Hjemmeside for Håkon Tjelmeland
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Håkon Tjelmelands hjemmeside


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Research

Software

  • XDE: a Bayesian hierarchical model for cross-study analysis of differential gene expression. It is using MCMC for a multi-level model for cross-study detection of differential gene expression.
  • XPN:A cross-platform normalization method for combining gene expression data from different studies.
  • Software for Bayesian prediction tree modelling, using MCMC for exploring spaces of Bayesian classification and regression tree models.

Publications

  • Recent technical reports:
  • Papers submitted for publication:
    • Toftaker, H. and Tjelmeland, H. (2012). "Construction of binary multi-grid Markov random field prior models from training images", Technical report, Statistics No. 1/2012, Department of Mathematical Sciences, Norwegian University of Science and Technology.

  • Publications in statistical journals:

  • Publications in applied journals:
    • Hammer, H., Kolbjørnsen, O. Tjelmeland, H. and Buland, A. (2012). "Lithology and fluid prediction from prestack seismic data using a Bayesian model with Markov process prior". Geophysical Prospecting, 60, 500-515, doi: 10.1111/j.1365-2478.2011.01012.x.
    • Pfuhl, G., Tjelmeland, H. and Biegler, R. (2011). "Precision and reliability in animal navigation", Bulletin of Mathematical Biology, 73, 951-977.
    • Pfuhl, G., Tjelmeland, H., Molden, S. and Biegler, R. (2009). "Optimal cache search depends on precision of spatial memory and pilfering, but what if that knowledge is not perfect?", Animal Behaviour, 78, 819-828.
    • Shabalin, A., Tjelmeland, H., Fan, C., Perou, C. and Nobel, A.B. (2008). "Merging Two Gene Expression Studies via Cross Platform Normalization", Bioinformatics, 24, 1154-1160.
    • Rabben, T.E., Tjelmeland, H. and Ursin, B. (2008). "Non-linear Bayesian joint inversion of seismic reflection coefficients", Geophysical Journal International, 173, 265-280.
    • Eftedal, O.S., Tjelmeland, H. and Brubakk, A.O. (2007). "Validation of decompression procedures based on detection of venous gas bubbles; A Bayesian approach", Aviation, Space, and Environmental Medicine, 78, 94-99.
    • Lia, O., Omre, H., Tjelmeland, H., Holden, L. and Egeland, T. (1997). "Uncertainties in reservoir production forecasts", American Association of Petroleum Geologists bulletin, 81, 775-802.

  • Selected papers presented at conferences and workshops:
    • Tjelmeland, H. and Eidsvik, L (2004). "Directional Metropolis-Hastings updates for posteriors with nonlinear likelihoods", Statistics No 5/2004, Department of Mathematical Sciences, Norwegian University of Science and Technology, presented at "Seventh International Geostatistics Congress", Banff, Alberta, Canada. pdf.
    • Tjelmeland, H. (2001). "Fitting Gaussian Markov random fields to Gaussian fields". Invited presentation at the 53rd Session of International Statistical Institute (ISI), Seoul. (extended abstract, pdf)
    • Tjelmeland, H. (2000). "An MCMC algorithm for sampling from the posterior conditioned to production history", Statistics No 2/2000, Department of Mathematical Sciences, Norwegian University of Science and Technology, presented at Geostats 2000 - South Africa, (abstract) (paper)
    • Tjelmeland, H. (1997). "A note on the Bayesian approach to history matching of reservoir characteristics", in Pawlowsky-Glahn, V. (ed.) IAMG'97, Proceedings of the Third Annual Conference of the International Association for Mathematical Geology, Barcelona, Spain, September 22-27, 1997, CIMNE, Barcelona, 1997. (abstract)
    • Tjelmeland, H. (1997). "Modeling of the spatial facies distribution by Markov random fields", in Baafi, E.Y. and Schofield, N.A. (eds.) Geostatistics Wollongong '96, Proceedings of the Fifth International Geostatistical Congress, Wollongong, Australia, September 22-27, 1996, Kluwer Academic Publishers. (abstract)
    • Tjelmeland, H. and Omre, H. (1997). "A complex sand-shale facies model conditioned on observations from wells, seismics and production", in Baafi, E.Y. and Schofield, N.A. (eds.) Geostatistics Wollongong '96, Proceedings of the Fifth International Geostatistical Congress, Wollongong, Australia, September 22-27, 1996, Kluwer Academic Publishers. (abstract)
    • Tjelmeland, H. and Holden, L. (1992). "Semi-Markov random fields", in Soares, A. (ed.) Geostatistics Troia '92, Proceedings of the Fourth International Geostatistical Congress, Troia, Portugal, September 13-18, 1992, Kluwer Academic Publishers. (abstract)

  • Dr.ing. thesis: Tjelmeland, H. (1996) "Stochastic models in reservoir characterization and Markov random fields for compact objects", Dr.ing. thesis, 1996:44, Norwegian University of Science and Technology, Trondheim, Norway. The thesis consists of four parts:
    • Introduction (pdf)
    • Markov random fields with higher order interactions, published in SJS, see above.
    • Empirical comparison of MPLE and MLE for binary Markov random fields (pdf)
    • A Bayesian framework for integrated reservoir characterization (pdf)