Andrew Zalesky

I am currently the Melbourne Neuroscience Institute Fellow. I am based at the Melbourne Neuropsychiatry Centre, a centre in the Department of Psychiatry at the University of Melbourne. I was an ARC Fellow (APD) at the same centre from 2009-2011. In 2008 I was an ARC International Fellow.

Email:	azalesky at unimelb.edu.au
Phone:	(+613) 8344 1892
Address:	National Neuroscience Facility The University of Melbourne Level 3, Alan Gilbert Building 161 Barry Street Carlton South, VIC 3053 AUSTRALIA

Algorithms

Network-Based Statistic (NBS) - NBS is a software package designed for testing hypotheses about the human connectome. It is made freely available to the neuroimaging community under the GNU General Public Licence. NBS v1.1 was released in August 2012 and can be downloaded from the Brain Connectivity Toolbox. Thanks to Mika Rubinov and Olaf Sporns. NBS v1.1 is also available for download from NITRC. An earlier version of the NBS is available as a plugin for Connectome Viewer. Thanks to Stephan Gerhard. New features to v1.1 include:
- Graphical user interface
- Statistical design specified with general linear model. Covers most statistical designs, including t-test, F-test, ANOVA, ANCOVA, multiple linear regression, etc., and enables modeling of nuisance covariates.
- NBSview, a basic network viewer modeled on SPMresults
- Exchange blocks for repeated measures designs
- Options to measure network size with intensity or extent
- False discovery rate (FDR) option
Example applications of the NBS can be found in:
- Bai et al. (2012) J Neuro. 32(12):4307-4318.
- Verstraete et al. (2011) PLoS ONE. 6:e24239.
- Zhang et al. (2011) Biol Psychiatry. 70:334-342.

Spatial Pairwise Clustering (SPC) - SPC will be made available soon.

Random grey matter node parcellation - Matlab functions to randomly parcellate grey matter compactly or uniformly into a predefined number of nodes. Uniform parcellation ensures nodes are equal in volume. Compact parcellation ensures nodes have a low surface area to volume ratio (i.e. compact), but the volume of the largest node can be up to twice as large as the volume of the smallest node. Neither of these strategies preclude discontiguous nodes due to grey matter non-convexity.

Hirschberger-Qi-Steuer (H-Q-S) - A Matlab function implementing the H-Q-S algorithm, which generates a null correlation matrix that is matched to a given covariance matrix. The algorithm takes as input a covariance matrix and returns a null correlation matrix. The mean and variance of the off-diagonal elements (covariances) and the mean of the diagonal elements (variances) of the covariance matrix are matched. H-Q-S can be used in place of Maslov-Sneppen rewiring for normalising network measures in correlation networks.

Neuroimaging/Biostatistics/Psychiatry Papers

Effect of long-term cannabis use on axonal fibre connectivity (2012)
Zalesky A, Solowij N, Yucel M, Lubman DI, Takagi M, Harding IH, Lorenzetti V, Wang R, Searle K, Pantelis C, Seal M
Brain. 135(Pt 7):2245-2255.

Competitive and cooperative dynamics of large-scale functional brain networks supporting recollection (2012)
Fornito A, Harrison BJ, Zalesky A, Simons JS
Proc Natl Acad Sci U S A. In press.

How can connectomics advance our knowledge of psychiatric disorders? (2012)
Cocchi L, Zalesky A, Fontenelle L
Rev Bras Psiquiatr. 34(2):131-132.

Schizophrenia, neuroimaging and connectomics (2012)
Fornito A, Zalesky A, Pantelis C, Bullmore ET
NeuroImage. In press. doi: /10.1016/j.neuroimage.2011.12.090

On the use of correlation as a measure of network connectivity (2012)
Zalesky A, Fornito A, Bullmore E
NeuroImage. 60(4):2096-2106.

Connectivity differences in brain networks (2012)
Zalesky A, Cocchi L, Fornito A, Murray MM, Bullmore E
NeuroImage. 60(2):1055-1062.
Please note the typo in Algorithm 1: on line 4, t(i,j)>T should be replaced with t(x_i,y_i)>T and t(x_j,y_j)>T.

Dynamic changes in brain functional connectivity during concurrent dual-task performance (2011)
Cocchi L, Zalesky A, Toepel U, Whitford TJ, De-Lucia M, Murray MM, Carter O
PLoS ONE. 6(11):e28301.

The relationship between regional and inter-regional functional connectivity deficits in schizophrenia (2011)
Zalesky A, Fornito A, Egan GF, Pantelis C, Bullmore ET
Hum Brain Mapp. In press. doi: 10.1002/hbm.21379

General and specific functional connectivity disturbances in first episode schizophrenia during cognitive control performance (2011)
Fornito A, Yoon J, Zalesky A, Bullmore ET, Carter CS
Biol Psychiatry. 70(1):64-72.

Genetic influences on cost-efficient organization of human cortical functional networks (2011)
Fornito A, Zalesky A, Bassett D, Meunier D, Ellison-Wright I, Yucel M, Wood SJ, Shaw K, O'Connor J, Nertney D, Mowry B, Pantelis C, Bullmore ET
J. Neurosci. 31(9):3261-3270.

Disrupted axonal fiber connectivity in schizophrenia (2011)
Zalesky A, Fornito A, Seal ML, Cocchi L, Westin C-F, Bullmore ET, Egan GF, Pantelis C
Biol Psychiatry. 69(1):80-89.
(A graphic presented in this article was selected for the front cover of the issue.)

Moderating registration misalignment in voxelwise comparisons of DTI data:
A performance evaluation of skeleton projection (2010)
Zalesky A
Magn Reson Img. 29(1):111-125.

Network-based statistic: identifying differences in brain networks (2010)
Zalesky A, Fornito A, Bullmore ET
NeuroImage. 53(4):1197-1207.

White-matter abnormalities in adolescents with long-term inhalant and cannabis use: a diffusion magnetic resonance imaging study (2010)
Yucel M, Zalesky A, Takagi M, Bora E, Fornito A, Ditchfield M, Egan G, Pantelis C, Lubman D
J Psychiatr Neurosci. 35(6):409-412.

Network scaling effects in graph analytic studies of human resting-state FMRI data (2010)
Fornito A, Zalesky A, Bullmore ET
Front Syst Neurosci. 4:22.

Whole brain anatomical networks: does the choice of nodes matter? (2010)
Zalesky A, Fornito A, Harding IH, Cocchi L, Yucel M, Pantelis C, Bullmore ET
NeuroImage. 50(3):970-83.

A DTI-derived measure of cortico-cortical connectivity (2009)
Zalesky A, Fornito A
IEEE Trans Med Imaging. 28(7):1023-36.

Diffusion tensor magnetic resonance imaging (DT-MRI) fiber tracking: a shortest paths approach (2008)
Zalesky A
IEEE Trans Med Imaging. 27(10):1458-71.

Networking Papers

To burst or circuit switch? (2009)
Zalesky A
IEEE/ACM Trans Networking. 17(1):305-318.

A new method for blocking probability evaluation in OBS/OPS networks with deflection routing (2009)
Wong EWM, Baliga J, Zukerman M, Zalesky A, Raskutti G
IEEE/OSA J Lightwave Technol. 27(23):5335-5347.

A state-dependent approximation for the generalized Engset model (2009)
Wong EWM, Zalesky A, Zukerman M
IEEE Commun Lett. 13(12):962-964.

Cost comparison of optical burst switched and automatically switched optical networks (2009)
Parthiban R, Leckie C, Zalesky A, Zukerman M, Tucker RS
IEEE/OSA J Lightwave Technol. 27(13):2315-2329.

Towards a bufferless optical internet (2009)
Wong EWM, Andrew LLH, Cui T, Moran W, Zalesky A, Tucker RS, Zukerman M
IEEE/OSA J Lightwave Technol. 27(14):2817-2833.

Designing an optimal scheduler buffer in OBS networks (2008)
Zalesky A, Vu HL
IEEE/OSA J. Lightwave Technol. 26(14):2046-2054.

On generalizations of the Engset model (2007)
Wong EWM, Zalesky A, Zukerman M
IEEE Commun Lett. 11(4):360-362.

Stabilizing deflection routing in optical burst switched networks (2007)
Zalesky A, Vu HL, Rosberg Z, Zukerman M, Wong EWM
IEEE J Sel Areas Commun. 25(6):3-19.

A new method for approximating blocking probability in overflow loss networks (2007)
Wong EWM, Zalesky A, Rosberg Z, Zukerman M
Computer Networks. 51(11):2958-2975.

Enhanced blocking probability estimation in trunk reservation networks (2007)
Raskutti G, Zalesky A, Zukerman M
IEEE Commun Lett. 11(6):543-545.

OBS contention resolution performance (2007)
Zalesky A, Vu HL, Rosberg Z, Wong EWM, Zukerman M
Performance Evaluation. 64(4):357-373.

Automatic laser shutdown implications for all-optical data networks (2006)
Hinton K, Farrell P, Zalesky A, Andrew LLH, Zukerman M
IEEE/OSA J Lightwave Technol. 24(2):674-680.

Analysis of OBS networks with limited wavelength conversion (2006)
Rosberg Z, Zalesky A, Vu HL, Zukerman M
IEEE/ACM Trans Networking. 14(5):1118-1127.

Packet delay in optical circuit switched networks (2006)
Rosberg Z, Zalesky A, Zukerman M
IEEE/ACM Trans Networking 14(2):341-354.

Dynamically concatenated wavelength converters (2006)
Zalesky A, Tucker RS
IEEE/OSA Photonics Technol Lett. 18(2):352-354.

Scalable performance evaluation of a hybrid optical switch (2005)
Vu HL, Zalesky A, Wong EWM, Rosberg Z, Bilgrami SH, Zukerman M, Tucker RS
IEEE/OSA J Lightwave Technol. 23(10):2961-2973.

Prioritized deflection routing in optical burst switched networks (2005)
Cameron C, Zalesky A, Zukerman
IEICE Trans Commun. E88-B(5):1861-1867.

Reducing spare capacity through traffic splitting (2004)
Zalesky A, Vu HL, Zukerman M
IEEE Commun Lett. 8(9):594-596.

Performance analysis of an OBS edge router (2004)
Zalesky A, Wong EWM, Zukerman M, Vu HL, Tucker RS
IEEE/OSA Photonics Technol Lett. 16(2):695-697.

A framework for solving logical topology design problems within constrained computation time (2003)
Zalesky A, Vu HL, Zukerman M, Ouveysi I
IEEE Commun Lett. 7(10):499-501.

Papers in Proceedings

Engset formula for bufferless OBS/OPS: when is and when isn't lengthening the off-time redundant?
Zalesky A, Wong EWM, Zukerman M, Vu HL
in Proc IEEE Global Telecommunications Conference, GLOBECOM. Honolulu, Hawaii. November 2009.

Blocking probability evaluation and traffic management of bufferless OPS/OBS networks
Wong EWM, Baliga J, Zukerman M, Zalesky A, Raskutti G
in Proc 14th OptoElectronics and Communications Conference, OECC. Hong Kong. July 2009.

Blocking probability estimation for trunk reservation networks
Raskutti G, Zalesky A, Wong EWM, Zukerman M
in Proc IEEE International Conference on Communications, ICC. Glasgow, Scotland. June 2007. pp. 223-228.

Effect of traffic shifts on the economics of telecommunications competition
Baliga J, Zalesky A, Zukerman M
in Proc IEEE International Conference on Communications, ICC. Glasgow, Scotland. June 2007. pp. 229-234.

Optimizing an OBS scheduler buffer
Zalesky A
in Proc 1st International Conference on Performance Evaluation Methodologies and Tools, Valuetools. Pisa, Italy. October 2006.

Computing blocking in a hybrid optical switch
Zalesky A, Vu HL, Wong EWM, Zukerman M, Rosberg Z, Bilgrami SH
in Proc 19th International Teletraffic Congress, ITC. Beijing, China. August/September 2005. pp. 1385-1394.

Models and approximations for bufferless optical networks
Vu HL, Zalesky A, Rosberg Z, Zukerman M
in Proc 10th Opto-Electronics and Communications Conference, OECC. Seoul, Korea. July 2005. pp. 350-351.

A novel method for modeling and analysis of distributed video-on-demand systems
Wong EWM, Chiu MYM, Zukerman M, Rosberg Z, Chan S, Zalesky A
in Proc IEEE International Conference on Communications, ICC. Seoul, Korea. May 2005. pp. 1:88-92.

Delay analysis of optical burst switching networks
Vu HL, Zalesky A, Zukerman M, Rosberg Z, Guo J, Um TW
in Proc IEEE International Conference on Communications, ICC. Seoul, Korea. May 2005. 3:1656-1662.

Does optical burst switching have a role in the core network?
Parthiban R, Tucker RS, Leckie C, Zalesky A, Tran AV
in Proc Optical Fiber Communication Conference, OFC/NFOEC. Anaheim, California. March 2005. 3:50-52.

Comparison of OBS resolution policies
Zalesky A, Vu HL, Rosberg Z, Wong EWM, Zukerman M
in Proc International Conference on Optical Communications and Networks, ICOCN. Hong Kong, China. November 2004. pp. 99-102.

Shortest path prioritized random deflection routing in optical burst switched networks
Cameron C, Zalesky A, Zukerman M
in Proc 1st International Conference on Broadband Networks and 2nd Workshop on Optical Burst Switching, Broadnets/WOBS. San Jose, California. October 2004.

Optical burst switching - prioritized deflections
Cameron C, Zalesky A, Zukerman M
in Proc 9th Opto-Electronics and Communications Conference and 3rd International Conference on Optical Internet, OECC/COIN. Yokohama, Japan. July 2004.

IP over optical transport network: cost and scalability study
Vu HL, Tran AV, Zalesky A
in Proc 9th Opto-Electronics and Communications Conference and 3rd International Conference on Optical Internet, OECC/COIN. Yokohama, Japan. July 2004.

Laser safety issues in dynamically reconfigurable all-optical networks
Hinton K, Farrell P, Zalesky A
in Proc 9th Opto-Electronics and Communications Conference and 3rd International Conference on Optical Internet, OECC/COIN. Yokohama, Japan. July 2004.

Evaluation of limited wavelength conversion and deflection routing as methods to reduce blocking probability in optical burst switched networks
Zalesky A, Vu HL, Zukerman M, Rosberg Z, Wong EWM
in Proc IEEE International Conference on Communications, ICC. Paris, France. June 2004. pp. 3:1543-1547.

Modelling and performance evaluation of optical burst switched networks with deflection routing and wavelength reservation
Zalesky A, Vu HL, Rosberg Z, Wong EWM, Zukerman M
in Proc 23rd Joint Conference of IEEE Computer and Communications Societies, INFOCOM. Hong Kong, China. March 2004. 3:1864-1871.

Reduced load Erlang fixed point analysis of optical burst switched networks with deflection routing and wavelength reservation
Zalesky A, Vu HL, Rosberg Z, Zukerman M, Wong EWM
in Proc 1st International Workshop on Optical Burst Switching, WOBS. Dallas, Texas. October 2003.

Performance analysis of optical burst switching networks with deflection routing
Zalesky A, Vu HL, Rosberg Z, Zukerman M, Wong EWM
in Proc 2nd Conference on the Optical Internet and Australian Conference on Optical Fibre Technology, COIN/ACOFT. Melbourne, Australia. July 2003.

Routing and wavelength assignment over multi-fibre optical networks with no wavelength conversion
Zalesky A, Vu HL, Zukerman M, Leckie C, Ouveysi I
in Proc 7th IFIP Working Conference on Optical Network Design and Modelling, ONDM. Budapest, Hungary. February 2003. 3:1155-1169.

A lifetime quantification tool for WDM networks
Maxemchuk N, Shum T, Zalesky A, Zukerman M
in Proc Workshop on Optical Networking: Technologies, Architectures and Management. Melbourne, Australia. November 2001.

Miscellaneous Images

NBS versus SPC.
Taken from Zalesky et al. (2012) NeuroImage.

Reduced functional connectivity in schizophrenia identified with the NBS.
Taken from Zalesky et al. (2010) NeuroImage.

Reduced anatomical connectivity in schizophrenia identified with the NBS.
Taken from Zalesky et al. (2011) Biol Psychiatry

Projection of the white-matter skeleton.
Taken from Zalesky (2010) Magn Reson Img.

To burst or circuit switch?
Taken from Zalesky (2009) IEEE/ACM Trans Network.

The overflow priority classification approximation (OPCA).

A termination of the infinite regress.
Image taken from Paul Davies' book, Cosmic Jackpot (2007).

This page was last updated February 2012.