Wolfgang Gatterbauer

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Computer Science

• Towards Domain-Independent Information Extraction from Web Tables,
  Wolfgang Gatterbauer, Paul Bohunsky, Marcus Herzog, Bernhard Krüpl, Bernhard Pollak,
  In Proceedings of the 16th International World Wide Web Conference (WWW 2007), pp. 71-80, Banff, Canada, May 2007. ACM Press.
  [ Paper, bib]

  Online VENTex: Some more info and a preliminary ("beta") online test version of VENTex.

• Creating Permanent Test Collections of Web Pages for Information Extraction Research,
  Bernhard Pollak, Wolfgang Gatterbauer.
  In Proceedings of the 33rd International Conference on Current Trends in Theory and Practice of Computer Science (SOFSEM 2007), Volume II, pp. 103-115, Prague, Czech Republic, January 2007. Institute of Computer Science, Academy of Sciences of the Czech Republic.
  [ Paper, Presentation, Poster, bib]

  WebPageDump: WebPageDump is a Firefox extension which allows you to save local copies of pages from the Web. It sounds simple, but it's not. The standard "Save page as" function of web browsers fails with most dynamic web pages and this shortcoming was a serious problem for our research. Comes the birth of WebPageDump. We hope you find it useful too.

• Table Extraction Using Spatial Reasoning on the CSS2 Visual Box Model,
  Wolfgang Gatterbauer, Paul Bohunsky.
  In Proceedings of the 21st National Conference on Artificial Intelligence (AAAI 2006), pp. 1313-1318, Boston, Massachusetts, July 2006. AAAI, MIT Press.
  [ Paper, Presentation, bib]

  Online VENTrec: An online test version of VENTrec, our first version of a robust web table recognition system, together with details on the experiments. Please try it and leave us some feedback after playing with the system. Soon comes our next generation system: VENTex.

• Estimating Required Recall for Successful Knowledge Acquisition from the Web,
  Wolfgang Gatterbauer.
  In Proceedings of the 15th International World Wide Web Conference (WWW 2006), pp. 969-970, Edinburgh, Scotland, May 2006. ACM Press.
  [ Paper, Poster, Poster1+2, bib]
• Web Information Extraction Using Eupeptic Data in Web Tables,
  Wolfgang Gatterbauer, Bernhard Krüpl, Wolfgang Holzinger, Marcus Herzog.
  In Proceedings of the 1st International Workshop on Representation and Analysis of Web Space (RAWS 2005), pp. 41-48, Prague, Czech Republic, September 2005. VSB - Technical University of Ostrava.
  [ Paper, bib]
• Using Visual Cues for Extraction of Tabular Data from Arbitrary HTML Documents,
  Bernhard Krüpl, Marcus Herzog, Wolfgang Gatterbauer.
  In Proceedings of the 14th International World Wide Web Conference (WWW 2005), Special Interest Tracks and Posters, pp. 1000-1001, Chiba, Japan, May 2005. ACM Press.
  [ Paper, bib]
• WAT: A Distributed File Sharing System - Global knowledge of widespread storage,
  Wolfgang Gatterbauer, Aaron B Strauss, Toh Ne Win.
  Design project 2, Computer Systems Engineering (6.033) - Spring 2001, MIT, May 2001.
  [ Paper]
• The CyberBeanie Toy Routing System: A Resource-saving Network-Layer,
  Wolfgang Gatterbauer.
  Design-Project 1, 6.033: Computer Systems Engineering - Spring 2001, MIT, March 2001.
  [ Paper]

Electrical Engineering and Technology & Policy

• Counterexamples to Commonly Held Assumptions on Unit Commitment and Market Power Assessment,
  Wolfgang Gatterbauer, Marija Ilic.
  In Proceedings of the 34th Annual North American Power Symposium (NAPS 2002), pp. 219-225, Tempe, Arizona, October 2002. IEEE.
  [ Paper, Presentation, bib]
• Interdependencies of Electricity Market Characteristics and Bidding Strategies of Power Producers,
  Wolfgang Gatterbauer.
  Master's thesis, Massachusetts Institute of Technology, Cambridge, MA, USA, May 2002.
  [ Thesis, bib]

  Within the context of the ongoing deregulation of the electricity industry, we disprove in the first part the commonly stated assumption that, in theory and under the condition of perfect information, decentralized and centralized unit commitment would lead to the same power quantities traded and, hence, to the same optimal social welfare. We show that, even in the absence of any uncertainties, independent optimization of the individual performance objectives by the decentralized market participants can actually lead to lower efficiency than centralized minimization of total operating cost. This result concerns short-term supply optimization for a given demand, and does not consider long-term investment issues.

  In the second part, we take the position of an individual market participant in a deregulated electricity market. We investigate the task of optimally self-scheduling generators to maximize profits by using stochastic dynamic programming. With the help of actual price forecast data from the ISO New England electricity wholesale market, we demonstrate the improvements that result from modeling the forecast price errors assuming a Cauchy error distribution instead of the commonly used Normal distribution.

  Finally, by taking statistic uncertainties and inter-temporal interdependencies into account, we show in the third part that a generator owner's optimum bid sequence for a centralized auction market is generally above marginal cost. In contrast to current literature, this is true even where absolutely no abuse of market power is involved. We conclude that marginal production costs cannot be used by themselves as baseline for the assessment of market power in electricity markets.

Mechanical Engineering

• Combining the Graz Cycle with coal and heavy oil gasification for industrial power stations
  (Original title in German: Der Graz Cycle für Industriekraftwerke gefeuert mit Brenngasen aus Kohle- und Schwerölvergasung),
  Herbert Jericha, Armin Lukasser, Wolfgang Gatterbauer.
  In VDI-Berichte Nr. 1566, Gas Turbines for Combined Cycles, pp. 177-185, Essen, Germany, September 2000.
  [ Paper, bib]
• The Graz Cycle as alternative approach to generate electricity from coal
  (Original title in German: Der Graz Cycle als technischer Zugang zur klimaneutralen Kohleverstromung),
  Wolfgang Gatterbauer.
  Strukturwandel als Gestaltungsaufgabe - Neue Rahmenbedingungen Konzepte und Instrumente für eine integrierte Energie- und Industriepolitik - Offenes Fachsymposium der Evangelischen Akademie Loccum, Loccum, Germany, June 2000.
  (Talk at this Energy policy symposium, no paper)

  The Graz Cycle is a thermodynamical combustion cycle that allows to retain and capture CO2 emissions stemming from combustion processes. For information in English and more recent publications, please check the Graz Cycle Web page maintained by Prof. Wolfgang Sanz.

Proseminar Web Information Extraction

Supervising practical work