crackers comedy club in Indy. Fun was had. The headliner is going to be on "bob and tom" Friday morning. I guess he was funny... sort of.
    (link) [elijahwright]

    2006 permanent link

    Tue, 11 Jul 2006

    arrrrgh.
    Tonight's fun: setting up an ipf firewall. On a machine running Solaris 9. Which isn't all that ancient, actually -- but which is no longer what we use for new machines.

    A little frustrating. I haven't touched ipf on sol9 in *ages* - like four years - and there are a few cobwebs accumulating on those brain cells.

    I'd much rather do a nice smooth upgrade to sol10, instead, but that would probably take much, much longer than what I just did.
    (link) [elijahwright]

    2006 permanent link

    test post
    This is a test post - I'm trying out the interface to post to livejournal via jabber... from gaim, on ze linux desktop. I am pretty sure it will work, but we'll see.
    (link) [elijahwright]

    2006 permanent link

    Mon, 19 Jun 2006

    the tone adults supposedly can't hear
    Some of you may have heard about this new ringtone - the one that adults supposedly can't hear, but that teens can.

    It turns out that I *can* hear it, and it is annoying as heck. Very, very painful whining noise with a good large dose of rough distortion in it. Painful on the ears.
    (link) [elijahwright]

    2006 permanent link

    Mon, 12 Jun 2006

    Special Issue on FL/OSS
    [Error: Irreparable invalid markup ('<yuwei{at}ylin.org>') in entry. Owner must fix manually. Raw contents below.]

    ======================================== Call for Papers for a special issue 'Socio-technical Dynamics in the Free/Libre Open Source Software (FLOSS) Social World' in the journal Science Studies, an Interdisciplinary Journal for Science and Technology Studies (http://www.sciencestudies.fi/), to be published autumn 2007 Guest Editors: Yuwei Lin (University of Manchester) & Lars Risan (University of Oslo) ======================================== The development of Free/Libre Open Source Software not only intrigues computer scientists to review processes and methods in software engineering, but also stimulates social scientists to look into what have become a mythical phenomenon of our digital era. Questions around how distributed groups of individuals work together in an on-line environment, seemingly without formal ties, to produce high-quality software that acquire cross-sector acceptance continue to puzzle social scientists. Over the past years, anthropologists, economist, historians, lawyers, philosophers, and sociologists have tried to provide various explanations to the phenomenon of on-line social networking, on-line collaboration and on-line knowledge creation and sharing (i.e. common-based peer production). However, the existing body of literature on FLOSS faces a bottleneck, namely that of lacking a STS-inspired empirical investigation of the multiplicity of FLOSS-practices. Here, we try to raise some provocative questions: What kind of questions do FLOSS-practices and networks pose to STS? And does STS really possess theoretical tools that are good enough to analyse the FLOSS development? Might it be that the materiality - and the immateriality - of code needs theoretical and methodological contributions from other fields in social sciences such as politics and economics (such as network effects, lock in and abstract objects)? But then, that challenge is also bidirectional: How does the theoretical vocabularies and the empirical methods of STS add something new to the more economical understandings of FLOSS? This special issue aims to meet these theoretical and methodological challenges in both FLOSS and STS studies. It does so by encouraging research based on qualitative research methodologies and methods. Such a qualitative inquiry challenges the universally vocal and normative way of depicting FLOSS culture and practices (e.g. a homogeneous gift-giving and volunteering culture). The special issue will take a practice-based view to exploring multiple cultures and practices in developing, localizing, appropriating, commodifying, customizing FLOSS. The issue would also like to address the diversity in FLOSS communities through asking how seemingly global FLOSS culture is translated (un)successfully into different contexts and locales. We believe that this issue will demystify several stereotypes and misunderstandings about FLOSS and shed light on many emerging and changing cultural and socio-technical practices in our digital society and knowledge driven economies. Thinking reciprocally, we would also like to allow peculiar im/materialities of FLOSS practices challenge the way STS has traditionally dealt with socio-technical networks. ----------------------- Instructions to authors ----------------------- Manuscripts in English in any area relevant to the special issue should be submitted electronically to the guest editor Yuwei Lin <yuwei{at}ylin.org> and Lars Risan <lars.risan{at}tik.uio.no>. You will normally receive an acknowledgement within a few days. Please provide email addresses for all authors. Papers, no exceeding 10,000 words including notes, references and abstract, are accepted in electronic format, with Open Document Text (.odt) or OpenOffice.org 1.0 Text Document (.sxw) being the preferred formats (other formats are acceptable by prior arrangement). Files should not be security protected, and should be anonymised. The editors reserve the right to make the style of presentation uniform prior to publication, whilst making every effort not to alter the content of an article. Paper submission will be acknowledged via email. Subsequent enquiries concerning paper progress should be made to the guest editor Yuwei Lin <yuwei{at}ylin.org> and Lars Risan <lars.risan{at}tik.uio.no>. For details of preparation of the manuscript, see the Science Studies Journal website http://www.sciencestudies.fi/?q=authors/#preparationofmanuscripts and http://www.sciencestudies.fi/authors. --------------- Important dates --------------- October 29, 2006: full paper submissions to guest editors. January 15, 2007: Guest editors and authors complete manuscripts and round robin referee each other's articles. February 7, 2007: Guest editors submit a complete set of articles to Science Studies for review. Science Studies may return articles for revision if needed before sending to outside referees. April 25: Deadline for referee reports to be sent back to Science Studies. Reports and decisions sent to authors and guest editors. August 22: Final Copy Due September - October 2007: Layout and proof-reading. November 2007: Issue goes to press.

    (link) [elijahwright]

    2006 permanent link

    Wed, 24 May 2006

    T2000 / Solaris 10
    Today's fun: jumpstarting Solaris 10 onto a Sun T2000. Nice box. Small, powerful, and incredibly noisy. I think we might have a dead fan bearing. I don't want to call support just yet... it isn't fun. Sun has horrible elevator music.
    (link) [elijahwright]

    2006 permanent link

    Fri, 14 Apr 2006

    tooling around with databases
    tooling around with databases today. moving big blobs of social network data into postgresql. painful, not fun, and frustrating. good, though. ;)

    /snark
    (link) [elijahwright]

    2006 permanent link

    Mon, 12 Dec 2005

    Which OS are you?
    You are OS X. You tend to be fashionable and clever despite being a bit transparent.  Now that you've reached some stability you're expecting greater popularity.
    Which OS are You?

    (link) [elijahwright]

    2005 permanent link

    Mon, 21 Nov 2005

    The top 20 geek novels, ones I've read in bol
    The top 20 geek novels, ones I've read in bold.

    1. The HitchHiker's Guide to the Galaxy -- Douglas Adams
    2. 1984 -- George Orwell
    3. Brave New World -- Aldous Huxley
    4. Do Androids Dream of Electric Sheep? -- Philip Dick
    5. Neuromancer -- William Gibson
    6. Dune -- Frank Herbert
    7. I, Robot -- Isaac Asimov
    8. Foundation -- Isaac Asimov
    9. The Colour of Magic -- Terry Pratchett
    10. Microserfs -- Douglas Coupland
    11. Snow Crash -- Neal Stephenson
    12. Watchmen -- Alan Moore & Dave Gibbons
    13. Cryptonomicon -- Neal Stephenson
    14. Consider Phlebas -- Iain M Banks
    15. Stranger in a Strange Land -- Robert Heinlein
    16. The Man in the High Castle -- Philip K Dick
    17. American Gods -- Neil Gaiman
    18. The Diamond Age -- Neal Stephenson
    19. The Illuminatus! Trilogy -- Robert Shea & Robert Anton Wilson
    20. Trouble with Lichen - John Wyndham
    (link) [elijahwright]

    2005 permanent link

    Mon, 14 Nov 2005

    People love SLIS podcasts!
    See here:

    http://www2.scedu.unibo.it/roversi/Blog/2005/10/universit-e-podcasting.html

    :)
    (link) [elijahwright]

    2005 permanent link

    Mon, 07 Nov 2005

    elke michelmayr: a case study on emergent semantics in communities

    folksonomies - what are they?
    comparison to taxonomies
    
    
    multi-user web applications that provide a simple categorization sy stem
    - items: web pages, images, citations
    tags = keywords ... can be chosen freely
    every user has a web page with a list of own items
    - sorted in reverse-chron order
    - can be filtered by tags
    public access to item collections and metadata
    
    bottom-up approach to categorization
    - no pre-defined model or hierarchy
    - inconsistencies
    -- synonyms, homonyms
    -- singular and plural versions of a tag
    -- keywords that conssit of two terms (ie semantic web, semantic_web,
    semanticweb)
    -- relies on aggregation of metadata
    -- tag frequency distribution: tags most often used to annotate an item
    categorize it best; no need to reach consensus
    -- relationships between tags evolve from metadata
    
    - amount of metadata crucial!
    -- number of users, lifetime of folksonomy
    
    comparison of metadata
    - lots of discussion about taxonomies vs. folksonomies, eg clay shirky 2005
    - experiment: compare metadata from two big community projects that 
      categorize web pages to find out about the differences
    - dmoz open directory project http://dmoz.org
    -- taxonomy for web pages
    -- ~ 600k concepts and about 5M instances
    -- available in RDF format (two big files)
    - social bookmarking site del.icio.us
    -- no official numbers; ~100k users
    -- download the web pages (simple html)
    
    
    procedure
    -- use only items from del.icio.us that were annotated by more than 
       100 users (=popular items)
    -- download random popular items from del.icio.us
    -- lookup if items are present in the dmoz collection (~25% of the items 
       were also present in dmoz)
    -- 788 items with metadata from both sources (~50% of them are instances of 
       dmoz concept Top/Computers)
    
    preparation of data
    - preparations (much mangling of data here...)
    - example:  Top/Science/Math/Publication -> publication math science
    - how to compare?
    -- avg dmoz hierarchy length: 4.67
    -- avg del.icio.us tags per item: 24.59
    
    comparison
    -- lookup for each dmoz category (is it included in the del.icio.us tags?)
    -- take top 1,3,5,10,15,all tags into account
    --- top tag is included in ~50% of all cases
    --- top 5 is the fairest comparison
    --- top tags match more often than the less popular ones
    
    
    folksonomies and peer to peer networks
    - architectures are very diffferent
    -- folksonomies are centralized systems, aggregation is easy
    -- p2p networks are distributed, aggregation is hard.
    - user behavior is comparable
    -- act autonomously
    -- no central authority
    -- want to share information
    - data from a folksonomy can be used to model peers and content distribution
    - ...
    
    
    can interest-based locality be observed?
    - interest based locality (defn)
    - method
    -- retrieve all users from del.icio.us that store a random bookmark
    -- retrieve all their collections
    - retrieved 4 test sets
    -- 155, 248, 280, 551 users
    -- distribution of items among users nearly equal in the test sets
    -- avg.: 84% of items are not shared.
    
    related work
    
    adam mathes, 2004: folksonomies - cooperative classification and
    communication through shared metadata
    
    clay shirky, 2005: ontology is overrated: categories, links, and tags
    
    scott golder and bernardo huberman, 2005...
    
    
    summary
    - investigated the properties of metadata provided by a folksonomy
    - compared it to dmoz data collection
    - tried to find interest based locality
    - paper contains some other experiments i did not have time to tell you
    about
    - open questions
    -- is there a way to combine the bottom-up and top-down approach for
    creating metadata
    -- how much could the semantic web benefit from it?
    
    
    audience questions:
    
    have you thought about comparing the tags used at delicious to the meta tags
    provided by page authors?  e.g. to detect spamming by page authors of search
    engines
    
    - mention of delicious director
    

    2005 permanent link

    Phillipe Cudre-Mauroux: analyzing semantic interoperability in bioinformatic database networks

    1) peer data management systems
    2) semantic interoperability in the large
    3) the sequence retrieval system
    - degree distribution
    - analysis of giant component
    - weighted analysis
    4) conclusions
    
    
    beyond keyword search - searching semantically richer objects in large
    scale herterogenous networks  (semi-structured or structured data)
    
    decentralized data integration
    large scale information systems (e.g. WWW) VS distributed databases
    
    data integration: LAV/GAV
    - traditional database techniques (LAV/GAV) rely on centralized schemas to
    integrate data sources.
    - not applicable to our context
    -- scale (upper ontologies?)
    -- churn
    -- autonomy
    - how can we foster semantic interoperability in decentralized settings?
    
    semantic interoperability
    - from 'own schema' to 'known schema'
    - extending semantic interoperability to ....
    
    peer data management systems
    - pairwise mappings
    -- peer datamanagement systems (PDMS)
    - local mappings overcome global heterogeneity
    -- interactive query rewriting
    
    
    semantic mediation layer
    - semantic mediation layer
    over:
    - overlay layer
    over:
    - physical layer
    
    correlated/uncorrelated among the three layers.
    
    
    schema-to-schema graph
    - inter-organization of the different schemas used by the peers
    -- logical model
    -- directed
    -- weighted
    -- redundant
    
    
    the semantic connectivity graph
    - definition (semantic interoperability
    -
    - 
    -
    
    observations
    - theorem
    - observation 1
    - observation 2
    
    semantic interop in the large
    - how can we analyze semantic interop in large-scale pdms?
    -
    
    size of the giant component
    
    
    the sequence retrieval system
    
    why is srs interesting?
    - applying our heuristics on a real large-scale corpus of interconnected
    databases
    -- more than 380 databanks
    -- more than 500 (undirected) links
    -- data used by professionals on a daily basis
    
    crawling the srs schema-to-schema graph
    - custom crawler
    - as of may 2005 (ebi repository)
    -- 388 nodes
    -- 518 edges
    
    - giant connected component (187 nodes)
    - power law distribution of node degrees
    - clustering coefficient = 0.32
    - diameter = 9
    
    results
    - connectivity indicator ci = 25.4
    -- super critical state
    - size of the giant component
    -- 0.47 (derived)
    -- 0.48 (observed)
    
    graphs with same power-law degree distribution
    - varying number of edges
    
    analyzing weighted networks
    - do we have a sufficient number of 'good' mappings
    - introducing quality measures from the mappings
    -- weights
    -- attribute /schema level
    -- cf. Chatty Web (WWW03)
    
    - semantic query forwarding 
    -- per hop forwarding behaviors
    -- only forward if w sub i >= tau
    --- tau = 0 : flooding
    --- tau = 1 : exact answers
    
    
    weighted results
    - same degree distribution (388 nodes)
    - uniformly distributed weights between 0 and 1
    
    conclusions
    - analysing a real network of bioinformatic databases
    -- accurate results (even for relatively small networks)
    -- weighted / unweighted
    - current works
    -- compositions of weights along a path
    -- semantic random walkers
    -- public domain simulator
    - future works
    -- analysing other forwarding behaviors
    -- implementation in a real pdms (self-organizing mappings)
    --- gridvine
    
    
    references
    a necessary condition for semantic interoperability in the large
    cudre-maroux and karl aberer (ODBASE 2004)
    
    gridvine: building internet-scale semantic overlay networks
    ISWC2004
    
    semantic overlay networks (tutorial)  VLDB 2005
    
    
    complete reference list available at http://lsirpeope.epfl.ch/pcudre
    
    

    2005 permanent link

    heiner stuckenschmidt: social network analysis as a basis for partitioning
    ontologies

    motivations - the case for ontology partitioning
    
    a partitioning method
    - create a dependency graph
    - strength of dependencies
    
    ontologies are the backbone of semantic web applications
    more and more large ontologies become available
    maintenance and handling is becoming a problem
    
    the case for partitioning:
    
    distributed development and maintenance
    selective publication and use of terminologies
    manual inspection and validation
    editing, visualization, and reasoning
    
    
    an abstract view of the problem:
    
    despite the standardization of languages there is no agreement on the
    way ontologies are represented.
    
    - all ontologies contain classes
    - most organize them in a hierarchy
    - many define relations between classes
    - some provide formal definitions of classes
    
    we concentrate on partitioning ontologies into disjoint sets of
    concepts.  class hierarchy, relations, and definitions provide input
    for the partitioning algorithm.
    
    
    overview of the process:
    
    1) create dependency graph
    
    dependencies I: subclass relations
    dependencies II: shared relations
    
    2) determine strength of dependencies
    
    relative strength networks
    - compute relative strength [Burt, '92] of dependencies
    
    3) compute partitions
    
    computing islands 
    
    - we use maximal line islands [Batagejl 2000] to compute partitions in
      the dependency graph [a set of vertices is a line island in network if
      and only if it induces a connected subgraph and the lines inside the
      island are stronger related among them than with the neighboring
      vertices. in particular there is a maximal spanning tree T over nodes
      in the island such that....
    
    - the minimal weight in the spanning tree is called the 'height' of an
    island.
    
    - understanding islands
    - result for the example
    
    4) improve partitioning
    
    improving partitions
    
    - islands are often very small (2-4 nodes) resulting in unwanted
    partitions of the ontology
    - observation: small islands almost always have a large height value
    (1 or 0.5)
    - approach: merge partitions with a height of 1 or 0.5 with
    neighboring partitions, based on strength of connection: ...
    
    ontology partitioning tool
    - features:
    -- owl and kif import
    -- selection of criteria 
    -- computation of line islands
    -- graph export
    -- precision and recall measurement
    
    an experiment
    - data: acm topic hierarchy
    - partitioning method:
    -- relations: hierarchy
    -- maximal size: 100
    -- merging threshold: 0.2
    
    - evaluation:
    -- topics on dutch cs department home pages
    -- compared with root nodes of determined modules
    
    - results
    -- terms do correspond to major areas in CS
    -- quite some overlap with the extracted terms
    -- further experiments needed
    
    

    2005 permanent link

    Sun, 23 Oct 2005

    Wallace and Gromit: the Curse of the Were-Rabbit
    A small gang of us went to see the new Wallace & Gromit movie last night. Claymation goodness everywhere.

    We also made pit-stops at Anatolia (mmm, turkish food) before, and @ the Irish Lion afterwards... photos have been dutifully flickr-ized by those of us in attendance. ;)
    (link) [elijahwright]

    2005 permanent link

    Thu, 20 Oct 2005

    Sea Lions vs. Stateys

    (link) [elijahwright]

    2005 permanent link

    Wow.



    Wow.
    (link) [elijahwright]

    2005 permanent link

    Fri, 14 Oct 2005

    the "google *name* needs" meme
    here're my results:

    Elijah needs to quit playing Messiah
    Elijah needs a spanking, and quite frankly so do his parents.
    Elijah needs a family
    Elijah needs his leg rehabbed and his nurse is Robin Wright-Penn
    Elijah needs to cross a river
    Elijah needs limits set
    Elijah needs stuff like this every now and then to keep his mind off things
    Elijah needs to be changed
    Elijah needs warming
    Elijah needs to leave around noon.
    Elijah needs to understand
    Elijah needs true, solid things, things that bear a significance, things that
    have an history.
    Elijah needs some sexual love...
    Elijah needs to grow the f*ck up...
    Elijah needs to stop and think about this big time!
    Elijah needs a puppy, that's all I know about that.
    (link) [elijahwright]

    2005 permanent link