Ali Özer Ercan's Home Page

Ali Özer Ercan
Post-doctoral Researcher
Berkeley Wireless Research Center
2108 Allston Way, Suite 200
94704-1302, Berkeley, CA, USA
e-mail: my e-mail in gif

My Resume (Updated March 12, 2009)

Publications

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A. O. Ercan, J. Lee, S. Pollin and J. M. Rabaey, "A Revenue Enhancing Stackelberg Game for Owners in Opportunistic Spectrum Access", in Proceedings of IEEE DySPAN'08, October 2008.
A. O. Ercan, A. El Gamal and L. J. Guibas, "Object Tracking in the Presence of Occlusions via a Camera Network", in Proceedings of IPSN'07, April 2007.
A. O. Ercan, A. El Gamal and L. J. Guibas, "Camera Network Node Selection for Target Localization in the Presence of Occlusions", in SENSYS-DSC'06, October 2006.
A. O. Ercan, D. B. Yang, A. El Gamal and L. J. Guibas, "Optimal Placement and Selection of Camera Network Nodes for Target Localization", in Proceedings of DCOSS'06, LNCS 4026, pp. 389-404, June 2006.
D. B. Yang, J. Shin, A. O. Ercan and L. J. Guibas, "Sensor Tasking for Occupancy Reasoning in a Network of Cameras", in BASENETS'04, October 2004.
A. O. Ercan, F. Xiao, X. Q. Liu, S. H. Lim, A. El Gamal and B. Wandell, "Experimental High Speed CMOS Image Sensor System and Applications", in Proceedings of IEEE Sensors Conference, pp. 15-20, June 2002.

BibTeX entries for these publications can be found here

GLPKMEX with 2 Fixes

GLPK (GNU Linear Programming Kit) is an open source linear and mixed integer programming software. GLPKMEX is a MATLAB mex interface to GLPK. It seems like the version downloadable from the GLPKMEX web site doesn't compile with the latest version of GLPK (which was 4.33 at the time of writing this).

Another bug I found with GLPKMEX is as follows: if you set a variable an upper or lower bound and then set it to be of type binary, GLPK automatically overwrites previously set upper or lower bounds and sets them to be 1 and 0 respectively. If you are coding in C using GLPK, then you have to make sure to set the bounds after setting the variable type. This is not followed in the GLPKMEX code. (Of course, I am assuming you are not setting a lower bound < 0 or an upper bound > 1 for a binary variable. Setting a lower bound > 0 or an upper bound < 1 is equivalent to fixing that binary variable to 1 or 0, respectively. However, this is a valid operation and should not result in an infeasible solution. This is the case when the current implementation of GLPKMEX fails)

I fixed the first compilation problem by replacing glp_ulong with xlong_t, and I added a few lines to GLPKMEX code to get around the upper/lower bound problem. You can download the full GLPKMEX tarball with these 2 fixes here. Note that I publish this modified GLPKMEX code absolutely without any warranty under the terms of GNU General Public License, a copy of which should come with it.

Updated March 12, 2009

Ali Ozer Ercan, Ali Ercan, Ozer Ercan
CMOS Image Sensor, High Speed Imager, High Frame Rate
Wireless Sensor Network, Camera Network, Sensor Selection, Sensor Placement, Camera Selection, Camera Placement
Kadikoy Anadolu Lisesi, Bilkent University, Stanford University
UC Berkeley, BWRC, Berkeley Wireless Research Center
Cognitive Radio, Spectrum Utilization, Home Gateway, Connectivity Broker