george tziralis thought log RSS

more about me on my personal homepage

drop me a line at gtziralisATgmail.com

log archive


follow gtzi at http://twitter.com

Oct
23rd
Thu
permalink

Teaching Prediction Markets

I gave an introductory lecture on prediction markets earlier today, in the context of a undergraduate course in Logistics at NTUA’s School of Mechanical Engineering. The feedback and responses on running some hands-on experiments (you can guess the software) were really great, I expect that this will be repeated in a few days when I’m giving a lecture again, in the course of Production Management & Control this time.

I also came up with some extended lecture notes, which you may find of value in the all-but-rare case of being interested in the topic and understanding greek (63 pgs, .pdf, published under CC attribution -share alike 3.0).

Comments (View)
Oct
16th
Thu
permalink
He who writes a lot, has little to say.
— from a discussion with Professor George Cosmetatos, member of my PhD thesis committee, on the extent of my dissertation
Comments (View)
Oct
6th
Mon
permalink

Conjuring Startups out of Thin Air, a presentation at Stream08

A couple of days ago, George Kasselakis, Dimitris Athanasiadis and I had the privilege to lead a discussion at the Stream08 unconferene. Together with Jennifer Schenker of BusinessWeek, we attempted -quite successfully!- to trigger the conversation about innovation in Europe, trying to figure out some best practices for enabling entrepreneurship excellence.

The presentation is embedded below and we were lucky enough to get feedback from some very experienced european VCs and Tim O’Reilly, among others. Insights on which should be the steps to follow the apparent (but yet almost outward) success of Open Coffee in Greece were plenty (also Jeff Pulver contributed some very useful insights later on in the bar), however I do believe that your insights are equally valuable, so please contribute to the discussion here or in the original Open Coffee post.

SlideShare | View | Upload your own

P.S.: On a side note, Jason Calacanis will attend and speak at Open Coffee Athens XV tomorrow, you just can’t miss that!

update: Jennifer Schenker’s piece on Stream08 and our session, available right in Business Week.

Comments (View)
permalink
an interview of mine appeared yesterday in V-Men magazine, distributed with the sunday edition of daily newspaper To Vima and claiming a circulation of .475M (full text is here, in greek).

an interview of mine appeared yesterday in V-Men magazine, distributed with the sunday edition of daily newspaper To Vima and claiming a circulation of .475M (full text is here, in greek).

Comments (View)
Sep
17th
Wed
permalink
The show has moved to the tech start-up scene.
— Attending SIME Helsinki, the semantics of location just made this clear to me…
Comments (View)
Sep
16th
Tue
permalink

Market-driven Innovation Management, from the inside in

I attach the presentation file, full paper and abstract of the work I presented earlier today at APMS 2008, here in beautiful Espoo, Finland. Your comments are welcome.

Market Drive Innovation Management, from the inside in View SlideShare presentation or Upload your own. (tags: tziralis predictionmarkets)

abstract: Modern enterprises and organizations seem like market-agnostic, semi-permeable bubbles, in a market-powered universe. Although markets external ly define companies’ operations, such mechanisms have yet no place in supporting the decisions of those entities. We attempt to address this reality by exploring the use and impact of an internal market mechanism to support decision-making in innovation management. We step up by focusing on a generic innovation’s management problem, the one of idea selection. An abstract model of an internal market is shaped, with contracts traded on selecting the idea that has the greatest potential for deployment. The questions that we ultimately address regard the properties of market’s convergence towards equilibrium. In our case, this translates to a meta-mechanism able to aggregate the totality of available information throughout knowledge workers and utilize it to highlight among the available ideas the one with the greatest potential for development. A market-approach to innovation management is rather novel; we believe that this text provides some unique contributions in this developing field, while introduces various options for further research.

full paper (.pdf)

Comments (View)
Sep
8th
Mon
permalink

Introducing WebSource.it, a new pet project

Have you ever realized how many times you use Google search every single day? No? Get prepared to be amazed if you navigate to Google web history and click on ‘trends’. In my account, for example, Google has already tracked 23,025 searches, an average of about 45 queries per day. Sounds like a lot, right? And you may say it actually is, for a rudimentary service that has almost remained unchanged since its introduction 10 years ago and ‘just provides relevant results to search queries’. Well, let me argue that it’s not; at least for users being slightly smarter than dumb. Let me elaborate the reason.

Google, except from being relevant, is also fast. And speed is a matter of utter importance, if not the most significant one. Yes, it’s faster to search the web than your hard disk, enter arithmetic calculations or find word definitions into your browsers’ search box rather than opening a calculator or a dictionary, search for ‘wikipedia silvereye’ and feel lucky, instead of navigating to wikipedia’s homepage and finding your way from there; it keeps going. It should be by now apparent, Google turns out to be a launcher -over time and the more you use it-, next to its default search functionality, the recent Chrome browser being the most ubiquitous proof.

Turning back to my personal experiences -I bet they sound familiar- what I realize is that more and more often I enter longer queries and I don’t even click on any of the search results; Google web history comes again into support and reveals that this is the case for roughly half of my very recent queries. So, why is that, has Google become less relevant? No, not at all. It appears that I’m just looking for something else, which turns out to be different than any of the specific results. And that is their total number. The total number of results returned by a query in Google might look worthless, and it actually is when considered in an absolute sense. But, move that to a relative setting -aka comparing the results of two or more search queries- and yet you have a fantastic tool for a wide variety of purposes, powerful while elegant on its simplicity. Feeling unsafe about two potential spellings of a word? Run a query for both of them and select the one with the most results. Wanna pick a product and you don’t know which of the reviews to trust? Search for “productname good” and “productname bad” and find out how many people have written about the first versus the second, that will probably turn out to be a more sincere advice, at least worth of the time you spent for the ‘survey’.

Well, to be honest and while speaking of time spent, the concept is fantastic, but its implementation is not-so-fast. Needing to iterate the search process a couple of times or more and then remembering the specific number of results that Google returned each time is a process that could profoundly be improved. And the conception was common and clear in a recent Open Coffee Athens meeting, when my co-founder Efthimios Mpothos, our good friend Dimitris Athanasiadis and I were talking about how each one of us utilizes Google in daily practice: Why don’t we optimize the process by ourselves?

So, today we are happy enough to introduce you a tiny tool, result of limited effort and time, but potentially able to make you reconsider the value a couple of google queries can offer you. And while we cannot claim of reinventing the wheel (clearly, there are many wheels out there), we do think that our app is slick and simple, next to cute and time and attention efficient. It’s name? Well, each group of searches serves as an attempt to outsource a task, ranging from a quick spell checker task, to an elementary poll, to a basic sentiment analysis tool, or to whatever else you can imagine it being serving of. And, particularly, this is an attempt to outsource this task to Google, essentially to outsource it to the web-at-large. So, let it be named WebSource.it, and that’s the name of it.

Yes, by now you may navigate to http://websource.it, enter up to 5 terms separated by a Tab stroke and hit enter: What you’ll get is just the number of relevant Google search results, as provided by the Google API. And you may rest on the shoulders of the crowds to select the term with the most results, highlighted with green. Or, as an another uber-fast option for you “big-guys-who-don’t-click”, you may enter websource.it/search/term1/term2 to get your results directly, without leaving the address bar.

We hope it will be useful for you, at least as it was proved to be for us so far and we do await for your own very innovative uses.

Comments (View)
permalink
We just added another option -facebook connect that is- to let practically anyone get into and take a look at our pride and joy, askmarkets. So, by now you can navigate to askmarkets.com, press the facebook button, enter your facebook credentials and -boom- you’re in, go trade, spread the word and let us know what you think askmarkets.

We just added another option -facebook connect that is- to let practically anyone get into and take a look at our pride and joy, askmarkets. So, by now you can navigate to askmarkets.com, press the facebook button, enter your facebook credentials and -boom- you’re in, go trade, spread the word and let us know what you think askmarkets.

Comments (View)
Aug
5th
Tue
permalink

Quoted in Chicago Tribune - the story beyond

I was honored enough to be quoted among the former ATHOC President Gianna Angelopoulos-Daskalaki and the former Mayor of Athens and current Minister of Foreign Affairs Dora Bakoyannis, in a today’s article of the much respected Chicago Tribune, regarding the post-Games Athens (update: the article actually appeared at the newspaper’s front page).

To give you some more info on that, I have met the journalist Philip Hersh in Guatemala, at an IOC conference a year ago. Interestingly, we both attended the Sport Accord 2008 exhibition, held early June in Athens and I was at Chicago a month ago; however the interview was conducted via phone and I was asked to share my humble opinion about the status of the Olympic legacy of Athens, as a senior researcher of the Athens OGGI team.

After all, Mr. Hersh quotes me saying “I do think there are some opportunities that haven’t been used, and I don’t know if and when they will be” and [regarding the main Athens Olympic Sports complex] “I would like to see it as an Olympic Park, where people would use it, we in Athens don’t have a large park or one like [Chicago’s] Millennium Park” (well, clearly I pretty much liked the audio picnic option there, but this is another topic).

While I do not put into question the validity of quotes attributed to me, I feel that there was maybe a slightly biased and somehow disjointed citation of them, especially in the given context of the article’s corpus. I mean, in the phrase “Well, ‘A’ is true, but consider also ‘B’ and ‘C’, which clearly change the broader picture ‘D’.”, you may quote someone saying ‘A’, but this is only the partial truth, and not the full story.

I’m not willing to open the huge debate on 2004 Olympics and their legacy right here and now, nor I consider myself as the most appropriate one to handle or take part in it. However, if you want to get a much broader picture, you may go read this paper and this text (more and specific data are on their way to release) and shape your very own opinion. As for me, I clearly learned my lesson, concerning dealing with (old) media: If you don’t want to be quoted of saying ‘A’, then just don’t say it, in any context and collocation of your words. :)

Comments (View)
Aug
1st
Fri
permalink
Everything under the sun is on ‘public domain’. Thus, it might end up on the web, too. Get used to it, or stay at home.

a re-tweet, inspired by boris and mike.

please accept/correct/upgrade, or discard (I’m not the law guy)

Comments (View)